CN1297065C - A brushless DC motor - Google Patents
A brushless DC motor Download PDFInfo
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- CN1297065C CN1297065C CNB031374964A CN03137496A CN1297065C CN 1297065 C CN1297065 C CN 1297065C CN B031374964 A CNB031374964 A CN B031374964A CN 03137496 A CN03137496 A CN 03137496A CN 1297065 C CN1297065 C CN 1297065C
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Abstract
The present invention relates to a brushless DC motor controlled by an AC power supply, which comprises a converting circuit and a DC motor drive return circuit, wherein the converting circuit comprises a rectification unit, a surging absorption unit, a filtration unit, a voltage stabilization control unit and a voltage stabilization unit. The rectification unit, the surging absorption unit and the filtration unit are connected in series between an AC power supply and the DC motor drive return circuit. Thus, rectification and absorption of surging and filtration are carried out by the AC power supply, and are supplied to the DC motor drive return circuit. The voltage stabilization control unit and voltage stabilization unit are connected in series between the rectification unit and DC motor drive return circuit, so the DC motor drive return circuit allows passing by a low voltage and prevents the passing by of a high voltage. Thus, the DC motor drive return circuit is moved under the control of the voltage stabilization control unit and the voltage stabilization unit.
Description
Technical field
The invention relates to a kind of Brushless DC motor, it is particularly to the Brushless DC motor with AC power control.
Background technology
As shown in Figure 1, give people's such as Horgn No. the 6278248th, United States Patent (USP) " the Brushless DC motor fan that the tool AC power drives " August 21 calendar year 2001, it discloses a change-over circuit (converter circuit) 1 and comprises a bridge rectifier (bridge rectifier) 11, one resistor (resistor) 12 and a filter (filter) 13.This resistor 12 is in order to the pressure drop AC power, so that the AC power that is applicable to Brushless DC motor to be provided.This change-over circuit 1 nationality converts AC power to DC power supply by this bridge rectifier 11, and with direct current power supply to a motor drive circuit 2 and a sensing element 20, so can make this Brushless DC motor fan be applicable to AC power, and unnecessaryly limit this Brushless DC motor this must be used in DC power supply.
Yet the resistor 12 of this change-over circuit 1 converts general AC mains source to be applicable to the small-sized brushless d.c. motor low-voltage alternating current power supply when carrying out pressure drop, for example the AC110V pressure drop to AC12V or AC220V pressure drop to AC24V.At this moment, this resistor 12 can continue to produce heat energy because of power consumption, so this Brushless DC motor fan certainly leads to temperature rise even overheated phenomenon when running well.
In addition, in case this Brushless DC motor fan is stuck, pin or running when having some setbacks, causes uprushing, thereby increase the power consumption of this resistor 12 by the electric current of this resistor 12.If when this resistor 12 consumes electric energy excessively, may cause this resistor 12 and other motor component to burn.
Please refer to shown in Figure 2ly, United States Patent (USP) discloses a change-over circuit 1 ' No. 6278248 in addition, comprises a capacitor group 14, a resistor group 15 and a voltage stabilizing didoe 16.This resistor group 15 has power consumption and produces the problem of heat energy.Same, this capacitor group 14 is to use as filtering also can produce superheating phenomenon.
In view of this, the present invention improves above-mentioned shortcoming, utilizes a rectification unit to carry out rectification one AC power, utilizes a voltage stabilizing control unit and a voltage regulation unit to carry out voltage stabilizing control again, promptly simply finishes a Brushless DC motor that can use AC power.
Summary of the invention
Main purpose of the present invention provides a kind of Brushless DC motor of tool AC power control, it utilizes a rectification unit to carry out rectification one AC power, utilizing a voltage stabilizing control unit and a voltage regulation unit to control DC power supply after this rectification again makes this DC power supply form that high pressure is blocked and low pressure can be passed through, so that the driving loop use of a galvanic current source for motor to be provided, make the present invention have low-loss and prolong the motor effect in useful life.
Secondary objective of the present invention provides the Brushless DC motor of a kind of tool AC power control, and it utilizes a rectification unit connect a surging absorptive unit and a filter unit, to protect a direct current motor driving loop, makes the present invention have the effect of protection motor component.
Technical scheme of the present invention is achieved in that
A kind of Brushless DC motor, it is characterized in that, it has a change-over circuit and a motor driving loop, this change-over circuit comprises: a rectification unit, and it connects an AC power so that this rectification unit converts AC power to DC power supply that supply is applicable to the motor driving loop of this Brushless DC motor:
A voltage stabilizing control unit, it is connected between this rectification unit and the motor driving loop, and in order to detect whether the direct voltage that is supplied to this motor driving loop by this rectification unit is a DC low-voltage that is applicable to this Brushless DC motor; And voltage regulation unit, it is connected between this voltage stabilizing control unit and the motor driving loop, this voltage stabilizing control unit is controlled this voltage regulation unit, in case so that the direct voltage that this voltage stabilizing control unit detects this rectification unit supply is when meeting this DC low-voltage, this voltage regulation unit provides a galvanic current to be depressed into this motor driving loop; Nationality is controlled this voltage regulation unit by the DC power supply of rectification unit output through this voltage stabilizing control unit, with conducting or close this motor driving loop, when detecting a High Level DC Voltage, this voltage stabilizing control unit then cuts off the direct voltage that is supplied to this motor driving loop.
Wherein this rectification unit is a bridge rectifier.
Wherein comprise a surging absorptive unit in addition, it is connected between this rectification unit and this motor driving loop.
Wherein this surging absorptive unit is a rheostat.
Wherein comprise a filter unit in addition, it is connected between this rectification unit and this motor driving loop.
Wherein this filter unit is a capacitor.
Wherein this voltage stabilizing control unit comprises an OP operational amplifier, a diode, first resistor, second resistor, the 3rd resistor, first capacitor, the 4th resistor and one second capacitor; The positive input terminal of this OP operational amplifier is connected to this diode, first resistor, the 3rd resistor and first capacitor; And the negative input end of this OP operational amplifier is connected to this second resistor, the 4th resistor and second capacitor.
Wherein the positive input terminal of this OP operational amplifier is connected to this diode, first resistor, the 3rd resistor and first capacitor, by this diode, first resistor, the 3rd resistor and first capacitor jointly in order to provide a time-schedule float reference voltage Vref to this OP operational amplifier.
Wherein this voltage regulation unit is a metal oxide semiconductor field effect tube.
According to the Brushless DC motor of tool AC power control of the present invention, this Brushless DC motor comprises a change-over circuit and a direct current motor driving loop.This change-over circuit comprises a rectification unit, a surging absorptive unit, a filter unit, a voltage stabilizing control unit and a voltage regulation unit.This rectification unit, surging absorptive unit, filter unit are series at an AC power and this d.c. motor drives between the loop, so that this AC power is carried out rectification, absorbed surging and filtering, and is supplied to this d.c. motor driving loop.This voltage stabilizing control unit and voltage regulation unit are series at this rectification unit in addition and d.c. motor drives between the road, so that this d.c. motor drive allow on loop low pressure by and prevent that high pressure from passing through, make this d.c. motor drive road and under the control of this voltage stabilizing control unit and voltage regulation unit, move.
Description of drawings
Fig. 1 is the circuit diagram of the change-over circuit of No. 6278248 Brushless DC motor fan of United States Patent (USP)
Fig. 2 is the circuit diagram of another change-over circuit of No. 6278248 Brushless DC motor fan of United States Patent (USP)
Fig. 3 drives the process block diagram in loop for the Brushless DC motor of preferred embodiment tool AC power control of the present invention
Fig. 4 is the circuit diagram of the Brushless DC motor of the Brushless DC motor of preferred embodiment tool AC power control of the present invention
Embodiment
As shown in Figure 3, be the process block diagram of the Brushless DC motor of preferred embodiment tool AC power of the present invention control.The Brushless DC motor of preferred embodiment tool AC power control of the present invention comprises a change-over circuit 3 and a direct current motor driving loop 4.This change-over circuit 3 is serially connected with an AC power AC and this d.c. motor drives
Asking of loop 4 converts AC power AC to the DC power supply that is applicable to Brushless DC motor, for example 12V.This change-over circuit 3 comprises a rectification unit 31, a surging absorptive unit 32, a filter unit 33, a voltage stabilizing control unit 34 and a voltage regulation unit 35
Referring again to shown in Figure 3, this rectification unit 31, surging absorptive unit 32, filter unit 33 are series at AC power and this d.c. motor drives between the loop 4, so that this AC power is carried out rectification, absorbed surging and filtering, and be supplied to this d.c. motor driving loop 4.
Please refer to Fig. 3 and shown in Figure 4, this rectification unit 31 has an input and an output, and this input is connected to this AC power, and this output then is connected to this surging absorptive unit 32.This rectification unit 31 converts AC power to DC power supply, and is supplied to this d.c. motor and drives loop 4.This rectification unit 31 is preferably bridge rectifier or diode element etc.
Referring again to Fig. 3 and shown in Figure 4, this surging absorptive unit 32 is connected between this rectification unit 31 and the filter unit 33, and it destroys motor component in order to absorb the surging that this AC power produces to prevent surging.
This surging absorptive unit 32 is preferably rheostat (varistor), and it has the interdependent nonlinear resistance of voltage, and increases and the remarkable bipolar semiconductor element (dipolesemiconductor device) that descends with applying voltage.
Referring again to Fig. 3 and shown in Figure 4, this filter unit 33 is to be connected between this surging absorptive unit 32 and the d.c. motor driving loop 4.This filter unit 33 is preferably capacitor so that with power filter.This rectification unit 31 exports DC power supply to this surging absorptive unit 32 and filter unit 33, and supply one burning voltage was to this DC driven motor loop 4 after this filter unit 32 carried out filtering with DC power supply.
Referring again to Fig. 3 and shown in Figure 4.This voltage stabilizing control unit 34 and voltage regulation unit 35 are series in addition between this rectification unit 31 and the d.c. motor driving loop 4 and press this d.c. motor driving loop 4 of supply so that the DC power supply of reception after rectification unit 31 rectifications carried out voltage stabilizing control to form a galvanic current, and so turn round under the control of this voltage stabilizing control unit 34 and voltage regulation unit 35 in this d.c. motor driving loop 4.This voltage stabilizing control unit 34 comprises an OP operational amplifier 341, a diode 342, one first resistor 343, one second resistor 344, one the 3rd resistor 345, one first capacitor 346, one the 4th resistor 347 and one second capacitor 348.This OP operational amplifier 341 has a positive input terminal, a negative input end and an output, the positive input terminal of this OP3 operational amplifier 341 is connected to diode 342, first resistor 343, the 3rd resistor 345 and first capacitor 346, by this diode 342, first resistor 343, the 3rd resistor 345 and first capacitor 346, jointly in order to provide a time-schedule float reference voltage Vref to this positive input terminal.The negative input end of this OP operational amplifier 341 is connected to this second resistor 344, the 4th resistor 347 and second capacitor 348, and direct voltage Vcc is inputed to this negative input end.The output of this OP operational amplifier 341 is connected to this voltage regulation unit 35.At this moment, this OP operational amplifier 341 compares this direct voltage Vcc and time-schedule float reference voltage Vref, and exports comparative result to this voltage regulation unit 35, controls this voltage regulation unit 35 by this.
When this direct voltage Vcc is lower than the time-schedule float reference voltage Vref, this this voltage regulation unit 35 of voltage stabilizing control unit 34 conductings, drive loop 4 to allow low-voltage to pass through this d.c. motor, so this d.c. motor driving loop 4 only need be provided with low withstand voltage, low power element.
When this direct voltage Vcc is higher than the time-schedule float reference voltage Vref; this voltage stabilizing control unit 34 cuts off this voltage regulation unit 35; do not allow high-voltage large current to pass through this d.c. motor and drive loop 4, drive low withstand voltage, the low power element in loop 4 to protect this d.c. motor.Because no big electric current passes through, have and to use that height is withstand voltage, the advantage of high-power components so this d.c. motor drives loop 4.
Referring again to Fig. 3 and shown in Figure 4, this voltage regulation unit is preferably metal oxide semiconductor field effect tube (MOSFET).This voltage regulation unit 35 is connected in this voltage stabilizing control unit 34 and d.c. motor drives between the loop 4, but its nationality is controlled by the output of this voltage stabilizing control unit 34, drive loop 4 so that only allow low pressure to pass through this d.c. motor, block high pressure simultaneously and drive loop 4 by this d.c. motor.
Referring again to Fig. 3 and shown in Figure 4, this d.c. motor drives loop 4 and comprises a driving element 41, one first coil 42, one second coil 43, one first switch 44 and a second switch 45.This driving element 41 is alternately controlled this first switch 44 and second switch 45 according to the Hall signal, with this first coil 42 of alternate conduction and second coil 43.
Please refer to shown in Figure 4, the circuit diagram of Brushless DC motor that has the brushless direct-current CD-ROM drive motor of AC power control for preferred embodiment of the present invention.When this Brushless DC motor running, the electric current of AC power is through rectification, current stabilization and the filtering of this rectification unit 31, surging absorptive unit 32, filter unit 33, and export this d.c. motor to and drive loop 4, relatively this direct voltage Vcc and time-schedule float reference voltage Vref of 34 of this voltage stabilizing control units simultaneously.
When this direct voltage Vcc is lower than the time-schedule float reference voltage Vref, this voltage regulation unit 35 of output conducting of the OP operational amplifier 341 of this voltage stabilizing control unit 34.At this moment, the direct voltage of this rectification unit 31 drives driving element 41 these first switches 44 of control in loop 4 and the alternate conduction of second switch 45 through this d.c. motor, so alternately carry out excitatoryly carrying out voltage stabilizing by this voltage regulation unit 35 again through this first coil 42 and second coil 43, promptly allow low pressure by and block high pressure and pass through.
Referring again to shown in Figure 4, change-over circuit 3 of the present invention carries out voltage stabilizing control by this voltage stabilizing control unit 34 and voltage regulation unit 35, drives loop 4 to protect this d.c. motor.When DC voltage rising, this voltage stabilizing control unit 34 and voltage regulation unit 35 are closed immediately, drive loop 4 with the big electric current that stops AC power by this d.c. motor.
Above-mentioned preferred embodiment of the present invention is not that protection scope of the present invention is as the criterion with claims in order to qualification the present invention.
Claims (9)
1. a Brushless DC motor is characterized in that, it has a change-over circuit and a motor driving loop, and this change-over circuit comprises:
A rectification unit, it connects an AC power so that this rectification unit converts AC power to DC power supply that supply is applicable to the motor driving loop of this Brushless DC motor;
A voltage stabilizing control unit, it is connected between this rectification unit and the motor driving loop, and in order to detect whether the direct voltage that is supplied to this motor driving loop by this rectification unit is a DC low-voltage that is applicable to this Brushless DC motor; And
A voltage regulation unit, it is connected between this voltage stabilizing control unit and the motor driving loop, this voltage stabilizing control unit is controlled this voltage regulation unit, in case so that the direct voltage that this voltage stabilizing control unit detects this rectification unit supply is when meeting this DC low-voltage, this voltage regulation unit provides a galvanic current to be depressed into this motor driving loop;
Nationality is controlled this voltage regulation unit by the DC power supply of rectification unit output through this voltage stabilizing control unit, with conducting or close this motor driving loop, when detecting a High Level DC Voltage, this voltage stabilizing control unit then cuts off the direct voltage that is supplied to this motor driving loop.
2. Brushless DC motor as claimed in claim 1 is characterized in that, wherein this rectification unit is a bridge rectifier.
3. Brushless DC motor as claimed in claim 1 is characterized in that, wherein comprises a surging absorptive unit in addition, and it is connected between this rectification unit and this motor driving loop.
4. Brushless DC motor as claimed in claim 3 is characterized in that, wherein this surging absorptive unit is a rheostat.
5. Brushless DC motor as claimed in claim 1 is characterized in that, wherein comprises a filter unit in addition, and it is connected between this rectification unit and this motor driving loop.
6. Brushless DC motor as claimed in claim 5 is characterized in that, wherein this filter unit is a capacitor.
7. Brushless DC motor as claimed in claim 1, it is characterized in that wherein this voltage stabilizing control unit comprises an OP operational amplifier, a diode, first resistor, second resistor, the 3rd resistor, first capacitor, the 4th resistor and one second capacitor; The positive input terminal of this 0P operational amplifier is connected to this diode, first resistor, the 3rd resistor and first capacitor; And the negative input end of this OP operational amplifier is connected to this second resistor, the 4th resistor and second capacitor.
8. Brushless DC motor as claimed in claim 7, it is characterized in that, wherein the positive input terminal of this OP operational amplifier is connected to this diode, first resistor, the 3rd resistor and first capacitor, by this diode, first resistor, the 3rd resistor and first capacitor jointly in order to provide a time-schedule float reference voltage Vref to this OP operational amplifier.
9. Brushless DC motor as claimed in claim 1 is characterized in that, wherein this voltage regulation unit is a metal oxide semiconductor field effect tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031374964A CN1297065C (en) | 2003-06-25 | 2003-06-25 | A brushless DC motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031374964A CN1297065C (en) | 2003-06-25 | 2003-06-25 | A brushless DC motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1567697A CN1567697A (en) | 2005-01-19 |
| CN1297065C true CN1297065C (en) | 2007-01-24 |
Family
ID=34470441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031374964A Expired - Lifetime CN1297065C (en) | 2003-06-25 | 2003-06-25 | A brushless DC motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1297065C (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4494057A (en) * | 1981-12-05 | 1985-01-15 | Kabushiki Kaisha Morita Seisakusho | Speed control system for small medical motors |
| CN85201324U (en) * | 1985-04-19 | 1986-06-25 | 重庆第二电器厂 | Adjustable a.c. constac |
| US5604387A (en) * | 1990-12-19 | 1997-02-18 | Fisher & Paykel Limited | Power supply derived from motor winding |
| US5821709A (en) * | 1995-06-07 | 1998-10-13 | Omron Corporation | DC motor control circuit |
| JP2000236684A (en) * | 1999-02-16 | 2000-08-29 | Sanyo Electric Co Ltd | Drive circuit for motor |
-
2003
- 2003-06-25 CN CNB031374964A patent/CN1297065C/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4494057A (en) * | 1981-12-05 | 1985-01-15 | Kabushiki Kaisha Morita Seisakusho | Speed control system for small medical motors |
| CN85201324U (en) * | 1985-04-19 | 1986-06-25 | 重庆第二电器厂 | Adjustable a.c. constac |
| US5604387A (en) * | 1990-12-19 | 1997-02-18 | Fisher & Paykel Limited | Power supply derived from motor winding |
| US5821709A (en) * | 1995-06-07 | 1998-10-13 | Omron Corporation | DC motor control circuit |
| JP2000236684A (en) * | 1999-02-16 | 2000-08-29 | Sanyo Electric Co Ltd | Drive circuit for motor |
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| Publication number | Publication date |
|---|---|
| CN1567697A (en) | 2005-01-19 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C14 | Grant of patent or utility model | ||
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| CP02 | Change in the address of a patent holder |
Address after: The new Taiwan China Ya Lu Kaohsiung City No. 30 Lane 296 Patentee after: Sunonwealth Electric Machine Industry Co.,Ltd. Address before: Kaohsiung City, Taiwan, China Patentee before: Sunonwealth Electric Machine Industry Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20070124 |
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| CX01 | Expiry of patent term |