CN202385049U - Pulse width modulation (PWM) driving speed governing circuit for speed regulating and control of alternating current motor of household appliances - Google Patents
Pulse width modulation (PWM) driving speed governing circuit for speed regulating and control of alternating current motor of household appliances Download PDFInfo
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- CN202385049U CN202385049U CN201120563786XU CN201120563786U CN202385049U CN 202385049 U CN202385049 U CN 202385049U CN 201120563786X U CN201120563786X U CN 201120563786XU CN 201120563786 U CN201120563786 U CN 201120563786U CN 202385049 U CN202385049 U CN 202385049U
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Abstract
The utility model discloses a PWM driving speed governing circuit for speed regulating and control of an alternating current asynchronous motor of household appliances. At present, the common variable frequency speed regulating system is a thyristor chopped wave speed regulating system in the field, but problems of vibration and loading capacity at a low speed and the like of a thyristor speed regulating motor need to be solved urgently. The technical scheme includes that the PWM driving speed governing circuit for speed regulating and control of the alternating current asynchronous motor of household appliances comprises the alternating current asynchronous motor, and is characterized in that the alternating current asynchronous motor is connected in series with a drive circuit and connected in parallel with a motor follow current circuit, the on and off of the motor follow current circuit are opposite to those of the drive circuit, and each of the circuits is provided with a PWM signal input end. The PWM driving speed governing circuit for speed regulating and control of the alternating current asynchronous motor of household appliances solves the problems of the vibration and loading capacity at the low speed of the thyristor speed regulating motor, and more accurate speed control can be achieved with low cost simultaneously.
Description
Technical field
The utility model relates to the speed regulating control of AC induction motor, and specifically a kind of PWM of household electrical appliance AC induction motor speed regulating control that is applicable to drives alignment circuit.
Background technology
Alternating current machine advantage simple in structure, easily manufactured, reliable with it, that can run up, can under adverse circumstances, move has obtained using widely; But because alternating current machine is the multivariable complication system of a high-order, non-linear, close coupling; Realize relatively difficulty of speed regulating control, so, for a long time; In electric machine speed regulation control field is to adopt the direct current machine drive system mostly; Its speed adjusting performance and torque control characteristic are more satisfactory, can obtain good dynamic response, yet because direct current machine structurally exists mechanical commutator and brush; Make it have the inherent defect that some are difficult to overcome, as: cost is higher, difficult in maintenance, the life-span is short, single-machine capacity and installed capacity receive certain restriction or the like.
Since the seventies in 20th century, along with the development of modern electronic technology, computer technology and control theory, promoted the development of speed regualtion of AC motor technology greatly, wherein with fastest developing speed is exactly variable-frequency control technique.Frequency conversion speed-adjusting system is the AC speed regulating drive system that ac-dc-ac inverter device and alternating current motor constitute, and has been widely used in a plurality of fields such as industry, communications and transportation, household electrical appliance now.Along with the progress of ac-dc-ac inverter device, ac speed control technology is being obtained significant progress during the decade, and its performance improves constantly, and has overcome the shortcoming of DC Transmission preferably, so its application has progressively replaced traditional dc drive system.
Industry frequency conversion speed-adjusting system commonly used is a controllable silicon chopping regulating speed system at present; Controllable silicon chopping regulating speed system has advantages such as efficient height, cost is low, power factor is high, harmonic component is little; Yet since country requires 3C and the consumer to the raising of the performance requirement of family expenses buncher, problems such as shake and the weathering zone load capacity difference of thyristor speed control motor under low speed need to be resolved hurrily.
The utility model content
The utility model technical problem to be solved is to overcome the defective that above-mentioned prior art exists; Provide a kind of PWM that is used for household electrical appliance AC induction motor speed regulating control to drive alignment circuit; To solve the existing shake of thyristor speed control motor under low speed and the problem of weathering zone load capacity difference, can realize accurate more speed control by enough lower costs simultaneously.
For this reason, the utility model adopts following technical scheme: the PWM that is used for the control of household electrical appliance speed regualtion of AC motor drives alignment circuit, comprises AC induction motor; It is characterized in that described AC induction motor is connected with one drive circuit, a parallelly connected motor freewheeling circuit; Cut-offfing of motor freewheeling circuit is opposite with cut-offfing of drive circuit; When being the drive circuit conducting, the motor freewheeling circuit breaks off, when drive circuit breaks off; The conducting of motor freewheeling circuit, two above-mentioned circuit all have a pwm signal input.
The utility model is realized the smooth change of electric current through setting up the induced current loop, prevents that sudden change from appearring in electric current, causes the motor misoperation.Key point in the utility model is when processing continues current problems, to have abandoned traditional electric capacity afterflow method; Use the IGBT loop method instead; Solve the carrier-in-interference problem, take measures to have solved the 3C problem that present controllable silicon chopping regulating speed causes from hardware simultaneously to reduce pollution to the electrical network generation.
As preferably; Described drive circuit and motor freewheeling circuit are in series by diode rectifier bridge, power tube, current-limiting resistance and triode successively; The emitter of triode connects a power supply; The base stage of triode connects a resistance, and the other end of this resistance forms described pwm signal input, and pwm signal is from this input input.
As preferably, the ON time of motor freewheeling circuit is shorter than the ON time of drive circuit, to prevent causing short circuit because of Dead Time causes two direct conductings of power tube, burns power tube.
The utility model relatively is suitable for the motor speed control in the present household electrical appliance; It has not only solved the shake of present thyristor speed control motor under low speed and the problem of weathering zone load capacity difference, has good cost advantage simultaneously, the enough lower costs of ability; Realize accurate more speed control; And reduced the noise of motor, can also export adjusting according to the tach signal of feedback, with stabilized (steady-state) speed.
Below in conjunction with Figure of description and embodiment the utility model is described further.
Description of drawings
Fig. 1 is the schematic diagram of the utility model.
Embodiment
Be drive circuit in Fig. 1 frame of broken lines, this circuit and AC induction motor are series relationship, when circuit turn-on, are added in the alternating current conducting on the AC induction motor, are equivalent to closing of circuit, the AC induction motor running.Because the unidirectional conducting of power tube, so power tube IGBT devices switch loop has increased diode guiding circuit.
The concrete operating state of drive circuit is following: when input PWM1 signal is " 1 ", and triode Q1, power tube Q2 conducting, voltage is added on the AC induction motor, AC induction motor energising rotation.Along with the continuous variation of PWM1 pulse signal, the switch off time of power tube Q2 constantly changes, and the voltage that is added on the AC induction motor also changes thereupon.
Dotted line is the motor freewheeling circuit with top, and this circuit and drive circuit are identical, and only it is parallelly connected relation with AC induction motor, and cut-offs just in time on the contrary with cut-offfing of drive circuit, i.e. during drive circuit conducting, this circuit breaks off; When drive circuit breaks off; This circuit turn-on, but consider the Dead Time that power tube cut-offs in the circuit, and the ON time of freewheeling circuit is smaller than the ON time of drive circuit; To prevent causing short circuit, burn power tube because of Dead Time causes two direct conductings of power tube.Wherein motor, rectifier bridge and power tube form motor induced current loop.
The concrete operating state of motor freewheeling circuit is following: when input PWM2 signal is " 1 ", and triode Q3 conducting, the loop conducting of motor induced current realizes the afterflow of motor.Along with the continuous variation of PWM2 pulse signal, the switch off time of power tube Q4 constantly changes, and the intensity of motor freewheel current also changes thereupon.
Claims (3)
1. the PWM that is used for the control of household electrical appliance speed regualtion of AC motor drives alignment circuit; Comprise AC induction motor; It is characterized in that described AC induction motor is connected with one drive circuit, a parallelly connected motor freewheeling circuit; Cut-offfing of motor freewheeling circuit is opposite with cut-offfing of drive circuit, and two above-mentioned circuit all have a pwm signal input.
2. the PWM that is used for the control of household electrical appliance speed regualtion of AC motor according to claim 1 drives alignment circuit; It is characterized in that; Described drive circuit and motor freewheeling circuit are in series by diode rectifier bridge, power tube, current-limiting resistance and triode successively; The emitter of triode connects a power supply, and the base stage of triode connects a resistance, and the other end of this resistance forms described pwm signal input.
3. the PWM that is used for the control of household electrical appliance speed regualtion of AC motor according to claim 1 and 2 drives alignment circuit, it is characterized in that the ON time of motor freewheeling circuit is shorter than the ON time of drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120563786XU CN202385049U (en) | 2011-12-29 | 2011-12-29 | Pulse width modulation (PWM) driving speed governing circuit for speed regulating and control of alternating current motor of household appliances |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120563786XU CN202385049U (en) | 2011-12-29 | 2011-12-29 | Pulse width modulation (PWM) driving speed governing circuit for speed regulating and control of alternating current motor of household appliances |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202385049U true CN202385049U (en) | 2012-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120563786XU Expired - Fee Related CN202385049U (en) | 2011-12-29 | 2011-12-29 | Pulse width modulation (PWM) driving speed governing circuit for speed regulating and control of alternating current motor of household appliances |
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| CN (1) | CN202385049U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208893A (en) * | 2016-09-29 | 2016-12-07 | 广东美的环境电器制造有限公司 | The speed drive circuit of motor and fan electromotor |
| WO2018171003A1 (en) * | 2017-03-23 | 2018-09-27 | 广东美的制冷设备有限公司 | Alternating-current (ac) motor speed regulating circuit and air conditioner |
-
2011
- 2011-12-29 CN CN201120563786XU patent/CN202385049U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208893A (en) * | 2016-09-29 | 2016-12-07 | 广东美的环境电器制造有限公司 | The speed drive circuit of motor and fan electromotor |
| CN106208893B (en) * | 2016-09-29 | 2020-01-10 | 广东美的环境电器制造有限公司 | Speed regulation driving circuit of motor and fan motor |
| WO2018171003A1 (en) * | 2017-03-23 | 2018-09-27 | 广东美的制冷设备有限公司 | Alternating-current (ac) motor speed regulating circuit and air conditioner |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120815 Termination date: 20141229 |
|
| EXPY | Termination of patent right or utility model |