CN105680418B - A kind of load motor protection circuit, fan and air-conditioning - Google Patents
A kind of load motor protection circuit, fan and air-conditioning Download PDFInfo
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- CN105680418B CN105680418B CN201610203435.5A CN201610203435A CN105680418B CN 105680418 B CN105680418 B CN 105680418B CN 201610203435 A CN201610203435 A CN 201610203435A CN 105680418 B CN105680418 B CN 105680418B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
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Abstract
The present invention relates to a kind of load motor protection circuit, fan and air-conditionings.Wherein circuit includes alternating current generator or its major-minor winding, main switch circuit, bleed-off circuit and pulse signal generating circuit；Alternating current generator or its major-minor winding and main switch circuit in series are between the zero curve and firewire of alternating current, bleed-off circuit and alternating current generator or its major-minor winding parallel；Main switch circuit or bleed-off circuit include the first rectification circuit, the first electronic DC switch and wave filtering circuit.The present invention can solve in AC speed regulating circuit, the electronic DC switch dead time of electronic DC switch and main switch circuit in bleed-off circuit is very in short-term, when occurring interfering in circuit or when circuit abnormality, there is of short duration short circuit and causes larger dash current in the electronic DC switch of electronic DC switch and main switch circuit in bleed-off circuit, the problem of making electronic DC switch seriously overheat, even being burnt into unstable state.
Description
Technical field
The present invention relates to a kind of motor field more particularly to load motor protection circuit, fan and air-conditionings.
Background technology
Motor speed control circuit has a kind of form as shown in Figure 1, its basic principle is at present：Pass through " single phase ac electric switch
Circuit " PWM modulation carries out high-speed switch to the voltage at motor both ends, so as to the average voltage at regulation motor both ends, is adjusted to reach
The purpose of speed.When " motor inductance current bleed-off circuit " is switching circuit, it can be reduced to schematic diagram as shown in Figure 2,
Wherein K1 indicates " motor inductance current leadage circuit " in Fig. 1, and K2 indicates " single phase ac electric switch circuit " in Fig. 1,
The time control schematic diagram of Fig. 2 is as shown in figure 3, at this point, this alignment circuit has the following defects：
1) when the switching dead time between K1 and K2 (i.e.：K1 closes the time opened to K2 and K2 closes the time opened to K1)
It is the feedback voltage after the disconnection according to K2 to control the switch of K1, advantage is that the backward voltage at motor both ends is very low, disadvantage
It is that dead time is too short, and is less susceptible to control, if the time response difference caused by the property difference of device, may cause
There is temporary short circuit in K1 and K2, K1 and K2 temperature is caused to increase, or even burn-up.
If 2) using symmetrical PWM self-locking mode activated K1, K2, dead time will usually accomplish 1-2uS, such alternating current
The back-pressure of machine can be very high, it usually needs is absorbed in the capacitance C and resistance R of one large capacity of motor both ends parallel connection, referred to as RC
Absorption circuit, in RC absorption circuits, capacitance C too conferences cause the calorific value of resistance R high, and loss increases, and is unfavorable for circuit
Reliable and stable work, while required volume is also big, is unfavorable for the miniaturization of circuit.If reducing dead time to 0.1-
1uS, is possible to when interfere when K1 and K2 occur temporary short circuit occur, and burns K1 and K2.
Invention content
The technical problem to be solved by the present invention is in view of the deficiencies of the prior art, provide a kind of load motor protection
Circuit, fan and air-conditioning.
The first technical solution that the present invention solves above-mentioned technical problem is as follows：A kind of load motor protection circuit,
Including alternating current generator or its major-minor winding, main switch circuit, bleed-off circuit and pulse signal generating circuit；
The alternating current generator or its major-minor winding and the main switch circuit in series between the zero curve and firewire of alternating current,
The bleed-off circuit and the alternating current generator or its major-minor winding parallel；
The main switch circuit or the bleed-off circuit include the first rectification circuit, the first electronic DC switch and sampling filter
Wave circuit, the cathode output end of first rectification circuit are connect with the first end of first electronic DC switch, and described
The cathode output end of one rectification circuit is connect by the wave filtering circuit with the second end of first electronic DC switch,
The driving end of first electronic DC switch is connect with the pulse signal output end of the pulse signal generating circuit；It is described to adopt
The input terminal of sample filter circuit is connect with the second end of first electronic DC switch, the output end of the wave filtering circuit
It is connect with the AD thief hatch of the pulse signal generating circuit.
The beneficial effects of the invention are as follows：The present invention can solve in AC speed regulating circuit, the DC electronic in bleed-off circuit
Switch and when electronic DC switch dead time very short (0.1-1.5uS) in main switch circuit, interfere when occurring in circuit or
When circuit abnormality, of short duration short circuit, which occurs, in the electronic DC switch of electronic DC switch and main switch circuit in bleed-off circuit to be caused
Larger dash current, makes electronic DC switch seriously overheat, the problem of even being burnt into unstable state.
Based on the above technical solution, the present invention can also be improved as follows.
Further, the wave filtering circuit includes current sampling resistor and is made of filter resistance and filter capacitor
Filter circuit, the current sampling resistor is connected on the second end of first electronic DC switch, the current sample electricity
After the filter circuit that the connection of resistance both ends is made of the filter resistance and the filter capacitor with the pulse signal generating circuit
AD thief hatch connection.
Further, if the main switch circuit includes the first rectification circuit, the first electronic DC switch and sampling filter
Circuit, then the bleed-off circuit includes the second rectification circuit, the second electronic DC switch and optocoupler, and second DC electronic is opened
The first end and second end of pass is connect with the cathode output end of second rectification circuit and cathode output end respectively, the optocoupler
The emitter and collector of middle triode is connect with the driving end of second electronic DC switch and DC power supply respectively, institute
The anode for stating light emitting diode in optocoupler is connect with the pulse signal output end of the pulse signal generating circuit, in the optocoupler
The cathode of light emitting diode is grounded.
Further, if the main switch circuit includes the first rectification circuit, the first electronic DC switch and sampling filter
Circuit, then the bleed-off circuit includes being symmetrically connected to the alternating current generator or first unidirectional electron at its major-minor winding both ends is opened
Powered-down road and the second unidirectional electron switching circuit.
Further, the first unidirectional electron switching circuit includes be made of the first triode and the first diode
The first biasing circuit that one main body circuit, also the first Zener diode, the first capacitance and the first current-limiting resistance are constituted；Described
The cathode of one diode is connected in parallel on the two of the alternating current generator or its major-minor winding after connecting the collector of first triode
End, wherein the emitter of first triode connects the first end of the alternating current generator or its major-minor winding, first limit
Leakage resistance one end connects the base stage of first triode, other end connection first capacitance in parallel and first Zener
Diode, wherein the anode of first Zener diode is connect with the alternating current generator or its major-minor winding first end；
Further, the second unidirectional electron switching circuit includes be made of the second triode and the second diode
The second biasing circuit that two main body circuits, also the second Zener diode, the second capacitance and the second current-limiting resistance are constituted；Described
The cathode of two diodes is connected in parallel on the two of the alternating current generator or its major-minor winding after connecting the collector of second triode
End, wherein the emitter of second triode connects the second end of the alternating current generator or its major-minor winding, second limit
Leakage resistance one end connects the base stage of second triode, other end connection second capacitance in parallel and second Zener
Diode, wherein the anode of second Zener diode is connect with the alternating current generator or its major-minor winding second end.
Further, if the bleed-off circuit includes the first rectification circuit, the first electronic DC switch and sampling filter electricity
Road, then the main switch circuit includes the second rectification circuit, the second electronic DC switch and optocoupler, and second DC electronic is opened
The first end and second end of pass is connect with the cathode output end of second rectification circuit and cathode output end respectively, the optocoupler
The emitter and collector of middle triode is connect with the driving end of second electronic DC switch and DC power supply respectively, institute
The anode for stating light emitting diode in optocoupler is connect with the pulse signal output end of the pulse signal generating circuit, in the optocoupler
The cathode of light emitting diode is grounded.
Further, the electronic DC switch used in load motor protection circuit is triode or metal-oxide-semiconductor,
When electronic DC switch is triode, first end is collector, and second end is emitter, and driving end is base stage；Work as direct current
When electronic switch is metal-oxide-semiconductor, first end is drain electrode, and second end is source electrode, and driving end is grid.
Further, the both ends of the alternating current generator or its major-minor winding are parallel with is made of a resistance and a capacitance
RC absorption circuits.
The advantages of additional aspect of the invention, will be set forth in part in the description, and will partly become from the following description
It obtains obviously, or practice is recognized through the invention.
Second of technical solution that the present invention solves above-mentioned technical problem is as follows：A kind of fan, including above-mentioned single phase ac
Motor protective circuit.
The third technical solution that the present invention solves above-mentioned technical problem is as follows：A kind of air-conditioning, including said fans.
Description of the drawings
Fig. 1 is load motor alignment circuit figure in the prior art；
Fig. 2 is circuit diagram simplified pinciple figure shown in Fig. 1；
Fig. 3 is the time control schematic diagram of schematic diagram shown in Fig. 2；
Fig. 4 is that load motor described in the embodiment of the present invention 1 protects circuit diagram；
Fig. 5 is that load motor described in the embodiment of the present invention 2 protects circuit diagram；
Fig. 6 is that load motor described in the embodiment of the present invention 3 protects circuit diagram.
Specific implementation mode
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
Fig. 4 is that load motor described in the embodiment of the present invention 1 protects circuit diagram.
As shown in figure 4, the load motor protection circuit in the embodiment of the present invention 1 includes alternating current generator, main switch time
Road, bleed-off circuit and pulse signal generating circuit, alternating current generator and main switch circuit in series in alternating current zero curve and firewire it
Between, bleed-off circuit and alternating current generator are in parallel, and the both ends of alternating current generator are parallel with to be absorbed by the RC that resistance RM1 and capacitance CM2 are formed
Circuit；Main switch circuit includes rectification circuit (being made of diode D6-D9), electronic DC switch K2 and wave filtering circuit,
The cathode output end of rectification circuit is connect with the first end of electronic DC switch K2, and the cathode output end of rectification circuit passes through sampling
Filter circuit is connect with the second end of electronic DC switch K2, the driving end of electronic DC switch K2 and pulse signal generating circuit
Pulse signal output end connection, specifically, the driving end of electronic DC switch K2 passes through resistance in the embodiment of the present invention 1
The pulse signal output end of R8 and pulse signal generating circuit connects；The input terminal of wave filtering circuit and electronic DC switch K2
Second end connection, the AD thief hatch of the output end of wave filtering circuit and pulse signal generating circuit connects, sampling filter electricity
Road includes current sampling resistor RK1 and the filter circuit that is made of resistance RK2 and capacitance CK1, and resistance RK1 is connected on direct current
The second end of sub switch K2, after the filter circuit that the connection of the both ends resistance RK1 is made of resistance RK2 and capacitance CK1 with pulse signal
The AD thief hatch of generation circuit connects.
Bleed-off circuit includes rectification circuit (being made of diode D1-D4), electronic DC switch K1 and optocoupler P1, direct current
The first end and second end of sub switch K1 is connect with the cathode output end of rectification circuit and cathode output end respectively, three in optocoupler P1
The emitter and collector of pole pipe is connect with the driving end of electronic DC switch K1 and DC power supply VCC1 respectively, in the present invention
Embodiment 1 in, the collector of triode is connect by resistance R7 with DC power supply VCC1 in optocoupler P1；Luminous two in optocoupler P1
The anode of pole pipe is connect with the pulse signal output end of pulse signal generating circuit, in the embodiment of the present invention 1, in optocoupler P1
The anode of light emitting diode is connected by the pulse signal output end of resistance R6 and pulse signal generating circuit, is shone in optocoupler P1
The cathode of diode is grounded.
In the present invention, when electronic DC switch K1, K2 are triode, first end is collector, and second end is transmitting
Pole, driving end are base stage；When electronic DC switch K1, K2 are metal-oxide-semiconductor, first end is drain electrode, and second end is source electrode, driving
End is grid, and the load motor as Fig. 4 is provided protects electronic DC switch K1, K2 for being used in circuit diagram for metal-oxide-semiconductor, tool
Body is depletion type MOS tube.
In the embodiment of the present invention 1, adopted by an electric current of connecting at electronic DC switch K2 in main switch circuit
Sample resistance RK1, converts current signal to voltage signal, is filtered by resistance RK2 and filter capacitor CK1, is input to arteries and veins
Rush the AD thief hatch of signal generating circuit, classification control may be implemented by monitoring the variation of the voltage in pulse signal generating circuit
System, wherein pulse signal generating circuit can select microcontroller, indicate microcontroller with U2 in Fig. 4.
In the embodiment of the present invention 1, if the normal current 200mA that resistance RK1 flows through, according to V=R*I=0.2*1
=0.2V, it is known that the voltage of 0.2V is input into the AD mouths of microcontroller U2, and microcontroller U2 constantly acquires the voltage, and the voltage is normal
When, normal pulse signal PWM1, PWM2 are sent out to drive electronic DC switch K1, K2 to work normally, and wherein microcontroller U2 is defeated
The pulse signal gone out into bleed-off circuit is PWM1, and the pulse signal being output in main switch circuit is PWM2.
When electronic DC switch K1, K2 occur abnormal, if the electric current that electronic DC switch K2 flows through reaches 510mA
When, the voltage at the both ends resistance RK1 is V=R*I=0.51*1=0.51V at this time, and microcontroller U2 samples electricity by AD thief hatch
The voltage at the both ends resistance RK1 is more than preset protection voltage 0.5V, and microcontroller U2 stops output PWM1 signals, i.e. electronic DC switch
K1 is stopped.A part of back-pressure of alternating current generator is absorbed by being connected in parallel on the resistance RM1 and capacitance CM2 at alternating current generator both ends,
The back-pressure at alternating current generator both ends increases, and efficiency reduces, but alternating current generator will not be caused out of service or electronic DC switch
The failures such as burn.After interference or abnormal restoring, the 200mA that is restored to of resistance RK1 electric currents, the electricity at the both ends resistance RK1 are flowed through
Pressure is restored to 0.2V, and microcontroller U2 restores normal PWM1 pulses output, and circuit restores normal work.
When electronic DC switch K1, K2 occur abnormal, if the electric current that electronic DC switch K2 flows through reaches 1000mA
When, the voltage at the both ends resistance RK1 is V=R*I=1*1=1V at this time, and microcontroller U2 samples resistance RK1 two by AD thief hatch
Terminal voltage is more than preset 0.9V, stops output PWM1, PWM2 signal, and electronic DC switch K1, K2 are stopped, straight to protect
Galvanic electricity sub switch K1, K2 is not burned out, and prompts user malfunction by display circuit.After interference or abnormal restoring, stream
Electric current through resistance RK1 is restored to 200mA, and the voltage at the both ends of resistance RK1 is restored to 0.2V, and microcontroller U2 restores normal
PWM1, PWM2 pulse export, and circuit restores normal work.
Fig. 5 is that load motor described in the embodiment of the present invention 2 protects circuit diagram.
As shown in figure 5, the load motor of load motor the protection circuit and embodiment 1 of the embodiment of the present invention 2
Protecting circuit to compare, difference lies in circuit structure and connection type and the main switches in embodiment 1 of the bleed-off circuit in embodiment 2
The circuit structure and connection type in circuit are identical, the circuit structure and connection type and reality in the main switch circuit in embodiment 2
It is identical to apply the circuit structure of bleed-off circuit and connection type in example 1.
The embodiment of the present invention 2 load motor protection circuit particular circuit configurations be：In the embodiment of the present invention 2
It includes alternating current generator, main switch circuit, bleed-off circuit and pulse signal generating circuit, alternating current that load motor, which protects circuit,
Machine and main switch circuit in series are between the zero curve and firewire of alternating current, and bleed-off circuit and alternating current generator are in parallel, alternating current generator
Both ends are parallel with the RC absorption circuits being made of resistance RM1 and capacitance CM2；Bleed-off circuit includes rectification circuit (by diode D1-
D4 is constituted), electronic DC switch K1 and wave filtering circuit, the of the cathode output end of rectification circuit and electronic DC switch K1
One end connects, and the cathode output end of rectification circuit is connect by wave filtering circuit with the second end of electronic DC switch K1, directly
The driving end of galvanic electricity sub switch K1 and the pulse signal output end of pulse signal generating circuit connect, in the embodiment of the present invention 2
In specifically, electronic DC switch K1 driving end pass through the pulse signal output end of resistance R8 and pulse signal generating circuit connect
It connects；The input terminal of wave filtering circuit is connect with the second end of electronic DC switch K1, the output end and arteries and veins of wave filtering circuit
The AD thief hatch connection of signal generating circuit is rushed, wave filtering circuit includes current sampling resistor RK1 and by resistance RK2 and electricity
Hold the filter circuit of CK1 compositions, resistance RK1 is connected on the second end of electronic DC switch K1, and the both ends resistance RK1 are connected by resistance
It is connect with the AD thief hatch of pulse signal generating circuit after the filter circuit of RK2 and capacitance CK1 compositions.
Main switch circuit includes rectification circuit (being made of diode D6-D9), electronic DC switch K2 and optocoupler P1, direct current
The first end and second end of electronic switch K2 is connect with the cathode output end of rectification circuit and cathode output end respectively, in optocoupler P1
The emitter and collector of triode is connect with the driving end of electronic DC switch K2 and DC power supply VCC1 respectively, in this hair
In bright embodiment 2, the collector of triode is connect by resistance R7 with DC power supply VCC1 in optocoupler P1；It shines in optocoupler P1
The anode of diode is connect with the pulse signal output end of pulse signal generating circuit, in the embodiment of the present invention 2, optocoupler P1
The anode of middle light emitting diode is connected by the pulse signal output end of resistance R6 and pulse signal generating circuit, is sent out in optocoupler P1
The cathode of optical diode is grounded.
In the embodiment of the present invention 2, adopted by an electric current of connecting at the electronic DC switch K1 in bleed-off circuit
Sample resistance RK1, converts current signal to voltage signal, is filtered by resistance RK2 and filter capacitor CK1, is input to arteries and veins
Rush the AD thief hatch of signal generating circuit, classification control may be implemented by monitoring the variation of the voltage in pulse signal generating circuit
System, wherein pulse signal generating circuit can select microcontroller, indicate microcontroller with U2 in Figure 5.
In the embodiment of the present invention 2, if the normal current 200mA that resistance RK1 flows through, according to V=R*I=0.2*1
=0.2V, it is known that the voltage of 0.2V is input into the AD mouths of microcontroller U2, and microcontroller U2 constantly acquires the voltage, and the voltage is normal
When, normal pulse signal PWM1, PWM2 are sent out to drive electronic DC switch K1, K2 to work normally, and wherein microcontroller U2 is defeated
The pulse signal gone out into bleed-off circuit is PWM1, and the pulse signal being output in main switch circuit is PWM2.
When electronic DC switch K1, K2 occur abnormal, if the electric current that electronic DC switch K1 flows through reaches 510mA
When, the voltage at the both ends resistance RK1 is V=R*I=0.51*1=0.51V at this time, and microcontroller U2 samples electricity by AD thief hatch
The voltage at the both ends resistance RK1 is more than preset protection voltage 0.5V, and microcontroller U2 stops output PWM1 signals, i.e. electronic DC switch
K1 is stopped.A part of back-pressure of alternating current generator is absorbed by being connected in parallel on the resistance RM1 and capacitance CM2 at alternating current generator both ends,
The back-pressure at alternating current generator both ends increases, and efficiency reduces, but alternating current generator will not be caused out of service or electronic DC switch
The failures such as burn.After interference or abnormal restoring, the 200mA that is restored to of resistance RK1 electric currents, the electricity at the both ends resistance RK1 are flowed through
Pressure is restored to 0.2V, and microcontroller U2 restores normal PWM1 pulses output, and circuit restores normal work.
When electronic DC switch K1, K2 occur abnormal, if the electric current that electronic DC switch K1 flows through reaches 1000mA
When, the voltage at the both ends resistance RK1 is V=R*I=1*1=1V at this time, and microcontroller U2 samples resistance RK1 two by AD thief hatch
Terminal voltage is more than preset 0.9V, stops output PWM1, PWM2 signal, and electronic DC switch K1, K2 are stopped, straight to protect
Galvanic electricity sub switch K1, K2 is not burned out, and prompts user malfunction by display circuit.After interference or abnormal restoring, stream
Electric current through resistance RK1 is restored to 200mA, and the voltage at the both ends of resistance RK1 is restored to 0.2V, and microcontroller U2 restores normal
PWM1, PWM2 pulse export, and circuit restores normal work.
Fig. 6 is that load motor described in the embodiment of the present invention 3 protects circuit diagram.
As shown in fig. 6, the bleed-off circuit in the embodiment of the present invention 3 includes the first list for being symmetrically connected to alternating current generator both ends
To electronic switching circuit and the second unidirectional electron switching circuit, the first unidirectional electron switching circuit includes by triode Q1 and two poles
The biasing circuit that the main body circuit that pipe D1 is constituted, also Zener diode Z1, capacitance C1 and current-limiting resistance R1 are constituted；Second is unidirectional
Electronic switching circuit includes the main body circuit being made of triode Q2 and diode D2, also Zener diode Z2, capacitance C2 and
The biasing circuit that current-limiting resistance R2 is constituted；It is connected in parallel on alternating current generator after the collector of the cathode connecting triode Q1 of diode D1
Both ends, the first end of the emitter connection alternating current generator of wherein triode Q1, the base of the one end current-limiting resistance R1 connecting triode Q1
Pole, the anode and alternating current generator first of the other end connection capacitance C1 and Zener diode Z1, wherein Zener diode Z1 in parallel
End connection；The both ends of alternating current generator, wherein triode Q2 are connected in parallel on after the collector of the cathode connecting triode Q2 of diode D2
Emitter connection alternating current generator second end, the base stage of the one end current-limiting resistance R2 connecting triode Q2, other end connection is in parallel
Capacitance C2 and Zener diode Z2, wherein Zener diode Z2 anode connect with alternating current generator second end.
In the positive half cycle of single-phase alternating current, i.e. the ends A are that positive voltage works as pulse signal generating circuit during the ends B are negative voltage
When the pulse signal of generation is high level, the conducting of single phase ac electric switch circuit, electric current is through Zener diode Z1, alternating current at this time
Machine, Zener diode Z2 flow through, driving alternating current generator operation；Meanwhile Zener diode Z1 reverse-conductings, both ends generate electricity
Pressure, capacitance C1 chargings, the electric current that the voltage that both ends generate generates are flowed through through resistance R1, triode Q1 base stages, emitter, three poles
Pipe Q1 conductings, diode D1 block source current to be flowed through through resistance R1, triode Q1 collectors around motor；Zener two simultaneously
Pole pipe Z2 forward conductions, both ends generate voltage, capacitance C2 chargings, and triode Q2 base stages are reverse biased, triode Q2 cut-offs,
Source current cannot flow through around alternating current generator through diode D2, triode Q2.When pulse signal is low level, single phase ac
Electric switch circuit turns off, and at this time because capacitance C1 discharges, triode Q1 continues to be connected, and because capacitance C2 discharges, triode Q2 continues to cut
Only；The inductance current of motor forms bleed-off circuit by diode D1, triode Q1 at this time.Similarly, in single-phase alternating current
Negative half period, i.e., the ends A be negative voltage, the ends B be positive voltage when, the inductance current of motor passes through diode D2, triode Q2 shapes
At bleed-off circuit.
Main switch circuit in embodiment 3 include rectification circuit (being made of diode D3-D6), electronic DC switch Q3 and
The cathode output end of wave filtering circuit, rectification circuit is connect with the first end of electronic DC switch Q3, the anode of rectification circuit
Output end is connect by wave filtering circuit with the second end of electronic DC switch Q3, the driving end of electronic DC switch Q3 and arteries and veins
The pulse signal output end connection for rushing signal generating circuit, specifically, electronic DC switch Q3 in the embodiment of the present invention 3
End is driven to be connected by the pulse signal output end of a resistance and pulse signal generating circuit；The input terminal of wave filtering circuit
It is connect with the second end of electronic DC switch Q3, the output end of wave filtering circuit and the AD thief hatch of pulse signal generating circuit
Connection, wave filtering circuit include current sampling resistor RK1 and the filter circuit that is made of resistance RK2 and capacitance CK1, resistance
RK1 is connected on the second end of electronic DC switch Q3, and the both ends resistance RK1 connect the filtered electrical being made of resistance RK2 and capacitance CK1
The AD thief hatch of Lu Houyu pulse signal generating circuits connects.
In the present invention, when electronic DC switch is triode, first end is collector, and second end is emitter, is driven
Moved end is base stage；When electronic DC switch is metal-oxide-semiconductor, first end is drain electrode, and second end is source electrode, and driving end is grid,
If electronic DC switch Q1, Q2 and Q3 for being used in load motor that Fig. 6 is provided protection circuit diagram are triode.
In the embodiment of the present invention 3, pass through an electric current of connecting at the electronic DC switch Q3 in main switch circuit
Sampling resistor RK1 is filtered by resistance RK2 filtering and capacitance CK1, is input to the AD samplings of pulse signal generating circuit
Mouthful, pulse signal generating circuit monitors the variation of the voltage, if when more than preset voltage value, closing electronic DC switch.Its
Middle pulse signal generating circuit can select microcontroller, indicate microcontroller with U2 in figure 6.
In the embodiment of the present invention 3, if resistance RK1 flows through normal current 200mA, according to V=R*I=0.2*1=
The voltage of 0.2V, the 0.2V are input into the AD thief hatch of microcontroller U2, and microcontroller U2 constantly acquires the voltage, and the voltage is normal
When, send out normal pulse signal, electronic DC switch Q3 normal works.
When electronic DC switch Q1, Q2, Q3 occur abnormal, if the electric current that electronic DC switch Q3 flows through reaches
When 1000mA, the voltage at the both ends resistance RK1 is V=R*I=1*1=1V, and microcontroller U2 samples resistance RK1 by AD thief hatch
Both end voltage is more than preset 0.9V, stops output pwm signal, electronic DC switch Q3 is stopped, to protect DC electronic
Switch Q1, Q2, Q3 are not burned out, and prompt user malfunction by display circuit.After interference or abnormal restoring, electricity is flowed through
The electric current of resistance RK1 is restored to 200mA, and the voltage at the both ends of resistance RK1 is restored to 0.2V, and microcontroller U2 restores normal PWM arteries and veins
Punching output, circuit are restored to normal operating conditions.
Alternating current generator in the present invention in above-mentioned all embodiments can also be changed to the major-minor winding of alternating current generator.
The present invention can solve in AC speed regulating circuit, the electronic DC switch and main switch circuit in bleed-off circuit it is straight
When galvanic electricity sub switch dead time very short (0.1-1.5uS), when occurring interfering in circuit or when circuit abnormality, in bleed-off circuit
Electronic DC switch and the electronic DC switch in main switch circuit there is of short duration short circuit and cause larger dash current, make direct current
Electronic switch seriously overheats, and is even burnt into unstable state.
The present invention facilitates pulse signal generating circuit to examine by the way that the alternating current rectification of alternating current generator is become DC current
It surveys.The variation of DC current in electronic DC switch operation, detection electronic DC switch work, according to the big of electric current
Small, classification default different current threshold stops output PWM1 or PWM1 and PWM2 respectively when electric current reaches different threshold values
Pulse signal avoids electronic DC switch damage, is interfered, and after abnormal restoring, circuit automatically restores to normal work shape
State avoids device from burning.
The present invention also provides a kind of fans, including the load motor described in above-described embodiment 1-3 protects circuit.
The present invention also provides a kind of air-conditionings, including said fans.
In the description of this specification, reference term " embodiment one ", " embodiment two ", " example ", " specific example " or
The description of " some examples " etc. means that specific method, device or feature described in conjunction with this embodiment or example are contained in this hair
In bright at least one embodiment or example.In the present specification, schematic expression of the above terms are necessarily directed to
Identical embodiment or example.Moreover, specific features, method, apparatus or the feature of description can be in any one or more realities
It applies and can be combined in any suitable manner in example or example.In addition, without conflicting with each other, those skilled in the art can incite somebody to action
The feature of different embodiments or examples and different embodiments or examples described in this specification is combined.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (11)
1. a kind of load motor protects circuit, which is characterized in that returned including alternating current generator or its major-minor winding, main switch
Road, bleed-off circuit and pulse signal generating circuit；
The alternating current generator or its major-minor winding and the main switch circuit in series are described between the zero curve and firewire of alternating current
Bleed-off circuit and the alternating current generator or its major-minor winding parallel；
The main switch circuit or the bleed-off circuit include the first rectification circuit, the first electronic DC switch and sampling filter electricity
Road, the cathode output end of first rectification circuit are connect with the first end of first electronic DC switch, and described first is whole
The cathode output end of current circuit is connect by the wave filtering circuit with the second end of first electronic DC switch, described
The driving end of first electronic DC switch is connect with the pulse signal output end of the pulse signal generating circuit；The sampling filter
The input terminal of wave circuit is connect with the second end of first electronic DC switch, the output end of the wave filtering circuit and institute
State the AD thief hatch connection of pulse signal generating circuit.
2. load motor according to claim 1 protects circuit, which is characterized in that the wave filtering circuit includes
Current sampling resistor and the filter circuit being made of filter resistance and filter capacitor, the current sampling resistor are connected on described
The second end of first electronic DC switch, the current sampling resistor both ends connection is by the filter resistance and the filter capacitor
It is connect with the AD thief hatch of the pulse signal generating circuit after the filter circuit of composition.
3. load motor according to claim 2 protects circuit, which is characterized in that if the main switch circuit includes
First rectification circuit, the first electronic DC switch and wave filtering circuit, then the bleed-off circuit includes the second rectification circuit, the
Two electronic DC switches and optocoupler, the first end and second end of second electronic DC switch respectively with second rectified current
The cathode output end on road is connected with cathode output end, and the emitter and collector of triode is respectively with described second in the optocoupler
The driving end of electronic DC switch and DC power supply connect, the anode of light emitting diode and the pulse signal in the optocoupler
The pulse signal output end of generation circuit connects, the cathode ground connection of light emitting diode in the optocoupler.
4. load motor according to claim 2 protects circuit, which is characterized in that if the main switch circuit includes
First rectification circuit, the first electronic DC switch and wave filtering circuit, then the bleed-off circuit is described including being symmetrically connected to
The the first unidirectional electron switching circuit and the second unidirectional electron switching circuit of alternating current generator or its major-minor winding both ends.
5. load motor according to claim 4 protects circuit, which is characterized in that the first unidirectional electron switch
Circuit includes the first main body circuit being made of the first triode and the first diode, also the first Zener diode, the first electricity
Hold the first biasing circuit constituted with the first current-limiting resistance；The cathode of first diode connects the collection of first triode
The both ends of the alternating current generator or its major-minor winding are connected in parallel on after electrode, wherein described in the emitter connection of first triode
The first end of alternating current generator or its major-minor winding, first current-limiting resistance one end connect the base stage of first triode, separately
One end connection first capacitance in parallel and first Zener diode, wherein the anode of first Zener diode with
The alternating current generator or the connection of its major-minor winding first end.
6. load motor according to claim 4 protects circuit, which is characterized in that the second unidirectional electron switch
Circuit includes the second main body circuit being made of the second triode and the second diode, also the second Zener diode, the second electricity
Hold the second biasing circuit constituted with the second current-limiting resistance；The cathode of second diode connects the collection of second triode
The both ends of the alternating current generator or its major-minor winding are connected in parallel on after electrode, wherein described in the emitter connection of second triode
The second end of alternating current generator or its major-minor winding, second current-limiting resistance one end connect the base stage of second triode, separately
One end connection second capacitance in parallel and second Zener diode, wherein the anode of second Zener diode with
The alternating current generator or the connection of its major-minor winding second end.
7. load motor according to claim 2 protects circuit, which is characterized in that if the bleed-off circuit includes the
One rectification circuit, the first electronic DC switch and wave filtering circuit, then the main switch circuit includes the second rectification circuit, the
Two electronic DC switches and optocoupler, the first end and second end of second electronic DC switch respectively with second rectified current
The cathode output end on road is connected with cathode output end, and the emitter and collector of triode is respectively with described second in the optocoupler
The driving end of electronic DC switch and DC power supply connect, the anode of light emitting diode and the pulse signal in the optocoupler
The pulse signal output end of generation circuit connects, the cathode ground connection of light emitting diode in the optocoupler.
8. the load motor according to any one of claim 1-7 protects circuit, which is characterized in that the blow-up
The electronic DC switch used in stream motor protective circuit is triode or metal-oxide-semiconductor, when electronic DC switch is triode,
First end is collector, and second end is emitter, and driving end is base stage；When electronic DC switch is metal-oxide-semiconductor, first end is
Drain electrode, second end is source electrode, and driving end is grid.
9. load motor according to claim 3 or 7 protects circuit, which is characterized in that the alternating current generator or its
The both ends of major-minor winding are parallel with the RC absorption circuits being made of a resistance and a capacitance.
10. a kind of fan, which is characterized in that protect circuit including claim 1-9 any one of them load motors.
11. a kind of air-conditioning, which is characterized in that including fan according to any one of claims 10.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610203435.5A CN105680418B (en) | 2016-03-31 | 2016-03-31 | A kind of load motor protection circuit, fan and air-conditioning |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610203435.5A CN105680418B (en) | 2016-03-31 | 2016-03-31 | A kind of load motor protection circuit, fan and air-conditioning |
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| Publication Number | Publication Date |
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| CN105680418A CN105680418A (en) | 2016-06-15 |
| CN105680418B true CN105680418B (en) | 2018-09-11 |
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| CN201610203435.5A Active CN105680418B (en) | 2016-03-31 | 2016-03-31 | A kind of load motor protection circuit, fan and air-conditioning |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107026595B (en) * | 2017-06-20 | 2019-12-06 | 广东美的环境电器制造有限公司 | motor speed regulation circuit, method and device |
| CN110701761B (en) * | 2019-10-26 | 2021-04-02 | 昆明理工大学津桥学院 | Air-conditioning fan control circuit |
| CN110829914B (en) * | 2019-11-08 | 2021-07-09 | 陕西航空电气有限责任公司 | Wide-range short-circuit current limiting device of three-phase alternating-current generator |
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| EP2003771A1 (en) * | 2007-06-11 | 2008-12-17 | Société industrielle de Sonceboz S.A. | Closed loop sensorless control of permanent magnet synchronous motors |
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| CN105450141A (en) * | 2015-12-31 | 2016-03-30 | 杭州士兰微电子股份有限公司 | AC motor driving device and driving method |
| CN205583652U (en) * | 2016-03-31 | 2016-09-14 | 广东美的环境电器制造有限公司 | Single -phase alternating current motor protection circuit, fan and air conditioner |
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| EP2003771A1 (en) * | 2007-06-11 | 2008-12-17 | Société industrielle de Sonceboz S.A. | Closed loop sensorless control of permanent magnet synchronous motors |
| CN102315822A (en) * | 2010-06-29 | 2012-01-11 | 施耐德东芝换流器欧洲公司 | The control method and the system of compensation Dead Time in pulse width modulation controlled |
| CN103684199A (en) * | 2013-12-21 | 2014-03-26 | 宋崇辉 | Drive system for unit parallel shunting at side of wound rotor motor operating in two quadrants |
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| CN105680418A (en) | 2016-06-15 |
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