CN214045007U - Motor protection circuit and air condensing units - Google Patents
Motor protection circuit and air condensing units Download PDFInfo
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- CN214045007U CN214045007U CN202022483942.3U CN202022483942U CN214045007U CN 214045007 U CN214045007 U CN 214045007U CN 202022483942 U CN202022483942 U CN 202022483942U CN 214045007 U CN214045007 U CN 214045007U
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Abstract
The utility model is suitable for a household electrical appliances technical field provides a motor protection circuit and air condensing units, and the circuit includes: the bus voltage division detection module is connected with the motor bus and used for carrying out voltage division resistance detection on the motor bus to generate a first voltage division signal; the control end voltage division detection module is connected with a power supply of the motor controller and is used for carrying out voltage division resistance detection on the power supply to generate a second voltage division signal; the comparison output module is connected with the output ends of the reference voltage end, the bus partial pressure detection module and the control end partial pressure detection module, and is used for receiving the reference voltage signal, the first partial pressure signal and the second partial pressure signal and outputting a comparison signal; the motor speed control module is connected with the output end of the comparison output module and used for receiving and outputting a speed control voltage signal to the motor according to the comparison signal. This application is through when motor bus voltage and motor controller's mains voltage arbitrary one appear undervoltage, all can cut off the input of accuse fast voltage signal, protection motor safety.
Description
Technical Field
The utility model belongs to the technical field of the electronic circuit, especially, relate to a motor protection circuit and air condensing units.
Background
In order to improve the stability of the air conditioner, an outdoor BLDC (Brushless Direct Current Motor) Motor control board of the air conditioner needs to ensure that the Motor can be stably started and continuously and normally work in various working modes, so that the Motor needs to be monitored for voltage, Current and the like, and corresponding protection measures are provided.
The circuit protection measures of the outdoor BLDC control panel of the fixed-frequency air conditioner on the market basically aim at corresponding protection in the running process of a motor. However, in the process of powering on and powering off the motor, the motor is directly started to work, and because the voltage of the switching power supply is stabilized to have a process, the power supply voltage of the motor control end is still raised, so that the internal IGBT module of the motor is not completely conducted, the motor generates heat seriously through large current in a short time, and when the voltage of the motor bus becomes low due to voltage fluctuation, the rotating speed of the motor is rapidly reduced, the heat of the condenser cannot be taken away in time, so that the motor works in a high-temperature environment, and the motor is damaged.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a motor protection circuit aims at solving the problem that the power-on process does not have safeguard measure on the motor.
The embodiment of the utility model provides a realize like this, a motor protection circuit, the circuit includes:
the bus voltage division detection module is connected with the motor bus and used for carrying out voltage division resistance detection on the motor bus to generate a first voltage division signal;
the control end voltage division detection module is connected with a power supply of the motor controller and used for carrying out voltage division resistance detection on the power supply to generate a second voltage division signal;
the comparison output module is connected with the output ends of the reference voltage end, the bus voltage division detection module and the control end voltage division detection module, and is used for receiving the reference voltage signal, the first voltage division signal and the second voltage division signal and outputting a comparison signal;
and the motor speed control module is connected with the output end of the comparison output module and is used for receiving and outputting a speed control voltage signal to the motor according to the comparison signal.
Furthermore, the bus voltage division detection module comprises a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor and a first diode;
one end of the first resistor is connected with the motor bus, the other end of the first resistor is grounded through a second resistor and a first capacitor which are sequentially connected in series, the other end of the first resistor is also connected with the anode of a first diode, the cathode of the first diode is connected to a first voltage end, and one end of the second resistor, which is connected with the first capacitor, is connected with the comparison output module;
the third resistor and the second capacitor are both connected in parallel with the series body of the second resistor and the first capacitor.
Furthermore, the control end voltage division detection module comprises a fourth resistor, a fifth resistor and a third capacitor;
one end of the fourth resistor is connected with the control power supply end, the other end of the fourth resistor is grounded through the fifth resistor, the other end of the fourth resistor is further connected with the comparison output module, and the third capacitor is connected with the fifth resistor in parallel.
Furthermore, the comparison output module comprises a first comparator, a second comparator, a sixth resistor, a seventh resistor, an eighth resistor and a first switch tube;
the reverse input end of the first comparator is connected with one end of the second resistor, the forward input end of the first comparator is connected with the reference voltage end, the output end of the first comparator is connected with the first voltage end through the sixth resistor, and the output end of the first comparator is also connected with one end of the seventh resistor;
the first pole of the first switch tube is connected with the other end of the seventh resistor, the second pole of the first switch tube is grounded, and the third pole of the first switch tube is connected with the reverse input end of the second comparator;
the positive input end of the second comparator is connected with the reference voltage end, the reverse input end of the second comparator is further connected with the other end of the fourth resistor, the output end of the second comparator is connected with the motor speed control module, and the output end of the second comparator is further connected with the first voltage end through the eighth resistor.
Still further, the circuit further comprises:
and the reference voltage module comprises a reference voltage end and is used for outputting a reference voltage signal to the comparison output module.
Furthermore, the reference voltage module comprises a ninth resistor, a tenth resistor, an eleventh resistor, a fourth capacitor and a first three-terminal regulator;
one end of the ninth resistor is connected with the first voltage end, the other end of the ninth resistor is grounded through the tenth resistor and the eleventh resistor in sequence, the other end of the ninth resistor is also used as a reference voltage end and is connected with the positive input ends of the first comparator and the second comparator respectively, and the positive input end of the first comparator is also grounded through the fourth capacitor;
the first end of the first three-terminal voltage stabilizer is connected to a line between the tenth resistor and the eleventh resistor, the second end of the first three-terminal voltage stabilizer is connected with the other end of the ninth resistor, and the third end of the first three-terminal voltage stabilizer is grounded.
Furthermore, the motor speed control module comprises a twelfth resistor, a thirteenth resistor and a second switch tube;
the second pole of the second switch tube is connected with the first voltage end, the first pole is connected with the output end of the second comparator through a twelfth resistor, and the third pole is connected with the motor through a thirteenth resistor.
Furthermore, the motor speed control module further comprises a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a fifth capacitor, a sixth capacitor, a voltage stabilizing diode and a second three-terminal voltage stabilizer;
one end of a fourteenth resistor is connected with one end of the thirteenth resistor, which is far away from the second switching tube, one end of the fourteenth resistor is further grounded through the fifteenth resistor and the fifth capacitor in sequence, the other end of the fourteenth resistor is grounded through the sixteenth resistor, and a line between the fifteenth resistor and the fifth capacitor is connected with the motor;
the cathode of the voltage stabilizing diode is connected with one end of the fourteenth resistor, and the anode of the voltage stabilizing diode is grounded;
the first end of the second three-terminal voltage stabilizer is connected with the other end of the fourteenth resistor, the second end of the second three-terminal voltage stabilizer is connected with one end of the fourteenth resistor, and the third end of the second three-terminal voltage stabilizer is grounded;
and the sixth capacitor is connected with the fifth capacitor in parallel.
Further, the second capacitor and the fifth capacitor are electrolytic capacitors.
In a second aspect, the present application further provides an outdoor unit of an air conditioner, where the outdoor unit of the air conditioner includes a motor and the motor protection circuit as described above.
In the embodiment of the application, the bus voltage division detection module is arranged for carrying out voltage division resistance detection on the voltage of the motor bus to obtain a first voltage division signal for representing the voltage of the motor bus, the control end voltage division detection module is also used for carrying out voltage division resistance detection on the power voltage of the motor controller to obtain a second voltage division signal for representing the power voltage of the motor controller, the comparison output module is used for comparing the first voltage division signal and the second voltage division signal with a reference voltage signal to output a comparison signal to the motor speed control module, the motor speed control module can control the on-off of the motor according to the comparison signal, only when the first voltage division signal and the second voltage division signal are both greater than the reference voltage signal, namely when the motor bus voltage and the power voltage of the motor controller both reach working voltages, the speed control voltage signal is allowed to be input to the motor, otherwise, when any one of the motor bus voltage and the power voltage of the motor controller is under-voltage, the input of the speed control voltage signal is cut off, and the safety of the motor is protected.
Drawings
FIG. 1 is a block diagram of an embodiment of a motor protection circuit of the present application;
FIG. 2 is a schematic diagram of a specific circuit structure of an embodiment of the motor protection circuit of the present application;
FIG. 3 is a block diagram of another embodiment of a motor protection circuit according to the present application;
fig. 4 is a schematic diagram of a specific circuit structure of another embodiment of the motor protection circuit of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The prior art has no protection measures aiming at the power-on and starting process of the motor. This application is electrified in-process and is detected motor bus voltage and motor controller's mains voltage on the motor, when motor bus voltage and motor controller's mains voltage arbitrary one appears under-voltage, all can cut off the input of accuse fast voltage signal, avoids motor and motor controller work in the condition that the motor was damaged to the undervoltage state, protection motor safety.
Example one
In some optional embodiments, please refer to fig. 1, and fig. 1 is a schematic diagram of a module structure of an embodiment of a motor protection circuit according to the present application.
As shown in fig. 1, a first aspect of the present application provides a motor protection circuit, which includes a bus voltage division detection module 1. The control end partial pressure detection module 2, the comparison output module 3 and the motor speed control module 4;
the bus voltage division detection module 1 is connected with a motor bus and used for carrying out voltage division resistance detection on the motor bus to generate a first voltage division signal;
the control end voltage division detection module 2 is connected with a power supply of the motor controller and is used for carrying out voltage division resistance detection on the power supply to generate a second voltage division signal;
the comparison output module 3 is connected with the reference voltage terminal Vref, the output terminal of the bus partial pressure detection module 1 and the output terminal of the control terminal partial pressure detection module 2, and is used for receiving the reference voltage signal, the first partial pressure signal and the second partial pressure signal and outputting a comparison signal;
the motor speed control module 4 is connected with the output end of the comparison output module 3 and used for receiving and outputting a speed control voltage signal to the motor according to the comparison signal.
When implementing, the motor bus is connected with the motor and is used for providing operating voltage for the motor, motor controller is connected the rotational speed that is used for controlling the motor with the motor, the power is used for providing operating voltage for motor controller, under some unstable circumstances of voltage, for example when motor bus is under-voltage, the rotational speed of motor can reduce the life-span that shortens the motor, and when mains voltage reduces, the motor lasts the operation, but IGBT module among the motor controller is incomplete to switch on, motor controller calorific capacity is big, lead to the IGBT module to burn out easily, the damage appears in the motor. The bus voltage division detection module 1 is connected with a motor bus, so that voltage division resistance detection is carried out on the motor bus voltage to obtain a first voltage division signal, and the first voltage division signal represents the motor bus voltage; the control end voltage division detection module 2 is connected with a power supply of the motor controller, so that voltage division resistance detection is carried out on the power supply voltage to obtain a second voltage division signal, and the second voltage division signal represents the power supply voltage; the reference voltage terminal Vref is used for outputting a reference voltage signal, the comparison output module 3 is used for comparing the first partial pressure signal with the reference voltage signal, and simultaneously, the second partial pressure signal is compared with the reference voltage signal and then a comparison signal of a comparison result is output, the motor speed control module 4 is used for receiving the comparison signal and controlling the on-off of the output speed control voltage signal to the motor according to the comparison signal, specifically, the speed control voltage signal is used for controlling the rotating speed of the motor, when any one of the first partial pressure signal and the second partial pressure signal is lower than the reference voltage signal, the input of the speed control voltage signal is cut off, only when the first partial pressure signal and the second partial pressure signal are simultaneously higher than the reference voltage signal, the speed control voltage signal is input to the motor, the motor is prevented from working under unfavorable working voltage, and the motor is protected.
This application is used for carrying out divider resistance detection to the voltage of motor bus through setting up generating line partial pressure detection module 1, acquire the first partial pressure signal of sign motor bus voltage, still carry out divider resistance detection to motor controller's mains voltage through control end partial pressure detection module 2, acquire the second partial pressure signal of the mains voltage of sign motor controller, carry out comparison output comparison signal to motor accuse fast module 4 with first partial pressure signal and second partial pressure signal and reference voltage signal by comparison output module 3, because motor accuse fast module 4 can be according to the break-make of comparison signal control and motor, when motor bus voltage and motor controller's mains voltage arbitrary one appears under-voltage, all can cut off the input of accuse fast voltage signal, the protection motor.
Example two
In some alternative embodiments, please refer to fig. 2, fig. 2 is a schematic diagram of a specific circuit structure according to an embodiment of the present application.
As shown in fig. 2, the bus voltage division detection module 1 includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, and a first diode D1;
one end of the first resistor R1 is connected with the motor bus, the other end of the first resistor R2 and the first capacitor C1 are sequentially connected in series and grounded, the other end of the first resistor R2 is also connected with the anode of the first diode D1, the cathode of the first diode D1 is connected with the first voltage end VE, and the end, connected with the first capacitor C1, of the second resistor R2 is connected with the comparison output module 3;
the third resistor R3 and the second capacitor C2 are both connected in parallel with the series connection of the second resistor R2 and the first capacitor C1.
In implementation, one end of the first resistor R1 is connected to the bus voltage end VDC of the motor bus, the voltage division resistor detection is performed on the motor bus voltage through the first resistor R1 and the third resistor R3, one end of the second resistor R2 connected to the first capacitor C1 outputs a first division signal to the comparison output module 3, and the second capacitor C2 may be an electrolytic capacitor and plays a role in stabilizing the voltage.
EXAMPLE III
The control end voltage division detection module 2 comprises a fourth resistor R4, a fifth resistor R5 and a third capacitor C3;
one end of the fourth resistor R4 is connected to the control power supply terminal Vk, the other end is grounded through the fifth resistor R5, the other end is further connected to the comparison output module 3, and the third capacitor C3 is connected in parallel to the fifth resistor R5.
In implementation, the control power supply terminal Vk is an output terminal of a power supply of the motor controller, voltage division resistance detection is performed on the power supply through voltage division effects of the fourth resistor R4 and the fifth resistor R5, and a line connected with the fourth resistor R4 and the fifth resistor R5 outputs a second voltage division signal to the comparison output module 3.
Example four
In some embodiments, the comparison output module 3 includes a first comparator U1, a second comparator U2, a sixth resistor R6, seventh resistors R7 and, eighth resistor R8 and a first switch tube Q1;
the reverse input end of the first comparator U1 is connected with one end of the second resistor R2, the forward input end is connected with the reference voltage end Vref, the output end is connected with the first voltage end VE through the sixth resistor R6, and the output end is also connected with one end of the seventh resistor R7;
a first pole of the first switch tube Q1 is connected with the other end of the seventh resistor R7, a second pole is grounded, and a third pole is connected with the reverse input end of the second comparator U2;
the positive input end of the second comparator U2 is connected to the reference voltage terminal Vref, the negative input end is further connected to the other end of the fourth resistor R4, the output end is connected to the motor speed control module 4, and the output end is further connected to the first voltage terminal VE through the eighth resistor R8.
In an implementation, the switch tube may be any one of a triode and a MOS, wherein a first terminal of the switch tube is a base (gate), a second terminal of the switch tube is an emitter (source), a third terminal of the switch tube is a collector (drain), a forward input terminal of the first comparator U1 is connected to the reference voltage terminal Vref, a reverse input terminal of the first comparator U1 is connected to a line between the first resistor R1 and the third resistor R3 through the second resistor R2, the first resistor R1 and the second resistor R3 perform voltage division resistance detection on the motor bus voltage, when the voltage of the reference voltage terminal Vref is higher than the voltage of the first voltage division signal, taking the switch tube as an example, the first comparator U1 outputs a high level to the base of the first switch tube Q1, the first switch tube Q1 is turned on, a reverse input terminal of the second comparator U2 is grounded, and the reverse input terminal of the second comparator U2 is further connected to a second voltage division signal line between the fourth resistor R4 and the fifth resistor R5, at this time, no matter the second voltage division signal is at a high level or a low level, the inverting input terminal of the second comparator U2 is at a low level, the forward input terminal of the second comparator U2 is connected to the reference voltage terminal Vref, and the second comparator U2 outputs a high level to the motor speed control module 4.
When the voltage of the reference voltage terminal Vref is lower than the voltage of the first divided voltage signal, the first comparator U1 outputs a low level to the base of the first switch Q1, the first switch Q1 is turned off, and at this time, when the voltage of the second divided voltage signal is lower than the voltage of the reference voltage signal, the second comparator U2 outputs a high level to the motor speed control module 4; when the voltage of the second divided voltage signal is higher than that of the reference voltage signal, the second comparator U2 outputs a low level to the motor speed control module 4, so that the second comparator U2 outputs a low level only when the first divided voltage signal and the second divided voltage signal are both higher than that of the reference voltage signal, and when the voltage of any one of the first divided voltage signal and the second divided voltage signal is lower than that of the reference voltage signal, the second comparator U2 outputs a high level, the motor speed control module 4 controls the speed control voltage signal to the motor according to the level of the output signal of the second comparator U2, for example, when the second comparator U2 outputs a low level, the speed control voltage signal is allowed to be input to the motor, and when the second comparator U2 outputs a high level, the speed control voltage signal is cut off from being input to the motor.
EXAMPLE five
In some embodiments, please refer to fig. 3, fig. 3 is a circuit module schematic diagram of another embodiment of the present application. As shown in fig. 3, the motor protection circuit provided by the present application further includes a reference voltage module 5;
the reference voltage module 5 includes a reference voltage terminal Vref, and the reference voltage module 5 is configured to output a reference voltage signal to the comparison output module 3.
In some embodiments, as shown in fig. 2, the reference voltage module 5 includes a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a fourth capacitor C4, and a first three-terminal regulator UT 1;
one end of the ninth resistor R9 is connected to the first voltage end VE, the other end is grounded through the tenth resistor R10 and the eleventh resistor R11 in sequence, the other end is also connected to the positive input ends of the first comparator U1 and the second comparator U2 as the reference voltage end Vref, and the positive input end of the first comparator U1 is grounded through the fourth capacitor C4;
the first end of the first three-terminal regulator UT1 is connected to the line between the tenth resistor R10 and the eleventh resistor R11, the second end is connected to the other end of the ninth resistor R9, and the third end is grounded.
In implementation, the first three-terminal regulator UT1 adopts TL431, the TL431 is a controllable precision voltage-stabilizing source, and the second terminal of the first three-terminal regulator UT1 is used as a reference voltage terminal Vref to output a stable reference voltage signal, so that the comparison accuracy of the comparison output module 3 is improved.
EXAMPLE six
In some optional embodiments, the motor speed control module 4 includes a twelfth resistor R12, a thirteenth resistor R13, and a second switching tube Q2;
the second pole of the second switching tube Q2 is connected to the first voltage terminal VE, the first pole is connected to the output terminal of the second comparator U2 through a twelfth resistor R12, and the third pole is connected to the motor through a thirteenth resistor R13.
In operation, when the second comparator U2 outputs a high level, the second switch Q2 is turned off to cut off the input of the speed control voltage signal to the motor, and when the second comparator U2 outputs a low level, the second switch Q2 is turned on to allow the input of the speed control voltage signal to the motor.
EXAMPLE seven
In some optional embodiments, the motor speed control module 4 further includes a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a fifth capacitor C5, a sixth capacitor C6, a zener diode D2, and a second three-terminal regulator UT 2;
one end of a fourteenth resistor R14 is connected with one end of a thirteenth resistor R13 far away from the second switching tube Q2, one end of the fourteenth resistor R14 is further grounded through a fifteenth resistor R15 and a fifth capacitor C5 in sequence, the other end of the fourteenth resistor R14 is grounded through a sixteenth resistor R16, and a circuit between the fifteenth resistor R15 and the fifth capacitor C5 is connected with the motor;
the cathode of the voltage stabilizing diode D2 is connected with one end of the fourteenth resistor R14, and the anode of the voltage stabilizing diode D2 is grounded;
the first end of the second three-terminal regulator UT2 is connected with the other end of the fourteenth resistor R14, the second end of the second three-terminal regulator UT2 is connected with one end of the fourteenth resistor R14, and the third end of the second three-terminal regulator UT2 is grounded;
the sixth capacitor C6 is connected in parallel with the fifth capacitor C5.
In practice, the fifth capacitor C5 is an electrolytic capacitor, and functions to stabilize voltage.
Example eight
In some embodiments, the plug port CN1 may be further designed to be connected to a motor in a pluggable manner, please refer to fig. 4, fig. 4 is a schematic diagram of a specific circuit structure including the plug port CN1 according to an embodiment of the present application, and as shown in fig. 4, the plug port CN1 includes a pin 1, a pin 2, a pin 3, a pin 4, and a pin 5, where the pin 1 is connected to the bus voltage terminal VDC for providing a working voltage for the motor; the pin 2 is grounded, and a seventh capacitor C7 and a seventeenth resistor R17 are connected between the pin 2 and the pin 1, and in implementation, the seventeenth resistor R17 may adopt a variable resistor or a potentiometer; pin 3 is connected to the first voltage terminal VE, and pin 3 is also grounded through an eighth capacitor C8; the pin 4 is connected to a line between the fifteenth resistor R15 and the fifth capacitor C5; the pin 5 is suspended; the motor can be connected in a pluggable mode through the plugging port CN1, and the motor is conveniently connected.
Example nine
In some optional embodiments, the present application further provides an outdoor unit of an air conditioner, which includes a motor and the motor protection circuit as described above. The motor protection circuit comprises a bus voltage division detection module 1. The control terminal partial pressure detection module 2, the comparison output module 3 and the motor speed control module 4, wherein the bus partial pressure detection module 1 is used for detecting the partial pressure resistance of the voltage of the motor bus to obtain a first partial pressure signal representing the voltage of the motor bus, the control terminal partial pressure detection module 2 is used for detecting the partial pressure resistance of the power voltage of the motor controller to obtain a second partial pressure signal representing the power voltage of the motor controller, the comparison output module 3 is used for comparing the first partial pressure signal and the second partial pressure signal with a reference voltage signal to output a comparison signal to the motor speed control module 4, and the motor speed control module 4 controls the on-off of the output speed control voltage signal to the motor, when any one of the motor bus and the power supply of the motor controller is under-voltage, the input of a speed control voltage signal is cut off, the safety of the motor is protected, and the safety of the outdoor unit of the air conditioner is further protected.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A motor protection circuit, the circuit comprising:
the bus voltage division detection module is connected with the motor bus and used for carrying out voltage division resistance detection on the motor bus to generate a first voltage division signal;
the control end voltage division detection module is connected with a power supply of the motor controller and used for carrying out voltage division resistance detection on the power supply to generate a second voltage division signal;
the comparison output module is connected with the output ends of the reference voltage end, the bus partial pressure detection module and the control end partial pressure detection module, and is used for receiving a reference voltage signal, the first partial pressure signal and the second partial pressure signal and outputting a comparison signal;
and the motor speed control module is connected with the output end of the comparison output module and used for receiving and outputting a speed control voltage signal to the motor according to the comparison signal.
2. The motor protection circuit of claim 1, wherein the bus voltage division detection module comprises a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, and a first diode;
one end of the first resistor is connected with a motor bus, the other end of the first resistor is grounded through the second resistor and the first capacitor which are sequentially connected in series, the other end of the first resistor is also connected with the anode of the first diode, the cathode of the first diode is connected to a first voltage end, and one end of the second resistor, which is connected with the first capacitor, is connected with the comparison output module;
the third resistor and the second capacitor are both connected in parallel with a series connection body of the second resistor and the first capacitor.
3. The motor protection circuit of claim 2, wherein the control terminal voltage division detection module comprises a fourth resistor, a fifth resistor and a third capacitor;
one end of the fourth resistor is connected with a control power supply end, the other end of the fourth resistor is grounded through the fifth resistor, the other end of the fourth resistor is further connected with the comparison output module, and the third capacitor is connected with the fifth resistor in parallel.
4. The motor protection circuit of claim 3, wherein the comparison output module comprises a first comparator, a second comparator, a sixth resistor, a seventh resistor, an eighth resistor and a first switch tube;
the reverse input end of the first comparator is connected with one end of the second resistor, the forward input end of the first comparator is connected with the reference voltage end, the output end of the first comparator is connected with the first voltage end through the sixth resistor, and the output end of the first comparator is also connected with one end of the seventh resistor;
the first stage of the first switching tube is connected with the other end of the seventh resistor, the second stage of the first switching tube is grounded, and the third pole of the first switching tube is connected with the reverse input end of the second comparator;
and the positive input end of the second comparator is connected with the reference voltage end, the negative input end of the second comparator is also connected with the other end of the fourth resistor, the output end of the second comparator is connected with the motor speed control module, and the output end of the second comparator is also connected with the first voltage end through the eighth resistor.
5. The motor protection circuit of claim 4, wherein the circuit further comprises:
and the reference voltage module comprises the reference voltage end and is used for outputting the reference voltage signal to the comparison output module.
6. The motor protection circuit of claim 5, wherein the reference voltage module comprises a ninth resistor, a tenth resistor, an eleventh resistor, a fourth capacitor, and a first three-terminal regulator;
one end of the ninth resistor is connected with the first voltage end, the other end of the ninth resistor is grounded through the tenth resistor and the eleventh resistor in sequence, the other end of the ninth resistor is also used as the reference voltage end and is connected with the positive input ends of the first comparator and the second comparator respectively, and the positive input end of the first comparator is also grounded through the fourth capacitor;
and the first end of the first three-terminal regulator is connected to a line between the tenth resistor and the eleventh resistor, the second end of the first three-terminal regulator is connected with the other end of the ninth resistor, and the third end of the first three-terminal regulator is grounded.
7. The motor protection circuit of claim 6, wherein the motor speed control module comprises a twelfth resistor, a thirteenth resistor and a second switch tube;
the second pole of the second switch tube is connected with the first voltage end, the first pole of the second switch tube is connected with the output end of the second comparator through the twelfth resistor, and the third pole of the second switch tube is connected with the motor through the thirteenth resistor.
8. The motor protection circuit of claim 7, wherein the motor speed control module further comprises a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a fifth capacitor, a sixth capacitor, a zener diode, and a second three-terminal regulator;
one end of the fourteenth resistor is connected with one end of the thirteenth resistor, which is far away from the second switching tube, one end of the fourteenth resistor is further grounded through the fifteenth resistor and the fifth capacitor in sequence, the other end of the fourteenth resistor is grounded through the sixteenth resistor, and a line between the fifteenth resistor and the fifth capacitor is connected with the motor;
the cathode of the voltage stabilizing diode is connected with one end of the fourteenth resistor, and the anode of the voltage stabilizing diode is grounded;
a first end of the second three-terminal regulator is connected with the other end of the fourteenth resistor, a second end of the second three-terminal regulator is connected with one end of the fourteenth resistor, and a third end of the second three-terminal regulator is grounded;
the sixth capacitor is connected in parallel with the fifth capacitor.
9. The motor protection circuit of claim 8 wherein said second capacitor and said fifth capacitor are electrolytic capacitors.
10. An outdoor unit of an air conditioner, comprising a motor and the motor protection circuit of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022483942.3U CN214045007U (en) | 2020-10-30 | 2020-10-30 | Motor protection circuit and air condensing units |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022483942.3U CN214045007U (en) | 2020-10-30 | 2020-10-30 | Motor protection circuit and air condensing units |
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| Publication Number | Publication Date |
|---|---|
| CN214045007U true CN214045007U (en) | 2021-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022483942.3U Active CN214045007U (en) | 2020-10-30 | 2020-10-30 | Motor protection circuit and air condensing units |
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2020
- 2020-10-30 CN CN202022483942.3U patent/CN214045007U/en active Active
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