CN217215957U - Overcurrent protection circuit and electronic equipment - Google Patents
Overcurrent protection circuit and electronic equipment Download PDFInfo
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- CN217215957U CN217215957U CN202221061106.9U CN202221061106U CN217215957U CN 217215957 U CN217215957 U CN 217215957U CN 202221061106 U CN202221061106 U CN 202221061106U CN 217215957 U CN217215957 U CN 217215957U
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Abstract
The application provides an overcurrent protection circuit and electronic equipment, and relates to the technical field of overcurrent protection. The overcurrent protection circuit comprises a rectifying module, an inverting module, a controller, a current detection module and an overcurrent latch module, wherein the controller is respectively and electrically connected with the inverting module, the current detection module and the latch module; the current detection module is used for detecting the current of the inversion module and outputting a detection current; the controller is used for controlling the operation of the inversion module according to the detection current; when the detected current is larger than the threshold value, the overcurrent latch module is used for latching the overcurrent signal and transmitting the overcurrent signal to the controller and the inverter module so as to control the inverter module to stop working. The application has the advantages that the compressor is prevented from being repeatedly started under the condition of overflowing again, and the compressor is not easy to damage.
Description
Technical Field
The application relates to the technical field of overcurrent protection, in particular to an overcurrent protection circuit and electronic equipment.
Background
At present, the current of the compressor commonly used by household and commercial air conditioners needs to adopt an overcurrent protection strategy so as to achieve the aim of protecting the compressor.
In the existing overcurrent protection strategy, a mode is generally adopted to control the compressor to stop running when an overcurrent signal is detected, and to control the compressor to work again when the current signal is normal.
However, the over-current signal may not be a continuous signal, but may be an intermittent signal, and the compressor may be repeatedly started, thereby causing damage to the compressor.
In summary, in the prior art, when a discontinuous overcurrent signal occurs, the compressor is repeatedly started, which results in the problem of damage to the compressor.
SUMMERY OF THE UTILITY MODEL
The application aims to provide an overcurrent protection circuit and electronic equipment to solve the problem that in the prior art, when discontinuous overcurrent signals occur, the compressor is repeatedly started to cause damage.
In order to solve the above problem, in one aspect, an embodiment of the present application provides an overcurrent protection circuit, where the overcurrent protection circuit includes a rectifier module, an inverter module, a controller, a current detection module, and an overcurrent latch module, the controller is electrically connected to the inverter module, the current detection module, and the latch module respectively, the rectifier module is electrically connected to the inverter module and the current detection module respectively, and the overcurrent latch module is also electrically connected to the current detection module and the inverter module respectively; wherein the content of the first and second substances,
the current detection module is used for detecting the current of the inversion module and outputting a detection current;
the controller is used for controlling the operation of the inversion module according to the detection current;
when the detection current is larger than the threshold value, the overcurrent latch module is used for latching the overcurrent signal and transmitting the overcurrent signal to the controller and the inverter module so as to control the inverter module to stop working.
Because the overcurrent latch module is arranged in the overcurrent protection circuit, when an overcurrent signal occurs, the overcurrent latch module can latch the overcurrent signal, at the moment, even if the overcurrent signal is a discontinuous signal, the inverter module can be continuously disconnected, and the compressor does not work all the time until the compressor is unlocked. Therefore, the repeated starting of the compressor is avoided, and the compressor is not easy to damage.
Optionally, the overcurrent latch module includes an overcurrent latch unit and a signal feedback unit, the overcurrent latch unit is electrically connected to the current detection module, the signal feedback unit and the inverter module, respectively, and the signal feedback unit is further electrically connected to the controller; wherein the content of the first and second substances,
the overcurrent latch unit is used for latching an overcurrent signal and controlling the inverter module to stop working when the detection current is greater than a threshold value;
the signal feedback unit is used for feeding back an overcurrent signal to the controller.
Optionally, the overcurrent latch unit includes a first comparator, a first reference voltage input component, an input resistor, and a latch component, a non-inverting input terminal of the first comparator is electrically connected to the first reference voltage input component, an inverting input terminal of the first comparator is electrically connected to the current detection module through the input resistor, an output terminal of the first comparator is electrically connected to the latch component, the signal feedback unit, and the inverter module, respectively, and the latch component is further electrically connected to the non-inverting input terminal of the first comparator.
Optionally, the latch component includes a first resistor and a first diode, one end of the first resistor is connected to a power supply, the other end of the first resistor is electrically connected to the output end of the first comparator, the anode of the first diode is electrically connected to the output end of the first comparator, and the cathode of the first diode is electrically connected to the non-inverting input end of the first comparator.
Optionally, the overcurrent latch unit further includes a second diode, an anode of the second diode is electrically connected to the output terminal of the first comparator, and a cathode of the second diode is electrically connected to the controller; wherein the content of the first and second substances,
after the overcurrent latch unit latches the overcurrent signal, the controller is used for unlocking the overcurrent latch unit through the second diode.
Optionally, the signal feedback unit includes a second comparator and a second reference voltage input component, a non-inverting input terminal of the second comparator is electrically connected to the second reference voltage input component, an inverting input terminal of the second comparator is electrically connected to the output terminal of the over-current latch unit, and an output terminal of the second comparator is electrically connected to the controller.
Optionally, the current detection module includes an operational amplifier, a sampling resistor, a feedback resistor, and a third reference voltage input component, a non-inverting input terminal of the operational amplifier is electrically connected to the inversion module through the sampling resistor, an inverting input terminal of the operational amplifier is electrically connected to the third reference voltage input component, an input of the operational amplifier is electrically connected to the controller and the overcurrent latch module, and two ends of the feedback resistor are connected to the non-inverting input terminal and the output terminal of the operational amplifier.
Optionally, the rectifier module comprises a rectifier bridge.
Optionally, the inverter module includes a plurality of drivers and switching tubes, each driver is electrically connected to the controller, the overcurrent latch module, and a control end of the switching tube, and the plurality of switching tubes form an inverter bridge.
On the other hand, an embodiment of the present application further provides an electronic device, where the electronic device includes the overcurrent protection circuit.
Drawings
Fig. 1 is a circuit diagram of an overcurrent protection circuit in the prior art.
Fig. 2 is a schematic block diagram of an overcurrent protection circuit according to an embodiment of the present application.
Fig. 3 is a schematic block diagram of another overcurrent protection circuit according to an embodiment of the present application.
Fig. 4 is a schematic circuit diagram of an overcurrent protection circuit according to an embodiment of the present application.
Description of reference numerals: 100-an overcurrent protection circuit; 110-a rectifying module; 120-an inverter module; 130-a controller; 140-a current detection module; 150-an over-current latch module; 151-an over-current latch unit; 152-a signal feedback unit; d12 — first diode; d15 — second diode; IC 3B-operational amplifier; r1-sample resistance; RE0 — feedback resistance; RF1 — input resistance; RF6 — first resistance; U9A — second comparator; U9B — first comparator.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below.
As described in the background, the current over-current signal may not be a continuous signal, but may be an intermittent signal, so that the compressor may be repeatedly started when the over-current protection of the compressor is performed, thereby causing the damage of the compressor.
For example, referring to fig. 1, fig. 1 shows a schematic diagram of an overcurrent protection circuit for a compressor phase current in the prior art, in fig. 1, a sampling resistor R1 samples a compressor current and sends a sampled voltage (V1) to a non-inverting input terminal (pin 5) of an operational amplifier, while an inverting input terminal (pin 6) of the operational amplifier is connected to a voltage dividing circuit, and outputs a corresponding voltage to the inverting input terminal of the operational amplifier through voltage dividing resistors R3 and R4, and meanwhile, the inverting input terminal of the operational amplifier is grounded through a resistor R2. The output end (7 feet) of the operational amplifier (U1B) is connected with a certain port of the singlechip, when the port of the singlechip receives an output signal of the operational amplifier (U1B), the singlechip outputs corresponding PWM pulse to correspondingly control the IGBT in the inverter bridge so as to output corresponding alternating current, thereby realizing the variable frequency speed regulation of the compressor (M).
When the current passing through the compressor is too large (for example, a demagnetization protection situation occurs), the output of the operational amplifier (U1B) is connected with the inverting input (pin 6) of the comparator (U2B), the non-inverting input end of the comparator (U2B) is connected with a voltage division circuit, the voltage division circuit comprises voltage division resistors R7 and R8, the voltage division circuit provides reference voltage for the non-inverting input end of the operational amplifier, when an overcurrent situation occurs, the voltage of the inverting input end of the comparator is increased, the voltage of the inverting input end is larger than that of the non-inverting input end, the comparator outputs low level to the corresponding pin of the single chip microcomputer, then the single chip microcomputer stops outputting PWM pulse, an IGBT in an inverter bridge is turned off, and the compressor stops running.
Overcurrent protection can be achieved by the circuit shown in fig. 1, but in this circuit, when the overcurrent signal suddenly disappears, the comparator malfunctions, and the output level signal is the same as that of the compressor in normal operation, causing the compressor to be repeatedly started. For example, when the over-current signal is a discrete signal, rather than a continuous signal, as in the case of the 1 st S, the over-current condition occurs, and in the case of the 2 nd S, the normal condition is recovered; at time 3S, however, an over-current condition … occurs again. In the case of the above example, the comparison shown in fig. 1 continuously outputs the low level and the high level, which causes the compressor to be repeatedly started and shut down, and in case of serious, may cause the compressor to be damaged.
In view of this, the present application provides an overcurrent protection circuit, which, by means of the overcurrent latch module, ensures that the compressor is not repeatedly turned on and off after an overcurrent signal occurs, thereby achieving the purpose of protecting the compressor.
The following provides an exemplary description of the overcurrent protection circuit provided in the present application:
referring to fig. 2, as an optional implementation manner, the overcurrent protection circuit 100 includes a rectifying module 110, an inverting module 120, a controller 130, a current detection module 140, and an overcurrent latch module 150, where the controller 130 is electrically connected to the inverting module 120, the current detection module 140, and the latch module respectively, the rectifying module 110 is electrically connected to the inverting module 120 and the current detection module 140 respectively, and the overcurrent latch module 150 is further electrically connected to the current detection module 140 and the inverting module 120 respectively. The rectifier module 110 is configured to convert ac power into dc power, the current detection module 140 is configured to detect current of the inverter module 120 and output the detected current, the controller 130 is configured to control the inverter module 120 according to the detected current, and the output of the inverter module 120 may be connected to a compressor, so as to implement frequency conversion control on the compressor. When the detected current is greater than the threshold, the overcurrent latch module is configured to latch the overcurrent signal and transmit the overcurrent signal to the controller 130 and the inverter module 120 to control the inverter module 120 to stop working.
Through the overcurrent protection circuit 100 provided by the application, once the overcurrent condition occurs, the overcurrent latch module 150 can latch the overcurrent state, the compressor can keep the idle state at the moment, even though discontinuous overcurrent signals occur, the repeated starting of the compressor can not occur, and only after the compressor is unlocked, the compressor can work again, so that the problem that the compressor is damaged due to repeated starting is avoided.
As an optional implementation manner, please refer to fig. 3, the overcurrent latch module 150 includes an overcurrent latch unit 151 and a signal feedback unit 152, the overcurrent latch unit 151 is electrically connected to the current detection module 140, the signal feedback unit 152 and the inverter module 120, respectively, and the signal feedback unit 152 is further electrically connected to the controller 130; the overcurrent latch unit 151 is configured to latch the overcurrent signal and control the inverter module 120 to stop working when the detected current is greater than the threshold; the signal feedback unit 152 is used for feeding back the overcurrent signal to the controller 130.
In one implementation, referring to fig. 4, the over-current latch unit 151 includes a first comparator U9B, a first reference voltage input element, an input resistor RF1, and a latch element, wherein a non-inverting input terminal of the first comparator U9B is electrically connected to the first reference voltage input element, an inverting input terminal of the first comparator U9B is electrically connected to the current detection module 140 through the input resistor RF1, an output terminal of the first comparator U9B is electrically connected to the latch element, the signal feedback unit 152, and the inverter module 120, and the latch element is further electrically connected to a non-inverting input terminal of the first comparator U9B.
The latch assembly comprises a first resistor RF6 and a first diode D12, wherein one end of the first resistor RF6 is connected with a power supply, the other end of the first resistor RF6 is electrically connected with the output end of the first comparator U9B, the anode of the first diode D12 is electrically connected with the output end of the first comparator U9B, and the cathode of the first diode D12 is electrically connected with the non-inverting input end of the first comparator U9B. The first reference voltage input assembly is used for providing a first reference voltage, and includes a second resistor RH7 and a third resistor RH9, a voltage dividing circuit can be formed by the second resistor RH7 and the third resistor RH9, and a voltage input to the non-inverting input terminal of the first comparator U9B can be determined by setting a resistance ratio between the second resistor RH7 and the third resistor RH 9. In addition, in order to ensure the stability of the voltage input to the non-inverting input terminal, the first reference voltage input module further includes a capacitor C97, one end of the capacitor C97 is electrically connected to the non-inverting input terminal of the first comparator U9B, and the other end is grounded.
It can be understood that the operation principle of the over-current latch unit 151 is as follows:
when the compressor works normally, the voltage of the non-inverting input terminal of the first comparator U9B is greater than the voltage of the inverting input terminal, and the first comparator U9B outputs a bottom level. Once an overcurrent condition occurs, the first comparator U9B turns over, and at this time, when the output of the first comparator U9B is at a high level and drives the inverter module 120 to turn off, and meanwhile, since the output end of the first comparator U9B is connected to the non-inverting input end through the first diode D12, the high level output by the first comparator U9B loads the non-inverting input end of the first comparator U9B, so that the voltage at the non-inverting input end of the first comparator U9B is further raised. At this time, even if the overcurrent signal disappears, the voltage at the inverting input terminal of the first comparator U9B rises, but the non-inverting input terminal of the first comparator U9B is still higher than the inverting input terminal, so the first comparator U9B continues to output a high level, and the overcurrent signal is latched. During the period, even if the overcurrent signal is a discontinuous signal, the output high level of the comparator cannot be influenced, and the compressor cannot be started repeatedly.
In addition, in order to unlock after latching, the overcurrent latch unit 151 further includes a second diode D15, an anode of the second diode D15 is electrically connected to the output terminal of the first comparator U9B, and a cathode is electrically connected to the controller 130; after the overcurrent latch unit 151 latches the overcurrent signal, the controller 130 is configured to unlock the overcurrent latch unit 151 through the second diode D15.
Since the output end of the first comparator U9B continuously outputs a high level, and the high level of the input end acts on the non-inverting input end of the first comparator U9B through the first diode D12, when the unlocking is required, only the port where the controller 130 and the second diode D15 are correspondingly connected needs to output a low level, the voltage of the output end of the first comparator U9B acts on the loop of the second diode D15, and does not act on the non-inverting input end of the first comparator U9B, and the state that the voltage of the inverting input end is greater than the non-inverting input end is restored again, so that the unlocking is realized.
It should be noted that the controller 130 provided in the present application may be a controller 130 such as a single chip, which is not limited thereto. In addition, after the overcurrent condition occurs, a user can unlock through the controller 130 after confirming that the current is stable, and the damage to the compressor can be effectively prevented.
As one implementation, the signal feedback unit 152 includes a second comparator U9A and a second reference voltage input component, a non-inverting input terminal of the second comparator U9A is electrically connected to the second reference voltage input component, an inverting input terminal of the second comparator U9A is electrically connected to the output terminal of the over-current latch unit 151, and an output terminal of the second comparator U9A is electrically connected to the controller 130.
Referring to fig. 4, the second reference voltage input device includes a voltage divider circuit formed by a fourth resistor RH6 and a fifth resistor RH3, and the input voltage of the non-inverting input terminal of the second comparator U9A can be adjusted by adjusting the resistance ratio of the fourth resistor RH6 to the fifth resistor RH3, and meanwhile, a capacitor C77 is added for filtering in order to stabilize the input signal.
When the compressor is working normally and the first comparator U9B outputs a low level, the voltage at the non-inverting input terminal of the second comparator U9A is greater than the voltage at the inverting input terminal of the second comparator U9A, so the second comparator U9A outputs a high level and feeds back the high level to the controller 130. When an overcurrent condition occurs, the first comparator U9B outputs a high level, and at this time, the voltage at the non-inverting input terminal of the second comparator U9A is smaller than the voltage at the inverting input terminal of the second comparator U9A, so that the second comparator U9A outputs a low level and feeds back the low level to the controller 130, and the controller 130 controls the inverter module 120 to be completely turned off after receiving the overcurrent signal.
As an implementation manner, the rectifying module 110 includes a rectifying bridge, and the rectifying bridge includes 6 rectifying diodes, which is not described herein. The inverter module 120 includes a plurality of drivers and switching tubes, each driver is electrically connected to the controller 130, the overcurrent latch module 150, and a control end of the switching tube, and the plurality of switching tubes form an inverter bridge. The number of the switching tubes and the number of the drivers are 6, the types of the switching tubes are not limited in the application, and for example, the switching tubes may be IGBTs, triodes, field effect tubes, or the like.
Optionally, the current detection module 140 includes an operational amplifier IC3B, a sampling resistor R1, a feedback resistor RE0, and a third reference voltage input module, a non-inverting input terminal of the operational amplifier IC3B is electrically connected to the inverter module 120 through the sampling resistor R1, an inverting input terminal of the operational amplifier IC3B is electrically connected to the third reference voltage input module, an input of the operational amplifier IC3B is electrically connected to the controller 130 and the overcurrent latch module 150, and two ends of the feedback resistor RE0 are respectively connected to the non-inverting input terminal and the output terminal of the operational amplifier IC 3B.
The number of the resistors is not limited in the present application, for example, the sampling resistor R1 may be a plurality of resistors connected in parallel to improve the sampling accuracy, and the feedback resistor RE0 may also be a plurality of resistors connected in parallel to further adjust the amplification factor of the operational amplifier IC3B, which is not described herein.
The voltage of the overcurrent protection circuit 100 is specifically analyzed as follows:
let the non-inverting input terminal voltage (terminal 5) of the operational amplifier IC3B be U1, the inverting input terminal (terminal 6) voltage be U2, the output terminal (terminal 7) voltage be U3, the compressor overcurrent point be I, the output of the first comparator U9B be U4, and the non-inverting input terminal voltage be U5. While voltage
U2＝3.3*(RE2//RE8/(RE2//RE8+RE7))＝(RE2*RE8)/(RE2*RE8+RE7*RE2+RE7*RE8)*3.3V
According to the concept of the virtual short of the operational amplifier IC3B, there are:
U1＝U2＝(RE2*RE8)/(RE2*RE8+RE7*RE2+RE7*RE8)*3.3V
according to the concept of the virtual break of the operational amplifier IC3B, there are:
(U3-U1)/RE0＝(U1-I*R1)/RE5
namely: output U3 ═ (RE5+ RE0)/RE5 ═ U1- (RE0 × R1)/RE5 ═ I
＝(RE5+RE0)*RE2*RE8/(RE5*(RE2*RE8+RE7*RE2+RE7*RE8))-(RE0*R1)/RE5*I
When the first diode D12 is not conducting, the voltage at the non-inverting input terminal (pin 5) of the first comparator U9B is
U5＝3.3*RH7/(RH7+RH9)
When the current of the compressor is too large, i.e. over-magnetic protection occurs, the inverting input terminal of the first comparator U9B (the voltage U3 at the 6 terminal is less than U5, the first comparator U9B outputs high voltage, the first diode D12 is turned on, the voltage of U5 increases, the voltage is made to be U51, and then:
(3.3-U51)/RH9+(5-0.7)/RF6＝U51/RH7
U51＝(4.3*RH9*RH7+3.3*RF6*RH7)/(RH9*RF6+RF6*RH7)>(RE5+RE0)*
RE2 × RE8/(RE5 × RE2 × RE8+ RE7 × RE2+ RE7 × RE8) - (RE0 × R1)/RE5 × I realizes a latch function.
Based on the above, the operating principle of the over-current protection circuit 100 provided by the present application is:
when three-phase power is input from an R, S, T end, a rectifier bridge (comprising D1, D2, D3, D4, D5 and D6) converts the three-phase power into direct current, the output of the direct current is stabilized through an electrolytic capacitor E1 and then connected with an inverter bridge (comprising IGBT1, IGBT2, IGBT3, IGBT4, IGBT5 and IGBT6), the output of the inverter bridge is connected with a compressor M, and a sampling resistor R1 is connected with an emitter of a lower bridge of the inverter bridge. When the compressor normally operates, the sampling resistor R1 sends the acquired current signal to the non-inverting input terminal (pin 5) of the operational amplifier IC3B through the resistor RE5, the inverting input terminal of the operational amplifier IC3B is composed of resistors RE2, RE7 and RE8, the capacitor C92 is used for filtering out high-frequency interference, the output terminal of the operational amplifier IC3B is connected with the non-inverting input terminal through the feedback resistor RE0 (the resistor RE5 and the capacitor C92 form an RC filter circuit), the output terminal of the RC filter circuit is connected with the controller 130, the controller 130 outputs corresponding PWM pulses to be sent to the driver 1, the driver 2, the driver 3, the driver 4, the driver 5 and the driver 6, and the inverter bridge operates to realize the variable-frequency speed regulation of the compressor.
When the current passing through the compressor is large (when demagnetization protection occurs), the output of the operational amplifier IC3B is connected with the input end (pin 6) of the first comparator U9B, at the moment, the voltage of the non-inverting input end (pin 5) of the first comparator U9B is larger than the voltage of the inverting input end (pin 6), the output signal (EN-PWM) of the first comparator U9B becomes 1-high level, 6 drivers execute actions, the compressor stops running, and the rapid protection of the compressor is realized. Meanwhile, the output of the first comparator U9B is connected to the inverting input terminal (pin 2) of the second comparator U9A, at this time, the voltage of the in-phase terminal (pin 3) of the second comparator U9A is smaller than the voltage of the inverting terminal (pin 2), the pin U9A of the second comparator outputs a 0-low level signal (FO), which is sent to the controller 130, and the controller 130 stops outputting PWM pulses, thereby achieving complete shutdown of the inverter bridge. Meanwhile, the first comparator U9B can realize the latch and unlock functions through the first diode D12 and the second diode D15. When the voltage of the reverse phase terminal of the first comparator U9B is less than the voltage of the non-phase terminal, the first comparator U9B outputs 1, the voltage is sent to the terminal 5 through the first diode D12, the voltage of the terminal 5 begins to rise, the difference between the voltage of the terminal 5 and the voltage of the terminal 6 is further increased, and the output is more stable. When the over-current signal disappears suddenly, the first comparator U9B outputs 1 all the time because the output of the first comparator U9B is connected with the 5-end voltage through the first diode D12, and the minimum value of the 5-end voltage is always larger than the maximum value of the 6-end voltage, so that self-locking is realized. The latching high signal is cleared only when the controller 130 gives a low signal CLR.
Based on the foregoing implementation manner, an embodiment of the present application further provides an electronic device, where the electronic device includes the above overcurrent protection circuit 100, where the application does not limit the type of the electronic device, and for example, the electronic device may be an air conditioner.
In summary, the present application provides an overcurrent protection circuit and an electronic device, the overcurrent protection circuit includes a rectification module, an inversion module, a controller, a current detection module and an overcurrent latch module, the controller is electrically connected to the inversion module, the current detection module and the latch module respectively, the rectification module is electrically connected to the inversion module and the current detection module respectively, and the overcurrent latch module is also electrically connected to the current detection module and the inversion module respectively; the current detection module is used for detecting the current of the inversion module and outputting a detection current; the controller is used for controlling the operation of the inversion module according to the detection current; when the detected current is larger than the threshold value, the overcurrent latch module is used for latching the overcurrent signal and transmitting the overcurrent signal to the controller and the inverter module so as to control the inverter module to stop working. Because the overcurrent latch module is arranged in the overcurrent protection circuit, when an overcurrent signal occurs, the overcurrent latch module can latch the overcurrent signal, at the moment, even if the overcurrent signal is a discontinuous signal, the inverter module can be continuously disconnected, and the compressor does not work all the time until the compressor is unlocked. Therefore, the repeated starting of the compressor is avoided, and the compressor is not easy to damage.
Although the present application is disclosed above, the present application is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present disclosure, and it is intended that the scope of the present disclosure be defined by the appended claims.
Claims (10)
1. An overcurrent protection circuit (100), wherein the overcurrent protection circuit (100) comprises a rectifier module (110), an inverter module (120), a controller (130), a current detection module (140) and an overcurrent latch module (150), the controller (130) is electrically connected with the inverter module (120), the current detection module (140) and the latch module respectively, the rectifier module (110) is electrically connected with the inverter module (120) and the current detection module (140) respectively, and the overcurrent latch module (150) is also electrically connected with the current detection module (140) and the inverter module (120) respectively; wherein the content of the first and second substances,
the current detection module (140) is used for detecting the current of the inversion module (120) and outputting a detection current;
the controller (130) is used for controlling the operation of the inversion module (120) according to the detection current;
when the detection current is larger than the threshold value, the overcurrent latch module is used for latching the overcurrent signal and transmitting the overcurrent signal to the controller (130) and the inverter module (120) so as to control the inverter module (120) to stop working.
2. The overcurrent protection circuit (100) according to claim 1, wherein the overcurrent latch module (150) comprises an overcurrent latch unit (151) and a signal feedback unit (152), the overcurrent latch unit (151) is electrically connected to the current detection module (140), the signal feedback unit (152) and the inverter module (120), respectively, and the signal feedback unit (152) is further electrically connected to the controller (130); wherein the content of the first and second substances,
the overcurrent latch unit (151) is used for latching an overcurrent signal and controlling the inverter module (120) to stop working when the detection current is greater than a threshold value;
the signal feedback unit (152) is used for feeding back an overcurrent signal to the controller (130).
3. The overcurrent protection circuit (100) as set forth in claim 2, wherein the overcurrent latch unit (151) comprises a first comparator (U9B), a first reference voltage input component, an input resistor (RF1) and a latch component, a non-inverting input terminal of the first comparator (U9B) is electrically connected to the first reference voltage input component, an inverting input terminal of the first comparator (U9B) is electrically connected to the current detection module (140) through the input resistor (RF1), an output terminal of the first comparator (U9B) is electrically connected to the latch component, the signal feedback unit (152) and the inversion module (120), respectively, and the latch component is further electrically connected to a non-inverting input terminal of the first comparator (U9B).
4. The overcurrent protection circuit (100) as set forth in claim 3, wherein the latch component comprises a first resistor (RF6) and a first diode (D12), the first resistor (RF6) is connected to a power supply at one end and electrically connected to an output of the first comparator (U9B) at the other end, an anode of the first diode (D12) is electrically connected to an output of the first comparator (U9B), and a cathode of the first diode is electrically connected to a non-inverting input of the first comparator (U9B).
5. The overcurrent protection circuit (100) as set forth in claim 4, wherein the overcurrent latch unit (151) further comprises a second diode (D15), an anode of the second diode (D15) is electrically connected to the output terminal of the first comparator (U9B), and a cathode of the second diode is electrically connected to the controller (130); wherein the content of the first and second substances,
after the overcurrent latch unit (151) latches the overcurrent signal, the controller (130) is configured to unlock the overcurrent latch unit (151) through the second diode (D15).
6. The overcurrent protection circuit (100) as set forth in claim 2, wherein the signal feedback unit (152) comprises a second comparator (U9A) and a second reference voltage input component, a non-inverting input of the second comparator (U9A) is electrically connected to the second reference voltage input component, an inverting input of the second comparator (U9A) is electrically connected to the output of the overcurrent latch unit (151), and an output of the second comparator (U9A) is electrically connected to the controller (130).
7. The overcurrent protection circuit (100) as set forth in claim 1, wherein the current detection module (140) comprises an operational amplifier (IC3B), a sampling resistor (R1), a feedback resistor (RE0) and a third reference voltage input component, a non-inverting input terminal of the operational amplifier (IC3B) is electrically connected to the inverter module (120) through the sampling resistor (R1), an inverting input terminal of the operational amplifier (IC3B) is electrically connected to the third reference voltage input component, an input of the operational amplifier (IC3B) is electrically connected to the controller (130) and the overcurrent latch module (150), and two ends of the feedback resistor (RE0) are respectively connected to the non-inverting input terminal and the output terminal of the operational amplifier (IC 3B).
8. The overcurrent protection circuit (100) as set forth in claim 1, wherein the rectifier module (110) comprises a rectifier bridge.
9. The overcurrent protection circuit (100) as set forth in claim 1, wherein the inverter module (120) comprises a plurality of drivers and switching tubes, each of the drivers is electrically connected to the controller (130), the overcurrent latch module (150) and a control end of the switching tube, and the plurality of switching tubes form an inverter bridge.
10. An electronic device, characterized in that it comprises an overcurrent protection circuit (100) as set forth in any one of claims 1 to 9.
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| CN202221061106.9U CN217215957U (en) | 2022-04-28 | 2022-04-28 | Overcurrent protection circuit and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115642564A (en) * | 2022-10-27 | 2023-01-24 | 瑶芯微电子科技(上海)有限公司 | Overcurrent protection circuit and chip |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115642564A (en) * | 2022-10-27 | 2023-01-24 | 瑶芯微电子科技(上海)有限公司 | Overcurrent protection circuit and chip |
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