CN112072616A - IPM over-current detection circuit and electric appliance - Google Patents
IPM over-current detection circuit and electric appliance Download PDFInfo
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- CN112072616A CN112072616A CN202010911386.7A CN202010911386A CN112072616A CN 112072616 A CN112072616 A CN 112072616A CN 202010911386 A CN202010911386 A CN 202010911386A CN 112072616 A CN112072616 A CN 112072616A
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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
- H02H7/10—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 converters; for rectifiers
- H02H7/12—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 converters; for rectifiers for static converters or rectifiers
- H02H7/122—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 converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
- H02H7/1225—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 converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters responsive to internal faults, e.g. shoot-through
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16504—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed
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Abstract
The invention discloses an IPM (intelligent power module) overcurrent detection circuit and an electric appliance, wherein the IPM overcurrent detection circuit comprises a current detection circuit, an inverter circuit, a feedback circuit and a driving circuit, the current detection circuit is used for detecting whether IPM is overcurrent or not, the inverter circuit can output an inverter signal during the overcurrent, the inverter signal can be input into the feedback circuit, a signal output to a driving chip by the feedback circuit is changed, and the IPM is turned off by the driving chip. Compared with the prior art, the IPM protection device can still turn off the IPM under the condition that the protection unit in the IPM and the control unit which sends out the PWM for controlling the IPM and the control signal for driving the chip fail at the same time, and can play a better protection effect.
Description
Technical Field
The invention relates to an electric appliance, in particular to an IPM overcurrent detection circuit and an electric appliance.
Background
In electric products, IPM (intelligent power module) is often used to invert direct current into alternating current. The IPM has a certain limit, and when the IPM is not turned off beyond the certain limit, the IPM can be exploded, and the safety of personnel and equipment is damaged. The safety work problem of IPM has been a problem widely studied in the industry. Currently, the existing IPM overcurrent protection measures rely on the protection unit inside the IPM itself to turn off the IPM and the control unit that sends out the PWM signal to control the IPM to stop sending PWM and turn off the control signal sent to the driving chip. However, if the protection unit inside the IPM itself and the control unit that sends out the PWM signal for controlling the IPM and the control signal for driving the chip fail at the same time, the IPM cannot be turned off, resulting in a safety accident.
Therefore, it is an urgent technical problem in the art to design an over-current detection circuit that can still turn off the IPM when a protection unit in the IPM itself and a control unit that sends a PWM signal for controlling the IPM and a control signal for driving a chip fail at the same time.
Disclosure of Invention
The invention provides an IPM over-current detection circuit and an electric appliance, aiming at the technical problem that in the prior art, when a protection unit in an IPM and a control unit which sends out PWM signals for controlling the IPM and control signals for driving a chip fail at the same time, the IPM cannot be turned off.
The technical scheme of the invention provides an IPM over-current detection circuit, which comprises a current detection circuit for detecting whether IPM is over-current and a drive circuit connected with the current detection circuit, wherein the drive circuit comprises a drive chip B1 connected with the IPM, the drive chip B1 is provided with an output pin group for outputting PWM signals to the IPM and an output enable input end OE for controlling the working state of the drive chip B1, and the drive chip B1 stops outputting PWM signals X1, X2 and X3 for driving three upper bridge IGBTs of the IPM to the IPM when the output enable input end OE receives a low level signal;
an inverter circuit and a feedback circuit which are connected in series are further arranged between the driving chip B1 and the current detection circuit, the inverter circuit is connected with the current detection circuit, and the feedback circuit is connected with the driving circuit;
the phase-reversing circuit outputs a phase-reversing signal when the IPM is overcurrent, and the feedback circuit receives the phase-reversing signal and then enables the level of the output enable input end OE to be changed into a low level, so that the IPM is turned off.
The current detection circuit is connected with a node UIN formed by connecting the source electrodes of the three IPM lower bridge IGBTs,
the current detection circuit includes: the current detection circuit comprises a comparator A1, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a power supply voltage U1, wherein a non-inverting input end of the comparator A1 is connected with a resistor R3 in series to serve as an overcurrent detection pin of the current detection circuit, the overcurrent detection pin is connected with the node UIN, and the overcurrent detection pin is connected with the resistor R1 in series and then grounded;
the inverting input end of the comparator A1 is connected with the ground after being connected with the resistor R2 in series, and the inverting input end of the comparator A1 is connected with the power supply voltage U1 after being connected with the resistor R4 in series;
the output end of the comparator A1 is connected with the input end of the inverting circuit.
Further, the inverter circuit comprises a resistor R6, a resistor R7, a resistor R12, a capacitor C3, a triode Q1 and a power supply voltage U2, a base electrode of the triode Q1 is connected with the resistor R6 in series to serve as an input end of the inverter circuit, an emitter electrode of the triode Q1 is connected with the resistor R7 in series and then grounded, and a collector set of the triode Q1 is connected with the power supply voltage U2;
the emitter of the triode Q1 is also connected with a resistor R12 in series, and the emitter of the triode Q1 is connected with a resistor R12 in series and then connected to an input end UOT with an overcurrent detection function of the IPM;
the capacitor C3 has one end connected between the resistor R12 and the input end UOUT, and one end connected to ground.
Further, the feedback circuit is also connected with an input terminal Z1 of a control signal sent by the control unit to the driver chip, the feedback circuit includes a resistor R8, a resistor R9, a resistor R10, a resistor R11 and a transistor Q2, the input terminal Z1 is connected in series with the resistor R9 and then connected to the output enable input terminal OE, a base of the transistor Q2 is connected in series with the resistor R11 and then connected to an emitter of the transistor Q1, an emitter of the transistor Q2 is grounded, and a collector of the transistor Q2 is connected in series with the resistor R10 and then connected to the output enable input terminal OE;
the input terminal Z1 outputs a high level signal for operating the X1, X2, and X3 of the driver chip B1, and after the transistor Q2 is turned on, the output enable input terminal OE changes from a high level to a low level, thereby turning off the IPM.
Further, the feedback circuit also comprises a resistor R8, and the input end Z1 series resistor R8 is connected to the ground.
Further, the drivingChip B1 also includes an output enable input connected to ground
Said output enable input terminal
The driving chip outputs PWM signals Y1, Y2 and Y3 for turning on three IGBTs of the IPM lower bridge at low level;
furthermore, the current detection circuit further comprises a capacitor C1 and a capacitor C2, the non-inverting input terminal of the comparator A1 is connected with the capacitor C1 in series and then connected with the ground, and the inverting input terminal of the comparator A1 is connected with the resistor R4 in series and then connected with the capacitor C2 in series and then connected with the ground.
The invention also provides an electric appliance, and the electric appliance adopts the IPM overcurrent detection circuit.
Compared with the prior art, the invention has at least the following beneficial effects:
in the case where the protection unit inside the IPM itself and the control unit that issues the PWM signal for controlling the IPM and the control signal for driving the chip fail at the same time, the IPM can still be turned off.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic circuit diagram of an IPM over-current detection circuit according to the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, 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.
Thus, a feature indicated in this specification will serve to explain one of the features of one embodiment of the invention, and does not imply that every embodiment of the invention must have the stated feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
First, each component of the circuit will be described, UIN is a node formed by connecting the sources of three lower bridge IGBTs of IPM, and UOUT is an input terminal of IPM having an overcurrent detection function. U1, U2, U3 are power supply voltages, and GND is ground reference. X1, X2, and X3 are PWM signals for controlling three IGBTs of the IPM upper bridge, and Y1, Y2, and Y3 are PWM signals for controlling three IGBTs of the IPM lower bridge. B1 is the driver chip, OE is the output enable input (active high) of the driver chip B1 that controls X1, X2, X3,
is the output enable input (active low) of the driver chip B1 controlling Y1, Y2, Y3 when OE is high and
when the level is low, the control unit may output 6 PWM signals of X1, X2, X3, Y1, Y2 and Y3 to the IPM through the driving chip B1, and when OE is low, the three PWM driving signals of the upper bridge are turned off, and even if the three driving signals of the lower bridge still have PWM signals input, the IPM will be turned off. K1, K2, K3, K4 and K5 are nodes. Z1 is the input Z1 from the control unit for the control signals to the driver chip. When the control unit is to operate the IPM, the input terminal Z1 inputs a high level. When the control unit stops the IPM, the input signal at the input end Z1 changes from high level to low level, so that the node K4 changes from high level to low levelAnd (7) flattening.
The current detection circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a comparator A1 and a power supply voltage U1. UIN is the node formed by the connection together of the sources of the three lower bridge IGBTs of the IPM, where UIN serves as the input to the over-current detection circuit, which is connected to ground through resistor R1. The role of R1 is to generate a voltage at node K1, such as when there is no R1, UIN will be directly connected to ground, and the voltage at K1 is zero. When the R1 is connected, when a current flows through the R1, the voltage at the node K1 rises, wherein a resistor R3 is connected in parallel to the node K1, and the resistor R3 is connected to the non-inverting input terminal of the comparator a1, and the other end of the resistor R3 is connected to the node K1 and connected to the UIN. A resistor R2 and a resistor R4 are further connected to the inverting input terminal of the comparator a1, wherein one end of the resistor R2 is connected to the inverting input terminal of the comparator a1, the other end is connected to ground, one end of the resistor R4 is connected to the inverting input terminal of the comparator a1, the other end is connected to the power supply voltage U1, the inverting input terminal is connected between the resistor R2 and the resistor R4, and the voltage at the inverting input terminal is the voltage between the resistor R2 and the resistor R4.
Here, the non-inverting input terminal of the comparator a1 is connected in series with the resistor R3 as the overcurrent detection pin of the current detection circuit, and it can be seen from fig. 1 that the overcurrent detection pin can detect the voltage at K1, and when the voltage at K1 rises and is greater than the voltage at the inverting input terminal, the comparator a1 will change from the output low level to the output high level.
A capacitor C1 and a capacitor C2 are connected to the non-inverting input terminal and the inverting input terminal of the comparator a1, respectively, wherein one end of the capacitor C1 is connected between the resistor R4 and the power supply voltage U1, and the other end of the capacitor C1 is connected to ground, which is used for filtering the power supply voltage U1, thereby stabilizing the voltage. The capacitor C2 has one end connected to the non-inverting input of the comparator a1 and the other end connected to ground, and is used for filtering the non-inverting input of the comparator a 1.
The inverting circuit comprises a resistor R6, a resistor R7, a resistor R12, a capacitor C3, a triode Q1 and a power supply voltage U2, the output end of a comparator A1 is connected to the base electrode of the triode Q1 in the inverting circuit through the resistor R6, the resistor R6 plays a certain current limiting role and prevents the triode Q1 from being damaged when the comparator A1 outputs high level, the collector of the triode Q1 is connected with the power supply voltage U2, and the emitter is connected to the ground through the resistor R7. When the output of comparator a1 is low, transistor Q1 is turned off, and the voltage at node K2 is 0. When the comparator a1 outputs a high level, the transistor Q1 is turned on, and the voltage at the node K2 starts rising from 0 and finally changes to a high level.
An emitter of the triode Q1 is connected with the resistor R12 in series and then connected to the input end UOUT with the overcurrent detection function of the IPM, a capacitor C3 is connected between the resistor R12 and the input end UOUT in parallel, and the capacitor C3 and the resistor R12 form a low-pass filter circuit for filtering signals input to the input end UOUT with the overcurrent detection function of the IPM. The node K3 is located between the resistor R12 and the input UOUT, and when the voltage at the node K3 exceeds the detection voltage threshold of the input UOUT with overcurrent function of the IPM, the IPM is turned off by a protection unit inside the IPM itself.
The feedback circuit comprises a resistor R8, a resistor R9, a resistor R10, a resistor R11 and a triode Q2, wherein the base electrode of the triode Q2 is connected with a resistor R11 in series and then connected to the emitter electrode of the triode Q1, and the collector electrode of the triode Q2 is connected with an output enable input end OE of a driving chip B1 of the driving circuit in series and a resistor R10 of the triode Q2 is connected with the output enable input end OE of the driving. The output enable input end OE of the driving chip B1 is connected to the input end Z1 of the control unit which sends out the control signal to the driving chip, and a resistor R9 is connected in series between the output enable input end OE of the driving chip B1 and the input end Z1. When the transistor Q2 is turned off, the output enable input OE of the driver chip B1 is directly connected to the input Z1 through the resistor R9, and the node K5 is at a high level if the node K4 is at a high level, and the node K5 is at a low level if the node K4 is at a low level. When the transistor Q2 is turned on, due to the voltage dividing effect of the resistor R10 and the transistor Q2, when the resistor R10 is much smaller than the resistor R9, the voltage level at the node K5 changes to low level regardless of whether the voltage level inputted from the input terminal Z1 is high or low.
Here, the base of the transistor Q2 is connected to the emitter of the transistor Q1 through the resistor R11, and when the transistor Q1 is turned off, the voltage at the node K2 is 0; when the transistor Q1 is turned on, the voltage at the node K2 will rise from 0 and finally change to high level, the transistor Q2 will then turn on, the node K5 will be connected to ground through the resistor R10 and the transistor Q2, and the node K5 will change to low level due to the voltage dividing effect of the resistor R10 and the transistor Q2. When the transistor Q2 is turned off, the high-low level at the node K5 is determined only by the level of the input terminal Z1, the high level at the node K5 is determined when the input terminal Z1 is high, and the low level at the node K5 is determined when the input terminal Z1 is low.
At the node K4, a pull-down resistor R8 is connected in parallel between the resistor R9 and the input terminal Z1, and the other end of the resistor R8 is connected to ground, which is used to prevent the output of the driving chip B1 from causing the input terminal OE to trigger erroneously.
Output enable input terminal of driver chip B1
Is connected to the ground because
The driver chip B1 will only output the PWM signals Y1, Y2 and Y3 for controlling the three IBGT of the IPM lower bridge when the voltage is low, and after the PWM signals are connected to the ground, the output enable input terminal can be ensured
Is constantly low. X1, X2, and X3 are PWM signals for controlling the conduction of three IGBTs of the IPM upper bridge, and when the input level of the output enable input terminal OE for controlling X1, X2, and X3 changes from high level to low level, the three IBGTs of the IPM upper bridge stop conducting, and the IPM is turned off. The driver chip B1 also has an input pin connected to the power supply voltage U3.
When the IPM is over-current due to the resistor R1 when the over-current detection circuit is operating normally, the voltage value at the node K1 will increase when the value of the current flowing through the node K1 increases, the voltage at the non-inverting input terminal of the comparator a1 increases, and the voltage at the inverting input terminal of the comparator a1 is determined by the resistances of the resistors R2 and R4 and the power supply voltage U1. When the voltage of the non-inverting input terminal of the comparator a1 is higher than the voltage of the inverting input terminal, the comparator a1 outputs a high level, the transistor Q1 is turned on, the voltage at the node K2 starts to increase from 0 and finally changes to the high level, and the voltage value at the node K3 also starts to increase from 0. When the voltage at the node K3 rises to exceed the detection voltage threshold of the input end UOUT with the overcurrent detection function of the IPM for a certain time, the input end UOUT with the overcurrent detection function of the IPM turns off the IPM after detecting an overcurrent signal. Meanwhile, after the triode Q1 is conducted, the base electrode of the triode Q2 is changed from low level to high level, and the triode Q2 is conducted; after the transistor Q2 is turned on, due to the voltage dividing effect of the resistor R10 and the transistor Q2, when the resistor R10 is much smaller than the resistor R9, the voltage value of the node K5 will change from high level to low level, the output enable input end OE of the driver chip B1 also changes to low level, and the IPM stops working.
When the IPM fails at the same time as the protection unit in the IPM itself and the control unit that issues a control signal for controlling the PWM and driving the chip of the IPM are disabled, the IPM is over-current, due to the existence of the resistor R1, when the current at the node K1 is over-current, the voltage at the node K1 is increased, the voltage at the non-inverting input terminal of the comparator a1 is increased, the voltage at the inverting input terminal of the comparator a1 is determined according to the resistance values of the resistors R2 and R4 and the power supply voltage U1, so the voltage at the inverting input terminal of the comparator a1 is unchanged, the voltage at the non-inverting input terminal of the comparator a1 is greater than the voltage at the inverting input terminal of the comparator a1, the comparator a1 outputs a high level, the transistor Q1 is turned on, the voltage at the node K2 is increased from 0 and finally changed to a high level, the voltage at the node K3 is increased from 0, and when the voltage at the node K3 is increased to exceed the detection voltage at the input terminal, the input end UOUT with the overcurrent detection function of the IPM detects an overcurrent signal, but at this time, a protection unit inside the IPM itself is failed, and the IPM is not turned off. Meanwhile, after the triode Q1 is conducted, the base electrode of the triode Q2 is changed from low level to high level, the triode Q2 is conducted, after the triode Q2 is conducted, due to the voltage division effect of the resistor R10 and the triode Q2, the voltage at the node K5 is changed into low level, the driving chip turns off PWM signals of three IBGT (intermediate bulk transport transistor) sent to the IPM upper bridge, and the IPM is turned off. It should be noted here that, at this time, because the control unit of the IPM itself fails, the input terminal Z1 is always at the high level, but due to the voltage dividing effect of the resistor R10 and the transistor Q2, the level at the node K5 changes to the low level no matter whether the input terminal Z1 of the control signal sent by the control unit to the driving chip outputs the low level, the control chip B1 stops sending PWM signals for controlling three IGBTs of the IPM upper bridge to the IPM, and the IPM is turned off.
Compared with the prior art, the IPM over-current detection circuit can still turn off the IPM under the condition that the protection unit in the IPM and the control unit which sends out the PWM controlling the IPM and the control signal driving the chip fail at the same time, and can effectively avoid the occurrence of safety accidents.
The invention also provides an electric appliance, and the electric appliance adopts the IPM overcurrent detection circuit.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
- The IPM overcurrent detection circuit comprises a current detection circuit for detecting whether IPM is in overcurrent or not and a drive circuit connected with the current detection circuit, and is characterized in that the drive circuit comprises a drive chip B1 connected with the IPM, the drive chip B1 is provided with an output pin group for outputting PWM signals to the IPM and an output enable input end OE for controlling the working state of the drive chip B1, and the drive chip B1 stops outputting PWM signals X1, X2 and X3 for driving three upper bridge IGBTs of the IPM to the IPM when the output enable input end OE is at a low level;an inverter circuit and a feedback circuit which are connected in series are further arranged between the driving chip B1 and the current detection circuit, the inverter circuit is connected with the current detection circuit, and the feedback circuit is connected with the driving circuit;the phase-reversing circuit outputs a phase-reversing signal when the IPM is overcurrent, and the feedback circuit receives the phase-reversing signal and then enables the level of the output enable input end OE to be changed into a low level, so that the IPM is turned off.
- 2. The IPM overcurrent detection circuit of claim 1, wherein the current detection circuit is connected to a node UIN formed by source connections of IPM three lower bridge IGBTs, the current detection circuit comprising: the current detection circuit comprises a comparator A1, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a power supply voltage U1, wherein a non-inverting input end of the comparator A1 is connected with a resistor R3 in series to serve as an overcurrent detection pin of the current detection circuit, the overcurrent detection pin is connected with the node UIN, and the overcurrent detection pin is connected with the resistor R1 in series and then grounded;the inverting input end of the comparator A1 is connected with the ground after being connected with the resistor R2 in series, and the inverting input end of the comparator A1 is connected with the power supply voltage U1 after being connected with the resistor R4 in series;the output end of the comparator A1 is connected with the input end of the inverting circuit.
- 3. The IPM overcurrent detection circuit of claim 1, wherein the inverter circuit comprises a resistor R6, a resistor R7, a resistor R12, a capacitor C3, a transistor Q1 and a supply voltage U2, a base of the transistor Q1 is connected in series with the resistor R6 as an input of the inverter circuit, an emitter of the transistor Q1 is connected in series with the resistor R7 and then to ground, and a collector of the transistor Q1 is connected to the supply voltage U2;an emitter of the triode Q1 is connected with a resistor R12 in series and then is connected to an input end UOUT with an overcurrent detection function of the IPM;the capacitor C3 has one end connected between the resistor R12 and the input end UOUT, and one end connected to ground.
- 4. The IPM overcurrent detection circuit of claim 1, wherein the feedback circuit further includes an input terminal Z1 connected to a control signal from the control unit to the driver chip, the feedback circuit includes a resistor R8, a resistor R9, a resistor R10, a resistor R11, and a transistor Q2, the input terminal Z1 is connected in series with the resistor R9 and then connected to the output enable input OE, the base series resistor R11 of the transistor Q2 and then connected to the emitter of the transistor Q1, the emitter of the transistor Q2 is grounded, and the collector series resistor R10 of the transistor Q2 and then connected to the output enable input OE;the input terminal Z1 inputs a high level signal for operating the X1, X2, and X3 of the driver chip B1 and a low level signal for stopping the X1, X2, and X3 of the driver chip B1, and the output enable input terminal OE changes from a high level to a low level after the transistor Q2 is turned on.
- 5. The IPM overcurrent detection circuit of claim 4, wherein the feedback circuit further comprises a resistor R8, the input terminal Z1 series resistor R8 being connected to ground.
- 6. The IPM overcurrent detection circuit of claim 1, wherein the driver chip B1 further comprises an output enable input terminal connected to groundSaid output enable input terminal
The driver chip outputs PWM signals Y1, Y2, Y3 for turning on the three IGBTs of the IPM lower bridge at the low level.
- 7. The IPM overcurrent detection circuit of claim 2, further comprising a capacitor C1 and a capacitor C2, wherein a non-inverting input terminal of the comparator a1 is connected in series with the capacitor C1 and then to ground, and wherein an inverting input terminal of the comparator a1 is connected in series with the resistor R4 and then in series with the capacitor C2 and then to ground.
- 8. An electric appliance employing the IPM overcurrent detection circuit according to any one of claims 1 to 7.
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| CN202010911386.7A CN112072616B (en) | 2020-09-02 | 2020-09-02 | IPM over-current detection circuit and electric appliance |
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| CN202010911386.7A CN112072616B (en) | 2020-09-02 | 2020-09-02 | IPM over-current detection circuit and electric appliance |
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| CN112072616B (en) | 2021-09-14 |
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