CN111525518A - Air conditioner - Google Patents
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- CN111525518A CN111525518A CN202010388665.XA CN202010388665A CN111525518A CN 111525518 A CN111525518 A CN 111525518A CN 202010388665 A CN202010388665 A CN 202010388665A CN 111525518 A CN111525518 A CN 111525518A
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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
Abstract
The invention discloses an air conditioner, which comprises a sampling circuit, a power module and a control circuit, wherein the sampling circuit is used for sampling the current of the power module; the comparison circuit is used for comparing the current acquired and output by the sampling circuit with a reference value and outputting a comparison signal according to a comparison result; the self-locking circuit receives the comparison signal output by the comparison circuit and is used for locking the comparison signal when the power module has overcurrent; a lock execution circuit which receives the comparison signal output by the comparison circuit; an unlock circuit for unlocking the comparison signal; and the power module driving circuit is used for receiving the comparison signal output by the comparison circuit. The air conditioner adopts the hardware circuit to directly carry out turn-off protection on the power module, has high response speed and avoids damage caused by untimely turn-off. The comparison signal is locked by arranging the self-locking circuit, so that the problem that the power module is repeatedly impacted due to unstable overturn of an overcurrent signal is avoided, and the reliability of protection of the power module is further improved.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to an air conditioner.
Background
In the field of variable frequency air conditioners, a power module of a variable frequency drive board is used for controlling the on-off state of each phase circuit of a compressor to realize variable frequency regulation.
When the power module generates overcurrent, the power module needs to be timely turned off within the range required by a safe working area, otherwise, the power module is burnt out. The shutdown protection is effective within 10us according to the specification of the mainstream power module. Damage to the power module due to untimely shutdown is common.
The protection methods commonly used at present mainly comprise two methods: (1) the control unit collects current and voltage through the sampling circuit and sets a protection value through software to carry out software protection. Because a phase current reconstruction method is adopted, a filtering algorithm is adopted, and a real-time acquired signal has time delay, so that the risk of untimely protection exists in software protection. (2) And by arranging the first comparator overturning circuit, when the sampling current and the sampling voltage reach the set reference values, the first comparator overturns and outputs a Fo signal to the control unit. Since the overcurrent and voltage protection is performed by only cutting off the PWM wave by the control unit, the output level is not locked when the protection is performed, and thus the power module is operated after the instantaneous overcurrent disappears, and there is a possibility that the power module is repeatedly impacted when the overcurrent is jittered.
Disclosure of Invention
The invention provides an air conditioner, which can lock a protection signal output during overcurrent, avoid repeatedly impacting a power module and improve the protection reliability, and aims to solve the problems that a protection module in the existing air conditioner only turns off a protection power module when overcurrent occurs, and the power module is immediately turned on when overcurrent is relieved, and the power module is repeatedly impacted when the overcurrent fluctuates.
In order to achieve the purpose, the invention adopts the following technical scheme:
the present invention provides an air conditioner, comprising:
a sampling circuit for sampling a current of the power module;
the comparison circuit is used for comparing the current acquired and output by the sampling circuit with a reference value and outputting a comparison signal according to a comparison result;
the self-locking circuit receives the comparison signal output by the comparison circuit and is used for locking the comparison signal when the power module has overcurrent;
the locking execution circuit receives the comparison signal output by the comparison circuit, and outputs a protection signal to the power module when the power module has overcurrent;
an unlock circuit for unlocking the comparison signal;
and the power module driving circuit is used for receiving the comparison signal output by the comparison circuit and stopping outputting the driving signal to the power module when the power module has overcurrent.
Further, the sampling circuit comprises a sampling resistor, which is used for converting the current of the sampling power module into a voltage signal and outputting the voltage signal to the comparison circuit, and the reference value is a reference voltage value.
Further, the comparison circuit comprises a first comparator, an inverting terminal of the first comparator is connected with the output terminal of the sampling circuit, and a non-inverting terminal of the first comparator inputs a reference value.
Furthermore, the self-locking circuit comprises a fourth voltage-dividing resistor and a first diode, one end of the fourth voltage-dividing resistor is connected with the direct-current power supply, the other end of the fourth voltage-dividing resistor is connected with the output end of the first comparator, the anode of the first diode is connected with the output end of the first comparator, and the cathode of the first diode is connected with the positive phase end of the first comparator.
Further, the unlocking circuit comprises a second diode, the cathode of the second diode receives the unlocking signal, and the anode of the second diode is connected with the output end of the first comparator.
Further, the lock execution circuit includes:
a first switch circuit, a first end of which is connected with the power module, and a second end of which is connected with the ground end;
and the control end of the second switch circuit receives the comparison signal output by the comparison circuit, and the output end of the second switch circuit is connected with the control end of the first switch circuit and is used for controlling the on-off state of the first switch circuit.
Further, the first switch circuit comprises an NMOS transistor, a drain of the NMOS transistor is connected to the power module, and a source of the NMOS transistor is connected to ground;
the second switch circuit comprises an NPN triode, the base electrode of the NPN triode is connected with the output end of the first comparator, one path of the collector electrode is connected with a direct current power supply through a divider resistor, the other path of the collector electrode is connected with the grid electrode of the NMOS tube, and the emitting electrode of the NPN triode is connected with the ground end.
Furthermore, the locking execution circuit is provided with a plurality of locking execution circuits, the locking execution circuits are arranged in one-to-one correspondence with the IGBTs of the power module, and the first end of the first switch circuit is connected with the grid electrodes of the IGBTs.
Further, the air conditioner further includes:
and the turnover alarm circuit receives the comparison signal output by the comparison circuit, when the power module has overcurrent, the turnover alarm circuit outputs an alarm signal to the control module, and the control module controls the power module driving circuit not to generate an output driving signal any more.
Furthermore, the turnover alarm circuit comprises a second comparator, wherein a positive phase end of the second comparator receives a second reference voltage signal, a negative phase end of the second comparator is connected with an output end of the first comparator, and an output end of the second comparator is connected with the control module.
Compared with the prior art, the technical scheme of the invention has the following technical effects: according to the air conditioner, the locking execution circuit is arranged, when the power module has overcurrent, the locking execution circuit is used for outputting the protection signal to the power module, namely, the hardware circuit is adopted to directly perform turn-off protection on the power module, the response speed is high, the requirement of the power module on the response speed of the overcurrent protection is met, and damage caused by untimely turn-off is avoided. Through setting up self-locking circuit, it is according to the comparison signal that receives, when the power module appears the overcurrent, be used for with the comparison signal locks, avoids overcurrent signal unstable upset, leads to the problem that the power module is strikeed repeatedly, further improves the reliability to power module protection.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced 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 creative efforts.
FIG. 1 is a schematic block diagram of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of one embodiment of FIG. 1;
fig. 3 is a circuit schematic of the lock execution circuit of fig. 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
Example one
An air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The compressor is used as the heart of the air conditioner, the rotating speed of the compressor directly influences the use efficiency of the air conditioner, and the inverter compressor is always in the optimal rotating speed state by controlling and adjusting the rotating speed of the compressor, so that the energy efficiency ratio is improved (at least 30% of energy is saved compared with the conventional air conditioner). The variable frequency compressor automatically carries out stepless speed change on the compressor by arranging a power module, and can automatically provide required cold (heat) according to the room condition; when the indoor temperature reaches the expected value, the air conditioner main unit operates at a constant speed capable of accurately keeping the temperature, and the non-stop operation is realized, so that the stability of the ambient temperature is ensured.
In case of unstable power supply or failure of some devices, overcurrent of current passing through the power module may occur, and if the power module is not turned off in time, the power module may be damaged.
Based on this, the present embodiment provides an air conditioner, as shown in fig. 1, including a sampling circuit, a comparing circuit, a self-locking circuit, a locking execution circuit, an unlocking circuit, and a power module driving circuit, where the sampling circuit is used to sample a current of a power module. The power module is connected with an alternating current power supply through the voltage conversion module, and can control the connection state of each phase circuit of the driving compressor and the power supply, so that variable frequency regulation is realized. The sampling circuit samples the current in the total loop of the power module, and when overcurrent occurs, the sampling circuit can sample the current in time.
The comparison circuit is used for comparing the current collected and output by the sampling circuit with a reference value and outputting a comparison signal according to a comparison result. It can be understood that by setting a reasonable reference value, under a conventional condition, the magnitude relation between the current collected and output by the sampling circuit and the reference value is constant, the comparison circuit outputs one of the comparison signals, and when the current collected and output by the sampling circuit is an overcurrent, the comparison signal is inverted, that is, the comparison signal is changed according to the magnitude relation between the current collected and output by the sampling circuit and the reference value.
The self-locking circuit receives a comparison signal output by the comparison circuit and is used for locking the comparison signal when the power module has overcurrent; the self-locking circuit is connected with the comparison circuit, the input end of the self-locking circuit is connected with the output end of the comparison circuit, the self-locking circuit is used for receiving the comparison signal output by the comparison circuit, when overcurrent occurs, the comparison signal output by the comparison circuit triggers the self-locking circuit to output a locking signal, the comparison signal output by the comparison circuit is used for locking, the comparison circuit can be controlled to keep outputting the current comparison signal, the self-locking circuit can generate a signal consistent with the current comparison signal to be used as the comparison signal to keep outputting, and even if the comparison signal output by the comparison circuit is inverted, the output signal of the self-locking circuit is kept, and the comparison signal can be locked. The self-locking circuit of the embodiment is not limited to a simple implementation form of a certain circuit structure, and similar schemes are adopted to implement the same function, which all belong to the protection scope of the patent.
The locking execution circuit receives a comparison signal output by the comparison circuit, and when the power module has overcurrent, the locking execution circuit outputs a protection signal to the power module; the input end of the locking execution circuit is connected with the output end of the comparison circuit and used for receiving the comparison signal output by the comparison circuit, and when overcurrent occurs, the comparison signal output by the comparison circuit triggers the locking execution circuit to output a protection signal to the power module and is used for protecting the power module. The protection signal may be to discharge current in the power module to prevent overcurrent from damaging the power module, or to turn off power connection of the power module.
When the overcurrent disappears and is stable, the locking of the comparison signal by the locking module should be released, so that the power module returns to normal control, and therefore, the air conditioner of the embodiment further comprises an unlocking circuit, wherein the unlocking circuit is used for unlocking the comparison signal; the unlocking circuit receives the control of the control module, generates an unlocking signal and outputs the unlocking signal to the comparison circuit for turning over the currently output comparison signal, or outputs the unlocking signal to the locking module for releasing the output locking signal, so that the currently output comparison signal is turned over.
The power module driving circuit is used for generating a driving signal, outputting the driving signal to the power module and controlling the state of the power module, the input end of the power module driving circuit is further connected with the output end of the comparison circuit and used for receiving the comparison signal output by the comparison circuit, when the power module has overcurrent, the power module driving circuit stops outputting the driving signal to the power module, and then the connection between the power module and a power supply can be cut off, the power module driving circuit stops working, and therefore the effect of protecting the power module is achieved.
The sampling circuit comprises a sampling resistor which is used for converting the current of the sampling power module into a voltage signal and outputting the voltage signal to the comparison circuit, and the reference value of the input of the corresponding comparison circuit is a reference voltage value. The comparison circuit is used for comparing the voltage signal sampled and converted by the sampling circuit with a reference voltage value and outputting a comparison result according to the comparison result.
The reference voltage value is composed of a third resistor R3, a second resistor R2 and a ninth resistor R9 which are connected in series, and the series circuit is connected between a direct current power supply power1 and the ground terminal. The sampling point of the reference voltage value is positioned between the second resistor R2 and the ninth resistor R9, and the reference voltage value is set by adjusting the resistance values of the resistors.
As shown in fig. 2, the comparing circuit includes a first comparator U1B, the circuit is designed in this embodiment to connect the inverting terminal of the first comparator U1B with the output terminal of the sampling circuit, and the non-inverting terminal of the first comparator U1B inputs the reference value. The first comparator U1B outputs a low level when the voltage value of the inverting terminal input of the first comparator U1B is greater than the voltage value of the non-inverting terminal input thereof, and otherwise outputs a high level. Then, according to the output level, a self-locking circuit, a locking execution circuit and the like are designed to be connected with the output level. Of course, the non-inverting terminal of the first comparator U1B may be connected to the output terminal of the sampling circuit, and the inverting terminal of the first comparator U1B may be input with the reference value. The control logic of the self-locking circuit, the lock execution circuit, etc. needs to be adjusted according to the overcurrent state represented by the high-low level output by the first comparator U1B. The combination mode is all the protection scope of the patent.
As shown in fig. 2, the self-locking circuit includes a fourth voltage-dividing resistor R4 and a first diode D1, one end of the fourth voltage-dividing resistor R4 is connected to the power source 1, the other end is connected to the output terminal of the first comparator U1B, the anode of the first diode D1 is connected to the output terminal of the first comparator U1B, and the cathode of the first diode D1 is connected to the non-inverting terminal of the first comparator U1B. In the initial state, the voltage at the inverting terminal of the first comparator U1B is higher than the voltage at the non-inverting terminal, and the output of the first comparator U1B is at a low level. When overcurrent occurs, the I-shunt sent by the sampling resistor is a negative level signal, the voltage at the inverting terminal of the first comparator U1B is lower than the voltage at the positive terminal, the output result of the first comparator U1B is inverted, and the output voltage at the output terminal of the first comparator U1B changes from low level to high level. The self-locking circuit is coupled to the positive end of the first comparator U1B through the first diode D1, the voltage at the positive end of the first comparator U1B is clamped and raised, the voltage difference between the positive end and the negative end of the first comparator U1 is pulled, the voltage at the positive end is always higher than the voltage at the negative end, even if the overcurrent disappears (the negative voltage superposed by the I-shunt disappears, the voltage at the negative end of the first comparator U1B is raised, but always lower than the voltage at the positive end of the first comparator U1B, because the voltage at the positive end of the first comparator U1B is raised to the difference between the power1 and the conducting voltage of the first diode D1), the output end of the first comparator U1B always keeps high level output, and the self-locking function is completed.
As shown in fig. 2, the unlocking circuit in this embodiment includes a second diode D2, a cathode of the second diode D2 is connected to the control module for receiving the unlocking signal CLR sent by the control module, and an anode of the second diode D2 is connected to the output terminal of the first comparator U1B. The second diode D2 may also be implemented by a switching element such as a switching transistor, a relay, or an analog switch.
Under normal state, the control module sends a high level signal, the second diode D2 is not conducted, when the circuit is unlocked, the control module sends a low level signal, the second diode D2 is conducted, and at the moment, the first diode D1 is not conducted, so that the positive phase end of the first comparator U1B is not clamped and raised through the first diode D1, the positive phase end of the first comparator U1B recovers the voltage reference value set by the resistors R3, R2 and R9, the locking of the comparison signal is eliminated, and the circuit returns to the initial state.
The locking execution circuit is used for determining whether to execute the output of a protection signal for protecting the power module according to the comparison signal output by the comparison circuit.
As a preferred embodiment, the lock execution circuit of this embodiment includes a first switch circuit and a second switch circuit, wherein a first terminal of the first switch circuit is connected to the power module, a second terminal of the first switch circuit is connected to the ground terminal, the first switch circuit can connect the power module to the ground terminal when the first switch circuit is turned on, and the second switch circuit can disconnect the corresponding power module from the ground terminal when the first switch circuit is turned off. The on-off state of the first switch circuit is controlled by the second switch circuit.
The control end of the second switch circuit is connected with the output end of the comparison circuit and used for receiving the comparison signal output by the comparison circuit, and the output end of the second switch circuit is connected with the control end of the first switch circuit and used for controlling the on-off state of the first switch circuit. The on-off state of the second switch circuit is controlled by the comparison signal, when the power module has overcurrent, the first comparator U1B outputs a signal to control the on-off state of the second switch circuit, outputs a control signal to the first switch circuit and controls the first switch circuit to be switched on, so that grid charges of the power module can be discharged through the first switch circuit, the power module is switched off, and the power module is protected.
The first switch circuit and the second switch circuit of this embodiment may be implemented by transistors, as long as the relationship between the on-off state and the high and low levels of the control signal and the comparison signal is set, and the protection of the power module is implemented by controlling the first switch circuit to be turned on when an overcurrent occurs.
As a preferred embodiment, as shown in fig. 3, the first switch circuit includes an NMOS transistor QP1, the drain of the NMOS transistor is connected to the power module, and the source is connected to the ground;
the second switch circuit comprises an NPN triode QN2, the base of the NPN triode QN2 is connected with the output end of the first comparator U1B, one path of the collector is connected with a direct current power supply through a divider resistor R11, the other path of the collector is connected with the grid of an NMOS transistor QP1, and the emitter of the NPN triode QN2 is connected with the ground end.
When the shut-down output by the first comparator U1B is at a high level, the NPN transistor QN2 is turned on, so that the NMOS transistor QP1 is turned on, and the gate charge of the power module is discharged.
Generally, the power module is constructed by a plurality of IGBTs, a plurality of corresponding locking execution circuits are arranged in one-to-one correspondence with the IGBTs of the power module, and the first end of the first switch circuit is connected with the grid electrode of the IGBT.
When the NMOS pipe QP1 is conducted, the gate charge of the IGBT is discharged, the gate voltage of the IGBT is forcibly pulled low, and the IGBT is forcibly turned off to be protected.
In this embodiment, the power module is constructed by 6 IGBTs as shown in fig. 1, and 6 locking execution circuits are correspondingly required to be provided and are respectively connected with the gates of the 6 IGBTs in a one-to-one correspondence manner.
In order to further improve the reliability of protection of the power module when overcurrent occurs, the air conditioner of the embodiment further includes a flipping alarm circuit, which receives the comparison signal output by the comparison circuit, when overcurrent occurs in the power module, the flipping alarm circuit outputs an alarm signal to the control module, and the control module controls the power module driving circuit not to generate an output driving signal any more. The power module stops working, thereby fundamentally solving the problem of damage of the power module.
Preferably, in this embodiment, the rollover alarm circuit includes a second comparator U1A, a positive phase terminal of the second comparator U1A receives the second reference voltage signal, a negative phase terminal of the second comparator U1A is connected to an output terminal of the first comparator U1B, and an output terminal of the second comparator U1A is connected to the control module.
The second reference voltage signal is set by resistors R5 and R8. When no overcurrent occurs, the positive phase terminal of the second comparator U1A is greater than the negative phase terminal voltage, and the output FO of the second comparator U1A is high. When overcurrent occurs, because the shut-down signal is changed from low to high, the output of the U1A is also inverted after the voltage of the negative phase end of the second comparator U1A exceeds the voltage of the positive phase end, the output level of the U1A is changed from high to low, the FO low level is sent to a control module for controlling PWM output, the control module immediately cuts off a PWM pulse output signal after detecting the low level output by the second comparator U1A, and a corresponding power module driving circuit stops working.
In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An air conditioner, comprising:
a sampling circuit for sampling a current of the power module;
the comparison circuit is used for comparing the current acquired and output by the sampling circuit with a reference value and outputting a comparison signal according to a comparison result;
the self-locking circuit receives the comparison signal output by the comparison circuit and is used for locking the comparison signal when the power module has overcurrent;
the locking execution circuit receives the comparison signal output by the comparison circuit, and outputs a protection signal to the power module when the power module has overcurrent;
an unlock circuit for unlocking the comparison signal;
and the power module driving circuit is used for receiving the comparison signal output by the comparison circuit and stopping outputting the driving signal to the power module when the power module has overcurrent.
2. The air conditioner as claimed in claim 1, wherein the sampling circuit comprises a sampling resistor for converting a current of the sampling power module into a voltage signal and outputting the voltage signal to the comparison circuit, and the reference value is a reference voltage value.
3. The air conditioner according to claim 1, wherein the comparison circuit comprises a first comparator, an inverting terminal of the first comparator is connected to the output terminal of the sampling circuit, and a non-inverting terminal of the first comparator inputs the reference value.
4. The air conditioner as claimed in claim 3, wherein the self-locking circuit comprises a fourth voltage-dividing resistor and a first diode, wherein one end of the fourth voltage-dividing resistor is connected to the dc power supply, the other end of the fourth voltage-dividing resistor is connected to the output terminal of the first comparator, the anode of the first diode is connected to the output terminal of the first comparator, and the cathode of the first diode is connected to the non-inverting terminal of the first comparator.
5. The air conditioner of claim 3, wherein the unlock circuit comprises a second diode, a cathode of the second diode receiving the unlock signal, and an anode of the second diode being connected to the output terminal of the first comparator.
6. The air conditioner according to any one of claims 1 to 5, wherein the lock execution circuit comprises:
a first switch circuit, a first end of which is connected with the power module, and a second end of which is connected with the ground end;
and the control end of the second switch circuit receives the comparison signal output by the comparison circuit, and the output end of the second switch circuit is connected with the control end of the first switch circuit and is used for controlling the on-off state of the first switch circuit.
7. The air conditioner according to claim 6, wherein the first switching circuit comprises an NMOS transistor, a drain of the NMOS transistor is connected to the power module, and a source of the NMOS transistor is connected to ground;
the second switch circuit comprises an NPN triode, the base electrode of the NPN triode is connected with the output end of the first comparator, one path of the collector electrode is connected with a direct current power supply through a divider resistor, the other path of the collector electrode is connected with the grid electrode of the NMOS tube, and the emitting electrode of the NPN triode is connected with the ground end.
8. The air conditioner according to claim 6, wherein the locking execution circuit has a plurality of locking execution circuits, the locking execution circuits are arranged in one-to-one correspondence with the IGBTs of the power modules, and the first end of the first switch circuit is connected with the grid of the IGBT.
9. The air conditioner according to any one of claims 1 to 5, further comprising:
and the turnover alarm circuit receives the comparison signal output by the comparison circuit, when the power module has overcurrent, the turnover alarm circuit outputs an alarm signal to the control module, and the control module controls the power module driving circuit not to generate an output driving signal any more.
10. The air conditioner of claim 9, wherein the rollover alarm circuit comprises a second comparator, a positive phase terminal of the second comparator receives a second reference voltage signal, a negative phase terminal of the second comparator is connected with an output terminal of the first comparator, and an output terminal of the second comparator is connected with the control module.
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| CN202010388665.XA CN111525518A (en) | 2020-05-09 | 2020-05-09 | Air conditioner |
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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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| CN102287890A (en) * | 2011-05-24 | 2011-12-21 | 上海奉天电子有限公司 | Externally controlled variable-discharge capacity compressor air conditioner controller |
| CN104600660A (en) * | 2015-01-09 | 2015-05-06 | 广东瑞德智能科技股份有限公司 | Low-power-consumption short circuit protection circuit |
| CN106711978A (en) * | 2017-01-06 | 2017-05-24 | 广东美的制冷设备有限公司 | Overcurrent protection circuit of adjustable IPM (intelligent power module), method and air conditioner |
| CN108731213A (en) * | 2018-08-16 | 2018-11-02 | 珠海恒途电子有限公司 | A kind of guard time adjusts circuit, PFC current foldback circuits and controller |
| CN108923386A (en) * | 2018-08-24 | 2018-11-30 | 奥克斯空调股份有限公司 | A kind of over current protecting self-locking circuit and air conditioner |
| CN109004620A (en) * | 2018-09-07 | 2018-12-14 | 奥克斯空调股份有限公司 | A kind of IGBT current foldback circuit and air conditioner |
| CN208707290U (en) * | 2018-09-07 | 2019-04-05 | 奥克斯空调股份有限公司 | A kind of IGBT current foldback circuit and air conditioner |
| CN110474622A (en) * | 2019-08-22 | 2019-11-19 | 海信（山东）空调有限公司 | A kind of self-locking protective circuit and air conditioner |
| CN211508593U (en) * | 2020-03-28 | 2020-09-15 | 珠海市一微半导体有限公司 | Over-current and over-voltage self-locking protection circuit and adapter |
Cited By (1)
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| 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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