CN214013855U - Overvoltage protection circuit and air conditioner - Google Patents
Overvoltage protection circuit and air conditioner Download PDFInfo
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- CN214013855U CN214013855U CN202022329614.8U CN202022329614U CN214013855U CN 214013855 U CN214013855 U CN 214013855U CN 202022329614 U CN202022329614 U CN 202022329614U CN 214013855 U CN214013855 U CN 214013855U
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Abstract
The utility model discloses an overvoltage crowbar and air conditioner, this overvoltage crowbar include comparing unit, the control unit and relay unit, wherein the first output of rectifier in the PFC circuit is connected to comparing unit's first end, comparing unit's second end is connected in proper order the control unit with the relay unit, relay unit series connection in on the live wire of PFC circuit to further improved and carried out overvoltage protection's rapidity and reliability to the air conditioner.
Description
Technical Field
The application relates to the field of air conditioner control, in particular to an overvoltage protection circuit and an air conditioner.
Background
In an outdoor controller of the variable frequency air conditioner, a PFC (Power Factor Correction) circuit is a key part for improving Power Factor of a Power supply and improving bus voltage of a driving circuit of a compressor.
At present, the overvoltage protection of the variable frequency air conditioner is mainly protected by a method of combining hardware and software, as shown in fig. 2, generally, the voltage of a direct current bus is sampled from the rear end of a PFC circuit through a divider resistor, an overvoltage protection threshold value is set in software, and when the detected voltage of the direct current bus exceeds the set threshold value, an MCU outputs a high level signal, a relay is closed to output, and a rear-stage power supply is disconnected. However, in the method, the sample is taken from the rear end of the electrolytic capacitor of the PFC circuit, on one hand, when the high voltage is detected, the rear-end device bears the high voltage and may damage the device to a certain extent, and on the other hand, the software detects that the signal exceeds the set threshold value and needs a certain time to output the control signal, so that the protection speed is relatively slow, and the software reliability is relatively high.
Therefore, how to provide an overvoltage protection circuit to further improve the rapidity and reliability of overvoltage protection for an air conditioner is a technical problem to be solved at present.
SUMMERY OF THE UTILITY MODEL
The utility model provides a current detection circuit for solve and adopt the method that hardware and software combined together to carry out air conditioner overvoltage protection among the prior art, cause the technical problem that the reliability is low, the action speed is slow.
In some embodiments of the present application, the circuit comprises a comparison unit, a control unit and a relay unit, wherein,
the comparison unit is used for generating a control signal according to the reference voltage and the sampling voltage of the direct current bus acquired from the PFC circuit;
the control unit is used for receiving the control signal and controlling a driving signal output by the MCU according to the control signal;
the relay unit is used for controlling a main loop power supply of the PFC circuit according to the driving signal;
the first end of the comparison unit is connected with the first output end of a rectifier in the PFC circuit, the second end of the comparison unit is sequentially connected with the control unit and the relay unit, and the relay unit is connected to a live wire of the PFC circuit in series.
In some embodiments of the present application, the comparison unit further includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a comparator, wherein,
the first end of the first resistor is connected to be the first end of the comparison unit, the second end of the first resistor is connected to the first end of the second resistor, the second end of the second resistor and the first end of the third resistor are connected to the in-phase input end of the comparator in a shared mode, the first end of the fourth resistor is connected to the first direct-current power supply, the second end of the fourth resistor and the first end of the fifth resistor are connected to the anti-phase input end of the comparator in a shared mode, the common joint point of the second ends of the third resistor and the fifth resistor is grounded, and the output end of the comparator is the second end of the comparison unit.
In some embodiments of the present application, the comparison unit further comprises a first capacitor and a sixth resistor, wherein,
the first end of the first capacitor, the first end of the sixth resistor and the positive power supply end of the comparator are connected with the first direct-current power supply, the second end of the sixth resistor is connected with the output end of the comparator, and the second end of the first capacitor and the negative power supply end of the comparator are grounded.
In some embodiments of the present application, the control unit further comprises a first switching transistor and a second switching transistor, wherein,
the base electrode of the first switch triode and the base electrode of the second switch triode are connected to the second end of the comparison unit in a sharing mode, the collector electrode of the first switch triode is connected with the first input end of the relay unit, the collector electrode of the second switch triode is connected with the second input end of the relay unit, and the common contact point of the emitter electrode of the first switch triode and the emitter electrode of the second switch triode is grounded.
In some embodiments of the present application, the relay unit further comprises a relay controller, a first relay, a second relay, and a seventh resistor, wherein,
the first input of relay controller does the first input of relay unit, the second input of relay controller does the second input of relay unit, the first output of relay controller is connected the first end of the coil of first relay, the second output of relay controller is connected the first end of the coil of second relay, the switch of first relay with seventh resistance is established ties in proper order on the fire line, the switch of second relay is established ties on the fire line, the second end of the coil of first relay with the second end of second relay all connects second DC power supply, seventh resistance is thermistor.
In some embodiments of the present application, the relay unit further includes a second capacitor, a first terminal of the second capacitor and a power supply terminal of the relay controller are connected to the second dc power supply in common, and a common point of a second terminal of the second capacitor and a ground terminal of the relay controller is connected to ground.
In some embodiments of the present application, a first input end of the rectifier is connected to the seventh resistor, a second input end of the rectifier is connected to a zero line of the PFC circuit, and a second output end of the rectifier is grounded.
Correspondingly, this application has still provided an air conditioner, includes as above overvoltage protection circuit, still includes:
the refrigerant circulation loop circulates the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator, the four-way valve and the pressure reducer;
the compressor is used for compressing low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharging the high-temperature and high-pressure refrigerant gas to the condenser;
an outdoor heat exchanger and an indoor heat exchanger, wherein one of the heat exchangers operates as a condenser and the other operates as an evaporator;
the four-way valve is used for controlling the flow direction of the refrigerant in the refrigerant loop so as to switch the outdoor heat exchanger and the indoor heat exchanger between the condenser and the evaporator;
an indoor environment temperature sensor for detecting an indoor environment temperature;
and the indoor coil temperature sensor is used for detecting the temperature of the indoor coil.
By applying the technical scheme, the overvoltage protection circuit comprises a comparison unit, a control unit and a relay unit, wherein the first end of the comparison unit is connected with the first output end of a rectifier in the PFC circuit, the second end of the comparison unit is sequentially connected with the control unit and the relay unit, the relay unit is connected in series with a live wire of the PFC circuit, voltage detection and protection are carried out by completely adopting a hardware circuit, sampling voltage is detected from the rear of the rectifier, a device can be protected in time and is not influenced by software reliability, and therefore the rapidity and the reliability of overvoltage protection on the air conditioner are further improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 application, 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 circuit diagram schematically showing the configuration of an air conditioner according to the embodiment.
Fig. 2 shows a schematic diagram of an overvoltage protection circuit in the prior art.
Fig. 3 shows a schematic structural diagram of an overvoltage protection circuit in an embodiment of the present invention.
Description of the reference symbols
1: an air conditioner; 2: an outdoor unit; 3: an indoor unit; 10: a refrigerant circuit; 11: a compressor; 12: a four-way valve; 13: an outdoor heat exchanger;
14: an expansion valve; 16: an indoor heat exchanger; 21: an outdoor fan; 31: an indoor fan; 32: an indoor temperature sensor; 33: indoor heat exchanger temperature sensor.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
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 application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The 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 expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.
Fig. 1 shows a circuit configuration of an air conditioner 1, and the air conditioner 1 includes a refrigerant circuit 10, and is capable of executing a vapor compression refrigeration cycle by circulating a refrigerant in the refrigerant circuit 10. The indoor unit 3 and the outdoor unit 2 are connected by a connecting pipe 4 to form a refrigerant circuit 10 in which a refrigerant circulates. The refrigerant circuit 10 includes a compressor 11, an outdoor heat exchanger 13, an expansion valve 14, an accumulator 15, and an indoor heat exchanger 16. Among them, the indoor heat exchanger 16 and the outdoor heat exchanger 13 operate as a condenser or an evaporator. The compressor 11 sucks the refrigerant from the suction port, and discharges the refrigerant compressed therein to the indoor heat exchanger 16 from the discharge port. The compressor 11 is an inverter compressor with variable capacity that performs rotational speed control by an inverter, and the four-way valve 12 switches between heating and cooling.
The outdoor heat exchanger 13 has a first inlet and a second outlet for allowing the refrigerant to flow between the refrigerant and the suction port of the compressor 11 through the accumulator 15, and the refrigerant flows between the refrigerant and the expansion valve 14. The outdoor heat exchanger 13 exchanges heat between the outdoor air and the refrigerant flowing through a heat transfer pipe (not shown) connected between the second inlet and the first inlet of the outdoor heat exchanger 13.
The expansion valve 14 is disposed between the outdoor heat exchanger 13 and the indoor heat exchanger 16. The expansion valve 14 has a function of expanding and decompressing the refrigerant flowing between the outdoor heat exchanger 13 and the indoor heat exchanger 16. The expansion valve 14 is configured to be capable of changing the opening degree, and by decreasing the opening degree, the flow path resistance of the refrigerant passing through the expansion valve 14 is increased, and by increasing the opening degree, the flow path resistance of the refrigerant passing through the expansion valve 14 is decreased. The expansion valve 14 expands and decompresses the refrigerant flowing from the indoor heat exchanger 16 to the outdoor heat exchanger 13 during the heating operation. Further, even if the states of other devices installed in the refrigerant circuit 10 do not change, when the opening degree of the expansion valve 14 changes, the flow rate of the refrigerant flowing in the refrigerant circuit 10 changes.
The indoor heat exchanger 16 has a second inlet and outlet for allowing the liquid refrigerant to flow between the expansion valve 14 and the indoor heat exchanger, and has a first inlet and outlet for allowing the gas refrigerant to flow between the compressor 11 and the discharge port. The indoor heat exchanger 16 exchanges heat between the refrigerant flowing through the heat transfer pipe connected between the second inlet and the first inlet and the second outlet of the indoor heat exchanger 16 and the indoor air.
An accumulator 15 is disposed between the outdoor heat exchanger 13 and the suction port of the compressor 11. In the accumulator 15, the refrigerant flowing from the outdoor heat exchanger 13 to the compressor 11 is separated into a gas refrigerant and a liquid refrigerant. Then, the gas refrigerant is mainly supplied from the accumulator 15 to the suction port of the compressor 11.
The outdoor unit 2 further includes an outdoor fan 21, and the outdoor fan 21 generates an airflow of outdoor air passing through the outdoor heat exchanger 13 to promote heat exchange between the refrigerant flowing through the heat transfer tubes and the outdoor air. The outdoor fan 21 is driven by an outdoor fan motor 21A capable of changing the rotation speed. The indoor unit 3 further includes an indoor fan 31, and the indoor fan 31 generates an airflow of the indoor air passing through the indoor heat exchanger 16 to promote heat exchange between the refrigerant flowing through the heat transfer tubes and the indoor air. The indoor fan 31 is driven by an indoor fan motor 31A whose rotation speed can be changed.
As described in the background art, the prior art adopts a method of combining hardware and software to perform air conditioner overvoltage protection, which causes the technical problems of low reliability and slow operation speed.
In order to solve the above problem, an embodiment of the present application provides an overvoltage protection circuit, including a comparison unit, a control unit, and a relay unit, wherein a first end of the comparison unit is connected to a first output end of a rectifier in a PFC circuit, a second end of the comparison unit is sequentially connected to the control unit and the relay unit, and the relay unit is connected in series to a live wire of the PFC circuit, so that rapidity and reliability of performing overvoltage protection on an air conditioner are further improved.
As shown in fig. 3, the overvoltage protection circuit includes:
the comparison unit 100 is configured to generate a control signal according to a reference voltage and a sampling voltage of the dc bus obtained from the PFC circuit;
the control unit 200 is used for receiving the control signal and controlling the driving signal output by the MCU according to the control signal, and the MCU sends driving signals RY-1 and RY-2 to the relay unit;
the relay unit 300 is configured to control a main loop power supply of the PFC circuit according to the driving signal;
the first end of the comparison unit 100 is connected to the first output end of the rectifier in the PFC circuit, the second end of the comparison unit 100 is sequentially connected to the control unit 200 and the relay unit 300, and the relay unit 300 is connected in series to the live line LIN of the PFC circuit.
In order to generate an accurate driving signal, the comparing unit 100 further includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a comparator a, wherein,
the first end of the first resistor R1 is connected as the first end of the comparison unit 100, the second end of the first resistor R1 is connected to the first end of the second resistor R2, the second end of the second resistor R2 and the first end of the third resistor R3 are connected to the non-inverting input terminal of the comparator a, the first end of the fourth resistor R4 is connected to a first dc power supply, the first dc power supply can be a 5V dc power supply, the second end of the fourth resistor R4 and the first end of the fifth resistor R5 are connected to the inverting input terminal of the comparator a, the common point of the second end of the third resistor R3 and the second end of the fifth resistor R5 is grounded, and the output terminal of the comparator a is the second end of the comparison unit 100.
It should be noted that, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, and the fifth resistor R5 are only one specific implementation of the present application, and a person skilled in the art may select different numbers or different resistances of resistors according to actual needs, which does not affect the protection scope of the present application.
In order to reduce interference, the comparison unit 100 further comprises a first capacitor C1 and a sixth resistor R6, wherein,
the first end of the first capacitor C1, the first end of the sixth resistor R6 and the positive power supply end of the comparator a are connected to the first direct current power supply, the second end of the sixth resistor R6 is connected to the output end of the comparator a, and the second end of the first capacitor C1 and the negative power supply end of the comparator a are both grounded.
Other circuit configurations may be selected by those skilled in the art to reduce the interference of the comparison unit, which does not affect the protection scope of the present application.
For reliable control of the driving signal, the control unit 200 further comprises a first switching transistor V1 and a second switching transistor V2, wherein,
the base of the first switching triode V1 and the base of the second switching triode V2 are connected to the second end of the comparison unit 100, the collector of the first switching triode V1 is connected to the first input end of the relay unit 300, the collector of the second switching triode V2 is connected to the second input end of the relay unit 300, and the common junction of the emitter of the first switching triode V1 and the emitter of the second switching triode V2 is grounded.
The skilled person can also flexibly select other circuit configurations for controlling the driving signal, which does not affect the scope of the present application.
In order to reliably protect the circuit according to the driving signal, the relay unit 300 further includes a relay controller N2, a first relay K1, a second relay K2, and a seventh resistor RT1, wherein,
a first input of the relay controller N2 is a first input of the relay unit 300, a second input of the relay controller N2 is a second input of the relay unit 300, a first output terminal of the relay controller N2 is connected to a first terminal of a coil of the first relay K1, a second output terminal of the relay controller N2 is connected to a first terminal of a coil of the second relay K2, the switch of the first relay K1 and the seventh resistor RT1 are sequentially connected in series on the live line LIN, the switch of the second relay K2 is connected in series to the live line LIN, the second end of the coil of the first relay K1 and the second end of the second relay K2 are both connected to a second dc power supply, the second dc power supply can be a 12V dc power supply, and the seventh resistor RT1 is a PTC (Positive Temperature Coefficient) thermistor.
The skilled person can flexibly set the type of control without affecting the scope of protection of the present application.
In order to reduce interference of the relay controller, the relay unit 300 further includes a second capacitor C2, a first terminal of the second capacitor C2 and a power supply terminal VCC of the relay controller are commonly connected to the second dc power supply, and a common point of a second terminal of the second capacitor C2 and a ground terminal GND of the relay controller is grounded.
In order to enable the signal generating power supply to obtain accurate sampling voltage, the first input end of the rectifier is connected with the seventh resistor RT1, the second input end of the rectifier is connected with the zero line NIN of the PFC circuit, and the second output end of the rectifier is grounded.
By applying the technical scheme, the overvoltage protection circuit comprises a comparison unit, a control unit and a relay unit, wherein the first end of the comparison unit is connected with the first output end of a rectifier in the PFC circuit, the second end of the comparison unit is sequentially connected with the control unit and the relay unit, the relay unit is connected in series with a live wire of the PFC circuit, voltage detection and protection are carried out by completely adopting a hardware circuit, sampling voltage is detected from the rear of the rectifier, a device can be protected in time and is not influenced by software reliability, and therefore the rapidity and the reliability of overvoltage protection on the air conditioner are further improved.
As shown in fig. 3, the main loop power supply of the PFC circuit has two relays K1 and K2 for control, K1 controls the charging PTC, K2 controls the main loop power supply, after power-on, K1 is first attracted to charge the capacitor C3 behind, then K1 is disconnected, K2 is attracted, voltage sampling is performed after the rectifier bridge is electrified through voltage division of the voltage division resistors R1, R2 and R3, and if the input voltage exceeds a specified working voltage range, the main loop power supply can be timely turned off to prevent a rear-stage device from bearing high voltage.
The inverting input terminal of the comparator A divides the voltage through R4 and R5 to set a reference voltage based on the protection voltage threshold. The positive phase input end of the comparator A is connected with the direct current bus side, and detected sampling voltage (namely direct current bus voltage) is divided by more than two resistors and then is input to the positive phase input end of the comparator A.
When the sampling voltage does not exceed the reference voltage of the inverting input end of the comparator A, the comparator A outputs a low level signal, the triodes V1 and V2 are cut off, the relay driving signals RY-1 and RY-2 sent out by the MCU end are high level signals, and the relay K1 or K2 is switched on; when the sampling voltage is too high, the divided voltage value is larger than the reference voltage of the inverting input end of the comparator A, the comparator A is overturned to output a high level signal, the triodes V1 and V2 are conducted, after the conduction, the two ends of the collector C and the emitter E of the triodes V1 and V2 are equivalently short-circuited, the relay driving signals RY-1 and RY-2 at the MCU end are equivalently connected to the ground and become low level signals, after the low level signals pass through the inverter of the relay UL2003, the low level signals become high level signals, therefore, the control coils of the relays K1 and K2 cannot be electrified, the relays K1 and K2 are disconnected, the power supply is cut off, and the protection effect is achieved on a rear-stage circuit.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (8)
1. An overvoltage protection circuit, characterized in that the circuit comprises a comparison unit, a control unit and a relay unit, wherein,
the comparison unit is used for generating a control signal according to the reference voltage and the sampling voltage of the direct current bus acquired from the PFC circuit;
the control unit is used for receiving the control signal and controlling a driving signal output by the MCU according to the control signal;
the relay unit is used for controlling a main loop power supply of the PFC circuit according to the driving signal;
the first end of the comparison unit is connected with the first output end of a rectifier in the PFC circuit, the second end of the comparison unit is sequentially connected with the control unit and the relay unit, and the relay unit is connected to a live wire of the PFC circuit in series.
2. The circuit of claim 1, wherein the comparison unit further comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a comparator, wherein,
the first end of the first resistor is connected to be the first end of the comparison unit, the second end of the first resistor is connected to the first end of the second resistor, the second end of the second resistor and the first end of the third resistor are connected to the in-phase input end of the comparator in a shared mode, the first end of the fourth resistor is connected to the first direct-current power supply, the second end of the fourth resistor and the first end of the fifth resistor are connected to the anti-phase input end of the comparator in a shared mode, the common joint point of the second ends of the third resistor and the fifth resistor is grounded, and the output end of the comparator is the second end of the comparison unit.
3. The circuit of claim 2, wherein the comparison unit further comprises a first capacitor and a sixth resistor, wherein,
the first end of the first capacitor, the first end of the sixth resistor and the positive power supply end of the comparator are connected with the first direct-current power supply, the second end of the sixth resistor is connected with the output end of the comparator, and the second end of the first capacitor and the negative power supply end of the comparator are grounded.
4. The circuit of claim 1, wherein the control unit further comprises a first switching transistor and a second switching transistor, wherein,
the base electrode of the first switch triode and the base electrode of the second switch triode are connected to the second end of the comparison unit in a sharing mode, the collector electrode of the first switch triode is connected with the first input end of the relay unit, the collector electrode of the second switch triode is connected with the second input end of the relay unit, and the common contact point of the emitter electrode of the first switch triode and the emitter electrode of the second switch triode is grounded.
5. The circuit of claim 1, wherein the relay unit further comprises a relay controller, a first relay, a second relay, and a seventh resistor, wherein,
the first input of relay controller does the first input of relay unit, the second input of relay controller does the second input of relay unit, the first output of relay controller is connected the first end of the coil of first relay, the second output of relay controller is connected the first end of the coil of second relay, the switch of first relay with seventh resistance is established ties in proper order on the fire line, the switch of second relay is established ties on the fire line, the second end of the coil of first relay with the second end of second relay all connects second DC power supply, seventh resistance is thermistor.
6. The circuit of claim 5, wherein the relay unit further comprises a second capacitor, a first terminal of the second capacitor and a power supply terminal of the relay controller are commonly connected to the second direct current power supply, and a common point of a second terminal of the second capacitor and a ground terminal of the relay controller is grounded.
7. The circuit of claim 5, wherein a first input terminal of the rectifier is connected to the seventh resistor, a second input terminal of the rectifier is connected to a zero line of the PFC circuit, and a second output terminal of the rectifier is connected to ground.
8. An air conditioner characterized by comprising the overvoltage protection circuit according to any one of claims 1 to 7, and further comprising:
the refrigerant circulation loop circulates the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator, the four-way valve and the pressure reducer;
the compressor is used for compressing low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharging the high-temperature and high-pressure refrigerant gas to the condenser;
an outdoor heat exchanger and an indoor heat exchanger, wherein one of the heat exchangers operates as a condenser and the other operates as an evaporator;
the four-way valve is used for controlling the flow direction of refrigerant in the refrigerant circulation loop so as to switch the outdoor heat exchanger and the indoor heat exchanger between the condenser and the evaporator;
an indoor environment temperature sensor for detecting an indoor environment temperature;
and the indoor coil temperature sensor is used for detecting the temperature of the indoor coil.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922336A (en) * | 2021-09-10 | 2022-01-11 | 青岛海信日立空调系统有限公司 | Frequency converter protection device, frequency converter and air conditioner |
| CN113983687A (en) * | 2021-11-01 | 2022-01-28 | 镇江市博德电气设备有限公司 | Intelligent control heating warm air blower and control method thereof |
| CN115143539A (en) * | 2022-07-05 | 2022-10-04 | 青岛海信日立空调系统有限公司 | Air conditioner |
-
2020
- 2020-10-19 CN CN202022329614.8U patent/CN214013855U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922336A (en) * | 2021-09-10 | 2022-01-11 | 青岛海信日立空调系统有限公司 | Frequency converter protection device, frequency converter and air conditioner |
| CN113983687A (en) * | 2021-11-01 | 2022-01-28 | 镇江市博德电气设备有限公司 | Intelligent control heating warm air blower and control method thereof |
| CN115143539A (en) * | 2022-07-05 | 2022-10-04 | 青岛海信日立空调系统有限公司 | Air conditioner |
| CN115143539B (en) * | 2022-07-05 | 2023-06-27 | 青岛海信日立空调系统有限公司 | Air conditioner |
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