CN111446698A - Voltage protection circuit of refrigerator - Google Patents
Voltage protection circuit of refrigerator Download PDFInfo
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- CN111446698A CN111446698A CN202010350125.2A CN202010350125A CN111446698A CN 111446698 A CN111446698 A CN 111446698A CN 202010350125 A CN202010350125 A CN 202010350125A CN 111446698 A CN111446698 A CN 111446698A
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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
- H02H7/08—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 dynamo-electric motors
- H02H7/09—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 dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/207—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage also responsive to under-voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
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Abstract
The invention discloses a voltage protection circuit of a refrigerator, which comprises an alternating current voltage source and a compressor controller, wherein a variable voltage filter circuit, a comparison integral circuit and a time delay protection circuit are sequentially connected and positioned between the alternating current voltage source and the compressor controller, and the compressor controller is also connected with a low current detection circuit. The problem that the compressor is damaged due to the fact that the relay cannot be protected timely, multiple times of instantaneous on-off of the compressor and too low working current are effectively solved. According to the invention, the alternating voltage provided by the alternating voltage source V1 is processed by the voltage transformation filter circuit to obtain the direct voltage and is transmitted to the comparison integrating circuit, the comparison integrating circuit and the low current detection circuit output signals to the delay protection circuit, so that the relay K1 is controlled to change the connection state of the pin of the relay, the compressor controller U3 is protected, the positive feedback is set to prevent the relay K1 from being protected in time, and the integrator is set to prevent the compressor from being damaged due to multiple instantaneous on-off in a short time.
Description
Technical Field
The invention relates to the field of voltage protection, in particular to a voltage protection circuit of a refrigerator.
Background
With the improvement of living standard, the refrigerator gradually becomes one of the household appliances commonly used in our country, and the compressor is the core of the refrigerator to finish the refrigeration work. The refrigerator is in an overvoltage state or an undervoltage state caused by voltage fluctuation of a power grid, and the two states can cause great damage to a compressor of the refrigerator, so that the refrigerator cannot work normally, and a protection circuit is required to be arranged to avoid damage. In the prior art, an over-voltage and under-voltage detection circuit is adopted to drive a relay to protect a compressor, but the detection speed is too low, so that the relay cannot timely protect the compressor;
when the voltage of the power grid is unstable and changes back and forth between an over-voltage state and a low-voltage state and a normal state, the relay can drive the compressor to be disconnected or connected along with the change of the voltage state to form protection on the compressor, and the compressor is not damaged by multiple on-off of the compressor in a short time;
when the working current of the compressor is too low due to possible faults in the compressor after the compressor works for a long time, the refrigeration effect cannot be achieved, and the compressor is burnt out finally due to the fact that the compressor does not stop running continuously.
The present invention therefore provides a new solution to this problem.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a voltage protection circuit of a refrigerator, which effectively solves the problems that a relay cannot be protected in time, and a compressor is damaged due to repeated instantaneous on-off and low working current.
The technical scheme for solving the problem is that the compressor protection circuit comprises an alternating current voltage source, a compressor controller, a voltage protection circuit, a voltage transformation filter circuit, a comparison integral circuit, a time delay protection circuit and a low current detection circuit, wherein the alternating current voltage source of the voltage transformation filter circuit is connected with the voltage transformation filter circuit, the voltage transformation filter circuit is connected with the comparison integral circuit, the comparison integral circuit is connected with the time delay protection circuit, and the time delay protection circuit is also connected with the low current detection circuit;
the time-delay protection circuit is connected with a signal input end in the compressor controller, and the low-current detection circuit is connected with a compressor working current detection output end in the compressor controller.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages: 1. Setting a resistor R4 as a positive feedback resistor, a resistor R7 as a positive feedback resistor of an operational amplifier U2B, a resistor R13 as a positive feedback resistor of an operational amplifier U4B in a low current detection circuit, a diode D4 and a diode D5, a diode D6 and a diode D7, a diode D12 and a diode D13 as amplitude limiting links of the operational amplifier U1B, the operational amplifier U2B and the operational amplifier U4B in the comparison integration circuit, wherein the positive feedback speeds up the comparison speed of the operational amplifier U1B, the operational amplifier U2B and the operational amplifier U4B, the amplitude limiting links provide protection for the operational amplifier U1B, the operational amplifier U2B and the operational amplifier U4B, and the problem that the relay K1 cannot timely protect a compressor due to the over-low detection speed of the undervoltage detection circuit is solved;
2. the time delay protection circuit is triggered when the conduction of the OR gate circuit is detected to be continuous, the damage to the compressor caused by multiple instantaneous on-off and too low working current of the compressor is avoided, and the capacity of the time delay protection circuit driven by the comparison integral circuit is improved by arranging the emitter follower.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The foregoing and other technical and other features and advantages of the invention will be apparent from the following detailed description of the embodiments, which proceeds with reference to fig. 1. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
A voltage protection circuit of a refrigerator, the application has increased the filter circuit of voltage transformation, comparing the integral circuit, time delay protection circuit between AC voltage source and compressor controller, the compressor controller still connects the low current detection circuit;
when the voltage provided by the alternating current source V is in a normal state, namely when the voltage value provided by the alternating current source V is lower than the voltage UH, the voltage value provided by the voltage regulator U is lower than the voltage value provided by the alternating current source V, the voltage regulator U consisting of the triode Q, the resistor R and the voltage stabilizing diode D is used for stabilizing the direct current voltage, the stability of the direct current voltage is maintained, the high-frequency part of the direct current voltage is filtered by a second-order low-pass filter consisting of the resistor R, the low-frequency part of the direct current voltage is only reserved, the direct current voltage enters an overvoltage detection part and an undervoltage detection part in a voltage comparison circuit, the comparison integration circuit comprises an overvoltage detection part, an undervoltage detection part and an integrator, when the voltage provided by the alternating current source V is in a normal state, namely the voltage value is lower than the voltage UH and higher than the voltage U, the overvoltage detection part and the undervoltage detection part cannot provide or the diode D in the gate circuit to the gate circuit, the gate circuit is normally operated, the amplitude limiting controller U, the low-current detection circuit is used for detecting that the low-current detection circuit is used for detecting the transistor U, the transistor U4, when the transistor U, the transistor U4 is not provided by the transistor U, the transistor U is used for detecting the transistor U, the transistor U is used for detecting, the transistor U4 is used for detecting, the transistor U is used for detecting, the transistor U is used for detecting, the transistor U is used for detecting, the transistor U is used for detecting, the transistor U, the voltage is used for detecting the voltage, the voltage is used for detecting, the voltage, the detecting the voltage, the detecting, the transistor U, the detecting, the detecting is used for detecting the detecting;
the transformer T1 in the transformation filter circuit reduces the alternating voltage provided by the alternating voltage source V1 by using the ratio of the number of turns of the primary winding to the secondary winding, the alternating voltage source V1 is provided by commercial power, the TVS diode D1 is used for preventing the surge phenomenon from damaging the circuit when the alternating voltage source V1 is connected to the circuit, the rectifier bridge D2 converts the reduced alternating voltage into direct voltage, the direct voltage is not stable enough at the moment, a voltage stabilizer consisting of a triode Q1, a triode Q2, a resistor R1 and a voltage stabilizing diode D3 is used for stabilizing the direct voltage, a resistor R1 is a protective resistor of a triode Q1 and a triode Q2 for preventing the triode Q1 and the triode Q2 from being damaged by overlarge current, the triode Q1 and the triode Q2 form a composite NPN triode, the voltage value output by the rectifier bridge D2 firstly passes through the triode Q2 and then reaches the triode Q1, and the triode Q1 is used for controlling the triode Q2, the voltage stabilizing diode D3 is connected to the base of the triode Q1, the triode Q1 and the triode Q2 provide stable input voltage for the comparison integrating circuit, the second-order low-pass filter composed of the resistor R2, the resistor R3, the capacitor C1 and the capacitor C2 is used to filter the high-frequency noise of the DC voltage, only the low-frequency part of the DC voltage is reserved, and the influence of the high-frequency noise on the voltage detection of the DC voltage in the comparison integrating circuit is avoided, the voltage stabilizing diode comprises a TVS diode D1, one end of the TVS diode D1 is respectively connected to the positive-polarity pin of the AC voltage source V1 and the primary-side pin 5961 of the transformer T1, the other end of the TVS diode D1 is respectively connected to the negative-polarity pin of the AC voltage source V1 and the primary-side pin 2 of the transformer T1 and is grounded, the secondary-side 3 pin of the transformer is connected to the upper end of the rectifier bridge D2, the secondary, the left end of a rectifier bridge D2 is respectively connected with one end of a resistor R1, the anode of a zener diode D3, one end of a capacitor C1 and one end of a capacitor C2 and is connected with the ground in parallel, the right end of the rectifier bridge D2 is respectively connected with the other end of a resistor R1 and the emitter of a triode Q2, the base of a triode Q2 is connected with the collector of a triode Q1, the base of a triode Q1 is connected with the cathode of a zener diode D3, the emitter of a triode Q1 is respectively connected with one end of a resistor R1 and the collector of the triode Q1, the other end of the resistor R1 is respectively connected with the other end of the capacitor C1 and one end of the resistor R1, the other end of the resistor R1 is respectively connected with the anode of a diode D1, the triodes Q1, the triode Q1, the resistor R1, the capacitor C1 and the zener diode D1 form a second-order filter;
when the direct current voltage is in a normal state, namely the direct current voltage value is lower than the voltage UH and higher than the voltage U, the voltage U is higher than the voltage U, the voltage U cannot be obtained by the turns ratio of the primary side winding of the transformer T, the signal D output by the overvoltage detection part and the undervoltage detection part is not conducted by the diode D and the diode D, when the direct current voltage is in a normal state, namely the direct current voltage value is lower than the voltage UH and higher than the voltage U, the signal D output by the overvoltage detection part and the undervoltage detection part cannot be conducted by the diode D and the diode D, when the direct current voltage value is higher than the UH, the alternating current voltage provided by the alternating current voltage source V at this time is in an overvoltage state, the operational amplifier U1 outputs a high-level signal, or the diode D in the operational amplifier circuit is conducted, the operational amplifier U2 outputs a high-level signal, the operational amplifier U2 outputs a low-level signal, the operational amplifier U cannot conduct the diode D, the operational amplifier U2 outputs a low-level signal D, the operational amplifier is a diode D, the operational amplifier is connected with the amplifier, the operational amplifier U is connected with the amplifier, the operational amplifier U2, the operational amplifier U is connected with the amplifier, the amplifier U is connected with the amplifier, the operational amplifier, the amplifier U is connected with the operational amplifier U is connected with the amplifier, the operational amplifier, the operational amplifier, the operational amplifier U is connected with the operational amplifier, the amplifier U is the operational amplifier, the operational amplifier U is the operational amplifier, the operational amplifier U is the operational amplifier, the operational amplifier U is the operational amplifier, the operational amplifier U is connected with the operational amplifier, the operational amplifier U is the operational amplifier, the operational amplifier U is the operational amplifier, the operational amplifier U is the operational amplifier, the operational amplifier U is the operational amplifier, the operational amplifier U is the operational amplifier, the operational amplifier U is the operational;
the time-delay protection circuit receives a signal transmitted from the voltage comparison circuit, because the voltage at two ends of the capacitor can not change suddenly, the signal received from the voltage comparison circuit firstly charges the capacitor C4 quickly, when the capacitor C4 is charged, the triode Q4 is conducted, then the triode Q5 is conducted, the triode Q4 is conducted and then transmits the signal to the relay K1 through the resistor R11, the 4 pin of the relay K1 is connected to the 3 pin, the diode D10 is a freewheeling diode of the relay K1 to play a protection role, the 1 pin and the 2 pin of the compressor controller U3 do not form a passage, the compressor controller U3 is in an open circuit state and can not work, when the alternating voltage provided by the alternating voltage source V1 is recovered to a normal state from an overvoltage or undervoltage state or when the current detection part detects that the working current of the compressor controller U3 is in a normal state or the working current of the compressor U3 is in a normal state, the comparison integration circuit can not output signals to the delay protection circuit, at this time, the capacitor C4 starts to discharge the transistor Q4 and the transistor Q5, the slide rheostat R22 is responsible for controlling the discharge speed of the capacitor C4, the discharge speed of the capacitor C4 can be changed by changing the resistance value of the slide rheostat R22, so as to control the delay time of the delay protection circuit, the resistor R22 and the resistor R17 are respectively the collector resistors of the transistor Q2 and the transistor Q3, the transistor Q2 and the transistor Q3 are continuously conducted, the 4 pin of the relay K1 is further connected to the 3 pin, the compressor controller U3 is still in an open circuit state and can not work, wherein the 1 pin and the 2 pin of the compressor controller U3 are signal input terminals, the 3 pin is a working current detection output terminal of the compressor, the 4 pin is connected to ground, and the transistor Q4 and the transistor Q5 are immediately in a cut-off state and can not be conducted after the capacitor C4 is, the 4 pins of the relay K1 are reconnected to the 5 pins, the compressor controller U3 forms a passage to start working, so that a delay protection circuit is formed on the relay K1, power supply to the compressor immediately after power failure of the refrigerator is avoided, the compressor is difficult to start due to overlarge internal pressure of the system, and the service life of the refrigerator is further influenced, the delay protection circuit comprises a capacitor C4, one end of a capacitor C4 is respectively connected with one end of a resistor R17, an emitter of a triode Q5, an emitter of a triode Q3 in a comparison integrating circuit and the other end of a resistor R16, the other end of a capacitor C4 is respectively connected with the upper end of a slide rheostat R22 and the emitter of a triode Q4, the adjustable end of the slide rheostat R22 is respectively connected with the lower end of the slide rheostat R22 and one end of a capacitor C5, the base of a triode Q4 is connected with the other end of a capacitor C5, the, A base of a triode Q5, a collector of a triode Q5 is connected with one end of a resistor R18, the other end of the resistor R18 is respectively connected with a cathode of a diode D10 and a pin 2 of a relay K1, a pin 1 of a relay K1 is connected with an anode of the diode and is grounded, one end of a pin 4 of the relay K1 is connected with one end of a pin 5, the pin 3 is connected with ground, the other end of a pin 4 of the relay K1 is connected with a pin 1 of a compressor U3, the other end of a pin 5 of the relay K1 is connected with a pin 2 of a compressor U3, a pin 4 of the compressor U3 is connected with ground, and a pin 3 of the compressor U3 is connected with an anode of a diode D11 in a comparison integrating;
the low current detection circuit detects the working current of the compressor controller U3, when the compressor controller U3 starts to work normally, the output current is firstly transmitted to the low current detection circuit through the diode D11, the resistor R20 is used for converting the current signal of the compressor controller U3 into a voltage signal, the diode D11 is used for avoiding the voltage from flowing backwards to the compressor controller U3, the value of the voltage VDD is the voltage value obtained by multiplying the working current of the compressor marked on the refrigerator by the resistance value of the resistor R19, the current detection part starts to detect the working current of the compressor controller U3, when the operational amplifier U4B outputs a high level signal to conduct the diode D14, and when the diode D14 is conducted, the diode D8, the diode D9, the diode D14 and the resistor R10 are also conducted or a gate circuit is also conducted, which indicates that the working current of the compressor controller U3 is lower than the VDD, the high level signal is output to the integrator, therefore, the compressor controller U3 is protected, when the operational amplifier U4B outputs a low level signal, the diode D14 cannot be turned on, which indicates that the working current of the compressor U3 is in a normal state, the diode D12 and the diode D13 serve as the amplitude limiting link of the operational amplifier U4B, the resistor R13 is a positive feedback resistor of the operational amplifier U4B, the TVS diode D15 is used for improving the anti-interference capability of the operational amplifier U4B and avoiding interference in the comparison process, and includes a diode D11, the anode of the diode D11 is connected with the 3 pin of the compressor controller U3, the cathode of the diode D11 is connected with one end of a resistor R20, the other end of the resistor R20 is respectively connected with the anode of the diode D12, the cathode of the diode D13, the inverting input end of the operational amplifier U4B, the cathode of the diode D12 is respectively connected with one end of the resistor R19, the anode of the diode D19, the non-inverting input end of the operational amplifier U4, the non-inverting input end of the resistor R19, and the power, the output end of the operational amplifier U4B is connected to the other end of the resistor R13, the other end of the TVS diode D15, and the anode of the diode D14, one end of the TVS diode D15 is connected to the other end of the resistor R10 and the other end of the resistor R15 in the comparison and integration circuit, respectively, and is connected to ground, and the cathode of the diode D14 is connected to the cathode of the diode D8, the cathode of the diode D9, one end of the resistor R10, and one end of the resistor R11 in the comparison and integration circuit, respectively.
When the invention is used specifically, the transformation filter circuit converts alternating voltage provided by an alternating current source V into direct current voltage by using a transformer T and a rectifier bridge D, a voltage stabilizer consisting of a triode Q, a resistor R and a voltage stabilizing diode D is used for stabilizing the direct current voltage output from the rectifier bridge D, the voltage output to a voltage comparison circuit is ensured to be stable, a second-order low-pass filter consisting of the resistor R, the capacitor C and the capacitor C is used for filtering high-frequency noise existing in the direct current voltage, then the high-frequency noise enters an overvoltage detection part and an undervoltage detection part in a voltage comparison circuit in two ways, in the comparison integration circuit, when the voltage provided by the alternating current source V is in a normal state, namely the voltage value is lower than the voltage UH and higher than the voltage U, the signal output by the overvoltage detection part and the undervoltage detection part cannot conduct a diode D or a diode D in a gate circuit, the compressor controller U normally works, the diode D and the diode D are used as a feedback resistor D of the operational amplifier U1, the operational resistor D and the operational amplifier D, the operational amplifier D are used as the operational amplifier, when the operational amplifier is in a normal state, the operational state of the operational amplifier, the operational amplifier is detected, when the operational state of the operational amplifier U, the operational amplifier is detected, the operational state of the operational amplifier is detected, the operational state, the operational amplifier is detected, the operational amplifier, the operational state of the operational amplifier is detected, when the operational amplifier is the operational state of the operational amplifier, the operational amplifier is the operational amplifier, the operational amplifier is detected, the operational amplifier is the operational state of the operational amplifier, the operational amplifier is the operational amplifier, when the operational amplifier, the operational amplifier is the operational state of the operational amplifier, the operational amplifier is detected, the operational state of the operational amplifier is the operational amplifier, the operational state of the operational amplifier is the operational amplifier, when the operational amplifier is the operational state of the operational amplifier, the operational amplifier is the operational amplifier, the operational amplifier is the operational amplifier, the operational state of the operational amplifier, the operational amplifier is the operational state of the operational amplifier is the operational amplifier, the operational state of the operational amplifier, the operational amplifier is the operational amplifier, the operational amplifier is in the operational amplifier, the operational state of the operational amplifier, the operational amplifier circuit, the operational state of the operational amplifier circuit, the operational state of the operational amplifier, the operational state of the operational amplifier is the operational amplifier, the operational state of the operational amplifier;
through setting up positive feedback for fortune ware U1B, fortune ware U2B, fortune ware U4B, the speed of comparison has been improved, set up the amplitude limiting link and protect for fortune ware U1B, fortune ware U2B, fortune ware U4B, speed when having solved that under-voltage detection circuit detects and low current detection circuit carries out the comparison slow excessively and lead to relay K1 in time to form the protection to the compressor, set up the integrator and avoided a lot of instantaneous break-make to cause the harm to compressor U3.
Claims (5)
1. A voltage protection circuit of a refrigerator comprises an alternating current voltage source and a compressor controller, and is characterized in that the voltage protection circuit also comprises a voltage transformation filter circuit, a comparison integral circuit, a delay protection circuit and a low current detection circuit, wherein the alternating current voltage source of the voltage transformation filter circuit is connected with the voltage transformation filter circuit, the voltage transformation filter circuit is connected with the comparison integral circuit, the comparison integral circuit is connected with the delay protection circuit, and the delay protection circuit is also connected with the low current detection circuit;
the time-delay protection circuit is connected with a signal input end in the compressor controller, and the low-current detection circuit is connected with a compressor working current detection output end in the compressor controller.
2. A voltage protection circuit of a refrigerator according to claim 1, wherein the transformer filter circuit includes a TVS diode D1, one end of the TVS diode D1 is connected to a positive polarity pin of the AC voltage source V1 and a primary side 1 pin of the transformer T1, the other end of the TVS diode D1 is connected to a negative polarity pin of the AC voltage source V1 and a primary side 2 pin of the transformer T1 and grounded, a secondary side 3 pin of the transformer is connected to an upper end of the rectifier bridge D2, a secondary side 4 pin of the transformer T1 is connected to a lower end of the rectifier bridge D2, a left end of the rectifier bridge D2 is connected to one end of the resistor R1, a positive electrode of the regulator diode D3, one end of the capacitor C1 and one end of the capacitor C2 and grounded, a right end of the rectifier bridge D2 is connected to the other end of the resistor R1 and an emitter of the transistor Q2, a base of the transistor Q2 is connected to a collector of the transistor Q1, the base electrode of the triode Q1 is connected with the negative electrode of the voltage stabilizing diode D3, the emitter electrode of the triode Q1 is respectively connected with one end of the resistor R2 and the collector electrode of the triode Q2, the other end of the resistor R2 is respectively connected with the other end of the capacitor C1 and one end of the resistor R3, the other end of the resistor R3 is respectively connected with the other end of the capacitor C2 and the positive electrode of the diode D16, the triode Q2, the triode Q1, the resistor R1 and the voltage stabilizing diode D3 form a voltage stabilizer, and the resistor R2, the resistor R3, the capacitor C1 and the capacitor C2 form a second-order low.
3. A voltage protection circuit for a refrigerator according to claim 1, wherein the comparator integrator circuit includes a diode D and a diode D, the anode of the diode D is connected to the cathode of the diode D, one end of a resistor R, the non-inverting input terminal of an operational amplifier U1, the anode of the diode D, the cathode of the diode D, the inverting input terminal of an operational amplifier U2, one end of a resistor R, and the cathode of the diode D in the transformer filter circuit, the cathode of the diode D is connected to the anode of the diode D, one end of the resistor R, the inverting input terminal of the operational amplifier U1, one end of the resistor R, the other end of the resistor R is connected to the voltage UH, the output terminal of the operational amplifier U1 is connected to the other end of the resistor R, the anode of the diode D, the cathode of the diode D is connected to the anode of the diode D, one end of the resistor R, the non-inverting input terminal of the operational amplifier U2, the other end of the resistor R is connected to the emitter of the diode D, the resistor R5, the emitter of the operational amplifier U2 is connected to the emitter of the diode R, the resistor R, the emitter of the diode R5, the resistor R is connected to the emitter of the transistor Q, the transistor Q and the transistor Q.
4. A voltage protection circuit of a refrigerator according to claim 1, wherein said delay protection circuit comprises a capacitor C4, one end of a capacitor C4 is connected to one end of a resistor R17, an emitter of a transistor Q5, an emitter of a transistor Q3 in the comparison integration circuit, the other end of a resistor R16, the other end of a capacitor C4 is connected to the upper end of a slide rheostat R22 and the emitter of a transistor Q4, the adjustable end of a slide rheostat R22 is connected to the lower end of a slide rheostat R22 and one end of a capacitor C5, the base of a transistor Q4 is connected to the other end of a capacitor C5, the collector of a transistor Q4 is connected to the other end of a resistor R17 and the base of a transistor Q5, the collector of a transistor Q5 is connected to one end of a resistor R18, the other end of a resistor R18 is connected to the cathode of a diode D10 and the 2 pin of a relay K1, the 1 pin of the relay K1 is connected to the, one end of the 4 pins of the relay K1 is connected with one end of the 5 pins, the 3 pins are connected with the ground, the other end of the 4 pins of the relay K1 is connected with the 1 pin of the compressor controller U3, the other end of the 5 pins of the relay K1 is connected with the 2 pin of the compressor U3, and the 4 pins of the compressor controller U3 are connected with the ground.
5. A voltage protection circuit of a refrigerator according to claim 1, wherein the low current detection circuit includes a diode D11, an anode of a diode D11 is connected to the 3 pin of the compressor controller U3, a cathode of a diode D11 is connected to one end of a resistor R20, the other end of the resistor R20 is connected to an anode of a diode D12, a cathode of a diode D13, and an inverting input terminal of an operational amplifier U4B, a cathode of a diode D12 is connected to one end of a resistor R19, an anode of a diode D13, a non-inverting input terminal of an operational amplifier U4B, and one end of a resistor R13, the other end of a resistor R19 is connected to a positive power source VCC, an output terminal of the operational amplifier U4B is connected to the other end of a resistor R13, the other end of a TVS diode D15, and an anode of a diode D14, one end of a TVS diode D15 is connected to the other end of the comparison integrator circuit and connected to the ground, the cathode of the diode D14 is connected to the cathode of the diode D8, the cathode of the diode D9, one end of the resistor R10, and one end of the resistor R11 in the comparison integration circuit, respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010350125.2A CN111446698A (en) | 2020-04-28 | 2020-04-28 | Voltage protection circuit of refrigerator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010350125.2A CN111446698A (en) | 2020-04-28 | 2020-04-28 | Voltage protection circuit of refrigerator |
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| CN111446698A true CN111446698A (en) | 2020-07-24 |
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| CN202010350125.2A Withdrawn CN111446698A (en) | 2020-04-28 | 2020-04-28 | Voltage protection circuit of refrigerator |
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| CN202651762U (en) * | 2012-04-07 | 2013-01-02 | 介国安 | Underload protection circuit inactive on startup |
| CN106786389A (en) * | 2017-01-03 | 2017-05-31 | 安徽美芝制冷设备有限公司 | Overcurrent protective device, frequency-changeable compressor system and refrigerator for frequency-changeable compressor |
| CN107749717A (en) * | 2017-10-27 | 2018-03-02 | 成都冠深科技有限公司 | A kind of refrigerator power socket voltage detection type protection circuit |
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2020
- 2020-04-28 CN CN202010350125.2A patent/CN111446698A/en not_active Withdrawn
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|---|---|---|---|---|
| CN2071315U (en) * | 1989-10-28 | 1991-02-13 | 吴星金 | Fully automatic multifunctional protector of refrigerator |
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