CN215337251U - Defrosting heating power supply circuit and refrigerator - Google Patents
Defrosting heating power supply circuit and refrigerator Download PDFInfo
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- CN215337251U CN215337251U CN202121026714.1U CN202121026714U CN215337251U CN 215337251 U CN215337251 U CN 215337251U CN 202121026714 U CN202121026714 U CN 202121026714U CN 215337251 U CN215337251 U CN 215337251U
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Abstract
The utility model provides a defrosting heating power supply circuit and a refrigerator, wherein the defrosting heating power supply circuit comprises: the transformer is respectively connected with the power management module and the output voltage detection module; the power supply management module is used for converting a direct current input voltage output by the high-voltage direct current power supply into an alternating current input voltage so as to send the alternating current input voltage to the transformer; the transformer is used for converting the alternating current input voltage into direct current output voltage; the power supply management module is also used for regulating and transmitting the direct current output voltage to the direct current output voltage according to a voltage feedback signal from the output voltage detection module when the direct current output voltage detected by the output voltage detection module is smaller than a preset voltage threshold; and the output voltage detection module is used for detecting the direct current output voltage and outputting the direct current output voltage when the power management module determines that the direct current output voltage reaches a preset voltage threshold value so as to utilize the direct current output voltage to carry out defrosting heating. This scheme can improve the defrosting efficiency.
Description
Technical Field
The utility model relates to the technical field of power supplies, in particular to a defrosting heating power supply circuit and a refrigerator.
Background
The frostless refrigerator utilizes the refrigeration evaporator to send cold air into each part through each air duct so as to achieve the purpose of cooling, the frostless refrigerator is provided with a defrosting system, but the surface of the evaporator is frosted after the compressor works for a period of time, and the air duct is blocked without defrosting, so that the cold air can not be circulated and the refrigeration effect is reduced. Defrosting by heating wires is therefore required. At present, the silicon controlled rectifier is controlled to be switched on, so that alternating current power supply is provided for the heater, but the voltage of the alternating current voltage input sine wave voltage is 220% +/-20% influenced by the fluctuation of a mains supply power grid, so that the heater cannot keep stable power, and the defrosting performance efficiency of the refrigerator is influenced to be lower.
Chinese patent application No. CN202010393219.8 discloses a dual-system refrigerator and a defrosting control method thereof, which mainly discloses defrosting an evaporator by using a high-temperature and high-pressure refrigerant, reducing the operation time of a defrosting heater, and reducing the energy consumption of defrosting, but does not solve the problem of low defrosting efficiency caused by voltage fluctuation.
SUMMERY OF THE UTILITY MODEL
The utility model provides a defrosting heating power supply circuit and a refrigerator, which can improve defrosting efficiency.
In a first aspect, an embodiment of the present invention provides a defrosting heating power supply circuit, including:
the device comprises a transformer, a power management module and an output voltage detection module;
the transformer is respectively connected with the power management module and the output voltage detection module;
the power supply management module is used for converting a direct-current input voltage output by the high-voltage direct-current power supply into an alternating-current input voltage so as to send the alternating-current input voltage to the transformer;
the transformer is used for converting the alternating current input voltage into direct current output voltage;
the power supply management module is further configured to adjust and transmit the dc output voltage to the output voltage detection module according to a voltage feedback signal from the output voltage detection module when the dc output voltage detected by the output voltage detection module is smaller than a preset voltage threshold;
the output voltage detection module is used for detecting the direct current output voltage and outputting the direct current output voltage when the power management module determines that the direct current output voltage reaches the preset voltage threshold value, so that defrosting heating is performed by using the direct current output voltage.
Alternatively,
the power management module includes: the power supply comprises a driving circuit, a power management auxiliary circuit, a power chip, a power supply circuit and a follow current circuit;
the driving circuit is respectively connected with the direct current input voltage and the power supply chip;
the power supply chip is connected with the power supply management auxiliary circuit;
the power management auxiliary circuit is respectively connected with the power chip and the transformer;
the driving circuit is used for controlling the on-off of the driving circuit according to a PWM control signal from the power supply chip so as to convert the direct current input voltage into the alternating current input voltage;
the power supply chip is used for regulating and transmitting the direct current output voltage to the direct current output voltage according to a voltage feedback signal from the output voltage detection module when the direct current output voltage detected by the output voltage detection module is smaller than a preset voltage threshold;
the power supply management auxiliary circuit is used for providing electric energy for the first start of the power supply chip and filtering the voltage feedback signal from the output voltage detection module;
the power supply circuit is used for supplying power to the power supply chip;
and the follow current circuit is used for providing a current loop for the winding inductance of the transformer.
Alternatively,
the drive circuit includes: the circuit comprises a first MOS tube, a first diode, a first resistor, a second resistor and a third resistor;
the direct-current input voltage is input to a drain electrode of the first MOS tube, a grid electrode and a source electrode of the first MOS tube are respectively connected with two ends of the first resistor, the grid electrode of the first MOS tube is connected with an anode of the first diode, a cathode of the first diode is connected with a first end of the third resistor, a second end of the third resistor is connected with a first end of the second resistor, a second end of the second resistor is connected with an anode of the first diode, and a first pin of the power chip is connected with a second end of the third resistor.
Alternatively,
the power management accessory circuit includes: the photoelectric coupler comprises a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first capacitor, a second capacitor, a third capacitor and a photoelectric coupler;
a second pin of the power supply chip is connected with a first end of the first capacitor, and a second end of the first capacitor is connected with a third pin of the power supply chip;
a first end of a first winding of the transformer is connected with a second end of the first capacitor, a first end of a fourth resistor is connected with the first end of the first capacitor, a second end of the fourth resistor is connected with the driving circuit, a second end of a fifth resistor is connected with a first end of a sixth resistor, a second end of the sixth resistor is connected with a first end of a seventh resistor, a second end of the seventh resistor is connected with a second end of the first capacitor, the seventh resistor is connected with the second capacitor in parallel, and a first end of the seventh resistor is connected with a fourth pin of the power chip;
the high-voltage direct-current power supply is connected with a first end of the eighth resistor, a second end of the eighth resistor is connected with a first end of the ninth resistor, and a second end of the ninth resistor is connected with a fifth pin of the power supply chip;
the first end of the third capacitor is connected with the first pin of the photoelectric coupler, the second end of the third capacitor is connected with the second pin of the photoelectric coupler, and the first end of the third capacitor is connected with the sixth pin of the power chip.
Alternatively,
the power supply circuit includes: a tenth resistor, an eleventh resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a second diode, a third diode, a first triode and a first voltage stabilizing diode;
a second end of the first winding of the transformer is connected with a first end of the tenth resistor, a second end of the tenth resistor is connected with an anode of the second diode, the cathode of the second diode is connected with the first end of the eleventh resistor, the second end of the eleventh resistor is connected with the first end of the fourth capacitor, the second end of the fourth capacitor is connected with the anode of the first voltage-stabilizing diode, the cathode of the first voltage-stabilizing diode is connected with the base electrode of the first triode, a collector of the first triode is connected with a first end of the eleventh resistor, an emitter of the first triode is connected with an anode of the third diode, the negative electrode of the third diode is connected with one end of a fifth capacitor, the fifth capacitor is connected with the sixth capacitor in parallel, and one end of the sixth capacitor is connected with a sixth pin of the power chip.
Alternatively,
the freewheel circuit includes: a twelfth resistor and a fourth diode;
a first end of the twelfth resistor is connected with the driving circuit, a second end of the twelfth resistor is connected with a cathode of the fourth diode, and an anode of the fourth diode is grounded; and the cathode of the fourth diode is connected with the first end of the second winding of the transformer.
Alternatively,
the output voltage detection module includes: a feedback circuit and an integrating circuit;
the feedback circuit is used for detecting the direct current output voltage and returning the voltage feedback signal to the power supply management module according to the detected direct current output voltage;
the integrating circuit is used for stabilizing the voltage feedback signal.
Alternatively,
the feedback circuit includes: a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a seventh capacitor, an eighth capacitor, a second zener diode, a photoelectric coupler, a three-terminal regulator and a second triode;
the first end of the seventh capacitor is connected with the second end of the second winding of the transformer, and the first end of the seventh capacitor is grounded;
one end of the thirteenth resistor is connected with the first end of the seventh capacitor, the thirteenth resistor, the fourteenth resistor and the fifteenth resistor are connected in series, one end of the fifteenth resistor is connected with the third pin of the photoelectric coupler, the fourth pin of the photoelectric coupler is connected with the cathode of the three-terminal regulator, the reference electrode of the three-terminal regulator is connected with the first end of the twentieth resistor, the anode of the three-terminal regulator is connected with the emitter of the second triode, the emitter and the base of the second triode are respectively connected with two pin ports, the collector of the second triode is connected with the first end of the sixteenth resistor, the second end of the sixteenth resistor is connected with the fourth pin of the photoelectric coupler, and the eighth capacitor is connected with the second zener diode in parallel, a first end of the eighth capacitor is connected with one end of the fifteenth resistor, and a first end of the eighth capacitor is connected with an emitter of the second triode;
one end of the seventeenth resistor is connected with the first end of the seventh capacitor, the seventeenth resistor, the eighteenth resistor, the nineteenth resistor and the twentieth resistor are connected in series, the second end of the twentieth resistor is connected with the anode of the three-terminal regulator, the twenty-first resistor is connected in series with the twenty-second resistor, one end of the twenty-first resistor is connected with the first end of the seventh capacitor, and one end of the twenty-second resistor is connected with the second end of the twentieth resistor;
the integration circuit includes: a twenty-third resistor, a twenty-fourth resistor, and a ninth capacitor;
the first end of the ninth capacitor is connected with the fourth pin of the photoelectric coupler, the second end of the ninth capacitor is connected with the first end of the twenty-third resistor, the second end of the twenty-third resistor is connected with the first end of the twentieth resistor, the first end of the twenty-fourth resistor is connected with the third pin of the photoelectric coupler, and the second end of the twenty-fourth resistor is connected with the fourth pin of the photoelectric coupler.
In a second aspect, an embodiment of the present invention further provides a refrigerator, including: a refrigerator body and a defrosting heating power supply circuit provided by the first aspect or any possible implementation manner of the first aspect;
the refrigerator body is connected with the defrosting heating power circuit;
the refrigerator body is used for heating the heater in the refrigerator body by using the defrosting heating power supply circuit so as to finish defrosting.
The defrosting heating power supply circuit comprises a transformer, a power supply management module and an output voltage detection module, wherein the transformer is respectively connected with the power supply management module and the output voltage detection module, the power supply management module converts a direct current input voltage output by a high-voltage direct current power supply into an alternating current input voltage and sends the alternating current input voltage to the transformer so as to convert the alternating current input voltage into a direct current output voltage, the output voltage detection module is used for detecting the direct current output voltage, when the power supply management module determines that the direct current output voltage is smaller than a preset voltage threshold value, the direct current output voltage is further regulated and transmitted to the direct current output voltage according to a voltage feedback signal until the direct current output voltage reaches the preset voltage threshold value, the direct current output voltage is output to carry out defrosting heating, and the output voltage is controlled to be stable, the influence of the fluctuation of a mains supply power grid is avoided, and the constant power of a heater for defrosting and heating by utilizing the output voltage is further ensured to be maintained, so that efficient defrosting can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a defrosting heating power circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a defrosting heating power circuit according to an embodiment of the present invention;
fig. 3 is a schematic view of a refrigerator according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a defrosting heating power circuit, including: a transformer 101, a power management module 102 and an output voltage detection module 103;
the transformer 101 is respectively connected with the power management module 102 and the output voltage detection module 103;
the power management module 102 is configured to convert a dc input voltage output by the high-voltage dc power supply into an ac input voltage, so as to send the ac input voltage to the transformer 101;
a transformer 101 for converting an ac input voltage to a dc output voltage;
the power management module 102 is further configured to regulate and transmit the dc output voltage to the output voltage detection module 103 according to a voltage feedback signal from the output voltage detection module 103 when the dc output voltage detected by the output voltage detection module 103 is smaller than a preset voltage threshold;
the output voltage detection module 103 is configured to detect the dc output voltage, and output the dc output voltage when the power management module 102 determines that the dc output voltage reaches a preset voltage threshold, so as to perform defrosting and heating by using the dc output voltage.
The defrosting heating power supply circuit provided by the embodiment of the utility model comprises a transformer, a power supply management module and an output voltage detection module, wherein the transformer is respectively connected with the power supply management module and the output voltage detection module, the power supply management module converts a direct current input voltage output by a high-voltage direct current power supply into an alternating current input voltage and sends the alternating current input voltage to the transformer so as to convert the alternating current input voltage into a direct current output voltage by the transformer, the output voltage detection module is used for detecting the direct current output voltage, when the power supply management module determines that the direct current output voltage is less than a preset voltage threshold value, the direct current output voltage is further regulated and transmitted to the direct current output voltage according to a voltage feedback signal until the direct current output voltage reaches the preset voltage threshold value, the direct current output voltage is output to carry out defrosting heating, so that the output voltage is controlled to be stable, and the influence of the fluctuation of a mains supply power grid is avoided, further, the heater for defrosting and heating by using the output voltage is ensured to maintain constant power, so that efficient defrosting can be realized.
It should be noted that the dc input voltage output by the high-voltage dc power supply is high-voltage dc, wherein the dc input voltage is 240V to 400V.
In one embodiment of the utility model, as shown in FIG. 2, the power management module 102 includes: the power supply comprises a driving circuit, a power management auxiliary circuit, a power chip U1, a power supply circuit and a follow current circuit;
the driving circuit is respectively connected with the direct current input voltage and the power chip U1;
the power supply chip U1 is connected with a power supply management accessory circuit;
the power management auxiliary circuit is respectively connected with the power chip U1 and the transformer 101;
the driving circuit is used for controlling the on-off of the driving circuit according to the PWM control signal from the power chip U1 so as to convert the direct-current input voltage into alternating-current input voltage;
the power chip U1 is configured to adjust and transmit the dc output voltage to the output voltage detection module 103 according to a voltage feedback signal from the output voltage detection module 103 when the dc output voltage detected by the output voltage detection module 103 is smaller than a preset voltage threshold;
the power management auxiliary circuit is used for providing electric energy for the first start of the power chip U1 and filtering a voltage feedback signal from the output voltage detection module 103;
the power supply circuit is used for supplying power to the power chip U1;
and the freewheeling circuit is used for providing a current loop for the winding inductor of the transformer 101.
In one embodiment of the present invention, as shown in fig. 2, the driving circuit includes: the circuit comprises a first MOS tube Q1, a first diode VD1, a first resistor R4, a second resistor R13 and a third resistor R14;
the direct current input voltage is input to a drain electrode of a first MOS tube Q1, a grid electrode and a source electrode of the first MOS tube Q1 are respectively connected with two ends of a first resistor R4, a grid electrode of the first MOS tube Q1 is connected with an anode of a first diode VD1, a cathode of the first diode VD1 is connected with a first end of a third resistor R14, a second end of the third resistor R14 is connected with a first end of the second resistor R13, a second end of the second resistor R13 is connected with an anode of the first diode VD1, and a first pin 1 of a power chip U1 is connected with a second end of the third resistor R14.
In particular, the amount of the solvent to be used,
the dc input voltage is inputted to the first MOS transistor Q1, and the PWM control signal provided by the power chip U1 is connected to the first resistor R4, the second resistor R13, the third resistor R14 and the first diode VD1 to control the on/off of the first MOS transistor Q1, so as to form a square wave ac voltage with high frequency. Make drive circuit realize the control to the transformer through controlling first MOS pipe Q1 turn on/off to utilize the transformer to realize electromagnetic energy conversion, with direct current input voltage conversion to alternating current input voltage, thereby control whole defrosting heating power supply circuit's output voltage.
In one embodiment of the present invention, as shown in fig. 2, the power management accessory circuit includes: a fourth resistor R6, a fifth resistor R7, a sixth resistor R12, a seventh resistor R15, an eighth resistor R11, a ninth resistor R20, a first capacitor C2, a second capacitor C3, a third capacitor C6 and a photoelectric coupler N1;
the second pin 2 of the power chip U1 is connected to the first end of the first capacitor C2, and the second end of the first capacitor C2 is connected to the third pin 3 of the power chip U1;
a first end of a first winding of the transformer 101 is connected with a second end of a first capacitor C2, a first end of a fourth resistor R6 is connected with a first end of a first capacitor C2, a second end of a fourth resistor R6 is connected with a driving circuit, a second end of a fifth resistor R7 is connected with a first end of a sixth resistor R12, a second end of a sixth resistor R12 is connected with a first end of a seventh resistor R15, a second end of the seventh resistor R15 is connected with a second end of a first capacitor C2, a seventh resistor R15 is connected with a second capacitor C3 in parallel, and a first end of the seventh resistor R15 is connected with a fourth pin 4 of a power chip U1;
the high-voltage direct-current power supply is connected with the first end of the eighth resistor R11, the second end of the eighth resistor R11 is connected with the first end of the ninth resistor R20, and the second end of the ninth resistor R20 is connected with the fifth pin 5 of the power chip U1;
the first end of the third capacitor C6 is connected with the first pin of the photoelectric coupler N1, the second end of the third capacitor C6 is connected with the second pin of the photoelectric coupler N1, and the first end of the third capacitor C6 is connected with the sixth pin 6 of the power chip U1.
In particular, the amount of the solvent to be used,
when the power chip U1 is started for the first time, a high-voltage direct-current power supply passes through a high-voltage starting resistor, namely an eighth resistor R11 and a ninth resistor R20 to reach a fifth pin 5 of the power chip U1, so that electric energy is provided for the power chip U1; the fifth resistor R7, the sixth resistor R12, the seventh resistor R15 and the second capacitor C3 which are connected with the fourth pin 4 of the power chip U1 can detect whether the input voltage is abnormal or not, and have an overvoltage/undervoltage protection function, when the input voltage of the high-voltage direct-current power supply is abnormal (the direct-current input voltage is higher than 400V or lower than 240V), the power chip U1 enters a protection mode, so that the defrosting heating power supply is in a low-power-consumption standby state; the third capacitor C6 is an over-feedback filter capacitor, can perform filtering processing, and is a smooth and stable voltage feedback signal passing through the photoelectric coupler N1; the fourth resistor R6 and the first capacitor C2 form a current detection circuit, when the power chip U1 detects that the current passing through the twelfth resistor R1 exceeds a preset current threshold, the power chip U1 enters an overcurrent protection link, and the power chip U1 stops working.
In one embodiment of the present invention, as shown in fig. 2, the power supply circuit includes: a tenth resistor R8, an eleventh resistor R27, a fourth capacitor C9, a fifth capacitor C8, a sixth capacitor C7, a second diode VD2, a third diode VD4, a first triode V2 and a first voltage-stabilizing diode ZD 1;
the second end of the first winding of the transformer is connected with the first end of a tenth resistor R8, the second end of the tenth resistor is connected with the anode of a second diode VD2, the cathode of the second diode VD2 is connected with the first end of an eleventh resistor R27, the second end of an eleventh resistor R27 is connected with the first end of a fourth capacitor C9, the second end of a fourth capacitor C9 is connected with the anode of a first zener diode ZD1, the cathode of the first zener diode ZD1 is connected with the base of a first triode V2, the collector of the first triode V2 is connected with the first end of an eleventh resistor R27, the emitter of the first triode V2 is connected with the anode of a third diode V2, the cathode of the third diode VD4 is connected with one end of a fifth capacitor C8, the fifth capacitor C8 is connected with a sixth capacitor C7, and one end of the sixth capacitor C7 is connected with the seventh pin 7 of the power supply chip U1.
In particular, the amount of the solvent to be used,
the transformer 101 is used for limiting current through a tenth resistor R8 through a winding 'electro-magnetic-electric', a second diode VD2 is used for converting alternating current input voltage obtained by a driving circuit into unstable direct current low-voltage through rectification, a linear voltage stabilizing circuit consisting of an eleventh resistor R27, a fourth capacitor C9, a first voltage stabilizing diode ZD1, a first triode V2 and a third diode VD4 is used for converting the unstable direct current low-voltage into stable direct current low-voltage, and finally a fifth capacitor C8 and a sixth capacitor C7 are used for filtering and supplying power to a power chip U1.
In one embodiment of the utility model, as shown in fig. 2, the freewheel circuit comprises: a twelfth resistor R1 and a fourth diode VD 3;
a first end of the twelfth resistor R1 is connected with the driving circuit, a second end of the twelfth resistor R1 is connected with the cathode of the fourth diode VD3, and the anode of the fourth diode VD3 is grounded; the cathode of the fourth diode VD3 is connected to the first end of the second winding of the transformer.
In particular, the amount of the solvent to be used,
the high-frequency square wave high-voltage alternating current formed by the driving circuit passes through the twelfth resistor R1 and the transformer 101, and the characteristic that the inductance of a transformer winding is continuous and can not suddenly change through the inductive current and the characteristic that the capacitance is smooth and filter are utilized, so that the high-frequency square wave high-voltage alternating current is converted into medium-high voltage direct current voltage (220V), and then the medium-high voltage direct current voltage is supplied to the load heater through the direct current output end, and defrosting is carried out by utilizing the heater. Since the current passing through the inductor cannot change abruptly, when the first MOS transistor Q1 is turned off, the transformer 101 needs continuous current to supplement, and therefore, a current loop is provided for the inductor by the fourth diode VD3 in the freewheeling circuit.
In one embodiment of the present invention, as shown in fig. 2, the output voltage detection module includes: a feedback circuit and an integrating circuit;
the feedback circuit is used for detecting the direct current output voltage and returning a voltage feedback signal to the power supply management module according to the detected direct current output voltage;
and the integrating circuit is used for stabilizing the voltage feedback signal.
In one embodiment of the present invention, as shown in figure 2,
the feedback circuit includes: a thirteenth resistor R2, a fourteenth resistor R10, a fifteenth resistor R17, a sixteenth resistor R24, a seventeenth resistor R5, an eighteenth resistor R16, a nineteenth resistor R22, a twentieth resistor R26, a twenty-first resistor R19, a twenty-second resistor R23, a seventh capacitor C1, an eighth capacitor C4, a second zener diode D1, a photocoupler N1, a three-terminal regulator U2 and a second triode V1;
a first end of the seventh capacitor C1 is connected with the second end of the second winding of the transformer, and a first end of the seventh capacitor C1 is grounded;
one end of a thirteenth resistor R2 is connected with a first end of a seventh capacitor C1, a thirteenth resistor R2, a fourteenth resistor R10 and a fifteenth resistor R17 are connected in series, one end of a fifteenth resistor R17 is connected with a third pin of a photoelectric coupler N1, a fourth pin of the photoelectric coupler N1 is connected with a cathode of a three-terminal regulator U2, a reference electrode of the three-terminal U2 is connected with a first end of a twentieth resistor R26, an anode of the three-terminal regulator U2 is connected with an emitter of a second triode V1, an emitter and a base of the second triode V1 are respectively connected with two pin ports, a collector of the second triode V1 is connected with a first end of a sixteenth resistor R24, a second end of the sixteenth resistor R24 is connected with a fourth pin of the photoelectric coupler N1, an eighth capacitor C4 is connected with a second zener diode 1, a first end of an eighth capacitor C4 is connected with a first end of a fifteenth resistor R17, a first end of the eighth capacitor C4 is connected to an emitter of the second transistor V1;
one end of a seventeenth resistor R5 is connected with the first end of a seventh capacitor C1, a seventeenth resistor R5, an eighteenth resistor R16, a nineteenth resistor R22 and a twentieth resistor R26 are connected in series, the second end of a twentieth resistor R26 is connected with the anode of a three-terminal regulator U2, a twenty-first resistor R19 is connected with a twenty-second resistor R23 in series, one end of the twenty-first resistor R19 is connected with the first end of a seventh capacitor C1, and one end of the twenty-second resistor R23 is connected with the second end of a twentieth resistor R26;
the integrating circuit includes: a twenty-third resistor R25, a twenty-fourth resistor R21, and a ninth capacitor C5;
the first end of the ninth capacitor C5 is connected to the fourth pin of the photocoupler N1, the second end of the ninth capacitor C5 is connected to the first end of the twenty-third resistor R25, the second end of the twenty-third resistor R25 is connected to the first end of the twentieth resistor R26, the first end of the twenty-fourth resistor R21 is connected to the third pin of the photocoupler N1, and the second end of the twenty-fourth resistor R21 is connected to the fourth pin of the photocoupler N1.
In particular, the amount of the solvent to be used,
the seventh capacitor C1 is a filter capacitor, and is used for reducing ripple noise of the dc output voltage after passing through the transformer and removing interference.
The emitter and the base of the second triode V1 are respectively connected with two pin ports for outputting voltage control signals.
The feedback circuit divides voltage through a seventeenth resistor R5, an eighteenth resistor R16, a nineteenth resistor R22 and a twentieth resistor R26 to detect output voltage, then transmits a divided voltage signal to a three-terminal regulator U2(TL431), and the three-terminal regulator U2 controls currents of a photoelectric coupler N1 and a three-terminal regulator U2 according to the divided voltage signal, so that the amplification factor of the photoelectric coupler N1 is controlled, the output voltage signal is fed back to a power supply chip U1 in an isolation mode, and the power supply chip U1 controls the on-off time of a first MOS tube Q1 through the voltage feedback signal, so that further control over the output voltage is achieved, and the accuracy of the output voltage is improved.
The thirteenth resistor R2, the fourteenth resistor R10 and the fifteenth resistor R17 in the feedback circuit are all optical coupling current-limiting resistors. The eighth capacitor C4 is an electrolytic capacitor, and the second zener diode D1 provides a stable voltage signal to the photocoupler N1, thereby protecting the photocoupler N1. The second triode V1 and the sixteenth resistor R24 form an output control circuit, and the direct current output voltage can be controlled to be adjusted between 180V and 230V through externally inputting 0-0.5V direct current voltage. The feedback circuit generates a voltage feedback signal by the output voltage supplied to the refrigerator, and further sends the voltage feedback signal to the power chip U1, thereby realizing accurate control of the output voltage. Therefore, the high-precision voltage stabilizing function is realized, and the efficiency of the whole defrosting heating power supply is improved.
The integrating circuit prevents the three-terminal regulator U2 from detecting signal sudden change through a twenty-third resistor R25, a twenty-fourth resistor R21 and a ninth capacitor C5.
As shown in fig. 3, in one embodiment of the present invention, there is provided a refrigerator including: a refrigerator body 301 and a defrosting heating power supply circuit 302 provided by any one of the above embodiments;
the refrigerator body 301 is connected with a defrosting heating power circuit 302;
the refrigerator comprises a refrigerator body 301, a defrosting heating power circuit 302, a heating device and a defrosting control circuit, wherein the refrigerator body 301 is used for heating a heater in the refrigerator body 301 to finish defrosting.
It should be noted that the heater may also be a heating wire. In fig. 2, the dc input terminal at the left end is a high voltage dc power supply terminal, and the dc output terminal at the right end is a dc output voltage output terminal, and the dc output terminal is connected to a heater in the refrigerator body.
An embodiment of the utility model provides a refrigerator, which comprises a refrigerator body, a transformer, a power management module and an output voltage detection module, wherein the power management module converts a direct current input voltage output by a high-voltage direct current power supply into an alternating current input voltage, converts the alternating current input voltage into a direct current output voltage by the transformer, detects the direct current output voltage by the output voltage detection module, and adjusts the output voltage according to a voltage feedback signal returned by the output voltage detection module, so that stable direct current output voltage is ensured to be output, stable voltage is provided for a heater of the refrigerator body, and the heater is defrosted at constant power without being influenced by mains supply fluctuation, thereby improving defrosting efficiency, meeting the requirements of a high-energy-efficiency refrigerator and saving more energy of the refrigerator.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a" does not exclude the presence of other similar elements in a process, method, article, or apparatus that comprises the element.
Finally, it is to be noted that: the above description is only a preferred embodiment of the present invention, and is only used to illustrate the technical solutions of the present invention, and not to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (9)
1. A defrosting heating power supply circuit is characterized by comprising: the device comprises a transformer, a power management module and an output voltage detection module;
the transformer is respectively connected with the power management module and the output voltage detection module;
the power supply management module is used for converting a direct-current input voltage output by the high-voltage direct-current power supply into an alternating-current input voltage so as to send the alternating-current input voltage to the transformer;
the transformer is used for converting the alternating current input voltage into direct current output voltage;
the power supply management module is further configured to adjust and transmit the dc output voltage to the output voltage detection module according to a voltage feedback signal from the output voltage detection module when the dc output voltage detected by the output voltage detection module is smaller than a preset voltage threshold;
the output voltage detection module is used for detecting the direct current output voltage, and when the power management module determines that the direct current output voltage reaches the state that the direct current output voltage is smaller than a preset voltage threshold value, the output voltage detection module outputs the direct current output voltage according to a voltage feedback signal from the output voltage detection module when the direct current output voltage is adjusted and transmitted to the direct current output voltage preset voltage threshold value, so that the direct current output voltage is utilized for defrosting and heating.
2. The defrosting heating power supply circuit of claim 1 wherein the power management module comprises: the power supply comprises a driving circuit, a power management auxiliary circuit, a power chip, a power supply circuit and a follow current circuit;
the driving circuit is respectively connected with the direct current input voltage and the power supply chip;
the power supply chip is connected with the power supply management auxiliary circuit;
the power management auxiliary circuit is respectively connected with the power chip and the transformer;
the driving circuit is used for controlling the on-off of the driving circuit according to a PWM control signal from the power supply chip so as to convert the direct current input voltage into the alternating current input voltage;
the power supply chip is used for regulating and transmitting the direct current output voltage to the direct current output voltage according to a voltage feedback signal from the output voltage detection module when the direct current output voltage detected by the output voltage detection module is smaller than a preset voltage threshold;
the power supply management auxiliary circuit is used for providing electric energy for the first start of the power supply chip and filtering the voltage feedback signal from the output voltage detection module;
the power supply circuit is used for supplying power to the power supply chip;
and the follow current circuit is used for providing a current loop for the winding inductance of the transformer.
3. The defrosting heating power supply circuit according to claim 2,
the drive circuit includes: the circuit comprises a first MOS tube, a first diode, a first resistor, a second resistor and a third resistor;
the direct-current input voltage is input to a drain electrode of the first MOS tube, a grid electrode and a source electrode of the first MOS tube are respectively connected with two ends of the first resistor, the grid electrode of the first MOS tube is connected with an anode of the first diode, a cathode of the first diode is connected with a first end of the third resistor, a second end of the third resistor is connected with a first end of the second resistor, a second end of the second resistor is connected with an anode of the first diode, and a first pin of the power chip is connected with a second end of the third resistor.
4. The defrosting heating power supply circuit according to claim 2,
the power management accessory circuit includes: the photoelectric coupler comprises a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first capacitor, a second capacitor, a third capacitor and a photoelectric coupler;
a second pin of the power supply chip is connected with a first end of the first capacitor, and a second end of the first capacitor is connected with a third pin of the power supply chip;
a first end of a first winding of the transformer is connected with a second end of the first capacitor, a first end of a fourth resistor is connected with the first end of the first capacitor, a second end of the fourth resistor is connected with the driving circuit, a second end of a fifth resistor is connected with a first end of a sixth resistor, a second end of the sixth resistor is connected with a first end of a seventh resistor, a second end of the seventh resistor is connected with a second end of the first capacitor, the seventh resistor is connected with the second capacitor in parallel, and a first end of the seventh resistor is connected with a fourth pin of the power chip;
the high-voltage direct-current power supply is connected with a first end of the eighth resistor, a second end of the eighth resistor is connected with a first end of the ninth resistor, and a second end of the ninth resistor is connected with a fifth pin of the power supply chip;
the first end of the third capacitor is connected with the first pin of the photoelectric coupler, the second end of the third capacitor is connected with the second pin of the photoelectric coupler, and the first end of the third capacitor is connected with the sixth pin of the power chip.
5. The defrosting heating power supply circuit according to claim 2,
the power supply circuit includes: a tenth resistor, an eleventh resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a second diode, a third diode, a first triode and a first voltage stabilizing diode;
a second end of the first winding of the transformer is connected with a first end of the tenth resistor, a second end of the tenth resistor is connected with an anode of the second diode, the cathode of the second diode is connected with the first end of the eleventh resistor, the second end of the eleventh resistor is connected with the first end of the fourth capacitor, the second end of the fourth capacitor is connected with the anode of the first voltage-stabilizing diode, the cathode of the first voltage-stabilizing diode is connected with the base electrode of the first triode, a collector of the first triode is connected with a first end of the eleventh resistor, an emitter of the first triode is connected with an anode of the third diode, the negative electrode of the third diode is connected with one end of a fifth capacitor, the fifth capacitor is connected with the sixth capacitor in parallel, and one end of the sixth capacitor is connected with a seventh pin of the power chip.
6. The defrosting heating power supply circuit according to claim 2,
the freewheel circuit includes: a twelfth resistor and a fourth diode;
a first end of the twelfth resistor is connected with the driving circuit, a second end of the twelfth resistor is connected with a cathode of the fourth diode, and an anode of the fourth diode is grounded; and the cathode of the fourth diode is connected with the first end of the second winding of the transformer.
7. The defrosting heating power supply circuit according to claim 1, wherein the output voltage detection module includes: a feedback circuit and an integrating circuit;
the feedback circuit is used for detecting the direct current output voltage and returning the voltage feedback signal to the power supply management module according to the detected direct current output voltage;
the integrating circuit is used for stabilizing the voltage feedback signal.
8. The defrosting heating power supply circuit according to claim 7,
the feedback circuit includes: a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a seventh capacitor, an eighth capacitor, a second zener diode, a photoelectric coupler, a three-terminal regulator and a second triode;
the first end of the seventh capacitor is connected with the second end of the second winding of the transformer, and the first end of the seventh capacitor is grounded;
one end of the thirteenth resistor is connected with the first end of the seventh capacitor, the thirteenth resistor, the fourteenth resistor and the fifteenth resistor are connected in series, one end of the fifteenth resistor is connected with the third pin of the photoelectric coupler, the fourth pin of the photoelectric coupler is connected with the cathode of the three-terminal regulator, the reference electrode of the three-terminal regulator is connected with the first end of the twentieth resistor, the anode of the three-terminal regulator is connected with the emitter of the second triode, the emitter and the base of the second triode are respectively connected with two pin ports, the collector of the second triode is connected with the first end of the sixteenth resistor, the second end of the sixteenth resistor is connected with the fourth pin of the photoelectric coupler, and the eighth capacitor is connected with the second zener diode in parallel, a first end of the eighth capacitor is connected with one end of the fifteenth resistor, and a first end of the eighth capacitor is connected with an emitter of the second triode;
one end of the seventeenth resistor is connected with the first end of the seventh capacitor, the seventeenth resistor, the eighteenth resistor, the nineteenth resistor and the twentieth resistor are connected in series, the second end of the twentieth resistor is connected with the anode of the three-terminal regulator, the twenty-first resistor is connected in series with the twenty-second resistor, one end of the twenty-first resistor is connected with the first end of the seventh capacitor, and one end of the twenty-second resistor is connected with the second end of the twentieth resistor;
the integration circuit includes: a twenty-third resistor, a twenty-fourth resistor, and a ninth capacitor;
the first end of the ninth capacitor is connected with the fourth pin of the photoelectric coupler, the second end of the ninth capacitor is connected with the first end of the twenty-third resistor, the second end of the twenty-third resistor is connected with the first end of the twentieth resistor, the first end of the twenty-fourth resistor is connected with the third pin of the photoelectric coupler, and the second end of the twenty-fourth resistor is connected with the fourth pin of the photoelectric coupler.
9. A refrigerator, characterized by comprising: a refrigerator body and the defrosting heating power circuit of any one of claims 1 to 8;
the refrigerator body is connected with the defrosting heating power circuit;
the refrigerator body is used for heating the heater in the refrigerator body by using the defrosting heating power supply circuit so as to finish defrosting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121026714.1U CN215337251U (en) | 2021-05-14 | 2021-05-14 | Defrosting heating power supply circuit and refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121026714.1U CN215337251U (en) | 2021-05-14 | 2021-05-14 | Defrosting heating power supply circuit and refrigerator |
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| Publication Number | Publication Date |
|---|---|
| CN215337251U true CN215337251U (en) | 2021-12-28 |
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| CN202121026714.1U Active CN215337251U (en) | 2021-05-14 | 2021-05-14 | Defrosting heating power supply circuit and refrigerator |
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| CN (1) | CN215337251U (en) |
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