CN110986424A - Low-power-consumption refrigerating sheet system - Google Patents
Low-power-consumption refrigerating sheet system Download PDFInfo
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- CN110986424A CN110986424A CN201911324292.3A CN201911324292A CN110986424A CN 110986424 A CN110986424 A CN 110986424A CN 201911324292 A CN201911324292 A CN 201911324292A CN 110986424 A CN110986424 A CN 110986424A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B21/00—Machines, plants or systems, using electric or magnetic effects
- F25B21/02—Machines, plants or systems, using electric or magnetic effects using Peltier effect; using Nernst-Ettinghausen effect
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
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Abstract
The invention relates to a low-power-consumption refrigerating sheet system, which comprises a power supply circuit, a power supply management circuit, a control circuit and a feedback circuit, wherein the power supply management circuit is connected with the power supply circuit; the input end of the power management circuit is connected with commercial power, and the output end of the power management circuit is connected with the refrigerating sheet to provide direct current for the refrigerating sheet; the power management circuit outputs a switch control signal to a control end of a semiconductor switch of the power management circuit; the control circuit has a proportional-integral regulating function and outputs a regulating voltage to the feedback circuit; the feedback circuit outputs the adjusting signal to the input end of the power management circuit. According to the invention, through the reasonable arrangement of the control circuit and the feedback circuit, the refrigeration sheet can realize the work with low power consumption and high efficiency; in addition, because the temperature protection circuit is additionally arranged and is associated with the feedback circuit, the reliable overheat protection of the refrigeration piece is realized.
Description
Technical Field
The invention relates to a refrigerating sheet for a refrigerating device, in particular to a low-power-consumption refrigerating sheet system.
Background
The semiconductor refrigerating plate is a heat pump. The semiconductor refrigerating sheet is not provided with a sliding component, so that the semiconductor refrigerating sheet is very suitable for being applied to occasions with limited space, high reliability requirement and no refrigerant pollution. By using the Peltier effect of the semiconductor materials, when direct current passes through a galvanic couple formed by connecting two different semiconductor materials in series, heat can be absorbed and released at two ends of the galvanic couple respectively, and the aim of refrigeration can be fulfilled. However, semiconductor cooling fins consume high energy and are easily damaged when overheated.
Disclosure of Invention
The invention aims to provide a refrigerating sheet system with low power consumption or overheating protection during operation, so as to solve the problems in the prior art.
In order to solve the technical problems, the invention adopts the technical scheme that: a low-power consumption refrigerating sheet system comprises a power supply circuit, a switching power supply controller and a control circuit;
the control circuit has a first input terminal, a second input terminal and an output terminal;
the input end of the power supply circuit is connected with commercial power; the output end of the power supply circuit is connected with the refrigerating sheet and provides direct current for the refrigerating sheet; the power circuit further comprises a semiconductor switch; the switching power supply controller is provided with an input end and an output end, and the output end outputs a switching control signal to the control end of the semiconductor switch of the power supply circuit;
a first input end and a second input end of the control circuit are respectively connected with a first reference voltage and a first detection voltage; the first detection voltage is related to the actual temperature of the refrigeration chip system; the first reference voltage is related to a target temperature of the refrigeration pill system; the control circuit has a proportional-integral regulating function;
the refrigerating sheet system further comprises a feedback circuit; the feedback circuit is provided with a first input end and an output end;
the first input end of the feedback circuit is connected with the output end of the control circuit; and the output end of the feedback circuit is connected with the input end of the switching power supply controller.
As a further solution, the feedback circuit further has a second input terminal; the refrigerating sheet system further comprises a temperature protection circuit, wherein the temperature protection circuit comprises a first input end, a second input end and an output end; the first input end and the second input end are respectively connected with a second reference voltage and a second detection voltage, and the second reference voltage; the second reference voltage is related to the limit temperature of the refrigeration piece, and the second detection voltage is related to the actual temperature of the refrigeration piece; the output end outputs an over-temperature protection signal; when a fault of over-high temperature occurs, the over-temperature protection signal is effective; when the over-temperature fault does not occur, the over-temperature protection signal is invalid.
As a further solution, the power circuit includes a transformer having a primary winding and a secondary winding, the primary winding is connected to the first end of the semiconductor switch, and the second end of the semiconductor switch is grounded via a detection resistor; the secondary winding outputs the direct current.
As a further solution, the switching power supply controller includes a switching power supply controller chip for switching power supply control, an input end of the switching power supply controller chip is an input end of the switching power supply controller, and the input end is connected with an output end of the feedback circuit; the output end of the switching power supply controller chip is the output end of the switching power supply controller, and the output end is connected with the control end of the semiconductor switch.
As a further solution, the control circuit comprises an operational amplifier, a non-inverting input of the operational amplifier being the second input of the control circuit, and an inverting input of the operational amplifier being the first input of the control circuit; the output end of the operational amplifier is the output end of the control circuit;
and a fourth resistor and a first capacitor are connected between the first input end and the output end of the control circuit, and the fourth resistor and the first capacitor are connected in parallel.
As a further solution, the refrigerating sheet system further comprises a first detection voltage generating circuit connected between the direct current power supply and the ground; the first detection voltage generation circuit comprises a second resistor, a third resistor and a first negative temperature coefficient thermistor which are sequentially connected in series between a direct current power supply and the ground in parallel;
a connecting node of a parallel circuit formed by the second resistor and the third resistor and the first negative temperature coefficient thermistor is connected with a second input end of the control circuit; and/or
The refrigerating sheet system also comprises a first reference voltage generating circuit connected between the direct current power supply and the ground; the first reference voltage generating circuit comprises a first resistor, an adjustable resistor, and resistors R61 and R62 which are connected in parallel, wherein the first resistor, the adjustable resistor and the resistors R61 and R62 are sequentially connected between a direct current power supply and the ground in series; and a connecting node between the first resistor and the adjustable resistor is connected with a second input end of the control circuit.
As a further solution, the feedback circuit includes a fifth resistor, an optocoupler device, an adjustable voltage regulator device, and a sixth resistor;
one end of the fifth resistor is connected with the output end of the power supply circuit, the other end of the fifth resistor is connected with the anode of a primary light-emitting diode of the optocoupler, the cathode of the light-emitting diode is connected with the cathode of the adjustable voltage regulator, and the anode of the adjustable voltage regulator is connected with the output end of the power supply circuit; one end of the sixth resistor is connected with the control end of the adjustable voltage stabilizing device and is connected with the output end of the power supply circuit through a seventh resistor, and the other end of the sixth resistor is grounded;
one end of the sixth resistor is a first input end of the feedback circuit;
and the collector of the triode at the secondary side of the optocoupler is connected with the input end of the switching power supply controller, and the emitter is grounded.
As a further solution, the sixth resistor comprises 2 resistors connected in parallel; and/or
One end of the sixth resistor is connected with the cathode of the adjustable voltage stabilizing device after passing through an eighth resistor and a second capacitor which are connected in series; and/or
And the two ends of the light-emitting diode are connected with a ninth resistor in parallel.
As a further solution, the temperature protection circuit includes a comparator, a non-inverting input terminal of the comparator is a first input terminal of the temperature protection circuit, an inverting input terminal of the comparator is a second input terminal of the temperature protection circuit, and an output terminal of the comparator is an output terminal of the temperature protection circuit;
the feedback circuit further comprises a triode, the base electrode of the triode is the second input end of the feedback circuit, the collector electrode of the triode is connected with the anode of the light emitting diode, and the emitter electrode of the triode is grounded.
As a further solution, the refrigerating sheet system further comprises a second detection voltage generating circuit connected between the direct current power supply and the ground;
the second detection voltage generation circuit comprises a tenth resistor and a second negative temperature coefficient thermistor which are sequentially connected in series; and a connecting node between the tenth resistor and the second negative temperature coefficient thermistor is connected with a second input end of the temperature protection circuit.
The invention has the following benefits:
through the reasonable arrangement of the control circuit and the feedback circuit, the refrigerating sheet can realize the work with low power consumption and high efficiency; in addition, because the temperature protection circuit is additionally arranged and is associated with the feedback circuit, the reliable overheat protection of the refrigeration piece is realized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a structural diagram of a low power consumption refrigeration sheet system according to a first embodiment.
Fig. 2 is a structural diagram of a low power consumption refrigerating sheet system according to a second embodiment.
Fig. 3 is a circuit diagram of a low power consumption refrigeration chip system.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, a refrigeration sheet system includes a power circuit, a refrigeration sheet, a switching power controller, a feedback circuit, and a control circuit. The input end of the main circuit of the power circuit is connected with commercial power, and the output end of the main circuit outputs the regulated direct current to supply power for the refrigeration sheet. The power circuit also includes a portion having a switching tube Q1. For example, the switching power supply may be configured by using the switching tube Q1 and a transformer. The control terminal of Q1 is the control terminal of the power circuit.
The control circuit has essentially two inputs IN11 and IN 12. The first input IN11 is connected to a reference voltage that is related to the desired temperature of the refrigeration unit IN which the refrigeration pill is located. The second input IN12 provides a sensed voltage that is related to the actual temperature of the refrigeration unit. The control circuit receives the reference voltage and the detection voltage, and outputs an adjustment voltage through operation. The refrigerating sheet system outputs proper direct current according to the adjusting voltage to supply power to the refrigerating sheet. Specifically, the regulated voltage passes through the feedback circuit and the switching power supply controller, and then outputs a control signal to the switching tube Q1 in the power supply circuit, and the output direct current is regulated by controlling the on-off of the switching tube Q1. The control circuit adopts a PI regulator, so that rapid regulation is realized when the difference between the actual temperature and the ideal temperature is large, and tiny accurate regulation is realized when the difference between the actual temperature and the ideal temperature is small. For example, at the starting position of the refrigerating device, the actual temperature is often not far higher than the ideal temperature, and the refrigerating sheet can be controlled to be in a high-power mode through the adjustment of the control circuit, so that the quick refrigeration is realized. After the refrigerating device is started for a period of time, when the difference value between the actual temperature and the ideal temperature is reduced to a certain range, the refrigerating sheet is in a low-power mode, accurate adjustment is achieved, and the temperature in the refrigerating device cannot be changed too much, so that power consumption is wasted. The control circuit is used for adjusting, so that a refrigerating sheet system with relatively low power consumption is realized.
The feedback circuit has an input terminal IN21 that receives the regulated voltage from the output terminal of the control circuit and outputs a feedback signal at its output terminal OUT 2. The feedback circuit feeds back the regulated voltage to the input end of the switching power supply controller.
The switching power supply controller has an input terminal IN3, the input terminal IN3 is connected to the output terminal OUT2 of the feedback circuit, and receives the feedback signal output by the output terminal OUT2 of the feedback circuit. The switching power supply controller also has an output terminal OUT3, which outputs a switching control signal OUT 3. Switching power controllers often include a switching power controller chip.
The power circuit is a switching power supply, which includes a switching tube Q1. The switch control signal output by the switch power supply controller controls the conduction and the closing of the switch tube Q1, so that the control power supply circuit outputs proper direct current to supply power to the refrigerating sheet.
The relationship or flow of signal transfer is given by the block diagram of the functional blocks in fig. 1. This is because the transfer and conversion of signals embody the main inventive concept of the present invention. The modules also require a supply voltage, which is not shown in the figure.
Example 2
Referring to fig. 2, the cooling fins are sensitive to overheating faults, and may be rapidly damaged after a certain temperature is exceeded. Therefore, in this embodiment, a temperature protection circuit is added. It has input terminals IN41 and IN42, and an output terminal OUT 4. The input IN41 is connected to a reference voltage signal which is related to the limit temperature of the refrigeration pill. The input IN42 is connected to a detection voltage signal which is related to the actual temperature of the cooling plate. When the temperature protection circuit detects that the temperature is too high, an over-temperature protection signal will be output at the output terminal OUT4 to the feedback circuit.
The feedback circuit has a second input IN22 that receives the over-temperature protection signal output by the output OUT 4. And enables or disables the feedback signal output based on the signal.
Example 3
Referring to fig. 3, a specific configuration of each specific circuit block is shown. The input end of the power circuit receives commercial power, and the commercial power passes through the filtering unit and then reaches the transformer unit. The primary winding of the transformer unit is connected with a switching tube Q1, and the secondary winding of the transformer outputs direct current to supply power for the refrigeration sheet.
The main element of the control circuit is a PI regulator composed of an operational amplifier U6A and peripheral circuits thereof. The operational amplifier in fig. 3 uses LM358, but other types of operational amplifier units may be used. The non-inverting input of the operational amplifier U6A is IN12 and the inverting input is IN 11. The non-inverting input of the operational amplifier U6A is connected to a sense voltage that is related to the actual temperature of the refrigeration unit. In fig. 3, the detection voltage is provided by a series circuit consisting of a +8V dc power supply, resistors R57 and R58 connected in parallel, and a negative temperature coefficient thermistor NTC 1. The detection voltage is output via a connection node of the resistors R57 and R58 connected in parallel and the negative temperature coefficient thermistor NTC 1. The inverting input of the operational amplifier U6A is connected to a reference voltage. The reference voltage is supplied via a series circuit of +8V dc power supply, an adjustable resistor of resistor R56 (CN13 in fig. 3 represents the adjustable resistor), and resistors R61 and R62 connected in parallel. The reference voltage is output via an adjustable resistor to the junction of the resistors R61 and R62 connected in parallel. The inverting input terminal of the operational amplifier U6A is connected to the output terminal of the operational amplifier U6A through a parallel circuit formed by a resistor R54 and a capacitor C14. The output end of the operational amplifier U6A outputs the regulated voltage to the feedback circuit after passing through the forward diode.
The feedback circuit has a power supply terminal connected to a DC supply voltage for supplying power to the entire feedback circuit. The feedback circuit comprises a resistor R44 connected with the power supply voltage in series, a light emitting diode of an optical coupler device and an adjustable voltage stabilizing device U3, wherein the light emitting diode is sequentially connected in the series circuit, and the other end of the series circuit is grounded. The control end of the adjustable voltage stabilizing device U3 is connected with the output end OUT1 of the control circuit through a resistor R51, and the control end of the adjustable voltage stabilizing device U3 is the input end IN21 of the feedback circuit.
The feedback circuit may further have the following arrangement. A resistor R37 is connected in parallel across the led to protect the led. The DC power supply, the resistor R43, and a series circuit formed by resistors R41 and R42 connected in parallel, wherein a connecting node between the resistor R43 and the resistors R41 and R42 connected in parallel is connected with the control end of the adjustable voltage stabilizing device U3. The resistors R41 and R42 connected in parallel may be replaced by one resistor. The parallel connected circuit structure enhances the stability of the circuit.
The feedback circuit may further have the following arrangement. The connection node between the resistor R43 and the parallel-connected resistors R41 and R42 is connected to the cathode of the adjustable voltage regulator device U3.
The switching power supply controller comprises a switching power supply controller chip. The switching power supply controller chip adopts a flyback controller or a primary side controller. Such as a flyback controller chip R7731A from RICHTEK TECHNOLOGY, or the like. Or primary side controller chip, such as Pump ExpressTMA series of primary side controller chips. Of course, other types of chips from other companies are possible. As long as it has a control function similar to that of the shape. Almost any switching power supply controller chip in the art has a control input, an output and a protection input. The triode part of the optocoupler is defined to be connected between the control input of the switching power supply controller chip and ground. The collector of the power supply is connected with the control input end of the switching power supply controller chip, and the emitter of the power supply is connected with the ground. The pin shown at the control input in fig. 3 is DMAG, but may also be COM, with different definitions depending on the type of chip. The output GATE of the switching power controller chip is the output OUT3 of the switching power controller. The output terminal is connected to the control terminal of the switching tube Q1 in the power circuit. The type of the switching tube Q1 is an NMOS tube. The drain of the NMOS transistor Q1 is connected to the primary winding of the transformer, and the source is connected to ground through a resistor RS 1. The other end of the power supply RS1 is connected to the feedback terminal (CS terminal in fig. 3) of the switching power supply controller chip.
Example 4
Refer to fig. 3. The temperature protection circuit includes a comparator U7 and its peripheral circuits. The non-inverting input terminal IN41 and the inverting input terminal of the comparator U7 are input terminals IN 42. The parallel circuit of the DC power supply +8V and the resistors R66, R63 and R59 forms a series circuit. The connection node of the parallel circuit formed by the R63 and the R59 and the resistor R66 is connected with the non-inverting input end of the comparator U7 to provide a reference voltage. The direct current power supply +8V, the resistor R60 and the negative temperature coefficient thermistor NTC2 form a series circuit, and a connecting node between the resistor R60 and the negative temperature coefficient thermistor NTC2 is connected with the inverting input end of the comparator U7 to provide detection voltage. The negative temperature coefficient thermistor NTC2 can also be replaced by a positive temperature coefficient thermistor, and the connection relationship between the detection voltage and the reference voltage and the positive and negative phase input ends of the comparator can be replaced correspondingly. Or correspondingly, the effectiveness of the high-low comment of the output temperature protection signal is replaced.
The output terminal of the comparator U7, which is the output terminal OUT4, outputs a temperature protection signal, which is connected to the feedback circuit via the transistor Y1. The temperature protection signal is connected with the base electrode of an NPN triode Y1, the collector electrode of an NPN triode Y1 is connected with the anode of a light-emitting diode, and the transmitter of an NPN triode Y1 is connected with the cathode of an adjustable voltage stabilizing device U3. Therefore, when the temperature protection signal is high (active), the transistor Y1 is turned on, so that the light emitting diode cannot be turned on, the feedback circuit outputs a low level signal, and the transistor of the optocoupler is turned off. The temperature protection circuit is communicated with the switching power supply controller chip through the feedback circuit, so that the protection is more stable and reliable.
In conclusion, the refrigerating sheet can realize the work with low power consumption and high efficiency through the reasonable arrangement of the control circuit and the feedback circuit; in addition, because the temperature protection circuit is additionally arranged and is associated with the feedback circuit, the reliable overheat protection of the refrigeration piece is realized.
Claims (10)
1. A low-power-consumption refrigerating piece system comprises a power supply circuit, a switching power supply controller, a control circuit and a refrigerating piece;
the control circuit has a first input terminal (IN11), a second input terminal (IN12), and an output terminal (OUT 1);
the input end of the power supply circuit is connected with commercial power; the output end of the power supply circuit is connected with the refrigerating sheet and provides direct current for the refrigerating sheet; the power circuit further includes a semiconductor switch (Q1); the switching power supply controller has an input terminal (IN3) and an output terminal (OUT3), the output terminal (OUT3) outputting a switching control signal to a control terminal of the semiconductor switch (Q1) of the power supply circuit;
the method is characterized in that:
the first input end (IN11) and the second input end (IN12) of the control circuit are respectively connected with a first reference voltage and a first detection voltage; the first detection voltage is related to the actual temperature of the refrigeration chip system; the first reference voltage is related to a target temperature of the refrigeration pill system; the control circuit has a proportional-integral regulating function;
the refrigerating sheet system further comprises a feedback circuit; the feedback circuit has a first input terminal (IN21) and an output terminal (OUT 2);
a first input (IN21) of the feedback circuit is connected with an output (OUT1) of the control circuit;
the output (OUT2) of the feedback circuit is connected to the input (IN3) of the switching power supply controller.
2. The refrigerant pill system of claim 1,
the feedback circuit further has a second input terminal (IN 22);
the refrigeration pill system further comprises a temperature protection circuit comprising a first input (IN41), a second input (IN42), and an output (OUT 4); the first input end (IN41) and the second input end (IN42) are respectively connected with a second reference voltage and a second detection voltage, and the second reference voltage is connected with the first detection voltage; the second reference voltage is related to the limit temperature of the refrigeration piece, and the second detection voltage is related to the actual temperature of the refrigeration piece; the output end (OUT4) outputs an over-temperature protection signal; when a fault of over-high temperature occurs, the over-temperature protection signal is effective; when the over-temperature fault does not occur, the over-temperature protection signal is invalid.
3. A cold plate system as claimed in claim 1 or 2,
the power supply circuit comprises a transformer, the transformer is provided with a primary winding and a secondary winding, the primary winding is connected with a first end of a semiconductor switch (Q1), and a second end of the semiconductor switch (Q1) is grounded through a detection resistor (RS 1); the secondary winding outputs the direct current.
4. A cold plate system as claimed in claim 1 or 2,
the switching power supply controller comprises a switching power supply controller chip, wherein the input end of the switching power supply controller chip is the input end of the switching power supply controller and is connected with the output end (OUT2) of the feedback circuit; the output end of the switching power supply controller chip is the output end of the switching power supply controller, and the output end is connected with the control end of the semiconductor switch (Q1).
5. A cold plate system as claimed in claim 1 or 2,
the control circuit comprises an operational amplifier (U6A), a non-inverting input of the operational amplifier (U6A) being a second input (IN12) of the control circuit, an inverting input of the operational amplifier (U6A) being a first input (IN11) of the control circuit; the output end of the operational amplifier (U6A) is the output end (OUT1) of the control circuit;
a fourth resistor (R54) and a first capacitor (C14) are connected between the first input end (IN11) and the output end (OUT1) of the control circuit, and the fourth resistor (R54) and the first capacitor (C14) are connected IN parallel.
6. The refrigerant pill system of claim 5,
the refrigerating sheet system also comprises a first detection voltage generating circuit connected between the direct current power supply and the ground; the first detection voltage generation circuit comprises a second resistor (R57), a third resistor (R58) and a first negative temperature coefficient thermistor (NTC1) which are connected in series in parallel between a direct current power supply and the ground in sequence;
a connecting node of a parallel circuit formed by the second resistor (R57) and the third resistor (R58) and the first negative temperature coefficient thermistor (NTC1) is connected with a second input end (IN12) of the control circuit; and/or
The refrigerating sheet system also comprises a first reference voltage generating circuit connected between the direct current power supply and the ground; the first reference voltage generating circuit comprises a first resistor (R56), an adjustable resistor (CN13), resistors R61 and R62 which are connected in series between a direct current power supply and the ground in sequence; the connection node between the first resistor (R56) and the adjustable resistor (CN13) is connected to the second input terminal (IN12) of the control circuit.
7. A cold plate system as claimed in claim 1 or 2,
the feedback circuit comprises a fifth resistor (R44), an optical coupler device, an adjustable voltage stabilizing device (U3) and a sixth resistor;
one end of the fifth resistor (R44) is connected with the output end of the power supply circuit, the other end of the fifth resistor (R44) is connected with the anode of a light-emitting diode at the primary side of the optocoupler, the cathode of the light-emitting diode is connected with the cathode of the adjustable voltage regulator device (U3), and the anode of the adjustable voltage regulator device (U3) is connected with the output end of the power supply circuit; one end of the sixth resistor is connected with the control end of the adjustable voltage stabilizing device (U3), and is connected with the output end of the power supply circuit through a seventh resistor (R43), and the other end of the sixth resistor is grounded;
one end of the sixth resistor is a first input end (IN21) of the feedback circuit;
and the collector of the triode of the secondary side of the optocoupler is connected with the input end (IN3) of the switching power supply controller, and the emitter is grounded.
8. The refrigerant pill system of claim 7,
the sixth resistor comprises 2 resistors connected in parallel; and/or
One end of the sixth resistor is connected with the cathode of the adjustable voltage stabilizing device (U3) after passing through an eighth resistor (R40) and a second capacitor (C12) which are connected in series; and/or
And the two ends of the light-emitting diode are connected with a ninth resistor (R37) in parallel.
9. The refrigerant pill system of claim 7,
the temperature protection circuit comprises a comparator (U6B), wherein the non-inverting input end of the comparator (U6B) is a first input end (IN41) of the temperature protection circuit, the inverting input end of the comparator is a second input end (IN42) of the temperature protection circuit, and the output end of the comparator is an output end (OUT4) of the temperature protection circuit;
the feedback circuit further comprises a triode (Y1), the base of the triode (Y1) is the second input end (IN22) of the feedback circuit, the collector of the triode is connected with the anode of the light emitting diode, and the emitter of the triode is grounded.
10. The refrigerant pill system of claim 9,
the refrigerating sheet system also comprises a second detection voltage generation circuit connected between the direct current power supply and the ground;
the second detection voltage generation circuit includes a tenth resistor (R60) and a second negative temperature coefficient thermistor (NTC2) connected in series in this order; a connection node between the tenth resistor (R60) and the second negative temperature coefficient thermistor (NTC2) is connected to a second input terminal (IN42) of the temperature protection circuit.
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| CN2129910Y (en) * | 1992-08-12 | 1993-04-14 | 卢鸿科 | Semiconductor sterilization fresh-keeping refrigerator |
| US20030184941A1 (en) * | 2002-03-13 | 2003-10-02 | International Business Machines Corporation | Cooling device |
| CN201319151Y (en) * | 2008-12-02 | 2009-09-30 | 佛山市顺德区瑞德电子实业有限公司 | Refrigeration switch power supply for drinking fountain |
| CN101968664A (en) * | 2010-09-30 | 2011-02-09 | 东南大学 | Surface temperature signal fast generating device |
| CN202748681U (en) * | 2012-08-14 | 2013-02-20 | 宁波婷微电子科技有限公司 | Energy-saving controller of semiconductor refrigerator |
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| CN110986424B (en) | 2021-08-27 |
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