CN219776086U - Defrosting timing control circuit and defrosting timer - Google Patents
Defrosting timing control circuit and defrosting timer Download PDFInfo
- Publication number
- CN219776086U CN219776086U CN202321236750.XU CN202321236750U CN219776086U CN 219776086 U CN219776086 U CN 219776086U CN 202321236750 U CN202321236750 U CN 202321236750U CN 219776086 U CN219776086 U CN 219776086U
- Authority
- CN
- China
- Prior art keywords
- circuit
- power supply
- defrosting
- switching
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000010257 thawing Methods 0.000 title claims abstract description 134
- 238000005070 sampling Methods 0.000 claims abstract description 43
- 238000005057 refrigeration Methods 0.000 claims description 66
- 230000000087 stabilizing effect Effects 0.000 claims description 28
- 230000009467 reduction Effects 0.000 claims description 23
- 230000003044 adaptive effect Effects 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000006870 function Effects 0.000 description 20
- 239000003990 capacitor Substances 0.000 description 19
- 101100153768 Oryza sativa subsp. japonica TPR2 gene Proteins 0.000 description 12
- 101150102021 REL2 gene Proteins 0.000 description 12
- 101150037899 REL1 gene Proteins 0.000 description 11
- 101100099158 Xenopus laevis rela gene Proteins 0.000 description 11
- 238000010586 diagram Methods 0.000 description 9
- 230000006872 improvement Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Abstract
The utility model discloses a defrosting timing control circuit which comprises a rectifying circuit, a function switching circuit, a main control circuit and a sampling circuit, wherein the input end of the rectifying circuit and the sampling circuit are connected with a power live wire end of an external power supply module; the output end of the rectifying circuit is respectively connected with the main control circuit and the function switching circuit, and the sampling circuit is connected with the main control circuit; the function switching circuit comprises a first switching circuit and a second switching circuit, and the main control circuit is used for controlling the first switching circuit and the second switching circuit to work so as to realize the power supply loop of the conduction rectifying circuit and switch the work power supply loop of the conduction refrigerating module or the defrosting module. The utility model also discloses a defrosting timer. The utility model has the characteristics of simple circuit structure, low working noise, low cost, high timing accuracy, adjustable timing time, complete dual-purpose mechanical power supply circuit and the like.
Description
Technical Field
The utility model relates to the technical field of refrigeration equipment, in particular to a defrosting timing control circuit and a defrosting timer.
Background
The traditional defrosting timer of refrigeration equipment such as a refrigerator, a freezer and the like is a mechanical timer circuit formed by dragging a reduction gear system by a micro motor. However, the mechanical noise generated by the structure is large, the manufacturing cost is high, the timing error is large, and the adjustment of the refrigerating timing time and the defrosting timing time to switch the refrigerating or defrosting functions is inconvenient, so that the actual requirements of users cannot be met.
Along with development of the single chip microcomputer technology, at present, partial defrosting timers adopt the single chip microcomputer to realize defrosting and refrigerating timing control functions, but the circuit structure is complex, independent power supply is needed, the single chip microcomputer cannot be fully used with a mechanical power supply circuit, and the change of the power supply circuit leads to higher manufacturing cost.
Disclosure of Invention
The utility model aims to solve the technical problems of providing a defrosting timing control circuit and a defrosting timer with simple circuits, which have the characteristics of low working noise, low cost, high timing accuracy, adjustable refrigeration timing time and defrosting timing time, capability of completely using a mechanical power supply circuit and the like, and meet the actual demands of users.
In order to solve the technical problems, the utility model provides a defrosting timing control circuit which comprises a rectifying circuit, a function switching circuit, a main control circuit and a sampling circuit, wherein the input end of the rectifying circuit and the sampling circuit are connected with a power live wire end of an external power supply module; the output end of the rectifying circuit is respectively connected with the main control circuit and the function switching circuit, and the sampling circuit is connected with the main control circuit and is used for collecting the power-on signal and sending the power-on signal to the main control circuit; the function switching circuit comprises a first switching circuit and a second switching circuit, wherein the first switching circuit is respectively connected with the negative electrode output end of the rectifying circuit, the power live wire end and the refrigerating module and is used for switching and controlling the refrigerating module to be communicated with the negative electrode output end or the power live wire end of the rectifying circuit so as to conduct a power supply loop of the corresponding circuit; the second switch circuit is respectively connected with the power supply live wire end and the defrosting module and is used for controlling the on-off state of a loop between the defrosting module and the power supply live wire end; the negative electrode output end of the rectifying circuit is connected with the zero line end of the power supply through a defrosting module; the main control circuit is respectively connected with the first switch circuit and the second switch circuit and is used for conducting the power supply loop of the rectifying circuit and switching and conducting the working power supply loop of the refrigerating module or the defrosting module.
As an improvement of the above-described scheme, the rectifying circuit includes a switching power supply circuit and a step-down stabilizing circuit; the input end of the switching power supply circuit is connected with the live wire end of the power supply through an external refrigeration temperature controller, the negative electrode output end of the switching power supply circuit is connected with the first switching circuit, the positive electrode output end of the switching power supply circuit is respectively connected with the positive electrode input end of the voltage reduction stabilizing circuit and the power supply input ends of the first switching circuit and the second switching circuit, and the switching power supply circuit is used for converting alternating current of an external power supply module into first direct current so as to respectively supply power to the voltage reduction stabilizing circuit, the first switching circuit and the second switching circuit in an adaptive mode; the negative electrode output end of the voltage reduction stabilizing circuit is grounded and connected with the negative electrode output end of the switching power supply circuit and the defrosting module respectively, and the positive electrode output end of the voltage reduction stabilizing circuit is connected with the main control circuit and is used for performing voltage reduction conversion on the first direct current into the second direct current so as to supply power to the main control circuit in an adaptive manner.
As an improvement of the scheme, the first switch circuit comprises a first relay and a first switch tube, a first coil end of the first relay is connected with a positive electrode output end of the switch power supply circuit, a second coil end of the first relay is connected with a first end of the first switch tube, a normally closed terminal of the first relay is respectively connected with a negative electrode output end of the switch power supply circuit and a common terminal of the first relay, the common terminal of the first relay is connected with an input end of the refrigeration module, and a normally open terminal of the first relay is connected with a power line end of the power supply through the refrigeration temperature controller; the control end of the first switching tube is connected with the main control circuit, and the second end of the first switching tube is grounded.
As an improvement of the scheme, the second switching circuit comprises a second relay and a second switching tube, a first coil end of the second relay is connected with a positive electrode output end of the switching power supply circuit, a second coil end of the second relay is connected with a first end of the second switching tube, a common terminal of the second relay is connected with a power supply live wire end through a refrigeration temperature controller and is connected with a normally closed terminal of the second relay, and a normally open terminal of the second relay is connected with an input end of the defrosting module through an external defrosting temperature controller; the control end of the second switching tube is connected with the main control circuit, and the second end of the second switching tube is grounded.
As an improvement of the scheme, the sampling circuit comprises a first sampling resistor and a second sampling resistor, one end of the first sampling resistor is connected with the live wire end of the power supply through the refrigeration temperature controller, and the other end of the first sampling resistor is connected with the main control circuit through the second sampling resistor.
As the improvement of above-mentioned scheme, main control circuit includes main control chip, and main control chip's sampling pin is connected with sampling circuit's output, and main control chip's first control output pin is connected with first switch circuit's control end, and main control chip's second control output pin is connected with second switch circuit's control end, and main control chip's power pin is connected with step-down stabilizing circuit's positive pole output, and main control chip's ground pin ground connection.
As an improvement of the scheme, the main control circuit further comprises an external clock module and a control key, wherein the external clock module is respectively connected with the first clock pin and the second clock pin of the main control chip, one end of the control key is connected with the signal input pin of the main control chip, and the other end of the control key is grounded.
As an improvement of the above solution, the refrigeration module comprises a compressor and the defrosting module comprises a defrosting heater.
As an improvement of the scheme, a first diode is arranged between the negative electrode output end of the switching power supply circuit and the first switching circuit, the negative electrode output end of the switching power supply circuit is connected with the positive electrode end of the first diode, and the negative electrode end of the first diode is connected with the first switching circuit; a second diode is arranged between the negative electrode output end of the voltage reduction stabilizing circuit and the defrosting module, the negative electrode output end of the voltage reduction stabilizing circuit is connected with the positive electrode end of the second diode, and the negative electrode end of the second diode is connected with the defrosting module.
The utility model also provides a defrosting timer, which comprises a shell and a plurality of wiring terminals arranged on the shell, wherein the defrosting timing control circuit is arranged in the shell and is connected with the wiring terminals and used for being connected with an external device through the wiring terminals.
The implementation of the utility model has the following beneficial effects:
the defrosting timing control circuit and the defrosting timer have the characteristics of simple circuit structure, low working noise, low cost, high timing accuracy, capability of completely using a mechanical power supply circuit, adjustable refrigerating timing time and defrosting timing time and the like, and meet the actual demands of users.
Drawings
FIG. 1 is a schematic block diagram of a defrost timing control circuit of the present utility model;
FIG. 2 is a specific operational circuit diagram of the defrosting timing control circuit of the present utility model;
fig. 3 is a schematic structural diagram of the defrosting timer of the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present utility model more apparent.
As shown in fig. 1, fig. 1 shows a schematic structural diagram of a defrosting timing control circuit of the utility model, which comprises a rectifying circuit 1, a function switching circuit 2, a main control circuit 3 and a sampling circuit 4, wherein the input end of the rectifying circuit 1, the function switching circuit 2 and the sampling circuit 4 are all connected with a power live wire end of an external power supply module 5, and a power zero end of the external power supply module 5 is respectively connected with an external refrigeration module 6 and a defrosting module 7; the output end of the rectifying circuit 1 is respectively connected with the main control circuit 3 and the function switching circuit 2, and the sampling circuit 4 is connected with the main control circuit 3 and is used for collecting power-on signals and sending the power-on signals to the main control circuit 3; the function switching circuit 2 comprises a first switching circuit 21 and a second switching circuit 22, wherein the first switching circuit 21 is respectively connected with the negative electrode output end of the rectifying circuit 1, the power live wire end and the refrigerating module 6, and is used for switching and controlling the refrigerating module 6 to be communicated with the negative electrode output end or the power live wire end of the rectifying circuit 1 so as to conduct a power supply loop of a corresponding circuit; the second switch circuit 22 is respectively connected with the power supply live wire end and the defrosting module 7 and is used for controlling the on-off state of a loop between the defrosting module 7 and the power supply live wire end; the negative electrode output end of the rectifying circuit 1 is connected with a power zero line end through a defrosting module 7.
In the initial state, the refrigerating module 6 is communicated with the negative electrode output end of the rectifying circuit 1, and the defrosting module 7 is not communicated with the power supply live wire end. When power is input, the rectifying circuit 1 conducts a power supply loop of the rectifying circuit 1 through the refrigerating module 6 and the defrosting module 7, and the rectifying circuit 1 supplies power to the main control circuit 3 and the function switching circuit 2 in an adaptive mode. The main control circuit 3 is powered on to control the first switch circuit 21 to control the refrigeration module 6 to be communicated with a power line end of a power supply so as to conduct a working power supply loop between the refrigeration module 6 and the external power supply module 5, control the refrigeration module 6 to work and perform refrigeration timing, and the defrosting module 7 does not work; at this time, the rectifying circuit 1 conducts the power supply loop thereof through the defrosting module 7, and the rectifying circuit 1 continues the power supply work. When no power is input, the refrigerating module 6 returns to an initial connection state, the energy storage module of the rectifying circuit 1 supplies power for the main control circuit 3 for a short time, and at the moment, the main control circuit 3 stores the current refrigerating accumulated working time according to the low-level signal acquired by the sampling circuit 4; when the power is supplied again, the main control circuit 3 is electrified to control the refrigeration work and continuously performs accumulated timing according to the last stored refrigeration accumulated work time, so that the timing accuracy is high.
When the cooling accumulated working time of the main control circuit 3 reaches the preset cooling timing time, the main control circuit 3 respectively controls the first switch circuit 21 and the second switch circuit 22 to work, so that the cooling module 6 returns to the initial connection state and the defrosting module 7 is communicated with the live wire end of the power supply to conduct the working power supply loop between the defrosting module 7 and the external power supply module 5, and the defrosting module 7 works and performs defrosting timing, and the cooling module 6 does not work. At this time, the rectifying circuit 1 conducts the power supply loop of the rectifying circuit 1 through the refrigerating module 6 and the defrosting module 7 so as to realize uninterrupted power supply work of the rectifying circuit 1, and the whole circuit can completely use a mechanical power supply circuit without additional independent power supply or independent power supply circuit.
When the defrosting accumulated working time of the main control circuit 3 reaches the preset defrosting timing time, the main control circuit 3 respectively controls the first switch circuit 21 and the second switch circuit 22 to work, and the working power supply circuit of the refrigeration module 6 is turned on again and the working power supply circuit of the defrosting module 7 is turned off, and the power supply circuit of the rectification current is kept on, so that the refrigeration timing work and the defrosting timing work are sequentially realized. The preset refrigeration timing time and the preset defrosting timing time are adjustable, and the timing and timing accuracy is high.
The utility model has the characteristics of simple circuit structure, low working noise, low cost, high timing accuracy, complete dual-purpose mechanical power supply circuit, adjustable refrigeration timing time and defrosting timing time and the like, and meets the actual demands of users.
The utility model is described in further detail below with reference to specific circuit diagrams:
as shown in fig. 2, fig. 2 shows a specific operation circuit diagram of the defrosting timing control circuit of the present utility model.
It should be noted that, the circuit diagram of the dashed-line box in fig. 2 is a specific circuit diagram of the defrosting timing control circuit of the present utility model; the circuit outside the dashed box is an external circuit, i.e. a mechanical power supply line. The defrosting timing control circuit is connected with an external circuit through terminals 1, 2, 3 and 4 in the figure so as to be directly compatible with a mechanical power supply circuit, and has good compatibility effect without additional independent power supply. The circuit connection structures of the refrigeration temperature controller S1, the external power supply module 5, the refrigeration module 6, the defrosting temperature controller S2 and the defrosting module 7 are all external circuit structures. The refrigeration module 6 comprises a compressor 61 and the defrost module 7 comprises a defrost heater 71.
The rectifying circuit 1, the function switching circuit 2, the main control circuit 3, and the sampling circuit 4 are described below, respectively:
1. rectifying circuit 1
The rectifying circuit 1 includes a switching power supply circuit 11 and a step-down stabilizing circuit 12;
the input end of the switching power supply circuit 11 is connected with a power supply live wire end of the external power supply module 5 through an external refrigeration temperature controller S1, the negative electrode output end of the switching power supply circuit 11 is connected with the first switching circuit 21, the positive electrode output end of the switching power supply circuit 11 is respectively connected with the positive electrode input end of the voltage reduction stabilizing circuit 12 and the power supply input ends of the first switching circuit 21 and the second switching circuit 22, and the switching power supply circuit is used for converting alternating current of the external power supply module 5 into first direct current so as to respectively supply power to the voltage reduction stabilizing circuit 12, the first switching circuit 21 and the second switching circuit 22 in an adaptive mode; the negative electrode output end of the voltage reduction stabilizing circuit 12 is grounded and connected with the negative electrode output end of the switching power supply circuit 11 and the defrosting module 7 respectively, and the positive electrode output end of the voltage reduction stabilizing circuit 12 is connected with the main control circuit 3 and is used for converting the first direct current into the second direct current in a voltage reduction mode so as to supply power to the main control circuit 3 in an adapting mode. The power supply of the external power supply module 5 is preferably 100-240V ac, the first dc is 12V dc, and the second dc is 5V dc.
Preferably, a fifth diode D7 is arranged between the negative output end of the switching power supply circuit 11 and the first switching circuit 21, the negative output end of the switching power supply circuit 11 is connected with the positive end of the fifth diode D7, and the negative end of the fifth diode D7 is connected with the first switching circuit 21; a sixth diode D2 is arranged between the negative electrode output end of the voltage reduction stabilizing circuit 12 and the defrosting module 7, the negative electrode output end of the voltage reduction stabilizing circuit 12 is connected with the sixth diode D2, and the sixth diode D2 is connected with the defrosting module 7.
Specifically, the switching power supply circuit 11 includes a switching power supply chip IC1, a first resistor R1, a first diode D1, a first electrolytic capacitor C2, a second diode D3, a first capacitor C1, a third diode ZD1, a fourth diode D4, an inductance L2, and a second electrolytic capacitor C4.
The power supply fire wire end of the external power supply module 5 is sequentially connected with the positive electrode end of a first diode D1 through a refrigeration temperature controller S1 and a first resistor R1, the negative electrode end of the first diode D1 is connected with the power supply input end (pin 1) of a switching power supply chip IC1 and is grounded through a first electrolytic capacitor C2, the grounding end (pin 3) of the switching power supply chip IC1 is connected with the negative electrode end of a second diode D3, and the positive electrode end of the second diode D3 is grounded. The power output end (pin 2) of the switching power supply chip IC1 is respectively connected with one end of a first capacitor C1 and the positive electrode end of a third diode ZD1, the other end of the first capacitor C1 is connected with the negative electrode end of a second diode D3 and is respectively connected with the positive electrode end of a fourth diode D4 and the positive electrode end of a second electrolytic capacitor C4 through an inductor L2, the negative electrode end of the fourth diode D4 is connected with the negative electrode end of the third diode ZD1, and the positive electrode end of the second electrolytic capacitor C4 is respectively connected with the positive electrode input end of a step-down stabilizing circuit 12 and the power input ends of a first switching circuit 21 and a second switching circuit 22 so as to respectively supply power to the converted first direct current power to the step-down stabilizing circuit 12, the first switching circuit 21 and the power input ends of the second switching circuit 22 in an adaptive manner; the negative terminal of the second electrolytic capacitor C4 is connected to the step-down stabilizing circuit 12 and to the ground, and the negative terminal of the second electrolytic capacitor C4 is connected to the first switching circuit 21 through the fifth diode D7 that is turned on in the forward direction.
The step-down stabilizing circuit 12 includes a step-down chip IC3, a second resistor R3, a third electrolytic capacitor C3, and a second capacitor C7. The positive input end (pin 3) of the buck chip IC3 is connected to one end of the second resistor R3 and the positive end of the second electrolytic capacitor C4, respectively, and the other end of the second resistor R3 is connected to the ground end (pin 2) of the buck chip IC3 and grounded. The power output end (pin 1) of the buck chip IC3 is respectively connected with the positive end of the third electrolytic capacitor C3 and one end of the second capacitor C7 and the main control circuit 3 so as to provide a second direct current for the main control circuit 3; the negative electrode of the third electrolytic capacitor C3 and the other end of the second capacitor C7 are grounded, and the negative electrode of the third electrolytic capacitor C3 is connected with the input end of the defrosting heater 71 through a positive-conduction sixth diode D2.
It should be noted that, when the ambient temperature is higher than the preset temperature of the refrigeration temperature controller S1, the refrigeration temperature controller S1 is turned on, and the rectification circuit 1 is communicated with the refrigeration module 3 and the defrosting module 4 to realize the conduction of the power supply loop thereof. The switching power supply circuit 11 provides 12V first direct current for the first switching circuit 21 and the second switching circuit 22, the voltage reduction stabilizing circuit 12 provides 5V second direct current for the main control circuit 3, the output voltage stability is good, and the stable operation of relevant electronic devices of the circuit is effectively ensured. The switching power supply chip IC1 is preferably a non-isolated switching power supply chip, and realizes the co-connection of alternating current ground and direct current ground in a non-isolated power supply mode, so that a sampling circuit can directly sample voltage signals, a photoelectric isolation sampling mode with higher cost is not needed, a circuit structure is simplified, and the cost is effectively reduced. The model of the power chip IC1 is preferably KP311ALGA, but not limited thereto, and may be selected according to actual requirements. The model of the buck chip IC3 is preferably MC78L05CP, but not limited thereto, and may be selected according to actual requirements.
2. Function switching circuit 2
The function switching circuit 2 includes a first switching circuit 21 and a second switching circuit 22.
Specifically, the first switch circuit 21 includes a first relay REL2, a first switch tube Q2, a seventh diode D6, and a third resistor R4, where a first coil end of the first relay REL2 is connected to a first direct current and a negative electrode end of the seventh diode D6, a second coil end of the first relay REL2 is connected to a first end of the first switch tube Q2 and a positive electrode end of the seventh diode D6, a common terminal of the first relay REL2 is connected to a normally closed terminal of the first relay REL2 and an input end of the compressor 71, a normally closed terminal of the first relay REL2 is connected to a negative electrode end of the fifth diode D7, a positive electrode end of the fifth diode D7 is connected to a negative electrode output end of the switching power supply circuit 11, and a normally open terminal of the first relay REL2 is connected to a power line end of the external power supply module 5 through the refrigeration temperature controller S1; the control end of the first switching tube Q2 is connected with the main control circuit 3 through a third resistor R4, and the second end of the first switching tube Q2 is grounded.
The second switch circuit 22 includes a second relay REL1, a second switch tube Q1, an eighth diode D5, and a fourth resistor R2, where a first coil end of the second relay REL1 is connected to negative ends of the first direct current and the eighth diode D5, a second coil end of the second relay REL1 is connected to a first end of the second switch tube Q1 and a positive end of the eighth diode D5, a common terminal of the second relay REL1 is connected to a power supply live wire end of the external power supply module 5 through the refrigeration temperature controller S1 and to a normally closed terminal of the second relay REL1, the normally closed terminal of the second relay REL1 is a suspension end, and the normally open terminal of the second relay REL1 is connected to an input end of the defrosting heater 71 sequentially through the defrosting temperature controller S2; the control end of the second switching tube Q1 is connected with the main control circuit 3 through a fourth resistor R2, and the second end of the second switching tube Q1 is grounded.
It should be noted that, when the ambient temperature is higher than the preset temperature of the refrigeration temperature controller S1, the refrigeration temperature controller S1 is turned on, and at this time, the rectification circuit 1 and the defrosting module 7 implement to turn on the power supply circuit thereof through the refrigeration module 6, so as to supply power to the main control circuit 3 and the first switch circuit 21 and the second switch circuit 22 in an adaptive manner.
When refrigeration is carried out, the main control circuit 3 sends a control signal to control the first switching tube Q2 to be conducted, so that the coil power supply loop of the first relay REL2 is conducted, the common terminal of the first relay REL2 is connected with the normally open terminal of the first relay REL2, the input end of the compressor 71 is connected with the power supply live wire end of the external power supply module 5 through the conducted refrigeration temperature controller S1, the working power supply loop of the compressor 71 is conducted, and the compressor 71 is electrified to realize the refrigeration function. Meanwhile, the negative electrode output end of the switching power supply circuit 11 is connected with the zero line end of the external power supply module 5 through a sixth diode D2 and a defrosting heater 71 in sequence so as to form stable conduction of a power supply loop of the switching power supply circuit 11 and ensure stable operation of the switching power supply circuit 11; at this time, the voltage applied to the defrosting heater 71 is small, the heating value is negligible, and the cooling operation is not affected.
When defrosting is performed, the main control circuit 3 sends out control signals to control the first switching tube Q2 to be disconnected and the second switching tube Q1 to be conducted respectively, so that a coil power supply loop of the first relay REL2 is disconnected and a coil power supply loop of the second relay REL1 is conducted, a common terminal of the second relay REL1 is connected with a normally open terminal of the second relay REL1, the defrosting heater 71 is connected with a power supply live wire end of the external power supply module 5 through the conducted defrosting temperature controller S2 and the conducted refrigerating temperature controller S1, a working power supply loop of the defrosting heater 71 is conducted, and the defrosting function is achieved by electrifying the defrosting heater 71. Meanwhile, the negative electrode output end of the switching power supply circuit 11 can be connected with the zero line end of the external power supply module 5 through a fifth diode D7 and a compressor 71, and can also be connected with the zero line end of the external power supply module 5 through a sixth diode D2 and a defrosting heater 71 so as to form stable conduction of a power supply loop of the switching power supply circuit 11 and ensure stable operation of the switching power supply circuit 11; at this time, the voltage applied to the compressor 71 is small, and the compressor 71 does not operate. After defrosting is finished, the first relay REL2 and the second relay REL1 are correspondingly controlled to work by sending control signals through the main control circuit 3 so as to be switched back to the refrigeration work of the compressor 71 again. Through the mode, the power supply loop of the uninterrupted conduction rectifying circuit 1 can be realized to ensure the normal operation of the whole circuit, and the working power supply loop of the refrigeration module 6 or the defrosting module 7 is switched to realize refrigeration or defrosting operation, so that the mechanical power supply circuit can be fully used, and no additional independent power supply or independent power supply circuit is required.
The first switching tube Q1 and the second switching tube Q2 are preferably NPN transistors, but are not limited thereto. The defrosting heater 71 is preferably a defrosting heating wire, but is not limited thereto. The defrosting temperature controller S2 is a bimetal defrosting temperature controller, but is not limited to the bimetal defrosting temperature controller.
3. Master control circuit 3
The main control circuit 3 comprises a main control chip IC2, a sampling pin (pin 7) of the main control chip IC2 is connected with the output end of the sampling circuit 4, a first control output pin (pin 6) of the main control chip IC2 is connected with the control end of the first switch circuit 21, a second control output pin (pin 5) of the main control chip IC2 is connected with the control end of the second switch circuit 22, a power supply pin (pin 8) of the main control chip IC2 is connected with a second direct current, and a grounding pin (pin 1) of the main control chip IC2 is grounded.
When the ambient temperature is higher than the preset temperature of the refrigeration temperature controller S1, the refrigeration temperature controller S1 is turned on, the power supply input makes the rectifying circuit 1 supply power to operate, and the main control chip IC2 is powered on to control the first switch circuit 21 to drive the compressor 71 to power on so as to achieve the refrigeration effect and perform refrigeration timing. When the ambient temperature is lower than the preset temperature of the refrigeration temperature controller S1, the refrigeration temperature controller S1 is disconnected, the stored energy electrolytic capacitor in the rectifying circuit 1 supplies power for the main control chip IC2 for a short time, and the main control chip IC2 stores the current refrigeration accumulated working time into the built-in memory of the main control chip IC2 according to the low-level signal acquired by the sampling circuit 4. When the refrigeration temperature controller S1 is turned on again, the main control chip IC2 is powered on again to work and continues to perform refrigeration timing according to the last stored refrigeration accumulated working time. When the above-mentioned refrigerating operation is circulated until the refrigerating accumulated operating time reaches the preset refrigerating timing time, the main control chip IC2 controls the first switch circuit 21 and the second switch circuit 22 to switch and drive the defrosting heater 71 to operate and to perform defrosting timing; when the defrosting accumulated working time of the main control chip IC2 reaches the preset defrosting timing time, the main control chip IC2 controls the first switch circuit 21 and the second switch circuit 22 to work so as to switch and drive the refrigeration module 7 to work and perform refrigeration timing again. By executing the circulating work, the circulating switching function of the refrigerating timing work and the defrosting timing work is realized, and the actual requirements of users are met.
It should be noted that, before the cooling accumulated operating time reaches the preset cooling timing time, the temperature detected by the defrosting temperature controller S2 is already lower than the preset temperature, and at this time, the defrosting temperature controller S2 is already in a conducting state. In the defrosting working stage, the refrigeration temperature controller S1 is always in a conducting state, and when the defrosting accumulated working time of the main control chip IC2 reaches the preset defrosting timing time, the main control chip IC2 controls the function switching circuit 2 to switch and drive the refrigeration module 7 to work and perform refrigeration timing again. During the defrosting timing time, the defrosting temperature controller S2 may be automatically turned off or turned on continuously according to the temperature condition detected by itself, that is, automatically turned off in advance according to the defrosting condition to stop the operation of the defrosting heater 71 or turned on continuously to continue the operation of the defrosting heater 71, so that the defrosting effect of the defrosting heater 71 is ensured while overheating is avoided.
The main control circuit 3 further includes an external clock module X1 and a control key K1, where the external clock module X1 is connected to a first clock pin (pin 2) and a second clock pin (pin 3) of the main control chip IC2, one end of the control key K1 is connected to a signal input pin (pin 4) of the main control chip IC2, and the other end of the control key K1 is grounded. The main control chip IC2 can be manually controlled to switch the refrigerating or defrosting functions through the control key K1 so as to meet the use requirements of users.
Preferably, the external clock module X1 preferably uses a high-precision quartz crystal as a system clock of the main control chip IC2 to improve timing accuracy, but is not limited thereto.
It should be noted that, the model of the main control chip IC2 is preferably MC32F7062A0H, but is not limited thereto, and other chips with timer and timer interrupt functions may be selected according to actual situations.
4. Sampling circuit 4
The sampling circuit 4 comprises a first sampling resistor R5 and a second sampling resistor R6, one end of the first sampling resistor R5 is connected with a power supply live wire end of the external power supply module 5 through the refrigeration temperature controller S1, and the other end of the first sampling resistor R5 is connected with the main control circuit 3 through the second sampling resistor R6.
When the refrigeration temperature controller S1 is turned on, the main control circuit 3 is powered on to operate, and at this time, the main control circuit 3 can drive the compressor 71 to operate and perform refrigeration timing through the function switching circuit 2; when the refrigeration temperature controller S1 is disconnected, the sampling circuit 4 collects a low-level signal, and the main control circuit 3 stores the current refrigeration accumulated working time according to the low-level signal so as to be convenient for subsequent use.
In summary, the utility model has the characteristics of simple circuit structure, low working noise, low cost, high timing accuracy, complete dual-purpose mechanical power supply circuit, adjustable refrigeration timing time and defrosting timing time and the like, and meets the actual demands of users.
As shown in fig. 3, fig. 3 shows a schematic structural diagram of the defrosting timer of the present utility model, which comprises a housing 8 and a plurality of terminals 81 provided on the housing 8, wherein the housing 8 is provided therein with the defrosting timing control circuit described above, and the defrosting timing control circuit is connected with the terminals 81 for connection with an external device through the terminals 81. The external device comprises a refrigeration temperature controller, an external power supply module, a refrigeration module, a defrosting temperature controller, a defrosting module and the like.
The foregoing disclosure is merely illustrative of the preferred embodiments of the present utility model and is not intended to limit the scope of the claims herein, as equivalent changes may be made in the claims herein without departing from the scope of the utility model.
Claims (10)
1. The defrosting timing control circuit is characterized by comprising a rectifying circuit, a function switching circuit, a main control circuit and a sampling circuit, wherein the input end of the rectifying circuit and the sampling circuit are connected with a power live wire end of an external power supply module, and a power zero line end of the external power supply module is respectively connected with an external refrigeration module and a defrosting module;
the positive output end of the rectifying circuit is respectively connected with the main control circuit and the function switching circuit, and the sampling circuit is connected with the main control circuit and is used for collecting a power-on signal and sending the power-on signal to the main control circuit;
the function switching circuit comprises a first switching circuit and a second switching circuit, wherein the first switching circuit is respectively connected with the negative electrode output end of the rectifying circuit, the power supply live wire end and the refrigerating module and is used for switching and controlling the refrigerating module to be communicated with the negative electrode output end of the rectifying circuit or the power supply live wire end so as to conduct a power supply loop of a corresponding circuit;
the second switch circuit is respectively connected with the power supply live wire end and the defrosting module and is used for controlling the on-off state of a loop between the defrosting module and the power supply live wire end; the negative electrode output end of the rectifying circuit is connected with the power supply zero line end through the defrosting module;
the main control circuit is respectively connected with the first switch circuit and the second switch circuit, and is used for conducting the power supply loop of the rectifying circuit and switching on the working power supply loop of the refrigerating module or the defrosting module.
2. The defrosting timing control circuit of claim 1, wherein the rectifying circuit comprises a switching power supply circuit and a step-down stabilizing circuit;
the input end of the switching power supply circuit is connected with the live wire end of the power supply through an external refrigeration temperature controller, the negative output end of the switching power supply circuit is connected with the first switching circuit, the positive output end of the switching power supply circuit is respectively connected with the positive input end of the voltage reduction stabilizing circuit and the power input ends of the first switching circuit and the second switching circuit, and the switching power supply circuit is used for converting alternating current of the external power supply module into first direct current so as to respectively supply power to the voltage reduction stabilizing circuit, the first switching circuit and the second switching circuit in an adaptive mode;
the negative electrode output end of the voltage reduction stabilizing circuit is grounded and connected with the negative electrode output end of the switching power supply circuit and the defrosting module respectively, and the positive electrode output end of the voltage reduction stabilizing circuit is connected with the main control circuit and is used for performing voltage reduction conversion on the first direct current into a second direct current so as to supply power to the main control circuit in an adaptive mode.
3. The defrosting timing control circuit as claimed in claim 2, wherein the first switching circuit includes a first relay and a first switching tube, a first coil end of the first relay is connected with an anode output end of the switching power supply circuit, a second coil end of the first relay is connected with a first end of the first switching tube, a normally closed terminal of the first relay is respectively connected with a cathode output end of the switching power supply circuit and a common terminal of the first relay, the common terminal of the first relay is connected with an input end of the refrigerating module, and a normally open terminal of the first relay is connected with the live wire end through the refrigerating temperature controller;
the control end of the first switching tube is connected with the main control circuit, and the second end of the first switching tube is grounded.
4. The defrosting timing control circuit as claimed in claim 2, wherein the second switching circuit includes a second relay and a second switching tube, a first coil end of the second relay is connected to an anode output end of the switching power supply circuit, a second coil end of the second relay is connected to a first end of the second switching tube, a common terminal of the second relay is connected to the power supply live wire end through the cooling temperature controller and to a normally closed terminal of the second relay, and a normally open terminal of the second relay is connected to an input end of the defrosting module through an external defrosting temperature controller;
the control end of the second switching tube is connected with the main control circuit, and the second end of the second switching tube is grounded.
5. The defrosting timing control circuit as claimed in claim 2, wherein the sampling circuit comprises a first sampling resistor and a second sampling resistor, one end of the first sampling resistor is connected with the live wire end of the power supply through the refrigeration temperature controller, and the other end of the first sampling resistor is connected with the main control circuit through the second sampling resistor.
6. The defrosting timing control circuit of claim 2, wherein the master control circuit comprises a master control chip, a sampling pin of the master control chip is connected with an output end of the sampling circuit, a first control output pin of the master control chip is connected with a control end of the first switch circuit, a second control output pin of the master control chip is connected with a control end of the second switch circuit, a power supply pin of the master control chip is connected with an anode output end of the step-down stabilizing circuit, and a ground pin of the master control chip is grounded.
7. The defrosting timing control circuit of claim 6, wherein the master control circuit further comprises an external clock module and a control key, the external clock module is respectively connected with the first clock pin and the second clock pin of the master control chip, one end of the control key is connected with the signal input pin of the master control chip, and the other end of the control key is grounded.
8. The defrosting timing control circuit of any one of claims 1 to 4, wherein the refrigeration module comprises a compressor and the defrosting module comprises a defrosting heater.
9. The defrosting timing control circuit as claimed in claim 2, wherein a first diode is provided between a negative output terminal of the switching power supply circuit and the first switching circuit, the negative output terminal of the switching power supply circuit is connected with a positive terminal of the first diode, and the negative terminal of the first diode is connected with the first switching circuit;
a second diode is arranged between the negative electrode output end of the voltage reduction stabilizing circuit and the defrosting module, the negative electrode output end of the voltage reduction stabilizing circuit is connected with the positive electrode end of the second diode, and the negative electrode end of the second diode is connected with the defrosting module.
10. A defrosting timer comprising a housing and a plurality of terminals provided on the housing, wherein a defrosting timing control circuit as claimed in any one of claims 1 to 9 is provided in the housing, and the defrosting timing control circuit is connected to the terminals for connection to an external device through the terminals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321236750.XU CN219776086U (en) | 2023-05-19 | 2023-05-19 | Defrosting timing control circuit and defrosting timer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321236750.XU CN219776086U (en) | 2023-05-19 | 2023-05-19 | Defrosting timing control circuit and defrosting timer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219776086U true CN219776086U (en) | 2023-09-29 |
Family
ID=88130963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321236750.XU Active CN219776086U (en) | 2023-05-19 | 2023-05-19 | Defrosting timing control circuit and defrosting timer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219776086U (en) |
-
2023
- 2023-05-19 CN CN202321236750.XU patent/CN219776086U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110323736A (en) | Power supply switch circuit and electronic equipment | |
| CN107449034A (en) | Indoor set electric-controlled plate and air conditioner | |
| US20230332799A1 (en) | Control circuit for air conditioner outdoor unit, electric control component and air conditioner | |
| CN214477203U (en) | Relay control circuit and electrical equipment | |
| CN108488948B (en) | Air conditioner, air conditioner control system and outdoor unit switch circuit | |
| CN214799296U (en) | Intelligent power module and frequency conversion equipment | |
| CN219776086U (en) | Defrosting timing control circuit and defrosting timer | |
| CN100363957C (en) | Method for realizing zero power consumption standby of household electric appliance | |
| CN104122803A (en) | Solar-energy standby power supplying device | |
| CN201397454Y (en) | Intermittence-type power-supply micro-power-consumption standby control circuit | |
| CN211720263U (en) | Intelligent switch, wireless control device and power supply control system | |
| CN110539611B (en) | Vehicle-mounted outdoor unit control circuit and vehicle-mounted air conditioner | |
| CN204719447U (en) | The current ring communication of air conditioner and off-premises station thereof and power-supplying circuit | |
| CN100377470C (en) | Method for realiznig zero power consumption standby of household appliance power supply by super capacity | |
| CN110912496B (en) | Control method and device for energy storage motor of circuit breaker | |
| CN220171431U (en) | PDU energy-saving control device | |
| JP2000217161A (en) | Standby power supply device for remote controller | |
| CN105759684B (en) | It is a kind of to prevent opening infrared induction intelligent switch certainly by monolithic processor controlled have a power failure | |
| CN215956106U (en) | Power supply system for weak current module, single-live-wire switch and intelligent switch | |
| CN207691716U (en) | A kind of frequency-changeable compressor control system for frequency conversion refrigerator | |
| CN203910013U (en) | Electric appliance remote control starting device, television, air conditioner and power socket | |
| CN216357392U (en) | Output current control circuit and system | |
| CN220440418U (en) | Automatic transfer switch circuit and electronic equipment thereof | |
| CN2574204Y (en) | Intelligent wireless remote-controlled switchgear | |
| CN210724727U (en) | Single-live-wire electronic switch circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |