Inverter compressor control system and refrigeration equipment

Abstract

The utility model discloses a variable-frequency compressor control system and refrigeration equipment, the variable-frequency compressor control system comprises a variable-frequency controller, a first electric control switch, a first control unit and a second control unit, the variable-frequency controller is used for being connected with a variable-frequency compressor, and the variable-frequency controller comprises a power port; the first electric control switch comprises a first switch part and a first controlled part, and the first switch part is connected between the power supply port and a power supply; the first control unit comprises a first power supply end, a second power supply end, a voltage output end, a first control end and a switching circuit, the voltage output end is connected with the first controlled part, and the switching circuit is communicated with the first power supply end and the voltage output end in a first state and is communicated with the second power supply end and the voltage output end in a second state; the first control end is used for controlling the state switching of the switching circuit; and the second control unit is connected to the first controlled part and is used for controlling the on-off of the first controlled part so as to control the on-off of the first switch part. Therefore, the energy consumption of the variable frequency controller can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household appliances, and in particular to a variable frequency compressor control system and a refrigeration device. BACKGROUND

[0002] As one of the indispensable appliances in the family, the energy consumption problem of refrigeration equipment such as a refrigerator cannot be ignored. Low-power consumption technology not only reduces energy consumption and household electricity expenditure, but also has a positive driving effect on environmental protection.

[0003] In related technologies, the variable frequency compressor of the refrigerator is always powered, and only the start and stop of the variable frequency compressor are controlled by the main control system outputting a control signal to the variable frequency controller. When the variable frequency compressor is stopped, the variable frequency controller has standby power consumption, causing energy waste. SUMMARY

[0004] The present application provides a variable frequency compressor control system and a refrigeration device to solve at least some problems in related technologies.

[0005] In one aspect, the present application provides a variable frequency compressor control system, comprising:

[0006] a variable frequency controller, the variable frequency controller being configured to be connected to the variable frequency compressor, the variable frequency controller comprising a power port;

[0007] a first electrically controlled switch, comprising a first switch part and a first controlled part, the first switch part being connected between the power port and a power supply and configured to control the on-off between the power port and the power supply;

[0008] a first control unit, comprising a first power terminal, a second power terminal, a voltage output terminal, a first control terminal and a switching circuit, the voltage output terminal being connected to the first controlled part, the switching circuit being connected to the first power terminal, the second power terminal, the voltage output terminal and the first control terminal, the switching circuit being configured to connect the first power terminal and the voltage output terminal in a first state to provide the voltage of the first power terminal to the voltage output terminal, and connect the second power terminal and the voltage output terminal in a second state to provide the voltage of the second power terminal to the voltage output terminal, the first control terminal being configured to control the state switching of the switching circuit; and

[0009] a second control unit, connected to the first controlled part and configured to control the on-off of the first controlled part to control the on-off of the first switch part.

[0010] Optionally, the switching circuit comprises a first switch and a first anti-reverse diode, the first switch is connected to the first control terminal, the first switch is turned on or turned off according to the signal of the first control terminal, the first switch is connected between the first power terminal and the voltage output terminal, and the first switch is turned on to connect the first power terminal and the voltage output terminal; the second power terminal is connected between the voltage output terminal and the first switch, and the first anti-reverse diode is connected between the second power terminal and the voltage output terminal to connect the second power terminal and the voltage output terminal when the first switch is turned off.

[0011] Optionally, the switching circuit further comprises a voltage dividing circuit and a second switch, the second switch is connected to the first control terminal and is connected in series with the voltage dividing circuit between the first power terminal and the ground terminal, the voltage dividing circuit has a voltage dividing node, and the first switch is connected to the voltage dividing node; the first control terminal is used to control the turn-on and turn-off of the second switch to control the turn-on and turn-off of the first switch through the voltage of the voltage dividing node.

[0012] Optionally, the second control unit comprises a second control terminal, a third switch and a second anti-reverse diode, the third switch is connected to the second control terminal and is connected to the first controlled part, the third switch is turned on or turned off according to the signal of the second control terminal to control the on-off of the first controlled part, and the second anti-reverse diode is connected between the voltage output terminal and the third switch.

[0013] Optionally, the variable frequency compressor control system further comprises a current limiting resistor connected in series with the first switch part.

[0014] Optionally, the variable frequency compressor control system further comprises:

[0015] a second electrically controlled switch, the second electrically controlled switch comprises a second switch part and a second controlled part, and the second switch part is connected in parallel with the current limiting resistor;

[0016] a third control unit connected to the second controlled part and used to control the on-off of the second controlled part to control the on-off of the second switch part.

[0017] Optionally, the third control unit comprises a third control terminal, a fourth switch and a third anti-reverse diode, the fourth switch is connected to the third control terminal and is connected between the ground terminal and the voltage output terminal, the third terminal is connected to the voltage output terminal, the fourth switch is turned on or turned off according to the signal of the third control terminal to control the on-off between the second controlled part and the ground terminal, and the third anti-reverse diode is connected between the voltage output terminal and the fourth switch.

[0018] Optionally, the variable frequency controller further comprises a rotating speed signal receiving end, and the variable frequency compressor control system further comprises a rotating speed signal input end, the rotating speed signal receiving end is connected with the rotating speed signal input end, and is configured to receive a rotating speed control pulse signal sent by the rotating speed signal input end, and the variable frequency controller is configured to control the rotating speed of the variable frequency compressor according to the frequency of the rotating speed control pulse signal.

[0019] Optionally, the variable frequency compressor control system further comprises a pulse frequency transmission circuit, the pulse frequency transmission circuit is connected between the rotating speed signal receiving end and the rotating speed signal input end, the pulse frequency transmission circuit comprises a fifth switch, the fifth switch is connected with the rotating speed signal input end and connected between the second power supply end and the rotating speed signal receiving end, and the rotating speed signal receiving end is connected with a ground end; the fifth switch is turned on or turned off according to the potential of the rotating speed signal input end, so as to control the potential of the rotating speed signal receiving end.

[0020] Another aspect of the present application provides a refrigeration equipment comprising a variable frequency compressor and a variable frequency compressor control system.

[0021] The variable frequency compressor control system and the refrigeration equipment provided by the present application can control the power supply port and the power supply to be disconnected by controlling the power supply of the first controlled part through the second control unit when the variable frequency compressor is stopped, and can control the first controlled part to be supplied with a larger voltage through the first control unit when the first controlled part is started, and can control the first controlled part to be supplied with a smaller voltage through the first control unit when the first controlled part is maintained in the conduction stage, so that the energy consumption can be reduced and the energy can be saved.

[0022] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0024] Figure 1 A principle block diagram of a variable frequency compressor control system shown in an embodiment of the present application;

[0025] Figure 2 A principle block diagram of a variable frequency compressor control system shown in an embodiment of the present application; Figure 1a principle block diagram of the first control unit shown in the figure;

[0026] Figure 3 a principle block diagram of the first control unit shown in the figure; Figure 2 a principle block diagram of the first control unit shown in the figure;

[0027] Figure 4 a principle block diagram of the first control unit shown in the figure; Figure 1 a principle block diagram of the first control unit shown in the figure;

[0028] Figure 5 a principle block diagram of the variable frequency compressor control system shown in another embodiment of the present application;

[0029] Figure 6 a principle block diagram of the variable frequency compressor control system shown in another embodiment of the present application;

[0030] Figure 7 a principle block diagram of the variable frequency compressor control system shown in another embodiment of the present application;

[0031] Figure 8 a principle block diagram of the variable frequency compressor control system shown in another embodiment of the present application.

[0032] The refrigeration equipment 100, the variable frequency compressor 110, the variable frequency compressor control system 1, the variable frequency controller 10, the power port 120, the first electrically controlled switch 20, the first switch part 21, the first controlled part 22, the power supply 130, the first control unit 30, the first power supply end 31, the second power supply end 32, the voltage output end 33, the first control end 34, the switching circuit 35, the first switch 36, the first anti-reverse diode 37, the voltage dividing circuit 38, the voltage dividing node 381, the second switch 39, the second control unit 40, the second control end 41, the third switch 42, the second anti-reverse diode 43, the current limiting resistor 50, the second electrically controlled switch 51, the second switch part 511, the second controlled part 512, the third control unit 60, the third control end 61, the fourth switch 62, the third anti-reverse diode 63, the rotational speed signal receiving end 72, the rotational speed signal input end 71, the pulse frequency transfer circuit 70, the fifth switch 73. DETAILED DESCRIPTION

[0033] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, the same numbers are used to indicate the same or similar elements, unless otherwise represented. The embodiments described in the following exemplary embodiments do not represent all the implementations consistent with the present application. Instead, they only represent examples of devices and methods consistent with some aspects of the present application, as detailed in the appended claims.

[0034] The application provides a variable frequency compressor control system 1 and a refrigeration equipment 100. The variable frequency compressor control system 1 and the refrigeration equipment 100 of the application are described in detail below in combination with the drawings. The features in the following embodiments and implementation manners can be combined with each other without conflict.

[0035] Figure 1 The principle block diagram of the variable frequency compressor control system 1 shown in an embodiment of the application.

[0036] In Figure 1 In the embodiment shown, the refrigeration equipment 100 comprises the variable frequency compressor control system 1 and the variable frequency compressor 110, the variable frequency compressor control system 1 is connected with the variable frequency compressor 110 and used for controlling the variable frequency compressor 110. The variable frequency compressor control system 1 comprises a variable frequency controller 10, a first electrically controlled switch 20, a first control unit 30 and a second control unit 40.

[0037] The variable frequency controller 10 is used for connecting the variable frequency compressor 110 and controlling the start-stop and rotating speed of the variable frequency compressor 110. The variable frequency controller 10 comprises a power supply port 120, in some embodiments, the power supply port 120 comprises a positive port and a negative port, the positive port can be used for connecting the live wire of the mains, and the negative port can be used for connecting the neutral wire of the mains.

[0038] The first electrically controlled switch 20 comprises a first switch part 21 and a first controlled part 22, the first switch part 21 is connected between the power supply port 120 and a power supply 130 and used for controlling the on-off between the power supply port 120 and the power supply 130. In the embodiment, the first electrically controlled switch 20 is a first relay, the first switch part 21 is the contact part of the first relay, and the first controlled part 22 is the coil part of the first relay. The on-off of the first controlled part 22 can control the on-off of the first switch part 21, and the on-off of the first switch part 21 controls the on-off between the power supply port 120 and the power supply 130. The power supply 130 can be the mains or other power supply 130 components for supplying power to the variable frequency controller 10.

[0039] The second control unit 40 is connected with the first controlled part 22 and used for controlling the on-off power of the first controlled part 22 to control the on-off of the first switch part 21. In this way, the on-off power of the first controlled part 22 can be controlled by the second control unit 40. In this way, when the variable frequency compressor 110 is stopped, the power-off of the first controlled part 22 can be controlled by the second control unit 40, and then the power supply port 120 and the power supply 130 are disconnected, which can avoid the standby energy consumption of the variable frequency controller 10.

[0040] The first control unit 30 comprises a first power terminal 31, a second power terminal 32, a voltage output terminal 33, a first control terminal 34 and a switching circuit 35. The voltage output terminal 33 is connected to the first controlled part 22. The switching circuit 35 is connected to the first power terminal 31, the second power terminal 32, the voltage output terminal 33 and the first control terminal 34. The switching circuit 35 is in a first state to connect the first power terminal 31 and the voltage output terminal 33, so that the voltage of the first power terminal 31 is provided to the voltage output terminal 33. The switching circuit 35 is in a second state to connect the second power terminal 32 and the voltage output terminal 33, so that the voltage of the second power terminal 32 is provided to the voltage output terminal 33. The first control terminal 34 is used to control the state switching of the switching circuit 35. In this way, the voltage provided to the first controlled part 22 can be controlled by the first control unit 30.

[0041] In the embodiment, the voltage of the first power terminal 31 is different from the voltage of the second power terminal 32, and the voltage of the first power terminal 31 is greater than the voltage of the second power terminal 32. In some embodiments, the voltage of the first power terminal 31 is 12V, and the voltage of the second power terminal 32 is 5V. The voltage of the first power terminal 31 is not less than the voltage required for the first relay to start, and the voltage of the second power terminal 32 is less than the voltage required for the first relay to start, but not less than the voltage required for the first relay to work after starting.

[0042] In this way, when the first controlled part 22 starts, the first control unit 30 can control a larger voltage, i.e. the voltage of the first power terminal 31 is provided to the first controlled part 22 to start the first controlled part 22 and control the first switch part 21 to be conductive. In the maintaining stage of the first controlled part 22, the first control unit 30 controls a smaller voltage, i.e. the voltage of the second power terminal 32 is provided to the first controlled part 22 to maintain the first switch part 21 to be conductive. The energy consumption can be further reduced to save energy.

[0043] Please refer to Figure 2 , Figure 2 for Figure 1 the principle diagram of the first control unit 30. As shown in Figure 2 , the switching circuit 35 comprises a first switch 36 and a first anti-reverse diode 37. The first switch 36 is connected to the first control terminal 34. The first switch 36 is conductive or non-conductive according to the signal of the first control terminal 34. When the first switch 36 is conductive, the switching circuit 35 is in the first state. When the first switch 36 is non-conductive, the switching circuit 35 is in the second state.

[0044] The first switch 36 is connected between the first power supply end 31 and the voltage output end 33. When the first switch 36 is turned on, the first power supply end 31 and the voltage output end 33 are connected. The second power supply end 32 is connected between the voltage output end 33 and the first switch 36. When the first switch 36 is turned off, the second power supply end 32 and the voltage output end 33 are connected. The first anti-reverse diode 37 is connected between the second power supply end 32 and the voltage output end 33. In this way, when the first switch 36 is turned on, the first power supply end 31 is prevented from supplying power to the second power supply end 32, and only the first power supply end 31 supplies power to the voltage output end 33. When the first switch 36 is turned off, the second power supply end 32 is not limited to supply power to the voltage output end 33.

[0045] Please refer to Figure 3 , Figure 3 for Figure 2 the circuit diagram of the first control unit 30. As shown in Figure 3 , the switching circuit 35 further includes a voltage dividing circuit 38 and a second switch 39. The second switch 39 is connected to the first control end 34 and is connected in series with the voltage dividing circuit 38 between the first power supply end 31 and the ground end. The voltage dividing circuit 38 has a voltage dividing node 381, and the first switch 36 is connected to the voltage dividing node 381. The first control end 34 is used to control the turn-on and turn-off of the second switch 39, so as to control the turn-on and turn-off of the first switch 36 through the voltage of the voltage dividing node 381.

[0046] In the embodiment shown in Figure 3 , the second switch 39 is a high-level turn-on transistor. The base of the second switch 39 is connected to the first control end 34, and the emitter of the second switch 39 is connected to the ground end. When the potential of the first control end 34 is high, the second switch 39 is turned on. When the potential of the first control end 34 is low, the second switch 39 is turned off. The collector of the second switch 39 is connected to the voltage dividing circuit 38. When the second switch 39 is turned on, a path is formed between the first power supply end 31, the voltage dividing circuit 38, the second switch 39 and the ground end, and there is a voltage difference between the voltage dividing node 381 and the first power supply end 31.

[0047] The first switch 36 is a pmos transistor. The gate of the first switch 36 is connected to the voltage dividing node 381. The source of the first switch 36 is connected to the first power supply end 31. The drain of the first switch 36 is connected to the voltage output end 33. The voltage difference between the voltage dividing node 381 and the first power supply end 31 makes the first switch 36 turned on. When the second switch 39 is turned off, there is no voltage difference between the voltage dividing node 381 and the first power supply end 31, and the first switch 36 is also turned off. In this way, the turn-on and turn-off of the first switch 36 can be controlled by controlling the potential of the first control end 34 to control the turn-on and turn-off of the second switch 39.

[0048] Please refer to Figure 4 , Figure 4 forFigure 1 a circuit diagram of the second control unit 40. As shown in the figure, Figure 4 The second control unit 40 includes a second control terminal 41, a third switch 42 connected to the second control terminal 41 and the first controlled part 22, and a second anti-reverse diode 43 connected between the voltage output terminal 33 and the third switch 42.

[0049] In the embodiment shown in the figure, Figure 4 In the embodiment shown in the figure, the third switch 42 is a high-level conducting transistor, the base of the third switch 42 is connected to the second control terminal 41, and the emitter of the third switch 42 is connected to the ground terminal. When the potential of the second control terminal 41 is high, the third switch 42 is turned on, and when the potential of the second control terminal 41 is low, the third switch 42 is turned off. When the third switch 42 is turned on, a path is formed between the voltage output terminal 33, the first controlled part 22, the third switch 42, and the ground terminal, the first controlled part 22 is powered, and the first switch part 21 is controlled to be turned on, and the power supply 130 supplies power to the frequency conversion controller 10. When the third switch 42 is turned off, no current flows through the first controlled part 22, and the first switch part 21 is controlled to be turned off, and the power supply 130 and the frequency conversion controller 10 are disconnected. In this way, the on-off of the first switch part 21 can be controlled by controlling the potential of the second control terminal 41, and the control method is simple and the control effect is good.

[0050] Please refer to Figure 5 , Figure 5 a principle block diagram of the frequency conversion compressor control system 1 according to another embodiment of the present application. In the embodiment shown in the figure, Figure 5 In the embodiment shown in the figure, the frequency conversion compressor control system 1 further includes a current limiting resistor 50 connected in series with the first switch part 21. Because there is an electrolytic capacitor at the power supply port 120 of the frequency conversion controller 10, the main function of the electrolytic capacitor is to filter and stabilize voltage. When the voltage at the power supply port 120 of the frequency conversion controller 10 changes, it plays a role in smoothing the direct current output, protecting the circuit, and bearing the surge voltage. When the frequency conversion controller 10 is powered on, the power supply 130 will charge the electrolytic capacitor, and at this time there will be a large impact current. By setting the current limiting resistor 50, the impact current can be reduced.

[0051] In the embodiment shown in the figure, Figure 5 The frequency conversion compressor control system 1 further includes a second electrically controlled switch 51 and a third control unit 60.

[0052] The second electronically controlled switch 51 includes a second switching part 511 and a second controlled part 512. The second switching part 511 is connected in parallel with the current-limiting resistor 50. The second electronically controlled switch 51 is a second relay. The second switching part 511 is the contact part of the second relay, and the second controlled part 512 is the coil part of the second relay. The on / off state of the second controlled part 512 can control the on / off state of the second switching part 511. When the second switching part 511 is on, the current-limiting circuit is short-circuited, thereby reducing the energy consumption of the current-limiting resistor 50 when the frequency converter 10 is working. The third control unit 60 is connected to the second controlled part 512 and is used to control the on / off state of the second controlled part 512 to control the on / off state of the second switching part 511.

[0053] Please refer to Figure 6 , Figure 6 A circuit diagram of a variable frequency compressor control system 1 provided for one embodiment of this application. Figure 6 In the illustrated embodiment, the third control unit 60 includes a third control terminal 61, a fourth switch 62, and a third reverse protection diode 63. The fourth switch 62 is connected to the third control terminal 61 and is connected between the ground terminal and the voltage output terminal 33. The third control terminal 62 is connected to the voltage output terminal 33. The fourth switch 62 is turned on or off according to the signal from the third control terminal 61 to control the connection or disconnection between the second controlled part 512 and the ground terminal. The third reverse protection diode 63 is connected between the voltage output terminal 33 and the fourth switch 62.

[0054] exist Figure 6 In the illustrated embodiment, the fourth switch 62 is a high-level conducting transistor. The base of the fourth switch 62 is connected to the third control terminal 61, and the emitter of the fourth switch 62 is connected to the ground terminal. When the potential of the third control terminal 61 is high, the fourth switch 62 is turned on; when the potential of the third control terminal 61 is low, the fourth switch 62 is turned off. When the fourth switch 62 is turned on, a path is formed between the voltage output terminal 33, the second controlled part 512, the fourth switch 62, and the ground terminal. The second controlled part 512 is energized, thereby controlling the second switch part 511 to conduct, and the current-limiting resistor 50 is short-circuited. When the fourth switch 62 is turned off, no current flows through the second controlled part 512, the second controlled part 512 is disconnected, and the current-limiting resistor 50 is not short-circuited. Thus, the on / off state of the second switch part 511 can be controlled by controlling the potential of the third control terminal 61, thereby controlling whether the current-limiting resistor 50 is short-circuited. The control method is simple and the control effect is good.

[0055] Please continue to refer to this. Figure 6 ,exist Figure 6In the embodiment shown, the variable frequency controller 10 further comprises a rotating speed signal receiving end 72, and the variable frequency compressor control system 1 further comprises a rotating speed signal input end 71, the rotating speed signal receiving end 72 is connected with the rotating speed signal input end 71, and is configured to receive a rotating speed control pulse signal sent by the rotating speed signal input end 71, and the variable frequency controller 10 is configured to control the rotating speed of the variable frequency compressor 110 according to the frequency of the rotating speed control pulse signal. The rotating speed of the variable frequency compressor 110 corresponds to the frequency of the rotating speed control pulse signal in a one-to-one manner.

[0056] In Figure 6 In the embodiment shown, the variable frequency compressor control system 1 further comprises a pulse frequency transfer circuit 70, the pulse frequency transfer circuit 70 is connected between the rotating speed signal receiving end 72 and the rotating speed signal input end 71, and the pulse frequency transfer circuit 70 comprises a fifth switch 73, the fifth switch 73 is connected with the rotating speed signal input end 71 and connected between the second power supply end 32 and the rotating speed signal receiving end 72, and the rotating speed signal receiving end 72 is connected with a ground end; the fifth switch 73 is turned on or turned off according to the potential of the rotating speed signal input end 71, so as to control the potential of the rotating speed signal receiving end 72.

[0057] The fifth switch 73 is a low-level conducting transistor, the base of the fifth switch 73 is connected with the rotating speed signal input end 71, the emitter of the fifth switch 73 is connected with the voltage output end 33, and the collector of the fifth switch 73 is connected with the ground end. When the potential of the rotating speed signal input end 71 is low, the fifth switch 73 is turned on, and when the potential of the rotating speed signal input end 71 is high, the fifth switch 73 is turned off. When the fifth switch 73 is turned on, the rotating speed signal receiving end 72 has a high potential, and when the fifth switch 73 is turned off, the rotating speed signal receiving end 72 has a low potential. The potential of the rotating speed signal receiving end 72 changes with the potential of the rotating speed signal input end 71, and the frequency is the same. In this way, the frequency of the rotating speed signal input end 71 can be transferred to the rotating speed signal receiving end 72 of the variable frequency controller 10 through the pulse frequency transfer circuit 70, and then the variable frequency controller 10 controls the rotating speed of the variable frequency compressor 110 according to the frequency.

[0058] Please refer to Figure 7 and Figure 8 , Figure 7 the control timing diagram of the variable frequency compressor 110 of the variable frequency compressor control system 1 provided in the embodiment of the present application when the variable frequency compressor 110 works normally; Figure 8 the control timing diagram of the variable frequency compressor 110 of the variable frequency compressor control system 1 provided in the embodiment of the present application when the variable frequency compressor 110 works abnormally.

[0059] As Figure 7 shown, when the variable frequency compressor 110 is controlled to work, first, the MCU sends a high level to the first control end 34, at this time, the first switch 36 and the second switch 39 are turned on, so that the voltage of the voltage output end 33 becomes +12V.

[0060] Two seconds later, the MCU sends a high level to the second control terminal 41, turning on the first switch 21 and powering the power supply 130 to supply power to the frequency converter 10.

[0061] Two seconds later, the MCU sends a high level to the third control terminal 61, which short-circuits the current-limiting resistor 50 to prevent it from consuming power.

[0062] Two seconds later, the MCU sends a low level to the first control terminal 34. At this time, the first switch 36 and the second switch 39 will be disconnected, and the first anti-reverse diode 37 will be turned on, making the voltage of the voltage output terminal 33 become +5V. At the same time, the MCU sends a speed control pulse signal to the frequency converter 10 through the speed signal input terminal 71 to control the operation of the frequency converter compressor 110.

[0063] When the press stops:

[0064] The MCU first sends a low level to the third control terminal 61 and the speed signal input terminal 71, causing the frequency converter 10 to stop working and ensuring that the current limiting resistor 50 is not short-circuited. After 40 seconds, the MCU sends a low level to the second control terminal 41, causing the first switch 21 to open, thereby disconnecting the power supply 130 from the frequency converter 10, and the power supply 130 no longer supplies power to the frequency converter 10.

[0065] like Figure 8 As shown, Figure 8 The control timing diagram of the variable frequency compressor 110 of the variable frequency compressor control system 1 provided in the embodiment of this application when the variable frequency compressor 110 is working abnormally. Figure 8 The control timing shown Figure 7 The control timing shown is basically the same. The difference lies in... Figure 8 In the process, after controlling the variable frequency compressor 110 to work, if it is detected that the variable frequency compressor 110 is malfunctioning or the power supply of the variable frequency controller 10 is abnormal, the variable frequency controller 10 is first controlled to stop, and then the variable frequency controller 10 is controlled to work again.

[0066] The temperature of the defrost sensor can be used to determine whether the inverter compressor 110 is working properly. Specifically, if the temperature of the defrost sensor keeps rising, it is considered that the inverter compressor 110 is working abnormally and is not cooling the refrigeration equipment 100.

[0067] Whether the power supply of the variable frequency controller 10 is abnormal can be determined by detecting whether the variable frequency controller 10 has the sinusoidal alternating current. In some embodiments, the power port 120 includes a positive port and a negative port, and a power supply detection circuit is connected between the positive port and the negative port. The power supply detection circuit can output a square wave signal when the variable frequency controller 10 has the sinusoidal alternating current, and does not output the square wave signal when the power supply of the variable frequency controller 10 is abnormal. In this way, whether the power supply of the variable frequency controller 10 is abnormal can be determined by detecting whether the power supply detection circuit outputs the square wave signal. The power supply detection circuit is a known circuit.

[0068] Another aspect of the present application provides a refrigeration device 100 comprising a variable frequency compressor 110 and the variable frequency compressor control system 1. The above definitions regarding the variable frequency compressor control system 1 also apply to the refrigeration device 100 comprising the variable frequency compressor control system 1, which will not be repeated here.

[0069] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0070] It is to be understood that the application is not limited to the precise details of construction and the above-described and shown in the drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is limited only by the claims that follow.

Claims

1. A variable frequency compressor control system, characterized in that, include: A frequency converter, the frequency converter being connected to the frequency converter compressor, the frequency converter including a power port; A first electronically controlled switch includes a first switching part and a first controlled part. The first switching part is connected between the power port and the power source and is used to control the connection and disconnection between the power port and the power source. The first control unit includes a first power supply terminal, a second power supply terminal, a voltage output terminal, a first control terminal, and a switching circuit. The voltage output terminal is connected to the first controlled part. The switching circuit is connected to the first power supply terminal, the second power supply terminal, the voltage output terminal, and the first control terminal. In a first state, the switching circuit connects the first power supply terminal and the voltage output terminal, so that the voltage of the first power supply terminal is provided to the voltage output terminal. In a second state, the switching circuit connects the second power supply terminal and the voltage output terminal, so that the voltage of the second power supply terminal is provided to the voltage output terminal. The first control terminal is used to control the state switching of the switching circuit. and The second control unit is connected to the first controlled part and is used to control the power supply of the first controlled part in order to control the power supply of the first switch part.

2. The variable frequency compressor control system according to claim 1, characterized in that, The switching circuit includes a first switch and a first reverse protection diode. The first switch is connected to the first control terminal. The first switch is turned on or off according to the signal from the first control terminal. The first switch is connected between the first power supply terminal and the voltage output terminal. When the first switch is on, the first power supply terminal and the voltage output terminal are connected. The second power supply terminal is connected between the voltage output terminal and the first switch. The first reverse protection diode is connected between the second power supply terminal and the voltage output terminal. When the first switch is off, the second power supply terminal and the voltage output terminal are connected.

3. The variable frequency compressor control system according to claim 2, characterized in that, The switching circuit further includes a voltage divider circuit and a second switch. The second switch is connected to the first control terminal and is connected in series with the voltage divider circuit between the first power supply terminal and the ground terminal. The voltage divider circuit has a voltage divider node. The first switch is connected to the voltage divider node. The first control terminal is used to control the conduction and cutoff of the second switch so as to control the conduction and cutoff of the first switch through the voltage of the voltage divider node.

4. The variable frequency compressor control system according to claim 2, characterized in that, The second control unit includes a second control terminal, a third switch, and a second anti-reverse diode. The third switch is connected to the second control terminal and to the first controlled part. The third switch is turned on or off according to the signal from the second control terminal to control the power supply of the first controlled part. The second anti-reverse diode is connected between the voltage output terminal and the third switch.

5. The variable frequency compressor control system according to claim 1, characterized in that, The variable frequency compressor control system also includes a current-limiting resistor connected in series with the first switch section.

6. The variable frequency compressor control system according to claim 5, characterized in that, The variable frequency compressor control system also includes: The second electronically controlled switch includes a second switching part and a second controlled part, wherein the second switching part is connected in parallel with the current limiting resistor; The third control unit is connected to the second controlled part and is used to control the power supply of the second controlled part in order to control the power supply of the second switch.

7. The variable frequency compressor control system according to claim 6, characterized in that, The third control unit includes a third control terminal, a fourth switch, and a third reverse protection diode. The fourth switch is connected to the third control terminal and is connected between the ground terminal and the voltage output terminal. The third control terminal is connected to the voltage output terminal. The fourth switch is turned on or off according to the signal from the third control terminal to control the connection between the second controlled part and the ground terminal. The third reverse protection diode is connected between the voltage output terminal and the fourth switch.

8. The variable frequency compressor control system according to claim 1, characterized in that, The frequency converter controller further includes a speed signal receiving terminal, and the frequency converter compressor control system further includes a speed signal input terminal. The speed signal receiving terminal is connected to the speed signal input terminal and is used to receive the speed control pulse signal sent by the speed signal input terminal. The frequency converter controller is used to control the speed of the frequency converter compressor according to the frequency of the speed control pulse signal.

9. The variable frequency compressor control system according to claim 8, characterized in that, The variable frequency compressor control system further includes a pulse frequency transmission circuit, which is connected between the speed signal receiving terminal and the speed signal input terminal. The pulse frequency transmission circuit includes a fifth switch, which is connected to the speed signal input terminal and between the second power supply terminal and the speed signal receiving terminal. The speed signal receiving terminal is connected to the ground terminal. The fifth switch is turned on or off according to the potential of the speed signal input terminal to control the potential of the speed signal receiving terminal.

10. A refrigeration device, characterized in that, Includes a variable frequency compressor and a variable frequency compressor control system as described in any one of claims 1 to 9.

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