Control device and method of magnetic levitation compressor controller and magnetic levitation compressor

Abstract

The present invention discloses a control device for a magnetic levitation compressor controller, a magnetic levitation compressor, and a control method for the magnetic levitation compressor controller. The device comprises: when the ambient temperature of the magnetic levitation compressor controller falls below a set temperature threshold, disconnecting a switch unit from the control unit and connecting the switch unit to the duty cycle unit; when the duty cycle unit is connected to an IPM unit via the switch unit, generating a duty cycle signal based on the ambient temperature of the magnetic levitation compressor controller; and operating under the control of the duty cycle signal, the IPM unit generates heat during operation, which is dissipated by a heat sink to heat the space within the magnetic levitation compressor controller. This solution ensures the operational reliability of the magnetic levitation compressor by enabling the magnetic levitation compressor controller to automatically activate part of its own circuitry to heat the ambient temperature under extreme ambient temperatures.

Description

Technical Field

[0001] The present invention belongs to the field of magnetic levitation technology, and specifically relates to a control device of a magnetic levitation compressor controller, a magnetic levitation compressor and a control method of the magnetic levitation compressor controller, and more particularly to a self-heating device of a magnetic levitation bearing controller, a magnetic levitation compressor having a self-heating device of the magnetic levitation bearing controller, and a control method of the self-heating device of the magnetic levitation bearing controller of the magnetic levitation compressor. Background Art

[0002] With the development of magnetic levitation technology, market demand for magnetic levitation compressors is increasing. An increasing number of magnetic levitation compressors are being sold to northern China. In northern China, where temperatures often drop below -20°C, many components in magnetic levitation compressor controllers no longer function properly. Therefore, utilizing existing components in magnetic levitation compressor controllers to operate properly in these extreme environments is crucial.

[0003] Magnetic levitation compressors are often installed in extremely harsh environments, such as underground garages, factory exteriors, and complex rooftops. Such extreme temperatures exceed the normal operating temperature of many electronic components, preventing the compressor from starting and levitating properly. Therefore, ensuring the proper operation of magnetic levitation compressor controllers in such harsh and cold environments is crucial.

[0004] The above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is prior art. Summary of the Invention

[0005] The object of the present invention is to provide a control device for a magnetic levitation compressor controller, a magnetic levitation compressor, and a control method for the magnetic levitation compressor controller, so as to solve the problem that the components of the magnetic levitation compressor controller cannot work normally under extreme ambient temperatures, thereby affecting the working reliability of the magnetic levitation compressor. The magnetic levitation compressor controller is enabled to self-start part of its own circuit to heat the ambient temperature under extreme ambient temperatures, so that the components of the magnetic levitation compressor controller can work normally under extreme ambient temperatures, thereby ensuring the working reliability of the magnetic levitation compressor.

[0006] The present invention provides a control device for a magnetic levitation compressor controller, wherein the magnetic levitation compressor controller is arranged in a housing of the magnetic levitation compressor; the magnetic levitation compressor controller includes: a control unit, an IPM unit and a heat sink; the control device for the magnetic levitation compressor controller includes: a sampling unit, a duty cycle unit and a switch unit; the switch unit is capable of switching the control unit to connect with the IPM unit, or the duty cycle unit to connect with the IPM unit; when the magnetic levitation compressor controller is working normally, the control unit is connected to the IPM unit through the switch unit, and the heat sink is connected to the IPM unit; wherein the sampling unit is configured to sample the ambient temperature of the space where the magnetic levitation compressor controller is located, which is recorded as the ambient temperature of the magnetic levitation compressor controller; the switch unit is configured to sample the ambient temperature of the space where the magnetic levitation compressor controller is located, which is recorded as the ambient temperature of the magnetic levitation compressor controller; When the ambient temperature of the magnetic levitation compressor controller is lower than the set temperature threshold, the switch unit disconnects the switch unit from the control unit and connects the switch unit to the duty cycle unit; the duty cycle unit is configured to generate a duty cycle signal according to the ambient temperature of the magnetic levitation compressor controller when the duty cycle unit is connected to the IPM unit through the switch unit; the IPM unit is configured to operate under the control of the duty cycle signal, and the IPM unit generates heat when it operates. The heat sink dissipates the heat from the IPM unit, so as to dissipate the heat generated during the operation of the IPM unit to the space where the magnetic levitation compressor controller is located, thereby heating the space where the magnetic levitation compressor controller is located, so that the ambient temperature of the magnetic levitation compressor controller reaches the set temperature threshold or even exceeds the set temperature threshold.

[0007] In some embodiments, it also includes: the switch unit is further configured to disconnect the switch unit itself from the duty cycle unit and connect the switch unit itself to the control unit when the ambient temperature of the magnetic levitation compressor controller reaches a set temperature threshold or even exceeds the set temperature threshold after controlling the IPM unit to operate under the control of the duty cycle signal, so that the magnetic levitation compressor controller can operate normally.

[0008] In some embodiments, the switch unit includes: a relay module; the control end of the relay module has a first contact and a second contact, the first contact is a normally closed contact, and the second contact is a normally open contact; the first contact is connected to the control unit, and the second contact is connected to the duty cycle unit.

[0009] In some embodiments, the control end of the relay module is a single-pole double-throw switch; the first switch of the single-pole double-throw switch serves as the first contact and is connected to the control unit; the second switch of the single-pole double-throw switch serves as the second contact and is connected to the duty cycle unit.

[0010] In some embodiments, the sampling unit includes: a fixed voltage-dividing resistor module, a thermistor voltage-dividing resistor module and a voltage sampling module; the fixed voltage-dividing resistor module and the thermistor voltage-dividing resistor module are arranged in series between a fixed voltage source and ground; the voltage sampling module samples from the common end of the fixed voltage-dividing resistor module and the thermistor voltage-dividing resistor module to obtain the ambient temperature of the magnetic levitation compressor controller.

[0011] In some embodiments, the duty cycle unit includes: a fixed waveform generator, a modulated waveform generator and a comparator; the duty cycle unit generates a duty cycle signal according to the ambient temperature of the magnetic levitation compressor controller, including: the fixed waveform generator is configured to generate a sawtooth wave of a set frequency according to a fixed voltage source; the modulated waveform generator is configured to generate a modulated wave according to the change in voltage on the thermistor voltage divider resistor module; the comparator is configured to compare the sawtooth wave of the set frequency with the modulated wave, and output a control wave whose duty cycle changes with the ambient temperature of the magnetic levitation compressor controller, which is recorded as a duty cycle signal.

[0012] Matching the above device, the present invention provides a magnetic levitation compressor on another aspect, including: a control device of the magnetic levitation compressor controller described above.

[0013] Matching the above-mentioned magnetic levitation compressor, the present invention provides, on another aspect, a control method for a magnetic levitation compressor controller of a magnetic levitation compressor, comprising: controlling a sampling unit to sample the ambient temperature of a space where the magnetic levitation compressor controller is located, recording the sample as the ambient temperature of the magnetic levitation compressor controller; controlling a switch unit, wherein when the ambient temperature of the magnetic levitation compressor controller is lower than a set temperature threshold, the switch unit disconnects the switch unit from the control unit and connects the switch unit to the duty cycle unit; controlling the duty cycle unit, wherein when the duty cycle unit is connected to the IPM unit via the switch unit, the switch unit generates a duty cycle signal according to the ambient temperature of the magnetic levitation compressor controller; and controlling the IPM unit to operate under the control of the duty cycle signal, wherein the IPM unit generates heat during operation, and the heat dissipating plate dissipates heat from the IPM unit, so as to dissipate heat generated during operation of the IPM unit to the space where the magnetic levitation compressor controller is located, thereby heating the space where the magnetic levitation compressor controller is located, so that the ambient temperature of the magnetic levitation compressor controller reaches the set temperature threshold or even exceeds the set temperature threshold.

[0014] In some embodiments, the duty cycle unit includes: a fixed waveform generator, a modulated waveform generator and a comparator; the duty cycle unit is controlled to generate a duty cycle signal according to the ambient temperature of the magnetic levitation compressor controller, including: controlling the fixed waveform generator to generate a sawtooth wave of a set frequency according to a fixed voltage source; controlling the modulated waveform generator to generate a modulated wave according to the change in voltage on the thermistor resistor module; controlling the comparator to compare the sawtooth wave of the set frequency with the modulated wave, and outputting a control wave whose duty cycle changes with the ambient temperature of the magnetic levitation compressor controller, which is recorded as a duty cycle signal.

[0015] In some embodiments, it further includes: a control switch unit, after controlling the IPM unit to operate under the control of the duty cycle signal, when the ambient temperature of the magnetic levitation compressor controller reaches a set temperature threshold or even exceeds the set temperature threshold, the switch unit disconnects the connection between the switch unit itself and the duty cycle unit, and connects the connection between the switch unit itself and the control unit to enable the magnetic levitation compressor controller to operate normally.

[0016] Therefore, the solution of the present invention is to provide a self-heating circuit on the basis of the normal working circuit of the magnetic levitation compressor controller itself. When the ambient temperature inside the box where the magnetic levitation compressor controller is located is lower than the set temperature threshold, the normal working circuit of the magnetic levitation compressor controller itself stops working and the self-heating circuit is operated to heat the environment inside the box where the magnetic levitation compressor controller is located, so that the ambient temperature inside the box where the magnetic levitation compressor controller is located increases, thereby ensuring that the ambient temperature inside the box where the magnetic levitation compressor controller is located is sufficient to enable the normal working circuit of the magnetic levitation compressor controller itself to operate. Therefore, by enabling the magnetic levitation compressor controller to self-start part of its own circuit to heat the ambient temperature under extreme ambient temperatures, the components of the magnetic levitation compressor controller can work normally under extreme ambient temperatures, thereby ensuring the operating reliability of the magnetic levitation compressor.

[0017] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention.

[0018] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of an embodiment of a control device of a magnetic levitation compressor controller according to the present invention;

[0020] Figure 2 Schematic diagram of the overall structure of the magnetic levitation compressor, wherein (a) is a schematic diagram of the external structure of the magnetic levitation compressor, and (b) is a schematic diagram of the partial cross-sectional structure of the magnetic levitation compressor;

[0021] Figure 3 A schematic structural diagram of an embodiment of a temperature heating control device in a bearing controller housing in a magnetic levitation compressor;

[0022] Figure 4 A schematic structural diagram of an embodiment of a temperature sampling circuit of a magnetic levitation compressor controller;

[0023] Figure 5 This is a voltage-temperature linear diagram of the temperature sampling circuit of the magnetic levitation compressor controller;

[0024] Figure 6 1 is a schematic structural diagram of an embodiment of a duty cycle simulation circuit;

[0025] Figure 7 1. It is a flow chart of an embodiment of a control method of a magnetic levitation compressor controller of the present invention;

[0026] Figure 81 is a flow chart of an embodiment of the method of the present invention for generating a duty cycle signal according to the ambient temperature of the magnetic levitation compressor controller;

[0027] Figure 9 The figure is a flow chart of an embodiment of a method for controlling the temperature heating of a casing of a magnetic levitation compressor controller. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Considering that the various magnetic levitation compressor controllers in the relevant solutions have different structures, they will all encounter the following situations. The first situation: the operating environment of the magnetic levitation compressor is cold and harsh, and the magnetic levitation compressor controller cannot operate normally. The components of the magnetic levitation compressor controller have temperature limits for normal operation, such as -20-80℃. If the temperature exceeds or falls below this limit, it cannot operate, affecting the working reliability of the magnetic levitation compressor; the second situation: it is necessary to provide a better environment for the magnetic levitation compressor. The better environment refers to the indoor constant temperature area or the area with a temperature higher than the cold environment, but it will increase the site cost; the third situation: additional environmental heating equipment is required. If the magnetic levitation compressor controller and compressor cannot operate normally, it is necessary to increase the ambient temperature of the compressor to enable the magnetic levitation compressor controller to operate normally.

[0030] Therefore, the present invention proposes a control method for a magnetic levitation compressor controller, specifically a solution for enabling the magnetic levitation compressor controller to self-heat and start under extremely harsh cold conditions. By enabling the magnetic levitation compressor controller to self-start part of its own circuits under extreme ambient temperatures to heat the ambient temperature, the components of the magnetic levitation compressor controller can operate normally under extreme ambient temperatures, thereby ensuring the operating reliability of the magnetic levitation compressor.

[0031] According to an embodiment of the present invention, a control device for a magnetic levitation compressor controller is provided. Figure 1 The structure diagram of an embodiment of the device of the present invention is shown in FIG. The magnetic levitation compressor controller is arranged in the housing of the magnetic levitation compressor. Specifically, Figure 2 Figure 1 is a schematic diagram of the overall structure of the magnetic levitation compressor. Figure 2 As shown, the magnetic levitation compressor controller, such as the bearing controller, is installed on Figure 2The interior of the magnetic levitation compressor housing is shown. Magnetic levitation compressors are often installed in extremely harsh environments, such as underground garages, factory exteriors, and complex rooftops. With the arrival of autumn and winter, ambient temperatures in more and more areas drop dramatically. Such extreme cold temperatures exceed the normal operating temperature of many components in the magnetic levitation compressor controller, causing the magnetic levitation compressor to fail to start or levitate properly.

[0032] In the solution of the present invention, the magnetic levitation compressor controller includes a control unit, such as an MCU control module, an IPM unit, such as an IPM intelligent module, and a heat sink, such as a radiator. The control unit is configured to control the operation of the IPM unit. The IPM unit, under the control of the control unit, is configured to control the operation of the coil of the magnetic levitation compressor. The IPM unit generates heat during operation, and the heat sink is configured to dissipate heat from the IPM intelligent module.

[0033] See also Figure 1 In the example shown, the control device of the magnetic levitation compressor controller includes: a sampling unit, a duty cycle unit, and a switch unit. The sampling unit is such as a controller ambient temperature sampling module, the duty cycle unit is such as a duty cycle simulation circuit, and the switch unit is such as a relay module. The switch unit can switchably connect the control unit to the IPM unit, or connect the duty cycle unit to the IPM unit. When the magnetic levitation compressor controller is operating normally, the control unit is connected to the IPM unit through the switch unit, and the heat sink is connected to the IPM unit.

[0034] The sampling unit is configured to sample the ambient temperature of the space where the magnetic levitation compressor controller is located during the operation of the magnetic levitation compressor controller, which is recorded as the ambient temperature of the magnetic levitation compressor controller, such as the controller box temperature.

[0035] The switch unit is configured to disconnect the connection between the switch unit itself and the control unit and connect the connection between the switch unit itself and the duty cycle unit when the ambient temperature of the magnetic levitation compressor controller is lower than a set temperature threshold.

[0036] The duty cycle unit is configured to generate a duty cycle signal according to the ambient temperature of the magnetic levitation compressor controller when the duty cycle unit itself is connected to the IPM unit through the switch unit.

[0037] The IPM unit is configured to operate under the control of the duty cycle signal. The IPM unit itself generates heat during operation. The heat sink dissipates heat from the IPM unit to dissipate the heat generated during the operation of the IPM unit to the space where the magnetic levitation compressor controller is located, thereby heating the space where the magnetic levitation compressor controller is located so that the ambient temperature of the magnetic levitation compressor controller reaches a set temperature threshold or even exceeds the set temperature threshold.

[0038] The solution of the present invention proposes a method for enabling a magnetic levitation compressor controller to self-heat and start under extremely severe cold conditions. The method can detect the ambient temperature of the magnetic levitation compressor controller without adding any peripherals and without requiring the ambient temperature to be hot or cold, and automatically start part of the circuit of the magnetic levitation compressor controller to heat the ambient temperature of the magnetic levitation compressor controller, so that the magnetic levitation compressor controller can reach a normal operating state, realize the self-starting and normal operation of the magnetic levitation compressor controller, and improve the safety and reliability of the operation of the magnetic levitation compressor controller.

[0039] In some embodiments, the control device of the magnetic levitation compressor controller described in the solution of the present invention further includes: the switch unit is further configured to, after controlling the IPM unit to operate under the control of the duty cycle signal, disconnect the switch unit from the duty cycle unit and connect the switch unit to the control unit when the ambient temperature of the magnetic levitation compressor controller reaches or exceeds the set temperature threshold, so that the magnetic levitation compressor controller can operate normally. In this way, when the magnetic levitation compressor controller operates normally, the control unit is connected to the IPM unit through the switch unit, and the heat sink is connected to the IPM unit.

[0040] In some embodiments, the switch unit includes a relay module. A control terminal of the relay module has a first contact and a second contact, wherein the first contact is a normally closed contact and the second contact is a normally open contact. The first contact is connected to the control unit, and the second contact is connected to the duty cycle unit.

[0041] Preferably, the control end of the relay module is a single-pole double-throw switch, wherein the first switch of the single-pole double-throw switch serves as the first contact and is connected to the control unit, and the second switch of the single-pole double-throw switch serves as the second contact and is connected to the duty cycle unit.

[0042] Specifically, Figure 3 This is a schematic diagram of the structure of an embodiment of a temperature heating control device in a bearing controller housing in a magnetic levitation compressor. Figure 3 As shown, the temperature heating control device within the bearing controller housing of a magnetic levitation compressor includes a relay module, a magnetic levitation compressor controller ambient temperature sampling module, a duty cycle simulation circuit, an MCU control module, an IPM intelligent module, a compressor coil, and a heat sink. The magnetic levitation compressor controller ambient temperature sampling module is connected to the relay module, which is in turn connected to the IPM intelligent module. The IPM intelligent module is connected to the compressor coil and the heat sink, respectively. The relay module is a single-pole double-throw switch, which is connected to the duty cycle simulation circuit and the MCU control module, respectively.

[0043] exist Figure 3 In the example shown, the relay module is a single-pole, double-throw switch controlled by the magnetic levitation compressor controller's environmental sampling module. Normally, the relay module is in a normally closed state with the MCU control module. When the ambient temperature reaches the failure temperature of components in the magnetic levitation compressor controller, the connection between the relay module and the MCU control module is disconnected, and the connection between the duty cycle simulation circuit module and the relay module is closed.

[0044] Under normal circumstances, the operating logic of the bearing controller is: MCU control module → relay module → IPM intelligent module → compressor coil, so that the compressor can operate normally. Under abnormally cold temperature conditions, the operating logic of the bearing controller is: duty cycle simulation circuit → relay module → IPM intelligent module → compressor coil. At this time, the IPM intelligent module heats its heat sink to heat the temperature inside the box where the bearing controller is located, so that the compressor can start normally. Here, the IPM intelligent module can operate under low ambient temperature conditions, and the IPM intelligent module will generate heat when it is working. The heat generated by the IPM intelligent module when it is working is dissipated by the heat sink to the IPM intelligent module. In the solution of the present invention, the heat generated by the IPM intelligent module can be dissipated to the environment through the heat sink to heat the ambient temperature.

[0045] In some embodiments, the sampling unit includes a fixed voltage-dividing resistor module, a thermistor voltage-dividing resistor module, and a voltage sampling module, such as a voltage sensor. The fixed voltage-dividing resistor module and the thermistor voltage-dividing resistor module are arranged in series between a fixed voltage source and ground. The voltage sampling module samples the common terminal of the fixed voltage-dividing resistor module and the thermistor voltage-dividing resistor module to obtain the ambient temperature of the magnetic levitation compressor controller.

[0046] Specifically, Figure 4 The figure is a schematic diagram of the structure of an embodiment of a temperature sampling circuit of a magnetic levitation compressor controller (i.e., a temperature sampling module of a magnetic levitation compressor controller). Figure 4As can be seen, the temperature sampling system consists of a voltage sampling module and a peripheral sampling circuit. In the peripheral sampling circuit, a fixed voltage is input to a fixed voltage divider resistor and a high-precision thermistor. The voltage sampling module collects the resistance value across the high-precision thermistor, thus forming the ambient temperature sampling module of the magnetic levitation compressor controller.

[0047] Figure 5 This is a voltage-temperature linear diagram of the temperature sampling circuit of the magnetic levitation compressor controller. Figure 4 In the example shown, according to the characteristics of the high-precision thermistor, the voltage across the resistor decreases as the temperature rises, forming a linear relationship. The voltage sampling module collects the voltage change in real time and Figure 5 The linear curve shown is compared to the voltage-temperature linear graph. Different voltages correspond to different temperatures, which is used to determine the real-time ambient temperature inside the magnetic levitation compressor controller housing, thereby controlling the operating state of the relay module. The controller sampling module is a complete control circuit with built-in control logic. It can monitor voltage changes, namely ambient temperature changes, in real time and control the relay (a single-pole double-ended switch) based on the voltage changes. For example, if the ambient temperature inside the magnetic levitation compressor controller housing is higher than the minimum component operating temperature, the power supply between the control relay module and the duty cycle simulation circuit will be disconnected. Conversely, if the ambient temperature inside the magnetic levitation compressor controller housing is lower than the minimum component operating temperature, the power supply between the control relay module and the duty cycle simulation circuit will be connected to ensure stable operation of the magnetic levitation compressor controller.

[0048] In some embodiments, the duty cycle unit includes: a fixed waveform generator, a modulated waveform generator, and a comparator. The fixed waveform generator is such as a fixed sawtooth wave generator, and the modulated waveform generator is such as a voltage sampling modulated waveform generator.

[0049] The duty cycle unit, when the duty cycle unit itself is connected to the IPM unit through the switch unit, generates a duty cycle signal according to the ambient temperature of the magnetic levitation compressor controller, including:

[0050] The fixed waveform generator is configured to generate a sawtooth wave of a set frequency according to a fixed voltage source.

[0051] The modulation waveform generator is configured to generate a modulation wave according to the change in voltage on the thermistor voltage divider resistor module when the voltage sampling module samples the ambient temperature of the magnetic levitation compressor controller from the common end of the fixed voltage divider resistor module and the thermistor voltage divider resistor module.

[0052] The comparator is configured to compare the sawtooth wave of the set frequency with the modulation wave, and output a control wave whose duty cycle changes with the ambient temperature of the magnetic levitation compressor controller, which is recorded as a duty cycle signal.

[0053] Specifically, Figure 6 FIG. 1 is a structural diagram of an embodiment of a duty cycle simulation circuit. Figure 6 As shown, a fixed sawtooth generator generates a sawtooth wave of the desired frequency. A temperature sampling circuit (i.e., the temperature sampling circuit of the magnetic levitation compressor controller) collects the variation in the high-precision thermistor voltage to generate a modulating wave. These two waveforms are fed into a comparator module to generate a variable duty cycle output control wave that changes with ambient temperature. This controls the on-time of the magnetic levitation compressor controller's IPM intelligent module (IPM) (to prevent overheating and damage), heating the heat sink and indirectly increasing the ambient temperature within the magnetic levitation compressor controller's enclosure.

[0054] According to the technical solution of the present invention, a self-heating circuit is provided on the basis of the normal operating circuit of the magnetic levitation compressor controller itself. When the ambient temperature inside the box where the magnetic levitation compressor controller is located is lower than a set temperature threshold, the normal operating circuit of the magnetic levitation compressor controller itself stops operating and the self-heating circuit is operated to heat the environment inside the box where the magnetic levitation compressor controller is located, thereby increasing the ambient temperature inside the box where the magnetic levitation compressor controller is located, thereby ensuring that the ambient temperature inside the box where the magnetic levitation compressor controller is located is sufficient to enable the normal operating circuit of the magnetic levitation compressor controller itself to operate. Thus, by enabling the magnetic levitation compressor controller to self-start part of its own circuit to heat the ambient temperature under extreme ambient temperatures, the components of the magnetic levitation compressor controller can operate normally under extreme ambient temperatures, thereby ensuring the operating reliability of the magnetic levitation compressor.

[0055] According to an embodiment of the present invention, a magnetic levitation compressor corresponding to a control device of a magnetic levitation compressor controller is further provided. The magnetic levitation compressor may include: the control device of the magnetic levitation compressor controller described above.

[0056] Since the processing and functions implemented by the magnetic levitation compressor of this embodiment basically correspond to the embodiments, principles and examples of the device, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0057] According to the technical solution of the present invention, a self-heating circuit is provided on the basis of the normal operating circuit of the magnetic levitation compressor controller itself. When the ambient temperature inside the box where the magnetic levitation compressor controller is located is lower than a set temperature threshold, the normal operating circuit of the magnetic levitation compressor controller itself stops operating and the self-heating circuit is operated to heat the environment inside the box where the magnetic levitation compressor controller is located, thereby increasing the ambient temperature inside the box where the magnetic levitation compressor controller is located. This ensures that the ambient temperature inside the box where the magnetic levitation compressor controller is located is sufficient to enable the normal operating circuit of the magnetic levitation compressor controller itself to operate, thereby enabling the magnetic levitation compressor controller to reach a normal operating state, thereby improving the safety and reliability of the operation of the magnetic levitation compressor controller.

[0058] According to an embodiment of the present invention, a control method of a magnetic levitation compressor controller corresponding to a magnetic levitation compressor is also provided, such as Figure 7 FIG2 is a flow chart of an embodiment of the method of the present invention. The control method of the magnetic levitation compressor controller of the magnetic levitation compressor may include steps S110 to S140.

[0059] In step S110, the sampling unit is controlled to sample the ambient temperature of the space where the magnetic levitation compressor controller is located during the operation of the magnetic levitation compressor controller, and record it as the ambient temperature of the magnetic levitation compressor controller, such as the controller box temperature.

[0060] At step S120, the switch unit is controlled. When the ambient temperature of the magnetic levitation compressor controller is lower than the set temperature threshold, the switch unit disconnects the connection between the switch unit itself and the control unit, and connects the connection between the switch unit itself and the duty cycle unit.

[0061] In step S130 , the duty cycle unit is controlled to generate a duty cycle signal according to the ambient temperature of the magnetic levitation compressor controller when the duty cycle unit is connected to the IPM unit via the switch unit.

[0062] At step S140, the IPM unit is controlled to operate under the control of the duty cycle signal. The IPM unit generates heat during operation, and the heat sink dissipates heat from the IPM unit to dissipate the heat generated during the operation of the IPM unit to the space where the magnetic levitation compressor controller is located, thereby heating the space where the magnetic levitation compressor controller is located, so that the ambient temperature of the magnetic levitation compressor controller reaches a set temperature threshold or even exceeds the set temperature threshold.

[0063] The solution of the present invention proposes a method for enabling a magnetic levitation compressor controller to self-heat and start under extremely severe cold conditions. The method can detect the ambient temperature of the magnetic levitation compressor controller without adding any peripherals and without requiring the ambient temperature to be hot or cold, and automatically start part of the circuit of the magnetic levitation compressor controller to heat the ambient temperature of the magnetic levitation compressor controller, so that the magnetic levitation compressor controller can reach a normal operating state, realize the self-starting and normal operation of the magnetic levitation compressor controller, and improve the safety and reliability of the operation of the magnetic levitation compressor controller.

[0064] In some embodiments, the duty cycle unit includes: a fixed waveform generator, a modulated waveform generator, and a comparator. The fixed waveform generator is such as a fixed sawtooth wave generator, and the modulated waveform generator is such as a voltage sampling modulated waveform generator.

[0065] In step S130, the duty cycle unit is controlled. When the duty cycle unit itself is connected to the IPM unit through the switch unit, a specific process of generating a duty cycle signal according to the ambient temperature of the magnetic levitation compressor controller is described in the following exemplary embodiment.

[0066] The following combination Figure 8 The flowchart of an embodiment of generating a duty cycle signal according to the ambient temperature of the magnetic levitation compressor controller in the method of the present invention further illustrates the specific process of generating a duty cycle signal according to the ambient temperature of the magnetic levitation compressor controller in step S130, including: steps S210 to S230.

[0067] In step S210 , the fixed waveform generator is controlled to generate a sawtooth wave of a set frequency according to a fixed voltage source.

[0068] Step S220, controlling the modulation waveform generator to generate a modulation wave according to the change in voltage on the thermistor voltage-dividing resistor module when the voltage sampling module samples the ambient temperature of the magnetic levitation compressor controller from the common end of the fixed voltage-dividing resistor module and the thermistor voltage-dividing resistor module.

[0069] In step S230 , the comparator is controlled to compare the sawtooth wave of the set frequency with the modulation wave, and output a control wave whose duty cycle changes with the ambient temperature of the magnetic levitation compressor controller, which is recorded as a duty cycle signal.

[0070] Specifically, see Figure 6In the example shown, a fixed sawtooth generator generates a sawtooth wave of the desired frequency. A temperature sampling circuit (i.e., the temperature sampling circuit of the magnetic levitation compressor controller) collects the voltage variation of a high-precision thermistor to generate a modulating waveform. These two waveforms are fed into a comparator module to generate a variable duty cycle output control waveform that varies with ambient temperature. This controls the on-time of the magnetic levitation compressor controller's intelligent module (IPM) (to prevent overheating and damage), thereby heating the heat sink and indirectly increasing the ambient temperature within the magnetic levitation compressor controller's enclosure.

[0071] In some embodiments, the control method of the magnetic levitation compressor controller described in the solution of the present invention further includes: controlling the switch unit, after controlling the IPM unit to operate under the control of the duty cycle signal, when the ambient temperature of the magnetic levitation compressor controller reaches a set temperature threshold or even exceeds the set temperature threshold, the switch unit disconnects the connection between the switch unit itself and the duty cycle unit, and connects the switch unit itself to the control unit, so that the magnetic levitation compressor controller operates normally. In this way, when the magnetic levitation compressor controller operates normally, the control unit is connected to the IPM unit through the switch unit, and the heat sink is connected to the IPM unit.

[0072] Specifically, Figure 9 FIG. 1 is a flow chart of an embodiment of a method for controlling the temperature heating of a box of a magnetic levitation compressor controller. Figure 9 As shown, the solution of the present invention provides a method for controlling the box temperature heating of a magnetic levitation compressor controller, comprising:

[0073] Step 1: The magnetic levitation compressor controller ambient temperature sampling module samples the ambient temperature inside the box where the magnetic levitation compressor controller is located, which is recorded as the magnetic levitation compressor controller box temperature, and then step 2 is executed.

[0074] Step 2: Determine whether the temperature of the magnetic levitation compressor controller case is lower than a set temperature threshold, such as -20°C. That is, the ambient temperature sampling circuit in the case collects the voltage change across the high-precision thermistor in real time to determine whether the voltage across the resistor is lower than the threshold, that is, whether the temperature of the magnetic levitation compressor controller case is lower than -20°C. If so, execute step 3; otherwise, execute step 4.

[0075] Step 3: When the temperature inside the magnetic levitation compressor controller box is lower than -20°C, the ambient temperature sampling module controls the relay module to disconnect from the MCU control module and controls the relay module to connect to the duty cycle simulation circuit. Figure 3The relay module is connected to the MCU control module and the duty cycle simulation circuit via a single-pole double-throw switch. The duty cycle simulation circuit outputs the required duty cycle based on the change in ambient temperature, controlling the on-time of the IPM module, heating the heat sink, and thus the temperature inside the magnetic levitation compressor controller box.

[0076] Step 4: When the temperature inside the magnetic levitation compressor controller box is higher than -20°C, the ambient temperature sampling module controls the relay module to disconnect the analog circuit and reconnect the MCU control module, thereby allowing the magnetic levitation compressor controller to operate normally.

[0077] The present invention provides a circuit and a self-heating device for the magnetic levitation compressor controller to self-heat some of its components in extremely cold environments. This allows the magnetic levitation compressor controller to detect its ambient temperature and self-heat to the ambient temperature without requiring any additional peripherals or a hot or cold environment, thereby enabling normal operation. This extends the temperature range within which the magnetic levitation compressor can operate normally, significantly reducing environmental requirements for the unit. This allows the magnetic levitation compressor controller to operate normally in extremely cold conditions, improving the safety and reliability of its operation. Furthermore, it reduces the cost of use for customers, allowing them to purchase with confidence and use with ease.

[0078] Since the processing and functions implemented by the method of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned magnetic levitation compressor, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0079] By adopting the technical solution of this embodiment, a self-heating circuit is provided on the basis of the normal operating circuit of the magnetic levitation compressor controller itself. When the ambient temperature inside the box where the magnetic levitation compressor controller is located is lower than the set temperature threshold, the normal operating circuit of the magnetic levitation compressor controller itself stops operating and the self-heating circuit is operated to heat the environment inside the box where the magnetic levitation compressor controller is located, thereby increasing the ambient temperature inside the box where the magnetic levitation compressor controller is located. This ensures that the ambient temperature inside the box where the magnetic levitation compressor controller is located is sufficient to enable the normal operating circuit of the magnetic levitation compressor controller itself to operate, thereby achieving self-starting and normal operation of the magnetic levitation compressor controller, which is reliable and safe.

[0080] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0081] The foregoing description is merely an embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of the claims.

Claims

1. A control device for a magnetic levitation compressor controller, characterized in that: The magnetic levitation compressor controller is arranged in the housing of the magnetic levitation compressor; The magnetic levitation compressor controller includes: a control unit, an IPM unit and a heat sink; the control device of the magnetic levitation compressor controller includes: a sampling unit, a duty cycle unit and a switch unit; the switch unit can switchably connect the control unit to the IPM unit, or connect the duty cycle unit to the IPM unit; when the magnetic levitation compressor controller is operating normally, the control unit is connected to the IPM unit through the switch unit, and the heat sink is connected to the IPM unit; wherein, The sampling unit is configured to sample the ambient temperature of the space where the magnetic levitation compressor controller is located, which is recorded as the ambient temperature of the magnetic levitation compressor controller; The switch unit is configured to disconnect the switch unit from the control unit and connect the switch unit to the duty cycle unit when the ambient temperature of the magnetic levitation compressor controller is lower than a set temperature threshold; The duty cycle unit is configured to generate a duty cycle signal according to the ambient temperature of the magnetic levitation compressor controller when the duty cycle unit itself is connected to the IPM unit through the switch unit; the duty cycle unit includes: a fixed waveform generator, a modulated waveform generator and a comparator; the duty cycle unit generates the duty cycle signal according to the ambient temperature of the magnetic levitation compressor controller, including: the fixed waveform generator is configured to generate a sawtooth wave of a set frequency based on a fixed voltage source; the modulated waveform generator is configured to generate a modulated wave based on the change in voltage on the thermistor divider resistor module; the comparator is configured to compare the sawtooth wave of the set frequency with the modulated wave, and output a control wave whose duty cycle changes with the change in the ambient temperature of the magnetic levitation compressor controller, which is recorded as the duty cycle signal; The IPM unit is configured to operate under the control of the duty cycle signal. The IPM unit itself generates heat during operation. The heat sink dissipates heat from the IPM unit to dissipate the heat generated during the operation of the IPM unit to the space where the magnetic levitation compressor controller is located, thereby heating the space where the magnetic levitation compressor controller is located so that the ambient temperature of the magnetic levitation compressor controller reaches a set temperature threshold or even exceeds the set temperature threshold.

2. The control device of the magnetic levitation compressor controller according to claim 1, characterized in that: Also includes: The switch unit is further configured to disconnect the switch unit from the duty cycle unit and connect the switch unit to the control unit when the ambient temperature of the magnetic levitation compressor controller reaches a set temperature threshold or even exceeds the set temperature threshold after the IPM unit is controlled to operate under the control of the duty cycle signal, so that the magnetic levitation compressor controller can operate normally.

3. The control device of the magnetic levitation compressor controller according to claim 1 or 2, characterized in that: The switch unit includes: a relay module; the control end of the relay module has a first contact and a second contact, the first contact is a normally closed contact, and the second contact is a normally open contact; the first contact is connected to the control unit, and the second contact is connected to the duty cycle unit.

4. The control device of the magnetic levitation compressor controller according to claim 3, characterized in that: The control end of the relay module is a single-pole double-throw switch; the first switch of the single-pole double-throw switch serves as the first contact and is connected to the control unit; the second switch of the single-pole double-throw switch serves as the second contact and is connected to the duty cycle unit.

5. The control device of the magnetic levitation compressor controller according to claim 1 or 2, characterized in that: The sampling unit includes: a fixed voltage-dividing resistor module, a thermistor voltage-dividing resistor module and a voltage sampling module; the fixed voltage-dividing resistor module and the thermistor voltage-dividing resistor module are arranged in series between a fixed voltage source and ground; the voltage sampling module samples from the common end of the fixed voltage-dividing resistor module and the thermistor voltage-dividing resistor module to obtain the ambient temperature of the magnetic levitation compressor controller.

6. A magnetic levitation compressor, characterized in that: include: The control device of the magnetic levitation compressor controller according to any one of claims 1 to 5.

7. A control method for a magnetic levitation compressor controller of a magnetic levitation compressor according to claim 6, characterized in that: include: Controlling the sampling unit to sample the ambient temperature of the space where the magnetic levitation compressor controller is located, and recording the sample as the ambient temperature of the magnetic levitation compressor controller; controlling the switch unit, so that when the ambient temperature of the magnetic levitation compressor controller is lower than a set temperature threshold, the switch unit disconnects the connection between the switch unit itself and the control unit, and connects the connection between the switch unit itself and the duty cycle unit; controlling a duty cycle unit to generate a duty cycle signal according to an ambient temperature of the magnetic levitation compressor controller when the duty cycle unit is connected to the IPM unit via the switch unit; The IPM unit is controlled to operate under the control of the duty cycle signal. The IPM unit generates heat during operation. The heat sink dissipates heat from the IPM unit to dissipate the heat generated during the operation of the IPM unit to the space where the magnetic levitation compressor controller is located. The space where the magnetic levitation compressor controller is located is heated to make the ambient temperature of the magnetic levitation compressor controller reach a set temperature threshold or even higher than the set temperature threshold.

8. The control method of the magnetic levitation compressor controller according to claim 7, characterized in that: The duty cycle unit includes: a fixed waveform generator, a modulation waveform generator and a comparator; The duty cycle control unit generates a duty cycle signal according to the ambient temperature of the magnetic levitation compressor controller, comprising: Control the fixed waveform generator to generate a sawtooth wave of a set frequency according to a fixed voltage source; Controlling the modulation waveform generator to generate a modulation wave according to the change in voltage on the thermistor voltage divider resistor module; The control comparator compares the sawtooth wave of the set frequency with the modulation wave, and outputs a control wave whose duty cycle changes with the ambient temperature of the magnetic levitation compressor controller, which is recorded as a duty cycle signal.

9. The control method of the magnetic levitation compressor controller according to claim 7 or 8, characterized in that: Also includes: The control switch unit is configured to disconnect the switch unit from the duty cycle unit and connect the switch unit to the control unit after the IPM unit is controlled to operate under the control of the duty cycle signal. When the ambient temperature of the magnetic levitation compressor controller reaches a set temperature threshold or even exceeds the set temperature threshold, the switch unit disconnects the switch unit from the duty cycle unit and connects the switch unit from the control unit to enable the magnetic levitation compressor controller to operate normally.

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