IGBT and high-frequency filter capacitor collaborative temperature control device and method and hot water unit

Abstract

The invention discloses an IGBT and high-frequency filter capacitor collaborative temperature control device and method and a hot water unit. The device comprises a controller, multi-gear driving resistor modules and a phase inverter, and the first signal input end of each multi-gear driving resistor module is connected with the driving signal output end of the controller; the second signal input end is connected with the corresponding control signal output end of the controller; the signal output end is connected with the corresponding IGBT module and the input end of the phase inverter; the output ends of the phase inverters are connected with the corresponding IGBT modules; the controller collects the temperature of a high-frequency filter capacitor and each IGBT module in the frequency converter in real time; when only the temperature of the high-frequency filter capacitor is greater than a capacitor temperature threshold value / the temperature of a certain IGBT module is greater than an IGBT temperature threshold value, the driving resistance of each multi-gear driving resistance module connected to each / corresponding IGBT module is controlled to be increased / decreased; when the temperature of the high-frequency filter capacitor is larger than the capacitor temperature threshold value and the temperature of the IGBT module is larger than the IGBT temperature threshold value, the controller collects cooperative control related data to determine a cooperative control adjustment strategy. The safety of the frequency converter is improved.

Description

Technical Field

[0001] This invention belongs to the field of frequency converter technology, specifically relating to an IGBT, a high-frequency filter capacitor coordinated temperature control device, a method, and a hot water unit. Background Technology

[0002] In inverter design, there is a problem of overheating in the stacked busbar high-frequency filter capacitor (CBB capacitor) and the insulated gate bipolar transistor (IGBT). The existing solution is to increase the drive resistor Rg when the CBB capacitor overheats, thereby reducing the voltage change rate dv / dt and reducing the high-frequency loss of the CBB capacitor; when the IGBT overheats, the drive resistor Rg is reduced, thereby reducing the switching loss. Finding a suitable Rg to balance the temperature of the two is difficult, but if high temperature occurs during operation, the problem cannot be solved.

[0003] The circuit connection of the existing frequency converter is shown in Figure 1. AC mains power is directly connected to the AC input terminal of the rectifier bridge, and after rectification, it is converted to DC power. The positive and negative terminals of the DC bus of the rectifier bridge are connected to the positive and negative terminals of the high-frequency filter capacitor, respectively. That is, the high-frequency filter capacitor is connected in parallel to the DC bus to smooth the rectified DC power, supplying power to all IGBT modules. In each IGBT module, the collector of the upper IGBT is connected to the positive terminal of the DC bus, and the emitter of the lower IGBT is connected to the negative terminal of the DC bus. The controller's drive output terminal is connected to one end of the drive resistor of each IGBT module and outputs a PWM control signal to the drive resistor. The other end of each drive resistor is simultaneously connected to the gate of the upper IGBT in the corresponding IGBT module and the input terminal of the inverter (e.g., ...). Figure 1 As shown, the drive resistors Rg of IGBT1 module, Rg' of IGBT2 module, and Rg' of IGBT3 module are connected at one end to the controller and at the other end to the gate of the upper arm IGBT in IGBT1, IGBT2, and IGBT3 modules, as well as the input of the corresponding inverter. The output of the inverter is then connected to the gate of the lower arm IGBT in the same IGBT module. Finally, the output of the IGBT module is connected to a motor or other load to achieve frequency conversion output.

[0004] Existing technology includes a control method, control system, and related equipment for a variable frequency power supply, relating to the field of variable frequency drive control technology. The method includes: responding to the startup and operation of the variable frequency power supply, generating an SPWM signal based on an SPWM module to drive and control the IGBT within the variable frequency power supply to output a sinusoidal voltage; acquiring the IGBT temperature and ambient temperature during IGBT operation, determining the IGBT temperature rise based on the IGBT temperature and ambient temperature, and determining a target carrier ratio based on the IGBT temperature rise; adjusting the SPWM signal according to the target carrier ratio, and driving the IGBT to turn on and off according to the adjusted SPWM signal, thereby achieving IGBT temperature rise control.

[0005] Existing technology includes a closed-loop protection method for IGBT over-temperature protection of hoist inverters based on switching frequency regulation. The steps are: Step 1: IGBT junction resistance detection; Step 2: IGBT junction temperature calculation; Step 3: Switching frequency regulation. This invention directly detects the IGBT junction resistance and accurately calculates the junction temperature for NPC three-level inverters, providing a more accurate reflection of the IGBT's internal temperature. This invention establishes a temperature closed loop, independently and dynamically adjusting the IGBT temperature of the rectifier and inverter in real time by regulating the IGBT switching frequency to ensure they operate within a safe temperature range. It also controls the inverter to reduce the hoist speed while maintaining constant torque, keeping the system in a slow and stable operating phase.

[0006] However, the existing technologies mentioned above only control the temperature of the IGBT, and do not control the temperature of the high-frequency filter capacitor. Summary of the Invention

[0007] To address the shortcomings of existing technologies, such as the inability to achieve coordinated control of IGBT temperature and high-frequency filter capacitor temperature, and the inability to effectively cool both IGBT and high-frequency filter capacitor simultaneously when their temperatures are too high, resulting in low inverter reliability, low safety, low operating efficiency, and high maintenance costs, this invention provides an IGBT and high-frequency filter capacitor coordinated temperature control device, method, and hot water unit.

[0008] The present invention adopts the following technical solution.

[0009] This invention discloses an IGBT and high-frequency filter capacitor coordinated temperature control device, including a controller, a multi-stage drive resistor module corresponding to each IGBT module in the frequency converter, and an inverter: The first signal input terminal of each of the multi-stage drive resistor modules is connected to the drive signal output terminal of the controller; the second signal input terminal is connected to the corresponding control signal output terminal of the controller; the signal output terminal of the multi-stage drive resistor module is connected to the gate of the upper bridge arm IGBT in the corresponding IGBT module, and the input terminal of the corresponding inverter. The output of the inverter is connected to the gate of the lower arm IGBT in the IGBT module. The controller collects the temperatures of the high-frequency filter capacitor and each IGBT module in the inverter in real time. When the temperature of the high-frequency filter capacitor is greater than or equal to a preset capacitor temperature threshold, and the temperatures of each IGBT module are less than the preset IGBT temperature threshold, the controller outputs a first control signal through each control signal output terminal to increase the drive resistance of each of the multi-stage drive resistor modules connected to the IGBT module. When the temperature of the high-frequency filter capacitor is less than the capacitor temperature threshold, and the temperature of a certain IGBT module is greater than or equal to the IGBT temperature threshold, the controller outputs a second control signal through the control signal output terminal corresponding to that IGBT module to decrease the drive resistance of the multi-stage drive resistor module connected to that IGBT module. When both the temperature of the high-frequency filter capacitor and the temperature of the IGBT module are greater than or equal to the IGBT temperature threshold, the controller collects collaborative control related data and determines a collaborative control adjustment strategy based on the collaborative control related data.

[0010] More preferably, Each of the multi-stage drive resistor modules includes an excitation winding, a transistor, a first resistor, a second resistor, a first switch, and a second switch; One end of the excitation winding is connected to the collector of the transistor, and the other end is connected to the positive terminal of the DC power supply. The emitter of the transistor is grounded, and the base is connected to the corresponding control signal output terminal of the controller. The transistor is turned on and off based on the received first control signal or second control signal; the first control signal is high level; the second control signal is low level. The first end of the first resistor is connected to the drive signal output terminal of the controller; the second end is connected to the first end of the first switch. The first end of the second resistor is connected to the drive signal output terminal of the controller; the second end is connected to the first end of the second switch. The second terminals of the first switch and the second switch are both connected to the signal output terminal of the multi-stage drive resistor module; the first switch and the second switch are normally open and normally closed switches, respectively; when the base of the transistor receives the high level, the excitation winding is energized, the normally closed switch is open, and the normally open switch is closed; when the base of the transistor receives the low level, the excitation winding is not energized, the normally closed switch is closed, and the normally open switch is open.

[0011] More preferably, In the controller, the collaborative control-related data includes the unit's current water temperature, ambient temperature, inverter input voltage, and DC bus current.

[0012] More preferably, In the controller, determining the collaborative control adjustment strategy based on the collaborative control-related data includes: Determine whether the collaborative control-related data meets the harsh operating conditions. If the conditions are met, the compressor frequency reduction range is determined based on the current water temperature of the unit and the target water temperature of the unit. The compressor frequency is reduced based on the compressor frequency reduction range until the temperature of the high-frequency filter capacitor is less than the capacitor temperature threshold and the temperature of the IGBT module is less than the IGBT temperature threshold. Every set second time interval, the compressor frequency is increased by a set frequency recovery value until the compressor frequency is equal to that before the reduction. If the conditions are not met, the switching frequency of the IGBT module is reduced based on the preset switching frequency reduction, until the temperature of the high-frequency filter capacitor is lower than the capacitor temperature threshold and the temperature of the IGBT module is lower than the IGBT temperature threshold.

[0013] More preferably, The severe operating conditions include a first severe operating condition sub-condition, a second severe operating condition sub-condition, and a third severe operating condition sub-condition; The first severe operating condition sub-condition refers to an ambient temperature greater than or equal to a preset ambient temperature threshold. The second adverse operating condition is that the inverter input voltage is less than or equal to a preset voltage threshold. The third severe operating condition is that the DC bus current is greater than or equal to a preset current threshold. When the first severe operating condition sub-condition, the second severe operating condition sub-condition, or the third severe operating condition sub-condition is met, it is determined that the severe operating condition is met.

[0014] More preferably, The determination of the compressor frequency reduction range based on the current water temperature and the target water temperature of the unit includes: Calculate the absolute value of the difference between the current water temperature of the unit and the target water temperature of the unit, and record it as the unit water temperature deviation; When the water temperature deviation of the unit is less than or equal to the preset first temperature deviation threshold, the compressor frequency is reduced to the preset minimum operating frequency; When the water temperature deviation of the unit is greater than the first temperature deviation threshold, the compressor frequency is reduced by a preset frequency reduction value every set first time interval.

[0015] A second aspect of this invention discloses a collaborative temperature control method based on a collaborative temperature control device, comprising: The controller collects the temperature of the high-frequency filter capacitor and the temperature of each IGBT module in the inverter in real time, and determines in real time whether the temperature of the high-frequency filter capacitor is greater than the preset capacitor temperature threshold, and whether the temperature of each IGBT module is greater than the preset IGBT temperature threshold. When the temperature of the high-frequency filter capacitor is greater than or equal to a preset capacitor temperature threshold, and the temperature of each IGBT module is less than the preset IGBT temperature threshold, the controller outputs a first control signal through each control signal output terminal to control the multi-stage drive resistor module to increase the drive resistance connected to each IGBT module. When the temperature of the high-frequency filter capacitor is less than the capacitor temperature threshold, and the temperature of a certain IGBT module is greater than or equal to the IGBT temperature threshold, the controller outputs a second control signal through the control signal output terminal corresponding to the IGBT module to control the driving resistance of the multi-stage driving resistor module connected to the IGBT module to decrease. When both the temperature of the high-frequency filter capacitor and the temperature of the IGBT module are greater than or equal to the IGBT temperature threshold, the controller collects collaborative control-related data and determines a collaborative control adjustment strategy based on the collaborative control-related data.

[0016] More preferably, The collaborative control-related data includes the unit's current water temperature, ambient temperature, inverter input voltage, and DC bus current.

[0017] More preferably, The step of determining the collaborative control adjustment strategy based on the collaborative control-related data includes: Determine whether the collaborative control-related data meets the harsh operating conditions. If the conditions are met, the compressor frequency reduction range is determined based on the current water temperature of the unit and the target water temperature of the unit. The compressor frequency is reduced based on the compressor frequency reduction range until the temperature of the high-frequency filter capacitor is less than the capacitor temperature threshold and the temperature of the IGBT module is less than the IGBT temperature threshold. Every set second time interval, the compressor frequency is increased by a set frequency recovery value until the compressor frequency is equal to that before the reduction. If the conditions are not met, the switching frequency of the IGBT module is reduced based on the preset switching frequency reduction, until the temperature of the high-frequency filter capacitor is lower than the capacitor temperature threshold and the temperature of the IGBT module is lower than the IGBT temperature threshold.

[0018] More preferably, The severe operating conditions include a first severe operating condition sub-condition, a second severe operating condition sub-condition, and a third severe operating condition sub-condition; The first severe operating condition sub-condition refers to an ambient temperature greater than or equal to a preset ambient temperature threshold. The second adverse operating condition is that the inverter input voltage is less than or equal to a preset voltage threshold. The third severe operating condition is that the DC bus current is greater than or equal to a preset current threshold. When the first severe operating condition sub-condition, the second severe operating condition sub-condition, or the third severe operating condition sub-condition is met, it is determined that the severe operating condition is met.

[0019] More preferably, The determination of the compressor frequency reduction range based on the current water temperature and the target water temperature of the unit includes: Calculate the absolute value of the difference between the current water temperature of the unit and the target water temperature of the unit, and record it as the unit water temperature deviation; When the water temperature deviation of the unit is less than or equal to the preset first temperature deviation threshold, the compressor frequency is reduced to the preset minimum operating frequency; When the water temperature deviation of the unit is greater than the first temperature deviation threshold, the compressor frequency is reduced by a preset frequency reduction value every set first time interval.

[0020] More preferably, The frequency recovery amplitude is determined based on the unit water temperature deviation, including: When the water temperature deviation of the unit is less than or equal to the first temperature deviation threshold, the frequency recovery amplitude is a preset first recovery amplitude value; When the water temperature deviation of the unit is less than or equal to the preset second temperature deviation threshold and greater than the first temperature deviation threshold, the frequency recovery amplitude is the preset second recovery amplitude value. When the water temperature deviation of the unit is greater than the second temperature deviation threshold, the frequency recovery amplitude is the preset third recovery amplitude value; Wherein, the first temperature deviation threshold is less than the second temperature deviation threshold; the first recovery amplitude is less than the second recovery amplitude, and the second recovery amplitude is less than the third recovery amplitude.

[0021] A third aspect of the present invention discloses a hot water unit, wherein the hot water unit is configured with the cooperative temperature control device.

[0022] The fourth aspect of the present invention discloses a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the cooperative temperature control method.

[0023] The beneficial effects of this invention are compared with those of the prior art: This invention designs a variable resistor drive circuit to achieve dynamic resistance adjustment.

[0024] This invention proposes an adaptive collaborative temperature control device and method, which realizes collaborative temperature control of CBB capacitor and IGBT module, improving safety and adaptability.

[0025] This invention achieves precise cooling by collecting multiple parameters, dynamically adjusting the resistance, and reducing or adjusting the switching frequency. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the existing frequency converter circuit connection; Figure 2 This is a schematic diagram of the variable resistor drive circuit of the present invention; Figure 3 This is a schematic diagram of the device circuit of the present invention; Figure 4 This is a schematic diagram of the collaborative temperature control method of the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention.

[0028] The first aspect of this application discloses an IGBT and high-frequency filter capacitor coordinated temperature control device, including a controller, a multi-stage drive resistor module corresponding to each IGBT module in the strain gauge frequency converter, and an inverter, characterized in that: The number of the multi-stage drive resistor modules corresponds one-to-one with the IGBT modules in the frequency converter, and also one-to-one with the inverters.

[0029] The first signal input terminal of each of the multi-stage drive resistor modules is connected to the drive signal output terminal of the controller to receive the PWM signal from the controller; the second signal input terminal of the multi-stage drive resistor module is connected to the corresponding control signal output terminal of the controller; the signal output terminal of the multi-stage drive resistor module is connected to the gate of the upper bridge arm IGBT in the corresponding IGBT module and the input terminal of the corresponding inverter. like Figure 2As shown, each of the multi-stage drive resistor modules in this invention includes an excitation winding, a transistor, a first resistor, a second resistor, a first switch, and a second switch; wherein the excitation winding, the first switch, and the second switch constitute a relay.

[0030] One end of the excitation winding is connected to the collector of the transistor, and the other end is connected to the positive terminal of the DC power supply; the DC power supply can be selected by those skilled in the art according to the actual situation, and its preferred value range is 3.3~5V.

[0031] The emitter of the transistor is grounded, and its base is connected to the corresponding control signal output terminal of the controller. The transistor is switched on and off based on a received first or second control signal. The first control signal is high-level; the second control signal is low-level. The high-level signal is related to the selected controller model and may be 3.3V or 5V. Those skilled in the art should be able to select the appropriate controller based on the actual situation, which will not be elaborated here. The low-level signal is 0V.

[0032] The first end of the first resistor is connected to the drive signal output terminal of the controller; the second end is connected to the first end of the first switch. The first end of the second resistor is connected to the drive signal output terminal of the controller; the second end is connected to the first end of the second switch. The second terminals of both the first and second switches are connected to the signal output terminal of the multi-level drive resistor module. The first and second switches are normally open and normally closed switches, respectively. In a preferred embodiment of the invention, the first switch is a normally closed switch, the second switch is a normally open switch, and the second resistor is greater than the first resistor. The preferred values ​​of the first and second resistors are both 0.1~1Ω. When the base of the transistor receives the high level, the excitation winding is energized, the normally closed switch is open, the normally open switch is closed, and the second resistor is connected to the circuit as the drive resistor of the IGBT module corresponding to the multi-level drive resistor module. That is, the drive resistor of the IGBT module increases, thereby reducing dv / dt and reducing the high-frequency loss of the CBB capacitor, thus reducing the temperature of the CBB capacitor. When the base of the transistor receives the low level, the excitation winding is not energized, the normally closed switch is closed, the normally open switch is open, and the first resistor is connected to the circuit as the drive resistor of the IGBT module corresponding to the multi-level drive resistor module. That is, the drive resistor of the IGBT module decreases, thereby reducing switching losses and reducing the temperature of the corresponding IGBT module.

[0033] In a variable resistor drive circuit, the controller outputs high / low levels through each control signal output terminal to control the increase or decrease of the drive resistor connected to each IGBT module, which can adjust the resistance value of each IGBT module more quickly.

[0034] The output of the inverter is connected to the gate of the lower arm IGBT in the IGBT module. like Figure 2 As shown, this invention designs a variable resistor drive circuit based on a controller, a multi-stage drive resistor module, and an inverter to achieve dynamic resistance adjustment.

[0035] The circuit diagram of the device of the present invention is as follows: Figure 3 As shown, the present invention connects the variable resistor drive circuit into the frequency converter circuit, and collects the temperature of each IGBT module, the temperature of the CBB capacitor, the current water temperature of the unit, the ambient temperature, the input voltage of the frequency converter, and the DC bus current of the frequency converter in real time through the controller. like Figure 3 As shown, the present invention uses a current detection circuit composed of a sampling resistor and a differential amplifier circuit to collect the DC bus current of the frequency converter. Specifically, the current flows through the sampling resistor to form a voltage, which enters the controller through the differential amplifier circuit and is converted into the DC bus current of the frequency converter by the controller.

[0036] The controller collects the temperature of the high-frequency filter capacitor and the temperature of each IGBT module in the inverter in real time. When the temperature of the high-frequency filter capacitor is greater than or equal to a preset capacitor temperature threshold, and the temperature of each IGBT module is less than the preset IGBT temperature threshold, the controller outputs a first control signal through each control signal output terminal to control the increase of the drive resistance of each of the multi-stage drive resistor modules connected to each of the IGBT modules. The capacitor temperature threshold is set by those skilled in the art according to the actual situation, and will not be described in detail here.

[0037] When the temperature of the high-frequency filter capacitor is less than the capacitor temperature threshold, and the temperature of a certain IGBT module is greater than or equal to the IGBT temperature threshold, the controller outputs a second control signal through the control signal output terminal corresponding to the IGBT module, thereby controlling the multi-stage drive resistor module corresponding to the IGBT module to reduce the drive resistance connected to the IGBT module; the IGBT temperature threshold is set by those skilled in the art according to the actual situation, and will not be elaborated here.

[0038] When both the high-frequency filter capacitor temperature and the IGBT module temperature are greater than or equal to the IGBT temperature threshold, the controller collects collaborative control-related data and determines a collaborative control adjustment strategy based on this data. For example... Figure 3As shown, the collaborative control related data includes the unit's current water temperature, ambient temperature, inverter input voltage, and inverter DC bus current.

[0039] This invention collects multiple parameters as the basis for subsequent frequency reduction or switching frequency adjustment, thereby achieving precise cooling.

[0040] The step of determining the collaborative control adjustment strategy based on the collaborative control-related data includes: Determine whether the collaborative control-related data meets the harsh operating conditions. The severe operating conditions include a first severe operating condition sub-condition, a second severe operating condition sub-condition, and a third severe operating condition sub-condition; The first severe operating condition refers to an ambient temperature greater than or equal to a preset ambient temperature threshold; the ambient temperature threshold can be selected by those skilled in the art based on the actual situation, and its preferred value is 50℃.

[0041] The second adverse operating condition is that the input voltage of the frequency converter is less than or equal to a preset voltage threshold. The voltage threshold can be selected by those skilled in the art based on the actual situation, and its preferred value is 85% of the rated input voltage of the transformer.

[0042] The third severe operating condition is that the DC bus current is greater than or equal to a preset current threshold. The current threshold can be selected by those skilled in the art based on the actual situation, and its preferred value is 120% of the rated bus current of the transformer.

[0043] When the first severe operating condition sub-condition, the second severe operating condition sub-condition, or the third severe operating condition sub-condition is met, it is determined that the severe operating condition is met.

[0044] This invention makes the judgment of severe operating conditions more comprehensive by setting three sub-conditions for severe operating conditions.

[0045] If satisfied, the compressor frequency reduction magnitude is determined based on the current water temperature and the target water temperature of the unit. The compressor frequency is then reduced based on this reduction magnitude until the temperature of the high-frequency filter capacitor is lower than the capacitor temperature threshold, and the temperature of the IGBT module is lower than the IGBT temperature threshold. At this point, the compressor frequency is increased by a set frequency recovery value every set second time interval until the compressor frequency is greater than or equal to the compressor frequency before the reduction. The target water temperature is set by the user. The preferred value for the second time interval is 1 minute. Determining the compressor frequency reduction magnitude based on the current water temperature and the target water temperature includes: Calculate the absolute value of the difference between the current water temperature of the unit and the target water temperature of the unit, and record it as the unit water temperature deviation; When the water temperature deviation of the unit is less than or equal to a preset first temperature deviation threshold, the compressor frequency is reduced to a preset minimum operating frequency; the first temperature deviation threshold can be set by those skilled in the art according to the actual situation, and its preferred value is 5℃; When the water temperature deviation of the unit exceeds the first temperature deviation threshold, the compressor frequency is reduced by a preset frequency reduction value every set first time interval. The first time interval can be set by those skilled in the art according to actual conditions, and its preferred value is 1 minute. The frequency reduction value can be set by those skilled in the art according to actual conditions, and its preferred value is 5Hz.

[0046] This invention determines the compressor frequency reduction range based on the current water temperature and the target water temperature of the unit. It can ensure that the water temperature of the unit meets the operating requirements of the unit (as close as possible to the target water temperature of the unit) while allowing the IGBT and CBB capacitors to cool down at the fastest speed.

[0047] The frequency recovery amplitude is determined based on the unit water temperature deviation, including: When the water temperature deviation of the unit is less than or equal to the first temperature deviation threshold, the frequency rise amplitude is a preset first rise amplitude value; the first rise amplitude value can be set by those skilled in the art according to the actual situation, and its preferred value is 1Hz; When the water temperature deviation of the unit is less than or equal to a preset second temperature deviation threshold and greater than the first temperature deviation threshold, the frequency rise amplitude is a preset second rise amplitude value; the second temperature deviation threshold can be set by those skilled in the art according to actual conditions, and its preferred value is 10℃; the second rise amplitude value can be set by those skilled in the art according to actual conditions, and its preferred value is 5Hz; When the water temperature deviation of the unit is greater than the second temperature deviation threshold, the frequency rise amplitude is a preset third rise amplitude value; the third rise amplitude value can be set by those skilled in the art according to the actual situation, and its preferred value is 10Hz; Among them, the first temperature deviation threshold is less than the second temperature deviation threshold; the first rise value is less than the second rise value, and the second rise value is less than the third rise value.

[0048] If the conditions are not met, the switching frequency of the IGBT module is reduced based on a preset switching frequency reduction margin until the temperature of the high-frequency filter capacitor is lower than the capacitor temperature threshold and the temperature of the IGBT module is lower than the IGBT temperature threshold. The preset switching frequency reduction margin can be set by those skilled in the art according to actual conditions, and its preferred value is 1 / 3 of the current switching frequency of the IGBT module, such as reducing it from 15kHz to 10kHz. This invention determines whether the current operating condition is severe based on collaborative control data, and sets different adjustment strategies according to different operating conditions. This avoids the risk of slow control speed or unit crash due to frequency reduction, while selecting the best cooling solution.

[0049] This invention proposes an adaptive collaborative temperature control device that enables collaborative temperature control of the CBB capacitor and IGBT module, thereby improving the safety and adaptability of the frequency converter.

[0050] This invention achieves precise cooling by collecting multiple parameters, dynamically adjusting the resistance, and reducing or adjusting the switching frequency.

[0051] The second aspect of this application discloses a collaborative temperature control method based on the aforementioned collaborative temperature control device, such as... Figure 4 As shown, it includes: The controller collects the temperature of the high-frequency filter capacitor and the temperature of each IGBT module in the inverter in real time, and determines in real time whether the temperature of the high-frequency filter capacitor is greater than the preset capacitor temperature threshold and whether the temperature of each IGBT module is greater than the preset IGBT temperature threshold. When the temperature of the high-frequency filter capacitor is greater than or equal to a preset capacitor temperature threshold, and the temperature of each IGBT module is less than a preset IGBT temperature threshold, the controller outputs a first control signal through each control signal output terminal to control the multi-stage drive resistor module to increase the drive resistance connected to each IGBT module; the capacitor temperature threshold and IGBT temperature threshold are set by those skilled in the art according to the actual situation, and will not be described in detail here.

[0052] When the temperature of the high-frequency filter capacitor is less than the capacitor temperature threshold, and the temperature of a certain IGBT module is greater than or equal to the IGBT temperature threshold, the controller outputs a second control signal through the control signal output terminal corresponding to the IGBT module to control the driving resistance of the multi-stage driving resistor module connected to the IGBT module to decrease. When both the temperature of the high-frequency filter capacitor and the temperature of the IGBT module are greater than or equal to the IGBT temperature threshold, the controller collects collaborative control-related data and determines a collaborative control adjustment strategy based on the collaborative control-related data. The collaborative control-related data includes the unit's current water temperature, ambient temperature, inverter input voltage, and inverter DC bus current.

[0053] This invention collects multiple parameters as the basis for subsequent frequency reduction or switching frequency adjustment, thereby achieving precise cooling.

[0054] The step of determining the collaborative control adjustment strategy based on the collaborative control-related data includes: Determine whether the collaborative control-related data meets the harsh operating conditions. The severe operating conditions include a first severe operating condition sub-condition, a second severe operating condition sub-condition, and a third severe operating condition sub-condition; The first severe operating condition refers to an ambient temperature greater than or equal to a preset ambient temperature threshold; the ambient temperature threshold can be selected by those skilled in the art based on the actual situation, and its preferred value is 50℃.

[0055] The second adverse operating condition is that the input voltage of the frequency converter is less than or equal to a preset voltage threshold. The voltage threshold can be selected by those skilled in the art based on the actual situation, and its preferred value is 85% of the rated input voltage of the transformer.

[0056] The third severe operating condition is that the DC bus current is greater than or equal to a preset current threshold. The current threshold can be selected by those skilled in the art based on the actual situation, and its preferred value is 120% of the rated DC bus current of the transformer.

[0057] When the first severe operating condition sub-condition, the second severe operating condition sub-condition, or the third severe operating condition sub-condition is met, it is determined that the severe operating condition is met.

[0058] This invention makes the judgment of severe operating conditions more comprehensive by setting three sub-conditions for severe operating conditions.

[0059] If the conditions are met, the compressor frequency reduction range is determined based on the current water temperature and the target water temperature of the unit. The compressor frequency is reduced based on the compressor frequency reduction range until the temperature of the high-frequency filter capacitor is lower than the capacitor temperature threshold and the temperature of the IGBT module is lower than the IGBT temperature threshold. At this point, the compressor frequency is increased by a set frequency recovery value every set second time interval until the compressor frequency is greater than or equal to the compressor frequency before the reduction. The target water temperature of the unit is set by the user. The second time interval can be set by those skilled in the art according to the actual situation, and its preferred value is 1 minute. The determination of the compressor frequency reduction range based on the current water temperature and the target water temperature of the unit includes: Calculate the absolute value of the difference between the current water temperature of the unit and the target water temperature of the unit, and record it as the unit water temperature deviation; When the water temperature deviation of the unit is less than or equal to a preset first temperature deviation threshold, the compressor frequency is reduced to a preset minimum operating frequency; the first temperature deviation threshold can be set by those skilled in the art according to the actual situation, and its preferred value is 5℃; When the water temperature deviation of the unit exceeds the first temperature deviation threshold, the compressor frequency is reduced by a preset frequency reduction value every set first time interval. The first time interval can be set by those skilled in the art according to actual conditions, and its preferred value is 1 minute. The frequency reduction value can also be set by those skilled in the art according to actual conditions, and its preferred value is 5Hz.

[0060] This invention determines the compressor frequency reduction range based on the current water temperature and the target water temperature of the unit, which can ensure that the water temperature of the unit meets the operating requirements of the unit while allowing the IGBT and CBB capacitors to cool down at the fastest speed.

[0061] The frequency recovery amplitude is determined based on the unit water temperature deviation, including: When the water temperature deviation of the unit is less than or equal to the first temperature deviation threshold, the frequency rise amplitude is a preset first rise amplitude value; the first rise amplitude value can be set by those skilled in the art according to the actual situation, and its preferred value is 1Hz; When the water temperature deviation of the unit is less than or equal to a preset second temperature deviation threshold and greater than the first temperature deviation threshold, the frequency rise amplitude is a preset second rise amplitude value; the second temperature deviation threshold can be set by those skilled in the art according to actual conditions, and its preferred value is 10℃; the second rise amplitude value can be set by those skilled in the art according to actual conditions, and its preferred value is 5Hz; When the water temperature deviation of the unit is greater than the second temperature deviation threshold, the frequency rise amplitude is a preset third rise amplitude value; the third rise amplitude value can be set by those skilled in the art according to the actual situation, and its preferred value is 10Hz; Among them, the first temperature deviation threshold is less than the second temperature deviation threshold; the first rise value is less than the second rise value, and the second rise value is less than the third rise value.

[0062] Determining the frequency recovery amplitude based on the unit's water temperature deviation enables the compressor frequency recovery to balance the unit's operating conditions and the need for stable unit operation.

[0063] If the conditions are not met, the switching frequency of the IGBT module is reduced based on a preset switching frequency reduction margin until the temperature of the high-frequency filter capacitor is lower than the capacitor temperature threshold and the temperature of the IGBT module is lower than the IGBT temperature threshold. The preset switching frequency reduction margin can be set by those skilled in the art according to actual conditions, and its preferred value is 1 / 3 of the current switching frequency of the IGBT module, such as reducing it from 15kHz to 10kHz.

[0064] This invention determines whether the current operating condition is severe based on collaborative control data, and sets different adjustment strategies according to different operating conditions. This avoids the risk of slow control speed or unit crash due to frequency reduction, while selecting the best cooling solution.

[0065] This invention proposes an adaptive collaborative temperature control method that achieves coordinated temperature control of the CBB capacitor and IGBT module, improving safety and compatibility. This invention achieves precise cooling by collecting multiple parameters, dynamically adjusting the resistance, and reducing or adjusting the switching frequency.

[0066] A third aspect of this application discloses a hot water unit equipped with the aforementioned coordinated temperature control device.

[0067] This invention can be well integrated into the aforementioned collaborative temperature control device, enabling collaborative temperature control of the CBB capacitor and IGBT module, improving the compatibility between the frequency converter and the hot water unit, as well as the overall safety of the hot water unit.

[0068] The fourth aspect of this application discloses a computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the cooperative temperature control method.

[0069] This invention can be applied to any computer program and has a wide range of applications.

[0070] Example 1 A temperature control device that combines IGBTs and high-frequency filter capacitors. For example... Figure 2The diagram shows a variable resistor drive circuit of the present invention, which includes a controller and three multi-stage drive resistor modules. Hereinafter, the multi-stage drive resistor module connected to the IGBT1 module will be referred to as the first multi-stage drive resistor module, the multi-stage drive resistor module connected to the IGBT2 module will be referred to as the second multi-stage drive resistor module, and the multi-stage drive resistor module connected to the IGBT3 module will be referred to as the third multi-stage drive resistor module.

[0071] Each of the multi-stage drive resistor modules includes an excitation winding, a transistor, a first resistor, a second resistor, a first switch, and a second switch; One end of the excitation winding is connected to the collector of the transistor, and the other end is connected to the positive terminal of the DC power supply; the DC power supply can be selected by those skilled in the art according to the actual situation, and its preferred value range is 3.3~5V.

[0072] The emitter of the transistor is grounded, and its base is connected to the corresponding control signal output terminal of the controller. The transistor is switched on and off based on a received first or second control signal. The first control signal is high-level; the second control signal is low-level. The high-level signal is related to the selected controller model and may be 3.3V or 5V. Those skilled in the art should be able to select the appropriate controller based on the actual situation, which will not be elaborated here. The low-level signal is 0V.

[0073] The first end of the first resistor is connected to the drive signal output terminal of the controller; the second end is connected to the first end of the first switch. The first end of the second resistor is connected to the drive signal output terminal of the controller; the second end is connected to the first end of the second switch. The second terminals of both the first switch and the second switch are connected to the signal output terminal of the multi-stage driving resistor module. The first switch and the second switch are normally open and normally closed switches, respectively. In a preferred embodiment of the invention, the first switch is a normally closed switch, the second switch is a normally open switch, and the second resistor is greater than the first resistor. The preferred values ​​of the first resistor and the second resistor are both 0.1~1Ω. When the base of the transistor receives the high level, the excitation winding is energized, the normally closed switch is open, the normally open switch is closed, and the second resistor is connected to the circuit as the driving resistor of the IGBT module corresponding to the multi-stage driving resistor module; that is, the driving resistor of the IGBT module increases. When the base of the transistor receives the low level, the excitation winding is not energized, the normally closed switch is closed, the normally open switch is open, and the first resistor is connected to the circuit as the driving resistor of the IGBT module corresponding to the multi-stage driving resistor module; that is, the driving resistor of the IGBT module decreases.

[0074] The circuit diagram of the device of the present invention is as follows: Figure 3 As shown, the present invention connects the variable resistor drive circuit into the frequency converter circuit, and collects the temperature of each IGBT module, the temperature of the CBB capacitor, the current water temperature of the unit, the ambient temperature, the input voltage of the frequency converter, and the DC bus current of the frequency converter in real time through the controller. like Figure 3 As shown, the present invention uses a current detection circuit composed of a sampling resistor and a differential amplifier circuit to collect the DC bus current of the frequency converter. Specifically, the current flows through the sampling resistor to form a voltage, which enters the controller through the differential amplifier circuit and is converted into the DC bus current of the frequency converter by the controller.

[0075] The controller collects key parameters of the unit in real time, including: the temperature of each IGBT module (T1), the temperature of the high-frequency filter capacitor (hereinafter referred to as CBB capacitor temperature) (T2), and collaborative control related data. The collaborative control related data includes the unit's target water temperature (T3), the unit's current water temperature (T4), the ambient temperature (T5), the inverter input voltage (U), and the inverter's DC bus current (I). Based on the collected key parameters, the controller determines whether to implement a single-component high-temperature control strategy or a dual-component high-temperature control strategy. Single-component high-temperature control strategies include: When only the CBB capacitor is at a high temperature (T2 ≥ preset threshold T2_max, and T1 < T1_max): increase the driving resistance Rg of the IGBT module to reduce the voltage change rate and decrease the high-frequency loss of the CBB capacitor, thereby reducing T2 temperature. Here, T1_max is the preset IGBT temperature threshold; T2_max is the preset capacitor temperature threshold; both T1_max and T2_max can be set by those skilled in the art according to actual conditions, and will not be elaborated here.

[0076] The logic to achieve the above functions is as follows: the controller sends a high-level signal to... Figure 2 In the first, second, and third multi-stage driving resistor modules shown, the first transistor Q1, the second transistor Q2, and the third transistor Q3 are all turned on. The excitation windings in the first relay K1, the second relay K2, and the third relay K3 are all energized. The normally closed switch connected to the first resistor in each relay is opened, and the normally open switch connected to the second resistor is closed. The driving resistors originally connected to the circuit are all switched off from the first resistor (preferably, the resistance values ​​of the first resistors in each multi-stage driving resistor module are equal). Figure 2 Each of the first resistors, including the first resistor Rg1 in the multi-stage drive resistor module corresponding to the IGBT1 module, the first resistor Rg1' in the multi-stage drive resistor module corresponding to the IGBT2 module, and the first resistor Rg1' in the multi-stage drive resistor module corresponding to the IGBT3 module, is changed to a second resistor (preferably, the second resistor values ​​of each multi-stage drive resistor module are equal). Figure 2The second resistors include the second resistor Rg2 in the multi-stage drive resistor module corresponding to the IGBT1 module, the second resistor Rg2' in the multi-stage drive resistor module corresponding to the IGBT2 module, and the second resistor Rg2" in the multi-stage drive resistor module corresponding to the IGBT3 module. Because the resistance value of each second resistor is greater than that of each first resistor, this achieves the purpose of reducing the voltage change rate and reducing the high-frequency loss of the CBB capacitor. The preferred value range for Rg1, Rg2, Rg1', Rg2', Rg1" and Rg2" is 0.1~1Ω. When only the IGBT module is at high temperature (T1≥ preset threshold T1_max, and T2<T2_max): reduce the driving resistance Rg of the IGBT module to reduce switching losses and achieve T1 cooling.

[0077] The logic for achieving the above functions is as follows: Overheating of a single module, such as Figure 2 As shown, for example, when the IGBT1 module is detected to be overheated, the controller sends a low level to the first transistor Q1 in the first multi-stage drive resistor module, so that the excitation winding in the first relay K1 is de-energized, and the second resistor Rg2 in the multi-stage drive resistor module corresponding to the IGBT1 module is disconnected, and Rg1 in the first multi-stage drive resistor module is connected as the drive resistor of the IGBT1 module.

[0078] Multiple modules overheated, such as Figure 2 As shown, for example, when it is detected that IGBT1, IGBT2, and IGBT3 modules are all at high temperatures, the controller sends a low level to the first transistor Q1, the second transistor Q2, and the third transistor Q3 in the first multi-level drive resistor module, the second multi-level drive resistor module, and the third multi-level drive resistor module, so that the excitation windings in the first relay K1, the second relay K2, and the third relay K3 are de-energized. Rg1 in the first multi-level drive resistor module is used as the drive resistor for IGBT1 module, Rg1' in the second multi-level drive resistor module is used as the drive resistor for IGBT2 module, and Rg1" in the third multi-level drive resistor module is used as the drive resistor for IGBT3 module.

[0079] The dual-component high-temperature collaborative control strategy includes: When T1≥T1_max and T2≥T2_max, the controller first determines whether the unit is in a severe operating condition based on the ambient temperature T5, input voltage U, and unit current I, and then executes control according to the situation.

[0080] The preset criteria for determining whether a generator unit is in a severe operating condition include: T5≥T5_max (e.g., 50℃) or U≤U_min (e.g., 85% of rated voltage) or I≥I_max (e.g., 120% of rated DC bus current of transformer). Where T5_max is the preset ambient temperature threshold; U_min is the preset voltage threshold; and I_max is the preset current threshold. After determining whether the unit is in a severe operating condition, control measures are executed according to the specific circumstances: For severe operating conditions: calculate the temperature difference between the current water temperature and the target water temperature ΔT = |T4 - T3|, where ΔT represents the unit water temperature deviation; The frequency reduction magnitude is dynamically determined based on ΔT, for example: If ΔT ≤ ΔT_min (e.g., 5℃, which is close to the target water temperature): directly reduce the compressor frequency of the unit to the lowest operating frequency f_min (e.g., 30Hz) to reduce the load and achieve the purpose of rapid cooling of components; where ΔT_min represents the first temperature deviation threshold.

[0081] If ΔT > ΔT_min (i.e., load needs to be maintained): slowly reduce the frequency at a preset rate, that is, every set first time interval, reduce the compressor frequency by a preset frequency reduction value (e.g., 5Hz per minute) to avoid a sudden drop in load; When T1 < T1_max and T2 < T2_max, combined with the ΔT recovery frequency (a large ΔT results in rapid recovery, a small ΔT results in slow recovery), that is, the compressor frequency increases by a set frequency recovery amplitude every set second time interval until the compressor frequency is equal to its previous value, including: When the water temperature deviation of the unit is less than or equal to the first temperature deviation threshold, the frequency rise amplitude is a preset first rise amplitude value; the first rise amplitude value can be set by those skilled in the art according to the actual situation, and its preferred value is 1Hz; When the water temperature deviation of the unit is less than or equal to a preset second temperature deviation threshold and greater than the first temperature deviation threshold, the frequency rise amplitude is a preset second rise amplitude value; the second temperature deviation threshold can be set by those skilled in the art according to actual conditions, and its preferred value is 10℃; the second rise amplitude value can be set by those skilled in the art according to actual conditions, and its preferred value is 5Hz; When the water temperature deviation of the unit is greater than the second temperature deviation threshold, the frequency rise amplitude is a preset third rise amplitude value; the third rise amplitude value can be set by those skilled in the art according to the actual situation, and its preferred value is 10Hz; Among them, the first temperature deviation threshold is less than the second temperature deviation threshold; the first rise value is less than the second rise value, and the second rise value is less than the third rise value.

[0082] Determining the frequency recovery amplitude based on the unit's water temperature deviation enables the compressor frequency recovery to balance the unit's operating conditions and the need for stable unit operation.

[0083] For non-severe operating conditions: reduce the switching frequency f_switch of the IGBT module (e.g., from 15kHz to 10kHz), while reducing IGBT switching losses and high-frequency stress on the CBB capacitor to achieve synchronous cooling of T1 and T2; (avoiding the risk of slower control speed and unit shutdown caused by reducing the switching frequency under severe operating conditions).

[0084] The summary is as follows: 1. High temperature control of a single component (only one component overheats) is shown in Table 1.

[0085] Table 1 High-Temperature Control Logic Table for Single Components of the Invention

[0086] For dual-component high-temperature coordinated control (T1 ≥ T1_max and T2 ≥ T2_max), first determine the operating conditions: As shown in Table 2, if the harsh operating conditions are met (T5 ≥ T5_max (e.g., 50℃) or U ≤ U_min (e.g., 85% of rated voltage) or I ≥ I_max), then the harsh operating condition control strategy is executed; otherwise, the non-harsh operating condition strategy is entered.

[0087] Table 2. High Temperature Collaborative Control Logic Table for Dual Components

[0088] The above embodiments are only for illustrating the technical concept and features of the present invention. The selected hardware modules are merely one implementation method under the technical concept of the present invention. Any modifications to hardware with the same function and purpose under this technical concept should be covered within the protection scope of the present invention. For example: The relay's function is to control the circuit's on / off state via electrical signals. In this invention, solid-state relays, contactors, or other electromagnetic switches can also be used to replace the relay in this invention.

[0089] The current detection circuit composed of the sampling resistor and differential amplifier circuit in this invention is used to collect current data. In this invention, an ammeter or other current detection circuits can also be used to replace the current detection circuit in this invention.

[0090] This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of this disclosure.

[0091] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination of the foregoing. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0092] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0093] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A temperature control device for IGBTs and high-frequency filter capacitors, comprising a controller, a multi-stage drive resistor module corresponding to each IGBT module in a strain gauge frequency converter, and an inverter, characterized in that: The first signal input terminal of each of the multi-stage drive resistor modules is connected to the drive signal output terminal of the controller; the second signal input terminal is connected to the corresponding control signal output terminal of the controller; the signal output terminal of the multi-stage drive resistor module is connected to the gate of the upper bridge arm IGBT in the corresponding IGBT module, and the input terminal of the corresponding inverter. The output of the inverter is connected to the gate of the lower arm IGBT in the IGBT module. The controller collects the temperatures of the high-frequency filter capacitor and each IGBT module in the inverter in real time. When the temperature of the high-frequency filter capacitor is greater than or equal to a preset capacitor temperature threshold, and the temperatures of each IGBT module are less than a preset IGBT temperature threshold, the controller outputs a first control signal through each control signal output terminal to increase the drive resistance of each multi-stage drive resistor module connected to each IGBT module. When the temperature of the high-frequency filter capacitor is less than the capacitor temperature threshold, and the temperature of a certain IGBT module is greater than or equal to the IGBT temperature threshold, the controller outputs a second control signal through the control signal output terminal corresponding to that IGBT module to decrease the drive resistance of the multi-stage drive resistor module connected to that IGBT module. When both the temperature of the high-frequency filter capacitor and the temperature of the IGBT module are greater than or equal to the IGBT temperature threshold, the controller collects collaborative control related data and determines a collaborative control adjustment strategy based on the collaborative control related data.

2. The collaborative temperature control device according to claim 1, characterized in that: Each of the multi-stage drive resistor modules includes an excitation winding, a transistor, a first resistor, a second resistor, a first switch, and a second switch; One end of the excitation winding is connected to the collector of the transistor, and the other end is connected to the positive terminal of the DC power supply. The emitter of the transistor is grounded, and the base is connected to the corresponding control signal output terminal of the controller. The transistor is turned on and off based on the received first control signal or second control signal; the first control signal is high level; the second control signal is low level. The first end of the first resistor is connected to the drive signal output terminal of the controller; the second end is connected to the first end of the first switch. The first end of the second resistor is connected to the drive signal output terminal of the controller; the second end is connected to the first end of the second switch. The second terminals of the first switch and the second switch are both connected to the signal output terminal of the multi-stage drive resistor module; the first switch and the second switch are normally open and normally closed switches, respectively; when the base of the transistor receives the high level, the excitation winding is energized, the normally closed switch is open, and the normally open switch is closed; when the base of the transistor receives the low level, the excitation winding is not energized, the normally closed switch is closed, and the normally open switch is open.

3. The collaborative temperature control device according to claim 1, characterized in that: In the controller, the collaborative control-related data includes the unit's current water temperature, ambient temperature, inverter input voltage, and DC bus current.

4. The synergistic temperature control device according to claim 1 or 3, characterized in that: In the controller, determining the collaborative control adjustment strategy based on the collaborative control-related data includes: Determine whether the collaborative control-related data meets the harsh operating conditions. If the conditions are met, the compressor frequency reduction range is determined based on the current water temperature of the unit and the target water temperature of the unit. The compressor frequency is reduced based on the compressor frequency reduction range until the temperature of the high-frequency filter capacitor is less than the capacitor temperature threshold and the temperature of the IGBT module is less than the IGBT temperature threshold. Every set second time interval, the compressor frequency is increased by a set frequency recovery value until the compressor frequency is equal to that before the reduction. If the conditions are not met, the switching frequency of the IGBT module is reduced based on the preset switching frequency reduction, until the temperature of the high-frequency filter capacitor is lower than the capacitor temperature threshold and the temperature of the IGBT module is lower than the IGBT temperature threshold.

5. The collaborative temperature control device according to claim 4, characterized in that: The severe operating conditions include a first severe operating condition sub-condition, a second severe operating condition sub-condition, and a third severe operating condition sub-condition; The first severe operating condition sub-condition refers to the ambient temperature being greater than or equal to a preset ambient temperature threshold. The second adverse operating condition is that the inverter input voltage is less than or equal to a preset voltage threshold. The third severe operating condition is that the DC bus current is greater than or equal to a preset current threshold. When the first severe operating condition sub-condition, the second severe operating condition sub-condition, or the third severe operating condition sub-condition is met, it is determined that the severe operating condition is met.

6. The collaborative temperature control device according to claim 4, characterized in that: The determination of the compressor frequency reduction range based on the current water temperature and the target water temperature of the unit includes: Calculate the absolute value of the difference between the current water temperature of the unit and the target water temperature of the unit, and record it as the unit water temperature deviation; When the water temperature deviation of the unit is less than or equal to the preset first temperature deviation threshold, the compressor frequency is reduced to the preset minimum operating frequency; When the water temperature deviation of the unit is greater than the first temperature deviation threshold, the compressor frequency is reduced by a preset frequency reduction value every set first time interval.

7. A method for coordinated temperature control using the coordinated temperature control device according to any one of claims 1-6, characterized in that: The controller collects the temperature of the high-frequency filter capacitor and the temperature of each IGBT module in the inverter in real time, and determines in real time whether the temperature of the high-frequency filter capacitor is greater than the preset capacitor temperature threshold, and whether the temperature of each IGBT module is greater than the preset IGBT temperature threshold. When the temperature of the high-frequency filter capacitor is greater than or equal to a preset capacitor temperature threshold, and the temperature of each IGBT module is less than the preset IGBT temperature threshold, the controller outputs a first control signal through each control signal output terminal to control the drive resistance of the multi-stage drive resistor module connected to each IGBT module to increase. When the temperature of the high-frequency filter capacitor is less than the capacitor temperature threshold, and the temperature of a certain IGBT module is greater than or equal to the IGBT temperature threshold, the controller outputs a second control signal through the control signal output terminal corresponding to the IGBT module to control the driving resistance of the multi-stage driving resistor module connected to the IGBT module to decrease. When both the temperature of the high-frequency filter capacitor and the temperature of the IGBT module are greater than or equal to the temperature threshold of the IGBT, the controller collects collaborative control-related data and determines a collaborative control adjustment strategy based on the collaborative control-related data.

8. The synergistic temperature control method according to claim 7, characterized in that: The collaborative control-related data includes the unit's current water temperature, ambient temperature, inverter input voltage, and DC bus current.

9. The synergistic temperature control method according to claim 7 or 8, characterized in that: The step of determining the collaborative control adjustment strategy based on the collaborative control-related data includes: Determine whether the collaborative control-related data meets the harsh operating conditions. If the conditions are met, the compressor frequency reduction range is determined based on the current water temperature of the unit and the target water temperature of the unit. The compressor frequency is reduced based on the compressor frequency reduction range until the temperature of the high-frequency filter capacitor is less than the capacitor temperature threshold and the temperature of the IGBT module is less than the IGBT temperature threshold. Every set second time interval, the compressor frequency is increased by a set frequency recovery value until the compressor frequency is equal to that before the reduction. If the conditions are not met, the switching frequency of the IGBT module is reduced based on the preset switching frequency reduction, until the temperature of the high-frequency filter capacitor is lower than the capacitor temperature threshold and the temperature of the IGBT module is lower than the IGBT temperature threshold.

10. The synergistic temperature control method according to claim 9, characterized in that: The severe operating conditions include a first severe operating condition sub-condition, a second severe operating condition sub-condition, and a third severe operating condition sub-condition; The first severe operating condition sub-condition refers to the ambient temperature being greater than or equal to a preset ambient temperature threshold. The second adverse operating condition is that the inverter input voltage is less than or equal to a preset voltage threshold. The third severe operating condition is that the DC bus current is greater than or equal to a preset current threshold. When the first severe operating condition sub-condition, the second severe operating condition sub-condition, or the third severe operating condition sub-condition is met, it is determined that the severe operating condition is met.

11. The synergistic temperature control method according to claim 9, characterized in that: The determination of the compressor frequency reduction range based on the current water temperature and the target water temperature of the unit includes: Calculate the absolute value of the difference between the current water temperature of the unit and the target water temperature of the unit, and record it as the unit water temperature deviation; When the water temperature deviation of the unit is less than or equal to the preset first temperature deviation threshold, the compressor frequency is reduced to the preset minimum operating frequency; When the water temperature deviation of the unit is greater than the first temperature deviation threshold, the compressor frequency is reduced by a preset frequency reduction value every set first time interval.

12. The synergistic temperature control method according to claim 7, 9, or 11, characterized in that: The frequency recovery amplitude is determined based on the unit water temperature deviation, including: When the water temperature deviation of the unit is less than or equal to the first temperature deviation threshold, the frequency recovery amplitude is a preset first recovery amplitude value; When the water temperature deviation of the unit is less than or equal to the preset second temperature deviation threshold and greater than the first temperature deviation threshold, the frequency recovery amplitude is the preset second recovery amplitude value. When the water temperature deviation of the unit is greater than the second temperature deviation threshold, the frequency recovery amplitude is the preset third recovery amplitude value; Wherein, the first temperature deviation threshold is less than the second temperature deviation threshold; the first recovery amplitude is less than the second recovery amplitude, and the second recovery amplitude is less than the third recovery amplitude.

13. A hot water unit, characterized in that: The hot water unit is equipped with the collaborative temperature control device as described in any one of claims 1-6.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the collaborative temperature control method according to any one of claims 7-12.

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