Voltage regulation circuit and temperature control device

Abstract

The utility model discloses a voltage regulation circuit and a temperature control device, the temperature control device comprises a three-phase input end, a direct current input end and a main control circuit, the voltage regulation circuit comprises a switch circuit, a controlled end of the switch circuit is electrically connected with an output end of the main control circuit, an input end is electrically connected with the direct current input end, and the main control circuit is electrically connected with the three-phase input end. The output end is electrically connected with the grounding end; one end of the driving circuit group is electrically connected with the switching circuit, and the other end of the driving circuit group is electrically connected with the direct current input end; the controlled end of the silicon controlled circuit group is electrically connected with the driving circuit group, and the input end of the silicon controlled circuit group is electrically connected with the three-phase input end; wherein the main control circuit is used for outputting a control signal so as to control the opening degree of the switching circuit; and the driving circuit group is used for driving the silicon-controlled circuit group to work according to the opening degree of the switching circuit, so that the silicon-controlled circuit group controls the output of the three-phase voltage. The utility model aims to improve the stability of the temperature control device for controlling the three-phase alternating current.

Description

Technical Field

[0001] The utility model relates to the technical field of voltage control, in particular to a voltage regulating circuit and a temperature control device. Background Art

[0002] In the prior art, the power supply used by many industrial heating devices is usually three-phase alternating current. Heating devices using three-phase alternating current as a power source have many advantages such as high power, high efficiency, stable operation and easy control. However, there are also technical problems of difficult control in practical applications. When three-phase alternating current is used to power the heating device, the three-phase alternating current power supply may be abnormal due to the instability of the control circuit, resulting in safety hazards in the heating device, and thus the heating device cannot be effectively kept in a constant temperature control state. Utility Model Content

[0003] The main purpose of the utility model is to provide a voltage regulating circuit, aiming to improve the stability of a temperature control device for controlling three-phase alternating current.

[0004] To achieve the above object, the voltage regulating circuit proposed in the utility model is applied to a temperature control device, the temperature control device includes a three-phase input terminal, a DC input terminal and a main control circuit, and the voltage regulating circuit includes:

[0005] a switch circuit, wherein a controlled end of the switch circuit is electrically connected to an output end of the main control circuit, an input end of the switch circuit is electrically connected to the DC input end, and an output end of the switch circuit is electrically connected to a ground end;

[0006] A driving circuit group, one end of which is electrically connected to the switch circuit, and the other end of which is electrically connected to the DC input terminal;

[0007] A thyristor circuit group, wherein a controlled end of the thyristor circuit group is electrically connected to the driving circuit group, and an input end of the thyristor circuit group is electrically connected to the three-phase input end;

[0008] Among them, the main control circuit is used to output a control signal to control the opening degree of the switching circuit; the driving circuit group is used to drive the thyristor circuit group to work according to the opening degree of the switching circuit, so that the thyristor circuit group controls the output of the three-phase voltage.

[0009] Preferably, the switch circuit comprises a first resistor, a second resistor, a third resistor, and a first switch tube;

[0010] Among them, the first end of the first resistor is electrically connected to the main control circuit, the second end of the first resistor is electrically connected to the first end of the second resistor and the controlled end of the first switch tube; the second end of the second resistor is electrically connected to the output end and the ground end of the first switch tube; the first end of the third resistor is electrically connected to the input end of the first switch tube, and the second end of the third resistor is electrically connected to the drive circuit group.

[0011] Preferably, the driving circuit group includes:

[0012] a first drive circuit, one end of which is electrically connected to the DC input end; the first drive circuit is used to drive the thyristor circuit group to work according to the opening degree of the switch circuit;

[0013] A second driving circuit, one end of which is electrically connected to the first driving circuit; the second driving circuit is used to drive the thyristor circuit group to work according to the opening degree of the switch circuit.

[0014] Preferably, the thyristor circuit group includes:

[0015] a first thyristor circuit, wherein a controlled end of the first thyristor circuit is electrically connected to the first drive circuit, and an input end of the first thyristor circuit is electrically connected to the three-phase input end; the first thyristor circuit is used to control the positive output of the three-phase voltage according to the drive signal output by the drive circuit;

[0016] A second thyristor circuit, wherein the controlled end of the second thyristor circuit is electrically connected to the second drive circuit, and the input end of the second thyristor circuit is electrically connected to the three-phase input end; the second thyristor circuit is used to control the negative output of the three-phase voltage according to the drive signal output by the drive circuit.

[0017] Preferably, the voltage regulating circuit further includes:

[0018] a first unidirectional conduction circuit, wherein a first end of the first unidirectional conduction circuit is electrically connected to the first driving circuit, and a second end of the first thyristor circuit is electrically connected; the first unidirectional conduction circuit is used to limit the current flow direction of the first thyristor circuit;

[0019] A second unidirectional conducting circuit, wherein a first end of the second unidirectional conducting circuit is electrically connected to the second driving circuit, and a second end of the second thyristor circuit is electrically connected; the second unidirectional conducting circuit is used for limiting the current flow direction of the second thyristor circuit.

[0020] The utility model also provides a temperature control device, which includes a three-phase input terminal, a DC input terminal, a main control circuit, and a voltage regulating circuit as described in any one of the above items.

[0021] Preferably, the temperature control device further comprises a temperature detection circuit, the output end of which is electrically connected to the main control circuit; the temperature detection circuit is used to detect the internal temperature of the temperature control device and output a temperature detection signal.

[0022] Preferably, the temperature control device further comprises a communication circuit, one end of the communication circuit is electrically connected to the main control circuit, and the other end of the communication circuit is electrically connected to the communication interface; the communication circuit is used to transmit communication signals.

[0023] Preferably, the temperature control device also includes a phase loss sampling circuit, the input end of the phase loss sampling circuit is electrically connected to the three-phase input end, and the output end of the phase loss sampling circuit is electrically connected to the main control circuit; the phase loss sampling circuit is used to detect the input of the three-phase voltage and output a phase loss sampling signal.

[0024] Preferably, the temperature control device further comprises a touch control component, the output end of which is electrically connected to the main control circuit; the touch control component is used to output a touch control signal;

[0025] Wherein, the touch control component is arranged on the outside of the temperature control device.

[0026] The technical solution of the utility model adopts a voltage regulating circuit and is applied to a temperature control device. The temperature control device includes a three-phase input terminal, a DC input terminal and a main control circuit, and the voltage regulating circuit includes a switch circuit, a drive circuit group and a thyristor circuit group. The main control circuit outputs a control signal to control the switch circuit so that the switch circuit controls the power level output by the DC input terminal. The drive control circuit is controlled by the switch circuit to the DC input terminal, so that the thyristor circuit group controls the output of the three-phase voltage. The voltage regulating circuit only regulates one phase of the three-phase alternating current. The voltage regulating circuit stabilizes the voltage output by controlling the voltage of each phase of the three-phase alternating current. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0028] Figure 1 It is a structural schematic diagram of the voltage regulating circuit of the utility model;

[0029] Figure 2This is a schematic diagram of the structure of an embodiment of a voltage regulating circuit of the utility model;

[0030] Figure 3 It is a structural schematic diagram of another embodiment of the voltage regulating circuit of the utility model;

[0031] Figure 4 This is a schematic structural diagram of an embodiment of the temperature control device of the utility model;

[0032] Description of Figure Numbers:

[0033] Label name Label name 10 Switching Circuit 42 The first unidirectional conduction circuit 20 Drive circuit group R1-R5 First resistor - fifth resistor 30 Thyristor circuit group D1-D4 The first diode - the fourth diode 31 First thyristor circuit C1-C3 First capacitor - third capacitor 32 Second thyristor circuit Q1 The first switch 41 The first unidirectional conduction circuit

[0034] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0038] In the prior art, the power supply used by many industrial heating devices is usually three-phase alternating current. Heating devices using three-phase alternating current as a power source have many advantages such as high power, high efficiency, stable operation and easy control. However, there are also technical problems of difficult control in practical applications. When three-phase alternating current is used to power the heating device, the three-phase alternating current power supply may be abnormal due to the instability of the control circuit, resulting in safety hazards in the heating device, and thus the heating device cannot be effectively kept in a constant temperature control state.

[0039] Therefore, reference Figure 1 and Figure 3 In the utility model, a voltage regulating circuit is proposed and applied to a temperature control device. The temperature control device includes a three-phase input terminal, a DC input terminal and a main control circuit. The voltage regulating circuit includes:

[0040] A switch circuit 10, wherein a controlled end of the switch circuit 10 is electrically connected to an output end of the main control circuit, an input end of the switch circuit 10 is electrically connected to the DC input end, and an output end of the switch circuit 10 is electrically connected to a ground end;

[0041] A driving circuit group 20, one end of the driving circuit group 20 is electrically connected to the switch circuit 10, and the other end of the driving circuit group 20 is electrically connected to the DC input end;

[0042] A thyristor circuit group 30, wherein a controlled end of the thyristor circuit group 30 is electrically connected to the driving circuit group 20, and an input end of the thyristor circuit group 30 is electrically connected to the three-phase input end;

[0043] Among them, the main control circuit is used to output a control signal to control the opening degree of the switch circuit 10; the drive circuit group 20 is used to drive the thyristor circuit group 30 to work according to the opening degree of the switch circuit 10, so that the thyristor circuit group 30 controls the output of the three-phase voltage.

[0044] In this embodiment, the main control circuit can be implemented by a main controller, such as MCU (Microcontroller Unit), DSP (Digital Signal Process), FPGA (Field Programmable Gate Array), SOC (System On Chip), etc. Among them, the main control circuit can use the current temperature fed back by the temperature detection circuit in real time, compare it with the set temperature, use the PID algorithm to control, adjust the output duty cycle of the thyristor single tube, adjust the output voltage of the three-phase electricity, and then achieve the technical effect of constant temperature.

[0045] In this embodiment, the switch circuit 10 can be implemented by at least one switch tube, such as a MOS tube, an IGBT tube, a thyristor, a triode, a power tube, etc. Specifically, the switch circuit 10 includes a first resistor R1, a second resistor R2, a third resistor R3, and a first switch tube Q1; wherein the first end of the first resistor R1 is electrically connected to the main control circuit, and the second end of the first resistor R1 is electrically connected to the first end of the second resistor R2 and the controlled end of the first switch tube Q1; the second end of the second resistor R2 is electrically connected to the output end and the ground end of the first switch tube Q1; the first end of the third resistor R3 is electrically connected to the input end of the first switch tube Q1, and the second end of the third resistor R3 is electrically connected to the drive circuit group 20. Further, the first switch is an NPN triode, which controls the time ratio of the NPN triode on and off states by receiving the PWM control signal output by the main control circuit, so as to adjust the average current through the NPN triode, thereby controlling the power output in the circuit or the voltage and current level of the system. It is understandable that by changing the duty cycle of the PWM signal, accurate control of the load power can be achieved. The first resistor R1 is a protection resistor of the switch circuit 10; the second resistor R2 is a pull-down resistor of the switch circuit 10; and the third resistor R3 is a load resistor of the switch circuit 10.

[0046] In this embodiment, the drive circuit group 20 can be implemented by using multiple bidirectional thyristor optocouplers, specifically EL3052. EL3052 includes a gallium arsenide infrared light emitting diode coupled to a bidirectional thyristor. The infrared light emitting diode emits infrared rays of sufficient intensity under the action of 5-15mA forward current to trigger the output part. The output part is a silicon photosensitive bidirectional thyristor, which can conduct in both directions under the action of infrared rays. It has a good isolation effect on the input and output electrical signals. The input electrical signal drives the light emitting diode (LED) to emit light of a certain wavelength, which is received by the photodetector to generate photocurrent, and then output after further amplification. This completes the conversion of electricity-light-electricity, thereby playing the role of input and output isolation. The main control circuit controls the duty cycle of the NPN transistor in the switch circuit 10 by outputting a PWM control signal, thereby changing the wavelength of the driving light emitting diode in the bidirectional thyristor optocoupler, realizing signal control and transmission, and improving the anti-interference ability of the drive circuit.

[0047] Furthermore, the drive circuit group 20 includes: a first drive circuit, one end of which is electrically connected to the DC input end; the first drive circuit is used to drive the thyristor circuit group 30 to work according to the degree of opening of the switch circuit 10; a second drive circuit, one end of which is electrically connected to the first drive circuit; the second drive circuit is used to drive the thyristor circuit group 30 to work according to the degree of opening of the switch circuit 10.

[0048] In this embodiment, the thyristor circuit group 30 includes:

[0049] A first thyristor circuit 31, wherein the controlled end of the first thyristor circuit 31 is electrically connected to the first drive circuit, and the input end of the first thyristor circuit 31 is electrically connected to the three-phase input end; the first thyristor circuit 31 is used to control the positive output of the three-phase voltage according to the drive signal output by the drive circuit; a second thyristor circuit 32, wherein the controlled end of the second thyristor circuit 32 is electrically connected to the second drive circuit, and the input end of the second thyristor circuit 32 is electrically connected to the three-phase input end; the second thyristor circuit 32 is used to control the negative output of the three-phase voltage according to the drive signal output by the drive circuit.

[0050] It should be understood that, as an alternating current, three-phase alternating current has a positive voltage and a negative voltage. Therefore, in order to achieve effective use of the power supply, two thyristor circuits need to be respectively set to achieve the control of the positive voltage and the negative voltage in the three-phase alternating current. The first thyristor circuit 31 and the second thyristor circuit 32 need to be provided with corresponding drive circuits to control the first thyristor circuit 31 and the second thyristor circuit 32. Among them, the thyristor circuit can be implemented by a unidirectional thyristor. The opening angle of the unidirectional thyristor in the first thyristor circuit 31 is controlled by the first drive circuit, and the opening angle of the unidirectional thyristor in the second thyristor circuit 32 is controlled by the second drive circuit, so as to achieve one-phase voltage control in the three-phase alternating current. In addition, the voltage regulating circuit also includes a plurality of resistors for preventing the input current from being too large, thereby protecting the unidirectional thyristors in the first thyristor circuit 31 and the second thyristor circuit 32.

[0051] In this embodiment, the switch circuit 10 is controlled by outputting a control signal through the main control circuit, so that the switch circuit 10 controls the power level outputted from the DC input terminal. The drive control circuit is controlled by the switch circuit 10 on the DC input terminal, so that the thyristor circuit group 30 controls the output of the three-phase voltage. Among them, the voltage regulating circuit only regulates one phase of the three-phase alternating current. In practical applications, three groups of voltage regulating circuits need to be set to realize the control of each phase of U, V, and W in the three-phase alternating current. The voltage regulating circuit stabilizes the output of the voltage by controlling the voltage of each phase of the three-phase alternating current.

[0052] refer to Figure 3 In one embodiment of the utility model, the voltage regulating circuit further includes:

[0053] a first unidirectional conduction circuit 41, wherein a first end of the first unidirectional conduction circuit 41 is electrically connected to the first driving circuit, and a second end of the first thyristor circuit 31 is electrically connected; the first unidirectional conduction circuit 41 is used to limit the current flow direction of the first thyristor circuit 31;

[0054] A second unidirectional conduction circuit 42 , wherein a first end of the second unidirectional conduction circuit 42 is electrically connected to the second driving circuit, and a second end of the second thyristor circuit 32 is electrically connected; the second unidirectional conduction circuit 42 is used to limit the current flow direction of the second thyristor circuit 32 .

[0055] In this embodiment, the first unidirectional conduction circuit 41 and the second unidirectional conduction circuit 42 can both be implemented by multiple diodes. Specifically, the first unidirectional conduction circuit 41 includes a first diode D1 and a second diode D2; wherein the anode of the first diode D1 is electrically connected to the first drive circuit, and the cathode is electrically connected to the K pin of the thyristor in the first thyristor circuit 31; the anode of the second diode D2 is electrically connected to the G pin of the thyristor in the first thyristor circuit 31. The anode of the third diode D3 is electrically connected to the second drive circuit, and the cathode is electrically connected to the K pin of the thyristor in the second thyristor circuit 32; the anode of the fourth diode D4 is electrically connected to the G pin of the thyristor in the second thyristor circuit 32. By separately setting diodes, the current is unidirectionally conducted, and the technical effect of preventing backflow is achieved.

[0056] In addition, the voltage regulation circuit also includes a filter circuit. Specifically, the filter circuit includes a first capacitor C1, a second capacitor C2 and a fourth resistor R4. The first end of the first capacitor C1 is electrically connected to the first end of the second capacitor C2, the first end of the fourth resistor R4, and the DC input end, and the second end is electrically connected to the second end of the second capacitor C2 and the ground end; the second end of the fourth resistor R4 is electrically connected to the collector of the NPN transistor. By setting the filter circuit, the input DC power supply is stabilized.

[0057] The present invention also proposes a temperature control device, which includes a three-phase input terminal, a DC input terminal, a main control circuit, and the voltage regulating circuit as described above. It is worth noting that since the temperature control device of the present invention is based on the voltage regulating circuit described above, the embodiments of the temperature control device of the present invention include all technical solutions of all embodiments of the voltage regulating circuit described above, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0058] refer to Figure 2 In one embodiment of the utility model, the temperature control device also includes a temperature detection circuit, and the output end of the temperature detection circuit is electrically connected to the main control circuit; the temperature detection circuit is used to detect the internal temperature of the temperature control device and output a temperature detection signal.

[0059] In this embodiment, the temperature detection circuit can be implemented by a detection circuit based on a thermistor, such as a resistor voltage divider circuit based on an NTC resistor or an NTC probe, or a resistor voltage divider circuit based on a PTC resistor or a PTC probe. Optionally, the temperature detection circuit can also be implemented by a temperature sensor, such as an infrared temperature sensor, a thermocouple temperature sensor, etc. There can be multiple temperature detection circuits, and the multiple temperature detection circuits can be arranged at different positions in the temperature control device. The main control circuit can determine multiple temperature values ​​according to multiple temperature detection signals, and calculate the actual ambient temperature through a preset temperature algorithm, such as an average value, a weighted calculation, etc., so as to improve the accuracy of the detection of the ambient temperature of the hanger.

[0060] Optionally, in one embodiment, the main control circuit can control the switch circuit 10 to be in a closed state or an open state according to the preset control logic based on the temperature value obtained by the temperature detection signal, so that in actual application, the drive circuit is powered on or off. For example, during the development period, the R&D personnel set a preset alarm temperature in the main control circuit in advance, and the alarm temperature is 85°C. If the circuit module in the current temperature control device fails and causes heating, the temperature around the temperature control device, that is, the above-mentioned ambient temperature, will rise and exceed the preset alarm temperature. In this way, in the actual working process, when the main control circuit determines that the current ambient temperature has reached the preset alarm temperature according to the temperature detection signal, it is confirmed that the circuit in the current temperature control device has failed and caused overheating, and the switch circuit 10 will be controlled to be in an open state, so that the circuit is powered off, effectively ensuring the safety of the temperature control device. Further, when the temperature reaches the preset alarm temperature, the main control circuit can also output a signal to the display interface through the communication circuit to inform the user of the temperature control device failure.

[0061] Specifically, refer to Figure 3 In one embodiment, the temperature detection circuit includes a thermistor, a fifth resistor R5, and a third capacitor C3; the first end of the fifth resistor R5 is electrically connected to the main control circuit, the first end of the thermistor, and the first end of the third capacitor C3, and the second end is electrically connected to the second end of the thermistor, the second end of the third capacitor C3, and the ground end.

[0062] Among them, the thermistor can be PTC (Positive Temperature Coefficient, positive temperature coefficient thermistor), NTC (Negative Temperature Coefficient, negative temperature coefficient thermistor), CTR (Critical Temperature Resistor, critical temperature thermistor). The fifth resistor R5 is a fixed resistance resistor. The resistance of the thermistor will change with the change of temperature, and output the corresponding voltage signal (temperature detection signal) to the main control circuit. The ADC module in the main control circuit will obtain the voltage signal and determine the voltage value of the signal. Then the main control circuit will calculate the resistance of the thermistor based on the voltage value, the known first voltage value and the resistance of the fifth resistor R5, and determine the temperature corresponding to the current resistance of the thermistor through the resistance-temperature mapping table preset therein, and use it as the ambient temperature.

[0063] In one embodiment of the utility model, the temperature control device further comprises a communication circuit, one end of the communication circuit is electrically connected to the main control circuit, and the other end of the communication circuit is electrically connected to the communication interface; the communication circuit is used to transmit communication signals.

[0064] In this embodiment, the communication circuit can be implemented by wired communication. For example, USART, UART, RS-485, RS-232, etc. Through wired communication, the temperature control device can be connected to the external control device for communication, and control between different levels can be achieved. In addition, the communication circuit can also realize the control connection between the internal module of the temperature control device and the external module. For example, through the communication circuit, the main control circuit can be connected to the display module and the touch component for communication.

[0065] refer to Figure 4 In one embodiment of the utility model, the temperature control device also includes a phase loss sampling circuit, the input end of the phase loss sampling circuit is electrically connected to the three-phase input end, and the output end of the phase loss sampling circuit is electrically connected to the main control circuit; the phase loss sampling circuit is used to detect the input of the three-phase voltage and output a phase loss sampling signal.

[0066] In this embodiment, the power source controlled by the temperature control device is three-phase AC, and if any phase of the three-phase AC is disconnected or the voltage drops significantly, that is, phase loss occurs, the heating device will not work properly, and the heating elements of the phase or two phases that are not powered will not work, and the remaining phases may be overloaded. Therefore, a phase loss sampling circuit needs to be set in the temperature control device to obtain a voltage sampling signal. When there is a disconnection or phase loss in the three-phase AC, the main control circuit will control the output to be turned off to avoid damage to the device due to phase loss operation.

[0067] In one embodiment of the present utility model, the temperature control device further comprises a touch control component, the output end of the touch control component is electrically connected to the main control circuit; the touch control component is used to output a touch control signal;

[0068] Wherein, the touch control component is arranged on the outside of the temperature control device.

[0069] In this embodiment, the touch control component can be implemented by a liquid crystal display operation panel. The user can adjust the parameters by touching the liquid crystal display operation panel. For example, the constant temperature of the heating device can be controlled to achieve temperature adjustment.

[0070] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A voltage regulating circuit, applied to a temperature control device, characterized in that: The temperature control device includes a three-phase input terminal, a DC input terminal and a main control circuit, and the voltage regulation circuit includes: a switch circuit, wherein a controlled end of the switch circuit is electrically connected to an output end of the main control circuit, an input end of the switch circuit is electrically connected to the DC input end, and an output end of the switch circuit is electrically connected to a ground end; A driving circuit group, one end of which is electrically connected to the switch circuit, and the other end of which is electrically connected to the DC input terminal; A thyristor circuit group, wherein a controlled end of the thyristor circuit group is electrically connected to the driving circuit group, and an input end of the thyristor circuit group is electrically connected to the three-phase input end; Among them, the main control circuit is used to output a control signal to control the opening degree of the switching circuit; the driving circuit group is used to drive the thyristor circuit group to work according to the opening degree of the switching circuit, so that the thyristor circuit group controls the output of the three-phase voltage.

2. The voltage regulating circuit according to claim 1, characterized in that: The switch circuit comprises a first resistor, a second resistor, a third resistor, and a first switch tube; Among them, the first end of the first resistor is electrically connected to the main control circuit, the second end of the first resistor is electrically connected to the first end of the second resistor and the controlled end of the first switch tube; the second end of the second resistor is electrically connected to the output end and the ground end of the first switch tube; the first end of the third resistor is electrically connected to the input end of the first switch tube, and the second end of the third resistor is electrically connected to the drive circuit group.

3. The voltage regulating circuit according to claim 1, characterized in that: The driving circuit group comprises: a first drive circuit, one end of which is electrically connected to the DC input end; the first drive circuit is used to drive the thyristor circuit group to work according to the opening degree of the switch circuit; A second driving circuit, one end of which is electrically connected to the first driving circuit; the second driving circuit is used to drive the thyristor circuit group to work according to the opening degree of the switch circuit.

4. The voltage regulating circuit according to claim 3, characterized in that: The thyristor circuit group comprises: a first thyristor circuit, wherein a controlled end of the first thyristor circuit is electrically connected to the first drive circuit, and an input end of the first thyristor circuit is electrically connected to the three-phase input end; the first thyristor circuit is used to control the positive output of the three-phase voltage according to the drive signal output by the drive circuit; A second thyristor circuit, wherein the controlled end of the second thyristor circuit is electrically connected to the second drive circuit, and the input end of the second thyristor circuit is electrically connected to the three-phase input end; the second thyristor circuit is used to control the negative output of the three-phase voltage according to the drive signal output by the drive circuit.

5. The voltage regulating circuit according to claim 4, characterized in that: The voltage regulating circuit further includes: a first unidirectional conduction circuit, wherein a first end of the first unidirectional conduction circuit is electrically connected to the first driving circuit, and a second end of the first thyristor circuit is electrically connected; the first unidirectional conduction circuit is used to limit the current flow direction of the first thyristor circuit; A second unidirectional conducting circuit, wherein a first end of the second unidirectional conducting circuit is electrically connected to the second driving circuit, and a second end of the second thyristor circuit is electrically connected; the second unidirectional conducting circuit is used for limiting the current flow direction of the second thyristor circuit.

6. A temperature control device, characterized in that: The temperature control device comprises a three-phase input terminal, a DC input terminal, a main control circuit and a voltage regulating circuit as described in any one of claims 1-5.

7. The temperature control device according to claim 6, characterized in that: The temperature control device further comprises a temperature detection circuit, the output end of which is electrically connected to the main control circuit; the temperature detection circuit is used to detect the internal temperature of the temperature control device and output a temperature detection signal.

8. The temperature control device according to claim 6, characterized in that: The temperature control device also includes a communication circuit, one end of which is electrically connected to the main control circuit, and the other end of which is electrically connected to the communication interface; the communication circuit is used to transmit communication signals.

9. The temperature control device according to claim 6, characterized in that: The temperature control device also includes a phase loss sampling circuit, the input end of the phase loss sampling circuit is electrically connected to the three-phase input end, and the output end of the phase loss sampling circuit is electrically connected to the main control circuit; the phase loss sampling circuit is used to detect the input of the three-phase voltage and output a phase loss sampling signal.

10. The temperature control device according to claim 6, characterized in that: The temperature control device further comprises a touch control component, the output end of which is electrically connected to the main control circuit; the touch control component is used to output a touch control signal; Wherein, the touch control component is arranged on the outside of the temperature control device.

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