Temperature control circuit and temperature control device based on motor driving chip
By using a combination of motor drive chip and H-bridge circuit, the problem of poor applicability of existing dedicated chips is solved, enabling precise temperature control of high-voltage, high-current thermoelectric coolers, broadening the application range of temperature control circuits and ensuring temperature consistency.
Patent Information
- Application Number
- CN202520332809.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-27
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-02-27
AI Technical Summary
Existing dedicated chips have poor applicability for TEC temperature control and cannot be adapted to high-voltage, high-current applications.
By replacing the dedicated temperature control chip with a motor drive chip, and combining it with an H-bridge circuit, a filter circuit, and a temperature sensor, a PWM signal is generated through digital PID control to drive the thermoelectric cooler, thereby achieving precise temperature control of the controlled load.
It achieves applicability to high-voltage, high-current thermoelectric coolers, broadens the application range of temperature control circuits, ensures the consistency between the controlled load temperature and the set temperature, and features a simple structure, low cost, high efficiency, and strong applicability.
Smart Images
Figure CN223743003U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electronic technical field, concretely relates to a temperature control circuit and temperature control device based on motor drive chip. BACKGROUND
[0002] Thermoelectric refrigerator utilizes the thermoelectric effect of semiconductor material, that is, when electric current passes through the thermocouple connected by P-type and N-type semiconductor elements, temperature difference and heat transfer are generated to achieve the purpose of refrigeration or heating. Thermoelectric refrigerator is widely used in semiconductor laser temperature control and other fields due to its small size, light weight, no noise, no vibration, heating or refrigeration by changing the current direction of thermoelectric refrigerator, fast action, long service life, easy control and other characteristics.
[0003] AD and MAXIM company have special chips for TEC (thermoelectric refrigerator) temperature control, but these special chips have low working voltage and use analog PID control, which is not suitable for various models of TEC application occasions such as high voltage and large current, and has poor adaptability. INVENTION CONTENTS
[0004] The utility model discloses a kind of temperature control circuit and temperature control device based on motor drive chip, to realize the accurate control to controlled load temperature.
[0005] To solve the above technical problems, the utility model provides a kind of technical scheme: a kind of temperature control circuit based on motor drive chip, including motor drive chip, H bridge circuit, filter circuit, thermoelectric refrigerator, temperature sensor;Thermoelectric refrigerator is set on controlled load, and temperature sensor senses the temperature of controlled load and transmits temperature signal to motor drive chip, after receiving temperature signal, motor drive chip generates PWM signal after digital PID control, and after PWM signal flows to filter circuit for filtering after H bridge circuit, filtered PWM signal is transmitted to thermoelectric refrigerator.
[0006] According to the above scheme, motor drive chip is built-in analog-digital conversion module, half-bridge driver.
[0007] According to the above scheme, H bridge circuit includes field effect transistor V1, field effect transistor V2, field effect transistor V3, field effect transistor V4, resistance R1, resistance R2, resistance R3, resistance R4, capacitor C3, capacitor C4;
[0008] One end of resistance R1 is electrically connected to the gate of field effect transistor V1, and the other end is electrically connected to the U-phase upper arm output of motor drive chip;
[0009] One end of resistance R2 is electrically connected to the gate of field effect transistor V1, and the other end is electrically connected to the source of field effect transistor V1;
[0010] One end of the capacitor C3 is electrically connected to the source of the field effect tube V1, and the other end is electrically connected to the U-phase bootstrap power output of the half-bridge driver;
[0011] The gate of the field effect tube V2 is electrically connected to the U-phase lower bridge arm output of the half-bridge driver.
[0012] One end of the resistor R3 is electrically connected to the gate of the field effect tube V3, and the other end is electrically connected to the V-phase upper bridge arm output of the motor drive chip.
[0013] One end of the resistor R4 is electrically connected to the gate of the field effect tube V3, and the other end is electrically connected to the source of the field effect tube V3.
[0014] One end of the capacitor C4 is electrically connected to the source of the field effect tube V3, and the other end is electrically connected to the V-phase bootstrap power output of the half-bridge driver.
[0015] The gate of the field effect tube V4 is electrically connected to the V-phase lower bridge arm output of the half-bridge driver.
[0016] According to the above scheme, the filter circuit comprises an inductor L1, a capacitor C1, an inductor L2 and a capacitor C2.
[0017] One end of the inductor L1 is electrically connected to the source of the field effect tube V1, and the other end is electrically connected to the capacitor C1.
[0018] One end of the inductor L2 is electrically connected to the source of the field effect tube V1, and the other end is electrically connected to the capacitor C2.
[0019] The connection points between the inductor L1 and the capacitor C1, and the connection points between the inductor L2 and the capacitor C2, are respectively electrically connected to the two poles of the thermoelectric refrigerator.
[0020] According to the above scheme, the temperature sensor is electrically connected to the analog-to-digital conversion module.
[0021] The utility model discloses still provide a temperature control device, be provided with temperature control circuit, temperature control circuit includes motor drive chip, H bridge circuit, filter circuit, thermoelectric refrigerator, temperature sensor, thermoelectric refrigerator sets up on controlled load, and temperature sensor senses the temperature of controlled load and transmits temperature signal to motor drive chip, and after receiving temperature signal, motor drive chip produces PWM signal after digital PID control, and after PWM signal flows to filter circuit and filters after H bridge circuit, and the PWM signal after filtering is transmitted to thermoelectric refrigerator.
[0022] According to the above scheme, the motor drive chip is built-in analog-to-digital conversion module and half-bridge driver.
[0023] According to the above scheme, the H-bridge circuit comprises field effect transistor V1, field effect transistor V2, field effect transistor V3, field effect transistor V4, resistor R1, resistor R2, resistor R3, resistor R4, capacitor C3, and capacitor C4.
[0024] One end of the resistor R1 is electrically connected to the gate of the field effect transistor V1, and the other end is electrically connected to the U-phase upper bridge arm output of the motor driving chip.
[0025] One end of the resistor R2 is electrically connected to the gate of the field effect transistor V1, and the other end is electrically connected to the source of the field effect transistor V1.
[0026] One end of the capacitor C3 is electrically connected to the source of the field effect transistor V1, and the other end is electrically connected to the U-phase bootstrap power output of the half-bridge driver.
[0027] The gate of the field effect transistor V2 is electrically connected to the U-phase lower bridge arm output of the half-bridge driver.
[0028] One end of the resistor R3 is electrically connected to the gate of the field effect transistor V3, and the other end is electrically connected to the V-phase upper bridge arm output of the motor driving chip.
[0029] One end of the resistor R4 is electrically connected to the gate of the field effect transistor V3, and the other end is electrically connected to the source of the field effect transistor V3.
[0030] One end of the capacitor C4 is electrically connected to the source of the field effect transistor V3, and the other end is electrically connected to the V-phase bootstrap power output of the half-bridge driver.
[0031] The gate of the field effect transistor V4 is electrically connected to the V-phase lower bridge arm output of the half-bridge driver.
[0032] According to the above scheme, the filter circuit comprises inductor L1, capacitor C1, inductor L2, and capacitor C2.
[0033] One end of the inductor L1 is electrically connected to the source of the field effect transistor V1, and the other end is electrically connected to the capacitor C1.
[0034] One end of the inductor L2 is electrically connected to the source of the field effect transistor V1, and the other end is electrically connected to the capacitor C2.
[0035] The connection points between the inductor L1 and the capacitor C1, and the connection points between the inductor L2 and the capacitor C2, are respectively electrically connected to the two poles of the thermoelectric refrigerator.
[0036] According to the above scheme, the temperature sensor is electrically connected to the analog-to-digital conversion module.
[0037] The utility model discloses the beneficial effect is: the utility model discloses a lower working voltage of traditional temperature control circuit is replaced for the motor drive chip of higher working voltage with the temperature control special chip of temperature control circuit, and the motor drive chip of original drive motor is used to drive the thermoelectric refrigerator, so that temperature control circuit can adapt to the thermoelectric refrigerator of higher working voltage / current, improve the applicability of temperature control circuit, widen the application range of temperature control circuit. BRIEF DESCRIPTION OF DRAWINGS
[0038] Figure 1 It is the temperature control circuit schematic diagram based on motor drive chip of the utility model one embodiment;
[0039] Figure 2 The circuit diagram of the temperature control circuit based on motor drive chip of the utility model one embodiment. DETAILED DESCRIPTION
[0040] In order to make the purpose, technical scheme and advantage of the embodiments of the present disclosure more clear, the technical scheme of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present disclosure.
[0041] Referring to Figure 1 The embodiment discloses a temperature control circuit based on motor drive chip, including motor drive chip, H bridge circuit, filter circuit, thermoelectric refrigerator (TEC), temperature sensor (TS);Thermoelectric refrigerator is arranged on the controlled load, and the temperature sensor senses the temperature of the controlled load and transmits the temperature signal to the motor drive chip, and the motor drive chip generates the PWM signal after receiving the temperature signal and after digital PID control, and the PWM signal flows to the filter circuit for filtering after H bridge circuit, and the filtered PWM signal is transmitted to the thermoelectric refrigerator.
[0042] Further, referring to Figure 2The H-bridge circuit comprises a field effect transistor V1, a field effect transistor V2, a field effect transistor V3, a field effect transistor V4, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C3 and a capacitor C4.
[0043] One end of the resistor R1 is electrically connected to the gate of the field effect transistor V1, and the other end is electrically connected to the U-phase upper bridge arm output of the motor driving chip.
[0044] One end of the resistor R2 is electrically connected to the gate of the field effect transistor V1, and the other end is electrically connected to the source of the field effect transistor V1.
[0045] One end of the capacitor C3 is electrically connected to the source of the field effect transistor V1, and the other end is electrically connected to the U-phase bootstrap power output of the half-bridge driver.
[0046] The gate of the field effect transistor V2 is electrically connected to the U-phase lower bridge arm output of the half-bridge driver.
[0047] One end of the resistor R3 is electrically connected to the gate of the field effect transistor V3, and the other end is electrically connected to the V-phase upper bridge arm output of the motor driving chip.
[0048] One end of the resistor R4 is electrically connected to the gate of the field effect transistor V3, and the other end is electrically connected to the source of the field effect transistor V3.
[0049] One end of the capacitor C4 is electrically connected to the source of the field effect transistor V3, and the other end is electrically connected to the V-phase bootstrap power output of the half-bridge driver.
[0050] The gate of the field effect transistor V4 is electrically connected to the V-phase lower bridge arm output of the half-bridge driver.
[0051] In other embodiments of the utility model, the H-bridge circuit can be replaced by MOSFET or BJT or IGBT or other switching elements.
[0052] Further, the filter circuit comprises an inductor L1, a capacitor C1, an inductor L2 and a capacitor C2.
[0053] One end of the inductor L1 is electrically connected to the source of the field effect transistor V1, and the other end is electrically connected to the capacitor C1.
[0054] One end of the inductor L2 is electrically connected to the source of the field effect transistor V1, and the other end is electrically connected to the capacitor C2.
[0055] The connection points between the inductor L1 and the capacitor C1 and the connection points between the inductor L2 and the capacitor C2 are respectively electrically connected to the two poles of the thermoelectric refrigerator.
[0056] In this embodiment, the field effect transistor V1, the field effect transistor V2, the inductor L1 and the capacitor C1 constitute a synchronous step-down circuit I; the field effect transistor V3, the field effect transistor V4, the inductor L2 and the capacitor C2 constitute a synchronous step-down circuit II.
[0057] Further, the motor driving chip is built-in with an analog-digital conversion module (ADC), a half-bridge driver and a dead zone control timer; the H-bridge circuit is electrically connected to the half-bridge driver and is subjected to PID digital control by the electrode driving chip; the temperature sensor is electrically connected to the analog-digital conversion module.
[0058] Further, the temperature sensor can be a thermistor or a platinum resistance, etc.
[0059] The utility model discloses a motor driving chip, through built-in analog-digital conversion collection temperature sensor voltage value, obtains load temperature and set value deviation, this deviation again after chip digital PID operation, produces dead zone control, width change's fixed frequency PWM signal (the width size of PWM signal decides the size of filter circuit output voltage, thereby control current size flowing through TEC), and PWM signal is driven H bridge circuit through the half-bridge driver of motor driving chip, produces the pressure difference between TEC positive and negative after filtering, reaches the purpose of refrigeration or heating, realizes the accurate temperature control to controlled load (such as semiconductor laser).
[0060] The working principle of the temperature control circuit of the embodiment is as follows:
[0061] When heating, the field effect transistor V1 and the field effect transistor V2 are controlled by the complementary PWM signal with dead zone generated by the U-phase half-bridge driver of the motor driving chip, and the power supply voltage VCC generates the voltage U1 at the negative electrode of the TEC through the synchronous step-down circuit I; at this time, the V-phase upper bridge arm of the gate driver of the motor driving chip outputs low level, the field effect transistor V3 is closed, the V-phase lower bridge arm of the gate driver of the motor driving chip outputs high level, the field effect transistor V4 is turned on, and the positive electrode voltage U2 of the TEC is zero. The negative electrode voltage U1 of the TEC is greater than the positive electrode voltage U2, and the TEC is in a heating state.
[0062] When refrigerating, the field effect transistor V3 and the field effect transistor V4 are controlled by the complementary PWM signal with dead zone generated by the V-phase half-bridge driver of the motor driving chip, and the power supply voltage VCC generates the voltage U2 at the positive electrode of the TEC through the synchronous step-down circuit II; at this time, the U-phase upper bridge arm of the gate driver of the motor driving chip outputs low level, the field effect transistor V1 is closed, the U-phase lower bridge arm of the gate driver of the motor driving chip outputs high level, the field effect transistor V2 is turned on, and the positive electrode voltage U1 of the TEC is zero. The positive electrode voltage U2 of the TEC is greater than the negative electrode voltage U1, and the TEC is in a refrigeration state.
[0063] The above merely illustrates the embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which are made by using the content of the present application specification and drawings, are also included in the patent protection scope of the present application.
Claims
1. A temperature control circuit based on a motor drive chip, characterized in that, The temperature sensor senses the temperature of the controlled load and transmits a temperature signal to the motor drive chip, and the motor drive chip generates a PWM signal after receiving the temperature signal and being controlled by a digital PID.
2. The temperature control circuit based on a motor drive chip according to claim 1, characterized in that, The motor drive chip is internally provided with an analog-digital conversion module and a half-bridge driver.
3. The temperature control circuit based on a motor drive chip according to claim 2, characterized in that, The H-bridge circuit comprises field effect tubes V1, V2, V3, V4, resistors R1, R2, R3, R4, and capacitors C3 and C4. One end of the resistor R1 is electrically connected to the gate of the field effect tube V1, and the other end is electrically connected to the U-phase upper bridge arm output of the motor drive chip. One end of the resistor R2 is electrically connected to the gate of the field effect tube V1, and the other end is electrically connected to the source of the field effect tube V1. One end of the capacitor C3 is electrically connected to the source of the field effect tube V1, and the other end is electrically connected to the U-phase bootstrap power output of the half-bridge driver. The gate of the field effect tube V2 is electrically connected to the U-phase lower bridge arm output of the half-bridge driver. One end of the resistor R3 is electrically connected to the gate of the field effect tube V3, and the other end is electrically connected to the V-phase upper bridge arm output of the motor drive chip. One end of the resistor R4 is electrically connected to the gate of the field effect tube V3, and the other end is electrically connected to the source of the field effect tube V3. One end of the capacitor C4 is electrically connected to the source of the field effect tube V3, and the other end is electrically connected to the V-phase bootstrap power output of the half-bridge driver. The gate of the field effect tube V4 is electrically connected to the V-phase lower bridge arm output of the half-bridge driver.
4. The temperature control circuit based on a motor drive chip according to claim 2, wherein, The filter circuit comprises inductors L1 and L2 and capacitors C1 and C2. One end of the inductor L1 is electrically connected to the source of the field effect tube V1, and the other end is electrically connected to the capacitor C1. One end of the inductor L2 is electrically connected to the source of the field effect tube V1, and the other end is electrically connected to the capacitor C2. The connection points between the inductor L1 and the capacitor C1, and between the inductor L2 and the capacitor C2, are respectively electrically connected to the two poles of the thermoelectric cooler.
5. The temperature control circuit based on a motor drive chip according to claim 2, wherein, The temperature sensor is electrically connected to the analog-digital conversion module.
6. A temperature control device, characterized by The temperature sensor senses the temperature of the controlled load and transmits a temperature signal to the motor drive chip, and the motor drive chip generates a PWM signal after receiving the temperature signal and being controlled by a digital PID.
7. The temperature control device according to claim 6, characterized in that, The motor drive chip is internally provided with an analog-digital conversion module and a half-bridge driver.
8. The temperature control device of claim 7, wherein, The H-bridge circuit comprises field effect tubes V1, V2, V3, V4, resistors R1, R2, R3, R4, and capacitors C3 and C4. One end of the resistor R1 is electrically connected to the gate of the field effect transistor V1, and the other end is electrically connected to the U-phase upper bridge arm output of the motor drive chip; One end of the resistor R2 is electrically connected to the gate of the field effect transistor V1, and the other end is electrically connected to the source of the field effect transistor V1; One end of the capacitor C3 is electrically connected to the source of the field effect transistor V1, and the other end is electrically connected to the U-phase bootstrap power output of the half-bridge driver; The gate of the field effect transistor V2 is electrically connected to the U-phase lower bridge arm output of the half-bridge driver; One end of the resistor R3 is electrically connected to the gate of the field effect transistor V3, and the other end is electrically connected to the V-phase upper bridge arm output of the motor drive chip; One end of the resistor R4 is electrically connected to the gate of the field effect transistor V3, and the other end is electrically connected to the source of the field effect transistor V3; One end of the capacitor C4 is electrically connected to the source of the field effect transistor V3, and the other end is electrically connected to the V-phase bootstrap power output of the half-bridge driver; The gate of the field effect transistor V4 is electrically connected to the V-phase lower bridge arm output of the half-bridge driver.
9. The temperature control device of claim 7, wherein, The filter circuit includes inductor L1, capacitor C1, inductor L2, and capacitor C2; One end of the inductor L1 is electrically connected to the source of the field effect transistor V1, and the other end is electrically connected to the capacitor C1; One end of the inductor L2 is electrically connected to the source of the field effect transistor V1, and the other end is electrically connected to the capacitor C2; The connection points between the inductor L1 and the capacitor C1, and between the inductor L2 and the capacitor C2, are respectively electrically connected to the two poles of the thermoelectric refrigerator.
10. The temperature control device of claim 7, wherein, The temperature sensor is electrically connected to the analog-to-digital conversion module.