Small hybrid integrated driving controller of linear Stirling cryocooler

Abstract

The invention discloses a small hybrid integrated driving controller of a linear Stirling cryocooler, and belongs to the technical field of Stirling cryocoolers. The controller comprises a signal processing circuit unit which is used for generating a sine pulse width modulation signal by using a sectional PID control algorithm according to an output signal of a temperature measuring diode of the linear Stirling cryocooler; and the power driving unit is used for generating a motor driving sine wave signal by decoding the sine pulse width modulation signal and controlling a motor in the linear Stirling cryocooler to move. The controller has the advantages of being small in size, high in integration degree and high in operation reliability.

Description

Technical Field

[0001] The invention relates to a small hybrid integrated drive controller for a linear Stirling refrigerator, belonging to the technical field of Stirling refrigerators. Background Art

[0002] The Stirling refrigerator is a commonly used refrigeration device characterized by high efficiency, rapid cooling, compact size, light weight, low power consumption, and high reliability. A Stirling refrigerator driver controller drives and controls the motor within the refrigerator, thereby controlling the refrigerator's cooling efficiency. Traditional Stirling refrigerator driver controllers suffer from unstable temperature control, large temperature drift errors, and large size, making them inadequate for domestically produced alternatives. Currently, there is an urgent need in China to develop a compact, highly reliable Stirling refrigerator driver controller that can serve as a domestically produced alternative. Summary of the Invention

[0003] The present invention provides a small hybrid integrated drive controller for a linear Stirling refrigerator. By detecting the feedback voltage signal from the refrigerator's cold-end temperature-measuring diode, a signal processing circuit outputs an SPWM signal to a pre-driver circuit for decoding. This signal controls the switching state of the N-MOS transistor to ensure stable motor operation and control. This controller offers the advantages of small size, high integration, and high operational reliability.

[0004] In order to achieve the above objectives / solve the above technical problems, the present invention is implemented by adopting the following technical solutions:

[0005] In one aspect, the present invention provides a small hybrid integrated drive controller for a linear Stirling refrigerator, comprising:

[0006] A signal processing circuit unit is used to generate a sinusoidal pulse width modulation signal using a segmented PID control algorithm according to an output signal of a temperature measuring diode of the linear Stirling refrigerator;

[0007] The power drive unit is used to generate a motor driving sinusoidal wave signal by decoding a sinusoidal pulse width modulation signal to control the movement of the motor inside the linear Stirling refrigerator.

[0008] Furthermore, the signal processing circuit unit includes a power supply module, a main control processing unit, a signal acquisition module and an analog-to-digital converter; the power supply module supplies power to the other modules; the signal acquisition module is connected to the temperature measuring diode at the cold end of the linear Stirling refrigerator to collect the feedback voltage signal output by the temperature measuring diode; the analog-to-digital converter converts the feedback voltage signal into a digital signal and inputs it into the main control processing unit; the main control processing module compares the temperature measuring voltage of the temperature measuring diode with the preset temperature control point voltage, and uses a segmented PID control algorithm to generate a corresponding sinusoidal pulse width modulation signal based on the difference between the two.

[0009] Furthermore, the signal processing circuit unit is specifically used for:

[0010] Calculate the error e(k) based on the temperature measurement voltage V1 of the temperature measurement diode and the preset temperature control point voltage V2;

[0011] Obtain the error range based on the historical temperature control data, divide the error range into multiple intervals, and set a PID parameter for each error interval;

[0012] The corresponding PID parameters are obtained according to the error interval corresponding to the error e(k), and the output pulse duty cycle is calculated according to the error e(k) and the PID parameters;

[0013] Generates a corresponding sinusoidal pulse width modulation signal according to the output pulse duty cycle.

[0014] Furthermore, the power supply module includes an input power supply and a step-down circuit. The input power supply inputs a 12V supply voltage, and generates 5.5V and 3.3V direct currents respectively through the step-down circuit.

[0015] Furthermore, the power module uses a 3.3V power supply terminal to build a 1000μA constant current source circuit for matching and driving the temperature measuring diode inside the linear Stirling refrigerator.

[0016] Furthermore, the constant current source circuit includes a first resistor, a second resistor, an operational amplifier, a third resistor and a fourth resistor, one end of the first resistor is connected to a 3.3V power supply, the other end of the first resistor is respectively connected to one end of the second resistor and one end of the third resistor, the other end of the second resistor is connected to the non-inverting input of the operational amplifier, the inverting input of the operational amplifier is connected to the output of the operational amplifier through the fourth resistor, and the output of the operational amplifier is also connected to the other end of the third resistor, outputting a constant current source of 1000μA.

[0017] Furthermore, the power drive unit includes a main drive chip and an H-bridge drive circuit, wherein the H-bridge drive circuit includes a first group of N-MOS transistors, a second group of N-MOS transistors, a plurality of capacitors for filtering, and a TVS diode for protecting the circuit, wherein each group of N-MOS transistors includes at least two N-MOS transistors;

[0018] The first output port of the main driver chip is connected to the G1 pole of the first group of N-MOS tubes, the second output port of the main driver chip is connected to the G2 pole of the first group of N-MOS tubes, the third output port of the main driver chip is connected to the G1 pole of the second group of N-MOS tubes, and the fourth output port of the main driver chip is connected to the G2 pole of the second group of N-MOS tubes; the D1 pole of the first group of N-MOS tubes is connected to the S1 pole of the second group of N-MOS tubes and outputs a first sequential drive signal DRV-A, the D2 pole of the first group of N-MOS tubes is connected to the S2 pole of the second group of N-MOS tubes and outputs a second sequential drive signal DRV-B, and the first sequential drive signal DRV-A and the second sequential drive signal DRV-B are used to control the movement of the motor inside the linear Stirling refrigerator; the D1 pole and D2 pole of the second group of N-MOS tubes are connected to the power module, and the S1 pole and S2 pole of the first group of N-MOS tubes are grounded.

[0019] Furthermore, the main driver chip solves the sinusoidal pulse width modulation signal output by the signal processing circuit unit to obtain the motor commutation logic, and generates four high and low pre-drive signals for the linear motor phases A and B, which are respectively recorded as the A-phase low-level pre-drive signal GLA, the A-phase high-level pre-drive signal GHA, the B-phase low-level pre-drive signal GLB and the B-phase high-level pre-drive signal GHB; the main driver chip is connected and controls the switches of the two groups of N-MOS tubes in the H-bridge drive circuit to be turned on and off in a specific order through the GLA, GHA, GLB and GHB signals.

[0020] Furthermore, the drive controller includes a filter circuit, which includes a first inductor and a second inductor; one end of the first inductor and one end of the second inductor are respectively connected to the power drive unit, for receiving the DRV-A signal and the DRV-B signal output by the power drive unit; the other ends of the first inductor and the second inductor are respectively connected to the A and B phases of the linear motor in the linear Stirling refrigerator, providing the linear motor with a motor drive sinusoidal wave signal;

[0021] A plurality of capacitors for filtering are connected in parallel between the other end of the first inductor and the other end of the second inductor.

[0022] In a second aspect, the present invention provides an integrated design method for a small hybrid integrated drive controller for a linear Stirling refrigerator, comprising:

[0023] The circuits of each unit of the small hybrid integrated drive controller for a linear Stirling refrigerator are arranged on both sides of a PCB. Bare cores are used for active devices, and all chip resistors and capacitors within the circuit are soldered. The N-MOS transistors within the power drive unit are soldered to the PCB, and heat dissipation is achieved by applying thermal grease to the back of the PCB, which is in close contact with the metal casing of the controller.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention proposes a small hybrid integrated drive controller for a linear Stirling refrigerator. The drive controller detects the feedback voltage signal of the refrigerator's cold-end temperature measuring diode, and the signal processing circuit outputs a sinusoidal pulse width modulation signal to the power drive unit for decoding, thereby generating a motor drive sinusoidal wave signal to control the operation of the refrigerator's internal motor to ensure the motor's operating state and stable control.

[0026] The controller of the present invention has a simple circuit structure, clear functional logic, high working reliability, universal material selection, easy debugging, small size, high integration, stable operation and the like, filling the gap in the field of domestic online linear Stirling motor drive controllers. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 FIG2 is a schematic diagram of the structure of a small hybrid integrated drive controller for a linear Stirling refrigerator according to an embodiment of the present invention;

[0028] Figure 2 FIG2 is a schematic structural diagram of a signal processing circuit unit in an embodiment of the present invention;

[0029] Figure 3 FIG2 is a schematic diagram of the PID control process of the main control processing unit in an embodiment of the present invention;

[0030] Figure 4 FIG2 is a structural diagram of a constant current source circuit according to an embodiment of the present invention;

[0031] Figure 5 FIG2 is a schematic diagram of the structure of the main driver chip in an embodiment of the present invention;

[0032] Figure 6 FIG2 is a schematic diagram of the structure of an H-bridge driving circuit according to an embodiment of the present invention;

[0033] Figure 7 FIG2 is a schematic diagram of the structure of the filter circuit in an embodiment of the present invention;

[0034] Figure 8 The figure shows a schematic diagram of the PCB layout structure of a small hybrid integrated drive controller for a linear Stirling refrigerator in an embodiment of the present invention. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solution of the present invention, rather than limitations on the technical solution of the present invention. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.

[0036] Example 1

[0037] This embodiment introduces a small hybrid integrated drive controller for a linear Stirling refrigerator, which is used to control the working state of the linear Stirling refrigerator motor in real time. Figure 1 As shown in the figure, the drive controller mainly includes a signal processing circuit unit and a power drive unit. The output signal of the temperature measuring diode of the linear Stirling refrigerator enters the signal processing circuit unit, and after being processed by the signal processing circuit unit, it outputs an SPWM (sine pulse width modulation) signal. The power drive unit generates a motor drive sinusoidal wave signal according to the real-time adjusted SPWM signal to control the motion amplitude of the linear motor inside the linear Stirling refrigerator, thereby achieving the purpose of regulating the cooling temperature of the Stirling refrigerator.

[0038] like Figure 2 As shown, the signal processing circuit unit includes a power supply module, a main control processing unit, a signal acquisition module and an analog-to-digital converter, wherein an MCU is used as the main control processing unit.

[0039] The signal acquisition module is connected to the temperature measuring diode at the cold end of the linear Stirling refrigerator to collect the feedback voltage signal output by the temperature measuring diode. The analog-to-digital converter converts the feedback voltage signal into a digital signal and inputs it into the main control processing unit. The main control processing module compares the temperature measuring voltage of the temperature measuring diode with the preset temperature control point voltage. Based on the difference between the two, a segmented PID control algorithm is used to generate a temperature control signal and a cooling indication signal, and then output an appropriate SPWM signal.

[0040] In the present invention, the method of obtaining the SPWM signal using the segmented PID control algorithm includes:

[0041] S1 calculates the error e(k) based on the temperature-measuring diode's temperature-measurement voltage V1 and the preset temperature-control point voltage V2. When the error e(k) ≤ 0, the linear Stirling refrigerator's temperature is within the normal range and no temperature control is required. The electronics of the linear Stirling refrigerator maintain full speed operation. When the error e(k) > 0, the linear Stirling refrigerator requires temperature control. The main control processing module enters temperature control mode and outputs a control signal based on the real-time calculated error e(k), dynamically adjusting the temperature within the range that satisfies temperature control accuracy.

[0042] S2. Obtain an error range based on historical temperature control data, divide the error range into multiple intervals, and set a PID parameter for each error interval.

[0043] S3. Obtain the corresponding PID parameters according to the error interval corresponding to the error e(k), and calculate the output pulse duty cycle according to the error e(k) and the PID parameters.

[0044] S4. Generate a corresponding SPWM signal according to the output pulse duty cycle and output it.

[0045] S5. Update the temperature control history data and the error range.

[0046] To ensure stable operation of the Stirling cooler across its full temperature range (-45°C to +80°C), the PID control algorithm primarily dynamically adjusts the temperature control phase. This minimizes voltage fluctuations, maintaining a temperature control accuracy of ≤±0.1mV and maintaining a relatively stable system. Subsequently, an SPWM signal is sent to the drive circuit, controlling the motor's amplitude to achieve the target temperature.

[0047] The power module consists of an input power supply and a step-down circuit. The input power supply inputs a 12V supply voltage, which is then converted to 5.5V and 3.3V through the step-down circuit to power the internal circuits. The power module uses the 3.3V supply to build a 1000μA constant current source circuit to match and drive the temperature-sensing diode inside the Stirling cooler. The constant current source has a deviation of 0.96mA to 1.04mA.

[0048] The schematic diagram of the constant current source circuit is as follows: Figure 4 As shown, it mainly includes a first resistor R9, a second resistor R11, an operational amplifier N3, a third resistor R13 and a fourth resistor R16. One end of the first resistor R9 is connected to a 3.3V power supply, and the other end of the first resistor R9 is respectively connected to one end of the second resistor R11 and one end of the third resistor R13. The other end of the second resistor R11 is connected to the non-inverting input end of the operational amplifier N3, and the inverting input end of the operational amplifier is connected to the output end of the operational amplifier through the fourth resistor R16. At the same time, the output end of the operational amplifier is also connected to the other end of the third resistor R13, outputting a constant current source of 1000μA.

[0049] like Figure 5 、 Figure 6 As shown, the power drive unit includes a main drive chip U1 and an H-bridge drive circuit, wherein the H-bridge drive circuit includes a first group of N-MOS transistors U2, a second group of N-MOS transistors U3 and multiple capacitors for filtering and TVS diodes for protecting the circuit, wherein each group of N-MOS transistors includes at least 2 N-MOS transistors.

[0050] The four input ends of the main driver chip U1 are respectively connected to the SPWM signals output by the main control processing module, specifically the A-phase high-level signal HGPWMA, the B-phase high-level signal HGPWMB, the A-phase low-level signal LGPWMA and the B-phase low-level signal LGPWMB; the main control driver chip generates the motor commutation logic by solving the SPWM signal, and outputs the pre-drive signal for driving the N-MOS tube, specifically the A-phase low-level pre-drive signal GLA, the A-phase high-level pre-drive signal GHA, the B-phase low-level pre-drive signal GLB and the B-phase high-level pre-drive signal GHB.

[0051] In this embodiment of the present invention, the main driver chip U1 uses the BC6288 chip. The BC6288 amplifies the input low-power signal into a high-current drive signal for the load, meeting the requirements of controlling the on and off of power devices while also providing isolation, protection, and anti-interference functions. The first group of N-MOS transistors U2 and the second group of N-MOS transistors U3 are model PW150N03HLD. The PW150N03HLD integrates two N-MOS transistors, so each group of N-MOS transistors has six pins, including G1 and G2.

[0052] The first output port of the main driver chip U1 outputting the GLA signal is connected to the G1 pole of the first group of N-MOS tubes U2, the second output port of the main driver chip U1 outputting the GHA signal is connected to the G2 pole of the first group of N-MOS tubes U2, the third output port of the main driver chip U1 outputting the GLB signal is connected to the G1 pole of the second group of N-MOS tubes U3, and the fourth output port of the main driver chip U1 outputting the GHB signal is connected to the G2 pole of the second group of N-MOS tubes U3; the D1 pole of the first group of N-MOS tubes U2 is connected to the S1 pole of the second group of N-MOS tubes U3 and outputs the first sequential drive signal DRV-A, the D2 pole of the first group of N-MOS tubes U2 is connected to the S2 pole of the second group of N-MOS tubes U3 and outputs the second sequential drive signal DRV-B, the first sequential drive signal DRV-A and the second sequential drive signal DRV-B are used to control the movement of the linear motor; the D1 pole and D2 pole of the second group of N-MOS tubes U3 are connected to the power module, and the S1 pole and S2 pole of the first group of N-MOS tubes U2 are grounded. Figure 6 In the embodiment, a first capacitor C56 is connected in parallel between the S1 electrode and the D1 electrode of the first group of N-MOS transistors U2, a second capacitor C62 is connected in parallel between the S2 electrode and the D2 electrode of the first group of N-MOS transistors U2, one end of a third capacitor C57 is respectively connected to the D1 electrode of the first group of N-MOS transistors U2 and the S1 electrode of the second group of N-MOS transistors U3, and the other end of the third capacitor C57 is grounded via a resistor R33. One end of a fourth capacitor C63 is respectively connected to the D2 electrode of the first group of N-MOS transistors U2 and the S2 electrode of the second group of N-MOS transistors U3, and the other end of the fourth capacitor C63 is grounded via a resistor R38.

[0053] The main driver chip U1 generates four high and low pre-drive signals GLA, GHA, GLB and GHB for the linear motor A and B phases according to the SPWM signal output by the signal processing circuit unit. The four pre-drive signals are connected and controlled to turn on and off the switches of two groups of N-MOS tubes in the H-bridge drive circuit in a specific order, thereby generating a sequential drive signal for controlling the movement of the linear motor. Since the voltage and current of the motor are relatively large, it is easy to generate some large electromagnetic interference during operation. Therefore, a filter circuit is also designed in the present invention, which is arranged between the power drive unit and the refrigerator linear motor for filtering and isolation.

[0054] A common noise filter is a low-pass filter composed of inductors and capacitors, which significantly attenuates high-frequency signals and interference signals. The present invention constructs a passive network of inductors and capacitors that utilizes the principle of impedance mismatch to attenuate electromagnetic interference signals. The filter's effectiveness depends on the degree of impedance mismatch; the greater the impedance difference (the greater the mismatch), the better the filter's effectiveness. To achieve optimal filtering, a filter with high input impedance should be used for a low-impedance power source, while a filter with low input impedance should be used for a high-input impedance load.

[0055] In an embodiment of the present invention, the filter circuit is as follows: Figure 7 As shown, it mainly includes a first inductor L3 and a second inductor L4. One end of the first inductor L3 and one end of the second inductor L4 are respectively connected to the main driver chip U1 to receive the DRV-A signal and the DRV-B signal respectively. DRV-A and DRV-B are sequential drive signals output by the drive circuit. The other ends of the first inductor L3 and the second inductor L4 are respectively connected to the A and B phases of the linear motor. The first inductor L3 and the second inductor L4 filter the modulated SPWM signal, which is equivalent to a sinusoidal signal and output to the linear motor to control the movement of the linear motor. Figure 7 A_OUT and B_OUT are the motor drive sinusoidal wave signals corresponding to linear motors A and B. A plurality of capacitors (C42, C43, C44) are connected in parallel between the other end of the first inductor L3 and the other end of the second inductor L4.

[0056] The controller of the present invention has the functions of motor driving, steady speed control, temperature detection, circuit protection and the like.

[0057] Example 2

[0058] This embodiment introduces an integrated design method for a small hybrid integrated drive controller for a linear Stirling refrigerator. The unit circuit structures of the drive controller are tightly arranged on a PCB board. In order to save space as much as possible, the circuit adopts a double-sided assembly design of the PCB board. The main active devices use bare cores, and all chip resistors and capacitors inside the circuit adopt a soldering process. At the same time, in order to dissipate heat from the drive circuit, all power N-MOS tubes of the drive circuit are soldered on the PCB board, and a heat dissipation design is performed on the back of the PCB board by using thermal grease to cling to the metal shell of the controller. This ensures the heat conduction efficiency and meets the insulation distance. The PCB board layout structure of the drive controller is roughly as follows: Figure 8 As shown, in actual production, it is not necessary to follow Figure 7 Typesetting can be flexible.

[0059] The integrated drive controller circuit is small in size, light in weight, and low in cost. Its dimensions are approximately (28mm±0.3mm)×(28mm±0.3mm)×(15mm±0.5mm), the PCB board thickness is 2mm±0.2mm, and the single board weight is ≤20g, achieving circuit miniaturization.

[0060] The drive controller of the present invention detects the feedback voltage signal from the refrigerator's cold-end temperature-measuring diode. The signal processing circuit then outputs a sinusoidal pulse-width modulated signal to the power drive unit for decoding, generating a sinusoidal motor-driving signal to control the refrigerator's internal motor, ensuring stable operation and control. A segmented PID algorithm is employed in the signal processing circuit unit to output a real-time adjustable SPWM signal, improving the real-time performance and accuracy of the drive control. In the power drive unit, the drive circuit generates two timing signals, controlling the N-MOS transistors in the drive circuit to conduct sequentially according to a specific timing sequence, achieving motor drive control and achieving the motor drive and speed control functions.

[0061] The controller of the present invention is powered by a 12V DC voltage, and the circuit has an electromagnetic compatibility design. It can output 5.5V and 3.3V power supplies, and can also provide a 1000μA constant current source, which can effectively match the needs of different devices.

[0062] The controller of the present invention is composed of analog components such as a microprocessor, a triode, an N-MOS tube, an inductor, a resistor and a capacitor. It has a simple circuit structure, clear functional logic, high working reliability, universal material selection, and easy debugging. While ensuring the design function, it uses a small number of components, has a small circuit size, light weight, and low cost, and realizes circuit miniaturization, integration, and national production.

[0063] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which are all protected by the present invention.

Claims

1. A small hybrid integrated drive controller for a linear Stirling refrigerator, characterized in that: include: A signal processing circuit unit is used to generate a sinusoidal pulse width modulation signal using a segmented PID control algorithm according to an output signal of a temperature measuring diode of the linear Stirling refrigerator; The power drive unit is used to generate a motor driving sinusoidal wave signal by decoding a sinusoidal pulse width modulation signal to control the movement of the motor inside the linear Stirling refrigerator.

2. The small hybrid integrated drive controller for a linear Stirling refrigerator according to claim 1, characterized in that: The signal processing circuit unit includes a power supply module, a main control processing unit, a signal acquisition module and an analog-to-digital converter; The power supply module provides power to other modules; the signal acquisition module is connected to the temperature measuring diode at the cold end of the linear Stirling refrigerator to collect the feedback voltage signal output by the temperature measuring diode; the analog-to-digital converter converts the feedback voltage signal into a digital signal and inputs it into the main control processing unit; the main control processing module compares the temperature measuring voltage of the temperature measuring diode with the preset temperature control point voltage, and uses a segmented PID control algorithm to generate a corresponding sinusoidal pulse width modulation signal based on the difference between the two.

3. The small hybrid integrated drive controller for a linear Stirling refrigerator according to claim 1, characterized in that: The signal processing circuit unit is specifically used for: Calculate the error e(k) based on the temperature measurement voltage V1 of the temperature measurement diode and the preset temperature control point voltage V2; Obtain the error range based on the historical temperature control data, divide the error range into multiple intervals, and set a PID parameter for each error interval; The corresponding PID parameters are obtained according to the error interval corresponding to the error e(k), and the output pulse duty cycle is calculated according to the error e(k) and the PID parameters; Generates a corresponding sinusoidal pulse width modulation signal according to the output pulse duty cycle.

4. The small hybrid integrated drive controller for a linear Stirling refrigerator according to claim 2, characterized in that: The power supply module includes an input power supply and a step-down circuit. The input power supply inputs a 12V supply voltage, and generates 5.5V and 3.3V DC voltages respectively through the step-down circuit.

5. The small hybrid integrated drive controller for a linear Stirling refrigerator according to claim 4, characterized in that: The power module uses a 3.3V power supply terminal to build a 1000μA constant current source circuit for matching and driving the temperature measuring diode inside the linear Stirling refrigerator.

6. The small hybrid integrated drive controller for a linear Stirling refrigerator according to claim 5, characterized in that: The constant current source circuit includes a first resistor, a second resistor, an operational amplifier, a third resistor and a fourth resistor. One end of the first resistor is connected to a 3.3V power supply, the other end of the first resistor is respectively connected to one end of the second resistor and one end of the third resistor, the other end of the second resistor is connected to the non-inverting input of the operational amplifier, the inverting input of the operational amplifier is connected to the output of the operational amplifier through the fourth resistor, and the output of the operational amplifier is also connected to the other end of the third resistor, outputting a constant current source of 1000μA.

7. The small hybrid integrated drive controller for a linear Stirling refrigerator according to claim 1, characterized in that: The power drive unit includes a main drive chip and an H-bridge drive circuit, wherein the H-bridge drive circuit includes a first group of N-MOS transistors, a second group of N-MOS transistors, a plurality of capacitors for filtering, and a TVS diode for protecting the circuit, wherein each group of N-MOS transistors includes at least two N-MOS transistors; The first output port of the main driver chip is connected to the G1 pole of the first group of N-MOS tubes, the second output port of the main driver chip is connected to the G2 pole of the first group of N-MOS tubes, the third output port of the main driver chip is connected to the G1 pole of the second group of N-MOS tubes, and the fourth output port of the main driver chip is connected to the G2 pole of the second group of N-MOS tubes; the D1 pole of the first group of N-MOS tubes is connected to the S1 pole of the second group of N-MOS tubes and outputs a first sequential drive signal DRV-A, the D2 pole of the first group of N-MOS tubes is connected to the S2 pole of the second group of N-MOS tubes and outputs a second sequential drive signal DRV-B, and the first sequential drive signal DRV-A and the second sequential drive signal DRV-B are used to control the movement of the motor inside the linear Stirling refrigerator; the D1 pole and D2 pole of the second group of N-MOS tubes are connected to the power module, and the S1 pole and S2 pole of the first group of N-MOS tubes are grounded.

8. The small hybrid integrated drive controller for a linear Stirling refrigerator according to claim 7, characterized in that: The main driver chip calculates the sinusoidal pulse width modulation signal output by the signal processing circuit unit to obtain the motor commutation logic, and generates four high and low pre-drive signals for the linear motor phases A and B, which are respectively recorded as the A-phase low-level pre-drive signal GLA, the A-phase high-level pre-drive signal GHA, the B-phase low-level pre-drive signal GLB and the B-phase high-level pre-drive signal GHB; the main driver chip is connected and controls the switches of the two groups of N-MOS tubes in the H-bridge drive circuit to be turned on and off in a specific order through the GLA, GHA, GLB and GHB signals.

9. The small hybrid integrated drive controller for a linear Stirling refrigerator according to claim 7, characterized in that: The drive controller includes a filter circuit, which includes a first inductor and a second inductor; one end of the first inductor and one end of the second inductor are respectively connected to the power drive unit, for receiving the DRV-A signal and the DRV-B signal output by the power drive unit; the other ends of the first inductor and the second inductor are respectively connected to the A and B phases of the linear motor in the linear Stirling refrigerator, providing the linear motor with a motor drive sinusoidal wave signal; A plurality of capacitors for filtering are connected in parallel between the other end of the first inductor and the other end of the second inductor.

10. An integrated design method for a small hybrid integrated drive controller for a linear Stirling refrigerator based on claim 1, characterized in that: include: The circuits of each unit of the small hybrid integrated drive controller for a linear Stirling refrigerator are arranged on both sides of a PCB. Bare cores are used for active devices, and all chip resistors and capacitors within the circuit are soldered. The N-MOS transistors within the power drive unit are soldered to the PCB, and heat dissipation is achieved by applying thermal grease to the back of the PCB, which is in close contact with the metal casing of the controller.

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