CN108317786B - Control circuit of Stirling refrigerator - Google Patents

Control circuit of Stirling refrigerator Download PDF

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Publication number
CN108317786B
CN108317786B CN201711444229.4A CN201711444229A CN108317786B CN 108317786 B CN108317786 B CN 108317786B CN 201711444229 A CN201711444229 A CN 201711444229A CN 108317786 B CN108317786 B CN 108317786B
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resistor
capacitor
circuit
twenty
chip
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CN108317786A (en
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温建国
陈晓月
王明鑫
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CETC 11 Research Institute
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CETC 11 Research Institute
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop

Abstract

According to the control circuit of the Stirling refrigerator, the direct-current power supply conversion circuit is connected with the main driving circuit, the temperature setting circuit, the filtering and reverse connection protection circuit, the temperature measurement feedback circuit, the Hall power supply circuit and the feedback comparison circuit; the main driving circuit is connected with the feedback comparison circuit, the power bridge driving circuit and the filtering and reverse connection protection circuit; the temperature setting circuit is connected with the feedback comparison circuit, the Hall power supply circuit and the temperature measurement feedback circuit; the temperature measurement feedback circuit is connected with the feedback comparison circuit; the Hall feedback filter circuit is connected with the main drive circuit, the direct-current power supply conversion circuit and a Hall sensor of the Stirling refrigerator; the Hall power supply circuit is connected with a Hall sensor of the Stirling refrigerator; the overcurrent protection circuit is connected with the power bridge drive circuit, the main drive circuit and the filtering and reverse connection protection circuit; and the power bridge driving circuit is connected with a three-phase winding of the Stirling refrigerator.

Description

Control circuit of Stirling refrigerator
Technical Field
The invention relates to the field of infrared detectors, in particular to a control circuit of a Stirling refrigerator.
Background
An infrared detector with a large area array is a semiconductor imaging device with high sensitivity to temperature, and usually works in a stable low-temperature environment provided by a Stirling refrigerator to achieve the optimal infrared imaging effect, so that a high-quality infrared image is obtained.
The control circuit of the existing Stirling refrigerator is small in power which can be output by a power output circuit for driving the refrigerator to operate, so that cold energy which cannot be generated by the Stirling refrigerator provides a suitable working environment for stable work of a large-area-array infrared detector, and in the control circuit of the existing Stirling refrigerator, a power conversion circuit of the control circuit of the Stirling refrigerator mainly adopts a low dropout regulator (LDO) to perform direct current conversion, the circuit heat dissipation capacity is large, and therefore the efficiency of the power conversion circuit is not high, and the efficiency of the whole control circuit is influenced.
Disclosure of Invention
The invention provides a control circuit of a Stirling refrigerator, which is used for solving the following problems in the prior art: the control circuit of the existing Stirling refrigerator is not suitable for controlling the Stirling refrigerator which can provide the required cold quantity for the stable work of the large-area array infrared detector.
In order to solve the above technical problem, the present invention provides a control circuit of a stirling cryocooler, comprising: the device comprises a Hall power supply circuit, a filtering and reverse connection protection circuit, a direct current power supply conversion circuit, a temperature setting circuit, a temperature measurement feedback circuit, a Hall feedback filter circuit, a feedback comparison circuit, a main drive circuit, an overcurrent protection circuit and a power bridge drive circuit; the Hall power supply circuit is connected with the direct-current power supply conversion circuit and a Hall sensor of the Stirling refrigerator; the filtering and reverse connection protection circuit is connected with the direct-current power supply conversion circuit and the main driving circuit; the direct-current power supply conversion circuit is connected with the main drive circuit, the temperature setting circuit, the temperature measurement feedback circuit and the feedback comparison circuit; the main driving circuit is connected with the feedback comparison circuit and the power bridge driving circuit; the temperature setting circuit is connected with the feedback comparison circuit, the Hall power supply circuit and the temperature measurement feedback circuit; the temperature measurement feedback circuit is connected with the feedback comparison circuit; the Hall feedback filter circuit is connected with the main drive circuit, the direct-current power supply conversion circuit and a Hall sensor of the Stirling refrigerator; the overcurrent protection circuit is connected with the power bridge drive circuit, the main drive circuit and the filtering and reverse connection protection circuit; and the power bridge driving circuit is connected with a three-phase winding of the Stirling refrigerator.
Optionally, the dc power conversion circuit includes: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first switching tube, a first preset chip and a transformer; one end of the first resistor is connected with one end of the first capacitor, the other end of the first resistor is connected with the first port of the first predetermined chip, the other end of the first capacitor is connected with one end of the second capacitor, the other end of the second capacitor is connected with the second port of the first predetermined chip, one end of the third capacitor is connected with one end of the second resistor, one end of the second resistor is grounded, the other end of the third capacitor is connected with the third port of the first predetermined chip, and the other end of the second resistor is connected with the fourth port of the first predetermined chip; one end of the third resistor is connected with the fifth port of the first preset chip, the other end of the third resistor is connected with the sixth port of the first preset chip, the grid electrode of the first switch tube is connected with the seventh port of the first preset chip, the source electrode of the first switch tube is connected with one end of the fourth resistor and the eighth port of the first preset chip, the other end of the fourth resistor is connected with the ninth port of the first preset chip, the ninth port is grounded, the drain electrode of the switch tube is connected with one end of the primary side of the transformer, and the other end of the primary side of the transformer is connected with the tenth port of the first preset chip; the first end of the secondary side of the transformer is connected with one end of a fifth capacitor, the input end of the main driving circuit and the input end of the Hall power supply circuit, the other end of the fifth capacitor is grounded, the second end of the secondary side of the transformer is connected with one end of a fourth capacitor, one end of a fifth resistor, the input end of the temperature setting circuit, the input end of the temperature measurement feedback circuit and the input end of the feedback comparison circuit, the other end of the fourth capacitor is grounded, the other end of the fifth resistor is connected with one end of a sixth resistor, the other end of the sixth resistor is connected with the third end of the secondary side of the transformer, and the third end of the sixth resistor is grounded.
Optionally, the main driving circuit includes: the circuit comprises a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a first diode and a second predetermined chip; wherein a cathode of the first diode is connected to an output terminal of the feedback comparison circuit, an anode of the first diode is connected to one end of the seventh resistor, one end of the tenth capacitor, and a first port of the second predetermined chip, the other end of the seventh resistor is connected to one end of the eighth resistor and a second port of the second predetermined chip, the other end of the eighth resistor is connected to a third port of the second predetermined chip, one end of the ninth capacitor, and one end of the tenth resistor, the other end of the tenth resistor is connected to one end of the eleventh resistor, one end of the eleventh resistor is grounded, the other end of the eleventh resistor is connected to a fourth port of the second predetermined chip and one end of the ninth resistor, and the other end of the ninth resistor is connected to one end of the eighth capacitor and a fifth port of the second predetermined chip, the other end of the eighth capacitor, the other end of the ninth capacitor and the other end of the tenth capacitor are grounded, one end of the twelfth resistor is connected to the sixth port of the second predetermined chip, the other end of the twelfth resistor is grounded, one end of the thirteenth resistor is connected to the seventh port of the second predetermined chip, the other end of the thirteenth resistor is grounded, one end of the sixth capacitor is connected to the eighth port of the second predetermined chip, the other end of the sixth capacitor is grounded, one end of the fourteenth resistor is connected to one end of the sixteenth resistor, one end of the seventh capacitor and the ninth port of the second predetermined chip, the other end of the fourteenth resistor is grounded, and the other end of the sixteenth resistor is connected to one end of the fifteenth resistor, the other end of the seventh capacitor and the tenth port of the second predetermined chip, the other end of the fifteenth resistor is grounded.
Optionally, the temperature setting circuit includes: the voltage reference source, the predetermined resistance network, the potentiometer, the eleventh capacitor and the first predetermined operational amplifier; an input end of the voltage reference source is connected to a second end of the secondary side of the transformer of the dc power conversion circuit, an output end of the voltage reference source is connected to a first end of the predetermined resistor network, a third end of the predetermined resistor network is connected to a ground end of the voltage reference source, the ground end of the voltage reference source is grounded, a second end of the predetermined resistor network is connected to a first end of the potentiometer, a fourth end of the predetermined resistor network is connected to a second end of the potentiometer, a third end of the potentiometer is connected to one end of the eleventh capacitor and a non-inverting input end of the first predetermined operational amplifier, another end of the eleventh capacitor is grounded, an inverting input end of the first predetermined operational amplifier is connected to an output end of the first predetermined operational amplifier, and a positive power source end of the first predetermined operational amplifier is connected to a second end of the secondary side of the transformer of the dc power conversion circuit And then, the negative power supply end of the first predetermined operational amplifier is grounded.
Optionally, the filtering and reverse-connection protection circuit includes: the second diode, the first inductor, the second inductor, the twelfth capacitor, the thirteenth capacitor, the fourteenth capacitor, the fifteenth capacitor, the sixteenth capacitor and the magnetic bead; the anode of the second diode is positively charged, the cathode of the second diode is connected to one end of the first inductor, the other end of the first inductor is connected to one end of the twelfth capacitor and the first end of the second inductor, the other end of the twelfth capacitor is negatively charged, the other end of the twelfth capacitor is connected to the second end of the second inductor, the third end of the second inductor is connected to one end of the thirteenth capacitor, one end of the fourteenth capacitor, one end of the fifteenth capacitor and one end of the magnetic bead, the fourth end of the second inductor is connected to the other end of the thirteenth capacitor, the other end of the fourteenth capacitor and the other end of the fifteenth capacitor are grounded, and the other end of the magnetic bead is connected to one end of the sixteenth capacitor, the first predetermined chip of the dc power conversion circuit and the input end of the main driving circuit And the other end of the sixteenth capacitor is grounded.
Optionally, the power bridge driving circuit includes: a third predetermined chip, a fourth predetermined chip, a fifth predetermined chip, a seventeenth capacitor, an eighteenth capacitor, a nineteenth capacitor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, a sixth switching tube, a seventh switching tube, a third diode, a fourth diode and a fifth diode; the third preset chip is connected with the first preset chip of the main driving circuit, one end of a seventeenth capacitor is connected with a first port of the third preset chip, the other end of the seventeenth capacitor is connected with a second port of the third preset chip, a source electrode of the second switching tube, a drain electrode of the third switching tube and an input end of the third diode, one end of a seventeenth resistor is connected with a third port of the third preset chip, the other end of the seventeenth resistor is connected with a grid electrode of the second switching tube, the drain electrode of the second switching tube is applied with voltage, one end of an eighteenth resistor is connected with a fourth port of the third preset chip, the other end of the eighteenth resistor is connected with the grid electrode of the third switching tube, and the source electrode of the third switching tube is grounded; the fourth preset chip is connected with the first preset chip of the main driving circuit, one end of an eighteenth capacitor is connected with a first port of the fourth preset chip, the other end of the eighteenth capacitor is connected with a second port of the fourth preset chip, a source electrode of the fourth switching tube, a drain electrode of the fifth switching tube and an input end of the fourth diode, one end of a nineteenth resistor is connected with a third port of the third preset chip, the other end of the nineteenth resistor is connected with a grid electrode of the fourth switching tube, the drain electrode of the fourth switching tube is applied with voltage, one end of a twentieth resistor is connected with a fourth port of the fourth preset chip, the other end of the twentieth resistor is connected with the grid electrode of the fifth switching tube, and the source electrode of the fifth switching tube is grounded;
the fifth preset chip is connected with the first preset chip of the main driving circuit, one end of a nineteenth capacitor is connected with a first port of the fifth preset chip, the other end of the nineteenth capacitor is connected with a second port of the fifth preset chip, a source electrode of the sixth switching tube, a drain electrode of the seventh switching tube and an input end of a fifth diode, one end of a twenty-first resistor is connected with a third port of the fifth preset chip, the other end of the twenty-first resistor is connected with a grid electrode of the sixth switching tube, the drain electrode of the sixth switching tube is applied with voltage, one end of a twenty-second resistor is connected with a fourth port of the fifth preset chip, the other end of the twenty-second resistor is connected with the grid electrode of the seventh switching tube, and the source electrode of the seventh switching tube is grounded.
Optionally, the temperature measurement feedback circuit includes: the temperature measuring circuit comprises a preset temperature measuring element, a third inductor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a twentieth capacitor, a twenty-first capacitor, a twenty-second capacitor and a second preset operational amplifier; wherein the positive electrode of the predetermined temperature measuring element is connected with the first end of the third inductor, the negative electrode of the predetermined temperature measuring element is connected with the second end of the third inductor, one end of the twenty-third resistor is connected with the second end of the secondary side of the transformer, the other end of the twenty-third resistor is connected with the third end of the third inductor, one end of the twentieth capacitor and one end of the twenty-fifth resistor, the other end of the twentieth capacitor is connected with the fourth end of the third inductor, one end of the twenty-fourth resistor and one end of the twenty-sixth resistor, the other end of the twenty-fourth resistor is grounded, the other end of the twenty-fifth resistor is connected with one end of the twenty-first capacitor and the first end of the second predetermined operational amplifier, the other end of the twenty-sixth resistor is connected with one end of the twenty-second capacitor and the second end of the second predetermined operational amplifier, the other end of the twenty-first capacitor is connected with the other end of the twenty-second capacitor, the third end of the second preset operational amplifier and the fourth end of the second preset operational amplifier, the third end of the second preset operational amplifier is grounded, one end of the twenty-seventh resistor is connected with the fifth end of the second preset operational amplifier, the other end of the twenty-seventh resistor is connected with the sixth end of the second preset operational amplifier and the input end of the feedback comparison circuit, and the seventh end of the second preset operational amplifier is connected with the second end of the secondary side of the transformer.
Optionally, the feedback comparison circuit includes: a twenty-eighth resistor, a twenty-ninth resistor, a thirty-sixth resistor, a thirty-eleventh resistor, a thirty-second resistor, a thirty-third resistor, a twenty-third capacitor, a twenty-fourth capacitor, a twenty-fifth capacitor, a third predetermined operational amplifier, a fourth predetermined operational amplifier and a sixth predetermined chip; wherein one end of the twenty-eighth resistor is connected to the output end of the temperature setting circuit, the other end of the twenty-eighth resistor is connected to one end of the twenty-ninth resistor and the non-inverting input end of the third predetermined operational amplifier, the inverting input end of the third predetermined operational amplifier is connected to the sixth end of the second predetermined operational amplifier of the temperature measurement feedback circuit, the other end of the twenty-ninth resistor is connected to the output end of the third predetermined operational amplifier and the sixth predetermined chip, one end of the thirty resistor is connected to the output end of the first predetermined operational amplifier of the temperature setting circuit, the other end of the thirty resistor is connected to one end of the twenty-third capacitor and the non-inverting input end of the fourth operational amplifier, and the other end of the twenty-third capacitor is grounded, one end of the thirty-first resistor is connected with the sixth preset chip, the other end of the thirty-first resistor is connected with one end of the twenty-fourth capacitor and one end of the thirty-third resistor, one end of the thirty-second resistor is connected with the sixth end of the second preset operational amplifier of the temperature measurement feedback circuit, the other end of the thirty-second resistor is connected with the inverting input end of the fourth preset operational amplifier, the other end of the thirty-third resistor and one end of the twenty-fifth capacitor, and the output end of the fourth preset operational amplifier is connected with the other end of the twenty-fourth capacitor, the other end of the twenty-fifth capacitor and the sixth preset chip.
According to the control circuit of the Stirling refrigerator, the direct-current power supply conversion circuit is connected with the main driving circuit, the temperature setting circuit, the filtering and reverse connection protection circuit, the temperature measurement feedback circuit, the Hall power supply circuit and the feedback comparison circuit; the main driving circuit is connected with the feedback comparison circuit, the power bridge driving circuit and the filtering and reverse connection protection circuit; the temperature setting circuit is connected with the feedback comparison circuit, the Hall power supply circuit and the temperature measurement feedback circuit; the temperature measurement feedback circuit is connected with the feedback comparison circuit; the Hall feedback filter circuit is connected with the main drive circuit, the direct-current power supply conversion circuit and a Hall sensor of the Stirling refrigerator; the Hall power supply circuit is connected with a Hall sensor of the Stirling refrigerator; the overcurrent protection circuit is connected with the power bridge drive circuit, the main drive circuit and the filtering and reverse connection protection circuit; and the power bridge driving circuit is connected with a three-phase winding of the Stirling refrigerator.
In the circuit, an external power supply supplies power to a filtering and reverse protection circuit, the output of the circuit is used as the input of a direct-current power supply conversion circuit and a main driving circuit, the output of the direct-current power supply conversion circuit is used as the input of a Hall power supply circuit, the output of the Hall power supply circuit provides proper working voltage for a Hall sensor of the Stirling refrigerator, and when the voltage value measured by a temperature measuring element in a temperature measuring feedback circuit is smaller than a set level value, the Stirling refrigerator works at full speed to rapidly cool; when the voltage value measured by the temperature measurement feedback circuit is close to a set level value, the voltage value set by the temperature control setting circuit is compared with the voltage value obtained by the temperature measurement feedback circuit, the voltage value is output as a control level through the feedback comparison circuit, the level is input into the main driving circuit to be compared with a triangular wave generated by the main driving circuit, the main driving circuit outputs a Pulse Width Modulation (PWM) wave, the PWM wave is used as the input of the power bridge driving circuit, and the power is output to a three-phase winding of the Stirling refrigerator through the power bridge driving circuit so as to control the Stirling refrigerator to adjust the rotating speed, thereby controlling the output power of the Stirling refrigerator. The following problems in the prior art are solved: the control circuit of the existing Stirling refrigerator is not suitable for controlling the Stirling refrigerator which can provide the required cold quantity for the stable work of the large-area array infrared detector.
Drawings
FIG. 1 is a schematic diagram of the construction of the control circuit of a Stirling cryocooler in an embodiment of the present invention;
FIG. 2 is a circuit diagram of a DC power conversion circuit according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of a main drive circuit in an embodiment of the present invention;
FIG. 4 is a circuit diagram of a temperature setting circuit in an embodiment of the present invention;
FIG. 5 is a circuit diagram of a filtering and reverse-blocking protection circuit in an embodiment of the present invention;
FIG. 6 is a test chart of RE102 electromagnetic compatibility of the prior art filtering and reverse-protection circuit;
FIG. 7 is a CE102 electromagnetic compatibility test chart of a prior art filtering and reverse-protection circuit;
FIG. 8 is a diagram illustrating the performance of the RE102 in the filter and reverse protection circuit according to an embodiment of the present invention;
FIG. 9 is a CE102 electromagnetic compatibility test chart of the filtering and reverse-connection protection circuit in the embodiment of the present invention;
FIG. 10 is a circuit diagram of a power bridge driver circuit in an embodiment of the present invention;
FIG. 11 is a circuit diagram of a thermometry feedback circuit in an embodiment of the present invention;
FIG. 12 is a circuit diagram of a feedback comparison circuit in an embodiment of the present invention;
fig. 13 is a circuit diagram of an overcurrent protection circuit in an embodiment of the invention;
FIG. 14 is a circuit diagram of a Hall power supply circuit in an embodiment of the invention;
fig. 15 is a circuit diagram of a hall feedback filter circuit in an embodiment of the present invention.
Detailed Description
In order to solve the following problems in the prior art: the control circuit of the existing Stirling refrigerator is not suitable for controlling the Stirling refrigerator which can provide the required cold quantity for the stable work of the large-area array infrared detector. The present embodiment provides a control circuit of a stirling cryocooler, the structural schematic diagram of the circuit is shown in fig. 1, and the control circuit includes: the device comprises a Hall power supply circuit, a filtering and reverse connection protection circuit, a direct current power supply conversion circuit, a temperature setting circuit, a temperature measurement feedback circuit, a Hall feedback filter circuit, a feedback comparison circuit, a main drive circuit, an overcurrent protection circuit and a power bridge drive circuit.
The Hall power supply circuit is connected with the direct-current power supply conversion circuit and a Hall sensor of the Stirling refrigerator; the filtering and reverse connection protection circuit is connected with the direct-current power supply conversion circuit and the main drive circuit; the direct-current power supply conversion circuit is connected with the main drive circuit, the temperature setting circuit, the temperature measurement feedback circuit and the feedback comparison circuit; the main driving circuit is connected with the feedback comparison circuit and the power bridge driving circuit; the temperature setting circuit is connected with the feedback comparison circuit, the Hall power supply circuit and the temperature measurement feedback circuit; the temperature measurement feedback circuit is connected with the feedback comparison circuit; the Hall feedback filter circuit is connected with the main drive circuit, the direct-current power supply conversion circuit and a Hall sensor of the Stirling refrigerator; the overcurrent protection circuit is connected with the power bridge drive circuit, the main drive circuit and the filtering and reverse connection protection circuit; and the power bridge driving circuit is connected with a three-phase winding of the Stirling refrigerator.
As shown in fig. 2, the circuit diagram of the dc power conversion circuit includes: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C6, a second capacitor C7, a third capacitor C8, a fourth capacitor C9, a fifth capacitor C10, a first switch tube Q11, a first predetermined chip U1 and a transformer T1.
In this embodiment, the dc power conversion circuit is specifically connected as follows: one end of a first resistor is connected with one end of a first capacitor, the other end of the first resistor is connected with a first port (COMP) of a first preset chip, the other end of the first capacitor is connected with one end of a second capacitor, the other end of the second capacitor is connected with a second port (FB) of the first preset chip, one end of a third capacitor is connected with one end of a second resistor, one end of the second resistor is grounded, the other end of the third capacitor is connected with a third port (VREF) of the first preset chip, and the other end of the second resistor is connected with a fourth port (BIAS) of the first preset chip;
one end of a third resistor is connected with a fifth port (OSCOUT) of a first preset chip, the other end of the third resistor is connected with a sixth port (OSCIN) of the first preset chip, the grid electrode of a first switch tube is connected with a seventh port (OUTPUT) of the first preset chip, the source electrode of the first switch tube is connected with one end of a fourth resistor and an eighth port (SENSE) of the first preset chip, the other end of the fourth resistor is connected with a ninth port (DISCHARGE) of the first preset chip, the ninth port is grounded, the drain electrode of the switch tube is connected with one end of the primary side of a transformer, and the other end of the primary side of the transformer is connected with a tenth port (+ VIN) of the first preset chip;
the first end of the secondary side of the transformer is connected with one end of a fifth capacitor, the input end of a main driving circuit and the input end of a Hall power supply circuit, the other end of the fifth capacitor is grounded, the second end of the secondary side of the transformer is connected with one end of a fourth capacitor, one end of a fifth resistor, the input end of a temperature setting circuit, the input end of a temperature measurement feedback circuit and the input end of a feedback comparison circuit, the other end of the fourth capacitor is grounded, the other end of the fifth resistor is connected with one end of a sixth resistor, the other end of the sixth resistor is connected with the third end of the secondary side of the transformer, and the third end of the secondary side of the transformer is.
In this embodiment, when the dc power conversion circuit is powered on, the voltage VCC generated at the first end of the secondary side of the transformer can supply power to the circuit itself, and can be used as the input of the hall power supply circuit and the main driving circuit. The other output voltage VS at the second end of the secondary side of the transformer is a tap of the secondary side of the transformer in specific implementation, and the VS can be used as the input of the temperature setting circuit, the temperature measurement feedback circuit and the feedback comparison circuit. The direct-current power supply conversion circuit in the embodiment adopts the efficient direct-current conversion chip and adopts the mode of arranging the transformer on the circuit board, so that the efficiency of direct-current power supply conversion can be obviously improved.
The circuit diagram of the main driving circuit in this embodiment is shown in fig. 3, and includes: a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R161, a sixth capacitor C11, a seventh capacitor C12, an eighth capacitor C13, a ninth capacitor C14, a tenth capacitor C15, a first diode D2 and a second predetermined chip U10;
the specific connection mode of the main driving circuit is as follows: the cathode of the first diode is connected with the output end of the feedback comparison circuit, the anode of the first diode is connected with one end of the seventh resistor, one end of the tenth capacitor and the first port (PWM _ I) of the second predetermined chip, the other end of the seventh resistor is connected with one end of the eighth resistor and the second port (VREF) of the second predetermined chip, the other end of the eighth resistor is connected with the third port (OC _ REF) of the second predetermined chip, one end of the ninth capacitor and one end of the tenth resistor, the other end of the tenth resistor is connected with one end of the eleventh resistor, one end of the eleventh resistor is grounded, the other end of the eleventh resistor is connected with the fourth port (PWM _ NI) of the second predetermined chip and one end of the ninth resistor, the other end of the ninth resistor is connected with one end of the eighth capacitor and the fifth port (CT) of the second predetermined chip, and the other end of the eighth capacitor is connected with the third port (PWM _ NI) of, The other end of the ninth capacitor and the other end of the tenth capacitor are grounded, one end of the twelfth resistor is connected with the sixth port (BRAKE) of the second predetermined chip, the other end of the twelfth resistor is grounded, one end of the thirteenth resistor is connected with the seventh port (R _ TACH) of the second predetermined chip, the other end of the thirteenth resistor is grounded, one end of the sixth capacitor is connected with the eighth port (C _ TACH) of the second predetermined chip, the other end of the sixth capacitor is grounded, one end of the fourteenth resistor is connected with one end of the sixteenth resistor, one end of the seventh capacitor and the ninth port (SNS _ NI) of the second predetermined chip, the other end of the fourteenth resistor is grounded, the other end of the sixteenth resistor is connected with one end of the fifteenth resistor, the other end of the seventh capacitor and the tenth port (SNS _ I) of the second predetermined chip, and the other end of the fifteenth resistor is grounded.
In addition, a hall port and a hall port in the U10 are connected with the output of the hall feedback filter circuit, a VDD port is connected with a VCC port of a transformer secondary side output of the direct-current power supply conversion circuit, an AHI port, an ALO port, a BHI port, a BLOW port, a CHI port and a CLOW port are respectively connected with corresponding input ends of the power bridge output circuit, and the R14, the R15, the R161 and the C12 form a current sampling circuit together with the overcurrent protection circuit, so that the U10 stops working when the working current exceeds a designed value, and the effect of the protection circuit is achieved.
In this embodiment, as shown in fig. 4, the circuit diagram of the temperature setting circuit includes: a voltage reference source A1, a predetermined resistor network Z, a potentiometer VR1, an eleventh capacitor C21 and a first predetermined operational amplifier A2A;
the specific connection mode of the temperature setting circuit is as follows: the input end of the voltage reference source is connected with the second end of the secondary side output voltage VS of the transformer of the direct-current power supply conversion circuit, the output end of the voltage reference source is connected with the first end of the preset resistance network, the third end of the preset resistance network is connected with the grounding end of the voltage reference source, the grounding end of the voltage reference source is grounded, the second end of the preset resistance network is connected with the first end of the potentiometer, the fourth end of the preset resistance network is connected with the second end of the potentiometer, the third end of the potentiometer is connected with one end of the eleventh capacitor and the non-inverting input end of the first preset operational amplifier, the other end of the eleventh capacitor is grounded, the inverting input end of the first preset operational amplifier is connected with the output end of the first preset operational amplifier, the positive power source end of the first preset operational amplifier is connected with the second end of the secondary side output voltage VS of the transformer of the direct-current power supply.
The VS voltage provided by the direct-current power supply conversion circuit is used as input of the temperature setting circuit, the voltage reference source is converted and is adjusted through the passive resistance network Z and the potentiometer VR1, VIN2 output by the output end of the first preset operational amplifier is connected into the feedback comparison circuit, the temperature setting circuit of the embodiment adopts the high-precision voltage reference source, and can output voltage with good stability and precision, so that the precision of the voltage value output by the circuit is high, the sensitivity is good, and the setting of the working temperature of the Stirling refrigerator can be more accurate.
The circuit diagram of the filter and reverse protection circuit in this embodiment is shown in fig. 5, and includes: a second diode D1, a first inductor L2, a second inductor L1, a twelfth capacitor C1, a thirteenth capacitor C2, a fourteenth capacitor C3, a fifteenth capacitor C4, a sixteenth capacitor C5 and a magnetic bead L3;
the specific connection mode of the filtering and reverse protection circuit is as follows: the anode of the second diode is added with positive voltage, the cathode of the second diode is connected with one end of the first inductor, the other end of the first inductor is connected with one end of the twelfth capacitor and the first end of the second inductor, the other end of the twelfth capacitor is added with negative voltage, the other end of the twelfth capacitor is connected with the second end of the second inductor, the third end of the second inductor is connected with one end of the thirteenth capacitor, one end of the fourteenth capacitor, one end of the fifteenth capacitor and one end of the magnetic bead, the fourth end of the second inductor is connected with the other end of the thirteenth capacitor, the other end of the fourteenth capacitor and the other end of the fifteenth capacitor are grounded, the other end of the magnetic bead is connected with one end of the sixteenth capacitor, the first preset chip of the direct-current power supply conversion circuit and the input end of the main driving circuit, and the other.
In the circuit, the voltage provided by the external direct current stabilized power supply is filtered by the circuit and then outputs a voltage V + with smaller fluctuation. And V + is used as the input voltage of the direct-current power supply conversion circuit and the main driving circuit. In this embodiment, D1 is a schottky power diode with a low on-state value, L2 is a differential mode power inductor, L1 is a common mode power inductor, C1 and C2 are tantalum capacitors with low equivalent resistance values, C3, C4 and C5 are magnetic medium capacitors, L3 is a power magnetic bead, and L3 functions as an inductor in the circuit of this embodiment, and can filter high-frequency harmonics in voltage, so that the circuit sign is the same as that of L2. When the power supply is correctly connected, the input power supply VIN1 is filtered through an L2 differential mode power inductor, an L1 common mode power inductor, a C1 tantalum capacitor, a C2 tantalum capacitor, a C3 magnetic medium capacitor, a C4 magnetic medium capacitor, a C5 magnetic bead, an L3 power magnetic bead and the like, power supply voltage ripples are suppressed, high-frequency noise, common mode noise and differential mode noise are filtered, and therefore noise interference on a main driving circuit can be remarkably reduced. After the filtering design processing, the filtering and reverse protection circuit in the embodiment passes through the GJB151B-CE102\ RE102 electromagnetic compatibility test standard. Fig. 6 shows an electromagnetic compatibility test chart of an RE102 of the conventional filtering and reverse-connection protection circuit, fig. 7 shows an electromagnetic compatibility test chart of a CE102 of the conventional filtering and reverse-connection protection circuit, fig. 8 shows an electromagnetic compatibility test chart of an RE102 of the filtering and reverse-connection protection circuit in the present embodiment, and fig. 9 shows an electromagnetic compatibility test chart of a CE102 of the filtering and reverse-connection protection circuit in the present embodiment. As can be seen from the above 4 graphs, as the operating frequency increases, the noise of the filtering and reverse protection circuit in this embodiment is significantly reduced compared to the existing circuit. In addition, if the power supply mistakenly connects the positive electrode and the negative electrode in an opposite mode, due to the unidirectional conduction characteristic of the D1, the circuit cannot be electrified, and therefore the main driving circuit can be protected from being damaged due to the fact that the power supply is connected.
The circuit diagram of the power bridge driving circuit in the present embodiment is as shown in fig. 10, and includes: a third predetermined chip U11, a fourth predetermined chip U12, a fifth predetermined chip U13, a seventeenth capacitor C16, an eighteenth capacitor C17, a nineteenth capacitor C18, a seventeenth resistor R16, an eighteenth resistor R17, a nineteenth resistor R18, a twentieth resistor R19, a twenty-first resistor R20, a twenty-second resistor R21, a second switching tube Q1, a third switching tube Q2, a fourth switching tube Q3, a fifth switching tube Q4, a sixth switching tube Q5, a seventh switching tube Q6, a third diode D3, a fourth diode D4 and a fifth diode D5;
the specific connection mode of the circuit is as follows: the third preset chip is connected with the first preset chip of the main driving circuit, one end of a seventeenth capacitor is connected with a first port of the third preset chip, the other end of the seventeenth capacitor is connected with a second port of the third preset chip, a source electrode of the second switching tube, a drain electrode of the third switching tube and an input end of a third diode, one end of a seventeenth resistor is connected with a third port of the third preset chip, the other end of the seventeenth resistor is connected with a grid electrode of the second switching tube, a voltage is applied to the drain electrode of the second switching tube, one end of an eighteenth resistor is connected with a fourth port of the third preset chip, the other end of the eighteenth resistor is connected with the grid electrode of the third switching tube, and the source electrode of the third switching tube is grounded;
the fourth preset chip is connected with the first preset chip of the main driving circuit, one end of an eighteenth capacitor is connected with the first port of the fourth preset chip, the other end of the eighteenth capacitor is connected with the second port of the fourth preset chip, the source electrode of a fourth switching tube, the drain electrode of a fifth switching tube and the input end of a fourth diode, one end of a nineteenth resistor is connected with the third port of the third preset chip, the other end of the nineteenth resistor is connected with the grid electrode of the fourth switching tube, voltage is applied to the drain electrode of the fourth switching tube, one end of a twentieth resistor is connected with the fourth port of the fourth preset chip, the other end of the twentieth resistor is connected with the grid electrode of the fifth switching tube, and the source electrode of the fifth switching tube is grounded;
the fifth preset chip is connected with the first preset chip of the main driving circuit, one end of a nineteenth capacitor is connected with the first port of the fifth preset chip, the other end of the nineteenth capacitor is connected with the second port of the fifth preset chip, the source electrode of the sixth switching tube, the drain electrode of the seventh switching tube and the input end of the fifth diode, one end of a twenty-first resistor is connected with the third port of the fifth preset chip, the other end of the twenty-first resistor is connected with the grid electrode of the sixth switching tube, the drain electrode of the sixth switching tube is applied with voltage, one end of a twenty-second resistor is connected with the fourth port of the fifth preset chip, the other end of the twenty-second resistor is connected with the grid electrode of the seventh switching tube, and the source electrode of the seventh switching tube is grounded.
The power bridge driving circuit of this embodiment adopts professional power bridge driving chip and high performance MOSFET power tube to constitute power output circuit, when reducing power output loss, can make calorific capacity lower, output power is bigger, the output power of the power bridge driving circuit of this embodiment is more than 2 times with the output power of the same kind design circuit of past, the total power of output of current power bridge driving circuit is about 18W, the output power of the power bridge driving circuit of this embodiment can reach more than 48W, thereby can satisfy the refrigerated requirement of high-power stirling refrigerator.
The circuit diagram of the temperature measurement feedback circuit of the present embodiment is shown in fig. 11, and includes: a predetermined temperature measuring element, a third inductor CM1, a twenty-third resistor R24, a twenty-fourth resistor R25, a twenty-fifth resistor R26, a twenty-sixth resistor R27, a twenty-seventh resistor R28, a twentieth capacitor C25, a twenty-first capacitor C26, a twenty-second capacitor C27 and a second predetermined operational amplifier A4;
the specific connection mode of the circuit is as follows: the positive pole An of the preset temperature measuring element is connected with the first end (marked with 3 in the figure), the negative pole Cat of the preset temperature measuring element is connected with the second end (marked with 4 in the figure) of the third inductor, one end of the twenty-third resistor is connected with the second end of the secondary side of the transformer, the other end of the twenty-third resistor is connected with the third end (marked with 1 in the figure) of the third inductor, one end of the twentieth capacitor and one end of the twenty-fifth resistor, the other end of the twentieth capacitor is connected with the fourth end (marked with 2 in the figure) of the third inductor, one end of the twenty-fourth resistor and one end of the twenty-sixth resistor, the other end of the twenty-fourth resistor is grounded, the other end of the twenty-fifth resistor is connected with one end of the twenty-first capacitor and the first end (marked with 3 in the figure) of the second preset operational amplifier, the other end of the twenty-sixth resistor is connected with one end of the twenty-second capacitor and the second end (, the other end of the twenty-first capacitor is connected with the other end of the twenty-second capacitor, a third end (marked with 4 in the figure) of the second preset operational amplifier and a fourth end (marked with 5 in the figure) of the second preset operational amplifier, the third end of the second preset operational amplifier is grounded, one end of the twenty-seventh resistor is connected with a fifth end (marked with 8 in the figure) of the second preset operational amplifier, the other end of the twenty-seventh resistor is connected with a sixth end (marked with 6 in the figure) of the second preset operational amplifier and an input end of the feedback comparison circuit, and a seventh end (marked with 7 in the figure) of the second preset operational amplifier is connected with a second end of the secondary side of the transformer.
In the temperature measurement feedback circuit of this embodiment, CM1 is a surface mount common mode inductor, this inductor can effectively suppress common mode interference, operational amplifier a4 can be integrated in the chip when specifically realizing, all have 7 ends in the temperature measurement feedback circuit of this embodiment, and through the filter network that C25, C26, C27, R25, R26 constitute, can filter the differential mode interference of the feedback signal of temperature measurement element output, and then make the interference that temperature measurement feedback circuit received show less, the interference killing feature strengthens, thereby show the precision that improves temperature control.
The circuit diagram of the feedback comparison circuit in the present embodiment is shown in fig. 12, and includes: a twenty-eighth resistor R29, a twenty-ninth resistor R30, a thirty-fifth resistor R31, a thirty-eleventh resistor R32, a thirty-second resistor R33, a thirty-third resistor R34, a twenty-third capacitor C28, a twenty-fourth capacitor C29, a twenty-fifth capacitor C30, a third predetermined operational amplifier A2B, a fourth predetermined operational amplifier A7 and a sixth predetermined chip A4;
the specific connection mode of the feedback comparison circuit is as follows: one end of a twenty-eighth resistor is connected with the output end of the temperature setting circuit, the other end of the twenty-eighth resistor is connected with one end of a twenty-ninth resistor and the non-inverting input end of a third preset operational amplifier, the inverting input end of the third preset operational amplifier is connected with the sixth end of a second preset operational amplifier of the temperature measurement feedback circuit, the other end of the twenty-ninth resistor is connected with the output end of the third preset operational amplifier and a sixth preset chip, one end of a thirty resistor is connected with the output end of the first preset operational amplifier of the temperature setting circuit, the other end of the thirty resistor is connected with one end of a twenty-third capacitor and the non-inverting input end of a fourth operational amplifier, the other end of the twenty-third capacitor is grounded, one end of a thirty-eleventh resistor is connected with the sixth preset chip, and the other end of the thirty resistor is connected with one end of a twenty-fourth capacitor and one end of a thirty, one end of a thirty-second resistor is connected with the sixth end of a second preset operational amplifier of the temperature measurement feedback circuit, the other end of the thirty-second resistor is connected with the inverting input end of a fourth preset operational amplifier, the other end of the thirty-third resistor and one end of a twenty-fifth capacitor, and the output end of the fourth preset operational amplifier is connected with the other end of the twenty-fourth capacitor, the other end of the twenty-fifth capacitor and the sixth preset chip.
The input end VIN1 of the circuit is the output of the temperature measurement feedback circuit, and the input end VIN2 is the output of the temperature setting circuit. The output signal VE of the feedback comparison circuit is connected to a main driving circuit and used as a control signal for adjusting PWM pulse width modulation of the main driving circuit. The circuit compares two input voltage values of VIN1 and VIN2 by using A7, amplifies the difference and outputs VE. R33, R34, C29, C30, R32, a5, A2B, R29, and R30 together constitute an amplification feedback circuit of a 7. If the difference between VIN2 and VIN1 is too large, the difference signal is amplified through A2B, so that the A5 is controlled to disconnect R32, and the amplification feedback circuit consists of R34, R33, C29 and C30, so that the filtering and feedback gain capacity can be enhanced, and the influence of spike interference on the temperature control stability can be inhibited. When the difference value between VIN1 and VIN2 is in a reasonable range, the amplification feedback circuit consists of R32, R34, R32 and C30, and a normal feedback filtering and feedback gain working mode is formed. Because the amplification feedback circuit can change along with different conditions, the feedback comparison circuit in the embodiment can effectively inhibit sudden peak interference in an external environment, and the inhibition capability of the sudden interference in the environment is obviously enhanced, so that the reliability of the Stirling refrigerator control circuit is obviously improved, and the performance of the infrared detector is obviously enhanced. Compared with the prior similar circuit, the method is used for testing the gray change of the detector image caused by the sudden temperature change caused by the environmental interference, and the gray change is reduced to 4 code values from more than 100 code values.
Further, the control circuit of the stirling cooler of the present embodiment further includes: as shown in fig. 13, when the overcurrent protection circuit operates, the equivalent resistance R after the Q7 element is turned on is obtained by inputting the current flowing through the GND3 connected to the sources of the power bridge driving circuits Q2, Q4, and Q6onSampling and converting the voltage signal into a voltage signal, sending the voltage signal into U10 in the main driving circuit, and judging whether the control circuit of the Stirling refrigerator is overloaded or not. When the current input by the overcurrent protection circuit exceeds the set value of the main drive circuit, the main drive circuit stops working, so that the control circuit of the Stirling refrigerator is protected from overload damage. One end of a resistor R34 is connected with one end of a voltage regulator tube D6 and is connected with a grid of a Q7, the other end of the resistor R34 is connected with a filter and an output voltage of an inverse protection circuit, the other end of the voltage regulator tube D6 is connected with the ground, a drain electrode of the Q7 is connected with a GND3 in a power bridge driving circuit, the SNS _ NI port of the main control chip U10 is connected with the R14 of the main driving circuit, a source electrode of the Q7 is connected with the ground, the SNS _ I port of the U10 is connected with the R15 of the main driving circuit, and a calculation formula of a currentstator(max)＝0.1/Ron。
The control circuit of the stirling cooler further comprises: the circuit diagram of the Hall power supply circuit is shown in fig. 14, the circuit converts the voltage VCC output by a power supply through a direct current power supply, and provides a voltage value V required by normal operation for a Hall sensor in the Stirling refrigerator after the voltage VCC is converted by an LDO chip U14HallAnd during specific implementation, the Hall sensor in the brushless direct current motor is connected through a lead.Pin 1(IN) and pin 3(SHDH) of U14 are connected to a voltage VCC output from the dc power supply conversion power supply, pin 2(GND) of U14 is connected to ground, one end of R22 is connected to one end of a magnetic dielectric nonpolar capacitor C19, one end of C20, and pin 5(OUT) of U16, the other end of R22 is connected to one end of R23 and pin 4(ADJ) of U14, the other end of R23 is connected to the other end of C19, the other end of C20, and pin 2(GND) of U14, and the other end of C19 and the other end of C20 are connected to ground. The Hall power supply circuit of the embodiment passes through the circuit according to the formula VHallThe output voltage value is determined after calculation is carried out on the condition of 1.22 x (1+ R19/R20), and after the output voltage value is filtered by C19 and C20, the output voltage value is connected to a Hall sensor inside the Stirling refrigerator through a lead wire so as to provide proper working voltage for the Hall sensor.
The control circuit of the stirling cooler of the present embodiment further includes: a hall feedback filter circuit, the circuit diagram of which is shown in fig. 15. The circuit carries out high-frequency interference removal and other processing on signals output by a Hall sensor in a Stirling refrigerator through a lead and then inputs the signals into a main driving circuit, the purpose is to prevent the signals output by the Hall sensor from being interfered, so that control signals output to a power bridge driving circuit by a main control circuit are disordered, and then the power bridge driving circuit is damaged, CP1 in the circuit is 8-pin small-package surface-mounted non-polar magnetic dielectric discharge capacitors, RP2 and RP1 are surface-mounted 8-pin small-package row resistors, pins 2, 3 and 4 of CP1 are grounded, pin 5 of CP1 is connected with a resistor pin 5, the output of the circuit in the figure is marked as HALLA and is connected with a HALLA port of a main driving circuit U10; pin 6 of CP1 is connected with pin 6 of the resistor, the output of the circuit is marked as HALLB, and the circuit is connected with a HALLB port of the main drive circuit U10; pin 7 of CP1 is connected with pin 7 of resistor RP2, the output of the circuit is marked as HALLC, and is connected with HALLC port of main drive circuit U10; pin 2 of RP2 is connected to pin 5 of RP1, designated HS1, and is connected to phase a of the hall sensor in the stirling cooler by a lead, pin 3 of RP2 is connected to pin 6 of RP1, designated HS2, and is connected to phase B of the hall sensor in the stirling cooler by a lead, and pin 4 of RP2 is connected to pin 7 of RP1, designated HS3, and is connected to phase C of the hall sensor in the stirling cooler by a lead. Pins 2, 3 and 4 of the RP1 exclusion are connected with VCC output of the secondary side of the transformer of the DC power supply conversion circuit.
In the control circuit of the stirling cryocooler provided by this embodiment, the dc power conversion circuit is connected to the main drive circuit, the temperature setting circuit, the filtering and reverse protection circuit, the temperature measurement feedback circuit, the hall power supply circuit, and the feedback comparison circuit; the main driving circuit is connected with the feedback comparison circuit, the power bridge driving circuit and the filtering and reverse connection protection circuit; the temperature setting circuit is connected with the feedback comparison circuit, the Hall power supply circuit and the temperature measurement feedback circuit; the temperature measurement feedback circuit is connected with the feedback comparison circuit; the Hall feedback filter circuit is connected with the main drive circuit, the direct-current power supply conversion circuit and a Hall sensor of the Stirling refrigerator; the Hall power supply circuit is connected with a Hall sensor of the Stirling refrigerator; the overcurrent protection circuit is connected with the power bridge drive circuit, the main drive circuit and the filtering and reverse connection protection circuit; and the power bridge driving circuit is connected with a three-phase winding of the Stirling refrigerator.
In the circuit, an external power supply supplies power to a filtering and reverse protection circuit, the output of the circuit is used as the input of a direct-current power supply conversion circuit and a main driving circuit, the output of the direct-current power supply conversion circuit is used as the input of a Hall power supply circuit, the output of the Hall power supply circuit provides proper working voltage for a Hall sensor of the Stirling refrigerator, and when the voltage value measured by a temperature measuring element in a temperature measuring feedback circuit is smaller than a set level value, the Stirling refrigerator works at full speed to rapidly cool; when the voltage value measured by the temperature measurement feedback circuit is close to a set level value, the voltage value set by the temperature control setting circuit is compared with the voltage value obtained by the temperature measurement feedback circuit, the voltage value is output as a control level through the feedback comparison circuit, the level is input into the main driving circuit to be compared with a triangular wave generated by the main driving circuit, the main driving circuit outputs a Pulse Width Modulation (PWM) wave, the PWM wave is used as the input of the power bridge driving circuit, and the power is output to a three-phase winding of the Stirling refrigerator through the power bridge driving circuit so as to control the Stirling refrigerator to adjust the rotating speed, thereby controlling the output power of the Stirling refrigerator. The following problems in the prior art are solved: the control circuit of the existing Stirling refrigerator is not suitable for controlling the Stirling refrigerator which can provide the required cold quantity for the stable work of the large-area array infrared detector.
The invention has the following beneficial effects:
the feedback comparison circuit with variable gain and variable filter network is adopted, so that the larger instantaneous interference in the external environment can be effectively inhibited, and the temperature control stability of the control circuit of the Stirling refrigerator is obviously improved; in the temperature setting circuit, a high-precision voltage reference source and a precision resistance network are adopted to set a temperature value, so that the precision of temperature regulation is improved; meanwhile, the area of the circuit board is reduced, so that the miniaturization and integrated manufacturing are facilitated, meanwhile, a large number of surface-mounted integrated chips and peripheral surface-mounted small-packaged components are adopted, the layout is compact in circuit design, the anti-interference capability is high, the Stirling refrigerator is accurately controlled, and a stable and reliable low-temperature working environment is provided for a large-area-array infrared detector assembly with large cooling capacity.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, and the scope of the invention should not be limited to the embodiments described above.

Claims (7)

1. A control circuit for a stirling cooler, comprising:
the device comprises a Hall power supply circuit, a filtering and reverse connection protection circuit, a direct current power supply conversion circuit, a temperature setting circuit, a temperature measurement feedback circuit, a Hall feedback filter circuit, a feedback comparison circuit, a main drive circuit, an overcurrent protection circuit and a power bridge drive circuit;
the Hall power supply circuit is connected with the direct-current power supply conversion circuit and a Hall sensor of the Stirling refrigerator; the filtering and reverse connection protection circuit is connected with the direct-current power supply conversion circuit and the main driving circuit; the direct-current power supply conversion circuit is connected with the main drive circuit, the temperature setting circuit, the temperature measurement feedback circuit and the feedback comparison circuit; the main driving circuit is connected with the feedback comparison circuit and the power bridge driving circuit; the temperature setting circuit is connected with the feedback comparison circuit, the Hall power supply circuit and the temperature measurement feedback circuit; the temperature measurement feedback circuit is connected with the feedback comparison circuit; the Hall feedback filter circuit is connected with the main drive circuit, the direct-current power supply conversion circuit and a Hall sensor of the Stirling refrigerator; the overcurrent protection circuit is connected with the power bridge drive circuit, the main drive circuit and the filtering and reverse connection protection circuit; the power bridge driving circuit is connected with a three-phase winding of the Stirling refrigerator;
the DC power conversion circuit includes:
the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first switching tube, a first preset chip and a transformer;
one end of the first resistor is connected with one end of the first capacitor, the other end of the first resistor is connected with the first port of the first predetermined chip, the other end of the first capacitor is connected with one end of the second capacitor, the other end of the second capacitor is connected with the second port of the first predetermined chip, one end of the third capacitor is connected with one end of the second resistor, one end of the second resistor is grounded, the other end of the third capacitor is connected with the third port of the first predetermined chip, and the other end of the second resistor is connected with the fourth port of the first predetermined chip;
one end of the third resistor is connected with the fifth port of the first preset chip, the other end of the third resistor is connected with the sixth port of the first preset chip, the grid electrode of the first switch tube is connected with the seventh port of the first preset chip, the source electrode of the first switch tube is connected with one end of the fourth resistor and the eighth port of the first preset chip, the other end of the fourth resistor is connected with the ninth port of the first preset chip, the ninth port is grounded, the drain electrode of the switch tube is connected with one end of the primary side of the transformer, and the other end of the primary side of the transformer is connected with the tenth port of the first preset chip;
the first end of the secondary side of the transformer is connected with one end of a fifth capacitor, the input end of the main driving circuit and the input end of the Hall power supply circuit, the other end of the fifth capacitor is grounded, the second end of the secondary side of the transformer is connected with one end of a fourth capacitor, one end of a fifth resistor, the input end of the temperature setting circuit, the input end of the temperature measurement feedback circuit and the input end of the feedback comparison circuit, the other end of the fourth capacitor is grounded, the other end of the fifth resistor is connected with one end of a sixth resistor, the other end of the sixth resistor is connected with the third end of the secondary side of the transformer, and the third end of the sixth resistor is grounded.
2. The control circuit of claim 1, wherein the main drive circuit comprises:
the circuit comprises a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a first diode and a second predetermined chip;
wherein a cathode of the first diode is connected to an output terminal of the feedback comparison circuit, an anode of the first diode is connected to one end of the seventh resistor, one end of the tenth capacitor, and a first port of the second predetermined chip, the other end of the seventh resistor is connected to one end of the eighth resistor and a second port of the second predetermined chip, the other end of the eighth resistor is connected to a third port of the second predetermined chip, one end of the ninth capacitor, and one end of the tenth resistor, the other end of the tenth resistor is connected to one end of the eleventh resistor, one end of the eleventh resistor is grounded, the other end of the eleventh resistor is connected to a fourth port of the second predetermined chip and one end of the ninth resistor, and the other end of the ninth resistor is connected to one end of the eighth capacitor and a fifth port of the second predetermined chip, the other end of the eighth capacitor, the other end of the ninth capacitor and the other end of the tenth capacitor are grounded, one end of the twelfth resistor is connected to the sixth port of the second predetermined chip, the other end of the twelfth resistor is grounded, one end of the thirteenth resistor is connected to the seventh port of the second predetermined chip, the other end of the thirteenth resistor is grounded, one end of the sixth capacitor is connected to the eighth port of the second predetermined chip, the other end of the sixth capacitor is grounded, one end of the fourteenth resistor is connected to one end of the sixteenth resistor, one end of the seventh capacitor and the ninth port of the second predetermined chip, the other end of the fourteenth resistor is grounded, and the other end of the sixteenth resistor is connected to one end of the fifteenth resistor, the other end of the seventh capacitor and the tenth port of the second predetermined chip, the other end of the fifteenth resistor is grounded.
3. The control circuit of claim 1, wherein the temperature setting circuit comprises:
the voltage reference source, the predetermined resistance network, the potentiometer, the eleventh capacitor and the first predetermined operational amplifier;
an input end of the voltage reference source is connected to a second end of the secondary side of the transformer of the dc power conversion circuit, an output end of the voltage reference source is connected to a first end of the predetermined resistor network, a third end of the predetermined resistor network is connected to a ground end of the voltage reference source, the ground end of the voltage reference source is grounded, a second end of the predetermined resistor network is connected to a first end of the potentiometer, a fourth end of the predetermined resistor network is connected to a second end of the potentiometer, a third end of the potentiometer is connected to one end of the eleventh capacitor and a non-inverting input end of the first predetermined operational amplifier, another end of the eleventh capacitor is grounded, an inverting input end of the first predetermined operational amplifier is connected to an output end of the first predetermined operational amplifier, and a positive power source end of the first predetermined operational amplifier is connected to a second end of the secondary side of the transformer of the dc power conversion circuit And then, the negative power supply end of the first predetermined operational amplifier is grounded.
4. The control circuit of any of claims 1-2, wherein the filtering and reverse-connection protection circuit comprises:
the second diode, the first inductor, the second inductor, the twelfth capacitor, the thirteenth capacitor, the fourteenth capacitor, the fifteenth capacitor, the sixteenth capacitor and the magnetic bead;
the anode of the second diode is positively charged, the cathode of the second diode is connected to one end of the first inductor, the other end of the first inductor is connected to one end of the twelfth capacitor and the first end of the second inductor, the other end of the twelfth capacitor is negatively charged, the other end of the twelfth capacitor is connected to the second end of the second inductor, the third end of the second inductor is connected to one end of the thirteenth capacitor, one end of the fourteenth capacitor, one end of the fifteenth capacitor and one end of the magnetic bead, the fourth end of the second inductor is connected to the other end of the thirteenth capacitor, the other end of the fourteenth capacitor and the other end of the fifteenth capacitor are grounded, and the other end of the magnetic bead is connected to one end of the sixteenth capacitor, the first predetermined chip of the dc power conversion circuit and the input end of the main driving circuit And the other end of the sixteenth capacitor is grounded.
5. The control circuit of claim 1, wherein the power bridge drive circuit comprises:
a third predetermined chip, a fourth predetermined chip, a fifth predetermined chip, a seventeenth capacitor, an eighteenth capacitor, a nineteenth capacitor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, a sixth switching tube, a seventh switching tube, a third diode, a fourth diode and a fifth diode;
the third preset chip is connected with the first preset chip of the main driving circuit, one end of a seventeenth capacitor is connected with a first port of the third preset chip, the other end of the seventeenth capacitor is connected with a second port of the third preset chip, a source electrode of the second switching tube, a drain electrode of the third switching tube and an input end of the third diode, one end of a seventeenth resistor is connected with a third port of the third preset chip, the other end of the seventeenth resistor is connected with a grid electrode of the second switching tube, the drain electrode of the second switching tube is applied with voltage, one end of an eighteenth resistor is connected with a fourth port of the third preset chip, the other end of the eighteenth resistor is connected with the grid electrode of the third switching tube, and the source electrode of the third switching tube is grounded;
the fourth preset chip is connected with the first preset chip of the main driving circuit, one end of an eighteenth capacitor is connected with a first port of the fourth preset chip, the other end of the eighteenth capacitor is connected with a second port of the fourth preset chip, a source electrode of the fourth switching tube, a drain electrode of the fifth switching tube and an input end of the fourth diode, one end of a nineteenth resistor is connected with a third port of the third preset chip, the other end of the nineteenth resistor is connected with a grid electrode of the fourth switching tube, the drain electrode of the fourth switching tube is applied with voltage, one end of a twentieth resistor is connected with a fourth port of the fourth preset chip, the other end of the twentieth resistor is connected with the grid electrode of the fifth switching tube, and the source electrode of the fifth switching tube is grounded;
the fifth preset chip is connected with the first preset chip of the main driving circuit, one end of a nineteenth capacitor is connected with a first port of the fifth preset chip, the other end of the nineteenth capacitor is connected with a second port of the fifth preset chip, a source electrode of the sixth switching tube, a drain electrode of the seventh switching tube and an input end of a fifth diode, one end of a twenty-first resistor is connected with a third port of the fifth preset chip, the other end of the twenty-first resistor is connected with a grid electrode of the sixth switching tube, the drain electrode of the sixth switching tube is applied with voltage, one end of a twenty-second resistor is connected with a fourth port of the fifth preset chip, the other end of the twenty-second resistor is connected with the grid electrode of the seventh switching tube, and the source electrode of the seventh switching tube is grounded.
6. The control circuit of claim 1, wherein the thermometry feedback circuit comprises:
the temperature measuring circuit comprises a preset temperature measuring element, a third inductor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a twentieth capacitor, a twenty-first capacitor, a twenty-second capacitor and a second preset operational amplifier;
wherein the positive electrode of the predetermined temperature measuring element is connected with the first end of the third inductor, the negative electrode of the predetermined temperature measuring element is connected with the second end of the third inductor, one end of the twenty-third resistor is connected with the second end of the secondary side of the transformer, the other end of the twenty-third resistor is connected with the third end of the third inductor, one end of the twentieth capacitor and one end of the twenty-fifth resistor, the other end of the twentieth capacitor is connected with the fourth end of the third inductor, one end of the twenty-fourth resistor and one end of the twenty-sixth resistor, the other end of the twenty-fourth resistor is grounded, the other end of the twenty-fifth resistor is connected with one end of the twenty-first capacitor and the first end of the second predetermined operational amplifier, the other end of the twenty-sixth resistor is connected with one end of the twenty-second capacitor and the second end of the second predetermined operational amplifier, the other end of the twenty-first capacitor is connected with the other end of the twenty-second capacitor, the third end of the second preset operational amplifier and the fourth end of the second preset operational amplifier, the third end of the second preset operational amplifier is grounded, one end of the twenty-seventh resistor is connected with the fifth end of the second preset operational amplifier, the other end of the twenty-seventh resistor is connected with the sixth end of the second preset operational amplifier and the input end of the feedback comparison circuit, and the seventh end of the second preset operational amplifier is connected with the second end of the secondary side of the transformer.
7. The control circuit of claim 6, wherein the feedback comparison circuit comprises:
a twenty-eighth resistor, a twenty-ninth resistor, a thirty-sixth resistor, a thirty-eleventh resistor, a thirty-second resistor, a thirty-third resistor, a twenty-third capacitor, a twenty-fourth capacitor, a twenty-fifth capacitor, a third predetermined operational amplifier, a fourth predetermined operational amplifier and a sixth predetermined chip;
wherein one end of the twenty-eighth resistor is connected to the output end of the temperature setting circuit, the other end of the twenty-eighth resistor is connected to one end of the twenty-ninth resistor and the non-inverting input end of the third predetermined operational amplifier, the inverting input end of the third predetermined operational amplifier is connected to the sixth end of the second predetermined operational amplifier of the temperature measurement feedback circuit, the other end of the twenty-ninth resistor is connected to the output end of the third predetermined operational amplifier and the sixth predetermined chip, one end of the thirty resistor is connected to the output end of the first predetermined operational amplifier of the temperature setting circuit, the other end of the thirty resistor is connected to one end of the twenty-third capacitor and the non-inverting input end of the fourth predetermined operational amplifier, and the other end of the twenty-third capacitor is grounded, one end of the thirty-first resistor is connected with the sixth preset chip, the other end of the thirty-first resistor is connected with one end of the twenty-fourth capacitor and one end of the thirty-third resistor, one end of the thirty-second resistor is connected with the sixth end of the second preset operational amplifier of the temperature measurement feedback circuit, the other end of the thirty-second resistor is connected with the inverting input end of the fourth preset operational amplifier, the other end of the thirty-third resistor and one end of the twenty-fifth capacitor, and the output end of the fourth preset operational amplifier is connected with the other end of the twenty-fourth capacitor, the other end of the twenty-fifth capacitor and the sixth preset chip.
CN201711444229.4A 2017-12-27 2017-12-27 Control circuit of Stirling refrigerator Active CN108317786B (en)

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Citations (8)

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CN101373930A (en) * 2007-08-24 2009-02-25 群康科技(深圳)有限公司 DC voltage converting circuit
CN204806752U (en) * 2015-07-01 2015-11-25 中国电子科技集团公司第十六研究所 Gas bearing stirling refrigerator control system
CN105466064A (en) * 2015-12-16 2016-04-06 中国电子科技集团公司第十一研究所 Universal split type linear stirling refrigerator driving method and driving circuit
CN105571224A (en) * 2015-12-21 2016-05-11 中国电子科技集团公司第十一研究所 Universal type rotary Stirling cryocooler drive controller
CN205388716U (en) * 2016-02-03 2016-07-20 中国电子科技集团公司第十六研究所 Stirling refrigerator controller with accurate temperature data collection performance
CN106288479A (en) * 2016-07-28 2017-01-04 武汉高芯科技有限公司 Rotate the driving of separated type pneumatic stirling refrigerator and temperature control system and method
CN206593776U (en) * 2017-04-01 2017-10-27 常州光电技术研究所 A kind of high precision measuring temperature circuit for sterlin refrigerator
CN206626868U (en) * 2017-04-06 2017-11-10 常州光电技术研究所 A kind of stirling refrigeration machine controller of high reliability

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101373930A (en) * 2007-08-24 2009-02-25 群康科技(深圳)有限公司 DC voltage converting circuit
CN204806752U (en) * 2015-07-01 2015-11-25 中国电子科技集团公司第十六研究所 Gas bearing stirling refrigerator control system
CN105466064A (en) * 2015-12-16 2016-04-06 中国电子科技集团公司第十一研究所 Universal split type linear stirling refrigerator driving method and driving circuit
CN105571224A (en) * 2015-12-21 2016-05-11 中国电子科技集团公司第十一研究所 Universal type rotary Stirling cryocooler drive controller
CN205388716U (en) * 2016-02-03 2016-07-20 中国电子科技集团公司第十六研究所 Stirling refrigerator controller with accurate temperature data collection performance
CN106288479A (en) * 2016-07-28 2017-01-04 武汉高芯科技有限公司 Rotate the driving of separated type pneumatic stirling refrigerator and temperature control system and method
CN206593776U (en) * 2017-04-01 2017-10-27 常州光电技术研究所 A kind of high precision measuring temperature circuit for sterlin refrigerator
CN206626868U (en) * 2017-04-06 2017-11-10 常州光电技术研究所 A kind of stirling refrigeration machine controller of high reliability

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