DC steady current power supply device

Abstract

The present application relates to a DC constant current power supply device, which includes a first rectification circuit, an inversion circuit, a second rectification circuit, a first current sensor assembly, a second current sensor assembly, a voltage sensor assembly, a voltage feedback circuit, a current feedback circuit and a main control circuit; the inversion circuit converts the first direct current output by the first rectification circuit into a second alternating current under the drive of a drive signal generated by the main control circuit according to a second feedback signal; the second rectification circuit converts the second alternating current into a second direct current and outputs it to a load; the voltage feedback circuit generates a first feedback signal based on a set signal and a first signal obtained by the voltage sensor assembly collecting the second direct current; the current feedback circuit generates a second feedback signal based on the first feedback signal, a second signal obtained by the first current sensor assembly collecting the second alternating current and a third signal obtained by the second current sensor assembly collecting the second direct current. In this way, the stability and accuracy of the actual output power supply are ensured.

Description

Technical Field

[0001] This application relates to the technical field of seismic observation, and particularly relates to a DC constant current power supply device. Background Art

[0002] In earthquake precursor observation, existing geoelectric resistivity observation methods mostly originate from geophysical direct current methods. Geophysical direct current methods observe the differences in geoelectric resistivity in different regions, that is, the variation of geoelectric resistivity with space, while earthquake prediction research requires observing the variation of geoelectric resistivity with time at the same location, that is, the time difference of geoelectric resistivity. Since the electrical property changes of underground media before an earthquake are slow, it is required that the geoelectric resistivity observation method has higher resolution than geophysical direct current methods and maintain high observation accuracy over a long period of time (within the annual scale). This requires a dedicated geoelectric observation system suitable for detecting earthquake precursors.

[0003] The dedicated geoelectric observation system for earthquake precursors consists of a device system, a measurement system, and a calibration system. The measurement system consists of a measuring instrument and a power supply. During the measurement of geoelectric resistivity, a constant current power supply is required to supply power to the ground to establish an artificial electric field. The geoelectric resistivity measuring instrument calculates the geoelectric resistivity value by measuring the artificial potential difference and the current magnitude of the constant current power supply. This makes the stability and load-carrying capacity of the constant current power supply have high requirements when supplying power to the ground for measurement. If the output current stability of the constant current power supply is poor, the artificial potential difference will change with the change of the current, thus making the observed geoelectric resistivity value unreliable. Summary of the Invention

[0004] In view of this, the purpose of this application is to overcome the deficiencies of the prior art and provide a DC constant current power supply device.

[0005] To achieve the above purpose, the following technical solutions are adopted in this application:

[0006] This application provides a DC constant current power supply device, which is applied to an earthquake geoelectric resistivity observation system. The DC constant current power supply device includes: a first rectifier circuit, an inverter circuit, a second rectifier circuit, a first current sensor assembly, a second current sensor assembly, a voltage sensor assembly, a voltage feedback circuit, a current feedback circuit, and a main control circuit;

[0007] The first rectifier circuit is connected to the inverter circuit and is also used to connect to an external first alternating current; the inverter circuit is respectively connected to the first current sensor assembly, the second rectifier circuit, and the main control circuit; the second rectifier circuit is connected to the second current sensor assembly and the voltage sensor assembly; the voltage feedback circuit is respectively connected to the voltage sensor assembly and an external device; the current feedback circuit is respectively connected to the first current sensor assembly, the second current sensor assembly, the voltage feedback circuit, and the main control circuit;

[0008] The first rectifier circuit is configured to convert the first alternating current into first direct current and output it to the inverter circuit; the inverter circuit is configured to convert the first direct current into second alternating current under the drive of the drive signal of the main control circuit and output it to the second rectifier circuit; the second rectifier circuit is configured to convert the second alternating current into second direct current and output it to the load.

[0009] The voltage sensor assembly is configured to collect the voltage of the second direct current, obtain a first signal and output it to the voltage feedback circuit; the voltage feedback circuit is configured to generate a first feedback signal based on the set signal of the external device and the first signal and output it to the current feedback circuit; the first current sensor assembly is configured to collect the current of the second alternating current, obtain a second signal and output it to the current feedback circuit; the second current sensor assembly is configured to collect the current of the second direct current, obtain a third signal and output it to the current feedback circuit.

[0010] The current feedback circuit is configured to generate a second feedback signal based on the first feedback signal, the second signal and the third signal and send it to the main control circuit.

[0011] The main control circuit is configured to generate a drive signal based on the second feedback signal and output it to the inverter circuit.

[0012] Optionally, the voltage feedback circuit includes a first reverse adder and a first PI regulator connected in series; the first reverse adder is further configured to be respectively connected to the voltage sensor assembly and the external device to perform reverse addition on the set signal provided by the external device and the first signal provided by the voltage sensor assembly to obtain a first control deviation and output it to the first PI regulator; the first PI regulator is connected to the current feedback circuit and is configured to perform PI regulation based on the first control deviation to obtain the first feedback signal and output it to the current feedback circuit.

[0013] Optionally, the first reverse adder includes a first resistor, a second resistor, a third resistor, a fourth resistor and a first differential amplifier; wherein, the inverting input terminal of the first differential amplifier is respectively connected to the external device through the first resistor, the output terminal of the voltage sensor assembly through the second resistor and the output terminal of the first differential amplifier through the third resistor, the non-inverting input terminal is grounded through the fourth resistor, and the output terminal is further configured to be connected to the first PI regulator.

[0014] And / or, the first PI regulator includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor, a second capacitor, a first zener diode, and a second differential amplifier; wherein, the inverting input terminal of the second differential amplifier is respectively connected to the output terminal of the first differential amplifier through the fifth resistor, connected to the first terminal of the sixth resistor through the first capacitor, and connected to the first terminal of the sixth resistor through the seventh resistor and the second capacitor, the non-inverting input terminal is grounded through the eighth resistor, and the output terminal is connected to the second terminal of the sixth resistor; the first terminal of the sixth resistor is further respectively connected to the negative electrode of the first zener diode and the current feedback circuit; the positive electrode of the first zener diode is grounded.

[0015] Optionally, the current feedback circuit includes a second reverse adder and a second PI regulator connected together; the second reverse adder is further configured to be respectively connected to the voltage feedback circuit, the first current sensor assembly, and the second current sensor assembly, so as to perform reverse addition on the first feedback signal provided by the voltage feedback circuit, the second signal provided by the first current sensor assembly, and the third signal provided by the second current sensor assembly, obtain a second control deviation and output it to the second PI regulator; the second PI regulator is further connected to the main control circuit, and is configured to perform PI regulation based on the second control deviation, obtain the second feedback signal and output it to the main control circuit.

[0016] Optionally, the second reverse adder includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a third differential amplifier; the inverting input terminal of the third differential amplifier is respectively connected to the output terminal of the first current sensor assembly through the ninth resistor, connected to the output terminal of the second current sensor assembly through the tenth resistor, connected to the output terminal of the voltage feedback circuit through the eleventh resistor, and connected to the output terminal of the third differential amplifier through the twelfth resistor, the non-inverting input terminal is grounded through the thirteenth resistor, and the output terminal is further configured to be connected to the second PI regulator;

[0017] And / or, the second PI regulator includes a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a third capacitor, a fourth capacitor, a second zener diode, and a fourth differential amplifier; the inverting input terminal of the fourth differential amplifier is respectively connected to the output terminal of the third differential amplifier through the fourteenth resistor, connected to the output terminal of the fourth differential amplifier through the third capacitor and the fifteenth resistor, and connected to the output terminal of the fourth differential amplifier through the sixteenth resistor, the fourth capacitor, and the fifteenth resistor. The non-inverting input terminal is grounded through the seventeenth resistor, and the output terminal is respectively connected to the main control circuit and the negative electrode of the second zener diode through the fifteenth resistor and the eighteenth resistor; the positive electrode of the second zener diode is grounded.

[0018] Optionally, it further includes a first interface, which is connected to the input terminal of the first rectifier circuit and is used to connect to the external first alternating current.

[0019] Optionally, it further includes a second interface, which is connected to the output terminal of the second rectifier circuit and is used to output the second direct current to the load.

[0020] Optionally, it further includes a filter circuit, which is respectively connected to the second rectifier circuit and the second interface and is used to filter the second direct current output by the second rectifier circuit and output it to the second interface.

[0021] Optionally, it further includes a transistor drive circuit, which is respectively connected to the inverter circuit and the main control circuit and is used to perform drive isolation on the drive signal output by the main control circuit and then output it to the inverter circuit.

[0022] Optionally, it further includes a numerical control circuit, which is connected to the voltage feedback circuit and is used to receive the set signal given by the external device and output it to the voltage feedback circuit.

[0023] The technical solution provided by this application may include the following beneficial effects:

[0024] In the solution of this application, the first rectifier circuit is used to rectify the first alternating current input externally to obtain the first direct current. The driving signal output by the main control circuit is used to drive the inverter circuit to invert the first direct current to obtain the second alternating current. The second rectifier circuit is used to perform secondary rectification on the second alternating current, and the finally obtained second direct current is the actual output power supply. Based on this, the first current sensor component is used to collect the current of the second alternating current after being processed by the inverter circuit to obtain the second signal, that is, the current feedback signal of the inverted second alternating current is obtained. The voltage sensor component is used to collect the second direct current to obtain the first signal, that is, the voltage feedback signal of the actual output power supply is obtained. The second current sensor component is used to collect the second alternating current to obtain the third signal, that is, the current feedback signal of the actual output power supply is obtained. The first signal and the set signal input by the external device are input into the voltage feedback circuit to obtain the first feedback signal. Then, the first feedback signal, the second signal, and the third signal are input into the current feedback circuit to generate the second feedback signal and input it into the main control circuit to adjust the driving signal output by the main control circuit to drive the inverter circuit. In this way, three closed feedback loops are formed: the current inner loop feedback that feeds back the second signal through the first current sensor component, the current outer loop feedback that feeds back the third signal through the second current sensor component, and the voltage outer loop feedback that feeds back the first signal through the pressure sensor. The three closed feedback loops can real-time feedback the instantaneous state during the working process of the DC constant current power supply device to the main control circuit, so that the main control circuit can make corresponding adjustments based on the set signal of the external device to achieve the instantaneous regulation of the DC constant current power supply device. Finally, the actual output power supply of the DC constant current power supply device is infinitely close to the set value given by the external device, ensuring the stability and accuracy of the actual output power supply. At the same time, the high-precision instantaneous regulation ensures the effective output of the DC constant current power supply device and improves its load-carrying capacity. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a schematic structural diagram of a DC constant current power supply device provided by an embodiment of the present application.

[0027] Figure 2 It is a circuit diagram of the first rectifier circuit of a DC constant current power supply device provided by another embodiment of the present application.

[0028] Figure 3It is a circuit diagram of an inverter circuit and a first current sensor assembly of a DC constant current power supply device provided by another embodiment of the present application.

[0029] Figure 4 It is a circuit diagram of a second rectifier circuit, a second current sensor assembly and a voltage sensor assembly of a DC constant current power supply device provided by another embodiment of the present application.

[0030] Figure 5 It is a circuit diagram of a voltage feedback circuit of a DC constant current power supply device provided by another embodiment of the present application.

[0031] Figure 6 It is a circuit diagram of a current feedback circuit and a main control circuit of a DC constant current power supply device provided by another embodiment of the present application.

[0032] Figure 7 It is a schematic structural diagram of a DC constant current power supply device provided by another embodiment of the present application. Detailed implementation manners

[0033] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other implementation manners obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope protected by the present application.

[0034] Embodiment

[0035] Refer to Figure 1 , Figure 1 It is a schematic structural diagram of a DC constant current power supply device provided by an embodiment of the present application.

[0036] As Figure 1 shown, this embodiment provides a DC constant current power supply device, which is applied to a seismic geoelectric resistivity observation system. The DC constant current power supply device 1 may specifically include: a first rectifier circuit 101, an inverter circuit 102, a second rectifier circuit 103, a first current sensor assembly 104, a second current sensor assembly 105, a voltage sensor assembly 106, a voltage feedback circuit 107, a current feedback circuit 108 and a main control circuit 109;

[0037] The first rectifier circuit 101 is connected to the inverter circuit 102 and is also used to access the external first alternating current; the inverter circuit 102 is respectively connected to the first current sensor assembly 104, the second rectifier circuit 103 and the main control circuit 109; the second rectifier circuit 103 is connected to the second current sensor assembly 105 and the voltage sensor assembly 106; the voltage feedback circuit 107 is respectively connected to the voltage sensor assembly 106 and the external device 110; the current feedback circuit 108 is respectively connected to the first current sensor assembly 104, the second current sensor assembly 105, the voltage feedback circuit 107 and the main control circuit 108;

[0038] The first rectifier circuit 101 is used to convert the first alternating current into the first direct current and output it to the inverter circuit 102; the inverter circuit 102 is used to convert the first direct current into the second alternating current under the drive of the drive signal of the main control circuit 109 and output it to the second rectifier circuit 103; the second rectifier circuit 103 is used to convert the second alternating current into the second direct current and output it to the load;

[0039] The voltage sensor assembly 106 is used to collect the voltage of the second direct current, obtain the first signal and output it to the voltage feedback circuit 17; the voltage feedback circuit 107 is used to generate the first feedback signal based on the set signal of the external device 110 and the first signal and output it to the current feedback circuit 108; the first current sensor assembly 104 is used to collect the current of the second alternating current, obtain the second signal and output it to the current feedback circuit 108; the second current sensor assembly 105 is used to collect the current of the second direct current, obtain the third signal and output it to the current feedback circuit 108;

[0040] The current feedback circuit 108 is used to generate the second feedback signal based on the first feedback signal, the second signal and the third signal and send it to the main control circuit 109;

[0041] The main control circuit 109 is used to generate the drive signal according to the second feedback signal and output it to the inverter circuit 102.

[0042] Wherein, Vin is the input end of the DC constant current power supply device 1, and Vout is the output end of the DC constant current power supply device 1.

[0043] In the solution of this application, the first rectifier circuit is used to rectify the first alternating current input from the outside to obtain the first direct current. The driving signal output by the main control circuit is used to drive the inverter circuit to invert the first direct current to obtain the second alternating current. The second rectifier circuit is used to perform secondary rectification on the second alternating current, and the finally obtained second direct current is the actual output power supply. Based on this, the first current sensor component is used to collect the current of the second alternating current after being processed by the inverter circuit to obtain the second signal, that is, the current feedback signal of the second alternating current after inversion is obtained. The voltage sensor component is used to collect the second direct current to obtain the first signal, that is, the voltage feedback signal of the actual output power supply is obtained. The second current sensor component is used to collect the second alternating current to obtain the third signal, that is, the current feedback signal of the actual output power supply is obtained. The first signal and the set signal input by the external device are input into the voltage feedback circuit to obtain the first feedback signal. Then, the first feedback signal, the second signal, and the third signal are input into the current feedback circuit to generate the second feedback signal and input it into the main control circuit to adjust the driving signal output by the main control circuit to drive the inverter circuit. In this way, three closed feedback loops are formed: the current inner loop feedback that feeds back the second signal through the first current sensor component, the current outer loop feedback that feeds back the third signal through the second current sensor component, and the voltage outer loop feedback that feeds back the first signal through the pressure sensor. The three closed feedback loops can feedback the instantaneous state during the working process of the DC constant current power supply device to the main control circuit in real time, so that the main control circuit can make corresponding adjustments based on the set signal of the external device to achieve the instantaneous regulation of the DC constant current power supply device. Finally, the actual output power supply of the DC constant current power supply device is infinitely close to the set value given by the external device, ensuring the stability and accuracy of the actual output power supply. At the same time, the high-precision instantaneous regulation ensures the effective output of the DC constant current power supply device and improves its load-carrying capacity.

[0044] See Figure 2 , Figure 2 is the circuit diagram of the first rectifier circuit of a DC constant current power supply device provided by another embodiment of this application.

[0045] The above-mentioned first rectifier circuit 101 is used to rectify the first alternating current input from the outside to output the first direct current to the inverter current. During implementation, such as Figure 2As shown, the first rectifier circuit may include a first rectifier bridge BG1, a second rectifier bridge BG2, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a nineteenth resistor R19, a twentieth resistor R20, a third diode D3, and a fourth diode D4; wherein, the two AC input terminals of the first rectifier bridge BG1 are respectively connected to the neutral wire AC-N and the live wire AC-L of the externally input alternating current, the positive output terminal is respectively connected to the positive output terminal of the second rectifier bridge BG2, the positive pole of the third diode D3, the positive pole of the fifth capacitor C5, the positive pole of the sixth capacitor C6, and the positive output terminal DC+, and the negative output terminal is connected to the negative output terminal of the second rectifier bridge BG2; the two AC input terminals of the second rectifier bridge BG2 are respectively connected to the neutral wire AC-N and the live wire AC-L of the externally input alternating current, and the negative output terminal is respectively connected to the negative pole of the fourth diode D4, the negative pole of the seventh capacitor C7, the negative pole of the eighth capacitor C8, and the negative output terminal DC-; the negative pole of the third diode D3 is connected to the negative pole of the sixth capacitor C6 and the positive pole of the eighth capacitor C8 through the nineteenth resistor R19 respectively; the positive pole of the fourth diode D4 is connected to the negative pole of the sixth capacitor C6 and the positive pole of the eighth capacitor C8 through the twentieth resistor R20; the negative pole of the fifth capacitor C5 is connected to the positive pole of the seventh capacitor C7; wherein, the models of the first rectifier bridge and the second rectifier bridge may be GBJ3510, the first capacitor, the second capacitor, the third capacitor, and the fourth capacitor may be selected as 1000uf / 400V of Jianghai, the third diode and the fourth diode may be light-emitting diodes, and the positive output terminal DC+ and the negative output terminal DC- are used as the output terminals of the first rectifier circuit to output the first direct current. During operation, the first rectifier circuit may be connected to the first alternating current, filter the AC sine half-wave voltage into an approximate DC voltage to provide a stable DC voltage source for the inverter circuit. When the alternating current is the commercial power of 220V, the DC voltage amplitude is about 350VDC. Finally, the direct current is output to the inverter circuit through the positive output terminal and the negative output terminal.

[0046] See Figure 3 , Figure 3 is the circuit diagram of the inverter circuit and the first current sensor assembly of a DC constant current power supply device provided by another embodiment of the present application.

[0047] As Figure 3As shown in the figure, the inverter circuit 102 may specifically include a first transistor N1, a second transistor N2, a third transistor N3, a fourth transistor N4, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a first isolated boost transformer T6-1, a second isolated boost transformer T6-2, a fifteenth capacitor C15, a sixteenth capacitor C16, a seventeenth capacitor C17, and an eighteenth capacitor C18; the first current sensor assembly 104 may specifically include a first current sensor T1, a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, a nineteenth capacitor C19, a twentieth capacitor C20, a twenty-fifth resistor R25, a twenty-sixth resistor R26, and a twenty-seventh resistor R27; wherein, the gate and source of the first transistor N1 are connected to the first output terminal of the main control circuit for outputting a driving signal through a first driving optocoupler, the gate is connected to the source through the twenty-first resistor R21, and the drain is respectively connected to the positive output terminal DC+ of the first rectifier circuit, connected to the negative output terminal DC- of the first rectifier circuit through the fifteenth capacitor C15, and connected to the negative output terminal DC- of the first rectifier circuit through the sixteenth capacitor C16; the gate and source of the second transistor N2 are connected to the second output terminal of the main control circuit for outputting a driving signal through a second driving optocoupler, the gate is connected to the source through the twenty-second resistor R22, the drain is respectively connected to the source of the first transistor N1 and the first end 1 of the first current sensor T1, and the source is connected to the negative output terminal DC- of the first rectifier circuit; the gate and source of the third transistor N3 are connected to the third output terminal of the main control circuit for outputting a driving signal through a third driving optocoupler, the drain is connected to the positive output terminal DC+ of the first rectifier circuit, and the source is respectively connected to the first input terminal of the first isolation transformer T6-1 and the first input terminal of the second isolation transformer T6-2 through the parallel-connected seventeenth capacitor C17 and eighteenth capacitor C18; the gate and source of the fourth transistor N4 are connected to the fourth output terminal of the main control circuit for outputting a driving signal through a fourth driving optocoupler, the gate is connected to the source through the twenty-fourth resistor R24, the drain is connected to the source of the third transistor N3, and the source is connected to the negative output terminal DC- of the first rectifier circuit; the four output terminals of the first isolation transformer T6-1 and the second isolation transformer T6-2 are respectively connected to the four input terminals of the second rectifier circuit; the second end 2 of the first current sensor T1 is respectively connected to the second input terminal of the first isolation transformer T6-1 and the second input terminal of the second isolation transformer T6-2, the third end 3 is respectively connected to the positive electrode of the fifth diode D5, the negative electrode of the sixth diode, and the first end of the twentieth capacitor C20, and the fourth end 4 is respectively connected to the second end of the twentieth capacitor C20, the positive electrode of the seventh diode D7, and the negative electrode of the eighth diode D8;The negative electrode of the fifth diode D5 is respectively connected to the output terminal Iout of the first current sensor assembly 104 through the twenty-fifth resistor R25, grounded through the twenty-fifth resistor R25 and the twenty-sixth resistor R26, grounded through the twenty-fifth resistor R25 and the nineteenth capacitor C19, grounded through the twenty-seventh resistor R27, and connected to the negative electrode of the seventh diode D7; the positive electrode of the sixth diode D6 is grounded; the positive electrode of the eighth diode D8 is grounded; the output terminal Iout is used to connect to the first input terminal of the current feedback circuit. Among them, the parallel-connected seventeenth capacitor C17 and eighteenth capacitor C18 are used to isolate the DC component in the second alternating current after inversion; the first isolation transformer T6-1 and the second isolation transformer T6-2 are used to step up and isolate the output of the second alternating current after inversion, so as to facilitate the reception and processing by the secondary rectification circuit. The second signal obtained by the first current sensor T1 collecting the second alternating current processed by the inverter circuit is output to the current feedback circuit through the output terminal Iout.;

[0048] Among them, the above-mentioned first current sensor may include a current sensor TA1410.

[0049] Among them, the specific implementation manners of the first transistor, the second transistor, the third transistor, and the fourth transistor respectively connected to the four-channel driving optocoupler may refer to the related art and will not be elaborated here.

[0050] See Figure 4 , Figure 4 is the circuit diagram of the second rectification circuit, the second current sensor assembly, and the voltage sensor assembly of a DC constant current power supply device provided by another embodiment of the present application.

[0051] Such as Figure 4As shown in the figure, the second rectifier circuit 103 may specifically include: a first inductor L1, a second inductor L2, a thirty-first resistor R31, a thirty-second resistor R32, a thirty-third resistor R33, a thirty-fourth resistor R34, a thirty-fifth resistor R35, a thirty-sixth resistor R36, a thirty-seventh resistor R37, a thirty-eighth resistor R38, a ninth diode D9, a tenth diode D10, an eleventh diode D11, a twelfth diode D12, a thirteenth diode D13, a fourteenth diode D14, a fifteenth diode D15, a sixteenth diode D16, a twenty-first capacitor C21, a twenty-second capacitor C22, a twenty-third capacitor C23, a twenty-fourth capacitor C24, a twenty-fifth capacitor C25, a twenty-sixth capacitor C26, a twenty-seventh capacitor C27, a twenty-eighth capacitor C28, a twenty-ninth capacitor C29, a thirtieth capacitor C30, a thirty-first capacitor C31, and a thirty-second capacitor C32; the second current sensor assembly 105 includes a second current sensor T2; the voltage sensor assembly 106 includes a voltage sensor T3, a thirty-third capacitor C33, a thirty-ninth resistor R39, a fortieth resistor R40, a forty-first resistor R41, and a forty-second resistor R42; wherein, the twenty-first capacitor C21 and the thirty-first resistor R31 are connected in series to form a first RC absorption circuit. Similarly, the twelfth capacitor C12 and the thirty-second resistor R32, the twenty-third capacitor C23 and the thirty-third resistor R33, the twenty-fourth capacitor C24 and the thirty-fourth resistor R34, the twenty-fifth capacitor C25 and the thirty-fifth resistor R25, the twenty-sixth capacitor C26 and the thirty-sixth resistor R36, the twenty-seventh capacitor C27 and the thirty-seventh resistor R37, and the twenty-eighth capacitor C28 and the thirty-eighth resistor R38 are respectively connected in series to form a second RC absorption circuit, a third RC absorption circuit, a fourth RC absorption circuit, a fifth RC absorption circuit, a sixth RC absorption circuit, a seventh RC absorption circuit, and an eighth RC absorption circuit; the first input terminal PACL1 is connected to the second input terminal PACN1 respectively through the ninth diode D9 and the first RC absorption circuit connected in parallel and the tenth diode D10 and the second RC absorption circuit connected in parallel, and is connected to the second input terminal PACN1 through the eleventh diode D11 and the third RC absorption circuit connected in parallel and the twelfth diode D12 and the fourth RC absorption circuit connected in parallel; the second input terminal PACN1 is connected to the positive output terminal V+ respectively through the second RC absorption circuit and the first inductor L1, and through the fourth RC absorption circuit and the twenty-ninth capacitor C29 and the thirtieth capacitor C30 connected in parallel;The third input terminal PACL2 is connected to the fourth input terminal PACN2 respectively through the thirteenth diode D13 and the fifth RC absorption circuit connected in parallel, and the fourteenth diode D14 and the sixth RC absorption circuit connected in parallel, and is connected to the fourth input terminal PACN2 through the fifteenth diode D15 and the seventh RC absorption circuit connected in parallel, and the sixteenth diode D16 and the eighth RC absorption circuit connected in parallel; the fourth input terminal PACN2 is connected to the positive output terminal V+ respectively through the sixth RC absorption circuit and the second inductor L2, and is connected to the positive output terminal V+ through the eighth RC absorption circuit and the thirty-first capacitor C31 and the thirty-second capacitor C32 connected in parallel, and is connected to the pin 6 of the second current sensor T2 through the eighth RC absorption circuit; the pin 7 of the second current sensor T2 is connected to the pin 5, the pin 8 is connected to the pin 4, the pin 9 is connected to the pin 3, the pin 10 is connected to the pin 2, the output pin M serves as the output terminal of the second current sensor assembly 105 for connecting to the second input terminal of the current feedback circuit, and the pin 1 is connected to the negative output terminal V- respectively and is connected to the positive output terminal V+ through the thirty-third capacitor C33; the pin +HL of the voltage sensor T3 is connected to the positive output terminal V+ through the thirty-ninth resistor R39 and the fortieth resistor R40; the pin -HL is connected to the negative output terminal V- through the forty-first resistor R41 and the forty-second resistor R42, the pin VEE is connected to the -15 power supply, the pin VCC is connected to the +15V power supply, and the output pin S serves as the output terminal of the voltage sensor assembly 106 to be connected to the second input terminal of the voltage feedback circuit. Wherein, the positive output terminal V+ and the negative output terminal V- are the output terminals of the second rectification circuit, that is, the output terminal Vout of the DC constant current power supply device. The first inductor L1 and the second inductor L2 are smoothing inductors. The twenty-ninth capacitor C29 and the thirtieth capacitor C30 connected in parallel and the thirty-first capacitor C31 and the thirty-second capacitor C32 connected in parallel form two LC filter circuits respectively for filtering out the high-frequency switching quantities in the second direct current after rectification.;

[0052] Among them, the second current sensor may include a Hall current sensor, and its model may be LEM LA28.

[0053] Among them, the voltage sensor may include a Hall voltage sensor, and its model may be LEM LV28.

[0054] See Figure 5 , Figure 5 which is the circuit diagram of the voltage feedback circuit of a DC constant current power supply device provided by another embodiment of the present application.

[0055] In some embodiments, such as Figure 5As shown, in order to achieve real-time regulation of the actual output power supply, the voltage feedback circuit 107 may specifically include a first inverse adder 1071 and a first PI regulator 1072 connected in series; the first inverse adder 1071 is also used to be respectively connected to a voltage sensor component and an external device, so as to perform inverse addition on the set signal provided by the external device and the first signal provided by the voltage sensor component, obtain a first control deviation and output it to the first PI regulator 1072; the first PI regulator 1072 is used to perform PI regulation based on the first control deviation, obtain a first feedback signal and output it to the current feedback circuit.

[0056] Among them, the first inverse adder 1071 may specifically include a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a first differential amplifier AJIA; among them, the inverting input terminal of the first differential amplifier AJIA is respectively connected to the external device through the first resistor R1, connected to the output terminal of the voltage sensor component through the second resistor R2, and connected to the output terminal of the first differential amplifier AJIA through the third resistor R3, the non-inverting input terminal is grounded through the fourth resistor R4, and the output terminal is also used to be connected to the first PI regulator; among them, the end connected to the external device is the first input terminal of the voltage feedback circuit, and the end connected to the voltage sensor component is the second input terminal of the voltage feedback circuit;

[0057] And / or, the first PI regulator 1072 may include a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first capacitor C1, a second capacitor C2, a first voltage stabilizing diode D1 and a second differential amplifier AJIB; among them, the inverting input terminal of the second differential amplifier AJIB is respectively connected to the output terminal of the first differential amplifier AJIB through the fifth resistor R5, connected to the first end of the sixth resistor R6 through the first capacitor C1, and connected to the first end of the sixth resistor R6 through the serially connected seventh resistor R7 and second capacitor C2, the non-inverting input terminal is grounded through the eighth resistor R8, and the output terminal is connected to the second end of the sixth resistor R6; the first end of the sixth resistor R6 is respectively connected to the negative electrode of the first voltage stabilizing diode D1 and the third input terminal of the current feedback circuit; the positive electrode of the first voltage stabilizing diode D1 is grounded, and the first end of the sixth resistor R6 is used as the output terminal of the voltage feedback circuit.

[0058] In specific implementation, the first signal obtained by collecting the second direct current by the voltage sensor component is processed by operational amplification to obtain the voltage outer loop feedback value. After performing reverse addition on the obtained voltage outer loop feedback value and the set value of the set signal obtained from an external device, the result is output to a PI regulator for PI regulation. Thus, a control deviation can be formed based on the set value and the actual output voltage feedback value. The deviation ratio and integral are linearly combined to form a control quantity, and the output value is controlled to obtain the output value of the voltage feedback circuit, that is, the first feedback signal. Subsequently, the output value of the voltage feedback circuit is output to the current feedback circuit through the output terminal of the voltage feedback circuit. In this way, the regulation of the voltage outer loop feedback is achieved, ensuring the real-time performance and accuracy of the regulation, and avoiding the occurrence of unstable actual output power supply situations.

[0059] See Figure 6 , Figure 6 FIG. is a circuit diagram of a current feedback circuit and a main control circuit of a DC constant current power supply device provided by another embodiment of the present application.

[0060] In some embodiments, as Figure 6 shown, in order to further achieve real-time regulation of the actual output power supply, the current feedback circuit 108 may specifically include a second reverse adder 1081 and a second PI regulator 1082 connected to each other; the second reverse adder 1081 is further configured to be connected to the voltage feedback circuit, the first current sensor component, and the second current sensor component respectively, to perform reverse addition on the first feedback signal provided by the voltage feedback circuit, the second signal provided by the first current sensor component, and the third signal provided by the second current sensor component, obtain a second control deviation, and output it to the second PI regulator 1082; the second PI regulator 1082 is further connected to the main control circuit 109, and is configured to perform PI regulation based on the second control deviation, obtain a second feedback signal, and output it to the main control circuit 109.

[0061] Among them, the second reverse adder 1082 may specifically include a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, and a third differential amplifier AJIC; the inverting input terminal of the third differential amplifier AJIC is respectively connected to the output terminal of the first current sensor assembly through the ninth resistor R9, connected to the output terminal of the second current sensor assembly through the tenth resistor R10, connected to the output terminal of the voltage feedback circuit through the eleventh resistor R11, and connected to the output terminal of the third differential amplifier AJIC through the twelfth resistor R12. The non-inverting input terminal is grounded through the thirteenth resistor R13, and the output terminal is also used to connect to the second PI regulator 1082; among them, the end connected to the output terminal of the first current sensor assembly is the first input terminal of the current feedback circuit 108, the end connected to the output terminal of the second current sensor assembly is the second input terminal of the current feedback circuit 108, and the end connected to the output terminal of the voltage feedback circuit is the third input terminal of the current feedback circuit 108;

[0062] And / or, the second PI regulator 1082 may include a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a third capacitor C3, a fourth capacitor C4, a second zener diode D2, and a fourth differential amplifier AJID; the inverting input terminal of the fourth differential amplifier AJID is respectively connected to the output terminal of the third differential amplifier AJIC through the fourteenth resistor R14, connected to the output terminal of the fourth differential amplifier AJID through the series-connected third capacitor C3 and fifteenth resistor R15, and connected to the output terminal of the fourth differential amplifier AJID through the series-connected sixteenth resistor R16, fourth capacitor C4, and fifteenth resistor R15. The non-inverting input terminal is grounded through the seventeenth resistor R17, and the output terminal is connected to the first end of the eighteenth resistor R18 through the fifteenth resistor R15 and connected to the negative electrode of the second zener diode D2; the positive electrode of the second zener diode D2 is grounded; the second end of the eighteenth resistor R18 is the output terminal of the current feedback circuit 108, which is used to connect to the main control circuit 109 and output a second feedback signal to the main control circuit 109.

[0063] Such as Figure 6As shown in the figure, the above-mentioned main control circuit 109 may specifically include a main control chip T4, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a twenty-eighth resistor R28, a twenty-ninth resistor R29, and a thirtieth resistor R30; the output end of the current feedback circuit 108 is connected to the pin EA+ of the main control chip T4 for providing a first feedback signal; the pin EA+ of the main control chip T4 is also grounded through the ninth capacitor C9, the pin EA- is connected to the pin EAO, the pin RAMP and the pin CT are grounded through the eleventh capacitor C11, the pin REF is grounded through the tenth capacitor C10, the pin GND is grounded, the pin RT is grounded through the twenty-eighth resistor R28, the pin EDLAB is grounded through the twenty-ninth resistor R29, the pin DELCD is grounded through the thirtieth resistor R30, the pin SS / SD is grounded through the fourteenth capacitor C14, the pin PGND and the pin ADS are grounded, the pin VCC is respectively connected to the power supply VCC and grounded through the twelfth capacitor C12 and the thirteenth capacitor C13 connected in parallel, and the pins OUTA, OUTB, OUTC, and OUTD are respectively used as the first output end, the second output end, the third output end, and the fourth output end for outputting driving signals of the main control circuit 109, and are used to respectively connect the first transistor, the second transistor, the third transistor, and the fourth transistor in the inverter circuit through four driving optocouplers to control the duty cycle of each transistor, so as to achieve the purpose of adjusting electric energy.

[0064] Among them, the main control chip may include, but is not limited to, a phase-shifted PWM controller UC3895N.

[0065] During specific implementation, after performing operational amplification processing on the second signal collected by the first current sensor assembly from the second alternating current processed by the inverter circuit, the current inner-loop feedback value can be obtained; after performing operational amplification processing on the third signal collected by the second current sensor assembly from the second direct current, the current outer-loop feedback value can be obtained. After performing reverse addition on the current inner-loop feedback value, the current outer-loop feedback value, and the output value of the voltage feedback circuit, the result is sent into the PI regulator to control the deviation again. The control value after PI regulation control is output to the main control circuit, and the main control circuit outputs corresponding four-way PWM waves in real time under the regulation of the input control value. The four-way PWM waves are fed back to the inverter circuit to regulate the real-time voltage in the inverter circuit. In this way, the effective regulation of the actual output power supply is achieved by using voltage outer-loop feedback, current inner-loop feedback, and current outer-loop feedback. This multiple-feedback parallel regulation method further realizes the precise and real-time regulation of the actual output power supply, and further ensures the stability of the output power supply.

[0066] In some embodiments, the DC constant current power supply device may further include a transistor drive circuit. The transistor drive circuit is respectively connected to the inverter circuit and the main control circuit, and is used to drive and isolate the drive signal output by the main control circuit and then output it to the inverter circuit.

[0067] Among them, the transistor drive circuit may include four optocouplers for driving.

[0068] In specific implementation, when the main control chip in the main control circuit is a phase-shifted PWM controller UC3895N, the input ends of the four optocouplers for driving are respectively connected to the four output pins OUTA, OUTB, OUTC, and OUTD of the main control chip, and the output ends are respectively connected to the gate and source of the first transistor, the gate and source of the second transistor, the gate and source of the third transistor, and the gate and source of the fourth transistor in the inverter circuit. During operation, as the first feedback signal received by the main control circuit changes, the PWM waves output by the four output pins OUTA, OUTB, OUTC, and OUTD of the main control chip change accordingly. After the four PWM modulation waveforms are sent into the transistor drive circuit and driven and isolated by the optocouplers for driving, they are output to the inverter circuit to drive the four transistors in the inverter circuit, thereby adjusting the duty cycle of the transistors and achieving voltage regulation. In this way, the purpose of stable and accurate power regulation can be achieved by adjusting the duty cycle of the transistors.

[0069] Among them, the optocoupler for driving can select the transistor gate drive optocoupler W343 with an output of 4A.

[0070] See Figure 7 , Figure 7 which is a schematic structural diagram of a DC constant current power supply device provided by another embodiment of the present application.

[0071] In some embodiments, as Figure 7 shown, the DC constant current power supply device 1 may further include a first interface 111. The first interface 111 is connected to the input end of the first rectifier circuit 101 and is used to connect to an external first alternating current.

[0072] In specific implementation, the first interface may be a plug. By inserting the plug into a socket connected to the mains, the mains can be accessed into the DC constant current power supply device, making the use of the DC constant current power supply device more convenient.

[0073] In some embodiments, the DC constant current power supply device 1 may further include a second interface 112. The second interface 112 is connected to the output end of the second rectifier circuit 103 and is used to output a second direct current to the load.

[0074] In specific implementation, the second interface may be a red and black terminal block. The red interface of the red and black terminal block is connected to the positive output terminal of the second rectifier circuit, and the black interface is connected to the negative output terminal of the second rectifier circuit. In this way, it is more convenient to provide an accurate and stable DC power supply for the earthquake ground resistivity observation system.

[0075] In some embodiments, in order to further ensure the stability of the actual output power supply, as Figure 7 shown, the above DC constant current power supply device 1 may further include a filter circuit 113. The filter circuit 113 is respectively connected to the second rectifier circuit 103 and the second interface 112, and is used to filter the second direct current output by the second rectifier circuit 103 and output it to the load. For example, the filter circuit may include a capacitor, and both ends of the capacitor are respectively connected to the positive output terminal and the negative output terminal of the second rectifier circuit to achieve the filtering function.

[0076] Specifically, the specific implementation manner of the filter circuit may refer to the existing related technologies according to actual needs, and will not be elaborated here.

[0077] In some embodiments, as Figure 7 shown, the DC constant current power supply device 1 may further include a numerical control circuit 114. The numerical control circuit 114 is connected to the first input terminal of the voltage feedback circuit 107, and is used to receive the set signal given by the external device and output it to the voltage feedback circuit 107.

[0078] Among them, the numerical control circuit may be composed of an ARM circuit and a communication circuit. The ARM chip may select STM32F103VCT6, and the communication chip may select MAX232.

[0079] In specific implementation, the set signal given by the external device can be received remotely or locally through the communication chip, and the set signal is processed by the ARM circuit for the voltage feedback circuit to receive and use.

[0080] In order to facilitate the establishment of a connection with the external device, in some embodiments, as Figure 7 shown, the DC constant current power supply device 1 may further include a communication interface 115 connected to the numerical control circuit 114, which is used to connect to the external communication interface of the external device to achieve communication docking with the external device.

[0081] Among them, the model of the communication interface can be set according to the actual needs of the external device, and is not limited here.

[0082] In order to facilitate the control of the on / off of the power supply of the DC constant current power supply device, in some embodiments, as Figure 7 shown, the DC constant current power supply device 1 may further include a switch 116.

[0083] In specific implementation, the setting position of the switch can be set according to actual requirements. For example, it can be set between the first interface and the first rectifying circuit. Closing the switch can supply power when power supply is needed, and opening the switch can end the power supply when power supply is not needed.

[0084] It can be understood that the same or similar parts in the above embodiments can be referred to each other, and the content not described in detail in some embodiments can be referred to the same or similar content in other embodiments.

[0085] It should be noted that in the description of the present application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present application, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0086] Any process or method description in the flowchart or described in other ways herein can be understood as representing a module, segment, or part of code including one or more executable instructions for implementing a specific logical function or process. And the scope of the preferred embodiments of the present application includes additional implementations, where the functions can be executed in a substantially simultaneous manner or in a reverse order according to the involved functions, rather than in the order shown or discussed, which should be understood by those skilled in the technical field of the embodiments of the present application.

[0087] It should be understood that each part of the present application can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one or a combination of the following well-known technologies in the art can be used: discrete logic circuits with logic gate circuits for implementing logical functions on data signals, application-specific integrated circuits with appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0088] Those of ordinary skill in the art of this technology can understand that all or part of the steps carried by the methods in the above embodiments can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

[0089] In addition, each functional unit in various embodiments of the present application may be integrated into a processing module, may exist physically alone for each unit, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0090] The above-mentioned storage medium may be a read-only memory, a magnetic disk, an optical disc, etc.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0092] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A DC constant current power supply device, characterized in that, it is applied to a seismic ground resistivity observation system, and the DC constant current power supply device includes: a first rectifier circuit, an inverter circuit, a second rectifier circuit, a first current sensor assembly, a second current sensor assembly, a voltage sensor assembly, a voltage feedback circuit, a current feedback circuit and a main control circuit; The first rectifier circuit is connected to the inverter circuit and is also used to access the external first alternating current; the inverter circuit is respectively connected to the first current sensor assembly, the second rectifier circuit and the main control circuit; the second rectifier circuit is connected to the second current sensor assembly and the voltage sensor assembly; the voltage feedback circuit is respectively connected to the voltage sensor assembly and an external device; the current feedback circuit is respectively connected to the first current sensor assembly, the second current sensor assembly, the voltage feedback circuit and the main control circuit; The first rectifier circuit is used to convert the first alternating current into a first direct current and output it to the inverter circuit; the inverter circuit is used to convert the first direct current into a second alternating current under the drive of the drive signal of the main control circuit and output it to the second rectifier circuit; the second rectifier circuit is used to convert the second alternating current into a second direct current and output it to the load; The voltage sensor assembly is used to collect the voltage of the second direct current, obtain a first signal and output it to the voltage feedback circuit; the voltage feedback circuit is used to generate a first feedback signal based on the set signal of the external device and the first signal and output it to the current feedback circuit; the first current sensor assembly is used to collect the current of the second alternating current, obtain a second signal and output it to the current feedback circuit; the second current sensor assembly is used to collect the current of the second direct current, obtain a third signal and output it to the current feedback circuit; The current feedback circuit is used to generate a second feedback signal based on the first feedback signal, the second signal and the third signal and send it to the main control circuit; The main control circuit is used to generate a drive signal based on the second feedback signal and output it to the inverter circuit; The current feedback circuit includes a second reverse adder and a second PI regulator connected in series; the second reverse adder is also used to be respectively connected to the voltage feedback circuit, the first current sensor assembly and the second current sensor assembly to perform reverse addition on the first feedback signal provided by the voltage feedback circuit, the second signal provided by the first current sensor assembly and the third signal provided by the second current sensor assembly to obtain a second control deviation and output it to the second PI regulator; the second PI regulator is also connected to the main control circuit and is used to perform PI regulation based on the second control deviation to obtain the second feedback signal and output it to the main control circuit; It further includes a first interface, and the first interface is connected to the input end of the first rectifier circuit and is used to connect the external first alternating current.

2. The DC constant current power supply device according to claim 1, It is characterized in that the voltage feedback circuit includes a first inverting adder and a first PI regulator connected to each other; the first inverting adder is further configured to be respectively connected to the voltage sensor assembly and the external device, so as to perform inverting addition on the set signal provided by the external device and the first signal provided by the voltage sensor assembly, obtain a first control deviation and output it to the first PI regulator; the first PI regulator is connected to the current feedback circuit, and is configured to perform PI regulation based on the first control deviation, obtain the first feedback signal and output it to the current feedback circuit.

3. The DC constant current power supply device according to claim 2 It is characterized in that the first inverting adder includes a first resistor, a second resistor, a third resistor, a fourth resistor and a first differential amplifier; wherein, the inverting input terminal of the first differential amplifier is respectively connected to the external device through the first resistor, connected to the output terminal of the voltage sensor assembly through the second resistor, and connected to the output terminal of the first differential amplifier through the third resistor, the non-inverting input terminal is grounded through the fourth resistor, and the output terminal is further configured to be connected to the first PI regulator; and / or, the first PI regulator includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor, a second capacitor, a first zener diode and a second differential amplifier; wherein, the inverting input terminal of the second differential amplifier is respectively connected to the output terminal of the first differential amplifier through the fifth resistor, connected to the first end of the sixth resistor through the first capacitor, and connected to the first end of the sixth resistor through the seventh resistor and the second capacitor, the non-inverting input terminal is grounded through the eighth resistor, and the output terminal is connected to the second end of the sixth resistor; the first end of the sixth resistor is further respectively connected to the negative electrode of the first zener diode and the current feedback circuit; the positive electrode of the first zener diode is grounded.

4. The DC constant current power supply device according to claim 1 It is characterized in that the second inverting adder includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor and a third differential amplifier; the inverting input terminal of the third differential amplifier is respectively connected to the output terminal of the first current sensor assembly through the ninth resistor, connected to the output terminal of the second current sensor assembly through the tenth resistor, connected to the output terminal of the voltage feedback circuit through the eleventh resistor, and connected to the output terminal of the third differential amplifier through the twelfth resistor, the non-inverting input terminal is grounded through the thirteenth resistor, and the output terminal is further configured to be connected to the second PI regulator; And / or, the second PI regulator includes a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a third capacitor, a fourth capacitor, a second zener diode, and a fourth differential amplifier; the inverting input terminal of the fourth differential amplifier is respectively connected to the output terminal of the third differential amplifier through the fourteenth resistor, connected to the output terminal of the fourth differential amplifier through the third capacitor and the fifteenth resistor, and connected to the output terminal of the fourth differential amplifier through the sixteenth resistor, the fourth capacitor, and the fifteenth resistor. The non-inverting input terminal is grounded through the seventeenth resistor. The output terminal is connected to the negative electrode of the second zener diode through the fifteenth resistor, and connected to the main control circuit through the fifteenth resistor and the eighteenth resistor; the positive electrode of the second zener diode is grounded.

5. The DC constant current power supply device according to claim 1, wherein, it further includes a second interface, and the second interface is connected to the output terminal of the second rectifying circuit for outputting the second direct current to the load.

6. The DC constant current power supply device according to claim 5, wherein, it further includes a filtering circuit, and the filtering circuit is respectively connected to the second rectifying circuit and the second interface for filtering the second direct current output by the second rectifying circuit and outputting it to the second interface.

7. The DC constant current power supply device according to claim 1, wherein, it further includes a transistor drive circuit, and the transistor drive circuit is respectively connected to the inverter circuit and the main control circuit for performing drive isolation on the drive signal output by the main control circuit and then outputting it to the inverter circuit.

8. The DC constant current power supply device according to claim 1, wherein, it further includes a numerical control circuit, and the numerical control circuit is connected to the voltage feedback circuit for receiving the set signal given by the external device and outputting it to the voltage feedback circuit.

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