6kV high-voltage power supply control circuit

Abstract

The utility model discloses a 6kV high-voltage power supply control circuit, which comprises a high-voltage power supply circuit, a positive / negative voltage sampling circuit, a first amplifier, a second amplifier, a filter circuit and a singlechip, the positive electrode of the high-voltage power supply circuit is connected to the negative electrode of the high-voltage power supply circuit through an ammeter and a load; the load is connected to the single-chip microcomputer through the filter circuit and the first amplifier, and the single-chip microcomputer is connected to the second amplifier through the filter circuit and outputs a control signal to be fed back to the high-voltage power supply circuit. Output of the high-voltage circuit is controlled by sampling voltage and current of a load end, and tracking adjustment of output of the whole high-voltage direct-current power supply circuit is achieved.

Description

Technical Field

[0001] The utility model relates to the field of circuit control, in particular to a 6kV high voltage power supply control circuit. Background Art

[0002] At present, Sanger sequencers usually use capillary electrophoresis technology to separate nucleic acid molecules of different molecular weights. In the process of capillary electrophoresis, electric injection is generally used, that is, a high-voltage electric field is added between the sample solution and the port of the capillary far away from the sample solution, so that the sample enters the capillary under the action of the electric field. This process has high requirements on the voltage and current accuracy of the high-voltage electric field, and the fluctuation range is usually within 0.003%. There is currently a lack of a control circuit that can stabilize the fluctuation of the high-voltage electric field. Therefore, the utility model provides a 6kV high-voltage power supply control circuit to solve the problems in the prior art. Utility Model Content

[0003] The utility model designs an intelligent control circuit for a 6kV high-voltage DC power supply, and designs an output tracking and regulating circuit according to the characteristics of the 6kV high-voltage power supply circuit. Regarding the design of the control circuit, a closed loop of sampling, feedback, and voltage regulation is mainly constructed with a single-chip microcomputer as the core. The output of the high-voltage circuit is controlled by sampling the voltage and current at the load end, thereby realizing tracking and regulating the output of the overall high-voltage DC power supply circuit.

[0004] A 6kV high-voltage power supply control circuit includes a high-voltage power supply circuit, a positive / negative voltage sampling circuit, a first amplifier, a second amplifier, a filter circuit and a single-chip microcomputer.

[0005] The positive / negative voltage sampling circuit includes an ammeter and a load.

[0006] The positive electrode of the high-voltage power supply circuit is connected to the negative electrode of the high-voltage power supply circuit via an ammeter and a load;

[0007] The load is connected to the single chip microcomputer via the filter circuit and the first amplifier.

[0008] The single chip microcomputer is connected to the second amplifier via a filter circuit, and the output control signal is fed back to the high voltage power supply circuit;

[0009] The sampling signal and the control signal output by the microcontroller are filtered. The filter circuit is mainly composed of resistors and capacitors. Its function is to obtain a stable DC voltage signal.

[0010] The positive / negative voltage sampling circuit is mainly composed of a low-power, high-resistance resistor and a digital display. When the circuit is working, it is connected in parallel with the load device. Because its internal resistance is large, the current flowing through it is very small, which will not affect the output high voltage. At the same time, it can also realize real-time monitoring of the power supply status, which is conducive to making appropriate adjustments according to specific circumstances.

[0011] The positive pressure sampling circuit includes a first resistor, a second resistor, a milliampere ammeter and a microampere ammeter.

[0012] The positive electrode of the high-voltage power supply circuit is connected in series with a first resistor, a milliampere ammeter, a load, a second resistor and a microampere ammeter, and outputs to the first amplifier.

[0013] The filter circuit includes a third resistor and a first capacitor,

[0014] The second resistor is connected in series with a microampere ammeter and then connected to the first amplifier via a third resistor.

[0015] The third resistor is grounded via the first capacitor.

[0016] The filter circuit unit further includes a fourth resistor and a second capacitor.

[0017] The first amplifier is connected to the single chip microcomputer via a fourth resistor and a second capacitor.

[0018] The negative pressure sampling circuit includes a microampere ammeter, a fifth resistor, a second resistor and a milliampere ammeter.

[0019] The positive electrode of the high-voltage power supply circuit is connected in series with a microampere ammeter, a fifth resistor and a second resistor to the negative electrode of the high-voltage power supply circuit.

[0020] The positive electrode of the high-voltage power supply circuit is connected in series with a milliampere ammeter and a load to the negative electrode of the high-voltage power supply circuit. The input end of the fifth resistor is connected to the single-chip microcomputer through a converter.

[0021] The converter is connected to a 12V power supply,

[0022] The output end of the fifth resistor is connected to the first amplifier,

[0023] The first amplifier is connected to a converter,

[0024] What is obtained at the high-voltage output end is negative high voltage, so the voltage obtained by sampling is also a negative signal. This negative signal needs to be converted into a corresponding positive signal before being transmitted to the microcontroller.

[0025] The filter circuit includes a third resistor and a first capacitor,

[0026] The input end of the fifth resistor is connected to the first amplifier through the first capacitor,

[0027] The output end of the fifth resistor is connected to the first amplifier through the third resistor,

[0028] The filter circuit unit further includes a fourth resistor and a second capacitor.

[0029] The first amplifier is connected to the single chip microcomputer via a fourth resistor and a second capacitor.

[0030] The first amplifier is connected to the single chip microcomputer through a compensation circuit.

[0031] The compensation circuit includes a first sliding resistor, a sixth resistor and a seventh resistor.

[0032] The first amplifier is connected in series with the first sliding resistor, the sixth resistor and the seventh resistor to the single chip microcomputer.

[0033] The second amplifying circuit unit includes a second amplifier,

[0034] The single chip microcomputer is connected in series to the second amplifier through an eighth resistor, a ninth resistor and a tenth resistor, and the filter circuit further includes an eleventh resistor, a third capacitor and a fourth capacitor.

[0035] The input end of the eleventh resistor is connected to the single chip microcomputer, and the output end is connected to one end of the third capacitor;

[0036] The other end of the third capacitor is connected to the output end of the eighth resistor, and the other end of the third capacitor is connected to one end of the fourth capacitor and grounded;

[0037] The output end of the ninth resistor is connected to the other end of the fourth capacitor and is connected to the second amplifier through the tenth resistor. The single-chip microcomputer plays a core role in the design of the high-voltage power supply control circuit. The single-chip microcomputer controls and adjusts the high-voltage output through sampling signals, so that the entire control system is in a closed-loop state.

[0038] Compared with the prior art, the beneficial effects of the utility model are:

[0039] 1. The utility model provides a positive and negative pressure sampling circuit, which is suitable for different sampling situations;

[0040] 2. The utility model is provided with a filter circuit after the sampling circuit, the amplifying circuit and the single-chip computer to ensure the stability of the DC voltage signal. The amplifying circuit isolates and amplifies the front and rear units;

[0041] 3. The single chip microcomputer controls and adjusts the high voltage output through the signal collected by the sampling circuit, so that the entire control system is in a closed loop state. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a positive voltage circuit diagram of a 6kV high voltage power supply control circuit in the utility model;

[0043] Figure 2 This is a circuit diagram of a positive voltage sampling end of a voltage measurement unit in a 6kV high voltage power supply control circuit in the utility model;

[0044] Figure 3 It is a negative voltage circuit diagram of a 6kV high voltage power supply control circuit in the utility model;

[0045] Figure 4 The utility model discloses a circuit diagram of a negative voltage sampling terminal of a voltage measurement unit in a 6kV high voltage power supply control circuit.

[0046] In the figure: R1, the first resistor, R2, the second resistor, R3, the third resistor, R4, the fourth resistor, R5, the fifth resistor, R6, the sixth resistor, R7, the seventh resistor, R8, the eighth resistor, R9, the ninth resistor, R10, the tenth resistor, R11, the eleventh resistor, R12, the twelfth resistor, R13, the thirteenth resistor, R14, the fourteenth resistor, R15, the fifteenth resistor,

[0047] RV1, the first sliding rheostat, RV2, the second sliding rheostat,

[0048] C1, the first capacitor, C2, the second capacitor, C3, the third capacitor, C4, the fourth capacitor. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] Embodiment 1:

[0051] like Figure 2 As shown, when the voltage collected by the serial port circuit is positive, the voltage sampling end is the output end of the microampere ammeter and the input end of the milliampere ammeter, and is input to the microcontroller:

[0052] like Figure 1 As shown, a 6kV high-voltage power supply control circuit includes a high-voltage power supply circuit, a positive / negative voltage sampling circuit, a first amplifier, a second amplifier, a filter circuit and a single-chip microcomputer.

[0053] The positive / negative voltage sampling circuit includes an ammeter and a load.

[0054] The positive pole of the high-voltage power supply circuit is connected to the negative pole of the high-voltage power supply circuit via an ammeter and a load;

[0055] The load is connected to the microcontroller via the filter circuit and the first amplifier.

[0056] The single chip microcomputer is connected to the second amplifier via a filter circuit, and the output control signal is fed back to the high voltage power supply circuit.

[0057] The voltage measurement unit includes a positive voltage sampling circuit,

[0058] The positive pressure sampling circuit includes a first resistor R1, a second resistor R2, a milliampere ammeter and a microampere ammeter.

[0059] The resistance of the first resistor R1 is 1KΩ, the resistance of the second resistor R2 is 1000MΩ, the model of the first amplifier is LM358, the model of the single-chip microcomputer is STM32,

[0060] The positive electrode of the high-voltage power supply circuit is connected in series with the first resistor R1, the milliampere ammeter, the load, the second resistor R2 and the microampere ammeter, and the output is sent to the pin 3 of the first amplifier LM358.

[0061] Pin 4 of the first amplifier is connected to the negative pole of the 12V power supply, and pin 8 is connected to the positive pole of the 12V power supply.

[0062] The filter circuit includes a third resistor R3 and a first capacitor C1.

[0063] The second resistor R2 is connected in series with a microampere ammeter and then connected to the first amplifier via a third resistor R3.

[0064] The third resistor R3 is grounded via the first capacitor C1.

[0065] The filter circuit also includes a fourth resistor R4 and a second capacitor C2.

[0066] The first amplifier 1 and 2 pins are connected in parallel to the microcontroller through the fourth resistor R4 and the second capacitor C2.

[0067] The resistance of the third resistor R3 is 1KΩ, the first capacitor C1 is 1uF, and the second capacitor C2 is 0.47uF.

[0068] The first amplifier is connected to the microcontroller through a compensation circuit.

[0069] The compensation circuit includes a first sliding resistor RV1, a sixth resistor R6 and a seventh resistor R7.

[0070] The first sliding rheostat RV1 is of model 3296W-203, with a resistance of 10KΩ, and the sixth resistor R6 and the seventh resistor R7 have a resistance of 10KΩ.

[0071] Pins 1 and 2 of the first amplifier are connected in series with the first sliding resistor RV1, the sixth resistor R6 and the seventh resistor R7 to the single chip microcomputer.

[0072] The output end of the sixth resistor R6 is connected in series with the input end of the fourth resistor R4.

[0073] The output end of the fourth resistor R4 is grounded and connected to the output end of the second capacitor C2.

[0074] The output end of the second capacitor C2 and the output end of the seventh resistor R7 are connected in parallel to the ADC_in pin of the single chip microcomputer.

[0075] The DAC_out pin of the single chip is connected in series to the second amplifier through the eighth resistor R8, the ninth resistor R9 and the tenth resistor R10. The second amplifier model is LM358. The filter circuit also includes the eleventh resistor R11, the third capacitor C3 and the fourth capacitor C4.

[0076] The resistance values ​​of the eighth resistor R8, the ninth resistor R9, the tenth resistor R10 and the eleventh resistor R11 are 10KΩ.

[0077] The third capacitor C3 is 0.1uF, the fourth capacitor C4 is 0.1uF,

[0078] The input end of the eleventh resistor R11 is connected to the DAC_out pin of the single chip microcomputer, and the output end is connected to one end of the third capacitor C3;

[0079] The other end of the third capacitor C3 is connected to the output end of the eighth resistor R8, and the other end of the third capacitor C3 is connected to one end of the fourth capacitor C4 and grounded;

[0080] The output end of the ninth resistor R9 is connected to the other end of the fourth capacitor C4, and is connected to the pin 3 of the second amplifier through the tenth resistor R10;

[0081] Pin 4 of the second amplifier is connected to the negative 12V terminal, and pin 8 is connected to the positive 12V terminal;

[0082] Pins 1 and 2 of the second amplifier are connected in parallel to the twelfth resistor R12 and grounded, and output a DAC control signal to the Vcon-in terminal of the high voltage power supply circuit;

[0083] The resistance of the twelfth resistor R12 is 10KΩ.

[0084] The positive pressure sampling circuit samples the voltage of the first resistor R1 in the uA level circuit connected in series with the load, and inputs it into the ADC_in input of the microcontroller after the front-stage precision operational amplifier and the back-stage amplification processing. The microcontroller outputs the DAC analog 0~3V / 6V signal to control the input of the high-voltage power supply Vcon-in, thereby realizing the closed-loop tracking and output regulation of the high-voltage voltage.

[0085] Embodiment 2:

[0086] like Figure 4 As shown, when the voltage collected by the serial port circuit is negative, the voltage sampling end is the two ends of the fifth resistor R5, and is input to the single chip microcomputer:

[0087] like Figure 3 As shown, a 6kV high-voltage power supply control circuit includes a high-voltage power supply circuit, a positive / negative voltage sampling circuit, a first amplifier, a second amplifier, a filter circuit and a single-chip microcomputer.

[0088] The positive / negative voltage sampling circuit includes an ammeter and a load.

[0089] The positive pole of the high-voltage power supply circuit is connected to the negative pole of the high-voltage power supply circuit via an ammeter and a load;

[0090] The load is connected to the microcontroller via the filter circuit and the first amplifier.

[0091] The single chip microcomputer is connected to the second amplifier via a filter circuit, and the output control signal is fed back to the high voltage power supply circuit.

[0092] The negative pressure sampling circuit includes a microampere ammeter, a fifth resistor R5, a second resistor R2 and a milliampere ammeter.

[0093] The resistance of the second resistor R2 is 1000MΩ, the resistance of the fifth resistor R5 is 100KΩ, and the model of the first amplifier is LM358.

[0094] The positive electrode of the high-voltage power supply circuit is connected in series with a microampere ammeter, a fifth resistor R5, and a second resistor R2 to the negative electrode of the high-voltage power supply circuit.

[0095] Connect the positive pole of the high-voltage power supply circuit in series with a milliampere ammeter and the load to the negative pole of the high-voltage power supply circuit.

[0096] The input terminals of the microampere meter and milliampere meter are grounded.

[0097] The input end of the fifth resistor R5 is connected to pin 3 of the converter, and the converter model is OP07.

[0098] Pin 6 of the converter is connected to the microcontroller, and pin 7 of the converter is connected to the positive pole of the 12V power supply.

[0099] Pins 1 and 8 of the converter are connected to pins 1 and 3 of the second sliding rheostat RV2 respectively, pin 7 of the converter is connected to pin 2 of the second sliding rheostat RV2, and pin 2 of the second sliding rheostat RV2 is connected to the positive pole of the 12V power supply.

[0100] The model of the second sliding rheostat RV2 is 3296W-203.

[0101] Pin 4 of the converter is connected to the negative terminal of the 12V power supply.

[0102] The output end of the fifth resistor R5 is connected to the pin 3 of the first amplifier through the thirteenth resistor R13.

[0103] The thirteenth resistor R13 is grounded through the fourteenth resistor R14.

[0104] The resistance of the thirteenth resistor R13 is 15KΩ, and the resistance of the fourteenth resistor R14 is 10KΩ.

[0105] The first amplifier is connected to the converter.

[0106] The filter circuit includes a third resistor R3 and a first capacitor C1.

[0107] The input end of the fifth resistor R5 is connected to the input end of the third resistor R3.

[0108] The output end of the fifth resistor R5 is connected to the input end of the first capacitor C1.

[0109] The output end of the first capacitor C1 and the output end of the third resistor R3 are connected in parallel to the pin 3 of the first amplifier.

[0110] The filter circuit also includes a fourth resistor R4 and a second capacitor C2.

[0111] The output end of the fourth resistor R4 and the input end of the second capacitor C2 are connected to the ground in parallel.

[0112] The first amplifier is connected to the single chip microcomputer via the fourth resistor R4 and the second capacitor C2.

[0113] The resistance of the third resistor R3 is 1KΩ, the first capacitor C1 is 1uF, and the second capacitor C2 is 0.47uF.

[0114] The first amplifier is connected to the microcontroller through a compensation circuit.

[0115] The compensation circuit includes a first sliding resistor RV1, a sixth resistor R6 and a seventh resistor R7.

[0116] The first sliding rheostat RV1 is of model 3296W-203, with a resistance of 10KΩ, and the sixth resistor R6 and the seventh resistor R7 have a resistance of 10KΩ.

[0117] The first amplifier is connected in series with the first sliding resistor RV1, the sixth resistor R6 and the seventh resistor R7 to the single chip microcomputer.

[0118] Pins 1 and 2 of the first amplifier are connected in parallel to the first sliding resistor RV1.

[0119] The sixth resistor R6 is connected to the pin 6 of the converter via the seventh resistor R7 and is connected to the microcontroller via another fifteenth resistor R15. Both ends of the fifteenth resistor R15 are respectively connected to the input end of the fourth resistor R4 and the output end of the second capacitor C2.

[0120] The second amplifying circuit unit includes a second amplifier, the second amplifier model is LM358,

[0121] The DAC_out pin of the single chip is connected in series to the second amplifier through the eighth resistor R8, the ninth resistor R9 and the tenth resistor R10. The third filtering circuit includes the eleventh resistor R11, the third capacitor C3 and the fourth capacitor C4.

[0122] The resistance values ​​of the eighth resistor R8, the ninth resistor R9, the tenth resistor R10 and the eleventh resistor R11 are 10KΩ.

[0123] The third capacitor C3 is 0.1uF, the fourth capacitor C4 is 0.1uF,

[0124] The input end of the eleventh resistor R11 is connected to the DAC_out pin of the single chip microcomputer, and the output end is connected to one end of the third capacitor C3;

[0125] The other end of the third capacitor C3 is connected to the output end of the eighth resistor R8, and the other end of the third capacitor C3 is connected to one end of the fourth capacitor C4 and grounded;

[0126] The output end of the ninth resistor R9 is connected to the other end of the fourth capacitor C4, and is connected to the pin 3 of the second amplifier through the tenth resistor R10;

[0127] Pin 4 of the amplifier is connected to the negative terminal of 12V, and pin 8 is connected to the positive terminal of 12V.

[0128] Pins 1 and 2 of the second amplifier are connected in parallel to the twelfth resistor R12 and grounded, and output a DAC control signal to the Vcon-in terminal of the high voltage power supply circuit;

[0129] The resistance of the twelfth resistor R12 is 10KΩ.

[0130] The negative pressure sampling circuit samples the voltage of the fifth resistor R5 in the uA level circuit connected in parallel with the load, and after the front-stage precision operational amplifier and the post-stage amplification processing, it is input into the ADC_in input of the microcontroller. The microcontroller outputs the DAC analog 0~3V / 6V signal to control the input of the high-voltage power supply Vcon-in, thereby realizing the closed-loop tracking and output regulation of the high-voltage voltage.

[0131] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A 6kV high voltage power supply control circuit, comprising a high voltage power supply circuit, characterized in that: It also includes a positive / negative voltage sampling circuit, a first amplifier, a second amplifier, a filter circuit and a single chip microcomputer. The positive / negative voltage sampling circuit includes an ammeter and a load. The positive electrode of the high-voltage power supply circuit is connected to the negative electrode of the high-voltage power supply circuit via an ammeter and a load; The load is connected to the single chip microcomputer via the filter circuit and the first amplifier. The single chip microcomputer is connected to the second amplifier via a filter circuit, and the output control signal is fed back to the high voltage power supply circuit.

2. A 6kV high voltage power supply control circuit according to claim 1, characterized in that: The positive pressure sampling circuit in the positive / negative pressure sampling circuit comprises a first resistor (R1), a second resistor (R2), a milliampere ammeter and a microampere ammeter. The positive electrode of the high-voltage power supply circuit is connected in series with a first resistor (R1), a milliampere ammeter, a load, a second resistor (R2) and a microampere ammeter, and outputs to the first amplifier.

3. A 6kV high voltage power supply control circuit according to claim 2, characterized in that: The filter circuit includes a third resistor (R3) and a first capacitor (C1), The second resistor (R2) is connected in series with a microampere ammeter and then connected to the first amplifier via a third resistor (R3). The third resistor (R3) is grounded via the first capacitor (C1), The filter circuit further includes a fourth resistor (R4) and a second capacitor (C2), The first amplifier is connected to the single chip microcomputer via a fourth resistor (R4) and a second capacitor (C2).

4. A 6kV high voltage power supply control circuit according to claim 1, characterized in that: The negative pressure sampling circuit in the positive / negative pressure sampling circuit comprises a microampere ammeter, a fifth resistor (R5), a second resistor (R2) and a milliampere ammeter, The positive electrode of the high-voltage power supply circuit is connected in series with a microampere ammeter, a fifth resistor (R5) and a second resistor (R2) to the negative electrode of the high-voltage power supply circuit. The positive electrode of the high-voltage power supply circuit is connected in series with a milliampere ammeter and a load to the negative electrode of the high-voltage power supply circuit. The input end of the fifth resistor (R5) is connected to the single chip microcomputer through a converter. The converter is connected to a 12V power supply, The output end of the fifth resistor (R5) is connected to the first amplifier, The first amplifier is connected to the converter.

5. A 6kV high voltage power supply control circuit according to claim 4, characterized in that: The filter circuit includes a third resistor (R3) and a first capacitor (C1), The input end of the fifth resistor (R5) is connected to the first amplifier through the first capacitor (C1), The output end of the fifth resistor (R5) is connected to the first amplifier through the third resistor (R3), The filter circuit unit further includes a fourth resistor (R4) and a second capacitor (C2), The first amplifier is connected to the single chip microcomputer via a fourth resistor (R4) and a second capacitor (C2).

6. A 6kV high voltage power supply control circuit according to any one of claims 1 to 5, characterized in that: The first amplifier is connected to the single chip microcomputer through a compensation circuit. The compensation circuit includes a first sliding resistor (RV1), a sixth resistor (R6) and a seventh resistor (R7), The first amplifier is connected in series with a first sliding rheostat (RV1), a sixth resistor (R6) and a seventh resistor (R7) to the single chip microcomputer.

7. A 6kV high voltage power supply control circuit according to any one of claims 1 to 5, characterized in that: The single chip microcomputer is connected in series to the second amplifier via an eighth resistor (R8), a ninth resistor (R9) and a tenth resistor (R10), and the filter circuit further comprises an eleventh resistor (R11), a third capacitor (C3) and a fourth capacitor (C4), The input end of the eleventh resistor (R11) is connected to the single chip microcomputer, and the output end is connected to one end of the third capacitor (C3); The other end of the third capacitor (C3) is connected to the output end of the eighth resistor (R8), and the other end of the third capacitor (C3) is connected to one end of the fourth capacitor (C4) and grounded; The output end of the ninth resistor (R9) is connected to the other end of the fourth capacitor (C4), and is connected to the second amplifier through the tenth resistor (R10).

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