Downhole sensor voltage-multiplying high-voltage power supply circuit

Abstract

The utility model relates to a high-voltage power supply of a sensor, in particular to a voltage-multiplying high-voltage power supply circuit of an underground sensor, which comprises a controller, a voltage-multiplying circuit, a voltage-multiplying circuit, a voltage-multiplying circuit, a voltage-multiplying circuit, a voltage-multiplying circuit, a voltage-multiplying circuit, a voltage-multiplying circuit, a voltage-multiplying circuit, a voltage-multiplying circuit and a voltage-multiplying circuit, a PWM control signal is adjusted to control multiple voltages output by the voltage doubling circuit, and overcurrent protection is carried out; the voltage doubling circuit is used for converting the direct-current voltage into alternating-current voltage under the control of the PWM control signal and outputting multi-time voltage to the multi-time voltage acquisition and comparison circuit; the multi-time voltage acquisition and comparison circuit is used for reducing, following and comparing the multi-time voltage and sending a comparison signal to the controller; the technical scheme provided by the utility model can effectively overcome the defect that the multi-time voltage is difficult to adaptively adjust according to the load change condition in the prior art.

Description

TECHNICAL FIELD

[0001] The utility model relates to a sensor high voltage power supply, concretely relates to a downhole sensor voltage doubler high voltage power supply circuit. BACKGROUND

[0002] Many sensors in petroleum instruments, such as some types of pressure sensors, high-pressure sensors, etc., need high-voltage power supply to drive their normal work. High-voltage power supply can provide stable and accurate high-voltage output for such sensors, ensuring that the sensors can accurately perceive and detect target parameters. At the same time, in the process of oil exploration and exploitation, sensors need to transmit and receive various signals, such as pressure signals, temperature signals, etc., and high-voltage power supply can enhance the transmission and reception capability of these signals, improve the stability and accuracy of the signals.

[0003] The traditional voltage doubler rectifier circuit only raises the voltage to a specified amplitude through the voltage doubler circuit, cannot adapt to different load conditions, and usually adopts the parallel capacitor mode, resulting in large power supply ripple. SUMMARY

[0004] (I) Technical problems solved

[0005] In view of the above-mentioned shortcomings of the prior art, the utility model provides a downhole sensor voltage doubler high voltage power supply circuit, which can effectively overcome the defect that the prior art cannot adaptively adjust the multiple voltage size according to the load change.

[0006] (II) Technical solutions

[0007] To achieve the above purpose, the utility model realizes through the following technical solutions:

[0008] A downhole sensor voltage doubler high voltage power supply circuit, comprising a controller, a voltage doubler circuit and a multiple voltage acquisition comparison circuit;

[0009] The controller converts the direct current voltage into alternating current voltage by sending PWM control signals to the voltage doubler circuit, judges the load change condition according to the comparison signal sent by the multiple voltage acquisition comparison circuit, controls the multiple voltage output by the voltage doubler circuit through adjusting the PWM control signal, and carries out overcurrent protection;

[0010] The voltage doubler circuit converts the direct current voltage into alternating current voltage under the control of the PWM control signal, and outputs the multiple voltage to the multiple voltage acquisition comparison circuit;

[0011] The multiple voltage acquisition comparison circuit reduces, follows and compares the multiple voltage, and sends the comparison signal to the controller.

[0012] Preferably, the voltage doubling circuit comprises a field effect tube Q1 and a transformer T1, the gate of the field effect tube Q1 is connected to the controller, the drain of the field effect tube Q1 is connected to one end of the primary side of the transformer T1, the source of the field effect tube Q1 is grounded through a resistor R1, the other end of the primary side of the transformer T1 is connected to a power supply VCC, and the power supply VCC is grounded through a capacitor C1;

[0013] One end of the secondary side of the transformer T1 is connected to one end of a capacitor C2 and a capacitor C4, the other end of the capacitor C2 is connected to the anode of a diode D1 and the cathode of a diode D2, the cathode of the diode D1 is connected to the other end of the secondary side of the transformer T1, and the anode of the diode D2 is connected to the other end of the secondary side of the transformer T1 through a capacitor C3;

[0014] The other end of the capacitor C4 is connected to the anode of a diode D3 and the cathode of a diode D4, the cathode of the diode D3 is connected to the other end of the secondary side of the transformer T1 through a capacitor C3, the anode of the diode D4 is connected to the other end of the secondary side of the transformer T1 through a capacitor C5, the other end of the secondary side of the transformer T1 is grounded, the anode of the diode D4 is connected to one end of a resistor R2, and the other end of the resistor R2 is connected to a multiple voltage acquisition comparison circuit, i.e. multiple voltage-HV is output to the multiple voltage acquisition comparison circuit.

[0015] Preferably, the other end of the resistor R2 is connected to an RC filter circuit, and the RC filter circuit comprises a resistor R3, a resistor R4, a capacitor C6, and a capacitor C7, the other end of the resistor R2 is connected to the resistor R3, the resistor R3 is grounded through the capacitor C6, and the resistor R3 is grounded through the resistor R4 and the capacitor C7.

[0016] Preferably, the multiple voltage acquisition comparison circuit comprises an operational amplifier U1, a voltage follower U2, and a comparator U3, the non-inverting input terminal of the operational amplifier U1 is grounded, the inverting input terminal of the operational amplifier U1 is connected to the resistor R2, i.e. multiple voltage-HV, through a resistor R5, and the output terminal of the operational amplifier U1 is connected to its inverting input terminal through a resistor R6 and a capacitor C8, respectively.

[0017] The non-inverting input terminal of the voltage follower U2 is connected to the output terminal of the operational amplifier U1 through a resistor R7, and the output terminal of the voltage follower U2 is connected to its inverting input terminal.

[0018] The noninverting input end of the comparator U3 is connected to the output end of the voltage follower U2 through resistors R9 and R8, the controller is connected between the resistor R8 and the resistor R9, that is, the -HV_ADC signal is sent to the controller, the noninverting input end of the comparator U3 is grounded through resistor R10, and the inverting input end of the comparator U3 is connected to the threshold voltage VDD through resistor R11, and the output end of the comparator U3 is connected to the controller, that is, the comparison signal is sent to the controller.

[0019] (III) Advantages

[0020] Compared with the prior art, the downhole sensor voltage doubler high-voltage power supply circuit provided by the utility model, the controller converts the direct-current voltage into alternating-current voltage by sending the PWM control signal to the voltage doubler circuit, judges the load change condition according to the comparison signal sent by the multiple voltage acquisition comparison circuit, controls the multiple voltage output by the voltage doubler circuit through the adjustment of the PWM control signal, carries out the overcurrent protection, so that the adaptive adjustment of the multiple voltage size can be carried out according to the load change condition, intelligent adjustment and protection are realized, and the power supply ripple can be effectively reduced by using the RC filter circuit. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the premise of the drawings.

[0022] Figure 1 It is the circuit connection relationship schematic diagram of the utility model;

[0023] Figure 2 It is the circuit schematic diagram of the voltage doubler circuit in the utility model;

[0024] Figure 3 It is the circuit schematic diagram of the multiple voltage acquisition comparison circuit in the utility model. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantage of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0026] A downhole sensor voltage doubler high-voltage power supply circuit, as shown in Figure 1 including a controller, a voltage doubler circuit and a multiple voltage acquisition comparison circuit.

[0027] The controller converts the DC voltage into an AC voltage by sending a PWM control signal to the voltage doubler circuit, and judges the load change condition according to the comparison signal sent by the multiple voltage acquisition comparison circuit, controls the multiple voltage output by the voltage doubler circuit by adjusting the PWM control signal, and performs overcurrent protection.

[0028] The voltage doubler circuit converts the DC voltage into an AC voltage under the control of the PWM control signal, and outputs the multiple voltage to the multiple voltage acquisition comparison circuit.

[0029] The multiple voltage acquisition comparison circuit shrinks, follows and compares the multiple voltage, and sends a comparison signal to the controller.

[0030] ①As shown in Figure 2 , the voltage doubler circuit includes a field effect transistor Q1 and a transformer T1, the gate of the field effect transistor Q1 is connected to the controller, the drain of the field effect transistor Q1 is connected to one end of the primary side of the transformer T1, the source of the field effect transistor Q1 is connected to ground through a resistor R1, the other end of the primary side of the transformer T1 is connected to a power supply VCC, and the power supply VCC is connected to ground through a capacitor C1.

[0031] One end of the secondary side of the transformer T1 is connected to one end of a capacitor C2 and a capacitor C4, the other end of the capacitor C2 is connected to the anode of a diode D1 and the cathode of a diode D2, the cathode of the diode D1 is connected to the other end of the secondary side of the transformer T1, and the anode of the diode D2 is connected to the other end of the secondary side of the transformer T1 through a capacitor C3.

[0032] The other end of the capacitor C4 is connected to the anode of a diode D3 and the cathode of a diode D4, the cathode of the diode D3 is connected to the other end of the secondary side of the transformer T1 through a capacitor C3, the anode of the diode D4 is connected to the other end of the secondary side of the transformer T1 through a capacitor C5, the other end of the secondary side of the transformer T1 is connected to ground, the anode of the diode D4 is connected to one end of a resistor R2, and the other end of the resistor R2 is connected to the multiple voltage acquisition comparison circuit, i.e. the multiple voltage-HV is output to the multiple voltage acquisition comparison circuit.

[0033] The back end of the resistor R2 is connected to an RC filter circuit, and the RC filter circuit includes a resistor R3, a resistor R4, a capacitor C6 and a capacitor C7, the other end of the resistor R2 is connected to the resistor R3, the resistor R3 is connected to ground through the capacitor C6, and the resistor R3 is connected to ground through the resistor R4 and the capacitor C7.

[0034] ②As shown in Figure 3As shown, the multiple voltage acquisition comparison circuit includes operational amplifier U1, voltage follower U2 and comparator U3, the non-inverting input of the operational amplifier U1 is grounded, the inverting input of the operational amplifier U1 is connected to the resistance R2, i.e. to the multiple voltage-HV through the resistance R5, the output of the operational amplifier U1 is connected to its inverting input through the resistance R6 and the capacitor C8 respectively;

[0035] The non-inverting input of the voltage follower U2 is connected to the output of the operational amplifier U1 through the resistance R7, and the output of the voltage follower U2 is connected to its inverting input;

[0036] The non-inverting input of the comparator U3 is connected to the output of the voltage follower U2 through the resistance R9 and the resistance R8, the resistance R8 and the resistance R9 are connected to the controller, i.e. send the-HV_ADC signal to the controller, the non-inverting input of the comparator U3 is grounded through the resistance R10, and the inverting input of the comparator U3 is connected to the threshold voltage VDD through the resistance R11, and the output of the comparator U3 is connected to the controller, i.e. send the comparison signal to the controller.

[0037] In the technical scheme of the present application, the specific working process of the downhole sensor multiple voltage high voltage power supply circuit is as follows:

[0038] 1) The controller MCU converts the direct current voltage into alternating current voltage by sending the PWM control signal to the multiple voltage circuit, when the alternating current voltage is 1 positive and 2 negative (such as Figure 2 As shown), C2 is charged, and D1 is turned on; when the alternating current voltage is 2 positive and 1 negative, the 2 superimposed voltage charges C3, and D2 is turned on, so that one end of C3 is double VCC; when the alternating current voltage is 1 positive and 2 negative, the 1 superimposed voltage charges C4, and D3 is turned on, so that one end of C4 is three times VCC; when the alternating current voltage is 2 positive and 1 negative, the 2 superimposed voltage charges C5, and D4 is turned on, so that one end of C5 is four times VCC (theoretically, higher multiple voltage output can be achieved by superimposing multiple times);

[0039] 2) The controller MCU inversely amplifies the multiple voltage-HV to a certain multiple to reduce the amplitude to the amplitude that can be recognized by the controller MCU;

[0040] 3) The output result of the operational amplifier U1 enters the voltage follower U2, which plays a role of isolation protection, and then is compared with the threshold voltage VDD of the comparator U3, if the load becomes larger, the output result of the operational amplifier U1 becomes smaller, lower than the threshold voltage VDD, and the comparator U3 outputs low level; if the load becomes smaller, the output result of the operational amplifier U1 becomes larger, higher than the threshold voltage VDD, and the comparator U3 outputs high level;

[0041] 4) The controller MCU judges the load change condition by the high and low level (comparison signal) output by the comparator U3, thereby controlling the multiple voltage output by the voltage doubling circuit through adjusting the PWM control signal to perform overcurrent protection, and meanwhile the HV_ADC signal enters the controller MCU to perform real-time feedback on the high voltage output.

[0042] The above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A downhole sensor voltage multiplier high-voltage power supply circuit, characterized in that: Includes a controller, a voltage multiplier circuit, and a multiplier voltage acquisition and comparison circuit; The controller converts DC voltage into AC voltage by sending a PWM control signal to the voltage multiplier circuit. It also judges the load change based on the comparison signal sent by the voltage multiplier acquisition and comparison circuit, and controls the output voltage of the voltage multiplier circuit by adjusting the PWM control signal to perform overcurrent protection. The voltage multiplier circuit, under the control of the PWM control signal, converts DC voltage into AC voltage and outputs multiple voltages to the multiple voltage acquisition and comparison circuit; The multi-voltage acquisition and comparison circuit reduces, follows, and compares the multi-voltage, and sends a comparison signal to the controller.

2. The downhole sensor voltage multiplier high-voltage power supply circuit according to claim 1, characterized in that: The voltage multiplier circuit includes a field-effect transistor Q1 and a transformer T1. The gate of the field-effect transistor Q1 is connected to the controller, the drain of the field-effect transistor Q1 is connected to one end of the primary side of the transformer T1, the source of the field-effect transistor Q1 is grounded through a resistor R1, and the other end of the primary side of the transformer T1 is connected to the power supply VCC, which is grounded through a capacitor C1. One end of the secondary side of transformer T1 is connected to one end of capacitor C2 and capacitor C4. The other end of capacitor C2 is connected to the anode of diode D1 and the cathode of diode D2. The cathode of diode D1 is connected to the other end of the secondary side of transformer T1. The anode of diode D2 is connected to the other end of the secondary side of transformer T1 through capacitor C3. The other end of capacitor C4 is connected to the anode of diode D3 and the cathode of diode D4. The cathode of diode D3 is connected to the other end of the secondary side of transformer T1 through capacitor C3. The anode of diode D4 is connected to the other end of the secondary side of transformer T1 through capacitor C5. The other end of the secondary side of transformer T1 is grounded. The anode of diode D4 is connected to one end of resistor R2. The other end of resistor R2 is connected to the multi-voltage acquisition and comparison circuit, that is, the multi-voltage -HV is output to the multi-voltage acquisition and comparison circuit.

3. The downhole sensor voltage multiplier high-voltage power supply circuit according to claim 2, characterized in that: The resistor R2 is connected to an RC filter circuit, which includes resistors R3 and R4, capacitors C6 and C7. The other end of the resistor R2 is connected to resistor R3. Resistor R3 is grounded through capacitor C6 and resistor R4 and capacitor C7.

4. The downhole sensor voltage multiplier high-voltage power supply circuit according to claim 2, characterized in that: The multiple voltage acquisition and comparison circuit includes an operational amplifier U1, a voltage follower U2, and a comparator U3. The non-inverting input terminal of the operational amplifier U1 is grounded, and the inverting input terminal of the operational amplifier U1 is connected to a resistor R2 through a resistor R5, i.e., connected to the multiple voltage -HV. The output terminal of the operational amplifier U1 is connected to its inverting input terminal through a resistor R6 and a capacitor C8, respectively. The non-inverting input of the voltage follower U2 is connected to the output of the operational amplifier U1 through resistor R7, and the output of the voltage follower U2 is connected to its inverting input. The non-inverting input of comparator U3 is connected to the output of voltage follower U2 through resistors R9 and R8. Resistors R8 and R9 are connected to the controller, i.e., a -HV_ADC signal is sent to the controller. The non-inverting input of comparator U3 is grounded through resistor R10. The inverting input of comparator U3 is connected to the threshold voltage VDD through resistor R11. The output of comparator U3 is connected to the controller, i.e., a comparison signal is sent to the controller.

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