Adjustable direct-current high-voltage booster circuit, power supply circuit and electrical equipment

Abstract

The utility model provides an adjustable direct-current high-voltage booster circuit, a power supply circuit and electrical equipment, in the adjustable direct-current high-voltage booster circuit, a direct-current power supply input end is electrically connected with a primary first end of a transformer, and a voltage regulation control end is electrically connected with a first input end of a first comparator; the output end of the first comparator is electrically connected with the input end of the PWM control circuit, the output end of the PWM control circuit is electrically connected with the control end of the switching tube, and the primary second end of the transformer is grounded through the switching tube; the secondary side of the transformer is electrically connected with the input end of the voltage doubling rectifying circuit, the output end of the voltage doubling rectifying circuit is electrically connected with the direct-current high-voltage output end, the input end of the feedback circuit is electrically connected with the direct-current high-voltage output end, and the output end of the feedback circuit is electrically connected with the second input end of the first comparator. The adjustable direct-current high-voltage booster circuit can flexibly adjust high-voltage output, and the output voltage is stable.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of step -up circuit, specifically, relates to a kind of adjustable direct current high voltage step-up circuit, further relate to the power supply circuit of the adjustable direct current high voltage step-up circuit of application, further relate to the electrical equipment of the power supply circuit of application. BACKGROUND

[0002] When the various equipment of enterprise (such as chemical power plant, steel plant, chemical plant and pump station etc.) enters the trial run, start-up stage;As the main power equipment of device, the operation reliability of high-voltage motor is crucial, in order to meet the needs of daily operation stability, safety and reliability, in daily work, motor insulation must be tested frequently, to ensure that high-voltage motor can start and stop at any time to meet the daily production operation requirements. At present, for the occasions where high-voltage motor is used more in power plant, steel plant, chemical plant and pump station, we have developed high-voltage insulation on-line monitoring device, which can be used in 10kV and 10kV below high-voltage motor, submersible pump and other equipment, without disassembling wire, the insulation resistance of equipment to ground, interphase broken line measurement function can be measured;Realize on-line insulation monitoring, replace manual table measurement, improve work efficiency, reduce the risk of manual operation and other problems.

[0003] And high-voltage insulation on-line monitoring device usually needs continuous and stable power supply to ensure its normal operation, especially in some remote areas or complex power facilities site, reliable power acquisition has certain difficulty. And the traditional way of obtaining direct current high voltage has many limitations, for example, the early simple transformer step-up and rectification method, this way has great limitation to step-up multiple, and the turns ratio of transformer is determined once, the output voltage is basically fixed, it is difficult to realize flexible voltage regulation, lack of effective regulation mechanism, cannot dynamically adjust the output voltage according to the actual use, it is difficult to meet the diversified needs of different equipment for different direct current high voltage value, limit the full play of related equipment function and the expansion of application range.

[0004] Therefore, a more optimized step-up circuit needs to be considered. UTILITY MODEL CONTENTS

[0005] The first object of the utility model is to provide a kind of adjustable direct current high voltage step-up circuit with flexible high voltage output and stable output voltage.

[0006] The second object of the utility model is to provide a kind of power supply circuit with flexible high voltage output and stable output voltage.

[0007] The third object of the utility model is to provide a kind of electrical equipment with flexible high voltage output and stable output voltage.

[0008] In order to realize the above-mentioned first purpose, the adjustable DC high-voltage boost circuit provided by the utility model includes a DC power input end, a voltage regulation control end, a first comparator, a PWM control circuit, a transformer, a switching tube, a voltage doubler rectifier circuit, a feedback circuit and a DC high-voltage output end; the DC power input end is electrically connected with a primary first end of the transformer, the voltage regulation control end is electrically connected with a first input end of the first comparator, an output end of the first comparator is electrically connected with an input end of the PWM control circuit, an output end of the PWM control circuit is electrically connected with a control end of the switching tube, a primary second end of the transformer is grounded through the switching tube; a secondary of the transformer is electrically connected with an input end of the voltage doubler rectifier circuit, an output end of the voltage doubler rectifier circuit is electrically connected with the DC high-voltage output end, an input end of the feedback circuit is electrically connected with the DC high-voltage output end, and an output end of the feedback circuit is electrically connected with a second input end of the first comparator.

[0009] As can be seen from the above scheme, the adjustable DC high-voltage boost circuit of the utility model can flexibly adjust the output voltage of the DC high-voltage output end by setting the voltage regulation control end, the first comparator, the PWM control circuit, the transformer, the switching tube, the voltage doubler rectifier circuit, the feedback circuit and the DC high-voltage output end, so as to meet different voltage output requirements. At the same time, the feedback circuit is used to detect the voltage of the DC high-voltage output end and compare it with the voltage of the voltage regulation control end, so as to control the PWM control circuit to output a PWM signal to control the output voltage of the transformer, thereby realizing real-time monitoring and feedback of the current output voltage state and ensuring the stability and precision of the output voltage.

[0010] In a further scheme, the adjustable DC high-voltage boost circuit further includes an overcurrent protection circuit, an input end of the overcurrent protection circuit is electrically connected with the DC high-voltage output end, and the overcurrent protection circuit is used to ground the path between the first input end of the first comparator and the input end of the PWM control circuit when overcurrent occurs at the DC high-voltage output end.

[0011] As can be seen from the above scheme, by setting the overcurrent protection circuit, when overcurrent is detected at the DC high-voltage output end, the path between the first input end of the first comparator and the input end of the PWM control circuit is grounded, and protection action is taken in time, so as to ensure the safe and stable operation of the entire circuit and related equipment, prolong the service life of the circuit and improve the reliability of the entire system.

[0012] In a further scheme, the overcurrent protection circuit includes a second comparator and a first triode, a first input end of the second comparator is electrically connected with the DC high-voltage output end, an output end of the second comparator is electrically connected with a control end of the first triode, and the output end of the first comparator is grounded through the first triode.

[0013] As can be seen from the above scheme, the overcurrent protection circuit is composed of a comparator and a triode, which can accurately judge the overcurrent condition, efficiently execute the protection action, ensure the stability of the circuit and control the cost.

[0014] In a further aspect, the adjustable DC high-voltage boosting circuit further comprises a voltage stabilizing circuit, an input end of the voltage stabilizing circuit being electrically connected with the DC power input end, and a power supply end of the PWM control circuit being electrically connected with an output end of the voltage stabilizing circuit.

[0015] Therefore, by arranging the voltage stabilizing circuit, voltage fluctuation of the input power can be avoided, and a stable working voltage can be provided for the PWM control circuit, so that the PWM control circuit can generate the pulse width modulation signal for controlling the switching tube accurately depending on the stable voltage, and the output voltage stability and the adjustment precision of the boosting circuit are improved.

[0016] In a further aspect, the voltage stabilizing circuit comprises a first resistor, a second resistor, an NPN transistor and a voltage stabilizing diode, a collector of the NPN transistor being electrically connected with the DC power input end, a base of the NPN transistor being electrically connected with the DC power input end through the first resistor, an emitter of the NPN transistor being grounded through the second resistor, a negative electrode of the voltage stabilizing diode being electrically connected with the base of the NPN transistor, and a positive electrode of the voltage stabilizing diode being grounded.

[0017] Therefore, the voltage stabilizing circuit composed of the first resistor, the second resistor, the NPN transistor and the voltage stabilizing diode has simple structure and good voltage stabilizing performance, and provides a strong guarantee for stable operation of the adjustable DC high-voltage boosting circuit.

[0018] In a further aspect, the voltage doubling rectifier circuit is a multiple voltage doubling rectifier circuit.

[0019] Therefore, by adopting the multiple voltage doubling rectifier circuit, the output voltage can be increased to meet the demand of high-voltage output.

[0020] In a further aspect, a ratio of primary and secondary coil turns of the transformer is 1:10.

[0021] Therefore, by adopting the ratio of primary and secondary coil turns of 1:10, the input voltage of the transformer can be increased to meet the demand of voltage output.

[0022] In a further aspect, the feedback circuit comprises a voltage dividing circuit, an input end of the voltage dividing circuit being electrically connected with the DC high-voltage output end, and an output end of the voltage dividing circuit being electrically connected with the second input end of the first comparator.

[0023] Therefore, the voltage value of the DC high-voltage output end is relatively high, and the first comparator usually needs to receive a voltage signal in a proper range as a feedback input. By arranging the voltage dividing circuit, the set voltage signal input by the voltage regulating control end can be compared, so that effective transmission of the feedback signal and subsequent comparison and adjustment operation can be realized.

[0024] To achieve the above-mentioned second purpose, the utility model provides a power supply circuit includes adjustable direct current high voltage boost circuit, adjustable direct current high voltage boost circuit uses above-mentioned adjustable direct current high voltage boost circuit.

[0025] To achieve the above-mentioned third purpose, the utility model provides an electrical equipment includes power supply circuit, and power supply circuit uses above-mentioned power supply circuit. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the circuit schematic diagram of adjustable direct current high voltage boost circuit embodiment of the utility model.

[0027] Figure 2 It is Figure 1 The enlarged view of A in the middle.

[0028] Figure 3 It is Figure 1 The enlarged view of B in the middle.

[0029] Figure 4 It is Figure 1 The enlarged view of C in the middle.

[0030] Figure 5 It is Figure 1 The enlarged view of D in the middle.

[0031] The utility model is further explained below in combination with the drawings and examples. DETAILED DESCRIPTION

[0032] Adjustable direct current high voltage boost circuit embodiment:

[0033] As Figures 1 to 5 Shown, in the embodiment, adjustable direct current high voltage boost circuit includes direct current power input terminal 1, voltage regulation control end 2, first comparator 3, PWM control circuit 4, transformer T, switch tube M, voltage doubler rectifier circuit 5, feedback circuit 6 and direct current high voltage output terminal 7.Direct current power input terminal 1 is electrically connected with the primary first end of transformer T, voltage regulation control end 2 is electrically connected with the first input end of first comparator 3, the output end of first comparator 3 is electrically connected with the input end of PWM control circuit 4, the output end of PWM control circuit 4 is electrically connected with the control end of switch tube M, and the primary second end of transformer T is grounded through switch tube M.The secondary of transformer T is electrically connected with the input end of voltage doubler rectifier circuit 5, the output end of voltage doubler rectifier circuit 5 is electrically connected with direct current high voltage output terminal 7, the input end of feedback circuit 6 is electrically connected with direct current high voltage output terminal 7, and the output end of feedback circuit 6 is electrically connected with the second input end of first comparator 3.

[0034] The direct current power input end 1 is used for inputting a direct current voltage, and the voltage value of the direct current voltage can be set according to requirements. In the embodiment, the voltage value of the direct current voltage is 18V to 36V. The voltage regulating control end 2 is used for inputting a voltage regulating control voltage, and the voltage value of the voltage regulating control voltage input by the voltage regulating control end 2 is 0 to 5V. Preferably, the PWM control circuit 4 adopts a chip of the model of UC2843BD1013TR. The primary and secondary coil turn ratio of the transformer T is 1:10. The voltage doubling rectifier circuit 5 adopts a multiple voltage doubling rectifier circuit. In the embodiment, the voltage doubling rectifier circuit 5 adopts a three times voltage doubling rectifier circuit. The switching tube M adopts an NMOS tube.

[0035] In the embodiment, the feedback circuit 6 includes a voltage dividing circuit 61, the input end of the voltage dividing circuit 61 is electrically connected with the direct current high voltage output end 7, and the output end of the voltage dividing circuit 61 is electrically connected with the second input end of the first comparator 3. The voltage dividing circuit 61 is composed of a plurality of series resistors, and the number of the series resistors can be set according to the requirements of the first comparator 3. Since the voltage value of the direct current high voltage output end 7 is high, and the first comparator 3 usually needs to receive a voltage signal in a suitable range as a feedback input, the voltage dividing circuit 61 is set to compare with the set voltage signal input by the voltage regulating control end 2, so as to realize the effective transmission of the feedback signal and the subsequent comparison and adjustment operation.

[0036] In addition, in the embodiment, the adjustable direct current high voltage boosting circuit further includes an overcurrent protection circuit, the input end of the overcurrent protection circuit is electrically connected with the direct current high voltage output end 7, and the overcurrent protection circuit is used for grounding the path between the first input end of the first comparator 3 and the input end of the PWM control circuit 4 when overcurrent occurs at the direct current high voltage output end 7. Figure 2 It can be known that the overcurrent protection circuit includes a second comparator 8 and a first transistor Q1, the first input end of the second comparator 8 is electrically connected with the direct current high voltage output end 7, the output end of the second comparator 8 is electrically connected with the control end of the first transistor Q1, and the output end of the first comparator 3 is grounded through the first transistor Q1. In the embodiment, the first transistor Q1 adopts an NPN transistor. In addition, in order to simplify the circuit, the first comparator 3 and the second comparator 8 are realized by using a double-channel comparator chip. By setting the overcurrent protection circuit, when it is monitored that overcurrent occurs at the direct current high voltage output end 7, the path between the first input end of the first comparator 3 and the input end of the PWM control circuit 4 is grounded, and a protection action is taken in time, so as to guarantee the safe and stable operation of the whole circuit and related equipment, prolong the service life of the circuit, and improve the reliability of the whole system.

[0037] In the embodiment, the adjustable direct current high voltage boosting circuit further includes a voltage stabilizing circuit 9, the input end of the voltage stabilizing circuit 9 is electrically connected with the direct current power input end 1, and the power supply end of the PWM control circuit 4 is electrically connected with the output end of the voltage stabilizing circuit 9. Figure 3It can be known that the voltage stabilizing circuit 9 comprises the first resistor R1, the second resistor R2, the NPN triode Q2 and the voltage stabilizing diode D1, the collector of the NPN triode Q2 is electrically connected with the DC power input end 1, the base of the NPN triode Q2 is electrically connected with the DC power input end 1 through the first resistor R1, the emitter of the NPN triode Q2 is grounded through the second resistor R2, the negative electrode of the voltage stabilizing diode D1 is electrically connected with the base of the NPN triode Q2, and the positive electrode of the voltage stabilizing diode D1 is grounded. By arranging the voltage stabilizing circuit 9, the voltage fluctuation of the input power supply can be avoided, and a stable working voltage can be ensured to be provided for the PWM control circuit 4, so that the PWM control circuit 4 can rely on the stable voltage to accurately generate the pulse width modulation signal for controlling the switch tube M, and the output voltage stability and the adjustment precision of the voltage boosting circuit are improved.

[0038] In the working process of the adjustable DC high-voltage boosting circuit, the DC power input end 1 is powered, and when the voltage (0-5V) of the voltage regulating control end 2 is input, that is, the PWM control circuit 4 generates the PWM signal with adjustable duty ratio, the AC voltage is formed through the PWM signal, the AC voltage is sent into the transformer T with a certain number ratio, the AC voltage is changed into the high-voltage DC voltage through the voltage doubling rectifier circuit 5, and the high-voltage DC voltage is output through the DC high-voltage output end 7. At the same time, the current output voltage state of the DC high-voltage output end 7 is monitored and fed back through the feedback circuit 6, so that the output voltage is stable, and the adjustable DC high-voltage output in the preset voltage range (for example, the preset voltage range is 0-3000V) is ensured.

[0039] As known from the above, the adjustable DC high-voltage boosting circuit comprises the voltage regulating control end 2, the first comparator 3, the PWM control circuit 4, the transformer T, the switch tube M, the voltage doubling rectifier circuit 5, the feedback circuit 6 and the DC high-voltage output end 7, the output voltage of the DC high-voltage output end 7 can be flexibly adjusted by using the voltage regulating control end 2, and the voltage output demand in different voltage ranges can be met. At the same time, the voltage of the DC high-voltage output end 7 is detected by using the feedback circuit 6, and compared with the voltage of the voltage regulating control end 2, so that the PWM control circuit 4 is controlled to output the PWM signal to control the output voltage of the transformer T, so that the current output voltage state is monitored and fed back in real time, and the stability and precision of the output voltage are ensured.

[0040] Power supply circuit embodiment:

[0041] The power supply circuit of the embodiment comprises the adjustable DC high-voltage boosting circuit, and the adjustable DC high-voltage boosting circuit adopts the adjustable DC high-voltage boosting circuit of the above-mentioned embodiment.

[0042] Electrical equipment embodiment:

[0043] The electrical equipment of the embodiment comprises the power supply circuit, and the power supply circuit adopts the power supply circuit of the above-mentioned embodiment. The electrical equipment can be a handheld device or a high-voltage insulation on-line monitoring device.

[0044] It should be noted that the above is only the preferred embodiment of the present application, but the design concept of the present application is not limited thereto, and any non-essential modification of the present application using this concept also falls within the protection scope of the present application.

Claims

1. An adjustable DC high voltage boost circuit, characterized by: The adjustable DC high-voltage boost circuit comprises a DC power input end, a voltage regulation control end, a first comparator, a PWM control circuit, a transformer, a switch tube, a voltage doubling rectifier circuit, a feedback circuit and a DC high-voltage output end. The DC power input end is electrically connected with a primary first end of the transformer, the voltage regulation control end is electrically connected with a first input end of the first comparator, an output end of the first comparator is electrically connected with an input end of the PWM control circuit, an output end of the PWM control circuit is electrically connected with a control end of the switch tube, and a primary second end of the transformer is grounded through the switch tube. A secondary of the transformer is electrically connected with an input end of the voltage doubling rectifier circuit, an output end of the voltage doubling rectifier circuit is electrically connected with the DC high-voltage output end, an input end of the feedback circuit is electrically connected with the DC high-voltage output end, and an output end of the feedback circuit is electrically connected with a second input end of the first comparator.

2. The adjustable DC high-voltage boost circuit according to claim 1, wherein: The adjustable DC high-voltage boost circuit further comprises an overcurrent protection circuit, an input end of the overcurrent protection circuit is electrically connected with the DC high-voltage output end, and the overcurrent protection circuit is configured to ground a path between the first input end of the first comparator and the input end of the PWM control circuit when overcurrent occurs at the DC high-voltage output end.

3. The adjustable DC high-voltage boost circuit according to claim 2, wherein: The overcurrent protection circuit comprises a second comparator and a first triode, a first input end of the second comparator is electrically connected with the DC high-voltage output end, an output end of the second comparator is electrically connected with a control end of the first triode, and an output end of the first comparator is grounded through the first triode.

4. The adjustable DC high-voltage boost circuit according to claim 1, wherein: The adjustable DC high-voltage boost circuit further comprises a voltage stabilizing circuit, an input end of the voltage stabilizing circuit is electrically connected with the DC power input end, and a power supply end of the PWM control circuit is electrically connected with an output end of the voltage stabilizing circuit.

5. The adjustable DC high-voltage boost circuit according to claim 4, wherein: The voltage stabilizing circuit comprises a first resistor, a second resistor, an NPN triode and a voltage stabilizing diode, a collector of the NPN triode is electrically connected with the DC power input end, a base of the NPN triode is electrically connected with the DC power input end through the first resistor, an emitter of the NPN triode is grounded through the second resistor, a negative electrode of the voltage stabilizing diode is electrically connected with the base of the NPN triode, and a positive electrode of the voltage stabilizing diode is grounded.

6. The adjustable DC high-voltage boost circuit according to any one of claims 1 to 5, wherein: The voltage doubling rectifier circuit adopts a multiple voltage doubling rectifier circuit.

7. The adjustable DC high-voltage boost circuit according to any one of claims 1 to 5, wherein: A primary-secondary winding turns ratio of the transformer is 1:

10.

8. The adjustable DC high-voltage boost circuit according to any one of claims 1 to 5, wherein: The feedback circuit comprises a voltage dividing circuit, an input end of the voltage dividing circuit is electrically connected with the DC high voltage output end, and an output end of the voltage dividing circuit is electrically connected with the second input end of the first comparator.

9. A power supply circuit comprising an adjustable DC high voltage boost circuit, characterized in that: The adjustable DC high voltage boost circuit adopts the adjustable DC high voltage boost circuit according to any one of claims 1 to 8.

10. An electrical device comprising a power supply circuit, characterized in that: The power supply circuit adopts the power supply circuit according to claim 9.

Images