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DC power supply starting circuit applicable to high input impedance

A high input impedance, DC power technology, applied in the direction of output power conversion devices, electrical components, electronic switches, etc., to increase the start-up time, reduce the start-up current, and avoid heat damage.

Active Publication Date: 2016-11-09
贵州航天凯山石油仪器有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a DC power starting circuit suitable for high input impedance, to solve the problem of starting a switching power supply under high input impedance under heavy load

Method used

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  • DC power supply starting circuit applicable to high input impedance

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Embodiment

[0017] Refer to attached figure 1 , the present embodiment provides a DC power starting circuit suitable for high input impedance, including: an undervoltage protection circuit consisting of resistors R1, R2, R4 and Zener diodes V1 (75V), V3 (33V), V7 (18V) and Composed of MOS tube V4, resistor R1, Zener diodes V1, V3 and V7 are sequentially connected in series between the input terminal of the input voltage VIN of the switching power supply and the virtual ground GND, and the anodes of the Zener diodes V1, V3 and V7 are all connected to the virtual ground GND The D pole of the MOS transistor V4 is connected to the input terminal of the input voltage VIN of the switching power supply through the resistor R2, the S pole of the MOS transistor V4 is connected to the virtual ground GND through the resistor R4, and the G terminal of the MOS transistor V4 is connected to the Zener diode V3 The anode of the MOS transistor V4 is an n-channel MOS transistor, and a Zener diode is connec...

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Abstract

The invention provides a DC power supply starting circuit applicable to high input impedance. The access end of the input voltage VIN of a switching power supply is connected to the positive input end of an operational amplifier U1. The access end of the working voltage VCC of a switching power supply controller is connected to the negative input end of the operational amplifier U1. The output end of the operational amplifier U1 is connected to the output voltage Vo of the switching power supply. A delayed shutoff circuit is arranged between the output voltage Vo of the switching power supply and an under-voltage protection circuit. The DC power supply start-up circuit is provided in order to solve the problem that as deeper and deeper wells of oil fields need test, the power needed is higher and higher, it is hard to reduce the starting current of a switching power supply of a down-hole instrument under high temperature, high power and high input impedance, and there is no guarantee that the switching power supply can be started quickly. The DC power supply starting circuit belongs to the field of well logging instruments.

Description

technical field [0001] The invention relates to a starting circuit and belongs to the field of well logging instruments. Background technique [0002] In recent years, the wells that need to be tested in the oil field have become deeper and deeper, and the power supply power required is also increasing. How to reduce the starting current of the switching power supply of downhole instruments under high temperature, high power, and high input impedance, so as to ensure that the switching power supply can start quickly and successfully becomes a problem. more urgent. The impedance of the original armored cable is 20Ω / km, but the impedance of the steel pipe cable widely used in the oil field is above 90Ω / km. For power supply, it is also necessary to upload the downhole test data in real time through the cable. The starting instantaneous current of the switching power supply under full load is generally more than 5 times the rated current. Taking the rated current consumed by t...

Claims

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Application Information

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IPC IPC(8): H02M1/36H03K17/284
CPCH02M1/36H03K17/284
Inventor 余华曾勇胡世宇
Owner 贵州航天凯山石油仪器有限公司
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