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A high-power DC power supply with sense self-test protection function

A technology of DC power supply and protection function, which is applied to emergency protection circuit devices, output power conversion devices, electrical components, etc., can solve the problems of burning SENSE resistance, inaccurate output voltage of DC power supply, and failure of the whole machine to work normally. The effect of avoiding burnout and preventing false output

Active Publication Date: 2018-11-27
ITECH ELECTRONICS NANJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in actual operation, the SENSE line will be reversed. The above SENSE compensation will not work properly when the SENSE line is reversed, resulting in inaccurate output voltage of the DC power supply, and even burning the SENSE resistor so that the whole machine cannot work normally.

Method used

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  • A high-power DC power supply with sense self-test protection function
  • A high-power DC power supply with sense self-test protection function
  • A high-power DC power supply with sense self-test protection function

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Embodiment Construction

[0028] The technical solution of the invention will be described in detail below in conjunction with the accompanying drawings.

[0029] Traditional high-power DC power supplies such as image 3 Shown, including: voltage differential sampling unit, error amplifier, PWM generator. The voltage differential sampling unit performs differential sampling on the voltage at the input terminal of the load. The error amplifier detects the error VE between the voltage VS at the input terminal of the load and the set value VSET of the output voltage of the DC power supply. The ramp signal VRAMP generates PWM to adjust the output voltage of the DC power supply to drive the DC power supply.

[0030] It is known from common sense that the resistance design principle of Rsense is determined by the expression VOMAX*K / I. In engineering, K is 1%, and I is 1mA, then Rsense=VOMAX*1% / 1mA=10VOMAX, and the power PRSET of the Rsense resistor is designed as : PRSET=1mA*1mA*Rsense=0.00001VOMAX. Depen...

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Abstract

The invention discloses a high-power direct-current power supply with a SENSE self-checking protection function, belonging to the technical field of direct-current power supplies. The DC power supply includes: a voltage differential sampling unit, a voltage error amplifier, a current sensor, a SENSE self-test protection function unit, a PWM generator, and a SENSE reverse interface. The power supply collects the load input terminal voltage and load current when it is turned on, and turns off the PWM when the SENSE line is reversed to avoid the rapidly saturated voltage error signal causing the DC power supply to work in the maximum voltage output mode, thereby preventing the SENSE resistor from being burned due to overpower When the load current exceeds its set value, it reminds the user to reduce the set value of the load current and perform self-test again, and the user is not allowed to perform relevant settings and output work until the whole machine passes the SENSE self-test.

Description

technical field [0001] The invention discloses a high-power direct-current power supply with a SENSE self-checking protection function, belonging to the technical field of direct-current power supplies. Background technique [0002] Such as figure 1 As shown, the traditional high-power DC power supply supplies power to the load through the wire. The certain impedance of the wire itself will produce a certain voltage drop when the supply current is large, which causes the voltage displayed by the DC power supply to accurately represent the local voltage and cannot be accurate. Ground represents the remote (load terminal) voltage. Assuming that the load needs to provide the voltage of Vo, the output voltage is set to Vo on the DC power supply, but the line loss on the cable connecting the DC power supply and the load makes the voltage loaded on both ends of the load not necessarily Vo, and the voltage Vi of the load input terminal is The difference between the voltage it nee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H11/00H02M1/00
CPCH02H11/002H02M1/00H02M1/0003H02M1/0009
Inventor 不公告发明人
Owner ITECH ELECTRONICS NANJING
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