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
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[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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