Control method for power control circuit, power supply unit, power supply system, and power controller control method

Abstract

The present invention provides a control method for power control, power supply unit, power supply system, and power controller. A power control circuit, in a short-circuit fault of ''Lo Side FET'', detects a reference voltage (VD) which is the intermediate voltage between ''Hi Side FET'' and ''Lo Side FET'' and compares a threshold ''VIN-VrefH'' and the VD by use of a comparator (COMP)with each other. When the reference voltage (VD) is smaller than the threshold ''VIN-VrefH'' and a switching control signal (Hi Dr) is ON, the power control circuit judges that the short-circuit fault occurs. Similarly, the power control circuit, in a short-circuit fault of ''Hi Side FET'', detects the reference voltage (VD) between ''Hi Side FET'' and ''Lo Side FET'' and compares a threshold ''VrefL'' and the VD by use of a comparator (COMP)with each other. When the reference voltage (VD) is larger than the threshold ''VrefL'' and a switching control signal (Lo Dr) is ON, the power control circuit judges that the short-circuit fault occurs.

Description

technical field [0001] The invention relates to a power supply control circuit, a power supply device, a power supply system and a control method of the power supply control device. Background technique [0002] Conventionally, rectifying FETs (Field Effect Transistors: Field Effect Transistors) such as "Hi Side FETs" or "Lo Side FETs" have been used as power sources used in various electronic devices including information processing devices. [0003] For specific examples, such as Figure 27 As shown, a non-isolated DC-DC converter step-down circuit (switching control method) with input power supply, input capacitor, smoothing inductor, smoothing capacitor, load, Hi Side FET, Lo Side FET, inverter, etc. is used. This non-isolated DC-DC converter step-down circuit conducts on / off the input current by switching control signals (Hi Dr or Lo Dr) output from the Hi driver or Lo driver, and through smoothing inductors, smoothing capacitors, loads, The voltage / current is averaged...

AI Technical Summary

Problems solved by technology

That is, the entire device may stop due to a short-circuit fault

[0011] Moreover, in the existing protection circuit, when an impedance fault occurs, the voltage effect of the current sensing resistor Rsense1 (or current sensing resistor Rsense2) is very small or does not occur, so the impedance fault cannot be detected

As a result, there is a problem of causing heat loss

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