dc-dc converter

Abstract

The present invention provides a DC-DC converter with a simple circuit structure and no redundant power supply circuit. Even if the switching transistor Tr1 works abnormally in an active state, it will continue to supply DC power to the load RL. Between the DC voltage conversion circuit unit having the first switching transistor and the DC input power supply, a protection circuit unit that steps down the input voltage of the DC input power supply and converts it into a different DC voltage similarly to the DC voltage conversion circuit unit is connected. When the one switching transistor operates in the active state, the first switching transistor is activated in the active state to supply the DC power of the DC voltage converted by the protection circuit unit to the load.

Description

technical field [0001] The invention relates to a DC-DC converter that converts a DC input voltage into a stable DC voltage suitable for a load through the opening and closing operation of a switching transistor. More specifically, it relates to a fault-tolerant switching transistor. function DC-DC converter. Background technique [0002] The DC-DC converter is a component that converts an unstable DC input voltage into a stable DC output voltage and outputs it to the load, and is used as a power supply for various electronic devices that work with DC voltage. According to its working principle, DC-DC converters are divided into insulation type that uses a transformer to increase and decrease the input voltage, and a switching transistor that interrupts the current flowing through the inductor and converts the DC input voltage into a DC output voltage of different voltage or polarity Non-isolated DC-DC converters that can be configured with relatively simple circuit element...

AI Technical Summary

Problems solved by technology

[0008] However, in a DC-DC converter that efficiently converts an input voltage into a DC output voltage by reducing the switching loss in the switching transistor Tr1 as much as possible, unlike power MOS and power transistors that take measures against heat dissipation, the Since the switching transistor Tr1 dissipates heat generated by the on-resistance, it may cause serious accidents such as fire due to heat generation

Moreover, even if the switching transistor Tr1 is in the active state, since the output voltage and output current do not greatly fluctuate from the set values, it is impossible to detect the abnormality of the switching transistor Tr1 in the active state from the outside, and the risk of fire is reduced. high

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