DC-to-DC converter

Abstract

An object of the present disclosure is to provide a DC-to-DC converter with a simple circuit configuration that continues the supply of direct current power to a load without providing a redundant power supply circuit even if a switching transistor operates abnormally in the active state. A protection circuit unit that converts an input voltage of a direct current input power supply to a different direct current voltage obtained by stepping down the input voltage, as in a direct current voltage conversion circuit unit including a first switching transistor, is connected between the direct current voltage conversion circuit unit and the direct current input power supply and, if the first switching transistor operates in an active state, direct current power of the direct current voltage converted by the protection circuit unit is supplied to a load causing the first switching transistor to maintain operating in the active state.

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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