DC-DC CONVERTER

摘要

A DC-DC converter that is capable of cutting off a large current flowing in a voltage converter circuit when a short-circuit failure occurs in a switching element of the voltage converter circuit includes a voltage converter circuit having a first switching element, a reverse connection protection second switching element that blocks a large current from flowing in the voltage converter circuit when a negative electrode of a DC power supply is connected to an input terminal, a reverse connection protection third switching element that blocks a large current from flowing in the voltage converter circuit when a short-circuit failure occurs in the first switching element, and a detector that detects the short-circuit failure in the first switching element to turn off the third switching element. The third switching element is connected in series with the second switching element.

主权项

1. A DC-DC converter comprising:
an input terminal to which a positive electrode of a DC power supply is connected; an output terminal to which a load is connected; a voltage converter circuit that is disposed between the input terminal and the output terminal, has a first switching element, and boosts or steps down a voltage of the DC power supply depending on an on/off-operation of the first switching element to supply the voltage to the load; and a reverse connection protection second switching element that blocks a large current from flowing in the voltage converter circuit when the negative electrode of the DC power supply is connected to the input terminal, and further comprising: a short-circuit protection third switching element that blocks a large current from flowing in the voltage converter circuit when a short-circuit failure occurs in the first switching element; and a detector that detects the short-circuit failure in the first switching element to turn off the third switching element, wherein the third switching element is connected in series with the second switching element, and the detector detects a failure on the basis of a voltage at a connection point between the first switching element and a series circuit of the second and third switching elements.