Patent ID: 9263889
Filing Date: 2016-02-16
CPC Classification: B60R,F02N,H02J,H02M,Y02T

Claim Text:
1. A power-supply device comprising: a booster circuit that is provided between a DC power supply and a load, the booster circuit supplying a voltage from the DC power supply to the load while boosting the voltage; a bypass element that is provided between the DC power supply and the load, the bypass element constituting a bypass path with respect to the booster circuit; a controller that, based on externally-input first and second signals, outputs a switching signal while controlling an operation of the booster circuit; and a switching circuit that switches a state of the bypass element based on the switching signal and the second signal, wherein the switching circuit switches the state of the bypass element such that the voltage is supplied from the DC power supply to the load through the bypass element when one or both of the switching signal and the second signal are not input to the switching circuit, wherein the switching circuit switches the state of the bypass element such that the voltage is supplied from the DC power supply to the load through the booster circuit when both the switching signal and the second signal are input to the switching circuit, wherein the bypass element is a normally-closed bypass relay that includes a coil and a contact, wherein the switching circuit comprises: wherein, when the fourth switch is turned on or off based on the second signal and the controller outputs the switching signal, the third switch is turned on, and the coil of the bypass relay is energized through the third switch to open the contact.