METHOD AND APPARATUS FOR CONTINUOUS SHORT-CIRCUIT PROTECTION

摘要

A power-source protection circuit includes a power source including a first voltage rail and a second voltage rail, a pass switch connected across the first voltage rail and a third voltage rail, a control switch connected to the second voltage rail and a control terminal of the pass switch, such that the pass switch turns on in response to the control switch turning on and the pass switch turns off in response to the control switch turning off, and output terminals connected to the third voltage rail and the second voltage rail. The control switch is arranged to switch on when the power source is started and the control switch is arranged to switch off when the output terminals are short-circuited and to switch on when the short-circuit is removed.

主权项

1. A power-source protection circuit comprising:
a power source including a DC-DC converter with a Royer oscillator connected to a first voltage rail and a second voltage rail; a pass switch including a control terminal, a first terminal, and a second terminal, wherein the first terminal is directly connected to the first voltage rail and the second terminal is directly connected to a third voltage rail; a control switch including a control terminal, a first terminal, and a second terminal, wherein the first terminal of the control switch is directly connected to the second voltage rail, the second terminal of the control switch is connected to thee control terminal of the pass switch; such that the pass switch turns on in response to the control switch turning on and the pass switch turns off in response to the control switch turning off, and the control terminal of the control switch is either directly connected to the second terminal of the pass switch via the third voltage rail or directly connected to a first resistor that is directly connected to the second terminal of the pass switch via the third voltage rail; and output terminals connected to the third voltage rail and the second voltage rail; wherein the control switch is arranged to switch on when the power source is started; and the control switch is arranged to switch off when the output terminals are short-circuited and to switch on when the short-circuit is removed.