Patent ID: 9153959
Filing Date: 2015-10-06
Classification: H02H

Abstract:
1. A phase detection circuit for a multi-phase power supply, comprising: a first power input module connected to a first phase output terminal of the multi-phase power supply to convert a first pulse signal from the first phase output terminal into a direct current (DC) voltage; first to third power input terminals to provide high level signals; an alarm module; first to third electronic switches, wherein the first phase output terminal of the multi-phase power supply is connected to a first terminal of the first electronic switch through the first power input module, the first power input terminal is connected to the second terminal of the first electronic switch, a third terminal of the first electronic switch is grounded, the second terminal of the first electronic switch is also connected to a first terminal of the second electronic switch and a first terminal of the third electronic switch, the second power input terminal is connected to a second terminal of the second electronic switch, a third terminal of the second electronic switch is grounded, the third power input terminal is connected to a second terminal of the third electronic switch, a third terminal of the third electronic switch is grounded, the first power input module outputs a DC voltage to the first terminal of the first electronic switch when the multi-phase power supply operates normally, the second terminal of the first electronic switch is connected to the third terminal of the first electronic switch, the first terminals of the second and third electronic switches are grounded, the second terminal of the second electronic switch is disconnected from the third terminal of the second electronic switch, the second terminal of the third electronic switch is disconnected from the third terminal of the third electronic switch, when the multi-phase power supply operates abnormally, the first terminal of the first electronic switch receives low level signals and the second terminal of the first electronic switch is disconnected from the third terminal of the first electronic switch, the first terminals of the second and third electronic switches receive high level signals, the second terminal of the second electronic switch is connected to the third terminal of the second electronic switch, the second terminal of the third electronic switch is connected to the third terminal of the third electronic switch, the alarm module is connected either between the second power input terminal and the second terminal of the second electronic switch or between the third power input terminal and the second terminal of the third electronic switch, the alarm module is active; and a power management module to control the multi-phase power supply on or off, wherein a first pin of the power management module is connected to the second terminal of the second electronic switch, a second pin of the power management module is connected to the second terminal of the third electronic switch, when the first and second pins receive low level signals, the power management module turns off the multi-phase power supply.