Power supply fuse alarm circuit and alarm apparatus

摘要

The present invention provides a power supply fuse alarm circuit and an alarm apparatus, where the alarm circuit is connected to a power access module of multiple combined paths and includes multiple groups of alarm units, and each of the alarm units includes: a voltage step-down module, which performs step-down processing on a voltage provided by the power access module, to output a working voltage applicable to the alarm circuit; a control module, which outputs a pulse control signal with a certain duty cycle in a case of normal power supply; a power consumption module, which generates an alarm blowing current according to the pulse control signal, so that the alarm blowing current serves as a virtual load to blow an alarm fuse by using the alarm blowing current after a main fuse is blown; and a protection module, which disconnects the power consumption module after a control circuit fails.

主权项

1. A power supply fuse alarm circuit, wherein the alaini circuit comprises multiple groups of alarm units, a forward input end and a reverse input end of each of the alarm units are connected to a power access module of multiple combined paths, and each of the alarm units comprises:
a voltage step-down module, wherein a forward input end of the voltage step-down module is the forward input end of the alarm unit and is connected to a forward power supply provided by the power access module, and a reverse input end of the voltage step-down module is the reverse input end of the alarm unit and is connected to a reverse power supply provided by the power access module; and the voltage step-down module is configured to perform step-down processing on a voltage provided by the power access module, to output a working voltage applicable to the alarm circuit; a control module, wherein a power supply end of the control module is connected to an output end of the voltage step-down module, and the control module is configured to output a pulse control signal with a certain duty cycle in a case of normal power supply; a power consumption module, wherein a first power supply end of the power consumption module is connected to the output end of the voltage step-down module, a second power supply end of the power consumption module is connected to the forward power supply provided by the power access module, and a control end of the power consumption module is connected to an output end of the control module; and the power consumption module is configured to generate an alarm blowing current according to the pulse control signal, so that the alarm blowing current serves as a virtual load to blow an alarm fuse by using the alarm blowing current after a main fuse is blown; and a protection module, wherein one end of the protection module is connected to the reverse power supply provided by the power access module, and the other end of the protection module is connected to an output end of the power consumption module, and the protection module is configured to, after a control circuit fails, disconnect the power consumption module to implement protection.