Abstract: A monolithic bus slave circuit structure is provided, including: a monolithic integrated chip, a rectifier bridge, a first light circuit, a second light circuit, and a third light circuit. The monolithic integrated chip includes a bus voltage input pin, a ground pin, a first drive signal output pin, a second drive signal output pin, a third drive signal output pin, and a power output pin. Both the bus voltage input pin and the ground pin are connected to an output end of the rectifier bridge, two input ends of the rectifier bridge are connected to a positive line and an negative line of a bus respectively, the ground pin is grounded. The monolithic bus slave circuit structure realizes the intelligent constant current drive function and drive the light circuits with constant current in the voltage range of the whole bus, which does not depend on the parameters of the LEDs.

Abstract: A monolithic bus slave circuit structure is provided, including: a monolithic integrated chip, a rectifier bridge, a first light circuit, a second light circuit, and a third light circuit. The monolithic integrated chip includes a bus voltage input pin, a ground pin, a first drive signal output pin, a second drive signal output pin, a third drive signal output pin, and a power output pin. Both the bus voltage input pin and the ground pin are connected to an output end of the rectifier bridge, two input ends of the rectifier bridge are connected to a positive line and an negative line of a bus respectively, the ground pin is grounded. The monolithic bus slave circuit structure realizes the intelligent constant current drive function and drive the light circuits with constant current in the voltage range of the whole bus, which does not depend on the parameters of the LEDs.

Abstract: A constant current driving circuit and a corresponding photoelectric smoke alarm circuit are provided. The constant current driving circuit includes a reference voltage source module (1), a linear voltage regulator module (3), a level conversion module (2), a current mirror module (4) and a first NMOS transistor. The linear voltage regulator module (3) may control turning on and turning off thereof according to actual requirements, thus electrical energy loss may effectively be reduced for some periodically used devices. The constant current driving circuit and the corresponding photoelectric smoke alarm circuit may provide a constant current source, so that auxiliary output performance remains stable within a full temperature range, a certain timing sequence requirement is met, no standby power is consumed when not working, performance is stable, power consumption is low, and application range is wide.

Abstract: A constant current driving circuit and a corresponding photoelectric smoke alarm circuit are provided. The constant current driving circuit includes a reference voltage source module (1), a linear voltage regulator module (3), a level conversion module (2), a current mirror module (4) and a first NMOS transistor. The linear voltage regulator module (3) may control turning on and turning off thereof according to actual requirements, thus electrical energy loss may effectively be reduced for some periodically used devices. The constant current driving circuit and the corresponding photoelectric smoke alarm circuit may provide a constant current source, so that auxiliary output performance remains stable within a full temperature range, a certain timing sequence requirement is met, no standby power is consumed when not working, performance is stable, power consumption is low, and application range is wide.

Abstract: A discharge circuit integrated in a chip of a slave device to follow a bus rectifier bridge includes: a digital control module for generating, when an output result of a comparator is that a bus voltage falls, a high-level and time-configurable pulse width to drive a discharge circuit to discharge a bus; a discharge current source module for enabling the discharge of the bus by means of a digital control module and adjusting a discharge current; a comparator for obtaining a status of a change in the bus voltage; and a peripheral circuit for monitoring the change in the bus voltage, providing to the comparator a voltage signal which reflects divided bus voltage fall information, and generating a comparison reference voltage.

Abstract: A discharge circuit integrated in a chip of a slave device to follow a bus rectifier bridge includes: a digital control module for generating, when an output result of a comparator is that a bus voltage falls, a high-level and time-configurable pulse width to drive a discharge circuit to discharge a bus; a discharge current source module for enabling the discharge of the bus by means of a digital control module and adjusting a discharge current; a comparator for obtaining a status of a change in the bus voltage; and a peripheral circuit for monitoring the change in the bus voltage, providing to the comparator a voltage signal which reflects divided bus voltage fall information, and generating a comparison reference voltage.