Single-input double-output pulse width modulation (PWM) signal producing circuit

Abstract

The invention discloses a single-input double-output pulse width modulation (PWM) signal producing circuit, comprising a phase inverter (101), a regulating circuit (102), a first PWM output circuit (105) and a second PWM output circuit (106), wherein the phase inverter (101) is connected with a PWM port of a microcontroller; the regulating circuit (102) is electrically connected with the phase inverter (101); the first PWM output circuit (105) is electrically connected with the regulating circuit (102) and a first reference circuit (103); the second PWM output circuit (106) is connected with the regulating circuit (102) and a second reference circuit (104); one end of the first reference circuit (103) is connected with an external power source; the other end of the first reference circuit (103) is grounded through the second reference circuit (104). The single-input double-output pulse width modulation signal producing circuit has the beneficial effect that the microcontroller only uses one PWM port to control two switch elements of a same bridge arm and produce dead-time, so that the PWM port of the microcontroller can be effectively saved.

Description

technical field [0001] The invention relates to the technical field of drive control of switching devices, and more specifically, to a single-input and double-output pulse width modulation signal generation circuit. Background technique [0002] In the fields of household appliances, industrial control, power supply, etc., it is often necessary to control multiple switching devices at the same time, so multiple PWM (Pulse Width Modulation, pulse width modulation) ports are required. When a single microcontroller is used for control, the PWM ports will not be enough. Usually, the method of increasing the number of microcontrollers is used to increase the number of PWM ports. This method not only needs to solve the communication problem between multiple microcontrollers, but also increases the complexity of the system control, but also increases the cost. [0003] In the prior art, the microcontroller usually outputs two complementary control signals to control the two switchi...

Images