Application No./Patent No.: 2017104507729 Application date: June 15, 2017.
Inventor/Designer: Peng Zhihui, Li Kai, Zhou Chen, Pan Xiaoming and Liu Wenwen.
The invention provides a water supply system flow equalization circuit for capturing PWM time, which comprises a variable frequency constant pressure flow equalization control unit, a flow deviation signal delta PWM generation unit and an inverter unit. Autonomous average output flow control of pump unit can be realized without communication president, which is simple in structure, stable and reliable; According to the invention, the analog signal difference is converted into the digital PWM signal conduction time difference, so that the invention has strong anti-interference capability; A circuit for calculating the difference between the on-time of PWMq(t) and PWMmax can be formed by diode D and XOR gate circuit, which is simple in structure, stable and reliable, and low in cost. The δ ΔPWM obtained has the falling edge at the same time, which can be used as the synchronization reference of flow sharing control and improves the flow sharing performance of the system.
