Application No./Patent No.: 201710450770X Application date: June 15, 2017.
Inventor/Designer: Peng Zhihui, Li Kai, Zhou Chen, Pan Xiaoming and Liu Wenwen.
The invention provides a flow equalization circuit of a water supply system based on PWM filtering, which comprises a frequency conversion constant pressure flow equalization control unit, a delta q (t) generation unit and an inverter unit, can realize self-service output flow equalization control of a pump set without a communication bus, and has the advantages of simple structure, stability and reliability; The analog signal difference is converted into digital PWM signal conduction time difference, which has strong anti-interference ability. 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 simple and low in cost. The parallel variable frequency water supply control system has the characteristics of simple structure, low cost, high reliability and strong practicability, which provides a new scheme for parallel variable frequency control of pumps.
