Frequency conversion air conditioning inverter touch panel circuit analysis

IPM to work normally, besides the input dc 300 v power supply, each power unit must also be provided by the switch power supply circuit dc + 15 v working voltage and the trigger voltage. The principle of switch power supply, as shown in figure 8, IPM and switch power supply in a circuit board. In the switch tube components for IC11, for power triode. Switching power supply control for discrete component polyester packaging IC8, internal control for double circuit. Terminal 5, 6, as an independent of the secondary power supply circuit, voltage of + 12 v, the control voltage output. generator set spare parts The rest of the terminal for www.dongfeng-motor.com primary power supply circuit, oscillation and regulating role. 

Terminals for power supply side, and 300 v dc, terminal 1 for oscillation positive feedback input, performance value is + 12 v, terminal 2 for switch pulse output, performance value of + 6 v. Close analysis of the 3 phase induction motor circuit to refer to figure 7 can find some special points in the following: 1. The + 12 v power supply (cold) constitute a loop, and common used for sampling and main circuit power supply voltage control. 2. Eu and U power supply constitute a separate circuit, trigger control signal U. 3. The Ev and AC synchronous generator V power supply constitute a separate circuit, control signal V trigger. 4. Ew and U power supply constitute a separate circuit, control signal trigger w. 5. Power supply and dc re E N composition circuit, control signal trigger of x, y, z, because x, y, z three signal common dc re N.