D/A signal superposition feedback circuit
A technology of signal superposition and feedback circuit, which is applied in the direction of electric light sources, electrical components, and adjustment of electrical variables, etc., can solve problems such as the inability to ensure reliable and stable operation of single-chip microcomputers, characteristic jumps in the steady-state stage of lamp tubes, and bad electronic ballasts, etc.
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[0025] see image 3 The voltage sampling circuit 1 includes a voltage transformer, and its secondary is connected to a full-bridge rectifier. The full-bridge rectifier is composed of diodes D6-D9. The operational amplifier U1C and resistors R4-R6 form an amplifier circuit to obtain a DC voltage signal and send it to the microcontroller. AD1 port. The current sampling circuit 4 includes a current transformer, and its secondary is connected to a full-bridge rectifier. The full-bridge rectifier is composed of diodes D1-D4, an operational amplifier U1A and resistors R1-R3 to form an amplifier circuit, and the obtained DC current signal is sent to the AD2 port of the single-chip microcomputer. , while also entering the superposition follower circuit A6. The superposition follower circuit A6 is composed of the operational amplifier U1B and the diode D5, the output terminal of the operational amplifier U1B is connected to the anode of the diode D5, and the cathode of the diode D5 is...
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