Patent ID: 11934216
Assignee: HEFEI AICHUANGWEI ELECTRONIC TECHNOLOGY CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A constant current generation circuit for an optocoupler isolation amplifier, comprising a start circuit (1), a current generation circuit and a precision adjustment and output circuit (3) which are integrated into a same substrate, wherein the start circuit (1) can generate and output a first start current and a second start current;
the current generation circuit comprises a negative temperature change rate current generation circuit (21) and a positive temperature change rate current generation circuit (22), wherein the negative temperature change rate current generation circuit (21) is connected with a first start current output end; the positive temperature change rate current generation circuit (22) is connected with a second start current output end; and
the precision adjustment and output circuit (3) is used for outputting a constant current meeting application requirements of the optocoupler isolation amplifier by adjusting proportional precision of two currents outputted from the current generation circuit, wherein the start circuit (1) comprises a diode D1, a resistor R1 and a diode D2 which are connected with a power supply in sequence, wherein an anode of the diode D1 is connected with an output end of the power supply, and a cathode is connected with one end of the resistor R1; another end of the resistor R1 is connected with a cathode of the diode D2; and the first start current output end and the second start current output end are led out from an anode of the diode D2 via resistors R2 and R3, respectively.