一种低压电流控制电路

Low-voltage current control circuit

Abstract

本发明公开了一种低压电流控制电路,包括斜坡补偿电路、PMOS管Q1~Q3、NMOS管Q4~Q7、电阻R1和R2以及恒流源;Q1的漏极接Q4的栅极和恒流源的一端,源极接Q4的漏极、Q2和Q3的源极、电压源VCC,栅极接Q2和Q3的栅极、Q2的漏极和Q5的漏极;R1和R2串联后一端接地,另一端接Q5的源极;Q4的源极接R1和R2的公共端;Q6的漏极接Q3的漏极、Q6的栅极和Q7的栅极,源极接地;恒流源的另一端接地;Q7的另一端接地;斜坡补偿电路的第一斜坡补偿电流I1接Q5的源极,第二斜坡补偿电流I3接NMOS管Q5的源极。有益效果:电路结构简单,电流输出精度高,电流输出范围广,输出电流稳定。
The invention discloses a low-voltage current control circuit which comprises the components of a slope compensating circuit, positive channel metal oxide semiconductors (PMOSs) Q1-Q3, negative channel metal oxide semiconductors (NMOSs) Q4-Q7, resistors R1 and R2, and a constant current source. The drain electrode of the Q1 is connected with the gate electrode of the Q4 and one end of the constant current source; the source electrode of the Q1 is connected with the drain electrode of the Q4, the source electrode of the Q2, the source electrode of the Q3 and a voltage source VCC; and the gate electrode of the Q1 is connected with the gate electrode of the Q2, the gate electrode of the Q3, the drain electrode of the Q2 and the drain electrode of the Q5. After R1 is connected with R2 in series, one end of an assembly obtained after connection is grounded, and the other end of the assembly is connected with the source electrode of the Q5. The source electrode of the Q4 is connected with the common end of the R1 and the R2. The drain electrode of the Q6 is connected with the drain electrode of the Q3, the gate electrode of the Q6 and the gate electrode of the Q7, and the source electrode of the Q6 is grounded. The other end of the constant current source is grounded. The other end of the Q7 is grounded. The first slope compensating current I1 of the slope compensating circuit is input into the source electrode of the Q5, and the second slope compensating current I3 of the slope compensating circuit is input into the source electrode of the NMOS Q5. The low-voltage current control circuit has beneficial effects of simple circuit structure, high current output precision, wide current output range and high output current stability.

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