High-efficiency constant current source circuit capable of multi-channel current sharing

A technology of constant current source and high efficiency, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of large voltage drop of MOS tubes and low efficiency of constant current source, and achieve high efficiency, low cost, and high efficiency effect

Pending Publication Date: 2019-07-05
SUZHOU VOCATIONAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the power MOS tube of this kind of constant current source usually does not work in the adjustable resistance area. The voltage drop of the MOS tube is large, the efficiency of the constant current source is not high, and there is only one output. Can't do anything on output

Method used

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  • High-efficiency constant current source circuit capable of multi-channel current sharing
  • High-efficiency constant current source circuit capable of multi-channel current sharing
  • High-efficiency constant current source circuit capable of multi-channel current sharing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In this embodiment, the first power tube Q1 and the second power tube Q2 are MOS tubes, the first power tube Q1 is IRF730, the second power tube Q2 is IRF3205, the third power tube Q3 and the fourth power tube Q4 are both 2SD882 ; The current detection resistor RS1 selects a resistor with a resistance value of 1Ω or 0.5Ω, and the current detection resistor RS2 selects a resistor with a resistance value of 0.1Ω.

[0042] In this embodiment, when UC3845 works stably, the voltage on pin 2 is 2.5V, and the output voltage of the single-ended flyback circuit supplies power to LM358, so the output voltage cannot exceed the allowable voltage of 30V of LM358, and the adjustable resistor RP2 is connected to the circuit. Part of the resistance value is RP2', then the resistance distribution ratio of resistors R5, R6 and adjustable resistor RP2 is:

[0043]

[0044] In the part of the voltage-controlled constant current source circuit, the second power transistor Q2 works in an ...

Embodiment 2

[0056] In this embodiment, the load circuit has only one load, and the load is directly connected across the single-ended flyback output terminal (the positive pole of the electrolytic capacitor C2 ) and the drain of Q2 .

Embodiment 3

[0058] In this embodiment, the load circuit such as image 3 Shown is a mirror current source circuit with n branches. At this time, the third power transistor Q3 in the mirror current source circuit provides the base current, and the branch LOAD1 where the third power transistor Q3 is located must be connected to the load. load.

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Abstract

The invention discloses a high-efficiency constant current source circuit capable of multi-channel current sharing. The circuit comprises a single-ended flyback circuit, a voltage-controlled constantcurrent source circuit, a voltage sampling circuit and a mirror current source circuit, wherein the single-ended flyback circuit powers the voltage-controlled constant current source circuit; the voltage sampling consists of two parts, both of which are fed back to a single-ended flyback control section, one part samples the output voltage of the single-ended flyback circuit to limit its maximum output voltage, and the other part samples the voltage on the constant current source power tube by integrated operational amplification to minimize the voltage drop across its power tube, thereby greatly improving working efficiency of the system. When the constant current source circuit load requires multi-branch current sharing, the mirror power supply circuit is introduced, and the currents ofthe respective branches are equal under the premise of equalized total current.

Description

technical field [0001] The invention relates to a constant current source circuit, in particular to a high-efficiency constant current source circuit capable of multi-channel current sharing. Background technique [0002] Constant current sources have been widely used in many fields, including light intensity standard lamps, electronic vacuum tubes, semiconductor device parameter measurement, various physical property sensitive devices, LED lighting, etc. Among many types of constant current source circuits, the voltage-controlled constant current source composed of operational amplifiers and power MOS tubes is the most common constant current source. However, the power MOS tube of this kind of constant current source usually does not work in the adjustable resistance area. The voltage drop of the MOS tube is large, the efficiency of the constant current source is not high, and there is only one output. Can't do anything on output. Contents of the invention [0003] The ...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G05F3/26
CPCG05F3/262
Inventor张波汪义旺宋佳齐美星周畅
OwnerSUZHOU VOCATIONAL UNIV