Output isolation constant-current source circuit with PWM (pulse width regulation) regulation and control functions

An output isolation, constant current source technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of high cost, integration of isolation and PWM control, etc., to achieve low price, temperature characteristics and constant current. Good effect and high precision effect

Active Publication Date: 2018-11-06
赵明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In many current circuit systems, constant current sources are used, but the existing constant current sour...

Method used

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  • Output isolation constant-current source circuit with PWM (pulse width regulation) regulation and control functions
  • Output isolation constant-current source circuit with PWM (pulse width regulation) regulation and control functions

Examples

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Embodiment Construction

[0017] Regarding the detailed content and technical description of the present invention, examples are used for further description, but it should be understood that these examples are only for illustration, and should not be construed as limitations on the implementation of the present invention.

[0018] refer to figure 1 The schematic diagram of a constant current source circuit with output isolation and PWM regulation is shown, including optocoupler U1, three-terminal shunt regulator U2, resistors R1-R3, N-JFET tubes Q1-Q3, N-MOSFET tube Q4, Inductance L1-L2, capacitance C1-C3;

[0019] Pin 1 and pin 4 of the optocoupler U1 are connected to the positive terminal of the external PWM differential control signal through the resistor R1, pin 2 of the optocoupler U1 is connected to pin 3 and then connected to the negative terminal of the external PWM differential control signal, 5 The pin is connected to the anode of the three-terminal shunt regulator U2 and the control pole o...

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Abstract

The invention relates to an output isolation constant-current source circuit with PWM (pulse width regulation) regulation and control functions, and belongs to the field of designs. The output isolation constant-current source circuit comprises an isolation control circuit, a constant-current source circuit and a filter circuit. The output isolation constant-current source circuit has the advantages that pulse currents can be generated under the control of PWM signals, constant currents which are in linear relations with the pulse widths of the PWM signals can be generated after the pulse currents are filtered, the output isolation constant-current source circuit is simple in structure and low in cost, and miniaturization and lightweight production can be facilitated.

Description

technical field [0001] The invention relates to a constant current source circuit, which belongs to the field of constant current source design. Background technique [0002] In many current circuit systems, constant current sources are used, but the existing constant current source technology rarely integrates isolation and PWM control, even if they are integrated, the cost is relatively high. Contents of the invention [0003] Aiming at the above problems in the prior art, the present invention proposes a PWM-adjustable constant current source circuit that can realize output isolation using common low-priced components, effectively reducing the material cost of the constant current source; [0004] In order to achieve the above object, the present invention adopts such as figure 1 The technical scheme shown is described as follows: [0005] An output isolated PWM adjustable constant current source circuit, comprising: [0006] Isolated control circuit, constant curren...

Claims

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Application Information

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IPC IPC(8): G05F1/56
CPCG05F1/561Y02B70/10
Inventor 赵明
Owner 赵明
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