Voltage following type depth negative feedback constant current source device

A deep negative feedback, voltage following technology, applied in the direction of adjusting electrical variables, converting irreversible DC power input to AC power output, instruments, etc. Low consumption, good constant current effect

Inactive Publication Date: 2014-04-02
SHANDONG LANFU HIGH ENERGY PHYSICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The constant current source of the switching power supply mode has high efficiency and small

Method used

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  • Voltage following type depth negative feedback constant current source device

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[0011] In order to clearly illustrate the technical characteristics of this solution, the following describes this solution through a specific implementation and in conjunction with the accompanying drawings.

[0012] The voltage-following deep negative feedback constant current source device of the present invention includes an input rectification filter unit, a DC-AC inverter unit, an output rectification filter unit, a linear constant current regulator, a load, and an input rectification filter unit connected with AC The power supply and the load are respectively connected with a voltage sampling unit and a current sampling unit. The voltage sampling unit is connected with a PWM voltage control unit connected to the DC-AC inverter unit, and the current sampling unit is connected with a constant current connected to a linear constant current regulator. control unit.

[0013] The constant current control unit is also connected with a constant current adjustment and adjustable refe...

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Abstract

The invention discloses a voltage-following type depth negative feedback constant current source device which comprises an input rectification filtering unit, a DC-AC inversion unit, an output rectification filtering unit, a linear constant current adjusting tube and a load which are connected in sequence, wherein the input rectification filtering unit is connected with an alternative current power supply; the load is respectively connected with a voltage sampling unit and a current sampling unit; the voltage sampling unit is connected with a PWM voltage control unit connected with the DC-AC inversion unit; the current sampling unit is connected with a constant current control unit connected with the linear constant current adjusting tube. On the basis of the conventional constant current source circuit, the PWM power supply control unit is added, so that the voltage of a control power supply changes along with the change of the load, and the voltage drop on the linear constant current adjusting tube is constantly kept at a constant value, therefore, the device has the advantages of good constant current effect, high precision and rapid response of the constant current source circuit, and but also has the advantages of high circuit efficiency of a switch power supply, small power consumption, low temperature rise and high reliability.

Description

technical field [0001] The invention relates to a constant current source device, in particular to a voltage-following deep negative feedback constant current source device. Background technique [0002] The constant current source device is a power supply device that can provide a constant current to the load, and it can keep the output current constant when the external grid power supply fluctuates and the impedance characteristics change. The constant current source circuit has the characteristics of constant output current, good temperature stability, and fast response. [0003] The constant current source device is one of the most widely used circuit units in electronic circuits and analog integrated circuits. Constant current source devices have important uses in the field of measurement and engineering technology: calibration of multimeters, ammeters and other instruments, precision resistance measurement, parameter measurement of semiconductor devices, electronic lo...

Claims

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Application Information

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IPC IPC(8): H02M7/48G05F1/46
Inventor 沈松黄忠义王文兵位同厦吕荣伟
Owner SHANDONG LANFU HIGH ENERGY PHYSICS TECH CO LTD
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