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Circuit and method for increasing current overload protecting ability of power supply

A technology of overload protection and power supply current, applied in the direction of measuring current/voltage, only measuring current, measuring electrical variables, etc., can solve problems such as increasing power consumption, reducing overall efficiency, and temperature changes affecting measurement accuracy, so as to improve efficiency , fast response, and convenient PCB layout

Inactive Publication Date: 2017-05-31
STATE GRID INTELLIGENCE TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) Increase power consumption and reduce overall efficiency, especially in circuits with relatively large output current;
[0005] 2) Changes in temperature affect the accuracy of measurement

Method used

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  • Circuit and method for increasing current overload protecting ability of power supply

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] 1. The load current of the power supply flows through the inductor, and also flows through the DCR in the inductor coil

[0024] VL(s)=IL(s*L+DCR)s=jw (1)

[0025] Among them, VL(s) is the voltage across the inductor, s=jw, I is the current value flowing through, L is the inductance value, and DCR is the DC internal resistance value of the inductor coil.

[0026] 2. An RC network is matched at both ends of the inductor, and the voltage can be divided on C:

[0027] Vc=VL / (R+1 / SC)*1 / SC (2)

[0028] 3. The RC time length matches the L / DCR time length:

[0029] That is, RC=L / DCR (3)

[0030] 4. Deduced from (1)(2)(3):

[0031] Vc(s)=(s*L / DCR+1)*(DCR*IL) / (sRC+1)

[0032] Deduce Vc(s)=DCR*IL

[0033] As long as the appropriate RC network (RC=L / DCR) is matched, it is convenient to calculate and quote the inductor current for circuit protection a...

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Abstract

The invention discloses a circuit and method for increasing the current overload protecting ability of a power supply. The circuit comprises a DCR current sampling circuit, an RC matching conversion circuit and an operational amplifier circuit. The circuit has the advantages that the current sampling circuit adopts simple and practical inductive current sampling, and transmission output currents or power can be presented in real time; the RC matching conversion circuit adopts a simple RC network, and easy wiring can be achieved without a large space during PCB layout; the optional amplifier circuit does not have a delay time difference and can transmits a real-time current signal at any time; all the circuits do not have the delay time difference, power supply overload protecting ability is increased, the lossless sampling circuit is provided, loss can be reduced, and efficiency can be increased; the circuit is low in PCB space occupation, and the PCB layout is facilitated; the DCR current detecting circuit uses an induction parasitic resistor to measure the load currents and is fast in response.

Description

technical field [0001] The invention relates to a circuit and a method for improving the power supply current overload protection capability. Background technique [0002] The switching power supply output needs an inductance. To detect the inductance current, the detection resistor is usually connected in series. The method is simple and easy to implement, but there is power consumption and lower efficiency. The temperature coefficient of the resistance will change with the increase of current and long-term work. The detected current value Deviations will affect the test results. [0003] In the conventional application of adopting the above scheme, there are following disadvantages: [0004] 1) Increase power consumption and reduce overall efficiency, especially in circuits with relatively large output current; [0005] 2) Changes in temperature affect the accuracy of the measurement. Contents of the invention [0006] In order to solve the above problems, the present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
CPCG01R19/0053G01R19/0092
Inventor 李志高刘爱忠吕昭家张磊魏晓飞马晓光王斌颜斌陈晓东葛成龙
Owner STATE GRID INTELLIGENCE TECH CO LTD