Linear direct-current power source

A technology of direct current power supply and direct current, applied in the direction of adjusting electrical variables, instruments, control/regulation systems, etc., to achieve the effects of easy implementation, simple structure, and guaranteed accuracy and stability

Pending Publication Date: 2017-02-22
江苏惠中电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Linear power supply (LDO) has the advantages of high power supply quality, small ripple, and small harmonic content, and can meet the requirements of the above-mentioned applications. However, most current linear power supply LDOs sacrifice load capacity and overall efficiency to obtain accurate How to improve the load capacity and output efficiency of the linear DC power supply on the premise of ensuring the voltage output accuracy is a problem that the industry needs to solve at present

Method used

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  • Linear direct-current power source

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Embodiment

[0024] Such as figure 1 As shown, this embodiment discloses a linear DC power supply, including a voltage regulator U with a model of LM723, a power supply management circuit, an output adjustment circuit, an overvoltage protection circuit, an overcurrent protection circuit, a frequency compensation circuit, and an adjustable reference Voltage circuit.

[0025] LM723 is a regulated power supply chip that can be purchased on the market at present. It has high-performance linear regulation and load regulation, and can ensure the stability of the output voltage after use.

[0026] The adjustable reference voltage circuit is connected to the non-inverting input pin of LM723 to provide an adjustable reference voltage to LM723. Specifically, the adjustable reference voltage circuit includes resistor R2, resistor R4 and adjustable resistor R3, resistor R2, adjustable resistor R3, The three resistors R4 are connected in series in turn, one end of the series is grounded, the other end of th...

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PUM

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Abstract

The invention provides a linear direct-current power source comprising a voltage regulator and a power supply management circuit. The power source is characterized by further comprising an output adjustment circuit, an over-current protection circuit and an over-voltage protection circuit, the power supply management circuit comprises a transformer, three taps are arranged at the output end of the transformer and include the tap A, the tap C and the tap B in the middle, the alternating current output by the tap A and the tap C outputs first direct current through full-wave rectification to supply power to the voltage regulator, and the alternating current output by the tap B outputs second direct current through half-wave rectification to supply power to the output adjustment circuit. The overall efficiency of the power source is improved through the middle tap of the transformer, the loading capacity of the power source is improved by additionally arranging a transistor, a high-performance control chip LM723 serves as the kernel, output precision and stability are ensured, and over-current protection and over-voltage protection are achieved; all the circuits are composed of hardware, and the power source is simple in structure, easy to obtain, very high in reliability and maintainability and particularly suitable for being used in application occasions where low-voltage large-current power sources are used.

Description

Technical field [0001] The invention belongs to the technical field of regulated power supplies, and specifically relates to a linear direct current power supply. Background technique [0002] In the analog circuit system, the power supply is one of the important factors affecting its performance, especially in high-voltage, high-frequency applications, such as high-precision digital and analog conversion, signal processing circuits, medical equipment, etc. . Linear power supply (LDO) has the advantages of high power supply quality, small ripple, and low harmonic content, which can meet the requirements of the above-mentioned applications. However, current linear power supply LDOs mostly sacrifice load capacity and overall efficiency to achieve precision How to improve the load capacity and output efficiency of the linear DC power supply while ensuring the accuracy of the voltage output is a problem that the industry needs to solve at present. Summary of the invention [0003] I...

Claims

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Application Information

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IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 周昌张艳新
Owner 江苏惠中电气有限公司
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