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Positive and negative output voltage suppression circuit and method

A technology for outputting voltage and suppressing circuits, which is used in output power conversion devices, conversion of DC power input to DC power output, electrical components, etc. The effect of high sex and low calorific value

Inactive Publication Date: 2017-05-31
TIANSHUI 749 ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a positive and negative output voltage suppression circuit, which solves the shortcomings of traditional suppression of output voltage, such as large volume, large loss, high cost, complicated circuit, and inconvenient integration.

Method used

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  • Positive and negative output voltage suppression circuit and method
  • Positive and negative output voltage suppression circuit and method
  • Positive and negative output voltage suppression circuit and method

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Experimental program
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Embodiment 1

[0030] The positive terminal voltage reference source is composed of the first resistor R1, the first voltage reference IC1 and the first capacitor C1, and provides the reference voltage 2.5V to the inverting input pin 2 of the first comparator IC2. The positive terminal sampling feedback is composed of the fourth resistor R4 and the fifth resistor R5, and the positive terminal sampling feedback voltage is provided to the non-inverting input pin 3 of the first comparator IC2, and the output positive terminal voltage is set through the fourth resistor R4 and the fifth resistor R5. Fixed value + Vout,

[0031] When the positive power supply input voltage +Vin does not exceed the maximum working voltage +Vout of the positive terminal rear pole circuit, the sampling voltage of the positive terminal output voltage +Vout is less than the reference voltage 2.5V, the first comparator IC2 outputs a low level, and the gate-source voltage VGS VGS(th), and the PMOSE transistor T1 is turne...

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Abstract

The invention provides a positive and negative output voltage suppression circuit and a method. The positive and negative output voltage suppression circuit is formed by a positive-terminal voltage reference source, positive-terminal sampling feedback, a positive-terminal voltage comparison circuit, a PMOSFET tube, a negative-terminal voltage reference source, negative-terminal sampling feedback, a negative-terminal voltage comparison circuit, and a NMOSFET tube. The PMOSFET tube and the NMOSFET tube of the circuit are operated in the saturation region for a long time, the voltage drop between the drain electrode and the source electrode is very low, and the calorific value is very low. Only if the output voltage of a direct current supply system exceeds the maximum working voltage permitted by the next level of the circuit, the PMOSFET tube and the NMOSFET tube are operated in the cut-off region or the linear region, the voltage drop is existent between the drain electrode and the source electrode, and the voltage drop is changed into the heat energy for consuming. The positive and negative output voltage suppression circuit has the characteristics of flexible application, simple principle, low breakover internal resistance, small voltage drop, small calorific value, easy implementing, high product reliability, compact structure, and small volume.

Description

technical field [0001] The invention belongs to the field of electronic equipment protection circuits, relates to a direct current voltage based on a PMOSFET tube and an NMOSFET tube, and specifically relates to a positive and negative output voltage suppression circuit and method. Background technique [0002] The output voltage range of the positive and negative power supply applied to the front end exceeds the maximum working voltage of the subsequent stage circuit. It is necessary to suppress the output voltage of the positive and negative power supply within the set value range and not exceed the positive and negative maximum value of the working voltage of the subsequent stage circuit. Ensure the stable and reliable operation of the post-stage circuit. [0003] At present, there are two main application schemes; figure 1 As shown, the first method uses a series iron core inductor and bypass capacitors, supplemented by a high power transient voltage suppressor (TVS). ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02M1/32
CPCH02M1/32H02M3/158
Inventor 马川喜
Owner TIANSHUI 749 ELECTRONICS