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High-precision signal source output overvoltage protection circuit

A technology of output overvoltage and protection circuit, which is applied in the direction of emergency protection circuit device for limiting overcurrent/overvoltage, emergency protection circuit device, and protection reacting to overcurrent, etc., which can solve the problem of low protection ability and affecting signal Source accuracy and other issues to achieve the effect of improving load capacity, improving output overvoltage protection capability, and saving costs

Active Publication Date: 2015-01-21
ZHEJIANG SUPCON INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-precision signal source output over-voltage protection circuit is used to automatically detect over-current, and quickly self-shutoff when over-current, and limit the voltage within the range that the device can withstand, so as to achieve high over-voltage protection capability without affecting the signal source. The output accuracy solves the technical problem that the protection ability of the conventional output overvoltage protection circuit is low and affects the accuracy of the signal source

Method used

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  • High-precision signal source output overvoltage protection circuit

Examples

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no. 1 example

[0045] The invention provides a high-precision signal source output overvoltage protection circuit, figure 2 It is a schematic diagram of the first structure of a high-precision signal source output overvoltage protection circuit of the present invention, please refer to figure 2 , including: an operational amplifier module 10, a first voltage clamping unit 20, a first overcurrent and overvoltage protection unit 30, and a feedback unit 40; the first voltage clamping unit 20 is used for voltage clamping; the first overcurrent and overvoltage The protection unit 30 is used for self-shutoff during overcurrent and overvoltage, so as to protect the internal circuit from damage; wherein:

[0046] The operational amplifier module 10 includes a non-inverting input terminal, an inverting input terminal and an output terminal, the first voltage clamping unit 20 includes a connection port, and the first overcurrent and overvoltage protection unit 30 includes a first terminal and a seco...

no. 2 example

[0070] As a further improvement of the present invention, an upgrade is made on the basis of the first high-precision signal source output overvoltage protection circuit, and overvoltage protection measures are also taken for the feedback unit. Figure 4 It is the second structural diagram of a high-precision signal source output overvoltage protection circuit of the present invention, please refer to Figure 4 . In order to clearly compare the differences between this embodiment and the above-mentioned embodiments, the same components as the first embodiment use the same reference numerals.

[0071] The feedback unit 40 includes a second overcurrent and overvoltage protection unit 41 and a second voltage clamping unit 42. The second overcurrent and overvoltage protection unit 41 is electrically connected to the inverting input terminal of the operational amplifier module 10 and the first optical control unit. Between the third terminals of the field effect transistor 300 , t...

no. 3 example

[0092] As a further improvement of the present invention, the first voltage clamping unit is improved on the basis of the first high-precision signal source output overvoltage protection circuit and the second high-precision signal source output overvoltage protection circuit. . Figure 6 It is a circuit topology diagram of the third embodiment of a high-precision signal source output overvoltage protection circuit of the present invention. The circuit structure diagram of this embodiment is the same as that of the second embodiment, please refer to it together Figure 4 and Figure 6 , in order to clearly compare the differences between this embodiment and the above-mentioned embodiments, the same components use the same symbols.

[0093]Compared with the first voltage clamping unit 20 of the first embodiment and the second embodiment, the first voltage clamping unit 20 in the third high-precision signal source output overvoltage protection circuit further includes a fifth d...

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Abstract

The invention provides a high-precision signal source output overvoltage protection circuit which is mainly applied to high-precision signal source equipment and a protection circuit requiring high-precision signal source output and high reliability. The high-precision signal source output overvoltage protection circuit comprises an operational amplifier module, a first voltage clamping unit, a first overcurrent and overvoltage protection unit and a feedback unit, wherein a normal-phase input end of the operational amplifier module is used for receiving the input voltage; a reversed-phase input end of the operational amplifier module is electrically connected with a second end of the first overcurrent and overvoltage protection unit through the feedback unit; an output end of the operational amplifier module is electrically connected with a first end of the first overcurrent and overvoltage protection unit; a connection port of the first voltage clamping unit is electrically connected with the output end of the operational amplifier module; the first overcurrent and overvoltage protection unit further comprises a first light-controlled field effect tube; and the first light-controlled field effect tube is a protection device with quick self cutoff of overcurrent detection.

Description

technical field [0001] The invention relates to an output overvoltage protection circuit, in particular to an output overvoltage protection circuit of a high-precision signal source. Background technique [0002] In the process of product use, human error often occurs, especially the output circuit misoperation will cause damage to the system. For example, if the output terminal is wrongly connected to high voltage (220V AC, etc.), or the output terminal is wrongly connected to the input terminal, or the signal source connected exceeds the measurement range of the system itself, etc., the protection ability of the output circuit is generally very weak and cannot be very strong. overvoltage protection capability. [0003] The conventional protection method adopts the method of adding an overcurrent and overvoltage protection device on the connection line between the input terminal of the circuit or the output terminal of the signal source, such as figure 1 As shown, the cir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/04H02H3/08
Inventor 李堂忠丁云王凯罗志君杨舟童灵赵滔
Owner ZHEJIANG SUPCON INSTR