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Protecting device for protecting a circuit against overvoltage and power supply member comprising such a device

An overvoltage and circuit technology, applied in emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection devices for automatic disconnection, circuit devices, etc., can solve the damage of power Zener diode, voltage increase, etc. problems, to achieve the effect of preventing circuit overvoltage and avoiding damage

Inactive Publication Date: 2015-07-22
MERSEN FRANCE SB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in such a device, when the voltage between the terminals of the varistor significantly increases due to overvoltage, the voltage between the terminals of the power Zener diode also greatly increases, which results in a breakdown of the power Zener diode damage

Method used

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  • Protecting device for protecting a circuit against overvoltage and power supply member comprising such a device
  • Protecting device for protecting a circuit against overvoltage and power supply member comprising such a device
  • Protecting device for protecting a circuit against overvoltage and power supply member comprising such a device

Examples

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specific Embodiment approach

[0025] exist figure 1 In this example, an electrical system 10 includes a power source 12 and a circuit 14 to be protected against overvoltage.

[0026] The power circuit 12 includes a power source 16 and a protection device 17 .

[0027] The power supply 16 is a voltage source. The power supply 16 is adapted to provide a voltage V1 that can be applied between the terminals of the circuit 14 without damaging the circuit. The voltage V1 is generally between 24 volts (V) and 1500V, preferably between 24V and 1000V.

[0028] The protection device 17 includes a non-linear resistor 18 , a current limiter assembly 20 and a Zener diode 22 . The Zener diode generally corresponds to a power Zener diode, the rated power of which is, for example, greater than 10W.

[0029] The varistor 18 is connected between terminals of the power supply 16 , that is, connected in parallel with the power supply 16 . The non-linear resistor 18 is preferably a varistor.

[0030] The non-linear resi...

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Abstract

The device for protecting a circuit includes a nonlinear resistance and a Zener diode. The nonlinear resistance is designed to be connected to the terminals of a power supply source of the circuit. The Zener diode and the nonlinear resistance each includes a first connecting end and a second connecting end. The first end of the Zener diode is connected to the second end of the nonlinear resistance. The device further includes a current limiter component, able to limit the intensity of the current passing through it. The current limiter component is connected between the second end of the nonlinear resistance and the second end of the Zener diode.

Description

technical field [0001] The invention relates to a device for preventing overvoltage of a circuit, ie a device designed to limit the voltage applied between the terminals of the circuit, and a power supply unit comprising such a device. Background technique [0002] One topic in the field of circuits is the protection of circuits from overvoltages in order to ensure proper operation of circuits and the components that make up those circuits. In fact, an overvoltage applied between two terminals of a circuit can cause the circuit to be damaged. Overvoltages typically result from electrostatic discharges that may be applied between the terminals of the circuit. [0003] In the field of protection against overvoltages it is known to use components such as varistors or Zener diodes. Zener diodes correspond more particularly to power Zener diodes, the rated power of which is, for example, greater than 10W. [0004] For example, when a varistor is connected in parallel with a ci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04
CPCH02H3/087H02H9/025H02H9/041B60L3/0023H02P3/22H02P29/028H02H9/042H02P29/021
Inventor 多米尼克·图尼耶詹佛朗哥·德·帕尔马
Owner MERSEN FRANCE SB