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Overvoltage absorption protection circuit

A technology for protecting circuits and circuits, applied in the field of signal detection, can solve problems such as MCU damage, device damage, and high cost of integrated circuit chips, and achieve the effect of simple circuit structure, low cost, and good stability

Active Publication Date: 2014-07-09
BEIJING AEONMED
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  • Abstract
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AI Technical Summary

Problems solved by technology

At the same time, in order to avoid damage to the MCU caused by excessive voltage on the MCU pin due to wrong soldering or short circuit, a diode will be pulled up on the MCU power supply terminal on the I / 0 port to prevent overvoltage problems, but this design scheme has defects, because The LDO output is not an ideal voltage source, and it does not have the ability to absorb overvoltage. When the sampling signal exceeds the LDO voltage by a large amount, it is easy to cause damage to the device.
In addition, the cost of integrated circuit chips is relatively high

Method used

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with drawings and embodiments.

[0035] figure 1 It is a structural schematic diagram of the overvoltage absorbing protection circuit of the present invention. Such as figure 1 Said, the circuit includes a reference voltage unit and a clamp absorption protection circuit unit, and the clamp absorption protection circuit unit includes a clamp protection circuit and a current sampling circuit;

[0036] The reference voltage unit is used to provide a reference voltage for the clamp absorption protection circuit unit;

[0037] The clamp protection circuit includes a first proportional operational amplifier circuit, the current sampling unit includes a triode feedback loop circuit, the reference voltage signal is amplified by the first proportional operational amplifier circuit, and the clamp voltage threshold is set. When the input signal source voltage is higher than the clamp voltage threshold, the inp...

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Abstract

The invention discloses an overvoltage absorption protection circuit. A clamping threshold and an overvoltage protection current alarm value are set through a pure analog circuit, and clamping protection and overvoltage absorption are performed on an MCU port when an overvoltage is input, and alarm is performed when the value of an absorption current which undergoes amplification processing reaches a current alarm value. At the same time, the circuit approaches a zero power consumption state under a condition that overvoltage does not exist. The overvoltage absorption protection circuit has the advantages of being simple in structure, great in stability and low in cost.

Description

technical field [0001] The invention relates to the field of signal detection, in particular to an overvoltage absorbing protection circuit. Background technique [0002] With the development of large-scale integrated circuits, the degree of device integration is increasing day by day, and it is gradually developing in the direction of miniaturization and low power consumption. The operating voltage of integrated circuit chips (such as MCU, etc.) is getting lower and lower, from the widely used 5V to 3.3V, 2.5V, 1.8V and even 0.9V. At the same time, the corresponding low dropout linear regulator (LDO) also come out accordingly. Signal acquisition is often involved in circuit design, and the control of signal voltage amplitude entering integrated circuit chips (such as MCU, etc.) is also more and more demanding. Due to differences in circuit design, the collected signal voltage amplitude is relatively high. In order to meet the requirements of the MCU's operating voltage, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04
Inventor 聂培军
Owner BEIJING AEONMED
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