阅读说明：本技术 一种电流信号防抖动电路 (Current signal anti-jitter circuit ) 是由 克金超 阮朋举 李威 段艳旭 刘生卿 侯振亚 姜传喜 于 2021-04-13 设计创作，主要内容包括：本发明公开了一种电流信号防抖动电路,电路输入端接入外部毫安信号,电路输入端串联第一电阻后连接模拟开关控制信号输入端,模拟开关控制信号输出端串联模拟开关常开开关后连接运算放大器同相输入端,模拟开关控制信号输出端串联第二电阻后接地,运算放大器同相输入端通过电容接地,运算放大器反向输入端连接运算放大器输出端,运算放大器输出端串联第三电阻后接入控制系统；本发明能够预防因电流输入信号中断引起的控制系统电流抖动,保障控制系统安全稳定。(The invention discloses a current signal anti-jitter circuit, wherein an input end of the circuit is connected with an external milliampere signal, the input end of the circuit is connected with an analog switch control signal input end after being connected with a first resistor in series, an analog switch control signal output end is connected with an analog switch normally-open switch in series and then is connected with an operational amplifier non-inverting input end, an analog switch control signal output end is connected with a second resistor in series and then is grounded, the operational amplifier non-inverting input end is grounded through a capacitor, an operational amplifier inverting input end is connected with an operational amplifier output end, and the operational amplifier output end is connected with a control system after being connected with a third resistor in series; the invention can prevent the current jitter of the control system caused by the interruption of the current input signal and ensure the safety and stability of the control system.)

1. A current signal anti-jitter circuit, comprising: the circuit comprises a first resistor, a second resistor, a third resistor, an analog switch, an operational amplifier and a capacitor; the input end of the circuit is connected with an external milliamp signal, the input end of the circuit is connected with the input end of an analog switch control signal after being connected with a first resistor in series, the output end of the analog switch control signal is connected with the in-phase input end of an operational amplifier after being connected with an analog switch normally open switch in series, the output end of the analog switch control signal is connected with a second resistor in series and then is grounded, the in-phase input end of the operational amplifier is grounded through a capacitor, the reverse input end of the operational amplifier is connected with the output end of the operational amplifier, and the output end of the operational amplifier is connected with a third resistor in series and then is connected with a control system.

2. The current signal anti-jitter circuit of claim 1 wherein: the analog switch adopts a relay.

3. The current signal anti-jitter circuit of claim 1 wherein: the analog switch adopts a controllable silicon.

Technical Field

The invention belongs to the technical field of anti-jitter circuits, and particularly relates to a current signal anti-jitter circuit.

Background

In low-output power circuits such as a control system and the like, sudden loss of a current signal can cause input interruption, so that the low-output power circuit cannot normally output a milliampere signal, current jitter of the control system is caused, a fault of the control system is further caused, and the safe operation of the whole production system is influenced. Therefore, it is desirable to design a current signal anti-jitter circuit for low output power circuits to prevent the control system from being affected by the interruption of the current signal.

Disclosure of Invention

The invention aims to provide a current signal anti-jitter circuit which can prevent current jitter of a control system caused by interruption of a current input signal and ensure the safety and stability of the control system.

The technical scheme adopted by the invention is as follows:

a current signal anti-jitter circuit comprises a first resistor, a second resistor, a third resistor, an analog switch, an operational amplifier and a capacitor; the input end of the circuit is connected with an external milliamp signal, the input end of the circuit is connected with the input end of an analog switch control signal after being connected with a first resistor in series, the output end of the analog switch control signal is connected with the in-phase input end of an operational amplifier after being connected with an analog switch normally open switch in series, the output end of the analog switch control signal is connected with a second resistor in series and then is grounded, the in-phase input end of the operational amplifier is grounded through a capacitor, the reverse input end of the operational amplifier is connected with the output end of the operational amplifier, and the output end of the operational amplifier is connected with a third resistor in series and then is connected with a control system.

Further, the analog switch adopts a relay.

Further, the analog switch adopts a silicon controlled rectifier.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

by using the analog switch and the capacitor, a current signal can be input into the operational amplifier when an input signal is normal, and the input signal is automatically switched to the state that the voltage is provided for the operational amplifier through the capacitor when the input signal is interrupted, so that the current signal jitter of the control system caused by the interruption of the output current signal of the operational amplifier is prevented, the safe and stable operation of the control system is ensured, and the safe operation of the whole production system is further ensured.

Drawings

Fig. 1 is an electrical schematic of the present invention.

Detailed Description

A current signal anti-jitter circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, an analog switch, an operational amplifier and a capacitor C; the input end of the circuit is connected with a milliampere signal provided by an external circuit, the input end of the circuit is connected with the control signal input end of an analog switch after being connected with a first resistor R1 in series, the control signal output end of the analog switch is connected with the non-inverting input end of an operational amplifier after being connected with an analog switch normally-open switch S1 in series, the control signal output end of the analog switch is connected with a second resistor R2 in series and then is grounded, the non-inverting input end of the operational amplifier is grounded through a capacitor C, the inverting input end of the operational amplifier is connected with the output end of the operational amplifier, and the output end of the operational amplifier is connected with a control system after being connected with a third resistor R3 in series. The analog switch adopts a relay or a silicon controlled rectifier.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments.

As shown in fig. 1, the current signal anti-jitter circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a relay, an operational amplifier, and a capacitor C3. The capacitance of the electric meter resistor R1 is 100 omega, the capacitance of the second resistor R2 is 250 omega, the capacitance of the third resistor R3 is 250 omega, and the capacitance of the capacitor C3 is 5 muF.

The input end of the circuit is connected with an external milliamp signal, the input end of the circuit is connected with a relay coil T power-in end after being connected with a first resistor R1 in series, the output end of the relay coil T power-out end is connected with a resistor R2 in series and then grounded, the output end of the relay coil T power-out end is connected with a normally open relay S1 in series and then connected with the non-inverting input end of an operational amplifier, the non-inverting input end of the operational amplifier is connected with a capacitor C3 in series and then grounded, the inverting input end of the operational amplifier is connected with the output end of the operational amplifier, and the output end of the operational amplifier is connected with a third resistor R3 in series and then connected with a control system.

The working principle of the invention is as follows:

the milliampere input signal supplies power to the relay coil T through the first resistor R1, the normally open switch S1 of the relay is closed, the milliampere input signal is input into the capacitor C3 to charge the capacitor C3, after the capacitor C3 is fully charged, the voltage of the non-inverting terminal of the operational amplifier is increased, and the output end of the operational amplifier outputs high level and outputs the high level to the control system through the third resistor R3.

When the milliampere input signal is suddenly interrupted and lost, the relay coil T is powered off, the normally open switch of the relay is disconnected, and an external current signal cannot be normally input into the operational amplifier; at this time, the fully charged capacitor C3 provides voltage for the non-inverting terminal of the operational amplifier, so as to keep the output of the operational amplifier normal, and prevent the loss of milliamp signal through the third resistor R3, thereby ensuring the safety of the control system. After the milliampere signal is recovered to be normal, the current signal passing through the coil T of the relay is also recovered to be normal, and the relay is in a conducting state, so that the effect of preventing milliampere signal output interruption is achieved, and current jitter and control system faults caused by milliampere input signal interruption are effectively prevented.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included therein.