CN-224233680-U - Accelerator pedal analog quantity output circuit with protection function

Abstract

The utility model provides an accelerator pedal analog quantity output circuit with protection, which comprises an operational amplifier U1, wherein a first input end of the operational amplifier U1 is connected to an analog quantity input end AIN1 through a resistor R2, one end of the resistor R1 is grounded, the other end of the resistor R1 is connected to a second input end of the operational amplifier U1, an output end of the operational amplifier U1 is connected to an analog quantity output end ADC1 sequentially through a diode D2 and a resistor R4 which are connected in series, the conducting direction of the diode D2 is the conducting direction from the diode D2 to the resistor R4, the conducting direction from the resistor R4 to the diode D2 is reversely cut off, and one end of the resistor R3 is connected to the second input end of the operational amplifier U1 and is connected with a positive electrode +VCC of a power supply, and the other end of the resistor R3 is connected to the analog quantity output end ADC1. The scheme has the characteristics of strong circuit universality, low cost and high reliability.

Inventors

• XU MINGHUI
• WANG SHENGQIAN

Assignees

• 浙江中力机械股份有限公司

Dates

Publication Date

20260512

Application Date

20250411

Claims (2)

1. 1. An accelerator pedal analog quantity area protection output circuit, characterized by comprising: the first input end of the operational amplifier U1 is connected to the analog input end AIN1 through a resistor R2; A resistor R1, one end of which is grounded, and the other end of which is connected to the second input end of the operational amplifier U1; The output end of the operational amplifier U1 is connected to the analog output end ADC1 through a diode D2 and a resistor R4 which are connected in series, the conducting direction of the diode D2 is the direction from the diode D2 to the resistor R4, and the direction from the resistor R4 to the diode D2 is reversely cut off; And one end of the resistor R3 is connected to the second input end of the operational amplifier U1 and is connected with the positive electrode +VCC of the power supply, and the other end of the resistor R3 is connected to the analog output end ADC1.
2. 2. The accelerator pedal analog quantity protected output circuit according to claim 1, further comprising a diode D1, wherein one end of the diode D1 is connected to the second input terminal of the operational amplifier U1, the other end of the diode D1 is connected to the positive electrode +vcc of the power supply, and the direction of conduction of the diode D1 is the direction from the resistor R3 to the diode D1, and the direction from the diode D1 to the resistor R3 is cut off.

Description

Accelerator pedal analog quantity output circuit with protection function Technical Field The utility model relates to the technical field of electric forklifts, in particular to an accelerator pedal analog quantity output circuit with protection. Background The analog quantity signal output by the general accelerator pedal is directly output by adopting a resistor or an internal Hall analog quantity signal, and the analog quantity output signal can damage the accelerator pedal after the analog quantity output signal is short-circuited to the negative electrode of the power supply or the positive electrode of the power supply. Disclosure of Invention In order to solve the problems, the utility model aims to provide an accelerator pedal analog quantity output circuit with protection, which is an analog quantity signal amplifying and protecting circuit composed of a resistor, a diode and an operational amplifier, and has the characteristics of strong circuit universality, low cost and high reliability. An accelerator pedal analog quantity protected output circuit, comprising: the first input end of the operational amplifier U1 is connected to the analog input end AIN1 through a resistor R2; A resistor R1, one end of which is grounded, and the other end of which is connected to the second input end of the operational amplifier U1; The output end of the operational amplifier U1 is connected to the analog output end ADC1 through a diode D2 and a resistor R4 which are connected in series, the conducting direction of the diode D2 is the direction from the diode D2 to the resistor R4, and the direction from the resistor R4 to the diode D2 is reversely cut off; And one end of the resistor R3 is connected to the second input end of the operational amplifier U1 and is connected with the positive electrode +VCC of the power supply, and the other end of the resistor R3 is connected to the analog output end ADC1. Preferably, the circuit further comprises a diode D1, one end of the diode D1 is connected to the second input end of the operational amplifier U1, the other end of the diode D1 is connected to the positive electrode +VCC of the power supply, the conducting direction of the diode D1 is the direction from the resistor R3 to the diode D1, and the direction from the diode D1 to the resistor R3 is cut off. In the above scheme, an AIN1 input signal is input to the input end of the operational amplifier U1 through the resistor R2, and the input end of the operational amplifier U1 outputs an ADC1 signal through an amplifying circuit composed of the resistor R1, the resistor R3, the resistor R4 and the diode D2. When the ADC1 signal is shorted to the power supply cathode, the current limitation through resistor R4 avoids excessive current damaging the operational amplifier U1 and the input signal AN1. When the ADC1 signal is short-circuited to the power supply positive electrode, the excessively high power supply positive electrode voltage flows through the diodes D1 to +VCC through the current limit of the resistor R3, the input end voltage of the operational amplifier is clamped by the diode D1 to avoid overvoltage of the operational amplifier, and meanwhile, the excessively high power supply positive electrode voltage is reversely cut off by the diode D2 to avoid current flowing into the output end of the operational amplifier. Thereby realizing protection of the operational amplifier U1 and the input signal AN1. Drawings Fig. 1 is a schematic structural view of the present application. Detailed Description Embodiments of the present utility model are described in detail below. As shown in FIG. 1, this embodiment provides an accelerator pedal analog protected output circuit comprising an operational amplifier U1, resistors R1, R2, R3, R4, diodes D1 and D2. The analog input end AIN1 is connected to the resistor R2, the resistor R2 is connected to the input end of the operational amplifier U1, the other input end of the operational amplifier U1 is connected with the resistor R1 and the resistor R3, the resistor R3 is connected to the resistor R4 to output to the ADC1, the other end of the resistor R4 is connected with the diode D2, and the diode D2 is connected to the output end of the operational amplifier U1. When the analog output end (ADC 1) is short-circuited to the negative electrode of the power supply, the resistor R4 connected in series to the output end greatly reduces short-circuit current through the current limiting function, and the operational amplifier U1 and the input signal end AIN1 are prevented from being burnt out due to overcurrent. When the ADC1 is short-circuited to the positive electrode of the power supply, the high voltage of the positive electrode of the power supply flows to the diode D1 through the resistor R3, and the voltage of the input end of the operational amplifier U1 is clamped in a safe range by the conduction voltage drop of the D1, so that the overvoltage damage of the input end