CN103516346B - A kind of triplex redundance analogue signal hardware voting circuit - Google Patents

Abstract

The invention belongs to the technical field of fly-by-wire flight control systems, in particular to a three-redundancy analog signal hardware voting circuit. A three-redundancy analog signal hardware voting circuit mainly includes a four-operation amplifier chip with high gain and several resistors. The circuit of the present invention is simple and practical, with low production cost, reliable circuit, no lag in signal selection and voting, convenient design and debugging, and can relatively easily solve the comprehensive problem of the three-redundancy drive signal of the control system, and realize the cross-redundancy voting from the controller to the execution part , can simplify the controller design, thereby improving the reliability of the whole system.

Description

A three-redundancy analog signal hardware voting circuit

technical field

The invention belongs to the technical field of fly-by-wire flight control systems, in particular to a three-redundancy analog signal hardware voting circuit.

Background technique

The fly-by-wire flight control system adopts redundancy technology to improve its own reliability, and the redundancy synthesis technology of the fly-by-wire system is also varied. At present, the redundancy signal synthesis technology commonly used in the fly-by-wire flight control system mainly consists of the following types:

Method 1: Use the controller to collect analog redundancy signals, vote on the signals through software algorithms and output the voting value; Method 2: Use online monitoring technology to monitor redundant components (such as controllers) online, when faults are found, pass additional Hardware, generally the relay circuit cuts off the output of the faulty channel and converts it to the normal channel output; Method 3: Control the output of the two-degree actuator through dual channels, and the mechanical travel of the actuator output is integrated mechanically. When a channel electrical system When there is a fault, the control performance is degraded; method 4: the control signals of multiple controllers are realized in the actuator through the integration of magnetic flux, the common ones are three-redundant and four-redundant magnetic flux integration, and most signals are normal In the case of , this method can realize the control of the actuator; method 5: authority distribution, different controllers control the actuators of different rudder surfaces, when a channel fails, only the control of the corresponding rudder surface is lost.

The above methods have the following advantages and disadvantages: the first method is widely used and the voting algorithm can be changed flexibly, but the circuit complexity is high, the design cost is high, the cycle is long, and the working environment is demanding; the second method is simple to implement, but a large number of relays are required circuit and needs the support of software and hardware monitoring components, which restricts the improvement of the reliability of voting switching; method three is generally used in double-double redundancy systems, but requires the comprehensive technology of mechanical signals as support; method four is generally based on specially customized actuators. The basis is the DDA actuator, which has high application restrictions; the fifth method shows that the redundancy degrades quickly, the system reliability is low, and the system redundancy bottleneck is large.

Contents of the invention

The technical problem to be solved by the present invention is: to propose a pure hardware circuit for three-redundancy analog signal voting with short design period, low design cost and high reliability, so as to solve the synthesis of three-redundancy signal output in the redundancy system question.

The technical solution of the present invention is: a three-redundancy analog signal hardware voting circuit, which mainly includes a four-operation amplifier chip with high gain and several resistors; the three-redundancy input signals are S1, S2, S3 respectively, and the input signals S1, S2 and S3 are respectively connected to input 1 of operational amplifiers U1, U2 and U3, and output 3 of operational amplifiers U1, U2 and U3 are respectively connected to input 1 of resistors R1, R2 and R3, and input 2 of resistors R1, R2 and R3 After connection, it is connected to the input terminal 1 of the operational amplifier U4 and the input terminal 1 of the resistor R5. The input terminal 2 of the resistor R5 is connected to the output terminal 3 of the operational amplifier U4, and at the same time connected to the input terminal 2 of the operational amplifier U1, U2, and U3. The resistor R4 Input 1 is connected to input 2 of operational amplifier U4, input 2 of resistor R4 is grounded, and output 3 of operational amplifier U4 is used as the final output signal.

The beneficial effects of the present invention are: the circuit of the present invention is simple and practical, the production cost is low, the circuit is reliable, the signal selection vote has no hysteresis, the design and debugging are convenient, and it is relatively easy to solve the comprehensive problem of the three-redundancy drive signal of the control system, realizing the controller to The cross-redundancy voting of the execution components can simplify the controller design, thereby improving the reliability of the whole system.

Description of drawings

Fig. 1 is a schematic diagram of a three-redundancy analog signal hardware voting circuit of the present invention.

detailed description

The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

A three-redundancy analog signal hardware voting circuit, mainly including a four-operational amplifier chip with high gain and several resistors; the three-redundancy input signals are respectively S1, S2, and S3, and the input signals S1, S2, and S3 are respectively connected to the operational amplifier Input 1 terminals of U1, U2, U3, output 3 terminals of operational amplifiers U1, U2, U3 are respectively connected to input 1 terminals of resistors R1, R2, R3, and input 2 terminals of resistors R1, R2, R3 are connected to operational amplifier U4 Input 1 is connected to the input 1 of the resistor R5, the input 2 of the resistor R5 is connected to the output 3 of the operational amplifier U4, and connected to the input 2 of the operational amplifiers U1, U2, and U3, and the input 1 of the resistor R4 is connected to the operational amplifier U4 The input terminal 2 of the resistor R4 is grounded, and the output terminal 3 of the operational amplifier U4 is used as the final output signal.

The analog signal three-redundancy signal selector in the flight control system is generally designed as a median selector, and the present invention uses a pure hardware circuit to realize the median selection of the three-redundancy analog signal.

The working principle of the circuit of the present invention: the three-redundancy analog signal voting uses a high-gain operational amplifier to select the median of the three values as the correct output in a feedback type circuit, as shown in Figure 1. The minimum input signal has enough error to saturate the high-gain op amp, while the maximum signal saturates the high-gain op amp in the opposite direction, so that the effects of the two signals cancel out, and the median signal is selected for output.

The circuit of the invention can be applied to the acquisition of three-redundancy analog signals and the synthesis of three-redundancy driving signals, and has high signal synthesis speed, strong versatility, low design cost, simple structure, small volume and high reliability.

Claims (1)

1. a triplex redundance analogue signal hardware voting circuit, is characterized by: described circuit includes a piece of having high increasing Benefit chip and resistance R1, R2, R3, R4 and R5, described chip by four arithmetical unit U1, U2, U3 and U4 forms；Triplex redundance input signal is respectively S1, S2, S3, input signal S1, S2, S3 concatenation operation respectively The inverting input of amplifier U1, U2, U3, output 3 end of operational amplifier U1, U2, U3 connects respectively Input 1 end of resistance R1, R2, R3, input 2 end of resistance R1, R2, R3 is put with computing after linking together The inverting input of big device U4 and input 1 end of resistance R5 are connected, and resistance R5 inputs 2 end concatenation operation amplifiers Output 3 end of U4, is simultaneously connected to the normal phase input end of operational amplifier U1, U2, U3, resistance R4 input 1 The normal phase input end of end concatenation operation amplifier U4, the input 2 end ground connection of resistance R4, operational amplifier U4's is defeated Go out 3 ends as final output signal.