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Shunt quitting control circuit and method for automatic shunt I/F conversion circuit

A conversion circuit and automatic shunt technology, applied in control/regulation systems, logic circuit interface devices, logic circuit connection/interface layout, etc., can solve the problems of increased hardware, difficulty in implementation, setting of hysteresis, etc., to achieve a wide range of applications , Conducive to miniaturization and flexible settings

Active Publication Date: 2018-06-26
航天科工惯性技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of circuit has some defects at the same time. When the shunt state is converted to the direct conversion state, the control of exiting the shunt is more complicated. It is necessary to solve the monitoring of the input current, the setting of the hysteresis between the entry point and the exit point, and the exit of the shunt state. For problems such as unlocking, if analog circuits are used to achieve the above control, additional conditioning circuits, comparison circuits, etc. need to be added, and the hardware will increase a lot. Due to the limitation of product layout area, etc., it is difficult to realize

Method used

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  • Shunt quitting control circuit and method for automatic shunt I/F conversion circuit
  • Shunt quitting control circuit and method for automatic shunt I/F conversion circuit
  • Shunt quitting control circuit and method for automatic shunt I/F conversion circuit

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Embodiment 1

[0028] refer to Figure 1-2 , the present embodiment provides a kind of exit shunt control circuit of automatic shunt I / F conversion circuit, adopts FPGA or CPLD all-digital realization, and its composition comprises:

[0029] Clock management unit 1, direct conversion state synchronous D flip-flop 2, shunt conversion state low-frequency synchronous D flip-flop 3, shunt conversion state high-level frequency synchronous D flip-flop 4, count input logic AND gate 5, count clear logic OR gate 6. A synchronous addition counter 7 , an exit shunt control logic operation unit 8 , an exit shunt control latch and unlock unit 9 , an exit shunt control synchronous output D flip-flop 10 and a NOT gate 11 .

[0030] Further, the input of the exit shunt control circuit includes a clock, a shunt state comparison signal, and a direct conversion state comparison signal, and its output is an exit shunt control signal.

[0031] The input shunt state comparison signal and the direct conversion st...

Embodiment 2

[0049] refer to figure 2 and image 3 , the present embodiment provides a control method for an automatic shunt I / F conversion circuit to exit shunt, including:

[0050] S1. The shunt state comparison signal changes from high level to low level, indicating that the I / F conversion circuit will enter the shunt conversion working state, and the low-frequency synchronous D flip-flop 3 and the high-frequency synchronous D flip-flop 4 compare the shunt state in the shunt conversion state The signal is synchronized, and the low-frequency synchronous D flip-flop 3 in the shunt conversion state passes through the NOT gate 11 and passes the counting and clearing logic OR gate 6 to clear the synchronous addition counter 7;

[0051] Wherein, the input shunt state comparison signal and the direct conversion state comparison signal are signals obtained by comparing the output of the integration circuit of the I / F conversion circuit with the set high and low threshold levels. When the out...

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Abstract

The invention provides a shunt quitting control circuit and method for an automatic shunt I / F conversion circuit. The shunt quitting control circuit for the automatic shunt I / F conversion circuit is realized through adopting an FPGA or CPLD. The shunt quitting control circuit includes a clock management unit, a direct conversion state synchronous D flip-flop, a shunt conversion state low-frequencysynchronous D flip-flop, a shunt conversion state high-frequency synchronous D flip-flop, a count input logic AND gate, a count zero clearing logic OR gate, a synchronous addition counter, a shunt quitting control logic operation unit, a shunt quitting control latch and unlocking unit, and a shunt quitting control synchronous output D flip-flop. According to the shunt quitting control circuit andmethod for the automatic shunt I / F conversion circuit of the invention, the magnitude of input current is monitored through the timing of the integration segment of the input current; the shunt quitting control logic operation unit can be changed, so that a shunt quitting point can be changed; the setting of the shunt quitting point is flexible, and the amount of hysteresis entering the shunt quitting point can be arbitrarily adjusted according to requirements; and peripheral analog circuits are not needed, so that the miniaturization of the automatic shunt current / frequency conversion circuit can be facilitated. The shunt quitting control circuit and method have a wider application range.

Description

technical field [0001] The invention relates to an exit shunt control circuit and method of an automatic shunt I / F conversion circuit. Background technique [0002] The current / frequency conversion circuit is mainly used in the field of inertial navigation, also known as the I / F conversion circuit. Its main function is to convert the current signal into a proportional frequency pulse signal. The current / frequency conversion circuit belongs to the field of A / D conversion. [0003] There are three types of current / frequency conversion circuits: the first is to directly convert the input current; the second is to convert the input current after shunting; the third is to directly convert the input current when the input current is small. When the current is large, the input current is shunted and then converted. The third way is the fusion of the first way and the second way. When the switching between the two states is completed autonomously without external control, it is cal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0175G05F1/565
CPCG05F1/565H03K19/017509
Inventor 赵洪利庞葳张秋月刘松姜华王玉泽李铁成王珂孙景雷后建义
Owner 航天科工惯性技术有限公司