A frequency start circuit
A technology of starting circuit and frequency, applied in the direction of instrument, computer control, simulator, etc., can solve the problems of poor high and low temperature stability of phase-locked loop, reduce the reliability of anti-icing controller, etc., to improve reliability, simple structure, easy to use effect achieved
Active Publication Date: 2021-06-01
WUHAN AVIATION INSTR
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Problems solved by technology
[0003] The frequency and phase automatic adjustment part in the existing anti-icing controller is used to generate the excitation signal frequency. The phase-locked loop has poor high and low temperature stability. Under high and low temperature conditions, the output frequency of the phase-locked loop exceeds the normal working range, or even no frequency signal output , reducing the reliability of the anti-deicing controller
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[0016] The present invention will be described in further detail below.
[0017] refer to figure 1 , a frequency starting circuit, comprising a starting frequency generator, a phase-locked loop circuit, and an excitation frequency output circuit; the starting signal output by the starting frequency generator is connected to the 9 pins of the phase-locked loop of the phase-locked loop circuit; the lock of the phase-locked loop circuit The 4-pin output excitation frequency signal of the phase loop is connected to the excitation frequency output circuit; the start-up frequency generator includes a single-chip microcomputer U1 and a frequency processing circuit; the single-chip microcomputer U1 generates a digital pulse signal as the input signal of the frequency start-up circuit, and the single-chip microcomputer U1 can also use DSP digital signal processor and CPLD programmable logic device.
[0018] Described starting frequency processing circuit comprises electric capacity C1...
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The invention belongs to the technical field of anti-icing controllers and relates to a frequency starting circuit. The frequency starting circuit includes a starting frequency generator, a phase-locked loop circuit and an excitation frequency output circuit. Among them, the start-up frequency generator generates a start-up frequency signal from the I / O port of the single-chip microcomputer, which is isolated by the inverter and the optocoupler, and outputs a stable frequency signal. On the one hand, the phase-locked loop circuit locks the sensor feedback frequency signal and outputs the excitation frequency signal; on the other hand, it receives the starting frequency signal to ensure that the phase-locked loop circuit can normally lock the frequency and generate Stable and reliable excitation frequency signal. The excitation frequency output circuit modulates and shapes the excitation frequency signal output by the phase-locked loop circuit to improve the reliability of the circuit operation. In addition, the circuit adopts common electronic components, and has a simple structure and is easy to implement.
Description
technical field [0001] The invention belongs to the technical field of anti-icing controllers, and relates to a frequency starting circuit Background technique [0002] The anti-icing controller uses frequency and phase automatic adjustment components to provide excitation signals to the icing sensor to vibrate and pick up the signal for detection. When the icing on the sensor reaches a preset value, an icing warning signal is provided to the aircraft , and at the same time automatically turn on the heater on the sensor to heat and de-ice the sensor. [0003] The frequency and phase automatic adjustment part in the existing anti-icing controller is used to generate the excitation signal frequency. The phase-locked loop has poor high and low temperature stability. Under high and low temperature conditions, the output frequency of the phase-locked loop exceeds the normal working range, or even no frequency signal output , reducing the reliability of the anti-deicing controlle...
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IPC IPC(8): G05B19/042
CPCG05B19/0423G05B2219/25257
Inventor 肖岸飞黄时军
Owner WUHAN AVIATION INSTR