A frequency difference control system and method

A control system and frequency difference technology, which is applied in the field of frequency difference control system, can solve problems such as poor stability and low precision of crystal oscillators, and achieve the effect of ensuring stability and strong anti-interference

Active Publication Date: 2016-05-04
CHONGQING CHUANYI AUTOMATION
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Problems solved by technology

[0007] In view of this, the present invention provides a frequency difference control system and method for solving the problems of low precision and poor stability of the crystal oscillator frequency difference in the prior art

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  • A frequency difference control system and method
  • A frequency difference control system and method
  • A frequency difference control system and method

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Embodiment Construction

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0038] The embodiment of the present invention discloses a frequency difference control system and method. In the system, the first crystal oscillator generates the first clock source, the second crystal oscillator generates the second clock source, and the triggers respectively oscillate with the first crystal The device is connected with the second crystal oscillator for generating the first narrow pulse according to the first clock source, generating the sec...

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Abstract

The invention discloses a frequency difference control system and a frequency difference control method. In the control system, a digital-to-analog converter is connected with a microprocessor and a reference voltage source respectively; a driving circuit is connected with the digital-to-analog converter; driving voltage can be generated by the digital-to-analog converter according to a control signal transmitted by the microprocessor and reference voltage; and the capacitance of a variable capacitance diode is changed according to output voltage of the driving circuit, so that change of frequency of a second crystal oscillator is realized. According to the system and the method, the frequency of the second crystal oscillator is accurately changed, the frequency difference value of two crystal oscillators can be kept at a fixed value, the stability of the frequency difference is guaranteed, and the problems of poor stability and low accuracy of the frequency difference value of the two crystal oscillators caused by extremely easy influence of interference pulse on the frequency of the second crystal oscillator in a capacitance charge-discharge mode existing in the prior art are solved.

Description

technical field [0001] The invention relates to the field of automatic control, and more specifically relates to a frequency difference control system and method. Background technique [0002] Both the pulse radar level gauge and the guided wave radar level gauge are instruments used to measure the height of the material. They are usually installed on the top of the tank that needs to measure the height of the material. The level gauge emits electromagnetic wave pulses through the probe or antenna. Going out, when the electromagnetic wave encounters the measured substance, part of the energy is reflected back. By calculating the time difference between the electromagnetic wave emission pulse and the return pulse, the distance from the material to the reference plane of the level meter can be obtained, and then according to the relevant parameters such as the tank height. The height of the material can be calculated. [0003] Due to the very fast propagation speed of electro...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/00G05B19/042
Inventor 陈俊赵俊杰刘君夏涛范耀锋
Owner CHONGQING CHUANYI AUTOMATION
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