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Frequency protection circuit

A technology of frequency protection and high frequency protection, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of high maintenance and replacement costs, poor safety, etc., to ensure accuracy and stability, avoid signal interference, and circuit connection relationship Set reasonable effects

Active Publication Date: 2017-07-14
河北博宏感应技术股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention proposes a frequency protection circuit, which solves the technical problems of poor safety and high maintenance and replacement costs of the current inverter control system in the prior art

Method used

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Embodiment Construction

[0029] 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.

[0030] Such as Figure 1~2 As shown, a frequency protection circuit proposed by the present invention includes a circuit input terminal, a circuit output terminal, and a primary high-frequency protection circuit 1,

[0031] The primary high-frequency protection circuit 1 includes a first frequency divider U3, the input terminal of the first frequency divider U3 is connected to the circuit input terminal, the output terminal is connected to the second NOR gate ...

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Abstract

The invention belongs to the technical field of an inverter, and provides a frequency protection circuit. The frequency protection circuit comprises a primary high-frequency protection circuit, wherein the primary high-frequency protection circuit is connected with a phase lock board circuit by a plug-in terminal strip and comprises a first frequency divider, an input end of the first frequency divider is connected with the plug-in terminal strip, an output end of the first frequency divider is connected with both of an input end of a second NOR gate and an input end of a second bistable-state contactor, an output end of the second bistable-state contactor is connected with another input end of the second NOR gate, an output end of the second NOR gate is connected with the plug-in terminal strip, the frequency protection circuit also comprises a secondary high-frequency protection circuit and a low-frequency protection circuit, and the secondary high-frequency protection circuit is connected with the phase lock board circuit by the plug-in terminal strip. The frequency protection circuit is ingenious in concept, and the technical problems of poor safety and high maintenance and replacement cost of a current inverter control system in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of inverters and relates to a frequency protection circuit. Background technique [0002] Inverter is a device that converts direct current (DC) into alternating current (AC). It is composed of inverter bridge, control logic and filter circuit. It is widely used in air conditioners, home theaters, electric grinding wheels, electric tools, computers, TVs, etc. . The inverter is generally controlled by a resonant circuit. When it works near the resonant point, it is in a high-impedance state. At this time, the resonant current is the smallest in this frequency range, which is the safe area for the circuit to work. When the load changes or there is a sudden change in the open circuit or short circuit, the frequency will suddenly change up or down, no matter which direction it changes, it will cause a sharp increase in the resonant current and cause damage to the inverter. However, the current inverter control...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/122
CPCH02H7/122
Inventor 赵憨兵张智轩宗震刘小陈张新学
Owner 河北博宏感应技术股份有限公司
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