A kind of digital input expandable isolated power supply circuit for relay protection device
A technology of relay protection device and switch input, applied in the field of flat circuit, can solve the problems such as being unfavorable to the miniaturization and light weight of the relay protection device, occupying internal space, increasing the cost, etc., and achieving simple structure, low cost, circuit The effect of small board area
Active Publication Date: 2019-05-28
XIANGTAN UNIV
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Problems solved by technology
On the one hand, this approach increases the cost; on the other hand, with the increase of devices, the larger the volume, it also occupies the limited internal space of the relay protection device housing, which is not conducive to the miniaturization and weight reduction of the relay protection device
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[0017] The present invention will be further described below in conjunction with the accompanying drawings.
[0018] figure 1 It is the schematic diagram of the basic circuit of the binary input expandable isolated power supply. The +12V common ground with the working power supply of the internal processor ARM and DSP of the relay protection device generates an isolated +11V for the optocoupler of the digital input circuit. It consists of a basic circuit for generating oscillating signals, shaping and transforming, and an isolating switch pair circuit. The basic circuit consists of U1, U2, R1, R2, R3, C1, C2, U1, U2, D1, D2, D3, and D4. U1 and U2 are six-channel inverting Schmitt triggers of the same model, both powered by +12V, and the value of C2 is 0.1uF for filtering. Among them, the first channel of U1 forms a multivibrator with C1 and R1 to generate a unipolar square wave. The value of R1 is 100 kohms and the value of C1 is 22pF. The input and output of the second ch...
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An on-off input extensible isolated power circuit for a relay protection device is characterized by consisting of a base circuit for producing oscillation signals, rectification and transformation as well as an isolating switch pair circuit. The base circuit for producing oscillation signals, rectification and transformation produces two unipolar square wave outputs which have equal amplitude and have the phase difference being just half a cycle; the isolating switch pair circuit is used for producing continuous and stable isolated power outputs; an isolating switch pair comprises two isolating switches, and each isolating switch is formed by connecting a high-voltage-resistant nonpolar capacitor and the centers of double lower tubes of double-series switch diodes in series. Multiple isolated power supplies can be extended from the circuit by increasing the isolating switches. The on-off input extensible isolated power circuit has the advantages of being simple in structure, low in cost, small in size, light in weight, easy to extend and the like.
Description
technical field [0001] The invention relates to the field of flat circuits, in particular to an isolated power supply for switching value input of a relay protection device. Background technique [0002] In the power protection industry, relay protection devices are widely used and indispensable. Whether it is as small as some electric devices (such as generators, power supply lines), or as large as the entire power system, relay protection devices are required to provide fault warning signals, or directly and automatically control circuit breakers to issue trip instructions to ensure the safety of power equipment . [0003] The relay protection device has a binary input circuit, which is used to receive the output from a large number of relays and other switching nodes. It must be able to reflect its current state and respond in a timely manner to make corresponding processing actions. As a secondary device in the power system, the relay protection device often uses embed...
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IPC IPC(8): H02M1/088
CPCH02M1/088
Inventor 朱江徐雁冰许海霞田淑娟印峰邓清勇刘昊霖裴廷睿关屋大雄崔荣埈
Owner XIANGTAN UNIV