Relay protection device detection circuit

A technology of a relay protection device and a detection circuit, which is applied in the field of circuits, can solve the problems of excessive wear of circuit components, increase of current, burnt out optocouplers, etc., and achieve the effect of ensuring normal operation.
CN101957413AInactive Publication Date: 2011-01-26深圳市华力特电气有限公司
4 Cites 21 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
深圳市华力特电气有限公司
Publication Date
2011-01-26
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The embodiment of the invention discloses a relay protection device detection circuit, which is used for ensuring normal work of a circuit element in the detection circuit when voltage boosting is detected. The detection circuit of the embodiment of the invention comprises a constant current circuit and an optical coupler isolating output circuit, wherein an input end of the constant current circuit is connected with detection voltage; the input end of the optical coupler isolating output circuit is connected with the output end of the constant current circuit; the constant current circuit comprises a transient diode (D1) and a constant current diode (D2) which are connected in series; the transient diode (D1) is used for providing threshold voltage and allocating the input detection voltage; the constant current diode (D2) is used for providing stable current for the detection circuit; and the optical coupler isolating output circuit is used for transmitting a low-voltage control signal. In addition, the detection circuit can realize compatibility of input of alternating current detection voltage and direct current detection voltage by improvement.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the field of circuits, in particular to a detection circuit for 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] Due to the wide application of relay protection devices, the range span of its protection voltage is also very large. A detection circuit is needed to convert the high-voltage signal in the protection circuit into a low-voltage control signal, so as to facilitate the control of computers or some intelligent electronic devices.

[0004] In the prior art, the general detection circuit ado...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More