Check patentability & draft patents in minutes with Patsnap Eureka AI!

Three-phase power input phase-loss detection circuit

A technology of phase loss detection and three-phase power supply, which is applied in the direction of power supply testing, multi-phase network asymmetry measurement, etc., can solve the problems affecting the reliability of the circuit, affecting the anti-interference ability of the circuit, and many peripheral devices, so as to facilitate the digital signal Processing, meeting the needs of phase loss detection, and strong anti-interference ability

Active Publication Date: 2012-08-29
埃斯倍风电科技(青岛)有限公司
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the three-phase power supply phase loss detection circuits used in the pitch control system have many peripheral devices, which increase the cost of the circuit, and also affect the anti-interference ability of the circuit, thereby affecting the reliability of the circuit.

Method used

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
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Three-phase power input phase-loss detection circuit
  • Three-phase power input phase-loss detection circuit
  • Three-phase power input phase-loss detection circuit

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0026] figure 1 It is the circuit principle diagram of the first embodiment of the three-phase power supply input phase loss detection circuit of the present invention. The phase loss detection circuit includes a first current-limiting resistor R1, a second current-limiting resistor R2 and a third current-limiting resistor R3 respectively connected to the three-phase input L1, L2, L3, including a first diode D1, a second two The pole tube D2 and the third diode D3, the anodes of the three diodes are respectively connected in series with the three current limiting resistors, the cathodes of the three diodes are connected to the input terminal 1 of the primary side of the optocoupler, and the three-phase inputs L1 and L2 are respectively connected , the fourth resistor R4 of L3, the fifth resistor R5 and the sixth resistor R6, wherein R4 is connected in parallel with R1 and D1, R5 is connected in parallel with R2 and D2, R6 is connected in parallel with R3 and D3, and the three ...

no. 2 approach

[0031] figure 2 It is the circuit principle diagram of the second embodiment of the three-phase power supply input phase loss detection circuit of the present invention. Its similarities with the first embodiment will not be repeated here. Compared with the first embodiment, the three-phase input power supply phase loss detection circuit also includes a level flipping circuit with one end connected to the pull-up resistor R7 and the other end connected to the output terminal 3 of the secondary side of the optocoupler. The level flipping circuit is connected in parallel the pull-up resistor R7.

[0032] The level inversion circuit includes a fifth diode D5 whose anode is connected to the output terminal 3 of the secondary side of the optocoupler. The cathode of the fifth diode D5 is connected to the base of the transistor T through the eighth resistor R8. The flipping circuit further includes a pull-up resistor R9 connected to the collector of the transistor T and a capacito...

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

PUM

No PUM Login to View More

Abstract

The invention provides a three-phase power input phase-loss detection circuit, comprising a first current-limiting resistance, a second current-limiting resistance, a third current-limiting resistance, a first diode, a second diode, a third diode, an optocoupler connected with the cathodes of the first diode, the second diode and the third diode, a fourth resistance, a fifth resistance, a sixth resistance, a fourth diode, a first pull-up resistance and a pull-up power supply, wherein the cathodes of the first diode, the second diode and the third diode are connected with the first input end of a primary side of the optocoupler; the fourth resistance, the fifth resistance and the sixth resistance are connected with a three-phase input and connected to the second input end of the primary side of the optocoupler; the fourth diode is connected with the first primary side input end and the second primary side input end of the optocoupler in parallel; and the first pull-up resistance is connected with an output end of a first secondary side of the optocoupler and the pull-up power supply is connected with the first pull-up resistance. The invention has the beneficial effects which mainly reflect in fewer peripheral components, low circuit cost, strong anti-interference capacity and high reliability.

Description

technical field [0001] The invention relates to a three-phase power input phase loss detection circuit, in particular to a three-phase power input phase loss detection circuit for a pitch control system driver. Background technique [0002] The pitch control system is an important component in the wind power generation system, and the drive is one of the key components of the pitch control system. To ensure the safe and reliable operation of the drive, it is necessary to provide various protections for the drive. In the wind power generation system, due to the poor power supply on site, the input phase loss protection circuit is particularly important. [0003] At present, most of the three-phase power supply phase loss detection circuits used in the pitch control system have many peripheral devices, which increase the cost of the circuit, and also affect the anti-interference ability of the circuit, thereby affecting the reliability of the circuit. Contents of the invent...

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

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/16G01R31/42
Inventor 肖庆恩傅建民林盈杰邓杰尤林森
Owner 埃斯倍风电科技(青岛)有限公司
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com