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Overvoltage and undervoltage protection devices for single-phase power systems

A single-phase power supply, overvoltage and undervoltage technology, applied in the direction of protection against undervoltage or no voltage, can solve problems such as economic loss, overvoltage or undervoltage of single-phase power supply system, load damage, etc., to achieve guaranteed Judgment accuracy, effect of cost reduction

Active Publication Date: 2016-04-06
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In industrial and household applications, single-phase power systems are susceptible to overvoltage or undervoltage problems due to external factors, and the occurrence of overvoltage or undervoltage may cause certain damage to the load and cause certain economic loss

Method used

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  • Overvoltage and undervoltage protection devices for single-phase power systems
  • Overvoltage and undervoltage protection devices for single-phase power systems
  • Overvoltage and undervoltage protection devices for single-phase power systems

Examples

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example 1

[0077] Figure 5 for correspondence Figure 4 A schematic structural diagram of an overvoltage and undervoltage protection device for a single-phase power supply system in an example of the illustrated embodiment. Such as Figure 5 As shown, the coil of the circuit breaker L1 is connected in series in the loop of the live line L and the neutral line N of the phase-to-phase power system.

[0078] In this example, the rectification unit 20 adopts full-wave rectification, that is, four diodes D1, D2, D3, and D4 are used to perform full-wave rectification on the voltage output of the single-phase power system.

[0079] The internal structure of the DC power supply unit 10 in this example is the same as image 3 The internal structure in is the same and will not be repeated here.

[0080] The sampling unit 30 in this example includes: a voltage divider circuit, a filter circuit and a first diode D5.

[0081] Wherein, the voltage dividing circuit is used for performing voltage ...

example 2

[0100] Image 6 for correspondence image 3 A schematic structural diagram of an overvoltage and undervoltage protection device for a single-phase power supply system in an example of the illustrated embodiment. Such as Image 6 , in this example the Figure 5 The Zener tube Z1 is replaced by a current-limiting resistor R3, while other structures are the same.

[0101] The working process of the overvoltage and undervoltage protection device in this example is as follows:

[0102] When the input single-phase AC voltage is greater than 0V and lower than the under-voltage reference value, it is in an under-voltage state at this time, and the voltage at both ends of the Zener tube Z2 gradually increases to a stable value, and the voltage detection chip U1 without delay The voltage of the voltage input terminal VDD is lower than the release voltage of the voltage detection chip U1, the voltage detection chip U1 does not output high level, the triode Q1 is in the cut-off state,...

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PUM

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Abstract

The invention discloses an over-voltage and under-voltage protection device for a single-phase source system. The over-voltage and under-voltage protection device for the single-phase source system comprises a direct-current power unit, a rectifying unit, a sampling unit, an over-voltage judgment delay unit, an under-voltage judgment delay unit and a breaker triggering unit. The over-voltage judgment delay unit is a first voltage detection chip with delay. The under-voltage judgment delay unit comprises a voltage detection chip without delay, an RC charging circuit with a controllable switch and a second voltage detection chip with delay. According to the over-voltage and under-voltage protection device for the single-phase source system, the three voltage detection chips are used for achieving over-voltage and under-voltage judgment delay, and therefore the cost of the over-voltage and under-voltage protection device can be saved.

Description

technical field [0001] The invention relates to the field of power supply for power distribution systems, in particular to an overvoltage and undervoltage protection device for a single-phase power supply system. Background technique [0002] In the practical application of industry and household, the single-phase power system is susceptible to overvoltage or undervoltage due to the influence of external factors, and the occurrence of overvoltage or undervoltage may cause certain damage to the load and cause Certain economic losses. Therefore, it is necessary to use a circuit breaker to cut off the path of the single-phase power system to protect the circuit when overvoltage or undervoltage occurs in the single-phase power system. [0003] figure 1 A general structural schematic diagram of an overvoltage and undervoltage protection device for a three-phase power system is shown. Such as figure 1 As shown, the system mainly includes: a DC power supply unit 10, a rectifica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/24
Inventor 包章尧熊焘杨林黄琦
Owner SIEMENS AG
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