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Single-phase power-supply wiring judgement method and single-phase power supply phase testing circuit

A technology of phase detection and judgment method, which is applied to the phase angle between voltage and current, power supply test, and measurement of electricity, etc. It can solve the problem of high cost of correct connection between live wire and neutral wire, achieve simple software design, reduce the risk of electric shock, The effect of improving safety performance

Active Publication Date: 2008-05-21
QINGDAO HISENSE HITACHI AIR CONDITIONING SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the high cost of judging whether the live wire and the neutral wire are connected correctly when single-phase power supply is performed in the prior art, and provides a method for judging the connection of the live wire and the neutral wire, which is realized by using the original phase detection circuit of the three-phase power supply in the electrical equipment. The function of judging the positive connection and reverse connection of the live wire and the neutral wire enhances the safety of the circuit board

Method used

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  • Single-phase power-supply wiring judgement method and single-phase power supply phase testing circuit
  • Single-phase power-supply wiring judgement method and single-phase power supply phase testing circuit
  • Single-phase power-supply wiring judgement method and single-phase power supply phase testing circuit

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Embodiment 1

[0028] Embodiment 1, as shown in Figure 2, this embodiment connects two wires on the basis of Figure 1, one wire is connected between L2 and N terminal, the other wire is connected between L3 and E terminal, and The output of the phase detection branch is used as the input of the single chip microcomputer, and the purpose of judging whether the live wire and the neutral wire are correctly connected during single-phase power supply according to the present invention can be realized by using this circuit diagram.

[0029] Its basic design idea is: in single-phase power supply, the single-phase power is connected from the L1 and N terminals, and the output terminal INT1 of the first phase detection branch is connected to one of the interrupt pins of the single-chip microcomputer, which acts as the first signal of the single-chip microcomputer. Interrupt source; the output terminal INT2 of the second phase detection branch is connected with another interrupt pin of the single-chip ...

Embodiment 2

[0049] Embodiment 2. In this embodiment, only the input end of one of the phase detection branches is connected to the E terminal through wiring to determine whether the live wire and the neutral wire are correctly connected. In this embodiment, the connection between L2 and E terminal is taken as an example for specific description. The circuit structure is shown in FIG. The level signal state of the output can be used to determine whether the live wire and the neutral wire are connected correctly.

[0050] When the single-phase power supply is positively connected, that is, when the L1 terminal is connected to the live wire and the N terminal is connected to the neutral wire, the voltage between L1 and the ground wire is close to the single-phase power supply voltage, and this voltage is passed through the resistor divider network R01, R02, R05, R06 and After the Zener diode ZD01 or ZD02 divides the voltage, it is applied to both ends of the light-emitting diode of the optoc...

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Abstract

The present invention discloses a judgment method for a single phase power wiring, which solves the problems of reverse connection of the front line and the null line caused by a possible failure in single phase power supply. The safety performance of the circuit board is improved on the condition that the hardware cost is basically not increased. The specific technical proposal is that a front line terminal, a null line terminal, a ground wire terminal and a phase detecting circuit which is used for detecting the open-phase or anti-phase of a three-phase alternating-current supply are arranged on an outdoor unit main circuit board; wherein, the phase detecting circuit comprises two phase detecting branches. The input end of a first phase detecting branch is connected with the null line terminal through a wiring. The input end of a second phase detecting branch is connected with the ground wire terminal. Whether the front line and the null line are accurately connected is judged by detecting the state of the electric signal exported by the second phase detecting branch. In addition, the present invention also discloses a single phase power supply phase detecting circuit which is used for detecting and judging whether the front line and the null line are accurately connected during single phase power supply.

Description

technical field [0001] The invention relates to a single-phase power supply wiring judging method, in particular to a judging method for correct connection of live wires and neutral wires when electrical equipment is powered by single-phase, and a single-phase power supply phase detection circuit. Background technique [0002] Many existing electrical equipment, such as commercial air-conditioning outdoor units, use three-phase and single-phase common main circuit boards, and the main circuit boards are generally equipped with phase detection circuits to detect phase loss and reverse phase in three-phase power supply. , but there is no detection circuit to determine whether the live wire and the neutral wire are reversely connected when there is no single-phase power supply. However, in the actual installation and maintenance process, if the live wire and the neutral wire are reversed, the fuse in the circuit will fail and fail to protect, which seriously threatens the safet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/42G01R31/02G01R25/00
Inventor 石靖峰李希志
Owner QINGDAO HISENSE HITACHI AIR CONDITIONING SYST
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