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A kind of household air -conditioning indoor and outdoor communication prevention error protection circuit

A protection circuit, indoor and outdoor technology, applied to emergency protection circuit devices, electrical components, etc., can solve problems such as damage to communication devices

Active Publication Date: 2019-02-22
QINGDAO HAIER TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide an indoor and outdoor communication error protection circuit for household air conditioners to solve the problem of damage to communication devices in the prior art when the power supply and the communication circuit are abnormally connected

Method used

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  • A kind of household air -conditioning indoor and outdoor communication prevention error protection circuit
  • A kind of household air -conditioning indoor and outdoor communication prevention error protection circuit
  • A kind of household air -conditioning indoor and outdoor communication prevention error protection circuit

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Embodiment 1

[0026] An indoor and outdoor communication error-proof protection circuit for a household air conditioner according to an embodiment of the present invention is as follows: image 3 As shown, the error prevention protection circuit includes a half-wave rectification high-voltage detection circuit and an optocoupler self-locking circuit; the half-wave rectification high-voltage detection circuit is connected to the indoor and outdoor communication terminal COMM of the indoor and outdoor communication circuit of the household air conditioner for detecting the Whether the indoor and outdoor communication terminal COMM has a high-voltage input; the optocoupler self-locking circuit is respectively connected with the half-wave rectification high-voltage detection circuit and the sending optocoupler IC4 of the indoor and outdoor communication circuit of the household air conditioner, for when the half-wave rectification high voltage When the detection circuit detects that the indoor a...

Embodiment 2

[0039] An indoor and outdoor communication error-proof protection circuit for a household air conditioner according to an embodiment of the present invention is as follows: Figure 5 As shown, compared with Embodiment 1, the error protection circuit of this embodiment adds a second optocoupler IC6, and the second optocoupler IC6 is connected in series with the sending optocoupler IC4.

[0040] In Example 1, the sending optocoupler IC4 adopts PC851 optocoupler, and the secondary withstand voltage Vceo of PC851 optocoupler is 300V. When the AC input is about 230V, the peak voltage is about 320V, which has exceeded the limit. When the AC input is higher, the PC851 may be damaged. This situation will still happen when COMM is wrongly connected to L and has a higher voltage input for a long time.

[0041] In order to solve the above problems, this embodiment adds the same optocoupler IC6 in series with the optocoupler IC4, so that the withstand voltage between the COMM terminal an...

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Abstract

The invention discloses a household air-conditioning indoor-outdoor communication failure-proof protection circuit comprising a half-wave rectification high-voltage detection circuit and an optical coupler self-locking circuit. The half-wave rectification high-voltage detection circuit is connected with an indoor-outdoor communication terminal of a household air-conditioning indoor-outdoor communication circuit and is used for detecting whether a high-voltage input exists at the indoor-outdoor communication terminal; and the optical coupler self-locking circuit is connected with the half-wave rectification high-voltage detection circuit and a sending coupler of the household air-conditioning indoor-outdoor communication circuit and is used for locking an off state of the sending coupler when the high-voltage input exists at the indoor-outdoor communication terminal. According to the invention, because of the half-wave rectification high-voltage detection circuit and the optical coupler self-locking circuit, the communication optocoupler and other devices can be protected from being damaged when the high-voltage input exists at the indoor-outdoor communication terminal, so that a problem that devices like a communication optocoupler are damaged because of misoperation, any abnormal situation like abnormal switching of the indoor-outdoor communication terminal between the strong current and weak current in the low-standby-power-consumption scheme, or imperfection of the scheme can be solved.

Description

technical field [0001] The invention relates to the field of circuit control, in particular to an indoor and outdoor communication error-proof protection circuit for a household air conditioner. Background technique [0002] At present, the indoor and outdoor communication circuits of household air conditioners generally adopt a common N-wire current loop scheme, and the communication power is generally obtained through half-wave rectification. Some are located on the outdoor side, and some are located on the indoor side. flow direction. [0003] When the communication circuit is located indoors, its circuit principle is as follows: figure 1 As shown; when the communication circuit is located outside the outdoor, its circuit principle is as follows figure 2 shown. refer to figure 1 and figure 2 , when sending indoors and receiving outdoors, the outdoor sending optocoupler IC4 is always on, assuming that when the indoor sending is high level "1", the indoor sending opt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H11/00
Inventor 关宏星董金盛宋艳凤魏铁成
Owner QINGDAO HAIER TECH