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A safe leakage protection method

A technology of leakage protection and leakage protector, which is applied in the direction of automatic disconnection emergency protection devices, emergency protection circuit devices, electrical components, etc., can solve problems such as exposure, reduce the risk of electric shock, and improve the effect of using safety

Active Publication Date: 2020-04-28
YUYAO JIARONG ELECTRONICS & ELECTRIC APPLIANCE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As disclosed in the Chinese invention CN3178492A, the earth leakage protection device with electrified protection of the ground wire includes three poles of the phase line L, the neutral line N, and the ground line E with switches, and the zero-sequence current mutual inductance passing through the phase line L and the neutral line N. device, test circuit, release, rectifier circuit, power step-down, thyristor, and a current detector and dual-input amplifier, one end of the primary coil of the current detector is connected to the ground wire E, and the primary coil of the current detector The other end of the coil is connected in series with a large-resistance current-limiting step-down circuit and then connected to the neutral line N, the secondary coil of the current detector is connected to one input end of the dual-input amplifier, and the two output ends of the dual-input amplifier are respectively connected to the two The trigger pole of a thyristor is connected, and the output terminal of the zero-sequence current transformer is connected to the other input terminal of the dual-input terminal amplifier; although this invention can simultaneously detect whether the neutral wire, the live wire and the ground wire are leaking, but in actual use , users often replace cheap and inferior products when the leakage protector is damaged, which makes the leakage protection system useless and exposes users to the risk of electric shock

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0048] Such as figure 1 As shown, after power-on, the AC input module provides working voltage for the action module, leakage detection module and low-voltage power supply module, and the low-voltage power supply module provides working voltage for the leakage protection control module and the port module.

[0049] Such as figure 2 As shown, the water heater controller is set on the water heater display board, and the leakage protector communicates with the water heater control through the port module. The leakage protector also provides working voltage for the water heater controller through the port module. connection, the port module includes a signal isolation module, and the signal isolation module is used to electrically isolate the input and output terminals of the signal;

[0050] Such as Figure 3 to Figure 10 As shown, after power-on, the leakage protection control chip U2 prohibits the power-on coil RL1 from being powered on, and sends the product code to the wat...

Embodiment 2

[0063] Such as Figure 12 As shown, after power-on, the leakage protector first prohibits the power-on coil from connecting to the load power supply, and then performs the self-test procedure:

[0064] Mains timing signal detection steps: such as Figure 4 As shown, the mains detection circuit composed of resistor R5, resistor R12, resistor R24 ​​and Zener diode ZD1, the leakage protection control chip U2 collects the timing signal of the mains through the mains detection circuit, if the timing signal is normal, enter the temperature detection step ; If the judging module does not collect the timing signal, then maintain the prohibition of the power-on coil from connecting to the load power supply, and do not send the product code to the water heater control chip U3;

[0065] Temperature detection step: the leakage protection control chip U2 detects the temperature value between the pin and the socket through the thermistor arranged in the leakage protector, and compares it w...

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Abstract

The invention discloses a safe leakage protection method, which relates to the electric safety field, comprising: a leakage protector and a load control module; The leakage protector is used for disconnecting or turning on the power supply of the load; After receiving the identification signal, the load control module compares the identification signal with the pre-stored information. If the identification signal matches the pre-stored information, the load control module sends a power-on permission signal to the leakage protector. The leakage protector prohibits the power supply of the load from being turned on until the leakage protector receives the power-on permission signal; Compared with the prior art, the product code of the current leakage protector is verified by the water heatercontroller, and the power on of the current leakage protector is prohibited before the verification, so that the user cannot replace the current leakage protector privately, the risk of electric shockto the user is reduced, and the use safety is improved.

Description

technical field [0001] The invention relates to the field of electrical safety, in particular to a safe leakage protection method. Background technique [0002] With the improvement of living standards, the penetration rate of household water heaters is getting higher and higher, and electric shock incidents are not uncommon when using water heaters. Therefore, water heaters need a leakage protector to protect the safety of users, and the existing leakage protectors have many deficiencies. [0003] As disclosed in the Chinese invention CN3178492A, the earth leakage protection device with electrified protection of the ground wire includes three poles of the phase line L, the neutral line N, and the ground line E with switches, and the zero-sequence current mutual inductance passing through the phase line L and the neutral line N. device, test circuit, release, rectifier circuit, power step-down, thyristor, and a current detector and dual-input amplifier, one end of the primar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/32F24H9/20
CPCF24H9/2014H02H3/32
Inventor 钱加灿
Owner YUYAO JIARONG ELECTRONICS & ELECTRIC APPLIANCE CO LTD