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Absence-of-ground electricity leakage protection circuit of electric water heater for single-phase power supply shower

A technology for electric water heater and leakage protection, which is applied to emergency protection circuit devices, circuit devices, emergency protection devices for automatic disconnection, etc., can solve the problem that electric water heaters cannot detect leakage, achieve high-level accuracy, and low malfunction rate , the effect of expanding the scope of use

Inactive Publication Date: 2012-07-11
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the deficiency that electric water heaters with single-phase power supply cannot detect leakage in the prior art, the present invention provides a non-ground leakage protection circuit for electric water heaters with single-phase power supply for showers, which can effectively detect leakage and protect personal safety

Method used

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  • Absence-of-ground electricity leakage protection circuit of electric water heater for single-phase power supply shower
  • Absence-of-ground electricity leakage protection circuit of electric water heater for single-phase power supply shower
  • Absence-of-ground electricity leakage protection circuit of electric water heater for single-phase power supply shower

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Embodiment 1

[0032] combine figure 1 , figure 2 Connecting the protection circuit, the non-ground leakage protection circuit of the single-phase power supply shower electric water heater includes a weak current detection circuit 1, a weak current amplification circuit 2, a precision rectification circuit 3 and a relay control circuit 4.

[0033] The weak current detection circuit 1 includes a power frequency current transformer and a resistor R1, and the power frequency current transformer is arranged at the shower outlet of the electric water heater. The power frequency current transformer and the resistor R1 are connected in parallel to the two input ends of the weak current amplifier circuit 2, and one end of the power frequency current transformer is grounded.

[0034] The weak current amplifying circuit 2 is a gain-adjustable weak signal amplifying circuit with a zeroing circuit.

[0035] The precision rectifier circuit 3 includes a high-frequency diode D1 and a capacitor C2. The ...

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Abstract

The invention belongs to the field of protection circuits, and discloses an absence-of-ground electricity leakage protection circuit of an electric water heater for single-phase power supply shower. The absence-of-ground electricity leakage protection circuit of the electric water heater for single-phase power supply shower comprises a weak current detection circuit, a weak current amplifying circuit, a precise rectifying circuit and a relay control circuit, wherein the weak current detection circuit comprises a work frequency current inductor and a resistor R1; the work frequency current inductor is connected in parallel with the resistor R1 and is connected with two input ends of the weak current amplifying circuit; and one end of the work frequency current inductor is grounded. The weak current amplifying circuit is an amplifying circuit with a zeroing circuit. With the adoption of the protection circuit, the detection of electricity leakage can be effectively carried out, personal safety is protected, and the accuracy is high.

Description

technical field [0001] The invention belongs to the field of protection circuits, and more specifically relates to a non-ground leakage protection circuit for an electric water heater with single-phase power supply for showers. Background technique [0002] During the use of the electric shower water heater, if there is an electric leakage, it will directly lead to electrification of the spray hot water. Due to the humid environment, it is difficult for the user to leave the dangerous area in a short period of time, which will eventually lead to electric shock. [0003] In order to prevent the above situation from happening, electric water heaters for showers are generally equipped with a leakage protector. When there is a leakage, the leakage protector will act and cut off the main power supply, thereby ensuring personal safety. [0004] At present, in order to achieve electricity safety, people have also taken some leakage protection measures, which are mainly to install l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/32
Inventor 冯德仁马丽华李小龙丁鑫龙侯庆蛟
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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