CN201974496U

CN201974496U - Tester for coil of residual current detector

Info

Publication number: CN201974496U
Application number: CN2011200011474U
Authority: CN
Inventors: 傅碧辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-01-05
Filing date: 2011-01-05
Publication date: 2011-09-14
Anticipated expiration: 2021-01-05

Abstract

The utility model discloses a tester for a coil of a residual current detector. A pulse circuit is formed by a time base pulse chip U3 and a resistor R3 at the periphery of the time base pulse chip U3, a diode D2, a capacitor C1, and a capacitor C2; the output ends of the capacitor C1 and the capacitor C2 are connected with a mutual inductor LN in parallel to form a residual current detection circuit; the mutual inductor LN is connected with a switch K in series; after the switch K is turned off, the current signal of the mutual inductor LN is converted by an A/D (analog to digital) data conversion chip U4, and then is transmitted to a singlechip U1, and is connected with the base electrode of an audion Q1 by an output level of the singlechip U1; the collector electrode of the audion Q1 is connected with a speaker BDD; and another output of the singlechip U1 is connected with an LCD (liquid crystal display) chip U2. The pulse circuit is adopted by the tester for the coil of the residual current detector to detect the on and off of the coil; the signal after A/D data conversion is outputted by the singlechip to drive an alarm circuit, display current data, and accurately judge the performances of the residual current detector. The tester for the coil of the residual current detector has simple structure and strong practicability.

Description

A kind of residual current probe coil proving installation

Technical field

The utility model relates to a kind of proving installation, particularly a kind of residual current probe coil proving installation.

Background technology

In the residual electricity detector mutual inductor coil is arranged, the short circuit of this coil and open circuit are all concerning the quality of whole detector, and traditional detection method just detects data with multimeter, is difficult to judge the quality of detector.

The utility model content

The purpose of this utility model is to overcome above-mentioned deficiency, and a kind of result is provided simple, practical residual current probe coil proving installation.

The technical scheme that the utility model adopted is such: a kind of residual current probe coil proving installation, by the time main pulse chip U3 resistance R 3 peripheral with it, diode D2, capacitor C 1, capacitor C 2 is formed pulsing circuit, capacitor C 1, the output terminal of C2 mutual inductor LN in parallel forms the residual current testing circuit, mutual inductor LN tandem tap K, after the K switch closure, the current signal that mutual inductor LN produces is transported to single-chip microcomputer U1 after A/D data-switching chip U4 conversion, be connected to the base stage of triode Q1 by the output level of single-chip microcomputer U1, the collector of triode Q1 connects loudspeaker BDD, and another road output of single-chip microcomputer U1 connects LCD display chip U2.

By adopting the aforementioned techniques scheme, the beneficial effects of the utility model are: this device adopts pulsing circuit magnetic test coil break-make, this signal is exported by Single-chip Controlling by after the A/D data-switching, drive warning circuit and show current data, accurately the residual current detector performance is judged that the result is simple, practical.

Description of drawings

Fig. 1 is the circuit theory diagrams of the utility model embodiment.

Embodiment

Further specify the utility model below in conjunction with the drawings and specific embodiments.

As shown in Figure 1, a kind of residual current probe coil proving installation, by the time main pulse chip U3 resistance R 3 peripheral with it, diode D2, capacitor C 1, capacitor C 2 is formed pulsing circuit, resistance R 3 resistance in series R2, behind the R3, through capacitor C ground connection, capacitor C 1, the output terminal of C2 mutual inductor LN in parallel forms the residual current testing circuit, mutual inductor LN tandem tap K, after the K switch closure, mutual inductor LN produces a 10A current signal, regulate resistance R 3 and can change the pulse voltage output valve, if the resistance by test coil mutual inductor LN coil two ends is bigger, when winding does not have turn-to-turn short circuit, its output signal is input to input end the 2nd pin of A/D data-switching chip U4, after A/D conversion by the 7th of A/D data-switching chip U4,6,5 pin are input to the 32nd of single-chip microcomputer U1 with signal, 34,25 pin, read the data of A/D data-switching chip U4 through single-chip microcomputer U1 after, when handling above setting value by single-chip microcomputer U1 internal processes, divide two-way output, the first via makes triode Q1 conducting by the 5th pin output low level of single-chip microcomputer U1 through resistance R 5, the collector of triode Q1 promotes loudspeaker BYY and sends the alarm sound that ticks after resistance R 4 current limlitings, the 12nd of secondary route single-chip microcomputer U1,7,8, the 3rd of 27 pin and LCD display circuit U2,4,5,6 pin are formed datel circuit, sending data-driven after the single-chip microcomputer U1 internal judgment instructs to LCD display circuit U2, the various data messages that show in real time current detection are so that to the judgement of residual current detector performance.

More than show and described ultimate principle of the present utility model and principal character and advantage thereof; the technician of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the explanation just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications; these changes and improvements all fall in claimed the utility model scope, and the claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims

1. residual current probe coil proving installation, it is characterized in that: by the time main pulse chip U3 resistance R 3 peripheral with it, diode D2, capacitor C 1, capacitor C 2 is formed pulsing circuit, capacitor C 1, the output terminal of C2 mutual inductor LN in parallel forms the residual current testing circuit, mutual inductor LN tandem tap K, after the K switch closure, the current signal that mutual inductor LN produces is transported to single-chip microcomputer U1 after A/D data-switching chip U4 conversion, be connected to the base stage of triode Q1 by the output level of single-chip microcomputer U1, the collector of triode Q1 connects loudspeaker BDD, and another road output of single-chip microcomputer U1 connects LCD display chip U2.