CN203117278U

CN203117278U - Multi-loop residual current detection circuit

Info

Publication number: CN203117278U
Application number: CN 201320045547
Authority: CN
Inventors: 吴贵森
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-01-22
Filing date: 2013-01-22
Publication date: 2013-08-07
Anticipated expiration: 2023-01-22

Abstract

The utility model relates to a multi-loop residual current detection circuit. The multi-loop residual current detection circuit includes a residual current collection circuit, an analog switch circuit, an A/D data conversion circuit, a single chip microcomputer control circuit and a ZigBee wireless module circuit; output signals of the residual current collection circuit are transmitted to the A/D data conversion circuit through the analog switch circuit; output signals of the A/D data conversion circuit are transmitted to the single chip microcomputer control circuit; and output signals of the single chip microcomputer control circuit are transmitted to the ZigBee wireless module circuit. According to the multi-loop residual current detection circuit of the utility model, based on a multi-loop scanning mode, the ZigBee wireless module circuit is driven by the single chip microcomputer control circuit so as to transmit alarm signals to a host machine alarm center; and the multi-loop residual current detection circuit is widely applicable to low-voltage distribution systems in factories, schools and houses so as to prevent electrical fires.

Description

Multichannel residual current testing circuit

Technical field

The utility model relates to a kind of testing circuit, particularly be a kind of multichannel residual current testing circuit.

Background technology

Residual current is commonly called as leakage current; use in the middle of main application isolating switch or the earth leakage protective device protection equipment; and the fire that residual current causes; account for more than 40% of fire ratio; bring serious threat for people's the security of the lives and property, traditional residual current testing circuit is confined to the single channel onsite alarming.

The utility model content

The purpose of this utility model is to overcome above-mentioned deficiency, and a kind of multichannel residual current testing circuit is provided.

The technical scheme that its technical matters that solves the utility model adopts is: multichannel residual current testing circuit, comprise residual current Acquisition Circuit, analog switching circuit, A/D data converting circuit, single chip machine controlling circuit and ZigBee wireless module circuit, the output signal of described residual current Acquisition Circuit transfers to the A/D data converting circuit through analog switching circuit, the output signal of described A/D data converting circuit is sent to single chip machine controlling circuit, and the output signal of described single chip machine controlling circuit sends to ZigBee wireless module circuit.

Described residual current Acquisition Circuit is gathered the residual current signal by inductance L N, and the end of described inductance L N is connected to the contact J1-1 end of relay J 1, and the other end of described inductance L N is connected to current rectifying and wave filtering circuit.

Described analog switching circuit connects the bleeder circuit that resistance R 7-R21 forms, and forms 8 sections different simulation residual current voltage signals.

Described ZigBee wireless module circuit adopts ZM2410 wireless communication module U4.

By adopting above-mentioned technical scheme, the beneficial effects of the utility model are: the utility model is by the multiloop scan mode, drive ZigBee wireless module circuit by single chip machine controlling circuit and send alerting signal to the main frame alarm center, be widely used in the low-voltage distribution systems such as factory, school, dwelling house the protection electrical fire.

Description of drawings

Fig. 1 is frame assumption diagram of the present utility model;

Fig. 2 is circuit theory diagrams of the present utility model.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

As shown in Figure 1 and Figure 2, multichannel residual current testing circuit of the present utility model, comprise residual current Acquisition Circuit 1, analog switching circuit 11, A/D data converting circuit 12, single chip machine controlling circuit 2 and ZigBee wireless module circuit 21, the output signal of described residual current Acquisition Circuit 1 transfers to A/D data converting circuit 12 through analog switching circuit 11, the output signal of described A/D data converting circuit 12 is sent to single chip machine controlling circuit 2, and the output signal of described single chip machine controlling circuit 2 sends to ZigBee wireless module circuit 21.

Described residual current Acquisition Circuit 1 is gathered the residual current signal by inductance L N, the end of described inductance L N is connected to the contact J1-1 end of relay J 1, the other end of described inductance L N is connected to current rectifying and wave filtering circuit, when inductance L N one end is connected in contact J1-1 end, when relay J 1 not adhesive, contact J1-1 and J1-2 are that normally closed point is in conducting state, contact J1-2 is in ground state, induction is arranged during electric leakage signal if pass inductance L N this moment, the inductance L N other end produces small AC signal through diode D3 rectification, output direct current electric leakage signal is sent to single-chip microcomputer U1 and sends alerting signal.When pressing K switch 1, single-chip microcomputer U1 output low level is ended triode T1, relay J 1 adhesive, its contact J1-1 no longer connects with contact J1-2, but contact J1-1 and J1-3 connection are connected to the A point, A point current potential is subjected to the 3rd foot control system of analog switch module U1, the 4th of analog switch module U1,2,5,1,12,15,14,13 pin and resistance R 7-R121 form bleeder circuit, form 8 sections different simulation residual current voltage signals, this signal flows to resistance R 1 through inductance L N Inside coil, through diode D1, the D2 amplitude limit is adjusted, diode D3 rectification, resistance R 2 current limlitings, capacitor C 2 filtering, control by the analog switch module of single-chip microcomputer U1 U1 is switched, the sudden change residual current magnitude of voltage of the 3rd pin output different brackets of analog switch module U1, when surpassing single-chip microcomputer U1 internal database magnitude of voltage, after single-chip microcomputer U1 internal processes is judged, send control signal, by the 6th of ZM2410 wireless communication module U4, the 10th of 7 ends and single-chip microcomputer U1,11 ends are formed ZigBee wireless module circuit, ZM2410 wireless communication module U4 is the embedded serial ports transparent transmission of the Zigbee of built-in 2.4GHZ (some multiple spot and point-to-multipoint) communications protocol, can satisfy telecommunication, send the AT instruction by single-chip microcomputer U1 ZM2410 wireless communication module U4 is realized wireless data transceiving, switch pin with the RS-485 direction, send current failure message to data center.Reach the early warning protective effect, thereby avoid influencing people's operate as normal and life because of electric leakage outage at once.

Above-described only is a preferred embodiment of the present utility model, can not limit the scope that the utility model is implemented, and every equalization of doing according to the utility model claim changes and decorates, and all should still belong in the scope that the utility model contains.

Claims

1. multichannel residual current testing circuit, it is characterized in that: comprise residual current Acquisition Circuit (1), analog switching circuit (11), A/D data converting circuit (12), single chip machine controlling circuit (2) and ZigBee wireless module circuit (21), the output signal of described residual current Acquisition Circuit (1) transfers to A/D data converting circuit (12) through analog switching circuit (11), the output signal of described A/D data converting circuit (12) is sent to single chip machine controlling circuit (2), and the output signal of described single chip machine controlling circuit (2) sends to ZigBee wireless module circuit (21).

2. multichannel residual current testing circuit according to claim 1, it is characterized in that: described residual current Acquisition Circuit (1) is gathered the residual current signal by inductance L N, the end of described inductance L N is connected to the contact J1-1 end of relay J 1, and the other end of described inductance L N is connected to current rectifying and wave filtering circuit.

3. multichannel residual current testing circuit according to claim 1 is characterized in that: described analog switching circuit (11) connects the bleeder circuit that resistance R 7-R21 forms, and forms 8 sections different residual current voltage signals of simulating.

4. multichannel residual current testing circuit according to claim 1 is characterized in that: described ZigBee wireless module circuit (21) employing ZM2410 wireless communication module U4.