CN2586297Y

CN2586297Y - Current switch

Info

Publication number: CN2586297Y
Application number: CN 02258705
Authority: CN
Inventors: 卢景华
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-12-06
Filing date: 2002-12-06
Publication date: 2003-11-12
Anticipated expiration: 2012-12-06

Abstract

The utility model relates to a current switch, which comprises a rectification circuit and a processing circuit, wherein, a core penetration mutual inductor is connected in a measured circuit. When current passes through a measured loop, alternating current output by the core penetration mutual inductor is changed into direct current through the rectification circuit and is delivered to an LED. An MOS tube in the processing circuit is matched with the LED to control the on-off of a relay coil and the relay is provided with a normally-open and normally-close switch. The utility model has the advantages of low cost and small size, and can be applied to environments of various power and is especially adapted to occasions which need the on-off of an alarm current only.

Description

A kind of current switch

Technical field

The utility model relates to a kind of current switch, particularly aims at the current relay that needs the applications that indication or alarm electric current have or not.

Background technology

Many occasions need be alarmed having or not of electric current, such as the driver when driving, can't find initiatively that automobile tail light has damaged, and just a kind of alarm device need be set, and can in time remind the driver having increased traveling security; When damaging, also need timely alarm such as the high-altitude irradiation light

Usually, utilize current relay can detect having or not of electric current, still, present this kind current relay volume is bigger, the cost height, and the place of use is limited to, especially when the electric current environment that is suitable for was inequality, the change that need do was more, has increased production cost.

The content of utility model

The purpose of this utility model be to provide a kind of low cost, volume small and exquisite, be applicable to any electric current environment can alarm the current switch that electric current has or not.

In order to reach above-mentioned purpose, the utility model is reached like this:

The utility model comprises a rectification circuit and a treatment circuit, and wherein the punching instrument transformer is connected in the circuit under test, and when having electric current to pass through in the loop to be measured, the alternating current of punching instrument transformer output changes direct current into by rectification circuit, is sent to light-emitting diode; Metal-oxide-semiconductor in the treatment circuit cooperates the logical and disconnected of control relay coil, relay band one normally-open normally-close switch with light-emitting diode.

Owing to use the punching instrument transformer in the utility model, inserting in the circuit under test does not increase this detected loop load, and that can monitor electric current in this circuit operate as normal has or do not have; The punching instrument transformer can be responded to the small electric current that passes through in the circuit under test, and will make lumination of light emitting diode after this electric current amplification, come the on-off of control processing circuit relay coil by the metal-oxide-semiconductor that cooperates with it, and provide switching value by the normally-open normally-close switch of relay.When being applicable to various occasions and function, the relay model that need only adjust in the external treatment circuit gets final product, and does not need to do too big change.The circuit that uses in the utility model has low cost, the small and exquisite characteristics of volume through integrated processing.

Description of drawings

Fig. 1 is a circuit connection diagram of the present utility model.

Embodiment

As shown in Figure 1, the utility model comprises a rectification circuit 2 and a treatment circuit 3, wherein punching instrument transformer 21 is connected on one and has in the circuit under test 1 of load 11, when having electric current to pass through in the loop to be measured, the alternating current of punching instrument transformer 21 outputs changes direct current into by the bridge rectifier of being made up of diode D1D2D3D4 in the rectification circuit 2 22, be sent to light-emitting diode D5, make it luminous; Metal-oxide-semiconductor 33 in the treatment circuit 3 cooperates the logical and disconnected of these circuit relay 31 coils of control with light-emitting diode D5, wherein resistance D6 and D7 shield to metal-oxide-semiconductor 33, prevent its damage, and this relay 31 is with a normally-open normally-close switch 32.Wherein normal open switch 3,4 can connect relay indicating light, has electric current to pass through in the expression circuit under test 1; And normally closed switch 1,2 can external warning device or Programmable Logic Controller, when no current in the circuit under test 1 by the time, can in time alarm or convert to Programmable Logic Controller acceptable switching value.

During use, punching instrument transformer 21 can be responded to the Weak current that passes through in the circuit under test 1, through making light-emitting diode D5 luminous after rectification circuit 2 amplifications, control the on-off of external treatment circuit 3 relays 31 coils by the metal-oxide-semiconductor 33 that cooperates with it, the normally-open normally-close switch 32 by relay 31 provides switching value then.Startup of the present utility model does not need to provide the external power supply support, as long as have electric current to pass through to start work in the circuit under test 1, connects treatment circuit 3 by metal-oxide-semiconductor 33 and provides the work indication; When no current in the circuit under test 1 passed through, treatment circuit 3 open circuits then provided alarm signal or start warning device, reach the effect of alarm.

Claims

1, a kind of current switch, it is characterized in that: comprise a rectification circuit and a treatment circuit, wherein the punching instrument transformer is connected in the circuit under test, when loop to be measured has electric current to pass through, the alternating current of punching instrument transformer output changes direct current into by rectification circuit, is sent to light-emitting diode; Cooperate the logical and disconnected of control relay coil, relay band one switch with light-emitting diode by the metal-oxide-semiconductor in the treatment circuit.

2, current switch according to claim 1 is characterized in that: described switch is the normally-open normally-close switch.