CN2133073Y

CN2133073Y - Electronic insurance box

Info

Publication number: CN2133073Y
Application number: CN 92209140
Authority: CN
Inventors: 孟祥君
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-05-05
Filing date: 1992-05-05
Publication date: 1993-05-12
Anticipated expiration: 2002-05-05

Abstract

The utility model relates to a protecting device having the advantages of electrical safety, and energy conservation. The protecting device is provided with a current limiting circuit composed of a sensitive piece, etc. A delay trigger circuit, a control circuit composed of a relay and the node of the relay, and a status display circuit. When loads overload, the protecting device can automatically limit current to perform the function of automatic safety, which does not need to be adjusted by a user. The protecting device can prevent electricity stealing and electric explosive. The protecting device can replace an old single sluice type disaster box or monopole insurance. The self work of the protecting device is reliable, and the protecting device is suitable for places where the single electricity is used.

Description

Electronic insurance box

It is big and wayward that the utility model relates to a kind of Protector for using electricity, particularly residential building, office, schoolhouse and some power consumption, easily produces the local power supply electronics safety box of electricity fire.

At present; power supply current-limiting protection facility such as single-phase lock formula safety box; insulation booth is fragile; dangerous; and often can not select fuse on demand, and easily make the sparking of ohmic contact end cause fire during overload, need change fuse during short circuit; so not only bothered but also wasted the aluminium lead metal, this safety box can't be anti-electricity-theft.Furnace controller and the electric protective device that occurs in recent years and for example, all because of power consumption is big, volume can not be applied greatly.Such one of China is had a vast territory, and the country that electric weight is abundant how can the safe and reasonable electricity consumption, again can be anti-electricity-theft, and be the problem that a utmost point need solve.

The purpose of this utility model is: provide a kind of simple in structure, cost is low, can be anti-electricity-theft, again can automatic current limiting, and automatic time delay, work does not need the user to do any adjustment automatically, safe and reliable power supply electronics safety box that can voluntary insurance.

The utility model is by status display circuit, and delay trigger circuit is by the responsive sheet MGP that has current-limiting resistance XR, resistance R ₁, diode D ₁The current-limiting circuit that is composed in series, and be serially connected between power supply and the delay trigger circuit and relay J that the anode of an end and controllable silicon SCR joins and itself with often open node JK ₁, switching node JK ₂The control circuit of being formed is often opened node JK as what connect load power source ₁With the other end of relay J and connect the back and connect switching node JK with responsive sheet MGP ₂In often open, normally closed node is composed in series with relay J, delay trigger circuit respectively.

The operation principle of this device is: behind power connection, alternating current 220V voltage by XR resistance and MGP through R ₁D ₁Carry out rectification, the voltage after the rectification is through C ₁Be added in by R after the filtering ₂C ₂On the delay circuit of forming.Work as C ₂When the voltage at two ends reached the BT33 conducting voltage, BT33 exported a trigger voltage through D ₂After be added on the trigger electrode G of controllable silicon SCR, at this moment SCR turn-on relay J powers up adhesive self-locking simultaneously.This moment, whole delay trigger circuit and controllable silicon SCR circuit were cut off, the relay J operate as normal, and show by status display circuit.When load exceeded rated power, the pressure drop that voltage produces on current-limiting resistance XR increased, and the Joule heat on the current-limiting resistance XR increases at this moment, when reaching the deformation temperature of responsive sheet MGP, on the responsive sheet with node disconnect, relay J disconnects thereupon, power supply output is cut off.Because output is non-loaded, thus the decline of the Joule heat on the current-limiting resistance XR, after about one minute, responsive sheet MGP node auto-closing, circuit is connected, and circuit is in the delay working state, and circuit is connected automatically after delaying time, and output voltage is arranged.If load this moment is still greater than specified output, circuit still automatically shuts down so, repeats said process, at this moment status display circuit display delayed operating state.The bright expression of green light has output voltage, the bright expression no-output of red light voltage.

The utility model is owing to adopted said structure, and no matter which type of operating state it is in, and it can both be worked automatically, need not any adjustment, plays insurance, energy-conservation effect that again can be anti-electricity-theft, is desirable Protector for using electricity.

Below in conjunction with accompanying drawing the utility model is described in detail:

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

1 current-limiting circuit, 2 delay trigger circuits, 3 control circuits, 4 display circuits.

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

The utility model has two input terminals by one, and the seal box of two outlet terminals is equipped with in it by current-limiting circuit, electronic insurance box that delay trigger circuit, control circuit and status display circuit constituted.Status display circuit is mainly by LED ₁, LED ₂Deng composition, bright display delayed of red light or overload condition, the bright demonstration normal operating conditions of green light.Delay trigger circuit, it is by the R of series connection ₂, C ₂Form the time-delay part, by single-transistor BT33, resistance and D ₂And controllable silicon SCR composition triggering part, the time length of time-delay depends on R ₂C ₂Time constant, and can select as required, the time range of time-delay can be from 5 minutes to 50 minutes; By the responsive sheet MGP of the XR that has current-limiting resistance, dropping resistor R ₁, rectifier diode D ₁Be composed in series current-limiting protection circuit; and be serially connected between power supply and the delay trigger circuit; can be according to required rated power, responsive sheet can be made all size, said control circuit be the relay J of joining by an end and controllable silicon SCR anode and with often open node JK ₁, switching node JK ₂Form, that can connect load power source often opens node JK ₁With the other end of relay J and connect the back and connect switching node JK with responsive sheet MGP ₂In often open, normally closed node connects with relay J, delay trigger circuit respectively.

This electronic insurance box since when operate as normal except that the display part only relay J work; therefore power consumption own is minimum; again because of simple in structure, reliable operation, being in does not need the people to safeguard in which type of operating state; can play the protective effect of power supply automatically; simultaneously can be anti-electricity-theft and energy-conservation, this device can be made into all size, therefore can be widely used in various electricity consumption occasions; be a kind of desirable as family, the power protection facility that machine-operated school, public place etc. are located.

Claims

A kind of electronic insurance box comprises display circuit, delay trigger circuit, it is characterized in that comprising:

A, by the responsive sheet MGP that has current-limiting resistance XR, resistance R ₁, diode D ₁The current-limiting circuit that is composed in series, and be serially connected between power supply and the delay trigger circuit;

B, the relay J that links by an end and controllable silicon SCR anode and often open node JK ₁, switching node JK ₂Form control circuit, that connects load power source often opens node JK ₁With the other end of relay J and connect the back and connect switching node JK with responsive sheet MGP ₂In often open, normally closed node is connected with relay J, delay trigger circuit respectively.