CN205811509U

CN205811509U - Power load limiter

Info

Publication number: CN205811509U
Application number: CN201620385806.1U
Authority: CN
Inventors: 李录锋
Original assignee: Jiangsu Institute of Architectural Technology
Current assignee: Jiangsu Institute of Architectural Technology; Jiangsu Jianzhu Institute
Priority date: 2016-05-03
Filing date: 2016-05-03
Publication date: 2016-12-14
Anticipated expiration: 2026-05-03

Abstract

The utility model discloses a kind of power load limiter, including power circuit, load detecting circuit, monostable circuit, on-off circuit and warning circuit；Civil power is converted into 12V DC voltage by power circuit, provides running voltage for monostable circuit, on-off circuit and warning circuit；Load detecting circuit detection load current, formation triggering level；Monostable circuit forms a switch controlling signal under the effect of triggering level；Switch controlling signal controls on-off circuit and disconnects or connecting subscribers participating load；Warning circuit is connected with on-off circuit.This utility model has automatic electric limiting and controls function, and it is energy normal power supply when bearing power (electric power of user) is less than power limitation, when bearing power exceedes power limitation, can cut off rapidly the supply line of user, give a warning overload user simultaneously.

Description

Power load limiter

Technical field

This utility model relates to a kind of power load limiter, belongs to safety technique for using electricity field.

Background technology

Electric energy is a kind of clean energy resource, and modern society people have be unable to do without electricity, even the Nyingchi Prefecture that China is the remotest, Within 2012, rural area current on time all reaches 100%.Along with the raising of people's living standard, household electrical appliance get more and more, and electric power is more Come the biggest.In particularly summer, one family refrigerator, kitchen range, air-conditioning, colour TV be used together, and electric power can increase suddenly, often Can be due to the excessive problem occurring suddenly switching port-cullis protection of complexity.The consequence caused is that all electrical equipments all cannot work, There will be night and blacken the name of, affect people's life.

Summary of the invention

This utility model purpose is to provide a kind of power load limiter, this limiter can according to the situation of setting, when When user load is excessive, automatic disconnecting consumers power supply.

To achieve these goals, this utility model one power load limiter, including power circuit, load detecting electricity Road, monostable circuit, on-off circuit and warning circuit；Civil power is converted into 12V DC voltage by power circuit, for monostable electricity Road, on-off circuit and warning circuit provide running voltage；Load detecting circuit detection load current, formation triggering level；Monostable State circuit forms a temporary steady switch controlling signal under the effect of triggering level；Switch controlling signal controls on-off circuit and breaks Open or connecting subscribers participating load；Warning circuit is connected with on-off circuit.

This utility model has automatic electric limiting and controls function, and it is less than in bearing power (electric power of user) and limits merit Energy normal power supply during rate, when bearing power exceedes power limitation, can cut off rapidly the supply line of user, use overload simultaneously Family gives a warning.

Accompanying drawing explanation

Fig. 1 is this utility model theory diagram；

Fig. 2 is that this utility model improves embodiment theory diagram；

Fig. 3 is this utility model power circuit principle figure；

Fig. 4 is this utility model load detecting circuit schematic diagram；

Fig. 5 is this utility model on-off circuit and warning circuit schematic diagram.

Detailed description of the invention

Below in conjunction with the accompanying drawings this utility model is described further.

As it is shown in figure 1, a kind of power load limiter, including power circuit, load detecting circuit, monostable circuit, open Close circuit and warning circuit；Civil power is converted into 12V DC voltage by power circuit, for monostable circuit, on-off circuit and warning Circuit provides running voltage；Load detecting circuit detection load current, formation triggering level；Monostable circuit is in triggering level Effect is lower forms a switch controlling signal；Switch controlling signal controls on-off circuit and disconnects or connecting subscribers participating load；Report to the police electric Road is connected with on-off circuit.

As in figure 2 it is shown, be to strengthen triggering level stability further, this utility model also includes positive-feedback circuit；Load The triggering level that testing circuit is formed enters monostable circuit after positive-feedback circuit is strengthened.

As it is shown on figure 3, described power circuit is by decompression capacitor C5, resistance R6, rectifier bridge stack UR, Zener diode VS and filter Ripple electric capacity C4 forms；Electric capacity C5 and resistance R6 parallel connection form reduction voltage circuit, Zener diode VS and filter capacitor C4 parallel connection and are formed Filter circuit of pressure-stabilizing；Civil power is first by reduction voltage circuit blood pressure lowering, through rectifier bridge stack UR direct current, then exports after voltage regulation filtering.

As shown in Figure 4, described load detecting circuit includes current transformer, diode VD1, resistance R1, rheostat RP, electricity Holding C1 and electric capacity C2, diode VD1, resistance R1 and rheostat RP are sequentially connected in series the second siding ring two being connected on current transformer End；Electric capacity C1 is in parallel with rheostat RP, and rheostat RP connects letter with the second siding ring junction point of current transformer by electric capacity C2 Number ground.Current transformer, diode VD1, resistance R1 and rheostat RP form a loop, and diode VD1 is by current transformer Second siding ring produce alternating current be converted to DC current, under the filter action of electric capacity C1 and electric capacity C2, rheostat The glissile segment output DC voltage of RP, this DC voltage is as the triggering signal of monostable circuit, and adjusting rheostat RP can change Become output to set.

As it is shown in figure 5, described on-off circuit includes resistance R4, transistor switch V and relay switch K；Monostable circuit The switch controlling signal of output enters the base stage of transistor switch V through resistance R4；The colelctor electrode of transistor switch V connects 12V direct current Voltage, emitter stage is through the control termination signal ground of relay switch K；Contact sets K1 of relay switch K is user load On and off switch, user load connects normally closed point.When user load exceedes setting value, the switch controlling signal that monostable circuit is formed Transistor switch V is turned on, and the normally closed disconnection of contact sets K1 of relay switch K, user load disconnects.

As it is shown in figure 5, described warning circuit includes generating resistance R5, luminous tube VL and alarm bell, luminous tube VL and resistance R5 goes here and there After connection, the control end with relay switch K is in parallel；The normally opened point of contact sets K1 of alarm bell contact relay switch K.Work as user load When exceeding setting value, the switch controlling signal that monostable circuit is formed makes transistor switch V turn on, and relay switch K touches The normally opened Guan Bi of some group K1, alarm bell sounds the alarm sound, and luminous tube VL obtains electroluminescence.

Claims

1. a power load limiter, it is characterised in that include power circuit, load detecting circuit, monostable circuit, switch Circuit and warning circuit；Civil power is converted into 12V DC voltage by power circuit, for monostable circuit, on-off circuit and warning electricity Road provides running voltage；Load detecting circuit detection load current, formation triggering level；Monostable circuit is at the work of triggering level With the temporary steady switch controlling signal of lower formation one；Switch controlling signal controls on-off circuit and disconnects or connecting subscribers participating load；Report Alert circuit is connected with on-off circuit.

Power load limiter the most according to claim 1, it is characterised in that also include positive-feedback circuit；Load detecting The triggering level that circuit is formed enters monostable circuit after positive-feedback circuit is strengthened.

Power load limiter the most according to claim 2, it is characterised in that described power circuit by decompression capacitor C5, Resistance R6, rectifier bridge stack UR, Zener diode VS and filter capacitor C4 composition；Electric capacity C5 and resistance R6 parallel connection form blood pressure lowering electricity Road, Zener diode VS and filter capacitor C4 parallel connection form filter circuit of pressure-stabilizing；Civil power is first by reduction voltage circuit blood pressure lowering, through over commutation Bridge heap UR direct current, then export after voltage regulation filtering.

Power load limiter the most according to claim 3, it is characterised in that described load detecting circuit includes that electric current is mutual Sensor, diode VD1, resistance R1, rheostat RP, electric capacity C1 and electric capacity C2, diode VD1, resistance R1 and rheostat RP are successively Series connection is at the second siding ring two ends of current transformer；Electric capacity C1 is in parallel with rheostat RP, rheostat RP and current transformer Second siding ring junction point connect signal ground by electric capacity C2.

Power load limiter the most according to claim 4, it is characterised in that described on-off circuit includes resistance R4, crystalline substance Body pipe switch V and relay switch K；The switch controlling signal of monostable circuit output enters transistor switch V's through resistance R4 Base stage；The colelctor electrode of transistor switch V connects 12V DC voltage, and emitter stage is through the control termination signal ground of relay switch K； Contact sets K1 of relay switch K is the on and off switch of user load, and user load connects normally closed point.

Power load limiter the most according to claim 5, it is characterised in that described warning circuit include generating resistance R5, Light pipe VL and alarm bell, light pipe VL is in parallel with the control end of relay switch K after connecting with resistance R5；Alarm bell contact relay switch K The normally opened point of contact sets K1.