CN2867678Y

CN2867678Y - Current foldback and overvoltage protective device

Info

Publication number: CN2867678Y
Application number: CN 200620053495
Authority: CN
Inventors: 陆德昌
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-01-10
Filing date: 2006-01-10
Publication date: 2007-02-07
Anticipated expiration: 2016-01-10

Abstract

An over-current and over-voltage protection device includes a voltage detection module, a current-voltage conversion module, and a voltage threshold discrimination and processing module, a bistable latch module and a relay pushing module respectively accessed to a power supply circuit module, wherein the voltage detection module is connected to a power grid at one end thereof and the voltage threshold discrimination and processing module at the other end thereof; the current-voltage conversion module is connected with the voltage threshold discrimination and processing module; the bistable latch module is respectively connected with the voltage threshold discrimination and processing module and the relay pushing module; and the power supply circuit module is connected with a digital RF circuit module, which is connected with the bistable latch module. The voltage threshold discrimination and processing module subjects output signals of the current-voltage conversion module and the voltage detection module to threshold discrimination, delay and amplification. The digital RF circuit module can reset the load circuit remotely. The utility module has convenient application and high safety and reliability.

Description

A kind of overcurrent and overvoltage protector

Technical field

The utility model relates to the circuit protection device field, particularly relates to the overcurrent and overvoltage protector that a kind of remote control lamp, appliance switch are used.

Background technology

Circuit protection device of the prior art if only fuse is set, when the overcurrent fuse burns out, must be changed again, uses very inconvenient.As air switch or leakage switch are set in circuit, they generally are to utilize solenoid or bimetal leaf that circuit is protected.In the protective device of this structure, the shortcoming of solenoid is that time of delay is too short and uncontrollable, and when capacitive load was big, when loop current did not surpass nominal load, solenoid may produce misoperation dropout phenomenon, influences the operate as normal of load; Bimetal leaf then is to make the sheet metal bending by the electric current heating functioin, and to reach the purpose of open circuit, its time of delay is oversize, and circuit is not had real-time overcurrent protection.Simultaneously, circuit protection device of the prior art, though circuit also is provided with over-pressure safety device, its device is too short time of delay, and can not adjust, and is difficult to accurate control, can produce misoperation dropout phenomenon equally, influences the operate as normal of load.In addition, after the circuit overcurrent protective device is threaded off, can only lean on by hand circuit is reclosed, can't realize Long-distance Control, in the occasion of high voltage, big electric current, have certain danger.

Summary of the invention

Goal of the invention of the present utility model is to overcome the deficiencies in the prior art, and a kind of esy to use, safe and reliable, overcurrent and overvoltage protector of being used for remote control lamp, appliance switch is provided.

Goal of the invention of the present utility model is achieved in that a kind of overcurrent and overvoltage protector; it is characterized in that: described overcurrent and overvoltage protector comprises voltage detection module; current/voltage modular converter and insert the threshold voltage discriminating processing module of power supply circuits module respectively; bistable state latch module and relay push module; wherein an end of voltage detection module is connected on the power supply grid; the other end is connected with threshold voltage discriminating processing module; the current/voltage modular converter is connected with threshold voltage discriminating processing module, and the bistable state latch module is connected with the relay push module with threshold voltage discriminating processing module respectively.

Described bistable state latch module is connected with a digital RF circuit module, and the digital RF circuit module other end is connected with the power supply circuits module.

Described threshold voltage discriminating processing module comprises high-frequency filter circuit module, threshold voltage discrimination module, delay circuit module and signal amplification module.

Described current/voltage modular converter comprises the inspection streamline circle that is located in the load and is located at the transformation coil of end of convert.

Described digital RF circuit module comprises digital RF receiver module and digital decoding module.

Described voltage detection module is composed in series by piezo-resistance and protective resistance.

The utility model improves existing overcurrent and overvoltage protector; current/voltage modular converter and voltage detection module can convert the current signal of load to threshold voltage discriminating processing module required voltage signal exactly; in the delay circuit module of threshold voltage discriminating processing module; dropout time of delay that can be when corresponding delay cell comes the adjusting device overcurrent-overvoltage in the apolegamy delay circuit module; effectively prevent misoperation dropout phenomenon; has control accurately, the advantage that can set arbitrarily time of delay.After load circuit is threaded off and opened circuit, only need can reclose circuit by the straighforward operation of digital RF circuit module, easy to operate, safe and reliable.

Description of drawings

Fig. 1 is the principle schematic of the utility model most preferred embodiment.

Embodiment

Below in conjunction with accompanying drawing the utility model is further specified.

According to shown in Figure 1; overcurrent and overvoltage protector of the present utility model comprises power supply circuits module 1, voltage detection module 2, current/voltage modular converter 3, threshold voltage discriminating processing module 4, digital RF circuit module 5, bistable state latch module 8 and relay push module 9, and power supply circuits module 1 is connected with threshold voltage discriminating processing module 4, bistable state latch module 8 and relay push module 9 respectively.Current/voltage modular converter 3 is connected on the threshold voltage discriminating processing module 4, and an end of voltage detection module 2 is connected on the power supply grid, and the other end is connected with threshold voltage discriminating processing module 4.Bistable state latch module 8 is connected with the input of digital RF circuit module 5, threshold voltage discriminating processing module 4 outputs and relay push module 9 respectively.

When the load overcurrent; current/voltage modular converter 3 is converted into required voltage signal to load current signal; this voltage signal enters threshold voltage discrimination module 15 after being sent to high-frequency filter circuit module 14 in the threshold voltage discriminating processing module 4; when if signal surpasses the threshold voltage that the threshold values discrimination module sets; then Shu Chu relevant voltage signal is sent to delay circuit module 16; the adjusted signal entering signal amplification module 17 of delaying time; signal after the amplification promotes 8 upsets of bistable state latch module and makes 9 actions of relay push module; load circuit K switch open circuit; load circuit disconnects, and has protected K switch and loop.Wait for that digital RF circuit module 5 sends signal, deliver to bistable state latch module 8,8 upsets of bistable state latch module reset and make 9 actions of relay push module, and contactor K closes and powers to the load again, recovers normally to use.

When the load overvoltage; whether surpass piezo-resistance 13 default rated voltages by voltage detection module 2 detection of grid voltages; over proof voltage makes piezo-resistance 13 conductings in the module; export a superpressure signal; the delay circuit module 16 that this superpressure signal is directly delivered in the threshold voltage discriminating processing module 4 is adjusted back entering signal amplification module 17; signal after the amplification promotes 8 upsets of bistable state latch module and makes 9 actions of relay push module; load circuit K switch open circuit; no longer provide electric energy, protection switch K and load to load.Wait for that digital RF circuit module 5 sends signal instruction, deliver to bistable state latch module 8,8 upsets of bistable state latch module reset and make 9 actions of relay push module, and contactor K closes and powers to the load again, recovers normally to use.

Claims

1. overcurrent and overvoltage protector; it is characterized in that: described overcurrent and overvoltage protector comprises voltage detection module (2); current/voltage modular converter (3) and insert the threshold voltage discriminating processing module (4) of power supply circuits module (1) respectively; bistable state latch module (8) and relay push module (9); wherein voltage detection module (2) one ends are connected on the power supply grid; the other end is connected with threshold voltage discriminating processing module (4); current/voltage modular converter (3) is connected with threshold voltage discriminating processing module (4), and bistable state latch module (8) is connected with relay push module (9) with threshold voltage discriminating processing module (4) respectively.

2. according to the described overcurrent and overvoltage protector of claim 1, it is characterized in that: described bistable state latch module (8) is connected with a digital RF circuit module (5), and digital RF circuit module (5) other end is connected with power supply circuits module (1).

3. according to the described overcurrent and overvoltage protector of claim 1, it is characterized in that: described threshold voltage discriminating processing module (4) comprises high-frequency filter circuit module (14), threshold voltage discrimination module (15), delay circuit module (16) and signal amplification module (17).

4. according to the described overcurrent and overvoltage protector of claim 1, it is characterized in that: described current/voltage modular converter (3) comprises inspection streamline circle (10) that is located on the load circuit and the transformation coil (11) that is located at end of convert.

5. according to the described overcurrent and overvoltage protector of claim 2, it is characterized in that: described digital RF circuit module (5) comprises digital RF receiver module (6) and digital decoding module (7).

6. according to the described overcurrent and overvoltage protector of claim 1, it is characterized in that: described voltage detection module (2) is composed in series by piezo-resistance (13) and protective resistance (12).