CN2519404Y

CN2519404Y - Overtemperature protective breaker

Info

Publication number: CN2519404Y
Application number: CN 01279186
Authority: CN
Inventors: 曹建成
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-12-25
Filing date: 2001-12-25
Publication date: 2002-10-30
Anticipated expiration: 2011-12-25

Abstract

The utility model relates to an over temperature protection circuit breaker adopting the structure provided with a voltage divider comprising a resistance and a thermal resistance. When the temperature rises due to some reason (fire or that the temperature rises abnormally when the circuit is switched on because of poor contact of wire, cable or copper line contact controlled by the switch), the thermal resistance can sense the rise of the temperature, and then the resistance value increases, changing the dividing proportion of the voltage divider, and then the control terminal of the controlled silicon of the trigger control element is conducted through a voltage regulator diode and a detecting and controlling integrated circuit, letting the tripping coil of an electricity leakage release be electrified and absorbed, thus driving the electricity leakage circuit breaker (the switch) or the tripping mechanism of a circuit breaker with a plastic shell, dividing the main moving contact and the main static contact of the circuit breaker, thus realizing the aim of automatic dividing of the controlled circuit. The over temperature protection circuit breaker of the utility model has the functions of detecting electricity leakage, over loading and short circuit, and can detect when the temperature rises because of some reason, and the device can be used safely with high safety.

Description

Overtemperature protective circuit breaker

1, technical field:

The utility model is a kind of overtemperature protective circuit breaker that can be used for residual current circuit breaker and breaker of plastic casing, belongs to the renovation technique of circuit breaker.

2, background technology:

Existing circuit breaker has only functions such as detection of electrical leakage, overload detection, short-circuit detecting mostly, and can not detect when raising because of certain reason (electric wire, cable, copper bar joint that is subjected to switch observing and controlling as on-the-spot breaking out of fire or certain be the undesired rising of temperature during in energising because of the contact existing problems) when ambient temperature, therefore, there is alarming potential safety hazard, allow the user be difficult to relieved use.

3, summary of the invention:

The purpose of this utility model is to overcome above-mentioned shortcoming and a kind of functions such as detection of electrical leakage, overload detection, short-circuit detecting that not only have and the overtemperature protective circuit breaker that also can detect when ambient temperature raises because of certain reason is provided.Its fail safe is good, and the user can relievedly use.

Structural representation of the present utility model includes power circuit (1), current detection circuit (2) as shown in Figure 1, and wherein current detection circuit (2) is connected with power circuit (1), and current detection circuit (2) also is connected with overtemperature prote circuit (3).

Above-mentioned power circuit (1) includes transformer B, ZCT, the rc filter circuit of forming by resistance R 1, capacitor C 1, the bridge rectifier and the fuse Ru that form by diode D1～D4, current detection circuit (2) includes and detects control integrated circuit U1, voltage stabilizing didoe ZD1, controllable silicon SCR and peripheral cell resistance R 2～R4 thereof, capacitor C 2～C10, overtemperature prote circuit (3) includes the voltage divider of being made up of resistance R 6, thermistor Rt; Wherein the rc filter circuit of being made up of resistance R 1, capacitor C 1 is connected on the secondary coil of transformer ZCT, the input of the bridge rectifier of being made up of diode D1～D4 is connected on the secondary coil of transformer B, and fuse Ru is connected two inputs of bridge rectifier; The two ends of controllable silicon SCR, by resistance R 6, the voltage divider that thermistor Rt forms is connected with the output of bridge rectifier respectively, the negative electrode of voltage stabilizing didoe ZD1 is connected with the output of bridge rectifier by capacitor C 9, the end of capacitor C 2～C7 is connected with an output of bridge rectifier respectively, the other end of capacitor C 2～C7 is connected with the pin that detects control integrated circuit U1 respectively, the control end of controllable silicon SCR is connected with the pin 7 that detects control integrated circuit U1, another output of bridge rectifier is connected with the pin 8 of U1 by connecting resistance R 3, and the mid point of voltage divider is connected with the breech lock input pin 5 that detects control integrated circuit U1 by voltage stabilizing didoe ZD1.

The utility model is provided with by resistance owing to adopting, thermistor is formed the structure of voltage divider, therefore but (be subjected to the electric wire of switch observing and controlling because of certain reason when ambient temperature as on-the-spot breaking out of fire or certain, cable, the copper bar joint is because of the undesired rising of temperature when switching on of contact existing problems) when raising, thermistor can sense the rising of ambient temperature, this thermistor resistance increases, voltage divider dividing potential drop ratio is changed, again by voltage stabilizing didoe and detection control integrated circuit, trigger the conducting of control element silicon controlled control end, thereby the tripping coil energising adhesive that makes leakage tripping device drives the tripping mechanism of residual current circuit breaker (switch) or breaker of plastic casing, the active contact of circuit breaker is separated with main fixed contact, thereby realize the purpose of automatic disjunction controlled source circuit.The utility model is a kind of functions such as detection of electrical leakage, overload detection, short-circuit detecting that not only have, and the overtemperature protective circuit breaker that also can detect when ambient temperature raises because of certain reason.Its fail safe is good, and the user can relievedly use.

4, description of drawings:

Fig. 1 is a theory diagram of the present utility model;

Fig. 2 is a circuit diagram of the present utility model.

5, embodiment:

Embodiment:

Theory diagram of the present utility model includes power circuit (1), current detection circuit (2) as shown in Figure 1, and wherein current detection circuit (2) is connected with power circuit (1), and current detection circuit (2) also is connected with overtemperature prote circuit (3).

Circuit diagram of the present utility model as shown in Figure 2, above-mentioned power circuit (1) includes transformer B, ZCT, the rc filter circuit of forming by resistance R 1, capacitor C 1, the bridge rectifier and the fuse Ru that form by diode D1～D4, current detection circuit (2) includes and detects control integrated circuit U1, voltage stabilizing didoe ZD1, controllable silicon SCR and peripheral cell resistance R 2～R4 thereof, capacitor C 2～C10, overtemperature prote circuit (3) includes the voltage divider of being made up of resistance R 6, thermistor Rt; Wherein the rc filter circuit of being made up of resistance R 1, capacitor C 1 is connected on the secondary coil of transformer ZCT, the input of the bridge rectifier of being made up of diode D1～D4 is connected on the secondary coil of transformer B, and fuse Ru is connected two inputs of bridge rectifier; The two ends of controllable silicon SCR, by resistance R 6, the voltage divider that thermistor Rt forms is connected with the output of bridge rectifier respectively, the negative electrode of voltage stabilizing didoe ZD1 is connected with the output of bridge rectifier by capacitor C 9, the end of capacitor C 2～C7 is connected with an output of bridge rectifier respectively, the other end of capacitor C 2～C7 is connected with the pin that detects control integrated circuit U1 respectively, the control end of controllable silicon SCR is connected with the pin 7 that detects control integrated circuit U1, another output of bridge rectifier is connected with the pin 8 of U1 by connecting resistance R 3, and the mid point of voltage divider is connected with the breech lock input pin 5 that detects control integrated circuit U1 by voltage stabilizing didoe ZD1.Above-mentioned detection control integrated circuit U1 is an integrated package 54123.

When the utility model used, the detection of electrical leakage of circuit breaker, control device and overload detection, short-circuit detecting and controlled function were because the voltage divider that increases newly with the utility model is irrelevant, so do not influence the effect of its normal conventional func.The voltage divider of forming by resistance R 6, thermistor Rt; because the Lower Half of voltage divider is equipped with a thermistor Rt; and its parameter adjustment (below 45 ℃) when Normal Environmental Temperature does not puncture (this scope is an adjustable value); the former input voltage that the breech lock that detects control integrated circuit U1 is imported pin 5 is without any influence, and this switch is the same operate as normal with common leakage switch just.

But when ambient temperature because of certain reason (electric wire, cable, copper bar joint that is subjected to switch observing and controlling as on-the-spot breaking out of fire or certain be the undesired rising of temperature during in energising because of the contact existing problems) when raising, by temperature-sensing element---when thermistor Rt senses, this thermistor resistance increases, voltage divider dividing potential drop ratio is changed, and its mid point connect the end-point voltage rising of voltage stabilizing didoe ZD1.When this point voltage rises to the puncture voltage of voltage stabilizing didoe ZD1 (puncture voltage of this element running parameter of looking the temperature spot of required control action and thermistor is adjusted flexibly and selected for use), the breech lock input pin 5 that detects control integrated circuit U1 is idiostatic with the voltage divider mid point owing to the conducting of voltage stabilizing didoe ZD1, and its voltage is increased to it more than cut-in voltage, thereby opens latch circuit; Triggering signal of 7 pin OS output by U1, trigger the control end conducting of control element controllable silicon SCR, thereby the tripping coil energising adhesive that makes leakage tripping device drives the tripping mechanism of residual current circuit breaker (switch) or breaker of plastic casing, the active contact of circuit breaker is separated with main fixed contact, thereby realize the purpose of automatic disjunction controlled source circuit.

Claims

1, a kind of overtemperature protective circuit breaker includes power circuit (1), current detection circuit (2), and wherein current detection circuit (2) is connected with power circuit (1), it is characterized in that current detection circuit (2) also is connected with overtemperature prote circuit (3).

2, overtemperature protective circuit breaker according to claim 1, it is characterized in that above-mentioned power circuit (1) includes transformer B, ZCT, the rc filter circuit of forming by resistance R 1, capacitor C 1, the bridge rectifier and the fuse Ru that form by diode D1～D4, current detection circuit (2) includes and detects control integrated circuit U1, voltage stabilizing didoe ZD1, controllable silicon SCR and peripheral cell resistance R 2～R4 thereof, capacitor C 2～C10, overtemperature prote circuit (3) includes the voltage divider of being made up of resistance R 6, thermistor Rt; Wherein the rc filter circuit of being made up of resistance R 1, capacitor C 1 is connected on the secondary coil of transformer ZCT, the input of the bridge rectifier of being made up of diode D1～D4 is connected on the secondary coil of transformer B, and fuse Ru is connected two inputs of bridge rectifier; The two ends of controllable silicon SCR, by resistance R 6, the voltage divider that thermistor Rt forms is connected with the output of bridge rectifier respectively, the negative electrode of voltage stabilizing didoe ZD1 is connected with the output of bridge rectifier by capacitor C 9, the end of capacitor C 2～C7 is connected with an output of bridge rectifier respectively, the other end of capacitor C 2～C7 is connected with the pin that detects control integrated circuit U1 respectively, the control end of controllable silicon SCR is connected with the pin 7 that detects control integrated circuit U1, another output of bridge rectifier is connected with the pin 8 of U1 by connecting resistance R 3, and the mid point of voltage divider is connected with the breech lock input pin 5 that detects control integrated circuit U1 by voltage stabilizing didoe ZD1.

3, overtemperature protective circuit breaker according to claim 2 is characterized in that above-mentioned detection control integrated circuit U1 is an integrated package 54123.