CN102998986A - Large-power intelligent quick compound switch for non-forced radiator - Google Patents

Abstract

The invention discloses a large-power intelligent quick compound switch for a non-forced radiator. The novel intelligent switch is different from an ordinary mechanical switch, an ordinary silicon-controlled rectifier and an ordinary compound switch, integrates advantages and overcomes the defects of the three switches. Zero-crossing split motion, frequent split motion and high-frequency split motion are achieved, and a forced radiator is not required. A microcontroller is disposed inside the switch and is combined with a silicon-controlled rectifier and a relay in the switch, temperature, current, outside input switch control signals and the like of the silicon-controlled rectifier are detected in real time by the microcontroller, normal operation of the switch is achieved by connecting and disconnecting the silicon-controlled rectifier and the relay in real time, and the requirements of various loads for the switch are met. In addition, current, temperature and harmonic wave are detected in real time to realize the functions of relay protection and detection fault early-warning. The invention further provides a communication interface which is communicated with an outside intelligent device and a system. The compound switch is an intelligent switch in the real sense.

Description

High power intelligent rapid composite switch without forced heat abstractor

Technical field

The present invention is the compound high-speed switch of a kind of novel intelligent semiconductor of electric switch control field and relay (contactor), be mainly used in the switch control of impact load in the low-voltage power supply system, such as control of reactive capacitance compensation, industrial electro motivation and household electrical appliances motor etc., substitute conventional relay, contactor, common combination switch or with the transwitch of forced heat radiation, be a kind of advantage of high-speed switch of existing common transwitch, have again common combination switch not need the novel intelligent rapid composite switch of the advantage of forced heat abstractor.

Background technology

In industry and civilian low pressure confession distribution (380V exchanges) system, switch is most important electric device and equipment, also is one of the most valuable device and equipment.For low power load control, generally adopt at present relay or low power controllable silicon (thyristor) to control as switch, for powerful load, then generally adopt contactor, isolating switch, powerful controllable silicon to control as switch.Because powerful transwitch all needs forced heat radiation (as air-cooled, water-cooled), cause its cost higher, weight is large, installation and maintenance are inconvenient, for this shortcoming, a kind of high power switch in conjunction with controllable silicon and contactor had appearred in recent years, be called combination switch, it conducting and by the time drop into controllable silicon, contactor closes in the middle normal course of operation, disconnect controllable silicon, avoided like this silicon controlled heating problem, therefore also saved forced heat abstractor, simultaneously owing to finished by controllable silicon in the moment of switch connection and disconnection, therefore also avoided the contact arcing of contactor, the cost requirement of contactor has been reduced a lot.A common advantage of high-power silicon controlled rectifier switch and combination switch is to realize that current over-zero conducting and zero passage disconnect, to reducing the impact of mains by harmonics and electrical network great role is arranged, and can realize without switching arc to fire-proof and explosion-proof great role being arranged, reduced simultaneously the noise of switch.Common high-power silicon controlled rectifier switch needs forced heat abstractor, although common combination switch can not wanted forced heat abstractor, in the occasion of frequent switch, common combination switch but can't replace common high-power silicon controlled rectifier switch.The switching mode of common combination switch is fixed: controlled silicon conducting → time-delay → contactor conducting → contactor disconnection → time-delay → controllable silicon disconnects.Because this fixed mode needs a fixing cycle, when the break-make frequency of electrical load greater than this fixed cycle, when being the intermittent phase less than time of this fixed cycle, common combination switch is cisco unity malfunction, this fixed cycle is usually between tens seconds to tens seconds at present, cause common combination switch can not normally put into operation in the occasion of a lot of high-speed switches, at this moment still can only adopt common high-power silicon controlled rectifier switch.

Summary of the invention

[0003] the present invention needs the shortcoming of forced heat abstractor and the shortcoming that common combination switch can not adapt to frequent switch for common high-power silicon controlled rectifier switch, solve the shortcoming of the two, possessed again the high-speed switch ability of high-power silicon controlled rectifier switch and the advantage that combination switch need not forced heat abstractor simultaneously.Its cost a little more than common combination switch, can directly substitute common high-power silicon controlled rectifier switch and combination switch far below common high-power silicon controlled rectifier switch in various occasions.High power intelligent rapid composite switch without forced heat abstractor has adopted technical grade microcontroller (MCU) as key control unit in switch inside, adopt simultaneously controllable silicon and relay (contactor) as the switch performance element.Microcontroller can judge to control the break-make of controllable silicon or relay (contactor) in tens microseconds, microcontroller is by constantly gathering the inside and outside data of switch, comprise temperature, electric current, voltage etc., judge to control controllable silicon and relay according to built-in logic after the analysis-by-synthesis, and realize passing zero trigger and cross zero to cut-off.So both so that controllable silicon need not because long-term conducting causes excess Temperature, the break-make of pilot relay at any time again need not adopt the fixedly break-make circulation pattern of common combination switch, therefore can adapt to the application of any fast frequent break-make.Without the high power intelligent rapid composite switch of forced heat abstractor owing to implanted microcontroller in inside; also have the functions such as relay protection, harmonic measure, monitoring switch itself and the warning of external unit abnormal conditions; and communication interface etc., really realized the intellectuality of switch.High power intelligent rapid composite switch without forced heat abstractor disclosed by the invention is on the basis of common high-power silicon controlled rectifier switch and common combination switch, built-in microcontroller (MCU) and corresponding software algorithm and logic have realized the high-power rapid composite switch without forced heat abstractor.Compare with common high-power silicon controlled rectifier switch, high power intelligent rapid composite switch without forced heat abstractor has saved forced heat abstractor, reduced cost, removed the possibility that the fault because of forced heat abstractor causes controllable silicon to burn out from, improve the reliability of switch, saved simultaneously the energy that forced heat abstractor is wasted; Compare with common combination switch, can realize high-speed switch without the high power intelligent rapid composite switch of forced heat abstractor, adapt to the load control of frequent switch, solved the frequently problem of switch of common combination switch.Passing zero trigger and zero passage break function have been realized simultaneously without the high power intelligent rapid composite switch of forced heat abstractor.High power intelligent rapid composite switch without forced heat abstractor mainly is comprised of the main devices such as great power bidirectional controllable silicon, relay (contactor), microcontroller (MCU), power module, temperature sensor, current sensor, silicon control zero-cross trigger circuit, communication interface and functional module.Wherein the power of bidirectional triode thyristor, relay (contactor) can be according to the size configure of load; microcontroller (MCU) has adopted two kinds of different models according to the configuration of additional function; to save cost as far as possible; if do not contain relay protection and harmonic measurement function then adopt 8 8-digit microcontroller C8051, otherwise adopt 32 8-digit microcontroller STM32.Microcontroller (MCU) can be accepted external control switch deciliter order by receiving the input of external switch amount or communication interface, comprehensively in 50 microseconds (0.05 millisecond) judge output conduction and cut-off controllable silicon, jumping/the close instruction of relay, be time of 20 milliseconds for a power frequency cycle, 50 microseconds do not have lag-effect substantially.In the switch normal work period, microcontroller constantly gathers the parameters such as the temperature, electric current, harmonic wave of switch inside, and real-time calculation and analysis is comprehensively judged the duty of adjusting controllable silicon and relay; Send warning information by communication interface when judging the switch internal fault, outside overcurrent, harmonic wave are excessive when judging, automatic trip section breaker and send warning information during the inner catastrophic failure of switch.

Description of drawings

Fig. 1 is the high power intelligent rapid composite switch theory diagram without forced heat abstractor.

Claims (2)

1. the high power intelligent rapid composite switch without forced heat abstractor of the present invention is a kind of novel intelligent switch, both be different from common mechanical switch, also be different from common controllable silicon (thyristor) switch and common combination switch, it has concentrated the advantage of above three kinds of switches, deficiency and the shortcoming of above three kinds of switches have been solved again, the standard machinery switch can not realize that the passing zero trigger zero passage disconnects, produce easily dash current and harmonic wave, and frequently switch motion; Common controllable silicon (thyristor) all needs to fill the forced heat abstractor heat radiation, otherwise will burn out controllable silicon if switch power is larger; Common combination switch can not adapt to frequent switch motion, switch cisco unity malfunction when operating frequency is higher, but the present invention without the high power intelligent rapid composite switch of forced heat abstractor realized zero passage deciliter action, can frequent deciliter action high-frequency deciliter action and do not need forced heat abstractor.

2. the technical solution used in the present invention is at switch inner built-in microcontroller (MCU); in conjunction with the controllable silicon in the switch and relay (contactor); detect in real time the silicon controlled temperature by microcontroller; electric current; outside input switch control signal etc.; the break-make of control controllable silicon and relay (contactor) realizes the normal operation of switch in real time; satisfy various loads to the requirement of switch; the built-in microcontroller (MCU) of the present invention has not only been realized the switching function without the high-power rapid composite switch of forced heat abstractor; and by detecting in real time electric current; temperature; the data such as harmonic wave have realized relay protection function and detection failure warning function; communication interface and external smart equipment and system communication are provided simultaneously, are intelligent switchs truly.

Images