CN2405361Y

CN2405361Y - Overload protection and delay valtage stabilizer for diode

Info

Publication number: CN2405361Y
Application number: CN 99251422
Authority: CN
Inventors: 徐和舜
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-10-21
Filing date: 1999-10-21
Publication date: 2000-11-08
Anticipated expiration: 2009-10-21

Abstract

The utility model has a function of using a reverse penetration current of a crystal diode to control a delay circuit. Consequently, the purpose of controlling over load is obtained, the safety of domestic appliances is ensured, and the reliability of a voltage stabilizer is raised.

Description

Diode overload protection time-delay pressurizer

Diode overload protection time-delay pressurizer of the present invention is a kind of family expenses pressurizer with overload protection and delay function, belongs to electric controller.

In order to guarantee the stable of household electrical appliance voltage, the voltage stabilizing of normal employing time-delay pressurizer.It is by power supply, sampling amplifier, and action component, transformer and time-delay electric power system are formed.Its energy automatic stabilisation voltage can be connected circuit by automatic time delay when sending a telegram here after the power failure again.Common this pressurizer does not have overload protection function, in case it is excessive to load, burns transformer in the machine easily, even misfortune and supply line, causes unnecessary loss.

It is that thermal relay is housed in inputing or outputing circuit that a kind of pressurizer with overload protection is arranged, and circuit is turn-offed in contact tripping during overload.This overload protection is played a role, but owing to increased a pair of contact that must bear big electric current, so the also relative increase of cost, and reduced reliability.

The method of another kind of overload protection is to detect the temperature of transformer with thermistor, again detection signal is amplified the back with control relay with amplifier, and relay contact disconnects when transformer is overheated in the overload, has cut off circuit, reaches the purpose of control overload.This method has certain effect equally, but circuit is comparatively complicated.

Purpose one of the present invention is to seek a kind of new method of controlling time-delay pressurizer overload, and another purpose is to adopt new method that a kind of time-delay pressurizer with overload protection is provided.

New method is: the function of removing to control the RC delay circuit in the time-delay pressurizer with the reverse penetration current of crystal diode, the time-delay electric power system is heated up when too high at transformer, automatically shut down circuit, and when normal temperature, can recover normal function, thereby reach the purpose that control is transshipped.

Concrete way is: at the capacitor C two ends of RC delay circuit of time-delay pressurizer, by crystal diode of on line reverse parallel connection (referring to that diode polarity is opposite with capacitor C both end voltage polarity), and be positioned over diode between transformer core and the coil or be placed in the coil.Because diode is oppositely to be connected in the circuit, so it only flows through reverse penetration current, reverse penetration current is very little under the Yin Changwen again, so it is inoperative during normal temperature.The reverse penetration current increase is very fast when temperature raises, and when temperature reached certain value, it can make the capacitor C discharge, had destroyed the operating state of delay circuit, causes the counter-rotating of time-delay electric power system, line disconnection.Recover just often when temperature, all restore to the original state again, power supply after the time-delay electric power system is delayed time again, the diode overload protection time-delay pressurizer that Here it is newly forms.

The contrast accompanying drawing is looked at the overall picture of diode overload protection time-delay pressurizer now: 1 is ac power input end among the figure.After AC power inserted, sampling amplifier 3 was sampled, contrasts, is amplified input and output voltage immediately, and the signal of telecommunication after the amplification enters action component 4; According to the signal of telecommunication that sampling amplifier provides, action component switches or has changed the tap position of transformer 5, makes it export satisfactory voltage.6 are the time-delay electric power system, and it is by the RC delay circuit, and time-delay amplifier 7 and relay 8 are formed.After energized, DC power supply is charged to delay capacitor C through resistance R from the A point, and the voltage signal on the delay capacitor C is delivered on the time-delay amplifier 7 and handled.When the delay capacitor charging reached certain value, the time-delay amplifier is sent the signal of telecommunication made relay 8 adhesives.Connected outlet line, made output 2 can export electric current of voltage regulation.D is a diode among the figure, and it, and is placed between the iron core of transformer 5 and the coil or in the coil to the two ends of delay capacitor C by the line reverse parallel connection.As transship, the temperature of transformer 5 will raise fast, diode D experiences temperature and raises, reverse penetration current increases rapidly, when reaching to a certain degree, makes this delay capacitor C that has charged discharge, cause whole time-delay electric power system counter-rotating, relay discharges, and break contact turn-offs output channel, has controlled the generation of overload accident.When temperature dropped to a certain extent, diode D is too small ineffective in the line because of reverse penetration current, and the RC delay circuit is able to restore funcitons.Restore electricity after the time-delay.9 is DC power supply in the machine among the figure, and it is responsible for, and each parts provides DC power supply in the machine.

In parallel with delay capacitor C can be a plurality of diodes, is placed on the diverse location of transformer, or the position of other need temperature control, so just can control the febrile state at each position simultaneously.

Of the present invention practicing can be improved the fail safe of pressurizer of delaying time greatly, thereby avoided many accidents that may take place.

Claims

1, one by input 1; output 2; sampling amplifier 3; action component 4; transformer 5; time-delay electric power system 6, the diode overload protection time-delay pressurizer that DC power supply 9 is formed, it is characterized in that two ends at the delay capacitor C of time-delay electric power system by the line reverse parallel connection one or more crystal diode D.

2, diode overload protection as claimed in claim 1 time-delay pressurizer is characterized in that the crystal diode that it is reverse with delay capacitor C by line and connect, and is to be placed between the iron core of transformer 5 and the coil or in the coil.