CN2043796U - Protector for voltage stabilizer with eight functions - Google Patents

Abstract

The utility model discloses a protector for the voltage stabilizer with eight functions which is an integrity protective device. The key section of the protector for the voltage stabilizer with eight functions is an integrated mould. The protector for the voltage stabilizer with eight functions can avoid the voltage too high or too low, stabilize the voltage in the permissive ranged of electric appliances, and have a momentary power failure protection for the refrigerator and a personal safety protection in a state of electric shock and electric leakage. The protector for the voltage stabilizer with eight functions can detect bad insulation, cut off the power in a state of short circuit or overloading for a short time, automatically recover the power after the failure and remind the user to be careful. The protector for the voltage stabilizer with eight functions can cut off the power in a state of over-voltage, and automatically recover the power when the over-voltage phenomenon is eliminated. The protector for the voltage stabilizer with eight functions can serially regulate the voltage in a compensating mode, the arranged transformer capacity is small, and the protector for the voltage stabilizer with eight functions doesn't have a momentary power failure when regulating and switching the voltage.

Description

Protector for voltage stabilizer with eight functions

Technical field of the present utility model, household appliance equipment.

Existing various daily high-grade electric equipments are general is deep into numerous families, voltage instability, generally all be offset very big, threatening the safety of household appliance, normal operation, get an electric shock, electric leakage happens occasionally, the refrigerator sudden power that is in operation is sent a telegram here, is slipped up and cause short circuit, carelessness to cause overload, external cause generation superpressure very soon again, these all are common, the phenomenon that should make every effort to avoid.The equipment that does not now have a kind of combination property, not only regulated output voltage but also can both protect to these improper phenomenons.Notification number GG86210013 patent (seeing utility model patent communique on October 14th, 1987); protection to refrigerator is not intact; produce protection when it can only be to overvoltage; when taking place, superpressure can not protect; obtain step-down with sealing in induction reactance; want a large amount of consume reactive power; reduce power factor; wasted the energy; in addition, under-voltage harm to refrigerator is equally very big, and under-voltage condition is more common; also lack momentary power failure protection, so the performance of protective device imperfection very.

The utility model is for solving the deficiency of 86210013 patents, improves that the protection of refrigerator and solution jeopardize the person, device security, burning voltage and the eight function voltage-stabilizing protection devices that design.

The utlity model has following eight functions:

1. deboost is too high, makes output voltage be no more than the ceiling voltage that electrical equipment allows.

2. deboost is low excessively, makes output voltage be not less than the minimum voltage that electrical equipment allows.

3. refrigerator momentary power failure protection, avoid refrigerator because of momentary power failure after, owing to heavy-load start causes damage.

4. electrical shock protection can be protected personal safety, avoids the injures and deaths of getting an electric shock.

5. earth leakage protective is in time found circuit, electric equipment defective insulation.

6. overcurrent (short circuit) protection avoids causing serious consequences such as fire.

7. overload protection prevents excess load.

8. overpressure protection avoids burning out electric equipment.

The utility model only uses an integrated package (four-operational amplifier) to handle after operational factor is sampled, and removes actuating relay through the triode power amplification, finishes above-mentioned functions.

Accompanying drawing is the utility model key wiring diagram.

The utility model can be decomposed into several parts, and its operation principle is as follows:

1. voltage stabilizing partly: supply voltage is through step-down, rectification, filtered voltage (representative supply voltage) and the reference voltage (representative rated voltage) after voltage stabilizing subtract each other, the absolute value of its difference characterizes the numerical value that supply voltage departs from rated voltage, and with this absolute difference and the reference voltage adjusted by operational amplifier 14, the voltage difference absolute value hysteresis loop comparator that constitutes, constantly compare, when difference absolute value during greater than setting value (supply voltage is higher or lower than design load), amplifier output is converted to high level, make relay 15 actions, voltage regulating transformer 4 is devoted oneself to work.The utility model adopts compensation series voltage-regulating, voltage regulating transformer is connected in the circuit (No. 86210013 patent series connection be inductance coil), major part in the power output is directly born by electrical network, the transformer that seals in is only born this part power that should compensate because of variation, so the transformer capacity that is provided with is very little, its capacity is no more than 20% of gross output can satisfy actual needs.When voltage drops to design load, carrying out homophase just compensates, make output voltage raise, when voltage is elevated to design load, the voltage hysteresis loop comparator output that amplifier constitutes is converted to high level, relay 17 actions, with the primary side paraphase of voltage regulating transformer, carry out anti-phase negative compensation, output voltage is reduced.Though the utility model switches with relay and carries out pressure regulation, but can momentary power failure in the relay handoff procedure yet, this is to guarantee relay 17 action earlier with the setting value of amplifier action and hysteresis amount, choosing operating state gets ready, then relay 15 just move, when returning relay 15 than relay 17 Zao actions, momentary power failure does not take place, and generally all adopt autotransformer, carry out pressure regulation with the relay switching, in handoff procedure, can produce momentary power failure.For avoiding frequent movement, the positive feedback by amplifier output obtains a certain amount of hysteresis.

2. refrigerator momentary power failure protection: the electrical network that is in operation has a power failure suddenly; at this moment; cold-producing medium in the compressor pressure piping has little time to discharge; pressure reduction does not disappear as yet; if very fast incoming call more again, compressor start under this heavy duty and just may burn out, and the effect of protective device is to delay time about 5 minutes; after treating that pressure reduction disappears, just recover automatically to send to refrigerator.When having a power failure, relay 10 discharges, and its normally closed contact discharges the capacitor 6 that has charged rapidly.When sending a telegram here again again after the power failure, relay 10 actions, by its normal opened contact, through 6 chargings of 5 pairs of capacitors of resistance, the voltage of capacitor raises gradually, punctures when the voltage of about 5 minutes capacitors of charging is elevated to voltage-stabiliser tube 8, makes triode 18 conductings, relay 9 recovers refrigerator is powered with regard to adhesive.Existing various refrigerator protectors; no matter charge type or discharge-type all are directly to take the RC time constant; obtain the long delay of a few minutes; so capacitance is all very big; and the utility model utilizes the amplification of a little triode 7; obtain bigger equivalent capacity with less electric capacity; its timeconstant=RC (1+ β); capacitor volume can reduce β doubly (more than tens times), and this has just been avoided adopting the disadvantage of big electrolytic capacitor.During refrigerator momentary power failure protection action, light-emitting diode 19 ignites.

3. get an electric shock, earth leakage protective: when normal operation, zero sequence current mutual inductor 3 primary side current vectors and be zero, secondary side is no current also.When get an electric shock, when leaking electricity, primary side current is shunted over the ground, make primary side current vector and non-vanishing, secondary side also will induce electric current, and this zero-sequence current is converted to voltage, be compared by the voltage comparator that amplifier constitutes with reference voltage, when this magnitude of voltage surpasses the reference voltage of adjusting, operational amplifier output is converted to high level, and relay 10 is discharged immediately, cuts off the electricity supply.For safety, electric shock, earth leakage protective action back amplifier can restore electricity just will click reset button 16 by the positive feedback self-sustaining.Because personal safety is very important, so be provided with the test loop, at any time the reliability of hookup, prevent trouble before it happens, clicking test button 1 simulation electric shock, electric leakage, relay 10 have taken place should move immediately, cut off the electricity supply, click reset button 16 again and just can restore electricity.

4. overcurrent (short circuit) protection: when causing short circuit accidentally, electric current will strengthen several times than normal value, will lead to grave consequences as not cutting off the electricity supply immediately.By current transformer 2 this magnitude of current is converted to voltage, compare by the voltage comparator that amplifier constitutes with reference voltage, when this voltage reaches setting value, the output of operational amplifier is converted to high level, and by the positive feedback self-sustaining, relay 10 is discharged immediately, cut off the electricity supply, this moment, light-emitting diode 11 ignited.After treating unshorting, click reset button 16 relay 10 adhesives again, restore electricity.

5. overload (overload) protection: when the load that comes into operation too many; when surpassing the power of adjusting; the voltage of this load current conversion is through 13 chargings of 12 pairs of capacitors of resistance; after certain charging time-delay; voltage on the capacitor is charged to setting value; the voltage comparator that constitutes through operational amplifier carries out voltage ratio; output is converted to high level; relay 10 is discharged; cut off the electricity supply, remind owner now to overload, should reduce load; after passing through capacitance-resistance positive feedback self-sustaining certain time-delay again, automatic recovery of power supply again.It is for avoiding impact acceleration (as the refrigerator starting) in short-term, producing malfunction that action delay is set.When cutting off the electricity supply, the protection action of refrigerator momentary power failure, relay 9 excises off-load with refrigerator.

6. power supply overpressure protection: when power supply broken neutral line or neutral line impedance too high and produce the neutral point displacement; because mis-wired; connect is two phase firewires and some external cause; can both make the voltage superelevation (above-mentioned reason causes that superpressure burns out household electrical appliance, happens occasionally) of input.The GG86210013 patent can not be to overpressure protection.The utility model can be to overpressure protection, and voltage-stabiliser tube 20 punctures when superpressure, makes relay 21 actions, and its normally closed contact disconnects power supply is excised.Eliminate when superpressure, voltage recovers just often, again can automatic recovery of power supply.

The utility model circuit is simple, reliable, cost is low, the functional price ratio is high; places such as family, restaurant, shop; as long as possess a playscript with stage directions equipment, but not only burning voltage but also can realize general protection is protected personal device security.

Accompanying drawing is embodiment of the present utility model.

Claims (4)

1. energy regulated output voltage, can to the protection of refrigerator momentary power failure, can be to getting an electric shock earth leakage protective.Can be to overcurrent; overload protection; can be to the multi-functional voltage-stabilizing protection device of overpressure protection; it is characterized in that forming by voltage regulating transformer, input processing and final controlling element; the voltage regulating transformer of doing the bucking voltage skew is connected in the circuit, and its capacity is no more than 20% of gross output.

2. according to the described protector of claim 1; it is characterized in that input processing and final controlling element are by a four-operational amplifier; peripheral circuit and relay are formed; amplifier in the four-operational amplifier and peripheral circuit constitute the voltage difference absolute value hysteresis loop comparator whether the control voltage regulating transformer devotes oneself to work; two amplifiers in the four-operational amplifier and peripheral circuit constitute and get an electric shock; electric leakage; the self-sustaining voltage comparator that overcurrent protection and overload protection are used; another amplifier in the four-operational amplifier is made the control voltage hysteresis loop comparator that voltage regulating transformer boosts or step-down is used.

3. according to the described protector of claim 2; it is characterized in that input is handled and final controlling element can momentary power failure in the series voltage-regulating handoff procedure; the relay that the decision voltage regulating transformer is devoted oneself to work; setting value and hysteresis amount with the amplifier action guarantee to be later than the relay that working method (ascending, descending pressure) actuating of relay is just moved afterwards, voltage regulating transformer is deactivated, early than action earlier before the working method actuating of relay.

4. according to the described protector of claim 1, it is characterized in that doing electric capacity that the protection of refrigerator momentary power failure obtains time-delay usefulness and be the equivalent capacity after triode amplifies.