CN2279027Y

CN2279027Y - Automatic power supply lighting shock and leakage protector

Info

Publication number: CN2279027Y
Application number: CN 96245481
Authority: CN
Inventors: 叶林
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-11-05
Filing date: 1996-11-05
Publication date: 1998-04-15
Anticipated expiration: 2006-11-05

Abstract

The utility model relates to an automatic controller for lighting strike and electricity leakage of a power supply. The utility model mainly adopts a zinc oxide pressure sensitive element to form triple protection; a first protection is formed by connecting a BL< 1 > and a power supply in parallel; a second protection is formed by a BL < 2 > and inductors L < 1 > and L < 2 >; a third protection is formed by connecting a B < 3 > and an R < 2 > in series; the utility model is also provided with an action loop composed of a relay J and controllable silicon. Thus, the utility model has the advantages of simple structure, convenient and reliable use, high strength of lightning strike prevention, high response speed of overvoltage protection, multifunction, etc.

Description

Power supply thunderbolt electric leakage automatic protector

The utility model relates to a kind of automatic safety device of electronic electric equipment power supply.

It is a kind of common phenomenon that electronic electric equipment suffers thunderbolt, lose also more serious, all departments, each system, each producer are also all being prevented by every means, resemble the zinc oxide arrester that adopts in the electric power system electrical network, be connected in parallel on the electrical network exactly, utilize the good residual voltage characteristic of zinc oxide arrester, weaken the infringement that thunderbolt brings.Adopt this kind mode lightning-arrest; because the voltage that starts to control of zinc oxide is difficult to the selection of platform reason; when selecting to start to control overtension; be difficult to electric equipment is protected; selected low when starting to control voltage; be difficult to guarantee the safety of oneself, and do not shield to long residual voltage of duration or less than the overvoltage of starting to control voltage.The earth leakage protective device that present family generally adopts; though high-grade any have an overvoltage protection effect; but the overvoltage of this kind overvoltage protector detects response action operating voltage and directly takes in the mode of overvoltage, and when overvoltage surpasses certain limit, the circuit of itself just will damage.This protector only is applicable to overvoltage protection among a small circle; can not be suitable for super large scope overvoltage protection for thunder and lightning or 380 volts of misphases; and some power supply thunderbolt privacy protection equipment on the market; only moment thunderbolt pulse is shielded; the discharge pulse that is surpassed millisecond the duration does not shield; as work and also just in protector, establish fuse, protect electric equipment with the mode of blowing fuse.This has increased the user in actual use and has changed the trouble that same model fuses; the fuse (fuse) that often causes the user to change not to be inconsistent specification requirement and make protector ineffective; resemble such lightning protection and must bury the high standard ground wire underground, increased user's investment and trouble.

The purpose of this utility model is that design at the deficiency in the above overvoltage protection measure a kind of is applicable to power supply thunderbolt electric leakage automatic protector on the electric equipment that adopts mains-supplied.

The purpose of this utility model is finished by following technical solution; it includes the device shell; the overvoltage of forming on circuit board with electric component in the device shell and the two groups of protective circuits of leaking electricity, wherein overvoltage crowbar is by the zinc oxide pressure-sensitive element BL on the parallel connection power supply input successively ₁And BL ₂And the inductance L of connecting on the circuit between them ₁And L ₂Form, thereby constituted BL ₁And BL ₂Duplicate protection, promptly high-frequency and high-voltage intercepts protective circuit.

Described leakage protection circuit is the induction coil L that respectively connecting at power supply input two ends ₃And L ₄And the magnet ring L that cooperates with it, this magnet ring L connects the trigger end with controllable silicon G after rectification circuit connects, and controllable silicon G connects with relay J, and its contact switch JK ₁Be connected on and formed action circuit in the electric power loop.

The utility model is at described induction coil L ₃And L ₄Two-end-point each the series connection be connected to by zinc oxide pressure-sensitive element BL ₃And resistance R ₂The loop inductance of series connection has constituted overvoltage triple protection circuit thus.

Also can be parallel with by K switch resistance R at the two ends of above-mentioned loop inductance ₁And capacitor C ₁The testing circuit of series connection, but the reliability of timely checking circuit.

The utility model also is provided with the time-delay circuit of resuming work automatically, and it is to be connected to energy storage capacitor C in action circuit respectively ₂With relay switch JK ₂And JK ₃Form.

Description of drawings is as follows:

Fig. 1 is circuit theory diagrams of the present utility model.

Fig. 2 is the circuit theory diagrams of another embodiment of the utility model.

Below will the utility model is further introduced by accompanying drawing: the utility model mainly contains the device shell, the circuit board in the device shell and be fixedly mounted on electric component on the circuit board.Described electric component has constituted overvoltage, leakage protection circuit as shown in Figure 1.Among the figure, select to start to control higher (1500 volts) the zinc oxide pressure-sensitive element BL of voltage ₁(residual voltage is 3000 volts) is connected in parallel on power supply input two ends, formed the first heavy overvoltage protection, and it can guarantee self safety to bigger thunderbolt, can guarantee the safety of back operating circuit again, and the requirement of withstand voltage that makes the back circuit is less than 3000 volts.Difference series inductance L in the circuit after the above-mentioned first heavy overvoltage crowbar ₁And L ₂, and then be parallel with zinc oxide pressure-sensitive element BL ₂, (start to control 750 volts of voltages, residual voltage is 1500 volts) is because inductance L ₁And L ₂/ can not suddenly change zinc oxide pressure-sensitive element BL in addition ₂Good current is arranged, and they have formed the second heavily protection, less than 3000 volts, intercept outside greater than 1500 volts lightening pulses.

In the power supply fan-in network, also be in series with induction coil L separately ₃And L ₄And corresponding configuration has reaction magnetic ring L, connects the trigger end with controllable silicon G on this reaction magnetic ring L behind rectification circuit, and this controllable silicon G and relay J have been composed in series actuating circuit, and relay contact switch is connected on and plays the deenergization effect in the electric power loop.Induction coil L ₃And L ₄Cooperate with reaction magnetic ring L and to have constituted leakage circuit.At induction coil L ₃And L ₄Two-end-point be connected in parallel by zinc oxide pressure-sensitive element BL ₃And resistance R ₂The detection loop of series connection, this detection loop has constituted triple protection with actuating circuit, i.e. the overvoltage protection of longer duration.When overvoltage, Zinc-oxide piezoresistor starts to control, and makes to flow through L ₃, L ₄Electric current produce error, when error amount during greater than 30mA, the induced voltage that magnet ring L produces can trigger the conducting of controllable silicon G, makes actuating circuit work, R ₂Be protective resistance, guarantee BL ₃Safety.By BL ₃, R ₂The circuit that magnet ring L forms makes the work of overvoltage actuating circuit, relay switch JK ₁Disconnect the contact of cutting off civil power and equipment, 260 volts of above induction residual voltages that surpassed Millisecond the duration play cutting action.

The utility model also is parallel with by K switch at the two ends of testing circuit, resistance R ₁And capacitor C ₁The testing circuit of series connection can regularly detect the reliability of this circuit.On action circuit, also be in series with by transformer B and rectification circuit D ₁-D ₄The current supply circuit of forming, for relay J provides reliable operating voltage, the trouble free service of safety action circuit.

Another embodiment of the present utility model as shown in Figure 2, it has increased delayed recovery circuit.It is to have set up energy storage capacitor C in the overvoltage actuating circuit ₂, relay normally open contact JK ₂And JK ₃, when power supply source just often, transformer B after rectification to capacitor C ₂Charging when actuating circuit is worked, utilizes energy storage capacitor C ₂Rechargeable energy, keep relay J work, and relay normally open contact JK ₂Be connected on the control board of controllable silicon G.When actuating circuit was worked, the control that can guarantee controllable silicon G is zero potential very, eliminated the relay J misoperation that the back has residual voltage to produce because of the controllable silicon G control utmost point that resets, and JK ₃For path over the ground is provided after the actuating of relay.The other parts of present embodiment are identical with preceding embodiment.

The utility model is owing to adopted the zinc oxide pressure-sensitive element as the overvoltage protecting component and be provided with multiple protective Circuit, thus make the utlity model has simple in structure, use reliably conveniently, need not bury ground wire underground, anti-Thunderbolt intensity is big, and the fast response time of overvoltage protection is effective, can not produce harm to using electricity system, simultaneously Also has the load electric leakage, the characteristics of the action such as contact protection.

Claims

1, a kind of power supply thunderbolt electric leakage automatic protector; it includes the device shell; the overvoltage that constitutes on circuit board with electric component in the device shell and two groups of protective circuits of electric leakage is characterized in that described overvoltage crowbar is by successively and be connected in power supply and import zinc oxide pressure-sensitive element BL on the two ends ₁And BL ₂And the inductance L of connecting on the circuit between them ₁And L ₂Form.

2, power supply thunderbolt electric leakage automatic protector as claimed in claim 1 is characterized in that described leakage protection circuit is the induction coil L that is respectively being connected by the two ends of power supply input ₃And L ₄And the magnet ring L that matches forms, and connects the trigger end with controllable silicon G behind rectification circuit, and this controllable silicon G connects with relay J and relay contact switch is connected on and has formed action circuit in the electric power loop.

3, power supply thunderbolt electric leakage automatic protector as claimed in claim 2 is characterized in that described induction coil L ₃And L ₄Two-end-point each the series connection be connected to by zinc oxide pressure-sensitive element BL ₃And resistance R ₂The detection loop of series connection.

4, power supply thunderbolt electric leakage automatic protector as claimed in claim 3 is characterized in that the two-end-point in described detection loop is parallel with by K switch resistance R ₁And capacitor C ₁The hookup of series connection.

5, as claim 2 or 3 or 4 described power supply thunderbolt electric leakage automatic protectors, it is characterized in that being connected to respectively in the described action circuit energy storage capacitor C ₂With relay switch JK ₂And JK ₃, and constituted the time-delay circuit of resuming work automatically by them.