CN201247945Y - Over-voltage protection device - Google Patents
Over-voltage protection device Download PDFInfo
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- CN201247945Y CN201247945Y CNU2008200515898U CN200820051589U CN201247945Y CN 201247945 Y CN201247945 Y CN 201247945Y CN U2008200515898 U CNU2008200515898 U CN U2008200515898U CN 200820051589 U CN200820051589 U CN 200820051589U CN 201247945 Y CN201247945 Y CN 201247945Y
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- switching device
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- relay
- overvoltage protection
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Abstract
The utility model relates to an over-voltage protection device which comprises a detection control device and switching devices, wherein the switching devices are connected in series between commercial power and a protected electrical appliance; the detection control device comprises a power supply loop, a voltage detection loop, a comparison control loop and a switching device driving circuit; the power supply loop supplies power to the detection control device; the voltage detection loop detects the commercial power and outputs detection results to the comparison control loop; the switching device driving circuit controls the switching on or the switching off of the switching devices connected with the switching device driving circuit according to control signals outputted by the comparison control loop; the power supply loop comprises a transformer and a voltage regulation apparatus arranged on the output end of the transformer; the input end of the transformer is connected with the middle line and a phase line of the commercial power; and the output end of the voltage regulation apparatus is connected with the loop of the detection control device. The voltage and the current of the power supply of the detection control device are stable, can guarantee that the protection device controls the correctness and the stability of action, and also improve the capacity of resisting disturbance of the protection device.
Description
Technical field
The utility model relates to a kind of overvoltage protection.
Background technology
Existing overvoltage protection, the device its own power source is generally directly passed through electric resistance partial pressure from electric main, perhaps obtains from the storage battery of other configuration.Directly the supply voltage that obtains by electric resistance partial pressure is stable inadequately, can not provide bigger electric current for overvoltage protection; And adopt storage battery to do supply voltage, and then needing often to change battery, practical application is convenient inadequately.
In addition, existing overvoltage protection is merely able to provide overvoltage protection for an electrical circuit; And generally adopt normality disconnection type relay to drive the closed or disconnection of the switching device that is connected between electric main and the protected electrical equipment, therefore when overvoltage protection self control loop was damaged, protected electrical equipment was with cisco unity malfunction.
The utility model content
The technical problems to be solved in the utility model is to provide a kind of supply voltage stable overvoltage protection.
In order to solve the problems of the technologies described above, the utility model adopts following technical scheme: overvoltage protection, comprise detection control apparatus and switching device, and wherein switching device is connected between civil power and the protected electrical equipment; Detection control apparatus comprises electric power loop, the voltage detecting loop, compare control loop, the switching device drive circuit, wherein electric power loop is given the detection control apparatus loop power supply, the voltage detecting loop is detected civil power and is exported testing result to the comparison control loop, the switching device drive circuit is controlled connected switching device disconnection or closed according to the control signal of relatively control loop output, it is characterized in that: described electric power loop comprises transformer and is located at the voltage-stabilizing device of transformer output, wherein the input of transformer is connected with the center line and a phase line of civil power, and the output of voltage-stabilizing device is connected with the detection control apparatus loop.Electric power loop of the present utility model uses transformer and voltage-stabilizing device design, provides stable power to device.
Described switching device and switching device drive circuit have more than 2 or 2, each switching device be connected on civil power and-individual protected electrical equipment between, and connect one to one with the switching device drive circuit.Thereby the utility model can provide overvoltage protection for 2 or 2 above electrical equipment.
Described detection control apparatus further comprises 2 or 2 above timing circuits, and each timing circuit is connected between comparison control loop and the switching device drive circuit, and delay time is unequal.Be arranged to the delay time of timing circuit unequal, can make from the time that the triggering signal of relatively control loop output acts on the different switching device drive circuits and stagger, be connected on switching device on the different electrical equipment reverts to conducting state from off-state time thereby stagger, avoid a plurality of switching devices to cause bigger noise to electrical network, disturb the stability of line voltage from the mutation current that off-state reverts to conducting state moment generation stack.
Further, described switching device drive circuit comprises relay and relay control circuit, and relay control circuit drives the relay control switch device under the triggering of the control signal that compares control loop output.Wherein the preferred normality closo of the relay relay in the switching device drive circuit has only when the voltage of civil power meets or exceeds the operation voltage of relay, and relay just can move, thereby disconnects being connected of protected circuit and civil power; When the control loop of detection control apparatus self was impaired, normality closo relay still can keep protected circuit and civil power to connect.
The utility model compared with prior art, the supply voltage of detection control apparatus and current stabilization can guarantee correctness, the stability of protective device control action, have also improved the antijamming capability of protective device.
Description of drawings
Fig. 1 is the structural representation of an electrical equipment of protection of the present utility model;
Fig. 2 is the circuit block diagram of at least 2 electrical equipment of protection of the present utility model;
Fig. 3 is the workflow diagram of circuit block diagram shown in Figure 2;
Fig. 4 is the circuit diagram of technical scheme shown in Figure 2 when adopting the three-phase alternating current civil power;
Fig. 5 is the circuit diagram of technical scheme shown in Figure 2 when adopting the single phase alternating current (A.C.) civil power.
Embodiment
As shown in Figure 1, 2, the utility model comprises detection control apparatus 10 and switching device 20, and wherein switching device 20 adopts normality disconnect type relay, is connected between civil power and the protected electrical equipment.Detection control apparatus 10 comprises electric power loop 30, voltage detecting loop 40, compares control loop 50 and switching device drive circuit 60.Wherein electric power loop 30 comprises transformer 302 and is located at the voltage-stabilizing device 301 of transformer output, and the input of transformer is connected with the center line of civil power and a phase line, and voltage-stabilizing device 301 output stabilized voltage power supplys are given the detection control apparatus loop power supply; Switching device drive circuit 60 comprises relay 602 and relay control circuit 601, and in the present embodiment, the relay of switching device drive circuit 60 is little current relay 602.Voltage detecting loop 40 is detected line voltage and is exported testing result to comparison control loop 50, relatively control loop 50 is exported comparative result as control signal according to testing result, and this control signal transferred to relay control circuit 601, relay control circuit 601 drives little current relay 602 control switch devices 20 and disconnects or closure under the triggering of this control signal.
As shown in Figure 2, detection control apparatus 10 of the present utility model is a plurality of electrical equipment of drive controlling simultaneously, and switching device drive circuit 60 has more than 2 or 2 accordingly.Between each protected electrical equipment and civil power, correspondingly be provided with a normality disconnect type relay, and each normality disconnect type relay is all by 60 controls of a switching device drive circuit as switching device 20; In the present embodiment, the relay in the switching device 20 is a normality disconnect type high-current relay.For avoiding a plurality of switching devices 20 to revert to the mutation current of the moment generation stack of conducting state simultaneously from off-state, detection control apparatus 10 of the present utility model further comprises at least one timing circuit 70.Each timing circuit 70 is connected between comparison control loop 50 and the switching device drive circuit 60, and delay time is unequal; When relatively control loop 50 is exported control signals, different switching device drive circuit 60 actual reception arrive the time of this control signal with inconsistent, thereby make the switching device 20 that is driven by it control revert to the asynchronism(-nization) of closing from disconnection, avoid the generation of electrical network mutation current, improved the stability of line voltage.
Fig. 4 realizes the circuit diagram of technical scheme shown in Figure 2 when adopting the three-phase alternating current civil power, wherein comparator IC4, IC5 and with door IC2 ratio of components than control loop 50, each timing circuit 70 is made up of 555 timers and peripheral cell thereof.L1-N from the three-phase alternating current civil power introduces AC power supplies, the power supply of acquisition device itself after process transformer T01 and voltage-stabilizing device IC7, the IC6 voltage stabilizing.Because the only corresponding high voltage part of transformer T01, and the transformation scope of design of transformer is certain, the design of transformer scope is ignored low-pressure section in the utility model, thereby is the design of transformer of small size the die mould of anti-the superelevation easily, makes the anti-superhigh pressure of detection control apparatus 10 itself; In the present embodiment, transformer T01 withstand voltage is 418V, and detection control apparatus 10 normal working voltage scopes are between 0-418V.Preferably, the little current relay 602 in the switching device drive circuit 60 adopts normality closo relay, when this breaks down with regard to the control loop that makes detection control apparatus 10, still can give protected electric power supply, and electrical equipment can temporarily be worked.
Fig. 3 is the workflow diagram of circuit diagram shown in Figure 4.The line voltage of phase line L1, L2, L3 detects through behind the electric resistance partial pressure, again through comparator IC4, IC5 output line voltage and the normal voltage signal after relatively, comparison signal is through exporting control signal with door IC2, and control signal is through a plurality of timing circuit IC8, IC9... (time of delay, T can select 10S, 15S...) control switch device drive circuit 60.When line voltage is too high switching device is disconnected after; when 40 detected line voltages reenter in the safety value scope in the voltage detecting loop; relatively control loop 50 will be exported control signal; delay time after the corresponding time; be connected on switching device 20 closures of phase line by the control of the little current relay in the switching device drive circuit 60, reclose being connected of protected electrical equipment and civil power.Specifically, the groundwork flow process of Fig. 4 is as follows:
S1, detection control apparatus 10 obtains working power by electric power loop 30 from the three-phase mains, gives electric power loop 30, voltage detecting loop 40, relatively control loop 50, switching device drive circuit 60, timing circuit 70 power supplies;
S2, starting working under the power supply of electric power loop 30 in voltage detecting loop 40, detects the voltage of electric main, and testing result is outputed to comparison control loop 50;
S3, relatively control loop 50 compares testing result and normal voltage, judges whether the magnitude of voltage of electric main has entered protection range:
(1) when voltage enters protection range, Fig. 4 operating state changes step S4 over to, comparison control circuit 50 output low level signals; Change step S5 subsequently over to, timing circuit 70 output high level signals, relatively the control signal of control loop 50 is not delayed time; Disconnect at the medium and small current relay 602 of step S6; Enter among the step S7 control high-current relay at last and disconnect, thereby turn-off being connected of power consumption equipment and electric main, protect power consumption equipment to avoid high-tension damage.
(2) when voltage does not enter protection range, Fig. 4 operating state changes step S8 over to, comparison control circuit 50 output high level signals; Change step S9 subsequently over to, timing circuit 70 output low level signals, the control signal of comparison control loop 50 is delayed time after the corresponding time T; In medium and small current relay 602 conductings of step S10; Enter control high-current relay closure among the step S11 at last, the connection power consumption equipment is connected with electric main, and power consumption equipment is reworked.
Fig. 5 is when adopting the single phase alternating current (A.C.) civil power, realizes the circuit diagram of technical scheme shown in Figure 2.The difference of Fig. 5 and Fig. 4 only is to be reduced by phase line, and makes the voltage detecting loop only have one group, and comparator only adopts IC4; Their operation principle and flow process are identical, so do not give unnecessary details.
Claims (9)
1. overvoltage protection comprises detection control apparatus (10) and switching device (20), and wherein switching device (20) is connected between civil power and the protected electrical equipment; Detection control apparatus (10) comprises electric power loop (30), voltage detecting loop (40), compare control loop (50), switching device drive circuit (60), wherein electric power loop (30) is given the detection control apparatus loop power supply, voltage detecting loop (40) is detected civil power and is exported testing result to comparison control loop (50), switching device drive circuit (60) is controlled connected switching device (20) disconnection or closed according to the control signal of relatively control loop (50) output, it is characterized in that: described electric power loop (30) comprises transformer (302) and is located at the voltage-stabilizing device (301) of transformer output, wherein the input of transformer (302) is connected with the center line and a phase line of civil power, and the output of voltage-stabilizing device (301) is connected with the detection control apparatus loop.
2. overvoltage protection according to claim 1; it is characterized in that: described switching device (20) and switching device drive circuit (60) have more than 2 or 2; each switching device (20) is connected between civil power and the protected electrical equipment, and connects one to one with switching device drive circuit (60).
3. overvoltage protection according to claim 2; it is characterized in that: described detection control apparatus (10) further comprises 2 or 2 above timing circuits (70); each timing circuit (70) is connected between comparison control loop (50) and the switching device drive circuit (60), and delay time is unequal.
4. according to the described overvoltage protection of arbitrary claim in the claim 1 to 3; it is characterized in that: described switching device drive circuit (60) comprises relay (602) and relay control circuit (601); relay control circuit (601) drives relay (602) control switch device (20) under the triggering of the control signal that compares control loop (40) output.
5. overvoltage protection according to claim 4 is characterized in that: described relay (602) is a normality closo relay.
6. overvoltage protection according to claim 1 and 2 is characterized in that: described civil power is the three-phase alternating current civil power, or the single phase alternating current (A.C.) civil power.
7. overvoltage protection according to claim 1 and 2 is characterized in that: described switching device (20) is a normality disconnect type relay.
8. overvoltage protection according to claim 1 and 2 is characterized in that: described relatively control loop (50) comprise the voltage comparator that is in series and with door.
9. overvoltage protection according to claim 1 is characterized in that: described transformer (302) is high withstand voltage type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200515898U CN201247945Y (en) | 2008-07-31 | 2008-07-31 | Over-voltage protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200515898U CN201247945Y (en) | 2008-07-31 | 2008-07-31 | Over-voltage protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201247945Y true CN201247945Y (en) | 2009-05-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200515898U Expired - Lifetime CN201247945Y (en) | 2008-07-31 | 2008-07-31 | Over-voltage protection device |
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| Country | Link |
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| CN (1) | CN201247945Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105006959A (en) * | 2015-07-27 | 2015-10-28 | 上海沪工焊接集团股份有限公司 | Inversion power supply slow-start control circuit and control method |
| CN107591281A (en) * | 2017-09-04 | 2018-01-16 | 珠海格力电器股份有限公司 | Relay voltage reduction maintaining control circuit and control method |
-
2008
- 2008-07-31 CN CNU2008200515898U patent/CN201247945Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105006959A (en) * | 2015-07-27 | 2015-10-28 | 上海沪工焊接集团股份有限公司 | Inversion power supply slow-start control circuit and control method |
| CN107591281A (en) * | 2017-09-04 | 2018-01-16 | 珠海格力电器股份有限公司 | Relay voltage reduction maintaining control circuit and control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090527 |