CN201413980Y - Alternating current over-voltage protection device - Google Patents
Alternating current over-voltage protection device Download PDFInfo
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- CN201413980Y CN201413980Y CN2009200572414U CN200920057241U CN201413980Y CN 201413980 Y CN201413980 Y CN 201413980Y CN 2009200572414 U CN2009200572414 U CN 2009200572414U CN 200920057241 U CN200920057241 U CN 200920057241U CN 201413980 Y CN201413980 Y CN 201413980Y
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- overvoltage protection
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Abstract
The utility model belongs to the technical field of electrical apparatuses, particularly disclosing an alternating current over-voltage protection device which comprises a power circuit, an over-voltage protection control element and a micro control unit MCU, wherein the over-voltage protection control element is connected to a loop of the power circuit, and the micro control unit MCU is connectedwith the output end of the power circuit and each loop of a protected electrical apparatus. The alternating current over-voltage protection device has stable power voltage, resists high voltage, canensure the correctness and the stability of the movement of the device, can better fulfill a function of timely protection during abnormal voltage because of wide high voltage protection range thereof, in addition, has simple structure and small volume, can be directly designed on a circuit board of the protected electrical apparatus, and can be in mass production without needing to change a program, thereby having low manufacture cost.
Description
Technical field
The utility model relates to a kind of overvoltage protection, the AC overvoltage protection device of using in particularly a kind of technical field of electricity.
Background technology
At present, need increase by an over-pressure safety device in addition,, the normal operation of whole appliance circuit be protected when the input ac voltage in the external world has when unusual in the air-conditioning product technical field.In addition; also needing to consider that power supply low pressure is crossed when considering overvoltage protection also needs to protect when low; so withstand voltage scope of high pressure of having dwindled transformer; promptly reduced the protection range of the high pressure of protective device; the overall volume of transformer is bigger; make whole over-pressure safety device volume also more greatly, special space need be set place.In addition, used comparison circuit comprises multiple components and parts such as voltage stabilizing IC, its loop complexity, failure rate height, maintenance cost height in the existing protective device.
In addition, the source mode of existing over-pressure safety device its own power source is divided into following several.First kind: the protective device its own power source directly obtains through the divider resistance dividing potential drop from civil power, if the problem that this mode exists is the supply voltage instability of protective device itself, certainly will the voltage of whole air-conditioning current supply circuit be impacted.Second kind: the power supply of protective device obtains from the storage battery that self is provided with, and the power supply of this protected mode needs to obtain in addition, the battery altering trouble, and along with the increase of time, the voltage of storage battery can descend, and certain restriction is also arranged its useful life.
The utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art; a kind of interchange over-pressure safety device is provided; this supply voltage that exchanges over-pressure safety device is stable, correctness, the stability of the action of energy assurance device, and its high voltage protective scope is big; can better play a protective role; it is simple in structure in addition, and volume is little, directly can be designed on the circuit board; not needing alters the procedure promptly can be mass-produced, cheap for manufacturing cost.
In order to realize above-mentioned technical purpose, the utility model is realized by following technical scheme:
A kind of AC overvoltage protection device described in the utility model; comprise: power circuit, the micro-control unit that is connected the overvoltage protection control element on the power circuit loop and links to each other with power circuit output end, described micro-control unit MCU is connected with at least a portion electric loop in the protected electrical equipment.
Specifically, described power circuit comprises linear transformer, bridge rectifier loop, 12V voltage stabilizing circuit and the 5V voltage stabilizing circuit composition that is arranged on the protected appliance circuit plate, and described micro-control unit MCU is connected the output of 5V voltage stabilizing circuit.Certainly, described micro-control unit MCU also can be connected the output of 12V voltage stabilizing circuit by actual needs.
Further improvement as above-mentioned technology; described overvoltage protection control element is the protection actuating relay; described protection actuating relay is connected between bridge rectifier loop and the 12V voltage stabilizing circuit, relatively the operating voltage V1 of dc voltage NR after the rectification and protection actuating relay and the size of open voltage V2 thereof.Under the normal voltage state, relay is in the ON state, and when AC power supplies voltage increased, the magnitude of voltage of NR also increased thereupon, when NR=V1, and relay OFF, electric power loop disconnects; When AC power supplies voltage reduced, the magnitude of voltage of NR also reduced thereupon, and when V2＜NR＜V1, relay is in the OFF state; When NR=V2, whole electric power loop is switched on again, and each loop of protected electrical equipment is connected and will turns round with the state before stopping.
In addition, in order to obtain direct voltage, also be connected with between described bridge rectifier loop and the protection actuating relay and make output voltage smoothly be the smoothing capacity of direct voltage.
At least a portion electric loop of protected electrical equipment comprises compressor of air conditioner and peripheral loop, outer motor and peripheral loop, inner motor and peripheral loop and cross valve and the peripheral loop that links to each other by relay with the chip pin of micro-control unit MCU in the utility model.By overvoltage protection effect to each AC components and parts of air-conditioning equipment, promptly whole air-conditioning product played omnibearing overvoltage protection, its protection range is wide, can protect immediately, and overvoltage protection is effective, has prolonged the useful life of electric equipments such as air-conditioning effectively.
Compared with prior art, the beneficial effects of the utility model are:
(1) power supply of the utility model AC overvoltage protection device is directly to be provided by the transformer on the circuit board of protected electrical equipment, make that the power supply of protective device is stable, and and the power supply of protected electric equipment is synchronous, owing to the transformer in the circuit board that utilizes protected electrical equipment, though the only corresponding high voltage part of transformer, and the transformation scope of design is certain, but when the alternating voltage of input surpasses the protection magnitude of voltage of this device setting, because the loop of Circuit Fault on Secondary Transformer disconnects, the Circuit Fault on Secondary Transformer load will become very little, the temperature of transformer is reduced, so the anti-superhigh pressure of protective device itself;
(2) over-pressure safety device its own power source described in the utility model directly is that circuit board from tested electric equipment obtains, so it obtains fairly simple;
(3) the high voltage protective scope of over-pressure safety device described in the utility model is big, applied widely;
When (4) interchange over-pressure safety device described in the utility model was in voltage drops to safe range, protected electric equipment will remain in operation according to the operating condition before protected, does not influence the normal operation of protected electric equipment;
(5) a protection actuating relay is set up in utilization in the utility model on electric power loop, by comparing bridge rectifier output voltage loop and the size of protecting actuating relay operating voltage and open voltage, come the break-make of real-time realization electric power loop, utilize ON, OFF operation voltage and the open voltage of protection actuating relay to realize protective effect, thereby play better the protection each electrical circuit in each equipment can in the safe voltage scope, work, it is simple in structure, can play the purpose of timely protection;
(6) interchange overprotection device components and parts of the present utility model are few, just in original electric power loop, increase by a protection actuating relay, make that the device overall volume is less, need not to establish in addition special space and deposit, it simply directly is designed on the circuit board simultaneously, produces in enormous quantities easily;
(7) interchange over-pressure safety device cost of manufacture of the present utility model is cheap, and material purchases are convenient and swift.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in detail:
Fig. 1 is the basic circuit diagram of interchange over-pressure safety device described in the utility model;
Fig. 2 is the operational flowchart of interchange over-pressure safety device described in the utility model;
Fig. 3 is the performance plot of protection actuating relay in the utility model.
Embodiment
As shown in Figure 1, AC overvoltage protection device described in the utility model comprises: power circuit, the micro-control unit MCU that is connected the overvoltage protection control element 1 on the power circuit loop and links to each other with power circuit.Described micro-control unit MCU is connected with at least a portion electric loop in the protected electrical equipment.
In the utility model, power circuit comprises linear transformer T1, bridge rectifier loop DB01,12V voltage stabilizing circuit and the 5V voltage stabilizing circuit composition that is set directly on the protected appliance circuit plate, and the input of described micro-control unit MCU is connected the output of 5V voltage stabilizing circuit; Certainly, also can the input of micro-control unit MCU be connected the output of 12V voltage stabilizing circuit by actual needs.
In order better the AC power of exporting in the power circuit to be carried out monitoring; the overvoltage protection control element 1 that adopts in the utility model is protection actuating relay RY-1; this protection actuating relay RY-1 specifically is connected between bridge rectifier loop DB01 and the 12V voltage stabilizing circuit; utilize the characteristic of protection actuating relay RY-1; when the power supply high voltage occurring, immediately the deenergization loop, protected electrical equipment is quit work.Simultaneously, obtain direct voltage in order to make rectification, described bridge rectifier loop and protection also are connected with between the actuating relay and make output voltage smoothly be the smoothing capacity C1 of direct voltage.
For the various electric equipments in the better protection air-conditioning product; the electric loop of the protected electrical equipment in the utility model specifically comprises compressor and peripheral loop, outer motor and peripheral loop, inner motor and peripheral loop, reaches cross valve and peripheral loop etc., and these electric loops link to each other with corresponding output pin among the micro-control unit MCU by relay.
As shown in Figure 1, each protects electric equipment to introduce supply voltage from single phase poaer supply L-N, through the dc voltage NR that needing to obtain behind transformer T1 and the bridge rectifier loop DB01.In certain load range, dc voltage V after the rectification
NRValue and AC power supplies voltage V
ACBecome approximate linear proportional relation, its pass is:
V
NR≈k*V
AC+α。(here, k is a linear coefficient, and α is a constant)
As shown in Figure 3, the operating voltage (operation voltage) at protection actuating relay coil two ends is made as V1, and open voltage is made as V2, and V2＜V1.By carrying out such setting, can realize two kinds of following functions:
(1) the too high protection of alternating voltage
Under the normal voltage state, relay is in conducting (ON) state.When AC power supplies voltage increases; the magnitude of voltage of NR also increases thereupon; when the AC magnitude of voltage reaches the operating voltage of protection actuating relay coil; when being NR 〉=V1; protection actuating relay RY-1 disconnects (OFF); make whole electric power loop disconnect, thereby reach the effect in protection loop when high voltage that electrical and electronic component breaks down even the generation of the situation of getting angry of being fuming when having avoided high voltage.
(2) alternating voltage just often recovers automatically
Afterwards, when the AC magnitude of voltage reduced (recover normal), the magnitude of voltage of NR also reduced thereupon, and when V2＜NR＜V1, protection actuating relay RY-1 still is in disconnection (OFF) state.And when NR=V2, the electric power loop conducting of switching on again, the AC element of air-conditioning equipment will be with the running of the state before stopping.
By this way, under the situation of high abnormal voltage, instant and effective abnormal voltage protective effect has been played in each loop of air-conditioner device.
Fig. 2 is the operational flowchart of interchange over-pressure safety device described in the utility model, and its concrete operations flow process is to comprise the steps:
Step S10: electric equipment obtains power supply,
Step S20: the AC voltage transformation rectification of above-mentioned acquisition is a dc voltage,
Step S30: detect AC voltage principle according to dc voltage, in the design load scope, the dc voltage that AC goes into after power and the transformation rectification becomes to be similar to proportional relation.
Step S40: period parameters before established standards dc voltage value and the component parameters etc. as required, carry out concrete abnormal overvoltage protection.
Step S50: judge that whether dc voltage is more than or equal to protecting actuating relay operating voltage V1:
When dc voltage NR value rose to protection actuating relay operating voltage V1, protection actuating relay OFF (contact flicks) (S60) made whole electric power loop disconnect (step S70), then all elements quit work (S80).Subsequently, when dc voltage descends (S90), judge that dc voltage drops to and whether meet the open voltage V2 (step S100) of protection actuating relay.When dc voltage value NR is in V2＜NR＜V1, protection actuating relay OFF (contact flicks), electric power loop keeps no power supply state (S110); And when dc voltage value NR=V2; protect actuating relay ON (closing of contact) (S120); then complete machine turns round (S130) with the state before stopping, last electric power loop operate as normal (step S140), and the AC element of air-conditioning equipment will be with the running of the state before stopping.
In addition, when dc voltage NR value rises when not meeting protection actuating relay operating voltage V1, promptly during NR＜V1 3, protection actuating relay ON (closing of contact) S150, this moment, supply voltage was in normal state, need not abnormal protection.
AC overvoltage protection device its own power source described in the utility model is provided by the circuit board transformer of protected electrical equipment, makes that the power supply of protective device is stable, and synchronous with the power supply of protected electrical equipment.In addition; this device also utilizes the transformer in the circuit board of protected electrical equipment; transformer is when high voltage; temperature can rise; but when the supply voltage of input surpasses the protection magnitude of voltage of this device setting, because the loop of Circuit Fault on Secondary Transformer disconnects, the secondary side load will become very little; the temperature of transformer is reduced, so the anti-superhigh pressure of protective device itself.
In addition; the utility model not only is applicable to the overvoltage protection of individual event power supply; it equally also is applicable to the overvoltage protection that utilizes three phase mains; each of three phase mains is alternate can be achieved with above-mentioned same method; thereby can protect multiple electric equipment simultaneously, the scope of application increases greatly.
Claims (6)
1. AC overvoltage protection device; it is characterized in that comprising: power circuit, the micro-control unit that is connected the overvoltage protection control element on the power circuit loop and links to each other with power circuit output end, described micro-control unit MCU is connected with at least a portion electric loop in the protected electrical equipment.
2. AC overvoltage protection device according to claim 1; it is characterized in that: described power circuit comprises linear transformer, bridge rectifier loop, 12V voltage stabilizing circuit and the 5V voltage stabilizing circuit composition that is arranged on the protected appliance circuit plate, and described micro-control unit MCU is connected the output of 5V voltage stabilizing circuit.
3. AC overvoltage protection device according to claim 1; it is characterized in that: described power circuit comprises linear transformer, bridge rectifier loop, 12V voltage stabilizing circuit and the 5V voltage stabilizing circuit composition that is arranged on the protected appliance circuit plate, and described micro-control unit MCU is connected the output of 12V voltage stabilizing circuit.
4. according to claim 2 or 3 described AC overvoltage protection devices, it is characterized in that: described overvoltage protection control element is the protection actuating relay, described protection actuating relay is connected between bridge rectifier loop and the 12V voltage stabilizing circuit, the operating voltage V1 of dc voltage NR after the comparison rectification and protection actuating relay and the size of open voltage V2 thereof, when AC power supplies voltage increased, the magnitude of voltage of NR also increased thereupon, when NR=V1, relay OFF, electric power loop disconnects; When AC power supplies voltage reduced, the magnitude of voltage of NR also reduced thereupon, and when V2＜NR＜V1, relay is in the OFF state; When NR=V2, whole electric power loop is switched on again, and each loop of protected electrical equipment is connected and will turns round with the state before stopping.
5. AC overvoltage protection device according to claim 4 is characterized in that: described bridge rectifier loop and protection also are connected with between the actuating relay and make output voltage smoothly be the smoothing capacity of direct voltage.
6. AC overvoltage protection device according to claim 5 is characterized in that: at least a portion electric loop of described protected electrical equipment comprises compressor and peripheral loop, outer motor and peripheral loop, inner motor and peripheral loop and cross valve and the peripheral loop that links to each other by relay with the chip pin of micro-control unit MCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200572414U CN201413980Y (en) | 2009-05-26 | 2009-05-26 | Alternating current over-voltage protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200572414U CN201413980Y (en) | 2009-05-26 | 2009-05-26 | Alternating current over-voltage protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201413980Y true CN201413980Y (en) | 2010-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200572414U Expired - Lifetime CN201413980Y (en) | 2009-05-26 | 2009-05-26 | Alternating current over-voltage protection device |
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| CN (1) | CN201413980Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490248A (en) * | 2018-03-13 | 2018-09-04 | 浙江海洋大学 | A kind of voltage monitoring and voltage protection |
-
2009
- 2009-05-26 CN CN2009200572414U patent/CN201413980Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490248A (en) * | 2018-03-13 | 2018-09-04 | 浙江海洋大学 | A kind of voltage monitoring and voltage protection |
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| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100224 |
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| CX01 | Expiry of patent term |