CN202395438U - Safety protection circuit of plug - Google Patents
Safety protection circuit of plug Download PDFInfo
- Publication number
- CN202395438U CN202395438U CN2011205212982U CN201120521298U CN202395438U CN 202395438 U CN202395438 U CN 202395438U CN 2011205212982 U CN2011205212982 U CN 2011205212982U CN 201120521298 U CN201120521298 U CN 201120521298U CN 202395438 U CN202395438 U CN 202395438U
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- chip microcomputer
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- 238000001514 detection method Methods 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000002955 isolation Methods 0.000 claims abstract description 7
- 230000005611 electricity Effects 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 239000004973 liquid crystal related substance Substances 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000004146 energy storage Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Abstract
The utility model relates to a safety protection circuit of plug. The voltage power-down detection circuit comprises a voltage power-down detection circuit with an isolator for carrying out isolation detection on high voltage, a single chip microcomputer power-down processing circuit and a load discharge voltage loop, wherein the input end of the single chip microcomputer power-down processing circuit is connected with the signal output end of the voltage power-down detection circuit with the isolator, the output end of the single chip microcomputer power-down processing circuit is connected with the input end of the load discharge voltage loop, the single chip microcomputer power-down processing circuit processes a voltage feedback signal acquired by the voltage power-down detection circuit with the isolator, judges whether power is down or not, and controls the load discharge voltage loop to take effect if power is down. The utility model discloses can remove discharge resistance, reduce the stand-by power consumption of product, adopt the isolator, high-pressure input signal, low pressure output signal of telecommunication have good isolation, utilize the controllable low-voltage high-power consumption load of system from the area to bleed off the electricity moreover, need not external other loads and discharge, the line connection is simple, with low costs, the low power dissipation.
Description
Technical field
The utility model relates to household electrical appliance technical field, is specifically related to a kind of device of releasing with the plug detection of power loss and the residual voltage of shielding system.
Background technology
Because there are the energy storage components and parts such as electrochemical capacitor of X2 electric capacity, rectifying and wave-filtering in automatically controlled plate in the household appliances; After pulling out plug, energy storage components and parts electric energy stored can not be released immediately, causes the plug two ends to have residual voltage; This residual voltage is more than pulling out in 1 second still up to 100V AC; Considerably beyond the safe voltage of safety 36V regulation, this can damage human body, thus the electrical equipment that safety requires the band plug pull out plug after 1 second the plug residual voltage less than safe voltage.For reaching this safety requirement, this just need install the residual voltage leadage circuit additional.The residual voltage leadage circuit of household electrical appliances on the existing market, its circuit arrangement that mainly adopts are to rush down resistance one of X2 electric capacity two ends series connection to rush down electric treatment.Because need satisfy 1 second time restriction of safety, generally this discharge resistance resistance is less.So this kind technical scheme can cause the stand-by power consumption of product too high, can not satisfy the requirement of saving the energy.
Summary of the invention
The purpose of the utility model is to overcome the shortcoming of above-mentioned prior art and provides a kind of circuit to connect the safety protection circuit of the plug simple, that cost is low, low in energy consumption.
For realizing above-mentioned purpose; The technical scheme of the utility model is: the safety protection circuit of the plug of the utility model; Include voltage power-fail detection circuit, single-chip microcomputer power down process circuit, the load discharge voltage loop of high-tension electricity being carried out the band isolator of isolation detection; The input of single-chip microcomputer power down process circuit is connected with the signal output part of the voltage power-fail detection circuit of band isolator; The output of single-chip microcomputer power down process circuit is connected with the input in load discharge voltage loop; Single-chip microcomputer power down process circuit is handled the voltage feedback signal that the voltage power-fail detection circuit of being with isolator is collected, and judges whether power down, if judge that power down then comes into force in control load discharge voltage loop.
The voltage power-fail detection circuit of above-mentioned band isolator comprises divider resistance R1, R2, pull-up resistor R3, isolator and filter capacitor C1; Wherein the N of plug, L two ends are connected with divider resistance R1, R2 respectively through the voltage both positive and negative polarity behind the rectifying and wave-filtering; Signal is connected with driving isolator input both positive and negative polarity respectively after the dividing potential drop; The isolator output C utmost point connects and draws resistance R 3, output E utmost point ground connection, C, the indirect filter capacitor C1 of E.
The isolator U1 of above-mentioned voltage power-fail detection circuit is optical coupling isolator or inductance type isolator or condenser type isolator.
Above-mentioned load discharge voltage loop is the load discharge voltage loop of the controlled high power consumption of low pressure.
The load in above-mentioned load discharge voltage loop is a cooling fan, or charactron, or liquid crystal display screen, or its combination.
The beneficial effect of the utility model is: adopt isolator that effective isolation is carried out in high pressure collection and low voltage control two parts; And the high power consumption load of the controlled low pressure that using system itself carries is rushed down; Need not increase the load that other rush down electricity again; Lower the complexity of circuit, do not influenced the stand-by power consumption of entire product.The utility model is the safety protection circuit of the plug that a kind of circuit connects simply, cost is low, low in energy consumption.
Description of drawings
Fig. 1 is the theory diagram of the utility model;
Fig. 2 is the physical circuit figure of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the utility model is done further to specify.
As shown in Figure 1; The plug power loss detection means of the utility model; Include voltage power-fail detection circuit 1, single-chip microcomputer power down process circuit 2, the load discharge voltage loop 3 of high-tension electricity being carried out the band isolator of isolation detection; The input of single-chip microcomputer power down process circuit 2 is connected with the signal output part of the voltage power-fail detection circuit 1 of band isolator, and the output of single-chip microcomputer power down process circuit 2 is connected with the input in load discharge voltage loop 3, and the voltage feedback signal that the voltage power-fail detection circuit 1 of 2 pairs of bands of single-chip microcomputer power down process circuit isolator is collected is handled; Judge whether power down, if judge that power down then comes into force in control load discharge voltage loop 3.
In the present embodiment; The voltage power-fail detection circuit 1 of above-mentioned band isolator comprises divider resistance R1, R2, pull-up resistor R3, isolator U1 and filter capacitor C1; Wherein the N of plug, L two ends are connected with divider resistance R1, R2 respectively through the voltage both positive and negative polarity behind the rectifying and wave-filtering, and signal is connected with driving isolator U1 input both positive and negative polarity respectively after the dividing potential drop, and the isolator U1 output C utmost point connects and draws resistance R 3; Output E utmost point ground connection, C, the indirect filter capacitor C1 of E.In the present embodiment, isolator U1 is an optocoupler.
In the present embodiment; The voltage power-fail detection circuit of described band isolator carries out isolation detection to high-tension electricity, and the voltage feedback signal that the voltage power-fail detection circuit 1 of 2 pairs of bands of single-chip microcomputer power down process circuit isolator is collected is handled, and judges whether power down; When recognizing power down; Export a switching signal, open the electric energy of the 3 pairs of energy storage components and parts in load discharge voltage loop and release, thereby the residual voltage of plug is released in the safe range.
The isolator U1 of the voltage power-fail detection circuit 1 of above-mentioned band isolator is optical coupling isolator or inductance type isolator or condenser type isolator.
Above-mentioned load discharge voltage loop 3 is the load discharge voltage loop of the controlled high power consumption of low pressure, includes isolating transformer.Isolating transformer and divider resistance R1, R2 partly are connected with high-voltage rectifying, and high-voltage rectifying partly includes electric capacity, rectification circuit and accumulate electrochemical capacitor.
The load in above-mentioned load discharge voltage loop 3 is cooling fans, or charactron, or liquid crystal display screen, or its combination.
The operation principle of the utility model is following: the alternating current of plug changes into high voltage direct current through the rectification circuit and the electrolytic capacitor filter of high-voltage rectifying part; The voltage power-fail detection circuit 1 of band isolator carries out dividing potential drop through divider resistance R1, R2 to high voltage direct current; And voltage division signal is linked into the input of isolator U1; Isolator U1 is according to the voltage feedback signal of one 0 to the 5V low-voltage of size output of voltage division signal; The AD that voltage feedback signal is input to single-chip microcomputer in the single-chip microcomputer power down process circuit 2 gathers the I/O mouth, and 2 pairs of voltage feedback signals of single-chip microcomputer power down process circuit are handled.When plug did not pull out, the input of the voltage power-fail detection circuit 1 of band isolator was a HVDC signal of telecommunication, was enough to open the output of isolator U1 through the signal after R1, the R2 dividing potential drop, and this moment, the output signal of isolator U1 was a low level; After plug pulls out; It also reduces through the level that rectification circuit and electrochemical capacitor transform at once; Also reduce in succession through the signal after R1, the R2 dividing potential drop, because the reduction of the input terminal voltage of isolator U1, this moment, isolator U1 output turn-offed; Because the effect of pull-up resistor R3, this moment, the output signal of isolator U1 was a high level.The height of 2 pairs of voltage feedback signal level of single-chip microcomputer power down process circuit is discerned processing, identifies whether power down, if a switching signal is then exported in power down, opens the switch of the high power consumption load of controlled low pressure.The energy that the energy storage components and parts of entire circuit are stored is then released through the red high power consumption load of the controlled low pressure discharge voltage loop 3 partly of Fig. 2: after at first load is opened; Through release the earlier electric energy of energy storage electrochemical capacitor of isolating transformer; Then through the release electric energy of X2 capacitance stores of rectification circuit, till the energy of being stored all discharges.Because as the load of releasing is the high power consumption load of a low pressure, thus the electrical equipment that the method can satisfy the band plug fully pull out plug after 1 second the plug residual voltage less than the safety requirement of safe voltage.
Claims (5)
1. the safety protection circuit of a plug; It is characterized in that including voltage power-fail detection circuit (1), single-chip microcomputer power down process circuit (2), the load discharge voltage loop (3) of high-tension electricity being carried out the band isolator of isolation detection; The input of single-chip microcomputer power down process circuit (2) is connected with the signal output part of the voltage power-fail detection circuit (1) of band isolator; The output of single-chip microcomputer power down process circuit (2) is connected with the input in load discharge voltage loop (3); Single-chip microcomputer power down process circuit (2) is handled the voltage feedback signal that the voltage power-fail detection circuit (1) of being with isolator is collected; Judge whether power down, if judge power down then control load discharge voltage loop (3) come into force.
2. the safety protection circuit of plug according to claim 1; The voltage power-fail detection circuit (1) that it is characterized in that above-mentioned band isolator comprises divider resistance R1, R2, pull-up resistor R3, isolator U1 and filter capacitor C1; Wherein the N of plug, L two ends are connected with divider resistance R1, R2 respectively through the voltage both positive and negative polarity behind the rectifying and wave-filtering; Signal is connected with driving isolator U1 input both positive and negative polarity respectively after the dividing potential drop; The isolator U1 output C utmost point connects and draws resistance R 3, output E utmost point ground connection, C, the indirect filter capacitor C1 of E.
3. the safety protection circuit of plug according to claim 1, the isolator U1 that it is characterized in that above-mentioned voltage power-fail detection circuit (1) is optical coupling isolator or inductance type isolator or condenser type isolator.
4. the safety protection circuit of plug according to claim 1 is characterized in that the load discharge voltage loop of above-mentioned load discharge voltage loop (3) for the controlled high power consumption of low pressure.
5. the safety protection circuit of plug according to claim 1 is characterized in that the load in above-mentioned load discharge voltage loop (3) is a cooling fan, or charactron, or liquid crystal display screen, or its combination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205212982U CN202395438U (en) | 2011-12-14 | 2011-12-14 | Safety protection circuit of plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205212982U CN202395438U (en) | 2011-12-14 | 2011-12-14 | Safety protection circuit of plug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202395438U true CN202395438U (en) | 2012-08-22 |
Family
ID=46670340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205212982U Expired - Lifetime CN202395438U (en) | 2011-12-14 | 2011-12-14 | Safety protection circuit of plug |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202395438U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104423292A (en) * | 2013-08-23 | 2015-03-18 | 苏州三星电子有限公司 | X capacitor bleeding control method and circuit |
| CN108255079A (en) * | 2016-12-29 | 2018-07-06 | 广东美的生活电器制造有限公司 | Household electrical appliance, attaching plug electric discharge device and its control method |
-
2011
- 2011-12-14 CN CN2011205212982U patent/CN202395438U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104423292A (en) * | 2013-08-23 | 2015-03-18 | 苏州三星电子有限公司 | X capacitor bleeding control method and circuit |
| CN108255079A (en) * | 2016-12-29 | 2018-07-06 | 广东美的生活电器制造有限公司 | Household electrical appliance, attaching plug electric discharge device and its control method |
| CN108255079B (en) * | 2016-12-29 | 2020-04-10 | 广东美的生活电器制造有限公司 | Household appliance, power plug discharging device and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: MIDEA GROUP CO., LTD. Free format text: FORMER NAME: MEIDI GROUP CO. LTD. |
|
| CP03 | Change of name, title or address |
Address after: 528311 Guangdong, Foshan, Beijiao, the United States, the United States and the United States on the avenue of the United States, the headquarters of the United States building B floor, District, 26-28 Patentee after: MIDEA GROUP Co.,Ltd. Address before: 528311 Beijiao, Foshan, Shunde District, the town of Guangdong, the United States Avenue, No. 6 Patentee before: Midea Group |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120822 |