CN203027229U - Power switch circuit for preventing electric spark - Google Patents
Power switch circuit for preventing electric spark Download PDFInfo
- Publication number
- CN203027229U CN203027229U CN 201320021621 CN201320021621U CN203027229U CN 203027229 U CN203027229 U CN 203027229U CN 201320021621 CN201320021621 CN 201320021621 CN 201320021621 U CN201320021621 U CN 201320021621U CN 203027229 U CN203027229 U CN 203027229U
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- Prior art keywords
- electric spark
- resistance
- cash register
- power
- process chip
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- Expired - Fee Related
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Abstract
The utility model relates to a power switch circuit for preventing an electric spark, which is applied to a fiscal cash register. The fiscal cash register is electrically connected with an electric supply through a power adapter; and an electric spark protecting circuit is electrically connected between the fiscal cash register and the power adapter. According to the power switch circuit, the electric spark protecting circuit is additionally arranged between the fiscal cash register and the power adapter, so that the electric spark protecting circuit can delay to supply power to the fiscal cash register when a user does not turn off a power switch to insert and extract a direct current (DC) plug, so as to avoid the electric spark phenomenon due to the fact that the power switch is not turned off to cause a dangerous accident.
Description
Technical field
The utility model relates to switching circuit, is specifically related to a kind of power switch circuit that electric spark appears in the equipment plug that is applied to prevent from tax-control cash register plugging.
Background technology
Tax-control cash register is a kind of electronic cash register with tax control function, and it has guaranteed correct generation, reliable memory and the safe transfer of management data, and can realize the requirement with tax control authority management and data validation etc.The input current of general tax-control cash register is 24V3A, the normal operational procedure of using is to need first powered-down switch, plug again its DC plug, but a lot of users usually can not be by normal operational procedure operation, but due to custom or for the directly plug DC plug of saving trouble, can cause electric spark, if be used in the occasions such as gas station can bring danger.
The utility model content
For the deficiencies in the prior art; the utility model provides a kind of power switch circuit that prevents electric spark; it is by setting up anti-electric spark protective circuit between tax-control cash register and power supply adaptor, avoid electric spark phenomenon cause danger accident occurring because of powered-down switch not.
For achieving the above object, the utility model adopts following technical scheme:
A kind of power switch circuit that prevents electric spark is applied in tax-control cash register, and described tax-control cash register is electrically connected by a power supply adaptor and civil power, is electrically connected an anti-electric spark protective circuit between described tax-control cash register and power supply adaptor.
as improvement of the present utility model, described anti-electric spark protective circuit comprises process chip U1, NPN triode Q2, PMOS manages Q1, the output J1 of power supply adaptor is by a resistance R 1 and resistance R 8 ground connection, the power end VDD of described process chip U1 is connected between a resistance R 1 and resistance R 8, the end of the mains switch SW of tax-control cash register is connected in the earth terminal VSS of process chip U1, the other end is connected in the middle broken ends of fractured bone INT of process chip U1, the middle broken ends of fractured bone INT of process chip U1 also is connected in the base stage of NPN triode Q2 by a resistance R 2 and resistance R 6, the output P61 of described process chip U1 is connected in the emitter of NPN triode Q2, the collector electrode of NPN triode Q2 is connected to the grid of PMOS pipe Q1 by a resistance R 5, the source electrode of PMOS pipe Q1 is connected in the output J1 of power supply adaptor, the drain electrode of PMOS pipe Q1 is connected to the power input of tax-control cash register, the base stage of NPN triode Q2 is also passed through a divider resistance R7 ground connection, cross-over connection one resistance R 3 between the drain electrode of PMOS pipe Q1 and source electrode.
Preferably, described anti-electric spark protective circuit further comprises a voltage-stabiliser tube D2, and the positive pole of described voltage-stabiliser tube D2 is connected with the power end VDD of process chip U1, the minus earth of voltage-stabiliser tube D2.
Preferably, the operating voltage of described voltage-stabiliser tube D2 is 5.1V.
Preferably, the output voltage of power supply adaptor is 24V.
Preferably, described process chip U1 is single-chip microcomputer EM78P153S.
The power switch circuit that prevents electric spark that the utility model is set forth; compared with prior art; its beneficial effect is: the utility model is being prevented the electric spark protective circuit by setting up between tax-control cash register and power supply adaptor; when user's powered-down switch and when plugging DC plug not; should anti-electric spark protective circuit can delay time to the tax-control cash register power supply, thereby avoid electric spark phenomenon cause danger accident occurring because of powered-down switch not.
Description of drawings
Accompanying drawing 1 prevents the structured flowchart of the power switch circuit of electric spark for the utility model;
Accompanying drawing 2 is the circuit theory diagrams of sparkproof protective circuit in Fig. 1.
Embodiment
Below, by reference to the accompanying drawings and embodiment, prevent that to of the present utility model the power switch circuit of electric spark is described further, so that clearerly understand the utility model technological thought required for protection.
As described in Figure 1; a kind of power switch circuit that prevents electric spark; be applied in tax-control cash register 3; this tax-control cash register 3 is electrically connected by a power supply adaptor 1 and civil power; power supply adaptor 1 converts civil power to stable 24V direct voltage and supplies with tax-control cash register 3; for fear of user's powered-down and directly plug the DC plug of tax-control cash register 3 not, in the utility model preferred embodiment, be electrically connected an anti-electric spark protective circuit 2 between tax-control cash register 3 and power supply adaptor 1.Should anti-electric spark protective circuit 2 can be with the output voltage time-delay of power supply adaptor 1 to the tax-control cash register power supply, concrete delay time arranges according to the client, preferred 2 seconds, thereby avoid electric spark phenomenon cause danger accident occurring because of powered-down switch not.
As described in Figure 2, anti-electric spark protective circuit 2 comprises that process chip U1, NPN triode Q2, PMOS manage Q1, the preferred single-chip microcomputer EM78P153S of process chip U1.the output J1 of power supply adaptor is by a resistance R 1 and resistance R 8 ground connection, the power end VDD of described process chip U1 is connected between a resistance R 1 and resistance R 8, the end of the mains switch SW of tax-control cash register is connected in the earth terminal VSS of process chip U1, the other end is connected in the middle broken ends of fractured bone INT of process chip U1, the middle broken ends of fractured bone INT of process chip U1 also is connected in the base stage of NPN triode Q2 by a resistance R 2 and resistance R 6, the output P61 of described process chip U1 is connected in the emitter of NPN triode Q2, the collector electrode of NPN triode Q2 is connected to the grid of PMOS pipe Q1 by a resistance R 5, the source electrode of PMOS pipe Q1 is connected in the output J1 of power supply adaptor, the drain electrode of PMOS pipe Q1 is connected to the power input of tax-control cash register, the base stage of NPN triode Q2 is also passed through a divider resistance R7 ground connection, cross-over connection one resistance R 3 between the drain electrode of PMOS pipe Q1 and source electrode.
Its operation principle is: the middle broken ends of fractured bone INT of process chip U1 detects mains switch SW, after the DC plug of tax-control cash register is plugged, output P61 exports high level, (for example 2 seconds) closed electrical source switch SW within the regular hour, middle broken ends of fractured bone INT does not move, and output P61 continues the output high level, NPN triode Q2 cut-off this moment, thereby make PMOS pipe Q1 also be in cut-off state, power supply adaptor 1 can not be tax-control cash register 3 power supplies; After the regular hour, then closed electrical source switch SW, middle broken ends of fractured bone INT just is pulled to low level to output P61, at this moment, NPN triode Q2 conducting, thus make PMOS pipe Q1 also be in conducting state, and power supply adaptor 1 output 24V direct current is to tax-control cash register 3.Equally, if powered-down switch SW not, and the DC plug of directly pegging graft, although this moment, mains switch SW was in closure state, power supply adaptor 1 can not be tax-control cash register 3 power supplies, is only that first disconnecting power switch SW just can make its closure tax-control cash register 3 work later again in the regular hour.
Preferably, described anti-electric spark protective circuit further comprises a voltage-stabiliser tube D2, and the positive pole of described voltage-stabiliser tube D2 is connected with the power end VDD of process chip U1, the minus earth of voltage-stabiliser tube D2.The operating voltage of voltage-stabiliser tube D2 is 5.1V, has guaranteed the stable operating voltage of process chip U1.
For a person skilled in the art, can make other various corresponding changes and distortion according to technical scheme described above and design, and these all changes and the distortion all should belong to the protection range of the utility model claim within.
Claims (6)
1. power switch circuit that prevents electric spark; be applied in tax-control cash register; described tax-control cash register is electrically connected by a power supply adaptor and civil power, it is characterized in that, is electrically connected an anti-electric spark protective circuit between described tax-control cash register and power supply adaptor.
2. the power switch circuit that prevents electric spark according to claim 1, it is characterized in that, described anti-electric spark protective circuit comprises process chip U1, NPN triode Q2, PMOS manages Q1, the output J1 of power supply adaptor is by a resistance R 1 and resistance R 8 ground connection, the power end VDD of described process chip U1 is connected between a resistance R 1 and resistance R 8, the end of the mains switch SW of tax-control cash register is connected in the earth terminal VSS of process chip U1, the other end is connected in the middle broken ends of fractured bone INT of process chip U1, the middle broken ends of fractured bone INT of process chip U1 also is connected in the base stage of NPN triode Q2 by a resistance R 2 and resistance R 6, the output P61 of described process chip U1 is connected in the emitter of NPN triode Q2, the collector electrode of NPN triode Q2 is connected to the grid of PMOS pipe Q1 by a resistance R 5, the source electrode of PMOS pipe Q1 is connected in the output J1 of power supply adaptor, the drain electrode of PMOS pipe Q1 is connected to the power input of tax-control cash register, the base stage of NPN triode Q2 is also passed through a divider resistance R7 ground connection, cross-over connection one resistance R 3 between the drain electrode of PMOS pipe Q1 and source electrode.
3. the power switch circuit that prevents electric spark according to claim 2; it is characterized in that; described anti-electric spark protective circuit further comprises a voltage-stabiliser tube D2, and the positive pole of described voltage-stabiliser tube D2 is connected with the power end VDD of process chip U1, the minus earth of voltage-stabiliser tube D2.
4. the power switch circuit that prevents electric spark according to claim 3, is characterized in that, the operating voltage of described voltage-stabiliser tube D2 is 5.1V.
5. the power switch circuit that prevents electric spark according to claim 1 and 2, is characterized in that, the output voltage of power supply adaptor is 24V.
6. the power switch circuit that prevents electric spark according to claim 2, is characterized in that, described process chip U1 is single-chip microcomputer EM78P153S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320021621 CN203027229U (en) | 2013-01-15 | 2013-01-15 | Power switch circuit for preventing electric spark |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320021621 CN203027229U (en) | 2013-01-15 | 2013-01-15 | Power switch circuit for preventing electric spark |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203027229U true CN203027229U (en) | 2013-06-26 |
Family
ID=48651172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320021621 Expired - Fee Related CN203027229U (en) | 2013-01-15 | 2013-01-15 | Power switch circuit for preventing electric spark |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203027229U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110221673A (en) * | 2019-06-14 | 2019-09-10 | 广东虹勤通讯技术有限公司 | A kind of circuit to sparkle when notebook adapter being prevented to be inserted into and method |
| WO2020168949A1 (en) * | 2019-02-18 | 2020-08-27 | 华为技术有限公司 | Display driving circuit-based terminal device |
-
2013
- 2013-01-15 CN CN 201320021621 patent/CN203027229U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020168949A1 (en) * | 2019-02-18 | 2020-08-27 | 华为技术有限公司 | Display driving circuit-based terminal device |
| CN110221673A (en) * | 2019-06-14 | 2019-09-10 | 广东虹勤通讯技术有限公司 | A kind of circuit to sparkle when notebook adapter being prevented to be inserted into and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130626 Termination date: 20170115 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |