CN101562327A - Overvoltage protective device in wireless fixed phone charging mode - Google Patents
Overvoltage protective device in wireless fixed phone charging mode Download PDFInfo
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- CN101562327A CN101562327A CNA2008101042951A CN200810104295A CN101562327A CN 101562327 A CN101562327 A CN 101562327A CN A2008101042951 A CNA2008101042951 A CN A2008101042951A CN 200810104295 A CN200810104295 A CN 200810104295A CN 101562327 A CN101562327 A CN 101562327A
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Abstract
The invention discloses an overvoltage protective device in a wireless fixed phone charging mode, belonging to the field of communication. The device is connected between charging voltage and a charging circuit so as to perform an overvoltage protective function. After the charging voltage exceeds a certain voltage value, the overvoltage protective function of a fixed wireless phone is started, and the breakdown and the overburning caused by overvoltage can be prevented.
Description
Technical field
The invention belongs to mobile communication terminal field, refer in particular to a kind of in cellular phone charging, when the charger voltage instability, the charging voltage overvoltage the time can play effective protective effect to fixed CDMA WLL, especially in field of mobile phones.
Background technology
Cellular phone is from the wireless terminal to the wireless terminal, or the equipment of communication is provided from the wireless terminal to the catv terminal.It promptly can support the function conversed, also can support note and GPRS data service.Its technology have based on GSM, also have based on CDMA technology.Especially the fixed CDMA WLL based on CDMA technology occupies suitable market share in India market.Cellular phone has solved the communication problem in rural area on the one hand in the positive popularization of the vast rural area of India, and the while is expensive with respect to telephone, the good solution of also can yet be regarded as.Same fixed CDMA WLL has also obtained on the steamer using widely at automobile, because automobile can provide 12V DC (DC power supply) interface, so the charging inlet voltage of cellular phone has been defined as 12V on the steamer.In the rural area, along with being extensive use of of heliotechnics, solar cell also can provide the DC power supply of 12V to charge to cellular phone.If but the fluctuation of these DC power supply voltages surpasses certain limit, will cause certain damage to fixed CDMA WLL, therefore require the function that possesses overvoltage protection of fixed CDMA WLL itself.After charging voltage surpassed certain magnitude of voltage, the over-voltage protecting function of fixed CDMA WLL started, and prevented because the puncture that overvoltage causes is burnt.
Summary of the invention
The invention provides the over-pressure safety device under a kind of cellular phone charge mode, this device is connected between charging voltage and the charging circuit, finishes the function of overvoltage protection, and it comprises:
Diode (U4), its positive pole is connected with charging voltage, and negative pole is connected with the emitter of triode (U2);
The positive pole of resistance (R23) and diode (D9) is connected in series, the negative pole of diode (D9) is connected with the negative pole of diode (U4), one end of the other end of resistance (R23) and resistance (R14) and the base stage of triode (U10) are connected the other end ground connection of resistance (R14);
The grounded emitter of triode (U10), the base stage of its collector electrode and triode (U9) and an end of resistance (R38) are connected;
The negative pole of the other end of resistance (R38) and diode (D9), the emitter of the negative pole of diode (U4) and triode (U2) is connected;
The grounded emitter of triode (U9), its collector electrode links to each other by the base stage of resistance (R37) and triode (U2);
The collector electrode of triode (U2) directly is connected with charging circuit.
Preferably, its described diode (U4) is a fast recovery diode.
Preferably, its described diode (D9) is a Zener diode.
Preferably, the clamped voltage of its described diode (D9) is 36V.
Preferably, its described triode (U10) is high pressure resistant pipe.
Preferably, its described triode (U9) is high pressure resistant pipe.
Preferably, its described triode (U2) is a switch triode.
Preferably, the withstand voltage of its described triode (U10) is the input voltage from the CHARGE_IN end.
Preferably, the withstand voltage of its described triode (U9) is the input voltage from the CHARGE_IN end.
Preferably, the withstand voltage of its described triode (U2) is the input voltage from the CHARGE_IN end.
Beneficial effect of the present invention is can be after surpassing certain magnitude of voltage when charging voltage, and the over-voltage protecting function of fixed CDMA WLL starts, and prevents because the puncture that overvoltage causes is burnt.
Description of drawings
Fig. 1 is charging circuit figure of the prior art;
Fig. 2 is a circuit diagram of the present invention.
Embodiment
In the market in the fixed CDMA WLL of Shi Yonging; there is not corresponding overvoltage crowbar; as shown in Figure 1; charging voltage CHARGER_IN directly gives charging circuit through a resistance R 39; charge; in this manner, if the fluctuation of voltage surpasses certain limit, will cause certain damage to fixed CDMA WLL.
For avoiding the generation of this damage; the invention provides a kind of overvoltage crowbar; replace resistance R 39; just between the direct voltage DC_12 of charging voltage CHARGER_IN and output, add protective circuit; as shown in Figure 2, like this when charging voltage surpasses the voltage of regulation, during as 36V; circuit meeting auto power off, the protection fixed CDMA WLL.
Its concrete implementation process as shown in Figure 2, charging voltage with regulation is that 36V is an example in the present invention, when input voltage CHARGER_IN is lower than 36V, diode D9 ends, the base voltage of triode U10 is 0V, triode U10 is operated in cut-off state, this moment, the base voltage of triode U9 was high, and triode U9 is operated in saturation condition, the collector and emitter conducting of triode U9, thereby the emitter of switch triode U2 and collector electrode conducting, input voltage CHARGER_IN is through U4 like this, and U2 delivers to DC.12V with voltage, deliver to the charging circuit of fixed CDMA WLL, charge.
When input input voltage CHARGER_IN is equal to or greater than 36V, diode D9 conducting, the base voltage of triode U10 is a high level, triode U10 is operated in conducting state, the base voltage of triode U9 and ground conducting at this moment, triode U9 is operated in cut-off state, and the collector and emitter of triode U9 ends.Thereby the emitter of triode U2 and collector cut-off, input voltage CHARGER_IN, is cut off when passing through triode U2 again through diode U4 like this.Thereby protected fixed CDMA WLL, prevented because the short circuit that overvoltage causes burns out.
Should be pointed out that the present invention is is that 36V is that example describes with the charging voltage, as those skilled in the art, this charging voltage is not only limited to 36V, can regulate according to circuit.
Preferably, diode U4 is a fast recovery diode.
Preferably, diode D9 is a Zener diode.
Preferably, the clamped voltage of diode D9 is 36V.
Preferably, involved diode among the present invention, triode is high pressure resistant, and withstand voltage is the input voltage from input voltage CHARGER_IN end.
Such scheme example of the present invention only is used for illustrative purposes, is not in order to limit the present invention.Those skilled in the art can make the various modifications that are equal within the scope of the invention, as adopts different circuit design, and with different controllers etc., its operation principle is similar, these distortion and change and all do not break away from protection scope of the present invention.
Claims (10)
1. the over-pressure safety device under the cellular phone charge mode, this device is connected between charging voltage and the charging circuit, finishes the function of overvoltage protection, and it comprises:
Diode (U4), its positive pole is connected with charging voltage, and negative pole is connected with the emitter of triode (U2);
The positive pole of resistance (R23) and diode (D9) is connected in series, the negative pole of diode (D9) is connected with the negative pole of diode (U4), one end of the other end of resistance (R23) and resistance (R14) and the base stage of triode (U10) are connected the other end ground connection of resistance (R14);
The grounded emitter of triode (U10), the base stage of its collector electrode and triode (U9) and an end of resistance (R38) are connected;
The negative pole of the other end of resistance (R38) and diode (D9), the emitter of the negative pole of diode (U4) and triode (U2) is connected;
The grounded emitter of triode (U9), its collector electrode links to each other by the base stage of resistance (R37) and triode (U2); The collector electrode of triode (U2) directly is connected with charging circuit.
2. the over-pressure safety device under a kind of cellular phone charge mode according to claim 1 is characterized in that diode (U4) is a fast recovery diode.
3. the over-pressure safety device under a kind of cellular phone charge mode according to claim 1 is characterized in that diode (D9) is a Zener diode.
4. the over-pressure safety device under a kind of cellular phone charge mode according to claim 3, the clamped voltage that it is characterized in that diode (D9) is 36V.
5. the over-pressure safety device under a kind of cellular phone charge mode according to claim 1 is characterized in that triode (U10) is high pressure resistant pipe.
6. the over-pressure safety device under a kind of cellular phone charge mode according to claim 1 is characterized in that triode (U9) is high pressure resistant pipe.
7. the over-pressure safety device under a kind of cellular phone charge mode according to claim 1 is characterized in that triode (U2) is a switch triode.
8. the over-pressure safety device under a kind of cellular phone charge mode according to claim 1 is characterized in that the withstand voltage of triode (U10) is the input voltage from the CHARGE_IN end.
9. the over-pressure safety device under a kind of cellular phone charge mode according to claim 1 is characterized in that the withstand voltage of triode (U9) is the input voltage from the CHARGE_IN end.
10. the over-pressure safety device under a kind of cellular phone charge mode according to claim 1 is characterized in that the withstand voltage of triode (U2) is the input voltage from the CHARGE_IN end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101042951A CN101562327A (en) | 2008-04-17 | 2008-04-17 | Overvoltage protective device in wireless fixed phone charging mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101042951A CN101562327A (en) | 2008-04-17 | 2008-04-17 | Overvoltage protective device in wireless fixed phone charging mode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101562327A true CN101562327A (en) | 2009-10-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101042951A Pending CN101562327A (en) | 2008-04-17 | 2008-04-17 | Overvoltage protective device in wireless fixed phone charging mode |
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| CN (1) | CN101562327A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102201664A (en) * | 2010-03-25 | 2011-09-28 | 鸿富锦精密工业（深圳）有限公司 | Voltage-stabilizing circuit system |
| CN102780202A (en) * | 2011-05-09 | 2012-11-14 | 海洋王照明科技股份有限公司 | Overvoltage protection circuit and lamp |
| CN105640286A (en) * | 2016-04-14 | 2016-06-08 | 天津市畅悦电子科技有限公司 | Anti-reverse lifting and falling control circuit for smokeproof screen system |
| CN105846412A (en) * | 2015-01-12 | 2016-08-10 | 咸瑞科技股份有限公司 | Surge protection device |
| CN105934021A (en) * | 2016-05-03 | 2016-09-07 | 电子科技大学 | Overvoltage adjusting circuit for linear constant-current driving LED |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2548839A1 (en) * | 1983-07-08 | 1985-01-11 | Peugeot | Control and/or monitoring installation comprising a device for protecting consumers of power, and for the supply line to these consumers |
| JPH0622554A (en) * | 1992-07-07 | 1994-01-28 | Matsushita Electric Ind Co Ltd | Power supply circuit |
| CN201038731Y (en) * | 2007-04-17 | 2008-03-19 | 青岛海信电器股份有限公司 | Overvoltage protection circuit |
-
2008
- 2008-04-17 CN CNA2008101042951A patent/CN101562327A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2548839A1 (en) * | 1983-07-08 | 1985-01-11 | Peugeot | Control and/or monitoring installation comprising a device for protecting consumers of power, and for the supply line to these consumers |
| JPH0622554A (en) * | 1992-07-07 | 1994-01-28 | Matsushita Electric Ind Co Ltd | Power supply circuit |
| CN201038731Y (en) * | 2007-04-17 | 2008-03-19 | 青岛海信电器股份有限公司 | Overvoltage protection circuit |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102201664A (en) * | 2010-03-25 | 2011-09-28 | 鸿富锦精密工业（深圳）有限公司 | Voltage-stabilizing circuit system |
| CN102780202A (en) * | 2011-05-09 | 2012-11-14 | 海洋王照明科技股份有限公司 | Overvoltage protection circuit and lamp |
| CN105846412A (en) * | 2015-01-12 | 2016-08-10 | 咸瑞科技股份有限公司 | Surge protection device |
| CN105846412B (en) * | 2015-01-12 | 2018-07-24 | 咸瑞科技股份有限公司 | Surge protection means |
| CN105640286A (en) * | 2016-04-14 | 2016-06-08 | 天津市畅悦电子科技有限公司 | Anti-reverse lifting and falling control circuit for smokeproof screen system |
| CN105934021A (en) * | 2016-05-03 | 2016-09-07 | 电子科技大学 | Overvoltage adjusting circuit for linear constant-current driving LED |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20091021 |