CN201639322U - RS-232 (Recommend Standard-232) charging and supply circuit - Google Patents
RS-232 (Recommend Standard-232) charging and supply circuit Download PDFInfo
- Publication number
- CN201639322U CN201639322U CN2010201011265U CN201020101126U CN201639322U CN 201639322 U CN201639322 U CN 201639322U CN 2010201011265 U CN2010201011265 U CN 2010201011265U CN 201020101126 U CN201020101126 U CN 201020101126U CN 201639322 U CN201639322 U CN 201639322U
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- lithium battery
- analog switch
- load
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model provides an RS-232 (Recommend Standard-232) charging and supply circuit which is characterized by comprising an RS-232 plug, a lithium battery, an analogue switch and a load, wherein the RS-232 plug and the lithium battery are connected in parallel, and the analogue switch is connected with the RS-232 plug in parallel after connected with the load in series. A TXD (Transmit Data) signal of an RS-232 interface is used for charging the built-in lithium battery of equipment provided with the RS-232 plug; the equipment provided with the RS-232 plug can supply power to the load by using the lithium battery without an external power supply; the built-in lithium battery does not discharge when the load is disconnected; the built-in lithium battery does not discharge when the equipment is not inserted in the RS-232 interface; and the built-in lithium battery does not discharge when the equipment is inserted in the RS-232 interface but a computer or single chip microcontroller is powered off.
Description
Technical field
The utility model relates to a kind of RS-232 charging and power supply circuits.
Background technology
If the equipment power consumption of band RS-232 interface is very little, such as early stage RS-232 interface mouse (being commonly called as the square opening mouse) and some passive RS-232/RS-485 transducer is to utilize the voltage of holding wire of the RS-232 interface of computer to carry out powered operation, that is to say and need not to power dispense with outer connecting power in other words conj.or perhaps, if but power consumption is bigger, then must external power supply or use powered battery.Though some RS-232 equipment has used the built-in lithium battery power supply, need charging separately, and need turn off lithium battery with hand switch when not using at ordinary times, otherwise electricity can bleed off as power supply.The shortcoming of using external power supply is exactly inconvenient.The shortcoming of using lithium battery still but will charge separately also is to use inconvenience.In a single day it is not only inconvenient to need manually to turn off at ordinary times the lithium battery power supply, and forgets to turn off and also will in time charge thereby influence normal the use when working so.
The utility model content
The technical problems to be solved in the utility model is: a kind of RS-232 charging and power supply circuits are provided, with the RS-232 interface that realizes utilizing computer the built-in lithium battery of the equipment of band RS-232 interface is charged and lithium battery to the power supply of load.
The utility model is to solve the problems of the technologies described above the technical scheme of being taked to be: a kind of RS-232 charging and power supply circuits, and it is characterized in that: it comprises RS-232 plug, lithium battery, analog switch and load; Wherein the RS-232 plug is in parallel with lithium battery, and analog switch is with in parallel with the RS-232 plug again after load is connected.
Press such scheme, described RS-232 plug and computer standard DB-9 pin RS-232 socket coupling; The GNG end of RS-232 plug extremely links to each other with the V+ utmost point of the positive pole of described lithium battery, described analog switch, the Vin+ of described load; The TXD end of RS-232 plug links to each other with the negative pole of lithium battery by a diode; The TXD end of RS-232 plug also extremely links to each other with the IN end and the V-of analog switch by a diode respectively; The COM end of analog switch extremely links to each other with the Vin-of load; The NC end of analog switch links to each other with the negative pole of lithium battery.
Press such scheme, voltage stabilizing didoe in parallel between the described RS-232 plug both positive and negative polarity.
As another preferred version of the present utility model, described RS-232 plug Transistor-Transistor Logic level RS-232 plug; The GND end of RS-232 plug extremely links to each other with the V-utmost point of the negative pole of described lithium battery, described analog switch, the Vin-of described load; The TXD end of RS-232 plug links to each other with the positive pole of lithium battery by a diode; The TXD end of RS-232 plug also extremely links to each other with the IN end and the V+ of analog switch by a diode respectively; The COM end of analog switch extremely links to each other with the Vin+ of load; The NC end of analog switch links to each other with the positive pole of lithium battery.
Press such scheme, voltage stabilizing didoe in parallel between the described RS-232 plug both positive and negative polarity.
Operation principle of the present utility model is: when the RS-232 plug inserts on the computer RS-232 socket, if computer is energising work, during non-transmission data, can charge so to lithium battery, load links to each other with lithium battery by analog switch, make lithium battery to electric, the unidirectional conducting of diode guarantees the directivity of charging.
The beneficial effects of the utility model are: the TXD signal that 1, utilizes RS-232 interface charges to the built-in lithium battery of the equipment of band RS-232 plug; 2, the equipment of band RS-232 plug can be with lithium battery to electric thereby dispense with outer connecting power again; 3, built-in lithium battery does not discharge during disconnecting consumers; Built-in lithium battery did not discharge when 4, equipment was not inserted RS-232 interface; 5, equipment is inserted on the RS-232 interface of computer but built-in lithium battery does not discharge when computer or single-chip microcomputer outage.
Description of drawings
Fig. 1 is a schematic diagram of the present utility model
Fig. 2 is the structure chart of an embodiment of the utility model
Fig. 3 is the structure chart of another embodiment of the utility model
Embodiment
Embodiment one:
Fig. 1 is a schematic diagram of the present utility model, and Fig. 2 is the structure chart of embodiment one, RS-232 plug and computer standard DB-9 pin RS-232 socket coupling; The GNG end of RS-232 plug extremely links to each other with the positive pole of lithium battery, the V+ utmost point of analog switch, the Vin+ of load; The TXD end of RS-232 plug links to each other with the negative pole of lithium battery by diode D1; The TXD end of RS-232 plug links to each other with the IN end of analog switch by diode D3, extremely links to each other with analog switch V-by diode D2; The COM end of analog switch extremely links to each other with the Vin-of load; The NC end of analog switch links to each other with the negative pole of lithium battery.Voltage stabilizing didoe D4 in parallel between the RS-232 plug both positive and negative polarity.
Shown in Fig. 2 is to have connected the TXD signal, also can connect RTS or DTR signal.Lithium battery is the same with common mobile phone lithium battery, can repeatedly charge, and the rechargeable battery of in fact using other kind too.Analog switch is the MAX317 integrated circuit of MAXIM company, and the negative pole V-of power supply is labeled as GND on the MAX317 handbook; MAX317 is a kind of one-way switch, also can select the variable connector integrated circuit for use, only with wherein one the tunnel just can.Load is the various circuit that can drive with lithium battery.The voltage of voltage regulation of voltage stabilizing didoe D4 is 5.1V, is used to protect lithium battery to avoid charging voltage too high.D1, D2 and D3 are the regular tap diode, and model is 1N4148.Because the TXD voltage of signals is negative value (about 9V) at ordinary times, receives TXD so the direction of diode D1, D2 and D3 is negative pole.
The TXD of RS-232 plug holds the negative pole of receiving lithium ion battery by diode D1, and the GND end of RS-232 plug is directly received the positive pole of lithium ion battery.When the RS-232 plug is inserted on the RS-232 socket of computer, if this computer-chronograph is energising work, just have when TXD holds level with both hands so approximately-voltage of 9V.This voltage charges to lithium ion battery by GND and diode D1.Interim short pulse+9V level only just can appear in TXD end when RS-232 interface sends data, send at ordinary times to finish and the level when being ready for sending is-9V always, so can not influence charging; In addition the unidirectional on state characteristic of diode D1 guaranteed+the 9V level can not pass to the negative pole of lithium battery.Voltage stabilizing didoe D4 provides the charging overvoltage protection.The TXD end is also received the IN end and the V-end of analog switch by diode D2.Because IN end and V-end are that short circuit is connected, thus as long as simulation is opened between 3 V+ end and the V-end supply power voltage is arranged because the IN end is always held the same low level with V-, so NC hold and COM hold between conducting always.Like this when the RS-232 plug is inserted on the RS-232 socket of computer, if this computer-chronograph is energising work, the TXD end just has the voltage of about-9V so, between the V+ end of analog switch and the V-end supply power voltage is arranged still after the process diode D2, and IN holds low level always, so be conducting this moment between NC and the COM, lithium battery just can be powered to load; (9V) obvious voltage (4.2V) greater than lithium battery is so the TXD end can charge to lithium battery through GND end and diode D1 the magnitude of voltage of holding owing to TXD always simultaneously.At ordinary times during disconnecting consumers, as long as the RS-232 plug is inserted on the RS-232 socket of computer and computer is energising work, the TXD end can be always charge to lithium battery through GND end and diode D1, thus since disconnected this moment load in this case lithium battery be that only charging is not discharged.The other effect of diode D1, D2, D3 also be the level state when TXD end become+the TXD end can't be added to this positive level the negative pole of lithium battery and the V-end and the IN of analog switch holds during 9V (level 0), can avoid the damage to lithium battery and analog switch like this.
When the RS-232 plug was inserted on the RS-232 socket of computer, if the not energising of this computer-chronograph, then analog switch did not have supply power voltage, and this moment, the NC end disconnected between holding with COM, and lithium battery just can't be to electric; Simultaneously because the positive pole of diode D1 is connected on the negative pole of lithium ion battery, so lithium battery also can't be to the RS-232 interface discharge of computer.When the RS-232 plug is extracted the RS-232 socket of computer, be equivalent to the not energising of this computer-chronograph, so lithium battery also can't be to electric, since just do not exist lithium battery may also not have the possibility of computer to lithium cell charging to what the RS-232 interface of computer was discharged since pulled up plug in addition.
Embodiment two:
Shown in figure three, the principle of embodiment two is identical with embodiment one, structure and embodiment one are roughly the same, its difference is: described RS-232 plug and single-chip microcomputer Transistor-Transistor Logic level RS-232 interface are complementary, and the positive pole of lithium battery and negative pole have been put upside down, the V+ of analog switch and V-have put upside down, the Vin+ of load and Vin-have put upside down, the direction of diode D1, D2, D3, D4 has also been put upside down; Analog switch has also become the high level conducting by the low level conducting in addition, and corresponding model changes the MAX318 integrated circuit of MAXIM company into.
Claims (5)
1. a RS-232 charges and power supply circuits, and it is characterized in that: it comprises RS-232 plug, lithium battery, analog switch and load; Wherein the RS-232 plug is in parallel with lithium battery, and analog switch is with in parallel with the RS-232 plug again after load is connected.
2. RS-232 charging according to claim 1 and power supply circuits is characterized in that: described RS-232 plug and computer standard DB-9 pin RS-232 socket coupling; The GNG end of RS-232 plug extremely links to each other with the V+ utmost point of the positive pole of described lithium battery, described analog switch, the Vin+ of described load; The TXD end of RS-232 plug links to each other with the negative pole of lithium battery by a diode; The TXD end of RS-232 plug also extremely links to each other with the IN end and the V-of analog switch by a diode respectively; The COM end of analog switch extremely links to each other with the Vin-of load; The NC end of analog switch links to each other with the negative pole of lithium battery.
3. RS-232 charging according to claim 2 and power supply circuits is characterized in that: voltage stabilizing didoe in parallel between the described RS-232 plug both positive and negative polarity.
4. RS-232 charging according to claim 1 and power supply circuits, it is characterized in that: described RS-232 plug is a Transistor-Transistor Logic level RS-232 plug; The GND end of RS-232 plug extremely links to each other with the V-utmost point of the negative pole of described lithium battery, described analog switch, the Vin-of described load; The TXD end of RS-232 plug links to each other with the positive pole of lithium battery by a diode; The TXD end of RS-232 plug also extremely links to each other with the IN end and the V+ of analog switch by a diode respectively; The COM end of analog switch extremely links to each other with the Vin+ of load; The NC end of analog switch links to each other with the positive pole of lithium battery.
5. RS-232 charging according to claim 4 and power supply circuits is characterized in that: voltage stabilizing didoe in parallel between the described RS-232 plug both positive and negative polarity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201011265U CN201639322U (en) | 2010-01-22 | 2010-01-22 | RS-232 (Recommend Standard-232) charging and supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201011265U CN201639322U (en) | 2010-01-22 | 2010-01-22 | RS-232 (Recommend Standard-232) charging and supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201639322U true CN201639322U (en) | 2010-11-17 |
Family
ID=43083828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201011265U Expired - Fee Related CN201639322U (en) | 2010-01-22 | 2010-01-22 | RS-232 (Recommend Standard-232) charging and supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201639322U (en) |
-
2010
- 2010-01-22 CN CN2010201011265U patent/CN201639322U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101117 Termination date: 20110122 |