CN2800360Y - CMOS power supply device - Google Patents
CMOS power supply device Download PDFInfo
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- CN2800360Y CN2800360Y CN 200520005972 CN200520005972U CN2800360Y CN 2800360 Y CN2800360 Y CN 2800360Y CN 200520005972 CN200520005972 CN 200520005972 CN 200520005972 U CN200520005972 U CN 200520005972U CN 2800360 Y CN2800360 Y CN 2800360Y
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- Prior art keywords
- rechargeable battery
- comparator
- voltage
- power supply
- reference voltage
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- 230000001276 controlling effect Effects 0.000 claims description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052744 lithium Inorganic materials 0.000 claims description 4
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000007774 longterm Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 9
- 230000009977 dual effect Effects 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 5
- 238000001914 filtration Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a CMOS power supply device. The device comprises a rechargeable cell, a charge power source, a charge switch, a voltage acquiring unit and a control unit, wherein the rechargeable cell is used for supplying power to a CMOS when a system is shut down or is not supplied with power, the charge power source is used for supplying a stabilized voltage power source when the rechargeable cell is required to be charged, the charge switch which is connected with the rechargeable cell and the charge power source respectively is used for switching on or off the charge process of the rechargeable cell, the voltage acquiring unit which is connected with the rechargeable cell is used for acquiring the voltage of the rechargeable cell, the control unit controls the on-off of the charge switch according to the voltage of the rechargeable cell and reference voltage, and the voltage of the rechargeable cell is acquired by the voltage acquiring unit. When the utility model is used, the long term effectiveness of the CMOS power supply cell can be ensured so as to ensure the safety of CMOS data. The device has the advantages of simple structure and low cost.
Description
Technical Field
The utility model relates to a computer equipment field, concretely relates to CMOS power supply unit.
Background
When the computer is used, the system configuration data set by the user is usually all stored in the CMOS of the motherboard, and the content includes the time, hardware configuration, setting information, etc. of the computer, and if the information is lost or cleared, the use of the computer may be affected, and if the information is lost or cleared, the stability of the computer-based network system and the use state of important users may be affected.
Generally, in a computer motherboard circuit, a simple circuit is generally used to hold CMOS information, and the circuit is shown in fig. 1:
under the condition of power-on and power-on, the CMOS is directly powered by a system power supply VCC 3-DUAL, the capacitor C1 and the capacitor C2 are filter capacitors, when the system power supply VCC 3-DUAL is powered, the diode D22 is cut off, the diode D23 is powered on to supply power for the CMOS, and the loss of CMOS data cannot be caused at the moment;
in a power-off or non-power-on state, the battery BT supplies power, the diode D22 is conducted, the diode D23 is cut off, and current passes through the R1 of the current-limiting resistor and the diode D22 to supply power for CMOS. The power supply battery generally uses a CR2032 button lithium battery, which is a disposable battery, and the capacity of the battery is reduced after long-term use, and it is eventually difficult to maintain the amount of power required by the CMOS, so that the data stored in the CMOS is lost.
SUMMERY OF THE UTILITY MODEL
An object of the present invention is to overcome the above-mentioned shortcomings of the prior art and to provide a CMOS power supply device to stably maintain the power supply to the CMOS for a long time and ensure the safety of the CMOS data.
Therefore, the utility model provides a following technical scheme:
a CMOS powered device, the device comprising:
the rechargeable battery is used for supplying power to the CMOS when the system is powered off or is not powered on;
the charging power supply is used for providing a regulated power supply for the rechargeable battery when the rechargeable battery needs to be charged;
the charging switch is respectively connected with the rechargeable battery and the charging power supply, when the rechargeable battery needs to be charged, the charging switch is closed, and when the rechargeable battery does not need to be charged, the charging switch is opened;
the voltage acquisition unit is connected with the rechargeable battery and used for acquiring the voltage of the rechargeable battery;
and the input end of the control unit is respectively connected with the voltage acquisition unit and the reference voltage, and the output end of the control unit is connected with the charging switch and used for controlling the charging switch to be switched on or switched off according to the voltage of the rechargeable battery acquired by the voltage acquisition unit and the reference voltage.
Optionally, the control unit comprises:
one input end of the first comparator is connected with the voltage acquisition unit, the other input end of the first comparator provides a first reference voltage for judging whether the rechargeable battery needs to be charged or not, and the first comparator is used for judging whether the rechargeable battery needs to be charged or not according to the voltage of the rechargeable battery obtained by the voltage acquisition unit and the first reference voltage;
and one input end of the second comparator is connected with the output end of the first comparator, the other input end of the second comparator provides a second reference voltage for judging whether the rechargeable battery needs to be stopped to be charged, and the output end of the second comparator is connected with the charging switch and used for controlling the charging switch to be switched on or switched off according to the judgment result of the first comparator and the second reference voltage.
The voltage acquisition unit specifically comprises: and the resistor is connected with the anode of the rechargeable battery and the positive input end of the first comparator.
Optionally, the charging switch is specifically: and a triode.
Optionally, the charging switch is specifically: a relay.
The charging power supply is provided by a +5V direct current power supply on the system mainboard.
Optionally, the rechargeable battery is specifically: CR2032 lithium battery rechargeable battery, or nickel-hydrogen rechargeable battery, or nickel-cadmium rechargeable battery.
Preferably, the apparatus further comprises: and the first reference voltage acquisition circuit is respectively connected with the charging power supply and the negative input end of the first comparator and is used for providing the first reference voltage for the first comparator.
Preferably, the apparatus further comprises: and the second reference voltage acquisition circuit is respectively connected with the charging power supply and the negative input end of the second comparator and is used for providing the second reference voltage for the second comparator.
By the above the technical scheme the utility model provides a can see out, the utility model discloses a rechargeable battery replaces CR2032 disposable battery among the prior art to the CMOS power supply when the computer shuts down or does not add the electricity to charge rechargeable battery through charging circuit. In practical application, the device can automatically charge the electric quantity of the rechargeable battery, the charging circuit is in a full-automatic state, manual intervention is not needed, when the CMOS power supply is detected to be insufficient, the charging process is automatically completed, the long-term effectiveness of the battery is ensured, and the safety of CMOS data is further ensured. The device has simple structure and low cost.
Drawings
FIG. 1 is a schematic diagram of a CMOS information holding circuit on a conventional computer motherboard;
FIG. 2 is a schematic block diagram of the apparatus of the present invention;
FIG. 3 is a block diagram of a control unit in the apparatus of the present invention;
fig. 4 is a wiring diagram of a first embodiment of the present invention;
fig. 5 is a wiring diagram of a second embodiment of the present invention.
Detailed Description
The utility model discloses a core lies in replacing CR2032 disposable battery among the prior art through rechargeable battery to the CMOS power supply when the system does not add the electricity to carry out automatic charging to it according to rechargeable battery's electric quantity. The voltage acquisition unit automatically detects the residual capacity of the rechargeable battery in real time, and the control unit controls the charging switch to be switched on or switched off according to the detected voltage of the rechargeable battery and a preset reference voltage.
In order to make the technical field of the present invention better understand, the present invention is further described in detail with reference to the accompanying drawings and embodiments.
Referring to fig. 2, fig. 2 is a schematic block diagram of the apparatus of the present invention:
the utility model discloses the device includes: a rechargeable battery 21, a voltage acquisition unit 22, a charging switch 23, a control unit 24, and a charging power supply 25. Wherein,
the rechargeable battery 21 is used for supplying power to the CMOS when the system is powered off or not powered on;
the charging power supply 25 is used for providing a regulated power supply for the rechargeable battery when the rechargeable battery needs to be charged;
the charging switch 23 is respectively connected with the rechargeable battery 21 and the charging power supply 25, when the rechargeable battery 21 needs to be charged, the charging switch is closed, and when the rechargeable battery 21 does not need to be charged, the charging switch is opened;
the voltage obtaining unit 22 is connected with the rechargeable battery 21 and is used for obtaining the voltage value of the rechargeable battery;
the input end of the control unit 24 is connected to the voltage obtaining unit 22 and the reference voltage, respectively, and the output end thereof is connected to the charging switch 23, for controlling the charging switch to be turned on or off according to the voltage of the rechargeable battery obtained by the voltage obtaining unit 22 and a predetermined reference voltage.
Fig. 3 shows a block diagram of the control unit:
the control unit includes: a first comparator 31 and a second comparator 32. Wherein,
the positive input end of the first comparator 31 is connected to the voltage obtaining unit 22, and is configured to determine whether the rechargeable battery needs to be charged according to the voltage value of the rechargeable battery obtained by the voltage obtaining unit;
the positive input end of the second comparator 32 is connected to the output end of the first comparator 31, and the output end thereof is connected to the charging switch 23, for controlling the charging switch to be turned on or off according to the judgment result of the first comparator.
When the charging device is used, the voltage acquisition unit acquires the residual capacity of the rechargeable battery in real time, namely acquires the current voltage value of the rechargeable battery, then inputs the value into the first comparator, the first comparator compares the voltage value with a preset reference voltage value (first reference voltage), when the value is smaller than the reference voltage value, the second comparator is informed to supply the power battery to be charged, and after the second comparator receives the notification, the charging switch is controlled to be closed, and the rechargeable battery is charged by the charging power supply.
In the process of charging the battery, the voltage acquisition unit acquires the electric quantity of the rechargeable battery in real time, namely acquires the current voltage value of the rechargeable battery, and then inputs the value into the first comparator. The first comparator outputs the comparison result to the second comparator, the second comparator compares the result with a preset reference voltage value (second reference voltage), if the voltage of the battery exceeds the reference voltage value, the power supply battery needs to stop charging, and the second comparator controls the charging switch to be switched off, so that the charging power supply stops charging the battery.
The first reference voltage required by the first comparator when the battery starts to charge may be directly provided by the system, that is, a power supply meeting the reference voltage value is directly connected to the negative input terminal of the first comparator, or may be obtained by dividing the charging power supply by the first reference voltage obtaining circuit.
The second reference voltage required by the second comparator when the battery stops charging may be directly provided by the system, that is, the power supply meeting the reference voltage value is directly connected to the negative input terminal of the second comparator, or may be obtained by dividing the charging power supply by the second reference voltage obtaining circuit.
The charging switch can adopt switching elements such as a transistor, an MOS transistor, a relay and the like.
The first comparator and the second comparator can be realized by common voltage comparators or by triodes.
The rechargeable battery can be CR2032 lithium battery rechargeable battery, or nickel hydrogen rechargeable battery, or nickel cadmium rechargeable battery.
Fig. 4 is a wiring diagram of the first embodiment of the present invention:
the battery for maintaining the CMOS power is a rechargeable battery BT1, and a resistor R1 connected in series with the battery BT1 plays a role in current limiting. A resistor R2 and a resistor R3 connected in parallel between the battery BT1 and the resistor R1 divide the voltage to obtain the voltage across the battery BT1, and input the obtained voltage to the positive input terminal of the comparator U1 through a resistor R10, and a resistor R11 and a resistor R12 connected in series between the charging power supply VCC DUAL and the ground divide the voltage to obtain the reference voltage of the comparator U1, and input the reference voltage to the negative input terminal of the comparator U1.
The comparator U1 compares the voltage value on the positive input terminal with the voltage on the negative input terminal:
when the battery charge level is reduced to about the minimum holding voltage value (about 0.7V), and the voltage at the positive input end is lower than that at the negative input end (first reference voltage), the comparator U1 outputs a low level, the output end and the voltage fed back by the resistor R6 are input to the positive input end of the comparator U2, and simultaneously, the resistor R8 and the resistor R9 connected between the charging power supply VCCDUAL and the ground in series divide the voltage to form the reference voltage (second reference voltage) of the comparator U2, and input the reference voltage to the negative input end of the comparator U2. At this time, the voltages at the two input terminals of the comparator U2 are compared, the comparator U2 outputs a low level, the transistor Q1 is turned on through the current limiting resistor R4, and the current of the charging power source VCC DUAL supplies power to the battery through the resistors R5 and Q1. C2 is used for filtering.
If the positive input voltage is higher than the negative input voltage, the comparator U1 outputs a high level, and when the high level output by the comparator U1 is higher than the voltage (second reference voltage) at the negative input of the comparator U2, the comparator U2 outputs a high level, the transistor Q1 is turned off, and the battery is stopped being charged.
The charging power VCC DUAL may be provided by a +5V dc power supply on the system motherboard.
The power supply VCC3dual is the power supply for CMOS when the system is powered up, typically +3V dc power on the system board, and the capacitor C1 connected between the power supply and ground performs the filtering function. In order to prevent the system power supply for supplying power to the CMOS and the battery BT1 from affecting each other during power on and power off, the DIODEs DIODE1 and DIODE2 are used for isolating the power supply from each other. When the system is powered on, a power supply VCC3dual is powered on, so that a DIODE DIODE1 is conducted, a DIODE DIODE2 is cut off, and the power supply VCC3dual supplies power for the CMOS; when the system is powered off, the power supply VCC3dual is powered off, so that the DIODE1 is turned off, the DIODE2 is turned on, and the rechargeable battery BT1 supplies power to the CMOS.
Fig. 5 is a wiring diagram of a second embodiment of the present invention:
the battery for maintaining the CMOS power is a rechargeable battery BT1, and a resistor R1 connected in series with the battery BT1 plays a role in current limiting. A resistor R2 and a resistor R3 which are connected between the battery BT1 and the resistor R1 in parallel are divided to obtain a voltage at two ends of the battery BT1, the obtained voltage is input to a negative input end of a comparator U1 through a resistor R5, the resistor R6 and the resistor R7 which are connected between a charging power supply VCC DUAL and the ground in series are divided to obtain a reference voltage of a comparator U1, and the reference voltage is input to a positive input end of the comparator U1.
Comparator U1 is a negative comparator that compares the voltage value at the positive input to the voltage at the negative input:
when the battery power drops to about the minimum holding voltage value (about 0.7V) and the negative input terminal voltage is lower than the positive input terminal voltage, the comparator U1 outputs a high level, at this time, the U1 is turned on, and the transistor U3 (the second comparator) is turned on according to the signal at the output terminal. The current is input to the base input end of the MOS transistor Q2 through the current limiting resistors R4 and R8, so that the base input end of the MOS transistor Q2 generates a potential value, and the MOS transistor Q2 is turned on; the charging power source VCC DUAL charges the rechargeable battery through the current limiting resistor R9.
If the voltage of the negative input end is greater than the voltage of the positive input end, the comparator U1 outputs low level, at the moment, the triode U3 is cut off, the base input end of the MOS transistor Q2 is open, the MOS transistor Q2 is cut off, and the charging power supply VCC DUAL stops charging the rechargeable battery.
The charging power VCC DUAL may be provided by a +5V dc power supply on the system motherboard.
The power supply VCC3dual is a power supply for CMOS when the system is powered on, usually +3V dc power supply on the system motherboard, and the capacitor C1 connected between the power supply and ground plays a role in filtering. In order to prevent the system power supply for supplying power to the CMOS and the battery BT1 from affecting each other during power on and power off, the DIODEs DIODE1 and DIODE2 are used for isolating the power supply from each other. When the system is powered on, a power supply VCC3dual is powered on, so that a DIODE DIODE1 is turned on, a DIODE DIODE2 is turned off, and a system power supply VCC3dual supplies power to the CMOS; when the system is powered off, the power supply VCC3dual is powered off, so that the DIODE1 is turned off, the DIODE2 is turned on, and the rechargeable battery BT1 supplies power to the CMOS.
Although the present invention has been described in terms of embodiments, those skilled in the art will recognize that there are numerous variations and modifications of the present invention without departing from the spirit of the invention, and it is intended that the appended claims encompass such variations and modifications without departing from the spirit of the invention.
Claims (9)
1. A CMOS powered device, the device comprising:
the rechargeable battery is used for supplying power to the CMOS when the system is powered off or is not powered on;
the charging power supply is used for providing a regulated power supply for the rechargeable battery when the rechargeable battery needs to be charged;
the charging switch is respectively connected with the rechargeable battery and the charging power supply, when the rechargeable battery needs to be charged, the charging switch is closed, and when the rechargeable battery does not need to be charged, the charging switch is opened;
the voltage acquisition unit is connected with the rechargeable battery and used for acquiring the voltage of the rechargeable battery;
and the input end of the control unit is respectively connected with the voltage acquisition unit and the reference voltage, and the output end of the control unit is connected with the charging switch and used for controlling the charging switch to be switched on or switched off according to the voltage of the rechargeable battery acquired by the voltage acquisition unit and the reference voltage.
2. The apparatus of claim 1, wherein the control unit comprises:
one input end of the first comparator is connected with the voltage acquisition unit, the other input end of the first comparator provides a first reference voltage for judging whether the rechargeable battery needs to be charged or not, and the first comparator is used for judging whether the rechargeable battery needs to be charged or not according to the voltage of the rechargeable battery obtained by the voltage acquisition unit and the first reference voltage;
and one input end of the second comparator is connected with the output end of the first comparator, the other input end of the second comparator provides a second reference voltage for judging whether the rechargeable battery needs to be stopped to be charged, and the output end of the second comparator is connected with the charging switch and used for controlling the charging switch to be switched on or switched off according to the judgment result of the first comparator and the second reference voltage.
3. The apparatus according to claim 2, wherein the voltage obtaining unit is specifically: and the resistor is connected with the anode of the rechargeable battery and the positive input end of the first comparator.
4. The device according to claim 1, characterized in that the charging switch is in particular: and a triode.
5. The device according to claim 1, characterized in that the charging switch is in particular: a relay.
6. The apparatus of claim 1, wherein the charging power is provided by a +5V dc power supply on the system motherboard.
7. The device according to claim 1, characterized in that the rechargeable battery is in particular:
CR2032 lithium battery rechargeable battery, or nickel-hydrogen rechargeable battery, or nickel-cadmium rechargeable battery.
8. The apparatus of any of claims 2 to 7, further comprising:
and the first reference voltage acquisition circuit is respectively connected with the charging power supply and the negative input end of the first comparator and is used for providing the first reference voltage for the first comparator.
9. The apparatus of any of claims 2 to 7, further comprising:
and the second reference voltage acquisition circuit is respectively connected with the charging power supply and the negative input end of the second comparator and is used for providing the second reference voltage for the second comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520005972 CN2800360Y (en) | 2005-03-15 | 2005-03-15 | CMOS power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520005972 CN2800360Y (en) | 2005-03-15 | 2005-03-15 | CMOS power supply device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2800360Y true CN2800360Y (en) | 2006-07-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520005972 Expired - Fee Related CN2800360Y (en) | 2005-03-15 | 2005-03-15 | CMOS power supply device |
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| CN (1) | CN2800360Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101576764B (en) * | 2008-10-10 | 2011-06-22 | 鸿富锦精密工业（深圳）有限公司 | CMOS data clear circuit |
| CN109494838A (en) * | 2018-12-14 | 2019-03-19 | 常州格力博有限公司 | Charge output protection circuit and charging output protection method |
| CN109756004A (en) * | 2019-03-22 | 2019-05-14 | 苏州浪潮智能科技有限公司 | A kind of server and its charging unit and method |
| CN110011386A (en) * | 2019-05-08 | 2019-07-12 | 四川莱福德科技有限公司 | Battery charger and charger |
-
2005
- 2005-03-15 CN CN 200520005972 patent/CN2800360Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101576764B (en) * | 2008-10-10 | 2011-06-22 | 鸿富锦精密工业（深圳）有限公司 | CMOS data clear circuit |
| CN109494838A (en) * | 2018-12-14 | 2019-03-19 | 常州格力博有限公司 | Charge output protection circuit and charging output protection method |
| CN109756004A (en) * | 2019-03-22 | 2019-05-14 | 苏州浪潮智能科技有限公司 | A kind of server and its charging unit and method |
| CN110011386A (en) * | 2019-05-08 | 2019-07-12 | 四川莱福德科技有限公司 | Battery charger and charger |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |