CN114977361A - Power supply circuit and panel terminal of dual supply double cell - Google Patents
Power supply circuit and panel terminal of dual supply double cell Download PDFInfo
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- CN114977361A CN114977361A CN202210164507.5A CN202210164507A CN114977361A CN 114977361 A CN114977361 A CN 114977361A CN 202210164507 A CN202210164507 A CN 202210164507A CN 114977361 A CN114977361 A CN 114977361A
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- 239000003990 capacitor Substances 0.000 claims description 36
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- 238000010586 diagram Methods 0.000 description 5
- 101100298412 Arabidopsis thaliana PCMP-H73 gene Proteins 0.000 description 3
- 101000908580 Homo sapiens Spliceosome RNA helicase DDX39B Proteins 0.000 description 3
- 102100024690 Spliceosome RNA helicase DDX39B Human genes 0.000 description 3
- 101150096366 pep7 gene Proteins 0.000 description 3
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/342—The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a power supply circuit of a double-power-supply double battery and a panel terminal, wherein the circuit comprises a charging module, a power supply switching circuit, a first power supply, a second power supply, a battery switching circuit, a first battery and a second battery; the power supply switching circuit is respectively connected with the first power supply and the second power supply, and when the voltage of the first power supply is greater than a preset voltage value, the power supply switching circuit outputs the voltage of the first power supply; the battery switching circuit is respectively connected with the first battery and the second battery, and outputs the voltage of the first battery when the first battery is larger than a preset voltage value; the charging module is respectively connected with the output end of the power supply switching circuit and the output end of the battery switching circuit, and when the output end of the power supply switching circuit is larger than a preset voltage value, the charging module outputs the voltage of the output end of the power supply switching circuit. The power supply mode is flexible, and long-time endurance of the flat panel terminal outdoors is realized.
Description
Technical Field
The invention relates to the field of power supply circuits, in particular to a dual-power-supply dual-battery power supply circuit and a flat panel terminal.
Background
With the continuous development of computers, most of the existing portable terminals adopt a mode of adding a single battery and a single adapter, when the electric quantity of the battery is exhausted, only the access adapter can be used continuously, although the terminal is light and convenient, the terminal is not suitable for being used outdoors for a long time, and in special industries, the endurance of the operation terminal is particularly important due to the long-time outdoor use.
Disclosure of Invention
The invention mainly aims to provide a power supply circuit with double power supplies and double batteries and a flat terminal, which can realize long-time outdoor endurance of the flat terminal.
In order to achieve the above object, the present invention provides a power supply circuit for dual power supply dual batteries, comprising: the charging device comprises a charging module, a power supply switching circuit, a first power supply input end, a second power supply input end, a battery switching circuit, a first battery and a second battery;
the power supply switching circuit is respectively connected with the first power supply input end and the second power supply input end, when the first power supply input end is higher than a first preset voltage value, the power supply switching circuit outputs the voltage of the first power supply input end, and when the voltage of the first power supply input end is lower than or equal to the first preset voltage value, the power supply switching circuit outputs the voltage of the second power supply input end;
the battery switching circuit is respectively connected with the first battery and the second battery, when the first battery is higher than a second preset voltage value, the battery switching circuit outputs the voltage of the first battery, and when the voltage of the first battery is lower than or equal to the second preset voltage value, the battery switching circuit outputs the voltage of the second battery;
the charging module is respectively connected with the output end of the power supply switching circuit and the output end of the battery switching circuit, when the voltage of the output end of the power supply switching circuit is higher than a third preset voltage value, the charging module outputs the voltage of the output end of the power supply switching circuit and controls the battery switching circuit to be switched off, and when the voltage of the output end of the power supply switching circuit is lower than or equal to the third preset voltage value, the charging module outputs the voltage of the output end of the battery switching circuit.
Optionally, the power supply circuit of dual-power-supply dual-battery further includes a control circuit, an input end of the control circuit is connected with the first battery and the second battery respectively, an output end of the control circuit is connected with the charging module, the charging module is further connected with the first battery and the second battery respectively, when an output end of the power switching circuit is used, the control circuit is used for detecting electric quantity of the first battery and the second battery, and the charging module is controlled to charge the first battery or the second battery according to the electric quantity of the first battery and the second battery.
Optionally, the power supply circuit of the dual power supply dual battery further includes an EEPROM module, and the EEPROM module is connected to the control circuit.
Optionally, the battery switching circuit includes a first chip, a first MOS transistor, a second MOS transistor, a third MOS transistor and a fourth MOS transistor, where the first MOS transistor, the second MOS transistor, the third MOS transistor and the fourth MOS transistor are P-type MOS transistors, a source of the first MOS transistor is connected to the first battery, a drain of the first MOS transistor is connected to a drain of the second MOS transistor, a gate of the first MOS transistor is connected to a gate of the second MOS transistor, respectively, a source of the third MOS transistor is connected to the second battery, a drain of the third MOS transistor is connected to a drain of the fourth MOS transistor, a gate of the third MOS transistor is connected to a gate of the fourth MOS transistor, respectively, a source of the second MOS transistor is connected to a source of the fourth MOS transistor, which is an output end of the battery switching circuit, and the first chip is connected to a drain of the first MOS transistor, a drain of the second MOS transistor, a source of the third MOS transistor, and a source of the fourth MOS transistor, respectively, And the drain electrode of the second MOS tube, the drain electrode of the third MOS tube and the drain electrode of the fourth MOS tube are connected.
Optionally, the power switching circuit includes a second chip, a fifth MOS transistor, a sixth MOS transistor, a seventh MOS transistor and an eighth MOS transistor, where the fifth MOS transistor, the sixth MOS transistor, the seventh MOS transistor and the eighth MOS transistor are P-type MOS transistors, a source of the fifth MOS transistor is connected to the first power supply, a drain of the fifth MOS transistor is connected to a drain of the sixth MOS transistor, a gate of the fifth MOS transistor is connected to a gate of the sixth MOS transistor, respectively, a source of the seventh MOS transistor is connected to the second power supply, a drain of the seventh MOS transistor is connected to a drain of the eighth MOS transistor, a gate of the seventh MOS transistor is connected to a gate of the eighth MOS transistor, respectively, a source of the sixth MOS transistor is connected to a source of the eighth MOS transistor, and is an output end of the power switching circuit, and the second chip is connected to a drain of the fifth MOS transistor, a drain of the seventh MOS transistor, and a gate of the eighth MOS transistor, respectively, And the drain electrode of the sixth MOS tube, the drain electrode of the seventh MOS tube and the drain electrode of the eighth MOS tube are connected.
Optionally, the charging module includes a battery charging circuit and a charging switch circuit, an input end of the charging switch circuit is connected to an output end of the battery charging circuit, and an output end of the charging switch circuit is connected to the first battery and the second battery respectively.
Optionally, the battery charging circuit includes a third chip, a ninth MOS transistor, a tenth MOS transistor and an eleventh MOS transistor, the ninth MOS transistor, the tenth MOS transistor and the eleventh MOS transistor are P-type MOS transistors, the third chip includes a charging detection pin, a charging control pin, a first voltage control pin and a second voltage control pin, the charging detection pin is connected to the output terminal of the power switching circuit, the gate of the ninth MOS transistor is connected to the charging control pin, the drain of the ninth MOS transistor is connected to the output terminal of the power switching circuit, respectively, the output terminal of the battery charging circuit is the output terminal of the charging module, the gate of the tenth MOS transistor is connected to the first voltage control pin, the drain of the tenth MOS transistor is grounded, the source of the tenth MOS transistor is connected to the source of the eleventh MOS transistor, the grid electrode of the eleventh MOS tube is connected with the second voltage control pin, and the source electrode of the eleventh MOS tube is connected with the drain electrode of the ninth MOS tube.
Optionally, the charging switch circuit includes a twelfth MOS transistor, a thirteenth MOS transistor, a fourteenth MOS transistor, a fifteenth MOS transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor, where the twelfth MOS transistor, the thirteenth MOS transistor, the fourteenth MOS transistor, and the fifteenth MOS transistor are P-type MOS transistors, a drain of the twelfth MOS transistor is connected to a first end of the first capacitor and a first end of the first resistor, respectively, and is an input end of the charging switch circuit, a gate of the twelfth MOS transistor is connected to a second end of the first capacitor, a second end of the first resistor, and a first end of the second resistor, respectively, and a source of the twelfth MOS transistor is connected to a source of the thirteenth MOS transistor, a drain of the thirteenth MOS transistor is connected to the first end of the second capacitor, the first end of the third resistor, and the first battery, a gate of the thirteenth MOS transistor is connected to the second end of the second capacitor, the second end of the third resistor, and the first end of the fourth resistor, a second end of the second resistor is connected to the second end of the fourth resistor and the control circuit, a drain of the fourteenth MOS transistor is connected to the first end of the third capacitor and the first end of the fifth resistor, and is an input end of the charging switch circuit, a gate of the fourteenth MOS transistor is connected to the second end of the third capacitor, the second end of the fifth resistor, and the first end of the sixth resistor, a source of the fourteenth MOS transistor is connected to a source of the fifteenth MOS transistor, and a drain of the fifteenth MOS transistor is connected to the first end of the fourth capacitor, the second end of the fifth resistor, and the first end of the sixth resistor, respectively, The first end of the seventh resistor is connected with the second battery, the grid electrode of the fifteenth MOS transistor is respectively connected with the second end of the fourth capacitor, the second end of the seventh resistor and the first end of the eighth resistor, and the second end of the sixth resistor is respectively connected with the second end of the eighth resistor and the control circuit.
The invention provides a panel terminal which comprises a panel main body and the power supply circuit of the double power supply double batteries, wherein the power supply circuit of the double power supply double batteries is arranged on the panel main body.
Optionally, the tablet main body is provided with a docking station, the docking station is of a bracket structure and is provided with a mounting hole for fixing on the vehicle frame.
According to the invention, the charging module, the power supply switching circuit, the first power supply, the second power supply, the battery switching circuit, the first battery and the second battery are arranged, the power supply switching circuit is respectively connected with the first power supply input end and the second power supply input end, the battery switching circuit is respectively connected with the first battery and the second battery, and the charging module is respectively connected with the output end of the power supply switching circuit and the output end of the battery switching circuit; when the voltage of the output end of the power supply switching circuit is higher than a third preset voltage value, the charging module outputs the voltage of the output end of the power supply switching circuit and controls the battery switching circuit to be switched off, and when the voltage of the output end of the power supply switching circuit is lower than or equal to the third preset voltage value, the charging module outputs the voltage of the output end of the battery switching circuit. When the charging module works, the first preset voltage value, the second preset voltage value and the third preset voltage value are set to be close to zero, the battery switching circuit preferably outputs the voltage of the first battery, when only the second battery has voltage input, the battery switching circuit outputs the voltage of the second battery, the power switching circuit preferably outputs the voltage of the first power input end, when only the second power input end has voltage input, the power switching circuit outputs the voltage of the second power input end, the charging module preferably outputs the voltage of the power switching circuit, when only the output end of the battery switching circuit has voltage, the charging module outputs the voltage of the output end of the battery switching circuit, and when the output end of the power switching circuit has voltage, the charging module outputs the voltage of the output end of the power switching circuit and turns off the output of the battery switching circuit. Compared with the flat panel terminal in the background art, the power supply circuit is arranged, so that the power supply mode of the flat panel terminal is more flexible, and the long-time outdoor endurance of the flat panel terminal is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of an embodiment of a dual power supply circuit according to the present invention;
FIG. 2 is a circuit diagram of an embodiment of the battery switch circuit of FIG. 1;
FIG. 3 is a schematic circuit diagram of an embodiment of the power switching circuit of FIG. 1;
FIG. 4 is a schematic circuit diagram illustrating an embodiment of a battery charging circuit in the charging module of FIG. 1;
fig. 5 is a schematic circuit structure diagram of an embodiment of a charging switch circuit in the charging module in fig. 1.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | Charging module | 11 | |
| 12 | |
20 | |
| 21 | |
22 | |
| 30 | Power supply switching circuit | 31 | A first power |
| 32 | Second power |
40 | Control circuit |
| R1-R8 | First to eighth resistors | C1-C4 | First capacitor-fourth capacitor |
| Q1-Q15 | First MOS transistor-fifteenth MOS transistor | U1-U3 | First chip-third chip |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a power supply circuit with double power supplies and double batteries, which is used for supplying power to a panel terminal.
The existing flat terminal is single in power supply mode and not beneficial to long-time outdoor endurance of the flat terminal.
Referring to fig. 1, in an embodiment of the present invention, the power supply circuit of the dual power supply dual battery includes: the charging module 10, the power supply switching circuit 30, the first power supply input terminal 31, the second power supply input terminal 32, the battery switching circuit 20, the first battery 21 and the second battery 22;
the power switching circuit 30 is respectively connected to the first power input terminal 31 and the second power input terminal 32, when the first power input terminal 31 is higher than a first preset voltage value, the power switching circuit 30 outputs the voltage of the first power input terminal 31, and when the voltage of the first power input terminal 31 is lower than or equal to the first preset voltage value, the power switching circuit outputs the voltage of the second power input terminal 32;
the battery switching circuit 20 is respectively connected to the first battery 21 and the second battery 22, when the first battery 21 is higher than a second preset voltage value, the battery switching circuit 20 outputs the voltage of the first battery 21, and when the voltage of the first battery 21 is lower than or equal to the second preset voltage value, the battery switching circuit 20 outputs the voltage of the second battery 22;
the charging module 10 is respectively connected with the output end of the power switching circuit 30 and the output end of the battery switching circuit 20, when the voltage of the output end of the power switching circuit 30 is higher than a third preset voltage value, the charging module 10 outputs the voltage of the output end of the power switching circuit 30 and controls the battery switching circuit 20 to be switched off, and when the voltage of the output end of the power switching circuit 30 is lower than or equal to the third preset voltage value, the charging module 10 outputs the voltage of the output end of the battery switching circuit 20.
Specifically, the first preset voltage value, the second preset voltage value and the third preset voltage value are all set to be close to zero, the battery switching circuit 20 preferably outputs the voltage of the first battery 21, the power switching circuit 30 preferably outputs the voltage of the first power input terminal 31, and the charging module 10 preferably outputs the voltage output by the power switching circuit 30.
In the present embodiment, the first power input terminal 31 and the second power input terminal 32 are used for connecting an external power source, the power switching circuit 30 is used for switching the voltage of the first power input terminal 31 and the voltage of the second power input terminal 32, the preference level of the first power input terminal 31 is higher than that of the second power input terminal 32, the power switching circuit 30 outputs the voltage of the first power input terminal 31 when there is a voltage input at both the first power input terminal 31 and the second power input terminal 32, and the power switching circuit 30 outputs the voltage of the second power input terminal 32 when there is a voltage input at only the second power input terminal 32.
The first battery 21 and the second battery 22 are voltage sources inside the power supply circuit, the battery switching circuit 20 is used for switching the voltage of the first battery 21 and the voltage of the second battery 22, the preference level of the first battery 21 is higher than that of the second battery 22, when both the first battery 21 and the second battery 22 have voltage input, the battery switching circuit 20 outputs the voltage of the first battery 21, and when only the second battery 22 has voltage input, the battery switching circuit 20 outputs the voltage of the second battery 22.
The charging module 10 is configured to switch a voltage of the power switching circuit 30 and a voltage of the battery switching circuit 20, the power switching circuit 30 has a higher preference level than the battery switching circuit 20, when there is a voltage input at both an output terminal of the power switching circuit 30 and an output terminal of the battery switching circuit 20, the charging module 10 outputs the voltage at the output terminal of the power switching circuit 30 and turns off the output of the battery switching circuit 20, and when there is a voltage input only at the battery switching circuit 20, the charging module 10 outputs the voltage at the output terminal of the battery switching circuit 20.
The working principle of the present embodiment is that the charging module 10 preferably outputs the voltage of the power switching circuit 30, that is, when the external power is connected, the external power is used to supply power, the power supply channel of the battery is turned off, and the electric quantity of the battery is saved. When the external power supply is connected for supplying power, the first power input end 31 is a main power supply end, and the second power input end 32 is a standby power supply end, so that the situation that the power supply circuit cannot be connected with the external power supply for supplying power when the first power input end 31 is damaged is avoided. When the batteries are used for supplying power, the first battery 21 is a main power supply battery, the second battery 22 is a standby power supply battery, when the first battery 21 is damaged, the second battery 22 is used for supplying power, the first battery 21 is detached and maintained, and the panel terminal can maintain work when the first battery 21 is detached and maintained.
In operation, the battery switching circuit 20 preferably outputs the voltage of the first battery 21, when only the voltage of the second battery 22 is input, the battery switching circuit 20 outputs the voltage of the second battery 22, the power switching circuit 30 preferably outputs the voltage of the first power input terminal 31, when only the voltage of the second power input terminal 32 is input, the power switching circuit 30 outputs the voltage of the second power input terminal 32, the charging module 10 preferably outputs the voltage of the power switching circuit 30, when only the voltage of the output terminal of the battery switching circuit 20 is input, the charging module 10 outputs the voltage of the output terminal of the battery switching circuit 20, when the voltage of the output terminal of the power switching circuit 30 is input, the charging module 10 outputs the voltage of the output terminal of the power switching circuit 30, and turns off the output of the battery switching circuit 20.
According to the invention, by arranging the charging module 10, the power supply switching circuit 30, the first power supply, the second power supply, the battery switching circuit 20, the first battery 21 and the second battery 22, the power supply switching circuit 30 is respectively connected with the first power supply input end 31 and the second power supply input end 32, the battery switching circuit 20 is respectively connected with the first battery 21 and the second battery 22, and the charging module 10 is respectively connected with the output end of the power supply switching circuit 30 and the output end of the battery switching circuit 20; when the first power input terminal 31 is higher than the first predetermined voltage value, the power switching circuit 30 outputs the voltage of the first power input terminal 31, when the voltage at the first power input terminal 31 is lower than or equal to a first preset voltage value, the voltage at the second power input terminal 32 is output, when the first battery 21 is higher than the second preset voltage value, the battery switching circuit 20 outputs the voltage of the first battery 21, when the voltage of the first battery 21 is lower than or equal to a second preset voltage value, the voltage of the second battery 22 is output, when the voltage at the output terminal of the power switching circuit 30 is higher than the third preset voltage value, the charging module 10 outputs the voltage at the output terminal of the power switching circuit 30, and controls the battery switching circuit 20 to turn off, when the voltages at the output terminals of the power switching circuits 30 are all lower than or equal to the third preset voltage value, the charging module 10 outputs the voltage at the output terminal of the battery switching circuit 20. In operation, the first preset voltage value, the second preset voltage value and the third preset voltage value are all set to be close to zero, the battery switching circuit 20 preferably outputs the voltage of the first battery 21, when there is a voltage input to only the second battery 22, the battery switching circuit 20 outputs the voltage of the second battery 22, the power switching circuit 30 preferably outputs the voltage of the first power input terminal 31, when there is only voltage input at the second power input terminal 32, the power switching circuit 30 outputs the voltage at the second power input terminal 32, the charging module 10 preferably outputs the voltage at the power switching circuit 30, when there is a voltage only at the output terminal of the battery switching circuit 20, the charging module 10 outputs the voltage at the output terminal of the battery switching circuit 20, when there is a voltage at the output terminal of the power switching circuit 30, the charging module 10 outputs the voltage at the output terminal of the power switching circuit 30, and turns off the output of the battery switching circuit 20. Compared with the flat panel terminal in the background art, the power supply circuit is arranged, so that the power supply mode of the flat panel terminal is more flexible, and the long-time outdoor endurance of the flat panel terminal is realized.
Referring to fig. 1, in an embodiment, the power supply circuit of dual power supply batteries further includes a control circuit 40, an input end of the control circuit 40 is connected to the first battery 21 and the second battery 22, an output end of the control circuit 40 is connected to the charging module 10, the charging module 10 is further connected to the first battery 21 and the second battery 22, and at an output end of the power switching circuit 30, the control circuit 40 is configured to detect electric quantities of the first battery 21 and the second battery 22, and control the charging module 10 to charge the first battery 21 or the second battery 22 according to the electric quantities of the first battery 21 and the second battery 22.
In this embodiment, when the charging module 10 outputs the voltage at the output end of the power switching circuit 30, that is, when the charging module 10 is powered by an external power source, the charging module 10 turns off the output of the battery switching circuit 20, that is, turns off the outputs of the first battery 21 and the second battery 22, the charging module 10 charges the first battery 21 or the second battery 22, the first battery 21 and the second battery 22 mainly transmit information through the SMB bus and the first battery 21 and the second battery 22, the control circuit 40 reads information such as the battery ID of the power and the temperature, the control circuit 40 selects one of the first battery 21 or the second battery 22 to supply power according to the read information such as the battery ID of the power and the temperature, and the logic for controlling the charging module 10 to charge the first battery 21 or the second battery 22 by the control circuit 40 may be arbitrarily set.
Referring to fig. 1, the power supply circuit of the dual power supply dual battery further includes an EEPROM module, and the EEPROM module is connected to the control circuit 40.
In the present embodiment, the EEPROM module is used to provide the basic firmware for the embedded controller in the control circuit 40 to run, and the logic for controlling the charging module 10 to charge the battery is updated by the EEPROM module to update the firmware modification of the control module.
Referring to fig. 2, in an embodiment, the battery switching circuit 20 includes a first chip U1, a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3 and a fourth MOS transistor Q4, the first MOS transistor Q1, the second MOS transistor Q2, the third MOS transistor Q3 and the fourth MOS transistor Q4 are P-type MOS transistors, a source of the first MOS transistor Q1 is connected to the first battery 21, a drain of the first MOS transistor Q1 is connected to a drain of the second MOS transistor Q2, gates of the first MOS transistor Q1 are respectively connected to a gate of the second MOS transistor Q2, a source of the third MOS transistor Q3 is connected to the second battery 22, a drain of the third MOS transistor Q3 is connected to a drain of the fourth MOS transistor Q4, a gate of the third MOS transistor Q3 is respectively connected to a gate of the fourth MOS transistor Q4, a source of the fourth MOS transistor Q2 and a source of the fourth MOS transistor Q4, for the output end of the battery switching circuit 20, the first chip U1 is respectively connected to the drain electrode of the first MOS transistor Q1, the drain electrode of the second MOS transistor Q2, the drain electrode of the third MOS transistor Q3 and the drain electrode of the fourth MOS transistor Q4.
In this embodiment, the first chip U1 is a converter chip, the model is LTC4417UF, BAT1 is used to connect the first battery 21, BAT2 is used to connect the second battery 22, VBAT is the output end of the battery switching circuit 20, the first chip U1 is provided with a first preset voltage value, when the first chip U1 detects that the voltage at the BAT1 end is greater than the first preset voltage value, the first MOS transistor Q1 and the second MOS transistor Q2 are controlled to be turned off, the third MOS transistor Q3 and the fourth MOS transistor Q4 are controlled to be turned on, and VBAT outputs the voltage of BAT 1; when the first chip U1 detects that the voltage at the BAT1 end is less than or equal to a first preset voltage value, the first MOS transistor Q1 and the second MOS transistor Q2 are controlled to be turned on, the third MOS transistor Q3 and the fourth MOS transistor Q4 are controlled to be turned off, and VBAT outputs the voltage of BAT 2.
Referring to fig. 3, in an embodiment, the power switching circuit 30 includes a second chip U2, a fifth MOS transistor Q5, a sixth MOS transistor Q6, a seventh MOS transistor Q7 and an eighth MOS transistor Q8, the fifth MOS transistor Q5, the sixth MOS transistor Q6, the seventh MOS transistor Q7 and the eighth MOS transistor Q8 are P-type MOS transistors, a source of the fifth MOS transistor Q5 is connected to the first power supply, a drain of the fifth MOS transistor Q5 is connected to a drain of the sixth MOS transistor Q6, gates of the fifth MOS transistor Q5 are respectively connected to the gate of the sixth MOS transistor Q6, a source of the seventh MOS transistor Q7 is connected to the second power supply, a drain of the seventh MOS transistor Q7 is connected to the drain of the eighth MOS transistor Q8, a gate of the seventh MOS transistor Q7 is respectively connected to the gate of the eighth MOS transistor Q8, a source of the sixth MOS transistor Q49328 is connected to the gate of the eighth MOS transistor Q6, and a source of the eighth MOS transistor Q8 is connected to the switching circuit, the second chip U2 is respectively connected to the drain of the fifth MOS transistor Q5, the drain of the sixth MOS transistor Q6, the drain of the seventh MOS transistor Q7 and the drain of the eighth MOS transistor Q8.
In this embodiment, the second chip U2 is a converter chip, the model is LTC4417UF, VAC1 is the first power input terminal 31, VAC2 is the second power input terminal 32, VACIN is the output terminal of the power switching circuit 30, the second chip U2 has a second preset voltage value, when the second chip U2 detects that the voltage at the VAC1 terminal is greater than the first preset voltage value, the fifth MOS transistor Q5 and the sixth MOS transistor Q6 are controlled to be turned off, the seventh MOS transistor Q7 and the eighth MOS transistor Q8 are controlled to be turned on, and the VACIN outputs the voltage of the VAC 1; when the second chip U2 detects that the voltage at the VAC1 end is less than or equal to a second preset voltage value, the fifth MOS tube Q5 and the sixth MOS tube Q6 are controlled to be connected, the seventh MOS tube Q7 and the eighth MOS tube Q8 are controlled to be disconnected, and the VACIN outputs the voltage of VAC 2.
Referring to fig. 4 and 5, in an embodiment, the charging module 10 includes a battery charging circuit 11 and a charging switch circuit 12, an input terminal of the charging switch circuit 12 is connected to an output terminal of the battery charging circuit 11, and an output terminal of the charging switch circuit 12 is connected to the first battery 21 and the second battery 22, respectively.
In this embodiment, the control circuit 40 controls the battery charging circuit 11 to set a charging voltage of the battery, where the set charging voltage is an input terminal of the charging switch circuit 12, and the control circuit 40 controls the charging switch circuit 12 to select the charging module 10 to charge the first battery 21 or the second battery 22.
Referring to fig. 4, in an embodiment, the battery charging circuit 11 includes a third chip U3, a ninth MOS transistor Q9, a tenth MOS transistor Q10 and an eleventh MOS transistor Q11, the ninth MOS transistor Q9, the tenth MOS transistor Q10 and the eleventh MOS transistor Q11 are P-type MOS transistors, the third chip U3 includes a charging detection pin, a charging control pin, a first voltage control pin and a second voltage control pin, the charging detection pin is connected to the output terminal of the power switching circuit 30, the gate of the ninth MOS transistor Q9 is connected to the charging control pin, the drains of the ninth MOS transistor Q9 are respectively connected to the output terminal of the power switching circuit 30, the output terminal of the battery charging circuit 11 is the output terminal of the battery charging circuit 11, the gate of the tenth MOS transistor Q10 is connected to the first voltage control pin, the drain of the tenth MOS transistor Q10 is grounded, the source of the tenth MOS transistor Q10 is connected to the source of the eleventh MOS transistor, the gate of the eleventh MOS transistor Q11 is connected to the second voltage control pin, and the source of the eleventh MOS transistor Q11 is connected to the drain of the ninth MOS transistor Q9.
In this embodiment, a third preset voltage value is preset on the third chip U3, VSYS is an output terminal of the charging module 10, AC _ OK is used to detect a voltage at the output terminal of the power switching circuit 30, and when it is detected that the voltage at the output terminal of the power switching circuit 30 is greater than the third preset voltage value, the ninth MOS transistor Q9 is controlled to be turned off, and the VSYS terminal voltage is a VACIN terminal voltage, that is, the voltage at the output terminal of the power switching circuit 30 is output; when the voltage at the output end of the power switching circuit 30 is detected to be less than or equal to the third preset voltage value, the ninth MOS transistor Q9 is controlled to be turned on, and the VSYS terminal voltage outputs a VBAT terminal voltage, that is, the voltage at the output end of the battery switching circuit 20 is output, and at this time, the VACIN terminal voltage is very small, which does not affect the output of VSYS.
The voltage at the VCGH terminal is the voltage for charging the battery, EC _ CLK and EC _ DATA are used for connecting the control circuit 40, and when the ninth MOS transistor Q9 is turned off, the control circuit 40 controls the tenth MOS transistor Q10 and the eleventh MOS transistor Q11 to be turned on and off through the third chip U3, so as to change the voltage value at the VCGH terminal.
Referring to fig. 5, in an embodiment, the charging switch circuit 12 includes a twelfth MOS transistor Q12, a thirteenth MOS transistor Q13, a fourteenth MOS transistor Q14, a fifteenth MOS transistor Q15, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4, where the twelfth MOS transistor Q12, the thirteenth MOS transistor Q13, the fourteenth MOS transistor Q14, and the fifteenth MOS transistor Q14 are P-type MOS transistors, a drain of the twelfth MOS transistor Q14 is respectively connected to a first end of the first capacitor C14 and a first end of the first resistor R14, and a drain of the twelfth MOS transistor Q14 is respectively connected to a gate of the first resistor R14 and a second end of the second resistor R14, a source of the twelfth MOS transistor Q12 is connected to a source of the thirteenth MOS transistor Q13, a drain of the thirteenth MOS transistor Q13 is connected to the first end of the second capacitor C2, the first end of the third resistor R3 and the first battery 21, a gate of the thirteenth MOS transistor Q13 is connected to the second end of the second capacitor C2, the second end of the third resistor R3 and the first end of the fourth resistor R4, a second end of the second resistor R2 is connected to the second end of the fourth resistor R4 and the control circuit 40, a drain of the fourteenth MOS transistor Q14 is connected to the first end of the third capacitor C3 and the first end of the fifth resistor R5, and a gate of the fourteenth MOS transistor Q14 is connected to the second end of the third capacitor C3, the second end of the fifth resistor R5 and the second end of the sixth resistor R6, a source of the fourteenth MOS transistor Q14 is connected to a source of the fifteenth MOS transistor Q15, a drain of the fifteenth MOS transistor Q15 is connected to the first end of the fourth capacitor C4, the first end of the seventh resistor R7 and the second battery 22, respectively, a gate of the fifteenth MOS transistor Q15 is connected to the second end of the fourth capacitor C4, the second end of the seventh resistor R7 and the first end of the eighth resistor R8, respectively, and a second end of the sixth resistor R6 is connected to the second end of the eighth resistor R8 and the control circuit 40, respectively.
In the present embodiment, EC _1 and EC _2 are used to connect the control circuit 40, EC _1 is used to control the conduction of the twelfth MOS transistor Q12 and the thirteenth MOS transistor Q13, the charging module 10 is used to charge the first battery 21, EC _2 is used to control the conduction of the fourteenth MOS transistor Q14 and the fifteenth MOS transistor Q15, and the charging module 10 is used to charge the second battery 22.
The invention provides a tablet terminal.
The specific structure of the power supply circuit of the dual-power-supply dual-battery is as described in the above embodiments, and the power supply device of the present invention adopts all the technical solutions of all the above embodiments, so that the power supply device at least has all the beneficial effects brought by the technical solutions of the above embodiments, and further description is omitted here, and the power supply circuit of the dual-power-supply dual-battery is disposed in the tablet main body.
In one embodiment, the tablet main body is provided with a docking station, which is a bracket structure and is provided with a mounting hole for fixing on a vehicle frame.
In this embodiment, the docking station may not only serve as an extension of its functions, but also function as a fixed terminal.
The structure of docking station is designed into the shape of support to be furnished with the pilot hole, can the snap-on the frame, when the terminal needs on-vehicle, the terminal direct assembly is to fixed docking station on, when on-vehicle reaching, the stable effect in terminal.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A power supply circuit of a dual power supply dual battery, comprising: the charging device comprises a charging module, a power supply switching circuit, a first power supply input end, a second power supply input end, a battery switching circuit, a first battery and a second battery;
the power supply switching circuit is respectively connected with the first power supply input end and the second power supply input end, when the first power supply input end is higher than a first preset voltage value, the power supply switching circuit outputs the voltage of the first power supply input end, and when the voltage of the first power supply input end is lower than or equal to the first preset voltage value, the power supply switching circuit outputs the voltage of the second power supply input end;
the battery switching circuit is respectively connected with the first battery and the second battery, when the first battery is higher than a second preset voltage value, the battery switching circuit outputs the voltage of the first battery, and when the voltage of the first battery is lower than or equal to the second preset voltage value, the battery switching circuit outputs the voltage of the second battery;
the charging module is respectively connected with the output end of the power supply switching circuit and the output end of the battery switching circuit, when the voltage of the output end of the power supply switching circuit is higher than a third preset voltage value, the charging module outputs the voltage of the output end of the power supply switching circuit and controls the battery switching circuit to be switched off, and when the voltage of the output end of the power supply switching circuit is lower than or equal to the third preset voltage value, the charging module outputs the voltage of the output end of the battery switching circuit.
2. The power supply circuit of claim 1, further comprising a control circuit, wherein an input terminal of the control circuit is connected to the first battery and the second battery, an output terminal of the control circuit is connected to the charging module, the charging module is further connected to the first battery and the second battery, and the control circuit is configured to detect the power of the first battery and the second battery at an output terminal of the power switching circuit, and control the charging module to charge the first battery or the second battery according to the power of the first battery and the second battery.
3. The dual power dual battery power supply circuit of claim 2, further comprising an EEPROM module, said EEPROM module being connected to said control circuit.
4. The power supply circuit of dual power supply dual batteries according to claim 2, wherein the battery switching circuit comprises a first chip, a first MOS transistor, a second MOS transistor, a third MOS transistor and a fourth MOS transistor, the first MOS transistor, the second MOS transistor, the third MOS transistor and the fourth MOS transistor are all P-type MOS transistors, the source of the first MOS transistor is connected with the first battery, the drain of the first MOS transistor is connected with the drain of the second MOS transistor, the gates of the first MOS transistor are respectively connected with the gates of the second MOS transistor, the source of the third MOS transistor is connected with the second battery, the drain of the third MOS transistor is connected with the drain of the fourth MOS transistor, the gates of the third MOS transistor are respectively connected with the gates of the fourth MOS transistor, the source of the second MOS transistor is connected with the source of the fourth MOS transistor and is the output terminal of the battery switching circuit, the first chip is respectively connected with the drain electrode of the first MOS tube, the drain electrode of the second MOS tube, the drain electrode of the third MOS tube and the drain electrode of the fourth MOS tube.
5. The power supply circuit of the dual power supply dual battery as claimed in claim 2, wherein the power switching circuit includes a second chip, a fifth MOS transistor, a sixth MOS transistor, a seventh MOS transistor and an eighth MOS transistor, the fifth MOS transistor, the sixth MOS transistor, the seventh MOS transistor and the eighth MOS transistor are all P-type MOS transistors, a source of the fifth MOS transistor is connected to the first power supply, a drain of the fifth MOS transistor is connected to a drain of the sixth MOS transistor, gates of the fifth MOS transistor are respectively connected to a gate of the sixth MOS transistor, a source of the seventh MOS transistor is connected to the second power supply, a drain of the seventh MOS transistor is connected to a drain of the eighth MOS transistor, a gate of the seventh MOS transistor is respectively connected to a gate of the eighth MOS transistor, a source of the sixth MOS transistor is connected to a source of the eighth MOS transistor, and is an output terminal of the power switching circuit, the second chip is respectively connected with the drain electrode of the fifth MOS tube, the drain electrode of the sixth MOS tube, the drain electrode of the seventh MOS tube and the drain electrode of the eighth MOS tube.
6. The power supply circuit of the dual power supply dual batteries according to claim 5, wherein the charging module comprises a battery charging circuit and a charging switch circuit, an input end of the charging switch circuit is connected with an output end of the battery charging circuit, and an output end of the charging switch circuit is respectively connected with the first battery and the second battery.
7. The power supply circuit of dual power supply dual batteries according to claim 6, wherein the battery charging circuit comprises a third chip, a ninth MOS transistor, a tenth MOS transistor and an eleventh MOS transistor, the ninth MOS transistor, the tenth MOS transistor and the eleventh MOS transistor are all P-type MOS transistors, the third chip comprises a charging detection pin, a charging control pin, a first voltage control pin and a second voltage control pin, the charging detection pin is connected with the output end of the power switching circuit, the gate of the ninth MOS transistor is connected with the charging control pin, the drain of the ninth MOS transistor is respectively connected with the output end of the power switching circuit, which is the output end of the battery charging circuit, the output end of the battery charging circuit is the output end of the charging module, the gate of the tenth MOS transistor is connected with the first voltage control pin, the drain of the tenth MOS transistor is grounded, the source electrode of the tenth MOS tube is connected with the source electrode of the eleventh MOS tube, the grid electrode of the eleventh MOS tube is connected with the second voltage control pin, and the source electrode of the eleventh MOS tube is connected with the drain electrode of the ninth MOS tube.
8. The power supply circuit of the dual-power dual-battery, as recited in claim 6, wherein the charge switch circuit comprises a twelfth MOS transistor, a thirteenth MOS transistor, a fourteenth MOS transistor, a fifteenth MOS transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor, the twelfth MOS transistor, the thirteenth MOS transistor, the fourteenth MOS transistor, and the fifteenth MOS transistor are all P-type MOS transistors, a drain of the twelfth MOS transistor is connected to a first end of the first capacitor and a first end of the first resistor, respectively, and is an input terminal of the charge switch circuit, a gate of the twelfth MOS transistor is connected to a second end of the first capacitor, a second end of the first resistor, and a first end of the second resistor, respectively, a source electrode of the twelfth MOS transistor is connected to a source electrode of the thirteenth MOS transistor, a drain electrode of the thirteenth MOS transistor is connected to the first end of the second capacitor, the first end of the third resistor and the first battery, a gate electrode of the thirteenth MOS transistor is connected to the second end of the second capacitor, the second end of the third resistor and the first end of the fourth resistor, the second end of the second resistor is connected to the second end of the fourth resistor and the control circuit, a drain electrode of the fourteenth MOS transistor is connected to the first end of the third capacitor and the first end of the fifth resistor, and is an input end of the charging switch circuit, a gate electrode of the fourteenth MOS transistor is connected to the second end of the third capacitor, the second end of the fifth resistor and the first end of the sixth resistor, and a source electrode of the fourteenth MOS transistor is connected to a source electrode of the fifteenth MOS transistor, the drain of the fifteenth MOS transistor is connected to the first end of the fourth capacitor, the first end of the seventh resistor, and the second battery, the gate of the fifteenth MOS transistor is connected to the second end of the fourth capacitor, the second end of the seventh resistor, and the first end of the eighth resistor, and the second end of the sixth resistor is connected to the second end of the eighth resistor and the control circuit.
9. A tablet terminal, characterized in that the tablet terminal comprises a tablet main body and the dual power supply dual battery supply circuit of any one of claims 1 to 8, which is provided to the tablet main body.
10. The tablet terminal of claim 9, wherein the tablet body is provided with a docking station having a cradle structure and provided with a fitting hole for fixing to a vehicle frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210164507.5A CN114977361A (en) | 2022-02-22 | 2022-02-22 | Power supply circuit and panel terminal of dual supply double cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210164507.5A CN114977361A (en) | 2022-02-22 | 2022-02-22 | Power supply circuit and panel terminal of dual supply double cell |
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| CN114977361A true CN114977361A (en) | 2022-08-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210164507.5A Pending CN114977361A (en) | 2022-02-22 | 2022-02-22 | Power supply circuit and panel terminal of dual supply double cell |
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| CN113659645A (en) * | 2021-06-21 | 2021-11-16 | 东莞市吉瑞达实业有限公司 | High-voltage charging and discharging secondary protection circuit |
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| US20140217988A1 (en) * | 2013-02-06 | 2014-08-07 | Seiko Instruments Inc. | Charge/discharge control circuit and battery device |
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