CN211266569U - Main and auxiliary battery switching circuit for intelligent module and terminal comprising same - Google Patents
Main and auxiliary battery switching circuit for intelligent module and terminal comprising same Download PDFInfo
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- CN211266569U CN211266569U CN201922488206.4U CN201922488206U CN211266569U CN 211266569 U CN211266569 U CN 211266569U CN 201922488206 U CN201922488206 U CN 201922488206U CN 211266569 U CN211266569 U CN 211266569U
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Abstract
The utility model discloses a main and auxiliary battery switching circuit for an intelligent module and a terminal comprising the same, wherein the circuit comprises a main battery, an auxiliary battery, a battery detection unit and a switching unit, and the main battery can be detached and is internally provided with a thermistor; the battery detection unit is connected with the auxiliary battery power supply end, and the switching unit is connected with the output end of the battery detection unit and the auxiliary battery power supply end; when the main battery is not detached, the main battery supplies power to the main battery through a battery pin of the intelligent module, the thermistor end is connected with the input end of the battery detection unit, the battery detection unit outputs an invalid level to the switching unit, and the switching unit disconnects the power supply end of the auxiliary battery and the battery pin; when the main battery is detached, the thermistor end is disconnected with the input end, the battery detection unit outputs an effective level, and the auxiliary battery is connected with the battery pin and supplies power for the intelligent module. The utility model discloses do not additionally increase the device, realize main and auxiliary battery automatic switch-over through MOS pipe and diode circuit, the circuit is simple, realizes reliably stably and with low costs.
Description
Technical Field
The utility model relates to a supply circuit field, in particular to a terminal that is used for intelligent object's major-minor battery switching circuit and includes it.
Background
The power consumption of the existing intelligent module is relatively high, the handheld terminal device is powered by a battery, the endurance time of the battery is limited by factors such as the structure size, and the like, and the endurance requirement of the handheld device or emergency backup can be realized by switching a main battery to a circuit of an auxiliary battery so as to prevent important data from being lost.
Some handheld devices cannot supply power to the main battery and the auxiliary battery at the same time, and a special switching circuit is needed to switch between the main battery and the auxiliary battery. The existing scheme of switching the main battery and the auxiliary battery is generally composed of an MCU
The voltage detection circuit comprises a Microcontroller Unit and an ADC (analog-to-digital converter). The voltage of the main battery is collected through the ADC, the MCU is informed when the voltage of the main battery is not enough to meet the power supply requirement of the system, and the main battery is switched to the auxiliary battery through the change of the output level of the MCU. However, the scheme adds integrated circuits such as the MCU and the ADC, the cost is increased, the area of a PCB (printed circuit board) of the handheld device is limited, and the problem that the space of a decorative part on the PCB is compressed exists.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is in order to overcome MCU + ADC's major-minor battery switching scheme increase cost among the prior art to because handheld device's the limited and goods of furniture for display rather than for use space compressed defect that leads to of PCB area provides a major-minor battery switching circuit and includes its terminal for intelligent object.
The utility model discloses an above-mentioned technical problem is solved through following technical scheme:
the utility model provides a main and auxiliary battery switching circuit for intelligent module, the main and auxiliary battery switching circuit includes main battery and auxiliary battery, the main battery can be dismantled, the main battery includes a built-in thermistor, thermistor's one end ground connection, the other end is drawn forth as the thermistor end;
the main and auxiliary battery switching circuit comprises a battery detection unit and a switching unit;
the battery detection unit is electrically connected with the power supply end of the auxiliary battery, and the switching unit is electrically connected with the output end of the battery detection unit and the power supply end of the auxiliary battery;
when the main battery is not detached, the main battery supplies power to the intelligent module through a battery pin of the intelligent module, the thermistor end is electrically connected with the input end of the battery detection unit, the output end of the battery detection unit outputs an invalid level to the switching unit, and the switching unit disconnects the power supply end of the auxiliary battery from the battery pin;
when the main battery is detached, the thermistor end is disconnected with the input end of the battery detection unit, the output end of the battery detection unit outputs an effective level to the switching unit, the switching unit connects the power supply end of the auxiliary battery with the battery pin, and the auxiliary battery supplies power to the intelligent module through the battery pin.
Preferably, the battery detection unit comprises an NMOS transistor, a first resistor and a second resistor;
one end of the first resistor is electrically connected with the power supply end of the secondary battery, the other end of the first resistor is electrically connected with one end of the second resistor, the other end of the second resistor is electrically connected with the grid electrode of the NMOS tube, and the grid electrode of the NMOS tube is used as the input end of the battery detection unit; the source electrode of the NMOS tube is grounded, and the drain electrode of the NMOS tube is used as the output end of the battery detection unit;
when the main battery is not detached, the thermistor end is electrically connected with the input end of the battery detection unit, the first resistor, the second resistor and the thermistor form a voltage division circuit, and the grid-source voltage threshold of the NMOS tube is larger than the divided voltage value of the thermistor in the voltage division circuit.
Preferably, the switching unit comprises a PMOS transistor, a first diode and a third resistor;
the battery pin of the intelligent module is electrically connected with the drain electrode of the PMOS tube and the anode of the first diode, the source electrode of the PMOS tube and the cathode of the first diode are electrically connected with the power supply end of the auxiliary battery and one end of the third resistor, and the other end of the third resistor is electrically connected with the grid electrode of the PMOS tube and the output end of the battery detection unit.
Preferably, the temperature coefficient of the thermistor is less than zero.
The utility model also provides a terminal, the terminal includes aforementioned main and auxiliary battery switching circuit and the intelligent object who is used for intelligent object.
Preferably, the terminal further comprises a charging interface, the intelligent module further comprises a built-in charging unit, and the charging interface is electrically connected with the charging unit through a charging pin of the intelligent module; the charging unit is used for transmitting the electric energy input by the charging interface to the battery pin, and the battery pin charges the main battery and/or the auxiliary battery.
Preferably, the terminal further comprises a second thermistor, the temperature pin of the intelligent module is connected with one end of the second thermistor, and the other end of the second thermistor is grounded.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The utility model discloses an actively advance the effect and lie in: the utility model discloses a whether detect main battery built-in thermistor NTC and exist, whether the feed end of control auxiliary battery inserts power supply circuit, does not need additionally to increase the device, through simple MOS pipe (field effect transistor) and diode circuit realization main and auxiliary battery's automatic switch-over, the circuit is simple, and the circuit is realized reliably stably and with low costs.
Drawings
Fig. 1 is a schematic circuit diagram of a main-auxiliary battery switching circuit for an intelligent module according to embodiment 1 of the present invention.
Fig. 2 is a schematic circuit diagram of a main-auxiliary battery switching circuit for an intelligent module according to embodiment 2 of the present invention.
Fig. 3 is a schematic circuit diagram of a terminal including a main-auxiliary battery switching circuit for an intelligent module according to embodiment 3 of the present invention.
Detailed Description
The present invention is further illustrated by way of the following examples, which are not intended to limit the scope of the invention.
Example 1
The present embodiment provides a main-sub battery switching circuit for an intelligent module, which includes a main battery 1, a sub battery 2, a battery detection unit 3, and a switching unit 4, as shown in fig. 1. The main battery 1 is detachable, the main battery 1 comprises a built-in thermistor NTC, one end of the thermistor NTC is grounded, and the other end of the thermistor NTC is led out to serve as a thermistor end. The power supply end of the main battery 1 or the power supply end of the auxiliary battery 2 can be respectively and electrically connected with the battery pin of the intelligent module 3 according to different conditions to form two different power supply loops; the battery detection unit 3 and the switching unit 4 provide the intelligent module 3 with the automatic switching function of the main battery and the auxiliary battery.
The battery detection unit 3 is electrically connected with the power supply end of the auxiliary battery 2 and is connected with a pin where the thermistor end of the main battery 1 is located; the switching unit 4 is electrically connected to the output terminal of the battery detection unit 3 and to the power supply terminal of the sub-battery 2.
When the main battery 1 is not detached, the main battery 1 supplies power to the intelligent module 5 through a battery pin, a thermistor end is electrically connected with an input end of the battery detection unit 3, and the battery detection unit 3 outputs an invalid level to the switching unit 4 to indicate the existence of a thermistor NTC; the switching unit 4 disconnects the power supply end of the secondary battery 2 from the battery pin of the intelligent module 5, the secondary battery 2 is not connected to the power supply loop, and the intelligent module 5 is powered by the main battery at the moment. The inactive level may be set to a high level or a low level depending on the circuit.
When the main battery 1 is detached, the thermistor NTC on the main battery 1 is also detached synchronously, so that the thermistor end is disconnected from the input end of the battery detection unit 3, and the battery detection unit 3 outputs an active level to the switching unit 4, which indicates that the thermistor NTC does not exist; the switching unit 4 connects the power supply end of the secondary battery 2 with the battery pin of the intelligent module 5, the secondary battery 2 is connected to the power supply loop, and the secondary battery 2 supplies power to the intelligent module 5 through the battery pin of the intelligent module 5. The active level here is an electrical signal opposite to the inactive level.
The embodiment controls whether the power supply end of the secondary battery is connected to the power supply loop by detecting whether the NTC (negative temperature coefficient) built in the main battery exists or not without additionally adding an integrated circuit, realizes the automatic switching of the main battery and the secondary battery through the battery detection unit and the switching unit, and has the advantages of simple circuit, reliable and stable circuit realization and low cost.
Example 2
This embodiment is further detailed on the basis of embodiment 1, and as shown in fig. 2, the battery detection unit 3 includes an NMOS transistor Q1, a first resistor R1 and a second resistor R2, and the switching unit 4 includes a PMOS transistor Q2, a first diode D1 and a third resistor R3.
One end of the first resistor R1 is electrically connected with the power supply end of the secondary battery 2, the other end of the first resistor R1 is electrically connected with one end of the second resistor R2, the other end of the second resistor R2 is electrically connected with the grid electrode of the NMOS transistor Q1, and the grid electrode of the NMOS transistor Q1 is used as the input end of the battery detection unit 3; the source of the NMOS transistor Q1 is grounded, and the drain of the NMOS transistor Q1 serves as the output terminal of the battery detection unit 3.
The battery pin of the intelligent module 5 is electrically connected with the drain of the PMOS transistor Q2 and the positive electrode of the first diode D1, the source of the PMOS transistor Q2 and the negative electrode of the first diode D1 are electrically connected with the power supply end of the secondary battery 2 and one end of the third resistor R3, and the other end of the third resistor R3 is electrically connected with the gate of the PMOS transistor Q2 and the output end of the battery detection unit 3.
When the main battery 1 is not detached, the thermistor NTC is electrically connected to the input terminal of the battery detection unit 3, and the first resistor R1, the second resistor R2, and the thermistor NTC constitute a voltage division circuit. When the NMOS transistor Q1 is selected, the gate-source voltage threshold is selected to be greater than the divided voltage value of the thermistor NTC in the voltage dividing circuit, so that when the main battery 1 is powered, the NMOS transistor Q1 is turned off because the gate-source voltage threshold is not reached, the drain thereof is kept at a high level, i.e., the battery detection unit 3 outputs an invalid signal at a high level.
At this time, the gate of the PMOS transistor Q2 is connected to the output end of the battery detection unit 3, and is synchronously at a high level, the source voltage of the PMOS transistor Q2 is the power supply end level of the secondary battery 2, and is also at a high level, and the PMOS transistor Q2 is turned off; meanwhile, the first diode D1 is reversely connected with the secondary battery 2, the power supply end of the secondary battery 2 is disconnected with the battery pin of the intelligent module 5, the secondary battery 2 is not connected with a power supply loop, and the intelligent module 5 is powered by the main battery 1 at the moment.
When the main battery 1 is detached, the NTC thermistor thereon is also detached, the end of the second resistor R2 connected to the thermistor end is suspended, the gate of the NMOS transistor Q1 is at a high level of the power supply end of the sub-battery 2, the NMOS transistor Q1 is turned on, and the drain is pulled down to a low level by the source, that is, the battery detection unit 3 outputs a low-level effective signal.
At this time, the gate of the PMOS transistor Q2 is connected to the output end of the battery detection unit 3, and is synchronously at a low level, and meanwhile, the source voltage of the PMOS transistor Q2 is the power supply end level of the secondary battery 2, and is also at a high level, the gate source voltage of the PMOS transistor Q2 reaches its threshold, the PMOS transistor Q2 is turned on, the power supply end of the secondary battery 2 is electrically connected to the battery pin of the intelligent module 5, the secondary battery 2 is connected to the power supply loop, and the battery pin of the intelligent module 5 supplies power to the intelligent module 5.
When the type selection thermistor NTC is used, the temperature coefficient is selected to be smaller than zero, when the main battery 1 supplies power, the resistance value of the thermistor NTC is reduced along with the temperature rise of the main battery 1, the voltage dividing value of the thermistor NTC in a voltage dividing circuit is also reduced, and the risk that the NMOS tube Q1 is conducted along with the increase of the power supply time of the main battery is eliminated.
The embodiment controls whether the power supply end of the secondary battery is connected to the power supply loop by detecting whether the NTC (negative temperature coefficient) built in the main battery exists or not without additionally adding a device, realizes the automatic switching of the main battery and the secondary battery through a simple MOS (metal oxide semiconductor) tube and a diode circuit, and has the advantages of simple circuit, reliable and stable circuit realization and low cost.
Example 3
The present embodiment provides a terminal, as shown in fig. 3, including the main-sub battery switching circuit and the intelligent module 5 as in embodiment 1 or 2, the terminal further including a charging interface 6 and a second thermistor R4, and the intelligent module 5 further including a built-in charging unit 51.
The charging interface 6 is connected to an external charger, and is electrically connected to the built-in charging unit 51 through a charging pin of the smart module 5. The charging unit 51 is used for transmitting the electric energy from the charger, which is input from the charging interface 6, to the battery pin, and charging the main battery 1 and/or the sub-battery 2 through the battery pin.
The temperature pin of the intelligent module 5 is connected with one end of the second thermistor R4, and the other end of the second thermistor R4 is grounded. The resistance value of the second thermistor R4 indicates the temperature of the intelligent module 5, and when the temperature exceeds the preset temperature, the intelligent module 5 turns off the charging unit 51 to stop the charging function, thereby ensuring the normal operation of the intelligent module 5.
The terminal of the embodiment does not need to additionally increase devices, realizes automatic switching of the main battery and the auxiliary battery for power supply through a simple MOS (metal oxide semiconductor) tube and a diode circuit, uses the charging interface to connect an external charger for charging the main battery and the auxiliary battery, and uses the thermistor to detect the temperature of the intelligent module, thereby preventing the over-temperature of the module. The circuit is simple, reliable and stable in circuit realization and low in cost.
Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (7)
1. A main and auxiliary battery switching circuit for an intelligent module is characterized by comprising a main battery and an auxiliary battery, wherein the main battery is detachable and comprises a built-in thermistor, one end of the thermistor is grounded, and the other end of the thermistor is led out to serve as a thermistor end;
the main and auxiliary battery switching circuit comprises a battery detection unit and a switching unit;
the battery detection unit is electrically connected with the power supply end of the auxiliary battery, and the switching unit is electrically connected with the output end of the battery detection unit and the power supply end of the auxiliary battery;
when the main battery is not detached, the main battery supplies power to the intelligent module through a battery pin of the intelligent module, the thermistor end is electrically connected with the input end of the battery detection unit, the output end of the battery detection unit outputs an invalid level to the switching unit, and the switching unit disconnects the power supply end of the auxiliary battery from the battery pin;
when the main battery is detached, the thermistor end is disconnected with the input end of the battery detection unit, the output end of the battery detection unit outputs an effective level to the switching unit, the switching unit connects the power supply end of the auxiliary battery with the battery pin, and the auxiliary battery supplies power to the intelligent module through the battery pin.
2. The main-auxiliary battery switching circuit for a smart module as recited in claim 1, wherein the battery detection unit comprises an NMOS transistor, a first resistor and a second resistor;
one end of the first resistor is electrically connected with the power supply end of the secondary battery, the other end of the first resistor is electrically connected with one end of the second resistor, the other end of the second resistor is electrically connected with the grid electrode of the NMOS tube, and the grid electrode of the NMOS tube is used as the input end of the battery detection unit; the source electrode of the NMOS tube is grounded, and the drain electrode of the NMOS tube is used as the output end of the battery detection unit;
when the main battery is not detached, the thermistor end is electrically connected with the input end of the battery detection unit, the first resistor, the second resistor and the thermistor form a voltage division circuit, and the grid-source voltage threshold of the NMOS tube is larger than the divided voltage value of the thermistor in the voltage division circuit.
3. The main-auxiliary battery switching circuit for a smart module as recited in claim 1, wherein said switching unit comprises a PMOS transistor, a first diode and a third resistor;
the battery pin of the intelligent module is electrically connected with the drain electrode of the PMOS tube and the anode of the first diode, the source electrode of the PMOS tube and the cathode of the first diode are electrically connected with the power supply end of the auxiliary battery and one end of the third resistor, and the other end of the third resistor is electrically connected with the grid electrode of the PMOS tube and the output end of the battery detection unit.
4. The primary-secondary battery switching circuit for a smart module of claim 1 wherein said thermistor has a temperature coefficient less than zero.
5. A terminal, characterized in that it comprises a primary and secondary battery switching circuit for an intelligent module according to any one of claims 1 to 4 and an intelligent module.
6. The terminal of claim 5, wherein the terminal further comprises a charging interface, the smart module further comprises a built-in charging unit, and the charging interface is electrically connected with the charging unit through a charging pin of the smart module; the charging unit is used for transmitting the electric energy input by the charging interface to the battery pin, and the battery pin charges the main battery and/or the auxiliary battery.
7. The terminal of claim 6, further comprising a second thermistor, wherein the temperature pin of the smart module is connected to one end of the second thermistor, and the other end of the second thermistor is grounded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922488206.4U CN211266569U (en) | 2019-12-30 | 2019-12-30 | Main and auxiliary battery switching circuit for intelligent module and terminal comprising same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922488206.4U CN211266569U (en) | 2019-12-30 | 2019-12-30 | Main and auxiliary battery switching circuit for intelligent module and terminal comprising same |
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| CN211266569U true CN211266569U (en) | 2020-08-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021022957A1 (en) * | 2019-08-05 | 2021-02-11 | 百富计算机技术（深圳）有限公司 | Power source switching circuit and electronic apparatus |
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- 2019-12-30 CN CN201922488206.4U patent/CN211266569U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021022957A1 (en) * | 2019-08-05 | 2021-02-11 | 百富计算机技术（深圳）有限公司 | Power source switching circuit and electronic apparatus |
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