CN112737034A - Low-power consumption lithium battery charging management driving circuit - Google Patents
Low-power consumption lithium battery charging management driving circuit Download PDFInfo
- Publication number
- CN112737034A CN112737034A CN202011602847.9A CN202011602847A CN112737034A CN 112737034 A CN112737034 A CN 112737034A CN 202011602847 A CN202011602847 A CN 202011602847A CN 112737034 A CN112737034 A CN 112737034A
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- Prior art keywords
- lithium battery
- interface
- microprocessor
- usb type
- charging
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Classifications
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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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
-
- 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
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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
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The invention discloses a low-power-consumption lithium battery charging management driving circuit, which comprises a lithium battery, a microprocessor, a USB Type-C interface and a charging loop, wherein the lithium battery and the microprocessor are both connected with the charging loop, the microprocessor is used for controlling the on-off of the charging loop, the USB Type-C interface comprises four grounding pins, an MOS (metal oxide semiconductor) tube Q1 and a power supply for supplying power to the microprocessor, the USB Type-C interface is connected with the charging loop, the USB Type-C interface is a power output interface of the lithium battery and is used for detecting whether equipment is connected or not, at least one pin of the four grounding pins is redefined into a high-level detection signal pin, the detection signal pin is connected with a grid electrode of an MOS tube Q1, a source electrode of the MOS tube Q1 is connected with the power supply, and a drain electrode of the MOS tube Q1 is connected; the invention has the advantages of energy saving, environmental protection, simple circuit and few devices, and effectively controls the hardware cost of the whole machine.
Description
Technical Field
The invention relates to the technical field of lithium battery charging and discharging, in particular to a low-power-consumption lithium battery charging management driving circuit.
Background
At present, the projection market is increasingly white and hot, and various types of projectors on the market are full of Lin and Lang. In a micro-projection market, a lithium battery is arranged in one Type of micro projector, power can be supplied in a micro-projection mode outdoors or under the condition of power failure, and meanwhile the micro projector can be used as an emergency power supply to charge other mobile equipment through a USB Type-C interface.
At present, most of lithium batteries need a special chip or a single chip microcomputer to carry out real-time detection and charging management on external equipment, and after the external equipment is detected, a Microprocessor (MCU) controls a charging circuit to start working to charge the external equipment. Because the energy of the lithium battery is limited, if a Microprocessor (MCU) is always in a detection working state, the electric energy of the lithium battery can be slowly consumed, the lithium battery works for a long time, the consumed electric energy is more, the normal use of the lithium battery is seriously influenced, and meanwhile, the energy-saving environment-friendly concept pushed by the current society is contrary to.
Therefore, a charging driving management circuit is needed, and when no external equipment is inserted, the charging driving management circuit does not work; after an external mobile device is inserted into the charging interface, the Microprocessor (MCU) automatically works, and the charging circuit starts to work.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a low-power-consumption lithium battery charging management driving circuit, which detects whether external equipment is connected or not through a USB Type-C interface and is used as a judgment basis for turning on a Microprocessor (MCU) power supply, and then the charging circuit starts to work under the management control of a special chip or the MCU.
In order to achieve the purpose, the invention adopts the technical scheme that: a low-power consumption lithium battery charging management driving circuit comprises a lithium battery, a microprocessor, a USB Type-C interface and a charging loop, the lithium battery and the microprocessor are both connected with the charging loop, the microprocessor is used for controlling the on-off of the charging loop, the USB Type-C interface comprises four grounding pins, an MOS tube Q1 and a power supply for supplying power to the microprocessor, the USB Type-C interface is connected with the charging loop, the USB Type-C interface is a power output interface of the lithium battery, and is used for detecting whether a device is accessed, redefining at least one pin of the four grounding pins as a high-level detection signal pin, the detection signal pin is connected with the grid electrode of the MOS tube Q1, the source electrode of the MOS tube Q1 is connected with the power supply, and the drain electrode of the MOS tube Q1 is connected with the microprocessor.
As a further improvement of the present invention, the charging circuit includes a transistor Q2, a base of the transistor Q2 is connected to the microprocessor, a collector of the transistor Q2 is connected to the lithium battery, and an emitter of the transistor Q2 is connected to the USB Type-C interface.
As a further improvement of the present invention, the lithium battery charging system further comprises a current control chip arranged between the charging loop and the lithium battery, wherein the current control chip is further connected with the microprocessor, and the current control chip is used for detecting and regulating the current in the charging loop and sending the detection data to the microprocessor.
As a further improvement of the invention, a diode D1 is further arranged between the charging loop and the USB Type-C interface, an anode of the diode D1 is connected with the charging loop, and a cathode of the diode D1 is connected with the USB Type-C interface.
As a further improvement of the present invention, a grounded light emitting diode D2 is further disposed between the charging loop and the USB Type-C interface.
The invention is further illustrated below:
according to the invention, whether external equipment is accessed is detected through the USB Type-C interface to serve as a judgment basis for turning on a power supply of a Microprocessor (MCU), and then the charging circuit starts to work under the management control of a special chip or the MCU.
The invention utilizes the definition of the USB Type-C interface, and according to the USB Type-C standard protocol, pins A1, A12, B1 and B12 of the USB Type-C interface are defined as ground, and pins A4, A9, B4 and B9 are defined as power supply pins. In the invention, one pin (such as A1, or other three pins) of the ground pins A1, A12, B1 and B12 of the Type-C female connector of the projector is redefined and is redistributed into a detection signal pin (DET) to control the MCU power switch, and the rest 3 pins are ground pins (GND). When an external device is accessed, according to the USB Type-C protocol, the A1 can be connected with a corresponding ground pin of a peripheral device through a USB wire, so that the A1 and the Type-C female connectors A12, B1 and B12 are connected together again and grounded. A4, A9, B4, B9 VBUS as charging power pins.
The invention adopts the USB Type-C interface to detect the peripheral access state, and realizes the control and management of the lithium battery charging drive. The invention comprises a lithium battery, a current control chip, a Microprocessor (MCU), a USB Type-C interface and a charging loop. The lithium battery is a power supply for the projector; the current control chip is used for detecting and regulating the current in the loop and informing the microprocessor of the detection data; the microprocessor is used for controlling the on-off of the charging loop and controlling the working state or working time of the power supply control chip; the USB Type-C interface is used as a power output interface and is also a device access detection device.
When an external device is accessed, the driving circuit starts to work, and when no external device is accessed, the driving management circuit does not work. The MCU is not needed to monitor whether the equipment is inserted or not in real time.
The invention has the beneficial effects that:
according to the invention, whether external equipment is accessed is detected through the USB Type-C interface to serve as a judgment basis for turning on the special chip or the MCU power supply, and then the charging circuit starts to work under the management control of the special chip or the MCU. The system is more energy-saving and environment-friendly in work, simple in circuit and few in devices, and the hardware cost of the whole machine is effectively controlled.
Drawings
FIG. 1 is a schematic diagram illustrating a pin definition of a female header of a USB Type-C interface according to an embodiment of the present invention;
fig. 2 is a circuit block diagram of a charging management driving circuit according to an embodiment of the invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Examples
As shown in fig. 1 and fig. 2, a low power consumption lithium battery charging management driving circuit includes a lithium battery, a microprocessor, a USB Type-C interface and a charging loop, where the lithium battery and the microprocessor are both connected to the charging loop, the microprocessor is configured to control on/off of the charging loop, the USB Type-C interface includes four ground pins, a MOS transistor Q1 and a power supply configured to supply power to the microprocessor, the USB Type-C interface is connected to the charging loop, the USB Type-C interface is a power output interface of the lithium battery and is configured to detect whether a device is connected, redefine at least one of the four ground pins as a high-level detection signal pin, the detection signal pin is connected to a gate of the MOS transistor Q1, and a source of the MOS transistor Q1 is connected to the power supply, the drain electrode of the MOS tube Q1 is connected with the microprocessor.
In this embodiment, the charging loop includes a transistor Q2, a base of the transistor Q2 is connected to the microprocessor, a collector of the transistor Q2 is connected to the lithium battery, and an emitter of the transistor Q2 is connected to the USB Type-C interface.
In this embodiment, the lithium battery charging system further includes a current control chip disposed between the charging circuit and the lithium battery, and the current control chip is further connected to the microprocessor, and is configured to detect and regulate a current in the charging circuit, and send detection data to the microprocessor.
In this embodiment, a diode D1 is further disposed between the charging loop and the USB Type-C interface, an anode of the diode D1 is connected to the charging loop, and a cathode of the diode D1 is connected to the USB Type-C interface.
In this embodiment, a grounded light emitting diode D2 is further disposed between the charging loop and the USB Type-C interface.
The present embodiment is further illustrated below:
as shown in FIG. 1, the present embodiment utilizes the definition of the USB Type-C interface, and according to the USB Type-C standard protocol, the pins A1, A12, B1 and B12 of the Type-C interface are defined as the ground, and the pins A4, A9, B4 and B9 are defined as the power supply pins. In this embodiment, one of the pins (e.g., a1, or other three pins) of the Type-C mother heads a1, a12, B1, and B12 of the projectors is redefined and redistributed to be the detection signal pin (DET), so as to control the MCU power Vcc switch K1, and the remaining 3 pins are still the ground pins (GND). When an external device is accessed, according to the USB Type-C standard protocol, the A1 can be connected with the corresponding ground pin of the peripheral device through a USB wire, so that the A1 and the Type-C female connectors A12, B1 and B12 are connected together again and grounded. A4, A9, B4, B9 VBUS as charging power pins.
This embodiment adopts USB Type-C interface to detect peripheral hardware access state, realizes the lithium cell drive control management that charges, and it is out of work to reach work when having equipment to insert, outage when no equipment inserts. As shown in fig. 2, the present embodiment includes a lithium battery, a current control chip, a Microprocessor (MCU), a USB Type-C interface, and a charging circuit. The lithium battery is a power supply for the projector; the current control chip is used for detecting and regulating the current in the loop and informing the microprocessor of the detection data; the Microprocessor (MCU) is used for controlling the on-off of the charging loop and controlling the working state or working time of the power supply control chip; the USB Type-C interface is used as a power output interface and is also a detection device.
The control unit is a Microprocessor (MCU). Before Type-C inserts, the A1 foot pull-up of female head of Type-C is the high level, and MOS pipe Q1 cuts off, inserts through the Type-C data line when external equipment, and the A1 foot of the female head of Type-C and A12, B1, B12 short circuit ground connection jump to the low level, and MOS pipe Q1 switches on, and power Vcc begins to supply power for Microprocessor (MCU), and microprocessor gets into operating condition.
The Microprocessor (MCU) begins to control the charging driving management circuit, at which time transistor Q2 is turned on and the charging circuit enters a charging state. In addition, the Microprocessor (MCU) can also perform charging timing to limit the charging time.
The current control chip is a charging current detection modulation unit. The charging current can be modulated according to the MCU signal, and meanwhile, the current can be detected, so that the equipment is prevented from being damaged by overlarge current caused by faults such as short circuit and the like.
The led D2 is used for indicating charging, when the charging circuit is turned on, the led D2 is turned on, and when the charging circuit is turned off, the led D2 is turned off.
Diode D1 prevents the external device power supply from damaging the charging circuit.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (5)
1. A low-power consumption lithium battery charging management driving circuit comprises a lithium battery, a microprocessor, a USB Type-C interface and a charging loop, wherein the lithium battery and the microprocessor are connected with the charging loop, the microprocessor is used for controlling the on-off of the charging loop, the USB Type-C interface comprises four grounding pins and is characterized by further comprising an MOS tube Q1 and a power supply used for supplying power to the microprocessor, the USB Type-C interface is connected with the charging loop, the USB Type-C interface is a power output interface of the lithium battery and is used for detecting whether equipment is connected or not, at least one pin of the four grounding pins is redefined to be a high-level detection signal pin, the detection signal pin is connected with a grid electrode of an MOS tube Q1, and a source electrode of the MOS tube Q1 is connected with the power supply, the drain electrode of the MOS tube Q1 is connected with the microprocessor.
2. The low power consumption lithium battery charging management driving circuit according to claim 1, wherein the charging loop comprises a transistor Q2, a base of the transistor Q2 is connected to the microprocessor, a collector of the transistor Q2 is connected to the lithium battery, and an emitter of the transistor Q2 is connected to the USB Type-C interface.
3. The lithium battery charging management driving circuit with low power consumption of claim 1 or 2, further comprising a current control chip disposed between the charging loop and the lithium battery, wherein the current control chip is further connected to the microprocessor, and the current control chip is configured to detect and regulate the magnitude of current in the charging loop and send the detected data to the microprocessor.
4. The low power consumption lithium battery charging management driving circuit according to claim 1, wherein a diode D1 is further disposed between the charging loop and the USB Type-C interface, an anode of the diode D1 is connected to the charging loop, and a cathode of the diode D1 is connected to the USB Type-C interface.
5. The low power consumption lithium battery charging management driving circuit according to claim 1, wherein a grounded light emitting diode D2 is further disposed between the charging loop and the USB Type-C interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011602847.9A CN112737034A (en) | 2020-12-29 | 2020-12-29 | Low-power consumption lithium battery charging management driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011602847.9A CN112737034A (en) | 2020-12-29 | 2020-12-29 | Low-power consumption lithium battery charging management driving circuit |
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| CN112737034A true CN112737034A (en) | 2021-04-30 |
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| CN202011602847.9A Pending CN112737034A (en) | 2020-12-29 | 2020-12-29 | Low-power consumption lithium battery charging management driving circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113316057A (en) * | 2021-05-28 | 2021-08-27 | 维沃移动通信有限公司 | Earphone, method and device for reducing power consumption and electronic equipment |
| CN114005232A (en) * | 2021-12-29 | 2022-02-01 | 广州市科锐达光电技术股份有限公司 | No-leakage TYPE-C burglar alarm |
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| CN114005232A (en) * | 2021-12-29 | 2022-02-01 | 广州市科锐达光电技术股份有限公司 | No-leakage TYPE-C burglar alarm |
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Application publication date: 20210430 |
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