CN110943520B - Charging path management circuit of equipment and equipment - Google Patents
Charging path management circuit of equipment and equipment Download PDFInfo
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- CN110943520B CN110943520B CN201811109359.7A CN201811109359A CN110943520B CN 110943520 B CN110943520 B CN 110943520B CN 201811109359 A CN201811109359 A CN 201811109359A CN 110943520 B CN110943520 B CN 110943520B
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Abstract
The application discloses a charging path management circuit of equipment and the equipment, wherein the circuit comprises a charging interface, a charging path unit and a management unit, and the charging path unit is used for connecting the charging interface with a rechargeable battery; the management unit is connected with the charging interface and used for detecting whether the charging interface is connected with the external power supply equipment or not, and is also connected with the control end of the charging path unit and used for switching off the charging path unit when the charging interface is connected with the external power supply equipment, detecting whether the MCU of the equipment in the preset time range establishes communication connection with the external power supply equipment or not, and switching on the charging path unit if the MCU does not establish communication connection in the preset time range. According to the charging method and the charging device, the charging path unit is turned off when the charging interface is connected to the external power supply equipment, and the charging path unit is turned on when the communication connection with the power supply equipment is not established within the preset duration range, so that the equipment is only charged when being connected to the AC adapter, and a mobile phone or a computer is protected from being damaged by too large charging current in the equipment.
Description
Technical Field
The present invention relates to, but not limited to, the field of electrical technologies, and in particular, to a charging path management circuit for a device and a device.
Background
Charging refers to the process of replenishing the battery or other device with electricity. When some equipment is charged, the maximum charging current can reach more than 3 amperes (A), and if the equipment is connected to a mobile phone or a computer for data transmission, the charging circuit can be communicated, and because the maximum output current of a USB interface of the mobile phone or the computer is about 500 milliamperes (mA), if the equipment is connected to the mobile phone or the computer for data upgrade and is simultaneously charged, the mobile phone or the computer can be damaged due to too large charging current.
Disclosure of Invention
The embodiment of the invention provides a charging path management circuit and equipment of equipment, which can prevent power supply equipment such as a mobile phone or a computer and the like from being damaged by too large charging current in the equipment.
In order to achieve the purpose of the invention, the technical scheme of the embodiment of the invention is realized as follows:
the embodiment of the invention provides a charging path management circuit of equipment, which comprises a charging interface, a charging path unit and a management unit, wherein:
the charging path unit is used for connecting the charging interface and a charging battery;
the management unit is connected to the charging interface and used for detecting whether the charging interface is connected to external power supply equipment or not; the management unit is further connected with a control end of the charging path unit and used for turning off the charging path unit when the charging interface is connected to external power supply equipment, detecting whether the MCU of the equipment establishes communication connection with the external power supply equipment within a preset time range, and conducting the charging path unit if the MCU does not establish communication connection within the preset time range.
In an embodiment, the charging path management circuit further comprises a supply path unit, wherein:
the power supply path unit is used for connecting the charging interface with the MCU of the equipment;
the management unit is further used for conducting the power supply path unit when the charging interface is connected to external power supply equipment; and when the communication connection is not established within the preset time range, the power supply path unit is turned off.
In one embodiment, the charging path unit includes a first transistor, a source of the first transistor is connected to the charging interface, a drain of the first transistor is connected to the rechargeable battery, and a gate of the first transistor is connected to the management unit;
the power supply path unit comprises a second transistor and a rectification and voltage stabilization module, the source electrode of the second transistor is connected with the charging interface, the drain electrode of the second transistor is connected with the input end of the rectification and voltage stabilization module, the grid electrode of the second transistor is connected with the management unit, and the output end of the rectification and voltage stabilization module is connected with the MCU of the equipment.
In one embodiment, the management unit includes a power detection module, an on-off control module, and an MCU of the device, wherein:
the power detection module comprises a power detection port, a third transistor, a first resistor and a second resistor, wherein: the first resistor is connected between the base electrode of the third transistor and the charging interface, the second resistor is connected between the collector electrode of the third transistor and the output end of the rectification voltage stabilizing module, one end of the power supply detection port is connected between the collector electrode of the third transistor and the second resistor, and the other end of the power supply detection port is connected with the input/output port of the MCU of the equipment;
the on-off control module comprises an on-off control port, a fourth transistor, a fifth transistor, a third resistor, a fourth resistor and a fifth resistor, wherein: the base electrode of the fourth transistor is connected with the on-off control port; the collector of the fourth transistor is connected with the grid of the first transistor, the base of the fifth transistor is connected through a third resistor, and the source of the second transistor is connected through a fourth resistor; an emitter of the fourth transistor and an emitter of the fifth transistor are respectively grounded; the collector of the fifth transistor is connected with the grid electrode of the second transistor and is connected with the source electrode of the second transistor through a fifth resistor;
and the MCU of the equipment controls the on-off control port to output a first control signal for switching on the power supply path unit and switching off the charging path unit or a second control signal for switching off the power supply path unit and switching on the charging path unit.
In an embodiment, the first transistor and the second transistor are both P-type Metal Oxide Semiconductor (MOS) transistors, and the third transistor and the fourth transistor are both NPN-type triodes;
the MCU of the equipment outputs a first control signal by default, wherein the first control signal is a low-level signal; and when the management unit does not detect that the equipment is in communication connection with the external power supply equipment within the preset duration range, the MCU of the equipment outputs a second control signal, wherein the second control signal is a high-level signal.
In one embodiment, the charging interface is a Universal Serial Bus (USB) power supply interface; the management unit detects whether the equipment establishes communication connection with external power supply equipment within a preset time range, and specifically includes:
and the MCU of the equipment detects whether the equipment establishes USB communication connection with the external power supply equipment within the preset time range through a USB data interface, and the USB power supply interface and the USB data interface are integrated in the same USB interface.
In an embodiment, the rechargeable battery comprises a rechargeable battery of the device and/or a rechargeable battery of an accessory device to which the device is connected.
In an embodiment, the device is a positioning base station; the accessory device is a handle and/or a helmet locator.
Embodiments of the present invention further provide an apparatus, including the charging path management circuit as described in any of the above.
The technical scheme of the embodiment of the invention has the following beneficial effects:
according to the charging path management circuit and the charging path management device of the equipment, the charging path unit is turned off when the charging interface is connected to the external power supply equipment, and the charging path unit is turned on when the communication connection with the external power supply equipment is not established within the preset time range, so that the equipment is charged only when being connected to the AC adapter, and is not charged when being connected to the USB interface of the power supply equipment such as a mobile phone or a computer, and the mobile phone or the computer can be protected from being damaged by too large charging current in the equipment.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a schematic structural diagram of a charging path management circuit of a device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a charging path management circuit of another apparatus according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a charging path management circuit of a device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
As shown in fig. 1, an embodiment of the present invention provides a charging path management circuit of a device, including a charging interface 101, a charging path unit 102, and a management unit 103, where:
the charging path unit 102 is configured to connect the charging interface 101 and a rechargeable battery;
the management unit 103 is connected to the charging interface 101 and is used for detecting whether the charging interface 101 is connected to an external power supply device; the management Unit 103 is further connected to a control end of the charging path Unit 102, and configured to turn off the charging path Unit 102 when the charging interface 101 is connected to an external power supply device, and detect whether a Micro Controller Unit (MCU) of the device establishes a communication connection with the external power supply device within a preset time duration range, and turn on the charging path Unit 102 if the communication connection is not established within the preset time duration range.
It should be noted that the preset duration range needs to be preset according to a specific communication protocol, for example, if the charging interface is a USB interface, and the MCU of the device establishes a USB communication connection with an external USB power supply device through the USB protocol, the preset duration range should be greater than or equal to a time length required for the MCU of the device to establish the USB communication connection with the external USB power supply device.
When the charging path management circuit of the device of the present application is used, the management unit 103 turns off the charging path unit 102 and prohibits charging of the device when the charging interface 101 is just connected to an external power supply device; when detecting that the MCU of the device is not in communication connection with an external power supply device within a preset duration range, the management unit 103 turns on the charging path unit 102 to allow the device to be charged, so that the device is only charged when connected to the AC adapter, and is not charged when connected to the USB interface of a power supply device such as a mobile phone or a computer, thereby protecting the mobile phone or the computer from being damaged by too large charging current in the device.
In an embodiment of the present invention, as shown in fig. 2, the charging path management circuit of the device further includes a power supply path unit 104, where:
the power supply path unit 104 is configured to connect the charging interface 101 with the MCU of the device;
the management unit 103 is further configured to turn on the power supply path unit 104 when the charging interface 101 is connected to an external power supply device; and when no communication connection is established within the preset time range, the power supply path unit 104 is turned off.
When the device connects the charging interface 101 to an external power supply device in a shutdown state, the MCU of the device is powered on through the power supply path unit 104, the MCU of the device is automatically started, and then the MCU of the device can detect whether the device establishes a communication connection with the external power supply device within a preset duration range.
In an embodiment of the present invention, the charging path unit 102 includes a first transistor, a source of the first transistor is connected to the charging interface 101, a drain of the first transistor is connected to the rechargeable battery, and a gate of the first transistor is connected to the management unit 103;
the power supply path unit 104 includes a second transistor and a rectifying and voltage-stabilizing module, a source of the second transistor is connected to the charging interface 101, a drain of the second transistor is connected to an input terminal of the rectifying and voltage-stabilizing module, a gate of the second transistor is connected to the management unit 103, and an output terminal of the rectifying and voltage-stabilizing module is connected to the MCU of the device.
In an example of this embodiment, the rectifying and voltage-stabilizing module includes a rectifying diode and a linear regulator, which are electrically connected. For example, the linear Regulator may be a Low Dropout Regulator (LDO).
In this embodiment, the management unit 103 includes a power detection module, an on-off control module, and an MCU of the device, wherein:
the power detection module comprises a power detection port, a third transistor, a first resistor and a second resistor, wherein: the first resistor is connected between the base of the third transistor and the charging interface 101, the second resistor is connected between the collector of the third transistor and the output end of the rectifying and voltage-stabilizing module, one end of the power detection port is connected between the collector of the third transistor and the second resistor, and the other end of the power detection port is connected with the input/output port of the MCU of the device (the MCU of the device can read the state of the power detection port through the input/output port to determine whether the charging interface is connected to an external charging device);
the on-off control module comprises an on-off control port, a fourth transistor, a fifth transistor, a third resistor, a fourth resistor and a fifth resistor, wherein: the base electrode of the fourth transistor is connected with the on-off control port; the collector of the fourth transistor is connected with the grid of the first transistor, the base of the fifth transistor is connected through a third resistor, and the source of the second transistor is connected through a fourth resistor; an emitter of the fourth transistor and an emitter of the fifth transistor are respectively grounded; the collector of the fifth transistor is connected with the grid electrode of the second transistor and is connected with the source electrode of the second transistor through a fifth resistor;
the MCU of the device controls the on-off control port to output a first control signal for turning on the power supply path unit 104 and turning off the charging path unit 102, or a second control signal for turning off the power supply path unit 104 and turning on the charging path unit 102.
When the MCU of the device establishes a communication connection with an external power supply device within a preset duration range, the MCU of the device controls the on-off control port to output a first control signal for turning on the power supply path unit 104 and turning off the charging path unit 102; when the MCU of the device does not establish a communication connection with an external power supply device within a preset duration range, the MCU of the device controls the on-off control port to output a second control signal for turning off the power supply path unit 104 and turning on the charging path unit 102.
In an example of this embodiment, the first transistor and the second transistor are both P-type MOS transistors, and the third transistor and the fourth transistor are both NPN-type triodes;
the MCU of the equipment outputs a first control signal by default, wherein the first control signal is a low-level signal; when the management unit 103 does not detect that the device is in communication connection with the external power supply device within the preset time length range, the MCU of the device outputs a second control signal, where the second control signal is a high level signal.
Note that the MOS Transistor is an abbreviation of Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET).
In an embodiment of the present invention, the charging interface 101 is a USB power supply interface; the management unit 103 detects whether the device establishes a communication connection with an external power supply device within a preset duration range, specifically:
and the MCU of the equipment detects whether the equipment establishes USB communication connection with the external power supply equipment within the preset time range through a USB data interface, and the USB power supply interface and the USB data interface are integrated in the same USB interface.
It should be noted that the USB interface is a common external bus standard, has successfully replaced serial and parallel ports, and becomes a necessary interface for computers and a large number of intelligent devices. The USB interface usually has 4 lines, two power lines (VBUS and GND) for power supply, and two signal lines (D + and D-) for USB data transmission.
As shown in fig. 3, a charging path management circuit of a device according to an embodiment of the present invention includes a power detection module, an on-off control module, a charging path unit, and a power supply path unit, where the power detection module, the on-off control module, and an MCU of the device constitute the management unit, where USB VCC is a charging interface, USB PGOOD is a power detection port whose state can be detected through an I/O port of the MCU of the device, USB VCC is an on-off control port whose state can be controlled through the MCU of the device, after a V BAT output port is connected to a linear regulator, power is supplied to the MCU of the device, 3.3V is an output voltage of the linear regulator, and a +5V USB port is an output port for charging a rechargeable battery of the device and/or an accessory device of the device.
The power detection module comprises a power detection port USB PGOOD, a first resistor R1, a second resistor R2 and a third triode Q3(NPN type triode), when a USB device or an AC power adapter is connected to a charging interface USB VCC of the device, the Q3 triode is conducted, and the MCU of the device can detect a low level at a USB _ PGOOD port; when the USB equipment or the AC power adapter is disconnected from the charging interface USB VCC of the equipment, the MCU can detect a high level at the USB _ PGOOD port so as to judge whether the power supply equipment is connected to the charging interface USB VCC of the equipment.
The charging path unit comprises a first transistor Q1 (P-type MOS tube); the power supply path unit comprises a second transistor Q2 (P-type MOS tube), a rectifier diode D1 and a linear voltage regulator (not shown in the figure); the on-off control module comprises: a fourth transistor Q4(NPN transistor), a fifth transistor Q5(NPN transistor), a third resistor R3, a fourth resistor R4, and a fifth resistor R5. The MCU of the equipment controls the USBVCC _ CTRL port to be in a low level by default, when the USB equipment or the AC power supply is connected to the charging interface USB VCC of the equipment for supplying power, the USBVCC enables the level of the node A to be in a high level through R4, the Q1PMOS tube is turned off, and the charging path of the lithium battery is controlled to be turned off. The Q5NPN type triode is conducted to enable the node B to be at a low level, the Q2PMOS tube is controlled to be conducted, the USB _ VCC is subjected to voltage reduction of 0.7V through the Q2 and the D1 to output V BAT (4.2V), the voltage is sent to the linear voltage stabilizing IC to be subjected to voltage stabilization output, and at the moment, the input current of the whole machine is about 100 MA.
And after detecting the USB _ PGOOD signal, the MCU of the equipment detects whether the USB port establishes communication connection with other USB equipment within a preset time range, so as to judge whether the power supply equipment accessed at this time is the USB equipment. When the USB port is in communication connection with other USB devices within the preset duration range, the accessed power supply device is judged to be the USB device, and the MCU controls the USBVCC _ CTRL to maintain a low level (not to be charged). When the USB port is not in communication connection with other USB devices within the preset duration range, the accessed power supply device is judged to be an AC power adapter, the MCU controls the USBVCC _ CTRL to maintain a high level (charging), the node A is a low level, the Q1PMOS tube is conducted, the node B is a high level, the Q2PMOS tube is turned off, the lithium battery charging circuit is started, and the input current of the whole machine is about 3A.
In an embodiment of the invention, the rechargeable battery comprises a rechargeable battery of the device and/or a rechargeable battery of an accessory device to which the device is connected.
In an example of this embodiment, the device is a positioning base station; the accessory device is a handle and/or a helmet locator.
An embodiment of the present invention further provides an apparatus, where the apparatus includes the charging path management circuit described in any of the above.
According to the charging path management circuit and the charging path management device of the equipment, the charging path unit is turned off when the charging interface is connected to the external power supply equipment, and the charging path unit is turned on when the communication connection with the external power supply equipment is not established within the preset time range, so that the equipment is charged only when being connected to the AC adapter, and is not charged when being connected to the USB interface of the power supply equipment such as a mobile phone or a computer, and the mobile phone or the computer can be protected from being damaged by too large charging current in the equipment.
It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing the relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the foregoing embodiments may also be implemented by using one or more integrated circuits, and accordingly, each module/unit in the foregoing embodiments may be implemented in the form of hardware, and may also be implemented in the form of a software functional module. The present invention is not limited to any specific form of combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a charging path management circuit of equipment, includes the interface that charges, its characterized in that still includes charging path unit and administrative unit, wherein:
the charging path unit is used for connecting the charging interface and a charging battery;
the management unit is connected to the charging interface and used for detecting whether the charging interface is connected to external power supply equipment or not; the management unit is further connected with a control end of the charging path unit and used for turning off the charging path unit when the charging interface is connected to external power supply equipment, detecting whether the MCU of the equipment establishes communication connection with the external power supply equipment within a preset time range, and conducting the charging path unit if the MCU does not establish communication connection within the preset time range.
2. The charging path management circuit of claim 1, further comprising a supply path unit, wherein:
the power supply path unit is used for connecting the charging interface with the MCU of the equipment;
the management unit is further used for conducting the power supply path unit when the charging interface is connected to external power supply equipment; and when the communication connection is not established within the preset time range, the power supply path unit is turned off.
3. The charge path management circuit of claim 2,
the charging path unit comprises a first transistor, the source electrode of the first transistor is connected with the charging interface, the drain electrode of the first transistor is connected with the rechargeable battery, and the grid electrode of the first transistor is connected with the management unit;
the power supply path unit comprises a second transistor and a rectification and voltage stabilization module, the source electrode of the second transistor is connected with the charging interface, the drain electrode of the second transistor is connected with the input end of the rectification and voltage stabilization module, the grid electrode of the second transistor is connected with the management unit, and the output end of the rectification and voltage stabilization module is connected with the MCU of the equipment.
4. The charging path management circuit according to claim 3, wherein the management unit comprises a power detection module, an on-off control module, and an MCU of the device, wherein:
the power detection module comprises a power detection port, a third transistor, a first resistor and a second resistor, wherein: the first resistor is connected between the base electrode of the third transistor and the charging interface, the second resistor is connected between the collector electrode of the third transistor and the output end of the rectification voltage stabilizing module, one end of the power supply detection port is connected between the collector electrode of the third transistor and the second resistor, and the other end of the power supply detection port is connected with the input/output port of the MCU of the equipment;
the on-off control module comprises an on-off control port, a fourth transistor, a fifth transistor, a third resistor, a fourth resistor and a fifth resistor, wherein: the base electrode of the fourth transistor is connected with the on-off control port; the collector of the fourth transistor is connected with the grid of the first transistor, the base of the fifth transistor is connected through a third resistor, and the source of the second transistor is connected through a fourth resistor; an emitter of the fourth transistor and an emitter of the fifth transistor are respectively grounded; the collector of the fifth transistor is connected with the grid electrode of the second transistor and is connected with the source electrode of the second transistor through a fifth resistor;
and the MCU of the equipment controls the on-off control port to output a first control signal for switching on the power supply path unit and switching off the charging path unit or a second control signal for switching off the power supply path unit and switching on the charging path unit.
5. The charge path management circuit of claim 4, wherein the first transistor and the second transistor are both P-type Metal Oxide Semiconductor (MOS) transistors, and the third transistor and the fourth transistor are both NPN-type triodes;
the MCU of the equipment outputs a first control signal by default, wherein the first control signal is a low-level signal; and when the management unit does not detect that the equipment is in communication connection with the external power supply equipment within the preset duration range, the MCU of the equipment outputs a second control signal, wherein the second control signal is a high-level signal.
6. The charging path management circuit of claim 4, wherein the charging interface is a Universal Serial Bus (USB) power interface; the management unit detects whether the equipment establishes communication connection with external power supply equipment within a preset time range, and specifically includes:
and the MCU of the equipment detects whether the equipment establishes USB communication connection with the external power supply equipment within the preset time range through a USB data interface, and the USB power supply interface and the USB data interface are integrated in the same USB interface.
7. The charge path management circuit of claim 1, wherein the rechargeable battery comprises a rechargeable battery of the device and/or a rechargeable battery of an accessory device to which the device is connected.
8. The charge path management circuit of claim 7, wherein the device is a positioning base station; the accessory device is a handle and/or a helmet locator.
9. An apparatus comprising a charge path management circuit, wherein the charge path management circuit is a circuit as claimed in any one of claims 1 to 8.
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| CN107562167A (en) * | 2017-08-29 | 2018-01-09 | 努比亚技术有限公司 | Multipath charging method, mobile terminal and computer-readable recording medium |
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