A portable mobile terminal power supply device

Abstract

The application discloses a portable mobile terminal power supply device, comprising: a power supply input, including multiple energy input types; an input barrier circuit, the input end is connected with the power supply input, and the power supply input of the multiple energies is combined into one way and converted into a stabilized DC output; a DC / DC conversion circuit, connected with the output end of the input barrier circuit, and converting the stabilized DC output by the input barrier circuit into multiple DC outputs to a board card. The application provides a portable mobile terminal power supply device, which provides a power supply for a portable mobile device, monitors power supply loop parameters and device temperature in real time, can execute alarm and protection actions, realizes POE, DC, USB power supply and other multiple energy inputs, meets the use requirements of the portable mobile terminal on power supply safety, stability, controllability and power supply source diversity, and improves the reliability of the portable mobile terminal operation.

Description

Technical Field

[0001] This invention belongs to the field of portable mobile terminal technology, and in particular relates to a power supply device for portable mobile terminals. Background Technology

[0002] With the development of sensor, power electronics, information, and computer technologies, and their penetration into traditional industries, traditional equipment is being driven towards digitalization, networking, and intelligence, thereby improving the reliability, efficiency, and performance of the equipment.

[0003] Portable mobile terminals are a technological product of this context, primarily used in situations where there is no fixed external power supply. They are portable devices, mainly laptops, portable network access devices, and mobile communication terminals. The power supply, as the heart of mobile devices, primarily performs the conversion of electrical energy. Considering factors such as cost, efficiency, safety, and portability, traditional portable mobile terminals mainly use AC220V to charge a mobile battery pack, which then powers the mobile load.

[0004] Among them, traditional mobile power supply methods such as Figure 1 As shown, it mainly consists of a charger, a battery, and an output distribution unit, which then supply power to portable mobile terminals such as laptops, portable network access devices, and mobile communication terminals.

[0005] Disadvantages of traditional portable mobile device power supply: 1) Inability to promptly disconnect faulty power supply modules, resulting in poor reliability: Traditional mobile power supply methods cannot provide overcurrent or short-circuit protection. If any load fails, the portable mobile terminal may not be able to promptly disconnect the power supply, potentially affecting the operation of other modules (or units) in the same power supply system, thereby reducing the system's reliability; 2) Lack of equipment operation status monitoring function and lack of fault analysis data: The portable mobile terminal power supply method cannot monitor the power supply circuit parameters and the temperature inside the cabinet in real time, execute alarm and protection actions, and cannot provide support for equipment operation status monitoring and fault location. 3) The power distribution lacks timing control. When all modules (or units) in the portable mobile terminal are powered on at the same time, the starting current is large, which can easily generate a large surge current in the main power supply circuit, causing the overcurrent protection device to malfunction and resulting in power-on failure. 4) Unable to monitor and control the ambient temperature of portable mobile terminals in real time; 5) It is impossible to know the operating status of the portable mobile terminal's power supply in a timely manner through the communication port; 6) It cannot accept multiple DC power sources such as wind / solar / vehicle / shipborne / USB power supply, resulting in poor outdoor power supply performance; 7) Portability is achieved through a built-in battery pack, which increases the product's weight and cost. The battery also poses safety hazards and is not suitable for portable mobile terminals used in independently powered vehicles / ships. Summary of the Invention

[0006] To address the aforementioned issues, this invention proposes a portable mobile terminal power supply device that provides power to portable mobile devices while simultaneously monitoring power supply circuit parameters and internal temperature in real time. It can also perform alarm and protection actions and support multiple energy inputs, including PoE, DC, and USB power supply.

[0007] The objective of this invention is achieved through the following technical solution: a portable mobile terminal power supply device, comprising: Power input, including multiple energy input types; The input barrier circuit connects to the power supply input, combining the power supply inputs from multiple energy sources into one channel and converting it into a regulated DC output. The DC / DC converter circuit is connected to the output terminal of the input barrier circuit and converts the regulated DC output of the input barrier circuit into various DC outputs to the board.

[0008] Preferably, the power inputs include PoE input, DC input, and USB input.

[0009] Preferably, the input isolation circuit includes an EMI filter circuit, an input protection circuit, and a DC / DC module.

[0010] Preferably, after the PoE input is connected to the input barrier circuit, the EMI filter circuit, the input protection circuit, the first DC / DC module, and the output merging component are connected in sequence; after the DC input is connected to the input barrier circuit, the EMI filter circuit, the input protection circuit, the second DC / DC module, and the output merging component are connected in sequence; after the USB input is connected to the input barrier circuit, the EMI filter circuit, the hot-swap protection circuit, and the output merging component are connected in sequence.

[0011] Preferably, the output merging component is an ideal diode, which merges multiple outputs into one output to achieve power path switching and priority sorting.

[0012] Preferably, the ideal diode control chip works in conjunction with an external N-channel MOSFET, utilizing a 20mV forward voltage drop to achieve low-loss reverse protection and prevent backflow between multiple power supply inputs.

[0013] Preferably, the hot-swap protection circuit is equipped with an ideal diode controller that has surge suppression capabilities.

[0014] Preferably, the input protection circuit includes a fuse, input reverse connection protection, input soft start circuit, input overvoltage or freewheeling unidirectional TVS diode, and overcurrent and short circuit protection circuit.

[0015] Preferably, the EMI filter circuit includes multiple X capacitors and Y capacitors, all of which are safety-compliant capacitors; the EMI filter circuit also includes multiple inductors, which are set in relation to the filtering frequency.

[0016] Preferably, the DC input EMI filter circuit includes ceramic capacitors and solid aluminum electrolytic capacitors.

[0017] The beneficial effects of this invention are as follows: As can be seen from the above solution, the portable mobile terminal power supply device provided by the present invention provides power to portable mobile devices while monitoring the power supply circuit parameters and the internal temperature of the device in real time. It can perform alarm and protection actions, and realize multiple energy inputs such as POE, DC, and USB power supply. It meets the usage requirements of portable mobile terminals for power supply safety, stability, controllability, and diversity of power sources, and improves the reliability of portable mobile terminal operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a traditional mobile power supply method in an embodiment of the present invention; Figure 2 This is a block diagram of the portable mobile terminal integrated power supply device in an embodiment of the present invention; Figure 3 This is a schematic diagram of the combining control in an embodiment of the present invention; Figure 4 This is a schematic diagram of the DC / DC power supply hardware in an embodiment of the present invention; Figure 5 This is a schematic diagram of an ideal diode circuit in an embodiment of the present invention; Figure 6 This is a schematic diagram of the USB input protection circuit in an embodiment of the present invention; Figure 7 This is a schematic diagram of the input protection circuit in an embodiment of the present invention; Figure 8 This is a schematic diagram of a DC EMI filter circuit in an embodiment of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0020] The present invention provides a portable mobile terminal power supply device, relating to the fields of switching power supplies, power distribution, circuit protection, and portable mobile terminals, and particularly to intelligent power distribution, switching power supplies, and portable mobile terminals. The terminal includes: Power input, including multiple energy input types; The input barrier circuit connects to the power supply input, combining the power supply inputs from multiple energy sources into one channel and converting it into a regulated DC output. The DC / DC converter circuit is connected to the output terminal of the input barrier circuit and converts the regulated DC output of the input barrier circuit into various DC outputs to the board.

[0021] In one embodiment of the present invention, the power supply input includes a PoE input, a DC input, and a USB input.

[0022] In one embodiment of the present invention, the input barrier circuit includes an EMI filter circuit, an input protection circuit, and a DC / DC module.

[0023] like Figure 2 As shown, in one embodiment of the present invention, after the PoE input is connected to the input barrier circuit, it is sequentially connected to the EMI filter circuit, the input protection circuit, the first DC / DC module, and the output merging component; after the DC input is connected to the input barrier circuit, it is sequentially connected to the EMI filter circuit, the input protection circuit, the second DC / DC module, and the output merging component; after the USB input is connected to the input barrier circuit, it is sequentially connected to the EMI filter circuit, the hot-swap protection circuit, and the output merging component. Specifically: In the input isolation circuit: the POE input DC / DC power module output, the DC / DC power output, and the USB input are combined into a single output via ideal diodes to satisfy power path switching and priority sorting functions. The priority strategy for the integrated power supply device is: DC first, POE second, and USB power supply lowest priority; when the DC input is valid, the POE and DC / DC power supply paths, as well as the USB input power supply, are disconnected, stopping power supply; when the DC input and DC / DC power supply paths are invalid, the POE and DC / DC power supply paths are enabled, POE input is powered, and USB input power is disconnected; when both the POE and DC / DC power supply paths and the DC input and DC / DC power supply paths are invalid, USB power supply is enabled. Redundancy is achieved for the three power inputs through ideal diodes; failure of any one will not affect the other outputs. For example, if the DC input and DC / DC power supply output is 24.8V, the POE input and DC / DC power supply output is 24.0V, and the USB output is 5V~20V, after redundancy control (ideal diodes), the output voltage difference among the three achieves a priority power supply order of DC > POE > USB. Figure 3 As shown. In this embodiment, the first DC / DC power module converts the POE input (44V~57V) into a regulated DC output; the main circuit consists of an input protection circuit, an input EMI circuit, the first DC / DC module, and an output ideal diode. The second DC / DC power module converts the wind / solar / vehicle / shipborne DC input into a regulated DC output; similar to the DC / DC power module at the POE input, the DC input related circuit consists of an input protection circuit (anti-reverse connection and power-on inrush current suppression), a DC input EMI circuit, the second DC / DC module, and an output ideal diode, etc., converting the DC output (DC9V~36V) of the vehicle / shipborne or AC / DC power supply into a regulated DC output. The DC / DC power supply hardware schematic is shown in the figure. Figure 4 As shown.

[0024] In one embodiment of the present invention, the ideal diode control chip works in conjunction with an external N-channel MOSFET, utilizing a 20mV forward voltage drop to achieve low-loss reverse protection, preventing reverse flow between PoE / DC / USB power inputs. A schematic diagram of the ideal diode circuit is shown below. Figure 5 As shown.

[0025] In one embodiment of the invention, the USB power input protection circuit protects the device's USB output from hot-swapping or short circuits, preventing power supply failure. When the device input is short-circuited, an ideal diode controller directly implements overcurrent protection and fault alarm, preventing the short circuit from affecting device operation. The CSV24364 is an ideal diode controller with surge suppression, protecting the load from high-voltage transient damage. By controlling the voltage drop across an external N-MOS transmission device, the output can be limited and regulated during overvoltage. The CSV24364 also includes a timed current-limiting circuit breaker. In fault conditions, an adjustable fault timer must end before the transmission device is turned off, and the CSV24364 will automatically restart after a delay. The CSV24364 accurately monitors overvoltage and undervoltage conditions of the input power supply. The external MOS transistor remains off in the undervoltage state and automatically retryes in the overvoltage state. An integrated ideal diode controller drives a second MOS transistor, replacing a Schottky diode used for reverse output protection and output voltage protection. The USB input protection circuit is configured as follows: Figure 6 As shown.

[0026] In one embodiment of the present invention, the DC or PoE input protection circuit mainly consists of a fuse, input reverse connection protection, input soft-start circuit, input overvoltage or freewheeling unidirectional TVS diode, and overcurrent and short-circuit protection circuit. Its main function is to improve the power supply's adaptability to the input terminal. Figure 7As shown in the diagram: F2 is the input fuse, providing short-circuit protection for the power input terminal; varistor R7 and high-power TVS diode D33 are for peak voltage protection, absorbing and processing voltage spikes between +28V and GND_IN, mainly targeting transient high-energy interference from power lines such as CS106 and CS116; Q3 and Q5 are for startup current limiting, handling current surges at power-on and reverse connection protection, mainly for over-CE106; Y capacitors C85 and C36 are for single-board EMI circuitry to meet the electromagnetic compatibility requirements of the corresponding single board, working in conjunction with an external power filter to meet the system's electromagnetic compatibility testing requirements.

[0027] In one embodiment of the present invention, the EMI filter circuit includes multiple X capacitors and Y capacitors, all of which are safety capacitors; the EMI filter circuit also includes multiple inductors, which are configured to be linked to the filtering frequency. In this embodiment, the DC EMI filter is typically composed of a series inductor and a parallel capacitor. It utilizes the characteristics of inductance and capacitance to filter out high-frequency noise signals from the input, allowing only DC current to pass through and power subsequent circuits. The circuit diagram of the EMI filter is shown below. Figure 8 As shown in the diagram, C1, C2, and C3 are X capacitors, typically with a capacitance of 0.1μF to 2μF; Y1, Y2, Y3, and Y4 are Y capacitors, typically with a capacitance of 1nF to 4.7nF. Both X and Y capacitors are safety capacitors; failure of these capacitors will not cause electric shock or endanger personal safety. X capacitors are generally connected between DC+ and DC- to eliminate differential-mode interference signals, while Y capacitors are generally connected between DC+ / DC- and ground to eliminate common-mode interference signals. L1 and L2 are common-mode inductors. When a common-mode current flows through them, the magnetic flux directions of the two coils are the same, and their generated magnetic fields reinforce each other, suppressing common-mode signals. The values ​​of inductors L1 and L2 are related to the frequency to be filtered; according to technical specifications, the actual inductance values ​​of L1 and L2 are 2mH and 470uH, respectively. Differential-mode electromagnetic interference from DC input is mainly filtered out using low-ESL ceramic capacitors and solid aluminum electrolytic capacitors.

[0028] The above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A portable mobile terminal power supply device, characterized in that: The power supply device includes: Power input, including multiple energy input types; The input barrier circuit connects to the power supply input, combining the power supply inputs from multiple energy sources into one channel and converting it into a regulated DC output. The DC / DC converter circuit is connected to the output terminal of the input barrier circuit and converts the regulated DC output of the input barrier circuit into various DC outputs to the board.

2. The portable mobile terminal power supply device as described in claim 1, characterized in that: The power inputs include PoE input, DC input, and USB input.

3. The portable mobile terminal power supply device as described in claim 2, characterized in that: The input isolation circuit includes an EMI filter circuit, an input protection circuit, and a DC / DC module.

4. The portable mobile terminal power supply device as described in claim 3, characterized in that: After the POE input is connected to the input barrier circuit, it is sequentially connected to the EMI filter circuit, the input protection circuit, the first DC / DC module, and the output merging component; after the DC input is connected to the input barrier circuit, it is sequentially connected to the EMI filter circuit, the input protection circuit, the second DC / DC module, and the output merging component. After the USB input is connected to the input isolation circuit, the EMI filter circuit, hot-swap protection circuit, and output merging component are connected in sequence.

5. A portable mobile terminal power supply device as described in claim 4, characterized in that: The output merging component is an ideal diode, which merges multiple outputs into one output to achieve power path switching and priority sorting.

6. A portable mobile terminal power supply device as described in claim 5, characterized in that: The ideal diode control chip works in conjunction with an external N-channel MOSFET, utilizing a 20mV forward voltage drop to achieve low-loss reverse protection and prevent backflow between multiple power inputs.

7. A portable mobile terminal power supply device as described in claim 6, characterized in that: The hot-swap protection circuit is equipped with an ideal diode controller that has surge suppression capabilities.

8. A portable mobile terminal power supply device as described in claim 7, characterized in that: The input protection circuit includes a fuse, input reverse connection protection, input soft start circuit, input overvoltage or freewheeling unidirectional TVS diode, and overcurrent and short circuit protection circuit.

9. A portable mobile terminal power supply device as described in claim 8, characterized in that: The EMI filter circuit includes multiple X capacitors and Y capacitors, all of which are safety-compliant capacitors; the EMI filter circuit also includes multiple inductors, which are set in relation to the filtering frequency.

10. A portable mobile terminal power supply device as described in claim 9, characterized in that: The DC input EMI filter circuit is equipped with ceramic capacitors and solid aluminum electrolytic capacitors.

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