Multi-port fast charging circuit and device

Abstract

This utility model discloses a multi-port fast charging circuit and device. The circuit includes a power conversion module, a control output module, and multiple output ports. The power conversion module is connected to the control output module, which includes multiple output units. Each output unit includes a switching element and an energy storage element. Each output unit is connected to an output port for connecting to a charging device. The energy storage element is configured to supply power to the charging device when the switching element is off. The control output module controls the switching element of the output unit with the lowest output voltage to turn on, while the other switching elements are turned off, and feeds back the output voltage signal to the power conversion module. The power conversion module is configured to receive the output voltage signal and adjust the output voltage to charge the energy storage element of that output unit. This utility model helps reduce circuit complexity and improve output voltage regulation efficiency, and facilitates the realization of fast charging functionality for each output port.

Description

Technical Field

[0001] This utility model relates to the field of charging technology, and in particular to a multi-port fast charging circuit and device. Background Technology

[0002] In current charging technologies, when multiple outputs are used and fast charging functionality is maintained, the common approach is to use a separate flyback constant voltage circuit on the primary side of the transformer, with multiple DC-DC converters added on the secondary side, or to use multiple flyback circuits on the primary side, with each flyback circuit corresponding to a different secondary side. Both of these solutions result in either complex circuitry and large size, or low efficiency and high cost. Utility Model Content

[0003] The purpose of this invention is to provide a multi-port fast charging circuit and device, which helps to reduce the complexity of the circuit and improve the efficiency of output voltage regulation.

[0004] To achieve the above objectives, this utility model provides a multi-port fast charging circuit, including a power conversion module, a control output module, and multiple output ports. The power conversion module is connected to the control output module, and the control output module includes multiple output units. Each output unit includes a switching element and an energy storage element. Each output unit is connected to one output port, and the output port is used to connect to a charging device. The energy storage element is configured to supply power to the charging device when the switching element is turned off.

[0005] The control output module is configured to acquire the output voltage signal of each of the output ports, control the switching element of the output unit with the lowest output voltage to turn on, and turn off the other switching elements, and feed the output voltage signal back to the power conversion module;

[0006] The power conversion module is configured to adjust the output voltage based on the output voltage signal fed back by the control output module in order to charge the energy storage element of the output unit with the lowest output voltage.

[0007] Optionally, the power conversion module includes a primary controller, a main switching element, and a transformer. The primary controller is connected to the control terminal of the main switching element, and the transformer is connected to the main switching element and the control output module.

[0008] The primary controller is connected to the control output module. The primary controller receives the output voltage signal and adjusts the main switching element based on the output voltage signal of the output unit with the lowest output voltage to adjust the output voltage of the transformer.

[0009] Optionally, the transformer is configured to store energy when the main switching element is turned on and release energy to power the control output module when the main switching element is turned off.

[0010] Optionally, the power conversion module further includes a spike absorption circuit, which is connected to the main switching element.

[0011] Optionally, the primary side of the transformer includes a main winding and a secondary winding, the main winding being connected to the spike absorption circuit, and the secondary winding being connected to the primary controller;

[0012] The control output module is connected to the secondary side of the transformer.

[0013] Optionally, the control output module further includes a secondary controller, with each of the output units connected to the secondary controller, which is configured to control the on / off state of each of the switching elements based on the output voltage signal.

[0014] Optionally, the multi-port fast charging circuit further includes a primary-secondary communicator, which is connected to the primary controller and the secondary controller respectively. The secondary controller feeds back the output voltage signal to the primary controller through the primary-secondary communicator.

[0015] Optionally, the primary and secondary communicators are optocouplers or magnetic couplers, with the input side of the primary and secondary communicators connected to an output terminal of the secondary controller, and the output side of the primary and secondary communicators connected to an input terminal of the primary controller.

[0016] Optionally, the control output module further includes multiple voltage detection units, which are connected to the secondary controller, and each voltage detection unit is connected to one of the output ports.

[0017] To achieve the above objectives, this utility model provides a multi-port fast charging device, including the multi-port fast charging circuit as described above.

[0018] In this embodiment of the invention, the multi-port fast charging circuit includes a power conversion module, a control output module, and multiple output ports. The power conversion module and the multiple output ports are connected to the control output module. The output ports are used to connect to charging devices. The control output module includes multiple output units, each equipped with an energy storage element. The energy storage element can supply power to each charging device when the switching element is off. Each output unit is connected to an output port. The control output module acquires the output voltage signal of each output port, controls the switching element of the output unit with the lowest output voltage to turn on, and turns off the other switching elements. The control output module feeds back the output voltage signal to the power conversion module. The power conversion module adjusts the output voltage based on the received output voltage signal to charge the energy storage element of the output unit with the lowest voltage. This invention acquires the output voltage of each output port through the control output module and feeds it back to the power conversion module. The power conversion module regulates the output voltage. Since there is only one control output module and one power conversion module, it helps to reduce the complexity of the circuit and improve the output voltage regulation efficiency. Furthermore, by adjusting the output voltage according to the feedback voltage signal, and by charging the energy storage element of the output unit with the lowest voltage, the corresponding output port can obtain the required voltage. The charging devices of other output ports are charged through the energy storage element, which can realize the fast charging function of the charging devices of other output ports, and can also increase the voltage of the output port so that the output port can meet the fast charging conditions as soon as possible. Attached Figure Description

[0019] Figure 1 This is a circuit diagram of a multi-port fast charging circuit in an embodiment of this utility model. Detailed Implementation

[0020] To explain in detail the technical content, structural features, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0021] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0022] Please see Figure 1This utility model discloses a multi-port fast charging circuit, including a power conversion module 10, a control output module 20, and multiple output ports (Vout1, Vout2...Voutn). The power conversion module 10 is connected to the control output module 20, which includes multiple output units 30. Each output unit 30 includes a switching element (SW1, SW2...SWn) and an energy storage element (C1, C2...Cn). Each output unit 30 is connected to one output port, which is used to connect to a charging device. The energy storage element is configured to supply power to the charging device when the switching element is turned off. The control output module 20 is configured to acquire the output voltage signal of each output port, control the switching element of the output unit 30 with the lowest output voltage to turn on, and turn off the other switching elements, and feed back the output voltage signal to the power conversion module 10. The power conversion module 10 is configured to adjust the output voltage according to the output voltage signal fed back by the control output module 20 to charge the energy storage element of the output unit 30.

[0023] It is understood that the number of output ports and output units 30 in this utility model can be two or more, and this utility model does not limit this.

[0024] In the specific example, each output unit 30 contains one switching element and one energy storage element. Of course, this invention does not limit this.

[0025] In this embodiment of the invention, the multi-port fast charging circuit includes a power conversion module 10, a control output module 20, and multiple output ports. The power conversion module 10 and the multiple output ports are connected to the control output module 20. The output ports are used to connect to charging devices. The control output module 20 includes multiple output units 30, each equipped with an energy storage element. The energy storage element can supply power to the charging device when the switching element is turned off. Each output unit 30 is connected to an output port. The control output module 20 acquires the output voltage signal of each output port, controls the switching element of the output unit 30 with the lowest output voltage to turn on, and turns off the other switching elements. The control output module 20 feeds back the output voltage signal to the power conversion module 10. The power conversion module 10 adjusts the output voltage based on the received output voltage signal to charge the energy storage element of the output unit 30 with the lowest voltage. This invention acquires the output voltage of each output port through the control output module 20 and feeds it back to the power conversion module 10. The power conversion module 10 regulates the output voltage. Since there is only one control output module 20 and one power conversion module 10, the complexity of the circuit is reduced and the output voltage regulation efficiency is improved. Furthermore, by adjusting the output voltage according to the feedback voltage signal, the energy storage element of the output unit 30 with the lowest voltage is charged, so that the corresponding output port can obtain the required voltage. The charging devices of other output ports are charged through the energy storage element, which can realize the fast charging function of the charging devices of other output ports, and can also increase the voltage of the output port so that the output port can meet the fast charging conditions as soon as possible.

[0026] In some embodiments, the power conversion module 10 includes a primary controller 40, a main switching element Q1, and a transformer T1. The primary controller 40 is connected to the control terminal of the main switching element Q1, and the transformer T1 is connected to the main switching element Q1 and the control output module 20.

[0027] The primary controller 40 is connected to the control output module 20. The primary controller 40 receives the output voltage signal fed back by the control output module 20 and adjusts the main switching element Q1 based on the output voltage signal of the output unit 30 with the lowest output voltage to adjust the output voltage of the transformer T1.

[0028] In a specific example, the main switching element Q1 and each switching element can be a MOSFET and a transistor; however, this invention does not limit this.

[0029] It should be understood that the circuit of this utility model is a flyback circuit. The primary controller 40 adjusts the duty cycle of the main switching element Q1 based on the output voltage signal through PWM (Pulse Width Modulation) and PFM (Pulse Frequency Modulation) to regulate the output voltage.

[0030] Specifically, transformer T1 is configured to store energy when the main switching element Q1 is turned on, and release energy to power the control output module 20 when the main switching element Q1 is turned off. It can be understood that in the flyback circuit, when the main switching element Q1 is turned on, the electrical energy of the input voltage is stored in transformer T1 in the form of magnetic energy; when the main switching element Q1 is turned off, the energy of transformer T1 can be released into the control output module 20 to be released to the charging device through the output port.

[0031] In some embodiments, the power conversion module 10 further includes a spike absorption circuit 50, which is connected to the main switching element Q1.

[0032] Specifically, the control terminal of the main switching element Q1 is connected to the primary controller 40, the first terminal of the main switching element Q1 is connected to the spike absorption circuit 50 and the primary side of the transformer T1, and the second terminal of the main switching element Q1 is connected to the power input terminal Vin through the first resistor RCS.

[0033] Specifically, the spike absorption circuit 50 is connected to the power input terminal Vin. The spike absorption circuit 50 includes a first capacitor C0, a second resistor R2 and a first diode D1. The first capacitor C0 and the second resistor R2 are connected in parallel. The anode of the first diode D1 is connected to the first terminal of the main switching element Q1, and the cathode of the first diode D1 is connected to the first capacitor C0 and the second resistor R2.

[0034] Specifically, the primary side of transformer T1 includes a main winding and a secondary winding. The main winding is connected to the spike absorption circuit 50, the secondary winding is connected to the primary controller 40, and the secondary side of transformer T1 is connected to the control output module 20.

[0035] Furthermore, the main winding is connected to the first end of the main switching element Q1, one end of the auxiliary winding is connected to the power input terminal Vin, and the other end is connected to the primary controller 40 through the input unit 60.

[0036] Specifically, the input unit 60 includes a second diode D2, a third resistor R3, and a second capacitor Cin. The anode of the second diode D2 is connected to the secondary winding, and the cathode of the second diode D2 is connected to the first end of the third resistor R3. The second end of the third resistor R3 is connected to the primary controller 40. The first end of the second capacitor Cin is connected to the power input terminal Vin, and the second end of the second capacitor Cin is connected to the second end of the third resistor R3.

[0037] In some embodiments, the control output module 20 further includes a secondary controller 70, with each output unit 30 connected to the secondary controller 70, which is configured to control the on / off state of each switching element based on the output voltage signal.

[0038] Specifically, the secondary controller 70 is connected to the control terminal of each switching element, the first terminal of each switching element is connected to the secondary side of the transformer T1, and the second terminal of each switching element is connected to the corresponding energy storage element.

[0039] In specific examples, the primary controller 40 and the secondary controller 70 can be components such as ICs, protocol ICs, or MCUs, and this utility model does not limit them.

[0040] In some embodiments, the multi-port fast charging circuit further includes a primary-secondary communicator U1, which is connected to the primary controller 40 and the secondary controller 70 respectively. The secondary controller 70 feeds back the output voltage signal to the primary controller 40 through the primary-secondary communicator U1.

[0041] Specifically, the primary and secondary communicator U1 is an optocoupler or a magnetic coupler. The input side U1A of the primary and secondary communicator U1 is connected to an output terminal of the secondary controller 70, and the output side U1B of the primary and secondary communicator U1 is connected to an input terminal of the primary controller 40. The secondary controller 70 inputs an electrical signal to the input side U1A of the primary and secondary communicator U1 based on the output voltage signal. The input side U1A generates a transmission signal based on the input electrical signal (when the primary and secondary communicator U1 is an optocoupler, the transmission signal is an optical signal; when the primary and secondary communicator U1 is a magnetic coupler, the transmission signal is a magnetic signal). The output side U1B receives the transmission signal and generates an electrical signal. The input terminal of the primary controller 40 obtains the electrical signal from the output side U1B to control the output of the output terminal, thereby regulating the main switching element Q1.

[0042] In a specific example, the primary and secondary communicators U1 are optocouplers, the input side U1A is a light-emitting diode, and the output side U1B is a photosensitive element.

[0043] It is understood that the primary and secondary communicator U1 can also be other components, and this utility model does not limit this.

[0044] In some embodiments, the control output module 20 further includes a plurality of voltage detection units 80, which are connected to the secondary controller 70. Each voltage detection unit 80 is connected to an output port. The voltage detection unit 80 acquires the output voltage signal through the output port and inputs the output voltage signal into the secondary controller 70 through each of the input terminals of the secondary controller 70.

[0045] Specifically, each voltage detection unit 80 includes a fourth resistor R4 and a fifth resistor R5. Of course, this invention does not limit this aspect.

[0046] Specifically, the energy storage element is a capacitor, but this application does not limit this.

[0047] This utility model embodiment also provides a multi-port fast charging device, including the multi-port fast charging circuit as described above.

[0048] In summary, the multi-port fast charging circuit and device of this utility model uses a single winding on the secondary side of transformer T1, controls each output port through a single secondary controller 70, and obtains the output voltage of each output port through each voltage detection unit 80 to control the switching elements of each output port. This eliminates the need for multiple DC-DC converters on the secondary side of transformer T1 and multiple flyback circuits, thus achieving voltage regulation of each output port and realizing fast charging function for each output port. This reduces circuit complexity and improves output voltage regulation efficiency. In addition, it also helps to reduce circuit size and lower production costs.

[0049] The above-disclosed examples are merely preferred embodiments of the present utility model, intended to facilitate understanding and implementation by those skilled in the art. They should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the scope of the present utility model patent shall still fall within the scope of the present utility model.

Claims

1. A multi-port fast charging circuit, characterized in that, The device includes a power conversion module, a control output module, and multiple output ports. The power conversion module is connected to the control output module. The control output module includes multiple output units, each of which includes a switching element and an energy storage element. Each output unit is connected to an output port, which is used to connect to a charging device. The energy storage element is configured to supply power to the charging device when the switching element is turned off. The control output module is configured to acquire the output voltage signal of each output port, control the switching element of the output unit with the lowest output voltage to turn on, and turn off the other switching elements, and feed the output voltage signal back to the power conversion module; The power conversion module is configured to adjust the output voltage based on the output voltage signal fed back by the control output module in order to charge the energy storage element of the output unit with the lowest output voltage.

2. The multi-port fast charging circuit as described in claim 1, characterized in that, The power conversion module includes a primary controller, a main switching element, and a transformer. The primary controller is connected to the control terminal of the main switching element, and the transformer is connected to the main switching element and the control output module. The primary controller is connected to the control output module. The primary controller receives the output voltage signal and adjusts the main switching element based on the output voltage signal of the output unit with the lowest output voltage to adjust the output voltage of the transformer.

3. The multi-port fast charging circuit as described in claim 2, characterized in that, The transformer is configured to store energy when the main switching element is turned on and release energy to power the control output module when the main switching element is turned off.

4. The multi-port fast charging circuit as described in claim 2, characterized in that, The power conversion module also includes a spike absorption circuit, which is connected to the main switching element.

5. The multi-port fast charging circuit as described in claim 4, characterized in that, The primary side of the transformer includes a main winding and a secondary winding. The main winding is connected to the spike absorption circuit, and the secondary winding is connected to the primary controller. The control output module is connected to the secondary side of the transformer.

6. The multi-port fast charging circuit as described in claim 4, characterized in that, The control output module further includes a secondary controller, and each of the output units is connected to the secondary controller. The secondary controller is configured to control the on / off state of each of the switching elements based on the output voltage signal.

7. The multi-port fast charging circuit as described in claim 6, characterized in that, The multi-port fast charging circuit also includes a primary-secondary communicator, which is connected to the primary controller and the secondary controller respectively. The secondary controller feeds back the output voltage signal to the primary controller through the primary-secondary communicator.

8. The multi-port fast charging circuit as described in claim 7, characterized in that, The primary and secondary communicators are optocouplers or magnetic couplers. The input side of the primary and secondary communicators is connected to one output terminal of the secondary controller, and the output side of the primary and secondary communicators is connected to one input terminal of the primary controller.

9. The multi-port fast charging circuit as described in claim 6, characterized in that, The control output module further includes multiple voltage detection units, which are connected to the secondary controller, and each voltage detection unit is connected to one of the output ports.

10. A multi-port fast charging device, characterized in that, Includes the multi-port fast charging circuit as described in any one of claims 1 to 9.

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