Dual-channel power supply switching circuit

Abstract

The utility model discloses a dual-channel power supply switching circuit, which comprises an MCU unit, a first DCDC module, a second DCDC module and a switching unit, and is characterized in that the MCU unit comprises a micro-processing chip; the switching unit comprises a multiplexer and a relay, the input end of the multiplexer is in signal connection with the MCU unit, and the output end of the multiplexer is connected with the input end of the first DCDC module and the input end of the second DCDC module; the relay switch is respectively connected with the output end of the first DCDC module and the output end of the second DCDC module, is in signal connection with the MCU unit, and is used for combining and outputting the first DCDC module and the second DCDC module through switching on the relay switch so as to switch a single channel from double channels. The single channel is in a high-power output state, the double channels are in a medium-and-small-power output state, the double channels and the single channel are switched, and the multiplexer and relay switch enable signals are controlled by the MCU processor to be switched.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, specifically to a dual-channel power switching circuit. Background Technology

[0002] In the display industry, with the development of display technology, large-size screens are becoming increasingly common in home, commercial, and industrial applications. These screens typically require high-power power supplies to provide sufficient brightness and color saturation. Power supply technology for large-size screens is crucial to ensuring stable operation.

[0003] To meet high power demands while maintaining compatibility with the existing power supply system, as shown in the attached document... Figure 1 As shown, the screen employs a dual-phase to four-phase power supply design. A multi-phase controller can improve the efficiency of the power system. By distributing current across multiple phases, the current in each phase is reduced, thereby reducing losses in resistance, wires, and components. This helps reduce output ripple. Distributing power across multiple phases also reduces output current ripple, helping to reduce power supply noise and improve system stability. However, this solution does not adequately address low-to-medium power requirements for dual channels. Furthermore, because both channels are designed for high-power operation, performance redundancy, a large number of electronic components, and a large PCB area result in higher costs and a disadvantageous position. Utility Model Content

[0004] To overcome the above-mentioned shortcomings, the purpose of this utility model is to provide a dual-channel power switching circuit to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts a dual-channel power switching circuit, comprising an MCU unit, a first DC-DC module, a second DC-DC module, and a switching unit, wherein:

[0006] The MCU unit includes a microprocessor chip.

[0007] The switching unit includes a multiplexer and a relay switch. The input terminal of the multiplexer is connected to the signal of the MCU unit, and the output terminal is connected to the input terminal of the first DC-DC module and the input terminal of the second DC-DC module, respectively.

[0008] The relay switch is connected to the output terminals of the first DCDC module and the second DCDC module respectively, and is also connected to the MCU unit signal. It is used to combine the outputs of the first DCDC module and the second DCDC module by turning on the relay switch, so as to switch from dual-channel to single-channel.

[0009] Preferably, the first DC-DC module includes a first DC controller, a second DC controller, and a first load. The first DC controller and the second DC controller are connected in parallel, the input terminal of the first DC controller is connected to the output terminal of the multiplexer, the output terminal is connected to one end of the first load, and the other end of the first load is grounded.

[0010] Preferably, the second DC-DC module includes a third DC controller, a fourth DC controller, and a second load. The third DC controller and the fourth DC controller are connected in parallel. The input terminal of the third DC controller is connected to the output terminal of the multiplexer, and the output terminal is connected to one end of the second load, while the other end of the second load is grounded.

[0011] Preferably, the first DC controller, the second DC controller, the third DC controller, and the fourth DC controller operate in phase synchronization.

[0012] Preferably, the first DC-DC module further includes a first capacitor, a first inductor, and a second inductor. The first inductor is connected in series between the first DC controller and the first load. The output terminal of the second DC controller is connected in series with the second inductor and the first capacitor to the other end of the first load.

[0013] Preferably, the second DC-DC module further includes a second capacitor, a third inductor, and a fourth inductor. The third inductor is connected in series between the third DC controller and the second load. The output terminal of the fourth DC controller is connected in series with the fourth inductor and the relay switch, and is connected to the node between the first inductor and the first load. The second capacitor is connected in parallel across the two ends of the second load.

[0014] Compared with the prior art, the beneficial effects of this utility model's technical solution are:

[0015] Existing technologies employ performance redundancy, with both channels designed for high-power supply. This results in a large number of electronic components and a large PCB area, leading to higher costs and a disadvantage. The dual-channel power switching circuit provided in this application, by combining low-power outputs in two channels with high-power outputs in a single channel, saves on the high-power components and PCB layout of one channel, reducing hardware and software development costs. Furthermore, by utilizing relays and multiplexers for switching technology, it can automatically adjust and switch between single-channel and dual-channel power outputs. Attached Figure Description

[0016] Figure 1 This is a diagram of a dual-channel circuit in the prior art;

[0017] Figure 2This is a circuit structure diagram of an embodiment of a dual-channel power switching circuit according to the present invention;

[0018] In the picture:

[0019] 10. First DC controller; 11. Second DC controller; 12. Third DC controller; 13. Fourth DC controller. Detailed Implementation

[0020] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0021] Figure 2 The diagram shows a circuit structure of a dual-channel power switching circuit provided in an embodiment of the present invention.

[0022] like Figure 2 As shown, the technical solution adopted by this utility model is a dual-channel power switching circuit, including an MCU unit, a first DC-DC module, a second DC-DC module, and a switching unit, wherein:

[0023] The MCU unit includes a microprocessor chip.

[0024] The switching unit includes a multiplexer and a relay switch. The input terminal of the multiplexer is connected to the signal of the MCU unit, and the output terminal is connected to the input terminal of the first DC-DC module and the input terminal of the second DC-DC module, respectively.

[0025] The relay switch KJ1 is connected to the output terminals of the first DCDC module and the second DCDC module respectively, and is also connected to the MCU unit signal. It is used to combine the outputs of the first DCDC module and the second DCDC module by turning on the relay switch KJ1, so as to switch from dual-channel to single-channel.

[0026] The dual-channel power switching circuit provided in this application operates as follows: single-channel for high-power output and dual-channel for low-to-medium power output. In the low-to-medium power dual-channel mode, relay switch KJ1 and the multiplexer are turned on, allowing for independent power supply to both channels. When a single-channel high-power supply is required, relay switch KJ1 and the multiplexer are turned on, converting the dual-phase dual-channel power supply into a single-channel four-phase high-power supply. This switching between dual-channel and single-channel operation is controlled by an MCU processor, which controls the enable signals of the multiplexer and relay switch KJ1.

[0027] Specifically, the MCU module mainly consists of a microprocessor chip, whose function is to enable the power supply and set the output voltage. The host computer controls the processor via gigabit network to change the channel state. Single channel is for high-power output, while dual channel is for medium-to-low-power output. Switching between high-power single channel and medium-to-low-power dual channel involves two parts: power supply switching and control signal switching. For power supply switching, a relay switch KJ1 is used. For control signal switching, a multiplexer is used, including soft-start, loop compensation, enable signals, and feedback signals between the DC controller and the multiplexer.

[0028] In some embodiments, reference Figure 2 The first DC-DC module includes a first DC controller 10, a second DC controller 11, and a first load R1. The first DC controller 10 and the second DC controller 11 are connected in parallel. The input terminal of the first DC controller 10 is connected to the output terminal of the multiplexer, and the output terminal is connected to one end of the first load R1. The other end of the first load R1 is grounded.

[0029] Furthermore, the second DC-DC module includes a third DC controller 12, a fourth DC controller 13, and a second load R2. The third DC controller 12 and the fourth DC controller 13 are connected in parallel. The input terminal of the third DC controller 12 is connected to the output terminal of the multiplexer, and the output terminal is connected to one end of the second load R2. The other end of the second load R2 is grounded.

[0030] For example, in a high-power single-channel configuration, the high-power power supply forms an interleaved parallel synchronous buck topology structure with a first DC controller 10, a second DC controller 11, a third DC controller 12, and a fourth DC controller 13, and the parallel multiphase configuration realizes distributed heat source pressure and distributed heat dissipation management.

[0031] In some embodiments, the first DC controller 10, the second DC controller 11, the third DC controller 12, and the fourth DC controller 13 operate in phase synchronization.

[0032] For example, the purpose of phase synchronization is to reduce voltage and current differences between phases and ensure that the voltage and current of each phase are synchronized. This improves power supply efficiency, reduces ripple, enhances system stability, and reduces thermal stress on devices. Synchronization control allows for more balanced output current across phases, thereby improving the overall performance and reliability of the power supply. In high-power applications, this effectively increases the power density and efficiency of the power supply.

[0033] In some embodiments, reference Figure 2 The first DC-DC module further includes a first capacitor C1, a first inductor L1, and a second inductor L2. The first inductor L1 is connected in series between the first DC controller 10 and the first load R1. The output terminal of the second DC controller 11 is connected in series with the second inductor L2 and the first capacitor C1 to the other end of the first load R1.

[0034] The second DC-DC module further includes a second capacitor C2, a third inductor L3, and a fourth inductor L4. The third inductor L3 is connected in series between the third DC controller 12 and the second load R2. The output terminal of the fourth DC controller 13 is connected in series with the fourth inductor L4 and the relay switch KJ1, and is connected to the node between the first inductor L1 and the first load R1. The second capacitor C2 is connected in parallel across the two ends of the second load R2.

[0035] For example, the inductors and capacitors in the first and second DC-DC modules respectively form output filters. In the Buck circuit, high-frequency switching noise is generated due to the switching action. The LC filter provides a low-impedance path for the high-frequency voltage component through the combination of inductors and capacitors, reflecting the high-frequency ripple back to ground, thereby reducing the output voltage ripple and suppressing power supply noise.

[0036] The dual-channel power switching circuit provided in this application can switch between single-channel high power and dual-channel low-power, which is convenient and fast. It can meet the requirements of switching between dual-channel low-current and single-channel high-current for OLEDs, avoiding the need to reserve a dedicated channel for high-power screens. In daily use, low-power screens can use multiple channels, which saves a considerable amount of costs.

[0037] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They cannot be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A dual-channel power switching circuit, characterized in that, It includes an MCU unit, a first DC-DC module, a second DC-DC module, and a switching unit, wherein: The MCU unit includes a microprocessor chip; The switching unit includes a multiplexer and a relay switch. The input terminal of the multiplexer is connected to the signal of the MCU unit, and the output terminal is connected to the input terminal of the first DC-DC module and the input terminal of the second DC-DC module, respectively. The relay switch is connected to the output terminals of the first DCDC module and the second DCDC module respectively, and is also connected to the MCU unit signal. It is used to combine the outputs of the first DCDC module and the second DCDC module by turning on the relay switch, so as to switch from dual-channel to single-channel.

2. The dual-channel power switching circuit according to claim 1, characterized in that, The first DC-DC module includes a first DC controller, a second DC controller, and a first load; the first DC controller and the second DC controller are connected in parallel, the input terminal of the first DC controller is connected to the output terminal of the multiplexer, the output terminal is connected to one end of the first load, and the other end of the first load is grounded.

3. The dual-channel power switching circuit according to claim 2, characterized in that, The second DC-DC module includes a third DC controller, a fourth DC controller, and a second load; the third DC controller and the fourth DC controller are connected in parallel, the input terminal of the third DC controller is connected to the output terminal of the multiplexer, the output terminal is connected to one end of the second load, and the other end of the second load is grounded.

4. The dual-channel power switching circuit according to claim 3, characterized in that, The first DC controller, the second DC controller, the third DC controller, and the fourth DC controller operate in phase synchronization.

5. The dual-channel power switching circuit according to claim 4, characterized in that, The first DC-DC module further includes a first capacitor, a first inductor, and a second inductor; the first inductor is connected in series between the first DC controller and the first load; the output terminal of the second DC controller is connected in series with the second inductor and the first capacitor to the other end of the first load.

6. The dual-channel power switching circuit according to claim 5, characterized in that, The second DC-DC module further includes a second capacitor, a third inductor, and a fourth inductor; the third inductor is connected in series between the third DC controller and the second load; the output terminal of the fourth DC controller is connected in series with the fourth inductor and the relay switch to the node between the first inductor and the first load; the second capacitor is connected in parallel across the two ends of the second load.

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