High-power-density ultra-thin 200W power adapter

Abstract

The utility model discloses a high-power-density ultra-thin 200W power adapter. A circuit structure of the power adapter comprises an AC input circuit, an EMI rectification filter circuit, a PFC power factor correction circuit, an LLC power conversion circuit, a rectification filter output circuit, a feedback voltage stabilizing circuit and a PFC / LLC master control IC circuit. According to the power adapter, the PFC power factor correction circuit, the LLC power conversion circuit and the efficient PFC and LLC integrated master control circuit are adopted, the efficiency can reach more than 95%, heating of components is reduced, the power supply design is simplified, and power consumption is reduced; according to the PFC and LLC integrated main control chip, devices with independent functions of PFC and LLC are combined into a whole, PFC and LLC level control signals are output at the same time, the number of peripheral elements is reduced, and the power adapter is high in power density and small in size.

Description

Technical Field

[0001] The utility model belongs to the technical field of power adapter production, and specifically relates to a high-power-density ultra-thin 200W power adapter. Background Art

[0002] Existing high-power power adapters, such as power adapters around 200W, generally have a relatively large volume, the components such as power MOS tubes generate a large amount of heat, the power efficiency is also relatively low, the control circuit design is not compact enough, there are many peripheral components, which also increases the production cost. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a high-power-density ultra-thin 200W power adapter for the above problems. By adopting an efficient PFC and LLC integrated main control circuit, the power conversion efficiency is improved, the heat generation of components is reduced, the use of heat sinks can be reduced, and a power adapter with high power density and ultra-thin volume can be produced.

[0004] The utility model is realized through the following technical solutions:

[0005] A high-power-density ultra-thin 200W power adapter, characterized in that: its circuit structure includes an AC input circuit, an EMI rectification and filtering circuit, a PFC power factor correction circuit, an LLC power conversion circuit, a rectification and filtering output circuit, a feedback voltage stabilization circuit and a PFC / LLC main control IC circuit; the AC input circuit is filtered by the EMI filter circuit of the EMI rectification and filtering circuit, and after being rectified by a rectifier bridge, it is output to the PFC power factor correction circuit. The PFC power factor correction circuit includes two parallel MOS tubes Q1 and Q2; the control electrodes of the MOS tubes Q1 and Q2 are both connected to the PFC control pin of the main control chip U1 of the PFC / LLC main control IC circuit, and the model of the main control chip U1 is SY5055A; the output end of the PFC power factor correction circuit is connected to the LLC power conversion circuit. The LLC power conversion circuit includes a power transformer T1 and MOS tubes Q3 and Q4 connected to the primary of the transformer T1. The control electrodes of the MOS tubes Q3 and Q4 are respectively connected to the half-bridge control pins of the main control chip U1 of the PFC / LLC main control IC circuit; the secondary of the transformer T1 of the LLC power conversion circuit is connected to the rectification and filtering output circuit. The rectification and filtering output circuit includes MOS tubes Q7 and Q6, and the control electrodes of the MOS tubes Q7 and Q6 are respectively connected to the control pins of the synchronous rectification control chip U3; the feedback voltage stabilization circuit is connected to the rectification and filtering output circuit, samples the output voltage of the rectification and filtering output circuit, and inputs it to the voltage comparison integrated chip U4. The output signal of the chip U4 is converted by the optocoupler chip U2 and then connected to the feedback input pin of the main control chip U1.

[0006] Further, a fusing fuse F1 and a varistor ZR1 are provided in the AC input circuit.

[0007] Further, the EMI rectifying and filtering circuit includes two rectifier bridge modules BD1 and BD2 connected in parallel.

[0008] Further, the model of the optocoupler chip U2 is PC817.

[0009] Further, the model of the chip U4 is LM393.

[0010] The beneficial effects of the present utility model are as follows: The power adapter circuit of the present utility model adopts a PFC power factor correction circuit and an LLC power conversion circuit, and adopts an efficient PFC and LLC integrated main control circuit, with an efficiency of over 95%, reducing the heat generation of components, simplifying the power supply design, and reducing power consumption; The PFC and LLC integrated main control chip combines the devices with independent PFC and LLC functions into one, and simultaneously outputs PFC and LLC stage control signals, reducing the number of peripheral components, with a high power density and small size of the power adapter. Description of the Drawings

[0011] Figure 1 is the circuit structure block diagram of the present utility model.

[0012] Figure 2 is the circuit diagram of the embodiment of the present utility model.

[0013] In the figure, 1. AC input circuit, 2. EMI rectifying and filtering circuit, 3. PFC power factor correction circuit, 4. LLC power conversion circuit, 5. Rectifying and filtering output circuit, 6. Feedback voltage stabilizing circuit, 7. PFC / LLC main control IC circuit. Detailed Embodiments

[0014] The present utility model will be further described below in conjunction with specific examples and the accompanying drawings of the specification.

[0015] Such as Figure 1 、 Figure 2As shown in the figure, a high-power-density ultra-thin 200W power adapter, its circuit structure includes an AC input circuit 1, an EMI rectification and filtering circuit 2, a PFC power factor correction circuit 3, an LLC power conversion circuit 4, a rectification and filtering output circuit 5, a feedback voltage stabilization circuit 6, and a PFC / LLC main control IC circuit 7; the AC input circuit 1 is filtered by the EMI filter circuit of the EMI rectification and filtering circuit 2, and after being rectified by two parallel rectifier bridge modules BD1 and BD2, it is output to the PFC power factor correction circuit 3. The PFC power factor correction circuit 3 includes two parallel MOS transistors Q1 and Q2; the control electrodes of the MOS transistors Q1 and Q2 are both connected to the PFC control pin of the main control chip U1 of the PFC / LLC main control IC circuit 7, and the model of the main control chip U1 is SY5055A. The output end of the PFC power factor correction circuit 3 is connected to the LLC power conversion circuit 4. The LLC power conversion circuit 4 includes a power transformer T1 and MOS transistors Q3 and Q4 connected to the primary of the transformer T1. The control electrodes of the MOS transistors Q3 and Q4 are respectively connected to the half-bridge control pins GATEH and GATEL of the main control chip U1 of the PFC / LLC main control IC circuit 7; the secondary of the transformer T1 of the LLC power conversion circuit 4 is connected to the rectification and filtering output circuit 5. The rectification and filtering output circuit 5 includes MOS transistors Q7 and Q6, and the control electrodes of the MOS transistors Q7 and Q6 are respectively connected to the control pins of the synchronous rectification control chip U3; the feedback voltage stabilization circuit 6 is connected to the rectification and filtering output circuit 5, samples the output voltage of the rectification and filtering output circuit 5, and inputs it to the voltage comparison integrated chip U4. The model of the chip U4 is LM393. The output signal of the chip U4 is converted by the optocoupler chip U2 and then connected to the feedback input pin FBL of the main control chip U1. The model of the optocoupler chip U2 is PC817.

[0016] The AC input circuit 1 is provided with a fuse F1 and a varistor ZR1.

[0017] The above embodiments are only the preferred embodiments of the present invention, which are only used to explain the present invention, rather than limiting the present invention. Any changes, substitutions, combinations, simplifications, modifications, etc. made by those skilled in the art without departing from the spirit and principle of the present invention shall be equivalent replacement methods and shall be included in the protection scope of the present invention.

Claims

1. A high-power-density ultra-thin 200W power adapter, characterized in that: Its circuit structure includes an AC input circuit, an EMI rectification and filtering circuit, a PFC power factor correction circuit, an LLC power conversion circuit, a rectification and filtering output circuit, a feedback voltage regulation circuit, and a PFC / LLC main control IC circuit; the AC input circuit is filtered by the EMI filtering circuit of the EMI rectification and filtering circuit and rectified by a rectifier bridge and then output to the PFC power factor correction circuit, and the PFC power factor correction circuit includes two parallel MOS transistors Q1 and Q2; the control electrodes of the MOS transistors Q1 and Q2 are both connected to the PFC control pin of the main control chip U1 of the PFC / LLC main control IC circuit, and the model of the main control chip U1 is SY5055A; the output end of the PFC power factor correction circuit is connected to the LLC power conversion circuit, and the LLC power conversion circuit includes a power transformer T1 and MOS transistors Q3 and Q4 connected to the primary of the transformer T1, and the control electrodes of the MOS transistors Q3 and Q4 are respectively connected to the half-bridge control pins of the main control chip U1 of the PFC / LLC main control IC circuit; the secondary of the transformer T1 of the LLC power conversion circuit is connected to the rectification and filtering output circuit, and the rectification and filtering output circuit includes MOS transistors Q7 and Q6, and the control electrodes of the MOS transistors Q7 and Q6 are respectively connected to the control pins of the synchronous rectification control chip U3; the feedback voltage regulation circuit is connected to the rectification and filtering output circuit, samples the output voltage of the rectification and filtering output circuit, and inputs it to the voltage comparison integrated chip U4, and the output signal of the chip U4 is converted by the optocoupler chip U2 and then connected to the feedback input pin of the main control chip U1.

2. The high-power density ultra-thin 200W power adapter according to claim 1, wherein: The AC input circuit is provided with a fuse F1 and a varistor ZR1.

3. The high-power density ultra-thin 200W power adapter according to claim 1, characterized in that: The EMI rectification and filtering circuit includes two parallel rectifier bridge modules BD1 and BD2.

4. The high-power density ultra-thin 200W power adapter according to claim 1, characterized in that: The model of the optocoupler chip U2 is PC817.

5. The high-power density ultra-thin 200W power adapter according to claim 1, wherein: The model of the chip U4 is LM393.

Images