Control circuit of gallium nitride charger

Abstract

A control circuit of a gallium nitride charger comprises an electromagnetic suppression module, a rectifier module, a filter module, a master controller, a driver, a primary optocoupler module, a secondary optocoupler module and a transformer T. The electromagnetic suppression module is connected with the rectifier module, the rectifier module is connected with the filter module, the filter module is connected with the master controller, the master controller is arranged on the primary side of the transformer T, and the secondary optocoupler module is connected with the driver. The primary optocoupler module is arranged on one side of the secondary side of the transformer T and connected with the main controller, the main controller is connected with a switching circuit module, the switching circuit module is connected with the primary side of the transformer T, the secondary optocoupler module is arranged on one side of the secondary side of the transformer T and connected with the driver, and the driver is connected with the secondary side of the transformer T and connected with an output end. The DC-DC converter is stable in output and high in conversion efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to a charger technical field, concretely speaking, a gallium nitride charger's control circuit. BACKGROUND

[0002] Gallium nitride charger is a kind of charger using gallium nitride (GaN) semiconductor material manufacturing.Compared with traditional silicon-based charger, gallium nitride charger has higher power density and higher efficiency, can realize faster charging speed, shortens charging time;Since gallium nitride material has higher electron mobility and smaller power loss, therefore, gallium nitride charger can be designed smaller and more portable, convenient to carry.Gallium nitride technology has broad application prospect in the field of charger, and can become mainstream charger technology in the future.

[0003] The voltage in the circuit structure of the current gallium nitride charger is prone to instability problems, and it is difficult to feedback in time. SUMMARY

[0004] To solve the above technical problems, the application provides a gallium nitride charger control circuit.

[0005] To solve the above technical problems, the application adopts the following technical solutions:

[0006] A gallium nitride charger control circuit, comprising an electromagnetic suppression module, a rectifier module, a filter module, a main control unit, a driver, a primary optical coupling module, a secondary optical coupling module and a transformer T, the electromagnetic suppression module is connected with the rectifier module, the rectifier module is connected with the filter module, the filter module is connected with the main control unit, the main control unit is arranged on the primary side of the transformer T, the primary optical coupling module is arranged on the secondary side of the transformer T and connected with the main control unit, the main control unit is connected with a switching circuit module, the switching circuit module is connected with the primary of the transformer T, the secondary optical coupling module is arranged on the secondary side of the transformer T and connected with the driver, the driver is connected with the secondary of the transformer T, and the driver is connected with an output end.

[0007] The electromagnetic suppression module comprises filter inductance LF1, filter inductance LF2, capacitor CY1, capacitor CY2 and capacitor CX1, capacitor CY1 and capacitor CY2 are connected in series and then connected on both sides of filter inductance LF1, filter inductance LF1 is connected with filter inductance LF2 through capacitor CX1, both ends of filter inductance LF2 are connected with diode D1 and diode D2, and filter inductance LF2 is connected with the rectifier module.

[0008] The primary feedback module is an optical coupler U2B, which is connected with a master controller through a resistor R10, the master controller is connected with a triode Q2, the base of the triode Q2 is grounded through a stabilizing diode Z1, the collector of the triode Q2 is connected with the primary of a transformer T through a diode D4 and an inductor L1, and the diode D4 is connected with a resistor R6 and a capacitor C5.

[0009] The switch circuit module comprises a MOS tube Q1, the gate of the MOS tube Q1 is connected with a master controller through a resistor R11, the resistor R11 is connected with a resistor R12, the resistor R12 is connected with a diode D6, the diode D6 is connected with a capacitor C3 and the gate of the MOS tube Q1, the drain of the MOS tube Q1 is connected with a diode D3, the diode D3 is connected with a resistor R5 and a resistor R5A in parallel, the resistor R5 and the resistor R5A in parallel are connected with a capacitor C2 and then connected to the primary of the transformer T, the rectifier module and the filter module are connected and then connected to the primary of the transformer T, the source of the MOS tube Q1 is grounded and connected with the gate through a resistor R13.

[0010] The secondary optical coupler module comprises an optical coupler U2A, which is connected with a driver through a resistor R19 and a resistor R17, the optical coupler U2A is connected with a capacitor C14, the capacitor C14 is connected with a resistor R22, the capacitor C14 is connected with a resistor R23 and a capacitor C13 at both ends, and the capacitor C13 is connected with a resistor R21 and a resistor R21A in parallel.

[0011] The output ends of the driver are connected with a capacitor EC5 and a capacitor EC6 in parallel.

[0012] The driver is connected with a MOS tube Q3, the source of the MOS tube Q3 is connected with the secondary of the transformer T, the drain of the MOS tube Q3 is connected with the output end, the source of the MOS tube Q3 is connected with the secondary of the transformer T, and the source and the drain of the MOS tube Q3 are connected with a resistor R16 and a capacitor C10.

[0013] Compared with the prior art, the utility model has the following beneficial technical effects:

[0014] Reduce the power consumption in rectification process, improve the whole efficiency, utilize gallium nitride's MOS tube, have higher switching speed and lower on resistance, thereby reduce the switching loss and on resistance loss, pass through the feedback of optical coupler, ensure the voltage and current accurate regulation of output. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the circuit principle schematic drawing of the utility model;

[0016] Figure 2 It is the connection principle schematic drawing of rectifier module in the utility model;

[0017] Figure 3 This is a schematic diagram illustrating the connection principle of the main controller in this utility model;

[0018] Figure 4 This is a schematic diagram illustrating the connection principle of the driver in this utility model. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, it should be understood that if terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0022] like Figures 1-4As shown, a control circuit for a gallium nitride (GaN) charger includes an electromagnetic suppression module, a rectifier module, a filter module, a main controller U1, a driver, a primary optocoupler module, a secondary optocoupler module, and a transformer T. The electromagnetic suppression module is connected to the rectifier module, the rectifier module is connected to the filter module, and the filter module is connected to the main controller. The main controller is located on the primary side of the transformer T. The primary optocoupler module is located on the secondary side of the transformer T and connected to the main controller. The main controller is connected to a switching circuit module, which is connected to the primary side of the transformer T. The secondary optocoupler module is located on the secondary side of the transformer T and connected to the driver. The driver is connected to the secondary side of the transformer T and has an output terminal. The main controller U1 is mainly a PWM control chip.

[0023] The electromagnetic interference suppression module includes a filter inductor LF1, a filter inductor LF2, a capacitor CY1, a capacitor CY2, and a capacitor CX1. Capacitors CY1 and CY2 are connected in series and then connected to both sides of the filter inductor LF1. The filter inductor LF1 is connected to the filter inductor LF2 through the capacitor CX1. Diodes D1 and D2 are connected to the two ends of the filter inductor LF2. The filter inductor LF2 is connected to the rectifier module and has good electromagnetic interference suppression capability. By utilizing the filter inductors and the cooperation of each capacitor, the electromagnetic interference performance at the input end is further optimized.

[0024] The primary feedback module is an optocoupler U2B, which is connected to the main controller via resistor R10. The main controller is connected to transistor Q2. The base of transistor Q2 is grounded through Zener diode Z1. The collector of transistor Q2 is connected to the primary winding of transformer T via diode D4 and inductor L1. Resistor R6 and capacitor C5 are connected across diode D4. Diode D5 is connected to the emitter of transistor Q2 via diode D5, which is connected to capacitor EC4 and capacitor C6 and grounded. Diode D4 is connected to inductor L1, which is connected to the main controller via resistor R9. Resistor R7 is connected between the collector and base of transistor Q2.

[0025] The main controller is responsible for controlling the on and off of MOSFET Q2 and regulating the energy transfer of transformer T1.

[0026] The switching circuit module includes a MOSFET Q1. The gate of MOSFET Q1 is connected to the main controller through a resistor R11. Resistor R11 is connected to resistor R12. Resistor R12 is connected to diode D6. Diode D6 is connected to capacitor C3 and the gate of MOSFET Q1. The drain of MOSFET Q1 is connected to diode D3. Diode D3 is connected to resistors R5 and R5A in parallel. Resistors R5 and R5A in parallel are connected to capacitor C2 and then connected to the primary winding of transformer T. The rectifier module and filter module are connected and then connected to the primary winding of transformer T. The source of MOSFET Q1 is grounded and connected to the gate through a resistor R13.

[0027] Diodes D1 and D2 are connected in series with resistors R1, R2 and RJ1, and then connected to the main controller.

[0028] The secondary optocoupler module includes optocoupler U2A, which is connected to the driver via resistors R19 and R17. Optocoupler U2A is connected to capacitor C14, which is connected to resistor R22. Resistor R23 and capacitor C13 are connected across capacitor C14. Capacitor C13 is connected to resistors R21 and R21A in parallel. Optocoupler U2A is used to transmit power to the primary PWM control chip, achieving stable output voltage and current.

[0029] A parallel capacitor EC5 and a capacitor EC6 are connected between the output terminals of the driver. The driver is connected to MOSFET Q3, and a capacitor C11 is connected to the driver. The source of MOSFET Q3 is connected to the secondary winding of transformer T, the drain of MOSFET Q3 is connected to the output terminal, and the source of MOSFET Q3 is connected to the secondary winding of transformer T. A resistor R16 and a capacitor C10 are connected between the source and drain of MOSFET Q3. Resistor R16 can be used to collect current, monitor the output current, control the duty cycle of the PWM signal, and dynamically adjust the output voltage and current.

[0030] Transformer T1 acts as an energy transfer element. On its primary side, a pulsed voltage generated by a high-frequency switch transfers energy to the secondary side via electromagnetic induction. The MOSFET Q3 on the secondary side of transformer T1 reduces rectification losses. Capacitors EC5 and EC6 at the output smooth the rectified pulsating voltage into a stable DC output. Two optocouplers not only provide electrical isolation between the primary and secondary circuits but also handle feedback information transmission.

[0031] It should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A control circuit for a gallium nitride charger, characterized in that, It includes an electromagnetic suppression module, a rectifier module, a filter module, a main controller, a driver, a primary optocoupler module, a secondary optocoupler module, and a transformer T. The electromagnetic suppression module is connected to the rectifier module, the rectifier module is connected to the filter module, the filter module is connected to the main controller, the main controller is located on the primary side of the transformer T, the primary optocoupler module is located on the secondary side of the transformer T and connected to the main controller, the main controller is connected to a switching circuit module, the switching circuit module is connected to the primary side of the transformer T, the secondary optocoupler module is located on the secondary side of the transformer T and connected to the driver, the driver is connected to the secondary side of the transformer T, and the driver has an output terminal.

2. The control circuit of the gallium nitride charger according to claim 1, characterized in that, The electromagnetic suppression module includes a filter inductor LF1, a filter inductor LF2, a capacitor CY1, a capacitor CY2, and a capacitor CX1. Capacitors CY1 and CY2 are connected in series and then connected to both sides of the filter inductor LF1. The filter inductor LF1 is connected to the filter inductor LF2 through the capacitor CX1. Diodes D1 and D2 are connected to the two ends of the filter inductor LF2. The filter inductor LF2 is connected to the rectifier module.

3. The control circuit of the gallium nitride charger according to claim 2, characterized in that, The primary feedback module is an optocoupler U2B, which is connected to the main controller through a resistor R10. The main controller is connected to a transistor Q2. The base of transistor Q2 is grounded through a Zener diode Z1. The collector of transistor Q2 is connected to the primary winding of transformer T through a diode D4 and an inductor L1. A resistor R6 and a capacitor C5 are connected across the two ends of diode D4.

4. The control circuit of the gallium nitride charger according to claim 3, characterized in that, The switching circuit module includes a MOSFET Q1. The gate of MOSFET Q1 is connected to the main controller through a resistor R11. Resistor R11 is connected to resistor R12. Resistor R12 is connected to diode D6. Diode D6 is connected to capacitor C3 and the gate of MOSFET Q1. The drain of MOSFET Q1 is connected to diode D3. Diode D3 is connected to resistors R5 and R5A in parallel. Resistors R5 and R5A in parallel are connected to capacitor C2 and then connected to the primary winding of transformer T. The rectifier module and filter module are connected and then connected to the primary winding of transformer T. The source of MOSFET Q1 is grounded and connected to the gate through a resistor R13.

5. The control circuit of the gallium nitride charger according to claim 4, characterized in that, The secondary optocoupler module includes optocoupler U2A, which is connected to the driver through resistors R19 and R17. Optocoupler U2A is connected to capacitor C14, which is connected to resistor R22. Resistor R23 and capacitor C13 are connected to both ends of capacitor C14. Capacitor C13 is connected to resistors R21 and R21A in parallel.

6. The control circuit of the gallium nitride charger according to claim 5, characterized in that, The output terminals of the driver are connected in parallel with capacitors EC5 and EC6.

7. The control circuit of the gallium nitride charger according to claim 6, characterized in that, The driver is connected to MOSFET Q3. The source of MOSFET Q3 is connected to the secondary winding of transformer T. The drain of MOSFET Q3 is connected to the output terminal. The source of MOSFET Q3 is connected to the secondary winding of transformer T. A resistor R16 and a capacitor C10 are connected between the source and drain of MOSFET Q3.

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