High-voltage direct-current converter in portable mobile power supply

Abstract

The utility model discloses a high-voltage DC converter in a portable mobile power supply. Comprising a processing chip U1, a first capacitor C1, a second capacitor C2, fourth to seventeenth capacitors C4-C17, a twenty-first capacitor C21, a twenty-third capacitor C23, a twenty-fourth capacitor C24, a first inductor L1, a second inductor L2, first to fourth resistors R1-R4, sixth to eighth resistors R6-R8, tenth to twenty-second resistors R10-R22, a twenty-fourth resistor R24, a thirty-fifth resistor R35, a first triode Q1 and a second triode Q2. The system comprises a first light emitting diode LED1, first to third diodes D1 to D3, a fifth diode D5, a first electrolytic capacitor EC1 and a second electrolytic capacitor EC2, a synchronous rectification control chip MK9218 is adopted as the core of the direct current converter, two SGT type deep groove high-voltage low-resistance MOSFETs are adopted as power devices, the driving frequency is set to be 200 Khz, and a forced PWM mode and a simulation diode mode are adopted as the control mode. The utility model has the advantages of simple structure, high working frequency, small occupied space of a power device, high light-load and full-load efficiency, small output voltage ripple and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to mobile power supply technical field especially, it relates to a high voltage direct current converter in portable mobile power supply. BACKGROUND

[0002] Now small power (300W / 600W / 800W) portable mobile power supply more adopts 12V or 24V power supply system, mainly by battery pack, inverter, BMS, main control board, shell constitute. Among them, the main control board is used to control the opening or closing of various functions, illumination, display state information, and the battery pack power conversion into external device available DC power, AC power etc.

[0003] Small power portable mobile power supply power is small, function is few, working time is short, cannot satisfy the long time power demand under the current outing, power failure situation, in this case, the demand of high voltage high power mobile power supply is urgent, battery voltage 48V, system power in 1KW~3KW power supply system also arises at the historic moment, and 12V and 24V power supply system's DC converter cannot satisfy this kind of high voltage power supply system, so need to redesign the DC converter that satisfies 48V power supply system. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of high voltage direct current converter in portable mobile power supply, to solve the problem that small power portable mobile power supply power is small in prior art, function is few, working time is short, cannot satisfy the long time power demand under the current outing, power failure situation.

[0005] The utility model provides a kind of high voltage direct current converter in portable mobile power supply, including processing chip U1, first capacitor C1, second capacitor C2, fourth to seventeenth capacitor C4~C17, twenty-first capacitor C21, twenty-third capacitor C23, twenty-fourth capacitor C24, first inductance L1, second inductance L2, first to fourth resistance R1~R4, sixth to eighth resistance R6~R8, tenth to twenty-second resistance R10~R22, twenty-fourth resistance R24, third thirty-fifth resistance R35, first triode Q1, second triode Q2, first light emitting diode LED1, first to third diode D1~D3, fifth diode D5, first electrolytic capacitor EC1 and second electrolytic capacitor EC2;

[0006] One end of the seventh capacitor C7, the eighth capacitor C8 and the ninth capacitor C9 is connected to an external high voltage, and the other end is connected to ground; one end of the thirty-fifth resistor R35 and the first inductor L1 is connected to an external high voltage, and the other end is connected to the input end of the first electrolytic capacitor EC1; the other end of the first electrolytic capacitor EC1 is connected to ground; one end of the first capacitor C1, the second capacitor C2, the fourth capacitor C4, the fifth capacitor C5 and the sixth capacitor C6 is connected to the input end of the first electrolytic capacitor EC1, and the other end is connected to ground;

[0007] One end of the tenth capacitor C10 is connected to ground, and the other end is connected to the VIN end of the processing chip U1; one end of the fourth resistor R4 is connected to the input end of the first electrolytic capacitor EC1, and the other end is connected to the VIN end of the processing chip U1;

[0008] One end of the second resistor R2 is connected to ground, and the other end is connected to one end of the third resistor R3; the other end of the third resistor R3 is connected to the EN end of the processing chip U1; one end of the first resistor R1 is connected to DC-VIN, and the other end is connected to the EN end of the processing chip U1;

[0009] One end of the sixth resistor R6 and the eleventh capacitor C11 is connected to one end of the third resistor R3; the other end of the sixth resistor R6 is connected to the RT end of the processing chip U1, and the other end of the eleventh capacitor C11 is connected to the SS / TRK end of the processing chip U1;

[0010] The thirteenth resistor R13 and the fifteenth capacitor C15 are connected in series, and then connected in parallel with the twelfth resistor R12; one end is connected to the FB end of the processing chip U1, and the other end is connected to one end of the tenth resistor R10; the other end of the tenth resistor R10 is connected to an external 12V voltage; the eighth resistor R8 and the twelfth capacitor C12 are connected in series, and then connected in parallel with the fourteenth capacitor C14; one end is connected to the FB end of the processing chip U1, and the other end is connected to the COMP end of the processing chip U1; one end of the seventeenth resistor R17 is connected to the FB end of the processing chip U1, and the other end is connected to ground, the AGND and NC ends of the processing chip U1;

[0011] The twentieth resistor R20, the twenty-second resistor R22 and the light emitting diode LED1 are connected in series; the input end is connected to the SYNCI end of the processing chip U1, and the output end is connected to the PG end of the processing chip U1;

[0012] One end of the fourth resistor R4 is connected to the input end of the first electrolytic capacitor EC1, and the other end is connected to the VIN end of the processing chip U1;

[0013] The first diode D1 and the seventh resistor R7 are connected in parallel, and the output end is connected with the HO end of the processing chip U1, the input end is connected with one end of the first transistor Q1 and the eleventh resistor R11, the other two ends of the first transistor Q1 are connected with the input end of the first electrolytic capacitor EC1 and the SW end of the processing chip U1 respectively; one end of the thirteenth resistor R13 is connected with the BST end of the processing chip U1, the other end is connected with the SW end of the processing chip U1, the other end of the eleventh resistor R11 is connected with the SW end of the processing chip U1; one end of the second inductor L2 is connected with the SW end of the processing chip U1, the other end is connected with external 12V high voltage; one end of the twenty-first resistor R21 and the thirteenth capacitor C23 is connected with the ILIM end of the processing chip U1, the other end of the twenty-first resistor R21 is connected with the SW end of the processing chip U1, the other end of the thirteenth capacitor C23 is connected with the ground; one end of the twenty-fourth capacitor C24 is connected with the VCC end of the processing chip U1, the other end is connected with the ground; the input end of the fifth diode D5 is connected with external 12V high voltage, the output end is connected with the VCC end of the processing chip U1;

[0014] One end of the fourteenth resistor R14 is connected with the LO end of the processing chip U1, the other end is connected with one end of the fifteenth resistor R15, the other end of the fifteenth resistor R15 is connected with one end of the second transistor Q2 and the eighteenth resistor R18, the other end of the eighteenth resistor R18 is connected with the ground, the other two ends of the second transistor Q2 are connected with the SW end of the processing chip U1 and the ground respectively; the output end and the input end of the second diode D2 are connected with one end and the other end of the fifteenth resistor R15 respectively; the input end of the third diode D3 is connected with the ground, the output end is connected with the SW end of the processing chip U1, one end of the second inductor L2 is connected with the SW end of the processing chip U1, the other end is connected with external 12V high voltage; the sixteenth resistor R16 and the sixteenth capacitor C16 are connected in series, one end is connected with the SW end of the processing chip U1, the other end is connected with the ground; the second electrolytic capacitor EC2, the seventeenth capacitor C17 and the twenty-first capacitor C21 are connected in parallel, the input end is connected with external 12 high voltage, the other end is connected with the ground and one end of the nineteenth resistor R19, the other end of the nineteenth resistor R19 is connected with the ground.

[0015] The high-voltage direct-current converter in the portable power supply has the following advantages:

[0016] The direct-current converter core adopts a synchronous rectification control chip MK9218, power devices adopt two SGT type deep-groove high-voltage low-resistance MOSFETs, the driving frequency is set to 200Khz, and the control mode adopts a forced PWM mode and an imitation diode mode. The high-voltage direct-current converter has the advantages of high working frequency, small power device space occupation, high light-load and full-load efficiency, small output voltage ripple and the like.

[0017] This solution can meet the needs of 48V power systems, while also being compatible with 12V and 24V power systems. It offers rich configurability and can be combined with various peripheral circuits to achieve different functional requirements. The control method is simple, with strong expandability and excellent functionality. Furthermore, it features a wide input voltage range, customizable switching frequency, high conversion efficiency, low losses under no-load and light-load conditions, comprehensive protection functions, a small number of components, strong compatibility, and can be used in most DC-DC buck conversion scenarios. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 The diagram shown is a schematic diagram of the circuit structure of the high-voltage DC converter in the portable power supply of this utility model.

[0020] Figure 2 The output and input voltage waveforms are shown in this utility model.

[0021] Figure 3 The waveform shown is the gate drive waveform of the lower bridge arm MOSFET in this invention.

[0022] Figure 4 The waveform shown is the gate drive waveform of the upper bridge arm MOSFET in this utility model. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] like Figures 1 to 4 As shown, Figure 1 The diagram shown is a schematic diagram of the circuit structure of the high-voltage DC converter in the portable power supply of this utility model. Figure 2 The output and input voltage waveforms are shown in this utility model. Figure 3 The waveform shown is the gate drive waveform of the lower bridge arm MOSFET in this invention. Figure 4The utility model discloses a bridge arm MOSFET gate drive waveform in the utility model. The utility model provides a kind of high voltage direct current converter in portable power bank, including processing chip U1, first capacitor C1, second capacitor C2, fourth to seventeenth capacitor C4~C17, twenty-first capacitor C21, twenty-third capacitor C23, twenty-fourth capacitor C24, first inductor L1, second inductor L2, first to fourth resistance R1~R4, sixth to eighth resistance R6~R8, tenth to twenty-second resistance R10~R22, twenty-fourth resistance R24, thirty-fifth resistance R35, first triode Q1, second triode Q2, first light emitting diode LED1, first to third diode D1~D3, fifth diode D5, first electrolytic capacitor EC1 and second electrolytic capacitor EC2;Direct current converter core uses synchronous rectification control chip MK9218, power device uses two SGT type deep-groove high-voltage low-resistance MOSFET, and driving frequency is set at 200Khz, and control mode uses forced PWM mode and simulation diode mode.Working frequency is high, and power device occupies small space, and light load and full load efficiency are high, and output voltage ripple is small and the like advantages.Processing chip U1's 1st pin enables end, 2nd pin is frequency setting end, 3rd pin is soft start end, 4th pin is compensation end, 5th pin is voltage feedback end, 6th pin is chip analog ground, 7th pin is synchronous output end, 8th pin is synchronous input end, 9th, 15th, 16th pin is empty pin, 10th pin is power state monitoring end, 11th pin is output current limit end, 12th pin is chip power ground, 13th pin is low-side MOSFET drive end, 14th pin is chip VCC output end, 17th pin is bootstrap capacitor charging end, 18th pin is high-side MOSFET drive end, 19th pin is switch node, 20th pin is high-voltage input end.When chip 1st pin EN enables end is lower than typical value, chip is in shutdown mode, internal bias power supply and driver are all closed, for shutdown mode.When chip 1st pin EN enables end is higher than typical value and lower than opening threshold value, internal bias power supply is opened, but switch driver and output end remain closed, for standby mode.When chip 14th pin VCC end is higher than undervoltage lockout typical value 5V, and 1st pin EN end is higher than opening threshold value, chip is in working mode.When chip is in working mode, and 8th pin synchronous input end is suspended or grounded, chip enters simulation diode mode, which is conducive to reducing power consumption under no-load and light load, for simulation diode mode.The seventh capacitor C7, the eighth capacitor C8 and the ninth capacitor C9 are connected in parallel, one end is connected to external high voltage, and the other end is connected to ground;The thirty-fifth resistance R35 and the first inductor L1 are connected in parallel, one end is connected to external high voltage, and the other end is connected to the input end of the first electrolytic capacitor EC1;The other end of the first electrolytic capacitor EC1 is connected to ground;One end of the first capacitor C1, the second capacitor C2, the fourth capacitor C4, the fifth capacitor C5 and the sixth capacitor C6 in parallel is connected to the input end of the first electrolytic capacitor EC1, and the other end is connected to the ground; one end of the tenth capacitor C10 is connected to the ground, and the other end is connected to the VIN end of the processing chip U1; one end of the fourth resistor R4 is connected to the input end of the first electrolytic capacitor EC1, and the other end is connected to the VIN end of the processing chip U1; one end of the second resistor R2 is connected to the ground, and the other end is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the EN end of the processing chip U1; one end of the first resistor R1 is connected to the DC-VIN end, and the other end is connected to the EN end of the processing chip U1; one end of the sixth resistor R6 and the eleventh capacitor C11 is connected to one end of the third resistor R3, the other end of the sixth resistor R6 is connected to the RT end of the processing chip U1, and the other end of the eleventh capacitor C11 is connected to the SS / TRK end of the processing chip U1; the thirteenth resistor R13 and the fifteenth capacitor C15 are connected in series, and then connected in parallel with the twelfth resistor R12, one end of which is connected to the FB end of the processing chip U1, and the other end is connected to one end of the tenth resistor R10, and the other end of the tenth resistor R10 is connected to an external 12V voltage; the eighth resistor R8 and the twelfth capacitor C12 are connected in series, and then connected in parallel with the fourteenth capacitor C14, one end of which is connected to the FB end of the processing chip U1, and the other end is connected to the COMP end of the processing chip U1; one end of the seventeenth resistor R17 is connected to the FB end of the processing chip U1, and the other end is connected to the ground, the AGND and the NC end of the processing chip U1; the twentieth resistor R20, the twenty-second resistor R22 and the light emitting diode LED1 are connected in series, the input end is connected to the SYNCI end of the processing chip U1, and the output end is connected to the PG end of the processing chip U1; one end of the fourth resistor R4 is connected to the input end of the first electrolytic capacitor EC1, and the other end is connected to the VIN end of the processing chip U1; the first diode D1 and the seventh resistor R7 are connected in parallel, the output end is connected to the HO end of the processing chip U1, the input end is connected to one end of the first transistor Q1 and the eleventh resistor R11, the other two ends of the first transistor Q1 are respectively connected to the input end of the first electrolytic capacitor EC1 and the SW end of the processing chip U1; one end of the thirteenth resistor R13 is connected to the BST end of the processing chip U1, and the other end is connected to the SW end of the processing chip U1, and the other end of the eleventh resistor R11 is connected to the SW end of the processing chip U1; one end of the second inductor L2 is connected to the SW end of the processing chip U1, and the other end is connected to an external 12V high voltage; one end of the twenty-first resistor R21 and the twenty-third capacitor C23 is connected to the ILIM end of the processing chip U1, the other end of the twenty-first resistor R21 is connected to the SW end of the processing chip U1, and the other end of the twenty-third capacitor C23 is connected to the ground;One end of the twenty-fourth capacitor C24 is connected to the VCC end of the processing chip U1, and the other end is connected to the ground; the input end of the fifth diode D5 is connected to an external 12V high voltage, and the output end is connected to the VCC end of the processing chip U1; one end of the fourteenth resistor R14 is connected to the LO end of the processing chip U1, and the other end is connected to one end of the fifteenth resistor R15, and the other end of the fifteenth resistor R15 is connected to one end of the second triode Q2 and the eighteenth resistor R18, and the other end of the eighteenth resistor R18 is connected to the ground, and the other two ends of the second triode Q2 are respectively connected to the SW end of the processing chip U1 and the ground; the input end and the output end of the second diode D2 are respectively connected to one end and the other end of the fifteenth resistor R15; the input end of the third diode D3 is connected to the ground, and the output end is connected to the SW end of the processing chip U1, and one end of the second inductor L2 is connected to the SW end of the processing chip U1, and the other end is connected to an external 12V high voltage; the sixteenth resistor R16 and the sixteenth capacitor C16 are connected in series, one end is connected to the SW end of the processing chip U1, and the other end is connected to the ground; the input end of the second electrolytic capacitor EC2, the seventeenth capacitor C17 and the twenty-first capacitor C21 are connected in parallel, and the other end is connected to the ground and one end of the nineteenth resistor R19, and the other end of the nineteenth resistor R19 is connected to the ground. When the enable end EN of the synchronous rectification control chip is at a high level, the internal LDO of the chip starts to work, the low-side driver is opened, the BST bootstrap capacitor starts to charge, after 3 working periods, the high-side driver is opened, the low-side driver is closed, and the high-low side driver starts to control the conduction and cut-off of the upper and lower bridge arm MOSFET, so as to control the charging and discharging of the power inductor, form a power loop, the output end is stabilized through the energy storage and filter capacitor, and then the voltage information is transmitted to the chip FB end through the resistance division, and the chip adjusts the duty cycle of the high-low side driver through voltage feedback, so that the output end voltage is stable.

[0025] The high-voltage direct-current converter in the portable power supply has the advantages that the core of the direct-current converter adopts a synchronous rectification control chip MK9218, power devices adopt two SGT type deep-groove high-voltage low-resistance MOSFETs, the driving frequency is set to 200Khz, and the control mode adopts a forced PWM mode and an imitation diode mode. The working frequency is high, the power devices occupy small space, the light load and full load efficiency is high, the output voltage ripple is small, and the like. The 48V power supply system can be met, meanwhile, the 12V and 24V power supply systems can be compatible, the configurable function is rich, various peripheral circuits can be matched to realize different functional requirements, the control mode is simple, the expandability is strong, and the functionality is excellent. The input voltage range is wide, the switching frequency can be set automatically, the conversion efficiency is high, the loss is small under no-load and light load, various protection functions are perfect, the number of used components is small, the compatibility is strong, and the portable power supply can be used in most direct-current step-down conversion scenes.

[0026] The above merely describes a preferred embodiment of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A high voltage DC converter in a portable mobile power supply, characterized by The first capacitor C1, the second capacitor C2, the fourth to seventeenth capacitors C4-C17, the twenty-first capacitor C21, the twenty-third capacitor C23, the twenty-fourth capacitor C24, the first inductor L1, the second inductor L2, the first to fourth resistors R1-R4, the sixth to eighth resistors R6-R8, the tenth to twenty-second resistors R10-R22, the twenty-fourth resistor R24, the thirty-fifth resistor R35, the first transistor Q1, the second transistor Q2, the first light-emitting diode LED1, the first to third diodes D1-D3, the fifth diode D5, the first electrolytic capacitor EC1, and the second electrolytic capacitor EC2 are included. One end of the seventh capacitor C7, the eighth capacitor C8, and the ninth capacitor C9 is connected to an external high voltage, and the other end is connected to ground. One end of the thirty-fifth resistor R35 and the first inductor L1 is connected to an external high voltage, and the other end is connected to the input end of the first electrolytic capacitor EC1. The other end of the first electrolytic capacitor EC1 is connected to ground. One end of the first capacitor C1, the second capacitor C2, the fourth capacitor C4, the fifth capacitor C5, and the sixth capacitor C6 is connected to the input end of the first electrolytic capacitor EC1, and the other end is connected to ground. One end of the tenth capacitor C10 is connected to ground, and the other end is connected to the VIN end of the processing chip U1. One end of the fourth resistor R4 is connected to the input end of the first electrolytic capacitor EC1, and the other end is connected to the VIN end of the processing chip U1. One end of the second resistor R2 is connected to ground, and the other end is connected to one end of the third resistor R3. The other end of the third resistor R3 is connected to the EN end of the processing chip U1. One end of the first resistor R1 is connected to DC-VIN, and the other end is connected to the EN end of the processing chip U1. One end of the sixth resistor R6 and the eleventh capacitor C11 is connected to one end of the third resistor R3. The other end of the sixth resistor R6 is connected to the RT end of the processing chip U1, and the other end of the eleventh capacitor C11 is connected to the SS / TRK end of the processing chip U1. The thirteenth resistor R13 and the fifteenth capacitor C15 are connected in series and then connected in parallel with the twelfth resistor R12. One end is connected to the FB end of the processing chip U1, and the other end is connected to one end of the tenth resistor R10. The other end of the tenth resistor R10 is connected to an external 12V voltage. The eighth resistor R8 and the twelfth capacitor C12 are connected in series and then connected in parallel with the fourteenth capacitor C14. One end is connected to the FB end of the processing chip U1, and the other end is connected to the COMP end of the processing chip U1. One end of the seventeenth resistor R17 is connected to the FB end of the processing chip U1, and the other end is connected to ground, the AGND end, and the NC end of the processing chip U1. The twentieth resistor R20, the twenty-second resistor R22, and the light-emitting diode LED1 are connected in series. The input end is connected to the SYNCI end of the processing chip U1, and the output end is connected to the PG end of the processing chip U1. One end of the fourth resistor R4 is connected to the input end of the first electrolytic capacitor EC1, and the other end is connected to the VIN end of the processing chip U1; The output end of the parallel connection of the first diode D1 and the seventh resistor R7 is connected to the HO end of the processing chip U1, the input end is connected to one end of the first transistor Q1 and the eleventh resistor R11, the other two ends of the first transistor Q1 are connected to the input end of the first electrolytic capacitor EC1 and the SW end of the processing chip U1 respectively; one end of the thirteenth resistor R13 is connected to the BST end of the processing chip U1, and the other end is connected to the SW end of the processing chip U1, the other end of the eleventh resistor R11 is connected to the SW end of the processing chip U1; one end of the second inductor L2 is connected to the SW end of the processing chip U1, and the other end is connected to an external 12V high voltage; one end of the twenty-first resistor R21 and the twenty-third capacitor C23 is connected to the ILIM end of the processing chip U1, the other end of the twenty-first resistor R21 is connected to the SW end of the processing chip U1, and the other end of the twenty-third capacitor C23 is connected to ground; one end of the twenty-fourth capacitor C24 is connected to the VCC end of the processing chip U1, and the other end is connected to ground; the input end of the fifth diode D5 is connected to an external 12V high voltage, and the output end is connected to the VCC end of the processing chip U1; One end of the fourteenth resistor R14 is connected to the LO end of the processing chip U1, and the other end is connected to one end of the fifteenth resistor R15, the other end of the fifteenth resistor R15 is connected to one end of the second transistor Q2 and the eighteenth resistor R18, the other end of the eighteenth resistor R18 is connected to ground, and the other two ends of the second transistor Q2 are connected to the SW end of the processing chip U1 and ground respectively; the input end and the output end of the second diode D2 are connected to one end and the other end of the fifteenth resistor R15 respectively; the input end of the third diode D3 is connected to ground, and the output end is connected to the SW end of the processing chip U1, one end of the second inductor L2 is connected to the SW end of the processing chip U1, and the other end is connected to an external 12V high voltage; one end of the series connection of the sixteenth resistor R16 and the sixteenth capacitor C16 is connected to the SW end of the processing chip U1, and the other end is connected to ground; the input end of the parallel connection of the second electrolytic capacitor EC2, the seventeenth capacitor C17 and the twenty-first capacitor C21 is connected to an external 12V high voltage, and the other end is connected to ground and one end of the nineteenth resistor R19, and the other end of the nineteenth resistor R19 is connected to ground.

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