Low-voltage power supply power adapter booster circuit and microcomputer power supply adapter device

Abstract

The utility model relates to a low-voltage power supply power adapter booster circuit and a microcomputer power supply adapter device, which are used for boosting the voltage of an adapter to adapt to a PC (Personal Computer) stack, and comprise a switching power supply chip, a front-end filter circuit, a rear-end filter circuit, a Schottky diode and an inductor, one end of the front-end filter circuit is used for being connected with an adapter, the other end of the front-end filter circuit is connected to the first end of the inductor L1, the first end of the inductor L1 is connected to a voltage input pin VIN of the power supply chip, and the second end of the inductor L1 is connected to a pin LX of the power supply chip and the positive electrode of the Schottky diode. The Schottky diode is connected to the rear-end filter circuit and is grounded through the two resistors connected in series, the whole circuit is connected to a chip to be powered through the rear-end filter circuit, the low-voltage output of the adapter is boosted to reach the voltage required by a microcomputer chip through the booster circuit, the circuit structure is simple and effective, the cost is reduced, and the power supply efficiency is improved. The problem that a user is prone to power failure due to insufficient voltage for a long time is solved, and product competitiveness is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of current and voltage detection, and in particular to a low-voltage power supply power adapter boost circuit and a microcomputer power adapter device. Background Art

[0002] Most microcomputers on the market usually use 12V or 19V power input solutions. This power supply method can provide sufficient power support to the device when the current is sufficient to ensure that the device is in a stable working state.

[0003] In a microcomputer, such as the model PC DONGLE mini computer, also known as PC Stick, sometimes also called computer stick or pocket computer, a 5V power input solution is adopted to meet the needs of customers in 5V low-voltage power scenarios. On the X86 platform, low power consumption is applied to 5V low-voltage input scenarios. There is a problem that when the computer USB interface is connected to the peripheral device and the load is too large, the 5V voltage is usually pulled down to below 4.5V, and the input range of Vsy of the power chip is 5~23V, which does not meet the minimum voltage input requirement of the computer power chip, which will cause the computer to directly power off or a certain functional module to fail. Utility Model Content

[0004] In view of this, a low-voltage power supply adapter boost circuit with a simplified circuit structure, good efficiency and low cost is provided to ensure that the computer obtains sufficient power support and avoid the problem that the input voltage is pulled down when the device is loaded due to the voltage margin being too low, thereby causing the device to power off and freeze.

[0005] A low-voltage power supply power adapter boost circuit, which is used to boost the voltage of the adapter to adapt to a PCstick, includes a power chip U1, a front-end filter circuit, a back-end filter circuit, a Schottky diode D1, and an inductor L1. The chip U1 is a DC-DC switching power chip. One end of the front-end filter circuit is used to connect the adapter and the other end is connected to the first end of the inductor L1. The first end of the inductor L1 is connected to the voltage input pin VIN of the power chip U1, and the second end is connected to the pin LX of the power chip U1 and the positive electrode of the Schottky diode D1. The negative electrode of the Schottky diode D1 is connected to the back-end filter circuit and grounded through two series resistors R1 and R2. The middle point of the two resistors R1 and R2 is connected to the pin FB of the power chip U1. The entire circuit is connected to a chip to be powered through the back-end filter circuit. The resistance ratio of the two resistors R1 and R2 is a predetermined ratio to boost the output voltage of the entire circuit and reach the voltage threshold required by the chip to be powered.

[0006] Furthermore, the front-end filter circuit is connected to a 5V power supply and the access end is further connected to the pin VBUS4 of the USB interface of the adapter.

[0007] Furthermore, the front-end filtering circuit includes three front filter capacitors C1, C2, and C3, which are connected in parallel. The first ends of the front filter capacitors C1, C2, and C3 are connected in parallel to the 5V power supply input terminal and the first end of the inductor L1 and the voltage input pin VIN of the chip U1, and the second ends of the front filter capacitors C1, C2, and C3 are grounded.

[0008] Furthermore, the 5V power input terminal, the first terminal of the pre-filter capacitor and the first terminal of the inductor L1 are also connected to the pin EN of the chip U1.

[0009] Furthermore, the back-end filtering circuit includes three back-filtering capacitors C4, C5, and C6 for power supply output filtering. The three back-filtering capacitors C4, C5, and C6 are connected in parallel. The first ends of the three back-filtering capacitors C4, C5, and C6 connected in parallel are connected to the cathode of the Schottky diode D1 and the voltage pin Vsy of the chip to be powered, and the second ends of the back-filtering capacitors C4, C5, and C6 connected in parallel are grounded.

[0010] Furthermore, the first ends of the three post-filtering capacitors C4, C5, and C6 are also connected to the power input terminal V12IN.

[0011] Furthermore, the chip to be powered is an X86 power management chip U2, which is used to power the PC stick, and the adapter has a Type-C connector.

[0012] Furthermore, the chip U1 is a DC-DC switching power supply chip of the SDB628 model, and the output voltage Vout calculation formula of the chip U1 is: Vout=Vref*(1+R1 / R2), Vref=0.6V, R1 and R2 are the resistance values ​​of the two resistors R1 and R2, the output voltage Vout has a value range of 12-28V, and the maximum current is 2A.

[0013] Preferably, the pin LX is connected to the drain of the MOSFET switch inside the power chip U1, and the voltage of the pin LX can swing between GND and 28V.

[0014] And, a microcomputer power adapter device, which includes a USB connector, the microcomputer has a power management chip, the microcomputer power adapter device also includes the low-voltage power supply adapter boost circuit as described above, the boost circuit is connected between the USB connector and the power management chip.

[0015] The above-mentioned low-voltage power supply power adapter boost circuit and microcomputer power adapter device use a switching power supply chip, combined with Schottky diode D1 and inductor L1, to boost the adapter voltage 5V to 12V, and the 12V voltage is input to the X86 power module PMIC, thereby ensuring that the machine obtains sufficient power support and avoiding the problem of the input voltage being pulled down when the device is loaded due to the voltage margin being too low, thereby causing the device to power off and freeze. The entire circuit uses an inductor and a Schottky diode, two resistors and an appropriate filter capacitor to achieve the above functions, simplify the circuit structure, and achieve the boost effect through a small number of electronic components, which greatly reduces costs, solves the long-standing problem of insufficient voltage and easy power off for users, and improves product competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a low-voltage power supply adapter boost circuit provided by an embodiment of the utility model.

[0017] Figure 2 yes Figure 1 Schematic diagram of the circuit structure of the main functional areas of the boost circuit. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0019] See also Figure 1 and Figure 2, showing a low-voltage power supply adapter boost circuit provided by an embodiment of the utility model, which is used to boost the voltage of the adapter to adapt to the PC stick, and includes a power chip U1, a front-end filter circuit, a back-end filter circuit, a Schottky diode D1, and an inductor L1. The chip U1 is a DC-DC switching power chip. One end of the front-end filter circuit is used to connect the adapter and the other end is connected to the first end of the inductor L1. The first end of the inductor L1 is connected to the voltage input pin VIN of the power chip U1, and the second end is connected to the pin LX of the power chip U1 and the positive electrode of the Schottky diode D1. The negative electrode of the Schottky diode D1 is connected to the back-end filter circuit and grounded through two series resistors R1 and R2. The middle point of the two resistors R1 and R2 is connected to the pin FB of the power chip U1. The whole circuit is connected to the chip to be powered through the back-end filter circuit. The resistance ratio of the two resistors R1 and R2 is a predetermined ratio to boost the output voltage of the whole circuit and reach the voltage threshold required by the chip to be powered. The pin LX is connected to the drain of the MOSFET switch inside the power chip U1, and the voltage of the pin LX can swing between GND and 28V.

[0020] Furthermore, the front-end filter circuit is connected to a 5V power supply and the access end is further connected to the pin VBUS4 of the USB interface of the adapter. The 5V power supply is also the usual output power supply of the adapter. It is first filtered by the front-end filter circuit and then enters the Schottky diode D1 and the DC-DC switching power supply chip.

[0021] Further, the front-end filter circuit includes three front filter capacitors C1, C2, and C3, which are connected in parallel, and the first ends of the front filter capacitors C1, C2, and C3 are connected in parallel to the 5V power input terminal and the first end of the inductor L1 and the voltage input pin VIN of the chip U1, and the second ends of the front filter capacitors C1, C2, and C3 are grounded after being connected in parallel. Among them, the capacitance of the two front filter capacitors C1 and C2 is basically the same, and the capacitance of the front filter capacitor C3 is much smaller than that of the front filter capacitors C1 and C2. Further, the 5V power input terminal, the first ends of each front filter capacitor, and the first end of the inductor L1 are also connected to the pin EN of the chip U1. The 5V power input terminal can supply power to the DC-DC switching power supply chip and is connected to the pin EN at the same time. The pin EN is an enable pin, which is enabled at a high level and disabled at a low level.

[0022] Further, the back-end filtering circuit includes three back-filtering capacitors C4, C5, and C6 for power output filtering, and the three back-filtering capacitors C4, C5, and C6 are connected in parallel, and the first ends of the three back-filtering capacitors C4, C5, and C6 connected in parallel are connected to the cathode of the Schottky diode D1 and the voltage pin Vsy of the chip to be powered, and the second ends of the back-filtering capacitors C4, C5, and C6 connected in parallel are grounded. Further, the first ends of the three back-filtering capacitors C4, C5, and C6 are also connected to the power input terminal V12IN. Among them, the capacitance of the two back-filtering capacitors C4 and C5 is basically the same, and the capacitance of the front-filtering capacitor C6 is much smaller than that of the front-filtering capacitors C4 and C5.

[0023] Furthermore, the chip to be powered is an X86 power management chip U2, which is used to power the PC stick, and the adapter has a Type-C connector. The output voltage of the adapter is usually 5V. However, when using a 5V power input, the device peripheral load is too large, which directly pulls down the input voltage of Vsy. When it is pulled down to below 4.5V, it will cause the computer to power off directly or a certain functional module to fail. Therefore, the boost circuit of this embodiment pulls the output voltage of the adapter from 5V or below 5V to 12V or above.

[0024] Furthermore, the chip U1 is a DC-DC switching power supply chip of the SDB628 model, and the calculation formula of the output voltage Vout of the chip U1 is: Vout=Vref*(1+R1 / R2), Vref=0.6V, R1 and R2 are the resistance values ​​of the two resistors R1 and R2, and the numerical range of the output voltage Vout is 12-28V, and the maximum current is 2A. As shown in the figure, the resistance value of resistor R1 is 19KΩ, and the resistance value of resistor R2 is 1KΩ, so the output voltage is exactly 12V, and the input voltage range requirement of the chip Vsy of the microcomputer is 5~23V, which fully meets the input requirement. The middle point of the two resistors R1 and R2 is connected to the pin FB of the power chip U1, and the output voltage information is fed back through the pin FB, so that the chip can adjust the power supply and respond accordingly after receiving the feedback.

[0025] The embodiment of the utility model also provides a microcomputer power adapter device, which includes a USB connector and a low-voltage power supply adapter boost circuit as described above, the microcomputer has a power management chip, and the boost circuit is connected between the USB connector and the power management chip.

[0026] It can be seen that the above-mentioned low-voltage power supply power adapter boost circuit and microcomputer power adapter device, by using a switching power supply chip, combined with Schottky diode D1 and inductor L1, boosts the adapter voltage 5V to 12V, and the 12V voltage is input to the X86 power module PMIC, thereby ensuring that the machine obtains sufficient power support and avoiding the problem of the input voltage being pulled down when the device is loaded due to the voltage margin being too low, thereby causing the device to power off and freeze. The entire circuit uses an inductor and a Schottky diode, two resistors and an appropriate filter capacitor to achieve the above functions, simplifying the circuit structure, and achieving the boost effect through a small number of electronic components, greatly reducing costs, solving the long-standing problem of users being troubled by insufficient voltage and easy power off, and improving product competitiveness.

[0027] It should be noted that the present invention is not limited to the above-mentioned embodiments. According to the creative spirit of the present invention, those skilled in the art may also make other changes. These changes made according to the creative spirit of the present invention should be included in the scope of protection required by the present invention.

Claims

1. A low voltage power supply adapter boost circuit, which is used to boost the voltage of the adapter to adapt to the PC stick, characterized in that: It includes a power chip U1, a front-end filtering circuit, a back-end filtering circuit, a Schottky diode D1, and an inductor L1. The chip U1 is a DC-DC switching power chip. One end of the front-end filtering circuit is used to connect to an adapter and the other end is connected to the first end of the inductor L1. The first end of the inductor L1 is connected to the voltage input pin VIN of the power chip U1, and the second end is connected to the pin LX of the power chip U1 and the positive electrode of the Schottky diode D1. The negative electrode of the Schottky diode D1 is connected to the back-end filtering circuit and grounded through two series resistors R1 and R2. The middle point of the two resistors R1 and R2 is connected to the pin FB of the power chip U1. The entire circuit is connected to the chip to be powered through the back-end filtering circuit. The resistance ratio of the two resistors R1 and R2 is a predetermined ratio to increase the output voltage of the entire circuit and reach the voltage threshold required by the chip to be powered.

2. The low voltage power supply adapter boost circuit according to claim 1, characterized in that: The front-end filter circuit is connected to a 5V power supply and the access end is further connected to the pin VBUS4 of the USB interface of the adapter.

3. The low voltage power supply adapter boost circuit according to claim 1, characterized in that: The front-end filtering circuit includes three front filtering capacitors C1, C2, and C3, which are connected in parallel. The first ends of the front filtering capacitors C1, C2, and C3 are connected in parallel to the 5V power input terminal and the first end of the inductor L1 and the voltage input pin VIN of the chip U1, and the second ends of the front filtering capacitors C1, C2, and C3 are grounded.

4. The low voltage power supply adapter boost circuit according to claim 1, characterized in that: The 5V power input terminal, the first terminal of the pre-filter capacitor and the first terminal of the inductor L1 are also connected to the pin EN of the chip U1.

5. The low voltage power supply adapter boost circuit according to claim 1, characterized in that: The back-end filtering circuit includes three back-filtering capacitors C4, C5, and C6 for power supply output filtering. The three back-filtering capacitors C4, C5, and C6 are connected in parallel. The first ends of the three back-filtering capacitors C4, C5, and C6 connected in parallel are connected to the cathode of the Schottky diode D1 and the voltage pin Vsy of the chip to be powered, and the second ends of the back-filtering capacitors C4, C5, and C6 connected in parallel are grounded.

6. The low voltage power supply adapter boost circuit as claimed in claim 5, characterized in that: The first ends of the three post-filtering capacitors C4, C5 and C6 are also connected to the power input terminal V12IN.

7. The low voltage power supply adapter boost circuit according to claim 1, characterized in that: The chip to be powered is an X86 power management chip U2, which is used to power the PC stick, and the adapter has a Type-C connector.

8. The low voltage power supply adapter boost circuit according to claim 1, characterized in that: The chip U1 is a DC-DC switching power supply chip of the SDB628 model. The calculation formula of the output voltage Vout of the chip U1 is: Vout=Vref*(1+R1 / R2), Vref=0.6V, R1 and R2 are the resistance values ​​of the two resistors R1 and R2, the value range of the output voltage Vout is 12-28V, and the maximum current is 2A.

9. The low voltage power supply adapter boost circuit according to claim 1, characterized in that: The pin LX is connected to the drain of the MOSFET switch inside the power chip U1, and the voltage of the pin LX can swing between GND and 28V.

10. A microcomputer power adapter device, comprising a USB connector, wherein the microcomputer has a power management chip, characterized in that: The microcomputer power adapter device also includes a low-voltage power supply adapter boost circuit as described in any one of claims 1-9, and the boost circuit is connected between the USB connector and the power management chip.

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