Power management circuit of motor mainboard

Abstract

The utility model relates to a power supply management circuit of a motor mainboard, which comprises a power supply conversion circuit, a battery power supply control circuit and a button detection circuit, the power supply conversion circuit is connected with an input voltage VBAT, the battery power supply control circuit is connected with the input voltage VBAT, and the button detection circuit is connected with the battery power supply control circuit. The power conversion circuit is used for converting an input voltage VBAT into 3.3 V, the battery power supply control circuit is used for controlling on and off of battery power supply through a BATEN signal, and when the BATEN is at a high level, Q3 is conducted, the base voltage of Q4 is lowered and cut off, so that the enable end of the DC-DC converter is closed, and VBAT output is stopped; and the key detection circuit feeds back the key condition to the KEYWKUP through the SW1 key and outputs a high-level or low-level signal to judge the state of the key at the moment. According to the utility model, the input voltage VBAT can be efficiently and stably converted into 3.3 V through the power conversion circuit, so that the requirement of a motor mainboard on stable working voltage is met, and the stability of circuit operation is improved.

Description

Technical Field

[0001] This utility model relates to the field of power management technology for motor motherboards, and specifically to a power management circuit for a motor motherboard. Background Technology

[0002] Power management is crucial during the operation of the motor motherboard. Existing motor motherboard power management circuits have many problems, such as the inability to efficiently and stably convert the battery input voltage to a suitable operating voltage, insufficient precision and flexibility in battery power control, and imperfect button detection functions. As a result, in actual use, the motor motherboard may experience abnormal power supply, excessive power consumption, and untimely operation response, which seriously affects the performance and stability of the motor. Summary of the Invention

[0003] The purpose of this invention is to provide a power management circuit for a motor motherboard to solve the problems of unstable power conversion, inflexible battery power control, and inaccurate button detection in the prior art, thereby achieving efficient power management of the motor motherboard and improving the overall performance and stability of the motor.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A power management circuit for a motor motherboard, characterized in that it includes a power conversion circuit, a battery power supply control circuit, and a key detection circuit. The power conversion circuit is connected to the input voltage VBAT, the battery power supply control circuit is connected to the input voltage VBAT, and the key detection circuit is connected to the battery power supply control circuit. The power conversion circuit converts the input voltage VBAT to 3.3V. The battery power supply control circuit controls the on / off state of battery power supply via the BAT_EN signal. When BAT_EN is high, Q3 is turned on, pulling down the base voltage of Q4 to turn it off, thereby shutting down the enable terminal of the DC-DC converter and stopping the VBAT output. The key detection circuit uses the SW1 key to feed back the key press status to KEY_WKUP and outputs a high or low level signal to determine the current key press state.

[0006] The present invention further includes a power conversion circuit comprising a transistor Q2 connected to the input voltage VBAT, an inductor L1, a diode D2, and a resistor R32. The inductor L1 is connected to a boost converter Q1 and to pin 3 of the boost converter Q1. Pin 2 of the boost converter is connected to the resistor R32. The resistor R32 is also connected to a capacitor C14. Pin 1 of the boost converter is grounded. The transistor Q2 is connected to the capacitor C13. The resistor R32 is a zero-ohm resistor used for jumper connection.

[0007] The present invention further includes a battery power supply control circuit comprising resistors R14 and R15 connected to transistor Q2. Resistor R14 is connected to diode D4 and capacitor C48 in sequence and then grounded. One end of capacitor C48 is connected to a +5V voltage. Resistor R15 is connected to transistor Q4. The base of transistor Q4 is connected to resistor R17 and transistor Q3. The base of transistor Q3 is connected to resistor R18. Resistor R18 is connected to battery BAT-EN. A resistor R38 is provided between resistor R18 and the base of transistor Q3. Resistor R38 is connected to a 3.3V voltage. The emitter of transistor Q3 is connected to capacitor C49 and then grounded. A resistor R16 is connected between the base of transistor Q4 and resistor R17. The other end of resistor R16 is connected to the emitter of transistor Q4 and grounded.

[0008] In a further embodiment of this invention, the resistor R15 is connected to a key detection circuit, the key detection circuit includes a diode D1 connected to the resistor R15, the diode D1 is connected to a switch SW1, and a diode D4 and a resistor R19 are connected between the diode D1 and the switch SW1, with the resistor R19 connected to a 3.3V voltage.

[0009] The beneficial effects of this utility model are:

[0010] This invention can efficiently and stably convert the input voltage VBAT to 3.3V through a power conversion circuit, meeting the motor motherboard's requirement for a stable operating voltage and improving the stability of circuit operation.

[0011] The battery power supply control circuit can precisely control the on and off of battery power supply through the BAT_EN signal, realizing flexible management of battery power supply, effectively reducing power consumption and extending battery life.

[0012] The button detection circuit can accurately feed back the button press status to KEY_WKUP and output the corresponding level signal, enabling the motor mainboard to respond to button operations in a timely manner and improving the user experience. Attached Figure Description

[0013] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0014] Figure 1 This is a circuit diagram of an embodiment of the present invention. Detailed Implementation

[0015] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0016] like Figure 1 As shown, this utility model provides a power management circuit for a motor motherboard, including a power conversion circuit, a battery power supply control circuit, and a key detection circuit. The power conversion circuit is connected to the input voltage VBAT, the battery power supply control circuit is connected to the input voltage VBAT, and the key detection circuit is connected to the battery power supply control circuit. The power conversion circuit converts the input voltage VBAT to 3.3V. The battery power supply control circuit uses the BAT_EN signal to control the on / off state of the battery power supply. When BAT_EN is high, Q3 is turned on, pulling down the base voltage of Q4 to turn it off, thereby turning off the enable terminal of the DC-DC converter and stopping the VBAT output. The key detection circuit uses the SW1 key to feed back the key press status to KEY_WKUP and outputs a high or low level signal to determine the current key state.

[0017] The present invention further includes a power conversion circuit comprising a transistor Q2 connected to the input voltage VBAT, an inductor L1, a diode D2, and a resistor R32. The inductor L1 is connected to a boost converter Q1 and to pin 3 of the boost converter Q1. Pin 2 of the boost converter is connected to the resistor R32. The resistor R32 is also connected to a capacitor C14. Pin 1 of the boost converter is grounded. The transistor Q2 is connected to the capacitor C13. The resistor R32 is a zero-ohm resistor used for jumper connection.

[0018] The present invention further includes a battery power supply control circuit comprising resistors R14 and R15 connected to transistor Q2. Resistor R14 is connected to diode D4 and capacitor C48 in sequence and then grounded. One end of capacitor C48 is connected to a +5V voltage. Resistor R15 is connected to transistor Q4. The base of transistor Q4 is connected to resistor R17 and transistor Q3. The base of transistor Q3 is connected to resistor R18. Resistor R18 is connected to battery BAT-EN. A resistor R38 is provided between resistor R18 and the base of transistor Q3. Resistor R38 is connected to a 3.3V voltage. The emitter of transistor Q3 is connected to capacitor C49 and then grounded. A resistor R16 is connected between the base of transistor Q4 and resistor R17. The other end of resistor R16 is connected to the emitter of transistor Q4 and grounded.

[0019] In a further embodiment of this invention, the resistor R15 is connected to a key detection circuit, the key detection circuit includes a diode D1 connected to the resistor R15, the diode D1 is connected to a switch SW1, and a diode D4 and a resistor R19 are connected between the diode D1 and the switch SW1, with the resistor R19 connected to a 3.3V voltage.

[0020] The components in this utility model are described as follows:

[0021] Q1 (ME2108A33PG): Q1 is a DC-DC boost converter IC.

[0022] Q2 (S8550): An NPN transistor used to drive the LX (SwitchNode) pin of Q1, working in conjunction with L1 to boost the voltage. Q2 is controlled by Q4.

[0023] L1(22uH): Boost inductor used for DC-DC conversion.

[0024] D2(SD103AWS-7-F): Schottky diode, used as a freewheeling diode in a boost converter.

[0025] C13 (10uF / 25V): Output filter capacitor, used to smooth the output voltage of the DC-DC converter.

[0026] C14 (100uF / 16V): A larger output filter capacitor to further stabilize the output voltage.

[0027] R32 (0Ω 1%): A 0-ohm resistor, typically used as a jumper or test point.

[0028] Operating principle: Q1 acts as a boost IC, boosting the input voltage (VBAT) to 3.3V through the switching action of Q2 and L1. D2 prevents reverse current flow. C13 and C14 are used to filter out the output voltage ripple.

[0029] Q3 (S8550): PNP transistor, used to control the conduction of Q4.

[0030] Q4(S8050): An NPN transistor used to control the enable terminal of a DC-DC converter, thereby controlling the output of VBAT.

[0031] R16, R17 (3.3kΩ 1%): Resistors used to set the bias voltage of Q3 and Q4, thereby controlling their switching state.

[0032] R18 (3.3kΩ 1%): Pull-up resistor, used to ensure that Q3 is off when the BAT_EN signal is not activated.

[0033] R38 (3.3kΩ 1%): Voltage divider resistor, together with R18, determines the base voltage of Q3.

[0034] C49 (100nF / 50V): Filter capacitor used to filter out noise from the BAT_EN signal.

[0035] **BAT_EN:** Battery enable signal, active high.

[0036] Working principle: The BAT_EN signal is used to control the switching on and off of battery power. When BAT_EN is high, Q3 is turned on, pulling down the base voltage of Q4 and turning it off, thereby turning off the enable terminal of the DC-DC converter and stopping the VBAT output.

[0037] SW1(TS-1002S-05026C): A push-button switch.

[0038] D1(SD103AWS-7-F): Diode used to prevent reverse current flow.

[0039] D4 (LL4148): Diode used to isolate key signals.

[0040] R19 (10kΩ 1%): Pull-up resistor, used to ensure that the KEY_WKUP signal remains high when the button is not pressed.

[0041] KEY_WKUP: Key press wake-up signal.

[0042] Operating principle: When the SW1 button is pressed, the KEY_WKUP signal is pulled low, which may be used to wake up the system. D1 and D4 are used for isolation circuitry to ensure that the button signal does not affect other circuits.

[0043] D3(LL4148): Diode, used to provide certain voltage protection or clamping function.

[0044] C48 (100nF / 50V): Filter capacitor used to filter out noise from the +5V power supply.

[0045] The BAT_EN signal controls whether battery power is turned on or off.

[0046] The DC-DC converter boosts the battery voltage to 3.3V.

[0047] The SW1 button is used to wake up the system.

[0048] This invention can efficiently and stably convert the input voltage VBAT to 3.3V through a power conversion circuit, meeting the motor motherboard's requirement for a stable operating voltage and improving the stability of circuit operation.

[0049] The battery power supply control circuit can precisely control the on and off of battery power supply through the BAT_EN signal, realizing flexible management of battery power supply, effectively reducing power consumption and extending battery life.

[0050] The button detection circuit can accurately feed back the button press status to KEY_WKUP and output the corresponding level signal, enabling the motor mainboard to respond to button operations in a timely manner and improving the user experience.

[0051] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" as used throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0052] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes that element.

[0053] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept by means of the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A power management circuit for a motor main board, characterized by, The power conversion circuit, the battery power supply control circuit and the key detection circuit are connected with the input voltage VBAT, the battery power supply control circuit and the battery power supply control circuit respectively, the power conversion circuit is used for converting the input voltage VBAT into 3.3V, the battery power supply control circuit is used for controlling the opening and closing of the battery power supply through the BAT_EN signal, when the BAT_EN is high, Q3 is turned on, the Q4 base voltage is pulled down, and Q4 is turned off, so that the enable end of the DC-DC converter is closed, and the VBAT output is stopped; the key detection circuit is fed back to KEY_WKUP and outputs a high or low signal to judge the key state at this time through the SW1 key.

2. The power management circuit of a motor main board according to claim 1, wherein, The power conversion circuit includes a triode Q2 connected with the input voltage VBAT, an inductor L1, a diode D2, a resistor R32, the inductor L1 is connected with a boost converter Q1 and connected with the 3 pin of the boost converter Q1, the 2 pin of the boost converter is connected to the resistor R32, the resistor R32 is also connected with a capacitor C14, the 1 pin of the boost converter is grounded, and the triode Q2 is connected with the capacitor C13, wherein the resistor R32 is a zero ohm resistor for jumper use.

3. The power management circuit of a motor main board according to claim 2, wherein, The battery power supply control circuit includes a resistor R14 and a resistor R15 connected with the triode Q2, wherein the resistor R14 is connected with a diode D4 and a capacitor C48 in sequence and grounded, one end of the capacitor C48 is connected with +5V voltage, the resistor R15 is connected with a triode Q4, the base of the triode Q4 is connected with a resistor R17 and a triode Q3, the base of the triode Q3 is connected with a resistor R18, the resistor R18 is connected with the battery BAT-EN, a resistor R38 is arranged between the resistor R18 and the base of the triode Q3, the resistor R38 is connected with 3.3V voltage, the emitter of the triode Q3 is connected with the capacitor C49 and grounded, and the resistor R16 is arranged between the base of the triode Q4 and the resistor R17, the other end of the resistor R16 is connected with the emitter of the triode Q4 and grounded.

4. The power management circuit of a motor main board according to claim 3, wherein, The resistor R15 is connected with the key detection circuit, the key detection circuit includes a diode D1 connected with the resistor R15, the diode D1 is connected with a switch SW1, and a diode D4 and a resistor R19 are arranged between the diode D1 and the switch SW1, and the resistor R19 is connected with 3.3V voltage.

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