Mobile screen low power consumption circuit

Abstract

The utility model aims at providing a kind of mobile screen low-power consumption circuit, it is used to be connected with power module, PMIC respectively, including MCU, detection module and analog connection module, MCU is connected with power module, detection module includes button S2, MOS tube Q1, diode D2, diode D3, one end of button S2 is grounded, the other end of button S2 is connected in cathode of diode D2, cathode of diode D3 simultaneously, the anode of diode D2 is connected with PMIC, the anode of diode D3 is connected with power module and MCU respectively by MOS tube Q1, analog connection module includes MOS tube Q2 and MOS tube Q3, MOS tube Q2 is connected with power module and MCU respectively, MOS tube Q3 is connected with MOS tube Q2 and the anode of diode D2 respectively.

Description

Technical Field

[0001] This utility model relates to the technical field of circuits, and in particular to a low-power circuit for a mobile screen. Background Technology

[0002] With the growing demand for mobile office, smart home, and portable entertainment, mobile screen devices have become an important category in the consumer electronics field due to their flexibility and interactivity. The market has placed higher demands on the battery life, system stability, and energy-saving characteristics of mobile screens, especially in scenarios involving long periods of shutdown or standby. Reducing static power consumption has become a key indicator for improving user experience and product competitiveness.

[0003] like Figure 1 As shown, this is an existing mobile screen power supply circuit, including a power supply module 100, a PMIC (Power Management Integrated Circuit), and a SOC (System On Chip, the main chip of the mobile screen). The PMIC and SOC communicate with each other through a button module 400 to detect buttons. When a button is pressed to start the mobile screen, the detection module sends signals to the PMIC and SOC respectively, and at the same time starts the power supply module to enable the mobile screen to power on.

[0004] However, the existing standby circuit has the following shortcomings: As the main chip of the mobile screen, the SOC needs to detect the signal of the detection module in real time. Therefore, the SOC needs to be powered at all times, and the motherboard where the SOC is located also needs to be powered at all times. As a result, the mobile screen still maintains a certain amount of power consumption even when it is turned off or in standby mode.

[0005] Therefore, in order to further reduce the power consumption of mobile screens during shutdown and standby to improve their battery life, the low-power circuit for mobile screens of this application is proposed. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a low-power circuit for mobile screens that reduces power consumption during shutdown and standby to improve battery life.

[0007] The objective of this utility model is achieved through the following technical solution: A low-power circuit for a mobile screen, used to connect to a power supply module and a PMIC respectively, includes: MCU, which is connected to the power supply module; The detection module includes a button S2, a MOSFET Q1, a diode D2, and a diode D3. One end of the button S2 is grounded, and the other end of the button S2 is connected to the cathodes of both diodes D2 and D3. The anode of diode D2 is connected to the PMIC, and the anode of diode D3 is connected to both the power supply module and the MCU via the MOSFET Q1. An analog connection module is provided, comprising MOSFET Q2 and MOSFET Q3. MOSFET Q2 is connected to the power supply module and the MCU, respectively, and MOSFET Q3 is connected to the anode of MOSFET Q2 and the diode D2, respectively.

[0008] Optionally, the power supply module includes a charging board IC, a BUCK circuit, a PMOS soft-start circuit, and a DC-DC circuit connected in sequence. The charging board IC is used to connect to an adapter or a battery, the PMIC is connected to the DC-DC circuit, and the PMOS soft-start circuit is connected to the MCU.

[0009] Optionally, both diode D2 and diode D3 are Schottky diodes.

[0010] Optionally, a filter capacitor C3 is connected in parallel across the two ends of the button S2.

[0011] Optionally, the gate of the MOSFET Q1 is connected to the anode of the diode D3 through a resistor R2, the source of the MOSFET Q1 is grounded, the gate of the MOSFET Q1 is connected to the MCU through a resistor R5, the gate of the MOSFET Q1 is also connected to the Vcc terminal of the charging board IC through a resistor R4, and the end of the resistor R4 away from the MOSFET is also connected to the anode of the diode D3 through a resistor R3.

[0012] Optionally, the gate of MOSFET Q2 is connected to the MCU through resistor R5, the source of MOSFET Q2 is grounded, the source of MOSFET Q2 is connected to the Vcc terminal of the charging board IC through resistor R7, and the end of resistor R6 away from MOSFET Q2 is also connected to the Vcc terminal of the charging board IC through resistor R8. The gate of MOSFET Q3 is connected to the drain of MOSFET Q2 through resistor R9, the source of MOSFET Q3 and the source of MOSFET Q2 share the same ground, and the drain of MOSFET Q3 is connected to the anode of diode D2 through resistor R10.

[0013] Optionally, an L-type filter is also connected between the anode of the diode D2 and the PMIC.

[0014] Optionally, the PMIC is also connected to the MCU.

[0015] Compared with the prior art, the present invention has at least the following advantages: This invention discloses a low-power circuit for mobile screens, which is connected to a power supply module and a PMIC respectively. It includes an MCU, a detection module, and an analog connection module. The MCU is connected to the power supply module. The detection module includes a button S2, a MOSFET Q1, a diode D2, and a diode D3. One end of button S2 is grounded, and the other end is connected to the cathodes of both diodes D2 and D3. The anode of diode D2 is connected to the PMIC, and the anode of diode D3 is connected to both the power supply module and the MCU via MOSFET Q1. The analog connection module includes MOSFETs Q2 and Q3. MOSFET Q2 is connected to both the power supply module and the MCU, and MOSFET Q3 is connected to both MOSFET Q2 and the anode of diode D2. Thus, this low-power circuit for mobile screens uses the MCU, detection module, and analog connection module to jointly control the power supply module and PMIC, ensuring that the mobile screen is power-off in power-off and standby states. Compared to existing technologies that require continuous power supply to the motherboard, this low-power circuit effectively reduces the power consumption of the mobile screen during power-off and standby. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 Circuit diagram for power supply to existing mobile screens; Figure 2 This is a low-power circuit diagram of a mobile screen according to one embodiment of the present invention. Detailed Implementation

[0018] To facilitate understanding of this utility model, a more comprehensive description will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model.

[0019] like Figure 2As shown, a low-power circuit for a mobile screen is used to connect to a power supply module 100 and a PMIC. It includes an MCU, a detection module 200, and an analog connection module 300. The MCU is connected to the power supply module 100. The detection module 200 includes a button S2, a MOSFET Q1, a diode D2, and a diode D3. One end of the button S2 is grounded, and the other end of the button S2 is connected to the cathodes of both diode D2 and diode D3. The anode of diode D2 is connected to the PMIC, and the anode of diode D3 is connected to both the power supply module 100 and the MCU through the MOSFET Q1. The analog connection module 300 includes a MOSFET Q2 and a MOSFET Q3. The MOSFET Q2 is connected to both the power supply module 100 and the MCU, and the MOSFET Q3 is connected to both the MOSFET Q2 and the anode of diode D2.

[0020] It should be noted that when button S2 is pressed, the input signal state of the pin connected to the MCU is changed by MOSFET Q1. At this time, the MCU receives the signal that button S2 is pressed and changes the output signal of the pin connected to the power supply module 100, thereby enabling the power supply module 100 to start and supply power to the PMIC normally. At the same time, the MCU changes the output signal of the pin connected to MOSFET Q2, thereby changing the input signal of the pin used by the PMIC to detect whether button S2 is pressed by MOSFET Q3. Thus, after receiving the normal electrical signal from MOSFET Q3 (usually with a certain delay), the PMIC can execute the power-on program. In this way, the low-power circuit of the mobile screen of this application controls the power supply module 100 and the PMIC through the MCU, detection module 200 and analog connection module 300, thereby ensuring that the mobile screen is in a power-off state in the power-off and standby states. Compared with the prior art that needs to continuously supply power to the motherboard, the low-power circuit of the mobile screen of this application can effectively reduce the power consumption of the mobile screen in power-off and standby states. As an example, the PMIC model can be BQ25895. The MCU model can be AW9523B.

[0021] like Figure 2 As shown, in one embodiment, the power supply module 100 includes a charging board IC, a BUCK circuit, a PMOS soft-start circuit, and a DC-DC circuit connected in sequence. The charging board IC is used to connect to an adapter or a battery, the PMIC is connected to the DC-DC circuit, and the PMOS soft-start circuit is connected to the MCU.

[0022] It should be noted that the power supply module 100 is used to modulate the power supply to a suitable voltage for the PMIC. The PMOS soft-start circuit is connected to the PWREN pin of the MCU, which is the MCU's output pin. When the PWREN pin is low, the PMOS soft-start circuit is off, ultimately powering off the PMIC (the PMIC is soldered onto the motherboard, and the DC-DC circuit powers the motherboard; since the leakage current is very low when the PMOS soft-start circuit is off, the motherboard can be approximated as being power-off). When the PWREN pin is high, the PMOS soft-start circuit is activated, ultimately powering the PMIC. It should be noted that the charging board IC, BUCK circuit, PMOS soft-start circuit, and DC-DC circuit are all existing circuit structures, and their structures are not the part that needs to be protected in this application. Mature circuits from existing technologies can be directly used, and will not be elaborated upon here. As an example, the charging board IC model can be BQ25601.

[0023] In one embodiment, diodes D2 and D3 are both Schottky diodes.

[0024] Furthermore, such as Figure 2 As shown, in one embodiment, a filtering capacitor C3 is connected in parallel across the two ends of the button S2. Thus, capacitor C3 can eliminate voltage fluctuations generated when the button S2 is pressed and released.

[0025] like Figure 1 As shown, in one embodiment, the gate of MOSFET Q1 is connected to the anode of diode D3 through resistor R2, the source of MOSFET Q1 is grounded, the gate of MOSFET Q1 is connected to MCU through resistor R5, the gate of MOSFET Q1 is also connected to the Vcc terminal of charging board IC through resistor R4, and the end of resistor R4 away from MOSFET is also connected to the anode of diode D3 through resistor R3.

[0026] It should be noted that when button S2 is pressed, the gate of MOSFET Q1 changes from high level to low level, so MOSFET Q1 changes from being on to being off. The POWER_KEY_EDT pin used by the MCU to connect to MOSFET Q1 is an input pin. The signal on this pin changes from low level to high level. In this way, the MCU can know that button S2 has been pressed by the signal change of this input pin.

[0027] like Figure 2As shown, in one embodiment, the gate of MOSFET Q2 is connected to the MCU through resistor R5, the source of MOSFET Q2 is grounded, the source of MOSFET Q2 is connected to the Vcc terminal of the charging board IC through resistor R7, and the end of resistor R6 away from MOSFET Q2 is also connected to the Vcc terminal of the charging board IC through resistor R8. The gate of MOSFET Q3 is connected to the drain of MOSFET Q2 through resistor R9, the source of MOSFET Q3 and the source of MOSFET Q2 share the same ground, and the drain of MOSFET Q3 is connected to the anode of diode D2 through resistor R10.

[0028] It should be noted that the gate of MOSFET Q2 is connected to the POWER_KEY pin of the MCU through resistor R5. This pin is the output pin of the MCU. When the MCU's POWER_KEY_EDT pin is low, that is, when button S2 is not pressed, the PWREN pin outputs a low level, the PMOS soft-start circuit is off, and the POWER_KEY pin outputs a high level, so MOSFET Q2 is in the conducting state. The gate of MOSFET Q3 is low, so MOSFET Q3 is in the off state. When the MCU's POWER_KEY_EDT pin goes high, the PWREN pin outputs a high level, the PMOS soft-start circuit starts, and the PMIC is powered normally. At the same time, the POWER_KEY pin outputs a low level, MOSFET Q2 is in the off state, the gate of MOSFET Q3 is high, and MOSFET Q3 is conducting. Therefore, the anode of diode D2 goes low, which is equivalent to the MCU providing a long-lasting analog button signal to the PMIC. At this time, the PMIC can execute the mobile screen power-on startup program. Thus, when button S2 is not pressed, the MCU controls the PWREN pin to output a low level, the PMOS soft-start circuit is turned off, and the motherboard is powered off, thereby effectively reducing the power consumption of the motherboard.

[0029] like Figure 2 As shown, in one embodiment, an L-type filter is also connected between the anode of diode D2 and the PMIC. This eliminates input signal interference to the PMIC.

[0030] like Figure 2 As shown, in one embodiment, the PMIC is also connected to the MCU. Specifically, the PMIC's output pin PWRHOLD is connected to the MCU's input pin PWRHOLD. When the PMIC detects that all BUCK circuits have been powered on normally according to the power-on sequence and after a certain delay, the PMIC will output a high level on the pin connected to the MCU. The MCU will then maintain a high level output on the PWRHOLD pin to ensure that the PMOS soft-start circuit continues to start normally.

[0031] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. Unless otherwise specifically defined, the installation / fixing / setting mentioned in this utility model can be understood as including, but not limited to, locking and fixing with screws / bolts, welding, or bonding with adhesives, wherein the adhesives used can be commercially available finished products. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A low-power circuit for a mobile screen, used to connect to a power supply module and a PMIC respectively, characterized in that, include: MCU, which is connected to the power supply module; The detection module includes a button S2, a MOSFET Q1, a diode D2, and a diode D3. One end of the button S2 is grounded, and the other end of the button S2 is connected to the cathodes of both diode D2 and diode D3. The anode of diode D2 is connected to the PMIC, and the anode of diode D3 is connected to the power supply module and the MCU through the MOSFET Q1. and An analog connection module is provided, comprising MOSFET Q2 and MOSFET Q3. MOSFET Q2 is connected to the power supply module and the MCU, respectively, and MOSFET Q3 is connected to the anode of MOSFET Q2 and the diode D2, respectively.

2. The low-power circuit for mobile screens according to claim 1, characterized in that, The power supply module includes a charging board IC, a BUCK circuit, a PMOS soft-start circuit, and a DC-DC circuit connected in sequence. The charging board IC is used to connect to an adapter or a battery, the PMIC is connected to the DC-DC circuit, and the PMOS soft-start circuit is connected to the MCU.

3. The low-power circuit for mobile screens according to claim 1, characterized in that, Both diodes D2 and D3 are Schottky diodes.

4. The low-power circuit for mobile screens according to claim 1, characterized in that, An interference filtering capacitor C3 is connected in parallel across the two ends of the button S2.

5. The low-power circuit for mobile screens according to claim 2, characterized in that, The gate of the MOSFET Q1 is connected to the anode of the diode D3 through resistor R2. The source of the MOSFET Q1 is grounded. The gate of the MOSFET Q1 is connected to the MCU through resistor R5. The gate of the MOSFET Q1 is also connected to the Vcc terminal of the charging board IC through resistor R4. The end of resistor R4 away from the MOSFET is also connected to the anode of the diode D3 through resistor R3.

6. The low-power circuit for mobile screens according to claim 2, characterized in that, The gate of MOSFET Q2 is connected to the MCU through resistor R5. The source of MOSFET Q2 is grounded. The source of MOSFET Q2 is connected to the Vcc terminal of the charging board IC through resistor R7. The end of resistor R6 away from MOSFET Q2 is also connected to the Vcc terminal of the charging board IC through resistor R8. The gate of MOSFET Q3 is connected to the drain of MOSFET Q2 through resistor R9. The source of MOSFET Q3 shares a common ground with the source of MOSFET Q2. The drain of MOSFET Q3 is connected to the anode of diode D2 through resistor R10.

7. The low-power circuit for mobile screens according to claim 1, characterized in that, An L-type filter is also connected between the anode of the diode D2 and the PMIC.

8. The low-power circuit for mobile screens according to claim 1, characterized in that, The PMIC is also connected to the MCU.

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