Ultra-low standby power control system with display internal power control

Abstract

The utility model relates to an ultralow standby power control system with a display internal power supply control function. Comprising a Panel power supply control circuit, a DC / DC control circuit, an MCU power supply control circuit and a USB3.0 HUB power supply control circuit. 90V-264VAC is connected to the display through the AC socket, when the display enters a standby state, the Panel VCC control circuit disconnects Panel VCC, the backlight control circuit outputs a panel backlight closing signal to the backlight driving circuit, the DC / DC power supply control circuit closes V11OFF, 2.5 V and 5V, the MCU power supply control circuit disconnects power supply of the serial port upgrading module, and the USB3.0HUB power supply control circuit closes a USB3.0HUB power supply. And the standby power of the display is ensured to be less than 0.4 W.

Description

Technical Field

[0001] The utility model relates to the field of energy-saving power of displays, in particular to a power supply control system inside a display. Background Art

[0002] In medical imaging system applications, in order to meet energy-saving certification requirements, it is necessary to ensure that the energy-saving power of the entire machine is less than 0.5W. However, monitors with USB HUBs are even more difficult to meet power requirements.

[0003] The existing technology cannot achieve the display having the MCU burning function and the HUB function while also meeting the conditions of energy saving and low power consumption. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an ultra-low standby power control system with internal display power control. This system not only achieves energy savings of less than 0.5W, but also features a KEY1 button that allows for either shutting down or enabling the hub power supply during energy conservation. This power supply shuts down the panel power supply, DC / DC converter, MCU power supply, and USB 3.0 hub power supply. Whether the hub power supply is shut down during energy conservation is selected by KEY1.

[0005] The technical solution adopted by the utility model is: an ultra-low standby power control system with internal power control of the display, including: a panel VCC control circuit connected to a video processing chip, a DC / DC control circuit, an MCU power control circuit, and a USB3.0HUB power control circuit;

[0006] The DC / DC control circuit and the USB3.0 HUB power supply control circuit are connected to the DC / DC step-down regulator.

[0007] The Panel VCC control circuit uses MOS tube U508 and transistor Q19;

[0008] The source of the MOS transistor U508 is connected to the +5V power supply through the resistor R642, and the source of the MOS transistor U508 is grounded through the capacitor C774; the drain is connected to the 5V power supply terminal PANEL_VCC, and the 5V power supply terminal PANEL_VCC is grounded through the capacitor C775;

[0009] The gate of the MOS transistor U508 is connected to the collector of the transistor Q19 via resistors R648 and R651, and is also connected to the source of the MOS transistor U508 via capacitor C539. The gate of the MOS transistor U508 is connected to the source of the MOS transistor U508 via resistors R648 and R645.

[0010] The base of the transistor Q19 is connected to the standby signal PANEL_ON terminal of the video processing chip through the resistor R645.

[0011] The DC / DC control circuit uses transistor Q522 and transistor Q523;

[0012] The collector of the transistor Q522 is connected to the enable pin of the DC / DC step-down voltage regulator through the resistor R873, the emitter of the transistor Q522 is grounded, the base of the transistor Q522 is connected to the collector of the transistor Q523, and is also connected to the 3.3V power supply through the resistor R862; the 3.3V power supply is connected to the standby signal Standby terminal of the video processing chip through the resistor R861;

[0013] The collector of the transistor Q523 is connected to the base of the transistor Q523 via the resistor R863, the base of the transistor Q523 is connected to the standby signal terminal of the video processing chip via the resistor R865, and the emitter of the transistor Q523 is grounded.

[0014] The MCU power control circuit uses MOS tube Q519 and MOS tube Q520;

[0015] The source of the MOS transistor Q519 is connected to a 3.3V power supply, the drain of the MOS transistor Q519 is connected to the power supply MCU_3.3V, the gate of the MOS transistor Q519 is connected to the drain of the MOS transistor Q520 through a resistor R788, and a resistor R786 and a capacitor C634 are connected in parallel between the gate and source of the MOS transistor Q519;

[0016] The source of the MOS transistor Q520 is grounded, and the gate of the MOS transistor Q520 is connected to the standby signal terminal of the video processing chip via resistors R790 and R949 in sequence; the node between the resistors R790 and R949 is connected to the 3.3V power supply via resistor R787 and is also grounded via capacitor C635.

[0017] The USB3.0HUB power control circuit uses a key KEY1, a transistor Q526 and a transistor Q527;

[0018] The two ends of the button KEY1 are connected to the collector of transistor Q526 and the enable pin of the HUB DC / DC buck regulator respectively;

[0019] The emitter of the transistor Q526 is grounded, the base of the transistor Q526 is connected to the collector of the transistor Q527, and is also connected to a 3.3V power supply through a resistor R892; the 3.3V power supply is connected to the standby signal Standby terminal of the video processing chip through a resistor R891;

[0020] The base of the transistor Q527 is connected to the standby signal terminal of the video processing chip via the resistor R894, and the emitter of the transistor Q527 is grounded.

[0021] The utility model has the following beneficial effects and advantages:

[0022] 1. The utility model can save energy power less than 0.4W.

[0023] 2. When the utility model is energy-saving, the HUB power supply can be turned off by pressing the key switch.

[0024] 2. The utility model adopts MCU power control circuit to turn off the MCU burning function when in standby mode.

[0025] 4. The utility model adopts MCU power control circuit, and the MCU burning function can be disabled when there is no control signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the hardware connection structure of the utility model;

[0027] Figure 2 This is a utility model Panel VCC control circuit diagram;

[0028] Figure 3 This is a utility model DC / DC control circuit diagram;

[0029] Figure 4 This is a utility model MCU power control circuit diagram;

[0030] Figure 5 This is a utility model USB3.0HUB power control circuit diagram. DETAILED DESCRIPTION

[0031] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0032] like Figure 1 The following diagram shows the hardware connection structure of this utility model. The hardware includes the panel VCC control circuit, DC / DC control circuit, MCU power control circuit, USB3.0 hub power control circuit, etc. The display's standby power is less than 0.4W.

[0033] Panel power control circuit, turns off the panel power;

[0034] DC / DC control circuit, turns off the display DC / DC and scaler power supply VCC_OFF;

[0035] MCU power control circuit, turns off the MCU power for serial port upgrade;

[0036] USB3.0 HUB power control circuit, selectively shuts down the HUB power.

[0037] The Panel VCC control circuit provides panel_5V to the LCD screen when the display is operating normally, and disconnects panel_5V when the display is saving energy.

[0038] The display DC / DC control circuit controls the working state of the DC / DC circuit, enabling the DC / DC circuit to work normally when the display is working normally, and enabling the DC / DC circuit to stop working when the display is saving energy.

[0039] The MCU power supply control circuit controls the working state of the serial port upgrade circuit, enables the serial port upgrade circuit to work normally when the display is working normally, and disables the serial port upgrade circuit when the display is saving energy.

[0040] The USB3.0 HUB power control circuit controls the working state of the HUB DC / DC circuit, enabling the HUB to work normally when the display is working normally, and enabling the HUB to stop working when the display is saving energy.

[0041] The AC / DC and DC / DC circuits are connected to each of the above circuits to power them and achieve a wide input power range. The AC / DC switching power supply uses the power management chip OB5269BCPA.

[0042] like Figure 2 As shown, the Panel VCC control circuit uses MOS tube U508 and transistor Q19. The source of the MOS tube U508 is connected to the 5V power supply through resistor R642, the drain is connected to PANEL_VCC, the gate is pulled up by R648 and R645, and connected to the collector of the transistor Q19 through R651. The collector of the transistor Q19 is connected to the gate of the MOS tube U508 through R651 and R648. The emitter of the transistor Q19 is grounded, and the base is connected to the standby signal. The standby signal is triggered by the video signal chip RTD2556, that is, it is connected to the standby signal PANEL_ON terminal of GPIO63 of the video processing chip RTD2256.

[0043] The panel VCC control circuit uses the MOS transistor U508 (model FDS4435) for panel power on / off. The panel VCC control circuit uses the standby signal and transistor Q19 (model MMBT3904) to control the U508 on / off.

[0044] like Figure 3As shown, the DC / DC control circuit uses transistors Q522 and Q523. The collector of transistor Q522 is connected to the enable pin PIN5 of the DC / DC step-down regulator RT8279 via resistor R873. The emitter of transistor Q522 is grounded, and the base of transistor Q522 is connected to the collector of Q523 and a pull-up resistor R862. The collector of transistor Q523 is connected to the base of Q522 and a pull-up resistor R862. The emitter of transistor Q523 is grounded, and the base is connected to the standby signal, namely, the GPIO67 standby signal terminal of the video processing chip RTD2256. The 3.3V power supply is connected to the GPIO67 standby signal terminal of the video processing chip RTD2256 via resistor R861.

[0045] The DC / DC control circuit uses transistor Q522 (model MMBT3904) to pull down the enable pin of the DC / DC chip. The DC / DC control circuit uses a standby signal and transistor Q523 (model MMBT3904) to control the on / off state of U522.

[0046] like Figure 4 As shown, the MCU power control circuit uses a MOS transistor Q519 and a MOS transistor Q520; the source of the MOS transistor Q519 is connected to the 3.3V power supply, the drain of the MOS transistor Q519 is connected to MCU_3.3V, and the gate of the MOS transistor Q519 is connected to the drain of the MOS transistor Q520 through R788; the source of the MOS transistor U520 is grounded, the drain of the MOS transistor U520 is connected to the gate of the MOS transistor Q519 through R788, the gate is pulled up by R787, and is connected to the standby signal through R790 and R949, that is, connected to the standby signal terminal of GPIO67 of the video processing chip RTD2256.

[0047] The MCU power control circuit uses MOS tube Q519, model AO3401, which is used for MCU power switch.

[0048] The MCU power control circuit uses the standby signal and MOS tube Q520, model Q520 is 2N7002, which is used to control the switch of U519.

[0049] like Figure 5 As shown, the USB3.0 HUB power control circuit is divided into a key enable circuit and a HUB DC / DC control circuit; the key enable circuit adopts a mechanical key KEY1;

[0050] The two ends of KEY1 are connected to the collector of MOS tube Q526, and the PIN5 enable pin of HUB DC / DC buck regulator RT8279D and the PIN6 enable pin of MP2315 respectively;

[0051] The MCU power control circuit uses transistors Q526 and Q527. The collector of transistor Q526 is connected to KEY1, the emitter of transistor Q526 is grounded, and the base of transistor Q522 is connected to the collector of Q527 and the pull-up resistor R892. The collector of transistor Q527 is connected to the base of Q526 and the pull-up resistor R891. The emitter of transistor Q527 is grounded, and the base is connected to the standby signal, that is, the standby signal terminal of GPIO67 of the video processing chip RTD2256.

[0052] The USB 3.0 hub power control circuit uses a swing switch KEY1, model SS-12D10, which is used to select whether to turn off the hub power supply during standby mode.

[0053] The USB 3.0 hub power control circuit uses the Q526 transistor (model MMBT3904) to pull down the DC / DC chip's enable pin. The DC / DC control circuit uses the standby signal and the Q527 transistor (model MMBT3904) to control the Q526's on / off function.

[0054] The video signal converter uses a CH7117 video signal conversion chip. The CH7117's input is connected to the DVI connector, capturing the DVI TMDS differential video signal from the PC and converting it into a CVBS video signal. This converted CVBS video signal is then output to the subsequent video amplifier circuit. The scaler uses the RTD2556QR, a state-of-the-art technology. The USB hub chip uses the CYUSB3314, a state-of-the-art technology. The DC / DC circuit uses the RT8279 and MP2315 DC / DC chips, respectively. The DC power conversion circuit connects to each of these circuits, providing power and ensuring a wide input power range.

Claims

1. Ultra-low standby power control system with display internal power control, characterized in that, include: Panel VCC control circuit, DC / DC control circuit, MCU power control circuit, USB3.0HUB power control circuit connected to the video processing chip; the DC / DC control circuit and USB3.0HUB power control circuit are connected to the DC / DC step-down regulator; The USB3.0HUB power control circuit uses a key KEY1, a transistor Q526 and a transistor Q527; The two ends of the key KEY1 are connected to the collector of the transistor Q526 and the enable pin of the DC / DC buck regulator respectively; The emitter of the transistor Q526 is grounded, the base of the transistor Q526 is connected to the collector of the transistor Q527, and is also connected to a 3.3V power supply through a resistor R892; the 3.3V power supply is connected to the standby signal Standby terminal of the video processing chip through a resistor R891; The base of the transistor Q527 is connected to the standby signal terminal of the video processing chip via the resistor R894, and the emitter of the transistor Q527 is grounded.

2. The ultra-low standby power control system with display internal power control according to claim 1, characterized in that: The Panel VCC control circuit uses MOS tube U508 and transistor Q19; The source of the MOS transistor U508 is connected to the +5V power supply through the resistor R642, and the source of the MOS transistor U508 is grounded through the capacitor C774; the drain is connected to the 5V power supply terminal PANEL_VCC, and the 5V power supply terminal PANEL_VCC is grounded through the capacitor C775; The gate of the MOS transistor U508 is connected to the collector of the transistor Q19 via resistors R648 and R651, and is also connected to the source of the MOS transistor U508 via capacitor C539. The gate of the MOS transistor U508 is connected to the source of the MOS transistor U508 via resistors R648 and R645. The base of the transistor Q19 is connected to the standby signal PANEL_ON terminal of the video processing chip through the resistor R645.

3. The ultra-low standby power control system with display internal power control according to claim 1, characterized in that: The DC / DC control circuit uses transistor Q522 and transistor Q523; The collector of the transistor Q522 is connected to the enable pin of the DC / DC buck regulator through a resistor R873, the emitter of the transistor Q522 is grounded, the base of the transistor Q522 is connected to the collector of the transistor Q523, and is also connected to a 3.3V power supply through a resistor R862; the 3.3V power supply is connected to the standby signal terminal of the video processing chip through a resistor R861; The collector of the transistor Q523 is connected to the base of the transistor Q523 via the resistor R863, the base of the transistor Q523 is connected to the standby signal terminal of the video processing chip via the resistor R865, and the emitter of the transistor Q523 is grounded.

4. The ultra-low standby power control system with display internal power control according to claim 1, characterized in that: The MCU power control circuit uses MOS tube Q519 and MOS tube Q520; The source of the MOS transistor Q519 is connected to a 3.3V power supply, the drain of the MOS transistor Q519 is connected to the power supply MCU_3.3V, the gate of the MOS transistor Q519 is connected to the drain of the MOS transistor Q520 through a resistor R788, and a resistor R786 and a capacitor C634 are connected in parallel between the gate and source of the MOS transistor Q519; The source of the MOS transistor Q520 is grounded, and the gate of the MOS transistor Q520 is connected to the standby signal terminal of the video processing chip via resistors R790 and R949 in sequence; the node between the resistors R790 and R949 is connected to the 3.3V power supply via resistor R787 and is also grounded via capacitor C635.

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