Rapid discharging circuit structure

Abstract

The utility model discloses a rapid discharge circuit structure, comprising a power supply management IC and a display screen connected with the power supply management IC, an ELVDD end and an ELVSS end of a voltage supply management module of the power supply management IC are respectively connected with the display screen, one end of an ELVDD switch of a rapid on-off module of the power supply management IC is electrically connected with the ELVDD end, one end of an ELVSS switch is electrically connected with the ELVSS end, and the other end of the ELVSS switch is electrically connected with the ELVSS end. The other end of the ELVDD switch and the other end of the ELVSS switch are connected with a grounding circuit, the rapid on-off module is additionally arranged in the power management IC, a traditional circuit structure in which rapid discharging is achieved by matching MOS tubes, capacitors and resistors outside the ELVDD end and the ELVSS end is replaced, the number of used components is reduced, and the impact of rapid discharging on the power management IC and a display screen is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power management circuits, in particular to the technical field of AMOLED fast-discharging circuits. Background Art

[0002] Due to the characteristics of AMOLED display, such as bright display effect, high contrast and small screen, it is widely used in smart watch projects. When the AMOLED display is lit, ELVDD and ELVSS voltages are required to supply the screen. Figure 1 In the prior art, a power chip (POWER IC) is used to generate ELVDD and ELVSS. However, due to the residual charge when powering off, the ELVDD and ELVSS ends power off slowly, which causes the AMOLED to power off abnormally, and sometimes a white line or a flashing screen will appear. To solve this problem, MOS tubes and capacitors and resistors are usually used outside the ELVDD and ELVSS ends to achieve fast discharge. However, this will use more components, affect the structural space of the smart watch, and on the other hand, increase the cost. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a circuit structure in which a fast on-off circuit is added to a power management IC chip, thereby reducing components and simplifying the system circuit.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A fast discharge circuit structure includes a power management IC and a display screen connected to the power management IC, the power management IC includes a supply voltage management module and a fast on-off module, the ELVDD end and the ELVSS end of the supply voltage management module are respectively connected to the display screen, the fast on-off module includes an ELVDD switch, an ELVSS switch and a grounding circuit, one end of the ELVDD switch is electrically connected to the ELVDD end, one end of the ELVSS switch is electrically connected to the ELVSS end, and the other ends of the ELVDD switch and the ELVSS switch are connected to the grounding circuit.

[0006] Preferably, the display screen is an AMOLED display screen.

[0007] Preferably, the power management IC is a power chip or a power supply chip.

[0008] Furthermore, the ELVDD terminal and the ELVSS terminal are provided with a converter for converting and outputting the received external voltage.

[0009] Furthermore, the external EN pin of the power management IC is used as an enable control pin to effectively manage the use of power. The power management IC is also externally connected to a SWIRE switch line to connect an external control device or line to control the rapid switching, startup and shutdown of the power management IC.

[0010] Furthermore, the power management IC is provided with a comparator and a preset voltage for monitoring the voltage transmitted by the enable signal.

[0011] Furthermore, the power management IC is provided with a microcontroller and a timer.

[0012] Furthermore, the power management IC has over-current and over-voltage protection functions to prevent damage to the IC and the load due to excessive current or voltage caused by rapid switching.

[0013] Furthermore, the power management IC is connected to an LC filter.

[0014] Furthermore, the ELVDD switch and the ELVSS switch of the fast on-off module use MOSFET or JFET as switch elements.

[0015] The utility model adds a fast on-off module in the power management IC. When the power needs to be turned off, the values ​​of the ELVDD terminal and the ELVSS terminal are modified to zero by setting. At this time, the ELVDD terminal and the ELVSS terminal will slowly lose power, and then drop to a set voltage value. The power management IC quickly switches to the fast on-off module, closes the ELVDD switch and the ELVSS switch, and grounds the ELVDD terminal and the ELVSS terminal, so that the voltage of the ELVDD terminal and the ELVSS terminal is instantly powered off to zero, thereby replacing the traditional circuit structure in which the ELVDD terminal and the ELVSS terminal are matched with a MOS tube and a capacitor and a resistor to realize fast discharge, reducing the use of components and devices, and reducing the impact of fast discharge on the power management IC and the display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 The figure is a schematic diagram of the structure of a fast discharge circuit in the prior art.

[0018] Figure 2 The figure is a schematic diagram of the circuit structure of an embodiment of the utility model. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0020] It should be noted that the term "connection" used in this article includes not only the connection between two things but also the connection with an intermediate component or peripheral circuit structure between the two things. The terms "one end", "the other end" and similar expressions used in this article are for illustrative purposes only and do not represent the only implementation method.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0022] The utility model discloses a fast discharge circuit structure, which includes a power management IC and a display screen connected to the power management IC, wherein the power management IC includes a voltage supply management module and a fast on-off module, wherein the ELVDD end and the ELVSS end of the voltage supply management module are respectively connected to the display screen, and the fast on-off module includes an ELVDD switch, an ELVSS switch and a grounding circuit, wherein one end of the ELVDD switch is electrically connected to the ELVDD end, one end of the ELVSS switch is electrically connected to the ELVSS end, and the other ends of the ELVDD switch and the ELVSS switch are connected to the grounding circuit, so that when the circuit structure receives a valid signal, the power management IC will start working and output the required power supply voltage for the display screen through the voltage supply management module, and when an invalid state is received, the power management IC will start the fast on-off module to form a fast on-off circuit, turn off the relevant power output, and enter a fast discharge state.

[0023] See also Figure 2 In an embodiment, the display screen is an AMOLED display screen, and the power management IC adopts a power chip.

[0024] Driving the OLED of an AMOLED display requires positive and negative voltages, and the afterimage caused by untimely rapid discharge of the AMOLED display is one of the main problems it faces. The utility model can better solve this problem based on the existing technology.

[0025] In this embodiment, a converter is provided at the ELVDD terminal and the ELVSS terminal for converting and outputting the received external voltage.

[0026] In this embodiment, the power chip is connected to an external EN pin as an enable control pin to effectively manage the use of power. When the EN pin receives a high level, the chip starts working; when the EN pin receives a low level, the chip stops working. By controlling the EN pin, the use of power can be effectively managed to achieve functions such as saving power and extending battery life. The power chip is also connected to an external SWIRE switch line to connect to an external control device or line to achieve fast switching, startup and shutdown of the power chip, thereby meeting different power requirements of the system.

[0027] In this embodiment, the power chip is provided with a comparator and a preset voltage for monitoring the voltage transmitted by the enable signal. When the voltage drops to the preset voltage, the comparator triggers the corresponding control logic, so that the power chip enters a low-power mode or shuts down some unnecessary functional modules for voltage supply. The power chip is also provided with a microcontroller and a timer, which can gradually reduce the output voltage of the power supply circuit by reducing the clock frequency or stopping the clock through the microcontroller and the timer, that is, when the power chip is started or shut down, it is achieved by gradually increasing or decreasing the output voltage or current to reduce the impact and surge on the display screen.

[0028] In this embodiment, the power chip has over-current and over-voltage protection functions to prevent damage to the IC and the load due to excessive current or voltage caused by rapid switching.

[0029] In this embodiment, LC filters are connected to the input and output ends of the power chip to reduce ripples and noise in the power input and output.

[0030] In this embodiment, the ELVDD switch and the ELVSS switch use metal oxide semiconductor field effect transistors (MOSFET) or junction field effect transistors (JFET) as switching elements, so that after the power management circuit reduces the voltage to a certain level, they can achieve fast switching and quickly ground the ELVDD terminal and the ELVSS terminal.

[0031] It should be noted that the circuit structure also includes other peripheral circuits, but since the purpose of their configuration is the same or similar to that in the prior art, the present invention does not impose specific limitations on this.

[0032] In summary, the utility model adds a fast on-off module in the power management IC to replace the traditional circuit structure of achieving fast discharge with MOS tubes and capacitors and resistors outside the ELVDD and ELVSS terminals, thereby reducing the use of components and reducing the impact of fast discharge on the power management IC and the display.

[0033] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A fast discharge circuit structure, characterized in that: The circuit structure includes a power management IC and a display screen connected to the power management IC, the power management IC includes a supply voltage management module and a fast on-off module, the ELVDD end and the ELVSS end of the supply voltage management module are respectively connected to the display screen, the fast on-off module includes an ELVDD switch, an ELVSS switch and a grounding circuit, one end of the ELVDD switch is electrically connected to the ELVDD end, one end of the ELVSS switch is electrically connected to the ELVSS end, and the other ends of the ELVDD switch and the ELVSS switch are connected to the grounding circuit.

2. The fast discharge circuit structure according to claim 1, characterized in that: The display screen is an AMOLED display screen.

3. The fast discharge circuit structure according to claim 1, characterized in that: The power management IC is a power chip or a power supply chip.

4. The fast discharge circuit structure according to claim 1, characterized in that: The ELVDD terminal and the ELVSS terminal are provided with a converter for converting and outputting the received external voltage.

5. The fast discharge circuit structure according to claim 1, characterized in that: The power management IC is externally connected to an EN pin as an enable control pin to effectively manage the use of power. The power management IC is also externally connected to a SWIRE switch line to connect an external control device or line to control the rapid switching, startup and shutdown of the power management IC.

6. The fast discharge circuit structure according to claim 1, characterized in that: The power management IC is provided with a comparator and a preset voltage for monitoring the voltage transmitted by the enable signal.

7. The fast discharge circuit structure according to claim 1, characterized in that: The power management IC is provided with a microcontroller and a sequencer.

8. The fast discharge circuit structure according to claim 1, characterized in that: The power management IC has over-current and over-voltage protection functions to prevent damage to the IC and load due to excessive current or voltage caused by fast switching.

9. The fast discharge circuit structure according to claim 1, characterized in that: The power management IC is connected to an LC filter.

10. The fast discharge circuit structure according to claim 1, characterized in that: The ELVDD switch and the ELVSS switch use MOSFET or JFET as switch elements.

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