CN108398996A - Method for managing power supply and electronic system - Google Patents

Abstract

The present disclosure relates to the technical field of power supply systems, and proposes a power management method. The instantaneous current reduction method includes: detecting the validity of the backlight black insertion enable signal; if the backlight black insertion enable signal is valid, turning off peripherals to The current is reduced; after a set period of time, the peripheral is turned on. Using this method can reduce the current of the virtual reality device when the backlight is plugged in black.

Description

Power management method and electronic system

technical field

The present disclosure relates to the technical field of power systems, in particular, to a power management method and an electronic system using the power management method.

Background technique

With the rapid development of smart devices and the improvement of related technologies, the requirements for devices with liquid crystal displays are getting higher and higher, such as green, energy saving, high efficiency, safety, etc. However, the higher the performance of the device or technology, the higher the power supply requirements The requirements will increase accordingly. The backlight black insertion technology of liquid crystal display is a more commonly used technology. The backlight black insertion technology can make the original picture with smear clear, but the backlight black insertion technology has high requirements on the backlight current.

At present, for virtual reality equipment, in the design of the whole machine, most of the liquid crystal displays used on the equipment belong to the same power supply system as the control circuit, and the instantaneous rise of the current has a great impact on the power supply of other circuits. The current of the liquid crystal display in the virtual reality device rises rapidly when the backlight is plugged in black (3 times or more than the time period of non-black plugging) and the holding time is short (generally 1 ~ 2ms). To prevent overcurrent, the power adapter must be pressed instantaneously Value matching puts forward very high requirements on the power adapter; moreover, when the power supply line is long (greater than 3m), the voltage drop of the power supply line is relatively large, resulting in a sudden drop in the inlet voltage of the virtual reality device, which affects the CPU and power supply of the whole machine. Other peripherals work normally. Therefore, when designing, the selection of the motherboard integrated circuit, the length of the power supply line, and the power adapter are all limited, which reduces the system performance and reliability.

Therefore, it is necessary to study a power management method and an electronic system using the power management method.

It should be noted that the information disclosed in the above background section is only for enhancing the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to those of ordinary skill in the art.

Contents of the invention

The purpose of the present disclosure is to overcome the shortcoming of the rapid rise of the current when the backlight is inserted into the black in the above-mentioned prior art, and provide a power management method with low current when the backlight is inserted into the black, and an electronic system using the power management method.

According to one aspect of the present disclosure, there is provided a power management method for a system including a display device, a control unit, and peripherals, including:

Detecting the validity of the backlight black insertion enabling signal of the display device;

If the backlight black insertion enabling signal is valid, the control unit closes the currently controlled peripheral;

Turn off peripherals back on after a set period of time.

In an exemplary embodiment of the present disclosure, the peripheral device includes one or more of an indicator light, a communication device, an interface device, and a sensor.

In an exemplary embodiment of the present disclosure, the control unit controls the peripherals in a polling manner.

In an exemplary embodiment of the present disclosure, the polling control period of the control unit for the peripheral device is determined according to the refresh frequency of the display device.

In an exemplary embodiment of the present disclosure, the operating time of the peripheral is a multiple of the polling control period.

In an exemplary embodiment of the present disclosure, the set time period is the duration of black insertion of the backlight.

In an exemplary embodiment of the present disclosure, the display device is a smart display unit.

According to one aspect of the present disclosure, an electronic system is provided, including a display device, a control unit and peripherals, including: the control unit is used to detect the validity of the backlight black insertion enable signal of the display device, and detect the When the backlight black insertion enable signal is valid, the currently controlled peripheral is turned off, and after a set period of time, the turned off peripheral is turned on again.

In an exemplary embodiment of the present disclosure, the control unit controls the peripherals in a polling manner.

In an exemplary embodiment of the present disclosure, the set time period is the duration of black insertion of the backlight.

In the power management method of the present disclosure, first, the effectiveness of the backlight black insertion enable signal is detected; if the backlight black insertion enable signal is valid, the peripheral device is turned off to reduce the current; the peripheral device is turned on after a set period of time. On the one hand, when the backlight is plugged in black, the current is reduced by turning off the peripherals, thereby reducing the power supply current of the whole machine, which reduces the requirements for the motherboard integrated circuit, the length of the power supply line, and the power adapter during design, and improves the reliability of the circuit. performance and overall device reliability. On the other hand, the current is reduced to achieve the purpose of energy saving and emission reduction. On the other hand, the black-insertion time of the backlight is relatively short, and the peripheral device is turned on after the set time period, which will not affect the operation of the device.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description serve to explain the principles of the disclosure. Apparently, the drawings in the following description are only some embodiments of the present disclosure, and those skilled in the art can obtain other drawings according to these drawings without creative efforts.

Fig. 1 schematically shows a flowchart of a power management method.

FIG. 2 schematically shows a program flow chart of the power management method.

FIG. 3 schematically shows an exploded view of a polling control cycle of an exemplary embodiment of a power management method.

FIG. 4 schematically shows a working current waveform diagram of the power management method.

Fig. 5 schematically shows a block diagram of the electronic system.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details being omitted, or other methods, components, devices, steps, etc. may be adopted. In other instances, well-known technical solutions have not been shown or described in detail to avoid obscuring aspects of the present disclosure.

Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus repeated descriptions thereof will be omitted. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in software, or in one or more hardware modules or integrated circuits, or in different network and/or processor means and/or microcontroller means.

This exemplary embodiment firstly provides a power management method, which can be used in a system including a display device, a control unit, peripheral devices, and the like. Referring to the flowchart of the power management method shown in FIG. 1, the power management method may include the following steps:

Step S10 , detecting the validity of the black insertion enable signal of the backlight of the display device.

Step S20, if the backlight and black insertion enabling signal is valid, the control unit shuts down the currently controlled peripheral.

Step S30, after a set period of time, restart the turned off peripherals.

According to the power management method in this exemplary embodiment, on the one hand, when the backlight is plugged into the black, the current is reduced by turning off the peripherals, thereby reducing the power supply current of the whole machine, so that when designing, the main board integrated circuit, the length of the power supply line and The requirements for the power adapter are reduced, and the reliability of the circuit and the reliability of the entire device are improved. On the other hand, the current is reduced to achieve the purpose of energy saving and emission reduction. On the other hand, the black-insertion time of the backlight is relatively short, and the peripheral device is turned on after the set time period, which will not affect the operation of the device.

Next, the power management method in this exemplary embodiment will be further described.

The display device is an intelligent display unit. In this example embodiment, the display device is an augmented reality or virtual reality display device, and the control unit may be a CPU. Of course, the display device can also be an ordinary TV display screen, a computer display screen or the like. According to different classification standards, the display device may also be a liquid crystal display device, a light emitting diode display device, an organic light emitting diode display device, and the like. The control unit can also be a device with control functions such as a microprocessor and an industrial computer. Peripherals may include one or more of indicator lights, communication devices, interface devices, and sensors.

Refer to the program flowchart of the power management method shown in FIG. 2 .

During initialization, you can set the refresh rate of the virtual reality device and the duration of the backlight insertion black. In this example implementation manner, the black insertion duration of the backlight may specifically be 1.1 ms, and the refresh frequency may be 90 Hz. Of course, those skilled in the art can understand that the refresh rate can be set to 80 Hz, 100 Hz, etc. according to the requirements of the virtual reality device.

In step S10 , the validity of the black insertion enable signal of the backlight of the display device is detected.

In this exemplary embodiment, detecting the validity of the backlight black insertion enable signal is to detect whether the backlight is on. If the backlight is on, it means the backlight black insertion enable signal is valid, and if the backlight is not on, it is the backlight black insertion enable signal. invalid.

In step S20, if the backlight and black insertion enabling signal is valid, the control unit turns off the currently controlled peripheral device to reduce the current.

In this example implementation, the number of peripherals that are turned off may be one, that is, only one peripheral is turned off during the backlight insertion period within a polling control cycle, and the rest of the peripherals work normally. Moreover, the order in which the peripherals are turned off can be pre-set. For the convenience described below, each peripheral may be referred to as a first peripheral, a second peripheral, a third peripheral, a fourth peripheral, and so on. The order of closing the peripherals can be set as closing the first peripheral, closing the second peripheral, closing the third peripheral, closing the fourth peripheral, and so on.

The control unit controls the peripherals in a polling manner. Polling is a way for the CPU to decide how to provide peripheral device services, also known as "programmed I/O". The concept of the polling method is that the CPU sends out inquiries at regular intervals, and asks each peripheral device in sequence whether it needs its service, and provides the service as soon as it is available, and then asks the next peripheral device after the service is over, and then repeats itself continuously. The polling sequence of the control unit can be set as the first peripheral, the second peripheral, the third peripheral, and the fourth peripheral.

In this example implementation, the polling control period of the control unit for the peripheral is determined according to the refresh frequency of the display device. Specifically, the polling control period of the CPU to the peripheral is determined according to the refresh frequency of the virtual reality device. Certainly, the polling control period of the CPU to the peripherals may be determined before detecting the validity of the backlight black insertion enable signal, or after detecting the validity of the backlight black insertion enable signal. For example: the refresh rate of the virtual reality device is 90Hz, and the polling control cycle of the CPU to the peripheral is 1s/90≈11ms.

Before turning off the peripherals to reduce the current, the instantaneous current reduction method may also include: the CPU inquires the peripherals to determine the operating time of the peripherals, and determines the number of cycles in several consecutive rounds according to the multiple relationship between the operating time and the polling control cycle. The peripheral is turned off during the query control cycle.

The determination of the multiple relationship between the operation time and the polling control period is as follows: the operation time is less than or equal to the polling control period, and the operation time is determined to be one time of the polling control period; the operation time is greater than one time of the polling control period and less than or If it is equal to twice the polling control period, it is determined that the operation time is twice the polling control period; if the operation time is greater than twice the polling control period and less than or equal to three times the polling control period, it is determined that the operation time is the polling control period The determination method of three times, four times, five times, etc. of the query control cycle can be deduced by analogy, and will not be repeated.

According to the multiple relationship between the operation time and the polling control cycle, it is determined to turn off the peripheral within several consecutive polling control cycles, specifically: if the operating time of the peripheral is twice the polling control cycle, that is, the operating time is less than or equal to the polling control cycle polling control cycle, then turn off the peripheral in the polling control cycle, in the next polling control cycle, if the backlight black insertion enable signal is valid, turn off another peripheral to reduce the current; if the peripheral The operation time is n times the polling control cycle, where n is greater than 1, and n can be 2, 3, 4, etc., then within n consecutive polling control cycles, if the backlight black insertion enable signal is valid, it will be turned off The current of the peripheral device is reduced; that is, the peripheral device is turned off in the polling control cycle, and the peripheral device is also turned off in the following n-1 polling control cycles.

In step S30, after a set period of time, the turned off peripherals are turned on again.

In this example implementation, the set time period may be the duration of black insertion of the backlight. Specifically, the duration of black insertion of the backlight may be 1.1 ms. That is, in a polling control cycle of 11ms, 1.1ms of the duration of backlight insertion black is non-working time, and the remaining 9.9ms is normal working time. After the peripheral is turned off for 1.1ms, the peripheral is turned on. Of course, in other example implementations of the present invention, the black insertion duration of the backlight may also be 0.9ms, 1.2ms, 1.3ms, etc., which is not specifically limited here.

Refer to the exploded diagram of the polling control cycle of an exemplary embodiment of the power management method shown in FIG. 3 . The black segment in the figure is the shutdown period of each peripheral, and the shaded segment is the normal working period of each peripheral.

It has been determined that the operating time of the first peripheral is twice the polling control period, the operating time of the second peripheral is twice the polling control period, and the operating time of the third peripheral is twice the polling control period, The operation time of the fourth peripheral is three times of the polling control period.

The polling sequence of the four peripherals is set as follows: the first peripheral, the second peripheral, the third peripheral, and the fourth peripheral, and the cycle is repeated according to the above sequence.

In the first polling control cycle, if it is detected that the backlight black insertion enable signal is valid, the first peripheral device will be turned off. After the backlight black insertion is completed, the first peripheral device will be turned on. After the first polling control cycle ends, the second The operation of a peripheral device also ends.

In the second polling control cycle, if it is detected that the backlight black insertion enable signal is valid, the second peripheral device will be turned off, and the second peripheral device will be turned on after the backlight black insertion is completed; in the third polling control cycle, the detection When the backlight black insertion enable signal is valid, the second peripheral is still turned off because the operation of the second peripheral has not been completed. After the backlight black insertion is completed, the second peripheral is turned on. After the third polling control cycle ends, The operation of the second peripheral also ends.

In the fourth polling control cycle, if it is detected that the backlight black insertion enable signal is valid, the third peripheral is turned off, and the third peripheral is turned on after the backlight black insertion is completed. After the fourth polling control cycle ends, the third peripheral The operation of the three peripherals also ends.

In the fifth polling control cycle, if it is detected that the backlight black insertion enable signal is valid, the fourth peripheral is turned off, and the fourth peripheral is turned on after the backlight black insertion is completed; in the sixth polling control cycle, the detection Until the backlight black insertion enable signal is valid, since the operation of the fourth peripheral has not been completed, the fourth peripheral is still turned off, and the fourth peripheral is turned on after the backlight black insertion is completed; in the seventh polling control cycle, It is detected that the backlight black insertion enable signal is valid, and since the operation time of the fourth peripheral is three times the polling control cycle, the operation of the fourth peripheral has not been completed at this time, then the fourth peripheral is still turned off, and the backlight black insertion After the completion, the fourth peripheral is turned on; after the seventh polling control cycle ends, the operation of the fourth peripheral also ends.

By analogy, until all peripherals are turned off in sequence, one polling is completed. Therefore, the greater the number of peripherals, the longer the polling time will be. The duration of one polling is the product of the polling control cycle and the number of polling control cycles. In this exemplary embodiment, the duration of one polling is 11ms*7=77ms.

Refer to the working current waveform diagram of the power management method shown in FIG. 4 . When the backlight is plugged in black, the backlight current suddenly rises. Through timing control, a certain peripheral is turned off when the backlight is inserted into the black, so that the current of the CPU and peripherals is significantly reduced when the backlight is inserted into the black. The backlight current is added to the current of the CPU and peripherals to form the current of the whole machine. When the backlight is plugged in black, the cumulative value of the two currents decreases significantly, which reduces the current of the whole machine, and the instantaneous current also decreases.

In addition, in other example implementations of the present invention, the number of turned off peripherals may be multiple. That is to say, two, three or more peripherals can be turned off during the backlight insertion period in a polling control cycle, and the remaining peripherals work normally. The more peripherals that are turned off, the greater the current reduction.

In addition, although steps of the methods of the present disclosure are depicted in the drawings in a particular order, there is no requirement or implication that the steps must be performed in that particular order, or that all illustrated steps must be performed to achieve the desired result. Additionally or alternatively, certain steps may be omitted, multiple steps may be combined into one step for execution, and/or one step may be decomposed into multiple steps for execution, etc.

Further, the present invention also provides an electronic system using the above power management method, refer to the block diagram of the electronic system shown in FIG. 5 . The electronic system includes a display device 5, a control unit 6, peripherals 7, etc., the control unit 6 is used to detect the validity of the backlight black insertion enable signal of the display device 5, and the control unit 6 detects the validity of the backlight insertion black enable signal of the display device 5. When the black enable signal is valid, the control unit 6 controls to turn off the currently controlled peripheral device, and after a set time period, the control unit 6 controls to turn on the closed peripheral device 7 again.

In this exemplary embodiment, the control unit 6 controls the peripheral device 7 in a polling manner.

In this exemplary embodiment, the set time period is the duration of black insertion of the backlight.

The specific details of each part of the above electronic system have been described in detail in the corresponding power management method, so details will not be repeated here.

It should be noted that although several modules or units of the device for action execution are mentioned in the above detailed description, this division is not mandatory. Actually, according to the embodiment of the present disclosure, the features and functions of two or more modules or units described above may be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided to be embodied by a plurality of modules or units.

Through the description of the above implementations, those skilled in the art can easily understand that the example implementations described here can be implemented by software, or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of the present disclosure can be embodied in the form of software products, and the software products can be stored in a non-volatile storage medium (which can be CD-ROM, U disk, mobile hard disk, etc.) or on the network , including several instructions to make a computing device (which may be a personal computer, a server, a mobile terminal, or a network device, etc.) execute the method according to the embodiments of the present disclosure.

Other embodiments of the present disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, and these modifications, uses or adaptations follow the general principles of the present disclosure and include common knowledge or conventional technical means in the technical field not disclosed in the present disclosure . The specification and examples are to be considered exemplary only, with the true scope and spirit of the disclosure indicated by the appended claims.

Claims (10)

1. A power management method for a system comprising a display device, a control unit and peripherals, characterized in that comprising: Detecting the validity of the backlight black insertion enabling signal of the display device; If the backlight black insertion enabling signal is valid, the control unit closes the currently controlled peripheral; Turn off peripherals back on after a set period of time. 2. The power management method according to claim 1, wherein the peripheral device includes one or more of an indicator light, a communication device, an interface device and a sensor. 3. The power management method according to claim 1, wherein the control unit controls the peripherals in a polling manner. 4 . The power management method according to claim 3 , wherein a polling control cycle of the control unit for the peripheral device is determined according to a refresh frequency of the display device. 5. The power management method according to claim 4, wherein the operating time of the peripheral is a multiple of the polling control period. 6. The power management method according to any one of claims 1-5, characterized in that, the set time period is the duration of backlight insertion and black insertion. 7. The power management method according to any one of claims 1-5, wherein the display device is an intelligent display unit. 8. An electronic system, comprising a display device, a control unit and peripherals, wherein the control unit is used to detect the validity of the backlight black insertion enabling signal of the display device, and detects the backlight black insertion enabling signal. When the enable signal is valid, the currently controlled peripheral is turned off, and after a set period of time, the turned off peripheral is turned on again. 9. The electronic system according to claim 8, wherein the control unit controls the peripherals in a polling manner. 10 . The electronic system according to claim 8 , wherein the set time period is a duration of black insertion of the backlight. 11 .