Power management system

Abstract

The invention provides a power management system, and the system comprises a constant voltage management module electrically connected with an output end of a power supply; an electrical energy storage management module which is electrically connected to the power supply and the constant voltage management module and is used for storing a supply current when a load is in a sleep state, and supplying the current to the load when the load is wakened up to work; a load start and power management module which is disposed between the constant voltage management module and the load. The system can start a load circuit as soon as possible under the condition of extremely low current power supply, stores the extremely low supply current when the load circuit in a sleep state so that the load circuit can use the current to work after waking up. After the load circuit enters the sleep state, the power supply current continues to be stored until the electrical storage device is fully charged. Inthe process of storing electricity, when a post-level circuit wakes up and needs current consumption after work, the load circuit is preferentially supplied with power. After the load circuit unexpectedly works to pull down the power supply, the system has self-recovery capability.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a power management system. Background technique [0002] As more and more electronic components such as MCUs and sensors have low power consumption and sleep functions, more and more circuit products based on the design of various electronic components such as MCUs and sensors are used in low-power applications. MCU and sensors also have a large number of applications in the control panel of the smart home control system and various detectors and sensor products, please refer to figure 1 , and its working mode is "start-sleep-work", but the long-lasting power supply of MCU and sensors has always been a serious problem: if battery power is used, due to the limited power of the battery, the battery of the device installed on the wall or ceiling Replacement is more complicated. [0003] Existing electronic products are powered by solar cells to avoid the above-mentione...

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Problems solved by technology

[0002] As more and more electronic components such as MCUs and sensors have low power consumption and sleep functions, more and more circuit products based on the design of various electronic components such as MCUs and sensors are used in low-power applications. MCU and sensors also have a large number of applications in the control panel of the smart home control system and various detectors and sensor products, please refer to figure 1 , and its working mode is "start-sleep-work", but the long-lasting power supply of MCU and sensors has always been a serious problem: if battery power is used, due to the limited power of the battery, the battery of the device installed on the wall or ceiling Replacement is more cumbersome

[0003] Existing electronic products are powered by solar cells to avoid the above-mentioned problems caused by battery replacement. However, due to the low photoelectric efficiency of the solar cell itself and the constraints of low indoor light intensity, the current generated by the solar cell is generally very small, ranging from a few uA Up to tens of uA, or hundreds of uA, although using more photovoltaic cells can increase the current output capability, but the use of large-area photovoltaic cells will lead to a larger area or volume of the designed product, which will affect the appearance

[0004] Therefore, it is difficult to use the power output by a solar panel of an appropriate size to supply power to the load circuit, and another thorny problem will be encountered: as mentioned above, the current capability of the output of a general solar cell How to use this extremely low current to start the MCU-based load circuit in the subsequent stage is also a very tricky thing, because the MCU generally requires a current of more than ten mA or even higher to start.

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