CN218958612U

CN218958612U - Low-light-level solar power supply circuit

Info

Publication number: CN218958612U
Application number: CN202223373700.4U
Authority: CN
Inventors: 郑文戈
Original assignee: Wuxi Weida Intelligent Electronics Co ltd
Current assignee: Wuxi Weida Intelligent Electronics Co ltd
Priority date: 2022-12-15
Filing date: 2022-12-15
Publication date: 2023-05-02
Anticipated expiration: 2032-12-15

Abstract

The utility model belongs to the technical field of remote controller power supply, and provides a low-light solar power supply circuit, which comprises: the super capacitor is connected with the load circuit; the rapid starting capacitor is connected with the load circuit; the low-light solar panel is used for charging the rapid starting capacitor and the super capacitor; the first switch is used for controlling the connection state between the super capacitor and the low-light solar panel; the voltage detector is used for controlling the first switch according to the voltage of the super capacitor; and the second switch is used for controlling the connection state between the load circuit and the super capacitor. According to the utility model, by arranging the super capacitor, the super capacitor can be charged through the low-light solar panel, and electric energy is provided for the load circuit in a low-light or no-light scene; the quick start capacitor can be quickly charged to supply power to the load under the condition of low electric quantity of the super capacitor, so that the problems of long time consumption of super capacitor charging and slow starting of a load circuit in the early stage are solved; meanwhile, the first switch and the voltage detector are matched to avoid overcharge of the super capacitor and ensure circuit stability.

Description

Low-light-level solar power supply circuit

Technical Field

The utility model relates to the technical field of remote controller power supply, in particular to a low-light solar power supply circuit.

Background

According to the related investigation data, about 150 hundred million waste batteries are produced annually worldwide, only 2% of which can be recycled through the regular flow, and a significant part of the waste batteries come from the remote controls of most televisions and set-top boxes worldwide. Calculated with televisions commonly used in the home, assuming a television is used for about 7 years, changing the battery in the remote control only once per year means that 14 batteries will be used up and thrown away every time a television is sold. If we apply this number to 2.1 billions of global television annual sales in 2021, approximately the equivalent of 30 billions of waste batteries would be present.

In order to solve the problems of endurance limit of the remote controller caused by batteries, environmental pollution caused by battery discarding and the like, a power supply circuit is urgently needed, so that manufacturers for manufacturing the remote controller or other low-power consumption consumer electronic products can utilize the remote controller to eliminate the dependence of equipment on the batteries, and the maintenance cost of the equipment and the problems of equipment failure and equipment shutdown caused by limited battery endurance are reduced, thereby providing permanent endurance remote controllers and other low-power consumption sensors for consumers and commercial markets.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model provides a low-light solar power supply circuit to solve the problems of endurance limit and environmental pollution caused by battery power supply of the existing remote controller.

The utility model provides a low-light solar power supply circuit of a remote controller, which comprises:

the super capacitor is connected with the load circuit;

the rapid starting capacitor is connected with the load circuit;

the low-light solar panel is used for charging the rapid starting capacitor and the super capacitor;

the first switch is used for controlling the connection state between the super capacitor and the low-light solar panel;

the voltage detector is used for controlling the first switch according to the voltage of the super capacitor;

and the second switch is used for controlling the connection state between the load circuit and the super capacitor.

Optionally, the first switch is a first MOS transistor, a source electrode of the first MOS transistor is connected to the micro-light solar panel, a gate electrode of the first MOS transistor is connected to a collector electrode of a triode, and a drain electrode of the first MOS transistor is connected to a quick start capacitor.

Optionally, the second switch is a second MOS transistor, a drain electrode of the second MOS transistor is connected to the first switch, a source electrode of the second MOS transistor is connected to the super capacitor E1, and a gate electrode of the second MOS transistor is connected to the load circuit.

Optionally, the base electrode of the triode is connected with the load circuit, and the emitter electrode of the triode is connected with the output end of the voltage detector.

Optionally, the voltage detector is of the type BD4938G.

Optionally, the fast start capacitance is 470 μf tantalum capacitance.

By adopting the technical scheme, the application has the following beneficial effects:

according to the utility model, the super capacitor and the quick start capacitor are arranged, so that the super capacitor can be charged through the low-light solar panel, and electric energy is provided for a load in a low-light or no-light scene; the quick start capacitor can be quickly charged to supply power to the load under the condition of low electric quantity of the super capacitor, so that the problems that the super capacitor is long in charging time and the load circuit cannot be started in the early stage are solved; meanwhile, the first switch and the voltage detector are matched to avoid overcharge of the super capacitor and ensure circuit stability.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.

Fig. 1 shows a schematic diagram of a micro-light solar power supply circuit according to an embodiment of the present utility model;

fig. 2a shows a schematic diagram of a load circuit according to an embodiment of the present utility model;

fig. 2b shows a schematic diagram of a load circuit according to an embodiment of the present utility model.

Detailed Description

Embodiments of the technical scheme of the present utility model will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and thus are merely examples, which should not be construed as limiting the scope of the present utility model.

It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

The remote controller is widely applied to the scene that needs remote control, and most of the current remote controllers still rely on battery power supply mode at the same time, can not solve the problem of endurance, and the environmental impact caused by waste batteries is also huge. However, if solar energy is used for power supply, there are dim light or no light scenes such as night, overcast and rainy weather, and how to solve the above problems is provided.

As shown in fig. 1, the micro-light solar power supply circuit provided in this embodiment includes:

the super capacitor is connected with the load circuit;

the rapid starting capacitor is connected with the load circuit;

Specifically, the embodiment selects the 5V solar panel and the 3.8V super capacitor, so that when the super capacitor is charged by using the solar panel, an overvoltage condition that the super capacitor is still continuously charged after being full may occur. Therefore, in this embodiment, by setting a first switch, corresponding to fig. 1, the first switch is the MOS transistor Q5, when the super capacitor is full, the micro-light solar panel and the super capacitor are disconnected, once the load circuit connected to the super capacitor consumes the electric quantity of the super capacitor to reduce the voltage, the micro-light solar panel is connected to the super capacitor again, so as to continue charging.

It will be appreciated that the battery can negatively impact its lifetime, either over-charge or over-discharge, directly to the reduction in lifetime. The low-light solar panel is used as an energy source of the circuit, the super capacitor is used as energy storage equipment to continuously supply power in a low-light or no-light scene, the work of the circuit is ensured, and the service life of the circuit is not negatively influenced by overcharge and overdischarge compared with that of a battery.

In the above case, the voltage of the super capacitor E1 is obtained by providing the voltage detector U4, and when the input voltage of the 2 pin, i.e., the input pin, of the voltage detector U4 exceeds 3.8V, the output pin of the voltage detector U4 outputs a high level.

Alternatively, the voltage detector U4 is of model BD4938G.

The base of the triode Q6 is connected with a load circuit, and the emitter of the triode Q6 is connected with the output end of the voltage detector U4. After the voltage detector U4 outputs high level, the triode Q6 is cut off, so that the MOS tube Q5 is cut off, and the connection between the low-light solar panel and the super capacitor E1 is disconnected.

In this embodiment, the super capacitor is used to make use of the characteristic that the capacity of the super capacitor is large, but due to the characteristic of the super capacitor, when the product is used for the first time or when the load circuit is reused after stopping working, if the ambient light is not strong, the starting is very slow, because the super capacitor needs a long time to enable the circuit to work, and there are situations that the strong enough light intensity cannot be achieved in cloudy days, rainy days, and the like when no sun exists. Based on this, in this embodiment, by adding a quick start capacitor to the circuit, the quick start capacitor needs to be able to be quickly charged to enable the load circuit to start to work, so as to implement quick start.

In one possible implementation, the fast start capacitor uses a 470 μf patch tantalum capacitor. Due to the material and capacity of the tantalum capacitor, the tantalum capacitor can meet the requirement of quick starting of a load circuit.

As shown in fig. 1, the quick start capacitor E2 is connected to the micro-light solar panel through diodes D4 and D5, so that the micro-light solar panel continuously charges the quick start capacitor E2. It should be noted that, in this embodiment, the tantalum capacitor is 6.3V, and the micro-light solar panel is 5V, so there is no risk of overvoltage. However, for other different voltage conditions, the switch can be set to avoid the problem of overcharging.

As shown in fig. 1, a source electrode of the first switch Q5 is connected to the micro-light solar panel through a diode D4, a gate electrode of the first switch Q5 is connected to a collector electrode of a triode Q6, and a drain electrode of the first switch Q5 is connected to a quick start capacitor E2 through diodes D7 and D6. The emitter of transistor Q6 is connected to the output pin of voltage detector U4. The input pin of the voltage detector U4 acquires the voltage value of the super capacitor E1, when the voltage detector U4 detects that the voltage of the super capacitor is the rated voltage of the super capacitor, the triode Q6 is cut off, the MOS tube Q5 is cut off, and the connection between the low-light-level solar panel and the super capacitor is disconnected.

Optionally, in the micro-light solar power supply circuit provided in this embodiment, when the voltage of the gate electrode of the second switch Q7, that is, the obtained voltage of the load circuit is smaller than the minimum working voltage of the load circuit, the second switch Q7 is turned off, that is, the connection between the super capacitor E1 and the load circuit is disconnected.

In the actual use process, the condition of no illumination can appear, when the power supply voltage falls below the lowest voltage of the work of the load circuit, the load circuit can not work normally, but the super capacitor is also connected with the load circuit to keep electricity consumption. In order to avoid overdischarge of the supercapacitor, the present embodiment is configured to solve the above-mentioned problem by providing a second switch, i.e. to implement low-voltage protection.

As shown in fig. 1, the drain of the second switch Q7 is connected to the drain of the first switch Q5, the source of the second switch Q7 is connected to the supercapacitor E1, and the source of the second switch Q7 is connected to the control_io of the load circuit. When control_IO is high level, super capacitor E1 supplies power normally, and when control_IO is low level, super capacitor E1 is disconnected from the load circuit.

In one possible embodiment, the load circuit comprises an MCU unit, and control_io may be a Control IO of the BLE MCU.

In a specific load circuit shown in fig. 2a, the MCU unit is specifically designated as WNF173, and the operating voltage of the load circuit is 1.8V-3.3V, so that the minimum operating voltage of the load circuit is 1.8V. Meanwhile, in order to solve the voltage difference of the super capacitor, the quick start capacitor and the load circuit, a voltage stabilizing chip U2 is further connected between the super capacitor and the quick start capacitor and between the super capacitor and the load circuit, so that the output voltage of the super capacitor and the quick start capacitor meets the requirement of the load circuit. Meanwhile, the load circuit further includes other specific functional modules, as shown in fig. 2b, which will not be described in detail below.

Through increasing second switch, namely second MOS pipe Q7, can make super capacitor E1 electric quantity not have not just satisfied under the condition that load circuit work can not reduce too much, can be in the faster electric quantity of storing of next time illumination arrival for the circuit is faster stable.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples represent only a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the utility model. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims

1. A micro-optic solar power supply circuit, comprising:

the super capacitor is connected with the load circuit;

the rapid starting capacitor is connected with the load circuit;

2. The micro-light solar power supply circuit according to claim 1, wherein the first switch is a first MOS transistor, a source electrode of the first MOS transistor is connected to the micro-light solar panel, a gate electrode of the first MOS transistor is connected to a collector electrode of a triode, and a drain electrode of the first MOS transistor is connected to a quick start capacitor.

3. The micro-light solar power supply circuit according to claim 2, wherein the second switch is a second MOS transistor, a drain electrode of the second MOS transistor is connected to the first switch, a source electrode of the second MOS transistor is connected to the super capacitor E1, and a gate electrode of the second MOS transistor is connected to the load circuit.

4. The micro-optic solar power supply circuit according to claim 2, wherein the base of the triode is connected to the load circuit, and the emitter of the triode is connected to the output of the voltage detector.

5. The micro-optic solar power supply circuit according to claim 1, wherein the voltage detector is of the type BD4938G.

6. The micro-optic solar power supply circuit according to claim 1, wherein the fast start-up capacitance is 470 μf tantalum capacitance.