CN214755671U - Solar charging circuit and electronic equipment - Google Patents

Abstract

The utility model provides a solar charging circuit and electronic equipment relates to the power supply technology field. The first capacitor in the solar charging circuit is charged by utilizing electric energy provided by the solar input module, the starting control module controls the first capacitor to be communicated with the main control chip by detecting the output voltage of the first capacitor under the condition that the output voltage of the first capacitor reaches the starting threshold value of the main control chip, and the main control chip is started according to the output voltage of the first capacitor at the moment. Because be provided with the start control module between first electric capacity and the main control chip, when first electric capacity charges and output voltage is lower, can be cut off by start control module between first electric capacity and the main control chip for the output voltage of first electric capacity can reach the start threshold fast, after the output voltage of first electric capacity reached the start threshold, start control module control first electric capacity and main control chip intercommunication, not only guaranteed the normal start of main control chip, still improved the start-up speed.

Description

Solar charging circuit and electronic equipment

Technical Field

The utility model relates to a power supply technical field particularly, relates to a solar charging circuit and electronic equipment.

Background

With the rapid development of smart homes and smart buildings, a large number of industrial parks and buildings begin to deploy automated intelligent equipment on a large scale. In a home scene, due to the fact that the number of the devices is small, battery replacement operation can be easily carried out, and even iterative upgrade of products can be directly carried out; however, in a large-scale deployment scenario, devices generally need to be installed and maintained in a centralized manner, and when more devices are used up in a centralized manner and are installed at positions which are not easy to contact, great troubles are brought to later-stage maintenance of the devices, so that a maintenance-free self-powered technology (for example, technologies of solar energy, wind energy, water energy, wireless power transmission and the like) is a good choice.

At present, in environments such as parks and buildings, the equipment deployed on a large scale can bring great convenience to later maintenance by adopting solar power supply. The solar power supply mainly comprises the following two schemes, one scheme is that a solar battery is directly connected to equipment for energy collection, the efficiency is low, the solar battery can only be used for simple illumination and other applications under normal conditions, for equipment containing a master control such as an MCU (micro controller Unit), the equipment can be normally started only when the starting voltage meets certain requirements, and in the direct energy collection mode, the voltage is slowly raised, and the master control cannot be normally started; another is to harvest energy by dedicated chips, which are highly efficient but expensive, which is a significant obstacle in large-scale device deployment.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a solar charging circuit and electronic equipment can effectively guarantee main control chip's normal start.

The utility model provides a technical scheme:

in a first aspect, the utility model provides a solar charging circuit, which comprises a first capacitor, a start control module and a main control chip, wherein the first capacitor, the start control module and the main control chip are electrically connected in sequence;

the first capacitor is used for charging by utilizing electric energy provided by the solar energy input module;

the starting control module is used for detecting the output voltage of the first capacitor and controlling the first capacitor to be communicated with the main control chip under the condition that the output voltage of the first capacitor reaches the starting threshold value of the main control chip;

the main control chip is used for starting according to the output voltage of the first capacitor.

In an optional implementation manner, the start control module includes a first voltage detection chip and a first switch unit, one end of the first voltage detection chip is electrically connected to the first capacitor, the other end of the first voltage detection chip is electrically connected to the control end of the first switch unit, the input end of the first switch unit is electrically connected to the first capacitor, and the output end of the first switch unit is electrically connected to the main control chip.

In an optional embodiment, the first switching unit includes a first switching tube, a second switching tube and a first resistor, a gate of the first switching tube is electrically connected to the first voltage detection chip, a source of the first switching tube is grounded, and a drain of the first switching tube is electrically connected to a gate of the second switching tube;

the source electrode of the second switch tube is electrically connected with the first capacitor, the drain electrode of the second switch tube is electrically connected with the main control chip, one end of the first resistor is electrically connected between the first capacitor and the source electrode of the second switch tube, and the other end of the first resistor is electrically connected with the grid electrode of the second switch tube.

In an optional embodiment, the solar charging circuit further includes a second capacitor and a charging control module, the second capacitor is electrically connected to the charging control module, and one end of the charging control module is electrically connected between the start control module and the main control chip; the capacity of the second capacitor is larger than that of the first capacitor;

the charging control module is used for controlling the solar energy input module to be communicated with the second capacitor according to the output voltage of the first capacitor after the main control chip is started, and charging the second capacitor through the solar energy input module; or the solar input module is controlled to be disconnected from the second capacitor, and the second capacitor is stopped to be charged through the solar input module.

In an optional embodiment, the charging control module includes a second voltage detection chip, a second switch unit, and a third switch unit, one end of the second voltage detection chip is electrically connected between the start control module and the main control chip, and the other end of the second voltage detection chip is electrically connected to both a control end of the second switch unit and a control end of the third switch unit;

the input end of the second switch unit is electrically connected with the solar input module, the output end of the second switch unit is electrically connected with the input end of the third switch unit, and the output end of the third switch unit is electrically connected with the second capacitor.

In an optional embodiment, the second switching unit comprises a third switching tube, a fourth switching tube and a second resistor, wherein the base of the third switching tube is electrically connected with the second voltage detection chip, the collector of the third switching tube is electrically connected with the gate of the fourth switching tube, and the emitter of the third switching tube is grounded;

the source electrode of the fourth switch tube is electrically connected with the solar input module, the drain electrode of the fourth switch tube is electrically connected with the input end of the third switch unit, one end of the second resistor is electrically connected between the solar input module and the source electrode of the fourth switch tube, and the other end of the second resistor is electrically connected between the grid electrode of the fourth switch tube and the collector electrode of the third switch tube.

In an optional embodiment, the third switching unit includes a fifth switching tube, a sixth switching tube and a third resistor, a base of the fifth switching tube is electrically connected to the second voltage detection chip, a collector of the fifth switching tube is electrically connected to a gate of the sixth switching tube, and an emitter of the fifth switching tube is grounded;

the source electrode of the sixth switching tube is electrically connected with the second switching unit, the drain electrode of the sixth switching tube is electrically connected with the second capacitor, one end of the third resistor is electrically connected between the grid electrode of the sixth switching tube and the collector electrode of the fifth switching tube, and the other end of the third resistor is electrically connected between the drain electrode of the sixth switching tube and the second capacitor.

In an optional embodiment, the third switching unit further includes a first voltage-dividing resistor and a second voltage-dividing resistor, the first voltage-dividing resistor and the second voltage-dividing resistor are connected in series between the source of the sixth switching tube and ground, and the base of the fifth switching tube is electrically connected between the first voltage-dividing resistor and the second voltage-dividing resistor.

In an optional embodiment, the solar charging circuit further includes a holding circuit, one end of the holding circuit is electrically connected to the start control module, and the other end of the holding circuit is electrically connected between the start control module and the main control chip;

the holding circuit is used for controlling the first capacitor to be in a communication state with the main control chip after the main control chip is started and under the condition that the output voltage of the first capacitor is smaller than the starting threshold value.

In a second aspect, the present invention provides an electronic device, comprising the solar charging circuit of any one of the previous embodiments.

The utility model provides an among solar charging circuit and the electronic equipment, this solar charging circuit includes first electric capacity, start control module and main control chip, and first electric capacity, start control module and main control chip electricity are connected in proper order. The first capacitor is charged by electric energy provided by the solar input module, the starting control module controls the first capacitor to be communicated with the main control chip by detecting the output voltage of the first capacitor under the condition that the output voltage of the first capacitor reaches the starting threshold value of the main control chip, and the main control chip is started according to the output voltage of the first capacitor at the moment. Because be provided with the start control module between first electric capacity and the main control chip, when first electric capacity charges and output voltage is lower, can be cut off by start control module between first electric capacity and the main control chip for the output voltage of first electric capacity can reach the start threshold fast, after the output voltage of first electric capacity reached the start threshold, start control module control first electric capacity and main control chip intercommunication, not only guaranteed the normal start of main control chip, still improved the start-up speed.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a block diagram of a solar charging circuit according to an embodiment of the present invention;

fig. 2 is another structural block diagram of a solar charging circuit according to an embodiment of the present invention;

fig. 3 is a block diagram of another structure of a solar charging circuit according to an embodiment of the present invention;

fig. 4 is a block diagram of another structure of a solar charging circuit according to an embodiment of the present invention;

fig. 5 is a block diagram of another structure of a solar charging circuit according to an embodiment of the present invention;

fig. 6 is a schematic circuit diagram of a solar charging circuit according to an embodiment of the present invention.

Icon: 100-solar charging circuit; 110-a solar energy input module; 120-a first capacitance; 130-start control module; 140-a master control chip; 150-a holding circuit; 160-a charging control module; 170-a second capacitance; 131-a first voltage detection chip; 132-a first switching unit; 161-a second switching unit; 162-a third switching unit; 163-second voltage detection chip.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it is to be understood that the terms "first", "second", "third", and the like are used merely for distinguishing between descriptions and are not to be construed as indicating or implying relative importance. It should also be noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may for example be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1, the present embodiment provides a solar charging circuit 100, where the solar charging circuit 100 may be applied to electronic devices such as intelligent household electrical appliances, sensing devices, and detection devices, for example, an intelligent refrigerator, a pressure sensor, a smoke sensor, a body sensor, a door and window sensor, and especially in scenes such as buildings and parks where sensors are deployed on a large scale, the trouble of post-maintenance of the devices can be effectively reduced.

As shown in fig. 1, the solar charging circuit 100 includes a first capacitor 120, a start control module 130, and a main control chip 140, and the first capacitor 120, the start control module 130, and the main control chip 140 are electrically connected in sequence.

The first capacitor 120 can be electrically connected to a solar input module 110, and is used for charging by using the electric energy provided by the solar input module 110; the start control module 130 is configured to detect an output voltage of the first capacitor 120, and control the first capacitor 120 to communicate with the main control chip 140 when the output voltage of the first capacitor 120 reaches a start threshold of the main control chip 140, where the main control chip 140 is configured to start according to the output voltage of the first capacitor 120.

In this embodiment, the solar input module 110 may be a solar cell, a solar panel, or the like, and is used for providing power to the solar charging circuit 100. When the electronic device is taken out for the first time, there is usually no energy, and at this time, the first capacitor 120 is charged by the electric energy provided by the solar energy input module 110 in the electronic device, so that the output voltage of the first capacitor 120 reaches the start threshold of the main control chip 140, that is, the system start voltage of the electronic device is satisfied. The main control chip 140 usually has requirements for a start voltage and a start timing sequence, which is mainly implemented by the start control module 130 in this embodiment, when the output voltage of the first capacitor 120 reaches the start threshold of the main control chip 140, the start control module 130 will open the power supply path of the main control chip 140, so that the first capacitor 120 is communicated with the main control chip 140, and then the main control chip 140 is started by the output voltage of the first capacitor 120, so that the system of the electronic device operates normally.

It can be seen that, the utility model provides a solar charging circuit 100, because be provided with start control module 130 between first electric capacity 120 and the main control chip 140, charge and output voltage when lower at first electric capacity 120, can be cut off by start control module 130 between first electric capacity 120 and the main control chip 140, first electric capacity 120 just can not be consumed the electric energy when charging like this, make first electric capacity 120's output voltage can reach the start threshold value fast, after first electric capacity 120's output voltage reached the start threshold value, start control module 130 and control first electric capacity 120 and main control chip 140 intercommunication, not only guaranteed main control chip 140's normal start, start speed has still been improved.

It should be noted that, in practical applications, in order to shorten the start-up time of the main control chip 140, a capacitor with a relatively small capacity (short-term capacitor) may be selected as the first capacitor 120, for example, a capacitor with a capacity of 470 μ F may be selected as the first capacitor 120. By selecting the capacitor with small capacity as the first capacitor 120, the electronic device only needs a short time from no energy to normal operation of the system, the starting speed is high, and the user experience is enhanced.

Referring to fig. 2, the start control module 130 may include a first voltage detection chip 131 and a first switch unit 132, wherein one end of the first voltage detection chip 131 is electrically connected to the first capacitor 120, the other end of the first voltage detection chip 131 is electrically connected to a control end of the first switch unit 132, an input end of the first switch unit 132 is electrically connected to the first capacitor 120, and an output end of the first switch unit 132 is electrically connected to the main control chip 140. Wherein, the input terminal and the output terminal of the first switch unit 132 constitute a power supply path of the main control chip 140.

In this embodiment, the first voltage detecting chip 131 has a corresponding first reset threshold voltage, and it is configured that when the output voltage of the first capacitor 120 reaches the start threshold of the main control chip 140, the voltage of the end of the first voltage detecting chip 131 connected to the first capacitor 120 reaches the first reset threshold voltage. In the process that the solar input module 110 charges the first capacitor 120, the first voltage detection chip 131 may detect whether the voltage at the end connected to the first capacitor 120 reaches a first reset threshold voltage, and when the voltage does not reach the first reset threshold voltage, the input end and the output end of the first switch unit 132 are not connected, and the power supply path of the main control chip 140 is in an off state; when the first reset threshold voltage is reached, the first voltage detection chip 131 outputs a control signal to the control terminal of the first switch unit 132 to control the input terminal and the output terminal of the first switch unit 132 to be connected, so as to open the power supply path of the main control chip 140, and at this time, the output voltage of the first capacitor 120 can supply power to the main control chip 140, thereby ensuring that the main control chip 140 is normally started.

In this embodiment, since the start control module 130 controls the first capacitor 120 to be connected to the main control chip 140 only when the output voltage of the first capacitor 120 reaches the start threshold of the main control chip 140, after the electronic device normally operates, if the energy output by the solar input module 110 is low, the output voltage of the first capacitor 120 is lower than the start threshold, at this time, the start control module 130 controls the first capacitor 120 to be disconnected from the main control chip 140, and the first capacitor 120 is no longer connected to the main control chip 140, so that the normal operation of the main control chip 140 is affected. Based on this, referring to fig. 3, the solar charging circuit 100 may further include a holding circuit 150, one end of the holding circuit 150 is electrically connected to the start control module 130, and the other end of the holding circuit 150 is electrically connected between the start control module 130 and the main control chip 140.

The holding circuit 150 is configured to control the first capacitor 120 and the main control chip 140 to maintain a connected state after the main control chip 140 is started and the output voltage of the first capacitor 120 is smaller than a start threshold.

In this embodiment, after the main control chip 140 is started according to the output voltage of the first capacitor 120, the main control chip 140 operates normally; if the energy output by the solar input module 110 is reduced at a certain time, which results in that the output voltage of the first capacitor 120 is lower than the start threshold (3.6V), the start control module 130 will control the first capacitor 120 to be disconnected from the main control chip 140, at this time, a pre-set voltage exists between the start control module 130 and the main control chip 140, the holding circuit 150 outputs a control signal to the start control module 130 based on the pre-set voltage, and then the start control module 130 controls the first capacitor 120 and the main control chip 140 to be kept in a connected state. In this way, after the main control chip 140 is started, even if the output voltage of the first capacitor 120 is lower than the start threshold, the first capacitor 120 can still supply power to the main control chip 140, thereby ensuring the normal operation of the main control chip 140.

In this embodiment, considering that when the output voltage of the first capacitor 120 is too low, the current on the devices such as the main control chip 140 may increase, thereby increasing the loss, and the first capacitor 120 may be damaged due to undervoltage, a shutdown threshold may be set for the output voltage of the first capacitor 120, and the holding circuit 150 controls the first capacitor 120 and the main control chip 140 to maintain a connected state after the main control chip 140 is started and under the condition that the output voltage of the first capacitor 120 is greater than the shutdown threshold and smaller than the startup threshold; when the output voltage of the first capacitor 120 is smaller than the turn-off threshold, the first capacitor 120 and the main control chip 140 are disconnected to reduce loss, and simultaneously, the under-voltage protection of the first capacitor 120 is realized, so that the first capacitor 120 is prevented from being damaged due to under-voltage. For example, a shut-off threshold of 2.7V and a start-up threshold of 3.6V may be set.

In this embodiment, after the electronic device is normally operated, the electronic device may enter a low power consumption mode, and if the energy output by the solar energy input module 110 is enough for the system to operate, and there is excess energy, the excess energy may be charged for storage. Based on this, referring to fig. 4, the solar charging circuit 100 may further include a second capacitor 170 and a charging control module 160, the second capacitor 170 is electrically connected to the charging control module 160, the charging control module 160 is further electrically connected to the solar input module 110, and one end of the charging control module 160 is electrically connected between the start control module 130 and the main control chip 140. Wherein, the capacity of the second capacitor 170 is larger than that of the first capacitor 120.

The charging control module 160 is configured to control the solar input module 110 to communicate with the second capacitor 170 according to the output voltage of the first capacitor 120 after the main control chip 140 is started, and charge the second capacitor 170 through the solar input module 110; or, the solar input module 110 is controlled to be disconnected from the second capacitor 170, and the second capacitor 170 is stopped being charged through the solar input module 110.

In this embodiment, after the main control chip 140 is started, the electronic device operates normally, and the charging control module 160 detects the voltage provided by the first capacitor 120 to the main control chip 140 (i.e. the output voltage of the first capacitor 120) to determine whether there is excess energy in the energy output by the solar energy input module 110. Under the condition of redundant energy, the solar energy input module 110 is controlled to be communicated with the second capacitor 170, so that the solar energy input module 110 charges the second capacitor 170, and the redundant energy can be charged into the second capacitor 170 to be stored under the condition that the energy output by the solar energy input module 110 meets the requirement of system operation; if the energy output by the solar energy input module 110 is less, the solar energy input module 110 is controlled to be disconnected from the second capacitor 170, so that the solar energy input module 110 stops charging the second capacitor 170.

It should be noted that, since the second capacitor 170 is mainly used for storing the excess energy output by the solar energy input module 110, a capacitor (super capacitor) with a larger capacity may be selected as the second capacitor 170. In the embodiment, the capacity of the second capacitor 170 is much larger than that of the first capacitor 120, for example, the capacity of the second capacitor 170 may be 1.5F.

It can be seen that, the utility model provides a solar charging circuit 100, through setting up second electric capacity 170 and charging control module 160, and detect the voltage that first electric capacity 120 provided main control chip 140 by charging control module 160, and then judge whether the energy of solar energy input module 110 output satisfies the system operation, the energy of solar energy input module 110 output is satisfying under the condition of system operation, through controlling solar energy input module 110 and second electric capacity 170 intercommunication, can fill unnecessary energy into second electric capacity 170 and save, in order to supply follow-up use.

Referring to fig. 5, the charging control module 160 may include a second voltage detection chip 163, a second switch unit 161, and a third switch unit 162, wherein one end of the second voltage detection chip 163 is electrically connected between the start control module 130 and the main control chip 140, and the other end of the second voltage detection chip 163 is electrically connected to both a control end of the second switch unit 161 and a control end of the third switch unit 162. An input end of the second switching unit 161 is electrically connected to the solar input module 110, an output end of the second switching unit 161 is electrically connected to an input end of the third switching unit 162, and an output end of the third switching unit 162 is electrically connected to the second capacitor 170.

In this embodiment, the second voltage detecting chip 163 has a corresponding second reset threshold voltage, when the main control chip 140 is started, the solar input module 110 continues to charge the first capacitor 120, the output voltage of the first capacitor 120 gradually increases, when the output voltage of the first capacitor 120 increases to a certain threshold, it indicates that there is excess energy in the current solar input module 110, the voltage of the end of the second voltage detecting chip 163 connected to the start control module 130 will reach the second reset threshold voltage, the second voltage detecting chip 163 outputs a control signal to the control ends of the second switch unit 161 and the third switch unit 162 to control the input end and the output end of the second switch unit 161 to be connected, and to control the input end and the output end of the third switch unit 162 to be connected, at this time, the solar input module 110 charges the first capacitor 120 and also charges the second capacitor 170, the second capacitor 170 stores the excess energy. When the energy of the solar input module 110 is insufficient, the voltage of the end of the second voltage detecting chip 163 connected to the start control module 130 is lower than the second reset threshold voltage, and at this time, the input end and the output end of the second switching unit 161 and the input end and the output end of the third switching unit 162 are both in an off state, and the solar input module 110 stops charging the second capacitor 170.

It should be noted that, in practical applications, the main control chip 140 may also be electrically connected to both the solar input module 110 and the second capacitor 170, and after the main control chip 140 is started, the first capacitor 120, the solar input module 110, and the second capacitor 170 jointly supply power to the main control chip 140. The main control chip 140 can realize the overvoltage protection for the first capacitor 120 and the second capacitor 170 by monitoring the voltage conditions on the first capacitor 120 and the second capacitor 170. For example, when the voltage on the first capacitor 120 or the second capacitor 170 is detected to be higher than the set overvoltage threshold, messages can be sent to the gateway to consume more energy, and the interval for sending the messages can be dynamically adjusted according to the charging speed. Specifically, the faster the charging speed, the faster the message transmission.

Next, the circuit structure of each module unit of the solar charging circuit 100 provided in this embodiment will be described in detail. Referring to fig. 6, the first switch unit 132 includes a first switch transistor Q3A, a second switch transistor Q3B, and a first resistor R1, wherein the first switch transistor Q3A may be an NMOS transistor, and the second switch transistor Q3B may be a PMOS transistor. The gate of the first switch tube Q3A is electrically connected to the first voltage detecting chip 131, the source of the first switch tube Q3A is grounded, and the drain of the first switch tube Q3A is electrically connected to the gate of the second switch tube Q3B. The source of the second switch Q3B is electrically connected to the first capacitor 120, the drain of the second switch Q3B is electrically connected to the main control chip 140, one end of the first resistor R1 is electrically connected between the first capacitor 120 and the source of the second switch Q3B, and the other end of the first resistor R1 is electrically connected to the gate of the second switch Q3B. Here, the gate of the first switch Q3A may be understood as the control terminal of the first switch unit 132, the source of the second switch Q3B may be understood as the input terminal of the first switch unit 132, and the drain of the second switch Q3B may be understood as the output terminal of the first switch unit 132.

Specifically, the first voltage detection chip 131 includes a power terminal VCC and a reset terminal

And a ground terminal GND, the first capacitor 120 is electrically connected to the power terminal VCC of the first voltage detection chip 131 through the second diode D2, the third diode D3, and the fourth resistor R8, and the third capacitor C3 is electrically connected between the power terminal VCC of the first voltage detection chip 131 and ground. The gate of the first switching transistor Q3A and the reset terminal of the first voltage detecting chip 131

And the source of the first switch tube Q3A is electrically connected to the ground through the fifth resistor R9.

Taking the first reset threshold voltage of the first voltage detection chip 131 as 2.93V as an example, when the voltage of the power source terminal VCC of the first voltage detection chip 131 is lower than 2.93V during the process of charging the first capacitor 120 by the solar input module 110, the reset terminal of the first voltage detection chip 131

Outputting a low level signal, wherein the first switch tube Q3A and the second switch tube Q3B are both in an off state; with the increasing output voltage of the first capacitor 120, the second capacitorThe voltage of the power source terminal VCC of the voltage detection chip 131 will reach 2.93V (the output voltage of the first capacitor 120 reaches the start threshold of the main control chip 140), and at this time, the reset terminal of the first voltage detection chip 131

The first switch tube Q3A is turned on under the control of the high level signal, a voltage difference is formed between the gate and the source of the second switch tube Q3B, so that the second switch tube Q3B is turned on, the first capacitor 120 is communicated with the main control chip 140, and the output voltage (VCC _ SOLAR) of the first capacitor 120 supplies power to the main control chip 140, so that the main control chip 140 operates normally.

In this embodiment, the holding circuit 150 may include a seventh switch Q6, a third voltage dividing resistor R6, and a fourth voltage dividing resistor R7, wherein the seventh switch Q6 may be a triode. The third voltage dividing resistor R6 and the fourth voltage dividing resistor R7 are connected in series between the drain of the second switch Q3B and the ground, the base of the seventh switch Q6 is electrically connected between the third voltage dividing resistor R6 and the fourth voltage dividing resistor R7, the collector of the seventh switch Q6 is electrically connected to the gate of the second switch Q3B, and the emitter of the seventh switch Q6 is connected to the ground through the sixth resistor R10.

After the main control chip 140 is normally started, if the output voltage of the first capacitor 120 is smaller than the start threshold of the main control chip 140, the first switch Q3A and the second switch Q3B both change from the on state to the off state, and after the pre-voltage generated at the drain of the second switch Q3B is divided by the voltage dividing circuit formed by the third voltage dividing resistor R6 and the fourth voltage dividing resistor R7, the seventh switch Q6 is controlled to be turned on, and the second switch Q3B is also turned on, so that the first capacitor 120 can still supply power to the main control chip 140 under the condition that the output voltage of the first capacitor 120 is smaller than the start threshold of the main control chip 140. When the output voltage of the first capacitor 120 is continuously decreased (for example, smaller than the turn-off threshold), the voltage output by the voltage dividing circuit formed by the third voltage dividing resistor R6 and the fourth voltage dividing resistor R7 cannot be continuously turned on the seventh switching tube Q6, and then the seventh switching tube Q6 and the second switching tube Q3B are both turned off, and the first capacitor 120 and the main control chip 140 are turned off, so as to reduce the loss, and simultaneously implement the under-voltage protection for the first capacitor 120, so that the voltage of the first capacitor 120 is kept within the normal working voltage range, and cannot be damaged due to under-voltage.

In this embodiment, the second switching unit 161 includes a third switching tube Q2A, a fourth switching tube Q1A and a second resistor R2, the base of the third switching tube Q2A is electrically connected to the second voltage detecting chip 163, the collector of the third switching tube Q2A is electrically connected to the gate of the fourth switching tube Q1A, and the emitter of the third switching tube Q2A is grounded. The source of the fourth switching tube Q1A is electrically connected to the solar input module 110, the drain of the fourth switching tube Q1A is electrically connected to the input end of the third switching unit 162, one end of the second resistor R2 is electrically connected between the solar input module 110 and the source of the fourth switching tube Q1A, and the other end of the second resistor R2 is electrically connected between the gate of the fourth switching tube Q1A and the collector of the third switching tube Q2A. The base of the third switching transistor Q2A may be understood as the control terminal of the second switching unit 161, the source of the fourth switching transistor Q1A may be understood as the input terminal of the second switching unit 161, and the drain of the fourth switching transistor Q1A may be understood as the output terminal of the second switching unit 161.

The third switching unit 162 includes a fifth switching tube Q2B, a sixth switching tube Q1B, and a third resistor R3, wherein the base of the fifth switching tube Q2B is electrically connected to the second voltage detecting chip 163, the collector of the fifth switching tube Q2B is electrically connected to the gate of the sixth switching tube Q1B, and the emitter of the fifth switching tube Q2B is grounded. The source of the sixth switching tube Q1B is electrically connected to the second switching unit 161, the drain of the sixth switching tube Q1B is electrically connected to the second capacitor 170, one end of the third resistor R3 is electrically connected between the gate of the sixth switching tube Q1B and the collector of the fifth switching tube Q2B, and the other end of the third resistor R3 is electrically connected between the drain of the sixth switching tube Q1B and the second capacitor 170. The base of the fifth switch Q2B may be understood as the control terminal of the third switch unit 162, the source of the sixth switch Q1B may be understood as the input terminal of the third switch unit 162, and the drain of the sixth switch Q1B may be understood as the output terminal of the third switch unit 162.

Specifically, the second voltage detection chip 163 comprises a power supply terminal VCC and a reset terminal

And a ground terminal GND, a drain of the second switching transistor Q3B is electrically connected to the power terminal VCC of the second voltage detecting chip 163, the fourth diode D4 and the seventh resistor R11 are connected in series between the drain of the second switching transistor Q3B and the power terminal VCC of the second voltage detecting chip 163, one end of the fourth capacitor C4 is electrically connected between the power terminal VCC of the second voltage detecting chip 163 and the seventh resistor R11, and the other end of the fourth capacitor C4 is grounded.

Reset terminal of the second voltage detecting chip 163

A eighth resistor R12 electrically connected to the reset terminal of the second voltage detecting chip 163 and electrically connected to the base of the third switching tube Q2A and the base of the fifth switching tube Q2B

One end of a fifth capacitor C5 and one end of a ninth resistor R13 are electrically connected between the base of the third switch tube Q2A and the base of the eighth resistor R12 and the base of the third switch tube Q2A, and the other end of the fifth capacitor C5 and the other end of the ninth resistor R13 are grounded; the emitter of the third switching tube Q2A is grounded through a tenth resistor R14; an eleventh resistor R15 is electrically connected to the reset terminal of the second voltage detecting chip 163

And the emitter of the fifth switch tube Q2B is grounded through a twelfth resistor R16 between the base of the fifth switch tube Q2B.

A first pin 1 of the solar input module 110 is electrically connected with a source of the fourth switching tube Q1A through a first inductor L1, a second pin 2 of the solar input module 110 is grounded through a second inductor L2, an anode of a seventh diode D7 is electrically connected between the first inductor L1 and a source of the fourth switching tube Q1A, and a cathode of the seventh diode D7 is electrically connected with the first capacitor 120; an anode of the sixth diode D6 is electrically connected to the drain of the fourth switch Q1A, a cathode of the sixth diode D6 is electrically connected to the source of the sixth switch Q1B, an anode of the fifth diode D5 is electrically connected between the cathode of the sixth diode D6 and the source of the sixth switch Q1B, and a cathode of the fifth diode D5 is electrically connected between the cathode of the seventh diode D7 and the first capacitor 120.

Taking the second reset threshold voltage of the second voltage detecting chip 163 as 2.63V as an example, after the main control chip 140 is normally started, the second voltage detecting chip 163 can detect the voltage of the power terminal VCC thereof in real time, and under the condition that the voltage of the power terminal VCC of the second voltage detecting chip 163 reaches 2.63V, the reset terminal of the second voltage detecting chip 163

The high-level signal Charge _ EN is output, the third switching tube Q2A and the fifth switching tube Q2B are turned on under the control of the high-level signal Charge _ EN, so that a voltage difference is formed between the gate and the source of the fourth switching tube Q1A, a voltage difference is formed between the gate and the drain of the sixth switching tube Q1B, the fourth switching tube Q1A and the sixth switching tube Q1B are both turned on, at this time, lines between the solar input module 110 and the second capacitor 170 are communicated, and the solar input module 110 can Charge redundant energy into the second capacitor 170 to be stored. When the energy output by the solar input module 110 is low, which causes the voltage of the power terminal VCC of the second voltage detecting chip 163 to be lower than 2.63V, the third switching tube Q2A and the fifth switching tube Q2B change from the on state to the off state, the fourth switching tube Q1A and the sixth switching tube Q1B are also turned off, the line between the solar input module 110 and the second capacitor 170 is disconnected, and the solar input module 110 stops charging the second capacitor 170.

Optionally, in this embodiment, in order to implement an under-voltage protection on the second capacitor 170 to avoid the second capacitor 170 from being damaged due to under-voltage, the third switching unit 162 may further include a first voltage-dividing resistor R4 and a second voltage-dividing resistor R5, the first voltage-dividing resistor R4 and the second voltage-dividing resistor R5 are connected in series between the source of the sixth switching tube Q1B and the ground, and the base of the fifth switching tube Q2B is electrically connected between the first voltage-dividing resistor R4 and the second voltage-dividing resistor R5. Thus, the second capacitor 170, the parasitic diode on the sixth switching tube Q1B, the first voltage-dividing resistor R4, and the second voltage-dividing resistor R5 form a loop, when the voltage on the second capacitor 170 is lower than the set undervoltage threshold, the voltage output by the voltage-dividing circuit formed by the first voltage-dividing resistor R4 and the second voltage-dividing resistor R5 cannot turn on the fifth switching tube Q2B, that is, the fifth switching tube Q2B and the sixth switching tube Q1B are both turned off, so that the voltage on the second capacitor 170 is kept within the normal operating voltage range, and is not damaged due to undervoltage.

Optionally, in order to avoid the second capacitor 170, the parasitic diode of the sixth switching tube Q1B, the first voltage-dividing resistor R4 and the second voltage-dividing resistor R5 forming a loop, and flowing back to the second voltage-detecting chip 163 through the eleventh resistor R15, thereby causing the second voltage-detecting chip 163 to be damaged, in this embodiment, the third switching unit 162 may further include a first diode D1, an anode of the first diode D1 is electrically connected to the second voltage-detecting chip 163, and a cathode of the first diode D1 is electrically connected to the base of the fifth switching tube Q2B.

The utility model provides an among solar charging circuit 100 and the electronic equipment, this solar charging circuit 100 includes first electric capacity 120, starts control module 130 and main control chip 140, and first electric capacity 120, start control module 130 and main control chip 140 electricity are connected in proper order. The first capacitor 120 is charged by using the electric energy provided by the solar energy input module 110, and the start control module 130 controls the first capacitor 120 to be communicated with the main control chip 140 by detecting the output voltage of the first capacitor 120 when the output voltage of the first capacitor 120 reaches the start threshold of the main control chip 140, and at this time, the main control chip 140 is started according to the output voltage of the first capacitor 120. Thus, the first capacitor 120 is charged through the solar input module 110, so that the output voltage of the first capacitor 120 reaches the start threshold of the main control chip 140, and after the output voltage of the first capacitor 120 reaches the start threshold, the start control module 130 controls the first capacitor 120 to be communicated with the main control chip 140, thereby effectively ensuring the normal start of the main control chip 140. In addition, the utility model adopts a common discrete component to build the circuit, the cost is low, and compared with the scheme of directly collecting solar energy, the efficiency of solar energy collection can be effectively improved; the electronic equipment only needs short time from no energy to normal operation of the system, the starting speed is high, and the user experience is enhanced.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A solar charging circuit is characterized by comprising a first capacitor, a starting control module and a main control chip, wherein the first capacitor, the starting control module and the main control chip are electrically connected in sequence;

the first capacitor is used for charging by utilizing electric energy provided by the solar energy input module;

the starting control module is used for detecting the output voltage of the first capacitor and controlling the first capacitor to be communicated with the main control chip under the condition that the output voltage of the first capacitor reaches the starting threshold value of the main control chip;

the main control chip is used for starting according to the output voltage of the first capacitor.

2. The solar charging circuit of claim 1, wherein the start control module comprises a first voltage detection chip and a first switch unit, one end of the first voltage detection chip is electrically connected to the first capacitor, the other end of the first voltage detection chip is electrically connected to the control end of the first switch unit, the input end of the first switch unit is electrically connected to the first capacitor, and the output end of the first switch unit is electrically connected to the main control chip.

3. The solar charging circuit of claim 2, wherein the first switching unit comprises a first switching tube, a second switching tube and a first resistor, a gate of the first switching tube is electrically connected to the first voltage detection chip, a source of the first switching tube is grounded, and a drain of the first switching tube is electrically connected to a gate of the second switching tube;

the source electrode of the second switch tube is electrically connected with the first capacitor, the drain electrode of the second switch tube is electrically connected with the main control chip, one end of the first resistor is electrically connected between the first capacitor and the source electrode of the second switch tube, and the other end of the first resistor is electrically connected with the grid electrode of the second switch tube.

4. The solar charging circuit of claim 1, further comprising a second capacitor and a charging control module, wherein the second capacitor is electrically connected to the charging control module, and one end of the charging control module is electrically connected between the start control module and the main control chip; the capacity of the second capacitor is larger than that of the first capacitor;

the charging control module is used for controlling the solar energy input module to be communicated with the second capacitor according to the output voltage of the first capacitor after the main control chip is started, and charging the second capacitor through the solar energy input module; or the solar input module is controlled to be disconnected from the second capacitor, and the second capacitor is stopped to be charged through the solar input module.

5. The solar charging circuit of claim 4, wherein the charging control module comprises a second voltage detection chip, a second switch unit and a third switch unit, wherein one end of the second voltage detection chip is electrically connected between the start control module and the main control chip, and the other end of the second voltage detection chip is electrically connected with both a control end of the second switch unit and a control end of the third switch unit;

the input end of the second switch unit is electrically connected with the solar input module, the output end of the second switch unit is electrically connected with the input end of the third switch unit, and the output end of the third switch unit is electrically connected with the second capacitor.

6. The solar charging circuit of claim 5, wherein the second switching unit comprises a third switching tube, a fourth switching tube and a second resistor, wherein the base of the third switching tube is electrically connected with the second voltage detection chip, the collector of the third switching tube is electrically connected with the gate of the fourth switching tube, and the emitter of the third switching tube is grounded;

the source electrode of the fourth switch tube is electrically connected with the solar input module, the drain electrode of the fourth switch tube is electrically connected with the input end of the third switch unit, one end of the second resistor is electrically connected between the solar input module and the source electrode of the fourth switch tube, and the other end of the second resistor is electrically connected between the grid electrode of the fourth switch tube and the collector electrode of the third switch tube.

7. The solar charging circuit of claim 5, wherein the third switching unit comprises a fifth switching tube, a sixth switching tube and a third resistor, wherein the base of the fifth switching tube is electrically connected to the second voltage detecting chip, the collector of the fifth switching tube is electrically connected to the gate of the sixth switching tube, and the emitter of the fifth switching tube is grounded;

the source electrode of the sixth switching tube is electrically connected with the second switching unit, the drain electrode of the sixth switching tube is electrically connected with the second capacitor, one end of the third resistor is electrically connected between the grid electrode of the sixth switching tube and the collector electrode of the fifth switching tube, and the other end of the third resistor is electrically connected between the drain electrode of the sixth switching tube and the second capacitor.

8. The solar charging circuit of claim 7, wherein the third switching unit further comprises a first voltage-dividing resistor and a second voltage-dividing resistor, the first voltage-dividing resistor and the second voltage-dividing resistor are connected in series between the source of the sixth switching tube and ground, and the base of the fifth switching tube is electrically connected between the first voltage-dividing resistor and the second voltage-dividing resistor.

9. The solar charging circuit according to any one of claims 1-8, further comprising a holding circuit, wherein one end of the holding circuit is electrically connected to the start control module, and the other end of the holding circuit is electrically connected between the start control module and the main control chip;

the holding circuit is used for controlling the first capacitor to be in a communication state with the main control chip after the main control chip is started and under the condition that the output voltage of the first capacitor is smaller than the starting threshold value.

10. An electronic device comprising the solar charging circuit of any one of claims 1-9.

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