CN112165091A - Monitoring camera power supply system based on solar energy - Google Patents
Monitoring camera power supply system based on solar energy Download PDFInfo
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- CN112165091A CN112165091A CN202011073862.9A CN202011073862A CN112165091A CN 112165091 A CN112165091 A CN 112165091A CN 202011073862 A CN202011073862 A CN 202011073862A CN 112165091 A CN112165091 A CN 112165091A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/63—Generation or supply of power specially adapted for television receivers
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a monitoring camera power supply system based on solar energy, which comprises a solar cell panel, a lithium battery management module, a lithium battery pack, a direct current boosting module, a power grid power supply module, a solar energy switching control module, a lithium battery switching control module and a power grid switching control module, wherein the solar cell management module is connected with the lithium battery pack; the input end of the lithium battery management module is connected to the output end of the power grid power supply module, the output end of the lithium battery management module is connected with the anode of the lithium battery pack, the anode of the lithium battery pack is connected with the input end of the lithium battery switching control module, the output end of the lithium battery switching control module is connected to the input end of the direct-current boosting module, the first detection input end of the lithium battery switching control module is connected to the output end of the power grid power supply module, and the second detection input end of the lithium battery switching control module is connected to the output end; the power grid switching control module converts commercial power into direct current, the output end of the power grid switching control module is connected with the input end of the power grid switching control module, and the output end of the power grid switching control module supplies power to the camera.
Description
Technical Field
The invention relates to a power supply system, in particular to a monitoring camera power supply system based on solar energy.
Background
The camera is widely applied to the current production and life as an image acquisition device, is used for providing guarantee for the safety of the production and life of people and providing data support for security, therefore, the working stability of the camera is very important, and the working stability of the camera depends on two aspects: on one hand, the working stability of the camera is ensured, and on the other hand, the power supply stability of the camera is ensured; in the prior art, the mechanical structure and the electrical structure of the camera have been developed completely, so the stability of the camera mainly depends on the stability of power supply, in the prior art, the power supply of the camera generally adopts mains supply, the power supply mode has a single power source and is not beneficial to energy saving, the existing combined power supply mode adopts a mode of solar energy and mains supply combined power supply, however, the existing circuit structure is complex, and the switching response between the solar energy and the mains supply is slow, so that the power supply interruption time of the camera is long, and the acquisition of security data is not beneficial.
Disclosure of Invention
In view of the above, in order to solve the above technical problems, the present invention aims to provide a monitoring camera power supply system based on solar energy.
The invention provides a monitoring camera power supply system based on solar energy, which comprises a solar cell panel, a lithium battery management module, a lithium battery pack, a direct current boosting module, a power grid power supply module, a solar energy switching control module, a lithium battery switching control module and a power grid switching control module, wherein the solar cell management module is connected with the lithium battery pack;
the output end of the solar cell panel is connected to the input end VSin of the solar switching control module, and the output end VSout of the solar switching control module is connected to the input end of the direct current boosting module;
the input end of the lithium battery management module is connected to the output end of the power grid power supply module, the output end of the lithium battery management module is connected with the anode of the lithium battery pack, the anode of the lithium battery pack is connected with the input end VBin of the lithium battery switching control module, the output end of the lithium battery switching control module is connected to the input end of the direct-current boosting module, the lithium battery switching control module is provided with a first detection input end and a second detection input end, the first detection input end is connected to the output end of the power grid power supply module, and the second detection input end is connected to the output end of the solar;
the power grid switching control module converts commercial power into direct current, the output end of the power grid switching control module is connected with the input end VGin of the power grid switching control module, the output end VGout of the power grid switching control module supplies power to the camera, the first control input end of the power grid switching control module is connected to the control output end A of the solar switching control module, and the second control input end of the power grid switching control module is connected to the control output end B of the solar switching control module.
Preferably: the solar energy switching control module comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a controllable precise voltage-stabilizing source U1, a comparator U2, a MOS tube M1, a triode T1, a capacitor C1 and a diode D1;
the solar photovoltaic power generation system comprises a solar switching control module, a MOS tube M1, a MOS tube M1, a resistor R1, a resistor R1, a resistor R2, a resistor R1 and a resistor R2, wherein the drain of the MOS tube M1 is connected with one end of the resistor R1, the other end of the resistor R1 is grounded through the resistor R2, a common connection point of the resistor R1 and the resistor R2 is connected with a reference electrode of a controllable precision voltage-stabilizing source U1, the anode of the controllable precision voltage-stabilizing source U1 is grounded, the cathode of the controllable precision voltage-stabilizing source U1 is connected with the drain of the MOS tube M1 through the resistor R3, the cathode of the controllable precision voltage-stabilizing source U1 is connected with the inverting terminal of a comparator U1, one end of the resistor R4 is connected with the drain of the MOS tube M4, the other end of the resistor R4 is grounded through the resistor R4, the common connection point of the resistor R4 and the common connection point of the resistor R4 is connected with the same-phase terminal of the power supply terminal of the comparator U4, the, the output end of the comparator U2 is used as the control output end B of the solar energy switching control module, the output end of the comparator U2 is connected to the base electrode of a triode T1, the emitter electrode of the triode T1 is connected to the grid electrode of a MOS transistor M1, the collector electrode of the triode T1 is grounded, the base electrode of a triode T1 is grounded after being connected in series with a resistor R8 and a resistor R9, the source electrode of a MOS transistor M1 is connected with the anode electrode of a diode D1, the cathode electrode of the diode D1 is the output end VSout of the solar energy switching control module, the source electrode of the MOS transistor M1 is connected to the common connection point between a resistor R8 and a resistor R9 through a capacitor, and the common connection point of the resistor R8 and the resistor R9 is;
the transistor T1 is a P-type transistor.
Preferably: the grid switching control module comprises a resistor R10, a resistor R11, a resistor R13, an MOS transistor M2, a triode T2, a triode T3, a triode T4 and a diode D2;
the MOS transistor M2 is a P-type MOS transistor, the source electrode of the MOS transistor M2 is the input end VGin of the power grid switching control module, the drain electrode of the MOS transistor M2 is connected with the anode of the diode D2, and the cathode of the diode D2 is used as the output end VGout of the power grid switching control module;
the triode T2 is a P-type triode, the emitter of the triode T2 is connected to the gate of the MOS transistor M2, the gate of the MOS transistor M2 is connected to the source of the MOS transistor M2 through a resistor R10, the gate of the MOS transistor M2 is connected to the collector of the triode T3 through a resistor R11, the base of the triode T2 is the first control input terminal of the grid switching control module, the collector of the triode T2 is grounded, the emitter of the triode T3 is grounded, the base of the triode T3 is connected to the drain of the MOS transistor M2 through a resistor R12, the collector of the triode T4 is connected to the base of the triode T3, the emitter of the triode T4 is grounded, the base of the triode T4 is connected to one end of a resistor R13, and the other end of the resistor R13 is used as the second control input.
Preferably: the lithium battery switching control module comprises a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a resistor R22, an AND gate circuit U3, an MOS transistor M3, a triode T5, a triode T6, a triode T7 and a diode D3;
the MOS transistor M3 is a P-type MOS transistor, the source electrode of the MOS transistor M3 is an input end VBin of the lithium battery switching control module, the drain electrode of the MOS transistor M3 is connected with the anode of the diode D3, and the cathode of the diode D3 is used as an output end VBout of the lithium battery switching control module;
the triode T5 is a P-type triode, the emitter of the triode T5 is connected to the gate of the MOS tube M3, the gate of the MOS tube M3 is connected with the source of the MOS tube M3 through a resistor R14, the gate of the MOS tube M3 is connected with the collector of the triode T6 through a resistor R15, the base of the triode T5 is connected to the output end of the AND gate circuit U3 through a resistor R18, the collector of the triode T5 is grounded, the emitter of the triode T6 is grounded, the base of the triode T6 is connected with the drain of the MOS tube M3 through a resistor R16, the collector of the triode T7 is connected to the base of the triode T6, the emitter of the triode T4 is grounded, and the base of the triode T4 is connected to the output end of the AND gate circuit;
one end of the resistor R19 is grounded through a resistor R20, the other end of the resistor R19 is a first detection input end, and a common connection point of the resistor R19 and the resistor R20 is connected with a first input end of the AND circuit U3;
one end of the resistor R21 is grounded through the resistor R22, the other end of the resistor R21 is a second detection input end, and a common connection point of the resistor R21 and the resistor R22 is connected with a second input end of the AND circuit U3.
Preferably: the power grid power supply module comprises a step-down transformer, a rectifying circuit, a filter circuit and a voltage stabilizing circuit;
the input end of the step-down transformer is connected with a mains supply, the output end of the step-down transformer is connected with the input end of the rectifying circuit, the output end of the rectifying circuit is connected with the input end of the filter circuit, the output end of the filter circuit is connected with the input end of the voltage stabilizing circuit, and the output end of the voltage stabilizing circuit serves as the output end of the power grid power supply module.
The invention has the beneficial effects that: by the structure, harmonic waves in a power grid can be effectively compensated, fault-tolerant compensation can be performed even if any one bridge arm in the inverter has a short circuit or open circuit fault, so that the stability of the operation of the power grid is ensured, and the stable conduction of the bidirectional thyristor in a compensation loop can be effectively ensured in the compensation process, so that the stability of the whole compensation system is ensured.
The invention can realize the following effects:
the invention has three power supply modes of the photovoltaic battery pack, the commercial power pack and the lithium battery pack, and can effectively prevent the influence on the power supply of the camera due to the outage of the photovoltaic battery pack and the commercial power pack, thereby ensuring that the camera can continuously and stably acquire target information and ensuring the continuity of monitoring image information.
According to the invention, the photovoltaic, the commercial power and the lithium battery pack are supplied with power alternatively, the photovoltaic is preferred, the commercial power is used secondly, and the lithium battery pack is used thirdly, so that on one hand, the electric energy can be saved, on the other hand, the rapid switching of various power supply modes can be realized, and the overlong interruption time of the camera in the power supply process is avoided.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic diagram of a solar switching control module according to the present invention.
Fig. 3 is a schematic diagram of a grid switching control module according to the present invention.
Fig. 4 is a schematic diagram of a lithium battery switching control module according to the present invention.
Detailed Description
The present invention is explained in further detail below with reference to the drawings attached to the specification, and it should be noted that the detailed description of the present invention is only for the preferred embodiments, and any modifications and equivalents of the technical solutions of the present invention by those skilled in the art are included in the scope of the technical solutions of the present application.
The invention provides a monitoring camera power supply system based on solar energy, which is characterized in that: the system comprises a solar cell panel, a lithium battery management module, a lithium battery pack, a direct current boosting module, a power grid power supply module, a solar energy switching control module, a lithium battery switching control module and a power grid switching control module;
the output end of the solar cell panel is connected to the input end VSin of the solar switching control module, and the output end VSout of the solar switching control module is connected to the input end of the direct current boosting module;
the input end of the lithium battery management module is connected to the output end of the power grid power supply module, the output end of the lithium battery management module is connected with the anode of the lithium battery pack, the anode of the lithium battery pack is connected with the input end VBin of the lithium battery switching control module, the output end of the lithium battery switching control module is connected to the input end of the direct-current boosting module, the lithium battery switching control module is provided with a first detection input end and a second detection input end, the first detection input end is connected to the output end of the power grid power supply module, and the second detection input end is connected to the output end of the solar; the lithium battery management module adopts an existing lithium battery management chip and is used for managing the voltage of the lithium battery pack, when the voltage of the lithium battery pack is lower than a set value, the lithium battery management module adopts commercial power to charge the lithium battery pack, and after the lithium battery pack is fully charged, the lithium battery management module stops charging.
The power grid switching control module converts commercial power into direct current, the output end of the power grid switching control module is connected with the input end VGin of the power grid switching control module, the output end VGout of the power grid switching control module supplies power to the camera, the first control input end of the power grid switching control module is connected to the control output end A of the solar switching control module, and the second control input end of the power grid switching control module is connected to the control output end B of the solar switching control module.
Under above-mentioned structure, when the solar energy power supply is sufficient, at first by the solar energy power supply, after sunshine light intensity descends, photovoltaic cell panel's output voltage then can reduce, when reducing to a certain extent, then switch to the mains supply, after photovoltaic cell panel's output voltage recovered the setting value, then switch to solar energy from the commercial power again, when solar energy output voltage can not satisfy the demand and the commercial power outage takes place, then switch to the lithium cell group and supply power, therefore, through the structure among the above-mentioned, can effectively prevent because photovoltaic, the commercial power outage produces the influence to the power supply of camera, thereby ensure that the camera can continuously stably gather target information, ensure the continuity of monitoring image information.
According to the invention, the photovoltaic, the commercial power and the lithium battery pack are supplied with power alternatively, the photovoltaic is preferred, the commercial power is used secondly, and the lithium battery pack is used thirdly, so that on one hand, the electric energy can be saved, on the other hand, the rapid switching of various power supply modes can be realized, and the overlong interruption time of the camera in the power supply process is avoided.
The photovoltaic cell panel is in the prior art, and except the photovoltaic cell panel, the photovoltaic cell panel also has the existing photovoltaic cell control circuit, the photovoltaic cell control circuit and the existing photovoltaic cell control circuit are often used in a matched manner, the photovoltaic cell control circuit is used for processing the output current of the photovoltaic cell panel, so that the output stability is ensured, although after the processing is carried out through the photovoltaic cell control circuit, when the solar light intensity is reduced, the output voltage of the whole photovoltaic cell panel is still reduced.
In a preferred embodiment, the solar switching control module comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a controllable precision voltage regulator U1, a comparator U2, a MOS transistor M1, a triode T1, a capacitor C1 and a diode D1, wherein the controllable precision voltage regulator U1 is a TL431 chip;
the solar photovoltaic power generation system comprises a solar switching control module, a MOS tube M1, a MOS tube M1, a resistor R1, a resistor R1, a resistor R2, a resistor R1 and a resistor R2, wherein the drain of the MOS tube M1 is connected with one end of the resistor R1, the other end of the resistor R1 is grounded through the resistor R2, a common connection point of the resistor R1 and the resistor R2 is connected with a reference electrode of a controllable precision voltage-stabilizing source U1, the anode of the controllable precision voltage-stabilizing source U1 is grounded, the cathode of the controllable precision voltage-stabilizing source U1 is connected with the drain of the MOS tube M1 through the resistor R3, the cathode of the controllable precision voltage-stabilizing source U1 is connected with the inverting terminal of a comparator U1, one end of the resistor R4 is connected with the drain of the MOS tube M4, the other end of the resistor R4 is grounded through the resistor R4, the common connection point of the resistor R4 and the common connection point of the resistor R4 is connected with the same-phase terminal of the power supply terminal of the comparator U4, the, the output end of the comparator U2 is used as the control output end B of the solar energy switching control module, the output end of the comparator U2 is connected to the base electrode of a triode T1, the emitter electrode of the triode T1 is connected to the grid electrode of a MOS transistor M1, the collector electrode of the triode T1 is grounded, the base electrode of a triode T1 is grounded after being connected in series with a resistor R8 and a resistor R9, the source electrode of a MOS transistor M1 is connected with the anode electrode of a diode D1, the cathode electrode of the diode D1 is the output end VSout of the solar energy switching control module, the source electrode of the MOS transistor M1 is connected to the common connection point between a resistor R8 and a resistor R9 through a capacitor, and the common connection point of the resistor R8 and the resistor R9 is;
the triode T1 is a P-type triode; in the above structure, the resistor R1, the resistor R2 and the controllable precision voltage regulator U1 form a reference voltage, the on/off of the power supply of the photovoltaic cell panel is determined by setting the reference voltage, the resistor R4 and the resistor R5 sample the output voltage of the photovoltaic cell panel, the comparator U2 is used for comparing the sampled voltage with the reference voltage, when the sampled voltage is less than or equal to the reference voltage, the comparator U2 outputs a low level, when the sampled voltage is greater than the reference voltage, the comparator U2 outputs a high level, the MOS transistor M1 is turned on to supply power to the dc boost circuit, when the comparator U1 outputs a level, the MOS transistor M1 is turned off to stop the power supply, but the junction capacitance of the MOS transistor M1 is slow in turn-off speed to affect the switching speed, therefore, when the acceleration M1 is turned off by the capacitor C1, the voltage of the capacitor C1 cannot be cut off by the way after the M1, the output voltage of the photovoltaic cell panel can be maintained, during the hold, the lower end of the capacitor C1 becomes a negative voltage, so that the transistor T1 is turned on quickly to discharge the junction capacitor of the MOS transistor M1 quickly, and when the comparator U2 outputs a high level, the transistor T1 is turned off.
In a preferred embodiment, the grid switching control module includes a resistor R10, a resistor R11, a resistor R13, a MOS transistor M2, a transistor T2, a transistor T3, a transistor T4, and a diode D2;
the MOS transistor M2 is a P-type MOS transistor, the source electrode of the MOS transistor M2 is the input end VGin of the power grid switching control module, the drain electrode of the MOS transistor M2 is connected with the anode of the diode D2, and the cathode of the diode D2 is used as the output end VGout of the power grid switching control module;
the transistor T2 is a P-type transistor, the emitter of the transistor T2 is connected to the gate of the MOS transistor M2, the gate of the MOS transistor M2 is connected to the source of the MOS transistor M2 through the resistor R10, the gate of the MOS transistor M2 is connected to the collector of the transistor T3 through the resistor R11, the base of the transistor T2 is the first control input terminal of the grid switching control module, the collector of the transistor T2 is grounded, the emitter of the transistor T3 is grounded, the base of the transistor T3 is connected to the drain of the MOS transistor M2 through the resistor R12, the collector of the transistor T4 is connected to the base of the transistor T3, the emitter of the transistor T4 is grounded, the base of the transistor T4 is connected to one end of the resistor R13, the other end of the resistor R13 is used as the second control input terminal of the grid switching control module, the transistor M2 is turned off in a normal state, the transistor T2 is turned on, and the transistor T4 is, the triode T3 is cut off, when the MOS transistor M1 is cut off, the lower end of the capacitor C1 becomes a negative voltage, the triode T2 is rapidly turned on, the MOS transistor M2 is turned on, and at this time, the triode T4 is cut off, the triode T3 is turned on, so that the P-type MOS transistor M2 is maintained to be turned on, the photovoltaic cell panel is switched to the mains supply, the time for the capacitor C1 to maintain the negative voltage is short, then the normal state is recovered, and the triode T1 and the triode T2 are both cut off; after the photovoltaic cell panel recovers power supply, the comparator U1 outputs high level, so that the triode T4 is conducted, the MOS transistor M2 recovers to be cut off, commercial power is switched to supply power, and the photovoltaic cell panel supplies power.
In a preferred embodiment, the lithium battery switching control module includes a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a resistor R22, an and gate circuit U3, a MOS transistor M3, a transistor T5, a transistor T6, a transistor T7, and a diode D3;
the MOS transistor M3 is a P-type MOS transistor, the source electrode of the MOS transistor M3 is an input end VBin of the lithium battery switching control module, the drain electrode of the MOS transistor M3 is connected with the anode of the diode D3, and the cathode of the diode D3 is used as an output end VBout of the lithium battery switching control module;
the triode T5 is a P-type triode, the emitter of the triode T5 is connected to the gate of the MOS tube M3, the gate of the MOS tube M3 is connected with the source of the MOS tube M3 through a resistor R14, the gate of the MOS tube M3 is connected with the collector of the triode T6 through a resistor R15, the base of the triode T5 is connected to the output end of the AND gate circuit U3 through a resistor R18, the collector of the triode T5 is grounded, the emitter of the triode T6 is grounded, the base of the triode T6 is connected with the drain of the MOS tube M3 through a resistor R16, the collector of the triode T7 is connected to the base of the triode T6, the emitter of the triode T4 is grounded, and the base of the triode T4 is connected to the output end of the AND gate circuit;
one end of the resistor R19 is grounded through a resistor R20, the other end of the resistor R19 is a first detection input end, and a common connection point of the resistor R19 and the resistor R20 is connected with a first input end of the AND circuit U3;
one end of the resistor R21 is grounded through the resistor R22, the other end of the resistor R21 is a second detection input end, the common connection point of the resistor R21 and the resistor R22 is connected with a second input end of the AND circuit U3, when the solar control module outputs voltage or the commercial power output voltage, the AND gate circuit U3 outputs high level, thereby, the triode T7 is conducted, the triode T6 is cut off, when the output voltage of the solar control module and the output voltage of the commercial power are both 0, the output of the and circuit U3 is 0 and low, the transistor T5 is turned on rapidly, so that the MOS transistor M3 is turned on rapidly, therefore, when the lithium battery pack enters a power supply stage, when any one of the solar energy switching control circuit or the power grid power supply module has output voltage, the and gate circuit U3 resumes the high level again, the transistor T5 is turned off, the transistor T7 is turned on, the transistor T6 is turned off, and the MOS transistor M3 is also turned off, thereby realizing switching of the power supply of the lithium battery pack to the power supply of the photovoltaic cell panel or the power supply of the commercial power.
In a preferred embodiment, the power supply module of the power grid comprises a step-down transformer, a rectifying circuit, a filter circuit and a voltage stabilizing circuit;
the input end of the step-down transformer is connected with a mains supply, the output end of the step-down transformer is connected with the input end of the rectifying circuit, the output end of the rectifying circuit is connected with the input end of the filter circuit, the output end of the voltage stabilizing circuit is used as the output end of the power grid power supply module, wherein the rectifying circuit is a full-bridge rectifying circuit consisting of the existing diodes, the filter circuit is an existing passive filter, the voltage stabilizing circuit adopts the existing voltage stabilizing chip, such as LM7812, 78L24 and the like, and needs to be selected according to the working voltage of the camera, as the photovoltaic cell panel can not adopt a large-scale cell panel generally, and the lithium cell group adopts 3.7-4.2V lithium cell units which are connected in series and the output voltage of the lithium cell group is not enough to meet the voltage requirement of the camera, and needs, the direct-current booster circuit adopts the existing direct-current booster circuit, can be purchased in direct market, and determines the model according to the working voltage of the camera and the output voltage of the photovoltaic cell panel and the lithium battery pack.
Claims (5)
1. The utility model provides a first power supply system of surveillance camera based on solar energy which characterized in that: the system comprises a solar cell panel, a lithium battery management module, a lithium battery pack, a direct current boosting module, a power grid power supply module, a solar energy switching control module, a lithium battery switching control module and a power grid switching control module;
the output end of the solar cell panel is connected to the input end VSin of the solar switching control module, and the output end VSout of the solar switching control module is connected to the input end of the direct current boosting module;
the input end of the lithium battery management module is connected to the output end of the power grid power supply module, the output end of the lithium battery management module is connected with the anode of the lithium battery pack, the anode of the lithium battery pack is connected with the input end VBin of the lithium battery switching control module, the output end of the lithium battery switching control module is connected to the input end of the direct-current boosting module, the lithium battery switching control module is provided with a first detection input end and a second detection input end, the first detection input end is connected to the output end of the power grid power supply module, and the second detection input end is connected to the output end of the solar;
the power grid switching control module converts commercial power into direct current, the output end of the power grid switching control module is connected with the input end VGin of the power grid switching control module, the output end VGout of the power grid switching control module supplies power to the camera, the first control input end of the power grid switching control module is connected to the control output end A of the solar switching control module, and the second control input end of the power grid switching control module is connected to the control output end B of the solar switching control module.
2. A solar-based surveillance camera power supply system according to claim 1, characterized by: the solar energy switching control module comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a controllable precise voltage-stabilizing source U1, a comparator U2, a MOS tube M1, a triode T1, a capacitor C1 and a diode D1;
the MOS tube M1 is an N-type MOS tube, the drain of the MOS tube M1 is an input terminal VSin of the solar switching control module, one end of a resistor R1 is connected with the drain of the MOS tube M1, the other end of the resistor R1 is grounded through a resistor R2, a common connection point of the resistor R1 and the resistor R2 is connected with a reference pole of a controllable precision voltage-stabilizing source U1, the anode of the controllable precision voltage-stabilizing source U1 is grounded, the cathode of the controllable precision voltage-stabilizing source U1 is connected with the drain of the MOS tube M1 through a resistor R3, the cathode of the controllable precision voltage-stabilizing source U1 is connected with the inverting terminal of the comparator U1, one end of the resistor R1 is connected with the drain of the MOS tube M1, the other end of the resistor R1 is grounded through the resistor R1, the common connection point of the resistor R1 and the resistor R1 is connected with the inverting terminal of the comparator U1, the drain of the comparator U1 is connected with the drain of the MOS tube M1 through a gate of the MOS tube M1, and the output terminal of the comparator U1 is, the output end of the comparator U2 is connected to the base of a triode T1, the emitter of the triode T1 is connected to the gate of a MOS tube M1, the collector of the triode T1 is grounded, the base of the triode T1 is grounded after being connected in series with a resistor R8 and a resistor R9, the source of the MOS tube M1 is connected with the anode of a diode D1, the cathode of the diode D1 is the output end VSout of the solar switching control module, the source of the MOS tube M1 is connected to the common connection point between the resistor R8 and the resistor R9 through a capacitor, and the common connection point of the resistor R8 and the resistor R9 is used as the control output end A of the solar switching control module;
the transistor T1 is a P-type transistor.
3. A solar-based surveillance camera power supply system according to claim 2, characterized in that: the grid switching control module comprises a resistor R10, a resistor R11, a resistor R13, an MOS transistor M2, a triode T2, a triode T3, a triode T4 and a diode D2;
the MOS transistor M2 is a P-type MOS transistor, the source electrode of the MOS transistor M2 is the input end VGin of the power grid switching control module, the drain electrode of the MOS transistor M2 is connected with the anode of the diode D2, and the cathode of the diode D2 is used as the output end VGout of the power grid switching control module;
the triode T2 is a P-type triode, the emitter of the triode T2 is connected to the gate of the MOS transistor M2, the gate of the MOS transistor M2 is connected to the source of the MOS transistor M2 through a resistor R10, the gate of the MOS transistor M2 is connected to the collector of the triode T3 through a resistor R11, the base of the triode T2 is the first control input terminal of the grid switching control module, the collector of the triode T2 is grounded, the emitter of the triode T3 is grounded, the base of the triode T3 is connected to the drain of the MOS transistor M2 through a resistor R12, the collector of the triode T4 is connected to the base of the triode T3, the emitter of the triode T4 is grounded, the base of the triode T4 is connected to one end of a resistor R13, and the other end of the resistor R13 is used as the second control input.
4. A solar-based surveillance camera power supply system according to claim 3, wherein: the lithium battery switching control module comprises a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a resistor R22, an AND gate circuit U3, an MOS transistor M3, a triode T5, a triode T6, a triode T7 and a diode D3;
the MOS transistor M3 is a P-type MOS transistor, the source electrode of the MOS transistor M3 is an input end VBin of the lithium battery switching control module, the drain electrode of the MOS transistor M3 is connected with the anode of the diode D3, and the cathode of the diode D3 is used as an output end VBout of the lithium battery switching control module;
the triode T5 is a P-type triode, the emitter of the triode T5 is connected to the gate of the MOS tube M3, the gate of the MOS tube M3 is connected with the source of the MOS tube M3 through a resistor R14, the gate of the MOS tube M3 is connected with the collector of the triode T6 through a resistor R15, the base of the triode T5 is connected to the output end of the AND gate circuit U3 through a resistor R18, the collector of the triode T5 is grounded, the emitter of the triode T6 is grounded, the base of the triode T6 is connected with the drain of the MOS tube M3 through a resistor R16, the collector of the triode T7 is connected to the base of the triode T6, the emitter of the triode T4 is grounded, and the base of the triode T4 is connected to the output end of the AND gate circuit;
one end of the resistor R19 is grounded through a resistor R20, the other end of the resistor R19 is a first detection input end, and a common connection point of the resistor R19 and the resistor R20 is connected with a first input end of the AND circuit U3;
one end of the resistor R21 is grounded through the resistor R22, the other end of the resistor R21 is a second detection input end, and a common connection point of the resistor R21 and the resistor R22 is connected with a second input end of the AND circuit U3.
5. A solar-based surveillance camera power supply system according to claim 1, characterized by: the power grid power supply module comprises a step-down transformer, a rectifying circuit, a filter circuit and a voltage stabilizing circuit;
the input end of the step-down transformer is connected with a mains supply, the output end of the step-down transformer is connected with the input end of the rectifying circuit, the output end of the rectifying circuit is connected with the input end of the filter circuit, the output end of the filter circuit is connected with the input end of the voltage stabilizing circuit, and the output end of the voltage stabilizing circuit serves as the output end of the power grid power supply module.
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