CN112165091B - Monitoring camera power supply system based on solar energy - Google Patents

Monitoring camera power supply system based on solar energy Download PDF

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CN112165091B
CN112165091B CN202011073862.9A CN202011073862A CN112165091B CN 112165091 B CN112165091 B CN 112165091B CN 202011073862 A CN202011073862 A CN 202011073862A CN 112165091 B CN112165091 B CN 112165091B
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resistor
triode
switching control
control module
electrode
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CN112165091A (en
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王军库
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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
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Control Of Electrical Variables (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; the input end of the lithium battery management module is connected with the output end of the power grid power supply module, the output end of the lithium battery management module is connected with the positive electrode of the lithium battery pack, the positive electrode 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 with the input end of the direct current boosting module, the first detection input end of the lithium battery switching control module is connected with the output end of the power grid power supply module, and the second detection input end is connected with the output end of the solar switching control module; 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

Monitoring camera power supply system based on solar energy
Technical Field
The invention relates to a power supply system, in particular to a solar-based monitoring camera power supply system.
Background
The camera is widely applied to the current production and life as an image acquisition device and is used for providing guarantee for the safety of the production and life of people and providing data support for security, so that the working stability of the camera is extremely important, and the working stability of the camera depends on two aspects: on one hand, the working stability of the camera is that of the camera, and on the other hand, the power supply stability of the camera is that of the camera; in the prior art, the mechanical structure and the electrical structure of the camera are developed very perfectly, so that the stability of the camera mainly depends on the stability of power supply, in the prior art, the power supply of the camera is commonly supplied by mains supply, the power supply source of the power supply mode is single, energy saving is not facilitated, the existing compound power supply is realized by adopting 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 facilitated.
Disclosure of Invention
In view of the above, the present invention aims to provide a solar-based monitoring camera power supply system.
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;
the output end of the solar cell panel is connected with the input end VSin of the solar switching control module, and the output end VSout of the solar switching control module is connected with the input end of the direct current boosting module;
the input end of the lithium battery management module is connected with the output end of the power grid power supply module, the output end of the lithium battery management module is connected with the positive electrode of the lithium battery pack, the positive electrode 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 with the input end of the direct current boost 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 with the output end of the power grid power supply module, and the second detection input end is connected with the output end of the solar switching control module;
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 with the control output end A of the solar energy switching control module, and the second control input end of the power grid switching control module is connected with the control output end B of the solar energy 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 MOS transistor M1 is an N-type MOS transistor, the drain electrode of the MOS transistor M1 is an input end VSin of a solar energy switching control module, one end of a resistor R1 is connected to the drain electrode of the MOS transistor M1, the other end of the resistor R1 is grounded through a resistor R2, the common connection point of the resistor R1 and the resistor R2 is connected with the reference electrode of the controllable precision voltage stabilizing source U1, the positive electrode of the controllable precision voltage stabilizing source U1 is grounded, the negative electrode of the controllable precision voltage stabilizing source U1 is connected to the drain electrode of the MOS transistor M1 through a resistor R3, the negative electrode of the controllable precision voltage stabilizing source U1 is connected to the inverting terminal of the comparator U1, one end of the resistor R4 is connected to the drain electrode of the MOS transistor M1 through a resistor R5, the other end of the resistor R4 is grounded through a common connection point of the resistor R5, the power end of the comparator U2 is connected to the drain electrode of the MOS transistor M1 through a resistor R6, the output end of the comparator U2 is connected to the grid electrode of the MOS transistor M1 through a resistor R7, the output end of the comparator U2 is used as a control end of the solar energy switching control module, the output end of the MOS transistor U1 is connected to the drain electrode of the MOS transistor M1 through a resistor R9, the junction point of the MOS transistor B1 is connected to the common connection point of the MOS transistor B1 is connected to the drain electrode, the common connection point of the MOS transistor B1 is connected to the MOS transistor B1 through the resistor B1, and the drain electrode is connected to the common connection point of the MOS transistor B1 through the resistor R1, and the drain electrode is connected to the common connection point of the MOS transistor B1 through the transistor B is connected to the common connection point;
the triode T1 is a P-type triode.
Preferably: the power grid switching control module comprises a resistor R10, a resistor R11, a resistor R13, a MOS tube M2, a triode T3, a triode T4 and a diode D2;
the MOS tube M2 is a P-type MOS tube, the source electrode of the MOS tube M2 is an input end VGin of the power grid switching control module, the drain electrode of the MOS tube M2 is connected with the positive electrode of the diode D2, and the negative electrode of the diode D2 is used as an 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 grid of the MOS tube M2, the grid of the MOS tube M2 is connected with the source electrode of the MOS tube M2 through a resistor R10, the grid of the MOS tube M2 is connected with the collector electrode of the triode T3 through a resistor R11, the base electrode of the triode T2 is a first control input end of a power grid switching control module, the collector electrode of the triode T2 is grounded, the emitter electrode of the triode T3 is grounded, the base electrode of the triode T3 is connected with the drain electrode of the MOS tube M2 through a resistor R12, the collector electrode of the triode T4 is connected to the base electrode of the triode T3, the emitter electrode of the triode T4 is grounded, the base electrode of the triode T4 is connected with one end of a resistor R13, and the other end of the resistor R13 is used as a second control input end of the power grid switching control module.
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, a MOS tube M3, a triode T5, a triode T6, a triode T7 and a diode D3;
the MOS tube M3 is a P-type MOS tube, the source of the MOS tube M3 is the input end VBin of the lithium battery switching control module, the drain electrode of the MOS tube M3 is connected with the positive electrode of the diode D3, and the negative electrode of the diode D3 is used as the 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 with the grid electrode of the MOS tube M3, the grid electrode of the MOS tube M3 is connected with the source electrode of the MOS tube M3 through a resistor R14, the grid electrode of the MOS tube M3 is connected with the collector electrode of the triode T6 through a resistor R15, the base electrode of the triode T5 is connected with the output end of the AND gate circuit U3 through a resistor R18, the collector electrode of the triode T5 is grounded, the emitter electrode of the triode T6 is grounded, the base electrode of the triode T6 is connected with the drain electrode of the MOS tube M3 through a resistor R16, the collector electrode of the triode T7 is connected with the base electrode of the triode T6, the emitter electrode of the triode T4 is grounded, and the base electrode of the triode T4 is connected with the output end of the AND gate circuit U3 through a resistor R17;
one end of the resistor R19 is grounded through the 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 gate 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 gate 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 the 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 filtering circuit, the output end of the filtering circuit is connected with the input end of the voltage stabilizing circuit, and the output end of the voltage stabilizing circuit is used as the output end of the power grid power supply module.
The invention has the beneficial effects that: by adopting the structure of the invention, the harmonic wave in the power grid can be effectively compensated, and fault-tolerant compensation can be performed even if any bridge arm in the inverter has a short circuit or an open circuit fault, so that the running stability of the power grid is ensured, and in the compensation process, the stable conduction of the bidirectional thyristor in the compensation loop can be effectively ensured, 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 battery pack and the lithium battery pack, and can effectively prevent the influence of the power failure of the photovoltaic battery pack and the commercial power battery pack on the power supply of the camera, thereby ensuring that the camera can continuously and stably collect target information and ensuring the continuity of monitoring image information.
According to the invention, power supply among the photovoltaic battery pack, the commercial power and the lithium battery pack is selected as one power supply, the photovoltaic battery pack is preferentially selected as the commercial power, and the commercial power is selected as the lithium battery pack again, so that on one hand, electric energy can be saved, and on the other hand, the quick switching of various power supply modes can be realized, and the interruption time of the camera in the power supply process is avoided.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic diagram of a solar energy switching control module according to the present invention.
Fig. 3 is a schematic diagram of a power 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 invention is further explained in detail below with reference to the drawings of the specification, and it should be noted that the invention is described in detail below with reference to the preferred embodiments, and any modifications and equivalents of the technical solution of the invention by those skilled in the art are included in the scope of the technical solution 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 panel, a lithium battery management module, a lithium battery pack, a direct-current boosting module, a power grid power supply module, a solar 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 with the input end VSin of the solar switching control module, and the output end VSout of the solar switching control module is connected with the input end of the direct current boosting module;
the input end of the lithium battery management module is connected with the output end of the power grid power supply module, the output end of the lithium battery management module is connected with the positive electrode of the lithium battery pack, the positive electrode 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 with the input end of the direct current boost 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 with the output end of the power grid power supply module, and the second detection input end is connected with the output end of the solar switching control module; 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 charges the lithium battery pack by using commercial power, and when the lithium battery pack is full, 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 with the control output end A of the solar energy switching control module, and the second control input end of the power grid switching control module is connected with the control output end B of the solar energy switching control module.
Under the above-mentioned structure, when solar energy power supply is sufficient, at first by solar energy power supply, after the sunshine light intensity descends, photovoltaic cell panel's output voltage then can reduce, when reducing to a certain extent, then switch to the commercial power supply, after photovoltaic cell panel's output voltage resumes 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 lithium cell group and supply power, consequently, through the structure in the above-mentioned, can effectively prevent because photovoltaic, commercial power outage exert an influence to the power supply of camera, thereby ensure that the camera can last stable collection target information, ensure monitor image information's continuity.
According to the invention, power supply among the photovoltaic battery pack, the commercial power and the lithium battery pack is selected as one power supply, the photovoltaic battery pack is preferentially selected as the commercial power, and the commercial power is selected as the lithium battery pack again, so that on one hand, electric energy can be saved, and on the other hand, the quick switching of various power supply modes can be realized, and the interruption time of the camera in the power supply process is avoided.
The photovoltaic cell panel is in the prior art, and is provided with an existing photovoltaic cell control circuit except the photovoltaic cell panel, the photovoltaic cell control circuit and the existing photovoltaic cell control circuit are often matched for use, and the photovoltaic cell control circuit is used for processing output current of the photovoltaic cell panel, so that output stability is guaranteed.
In a preferred embodiment, the solar energy switching control module includes 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 stabilizing source U1, a comparator U2, a MOS transistor M1, a triode T1, a capacitor C1 and a diode D1, where the controllable precision voltage stabilizing source U1 adopts a TL431 chip;
the MOS transistor M1 is an N-type MOS transistor, the drain electrode of the MOS transistor M1 is an input end VSin of a solar energy switching control module, one end of a resistor R1 is connected to the drain electrode of the MOS transistor M1, the other end of the resistor R1 is grounded through a resistor R2, the common connection point of the resistor R1 and the resistor R2 is connected with the reference electrode of the controllable precision voltage stabilizing source U1, the positive electrode of the controllable precision voltage stabilizing source U1 is grounded, the negative electrode of the controllable precision voltage stabilizing source U1 is connected to the drain electrode of the MOS transistor M1 through a resistor R3, the negative electrode of the controllable precision voltage stabilizing source U1 is connected to the inverting terminal of the comparator U1, one end of the resistor R4 is connected to the drain electrode of the MOS transistor M1 through a resistor R5, the other end of the resistor R4 is grounded through a common connection point of the resistor R5, the power end of the comparator U2 is connected to the drain electrode of the MOS transistor M1 through a resistor R6, the output end of the comparator U2 is connected to the grid electrode of the MOS transistor M1 through a resistor R7, the output end of the comparator U2 is used as a control end of the solar energy switching control module, the output end of the MOS transistor U1 is connected to the drain electrode of the MOS transistor M1 through a resistor R9, the junction point of the MOS transistor B1 is connected to the common connection point of the MOS transistor B1 is connected to the drain electrode, the common connection point of the MOS transistor B1 is connected to the MOS transistor B1 through the resistor B1, and the drain electrode is connected to the common connection point of the MOS transistor B1 through the resistor R1, and the drain electrode is connected to the common connection point of the MOS transistor B1 through the transistor B is connected to the common connection point;
the triode T1 is a P-type triode; in the above structure, the resistor R1, the resistor R2, and the controllable precision voltage stabilizing source U1 form a reference voltage, the on-off of the power supply of the photovoltaic panel is determined by setting the reference voltage, the resistor R4 and the resistor R5 sample the output voltage of the photovoltaic 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 so as to supply power to the direct current booster circuit, when the output level of the comparator U1 is higher, the MOS transistor M1 is turned off, and the power supply is stopped, but the junction capacitance of the MOS transistor M1 is lower, so that the switching speed is affected, therefore, when the capacitor C1 is used for accelerating the cut off of the capacitor M1, the voltage of the capacitor C1 cannot maintain the output voltage of the photovoltaic panel, when the voltage is maintained, the lower end of the capacitor C1 becomes negative pressure, so that the transistor T1 is turned on rapidly, when the capacitor M1 is discharged at the junction of the transistor U1 is higher.
In a preferred embodiment, the power grid switching control module includes a resistor R10, a resistor R11, a resistor R13, a MOS transistor M2, a triode T3, a triode T4, and a diode D2;
the MOS tube M2 is a P-type MOS tube, the source electrode of the MOS tube M2 is an input end VGin of the power grid switching control module, the drain electrode of the MOS tube M2 is connected with the positive electrode of the diode D2, and the negative electrode of the diode D2 is used as an 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 with the grid electrode of the MOS tube M2, the grid electrode of the MOS tube M2 is connected with the source electrode of the MOS tube M2 through a resistor R10, the grid electrode of the MOS tube M2 is connected with the collector electrode of the triode T3 through a resistor R11, the base electrode of the triode T2 is a first control input end of a power grid switching control module, the collector electrode of the triode T2 is grounded, the emitter electrode of the triode T3 is grounded, the base electrode of the triode T3 is connected with the drain electrode of the MOS tube M2 through a resistor R12, the collector electrode of the triode T4 is connected with the base electrode of the triode T3, the emitter electrode of the triode T4 is grounded, the base electrode of the triode T4 is connected with one end of the resistor R13, the other end of the resistor R13 is used as a second control input end of the power grid switching control module, when the MOS tube M2 is cut off in a normal state, the triode T2 is cut off, the triode T4 is conducted under the high level effect of the comparator U2, the triode T3 is cut off, after the MOS tube M1 is cut off, the lower end of the capacitor C1 becomes negative voltage, the triode T2 is rapidly conducted, the MOS tube M2 is conducted, the triode T4 is cut off, the triode T3 is conducted, the P-type MOS tube M2 is further maintained to be conducted, the photovoltaic cell panel is switched to mains supply, the capacitor C1 maintains the negative voltage for a short time, then the normal state is restored, and the triode T1 and the triode T2 are both cut off; after the photovoltaic cell panel resumes the power supply, comparator U1 outputs high level to make triode T4 switch on, MOS pipe M2 resumes to cut off, switches the commercial power and supplies power by the photovoltaic cell panel.
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 U3, a MOS transistor M3, a transistor T5, a transistor T6, a transistor T7, and a diode D3;
the MOS tube M3 is a P-type MOS tube, the source of the MOS tube M3 is the input end VBin of the lithium battery switching control module, the drain electrode of the MOS tube M3 is connected with the positive electrode of the diode D3, and the negative electrode of the diode D3 is used as the 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 with the grid electrode of the MOS tube M3, the grid electrode of the MOS tube M3 is connected with the source electrode of the MOS tube M3 through a resistor R14, the grid electrode of the MOS tube M3 is connected with the collector electrode of the triode T6 through a resistor R15, the base electrode of the triode T5 is connected with the output end of the AND gate circuit U3 through a resistor R18, the collector electrode of the triode T5 is grounded, the emitter electrode of the triode T6 is grounded, the base electrode of the triode T6 is connected with the drain electrode of the MOS tube M3 through a resistor R16, the collector electrode of the triode T7 is connected with the base electrode of the triode T6, the emitter electrode of the triode T4 is grounded, and the base electrode of the triode T4 is connected with the output end of the AND gate circuit U3 through a resistor R17;
one end of the resistor R19 is grounded through the 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 gate 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, a common connection point of the resistor R21 and the resistor R22 is connected with a second input end of the AND gate circuit U3, when the solar control module outputs voltage or the mains supply output voltage, the AND gate circuit U3 outputs high level, so that the triode T7 is conducted, the triode T6 is cut off, when the solar control module outputs voltage and the mains supply output voltage are both 0, the AND gate circuit U3 outputs 0 and is low level, the triode T5 is conducted rapidly at the moment, the MOS tube M3 is conducted rapidly, so that the lithium battery pack enters a power supply stage, when the solar switching control circuit or the power grid power supply module has output voltage, the AND gate circuit U3 recovers high level again, the triode T5 is cut off, the triode T7 is turned off, the MOS tube M3 is cut off equally, and power supply of the lithium battery pack is switched to a photovoltaic cell panel or mains supply is realized.
In a preferred embodiment, the power grid power supply module comprises a step-down transformer, a rectifying circuit, a filtering circuit and a voltage stabilizing circuit;
the input end of the step-down transformer is connected with the 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 filtering circuit, the output end of the filtering circuit is connected with the input end of the voltage stabilizing circuit, the output end of the voltage stabilizing circuit is used as the output end of the power grid power supply module, the rectifying circuit is a full-bridge rectifying circuit formed by existing diodes, the filtering circuit is an existing passive filter, the voltage stabilizing circuit adopts existing voltage stabilizing chips such as LM7812 and 78L24 and the like, the voltage stabilizing circuit needs to be selected according to the working voltage of the camera, the photovoltaic cell panel cannot generally adopt a large-scale cell panel, the lithium battery pack is generally connected in series with 3.7-4.2V lithium battery cells, the output voltage is insufficient to meet the voltage requirement of the camera, the voltage needs to be boosted by adopting a direct current voltage boosting circuit, the direct current voltage boosting circuit is supplied to the camera, and the model is determined according to the working voltage of the camera and the output voltage of the photovoltaic cell panel and the lithium battery pack.

Claims (3)

1. A monitoring camera power supply system based on solar energy is characterized in that: the system comprises a solar panel, a lithium battery management module, a lithium battery pack, a direct-current boosting module, a power grid power supply module, a solar 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 with the input end VSin of the solar switching control module, and the output end VSout of the solar switching control module is connected with the input end of the direct current boosting module;
the input end of the lithium battery management module is connected with the output end of the power grid power supply module, the output end of the lithium battery management module is connected with the positive electrode of the lithium battery pack, the positive electrode 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 with the input end of the direct current boost 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 with the output end of the power grid power supply module, and the second detection input end is connected with the output end of the solar switching control module;
the power grid power supply module converts commercial power into direct current, the output end of the power grid power supply 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 with 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 with the control output end B of the solar switching control module;
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 transistor M1 is an N-type MOS transistor, the drain electrode of the MOS transistor M1 is an input end VSin of a solar energy switching control module, one end of a resistor R1 is connected to the drain electrode of the MOS transistor M1, the other end of the resistor R1 is grounded through a resistor R2, the common connection point of the resistor R1 and the resistor R2 is connected with the reference electrode of the controllable precision voltage stabilizing source U1, the positive electrode of the controllable precision voltage stabilizing source U1 is grounded, the negative electrode of the controllable precision voltage stabilizing source U1 is connected to the drain electrode of the MOS transistor M1 through a resistor R3, the negative electrode of the controllable precision voltage stabilizing source U1 is connected to the inverting terminal of a comparator U2, one end of the resistor R4 is connected to the drain electrode of the MOS transistor M1 through a resistor R5, the other end of the resistor R4 is grounded through a common connection point of the resistor R5, the power end of the comparator U2 is connected to the drain electrode of the MOS transistor M1 through a resistor R6, the output end of the comparator U2 is connected to the grid electrode of the MOS transistor M1 through a resistor R7, the output end of the comparator U2 is used as a control end of the solar energy switching control module, the output end of the MOS transistor U1 is connected to the drain electrode of the MOS transistor M1 through a resistor R9, the junction point of the MOS transistor B1 is connected to the common connection point of the MOS transistor B1 is connected to the drain electrode, the common connection point of the MOS transistor B1 is connected to the MOS transistor B1 through the resistor B1, and the drain electrode is connected to the common connection point of the MOS transistor B1 through the resistor R1, and the drain electrode is connected to the common connection point of the MOS transistor B1 is connected to the common electrode through the common connection point;
the triode T1 is a P-type triode;
the resistor R1, the resistor R2 and the controllable precise voltage stabilizing source U1 form a reference voltage, the resistor R4 and the resistor R5 sample the output voltage of the photovoltaic cell panel, and the comparator U2 is used for comparing the sampled voltage with the reference voltage;
the power grid switching control module comprises a resistor R10, a resistor R11, a resistor R13, a MOS tube M2, a triode T3, a triode T4 and a diode D2;
the MOS tube M2 is a P-type MOS tube, the source electrode of the MOS tube M2 is an input end VGin of the power grid switching control module, the drain electrode of the MOS tube M2 is connected with the positive electrode of the diode D2, and the negative electrode of the diode D2 is used as an output end VGout of the power grid switching control module;
triode T2 is P type triode, triode T2's projecting pole is connected in MOS pipe M2's grid, MOS pipe M2's grid is connected with MOS pipe M2's source through resistance R10, MOS pipe M2's grid is connected with triode T3's collecting electrode through resistance R11, triode T2's base is the first control input of electric wire netting switching control module, triode T2's collecting electrode ground, triode T3's projecting pole ground, triode T3's base is connected with MOS pipe M2's drain electrode through resistance R12, triode T4's collecting electrode is connected in triode T3's base, triode T4's projecting pole ground, triode T4's base is connected with resistance R13's one end, electric wire netting switching control module's second control input is regarded as to the other end to resistance R13.
2. The solar-based surveillance camera power supply system of claim 1 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, a MOS tube M3, a triode T5, a triode T6, a triode T7 and a diode D3;
the MOS tube M3 is a P-type MOS tube, the source of the MOS tube M3 is the input end VBin of the lithium battery switching control module, the drain electrode of the MOS tube M3 is connected with the positive electrode of the diode D3, and the negative electrode of the diode D3 is used as the 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 with the grid electrode of the MOS tube M3, the grid electrode of the MOS tube M3 is connected with the source electrode of the MOS tube M3 through a resistor R14, the grid electrode of the MOS tube M3 is connected with the collector electrode of the triode T6 through a resistor R15, the base electrode of the triode T5 is connected with the output end of the AND gate circuit U3 through a resistor R18, the collector electrode of the triode T5 is grounded, the emitter electrode of the triode T6 is grounded, the base electrode of the triode T6 is connected with the drain electrode of the MOS tube M3 through a resistor R16, the collector electrode of the triode T7 is connected with the base electrode of the triode T6, the emitter electrode of the triode T4 is grounded, and the base electrode of the triode T4 is connected with the output end of the AND gate circuit U3 through a resistor R17;
one end of the resistor R19 is grounded through the 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 gate 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 gate circuit U3.
3. The solar-based surveillance camera power supply system of claim 1 wherein: 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 the 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 filtering circuit, the output end of the filtering circuit is connected with the input end of the voltage stabilizing circuit, and the output end of the voltage stabilizing circuit is used as the output end of the power grid power supply module.
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