CN208548751U - A kind of dual power supply switching circuit of video camera - Google Patents

A kind of dual power supply switching circuit of video camera Download PDF

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Publication number
CN208548751U
CN208548751U CN201821313826.3U CN201821313826U CN208548751U CN 208548751 U CN208548751 U CN 208548751U CN 201821313826 U CN201821313826 U CN 201821313826U CN 208548751 U CN208548751 U CN 208548751U
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China
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charging
circuit
resistance
power supply
capacitor
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CN201821313826.3U
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Chinese (zh)
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张一�
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Chengdu Rui Yun Jie Technology Co Ltd
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Chengdu Rui Yun Jie Technology Co Ltd
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Abstract

The utility model discloses a kind of dual power supply switching circuits of video camera, including charging circuit and power supply switch circuit, the charging circuit includes the charging input display circuit and charging output circuit of charging chip and its connection, the power supply switch circuit includes switching element, energy-storage travelling wave tube and control switching circuit, the switching element is connected between charging output circuit and control switching circuit, on-off for control circuit, the energy-storage travelling wave tube is connect with charging output circuit and switching element, charge and discharge for power supply switch circuit, the control switching circuit is connect with switching element and external input voltage, for controlling the time of switching element conducting.The utility model passes through the switching characteristic using metal-oxide-semiconductor Q1, to video camera using internal/external power switching charging, such digital product is in charging, in the case where the cutting of external charge power supply, it can be immediately converted as internal cell to charge, reduce power-off and video camera bring is damaged.

Description

A kind of dual power supply switching circuit of video camera
Technical field
The utility model relates to power supply power supply technical fields, switch electricity more particularly to a kind of dual power supply of video camera Road.
Background technique
With the continuous development of society, the living standard of people is also being continuously improved.In development in science and technology, video camera is played the part of Drill very important keeper role.With the continuous improvement of digital photographing technique level, the essential attribute function of video camera It has been approached perfect, tends to be complete meanwhile, it is capable to which efficiently prolonged power supply is to guarantee the normal operation of video camera in function It is the necessary point of video camera development need concern.Now, video camera is widely used in people's work and life, at present market On have a two class video cameras, a kind of video camera is mating adapter power supply, have something can long-time powered operation, but its is unlimited multiple Miscellaneous, installation site is limited, cannot install video camera far from power supply;Another kind of is using battery powered video camera, and advantage is can To place everywhere, easy for installation but its requirement to power consumption is very stringent, and the use duration of battery is shorter, just must then carry out Charging or replacement battery.If power supply is sudden shut off, then can cause to damage to video camera in charging.So for the second class It, can convert charging source be very important immediately when external power supply is sudden shut off for video camera.
Utility model content
The purpose of this utility model is that: a kind of dual power supply switching circuit of video camera is provided, video camera can be made to exist When external charging power supply interrupts suddenly, internal battery powers can be immediately converted as to protect video camera.
To achieve the above object, the technical solution of the utility model are as follows:
A kind of dual power supply switching circuit of video camera, including charging circuit and power supply switch circuit, the charging electricity Road includes the charging input display circuit and charging output circuit of charging chip and its connection, and the power supply switch circuit includes cutting Change element, energy-storage travelling wave tube and control switching circuit, the switching element be connected to charging output circuit and control switching circuit it Between, for the on-off of control circuit, the energy-storage travelling wave tube is connect with charging output circuit and switching element, for power supply switching electricity The charge and discharge on road, the control switching circuit are connect with switching element and external input voltage, for controlling switching element conducting Time, the charging output circuit includes resistance R4, resistance R5, diode D3, wherein one end connection charging core of resistance R4 The pin 4 of piece, one end of resistance R5 are connected to the pin 5 of charging chip, and one end of diode D3 is connected to drawing for charging chip Foot 1, one end of the other end connection capacitor C2 of diode D3, the pin 6 of charging chip and the other end of resistance R4, R5 connect Ground.
Further, the switching element is metal-oxide-semiconductor Q1, and energy-storage travelling wave tube is capacitor C2, and the source level of the metal-oxide-semiconductor Q1 connects External charging power supply, grid connect control switching circuit, and drain connects one end of capacitor C2, the other end ground connection of capacitor C2.
Further, the control switching circuit includes resistance R6, resistance R7, capacitor C3, capacitor C4, wherein resistance R6, One end of capacitor C3 is connected to the grid of metal-oxide-semiconductor Q1 after connecting respectively with one end of resistance R7, capacitor C4, one end of resistance R6 and External input voltage is connected after one end connection of capacitor C3, the other end of resistance R7 and the other end of capacitor C4 are grounded.
Further, the charging input display circuit includes light emitting diode D1, light emitting diode D2, resistance R1, electricity Hinder R2, resistance R3 and capacitor C1, after wherein one end of light emitting diode D1, D2 is connect with one end of capacitor C1 with charging chip Pin 3 is connected, and 5V external voltage, light-emitting diodes are accessed in the common end between one end of capacitor C1 and one end of light emitting diode D1 One end of the other end connection resistance R1 of pipe D1, one end of the other end connection resistance R2 of light emitting diode D2, resistance R1's is another One end connects the pin 10 of charging chip, the pin 2 of the other end connection charging chip of resistance R2, and one end connection of resistance R3 is filled The pin 7 of electrical chip, capacitor C1, resistance R3 the other end be grounded.
As the above scheme is adopted, the utility model has the beneficial effects that: solving the deficiencies in the prior art, this reality With a kind of novel dual power supply switching circuit for proposing video camera, including charging circuit and power supply switch circuit.Pass through utilization The switching characteristic of metal-oxide-semiconductor Q1, to video camera using the switching charging of inside and outside dual power supply, external power supply power supply generates voltage and reaches camera shooting Machine core board just stops after fully charged, and metal-oxide-semiconductor Q1 is in an off state at this time;But when being in charged state, if external charging is electric Source is abruptly cut at this point, the metal-oxide-semiconductor Q1 in circuit is in the conductive state, can automatically switch to internal battery powers, so number Code product is in charging, in the case where external charge power supply is sudden shut off, can be immediately converted as internal cell charging, reduce The unexpected power-off of external charging power supply damages video camera bring.
Detailed description of the invention
Fig. 1 is the circuit diagram of the dual power supply switching circuit of video camera described in the utility model.
Specific embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with attached drawing, it is clear that described Embodiment is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, originally Field those of ordinary skill every other embodiment obtained without making creative work belongs to practical Novel protected range.
Embodiment
As shown in Figure 1, a kind of dual power supply switching circuit of video camera, including charging circuit and power supply switch circuit, The charging circuit includes the charging input display circuit and charging output circuit of charging chip and its connection, the power supply switching Circuit includes switching element, energy-storage travelling wave tube and control switching circuit, and the switching element is connected to charging output circuit and switching Between control circuit, for the on-off of control circuit, the energy-storage travelling wave tube is connect with charging output circuit and switching element, is used for The charge and discharge of power supply switch circuit, the control switching circuit are connect with switching element and external input voltage, are cut for controlling It changes the time of element conductive, the charging output circuit includes resistance R4, resistance R5, diode D3, wherein one end of resistance R4 The pin 4 of charging chip is connected, one end of resistance R5 is connected to the pin 5 of charging chip, and one end of diode D3, which is connected to, to be filled The pin 1 of electrical chip, one end of the other end connection capacitor C2 of diode D3, the pin 6 of charging chip and resistance R4, R5's is another One end is grounded.
When the external charging power supply of connection works normally, external charging power supply at this time can provide a burning voltage and be Digital product power supply, just stops power supply after filling.If external charging power supply is sudden shut off, power supply will stop.Because electric Switching element, that is, metal-oxide-semiconductor Q1 in road has switching characteristic, and the source level of the metal-oxide-semiconductor Q1 connects external charging power supply, and drain connects One end i.e. output end of charging circuit for meeting capacitor C2, when the external charging power supply of connection is when charging process is cut off, metal-oxide-semiconductor Q1 will be in the conductive state, automatically switches to video camera internal battery powers.The conversion charged using inside and outside dual power supply, It is powered, can more efficiently be avoided in charging, external charging power supply is cut off to digital product institute using internal cell Bring damage.
The control switching circuit that the grid of metal-oxide-semiconductor Q1 is connected includes resistance R6, resistance R7, capacitor C3 and capacitor C4, Resistance R6, capacitor C3 one end connect respectively with one end of resistance R7, capacitor C4 after be connected to the grid of metal-oxide-semiconductor Q1, resistance R6 One end connected with one end of capacitor C3 after connect external input voltage, the other end of resistance R7 and the other end of capacitor C4 connect Ground.Entire control switching circuit is connected to the grid of metal-oxide-semiconductor Q1 again later in such a way that resistance is in parallel with capacitor.Using such Connection type can be improved the opening speed of metal-oxide-semiconductor Q1, thus control in the when marquis to the capacitor charging in control switching circuit Turn-on time has been made, so when external charge power supply is broken, metal-oxide-semiconductor Q1 can have been made quickly to be connected, accelerated in conversion The efficiency of portion's battery, so that entire circuit is more efficiently run.
In the charge circuit, draw after one end of light emitting diode D1, D2 is connect with one end of capacitor C1 with charging chip Foot 3 is connected, and 5V external voltage, light emitting diode are accessed in the common end between one end of capacitor C1 and one end of light emitting diode D1 The connection of the pin 3 of D1, D2 and input power and charging chip, display charging situation that can be more straightforward, the diode One end of D3 is connected to the output end of charging chip, and the other end reconnects one end of capacitor C2, the i.e. output point of charging circuit Capacitor C2 is connected, can so be stabilized the output voltage by diode D3, capacitor C2 is recycled to carry out the storage of electricity, convenient for entire The charge and discharge in circuit later period.Wherein charging chip model SC806.The pin 4 of one end connection charging chip of resistance R4, resistance One end of R5 is connected to the pin 5 of charging chip, and wherein resistance R4 and resistance R5 belongs to charging chip internal work needs, electricity So that the pin 4 of charging chip is eliminated original current limit after the other end ground connection of resistance R4, charging, resistance R5 can be fast implemented Other end ground connection after make charging chip during the charging process and can preferably complete the work for being pre-charged and terminating charging.
Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention, it is not limited to this Utility model, although the utility model is described in detail with reference to the foregoing embodiments, for those skilled in the art For, it is still possible to modify the technical solutions described in the foregoing embodiments, or to part of technical characteristic It is equivalently replaced.Within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on, It should be included within the scope of protection of this utility model.

Claims (4)

1. a kind of dual power supply switching circuit of video camera, it is characterised in that: including charging circuit and power supply switch circuit, institute State the charging input display circuit and charging output circuit that charging circuit includes charging chip and its connection, the power supply switching electricity Road includes switching element, energy-storage travelling wave tube and control switching circuit, and the switching element is connected to charging output circuit and switching is controlled Between circuit processed, for the on-off of control circuit, the energy-storage travelling wave tube is connect with charging output circuit and switching element, for electricity The charge and discharge of source switching circuit, the control switching circuit are connect with switching element and external input voltage, for controlling switching The time of element conductive, the charging output circuit include resistance R4, resistance R5, diode D3, and wherein one end of resistance R4 connects The pin 4 of charging chip is connect, one end of resistance R5 is connected to the pin 5 of charging chip, and one end of diode D3 is connected to charging The pin 1 of chip, one end of the other end connection capacitor C2 of diode D3, the pin 6 of charging chip and resistance R4, R5's is another End is grounded.
2. a kind of dual power supply switching circuit of video camera according to claim 1, it is characterised in that: the switching member Part is metal-oxide-semiconductor Q1, and energy-storage travelling wave tube is capacitor C2, and the source level of the metal-oxide-semiconductor Q1 connects external charging power supply, grid connection switching control Circuit processed, drain connect one end of capacitor C2, the other end ground connection of capacitor C2.
3. a kind of dual power supply switching circuit of video camera according to claim 1, it is characterised in that: the switching control Circuit processed includes resistance R6, resistance R7, capacitor C3, capacitor C4, wherein resistance R6, capacitor C3 one end respectively with resistance R7, electricity The grid of metal-oxide-semiconductor Q1 is connected to after one end connection of appearance C4, one end of resistance R6 connects external after connecting with one end of capacitor C3 Input voltage, the other end of resistance R7 and the other end of capacitor C4 are grounded.
4. a kind of dual power supply switching circuit of video camera according to claim 1, it is characterised in that: the charging is defeated Entering display circuit includes light emitting diode D1, light emitting diode D2, resistance R1, resistance R2, resistance R3 and capacitor C1, wherein shining One end of diode D1, D2 are connected after connecting with one end of capacitor C1 with the pin 3 of charging chip, one end of capacitor C1 and shine 5V external voltage is accessed in common end between one end of diode D1, and the other end of light emitting diode D1 connects the one of resistance R1 End, one end of the other end connection resistance R2 of light emitting diode D2, the pin 10 of the other end connection charging chip of resistance R1, electricity Hinder the pin 2 of the other end connection charging chip of R2, the pin 7 of one end connection charging chip of resistance R3, capacitor C1, resistance R3 The other end be grounded.
CN201821313826.3U 2018-08-15 2018-08-15 A kind of dual power supply switching circuit of video camera Active CN208548751U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201821313826.3U CN208548751U (en) 2018-08-15 2018-08-15 A kind of dual power supply switching circuit of video camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201821313826.3U CN208548751U (en) 2018-08-15 2018-08-15 A kind of dual power supply switching circuit of video camera

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111864887A (en) * 2020-07-21 2020-10-30 美唐科技(江苏)有限公司 Law enforcement appearance double cell circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111864887A (en) * 2020-07-21 2020-10-30 美唐科技(江苏)有限公司 Law enforcement appearance double cell circuit

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