CN203014706U

CN203014706U - Power supply device with high efficiency alternating current and direct current same port input for cameras

Info

Publication number: CN203014706U
Application number: CN 201220729487
Authority: CN
Inventors: 黄中元
Original assignee: Quanzhou Southeast Photoelectric Co Ltd
Current assignee: Quanzhou Southeast Photoelectric Co., Ltd.
Priority date: 2012-12-25
Filing date: 2012-12-25
Publication date: 2013-06-19
Anticipated expiration: 2022-12-25

Abstract

A power supply device with a high efficiency alternating current and direct current same port input for cameras comprises an AC-DC single-arm non-voltage drop bridge-type rectification circuit and a direct current electronic switching circuit which share the same input port, and also comprises an input state detecting circuit which is connected with the input port and an output voltage adjustment circuit which adjusts output voltages of the AC-DC single-arm non-voltage drop bridge-type rectification circuit and the direct current electronic switching circuit into output voltage available for the cameras. The AC-DC single-arm non-voltage drop bridge-type rectification circuit and the direct current electronic switching circuit are both electrically connected with the output voltage adjustment circuit. One bridge arm of the AC-DC single-arm non-voltage drop bridge-type rectification circuit adopts a field effect transistor. The power supply device is available for alternating current and direct current, inputs alternating current and direct current through the same port, can better meet on-site requirements of a user, and is wide in application range, convenient to use, small in voltage attenuation, small in loss, high in conversion efficiency, energy-saving, environment-friendly, and high in working reliability.

Description

A kind of efficient AC and DC for video camera is with the supply unit of port input

Technical field

The utility model relates to a kind of supply unit, and particularly a kind of efficient AC and DC for video camera is with the supply unit of port input.

Background technology

At present, existing widely used camera power supply device is generally AC-DC DC power supply or DC-DC DC power supply, in some specific occasion, is difficult to satisfy user's field demand, and range of application is limited.it is more extensive more convenient for same supply unit is used, supply unit that AC-DC DC power supply and DC-DC DC power supply are united two into one has appearred, AC separates independent the setting with the input port of DC, need during use to select different input ports according to input signal, it is convenient not to use, and existing AC-DC DC power supply is generally carried out AC-DC conversion by the rectification circuit that is constituted by a diode, though can obtain direct voltage after conversion, but voltage attenuation is excessive, loss is large, conversion efficiency is low, not only waste energy, and possibly can't start the stricter equipment of voltage request for some and make its normal operation.

The utility model content

Main purpose of the present utility model is the shortcoming that overcomes prior art, but provide a kind of AC and DC to share, and AC and DC inputs with port, can better meet user's field demand, range of application is wider, use more conveniently, simultaneously, voltage attenuation is little, loss is little, conversion efficiency is high, more energy-conserving and environment-protective, and the higher efficient AC and DC that is used for video camera of functional reliability is with the supply unit of port input.

The utility model adopts following technical scheme:

a kind of efficient friendship for video camera, direct current is with the supply unit of port input, include the AC-DC single armed of shared same input port without pressure drop bridge rectifier and electronic DC switch circuit, also include the input state circuit for detecting that is connected in input port and be used for the AC-DC single armed is adjusted into without the output voltage of pressure drop bridge rectifier and electronic DC switch circuit the output voltage Circuit tuning of video camera voltage available, described AC-DC single armed is electrically connected on voltage-regulating circuit without the pressure drop bridge rectifier by the AC-DC electronic switch, described input state circuit for detecting is electrically connected on respectively electronic DC switch circuit and AC-DC electronic switch, described electronic DC switch circuit is electrically connected to the output voltage Circuit tuning, the output of described electronic DC switch circuit and output voltage Circuit tuning is connected in output port, described AC-DC single armed adopts field effect transistor without a wherein brachium pontis of pressure drop bridge rectifier.

Described AC-DC single armed consists of respectively four brachium pontis without the pressure drop bridge rectifier by three diodes and a field effect transistor, and described AC-DC single armed is without also being connected with filter circuit between pressure drop bridge rectifier and AC-DC electronic switch.

Described electronic DC switch circuit adopts two field effect transistor as electronic switch.

The DC-DC switch reduction voltage circuit that described output voltage Circuit tuning includes voltage comparator circuit, be electrically connected to voltage comparator circuit and be connected in output electronic switch between DC-DC switch reduction voltage circuit and output port, described voltage comparator circuit is electrically connected to the output electronic switch.

Described AC-DC electronic switch is electrically connected to DC-DC switch reduction voltage circuit input, and when being input as AC signal, the AC-DC single armed directly carries out exporting by output port after voltage is adjusted through DC-DC switch reduction voltage circuit without the output signal of pressure drop bridge rectifier.

Described electronic DC switch circuit is electrically connected to voltage comparator circuit, when being input as direct current signal, if the output voltage of electronic DC switch circuit is during greater than the setting threshold of voltage comparator circuit, input signal carries out exporting by output port after step-down through DC-DC switch reduction voltage circuit again; Otherwise, directly export by output port.

Described input port can be inputted AC24V or DC12V work.

By above-mentioned to description of the present utility model as can be known, compared with prior art, the beneficial effects of the utility model are: but AC and DC shares, and AC and DC is inputted with port, can better meet user's field demand, and range of application is wider, use more convenient, simultaneously, due to the wherein brachium pontis employing field effect transistor of AC-DC single armed without the pressure drop bridge rectifier, so voltage attenuation is little, loss is little, conversion efficiency is high, more energy-conserving and environment-protective, and functional reliability is higher.

Description of drawings

Fig. 1 is the theory diagram of the utility model embodiment;

Fig. 2 is the circuit diagram of the utility model embodiment.

In figure: 1. input port, 2.AC-DC single armed be without the pressure drop bridge rectifier, 3. the electronic DC switch circuit, 4. input state circuit for detecting, 5.AC-DC electronic switch, 6. output port, 7. voltage comparator circuit, 8.DC-DC switch reduction voltage circuit, 9. output electronic switch.

Embodiment

Below the utility model will be further described by embodiment.

see figures.1.and.2, a kind of efficient friendship for video camera of the present utility model, direct current is with the supply unit of port input, include the AC-DC single armed of shared same input port 1 without pressure drop bridge rectifier 2 and electronic DC switch circuit 3, also include the input state circuit for detecting 4 that is connected in input port 1 and be used for the AC-DC single armed is adjusted into without the output voltage of pressure drop bridge rectifier 2 and electronic DC switch circuit 3 the output voltage Circuit tuning of video camera voltage available, described AC-DC single armed is electrically connected on voltage-regulating circuit without pressure drop bridge rectifier 2 by AC-DC electronic switch 5, described input state circuit for detecting 4 is electrically connected on respectively electronic DC switch circuit 3 and AC-DC electronic switch 5, described electronic DC switch circuit 3 is electrically connected to the output voltage Circuit tuning, the output of described electronic DC switch circuit 3 and output voltage Circuit tuning is connected in output port 6.Described input port 1 can be inputted AC24V or DC12V work.

See figures.1.and.2, the DC-DC switch reduction voltage circuit 8 that described output voltage Circuit tuning includes voltage comparator circuit 7, be electrically connected to voltage comparator circuit 7 and be connected in output electronic switch 9 between DC-DC switch reduction voltage circuit 8 and output port 6, described voltage comparator circuit 7 is electrically connected to output electronic switch 9.

See figures.1.and.2, described AC-DC single armed consists of respectively four brachium pontis without pressure drop bridge rectifier 2 by three diode D1, D2, D3 and a field effect transistor T1, and described AC-DC single armed is without also being connected with filter circuit between pressure drop bridge rectifier 2 and AC-DC electronic switch 5.Described AC-DC electronic switch 5 is electrically connected to DC-DC switch reduction voltage circuit 8 inputs, when being input as AC signal, the AC-DC single armed directly carries out exporting by output port 6 after voltage is adjusted through DC-DC switch reduction voltage circuit 8 without the output signal of pressure drop bridge rectifier 2.

See figures.1.and.2, described electronic DC switch circuit 3 adopts two field effect transistor T2 and T3 as electronic switch.Described electronic DC switch circuit 2 is electrically connected to voltage comparator circuit 7, when being input as direct current signal, if the output voltage of electronic DC switch circuit 3 is during greater than the setting threshold of voltage comparator circuit 7, input signal after DC-DC switch reduction voltage circuit 8 carries out step-down again by output port 6 outputs; Otherwise, directly by output port 6 outputs.

See figures.1.and.2, described input state circuit for detecting 4 is made of diode D4 and capacitor C 1.Described AC-DC electronic switch 5 is field effect transistor T4, and described output electronic switch 9 is field effect transistor T5.Described DC-DC switch reduction voltage circuit 8 is made of commutator transformer X1, inductance L 1, diode D5, electrochemical capacitor C2, C3 and capacitor C 4.

See figures.1.and.2, a kind of efficient AC and DC for video camera of the present utility model is with the supply unit of port input, when being input as direct current signal, input signal is after electronic DC switch circuit 3, compare by voltage comparator circuit 7, if output voltage is during less than or equal to DC13.2V, directly by output port 6 outputs; Otherwise, if output voltage during greater than DC13.2V, again by output port 6 outputs, makes stable output in DC11.8 ± 0.3V after DC-DC switch reduction voltage circuit 8 carries out step-down.When being input as AC signal, input signal is after the AC-DC single armed carries out rectifying and wave-filtering without pressure drop bridge rectifier 2 and filter circuit, directly carry out exporting by output port 6 again after voltage is adjusted through DC-DC switch reduction voltage circuit 8, make stable output in DC11.8 ± 0.3V.

The utility model output voltage stabilization is in DC12.2 ± 1V, and output current directly by output port 6 output the time, can obtain the conversion efficiency greater than 99% less than or equal to 500mA.

Above-mentioned is only an embodiment of the present utility model, but design concept of the present utility model is not limited to this, allly utilizes this design to carry out the change of unsubstantiality to the utility model, all should belong to the behavior of invading the utility model protection range.

Claims

1. efficient friendship that is used for video camera, direct current is with the supply unit of port input, it is characterized in that: include the AC-DC single armed of shared same input port without pressure drop bridge rectifier and electronic DC switch circuit, also include the input state circuit for detecting that is connected in input port and be used for the AC-DC single armed is adjusted into without the output voltage of pressure drop bridge rectifier and electronic DC switch circuit the output voltage Circuit tuning of video camera voltage available, described AC-DC single armed is electrically connected on voltage-regulating circuit without the pressure drop bridge rectifier by the AC-DC electronic switch, described input state circuit for detecting is electrically connected on respectively electronic DC switch circuit and AC-DC electronic switch, described electronic DC switch circuit is electrically connected to the output voltage Circuit tuning, the output of described electronic DC switch circuit and output voltage Circuit tuning is connected in output port, described AC-DC single armed adopts field effect transistor without a wherein brachium pontis of pressure drop bridge rectifier.

2. a kind of efficient AC and DC for video camera as claimed in claim 1 is with the supply unit of port input, it is characterized in that: described AC-DC single armed consists of respectively four brachium pontis without the pressure drop bridge rectifier by three diodes and a field effect transistor, and described AC-DC single armed is without also being connected with filter circuit between pressure drop bridge rectifier and AC-DC electronic switch.

3. a kind of efficient AC and DC for video camera as claimed in claim 1 with the supply unit of port input, is characterized in that: described electronic DC switch circuit adopts two field effect transistor as electronic switch.

4. a kind of efficient AC and DC for video camera as claimed in claim 1 is with the supply unit of port input, it is characterized in that: the DC-DC switch reduction voltage circuit that described output voltage Circuit tuning includes voltage comparator circuit, be electrically connected to voltage comparator circuit and be connected in output electronic switch between DC-DC switch reduction voltage circuit and output port, described voltage comparator circuit is electrically connected to the output electronic switch.

5. a kind of efficient AC and DC for video camera as claimed in claim 4 is with the supply unit of port input, it is characterized in that: described AC-DC electronic switch is electrically connected to DC-DC switch reduction voltage circuit input, when being input as AC signal, the AC-DC single armed directly carries out exporting by output port after voltage is adjusted through DC-DC switch reduction voltage circuit without the output signal of pressure drop bridge rectifier.

6. a kind of efficient AC and DC for video camera as claimed in claim 4 is with the supply unit of port input, it is characterized in that: described electronic DC switch circuit is electrically connected to voltage comparator circuit, when being input as direct current signal, if the output voltage of electronic DC switch circuit is during greater than the setting threshold of voltage comparator circuit, input signal carries out exporting by output port after step-down through DC-DC switch reduction voltage circuit again; Otherwise, directly export by output port.

7. a kind of efficient AC and DC for video camera as claimed in claim 1 with the supply unit of port input, is characterized in that: described input port can be inputted AC24V or DC12V work.