CN104062919A - Circuit for controlling coil, device for controlling light filter and camera - Google Patents
Circuit for controlling coil, device for controlling light filter and camera Download PDFInfo
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- CN104062919A CN104062919A CN201410281174.XA CN201410281174A CN104062919A CN 104062919 A CN104062919 A CN 104062919A CN 201410281174 A CN201410281174 A CN 201410281174A CN 104062919 A CN104062919 A CN 104062919A
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Abstract
An embodiment of the invention provides a circuit for controlling a coil, a device for controlling a light filter and a camera. The circuit comprises a first subcircuit for controlling forward connection of the coil, a second subcircuit for controlling backward connection of the coil and a control signal input end, wherein a control signal input by the control signal input end is used for controlling the circuit to be in one of the three states including that the second subcircuit is disconnected when the first subcircuit is connected; the first subcircuit is disconnected when the second subcircuit is connected; the first subcircuit and the second subcircuit are disconnected at the same time. Under the control of the control signal, the circuit can be in the three states, therefore, the circuit is controlled to generate current when the coil works, the circuit is controlled to be disconnected after the coil finishes working, and power consumption and heat of the circuit are reduced.
Description
Technical field
The present invention relates to electronic technology field, and more specifically, relate to for the circuit of control coil, for controlling device and the video camera of optical filter.
Background technology
Along with the development of Video Surveillance Industry, the status of CCTV camera in daily production, life is more and more important.Video camera by day with all need to gather video image clearly night, camera lens and sensor can receive multi-wavelength's light wave.By day, camera lens light-inletting quantity is large, and the figure kine bias that infrared ray arrives camera acquisition is red.In order to reduce light-inletting quantity and to improve picture quality, need to increase optical filter with filtering infrared ray.At night, camera lens light-inletting quantity is little, need to remove optical filter to increase light-inletting quantity.
In prior art, control the switching of optical filter by infrared filter commutation circuit (or claiming IR_CUT circuit).IR_CUT circuit is a kind of coil control circuit, and this coil control circuit comprises two branch roads, and the forward conduction by control coil and reverse-conducting are realized the handoff functionality of optical filter respectively.Video camera needs work double tides conventionally, and existing coil control circuit can continuous consumed power in the time that video camera is worked, and thermal value is large.
Summary of the invention
It is a kind of for the circuit of control coil, for controlling device and the video camera of optical filter, to reduce power consumption and the thermal value of coil control circuit that the embodiment of the present invention provides.
First aspect, provides a kind of circuit for control coil, comprising: for controlling the first branch road of described coil forward conduction, described the first branch road comprises the first switching device of mutual series connection, described coil and second switch device; For controlling the second branch road of described coil reverse-conducting, described the second branch road comprises the 3rd switching device of mutual series connection, described coil and the 4th switching device; Act on the control signal input end of described the first switching device, second switch device, the 3rd switching device and the 4th switching device, wherein, the control signal of described control signal input end input is for controlling the one of described circuit in following three kinds of states: the in the situation that of described the first branch road conducting, described the second branch road disconnects; The in the situation that of described the second branch road conducting, described the first branch road disconnects; Disconnect with described the first branch road and described the second branch road simultaneously.
In conjunction with first aspect, in a kind of implementation of first aspect, described control signal input end comprises at least two ports, and described at least two ports are respectively used to receive separate control signal.
In conjunction with first aspect or its above-mentioned implementation any, in the another kind of implementation of first aspect, described the first switching device, second switch device, the 3rd switching device and the 4th switching device are transistor.
In conjunction with any of first aspect or its above-mentioned implementation, in the another kind of implementation of first aspect, described the first switching device and described the 3rd switching device are P type triode, and described second switch device and described the 4th switching device are N-type triode; Described control signal input end comprises: the first port, is connected with the base stage of described the 4th switching device with the base stage of described the first switching device respectively; The second port, is connected with the base stage of described the 3rd switching device with the base stage of described second switch device respectively; In described the first branch road, the emitter of described the first switching device is connected with the positive pole of the first power supply, the collector of described the first switching device is connected with the first end of described coil, the collector of described second switch device is connected with the second end of described coil, and the emitter of described second switch device is connected with the negative pole of described the first power supply; In described the second branch road, described the 3rd emitter of switching device and the positive pole of second source are connected, the collector of described the 3rd switching device is connected with the second end of described coil, described the 4th collector of switching device and the first end of described coil are connected, and described the 4th emitter of switching device and the negative pole of described second source are connected.
In conjunction with first aspect or its above-mentioned implementation any, in the another kind of implementation of first aspect, described the first port and described the second port are GPIO mouth.
In conjunction with any of first aspect or its above-mentioned implementation, in the another kind of implementation of first aspect, described the first switching device and described the 3rd switching device are PMOS pipe, described second switch device and described the 4th switching device are N-type triode, described control signal input end comprises: the 3rd port, is connected with the base stage of described second switch device; The 4th port, is connected with the base stage of described the 4th switching device; In described the first branch road, the source electrode of described the first switching device is connected with the positive pole of the first power supply, the drain electrode of described the first switching device is connected with the first end of described coil, the collector of described second switch device is connected with the grid of described the first switching device with the second end of described coil respectively, and the emitter of described second switch device is connected with the negative pole of described the first power supply; In described the second branch road, described the 3rd source electrode of switching device and the positive pole of second source are connected, the drain electrode of described the 3rd switching device is connected with the second end of described coil, the collector of described the 4th switching device is connected with the grid of described the 3rd switching device with the first end of described coil respectively, and described the 4th emitter of switching device and the negative pole of described second source are connected.
In conjunction with any of first aspect or its above-mentioned implementation, in the another kind of implementation of first aspect, described the first power supply is same power supply with described second source or is two identical power supplys of current potential.
In conjunction with first aspect or its above-mentioned implementation any, in the another kind of implementation of first aspect, the negative pole of described the first power supply and the negative pole of described second source are grounded.
In conjunction with any of first aspect or its above-mentioned implementation, in the another kind of implementation of first aspect, described coil is for controlling the movement of the Magnetic Induction element that is arranged on described coil, described in the time of described coil forward conduction the first moving direction of Magnetic Induction element be different from the time of described coil reverse-conducting described in the second moving direction of Magnetic Induction element, described Magnetic Induction element is coupled in camera lens for the ultrared optical filter of filtering.
Second aspect, provides a kind of and it is characterized in that for controlling the device of optical filter, comprising: the circuit as described in any of first aspect or its above-mentioned implementation; Be arranged on the Magnetic Induction element in described coil, described coil is for controlling the movement of the Magnetic Induction element that is arranged on described coil; Be coupled on described Magnetic Induction element for the ultrared optical filter of filtering, described in the time of described coil forward conduction the first moving direction of Magnetic Induction element be different from the time of described coil reverse-conducting described in the second moving direction of Magnetic Induction element, to make described Magnetic Induction element drive respectively described optical filter to move along different directions when described coil forward conduction and the reverse-conducting.
The third aspect, provides a kind of video camera, comprising: camera lens; Device as described in second aspect, described device moves for control described optical filter in the situation that of described coil forward conduction, what make camera lens described in the filter coating partial occlusion of optical filter enters light path line, the in the situation that of described coil reverse-conducting, control described optical filter and move, what make that the filter coating part of described optical filter avoids described camera lens enters light path line.
In the embodiment of the present invention, under the control of control signal, can make circuit in above-mentioned three kinds of states, thereby in the time of needs coil working, control circuit generation current; After coil working finishes, control circuit disconnects, and has reduced power consumption and the heat of circuit.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, to the accompanying drawing of required use in the embodiment of the present invention be briefly described below, apparently, described accompanying drawing is only some embodiments of the present invention below, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit diagram of the circuit for control coil of one embodiment of the invention.
Fig. 2 is the circuit diagram of the circuit for control coil of one embodiment of the invention.
Fig. 3 be one embodiment of the invention for controlling the schematic block diagram of device of optical filter.
Fig. 4 is the schematic block diagram of the video camera of one embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, instead of whole embodiment.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, should belong to the scope of protection of the invention.
Existing IR_CUT circuit power consumption is high, and thermal value is large, traces it to its cause, relevant with the circuit topology of IR_CUT circuit.Particularly, in IR_CUT circuit, the break-make of two branch roads is by a control signal control, in the time that this control signal is high level, and the first branch road conducting, the second branch road disconnects; In the time that control signal is low level, the first branch road disconnects, the second branch road conducting.In other words, no matter control signal is high level or low level, always has a branch road in conducting state in the first branch road and the second branch road.Can produce so a large amount of power consumptions and heat.
In order to address the above problem, the embodiment of the present invention provides a kind of circuit for control coil, this circuit only in the time of needs coil working (for example, need to carry out optical filter switching by control coil time) generation current, coil working (for example finishes afterwards, after optical filter has switched) make circuit in off-state, reduce power consumption and the thermal value of circuit.Below in conjunction with Fig. 1 and Fig. 2, describe in detail according to the circuit for control coil of the embodiment of the present invention.
Referring to Fig. 1 and Fig. 2, circuit 100 for control coil E1 comprises: for first branch road 110 (schematic diagram in Fig. 1 or 2 left sides) of control coil E1 forward conduction, the first branch road 110 comprises the first switching device Q1, coil E1 and the second switch device Q2 of mutual series connection; For second branch road 120 (schematic diagram on Fig. 1 or 2 right sides) of control coil E1 reverse-conducting, the second branch road 120 comprises the 3rd switching device Q3, coil E1 and the 4th switching device Q4 of mutual series connection; Act on the control signal input end of the first switching device Q1, second switch device Q2, the 3rd switching device Q3 and the 4th switching device Q4, wherein, the control signal of control signal input end input is used for the one of control circuit 100 in following three kinds of states: the in the situation that of the first branch road 110 conducting, the second branch road 120 disconnects; The in the situation that of the second branch road 120 conducting, the first branch road 110 disconnects; Disconnect with the first branch road 110 and the second branch road 120 simultaneously.
In the embodiment of the present invention, under the control of control signal, can make circuit in above-mentioned three kinds of states, thereby in the time of needs coil working, control circuit generation current; After coil working finishes, control circuit disconnects, and has reduced power consumption and the heat of circuit.
The forward conduction that should be understood that coil E1 is a relative concept with reverse-conducting.2 terminals supposing coil E1 are: terminals 1 and terminals 2, if definition electric current flows to the forward conduction of terminals 2 for coil from the terminals 1 of coil E1, electric current flows to the reverse-conducting of terminals 1 for coil from the terminals 2 of coil E1.If definition electric current flows to the forward conduction of terminals 1 for coil from the terminals 2 of coil E1, electric current flows to the reverse-conducting of terminals 2 for coil from the terminals 1 of coil E1.
Should understand, above-mentioned control signal input end acts on the first switching device Q1, second switch device Q2, the 3rd switching device Q3 and the 4th switching device Q4, only represent that this control signal input end has the function of controlling above-mentioned 4 switching devices, not represent that this control signal input end and this 4 switching devices necessarily exist direct annexation, in reality, control signal input end can directly be connected with these 4 switching devices, thereby directly controls this 4 switching devices; Or control signal input end can be connected with 2 switching devices wherein, by controlling this 2 switching devices, indirectly control 2 switching devices of residue.
Alternatively, as an embodiment, control signal input end can comprise at least two ports, and these at least two ports are respectively used to receive separate control signal.In other words, control signal input end, under the control of this separate control signal, can make circuit 100 in above-mentioned three kinds of states.
In the embodiment of the present invention, under the Collaborative Control of multiple separate control signals, circuit 100 can be in above-mentioned three kinds of states, thereby in the time of needs coil working, control circuit generation current; After coil working finishes, control circuit disconnects, and has reduced power consumption and the heat of circuit.
Particularly, as shown in Figure 1, above-mentioned control signal input end is the first port C1 and the second port C2.Wherein, the first port C1 is connected with the base stage B of the 4th switching device Q4 with the first switching device Q1 respectively; The second port C2 is connected with the base stage B of the 3rd switching device Q3 with second switch device Q2 respectively.Above-mentioned separate control signal is two control signals, inputs for one from the first port C1, and another is inputted from the second port C2.When the first port C1 input low level, when the second port C2 input high level, circuit 100 is in the first branch road 110 conductings, the state that the second branch road 120 disconnects; When the first port C1 input high level, when the second port C2 input low level, circuit 100 in: the first branch road 110 disconnects, the state of the second branch road 120 conductings; When the first port C1 and the second port C2 are simultaneously when input high level or low level, circuit 100 is in the state that the first branch road 110 and the second branch road 120 disconnect simultaneously.
Lift an example, as shown in Figure 2, above-mentioned control signal input end is the 3rd port C3 and the 4th port C4 again.Wherein, the 3rd port C3 is connected with the base stage B of second switch device Q2, and the 4th port C4 is connected with the base stage B of the 4th switching device Q4.Above-mentioned separate control signal is two control signals, inputs for one from the 3rd port C3, and another is inputted from the 4th port C4.When the 3rd port C3 input high level, when the 4th port C4 input low level, circuit 100 is in the first branch road 110 conductings, the state that the second branch road 120 disconnects; When the 3rd port C3 input low level, when the 4th port C4 input high level, circuit 100 in: the first branch road 110 disconnects, the state of the second branch road 120 conductings; When the 3rd port C3 and the 4th port C4 are simultaneously when input low level, circuit 100 is in the state that the first branch road 110 and the second branch road 120 disconnect simultaneously.
Should be understood that above-mentioned switching device can be triode, metal-oxide semiconductor (MOS) (Metal OxideSemiconductor, MOS) pipe, optical coupled switch, relay etc.
Alternatively, as an embodiment, referring to Fig. 1, in circuit 100, the first switching device Q1 and the 3rd switching device Q3 are P type triode, and second switch device Q2 and the 4th switching device Q4 are N-type triode; Control signal input end comprises: the first port C1, is connected with the base stage B of the 4th switching device Q4 with the base stage B of the first switching device Q1 respectively; The second port C2, is connected with the base stage B of the 3rd switching device Q3 with the base stage B of second switch device Q2 respectively; In the first branch road 110, the emitter E of the first switching device Q1 is connected with the positive pole of the first power supply VCC1, the collector C of the first switching device Q1 is connected with the first end of coil E1, the collector C of second switch device Q2 is connected with the second end of coil E1, and the emitter E of second switch device Q2 is connected with the negative pole (earth potential) of the first power supply VCC1; In the second branch road 120, the emitter E of the 3rd switching device Q3 is connected with the positive pole of second source VCC2, the collector C of the 3rd switching device Q3 is connected with the second end of coil E1, the collector C of the 4th switching device Q4 is connected with the first end of coil E1, and the emitter E of the 4th switching device Q4 is connected with the negative pole (earth potential) of second source VCC2.
Further, above-mentioned the first power supply VCC1 can be identical with second source VCC2, and above-mentioned the first port C1 and the second port C2 can be universal input output (General Purpose Input Output, GPIO) mouthful.
Alternatively, as an embodiment, referring to Fig. 2, in circuit 100, the first switching device Q1 and the 3rd switching device Q3 are P-channel metal-oxide-semiconductor (P-channel MOS, PMOS) pipe, and second switch device Q2 and the 4th switching device Q4 are N-type triode, control signal input end comprises: the 3rd port C3, is connected with the base stage B of second switch device Q2; The 4th port C4, is connected with the base stage B of the 4th switching device Q4; In the first branch road 110, the source S of the first switching device Q1 is connected with the positive pole of the first power supply VCC1, the drain D of the first switching device Q1 is connected with the first end of coil E1, the collector C of second switch device Q2 is connected with the grid G of the first switching device Q1 with the second end of coil E1 respectively, and the emitter E of second switch device Q2 is connected with the negative pole (earth potential) of the first power supply VCC1; In the second branch road 120, the source S of the 3rd switching device Q3 is connected with the positive pole of second source VCC2, the drain D of the 3rd switching device Q3 is connected with the second end of coil E1, the collector C of the 4th switching device Q4 is connected with the grid G of the 3rd switching device Q3 with the first end of coil E1 respectively, and the emitter E of the 4th switching device Q4 is connected with the negative pole (earth potential) of second source VCC2.
The negative pole of each power supply is made as earth potential (ground connection) in the above-described embodiments, in specific implementation, can be certainly other current potentials as negative potential, the present embodiment is not restricted this.
Alternatively, as an embodiment, coil E1 is for controlling the movement of the Magnetic Induction element that is arranged on coil, in the time of coil E1 forward conduction, the first moving direction of Magnetic Induction element is different from the second moving direction of Magnetic Induction element in the time of coil E1 reverse-conducting, and Magnetic Induction element is fixed in camera lens for the ultrared optical filter of filtering.Certainly between Magnetic Induction element and optical filter, can adopt detachable or pluggable annexation, needn't be completely fixed, as long as Magnetic Induction element and optical filter exist coupled relation to make optical filter to move and just can reach the effect that the present embodiment is mentioned with the motion of Magnetic Induction element.
Particularly, this optical filter can comprise two parts: a part of surface is provided with filter coating, for filtering infrared ray; Another part is glass sheet, when light passes through this glass sheet part, and can be by filtering.In the time that needs filter, first to control signal input end input control signal, control the first branch road 110 conductings, the second branch road 120 disconnects, coil E1 forward conduction, produce magnetic field, drive optical filter to move thereby control Magnetic Induction element, make optical filter filter coating partial occlusion camera lens enter light path line; Then,, in the time that filter coating shelters from camera lens, disconnect by control signal control the first branch road 110 and the second branch road 120 simultaneously.In the time not needing to filter, first to control signal input end input control signal, control that the first branch road 110 disconnects, the second branch road 120 conductings, coil E1 reverse-conducting, produce magnetic field, drive optical filter to move thereby control Magnetic Induction element, make optical filter glass sheet partial occlusion camera lens enter light path line; Then,, in the time that glass sheet shelters from camera lens, disconnect by control signal control the first branch road 110 and the second branch road 120 simultaneously.
In the embodiment of the present invention, in the time that needs are installed optical filter for camera lens, control optical filter and move, enter the infrared ray of camera lens with filtering, move into place rear disconnecting circuit; When without installing when optical filter for camera lens, control optical filter moves, make infrared ray enter camera lens, move into place rear disconnecting circuit, thereby only have and need to control optical filter and move time, in circuit, have electric current and flow through, while movement without optical filter, the state of circuit in disconnecting, has reduced power consumption and the thermal value of whole circuit.
Describe the circuit for control coil according to the embodiment of the present invention in detail in conjunction with Fig. 1 and Fig. 2 above.Below in conjunction with Fig. 3, describe in detail according to the embodiment of the present invention for controlling the device of optical filter.The device that should be understood that this control optical filter comprises the circuit for control coil mentioned above, for avoiding repetition, no longer describes in detail herein.
Fig. 3 be one embodiment of the invention for controlling the schematic block diagram of device of optical filter.Device 300 comprises: circuit 100; Be arranged on the Magnetic Induction element 310 in coil E1, coil E1 is for controlling the movement of the Magnetic Induction element that is arranged on coil E1; Be coupled on Magnetic Induction element 310 for the ultrared optical filter 320 of filtering, in the time of coil E1 forward conduction, the first moving direction of Magnetic Induction element is different from the second moving direction of Magnetic Induction element in the time of coil E1 reverse-conducting, to make Magnetic Induction element 310 drive respectively optical filter 320 to move along different directions when coil E1 forward conduction and the reverse-conducting.
In the embodiment of the present invention, in the time that needs are installed optical filter for camera lens, control optical filter and move, enter the infrared ray of camera lens with filtering, move into place rear disconnecting circuit; When without installing when optical filter for camera lens, control optical filter moves, make infrared ray enter camera lens, move into place rear disconnecting circuit, thereby only have and need to control optical filter and move time, in circuit, have electric current and flow through, while movement without optical filter, the state of circuit in disconnecting, has reduced power consumption and the thermal value of whole circuit.
Above in conjunction with Fig. 1-Fig. 3 describe in detail according to the embodiment of the present invention for the circuit of control coil with for controlling the device of optical filter.Below, in conjunction with Fig. 4, describe in detail according to the video camera of the embodiment of the present invention.Should be understood that this video camera comprises mentioned above for controlling the device of optical filter, for avoiding repetition, no longer describe in detail herein.
Fig. 4 is the schematic block diagram of the video camera of one embodiment of the invention.The video camera 400 of Fig. 4 comprises: camera lens 410; For controlling the device 300 of optical filter, device 300 moves for controlling optical filter 320 the coil E1 forward conduction in the situation that, make optical filter 320 filter coating partial occlusion camera lens 410 enter light path line, the in the situation that of coil E1 reverse-conducting, control optical filter 320 and move, what make that the filter coating part of optical filter 320 avoids camera lens 410 enters light path line.
Particularly, this optical filter 320 can comprise two parts: a part of surface is provided with filter coating, for filtering infrared ray; Another part is glass sheet, when light passes through this glass sheet part, and can be by filtering.In the time that needs filter, first to control signal input end input control signal, control the first branch road 110 conductings, the second branch road 120 disconnects, coil E1 forward conduction, produce magnetic field, drive optical filter 320 to move thereby control Magnetic Induction element, make optical filter 320 filter coating partial occlusion camera lens 410 enter light path line; Then,, in the time that filter coating shelters from camera lens 410, disconnect by control signal control the first branch road 110 and the second branch road 120 simultaneously.In the time not needing to filter, first to control signal input end input control signal, control that the first branch road 110 disconnects, the second branch road 120 conductings, coil E1 reverse-conducting, produce magnetic field, drive optical filter 320 to move thereby control Magnetic Induction element, make optical filter 320 glass sheet partial occlusion camera lens 410 enter light path line; Then,, in the time that glass sheet shelters from camera lens, disconnect by control signal control the first branch road 110 and the second branch road 120 simultaneously.
In the embodiment of the present invention, in the time that needs are installed optical filter for camera lens, control optical filter and move, enter the infrared ray of camera lens with filtering, move into place rear disconnecting circuit; When without installing when optical filter for camera lens, control optical filter moves, make infrared ray enter camera lens, move into place rear disconnecting circuit, thereby only have and need to control optical filter and move time, in circuit, have electric current and flow through, while movement without optical filter, the state of circuit in disconnecting, has reduced power consumption and the thermal value of whole circuit.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, any be familiar with those skilled in the art the present invention disclose technical scope in; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection domain of claim.
Claims (10)
1. for a circuit for control coil, it is characterized in that, comprising:
For controlling the first branch road of described coil forward conduction, described the first branch road comprises the first switching device of mutual series connection, described coil and second switch device;
For controlling the second branch road of described coil reverse-conducting, described the second branch road comprises the 3rd switching device of mutual series connection, described coil and the 4th switching device;
Act on the control signal input end of described the first switching device, second switch device, the 3rd switching device and the 4th switching device, wherein, the control signal of described control signal input end input is for controlling the one of described circuit in following three kinds of states:
The in the situation that of described the first branch road conducting, described the second branch road disconnects;
The in the situation that of described the second branch road conducting, described the first branch road disconnects; With
Described the first branch road and described the second branch road disconnect simultaneously.
2. circuit as claimed in claim 1, is characterized in that, described control signal input end comprises at least two ports, and described at least two ports are respectively used to receive separate control signal.
3. circuit as claimed in claim 1 or 2, is characterized in that, described the first switching device, second switch device, the 3rd switching device and the 4th switching device are transistor.
4. the circuit as described in any one in claim 1-3, is characterized in that,
Described the first switching device and described the 3rd switching device are P type triode, and described second switch device and described the 4th switching device are N-type triode;
Described control signal input end comprises:
The first port, is connected with the base stage of described the 4th switching device with the base stage of described the first switching device respectively;
The second port, is connected with the base stage of described the 3rd switching device with the base stage of described second switch device respectively;
In described the first branch road, the emitter of described the first switching device is connected with the positive pole of the first power supply, the collector of described the first switching device is connected with the first end of described coil, the collector of described second switch device is connected with the second end of described coil, and the emitter of described second switch device is connected with the negative pole of described the first power supply;
In described the second branch road, described the 3rd emitter of switching device and the positive pole of second source are connected, the collector of described the 3rd switching device is connected with the second end of described coil, described the 4th collector of switching device and the first end of described coil are connected, and described the 4th emitter of switching device and the negative pole of described second source are connected.
5. the circuit as described in any one in claim 1-3, is characterized in that, described the first switching device and described the 3rd switching device are P-channel metal-oxide-semiconductor PMOS pipe, and described second switch device and described the 4th switching device are N-type triode,
Described control signal input end comprises:
The 3rd port, is connected with the base stage of described second switch device;
The 4th port, is connected with the base stage of described the 4th switching device;
In described the first branch road, the source electrode of described the first switching device is connected with the positive pole of the first power supply, the drain electrode of described the first switching device is connected with the first end of described coil, the collector of described second switch device is connected with the grid of described the first switching device with the second end of described coil respectively, and the emitter of described second switch device is connected with the negative pole of described the first power supply;
In described the second branch road, described the 3rd source electrode of switching device and the positive pole of second source are connected, the drain electrode of described the 3rd switching device is connected with the second end of described coil, the collector of described the 4th switching device is connected with the grid of described the 3rd switching device with the first end of described coil respectively, and described the 4th emitter of switching device and the negative pole of described second source are connected.
6. the circuit as described in claim 4 or 5, is characterized in that, described the first power supply is same power supply with described second source or is two identical power supplys of current potential.
7. the circuit as described in any one in claim 4-6, is characterized in that, the negative pole of described the first power supply and the negative pole of described second source are grounded.
8. the circuit as described in any one in claim 1-7, it is characterized in that, described coil is for controlling the movement of the Magnetic Induction element that is arranged on described coil, described in the time of described coil forward conduction the first moving direction of Magnetic Induction element be different from the time of described coil reverse-conducting described in the second moving direction of Magnetic Induction element, described Magnetic Induction element is coupled in camera lens for the ultrared optical filter of filtering.
9. for controlling a device for optical filter, it is characterized in that, comprising:
Circuit as described in any one in claim 1-7;
Be arranged on the Magnetic Induction element in described coil, described coil is for controlling the movement of the Magnetic Induction element that is arranged on described coil;
Be coupled on described Magnetic Induction element for the ultrared optical filter of filtering, described in the time of described coil forward conduction the first moving direction of Magnetic Induction element be different from the time of described coil reverse-conducting described in the second moving direction of Magnetic Induction element, to make described Magnetic Induction element drive respectively described optical filter to move along different directions when described coil forward conduction and the reverse-conducting.
10. a video camera, is characterized in that, comprising:
Camera lens;
As claimed in claim 9 for controlling the device of optical filter, described device moves for control described optical filter in the situation that of described coil forward conduction, what make camera lens described in the filter coating partial occlusion of optical filter enters light path line, the in the situation that of described coil reverse-conducting, control described optical filter and move, what make that the filter coating part of described optical filter avoids described camera lens enters light path line.
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| CN201410281174.XA CN104062919A (en) | 2014-06-20 | 2014-06-20 | Circuit for controlling coil, device for controlling light filter and camera |
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| CN201410281174.XA CN104062919A (en) | 2014-06-20 | 2014-06-20 | Circuit for controlling coil, device for controlling light filter and camera |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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