CN201585033U - Isolating driving circuit for remote sensing CCD camera - Google Patents
Isolating driving circuit for remote sensing CCD camera Download PDFInfo
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- CN201585033U CN201585033U CN2009202467728U CN200920246772U CN201585033U CN 201585033 U CN201585033 U CN 201585033U CN 2009202467728 U CN2009202467728 U CN 2009202467728U CN 200920246772 U CN200920246772 U CN 200920246772U CN 201585033 U CN201585033 U CN 201585033U
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- 239000003990 capacitor Substances 0.000 claims description 30
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Abstract
The utility model relates to an isolating driving circuit for a remote sensing CCD camera, which comprises a voltage conversion circuit, an opto-coupler isolating circuit and a CMOS driving device circuit. The voltage conversion circuit carries out voltage conversion on an input power to establish a novel voltage reference system and supplies power to the opto-coupler isolating circuit after conversion. A time sequence pulse signal is first subjected to signal isolation by the opto-coupler isolating circuit to obtain a signal meeting the input requirement of a CMOS driving device, and then obtains a driving pulse signal of which a voltage and a power meet the working requirement of the CCD device by the CMOS driving device circuit. By increasing a power conversion circuit and the opto-coupler isolating circuit on the basis of the CMOS driving device circuit, on one hand, the isolating driving circuit for the remote sensing CCD camera makes the CMOS driving device which can only output a positive level driving signal capable of outputting positive and negative level driving signals, on the other hand, can make an output driving signal level of the CMOS driving device meet the requirement after the CMOS driving device with positive and negative level outputs is converted by the voltage reference system, thereby enlarging the using range of the CMOS driving device.
Description
Technical field
The utility model relates to a kind of isolated drive circuit that is used for remote sensing CCD camera.
Background technology
The drive signal that the work of CCD device is required, its high and low level value should satisfy particular requirement, and enough power drive abilities can be provided.At present, the general method for designing of CCD phase drive circuit is directly to select the design of cmos driver spare for use, only comprise cmos driver spare circuit in the circuit, the weak point of sort circuit is: the voltage range of cmos driver spare output signal is limited, behind selected certain cmos driver spare, the voltage range of its output signal has just been determined, and the voltage kind of the required drive signal of CCD device work is more, if every kind of drive signal is all only used cmos driver spare circuit design, then can cause required cmos driver spare kind to increase, even can't find the cmos driver spare that meets the demands.
The utility model content
Technology of the present utility model is dealt with problems and is: overcome the deficiencies in the prior art, provide a kind of widely applicable, the remote sensing CCD camera isolated drive circuit of multiple drive signal can be provided flexibly.
Technical solution of the present utility model is: the remote sensing CCD camera isolated drive circuit, comprise voltage conversion circuit, optical coupling isolation circuit, cmos driver spare circuit, voltage conversion circuit wherein: utilize the linear DC voltage-stabilizing device that the DC power supply of outside input is carried out voltage transitions, the required power supply of optocoupler work in the optical coupling isolation circuit is provided; Optical coupling isolation circuit: receive the outside time sequential pulse signal of sending into, utilize optocoupler to carry out Signal Spacing after, offer cmos driver spare circuit; Cmos driver spare circuit: receive the pulse signal after Signal Spacing that optical coupling isolation circuit is sent into, carry out voltage transitions and power drive, obtain drive signal and offer the CCD device by cmos driver spare.
Described voltage conversion circuit comprises capacitor C 1, capacitor C 2 and linear DC voltage-stabilizing device; One end of capacitor C 1 links to each other with the anode of outside input power supply, and the other end of capacitor C 1 links to each other with the negative terminal of outside input power supply; One end of capacitor C 2 links to each other with the output of linear DC voltage-stabilizing device, and the other end of capacitor C 2 links to each other with the negative terminal of outside input power supply; The input of linear DC voltage-stabilizing device links to each other with the anode of outside input power supply, and the output of linear DC voltage-stabilizing device is as the output of voltage conversion circuit, and the earth terminal of linear DC voltage-stabilizing device links to each other with the negative terminal of outside input power supply.
Described optical coupling isolation circuit comprises resistance R 1, resistance R 2, resistance R 3, capacitor C 3 and optocoupler; The TTL/CMOS signal input anode of outside input links to each other with the anode of light-emitting diode in the optocoupler by resistance R 1; The TTL/CMOS signal input negative terminal of outside input links to each other with the negative electrode of described light-emitting diode; The earth terminal of optocoupler links to each other with the negative terminal of outside input power supply; The output of optocoupler is connected to an end of resistance R 3, and the other end of resistance R 3 is as the output of optical coupling isolation circuit; The power end of optocoupler is connected to the output of voltage conversion circuit, and the two ends of resistance R 2 link to each other with output with the power end of optocoupler respectively, and the two ends of resistance C3 link to each other with earth terminal with the power end of optocoupler respectively.
Described cmos driver spare circuit uses the circuit connecting mode that does not possess high and low level controlling and driving device to be: comprise resistance R 4, resistance R 5 and cmos driver spare; The output of optical coupling isolation circuit links to each other with the signal input part of COMS driving element by resistance R 4; The signal output part of COMS driving element is connected to an end of resistance R 5, and the other end of resistance R 5 is as the output of CMOS drive circuit; The power positive end of COMS driving element connects the anode of outside input power supply; The earth terminal of COMS driving element links to each other with the negative terminal of outside input power supply.
Described cmos driver spare circuit uses the circuit connecting mode that possesses high and low level controlling and driving device to be: comprise resistance R 6, resistance R 7 and cmos driver spare; The output of optical coupling isolation circuit links to each other with the signal input part of COMS driving element by resistance R 6; The signal output part of COMS driving element is connected to an end of resistance R 7, and the other end of resistance R 7 is as the output of CMOS drive circuit; The power positive end of COMS driving element, work Enable Pin, output high level voltage end VH link to each other with the anode of outside input power supply simultaneously; The earth terminal of COMS driving element, output low level voltage end VL, power supply negative terminal link to each other with the negative terminal of outside input power supply simultaneously.
Described capacitor C 1, perhaps capacitor C 2, and perhaps capacitor C 3 is replaceable is the filter network of being made up of electric capacity, resistance, inductance.
The utility model advantage compared with prior art is: the utility model is by increasing power-switching circuit and optical coupling isolation circuit on the basis of traditional cmos driving element circuit, set up new Voltage Reference system, make the cmos driver spare that to export the positive level drive signal just exporting on the one hand, the drive signal of negative level, can also make on the other hand and just have, conversion meets the demands the drive signal level of output to the cmos driver spare of negative level output through the Voltage Reference system, enlarged the scope of application of cmos driver spare, made the design of CCD camera drive signal more agile and all-purpose.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model;
Fig. 2 is the schematic diagram of voltage conversion circuit in the utility model;
Fig. 3 is the schematic diagram of optical coupling isolation circuit in the utility model;
Fig. 4 is the schematic diagram of first kind of cmos driver spare circuit in the utility model;
Fig. 5 is the schematic diagram of second kind of cmos driver spare circuit in the utility model.
Embodiment
As shown in Figure 1, be theory of constitution block diagram of the present utility model, the course of work is: at first outside input power supply is set up new Voltage Reference system by voltage conversion circuit, and the power supply that voltage transitions obtains is powered to optical coupling isolation circuit.TTL/CMOS time sequential pulse signal process optocoupler carries out Signal Spacing, obtains to satisfy the signal that the input of cmos driver spare requires, and process cmos driver spare circuit acquisition voltage and power satisfy the drive pulse signal of CCD device job requirement then.
A kind of physical circuit connected mode of voltage conversion circuit is as shown in Figure 2: voltage conversion circuit is made up of capacitor C 1, capacitor C 2 and linear DC voltage-stabilizing device 401.One end of capacitor C 1 links to each other with power supply V+ input 101, and the other end links to each other with power supply V-input 102.One end of capacitor C 2 links to each other with the output VOUT of linear DC voltage-stabilizing device 401, the output VOUT of linear DC voltage-stabilizing device 401 is the output 103 of voltage conversion circuit, and the other end of capacitor C 2 links to each other with the earth terminal GND of power supply V-input 102 and linear DC voltage-stabilizing device 401.The input VIN of linear DC voltage-stabilizing device 401 links to each other with power supply V+ input 101.The main effect of capacitor C 1 and capacitor C 2 is that power supply is carried out filtering and noise reduction.The μ A78M05 that linear DC voltage-stabilizing device 401 selects for use Texas Instruments company to produce.
A kind of physical circuit connected mode of optical coupling isolation circuit is as shown in Figure 3: optical coupling isolation circuit is made up of resistance R 1, R2, R3, capacitor C 3, optocoupler 402.The TTL/CMOS signal IN of input links to each other with the light-emitting diodes tube anode of optocoupler 402 by resistance R 1 through input 104, and input signal loop line 105 links to each other with the light-emitting diodes tube cathode of optocoupler 402.The earth terminal GND of optocoupler 402 links to each other with power supply V-input 102; The power end VCC of optocoupler 402 links to each other with the output 103 of voltage conversion circuit, and links to each other with power supply V-input 102 by capacitor C 3.The output OUT of optocoupler 402 is connected to an end of resistance R 3, and the other end of resistance R 3 is as the output 106 of optical coupling isolation circuit, and the two ends of resistance R 2 link to each other with output OUT with the power end VCC of optocoupler 402 respectively.The main effect of resistance R 1 is to carry out current limliting, and the Current Control of light-emitting diode that makes the optocoupler 402 of flowing through is in claimed range.Resistance R 2 is as pull-up resistor, main effect be make the output OUT of optocoupler 402 when being output as high level by moving a fixed level on the resistance R 2 to.The main effect of resistance R 3 is to carry out impedance matching, is beneficial to the signal integrity of circuit PCB design.The effect of capacitor C 3 is to carry out the power filter denoising.The HCPL-0661 that optocoupler 402 selects for use Hewlett Packard company to produce.
The CMOS drive circuit can be for not possessing high and low level controlling and driving device, also can be for possessing high and low level controlling and driving device.
The CMOS drive circuit use do not possess high and low level controlling and driving device a kind of physical circuit connected mode as shown in Figure 4: form by resistance R 4, R5, cmos driver spare 403.The signal of isolating through optocoupler 402 links to each other with the signal input part IN of COMS driving element 403 by resistance R 4 through the output 106 of optical coupling isolation circuit, the signal output part OUT of COMS driving element 403 is connected to an end of resistance R 5, the other end of resistance R 5 is as the output 108 of CMOS drive circuit, i.e. SIG_out1 among the figure.The power positive end of COMS driving element 403 links to each other with power supply V+ input 101, and the earth terminal GND of COMS driving element 403 links to each other with power supply V-input 102.The main effect of resistance R 4 is to carry out current-limiting protection.The main effect of resistance R 5 is to carry out impedance matching.Cmos driver spare 403 is selected the EL7212 of Elantec company for use.
The CMOS drive circuit use possess high and low level controlling and driving device a kind of physical circuit connected mode as shown in Figure 5: form by resistance R 6, R7, cmos driver spare 404.The signal of isolating through optocoupler 402 links to each other with the signal input part IN of COMS driving element 404 by resistance R 6 through the output 106 of optical coupling isolation circuit, the signal output part OUT of COMS driving element 404 is connected to an end of resistance R 7, the other end of resistance R 7 is as the output 109 of CMOS drive circuit, i.e. SIG_out2 among the figure.The positive supply VS+ of COMS driving element 404, work enable OE, output high level voltage VH and link to each other with power supply V+ input 101 simultaneously, and the ground GND of COMS driving element 404, output low level voltage VL, negative supply VS-link to each other with power supply V-input 102.The main effect of resistance R 6 is to carry out current-limiting protection.The main effect of resistance R 7 is to carry out impedance matching.Cmos driver spare 404 is selected the EL7457 of EIantec company for use.
The content that is not described in detail in the utility model specification belongs to those skilled in the art's known technology.
Claims (6)
1. the remote sensing CCD camera isolated drive circuit is characterized in that comprising voltage conversion circuit, optical coupling isolation circuit, cmos driver spare circuit, wherein:
Voltage conversion circuit: utilize the linear DC voltage-stabilizing device that the DC power supply of outside input is carried out voltage transitions, the required power supply of optocoupler work in the optical coupling isolation circuit is provided;
Optical coupling isolation circuit: receive the outside time sequential pulse signal of sending into, utilize optocoupler to carry out Signal Spacing after, offer cmos driver spare circuit;
Cmos driver spare circuit: receive the pulse signal after Signal Spacing that optical coupling isolation circuit is sent into, carry out voltage transitions and power drive, obtain drive signal and offer the CCD device by cmos driver spare.
2. remote sensing CCD camera isolated drive circuit according to claim 1 is characterized in that: described voltage conversion circuit comprises capacitor C 1, capacitor C 2 and linear DC voltage-stabilizing device (401); One end of capacitor C 1 links to each other with the anode (101) of outside input power supply, and the other end of capacitor C 1 links to each other with the negative terminal (102) of outside input power supply; One end of capacitor C 2 links to each other with the output of linear DC voltage-stabilizing device (401), and the other end of capacitor C 2 links to each other with the negative terminal (102) of outside input power supply; The input of linear DC voltage-stabilizing device (401) links to each other with the anode (101) of outside input power supply, the output of linear DC voltage-stabilizing device (401) is as the output (103) of voltage conversion circuit, and the earth terminal of linear DC voltage-stabilizing device (401) links to each other with the negative terminal (102) of outside input power supply.
3. remote sensing CCD camera isolated drive circuit according to claim 2 is characterized in that: described optical coupling isolation circuit comprises resistance R 1, resistance R 2, resistance R 3, capacitor C 3 and optocoupler (402); The TTL/CMOS signal input anode (104) of outside input links to each other with the anode of light-emitting diode in the optocoupler (402) by resistance R 1; The TTL/CMOS signal input negative terminal (105) of outside input links to each other with the negative electrode of described light-emitting diode; The earth terminal of optocoupler (402) links to each other with the negative terminal (102) of outside input power supply; The output of optocoupler (402) is connected to an end of resistance R 3, and the other end of resistance R 3 is as the output (106) of optical coupling isolation circuit; The power end of optocoupler (402) is connected to the output (103) of voltage conversion circuit, the two ends of resistance R 2 link to each other with output with the power end of optocoupler (402) respectively, and the two ends of resistance C3 link to each other with earth terminal with the power end of optocoupler (402) respectively.
4. remote sensing CCD camera isolated drive circuit according to claim 3 is characterized in that: described cmos driver spare circuit uses the circuit connecting mode that does not possess high and low level controlling and driving device to be: comprise resistance R 4, resistance R 5 and cmos driver spare (403); The output of optical coupling isolation circuit (106) links to each other with the signal input part of COMS driving element (403) by resistance R 4; The signal output part of COMS driving element (403) is connected to an end of resistance R 5, and the other end of resistance R 5 is as the output (108) of CMOS drive circuit; The power positive end of COMS driving element (403) connects the anode (101) of outside input power supply; The earth terminal of COMS driving element (403) links to each other with the negative terminal (102) of outside input power supply.
5. remote sensing CCD camera isolated drive circuit according to claim 3 is characterized in that: described cmos driver spare circuit uses the circuit connecting mode that possesses high and low level controlling and driving device to be: comprise resistance R 6, resistance R 7 and cmos driver spare (404); The output of optical coupling isolation circuit (106) links to each other with the signal input part of COMS driving element (404) by resistance R 6; The signal output part of COMS driving element (404) is connected to an end of resistance R 7, and the other end of resistance R 7 is as the output (109) of CMOS drive circuit; The power positive end of COMS driving element (404), work Enable Pin, output high level voltage end VH link to each other with the anode (101) of outside input power supply simultaneously; The earth terminal of COMS driving element (404), output low level voltage end VL, power supply negative terminal link to each other with the negative terminal (102) of outside input power supply simultaneously.
6. according to claim 4 or 5 described remote sensing CCD camera isolated drive circuits, it is characterized in that: described capacitor C 1, perhaps capacitor C 2, and perhaps capacitor C 3 is replaceable is the filter network of being made up of electric capacity, resistance, inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202467728U CN201585033U (en) | 2009-11-02 | 2009-11-02 | Isolating driving circuit for remote sensing CCD camera |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202467728U CN201585033U (en) | 2009-11-02 | 2009-11-02 | Isolating driving circuit for remote sensing CCD camera |
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| CN201585033U true CN201585033U (en) | 2010-09-15 |
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| CN2009202467728U Expired - Fee Related CN201585033U (en) | 2009-11-02 | 2009-11-02 | Isolating driving circuit for remote sensing CCD camera |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105099422A (en) * | 2015-08-19 | 2015-11-25 | 深圳市华星光电技术有限公司 | Optical coupling isolation switch circuit |
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2009
- 2009-11-02 CN CN2009202467728U patent/CN201585033U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105099422A (en) * | 2015-08-19 | 2015-11-25 | 深圳市华星光电技术有限公司 | Optical coupling isolation switch circuit |
| WO2017028348A1 (en) * | 2015-08-19 | 2017-02-23 | 深圳市华星光电技术有限公司 | Optical coupling isolation switch circuit |
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Granted publication date: 20100915 Termination date: 20161102 |
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| CF01 | Termination of patent right due to non-payment of annual fee |