CN107835339A - A kind of space camera cmos image sensor locking means of defence and system - Google Patents
A kind of space camera cmos image sensor locking means of defence and system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for DC applications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/40—Circuit details for pick-up tubes
- H04N23/41—Beam current control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/70—SSIS architectures; Circuits associated therewith
- H04N25/76—Addressed sensors, e.g. MOS or CMOS sensors
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Abstract
The invention discloses a kind of space camera cmos image sensor locking guard system and method; the scope of application existing for solution existing system and method is small, current limit threshold is fixed value, it is difficult to and the lock current of protected device matches, protected device can not be made to depart from lock-out state, easily cause erroneous judgement, influence the shortcomings of cmos image sensor life-span.Space camera cmos image sensor locks guard system by being formed including DC DC modules, magnetic latching relay, precision resistance, current-limiting type low-dropout regulator, accurate operational amplifier, A/D modular converters, camera controller CPU, order-driven device and nonvolatile storage.Space camera cmos image sensor locks means of defence and changed by starting A/D with the frequency of more than 10 times of cmos image sensor operating current highest vibration frequency, and 2 cmos image sensor operating currents of continuous sampling are more than most long period of waves, and code value scope corresponding to cmos image sensor normal work can be changed etc. after Spacecraft Launch to avoid judging by accident.
Description
Technical field
The present invention relates generally to the space camera using cmos image sensor, and in particular, it is related to space camera
Cmos image sensor locks guard system and method.
Background technology
Space camera is using spacecraft as observation platform, to other celestial bodies imaging such as the earth or the moon, Mars.Cosmic space
Gamma-rays, X ray, electronics, proton, neutron and various heavy ions be present in (cosmic space especially outside earth atmosphere),
Its radiation effect can be damaged the photoelectric device in space camera, cause space camera operation irregularity or failure.Space radiation pair
The radiation effect of space camera mainly includes total radiation dose, single particle effect and and displacement effect.Wherein single particle effect is
Refer to transient-upset or permanent damage of the single energetic particle hits to electronic device, be divided into single event function interrupt effect
(also referred to as Single Event Upset effect, Single Event Upset, abbreviation SEU) and locking single particle effect (also referred to as simple grain
Sub- bolt-lock effect, Single Event Latch, abbreviation SEL).If locking single particle effect without good safeguard procedures,
It may cause high current caused by low resistance state that metal wire in device fuses, cause permanent damage, or even device be burnt, nothing
Method is recovered.
Space camera is typically using charge coupling device (Charge Couple Device, CCD) or CMOS as image
Sensor carries out opto-electronic conversion, and with the development of cmos image sensor technology, it gradually substitutes CCD, should in space camera
With also becoming more and more extensive.When locking single particle occurs for cmos image sensor, supply current can sharply increase, if do not had
There are safeguard procedures, cmos image sensor can be caused impaired or even directly scrapped.Confession is typically employed in space camera at present
Current-limiting resistance or current-limiting type low-dropout regulator (also referred to as low pressure difference linear voltage regulator, Low Dropout are added in electrical circuit
Regulator, abbreviation LDO) method carry out locking protection (Guo Yong fly the radioresistance strategy study China of remote sensing CCD cameras
Optics and Application Optics, 2010,3 (6):534-545).However, the method that current-limiting resistance is added in current supply circuit is only used for
Dynamic duty electric current 10mA and latch-up current/operating current>20 CMOS integrated devices.
The characteristics of current-limiting type low-dropout regulator is when its output current exceedes threshold value, and it is that threshold value is big to maintain output current
It is small, avoid electric current from crossing senior general's imaging sensor and directly burn, the threshold value is relevant with the model of current-limiting type low-dropout regulator, such as
MAX883 is 430mA (see MAX883 databooks).However, this method still there is following drawback：
(it is generally firstly, since the threshold value of current-limiting type low-dropout regulator is relevant with current-limiting type low-dropout regulator model
Fixed value), it is difficult to and the lock current of protected device matches.When the lock current of protected device is adjusted than current-limiting type low voltage difference
The threshold value of whole device is small, and current-limiting type low-dropout regulator can only limit the current to current-limiting type low pressure when protected device locks
At the threshold value of poor adjuster, it is impossible to protected device is departed from lock-out state.When current-limiting type low-dropout regulator and cmos image
It when sensor is in threshold current state, can largely generate heat, if be in this state for a long time, device can be caused to overheat,
The life-span of cmos image sensor is influenceed, and still has the possibility for burning cmos image sensor and current-limiting type low-dropout regulator.
Secondly, cmos image sensor in the course of the work, its operating current using row cycle/frame period as the cycle significantly
Fluctuation, easily causes erroneous judgement by single threshold decision, causes protection circuit to malfunction, influence the normal work of space camera
Make.Meanwhile cmos image sensor, due to the influence of space radiation accumulated dose, its operating current has just been sent out relatively after the several years that works
It can be had a greater change when penetrating, if protective circuit for locking is judged still according to threshold value before, also easily cause erroneous judgement,
Cause protection circuit to malfunction, influence the normal work of space camera.
The content of the invention
The present invention is directed to the space camera using cmos image sensor in the presence of locking single particle effect, does not prevent
Shield measure may cause high current caused by low resistance state that metal wire in device can fuse, and cause permanent damage, or even can incite somebody to action
Device burns, can not recovered, and existing method is present that the scope of application is small, current limit threshold is fixed value, it is difficult to and protected device
Lock current matching, can not make protected device depart from lock-out state, easily cause erroneous judgement, influence the cmos image sensor longevity
The shortcomings of life, there is provided a kind of space camera cmos image sensor locking guard system and method.
The technical solution adopted for solving the technical problem of the present invention is as follows：
A kind of space camera cmos image sensor locks guard system, and the system includes DC-DC module (10), magnetic is kept
Relay (20), precision resistance (30), current-limiting type low-dropout regulator (40), accurate operational amplifier (50), A/D modular converters
(60), camera controller CPU (70), order-driven device (80) and nonvolatile storage (90)；
The DC-DC module (10) is used for the second electricity that the first voltage that whole star is powered is transformed to space camera and used
Pressure, the second voltage after conversion deliver to magnetic latching relay (20), and DC-DC module (10) is additionally operable to supply the power supply of whole star and camera
Electricity is isolated；
The magnetic latching relay (20) is used to open or close relay switch under the control of instruction, makes cmos image
Sensor is powered on and off；The input of magnetic latching relay (20) switch is the output of DC-DC module (10), is exported to accurate electricity
Hinder (30)；The input of magnetic latching relay (20) coil is the output of order-driven device (80), when the output of order-driven device is honest
When flowing pulse, relay switch is opened, cmos image sensor power-up, when order-driven device exports anti-DC pulse, relay
Device switch is closed, cmos image sensor power-off；
The electric current when precision resistance (30) is used to work cmos image sensor is converted into voltage, so as to follow-up
Amplification and detection；The input of precision resistance (30) is the output of magnetic latching relay (20), is believed for the second voltage that camera uses
Number exported after precision resistance (30) and to give current-limiting type low-dropout regulator (40)；The input and output end of precision resistance (30) point
The positive input terminal and negative input end of accurate operational amplifier (50) are not delivered to, so that follow-up signal amplifies；
The current-limiting type low-dropout regulator (40) is used for will be received from precision resistance (30) used for camera the
Two voltage signals are transformed to the voltage that cmos image sensor directly uses, and cmos image sensor is powered；Current-limiting type low pressure
Poor adjuster (40) is additionally operable to when locking single particle occurs for cmos image sensor, if operating current exceedes current-limiting type low pressure
During the cut-off current of poor adjuster (40), current-limiting type low-dropout regulator (40) is by the current limit of output in cut-off current；
It is described precisely operational amplifier (50) be used for the voltage at precision resistance (30) both ends is amplified, so as to and A/D
The dynamic range matching of modular converter (60)；The input of accurate operational amplifier (50) is the both ends of precision resistance (30), through essence
Voltage after quasi- operational amplifier (50) amplification delivers to A/D modular converters (60)；
The A/D modular converters (60) are used to the voltage signal of accurate operational amplifier (50) output carrying out modulus turn
Change, be converted to digital quantity, so that camera controller CPU (70) is handled；The input of A/D modular converters (60) is accurate computing
The output of amplifier (50), the digital quantity obtained after A/D modular converters (60) conversion deliver to camera controller CPU (70)；
The camera controller CPU (70) is used for the digital quantity exported according to A/D modular converters (60), from non-volatile memory
Code value scope corresponding to the cmos image sensor normal work that device (90) is read, and the control received according to Star Service main frame
Instruction, the powered up and down of magnetic latching relay is controlled by order-driven device (80), realizes the lock to cmos image sensor
Fixed protection；When camera controller CPU (70) is received corresponding to the new cmos image sensor normal work of Star Service main frame transmission
During code value scope, code value scope corresponding to cmos image sensor normal work is write into nonvolatile storage (90)；Camera control
The input of device CPU (70) processed includes digital quantity, the CMOS read from nonvolatile storage (90) of A/D modular converters (60) output
Code value scope corresponding to imaging sensor normal work and the control instruction received from Star Service main frame；Camera controller CPU
(70) output is positive direct-current pulse or anti-DC pulse, exports and gives order-driven device (80)；
It is positive direct-current pulse or anti-direct current arteries and veins that the order-driven device (80), which is used for camera controller CPU (70) output,
After punching is amplified, driving magnetic latching relay (20) work, open or close magnetic latching relay switch；Order-driven device
(80) input is camera controller CPU (70) output, and it is exported to magnetic latching relay (20)；
The nonvolatile storage (90) is used to store code value scope corresponding to cmos image sensor normal work,
When the locking safeguard function of cmos image sensor is opened, nonvolatile storage (90) is by cmos image sensor normal work pair
The code value scope answered is exported to camera controller CPU (70)；When camera controller CPU (70) receives the new of Star Service main frame transmission
Corresponding to cmos image sensor normal work during code value scope, nonvolatile storage (90) is defeated from camera controller CPU (70)
Enter code value scope corresponding to new cmos image sensor normal work.
Inventor additionally provides a kind of method of space camera cmos image sensor locking protection, it is characterized in that, the party
Method is realized by following steps：
Step 1: after camera controller CPU (70) receives the imaging sign on of Star Service main frame transmission, pass through order-driven
Device (80) sends positive direct-current pulse, closes magnetic latching relay (20), performs step 2 afterwards；
Step 2: whole star is powered after DC-DC module (10) conversion by magnetic latching relay (20), precision resistance (30)
Powered with current-limiting type low-dropout regulator (40) to cmos image sensor, start to be imaged, perform step 3 afterwards；
Step 3: precisely operational amplifier (50) will deliver to A/D conversions after the voltage difference amplification at precision resistance (30) both ends
Module (60), performs step 4 afterwards；
Step 4: camera controller CPU (70) is with more than 10 times of cmos image sensor operating current highest vibration frequency
Frequency start A/D conversions, and 2 cmos image sensor operating currents of continuous sampling more than most long period of waves are held afterwards
Row step 5；
Step 5: the cmos image sensor locking protection that camera controller CPU (70) is sent according to Star Service main frame is set
Instruction judges to lock whether safeguard function is opened, if opened, performs step 6, otherwise perform step 10；
Step 6: camera controller CPU (70) judges whether the obtained code value of sampling is converted to the minimum value after electric current big
1.5 times in cmos image sensor running current minimum value or 0.95 times more than lock threshold current minimum, such as
Fruit is to perform step 7, otherwise performs step 10；
Step 7: camera controller CPU (70) sends anti-DC pulse by order-driven device (80), magnetic is set to keep relay
Device (20) disconnects, and powers off cmos image sensor, performs step 8 afterwards；
Step 8: camera controller CPU (70) notifies Star Service host C MOS images to pass by remote measurement amount via bus on star
Sensor is locked, and performs step 9 afterwards；
Step 9: Star Service main frame cuts off power supply of the satellite to whole camera subsystem, make camera and other subsystems on star
Isolation, terminates afterwards；
Step 10: camera controller CPU (70) judges whether to have received the imaging out code of Star Service main frame transmission, if
It is to perform step 11, otherwise return to step three；
Step 11: camera controller CPU (70) sends anti-DC pulse by order-driven device (80), make magnetic keep after
Electrical equipment (20) disconnects, and powers off cmos image sensor, imaging terminates, afterwards return to step one.
Further, methods described includes step：
In laboratory to code corresponding to cmos image sensor normal work before the Spacecraft Launch that space camera carries
Value scope is demarcated and changed.
Further, methods described includes step：
After the Spacecraft Launch that space camera carries, spacecraft is sent to through TT＆C antenna by ground control station, by star
Business main frame is modified after being transmitted to space camera to code value scope corresponding to cmos image sensor normal work.
Technical scheme provided by the present invention, which can be seen that the compared to the prior art present invention, has advantages below：
1. locking the threshold value of protection can adjust according to by the actual conditions of protection cmos image sensor, so as to solve
The problem of existing method Protection Threshold is difficult to match with the lock current of protected device, protected device can not be made by avoiding the occurrence of
Depart from the situation of lock-out state, ensure that the life-span of cmos image sensor is unaffected.
2. for the dynamic change of operating current in the cmos image sensor course of work, worked with cmos image sensor
The frequency that more than 10 times of electric current highest vibration frequency carries out A/D conversions and sampling, and 2 cmos image sensor works of continuous sampling
It is more than most long period of waves to make electric current, avoids single threshold decision from causing to judge by accident, causes protection circuit to malfunction, influence space
The normal work of camera.
When 3.CMOS imaging sensors lock, CMOS figures are fully disconnected rapidly by way of control relay switch
As sensor and its path of peripheral circuit and power supply, physical isolation is realized, avoids failure from being spread to by power-supply system
Other interlock circuits of camera, and power supply of the satellite to whole camera subsystem is cut off eventually through Star Service main frame, make camera and star
Upper other subsystems isolation, ensure the safety of whole other subsystems of star.
4. locking safeguard function can be by noting instruction unpack or closing on ground, cmos image sensor normal work corresponds to
Code value scope can space camera carry Spacecraft Launch after, be sent to space flight through TT＆C antenna by ground control station
Device, modified after being transmitted to space camera by Star Service main frame.Cmos image sensor is avoided in the work of space radiation accumulated dose
Under, it can be had a greater change when its operating current is just launched relatively after the several years that works, cause to judge by accident, cause protection circuit malfunction
Make, ensure the long-life reliably working of space camera.Locking safeguard function can also be closed when protection circuit breaks down, it is first
First ensure that camera being capable of normal work when locking single particle effect does not occur.
Brief description of the drawings
Fig. 1 is the structure that space camera cmos image sensor locks guard system in one embodiment of the invention
Figure；
Fig. 2 is the detailed stream that space camera cmos image sensor locks means of defence in one embodiment of the invention
Cheng Tu；
Reference：
10th, DC-DC module；
20th, magnetic latching relay；
30th, precision resistance；
40th, current-limiting type low-dropout regulator；
50th, accurate operational amplifier；
60th, A/D modular converters；
70th, camera controller CPU；
80th, order-driven device；
90th, nonvolatile storage.
Embodiment
To describe the technology contents of technical scheme, construction feature, the objects and the effects in detail, below in conjunction with specific reality
Apply example and coordinate accompanying drawing to be explained in detail.
With reference to Fig. 1 to Fig. 2, a preferred embodiment to the present invention is described in detail.As shown in figure 1, it is sky
Between camera cmos image sensor locking guard system, the system includes DC-DC module 10, magnetic latching relay 20, accurate electricity
Resistance 30, current-limiting type low-dropout regulator 40, accurate operational amplifier 50, A/D modular converters 60, camera controller CPU70, instruction
Driver 80 and nonvolatile storage 90.It is characterized in that the DC-DC module (10) is used to power on the whole star of high voltage
(i.e. first voltage, usual 28V-42V) is transformed to the low voltage (i.e. second voltage, usual 0-15V) that camera uses, after conversion
Low voltage deliver to magnetic latching relay (20), another effect of DC-DC module be the power supply of whole star and camera are powered into
The a certain degree of isolation of row, ensures security；
The magnetic latching relay (20) is used to open or close relay switch under the control of instruction, makes cmos image
Sensor is powered on and off.The input of magnetic latching relay (20) switch is the output of DC-DC module (10), is exported to accurate electricity
Hinder (30).The input of magnetic latching relay (20) coil is the output of order-driven device (80), when the output of order-driven device is honest
When flowing pulse, relay switch is opened, cmos image sensor power-up, when order-driven device exports anti-DC pulse, relay
Device switch is closed, cmos image sensor power-off.
The electric current when precision resistance (30) is used to work cmos image sensor is converted into voltage, so as to follow-up
Amplification and detection.The input of precision resistance (30) is the output of magnetic latching relay (20), is believed for the low voltage that camera uses
Number exported after precision resistance (30) and to give current-limiting type low-dropout regulator (40).The input and output end of precision resistance (30) point
The positive input terminal and negative input end of accurate operational amplifier (50) are not delivered to, so that follow-up signal amplifies.Precision resistance, refer to
The resistance error of resistance, the heat endurance (temperature coefficient) of resistance, distributed constant (distribution capacity and the distribution electricity of resistor
Sense) etc. item index reach the resistor of certain standard.In general, to the resistance of 1 Ω (ohm) above resistance, hindered with mark
The resistance that value compares resistance error within ± 0.5% can be described as precision resistance.
The current-limiting type low-dropout regulator (40) be used for will be received from precision resistance (30) for camera use compared with
Low voltage signal (i.e. second voltage) is transformed to the voltage (usual 0-5V) that cmos image sensor directly uses, to cmos image
Sensor is powered.Another effect of current-limiting type low-dropout regulator (40) is, when single-particle lock occurs for cmos image sensor
Regularly, if operating current exceedes the cut-off current of current-limiting type low-dropout regulator (40), current-limiting type low-dropout regulator (40)
By the current limit of output in cut-off current, avoid a certain moment from being supplied to cmos image sensor excessive, cause cmos image to pass
Sensor is damaged.
The precisely operational amplifier (50) is used to be amplified the voltage at precision resistance (30) both ends, so as to and A/D
The dynamic range matching of modular converter (60), reduce A/D conversion quantization errors.The input of accurate operational amplifier (50) is precision
The both ends of resistance (30), the voltage after accurate operational amplifier (50) amplification deliver to A/D modular converters (60).
The A/D modular converters (60) are used to the voltage signal of accurate operational amplifier (50) output carrying out A/D (moulds
Plan/numeral) conversion, digital quantity is converted to, so that camera controller CPU (70) is handled.The input of A/D modular converters (60)
For the output of accurate operational amplifier (50), the digital quantity obtained after A/D modular converters (60) conversion delivers to camera controller
CPU(70)。
The camera controller CPU (70) is used for the digital quantity exported according to A/D modular converters (60), from non-volatile memory
Code value scope corresponding to the cmos image sensor normal work that device (90) is read, and the control received from Star Service main frame refer to
Order, the powered up and down of magnetic latching relay is controlled by order-driven device (80), realizes the locking to cmos image sensor
Protection.When camera controller CPU (70) receives code corresponding to the new cmos image sensor normal work of Star Service main frame transmission
When being worth scope, code value scope corresponding to cmos image sensor normal work is write into nonvolatile storage (90).Camera control
Device CPU (70) input includes digital quantity, the CMOS figures read from nonvolatile storage (90) of A/D modular converters (60) output
Code value scope and the control instruction received from Star Service main frame as corresponding to normal operation of sensor.Camera controller CPU (70)
Output be positive direct-current pulse or anti-DC pulse, export and give order-driven device (80).
It is positive direct-current pulse or anti-direct current arteries and veins that the order-driven device (80), which is used for camera controller CPU (70) output,
After punching is amplified, driving magnetic latching relay (20) work, open or close magnetic latching relay switch.Order-driven device
(80) input is camera controller CPU (70) output, and it is exported to magnetic latching relay (20).
The nonvolatile storage (90) is used to store code value scope corresponding to cmos image sensor normal work,
When the locking safeguard function of cmos image sensor is opened, nonvolatile storage (90) is by cmos image sensor normal work pair
The code value scope output camera controller CPU (70) answered.When camera controller CPU (70) receives the new of Star Service main frame transmission
Corresponding to cmos image sensor normal work during code value scope, nonvolatile storage (90) is defeated from camera controller CPU (70)
Enter code value scope corresponding to new cmos image sensor normal work.
In the present embodiment, DC-DC module (10) uses the Mhv2805S/883 of Interpoint companies, and its input is 30V
Whole star power supply, export as 5V, power output 15W.Magnetic latching relay (20) is using Guilin Space Electronics Co., Ltd
3JB20-3, precision resistance (30) use 0.03 ohm of Precise Alloy paper tinsel resistance (rated power 3W) of ISA companies production.Limit
Flow pattern low-dropout regulator (40) uses the MAX883 of MAXIM companies, and its current limit threshold is 430mA.Accurate operational amplifier
(50) RH6105 of rib Li Erte companies is used, the gain degree of accuracy is better than 1%, inputs common mode inhibition and power supply is suppressed over
100dB.A/D modular converters (60) use AD574, quantization digit 12.CPU 70 uses the TSC695F of ACTEL companies,
TSC695F is 32 bit processors that radioresistance accumulated dose reaches 300Krad (Si), the characteristics of for space application, using error correction and detection
Mechanism improves reliability.Order-driven device (80) uses the KG25A of Xi'an microelectric technique research institute, nonvolatile storage
(90) EEPROM of 3Dplus companies is used, concrete model 3DEE5M40CS5175, memory capacity is 128K × 40.Need
Illustrate, the model of above-mentioned each element (such as DC-DC module, current-limiting type low-dropout regulator) is only one kind of the present invention
Embodiment, in actual application, it can be operated according to the related elements being actually needed from other models, it is same suitable
For system disclosed by the invention or method.
Illustrate the present embodiment with reference to Fig. 2, space camera cmos image sensor locks the method for guard system, its feature
It is that this method is realized by following steps：
Step 1: camera controller CPU (70) (TSC695F) passes through after receiving the imaging sign on of Star Service main frame transmission
Order-driven device (80) (KG25A) sends positive direct-current pulse, closes magnetic latching relay (20) (3JB20-3), performs afterwards
Step 2；
Step 2: whole star is powered after DC-DC module (10) (Mhv2805S/883) conversion by magnetic latching relay
(20) (3JB20-3), precision resistance (30) (ISA0.03 ohm Precise Alloy paper tinsels resistance) and current-limiting type low-dropout regulator (40)
(MAX883) powered to cmos image sensor, start to be imaged, perform step 3 afterwards；
Step 3: precisely operational amplifier (50) (RH6105) is by precision resistance (30) (ISA0.03 ohm Precise Alloy paper tinsels
Resistance) both ends voltage difference amplification after deliver to A/D modular converters (60) (AD574), perform step 4 afterwards；
Step 4: camera controller CPU (70) (TSC695F) is with cmos image sensor operating current highest vibration frequency
More than 10 times of frequency starts A/D conversions, and 2 cmos image sensor operating currents of continuous sampling most long period of waves with
On, step 5 is performed afterwards；
Step 5: the cmos image sensor that camera controller CPU (70) (TSC695F) is sent according to Star Service main frame locks
Protection sets instruction to judge to lock whether safeguard function is opened, if opened, performs step 6, otherwise performs step 10；
Step 6: camera controller CPU (70) (TSC695F) judges that the code value that sampling obtains is converted to minimum value after electric current
Whether 1.5 times or 0.95 more than lock threshold current minimum of cmos image sensor running current minimum value are more than
Times, step 7 is if it is performed, otherwise performs step 10；
Step 7: camera controller CPU (70) (TSC695F) sends anti-direct current by order-driven device (80) (KG25A)
Pulse, magnetic latching relay (20) (3JB20-3) is disconnected, cmos image sensor is powered off, performs step 8 afterwards；
Step 8: camera controller CPU (70) (TSC695F) notifies Star Service main frame by remote measurement amount via bus on star
Cmos image sensor is locked, and performs step 9 afterwards；
Step 9: Star Service main frame cuts off power supply of the satellite to whole camera subsystem, make camera and other subsystems on star
Isolation, terminates afterwards；
Step 10: the imaging that camera controller CPU (70) (TSC695F) judges whether to have received the transmission of Star Service main frame is closed
Instruction, if it is, performing step 11, otherwise return to step three；
Step 11: camera controller CPU (70) (TSC695F) is anti-straight by order-driven device (80) (KG25A) transmission
Pulse is flowed, magnetic latching relay (20) (3JB20-3) is disconnected, powers off cmos image sensor, imaging terminates, and returns afterwards
Step 1.
In the present embodiment, cmos image sensor used is the GL1216 of Chang Guangchen cores company, the power supply electricity needed for it
Source is 3.6V, 3.2V and 1.8V, is obtained respectively using 3 MAX883 by voltage transformation, and 3 MAX883 input is all precision
The output of resistance (30) (ISA0.03 ohm Precise Alloy paper tinsels resistance).By GL1216 in laboratory measurement photographic process and its
The operating current of peripheral power supply circuit is fluctuated using the row cycle as the cycle, and the minimum value of fluctuation is 370mA, and maximum is
500mA, the multiplication factor of accurate operational amplifier (50) (RH6105) are arranged to 200 times, and the voltage after corresponding amplification is electric is
The reference voltage that 2.22V-3V, AD574 are used is quantified for 5V using 12bit, and the code value after A/D is changed is 1819-
2458.1.5 times of minimum working current is 555mA, the code value 2728 after corresponding A/D conversions.In further embodiments, CMOS schemes
As sensor, precision resistance can also select other models according to being actually needed.
The row cycle of the space camera is 2-5ms, therefore in step 4, with cmos image sensor operating current highest
The frequency that more than 10 times of vibration frequency is 5000 hertz and starts A/D conversions, and 2 cmos image sensor work electricity of continuous sampling
Flow most long period of waves, i.e. more than 10ms.Obtained code value is sampled by being passed under remote measurement, when cmos image sensor is in space spoke
In the presence of firing association's dosage, its operating current is had a greater change when just launching relatively after the several years that works, according to the remote measurement passed down,
It can be modified by being sent to spacecraft through TT＆C antenna by ground control station after being transmitted to space camera by Star Service main frame
Code value scope corresponding to cmos image sensor normal work.When camera controller CPU (70) (TSC695F) receives Star Service main frame
Corresponding to the new cmos image sensor normal work sent during code value scope, nonvolatile storage (90)
(3DEE5M40CS5175) inputs new cmos image sensor normal work pair from camera controller CPU (70) (TSC695F)
The code value scope answered.
By single-particle it is demonstrated experimentally that when locking single particle occurs, GL1216 3.6V supply currents can increase
100mA, if state can not be unlocked, its electric current may proceed to increase to MAX883 current limit threshold 430mA.That is GL1216 and
The lock threshold current minimum of the operating current of its peripheral power supply circuit is 470mA (minimum value 370mA adds 100mA again), its
0.95 times is 446.5mA, the code value 2195 after corresponding A/D conversions.Judge that the code value that sampling obtains is converted to electricity in step 6
Whether minimum value is more than 1.5 times of cmos image sensor running current minimum value or more than lock threshold electric current most after stream
0.95 times of small value, namely judge whether the obtained code value of sampling is more than 2728 or 2195, when more than when judge that there occurs simple grain
Son locking, performs step 7, otherwise performs step 10.
It should be noted that although the various embodiments described above have been described herein, but not thereby limit
The scope of patent protection of the present invention.Therefore, based on the present invention innovative idea, to embodiment described herein carry out change and repair
Change, or the equivalent structure or equivalent flow conversion made using description of the invention and accompanying drawing content, directly or indirectly will be with
Upper technical scheme is used in other related technical areas, is included within the scope of patent protection of the present invention.
Claims (4)
1. a kind of space camera cmos image sensor locks guard system, the system includes DC-DC module (10), magnetic keep after
Electrical equipment (20), precision resistance (30), current-limiting type low-dropout regulator (40), accurate operational amplifier (50), A/D modular converters
(60), camera controller CPU (70), order-driven device (80) and nonvolatile storage (90)；It is characterized in that
The DC-DC module (10) is used for the second voltage that the first voltage that whole star is powered is transformed to space camera and used, and becomes
Second voltage after changing delivers to magnetic latching relay (20), DC-DC module (10) be additionally operable to power to the power supply of whole star and camera into
Row isolation；
The magnetic latching relay (20) is used to open or close relay switch under the control of instruction, senses cmos image
Device is powered on and off；The input of magnetic latching relay (20) switch is the output of DC-DC module (10), is exported to precision resistance
(30)；The input of magnetic latching relay (20) coil is the output of order-driven device (80), when order-driven device exports positive direct-current
During pulse, relay switch is opened, cmos image sensor power-up, when order-driven device exports anti-DC pulse, relay
Switch is closed, cmos image sensor power-off；
The electric current when precision resistance (30) is used to work cmos image sensor is converted into voltage, so as to follow-up amplification
And detection；The input of precision resistance (30) is the output of magnetic latching relay (20), is passed through for the second voltage signal that camera uses
Precision resistance (30) exports afterwards gives current-limiting type low-dropout regulator (40)；The input and output end of precision resistance (30) are sent respectively
To the positive input terminal and negative input end of accurate operational amplifier (50), so that follow-up signal amplifies；
The current-limiting type low-dropout regulator (40) is used for the second electricity used for camera that will be received from precision resistance (30)
Pressure signal is transformed to the voltage that cmos image sensor directly uses, and cmos image sensor is powered；Current-limiting type low voltage difference is adjusted
Whole device (40) is additionally operable to when locking single particle occurs for cmos image sensor, if operating current is adjusted more than current-limiting type low voltage difference
During the cut-off current of whole device (40), current-limiting type low-dropout regulator (40) is by the current limit of output in cut-off current；
The precisely operational amplifier (50) is used to the voltage at precision resistance (30) both ends being amplified, to be changed with A/D
The dynamic range matching of module (60)；The input of accurate operational amplifier (50) is the both ends of precision resistance (30), through precisely fortune
Calculate the voltage after amplifier (50) amplification and deliver to A/D modular converters (60)；
The A/D modular converters (60) are used to the voltage signal of accurate operational amplifier (50) output carrying out analog-to-digital conversion, turn
Digital quantity is changed to, so that camera controller CPU (70) is handled；The input of A/D modular converters (60) is accurate operation amplifier
The output of device (50), the digital quantity obtained after A/D modular converters (60) conversion deliver to camera controller CPU (70)；
The camera controller CPU (70) is used for the digital quantity exported according to A/D modular converters (60), from nonvolatile storage
(90) code value scope corresponding to the cmos image sensor normal work read, and the control received according to Star Service main frame refer to
Order, the powered up and down of magnetic latching relay is controlled by order-driven device (80), realizes the locking to cmos image sensor
Protection；When camera controller CPU (70) receives code corresponding to the new cmos image sensor normal work of Star Service main frame transmission
When being worth scope, code value scope corresponding to cmos image sensor normal work is write into nonvolatile storage (90)；Camera control
Device CPU (70) input includes digital quantity, the CMOS figures read from nonvolatile storage (90) of A/D modular converters (60) output
Code value scope and the control instruction received from Star Service main frame as corresponding to normal operation of sensor；Camera controller CPU (70)
Output be positive direct-current pulse or anti-DC pulse, export and give order-driven device (80)；
It is that positive direct-current pulse or anti-DC pulse enter that the order-driven device (80), which is used for camera controller CPU (70) output,
After row amplification, driving magnetic latching relay (20) work, open or close magnetic latching relay switch；Order-driven device (80)
Input be camera controller CPU (70) output, it is exported to magnetic latching relay (20)；
The nonvolatile storage (90) is used to store code value scope corresponding to cmos image sensor normal work, schemes in CMOS
When being opened as the locking safeguard function of sensor, nonvolatile storage (90) is by code corresponding to cmos image sensor normal work
Value scope is exported to camera controller CPU (70)；When camera controller CPU (70) receives the new CMOS figures of Star Service main frame transmission
As corresponding to normal operation of sensor during code value scope, nonvolatile storage (90) inputs newly from camera controller CPU (70)
Code value scope corresponding to cmos image sensor normal work.
2. a kind of method of space camera cmos image sensor locking protection, it is characterized in that, this method is realized by following steps：
Step 1: after camera controller CPU (70) receives the imaging sign on of Star Service main frame transmission, pass through order-driven device
(80) positive direct-current pulse is sent, magnetic latching relay (20) is closed, performs step 2 afterwards；
Step 2: whole star power supply by magnetic latching relay (20), precision resistance (30) and limits after DC-DC module (10) conversion
Flow pattern low-dropout regulator (40) is powered to cmos image sensor, is started to be imaged, is performed step 3 afterwards；
Step 3: precisely operational amplifier (50) will deliver to A/D modular converters after the voltage difference amplification at precision resistance (30) both ends
(60) step 4, is performed afterwards；
Step 4: camera controller CPU (70) is with the frequency of more than 10 times of cmos image sensor operating current highest vibration frequency
Rate starts A/D conversions, and 2 cmos image sensor operating currents of continuous sampling more than most long period of waves perform step afterwards
Rapid five；
Step 5: the cmos image sensor locking protection that camera controller CPU (70) is sent according to Star Service main frame sets instruction
Judge to lock whether safeguard function is opened, if opened, perform step 6, otherwise perform step 10；
Step 6: camera controller CPU (70) judges that the obtained code value of sampling is converted to whether the minimum value after electric current is more than
1.5 times or 0.95 times more than lock threshold current minimum of cmos image sensor running current minimum value, if
It is to perform step 7, otherwise performs step 10；
Step 7: camera controller CPU (70) sends anti-DC pulse by order-driven device (80), make magnetic latching relay
(20) disconnect, power off cmos image sensor, perform step 8 afterwards；
Step 8: camera controller CPU (70) notifies Star Service host C mos image sensor by remote measurement amount via bus on star
Locked, perform step 9 afterwards；
Step 9: Star Service main frame cuts off power supply of the satellite to whole camera subsystem, camera is set to isolate with other subsystems on star,
Terminate afterwards；
Step 10: camera controller CPU (70) judges whether to have received the imaging out code of Star Service main frame transmission, if it is,
Step 11 is performed, otherwise return to step three；
Step 11: camera controller CPU (70) sends anti-DC pulse by order-driven device (80), make magnetic latching relay
(20) disconnect, power off cmos image sensor, imaging terminates, afterwards return to step one.
3. space camera cmos image sensor according to claim 2 locks means of defence, it is characterized in that, methods described
Including step：
In laboratory to code value model corresponding to cmos image sensor normal work before the Spacecraft Launch that space camera carries
Enclose and demarcated and changed.
4. the method for space camera cmos image sensor locking protection according to claim 2, it is characterized in that, the side
Method includes step：
After the Spacecraft Launch that space camera carries, spacecraft is sent to through TT＆C antenna by ground control station, by Star Service master
Machine is modified after being transmitted to space camera to code value scope corresponding to cmos image sensor normal work.
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