CN100360951C - Method and device for checking remaining quantity of battery - Google Patents
Method and device for checking remaining quantity of battery Download PDFInfo
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- CN100360951C CN100360951C CNB2003101038101A CN200310103810A CN100360951C CN 100360951 C CN100360951 C CN 100360951C CN B2003101038101 A CNB2003101038101 A CN B2003101038101A CN 200310103810 A CN200310103810 A CN 200310103810A CN 100360951 C CN100360951 C CN 100360951C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides a method and device for capable of exactly ascertaining a remaining quantity of a camera battery only by simple control operation, and accurately measuring the remaining quantity of battery irrespective of ambient conditions. The method is a method for checking the remaining quantity of a battery 1 on a camera C provided with a stroboscopic device 4. The remaining quantity of the battery 1 is judged by using the direct current resistance of a primary winding 401a of a step-up transformer 401 for charging the main capacitor of the stroboscopic device 4 and based on the voltage drop by this direct current resistance. The device for checking the remaining quantity of the battery is a device for performing the above method for checking the remaining quantity of the battery, and is provided with a means for measuring the voltage drop value based on the the direct current resistance value of the primary winding 401a, and a determining means (CPU 2 or the like) for determining the remaining quantity of the battery 1 based on the measured voltage drop value.
Description
Technical field
The present invention relates to detect the detection method and the device thereof of the camera battery surplus in the camera (comprising silver halide photography machine, digital camera) with flash unit.
Background technology
As camera with the flash unit that comprises the circuit that is used to measure residual capacity of battery, following structure be known to (referring to Patent Document 1): shared charging circuit for flashlamp and remaining battery quantitative determination circuit, when flashlight charging, by the on-off element conducting is ended, flashlamp illuminating main capacitor is charged, when measuring residual capacity of battery, to above-mentioned on-off element, give the control signal of representing to stipulate resistance value with this on-off element, make corresponding to the electric current of the resistance value in the unsaturated district of this element part by charging circuit for flashlamp and flow to battery, to detect this residual capacity of battery.
Patent documentation 1
The spy open the 2002-23230 communique (paragraph 11, Fig. 3)
Summary of the invention
But,, when measuring residual capacity of battery,, need to use the bigger constant-current circuit of circuit scale for the electric current that makes a part by charging circuit for flashlamp flow to battery keeps certain to above-mentioned known residual capacity of battery testing circuit.Thereby can't avoid the rising of cost.And flow to constitute boosting of a charging circuit for flashlamp part and change this current value with the impedance of the secondary side of this transformer with the electric current of the primary side of transformer.In addition, also change with the size of residual capacity of battery or the size of environment temperature or internal resistance etc.Therefore, for satisfying full terms, carry out extremely complicated Current Control and also just become very necessary.
The present invention proposes in view of the situation, and its purpose is to provide remaining battery quantity measuring method and the device thereof with following advantage:
(a) only carry out simple control operation, just can grasp the camera battery surplus reliably.
(b), all can accurately measure the camera battery surplus regardless of environmental conditions.
Invention 1 relates to a kind of remaining battery quantity measuring method, described remaining battery quantity measuring method detects the residual capacity of battery in the camera with flash unit, described flash unit has: main capacitor, with the step-up transformer that is used for to described main capacitor charging, described remaining battery quantity measuring method is characterised in that, make on-off element conducting with a windings in series of described step-up transformer, time after the current fluctuation of flowing through in a winding of described step-up transformer is stable, measure the voltage between the two ends of a winding of this step-up transformer, according to the voltage between the two ends of a winding of described step-up transformer and the dc resistance of a described winding, the current value that calculating is flow through in this winding, according to the performance data of this result of calculation and applied described battery, judge described residual capacity of battery.
Description of drawings
Fig. 1 is the block scheme of the inner structure of the summary camera of representing the 1st embodiment of the present invention.
Fig. 2 is a circuit diagram of representing the particular circuit configurations of flash unit of the 1st embodiment of the present invention and battery 1 and CPU2 simultaneously.
Fig. 3 is the charging action sequence synoptic diagram to main capacitor in the flash unit of the 1st embodiment of the present invention.
Fig. 4 is the action sequence synoptic diagram when measuring residual capacity of battery with the charging circuit of the flash unit of the 1st embodiment of the present invention.
Fig. 5 is the family curve synoptic diagram of the relation of corresponding cell voltage of the electric current that flows through in the charging circuit with the flash unit of the 1st embodiment of the present invention and battery life.
Fig. 6 is the process flow diagram of the residual capacity of battery decision procedure in the remaining battery quantity measuring method of the 1st embodiment of the present invention.
Fig. 7 is the particular circuit configurations of the flash unit of representing the 2nd embodiment of the present invention simultaneously (using flyback type step-up transformer) and the circuit diagram of battery and CPU.
Fig. 8 is the action sequence synoptic diagram when measuring residual capacity of battery with the charging circuit of the flash unit of the 2nd embodiment of the present invention
Embodiment
(the 1st embodiment)
Fig. 1 is the block scheme of inner structure of roughly representing the camera C of the 1st embodiment of the present invention.As shown in Figure 1, this camera C has: battery 1 is used as the power supply of camera; CPU (central processing unit) 2 is used to carry out the control of camera integral body; Memory storage 3 is used to store frame number or the various adjusted value data that the camera C photography is finished; Flash unit 4, the auxiliary power supply of using of the photography when being used as low-light level; Switch input circuit 5 is used to import the signal from switches such as power switch or shutter release switch; Light measuring circuit 6 is used to measure the light quantity of subject; Range-measuring circuit 7 is used to measure the distance between camera and the subject; Take-up device 8 is used to carry out the just volume and the reviewing of film; Shutter device 9 is used to carry out the exposure control of film; Display device 10 is used to carry out various demonstrations.
In camera C shown in Figure 1, when the signal from shutter release switch is input to CPU2 by switch input circuit 5, be included in the device for detecting residual capacity of battery action in this CPU2 and the flash unit 4, detect the surplus of battery 1.The result that residual capacity of battery detects when the residual capacity of battery of battery 1 only is left to carry out the amount of frame photography, carries out on display device 10 in the demonstration of running down of battery, finishes photography.When the remaining ratio photography of residual capacity of battery one frame was more measured, the brightness of subject was measured in light measuring circuit 6 actions.Meanwhile, range-measuring circuit 7 moves, and is measured to the distance of subject.
CPU2 utilizes the measurement result by above-mentioned light measuring circuit 6 and range-measuring circuit 7 gained, and is stored in the various adjusted value data in the memory storage 3 in advance, calculates the time shutter of film.And, carried out wanting or not luminous decision, shutter speed and the f-number of flashlamp setting, regulate the required lens driving of focus etc. after, make shutter device 9 actions, film is exposed.Behind end exposure to film, be as the criterion and get a shot ready, take-up device 8 is given and the command signal of just rolling up a frame, carry out the just volume of film.
Fig. 2 represents the particular circuit configurations of flash unit 4 and the circuit diagram of battery 1 and CPU2 simultaneously.The charging of the main capacitor of the flash unit 4 shown in Fig. 2 is the forward type step-up transformers that are used to make the boost in voltage of battery 1 with step-up transformer 401, and its winding 401a is connected to battery 1 by on-off element 402.On-off element 402 is made of mosfet transistor, and according to the control signal from lead-out terminal 205 outputs of CPU2, the conducting of electric current that flows to a winding 401a is by control.The Secondary Winding 401b of step-up transformer 401 prevents to apply the diode 403 of reverse voltage by double as, is connected on the charging voltage testing circuit CD of be connected in series two divider resistances 404 and 405.Above-mentioned charging voltage testing circuit CD stops with diode 406 by inverse current, and is in parallel with the main capacitor 410 that is used to put aside luminous energy.
(IGBT: insulated gate polar form bipolar transistor) 412 series circuit is in parallel the on-off element of above-mentioned main capacitor 410 and the conducting cut-off state of xenon lamp 411 that illumination is mapped to subject and control glow current.At two interpolars of xenon lamp 411, connecting the resistance 413 that is used for to trigger circuit TG supply power.
Above-mentioned on-off element 412 be used for that xenon lamp 411 is applied winding 414a of trigger winding 414 of high-tension trigger circuit TG and the series circuit of energy savings electricity consumption container 415 is in parallel.The end of the Secondary Winding 414b of trigger winding 414 is connected to the trigger electrode 411c of the outer wall that is configured in xenon lamp 411, and the other end is connected to the minus side terminal (emitter of NPN transistor) of on-off element 412.And the trigger electrode 411c of xenon lamp 411 is made of the transparency electrode that is called as nesacoat, and it is all that this nesacoat is overlayed on the periphery that produces the arc discharge part in the xenon lamp 411.
CPU2 has and is used to accept the terminal 201,202 supplied with from the power supply of battery 1.In addition, also have terminal 203, be used to import the positive voltage of battery 1, so that the supply voltage of inwardly establishing is measured circuit (not shown) supply line voltage., also have: input terminal 204 is used to import an above-mentioned winding 401a and conducting by the voltage of control with the tie point P of on-off element 402 in addition; Lead-out terminal 205 is used for ending control signal to the control utmost point output conducting of above-mentioned on-off element 402; Input terminal 206 is used for two divider resistances 404 of input charging voltage testing circuit CD and the voltage of 405 tie point Q, so that measure the charging voltage of main capacitor 410; Lead-out terminal 207 is used for to the control utmost point output control signal of glow current control with on-off element 412; And other terminals etc.
Fig. 3 is the charging action sequence synoptic diagram of the main capacitor 410 in the flash unit 4 of structure as mentioned above.As shown in Figure 3, by control signal S205, and when being applied to the control utmost point of on-off element 402, on-off element 402 beginning conductings end from the lead-out terminal 205 output conductings of CPU2.
When on-off element 402 when time point t1 is conducting, by a winding 414a, the on-off element 402 of power supply 1, step-up transformer 401 constitute closed circuit in flow through electric current.So, act on the electric energy that induces among the Secondary Winding 401b of step-up transformer 401 after boosting by electromagnetic induction.The electric energy of being responded in Secondary Winding 401b flows in this Secondary Winding 401b, diode 403, diode 406, main capacitor 410 closed circuit.Thereby, in main capacitor 410, charging with the official hour constant, the voltage V410 between the two ends of main capacitor 410 rises.
When on-off element 402 time point t2 by the time, the electric current that flows to a winding 401a of step-up transformer 401 is cut off.At this moment, in a winding 401a of step-up transformer 401, produce and the opposite electric energy of electric energy direction that was produced just now.Therefore, by the electromagnetic induction effect, in the Secondary Winding 401b of oscillation transformer 401, induce therewith the place ahead to opposite electric energy.But, owing on the Secondary Winding 401b of step-up transformer 401, be in series with the diode 403 of direction as shown, do not have electric current to flow through at the secondary side of step-up transformer 401.On the other hand, produce reverse high voltage, make to discharge reciprocal energy by anode-side at diode 403.By the release of this reciprocal energy, charging circuit returns original state.
So, export the conducting control signal and, the charging voltage V410 of main capacitor 410 is risen gradually with the cycle of regulation by lead-out terminal 205 by control signal from CPU2.
The charging voltage V410 of main capacitor 410 is detected by the charging voltage testing circuit CD that is made of a pair of divider resistance 404,405.That is with the proportional voltage of charging voltage V410 (current potential) of the main capacitor 410 that on the tie point Q of divider resistance 404,405, produces, as detecting voltage V206, supply with the input terminal 206 of CPU2.Therefore, measure circuit (not shown), determine the value of the charging voltage V410 of main capacitor 410 by the interior charging voltage that is located in the CPU2.Utilize inverse current to stop, stop the electric charge of savings in main capacitor 410 to flow out by resistance 404,405 with diode 406.
The resistance ratio of resistance 404 and resistance 405 be set to the charging of main capacitor 410 stop voltage and in be located at charging voltage among the CPU2 and measure the identical ratio of ratio between the reference voltage of circuit (not shown).Thereby the charging voltage V410 of main capacitor 410 for example stops magnitude of voltage V when reach charging at time point t3
sThe time, detect voltage V206 and surpass the reference voltage that charging voltage is measured circuit (not shown), from said determination circuit output charging stop signal.This charging stop signal is supplied with the control end of on-off element 402 from lead-out terminal 205.Thereby on-off element 402 ends action at time point t3 stop conducting.
So, by exporting conducting periodically from the terminal 205 of CPU2 by control signal S205, electric charge is put aside in main capacitor 410, becomes charging at the charging voltage V410 of main capacitor 410 and stops magnitude of voltage V
sThe time, the charging release.
Secondly, the luminous action to flash unit 4 describes.As original state, the voltage V410 of main capacitor 410 be in may be luminous charged state, in the capacitor 415 of trigger circuit TG, savings has the identical electric charge of voltage and main capacitor 410.At this state, when the lead-out terminal 207 from CPU2 sends the beginning luminous signal, on-off element 412 conductings.Therefore, the electric charge of savings in capacitor 415 a winding 414a by this capacitor 415, on-off element 412, trigger winding 414 forms closed circuit in mobile.So by the electromagnetic induction effect, induction electric energy in the Secondary Winding 414b of trigger winding 414.
The electric energy of responding in Secondary Winding 414b supplies to the trigger electrode 411c of xenon lamp 411.Because forming the glass tube of the outer wall of xenon lamp 411 is insulators, the above-mentioned electric energy that supplies to the trigger electrode 411c of xenon lamp 411 almost all is transformed to magnitude of voltage, and the result applies high voltage in the glass tube periphery of xenon lamp 411.Therefore the xenon in the xenon lamp 411 is energized, and this gas becomes electric conductor from insulator.Therefore the electric charge of savings in main capacitor 410, forms by this capacitor 410, xenon lamp 411, on-off element 412 closed circuit in mobile, xenon lamp 411 begins luminous.
After beginning is luminous, the time point after the process stipulated time, when lead-out terminal 207 outputs from CPU2 stopped luminous signal, on-off element 412 ended.Therefore the electric current that flows to xenon lamp 411 is cut off luminous stopping.Behind luminous the stopping of xenon lamp 411, the voltage of the cathode side of xenon lamp 411 progressively rises to the voltage identical with the voltage of anode-side.Therefore, when end is luminous, finish the charging of capacitor 415, return original state.
Fig. 4 is the action sequence synoptic diagram when measuring the residual capacity of battery of battery 1 with the charging circuit of above-mentioned flash unit 4.At time point t11, when from the lead-out terminal 205 output Continuity signal S205 of CPU2, the situation during with above-mentioned charging is identical, on-off element 402 conductings.Therefore from power supply 1 to a winding 401a, on-off element 402 by step-up transformer 401 form closed circuit flow through primary side current I402.At this moment, the peak value of above-mentioned primary side current is subjected to the influence of the secondary side impedance of step-up transformer 401.That is the peak value of above-mentioned primary side current becomes big when the recharge voltage level of main capacitor 410 is hanged down, and the recharge voltage level of main capacitor 410 diminishes when higher,
As the primary side current I402 that flows to above-mentioned on-off element 402, that is the electric current that flows to a winding 401a of step-up transformer 401 is when changing, by the electromagnetic induction effect, in the Secondary Winding 401b of step-up transformer 401, induce electric energy, main capacitor 410 is charged.Flow to the secondary side current of the secondary side of step-up transformer 401, that is it is proportional to flow to one of the transformer number of turns score { 1/. (a number of turn/secondary number of turn) } of the electric current I 403 of diode 403 and the current value that flows to a winding 401a after on-off element 402 actions immediately.Be accompanied by the release of the energy that is produced in a winding 401a, secondary side current I403 reduces, and secondary side current I403 disappears when energy disappears.At this moment, primary side current I402 not with the ratio that is reduced to of secondary side current I403, Yi Bian reduce some, Yi Bian continue to flow.At time point t12, when secondary side current I403 disappeared, step-up transformer 401 became and can not play function as transformer.That is a winding 401a becomes simple resistance, and primary side current I402 is up to increasing to certain level I
sTill.
When a winding 401a becomes simple resistance, supply to the voltage of battery 1 of the input terminal 203 of CPU2, measure circuit (not shown) by the supply voltage of CPU2 and measure.And, according to the voltage that supplies to terminal 204, measure the voltage between the two ends of on-off element 402.
Supply to the terminal 203 of CPU2 and 204 voltage by mensuration, obtain the voltage between the two ends of a winding 401a of step-up transformer 401,, judge the residual capacity of battery of battery 1 according to the voltage between the two ends of a winding 401a who is obtained.
The time point t13 that finishes in the acts of determination of above-mentioned residual capacity of battery, when from the lead-out terminal 205 of CPU2 to on-off element 402 outputs during by control signal, this on-off element 402 ends, and cuts off the electric current I 402 that flows to a winding 401a.
Herein, the method for judging residual capacity of battery is described.For judging residual capacity of battery, at first must detect the electric current that flows through among the winding 401a of the step-up transformer 401 in flash unit 4.Therefore, measure the dc resistance of a winding 401a of step-up transformer 401 in advance, and store in the memory storage 3.And, poor (V403-V404) between the voltage of the voltage of the input terminal 203 of utilization supply CPU2 and the input terminal 204 of supply CPU2, and the dc resistance R401 that is stored in a winding 401a in the above-mentioned memory storage 3, according to following formula, obtain the electric current I 401 that in a winding 401a of step-up transformer 401, flows through, the i.e. electric current that in the charging circuit of flash unit 4, flows through
I401＝(V403-V404)/R401
Current value that flows through among the winding 401a according to the step-up transformer of obtaining by above-mentioned formula 401 and the data characteristic that is stored in this battery 1 among the CPU2, the residual capacity of battery of judgement battery 1.The time point t13 that finishes in the acts of determination of above-mentioned residual capacity of battery, when by the lead-out terminal 205 of CPU2 to on-off element 402 outputs during by control signal, on-off element 402 ends, and cuts off the electric current I 402 that flows to a winding 401a.
Fig. 5 is that expression is stored in the data among the CPU2, that is the performance diagram of the relation of cell voltage corresponding with the electric current that flows to charging circuit and battery life.1A, 2A, 3A are illustrated in when measuring residual capacity of battery among the figure, the current value that flows through in the charging circuit of flash unit 4.In addition, the AL on the transverse axis of expression battery life is the last warning line seldom of expression residual capacity of battery, and RL is that residual capacity of battery does not almost have, the camera action lock-in line when causing camera C to be failure to actuate.
By utilizing the performance plot of Fig. 5, can judge whether reach warning line AL by residual capacity of battery (surplus is less than about 20%, urge the horizontal line of replacing battery as early as possible) or camera action lock-in line RL (be the horizontal line that residual capacity of battery can not be photographed, be the camera action that locking comprises the shutter release movement, forbid the horizontal line of photographing).
The result of determination of above-mentioned residual capacity of battery is shown by display device 10, is communicated to the user of camera C.
Fig. 6 is the process flow diagram of expression residual capacity of battery decision procedure.According to process flow diagram shown in Figure 6, the residual capacity of battery decision procedure is described.
Step ST1: enter remaining battery quantitative determination subroutine, the acts of determination of beginning residual capacity of battery.
Step ST2: after entering remaining battery quantitative determination subroutine, from the lead-out terminal 205 output conducting control signals of CPU2, on-off element 402 conductings.
Step ST3: after on-off element 402 conductings, standby is up to the process certain hour.That is wait for the function of a winding 401a end of step-up transformer 401 as coil, become simple direct current resistance.Through after the regular hour, enter step ST4.
Step ST4: owing to a winding 401a through step-up transformer 401 behind the certain hour works as simple direct current resistance.Therefore according to the voltage that is applied to the input terminal 203 of CPU2, carry out the mensuration of the magnitude of voltage of battery 1.
Step ST5:, be determined at the pressure drop that produces on the on-off element 402 according to the voltage of the input terminal 204 that is applied to CPU2.
Step ST6: in CPU2, each magnitude of voltage of having measured according to the dc resistance of a winding 401a who is stored in the step-up transformer 401 in the memory storage 3 with at step ST4 and step ST5 poor, by calculating, obtain the current value that in a winding 401a of step-up transformer 401, flows through.
Step ST7:, obtain residual capacity of battery according to current value of obtaining at step ST6 and battery behavior.
Step ST8: judge whether residual capacity of battery is below the lock-in line RL.When surpassing lock-in line RL, enter step ST9, when lock-in line RL is following, enter step ST12.
Step ST9: judge whether residual capacity of battery is below the warning line AL.When residual capacity of battery surpasses the warning line, enter step ST10, when warning line AL is following, enter step ST11.
Step ST10: when residual capacity of battery surpasses the warning line, mean that with display device 10 residual capacity of battery is the demonstration of OK, enters step ST14.
Step ST11:, mean with display device 10 demonstration of residual capacity of battery below the warning line to enter step ST14 when residual capacity of battery is when warning line following.
Step ST12: at step ST8, when judging that residual capacity of battery is lock-in line RL when following, means with display device 10 demonstration that battery uses up to enter step ST13.
Step ST13: the action of locking camera, photography is forbidden, enter step ST14.
Step ST14: return after the sub-routine ends.
As described above like that, the 1st embodiment is used in residual capacity of battery testing circuit as the battery 1 of camera power supply to the charging circuit of flash unit 4.That is, it has such structure: when detecting residual capacity of battery, make on-off element 402 conductings of a winding 401a who is connected in series to step-up transformer 401, through behind the certain hour, that is the time point of the current fluctuation of in an above-mentioned winding 401a, flowing through after stable, carry out the detection of residual capacity of battery.That is utilize the dc resistance of a winding 401a of step-up transformer 401, according to the voltage drop value of determining by this dc resistance, judge the surplus of battery 1.Thereby, can not be subjected to the secondary side impedance isoperimetric of the step-up transformer 401 of flash unit 4 to enclose condition effect, correctly measure the surplus of battery 1.And, also needn't prepare special circuit component in addition, just can implementation structure simple and low-cost.
(the 2nd embodiment)
Fig. 7 represents the particular circuit configurations of the flash unit 4 ' in the camera C of the 2nd embodiment of the present invention and the circuit diagram of battery 1 and CPU2 simultaneously.Be at the flash unit 4 ' of the 2nd embodiment shown in this Fig. 7 main difference point, use the step-up transformer of flyback type step-up transformer 421 as the boost in voltage that is used to make battery 1 with the flash unit 4 of the 1st embodiment shown in Fig. 2.Having used the charging circuit of flyback type step-up transformer 421, by flow through electric current in a winding 421a of step-up transformer 421, is magnetic energy with transformation of electrical energy, puts aside in the heart in transformer fe temporarily.And, from cutting off the moment of primary current, transmit energy to the Secondary Winding 421b of step-up transformer 421, in main capacitor 410, put aside electric energy.And, in Fig. 7, give same label to having with the part of Fig. 2 identical function.
Fig. 8 is that expression utilizes the charging circuit with flyback type step-up transformer 421 shown in Figure 7, the action timing diagram when measuring the residual capacity of battery of battery 1.
From the lead-out terminal 205 of CPU2 when the time point t21 output conducting control signal S205, on-off element 402 conductings, a winding 421a, on-off element 402 by battery 1, step-up transformer 421 form closed circuit in flow through electric current I 402.This electric current I 402 as shown in Figure 8, increases progressively to the right when initial in certain proportion according to the internal resistance value of battery 1, the resistive component of on-off element 402, the resistive component and the inductive component of step-up transformer 421.Produce electric energy by the variation of this current value, this electric energy is transformed to magnetic energy, and savings in the transformer fe of step-up transformer 421 in the heart.There is limit in the magnetic energy of putting aside in the heart in transformer fe.At the time point t22 that surpasses this limit, a winding 421a of step-up transformer 421 becomes the function that can not play as coil, only flows through electric current as simple resistance.
When becoming such state, identical with the 1st embodiment, according to voltage V203, the V204 of the input terminal 203 that is applied to CPU2 and 204, the voltage between the two ends of a winding 421a of mensuration step-up transformer 421.And, obtain the electric current that in a winding 421a of step-up transformer 421, flows through, that is the current value that flows through in the charging circuit of flash unit 4 ', according to this current value and battery behavior, judge the residual capacity of battery of battery 1.
The time point t23 that finishes in the acts of determination of above-mentioned residual capacity of battery, when from 205 pairs of on-off elements of lead-out terminal, 402 outputs of CPU2 during by control signal, on-off element 402 ends, and the electric current I 402 that flows through in a winding 421a is cut off.When the electric current of a winding 421a was cut off, so far the magnetic energy of putting aside in the heart in the transformer fe of step-up transformer 421 was transformed to electric energy, flow through electric current I 403 in Secondary Winding 421b.The current value of this electric current I 403 is very little, and disappears at short notice.Therefore the influence to the charging voltage of main capacitor 410 does not almost have.And, because the decision flowchart of the residual capacity of battery of the camera C of the 2nd embodiment and the 1st embodiment is identical, so give omission.
So, as step-up transformer,, also can play the action effect same with the 1st embodiment even in the camera of the 2nd embodiment that utilizes flyback type step-up transformer 421.
(unique point in the embodiment)
[1] be the remaining battery quantity measuring method that a kind of detection has the surplus of the battery 1 in the camera C of flash unit 4 in the detection method of the residual capacity of battery shown in the embodiment, it is characterized in that:
Utilize the direct current resistance of the main capacitor charging of above-mentioned flash unit 4,, judge the surplus of above-mentioned battery 1 according to the voltage drop value that causes by this direct current resistance with a winding 401a of step-up transformer 401.
In above-mentioned remaining battery quantity measuring method, owing to utilize the direct current resistance of a winding 401a, according to the voltage drop value that causes by this direct current resistance, to judge the surplus of above-mentioned battery 1, therefore the impedance isoperimetric at the secondary side that can not be subjected to step-up transformer 401 encloses under the situation of condition effect, only carry out simple control operation, just can judge the residual capacity of battery of camera reliably.
[2] be the remaining battery quantity measuring method that a kind of detection has the surplus of the battery 1 in the camera C of flash unit 4 in the detection method of the residual capacity of battery shown in the embodiment, it is characterized in that:
Time after the current fluctuation of flowing through in the winding 401a of main capacitor charging with step-up transformer 401 of above-mentioned flash unit 4 is stable, measure the voltage between the two ends of a winding 401a of this step-up transformer 401, according to this measurement result, judge the surplus of above-mentioned battery 1.
In above-mentioned remaining battery quantity measuring method, lose the transformer function in fact at a winding 401a of step-up transformer 401 and become the time point of simple direct current resistance, carry out the mensuration of the voltage between the two ends of a winding 401a, so play the action effect identical with [1].
[3] be the remaining battery quantity measuring method that a kind of detection has the surplus of the battery 1 in the camera C of flash unit 4 in the detection method of the residual capacity of battery shown in the embodiment, it is characterized in that:
Make the main capacitor charging that is connected in series to above-mentioned flash unit 4 on-off element 402 conductings of a winding 401a of step-up transformer 401, time after the current fluctuation of flowing through in a winding 401a of above-mentioned step-up transformer 401 is stable, measure the voltage between the two ends of a winding of this step-up transformer, according to this measurement result, judge above-mentioned residual capacity of battery.
In above-mentioned remaining battery quantity measuring method, the main capacitor charging that makes flash unit 4 ends the conducting of controlling with on-off element 402 with a winding 401a of step-up transformer 401 with conducting and is associated, thereby carry out the mensuration of the voltage between the two ends of a winding 401a, therefore reach and [1] or [2] same action effect.
[4] detection method at the residual capacity of battery shown in the embodiment is above-mentioned [2] or [3] described remaining battery quantity measuring method, it is characterized in that:
Carrying out having certain relevant operation (for example conducting of on-off element 402) afterwards with the boost action of above-mentioned step-up transformer 401, the time after stablizing as the current fluctuation of in a winding 401a of above-mentioned step-up transformer 401, flowing through through the time behind the certain hour, carry out the mensuration of the voltage between the two ends of a winding 401a of this step-up transformer 401.
In above-mentioned remaining battery quantity measuring method, by measuring the elapsed time after for example lighting from the conducting start time of on-off element 402, can infer the time of the current fluctuation of in a winding 401a, flowing through when stablizing, therefore can be easy and carry out the detection of residual capacity of battery rightly.
[5] detection method at the residual capacity of battery shown in the embodiment is any one described remaining battery quantity measuring method of above-mentioned [1] to [4], it is characterized in that:
According to by the voltage between the two ends of a winding 401a of the resulting above-mentioned step-up transformer 401 of said determination, and the dc resistance of an above-mentioned winding 401a, calculate the current value that in this winding 401a, flows through, according to the performance data of this result of calculation and applied above-mentioned battery, judge the surplus of this battery 1.
In above-mentioned remaining battery quantity measuring method, after the voltage between the two ends of measuring a winding 401a, reflect the detection of the residual capacity of battery of this battery behavior, therefore can carry out the higher detection of precision.
[6] detection method at the residual capacity of battery shown in the embodiment is the remaining battery quantity measuring method described in above-mentioned [5], it is characterized in that:
Measure the dc resistance of an above-mentioned winding 401a in advance, this measurement result is stored in the memory storage 3 as winding data, read the winding data of being stored at official hour, use when calculating the current value that in an above-mentioned winding 401a, flows through.
In above-mentioned remaining battery quantity measuring method, can carry out that the measured value of the direct current resistance of a winding 401a is applied to residual capacity of battery computing, that precision is very high and detect.
[7] be the device for detecting residual capacity of battery that a kind of detection has the surplus of the battery 1 in the camera C of flash unit 4 at the device for detecting residual capacity of battery shown in the embodiment, it is characterized in that having:
Determinator, mensuration is based on the voltage drop value of the dc resistance of a winding 401a of the main capacitor charging usefulness step-up transformer 401 of above-mentioned flash unit 4;
Decision maker (CPU2) according to the voltage drop value of measuring by this determinator, is judged the surplus of above-mentioned battery 1.
In above-mentioned device for detecting residual capacity of battery, can be easily and implement the remaining battery quantity measuring method of above-mentioned [1] reliably.
[8] be the device for detecting residual capacity of battery that a kind of detection has the surplus of the battery 1 in the camera C of flash unit 4 at the device for detecting residual capacity of battery shown in the embodiment, it is characterized in that having:
Time detection device (CPU2 etc.) is used for detecting the time after the current fluctuation that the main capacitor charging of above-mentioned flash unit 4 is flow through with a winding 401a of step-up transformer 401 is stablized;
Winding voltage determinator (CPU2, V203, V204 etc.) with the stipulated time that this time detection device detected, is measured the voltage between the two ends of a winding 401a of above-mentioned step-up transformer 401;
Decision maker (CPU2 etc.) according to the measurement result of this winding voltage determinator, is judged the surplus of above-mentioned battery 1.
In above-mentioned device for detecting residual capacity of battery, can be easily and implement the remaining battery quantity measuring method of above-mentioned [2] reliably.
[9] be the device for detecting residual capacity of battery that a kind of detection has the surplus of the battery 1 in the camera C of flash unit 4 at the device for detecting residual capacity of battery shown in the embodiment, it is characterized in that having:
Conducting device S205 makes a winding 401a switch in series 402 conductings of using step-up transformer 401 in the main capacitor charging of above-mentioned flash unit 4;
Time detection device (CPU2 etc.) by with the above-mentioned on-off element 402 after this conducting device conducting, detects the time after the current fluctuation that a winding 401a of above-mentioned step-up transformer 401 flows through is stable;
Winding voltage determinator (CPU2, V203, V204 etc.) with the time that this time detection device detected, is measured the voltage between the two ends of a winding 401a of above-mentioned step-up transformer 401;
Decision maker (CPU2 etc.) according to the measurement result of this winding voltage determinator, is judged the surplus of above-mentioned battery 1.
In above-mentioned device for detecting residual capacity of battery, can be easily and implement the remaining battery quantity measuring method of above-mentioned [3] reliably.
[10] be above-mentioned [8] or [9] described device for detecting residual capacity of battery at the device for detecting residual capacity of battery shown in the embodiment, it is characterized in that:
Above-mentioned time detection device (CPU2 etc.) is carrying out having certain relevant operation (for example conducting of on-off element 402) afterwards with the boost action of above-mentioned step-up transformer 401, the time behind the process certain hour, time as the current fluctuation of in a winding 401a of above-mentioned step-up transformer 401, flowing through after stable, detect.
In above-mentioned device for detecting residual capacity of battery, can be easily and implement the remaining battery quantity measuring method of above-mentioned [4] reliably.
[11] be any one described device for detecting residual capacity of battery of above-mentioned [7] to [10] at the device for detecting residual capacity of battery shown in the embodiment, it is characterized in that,
Above-mentioned decision maker (CPU2 etc.) has:
Calculation element (CPU2 etc.), according to as above-mentioned winding voltage determinator (CPU2, V203, voltage between the two ends of a winding 401a of the above-mentioned step-up transformer 401 of measurement result V204 etc.) and the dc resistance of this winding 401a calculate the current value that flows through in this winding 401a;
Decision maker (CPU2 etc.) according to the result of calculation of this calculation element and the performance data of applied above-mentioned battery 1, is judged the surplus of this battery 1.
In above-mentioned device for detecting residual capacity of battery, can be easily and implement the remaining battery quantity measuring method of above-mentioned [5] reliably.
[12] be any one described device for detecting residual capacity of battery of above-mentioned [7] to [11] at the device for detecting residual capacity of battery shown in the embodiment, it is characterized in that,
Above-mentioned step-up transformer 401 is forward type step-up transformers.
[13] be any one described device for detecting residual capacity of battery of above-mentioned [7] to [11] at the device for detecting residual capacity of battery shown in the embodiment, it is characterized in that,
Above-mentioned step-up transformer 401 is flyback type step-up transformers.
[14] in the camera C shown in the embodiment, it is characterized in that,
Any one described device for detecting residual capacity of battery with above-mentioned [7] to [13].
[15] at the camera shown in the embodiment, be a kind of camera C with flash unit 4, this flash unit 4 has: step-up transformer 401, the voltage of the battery 1 that is used as the camera power supply of being used to boost; Capacitor 410 is applied in the voltage after boosting with this step-up transformer 401, and the savings electric charge; Xenon lamp 411 is a luminous energy with the charge-voltage converting of savings in this capacitor 410, towards the subject ray, it is characterized in that,
Has decision maker (CPU2 etc.), when putting aside above-mentioned electric charge in above-mentioned capacitor 410, by on-off element 402 make above-mentioned step-up transformer 401 periodically conducting end, when judging the surplus of above-mentioned battery 1, make above-mentioned on-off element 402 conductings, through behind the certain hour, judge the surplus of above-mentioned battery 1.
In above-mentioned camera, can be the charging circuit of the capacitor of flash unit 4 as residual capacity of battery detection road, and, only carry out simple control operation, except that grasping the surplus of camera battery reliably, can also all can measure residual capacity of battery exactly regardless of environmental conditions.The camera of small low-cost can be provided in addition.
[16] be camera C at the camera shown in the embodiment with following structure, utilize the main capacitor charging step-up transformer 401 of flash unit 4, voltage to the battery 1 that is used as the camera power supply boosts, thereby above-mentioned main capacitor 410 is charged, it is characterized in that having:
Winding voltage determinator (CPU2, V203, V204 etc.), the time point after the current fluctuation of flowing through in a winding 401a of above-mentioned step-up transformer 401 is stable is measured the voltage between the two ends of a winding 401a of this step-up transformer 401;
Decision maker (CPU2 etc.) according to the measurement result of this winding voltage determinator, is judged the surplus of above-mentioned battery 1.
In above-mentioned camera, utilize the direct current resistance of the main capacitor charging of flash unit 4 with a winding 401a of step-up transformer 401, just can carry out the detection of residual capacity of battery, and only carry out simple control operation, just can grasp the surplus of camera battery reliably, and, can both measure residual capacity of battery exactly regardless of environmental conditions.
(variation)
Include following variation at the device for detecting residual capacity of battery shown in the embodiment.
As on-off element 402, except that MOS FET, can utilize following device, for example common PNP transistor and NPN transistor and other thyristor.
Be applied to the device for detecting residual capacity of battery of digital camera.
The invention effect
According to the present invention, can provide remaining battery quantity measuring method with following effects effect and Device.
(a) the main capacitor charging that utilizes the flash lamp device is straight with a winding of step-up transformer Stream resistance carries out residual capacity of battery and detects, and therefore only simply controls operation, just can Grasp the residue amount of camera battery by ground.
(b) because not to be subjected to around the secondary side impedance etc. of step-up transformer the impact of condition just passable Measure, therefore regardless of ambient conditions, can both accurately measure the residue amount of camera battery.
Claims (4)
1. remaining battery quantity measuring method, described remaining battery quantity measuring method detects the residual capacity of battery in the camera with flash unit, described flash unit has: main capacitor, with the step-up transformer that is used for to described main capacitor charging, described remaining battery quantity measuring method is characterised in that
Make on-off element conducting with a windings in series of described step-up transformer, time after the current fluctuation of flowing through in a winding of described step-up transformer is stable, measure the voltage between the two ends of a winding of this step-up transformer, according to the voltage between the two ends of a winding of described step-up transformer and the dc resistance of a described winding, the current value that calculating is flow through in this winding, according to the performance data of this result of calculation and applied described battery, judge described residual capacity of battery.
2. remaining battery quantity measuring method as claimed in claim 1 is characterized in that,
Measure the dc resistance of a described winding in advance, this measurement result is stored in the memory storage as winding data, read the winding data of having stored at the appointed time, use when calculating the current value that flows through in the described winding.
3. device for detecting residual capacity of battery, described device for detecting residual capacity of battery detects the residual capacity of battery in the camera with flash unit, described flash unit has: main capacitor, with the step-up transformer that is used for to described main capacitor charging, described device for detecting residual capacity of battery is characterised in that
Have:
Conducting device, it makes the on-off element conducting with a windings in series of described step-up transformer;
Time detection device, it detects the time after the current fluctuation of flowing through is stablized in a winding of described step-up transformer;
Determinator, it measures the voltage drop value based on the dc resistance of a winding in the described step-up transformer;
Calculation element, it calculates the current value that flows through in this winding according to as the voltage drop value of the dc resistance of a winding in the described step-up transformer of the measurement result of described determinator and the dc resistance of this winding; And
Decision maker, it judges the surplus of this battery according to the result of calculation of this calculation element and the performance data of applied described battery.
4. device for detecting residual capacity of battery as claimed in claim 3 is characterized in that,
Described step-up transformer is forward type step-up transformer or flyback type step-up transformer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002322818A JP2004157320A (en) | 2002-11-06 | 2002-11-06 | Method and device for checking remaining quantity of battery |
| JP322818/2002 | 2002-11-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1554955A CN1554955A (en) | 2004-12-15 |
| CN100360951C true CN100360951C (en) | 2008-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101038101A Expired - Fee Related CN100360951C (en) | 2002-11-06 | 2003-11-06 | Method and device for checking remaining quantity of battery |
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| Country | Link |
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| JP (1) | JP2004157320A (en) |
| CN (1) | CN100360951C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5996286B2 (en) * | 2012-06-12 | 2016-09-21 | オリンパス株式会社 | External strobe device and imaging device |
| US20140139344A1 (en) * | 2012-11-19 | 2014-05-22 | Snap-On Incorporated | Warning light devices and methods |
| KR102277667B1 (en) * | 2014-07-22 | 2021-07-15 | 삼성전자 주식회사 | Electronic apparatus, power supply and power controlling method thereof |
| CN104580929A (en) * | 2015-02-02 | 2015-04-29 | 南通莱奥电子科技有限公司 | Adaptive exposure type digital image processing system |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5187410A (en) * | 1991-04-18 | 1993-02-16 | Konica Corporation | Electronic flash device |
| US5780976A (en) * | 1996-02-20 | 1998-07-14 | Matsuo; Takumi | Constant-voltage automatic charging strobe circuit |
| US6064183A (en) * | 1996-08-05 | 2000-05-16 | Sanyo Electric Co., Ltd. | Device detecting the amount of charge remaining in a battery |
| US6091906A (en) * | 1998-05-26 | 2000-07-18 | Fuji Photo Film Co., Ltd. | Flash device |
| CN1072365C (en) * | 1995-01-06 | 2001-10-03 | 三星航空产业株式会社 | High-speed charge flash for camera |
| US6317566B1 (en) * | 1999-03-24 | 2001-11-13 | Fuji Photo Film Co., Ltd. | Electronic flash device for photographic camera |
| JP2002023230A (en) * | 2000-07-10 | 2002-01-23 | Fuji Photo Film Co Ltd | Camera |
| CN1089980C (en) * | 1996-09-03 | 2002-08-28 | 三洋电机株式会社 | Electronic camera and battery voltage controlling method employed therein |
-
2002
- 2002-11-06 JP JP2002322818A patent/JP2004157320A/en not_active Withdrawn
-
2003
- 2003-11-06 CN CNB2003101038101A patent/CN100360951C/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5187410A (en) * | 1991-04-18 | 1993-02-16 | Konica Corporation | Electronic flash device |
| CN1072365C (en) * | 1995-01-06 | 2001-10-03 | 三星航空产业株式会社 | High-speed charge flash for camera |
| US5780976A (en) * | 1996-02-20 | 1998-07-14 | Matsuo; Takumi | Constant-voltage automatic charging strobe circuit |
| US6064183A (en) * | 1996-08-05 | 2000-05-16 | Sanyo Electric Co., Ltd. | Device detecting the amount of charge remaining in a battery |
| CN1089980C (en) * | 1996-09-03 | 2002-08-28 | 三洋电机株式会社 | Electronic camera and battery voltage controlling method employed therein |
| US6091906A (en) * | 1998-05-26 | 2000-07-18 | Fuji Photo Film Co., Ltd. | Flash device |
| US6317566B1 (en) * | 1999-03-24 | 2001-11-13 | Fuji Photo Film Co., Ltd. | Electronic flash device for photographic camera |
| JP2002023230A (en) * | 2000-07-10 | 2002-01-23 | Fuji Photo Film Co Ltd | Camera |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004157320A (en) | 2004-06-03 |
| CN1554955A (en) | 2004-12-15 |
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