CN100370677C - Method for controlling flash lamp capacity charging and its apparatus and application thereof - Google Patents
Method for controlling flash lamp capacity charging and its apparatus and application thereof Download PDFInfo
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- CN100370677C CN100370677C CNB2004100969632A CN200410096963A CN100370677C CN 100370677 C CN100370677 C CN 100370677C CN B2004100969632 A CNB2004100969632 A CN B2004100969632A CN 200410096963 A CN200410096963 A CN 200410096963A CN 100370677 C CN100370677 C CN 100370677C
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Abstract
The present invention relates to a control method for charging a flash lamp capacitor and an apparatus and application thereof. The control method for charging a flash lamp capacitor comprises the following steps: voltage on the flash lamp capacitor is detected; when the voltage is below first reference voltage, a recharging signal is sent out and locked; when the voltage is above second reference voltage, the recharging signal is retracted and locked; when the recharging signal is sent out, the flash lamp capacitor is charged; a foot bit is provided to be connected to a resistance element determining the first reference voltage. The present invention provides a control method using adjustable recharging critical voltage to charge the flash lamp capacitor. A charging and recharging circuit is designed to enable an integrated circuit to have a foot bit which can be externally connected with the resistance element to determine charging critical voltage. In this way, a designer of a flash lamp and a camera can easily adjust desired charging critical voltage values, or current limiting values can be manually arranged by users or can be automatically arranged by a microprocessor.
Description
Technical field
The present invention relates to a kind of flash lamp circuit, particularly a kind ofly use the adjustable critical voltage that recharges to come method, the invention still further relates to a kind of battery charge controller and application thereof of capacitor of flash lamp capacitor of flash lamp charging control.
Background technology
Utilize the camera of photoflash lamp to generally comprise one to being attached to the charging circuit of the capacitor of flash lamp charging in the camera.This capacitor of flash lamp is with the mode storage power of electric charge.This energy can be used to produce flash of light by photoflash lamp after a while when taking pictures.
Generally speaking, at a camera that charging circuit is arranged, having a battery provides to a certain degree voltage to be used as the part of charging circuit to a voltage increases transformer (step up transformer).This transformer converts an about voltage of 3 volts (cell voltage) 300 volts of voltages of capacitor of flash lamp charging usefulness to, and capacitor of flash lamp provides the energy that is stored in itself to circuits for triggering again.This circuit part of functions provides boost voltage and uses about 4000 volts for photoflash lamp (bulb).This voltage causes the ionization of gas in the flashbulb.When photoflash lamp was triggered, capacitor of flash lamp produced very large electric current therein via ionizable flashbulb discharge.This electric current causes flash of light in flashbulb.
Fig. 1 represents the calcspar of the capacitor of flash lamp charging circuit that discloses in No. 6,518,733, the United States Patent (USP).A power supply transfer circuit 120 is as the usefulness that (preferably connects load) from input source 170 conversion electric powers to capacitor of flash lamp 144.Power supply transfer circuit 120 comprises that 130, one in a circuit (adapted ON-time circuit) that adapts to duration of work adapts to the not circuit of duration of work (adapted OFF-time circuit) 135, transformer 122, switching transistor 124, door bolt (Latch) 126 and output diode 142.Power supply transfer circuit 120 is to link together via output diode 142 and capacitor of flash lamp 144.The positive pole of output diode 142 is connected to the 2nd winding of transformer 122 outputs, and its negative electrode is connected to capacitor of flash lamp 144.Input source 170 is connected to the input of transformer 122 primary sides.The primary side output of transformer 122 is connected to the collector electrode of switching transistor 124.The emitter of switching transistor 124 is connected to the circuit 130 that adapts to duration of work.
The winding electric extreme direction of primary side and secondary side preferably arranges to allow corresponding winding polarity opposite.The polarity that polarity as shown in Figure 1 indicates 112 and 114 explanation primary sides and secondary side winding is opposite.This opposite pole placement is of great use for will use a kind of flyback line road topology (flyback circuit topology) time.
The circuit 130 that adapts to duration of work comprises one first switch resistance 131, the intersection point 134 that it is connected in the emitter of switching transistor 124 and constitutes duration of work.Duration of work circuit 130 also comprises a duration of work comparator 132.Duration of work comparator 132 is connected with duration of work intersection point 134 and duration of work reference voltage VREF1 133 to receive voltage signal.
Adapt to not that the circuit 135 of duration of work comprises a second switch resistance 136, in order to second winding that is connected to transformer 122 and the forward of duration of work comparator 137 (non-inverting) end not.Duration of work comparator 137 does not receive a not duration of work reference voltage signal-VREF2138 simultaneously yet.Why to be expressed as negative value be not because with making comparisons through the reverse voltage of second switch resistance 136 to the reference voltage-VREF2138 of duration of work.
Adapt to duration of work circuit 130 and adapt to not that duration of work circuit 135 provides signals that use to door bolt 126 respectively.For instance, door bolt 126 can be a setting/replacement (set/reset) door bolt.Particularly export, and setting section is connected with under the situation of accepting its output with duration of work circuit 135 not when door bolt 126 replacement part is connected with duration of work circuit 130 to accept it.Receive setting and reset signal simultaneously if fasten 126 with a bolt or latch, the input of reset signal will acquire a priority.Door bolt 126 according to duration of work circuit 130 and not the output that provided of duration of work circuit 135 provide a breech lock to export to the base stage of switching transistor 124.The output of this breech lock will change that its attitude position is opened or off switch transistor 124 produces direct current and changes the needed exchange of direct current (switching) and move.
When the recharging action and finish immediately after flash of light is sent an of photoflash lamp, another recharges the action meeting and takes place when the voltage of capacitor of flash lamp 144 is lower than reference voltage VREF2138 because of the capacitor leakage current decay.This can keep capacitor of flash lamp at enough charge volumes to next time use.When photoflash lamp not too is required,, can compare important that photoflash lamp charges at any time and to the consideration of power consumption for example in the open air of a bright spring day.According to this situation, reference voltage VREF2138 need be set as lower value and reduce the frequency that recharges.Opposite under photoflash lamp situation relatively more commonly used, for example during night, reference voltage VREF2138 need be set as than higher value and prevent undercharge.
The aforesaid circuit of commonly seeing, circuit except transformer and capacitor of flash lamp and element can exist in the single integrated circuit (IC).Reference voltage VREF1133 and VREF2138 have just determined when production of integrated circuits, so the time planning that recharges does not have elasticity.This is disadvantageous to considering of power consumption.
Summary of the invention
In view of this, the invention provides a kind of charge control method for capacitor of flash lamp and device and application thereof.What The present invention be more particularly directed to is a kind of by using an adjustable critical voltage that recharges that capacitor of flash lamp is made the method that charging is controlled.
The invention provides a method controls the charging of capacitor of flash lamp.This method comprises: detect a voltage that is illustrated on the capacitor of flash lamp; Utilization records the state that this voltage is lower than one first reference voltage and sends and fasten a re-charging signal; Utilization records this voltage and exceeds the state cancellation of one second reference voltage and fasten re-charging signal; When re-charging signal is sent, capacitor of flash lamp is charged; Provide a pin position to determine the resistive element of first reference voltage, wherein: recording when this that voltage is lower than and sending when being higher than aforementioned first reference voltage and cancel one first output signal respectively with connection; Recording when this that voltage is higher than and sending when being lower than aforementioned second reference voltage and cancel one second output signal respectively; When aforementioned first output signal is sent, send re-charging signal, when aforementioned second output signal is sent till; And when this second output signal is sent the cancellation re-charging signal, when this first output signal is sent till.
The present invention further provides a capacitor of flash lamp battery charge controller that is connected with a microprocessor.This capacitor of flash lamp battery charge controller comprises: a transformer, and it receives a primary side input voltage and produces a secondary side output voltage on capacitor of flash lamp when a re-charging signal produces; One recharges control device, detects a voltage that is illustrated on the capacitor of flash lamp; Utilization records the state that voltage is lower than one first reference voltage and sends and fasten re-charging signal; Utilization records voltage and exceeds the state cancellation of one second reference voltage and fasten re-charging signal; Wherein the value of first reference voltage is determined by aforementioned microprocessor, and wherein, the described control device that recharges comprises: one first comparator, respectively when recording that voltage is lower than and sending when being higher than aforementioned first reference voltage and cancel one first output signal; One second comparator is respectively when recording that voltage is higher than and sending when being lower than aforementioned second reference voltage and cancel one second output signal; And a door bolt, when this first output signal is sent, send re-charging signal till when this second output signal is sent, and in sending when this second output signal, cancel re-charging signal till when this first output signal is sent.
The battery charge controller of capacitor of flash lamp of the present invention, described first comparator comprises:
A voltage divider is formed by one first resistance and one second resistance serial connection, and receives aforementioned primary side input voltage and produce aforementioned first reference voltage by its dividing potential drop; And
A comparator, its positive input terminal receive first reference voltage and its negative input end receives the aforementioned voltage that records, and exports this first output signal by output;
Wherein, first resistance and second resistance one of them be adjustable.
The battery charge controller of capacitor of flash lamp of the present invention, described second comparator comprises:
A voltage divider is formed by one first resistance and one second resistance serial connection, and receives aforementioned primary side input voltage and produce aforementioned second reference voltage by its dividing potential drop; And
A comparator, its positive input terminal receive second reference voltage and its negative input end receives the aforementioned voltage that records, and exports second output signal by output.
The battery charge controller of capacitor of flash lamp of the present invention, described door bolt comprises:
First and second inverter, wherein the input of this first inverter and output are received the output and the input of this second inverter respectively;
One the 3rd inverter, its input are received the output and the output of this second inverter and are exported aforementioned re-charging signal;
One first switch, it is received between the input and ground voltage of this first inverter, and connects when aforementioned first output signal is sent and cancelled respectively and cut off; And
A second switch, it is received between the input and ground voltage of this second inverter, and connects when aforementioned second output signal is sent and cancelled respectively and cut off.
The battery charge controller of capacitor of flash lamp of the present invention, described first, second and the 3rd inverter comprise respectively:
A transistor, its collector electrode are used as output and its emitter is received ground voltage;
A current source is received this transistorized collector electrode; And
A resistance, one end are used as input and its other end is received this transistorized base stage.
The battery charge controller of capacitor of flash lamp of the present invention, described first and second switch be respectively a transistor.
The battery charge controller of capacitor of flash lamp of the present invention, the charging device of described capacitor of flash lamp further comprises: voltage divider and capacitor of flash lamp are connected in parallel, this voltage divider is formed by first and second resistance serial connection, and will come from the aforementioned voltage that records of voltage difference dividing potential drop generation at capacitor of flash lamp two ends.
The present invention also provides the concrete application of the charge-current limit of a kind of integrated circuit as capacitor of flash lamp.This integrated circuit comprises: the first, second, third and the 4th pin position, receive voltage that a ground voltage, primary side input voltage, one detect from capacitor of flash lamp respectively and by one first reference voltage that resistive element produced; One recharges control circuit, record voltage according to this and produce a re-charging signal, comprise: one first alternative route, record that voltage is lower than and send when being higher than aforementioned first reference voltage and cancel one first output signal when this respectively, comprise: one first comparator, its positive input and negative input receive the 4th and the tripod position respectively; And a resistance is connected between the second and the 4th pin position; One second alternative route, voltage is higher than and send when being lower than one second reference voltage and cancel one second output signal when this records respectively, and comprise: a voltage divider is received between first and second pin position, in order to produce aforementioned second reference voltage; And one second its positive input of comparator reaches the output that tripod position and aforementioned voltage divider are received in negative input respectively; A door bolt, it is when this first output signal is sent, send this re-charging signal till when this second output signal is sent, and in sending when this second output signal, this re-charging signal of cancellation till when this first output signal is sent, comprise: first and second inverter, wherein the input of this first inverter and output are received the output and the input of this second inverter respectively; Output and its output that one the 3rd inverter, its input are received this second inverter produce re-charging signal; One first switch is received between the input and the first pin position of this first inverter, and connects when aforementioned first output signal is sent and cancelled respectively and cut off; And a second switch receives between the input and the first pin position of this second inverter, and connects when aforementioned second output signal is sent and cancelled respectively and cut off.
Of the present invention capacitor of flash lamp is recharged the integrated circuit of control, described first, second and the 3rd inverter comprise respectively:
A transistor, its collector electrode are used as output and its emitter is received ground voltage;
A current source of receiving the transistor collector plate; And
A resistance, one end are used as input and its other end is received this transistorized base stage.
Of the present invention capacitor of flash lamp is recharged the integrated circuit of control, described first and second switch be respectively a transistor.
Of the present invention capacitor of flash lamp is recharged the integrated circuit of control, the described integrated circuit that capacitor of flash lamp is recharged control further comprises:
One the 5th pin position is connected to the primary side of transformer; And
A current switch of being controlled by this re-charging signal of aforementioned the 3rd inverter output, it is connected between the 5th and first pin position.
Effect of the present invention is: use an adjustable critical voltage that recharges that the charging of capacitor of flash lamp is controlled, this charging recharging circuit is designed to allow integrated circuit have a pin position can an external resistive element to decide the critical voltage of charging.Thus, the designer of photoflash lamp and camera can be easily sets up the charging critical voltage value of wanting, in addition can be by the user manual or microprocessor automatically current limit value is set.
Description of drawings
Fig. 1 represents the capacitor of flash lamp charging circuit calcspar that discloses in No. 6,518,733, the United States Patent (USP);
Fig. 2 A and 2B are the line block diagram of the capacitor of flash lamp charging device contained of a present invention;
Fig. 3 is the signal timing diagram that is used in the electric capacity charging device of Fig. 2 B;
The flow chart of the capacitor of flash lamp charging method that Fig. 4 is contained for a kind of the present invention.
Embodiment
The present invention will be relatively easy to overall understanding by the diagram that describes in detail, and it is only as the usefulness of diagram but not the present invention is limited to the diagram scope.
Fig. 2 A is the capacitor of flash lamp charging device circuit block diagram that wherein a kind of implementation method produces according to the present invention.This photoflash lamp also capacity charge device links the generation effect with a microprocessor (legend does not show) in camera, it comprises: capacitor C 1, voltage increases transformer 21, integrated circuit 22, ultrafast (ultra-fast) diode D1, capacitor of flash lamp 23, a voltage divider 24 and a variable resistor 25.One termination of voltage increases transformer 21 usefulness first side winding is received the primary side input voltage from input source 20, and the other end of first side winding is received the SWITCH pin position of integrated circuit 22; Therefore only when integrated circuit 22 is held this pin position of SWITCH, can produce an input current with receiving and trigger a charging current of giving capacitor of flash lamp 23.This pin position of SWITCH only can be held when sending at 22 1 internal action signals of integrated circuit L-set (not expression will be described after a while among Fig. 2 A) with receiving.
Shown in Fig. 2 B, integrated circuit 22 comprises that one first alternative route comprises: one first comparator 221, and a resistance R 1; One second alternative route comprises: one second comparator 222 and a voltage divider 223; A door bolt 224; And current switch 225.
As is well known, inverter 2241 to 2244 can comprise: a transistor M 1, its collector electrode is used as output and emitter is received collector electrode and resistance R 5 that pin position GND, a current source CS receive transistor M1, and the one end is used as input and its other end is received the base stage of transistor M 1.Any one switch 2245 and 2246 can be a transistor M2.The action of integrated circuit 22 will be done explanation with reference to Fig. 3 following.
In Fig. 3, please note voltage VFB from low level (near 0) toward rising to VBG, during A between the B, this takes place after a flash of light creates immediately.Capacitor of flash lamp 23 during during C by full charging.Then during during D, voltage VFB descends because of capacitor leakage current.When during E, voltage VFB drops to when lower than voltage VHYST, capacitor of flash lamp 23 can by in charging and VFB during begin to raise among the E.Because the pin position VHYST of integrated circuit 22 connects with outside resistive element 25, the system designer of photoflash lamp and camera just can be adapted to reference voltage VHYST a value of wanting very easily.Outer meeting resistance 25 can be a variable resistor even, and its resistance value can see through the signal ADJ that comes from the microprocessor of camera and adjust, shown in Fig. 2 A.Therefore, when photoflash lamp not too is required, reference voltage VHYST can be by the user manual or microprocessor be set to lower value automatically and reduce the frequency that recharges, and reduce power consumption significantly.
Fig. 4 is the flow chart that the capacitor of flash lamp charging method is contained in a present invention.
In step S40, a capacitor of flash lamp glistens via Ionized flashbulb discharge generation.
In step S41, detect the voltage on capacitor of flash lamp.
In step S42, be lower than one first reference voltage owing to record voltage, send one first output signal.For reacting sending of first output voltage, be issued and begin the capacitor of flash lamp that charges at charging signals, and record voltage thereby rising.
In step S43, be higher than first reference voltage when recording voltage, first output signal is cancelled.Because re-charging signal is issued and fastened, electric capacity continues charging and records voltage to continue to rise.
In step S44, one second output signal is higher than one second reference voltage and sends because record voltage.For reacting sending of second output voltage, re-charging signal is cancelled the charging that stops capacitor of flash lamp.
In step S45, record voltage because capacitor leakage current begins to reduce.Second output signal is fallen and is cancelled when being lower than second reference voltage recording voltage; So continue descend record voltage because re-charging signal has been sent and fastened this moment.
In step S46, first output signal is issued again, is lower than first reference voltage again because record voltage.Because sending of reaction first output signal, re-charging signal is also sent again, begins charging so recharge electric capacity.
In step S47, a pin position is provided to receive a resistive element.First reference voltage is adjustable and is determined by the resistive element that is connect.
Generally speaking, the invention provides a kind of method and element and use the adjustable method of critical voltage that recharges the charging of capacitor of flash lamp do.This charging recharging circuit is designed to allow integrated circuit have a pin position can an external resistive element to decide the critical voltage of charging.Thus, the designer of photoflash lamp and camera can be easily sets up the charging critical voltage value of wanting, in addition can be by the user manual or microprocessor automatically current limit value is set.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; anyly have the knack of this skill person; without departing from the spirit and scope of the present invention; when can doing to change and retouching, so protection scope of the present invention is as the criterion when the scope that claims were defined with the application.
Being simply described as follows of symbol in the accompanying drawing:
112,114: winding polarity indicates
120: the power supply transfer circuit
122: the voltage increases transformer
124: transistor
126: door bolt
130: the circuit that adapts to duration of work
131: the first switch resistances
132: the duration of work comparator
133: the duration of work reference voltage
134: the duration of work intersection point
135: adapt to the not circuit of duration of work
136: second switch resistance
137: duration of work comparator not
138: duration of work reference voltage not
142: switching transistor
144: capacitor of flash lamp
20: input source
C1: electric capacity
D1: ultrafast diode
21: power supply increases transformer
22: integrated circuit
23: capacitor of flash lamp
24: the dividing potential drop circuit
25: variable resistor element
VIN, VFB, ADJ, SWITCH, VHYST, DONE: signal name
GND: ground voltage
221,222: comparator
223: voltage divider
224: door bolt
225: switch
2241 to 2244: inverter
2245,2246: switch
M1, M2: transistor
R1 to R5: resistance
L-set, OUT1, OUT2: signal name
VBG: reference voltage level
Claims (12)
1. charge control method for capacitor of flash lamp is characterized in that the method that control is done in described charging to capacitor of flash lamp comprises:
Detect a voltage that comes from capacitor of flash lamp;
When recording, this sends and fastenes a re-charging signal when voltage is lower than one first reference voltage;
Cancellation and fasten aforementioned re-charging signal when this records voltage and exceeds one second reference voltage;
When this re-charging signal is sent, capacitor of flash lamp is charged; And
The resistive element of a pin position with aforementioned first reference voltage of connection decision is provided,
Wherein, recording when this that voltage is lower than and sending when being higher than aforementioned first reference voltage and cancel one first output signal respectively;
Recording when this that voltage is higher than and sending when being lower than aforementioned second reference voltage and cancel one second output signal respectively;
When aforementioned first output signal is sent, send re-charging signal, when aforementioned second output signal is sent till; And
When this second output signal is sent the cancellation re-charging signal, when this first output signal is sent till.
2. a capacitor of flash lamp battery charge controller uses with a microprocessor, it is characterized in that described capacitor of flash lamp battery charge controller comprises:
A transformer receives a primary side input voltage and produces a secondary side output voltage on capacitor of flash lamp when a re-charging signal produces; And
One recharges control device, it detects a voltage that comes from capacitor of flash lamp, when recording, this sends and fastenes aforementioned re-charging signal when voltage is lower than one first reference voltage, and cancellation and fasten this re-charging signal when this records voltage and exceeds one second reference voltage;
Wherein the value of this first reference voltage is determined by aforementioned microprocessor,
Wherein, the described control device that recharges comprises:
One first comparator is respectively when recording that voltage is lower than and sending when being higher than aforementioned first reference voltage and cancel one first output signal;
One second comparator is respectively when recording that voltage is higher than and sending when being lower than aforementioned second reference voltage and cancel one second output signal; And
A door bolt when this first output signal is sent, sends re-charging signal till when this second output signal is sent, and in sending when this second output signal, cancels re-charging signal till when this first output signal is sent.
3. as capacitor of flash lamp battery charge controller as described in the claim 2, it is characterized in that described first comparator comprises:
A voltage divider is formed by one first resistance and one second resistance serial connection, and receives aforementioned primary side input voltage and produce aforementioned first reference voltage by its dividing potential drop; And
A comparator, its positive input terminal receive first reference voltage and its negative input end receives the aforementioned voltage that records, and exports this first output signal by output;
Wherein, first resistance and second resistance one of them be adjustable.
4. as capacitor of flash lamp battery charge controller as described in the claim 2, it is characterized in that described second comparator comprises:
A voltage divider is formed by one first resistance and one second resistance serial connection, and receives aforementioned primary side input voltage and produce aforementioned second reference voltage by its dividing potential drop; And
A comparator, its negative input end receive second reference voltage and its positive input terminal receives the aforementioned voltage that records, and exports second output signal by output.
5. as capacitor of flash lamp battery charge controller as described in the claim 2, it is characterized in that described door bolt comprises:
First and second inverter, wherein the input of this first inverter and output are received the output and the input of this second inverter respectively;
One the 3rd inverter, its input are received the output and the output of this second inverter and are exported aforementioned re-charging signal;
One first switch, it is received between the input and ground voltage of this first inverter, and connects when aforementioned first output signal is sent and cancelled respectively and cut off; And
A second switch, it is received between the input and ground voltage of this second inverter, and connects when aforementioned second output signal is sent and cancelled respectively and cut off.
6. as capacitor of flash lamp battery charge controller as described in the claim 5, it is characterized in that described first, second and the 3rd inverter comprise respectively:
A transistor, its collector electrode are used as output and its emitter is received ground voltage;
A current source is received this transistorized collector electrode; And
A resistance, one end are used as input and its other end is received this transistorized base stage.
7. as capacitor of flash lamp battery charge controller as described in the claim 5, it is characterized in that described first and second switch be respectively a transistor.
8. as capacitor of flash lamp battery charge controller as described in the claim 2, the charging device that it is characterized in that described capacitor of flash lamp further comprises: voltage divider and capacitor of flash lamp are connected in parallel, this voltage divider is formed by first and second resistance serial connection, and will come from the aforementioned voltage that records of voltage difference dividing potential drop generation at capacitor of flash lamp two ends.
9. one kind recharges the integrated circuit of control to capacitor of flash lamp, it is characterized in that the described integrated circuit that capacitor of flash lamp is recharged control comprises:
The first, second, third and the 4th pin position is received voltage that a ground voltage, primary side input voltage, one detect from capacitor of flash lamp respectively and by one first reference voltage that resistive element produced;
One recharges control circuit, records voltage according to this and produces a re-charging signal, comprises:
One first alternative route is lower than and is higher than aforementioned when this records voltage respectively
Send during first reference voltage and cancel one first output signal, comprise:
One first comparator, its positive input and negative input receive the 4th respectively
And tripod position; And
A resistance is connected between the second and the 4th pin position;
One second alternative route is higher than and is lower than one when this records voltage respectively
Send during second reference voltage and cancel one second output signal, comprise:
A voltage divider is received between first and second pin position, in order to produce aforementioned second reference voltage; And
The output that tripod position and aforementioned voltage divider are received in one second its positive input of comparator and negative input respectively;
A door bolt, it is when this first output signal is sent, and sends this re-charging signal till when this second output signal is sent, and in sending when this second output signal, this re-charging signal of cancellation till when this first output signal is sent comprises:
First and second inverter, wherein the input of this first inverter and output are received the output and the input of this second inverter respectively;
Output and its output that one the 3rd inverter, its input are received this second inverter produce re-charging signal;
One first switch is received between the input and the first pin position of this first inverter, and connects when aforementioned first output signal is sent and cancelled respectively and cut off; And
A second switch is received between the input and the first pin position of this second inverter, and connects when aforementioned second output signal is sent and cancelled respectively and cut off.
10. as capacitor of flash lamp being recharged as described in the claim 9 integrated circuit of control, it is characterized in that described first, second and the 3rd inverter comprise respectively:
A transistor, its collector electrode are used as output and its emitter is received ground voltage;
A current source of receiving transistor collector; And
A resistance, one end are used as input and its other end is received this transistorized base stage.
11. as capacitor of flash lamp being recharged as described in the claim 9 integrated circuit of control, it is characterized in that described first and second switch be respectively a transistor.
12., it is characterized in that the described integrated circuit that capacitor of flash lamp is recharged control further comprises as capacitor of flash lamp being recharged as described in the claim 9 integrated circuit of control:
One the 5th pin position is connected to the primary side of transformer; And
A current switch of being controlled by this re-charging signal of aforementioned the 3rd inverter output, it is connected between the 5th and first pin position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100969632A CN100370677C (en) | 2004-12-08 | 2004-12-08 | Method for controlling flash lamp capacity charging and its apparatus and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100969632A CN100370677C (en) | 2004-12-08 | 2004-12-08 | Method for controlling flash lamp capacity charging and its apparatus and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1787328A CN1787328A (en) | 2006-06-14 |
| CN100370677C true CN100370677C (en) | 2008-02-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100969632A Expired - Fee Related CN100370677C (en) | 2004-12-08 | 2004-12-08 | Method for controlling flash lamp capacity charging and its apparatus and application thereof |
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| Country | Link |
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| CN (1) | CN100370677C (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6289180B1 (en) * | 1997-12-08 | 2001-09-11 | Intel Corporation | Photoflash charging circuit with current and voltage monitor |
| US6518733B1 (en) * | 2001-08-03 | 2003-02-11 | Linear Technology Corporation | Circuits and techniques for capacitor charging circuits |
| CN1514526A (en) * | 2002-12-31 | 2004-07-21 | 圆创科技股份有限公司 | Charging IC circuit of camera flash lapm |
-
2004
- 2004-12-08 CN CNB2004100969632A patent/CN100370677C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6289180B1 (en) * | 1997-12-08 | 2001-09-11 | Intel Corporation | Photoflash charging circuit with current and voltage monitor |
| US6518733B1 (en) * | 2001-08-03 | 2003-02-11 | Linear Technology Corporation | Circuits and techniques for capacitor charging circuits |
| CN1514526A (en) * | 2002-12-31 | 2004-07-21 | 圆创科技股份有限公司 | Charging IC circuit of camera flash lapm |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1787328A (en) | 2006-06-14 |
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