CN114096040A - Double-circuit independent control flash lamp drive structure - Google Patents
Double-circuit independent control flash lamp drive structure Download PDFInfo
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- CN114096040A CN114096040A CN202111365142.4A CN202111365142A CN114096040A CN 114096040 A CN114096040 A CN 114096040A CN 202111365142 A CN202111365142 A CN 202111365142A CN 114096040 A CN114096040 A CN 114096040A
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- 239000003990 capacitor Substances 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims 5
- 101710178035 Chorismate synthase 2 Proteins 0.000 description 1
- 101710152694 Cysteine synthase 2 Proteins 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/345—Current stabilisation; Maintaining constant current
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B15/00—Special procedures for taking photographs; Apparatus therefor
- G03B15/02—Illuminating scene
- G03B15/03—Combinations of cameras with lighting apparatus; Flash units
- G03B15/05—Combinations of cameras with electronic flash apparatus; Electronic flash units
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
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- General Physics & Mathematics (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
A dual-channel independent control flash lamp driving structure is characterized by comprising: the boost power supply module is used for converting an input voltage into an output voltage and outputting the output voltage from an output voltage end; the first constant current source branch comprises a first constant current source and a first light emitting diode which are connected between an output voltage end and a grounding end; the second constant current source branch comprises a second constant current source and a second light emitting diode which are connected between the output voltage end and the grounding end; a third constant current source branch including a third constant current source connected to the input voltage and a first feedback node; and the fourth constant current source branch comprises a fourth constant current source connected to the input voltage and a second feedback node. Due to the adoption of the chip architecture, the system adjusts the working mode of the system according to the current requirement of the light-emitting diode, so that the voltage loss is reduced to the minimum, and the working efficiency is greatly improved.
Description
Technical Field
The invention relates to the field of flash lamp driving circuits, in particular to a double-circuit independent control flash lamp driving structure.
Background
At present, mobile phones become very common in daily life of people, functions of the mobile phones become more and more abundant under the condition of extremely rapid development, and performances of the mobile phones become stronger and stronger. In order to meet the requirements of people on the stricter and stricter photographing functions, the design and investment of mobile phones in the aspect of photographing are also stronger and stronger, the pixels of mobile phone cameras are also higher and higher in recent years, and the flash function of the mobile phone cameras is also more and more important in order to obtain better images.
The typical flash lamp driving chip for the mobile phone is a structure of a boosting switching power supply and two paths of constant current sources. The structure has the problems of low efficiency, voltage loss and the like in a direct mode.
Disclosure of Invention
The invention aims to provide a double-path independent control flash lamp driving structure which has the problems of low optimization efficiency and voltage loss.
The technical problem solved by the invention can be realized by adopting the following technical scheme:
an innovative double-circuit independent control flash lamp drive structure, wherein includes:
the boost power supply module is used for converting an input voltage into an output voltage and outputting the output voltage from an output voltage end;
the first constant current source branch comprises a first constant current source and a first light emitting diode which are connected between an output voltage end and a grounding end;
the second constant current source branch comprises a second constant current source and a second light emitting diode which are connected between the output voltage end and the grounding end;
a third constant current source branch including a third constant current source connected to the input voltage and a first feedback node;
and the fourth constant current source branch comprises a fourth constant current source connected to the input voltage and a second feedback node.
Preferably, wherein,
includes a first control state, a second control state, and a third control state,
in the first control state:
the first constant current source and the second constant current source are closed;
the third constant current source is conducted and controls the first light-emitting diode;
the fourth constant current source is conducted and controls the second light emitting diode;
in the second control state:
the third constant current source and the fourth constant current source are closed;
the first constant current source is conducted to control the first light emitting diode;
the second constant current source is conducted to control the second light emitting diode;
in the third control state:
the fourth constant current source is turned off and the first constant current source is turned off;
the second constant current source is conducted to control the second light emitting diode;
and the third constant current source is conducted to control the first light-emitting diode.
Preferably, the buck-boost module comprises:
the energy storage inductor is connected between the input voltage and a reference node and used for boosting the circuit to store electric energy;
the NMOS tube is connected with the reference node and a grounding end and is used for conducting and stopping under the action of a first control signal;
the PMOS tube is connected with the reference node and the output voltage end and is used for conducting and stopping under the action of a second control signal;
and the output capacitor is connected with the output voltage end and the grounding end.
Preferably, the boost power module includes a logic controller for generating the first control signal and the second control signal.
Preferably, the source of the NMOS transistor is connected to the output terminal of the energy storage inductor, the drain of the NMOS transistor is grounded, and the gate of the NMOS transistor is connected to the logic controller;
preferably, the source electrode is connected to the output end of the energy storage inductor, the drain electrode of the PMOS transistor is connected to the output voltage end of the boost module, and the gate electrode of the PMOS transistor is connected to the logic controller.
Preferably, the first feedback node is led out from a circuit where the first constant current source and the first light emitting diode are connected, and the first feedback node is connected to the logic controller.
Preferably, the second feedback node is led out from the circuit connected with the second light emitting diode at the second constant current source, and the second feedback node is connected to the logic controller.
Preferably, in the first control state, the operating current is low, and the first light emitting diode and the second light emitting diode are controlled by the third constant current source and the fourth constant current source, respectively, which are not boosted.
Preferably, in the second control state, the operating current is high, and the first light emitting diode and the second light emitting diode are controlled by the first constant current source and the second constant current source which are boosted respectively.
Preferably, in the third control state, the boost circuit corresponding to the light emitting diode with high operating current is turned on to provide enough current required by the boost circuit, and the light emitting diode with low operating current is still provided with current by the original constant current source.
Has the beneficial effects that: due to the adoption of the chip architecture, the system adjusts the working mode of the system according to the current requirement of the light-emitting diode, so that the voltage loss is reduced to the minimum, and the working efficiency is greatly improved.
Drawings
FIG. 1 is a circuit diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
Referring to fig. 1, an innovative dual-path independent control flash lamp driving structure, wherein includes:
the boost power supply module is used for converting an input voltage into an output voltage and outputting the output voltage from an output voltage end VOUT;
a first constant current source branch including a first constant current source CS1 and a first light emitting diode LEDa connected between the output voltage terminal VOUT and the ground terminal GND;
a second constant current source branch including a second constant current source CS2 and a second light emitting diode LEDb connected between the output voltage terminal VOUT and the ground terminal GND;
a third constant current source branch including a third constant current source CS3 connected between the input voltage terminal VIN and a first feedback node LED 1;
the fourth constant current source branch comprises a fourth constant current source CS4 connected between the input voltage terminal VIN and a second feedback node LED 2.
In a specific embodiment of the present invention, wherein,
in a first control state: the first constant current source CS1 controls the current of the first light emitting diode LEDa under the action of the input voltage; the second constant current source CS2 controls the current of the second led LEDb under the action of the input voltage;
in a second control state: the third constant current source CS3 replaces the first constant current source CS1 to control the current of the first light emitting diode LEDa under the control of the input of the first feedback node; the fourth constant current source CS4 controls the current of the second led LEDb instead of the second constant current source CS2 under the second control input from the second feedback node;
in a third control state: the second constant current source CS2 and the third constant current source CS3 are turned on.
Specifically, when the currents required by the first light emitting diode LEDa and the second light emitting diode LEDb are small, the system is in the through mode, and the input voltage is directly applied to the third constant current source CS3 and the fourth constant current source CS4 to provide stable currents for the first light emitting diode LEDa and the second light emitting diode LEDb. The system is in the optimized direct-through mode for a long time, the voltage loss is reduced, and the working efficiency is improved.
Likewise, control signals via a logic controller, wherein
The first constant current source CS1 controls the current of the first light emitting diode LEDa by replacing the third constant current source CS3 under the control of the input of the first feedback node LED 1;
the second constant current source CS2 controls the current of the second LED LEDb under the control of the input of the second feedback node LED2 instead of the fourth constant current source CS 4.
When the current required by the first light emitting diode LEDa or the second light emitting diode LEDb is large, the voltage margin of the third constant current source CS3 or the fourth constant current source CS4 is insufficient, and the required current cannot be provided.
When the required current of the light emitting diode LEDa is smaller and the required current of the light emitting diode LEDb is larger, the second constant current source CS2 is turned on to control the light emitting diode LEDb, the fourth constant current source CS4 is turned off, the third constant current source CS3 is turned on to control the light emitting diode LEDa, the first constant current source is turned off,
the system adjusts the working mode of the system according to the current requirement of the light-emitting diode, so that the voltage loss is reduced to the minimum.
In a specific embodiment of the present invention, the buck-boost module includes:
the energy storage inductor L is connected between the input voltage end VIN and a reference node K;
an NMOS transistor controllably connected between a reference node K and a ground terminal GND under the action of a first control signal;
a PMOS transistor controllably connected between the reference node K and the output voltage terminal VOUT under the action of a second control signal;
and the output capacitor C is connected between the output voltage terminal VOUT and the grounding terminal GND.
In an embodiment of the present invention, the buck-boost module includes a logic controller 1 for generating a first control signal and a second control signal.
Specifically, the control logic of the logic controller is that the logic controller acquires parameters of the first feedback node LED1 and the second feedback node LED2, when the current is small, the first constant current source CS1 and the second constant current source CS2 are turned off, the third constant current source CS3 and the fourth constant current source CS4 are turned on, at this time, the current rises, the system operates in a direct mode, and when the voltage margin of the third constant current source CS3 or the fourth constant current source is insufficient, the boost circuit is started.
In a specific embodiment of the present invention, a source of the NMOS transistor is connected to an output terminal of the energy storage inductor, a drain of the NMOS transistor is grounded, and a gate of the NMOS transistor is connected to the logic controller.
In a specific embodiment of the present invention, a source of the PMOS transistor is connected to an output terminal of the energy storage inductor, a drain of the PMOS transistor is connected to an output voltage terminal of the boost module, and a gate of the PMOS transistor is connected to the logic controller.
In a specific embodiment of the present invention, among them, the first feedback node LED1, LED from the circuit where the first constant current source CS1 and the first light emitting diode LEDa are connected, is connected to the logic controller 1;
the second feedback node LED2 is LED out from the circuit connected between the second constant current source CS2 and the second light emitting diode LEDb, and is connected to the logic controller 1.
Specifically, the voltages of the first feedback node LED1 and the second feedback node LED2 are changed by the change of the required current levels of the first light emitting diode LEDa and the second light emitting diode LEDb, the voltage signals are outputted to the logic controller 1, and the logic controller 1 controls the system to enter the boost mode.
Specifically, the parameters of the feedback node are used to provide decision elements for the logic controller to select the current working mode, and the logic controller performs corresponding processing on the current working voltage of different constant current source branches to obtain a result as a condition for controlling whether the boost circuit is turned on, so as to achieve the purpose of controlling the states of the different constant current source branches.
In a specific embodiment of the present invention, in the first control state, the operating current is low, and the first light emitting diode and the second light emitting diode are respectively controlled by a third constant current source and a fourth constant current source which are not boosted.
Specifically, in the first operating state, the current requirements of LEDa and LEDb are smaller, the voltages of the LED1 and the LED2 are lower, and the output voltage VOUT is slightly lower than VIN.
In a specific embodiment of the present invention, in the second control state, the operating current is high, and the first light emitting diode and the second light emitting diode are controlled by the first constant current source and the second constant current source respectively.
Specifically, in the second operating state, the current demand of LEDa and LEDb is large, the voltage of the LED1 or the LED2 rises to be close to the output voltage VOUT, and at this time, the boost circuit starts to operate, and the output voltage VOUT rises to have a sufficient voltage margin between the first dc source CS1 and the second dc source CS 2.
In a specific embodiment of the present invention, in the third control state, the boost circuit corresponding to the light emitting diode with high operating current is turned on to provide the required current, and the light emitting diode with low operating current is still provided with current by the original constant current source.
Specifically, the third control state may determine the operation mode of the voltage boost circuit according to the operation current of different light emitting diodes, so as to reduce the voltage loss.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A double-circuit independent control flash lamp drive structure, its characterized in that includes:
the boost power supply module is used for converting an input voltage into an output voltage and outputting the output voltage from an output voltage end;
the first constant current source branch comprises a first constant current source and a first light emitting diode which are connected between an output voltage end and a grounding end;
the second constant current source branch comprises a second constant current source and a second light emitting diode which are connected between the output voltage end and the grounding end;
a third constant current source branch including a third constant current source connected to the input voltage and a first feedback node;
and the fourth constant current source branch comprises a fourth constant current source connected to the input voltage and a second feedback node.
2. The dual independent control flash drive structure of claim 1, comprising a first control state, a second control state, and a third control state,
in the first control state:
the first constant current source and the second constant current source are closed;
the third constant current source is conducted and controls the first light-emitting diode;
the fourth constant current source is conducted and controls the second light emitting diode;
in the second control state:
the third constant current source and the fourth constant current source are closed;
the first constant current source is conducted to control the first light emitting diode;
the second constant current source is conducted to control the second light emitting diode;
in the third control state:
the fourth constant current source is turned off and the first constant current source is turned off;
the second constant current source is conducted to control the second light emitting diode;
and the third constant current source is conducted to control the first light-emitting diode.
3. A dual-channel independent control flash drive architecture as recited in claim 1, wherein the boost power module comprises:
the energy storage inductor is connected between the input voltage and a reference node and used for boosting the circuit to store electric energy;
the NMOS tube is connected with the reference node and a grounding end and is used for conducting and stopping under the action of a first control signal;
the PMOS tube is connected with the reference node and the output voltage end and is used for conducting and stopping under the action of a second control signal;
and the output capacitor is connected with the output voltage end and the grounding end.
4. A dual channel independent control flash drive architecture as claimed in claim 3, wherein said boost power module includes a logic controller for generating said first control signal and said second control signal.
5. A dual independent control flash drive architecture according to claim 4,
the source electrode of the NMOS tube is connected with the output end of the energy storage inductor, the drain electrode of the NMOS tube is grounded, and the grid electrode of the NMOS tube is connected with the logic controller;
the source electrode of the PMOS tube is connected with the output end of the energy storage inductor, the drain electrode of the PMOS tube is connected with the output voltage end of the boosting module, and the grid electrode of the PMOS tube is connected with the logic controller.
6. A dual independent control flash drive structure as recited in claim 5, wherein said first feedback node is derived from a circuit connecting said first constant current source and said first led, said first feedback node being connected to said logic controller.
7. A dual independent control flash drive configuration according to claim 6 wherein said second feedback node is derived from said circuitry connected to said second led at a second constant current source, said second feedback node being connected to said logic controller.
8. A dual-channel independent control flash lamp driving structure as claimed in claim 7, wherein in the first control state, the operating current is low, and the first led and the second led are controlled by the third constant current source and the fourth constant current source without being boosted respectively.
9. A dual-channel independent control flash lamp driving structure as claimed in claim 8, wherein said second control state is a high operating current, and said first led and said second led are controlled by said first constant current source and said second constant current source respectively.
10. A dual-channel independent control flash lamp driving structure as claimed in claim 7, wherein in the third control state, the boost circuit corresponding to the led with high operating current is turned on to provide the required current, and the led with low operating current is still provided by the original constant current source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111365142.4A CN114096040A (en) | 2021-11-17 | 2021-11-17 | Double-circuit independent control flash lamp drive structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111365142.4A CN114096040A (en) | 2021-11-17 | 2021-11-17 | Double-circuit independent control flash lamp drive structure |
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| CN114096040A true CN114096040A (en) | 2022-02-25 |
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| CN202111365142.4A Pending CN114096040A (en) | 2021-11-17 | 2021-11-17 | Double-circuit independent control flash lamp drive structure |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004341329A (en) * | 2003-05-16 | 2004-12-02 | Atlus Co Ltd | Strobe light-emitting device, and automatic camera equipped therewith |
| WO2010131889A2 (en) * | 2009-05-11 | 2010-11-18 | 전자부품연구원 | Light-emitting diode driving circuit and driving method |
| CN106332410A (en) * | 2016-08-16 | 2017-01-11 | 深圳天珑无线科技有限公司 | Flash lamp driving circuit |
| CN108055737A (en) * | 2018-01-18 | 2018-05-18 | 上海灿瑞科技股份有限公司 | A kind of boost DC-DC constant current driver circuit for LED |
| CN108513403A (en) * | 2018-04-17 | 2018-09-07 | 南京矽力杰半导体技术有限公司 | The control circuit and control method of power inverter |
| US20200133320A1 (en) * | 2017-07-04 | 2020-04-30 | Rohm Co., Ltd. | Load drive device |
-
2021
- 2021-11-17 CN CN202111365142.4A patent/CN114096040A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004341329A (en) * | 2003-05-16 | 2004-12-02 | Atlus Co Ltd | Strobe light-emitting device, and automatic camera equipped therewith |
| WO2010131889A2 (en) * | 2009-05-11 | 2010-11-18 | 전자부품연구원 | Light-emitting diode driving circuit and driving method |
| CN106332410A (en) * | 2016-08-16 | 2017-01-11 | 深圳天珑无线科技有限公司 | Flash lamp driving circuit |
| US20200133320A1 (en) * | 2017-07-04 | 2020-04-30 | Rohm Co., Ltd. | Load drive device |
| CN108055737A (en) * | 2018-01-18 | 2018-05-18 | 上海灿瑞科技股份有限公司 | A kind of boost DC-DC constant current driver circuit for LED |
| CN108513403A (en) * | 2018-04-17 | 2018-09-07 | 南京矽力杰半导体技术有限公司 | The control circuit and control method of power inverter |
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