WO2020057135A1 - Circuit de commande de lampe torche et terminal mobile - Google Patents

Circuit de commande de lampe torche et terminal mobile Download PDF

Info

Publication number
WO2020057135A1
WO2020057135A1 PCT/CN2019/085295 CN2019085295W WO2020057135A1 WO 2020057135 A1 WO2020057135 A1 WO 2020057135A1 CN 2019085295 W CN2019085295 W CN 2019085295W WO 2020057135 A1 WO2020057135 A1 WO 2020057135A1
Authority
WO
WIPO (PCT)
Prior art keywords
resistor
transistor
control circuit
triode
flash
Prior art date
Application number
PCT/CN2019/085295
Other languages
English (en)
Chinese (zh)
Inventor
徐家林
Original Assignee
深圳市泰衡诺科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳市泰衡诺科技有限公司 filed Critical 深圳市泰衡诺科技有限公司
Publication of WO2020057135A1 publication Critical patent/WO2020057135A1/fr

Links

Images

Classifications

    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source

Definitions

  • the present invention relates to the field of control technology, and in particular, to a flash control circuit and a mobile terminal.
  • control circuits for the flash in mobile terminals there are mainly two types of control circuits for the flash in mobile terminals: one is controlled by an integrated chip (IC); the other is a discrete bipolar junction transistor (BJT) or MOS tube Take control.
  • IC integrated chip
  • BJT discrete bipolar junction transistor
  • MOS tube Take control.
  • an integrated chip used for control
  • the current flowing through the flash is small and the brightness of the flash is weak.
  • the current flowing through the flash can be made larger, and the brightness of the flash can be made higher.
  • FIG. 1 is a schematic diagram of a circuit structure for controlling a flash lamp by using discrete devices in the prior art.
  • the voltage applied to the base of the BJT11 is adjusted by the control chip 12 so that the BJT11 is turned on and the flash 10 is blinked.
  • the control method in Figure 1 is simple, during the flashing of the flash, the BJT11 also plays a role of current amplification, that is, when the current that needs to flow through the flash 10 is large (such as 2A), it flows through the base of BJT11 The current will also be very large (for example, when the amplification gain of the BJT11 is 100, the current flowing through the base will be as high as 20 mA). Excessive current will cause BJT11 to heat up very seriously, and even cause BJT11 to burn out.
  • the invention provides a flash control circuit and a mobile terminal, which are used to solve the problem that the flash control circuit has serious heat generation in the prior art.
  • the present invention provides a flash lamp control circuit including a flash lamp and a current amplification structure;
  • the current amplification structure includes a first transistor and a second transistor, and a current output of the first transistor The terminal is connected to the current input terminal of the second transistor; the current amplified by the current amplification structure flows into the flash lamp.
  • the current amplification structure can amplify the current input to the flash lamp by at least 1000 times.
  • the first transistor and the second transistor are both NPN type transistors; the emitter of the first transistor is connected to the base of the second transistor; and the flash is simultaneously The collector of the first triode is connected to the collector of the second triode.
  • the first transistor and the second transistor are both PNP type transistors; the base of the first transistor is connected to the emitter of the second transistor; and the flash is simultaneously The collector of the first triode is connected to the collector of the second triode.
  • the first triode and the second triode have the same electrical performance.
  • it further includes a first resistor, a second resistor, and a third resistor; one end of the first resistor is connected to the power output terminal, and the other end of the first resistor is simultaneously connected to the base of the first transistor and the second resistor. One end; the other end of the second resistor is grounded; one end of the third resistor is connected to the emitter of the second transistor, and the other end is grounded.
  • the voltages applied to the first resistor, the second resistor, the third resistor, and the flash lamp are all 2.4V-2.8V.
  • the resistance of the first resistor is equal to the resistance of the third resistor, and the resistance of the second resistor is 8-10 times the resistance of the first resistor.
  • the resistance of the first resistor and the third resistor are both 1K ⁇ , and the resistance of the second resistor is 10K ⁇ .
  • the present invention further provides a mobile terminal including the flash control circuit according to any one of the above.
  • the strobe control circuit and mobile terminal provided by the present invention adopt a structure in which two triodes are connected in series as a current amplification structure to amplify the current flowing into the strobe, and the current amplification factor of the current amplification structure is the current amplification factor of the two triodes.
  • the product can reduce the current flowing through the base of each transistor while ensuring that a large current flows in the flash and maintaining high brightness, which solves the serious problem of triode heating and reduces the heat generation in the flash control circuit.
  • FIG. 1 is a schematic diagram of a circuit structure for controlling a flash lamp by using a discrete device in the prior art
  • FIG. 2 is a schematic structural diagram of a flash control circuit in a specific embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of a flash control circuit in a specific embodiment of the present invention.
  • the strobe control circuit provided in this embodiment includes a strobe and a current amplification structure; the current amplification structure includes a first transistor T1 and a second transistor T2, and the first transistor The current output terminal of T1 is connected to the current input terminal of the second transistor T2; the current amplified by the current amplification structure flows into the flash lamp.
  • the position of the second ammeter A2 in FIG. 2 is the installation position of the flash.
  • the second ammeter A2 is used to detect the current flowing through the flash.
  • the second ammeter A2 in FIG. 2 is replaced with the flashlight to form the flashlight control circuit.
  • the current amplification structure is used to amplify the current flowing into the flash lamp.
  • the current amplification structure is configured by using a first transistor T1 and a second transistor T2 connected in series, and then the total current amplification factor of the current amplification structure is the current of the first transistor T1.
  • the first ammeter A1 in FIG. 2 is used to detect the current flowing through the base of the first transistor T1 to test the effect of the flash control circuit provided by this embodiment.
  • the first ammeter A1 in the flash control circuit there is no need to set the first ammeter A1 in the flash control circuit. For example, if the current amplification factors of the first transistor T1 and the second transistor T2 are both 100 times, the total current amplification factor of the current amplification structure is 10,000 times;
  • the second ammeter A2 that is, the current flowing into the flashlight
  • the current detected by the first ammeter A1 that is, the current flowing into the base of the first transistor T1
  • this specific implementation greatly reduces the base current.
  • the current amplification factor of the first triode T1 and the second triode T2 may be the same or different. Those skilled in the art may select the first triode T1 according to actual needs. And the second transistor T2 to construct the current amplification structure with a suitable current amplification factor.
  • the current amplification structure can amplify the current input to the flash lamp by at least 1000 times. More preferably, the current amplification structure can amplify the current input to the flash lamp by at least 10,000 times.
  • the first triode T1 and the second triode T2 are both NPN type triodes; the emitter of the first triode T1 is connected to the second triode The base of the tube T2; the flash is connected to the collector of the first transistor T1 and the collector of the second transistor T2 at the same time.
  • the electrical performance of the first transistor T1 and the second transistor T2 may be the same or different. In order to simplify the structure of the flash lamp control circuit and facilitate accurate control of the current flowing through the flash lamp, it is more preferable, and preferably, that the first transistor T1 and the second transistor T2 have the same electrical performance.
  • the same electrical performance means that the first triode T1 and the second triode T2 have at least the same current amplification factor.
  • the first transistor and the second transistor are both PNP type transistors; the base of the first transistor is connected to the emitter of the second transistor; The flash is connected to the collector of the first triode and the collector of the second triode simultaneously.
  • the flash control circuit further includes a first resistor R1, a second resistor R2, and a third resistor R3; one end of the first resistor R1 is connected to the power output terminal, and the other end is simultaneously connected to the first transistor T1.
  • the base of the second resistor R2 is connected to one end of the second resistor R2; the other end of the second resistor R2 is grounded; one end of the third resistor R3 is connected to the emitter of the second transistor T2, and the other end is grounded.
  • the voltages applied to the first resistor R1, the second resistor R2, the third resistor R3, and the flash lamp are all 2.4V-2.8V.
  • the first triode T1 and the second triode T2 are NPN type triodes having the same electrical performance.
  • the voltage drop between the base and the emitter of the first transistor T1 is 1.2V-1.4V
  • the base and the emitter of the second transistor T2 are The voltage drop between them is also 1.2V-1.4V.
  • the current amplification structure can effectively amplify the current input to the flash.
  • a bias circuit for controlling the current amplifying structure needs to be provided to realize the bias voltage division of the first transistor T1 and the second transistor T2.
  • the bias voltage of the current amplification structure when the voltage is positive, is the voltage drop between the base and the emitter of the first transistor T1 and the voltage drop between the second transistor T2 and the second transistor T2.
  • the sum of the voltage drop between the base and the emitter is 2.4V-2.8V. Therefore, the voltages applied to the first resistor R1, the second resistor R2, the third resistor R3, and the flash lamp are both 2.4V-2.8V to further precisely control the current amplification structure. Current amplification effect.
  • the first transistor T1 and the second transistor T2 are PNP type transistors with the same electrical performance.
  • the bias voltage of the current amplification structure is the first transistor.
  • the voltage applied to the first resistor R1, the second resistor R2, the third resistor R3, and the flash lamp should also be 2.4V-2.8V to further precisely control the current.
  • the current amplification effect of the amplification structure is 2.4V-2.8V.
  • the first resistor R1, the second resistor R2, and the third resistor R3 may all be fixed-value resistors or variable resistors, and those skilled in the art may choose according to actual needs.
  • the resistance of the first resistor R1 is equal to the resistance of the third resistor R3, and the resistance of the second resistor R2 is the first resistor 8-10 times the resistance of R1. More preferably, the resistance of the first resistor R1 and the third resistor R3 are both 1K ⁇ , and the resistance of the second resistor R2 is 10K ⁇ .
  • this embodiment also provides a mobile terminal including the flash control circuit according to any one of the above.
  • the mobile terminal may be, but is not limited to, a mobile phone, a notebook computer, and a tablet computer.
  • the strobe control circuit and mobile terminal use the structure of two triodes connected in series as a current amplification structure to amplify the current flowing into the strobe, and the current amplification factor of the current amplification structure is two triode current amplifications.
  • the product of multiples so as to ensure a large current flowing in the flash and maintain high brightness, reduce the current flowing through the base of each transistor, solve the serious problem of triode heating, and reduce the amount of heat in the flash control circuit .

Landscapes

  • Studio Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

La présente invention se rapporte au domaine technique de la commande, et en particulier à un circuit de commande de lampe torche et à un terminal mobile. Le circuit de commande de lampe torche comprend une lampe torche et une structure d'amplification de courant. La structure d'amplification de courant comprend une première triode et une seconde triode. Une extrémité de sortie de courant de la première triode est connectée à une extrémité d'entrée de courant de la seconde triode. Un courant amplifié par la structure d'amplification de courant circule dans la lampe torche. La présente invention résout le problème de chauffage de triode intense et réduit la quantité de chaleur générée dans le circuit de commande de lampe torche.
PCT/CN2019/085295 2018-09-17 2019-04-30 Circuit de commande de lampe torche et terminal mobile WO2020057135A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201811080114.6 2018-09-17
CN201811080114.6A CN109275246B (zh) 2018-09-17 2018-09-17 闪光灯控制电路及移动终端

Publications (1)

Publication Number Publication Date
WO2020057135A1 true WO2020057135A1 (fr) 2020-03-26

Family

ID=65189493

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2019/085295 WO2020057135A1 (fr) 2018-09-17 2019-04-30 Circuit de commande de lampe torche et terminal mobile

Country Status (2)

Country Link
CN (1) CN109275246B (fr)
WO (1) WO2020057135A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109275246B (zh) * 2018-09-17 2021-02-26 深圳市泰衡诺科技有限公司 闪光灯控制电路及移动终端

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001135484A (ja) * 1999-11-02 2001-05-18 Ship & Ocean Foundation 点滅電球への突入電流制御方法
CN103036550A (zh) * 2012-12-11 2013-04-10 电子科技大学 一种快速放电的光电继电器
CN104062535A (zh) * 2014-06-13 2014-09-24 苏州华徕光电仪器有限公司 一种感应式交流验电笔电路
CN204031517U (zh) * 2014-06-10 2014-12-17 惠州市桑莱士光电有限公司 一种带双闪光灯的摄像头模组
CN206237652U (zh) * 2016-10-21 2017-06-09 上海与德信息技术有限公司 闪光灯控制电路及移动终端
CN109275246A (zh) * 2018-09-17 2019-01-25 深圳市泰衡诺科技有限公司 闪光灯控制电路及移动终端

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN206042472U (zh) * 2016-08-26 2017-03-22 宁波赛耐比光电科技股份有限公司 一种调光控制电路

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001135484A (ja) * 1999-11-02 2001-05-18 Ship & Ocean Foundation 点滅電球への突入電流制御方法
CN103036550A (zh) * 2012-12-11 2013-04-10 电子科技大学 一种快速放电的光电继电器
CN204031517U (zh) * 2014-06-10 2014-12-17 惠州市桑莱士光电有限公司 一种带双闪光灯的摄像头模组
CN104062535A (zh) * 2014-06-13 2014-09-24 苏州华徕光电仪器有限公司 一种感应式交流验电笔电路
CN206237652U (zh) * 2016-10-21 2017-06-09 上海与德信息技术有限公司 闪光灯控制电路及移动终端
CN109275246A (zh) * 2018-09-17 2019-01-25 深圳市泰衡诺科技有限公司 闪光灯控制电路及移动终端

Also Published As

Publication number Publication date
CN109275246A (zh) 2019-01-25
CN109275246B (zh) 2021-02-26

Similar Documents

Publication Publication Date Title
US3659121A (en) Constant current source
US20180226787A1 (en) Under voltage lockout circuit and device integrating with the same and reference voltage generating circuit
WO2020057135A1 (fr) Circuit de commande de lampe torche et terminal mobile
US7880126B2 (en) Current detection circuit, light receiving device using the same, and electronic device
US20130257442A1 (en) Power source detection circuit and electronic device with power source detection circuit
JP2002314341A (ja) 送信器の検波回路
JPH0374529B2 (fr)
US8452558B2 (en) Test circuit for testing flexible printed circuit
CN211791454U (zh) 一种功率放大器的功率控制电路
US7859323B2 (en) Negative output regulator circuit and electrical apparatus using same
US10141892B1 (en) Bias circuit for supplying a bias current to a RF power amplifier
TWI414880B (zh) 濾光片切換元件控制電路
JP2007107925A (ja) 電流検出回路およびそれを用いた受光装置ならびに電子機器
CN111478676A (zh) 一种功率放大器的功率控制电路
CN211791452U (zh) 一种功率放大器的控制电路
WO2019161714A1 (fr) Circuit de commande, dispositif de pilotage d'une source de lumière et équipement d'affichage
CN106444950A (zh) 一种宽耐压范围的低压差线性稳压器、芯片及通信终端
US4647175A (en) Circuit arrangement for an electronic exposure meter
WO2017049832A1 (fr) Circuit de décharge, alimentation électrique et dispositif d'affichage
JPS6025743B2 (ja) 電流比較回路
CN210042298U (zh) 一种基于镜像电流源的led驱动电路
CN110687954B (zh) 背光芯片及屏幕补光电路
CN217824719U (zh) 一种电流输入输出控制电路
US3978498A (en) Exposure time control circuit of shutter of a camera
JPH04278611A (ja) 定電流回路

Legal Events

Date Code Title Description
NENP Non-entry into the national phase

Ref country code: DE

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC (EPO FORM 1205 DATED 12.05.2021)

122 Ep: pct application non-entry in european phase

Ref document number: 19863728

Country of ref document: EP

Kind code of ref document: A1