WO2019210532A1 - 一种终端摄像头防护电路 - Google Patents

一种终端摄像头防护电路 Download PDF

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Publication number
WO2019210532A1
WO2019210532A1 PCT/CN2018/086918 CN2018086918W WO2019210532A1 WO 2019210532 A1 WO2019210532 A1 WO 2019210532A1 CN 2018086918 W CN2018086918 W CN 2018086918W WO 2019210532 A1 WO2019210532 A1 WO 2019210532A1
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WIPO (PCT)
Prior art keywords
circuit
protection module
choke
coil motor
voice coil
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Application number
PCT/CN2018/086918
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English (en)
French (fr)
Inventor
徐波
王朝
董洁
王毅
孙乔
孙智勇
Original Assignee
华为技术有限公司
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 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP18917483.2A priority Critical patent/EP3780572B1/en
Priority to EP23173586.1A priority patent/EP4344000A1/en
Priority to US17/051,977 priority patent/US11165247B2/en
Priority to CN201880093075.5A priority patent/CN112055960B/zh
Publication of WO2019210532A1 publication Critical patent/WO2019210532A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/005—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection avoiding undesired transient conditions
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/11—Printed elements for providing electric connections to or between printed circuits
    • H05K1/115—Via connections; Lands around holes or via connections
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
    • H02H9/046—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere responsive to excess voltage appearing at terminals of integrated circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils

Definitions

  • the present application relates to the field of terminal technologies, and in particular, to a terminal camera protection circuit.
  • the camera assembly is very close to the antenna position.
  • the complex circuit structure inside the camera is compared with the length of the antenna.
  • the wireless signal is absorbed to reduce the antenna efficiency; on the other hand, the electromagnetic interference of the corresponding frequency is radiated externally, and the antenna sensitivity is lowered. Due to the strict antenna design environment, the use of metal parts on the camera assembly is limited, so the fixed bracket of the camera is replaced by a plastic bracket.
  • the voice coil motor cannot be effectively grounded, causing ESD (Electro-Static discharge, ESD).
  • ESD Electro-Static discharge
  • the electrostatic discharge flows through the position of the camera lens of the terminal housing to the camera voice coil motor housing.
  • the secondary discharge of the coil flows through the coil to the camera substrate, affecting the sensitivity of the antenna, causing damage to the camera drive circuit, and problems such as unfocusing, fixed screen, flower screen, etc., and system crashes.
  • the problem of electrostatic discharge ESD is solved by attaching conductive cloth and conductive copper foil to the outside of the camera module, so that the voice coil motor VCM (Voice Coil Motor, hereinafter referred to as VCM) can effectively avoid suspension, thereby solving the problem.
  • VCM Voice Coil Motor
  • the embodiment of the present application provides a voice coil motor VCM protection circuit, which prevents the voice coil motor VCM from affecting the antenna sensitivity and avoids electrostatic discharge, which causes damage to the driving circuit of the camera, resulting in abnormal photos such as out-of-focus, fixed screen, and flower screen, and system crash.
  • the problem In order to solve the above technical problem, the embodiment of the present application adopts the following technical solutions:
  • an embodiment of the present application provides a voice coil motor VCM protection circuit, including:
  • a first circuit one end of which is connected to one end of the voice coil motor VCM as a first node, and the other end of which is connected to a power supply terminal VDD of the voice coil motor drive circuit as a third node;
  • the second circuit has one end connected to the other end of the voice coil motor VCM as a second node, and the other end of which is connected to the voice coil motor drive circuit current return terminal ISINK as a fifth node.
  • a first protection module one end of which is connected to the third node, and the other end of which is connected to the digital ground DGND as a fourth node;
  • a second protection module one end of which is connected to the third node, and the other end of which is connected to the voice coil motor drive circuit reference ground VCM_GND as a seventh node;
  • the third protection module has one end connected to the fifth node and the other end connected to DGND as a sixth node.
  • the first circuit and the second circuit are choke circuits including a choke inductor.
  • the choke circuit includes one of the following:
  • One or more choke inductors in parallel with one or more capacitors; or
  • One or more choke inductors are connected in parallel with one or more capacitors and then in series with one or more choke inductors.
  • the first protection module is composed of a first device and a second device in parallel, and has the following possibilities:
  • the second device is a capacitor
  • the second device is vacant; or,
  • the second device is vacant.
  • the second protection module is composed of a third device and a fourth device in parallel, and has the following possibilities:
  • the fourth device is a capacitor
  • the third device is a capacitor and the fourth device is vacant.
  • the third protection module is composed of a fifth device and a sixth device in parallel, including the following situations:
  • the fifth device is a transient suppression diode TVS, and the sixth device is a capacitor; or
  • the fifth device is a transient suppression diode TVS, and the sixth device is vacant.
  • the first protection module and the second protection module have a capacitance of 0201 and a capacitance value of 1 nF to 4.7 ⁇ F.
  • the transient suppression diode TVS has an ESD of -15V or +15V, and the reverse breakdown current is 1mA, and the breakdown voltage is 6V to 9V, the off-state voltage is greater than or equal to 4.5V, the clamp voltage is 7V to 12V, the maximum pulse peak current is 2.5A, the junction capacitance is less than 33pF, and the general 8us-20us pulse test waveform.
  • the capacitance of the third protection module capacitor is 10 pF-100 pF.
  • the embodiment of the present application provides a printed circuit board PCB of a voice coil motor VCM protection circuit, including: a top layer of the PCB includes a first circuit and a second circuit, a first protection module, and a second protection module, Third protection module;
  • the first circuit is connected to the first protection module and placed close to the voice coil motor VCM coil connection point, and the first protection module return end is directly connected to the DGND through the through hole of the PCB;
  • the second protection module is connected and placed close to the driving circuit, and the return end of the second protection module is directly connected to the VCM_GND through the through hole of the PCB.
  • the second circuit is connected to the third protection module and placed near the voice coil motor VCM coil connection point, and the third protection module return end is directly connected to the DGND through the PCB through hole.
  • the first circuit and the second circuit are choke circuits including a choke inductor.
  • the choke circuit includes one of the following conditions:
  • One or more choke inductors in parallel with one or more capacitors; or
  • One or more choke inductors are connected in parallel with one or more capacitors and then in series with one or more choke inductors.
  • the first protection module is composed of a first device and a second device in parallel, including the following cases:
  • the second device is a capacitor
  • the second device is vacant; or,
  • the second device is vacant.
  • the second protection module is composed of a third device and a fourth device in parallel, including the following situations:
  • the fourth device is a capacitor
  • the third device is a capacitor and the fourth device is vacant.
  • the third protection module is composed of a fifth device and a sixth device in parallel, including the following cases:
  • the fifth device is a transient suppression diode TVS, and the sixth device is a capacitor; or
  • the fifth device is a transient suppression diode TVS, and the sixth device is vacant.
  • connecting VCM_VDD and VCM_GND requires a trace along with the trace and is completely wrapped by DGND.
  • VCM_VDD and ISINK connecting the voice coil motor VCM coil connection points need to be individually routed and distributed completely enclosed by the DGDN.
  • the first circuit and the second circuit are connected to the wiring and pads of the voice coil motor VCM coil connection point, and the bottom layer from the top layer to the PCB is completely cleaned, that is, not laid.
  • the embodiment of the present application can connect the choke inductor to both ends of the voice coil motor VCM and connect the protection module at a critical position of the circuit, thereby avoiding the electrostatic sensitivity and the loss of the antenna and the failure of the driving circuit to cause unfocusing.
  • the problem with the flower screen can connect the choke inductor to both ends of the voice coil motor VCM and connect the protection module at a critical position of the circuit, thereby avoiding the electrostatic sensitivity and the loss of the antenna and the failure of the driving circuit to cause unfocusing.
  • FIG. 1 is a schematic diagram of a terminal camera protection circuit in an embodiment of the present application.
  • FIG. 2(a) is a schematic diagram showing a sinusoidal circuit as a primary filter circuit in the embodiment of the present application
  • FIG. 2(b) is a schematic diagram showing a turbulence circuit as a primary filter circuit in the embodiment of the present application
  • 3(a) is a schematic diagram of a snubber circuit as a secondary filter circuit in the embodiment of the present application;
  • FIG. 3(b) is a schematic diagram showing a trickle circuit as a secondary filter circuit in the embodiment of the present application.
  • FIG. 4 is a schematic diagram of a first protection module in an embodiment of the present application.
  • Figure 5 is a schematic diagram of a second protection module in the embodiment of the present application.
  • FIG. 6 is a schematic diagram of a third protection module in an embodiment of the present application.
  • FIG. 7 is a schematic diagram of a printed circuit PCB in an embodiment of the present application.
  • the embodiment of the present application provides a protection circuit 100 for a terminal camera, including a driving circuit 101 , a voice coil motor VCM 102 , a first circuit 103 , a second circuit 104 , and a first protection module 105 .
  • One end of the voice coil motor VCM102 is connected to one end of the first circuit 102 as a first node N, and the other end of the voice coil motor VCM102 is connected to one end of the second circuit 103 as a second node G.
  • the other end of the first circuit 102 is connected to the voice coil motor drive circuit power supply terminal VDD as a third node D.
  • One end of the first protection module 105 is connected to the third node D, and the other end is connected to the digital ground DGND, which is the fourth node A.
  • One end of the second protection module 106 is connected to the third node D, and the other end is connected to the voice coil motor drive circuit reference ground VCM_GND as the seventh node M.
  • the other end of the second circuit 104 is connected to the voice coil motor drive circuit current return terminal ISISK as a fifth node C.
  • One end of the first device 107 is connected to the fifth node C, and the other end is connected to the digital ground DGND as the sixth node V.
  • the first circuit 102 and the second circuit 103 are choke circuits including a choke inductor, and the first device is a transient suppression diode TVS.
  • the power supply terminal VDD_2V8 of the main board 108 supplies power to the circuit 100, and the grounding end of the main board 108 is grounded in two ways, one is connected to the digital ground DGND, and the other is connected to the voice coil motor reference ground VCM_GND.
  • the power supply terminal VDD_2V8 of the main board 108 supplies power to the circuit 100.
  • the current flows to the third node D, the current is divided into two paths, one way to the first circuit 103, and the first circuit 103 is used to avoid the influence of the voice coil motor on the antenna during the driving process.
  • the inductance of the flow inductor is selected according to the type of the antenna and the corresponding frequency characteristics to reduce the influence of the voice coil motor drive circuit on the antenna.
  • the first protection module 105 and the third protection module 107 are respectively placed close to the voice coil motor coil 102 for discharging the electrostatic discharge ESD energy in two directions of the voice coil motor coil, and the second protection module 106 is placed close to the driving circuit 101 for With the first protection module 105 and the third protection module 107, when the first protection module 105 and the third protection module 107 fail to achieve the optimal suppression effect on the electrostatic discharge ESD, the drive circuit 101 is protected to avoid the failure of the drive circuit 101. Causes problems such as out of focus, fixed screen, etc. The other path of current flows to the VDD terminal of the drive circuit to supply power to the drive circuit.
  • the first circuit and the second circuit are choke circuits including a choke inductor, and the choke circuit is used to reduce the influence of the voice coil motor on the antenna in the camera module.
  • the choke circuit is a primary filter circuit
  • the choke circuit reduces the influence on a specific frequency antenna in the camera module. For example, when the selected choke inductor has an inductance value of 18 nH and its SFR frequency is around 2.5 Ghz, the primary filter circuit relatively reduces the influence of the voice coil motor on the 2.4 Ghz to 2.5 Ghz antenna.
  • Figure 2 (a) and Figure 2 (b) correspond to two cases where the choke circuit is a primary filter circuit.
  • the choke circuit 200 is a primary filter circuit, which is composed of two choke inductors connected in parallel, and one end of the choke inductor 201 and the choke inductor 202 is connected to the first node D, and One end is connected to the third node M.
  • the number of parallel choke inductors can be increased or decreased according to actual conditions.
  • the choke circuit 200 is composed of a choke inductor 201 and a capacitor 203 in parallel.
  • the number of parallels of the choke inductor and the number of parallel connections of the capacitor can be increased or decreased according to actual conditions.
  • the choke circuit when the choke circuit is a secondary filter circuit, the choke circuit can reduce the influence of the voice coil motor on antennas of different frequencies.
  • the choke inductor in the secondary filter circuit can reduce the influence of the voice coil motor on the antenna at two different frequencies of 880Mhz ⁇ 960Mhz low frequency and 2.4Ghz ⁇ 2.5Ghz high frequency, respectively.
  • Figure 3 (a) and Figure 3 (b) correspond to two cases where the choke circuit is a two-stage filter circuit.
  • the choke inductor 301 has one end connected to the second node G, the other end connected in series with the choke inductor 302 at the node P, and the choke inductor 302 is further connected. One end is connected to the fifth node C.
  • the number of choke inductors connected in series can be increased or decreased according to actual conditions.
  • the choke circuit 300 is formed by the choke inductor 303 and the capacitor 304 being connected in parallel between the second node G and the node P, and then connected to the choke inductor 305 at the node. P series.
  • the number of parallels of the flow inductors and the number of parallel connections of the capacitors, and the number of corresponding series choke inductors can be increased or decreased according to actual conditions.
  • the choke circuit 200 and the choke circuit 300 in the above embodiments can be applied to the first circuit 102 and the second circuit 104, respectively.
  • the first circuit 102 employs a choke circuit 200
  • the second circuit 104 employs a choke circuit 300
  • the first circuit 102 and the second circuit 104 each employ a choke circuit 300, which will not be enumerated herein.
  • the first circuit and the second circuit have a flow capacity greater than or equal to 150 mA, a DC resistance of less than 2 ⁇ , and the self-resonant frequency SFR is not lower than the operating frequency of the adjacent antenna.
  • the recommended inductance value of the choke inductor in the first circuit and the second circuit is 18 nH.
  • the embodiment of the present application provides a first protection module 400, including a first device 401 and a second device 402.
  • the first device 401 and the second device 402 are between the third node D and the fourth node A. in parallel.
  • the first device 401 is a Transient Voltage Suppressor (TVS)
  • the second device 402 is a capacitor.
  • TVS Transient Voltage Suppressor
  • the first device 401 is a capacitor
  • the second device is a vacancy
  • the corresponding branch is an open circuit.
  • the first device 401 is a transient suppression diode TVS
  • the second device is a vacancy
  • the corresponding branch is an open circuit.
  • the capacitance value of the capacitor is 1 nF - 4.7 ⁇ F, and the model number is 0201.
  • the embodiment of the present application provides a second protection module 500, including a third device 501 and a fourth device 502.
  • the third device 501 and the fourth device 502 are at the third node D and the seventh node M. Parallel between.
  • the third device 501 is a transient suppression diode TVS, and the fourth device 502 is a capacitor.
  • the third device 501 is a capacitor
  • the fourth device is a vacancy
  • the branch is an open circuit.
  • the embodiment of the present application provides a third protection module 600, including a fifth device 601 and a sixth device 602.
  • the fifth device 601 and the sixth device 602 are at the fifth node C and the sixth node V. Parallel between.
  • the fifth device 601 is a transient suppression diode TVS, and the sixth device 602 is a capacitor.
  • the sixth device when the fifth device is the transient suppression diode TVS, the sixth device is vacant, and the branch is open circuit.
  • the capacitance of the sixth device 602 has a capacitance value of 10 pF to 100 pF.
  • the transient suppression diode TVS mentioned in all of the above embodiments has an ESD of -15V or +15V, a breakdown current of 1mA, a breakdown voltage of 6V to 9V, and an off-state voltage of 4.5V or more.
  • the clamp voltage is 7V to 12V, the maximum pulse peak current is 2.5A, the junction capacitance is less than 33pF, and the general 8us-20us pulse test waveform.
  • FIG. 7 is a schematic diagram of a circuit of a voice coil motor VCM printed circuit board PCB according to an embodiment of the present application.
  • the PCB has a four-layer circuit, the four-layer circuit has a through hole, and the components of the voice coil motor VCM protection circuit are placed on the top layer.
  • the top layer of the PCB includes a first circuit 701 and a second circuit 702, a first protection module 703 and a second protection module 704, and a third protection module 705.
  • the first circuit 701 is connected to the first protection module 703 and placed close to the voice coil motor VCM coil connection point, and the return end of the first protection module 703 is directly connected to the DGND through the through hole of the PCB.
  • the second protection module 704 is connected and placed close to the driving circuit.
  • the reflow end of the second protection module is directly connected to the VCM_GND through the through hole of the PCB, and the second circuit 702 and the third protection module 705 are placed close to the VCM coil connection point of the voice coil motor.
  • the return end of the three protection modules is directly connected to DGND through the PCB via.
  • first circuit 701 and the second circuit 702 are choke circuits including a choke inductor.
  • the first circuit 701 and the second circuit 702 only correspond to the case where only one choke inductor is included, and the second guard module 704 corresponds to the case where only the capacitor is used.
  • the third protection module 705 corresponds to the possibility of using only the transient suppression diode TVS.
  • the power supply terminal VCM_VDD of the driving circuit and the reference ground VCM_GND need to be accompanied by a trace, and the DGND is completely packaged and isolated from other signals.
  • the traces of VCM_VDD and the circuit return terminal ISINK connected to the voice coil motor connection point need to be individually routed, and need to be completely wrapped with DGND and isolated from other signals.
  • the traces and pads of the first circuit and the second circuit connected to the connection point of the voice coil motor coil need to be completely emptied from the top layer of the PCB to the bottom layer, that is, the ground is not laid.
  • the three signals of the power supply terminal VCM_VDD, the reference ground VCM_GND, and the circuit return terminal ISISK are determined according to a specific design, and may be applied to the top layer of the PCB, and one or more layers of the second layer and the third layer are completed.
  • the first circuit and the second circuit are choke circuits, and when the choke circuit is a primary filter circuit, one of the following cases is included:
  • One or more choke inductors are connected in parallel with one or more capacitors.
  • the choke circuit is a secondary filter circuit
  • one of the following cases is included:
  • One or more choke inductors are connected in parallel with one or more capacitors and then in series with one or more choke inductors.
  • the first circuit and the second circuit adopt a primary filter circuit or a secondary filter circuit according to actual needs.
  • the first protection module is composed of a first device and a second device in parallel, and the first protection module 703 includes one of the following situations:
  • the second device is a capacitor
  • the second device is vacant; or,
  • the second device When the first device is a capacitor, the second device is vacant, and the corresponding branch is open.
  • the second guard module 704 is constructed by the third device and the fourth device in parallel, including one of the following:
  • the fourth device is a capacitor
  • the third device is a capacitor, the fourth device is vacant, and the corresponding branch is open.
  • the third guard module 705 is composed of a fifth device and a sixth device in parallel, including one of the following:
  • the fifth device is a transient suppression diode TVS, and the sixth device is a capacitor; or
  • the fifth device is a transient suppression diode TVS
  • the sixth device is vacant, and the corresponding branch is open.
  • the capacitance used by the choke circuit can be either a lumped capacitor or a coupling capacitor, such as PCB coupling.
  • the choke inductor in the above embodiment is an inductor that acts as a turbulence, and the specific model is selected according to actual needs.

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Abstract

本申请实施例提供了一种终端摄像头的防护电路，用于防护由于静电释放而造成天线灵敏度降低或驱动电路失效的问题。该防护电路包括驱动电路、音圈马达VCM、第一电路和第二电路、第一防护模块、第二防护模块、第三防护模块。第一电路和第二电路为扼流电感或其扼流电路，连接在音圈马达VCM两端，第一防护模块、第二防护模块、第三防护模块连接在电路的其他关键位置。本申请还提供了一种印刷电路PCB，PCB的顶层用于摆放器件，根据设计需要，需要用到PCB的多层进行信号的走线。

Description

一种终端摄像头防护电路 技术领域
本申请涉及终端技术领域，尤其涉及一种终端摄像头防护电路。
背景技术
随着终端占屏比的提升，摄像头组件距离天线位置十分接近。同时，摄像头内部复杂的电路结构与天线长度相比拟时，一方面吸收无线信号，降低天线效率；另一方面会对外辐射相应频率的电磁干扰，降低天线灵敏度。由于天线设计环境严格，限制摄像头组件上金属部件的使用，所以将摄像头的固定支架换为塑胶支架。
由于塑胶支架的使用，导致音圈马达不能有效接地，造成静电释放ESD(Electro-Static discharge，以下简称ESD)，静电释放通过终端外壳的摄像头镜片的位置流动到摄像头音圈马达外壳上，对内部线圈二次放电通过线圈流到摄像头基板上，影响天线灵敏度，导致摄像头驱动电路损坏，出现不对焦、定屏、花屏等拍照异常以及系统死机等问题。目前解决静电释放ESD问题多通过在摄像头模组外侧贴导电布、导电铜箔等方式，使音圈马达VCM(Voice Coil Motor，以下简称VCM)有效避免悬浮，以解决该问题。但采用这样的方式无法解决天线受影响的问题，同时成本增加。
发明内容
本申请的实施例提供了一种音圈马达VCM防护电路，实现了避免音圈马达VCM影响天线灵敏度以及避免静电释放使摄像头的驱动电路损坏导致不对焦、定屏、花屏等拍照异常以及系统死机的问题。为了解决上述技术问题，本申请实施例采用如下技术方案：
第一方面，本申请实施例提供了一种音圈马达VCM防护电路，包括：
音圈马达VCM；
第一电路，其一端与音圈马达VCM一端连接为第一节点，其另一端与音圈马达驱动电路供电端VDD相连为第三节点；
第二电路，其一端与音圈马达VCM另一端相连为第二节点，其另一端与音圈马达驱动电路电流回流端ISINK连接为第五节点。
第一防护模块，其一端与所述第三节点连接，其另一端连接数字地DGND为第四节点；
第二防护模块，其一端与所述第三节点连接，其另一端与所述音圈马达驱动电路参考地VCM_GND相连为第七节点；
第三防护模块其一端与所述第五节点连接，其另一端连接DGND为第六节点。通过上述电路的连接方式，可以有效解决天线受影响的问题。
第一电路和第二电路为包括扼流电感的扼流电路。
结合第一方面，扼流电路包括以下情况中的一种：
单一的扼流电感；或
两个或多个扼流电感并联；或
一个或多个扼流电感和一个或多个电容并联；或
两个或多个扼流电感串联；或
一个或多个扼流电感与一个或多个电容并联，然后再与一个或多个扼流电感串联。
通过上述实现方式，不仅可以减少音圈马达对某一特定频率天线的影响，也可以减少音圈马达对多个不同频率天线的影响。结合第一方面，第一防护模块由第一器件和第二器件并联组成，具有以下几种可能：
第一器件为瞬态抑制二极管TVS时，第二器件为电容；或者，
第一器件为瞬态抑制二极管TVS时，第二器件为空缺；或者，
第一器件为电容时，第二器件空缺。
结合第一方面，第二防护模块由第三器件和第四器件并联组成，具有以下几种可能：
第三器件为瞬态抑制二极管TVS时，第四器件为电容；或者，
第三器件为电容，所述第四器件空缺。
结合第一方面，第三防护模块由第五器件和第六器件并联组成，包括以下几种情况：
第五器件为瞬态抑制二极管TVS，第六器件为电容；或者，
所述第五器件为瞬态抑制二极管TVS，所述第六器件空缺。
结合第一方面，第一防护模块和第二防护模块的电容的型号为0201，电容值为1nF-4.7μF。
结合第一方面，第一防护模块和第二防护模、第三防护模块的瞬态抑制二极管TVS的静电释放EDS为-15V或+15V、反向击穿电流为为1mA时，击穿电压为6V到9V、关态电压大于或等于4.5V、箝位电压7V到12V、最大脉冲峰值电流最小值为2.5A、结电容小于33pF，通用8us-20us脉冲测试波形。
结合第一方面，第三防护模块电容的电容值为10pF-100pF。
第二方面，本申请实施例提供了一种音圈马达VCM防护电路的印刷电路板PCB,包括：所述PCB的顶层包括第一电路和第二电路、第一防护模块和第二防护模块、第三防护模块；
第一电路与第一防护模块连接并靠近音圈马达VCM线圈连接点放置，第一防护模块回流端直接通过PCB的通孔连接DGND；
第二防护模块连接并靠近驱动电路放置，第二防护模块回流端直接通过PCB的通孔连接VCM_GND。
第二电路与第三防护模块连接并靠近音圈马达VCM线圈连接点放置，第三防护模块回流端直接通过PCB通孔连接DGND。
结合第二方面，第一电路和第二电路为包括扼流电感的扼流电路。
结合第二方面，扼流电路包括以下情况中的一种：
单一的扼流电感；或
两个或多个扼流电感并联；或
一个或多个扼流电感和一个或多个电容并联；或
两个或多个扼流电感串联；或
一个或多个扼流电感与一个或多个电容并联，然后再与一个或多个扼流电感串联。
结合第二方面，第一防护模块由第一器件和第二器件并联构成，包括以下几种情况：
第一器件为瞬态抑制二极管TVS时，第二器件为电容；或者，
第一器件为瞬态抑制二极管TVS时，第二器件为空缺；或者，
第一器件为电容时，第二器件空缺。
结合第二方面，第二防护模块由第三器件和第四器件并联构成，包括以下几种情况：
第三器件为瞬态抑制二极管TVS时，第四器件为电容；或者，
第三器件为电容，第四器件空缺。
结合第二方面，第三防护模块由第五器件和第六器件并联组成，包括以下几种情况：
第五器件为瞬态抑制二极管TVS，所述第六器件为电容；或者
第五器件为瞬态抑制二极管TVS，所述第六器件空缺。
结合第二方面，连接VCM_VDD和VCM_GND需要伴随走线并被DGND完整包起。
结合第二方面，连接音圈马达VCM线圈连接点的VCM_VDD和ISINK需要单独布线并分布被DGDN完整包起。
结合第二方面，第一电路和第二电路连接音圈马达VCM线圈连接点的布线和焊盘，从顶层到PCB的底层全部净空，即不铺地。
由上述技术方案可知，本申请实施例通过将音圈马达VCM两端连接扼流电感，以及在电路关键位置连接防护模块，能够避免静电释放造成天线灵敏度降低和驱动电路失效导致不对焦，定屏、花屏的问题。
附图说明
图1为本申请实施例中终端摄像头防护电路的示意图；
图2(a)为本申请实施例中扼流电路为一级滤波电路的示意图；
图2(b)为本申请实施例中扼流电路为一级滤波电路的示意图；
图3(a)为本申请实施例中扼流电路为二级滤波电路的示意图；
图3(b)为本申请实施例中扼流电路为二级滤波电路的示意图；
图4为本申请实施例中第一防护模块的示意图；
图5为本申请实施例中第二防护模块的示意图；
图6为本申请实施例中第三防护模块的示意图；
图7为本申请实施例中印刷电路PCB的示意图。
具体实施方式
以下结合附图对本申请的具体实施方式进行说明。
如图1所示，本申请实施例提供了一种应用于终端摄像头的防护电路100，包括 驱动电路101、音圈马达VCM102、第一电路103、第二电路104、第一防护模块105、第二防护模块106、第三防护模块107，主板108。
其中，音圈马达VCM102一端与第一电路102的一端连接为第一节点N，音圈马达VCM102的另一端与第二电路103的一端连接为第二节点G。第一电路102另一端与音圈马达驱动电路供电端VDD连接为第三节点D。第一防护模块105一端与第三节点D连接，另一端连接数字地DGND，为第四节点A。第二防护模块106一端与第三节点D连接，另一端连接音圈马达驱动电路参考地VCM_GND为第七节点M。第二电路104另一端与音圈马达驱动电路电流回流端ISINK连接为第五节点C。第一器件107一端与第五节点C连接，另一端与数字地DGND连接为第六节点V。其中，第一电路102和第二电路103为包含扼流电感的扼流电路，第一器件为瞬态抑制二极管TVS。
以下以摄像头防护电路的工作过程来进一步说明本申请实施例。主板108供电端VDD_2V8向电路100供电，主板108接地端分两路接地，一路接数字地DGND，另一路接音圈马达参考地VCM_GND。主板108的供电端VDD_2V8向电路100供电，电流流到第三节点D时分为两路，一路流向第一电路103，第一电路103用于避免音圈马达在驱动过程中对天线的影响，扼流电感的电感值根据天线的类型和相应的频率特性对应选取，以降低音圈马达驱动电路对天线的影响。第一防护模块105和第三防护模块107分别靠近音圈马达线圈102放置，用于泄放音圈马达线圈两个方向的静电释放ESD能量，第二防护模块106靠近驱动电路101放置，用于配合第一防护模块105和第三防护模块107，当第一防护模块105和第三防护模块107未能达到对静电释放ESD达到最优抑制效果时，保护驱动电路101，避免驱动电路101失效，造成不对焦、定屏等问题。电流的另一路流向驱动电路VDD端，向驱动电路进行供电。
在上述实施例中，第一电路和第二电路为包括扼流电感的扼流电路，扼流电路用于减少摄像头模组中音圈马达对天线的影响。当扼流电路为一级滤波电路时，所述扼流电路对摄像头模组中某一特定频率天线减少影响。例如，当所选取的扼流电感的电感值为18nH时，其SFR频率在2.5Ghz左右，那么一级滤波电路相对减少音圈马达对频率在2.4Ghz到2.5Ghz天线的影响。
图2(a)和图2(b)分别对应扼流电路为一级滤波电路的两种情况。
图2(a)为扼流电路200为一级滤波电路的一种可能的情况，由两个扼流电感并联构成，扼流电感201和扼流电感202的一端连接到第一节点D，另外一端连接到第三节点M。
进一步的，并联的扼流电感数量可以根据实际情况增加或者减少。
在另一种可能的设计中，如图2(b)所示，扼流电路200由扼流电感201和电容203并联构成。
进一步的，扼流电感的并联数量和电容的并联数量可以根据实际情况增加或者减少。
在上述实施例中，当扼流电路为二级滤波电路时，所述扼流电路可以减少音圈马达对不同频率的天线的影响。例如在二级滤波电路中的扼流电感可以分别减少音圈马达对在880Mhz～960Mhz低频和2.4Ghz～2.5Ghz高频两个不同频率上对天线的影响。
图3(a)和图3(b)分别对应扼流电路为二级滤波电路的两种情况。
图3(a)为扼流电路300为二级滤波电路的一种情况，扼流电感301，一端连接第二节点G，另一端与扼流电感302在节点P处串联，扼流电感302另一端连接第五节点C。
进一步的，扼流电感串联的数量可以根据实际情况增加或者减少。
在另一种可能的设计中，如图3(b)所示，扼流电路300由扼流电感303和电容304在第二节点G和节点P间并联构成，再与扼流电感305在节点P串联。
进一步的，流电感的并联数量和电容的并联数量，以及相应串联扼流电感的数量可以根据实际情况增加或者减少。
上述实施例中的扼流电路200和扼流电路300，均可以应用于第一电路102和第二电路104。例如，第一电路102采用扼流电路200，第二电路104采用扼流电路300；或者第一电路102和第二电路104均采用扼流电路300，在此不再一一列举。
在一种可能的设计中，第一电路和第二电路的通流能力大于或等于150mA，直流阻抗小于2Ω，自谐振频率SFR不低于临近天线的工作频率。
在一种可能的实施方式中，第一电路和第二电路中扼流电感的推荐的电感值为18nH。
如图4所示，本申请实施例提供了一种第一防护模块400，包括第一器件401和第二器件402，第一器件401和第二器件402第三节点D和第四节点A间并联。其中第一器件401为瞬态抑制二极管TVS(Transient Voltage Suppressor，以下简称TVS)，第二器件402为电容。
在一种可能的实施方式中，在第一防护模块400中，第一器件401为电容，第二器件为空缺，对应支路为断路。
在一种可能的实施方式中，在第一防护模块400中，第一器件401为瞬态抑制二极管TVS，第二器件为空缺，对应支路为断路。
在上述实施例中，电容的电容值为1nF-4.7μF，型号为0201。
如图5所示，本申请实施例提供了一种第二防护模块500,包括第三器件501和第四器件502，第三器件501和第四器件502在第三节点D和第七节点M间并联。其中第三器件501为瞬态抑制二极管TVS，第四器件502为电容。
在一种可能的实施方式中，在第二防护模块500中，第三器件501为电容，第四器件为空缺，该支路为断路。
如图6所示，本申请实施例提供了一种第三防护模块600,包括第五器件601和第六器件602，第五器件601和第六器件602在第五节点C和第六节点V间并联。其中第五器件601为瞬态抑制二极管TVS，第六器件602为电容。
在一种可能的实施方式中，第五器件为瞬态抑制二极管TVS时，第六器件空缺，该支路为断路。
在一种可能的实施方式中，第六器件602电容的电容值为10pF-100pF。
上述所有实施例中提到的瞬态抑制二极管TVS的静电释放EDS为-15V或+15V、反向击穿电流为1mA时，击穿电压为6V到9V、关态电压大于或等于4.5V、箝位电压为7V到12V、最大脉冲峰值电流最小值为2.5A、结电容小于33pF，通用8us-20us脉冲测试波形。
图7为本申请实施例提供的一种音圈马达VCM印刷电路板PCB电路示意图，PCB具有四层电路，四层电路具有通孔，音圈马达VCM防护电路的器件都放置在顶层。
进一步的，PCB顶层包括第一电路701和第二电路702、第一防护模块703和第二防护模块704、第三防护模块705。第一电路701与第一防护模块703连接并靠近音圈马达VCM线圈连接点放置，第一防护模块703回流端直接通过PCB的通孔连接DGND。第二防护模块704连接并靠近所述驱动电路放置，第二防护模块回流端直接通过PCB的通孔连接VCM_GND，第二电路702与第三防护模块705靠近音圈马达VCM线圈连接点放置，第三防护模块回流端直接通过PCB通孔连接DGND。
进一步的，第一电路701和第二电路702为包括扼流电感的扼流电路。
其中，在图5中，第一电路701和第二电路702只对应了仅包含一个扼流电感的情况，第二防护模块704对应了只使用电容的这一种情况。第三防护模块705对应只使用瞬态抑制二极管TVS这一种可能。
进一步的，驱动电路的供电端VCM_VDD和参考地VCM_GND需要伴随走线，并且需要DGND完整包起，与其他信号隔离。VCM_VDD与电路回流端ISINK连接至音圈马达连接点的走线需要单独走线，需要分别与DGND完整包起并与其他信号隔离。
进一步的，第一电路和第二电路连接到音圈马达线圈连接点的走线、焊盘需要从PCB顶层到底层全部挖净空，即不铺地。
进一步的，供电端VCM_VDD、参考地VCM_GND、电路回流端ISINK三种信号走根据具体设计确定，可能应用到PCB顶层，第二层、第三层中的一层或多层完成。
在一种可能的设计中，第一电路和第二电路为扼流电路，扼流电路为一级滤波电路时，包括以下情况中的一种：
单一的扼流电感；或
两个或多个扼流电感并联；或
一个或多个扼流电感和一个或多个电容并联。
进一步的，扼流电路为二级滤波电路时，包括以下情况中的一种：
多个扼流电感串联；或
一个或多个扼流电感与一个或多个电容并联，然后再与一个或多个扼流电感串联。
进一步的，在一种可能的设计中，第一电路和第二电路根据实际需求采用一级滤波电路或二级滤波电路。
在一种可能的设计中，第一防护模块由第一器件和第二器件并联构成，第一防护模块703包括以下几种情况中的一种：
第一器件为瞬态抑制二极管TVS时，第二器件为电容；或者，
第一器件为瞬态抑制二极管TVS时，第二器件为空缺；或者，
第一器件为电容时，第二器件空缺，对应支路为断路。
在一种可能的设计中，第二防护模块704由第三器件和第四器件并联构成，包括以下情况中的一种：
第三器件为瞬态抑制二极管TVS时，第四器件为电容；或者，
第三器件为电容，第四器件空缺，对应支路为断路。
在一种可能的设计中，第三防护模块705由第五器件和第六器件并联组成，包括以下情况中的一种：
第五器件为瞬态抑制二极管TVS，所述第六器件为电容；或者
第五器件为瞬态抑制二极管TVS，所述第六器件空缺，对应支路为断路。
进一步的，在一种可能的设计中，扼流电路使用的电容可以采用集总电容，也可以采用耦合电容的方式替代实现，例如PCB耦合。
进一步的，上述实施例中所述扼流电感为起到扼流作用的电感，具体型号根据实际需求选用。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (13)

  1. 一种音圈马达VCM防护电路，其特征在于，包括：
    音圈马达VCM，所述音圈马达VCM两端分别与第一电路和第二电路相连；
    所述第一电路，所述第一电路为包括扼流电感的扼流电路，其一端与所述音圈马达VCM一端连接为第一节点，其另一端与音圈马达驱动电路供电端VDD相连为第三节点；
    所述第二电路，所述第二电路为包括扼流电感的扼流电路，其一端与所述音圈马达VCM另一端相连为第二节点，其另一端与音圈马达驱动电路电流回流端ISINK连接为第五节点。
  2. 根据权利要求1所述的防护电路，其特征在于，所述扼流电路包括以下情况中的一种：
    单一的扼流电感；或
    两个或多个扼流电感并联；或
    一个或多个扼流电感和一个或多个电容并联；或
    两个或多个扼流电感串联；或
    一个或多个扼流电感与一个或多个电容并联，然后再与一个或多个扼流电感串联。
  3. 根据权利要求1所述的防护电路，其特征在于，进一步包括：
    第一防护模块，其一端与所述第三节点连接，其另一端连接数字地DGND为第四节点；
    第二防护模块，其一端与所述第三节点连接，其另一端与所述音圈马达驱动电路参考地VCM_GND相连为第七节点；
    第三防护模块其一端与所述第五节点连接，其另一端连接DGND为第六节点。
  4. 根据权利要求3所述的第一防护模块由第一器件和第二器件并联组成，其特征在于，包括：
    所述第一器件为瞬态抑制二极管TVS时，第二器件为电容；或者，
    所述第一器件为瞬态抑制二极管TVS时，第二器件为空缺；或者，
    所述第一器件为电容时，第二器件空缺。
  5. 根据权利要求3所述的第二防护模块由第三器件和第四器件并联组成，其特征在于，包括：
    所述第三器件为瞬态抑制二极管TVS时，第四器件为电容；或者，
    所述第三器件为电容，所述第四器件空缺。
  6. 根据权利要求5所述的第三防护模块由第五器件和第六器件并联组成，其特征在于，包括以下几种情况：
    所述第五器件为瞬态抑制二极管TVS，所述第六器件为电容；或者
    所述第五器件为瞬态抑制二极管TVS，所述第六器件空缺。
  7. 一种音圈马达VCM防护电路的印刷电路板PCB，其特征在于，包括：
    所述PCB的顶层包括第一电路和第二电路、第一防护模块和第二防护模块、第三防护模块；
    第一电路与第一防护模块连接并靠近所述音圈马达VCM线圈连接点放置，第一防护模块回流端直接通过PCB的通孔连接DGND，所述第一电路为包括扼流电感的扼流电路,；
    第二防护模块连接并靠近所述驱动电路放置，第二防护模块回流端直接通过所述PCB的通孔连接VCM_GND；
    第二电路与第三防护模块连接并靠近音圈马达VCM线圈连接点放置，所述第三防护模块回流端直接通过PCB通孔连接DGND，所述第二电路为包括扼流电感的扼流电路。
  8. 根据权利要求7所述的PCB，其特征在于，所述第一防护模块由第一器件和第二器件并联构成，包括以下几种情况：
    所述第一器件为瞬态抑制二极管TVS时，第二器件为电容；或者，
    所述第一器件为瞬态抑制二极管TVS时，第二器件为空缺；或者，
    所述第一器件为电容时，第二器件空缺。
  9. 根据权利要求7所述的PCB，其特征在于，所述第二防护模块由第三器件和第四器件并联构成，包括以下几种情况：
    所述第三器件为瞬态抑制二极管TVS时，第四器件为电容；或者，
    所述第三器件为电容时，所述第四器件空缺。
  10. 根据权利要求7所述的PCB，其特征在于，所述第三防护模块由第三器件和第四器件并联构成，包括以下几种情况：
    所述第五器件为瞬态抑制二极管TVS时，第六器件为电容；或者，
    所述第五器件为瞬态抑制二极管TVS时，所述第六器件空缺。
  11. 根据权利要求7所述的PCB，其特征在于，连接VCM_VDD和VCM_GND需要伴随走线并被DGND完整包起。
  12. 根据权利要求7所述的PCB，其特征在于，连接所述音圈马达VCM线圈连接点的VCM_VDD和ISINK需要单独布线并分布被DGDN完整包起。
  13. 根据权利要求7-12任一项所述的PCB，其特征在于，所述第一电路和第二电路连接所述音圈马达VCM线圈连接点的布线和焊盘，从所述顶层到所述PCB的底层全部净空。
PCT/CN2018/086918 2018-05-02 2018-05-15 一种终端摄像头防护电路 WO2019210532A1 (zh)

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EP18917483.2A EP3780572B1 (en) 2018-05-02 2018-05-15 Protective circuit for camera of terminal
EP23173586.1A EP4344000A1 (en) 2018-05-02 2018-05-15 Protective circuit for camera of terminal
US17/051,977 US11165247B2 (en) 2018-05-02 2018-05-15 Protection circuit for terminal camera
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EP3780572A1 (en) 2021-02-17

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