Camera driver circuit and corresponding camera device

Abstract

This invention provides a camera driving circuit and a corresponding camera device. A voltage conversion module converts an external power supply voltage to generate a first voltage. When the first voltage is enabled, a microphone power supply module converts the first voltage to generate a microphone power supply voltage, which powers the microphone module. When the microphone power supply voltage is enabled, a device power supply module converts the first voltage to generate a device power supply voltage, which powers the device module. When the device power supply voltage is enabled, a chip power supply module converts the first voltage to generate a chip power supply voltage, which powers the main control chip. When the main control chip receives the chip power supply voltage, its reset pin is in normal operating condition, thus ensuring the main control chip is in normal operating condition.

Description

Technical Field

[0001] This utility model relates to the field of circuit technology, and in particular to a camera driving circuit and a corresponding camera device. Background Technology

[0002] In modern society, cameras are video input devices widely used in video conferencing, telemedicine, and real-time monitoring. During camera operation, the driver circuit must first supply power to the camera before it can start. Furthermore, cameras are equipped with a reset module for resetting the camera. However, in existing cameras, due to an unreasonable power supply sequence for the various modules, some modules may not fully start, allowing the camera to reset even if it hasn't fully started. This can lead to camera malfunctions. Therefore, existing cameras suffer from a technical problem that makes them prone to failure.

[0003] Therefore, it is necessary to provide a camera driving circuit and a corresponding camera device to solve the above-mentioned technical problems. Utility Model Content

[0004] This invention provides a camera driving circuit and a corresponding camera device, which effectively solves the technical problem that existing cameras are prone to failure.

[0005] This utility model provides a camera driving circuit, which includes, The device module is used to realize various functions of the camera device; A microphone module is used to transmit audio information through a microphone; The main control chip connects the device module and the microphone module, and is used to interact with each module for data exchange. A voltage conversion module is used to perform a voltage conversion operation on the external power supply voltage output by the external power supply to generate a first voltage, wherein the external power supply voltage is 12V and the first voltage is 5V; A microphone power supply module includes a microphone power supply input terminal, a microphone power supply output terminal, and a microphone power supply enable terminal. The microphone power supply input terminal and the microphone power supply enable terminal are connected to the voltage conversion module. Under the enable action of a first voltage, the microphone power supply module is used to perform a voltage conversion operation on the first voltage to generate a microphone power supply voltage. The microphone power supply output terminal is used to output the microphone power supply voltage, which is used to power the microphone module. The microphone power supply voltage is 1.8V. The device power supply module includes a device power supply input terminal, a device power supply output terminal, and a device power supply enable terminal. The device power supply input terminal is connected to the voltage conversion module, and the device power supply enable terminal is connected to the microphone power supply output terminal. Under the enable action of the microphone power supply voltage, the device power supply module is used to perform a voltage conversion operation on the first voltage to generate a device power supply voltage. The device power supply output terminal is used to output the device power supply voltage, which is used to power the device module. The device power supply voltage is 3.3V. A chip power supply module includes a chip power supply input terminal, a chip power supply output terminal, and a chip power supply enable terminal. The chip power supply input terminal is connected to the voltage conversion module, and the chip power supply enable terminal is connected to the device power supply output terminal. Under the enable action of the device power supply voltage, the chip power supply module is used to perform a voltage conversion operation on the first voltage to generate a chip power supply voltage. The chip power supply output terminal is used to output the chip power supply voltage, which is used to power the main control chip. The chip power supply voltage is 0.94V. The main control chip includes a reset pin. When the main control chip receives the chip power supply voltage, the reset pin is in normal working condition, thereby enabling the main control chip to be in normal working condition.

[0006] Furthermore, the voltage conversion module includes a first voltage conversion chip, a first feedback resistor, and a second feedback resistor. The first voltage conversion chip includes a first input pin, a first output pin, and a first feedback pin. The first input pin is connected to the external power supply. One end of the first feedback resistor is connected to the first output pin, and the other end of the first feedback resistor is connected to the first feedback pin. One end of the second feedback resistor is connected to the first feedback pin, and the other end of the second feedback resistor is grounded. The first input pin is used to input the external power supply voltage, the first voltage conversion chip is used to perform voltage conversion operation on the external power supply voltage to generate a first voltage, the first output pin is used to output the first voltage, the first feedback resistor and the second feedback resistor are used to perform voltage division operation on the first voltage to generate a first feedback voltage, and the first voltage conversion chip adjusts the first voltage based on the first feedback voltage.

[0007] Furthermore, the microphone power supply input terminal and the microphone power supply enable terminal are connected to the first output pin. The microphone power supply module includes a second voltage conversion chip, a third feedback resistor, and a fourth feedback resistor. The second voltage conversion chip includes a second input pin, a second output pin, a first enable pin, and a second feedback pin. The second input pin is connected to the microphone power supply input terminal, and the first enable pin is connected to the microphone power supply enable terminal. One end of the third feedback resistor is connected to the second output pin, and the other end of the third feedback resistor is connected to the second feedback pin. One end of the fourth feedback resistor is connected to the second feedback pin, and the other end of the fourth feedback resistor is grounded. The second output pin is connected to the microphone power supply output terminal. The second input pin and the first enable pin are used to input the first voltage. The second voltage conversion chip is used to perform a voltage conversion operation on the first voltage under the enable action of the first voltage to generate a microphone power supply voltage. The second output pin is used to output the microphone power supply voltage. The third feedback resistor and the fourth feedback resistor are used to perform a voltage divider operation on the microphone power supply voltage to generate a second feedback voltage. The second voltage conversion chip adjusts the microphone power supply voltage based on the second feedback voltage.

[0008] Furthermore, the device power supply input terminal is connected to the first output pin, the device power supply enable terminal is connected to the second output pin, and the device power supply module includes a third voltage conversion chip, a fifth feedback resistor, and a sixth feedback resistor. The third voltage conversion chip includes a third input pin, a third output pin, a second enable pin, and a third feedback pin. The third input pin is connected to the device power supply input terminal, the second enable pin is connected to the device power supply enable terminal, one end of the fifth feedback resistor is connected to the third output pin, the other end of the fifth feedback resistor is connected to the third feedback pin, one end of the sixth feedback resistor is connected to the third feedback pin, the other end of the sixth feedback resistor is grounded, and the third output pin is connected to the device power supply output terminal. The third input pin is used to input the first voltage, the second enable pin is used to input the microphone power supply voltage, the third voltage conversion chip is used to perform a voltage conversion operation on the first voltage under the drive of the microphone power supply voltage to generate a device power supply voltage, the third output pin is used to output the device power supply voltage, the fifth feedback resistor and the sixth feedback resistor are used to perform a voltage divider operation on the device power supply voltage to generate a third feedback voltage, and the third voltage conversion chip adjusts the device power supply voltage based on the third feedback voltage.

[0009] Furthermore, the chip power supply input terminal is connected to the first output pin, the chip power supply enable terminal is connected to the third output pin, and the chip power supply module includes a fourth voltage conversion chip, a seventh feedback resistor, and an eighth feedback resistor. The fourth voltage conversion chip includes a fourth input pin, a fourth output pin, a third enable pin, and a fourth feedback pin. The fourth input pin is connected to the chip power supply input terminal, the third enable pin is connected to the chip power supply enable terminal, one end of the seventh feedback resistor is connected to the fourth output pin, the other end of the seventh feedback resistor is connected to the fourth feedback pin, one end of the eighth feedback resistor is connected to the fourth feedback pin, the other end of the eighth feedback resistor is grounded, and the fourth output pin is connected to the chip power supply output terminal. The fourth input pin is used to input the first voltage, the third enable pin is used to receive the device power supply voltage, the fourth voltage conversion chip is used to perform a voltage conversion operation on the first voltage under the drive of the device power supply voltage to generate a chip power supply voltage, the fourth output pin is used to output the chip power supply voltage, the seventh feedback resistor and the eighth feedback resistor are used to perform a voltage divider operation on the chip power supply voltage to generate a fourth feedback voltage, and the fourth voltage conversion chip adjusts the chip power supply voltage based on the fourth feedback voltage.

[0010] Furthermore, the model number of the first voltage conversion chip is SY81103EABT.

[0011] Furthermore, the model numbers of the second voltage conversion chip, the third voltage conversion chip, and the fourth voltage conversion chip are all LN1172A.

[0012] Furthermore, the voltage conversion module also includes a filter capacitor, one end of which is connected to the external power supply and the first input pin, and the other end of which is grounded. The filter capacitor is used to filter the external power supply voltage.

[0013] Furthermore, the voltage conversion module also includes a transient voltage suppression diode, which is connected in parallel with the filter capacitor. The transient voltage suppression diode is used to provide surge and overvoltage protection for the first voltage conversion chip.

[0014] A camera device comprising any of the camera driving circuits described above.

[0015] Compared with the prior art, the advantages of this utility model are as follows: This utility model provides a camera driving circuit, which includes a main control chip, a device module, a microphone module, a voltage conversion module, a microphone power supply module, a device power supply module, and a chip power supply module. The voltage conversion module converts the external power supply voltage output to generate a first voltage. Under the enabling action of the first voltage, the microphone power supply module converts the first voltage to generate a microphone power supply voltage, which powers the microphone module. Under the enabling action of the microphone power supply voltage, the device power supply module converts the first voltage to generate a device power supply voltage, which powers the device module. Under the enabling action of the device power supply voltage, the chip power supply module converts the first voltage to generate a chip power supply voltage, which powers the main control chip. When the main control chip receives the chip power supply voltage, its reset pin is in normal working condition, thus ensuring the main control chip is in normal working condition.

[0016] Therefore, this camera driver circuit can sequentially power each module of the circuit. Only after each module has started up does the camera driver circuit power the main control chip, ensuring the reset pin functions correctly. At this point, the user can reset the camera device. This effectively avoids the problem of resetting the camera before some modules have fully started, which could lead to camera malfunctions. The power supply sequence for each module in this camera driver circuit is reasonable, ensuring the normal operation of the entire system. Furthermore, the camera driver circuit first converts the 12V external power supply voltage to a 5V initial voltage through a voltage conversion module, and then converts the initial voltage to a voltage below 5V through other power supply modules, thus helping to ensure the accuracy and stability of the output voltage. This camera driver circuit effectively solves the technical problem of existing cameras being prone to malfunctions. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments are briefly introduced below. The drawings described below are only the corresponding drawings of some embodiments of this utility model.

[0018] Figure 1 This is a block diagram of an embodiment of the camera driving circuit of this utility model.

[0019] Figure 2 This is a circuit diagram of a voltage conversion module according to an embodiment of the camera driving circuit of this utility model.

[0020] Figure 3 This is a circuit diagram of the microphone power supply module of one embodiment of the camera driving circuit of this utility model.

[0021] Figure 4 This is a circuit diagram of the device power supply module of one embodiment of the camera driving circuit of this utility model.

[0022] Figure 5 This is a circuit diagram of the chip power supply module of one embodiment of the camera driving circuit of this utility model.

[0023] Figure 6 This is a circuit diagram of a microphone module according to an embodiment of the camera driving circuit of this utility model.

[0024] Figure 7 This is a circuit diagram of the WIFI unit of an embodiment of the camera driving circuit of this utility model.

[0025] Figure 8 This is a circuit diagram of the main control chip in one embodiment of the camera driving circuit of this utility model.

[0026] Figure 9 This is a circuit diagram of the storage unit of an embodiment of the camera driving circuit of this utility model.

[0027] In the diagram, 10 is the camera driver circuit; 11 is the voltage conversion module; 12 is the microphone power supply module; 121 is the microphone power supply input; 122 is the microphone power supply output; 123 is the microphone power supply enable; 13 is the device power supply module; 131 is the device power supply input; 132 is the device power supply output; 133 is the device power supply enable; 14 is the chip power supply module; 141 is the chip power supply input; 142 is the chip power supply output; 143 is the chip power supply enable; 15 is the device module; 151 is the WIFI unit; 152 is the storage unit; 16 is the microphone module; 1611 is the microphone; 1612 is the microphone signal transmission terminal; 17 is the main control chip; 171 is the reset pin; 172 is the chip power supply pin; and 18 is the external power supply. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0029] The directional terms mentioned in this utility model, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", "top" and "bottom", are only for reference to the orientation of the accompanying drawings. The directional terms used are for the purpose of explaining and understanding this utility model, and are not intended to limit this utility model.

[0030] The terms "first" and "second" in this utility model are used for descriptive purposes only and should not be construed as indicating or implying relative importance, nor as a restriction on the order of events.

[0031] In the diagram, units with similar structures are represented by the same labels.

[0032] Please refer to Figure 1 This utility model provides a camera driving circuit 10, which includes a main control chip 17, a device module 15, a microphone module 16, a voltage conversion module 11, a microphone power supply module 12, a device power supply module 13, and a chip power supply module 14. The device module 15 is used to implement various functions of the camera device, the microphone module 16 is used to transmit audio information through a microphone, and the main control chip 17 connects to the device module 15 and the microphone module 16, enabling data interaction with each module. The voltage conversion module 11 performs voltage conversion on the voltage output from the external power supply 18, generating a first voltage. The external power supply 18 voltage is 12V, and the first voltage is 5V.

[0033] Please refer to Figure 1 The microphone power supply module 12 includes a microphone power supply input terminal 121, a microphone power supply output terminal 122, and a microphone power supply enable terminal 123. The microphone power supply input terminal 121 and the microphone power supply enable terminal 123 are connected to the voltage conversion module 11. Under the enable action of a first voltage, the microphone power supply module 12 can perform a voltage conversion operation on the first voltage. The microphone power supply module 12 can generate a microphone power supply voltage, and the microphone power supply output terminal 122 can output the microphone power supply voltage. The microphone power supply voltage can power the microphone module 16, and the microphone power supply voltage is 1.8V.

[0034] Please refer to Figure 1The device power supply module 13 includes a device power supply input terminal 131, a device power supply output terminal 132, and a device power supply enable terminal 133. The device power supply input terminal 131 is connected to the voltage conversion module 11, and the device power supply enable terminal 133 is connected to the microphone power supply output terminal 122. Under the enable function of the microphone power supply voltage, the device power supply module 13 performs a voltage conversion operation on the first voltage, the device module 15 generates the device power supply voltage, and the device power supply output terminal 132 outputs the device power supply voltage. The device power supply voltage can power the device module 15, and the device power supply voltage is 3.3V.

[0035] Please refer to Figure 1 The chip power supply module 14 includes a chip power supply input terminal 141, a chip power supply output terminal 142, and a chip power supply enable terminal 143. The chip power supply input terminal 141 is connected to the voltage conversion module 11, and the chip power supply enable terminal 143 is connected to the device power supply output terminal 132. Under the enable function of the device power supply voltage, the chip power supply module 14 can perform a voltage conversion operation on the first voltage, generate a chip power supply voltage, and output the chip power supply voltage from the chip power supply output terminal 142. The chip power supply voltage, which is 0.94V, can power the main control chip 17.

[0036] Please refer to Figure 1 and Figure 8 The main control chip 17 includes a reset pin 171. When the main control chip 17 receives the chip power supply voltage, the reset pin 171 is in normal working condition, thus ensuring the main control chip 17 is in normal working condition, allowing the user to reset the camera device. Resetting the camera when some modules are not fully started, or when some modules are starting up, can easily lead to camera malfunctions. However, if all modules of the circuit have started up completely, they are all in a stable working state. Then, resetting the camera device can effectively reduce the failure rate of the camera device.

[0037] Please refer to Figures 2 to 9 The following is a detailed description of the specific circuit structure of the camera driver circuit 10. Please refer to Figure 2The voltage conversion module 11 includes a first voltage conversion chip U40, a first feedback resistor R154, and a second feedback resistor R155. The first voltage conversion chip U40 is model SY81103EABT. The first voltage conversion chip U40 includes a first input pin IN, a first output pin LX, and a first feedback pin FB. The first input pin IN is connected to an external power supply 18. One end of the first feedback resistor R154 is connected to the first output pin LX, and the other end of the first feedback resistor R154 is connected to the first feedback pin FB. One end of the second feedback resistor R155 is connected to the first feedback pin FB, and the other end of the second feedback resistor R154 is grounded. The voltage conversion module 11 also includes a filter capacitor C2. One end of the filter capacitor C2 is connected to the external power supply 18 and the first input pin IN, and the other end of the filter capacitor C2 is grounded. The filter capacitor C2 can filter the voltage of the external power supply 18. The voltage conversion module 11 also includes a transient voltage suppression diode D58, which is connected in parallel with the filter capacitor C2. The transient voltage suppression diode D58 can provide surge and overvoltage protection for the first voltage conversion chip U40.

[0038] Please refer to Figure 2 The first input pin IN can accept the voltage from an external power supply 18. The first voltage conversion chip U40 performs voltage conversion on the external power supply 18, generating a first voltage. The first output pin LX is used to output the first voltage. The first feedback resistor R154 and the second feedback resistor R155 divide the first voltage to generate a first feedback voltage. The first voltage conversion chip U40 adjusts the first voltage based on this first feedback voltage. According to the formula V1 = 0.6 * (1 + r154 / r155), where V1 is the voltage value of the first voltage, r154 is the resistance value of the first feedback resistor R154, and r155 is the resistance value of the second feedback resistor R155. In a preferred embodiment, the resistance value of the first feedback resistor R154 can be 154KΩ, and the resistance value of the second feedback resistor R155 can be 21KΩ. Therefore, the voltage value of the first voltage is 5V.

[0039] Please refer to Figure 3The microphone power input terminal 121 and the microphone power enable terminal 123 are connected to the first output pin. The microphone power supply module 12 includes a second voltage conversion chip U41, a third feedback resistor R356, and a fourth feedback resistor R355. The second voltage conversion chip U41 is model LN1172A. The second voltage conversion chip U41 includes a second input pin VIN, a second output pin LX, a first enable pin EN, and a second feedback pin FB. The second input pin VIN is connected to the microphone power input terminal 121, and the first enable pin EN is connected to the microphone power enable terminal 123. One end of the third feedback resistor R356 is connected to the second output pin LX, and the other end of the third feedback resistor R356 is connected to the second feedback pin FB. One end of the fourth feedback resistor R355 is connected to the second feedback pin FB, and the other end of the fourth feedback resistor R355 is grounded. The second output pin LX is connected to the microphone power output terminal 122.

[0040] Please refer to Figure 3 The second input pin VIN and the first enable pin EN are used to input the first voltage. Under the enable function of the first voltage, the second voltage conversion chip U41 can perform voltage conversion on the first voltage. The second voltage conversion chip U41 generates the microphone power supply voltage, and the second output pin LX can output the microphone power supply voltage. The third feedback resistor R356 and the fourth feedback resistor R355 can perform a voltage divider operation on the microphone power supply voltage to generate a second feedback voltage. The second voltage conversion chip U41 adjusts the microphone power supply voltage based on the second feedback voltage. According to the formula V2=0.6*(1+r365 / r355), where V2 is the voltage value of the microphone power supply voltage, r365 is the resistance value of the first feedback resistor R365, and r355 is the resistance value of the second feedback resistor R355. In a preferred embodiment, the resistance value of the first feedback resistor R365 can be 300KΩ, and the resistance value of the second feedback resistor R355 can be 150KΩ. Therefore, the voltage value of the first voltage is 1.8V.

[0041] Please refer to Figure 6 The microphone module 16 includes a microphone 1611 and a microphone signal transmission terminal 1612, and a microphone power supply output terminal 122 is connected to the microphone 1611. Thus, the microphone power supply output terminal 122 can output the microphone power supply voltage to the microphone 1611, which can power the microphone 1611. Therefore, the microphone 1611 can generate a microphone signal based on audio information, and the microphone signal transmission terminal 1612 is used to transmit the microphone signal to the main control chip 17.

[0042] Please refer to Figure 4The device power supply input terminal 131 is connected to the first output pin, and the device power supply enable terminal 133 is connected to the second output pin. The device power supply module 13 includes a third voltage conversion chip U42, a fifth feedback resistor R21, and a sixth feedback resistor R24. The third voltage conversion chip U42 is model LN1172A. The third voltage conversion chip U42 includes a third input pin VIN, a third output pin LX, a second enable pin EN, and a third feedback pin FB. The third input pin VIN is connected to the device power supply input terminal 131, and the second enable pin EN is connected to the device power supply enable terminal 133. One end of the fifth feedback resistor R21 is connected to the third output pin LX, and the other end of the fifth feedback resistor R21 is connected to the third feedback pin FB. One end of the sixth feedback resistor R24 ​​is connected to the third feedback pin FB, and the other end of the sixth feedback resistor R24 ​​is grounded. The third output pin LX is connected to the device power supply output terminal 132.

[0043] Please refer to Figure 4 The third input pin VIN can input the first voltage, and the second enable pin EN can input the microphone power supply voltage. Driven by the microphone power supply voltage, the third voltage conversion chip U42 can perform voltage conversion on the first voltage. The third voltage conversion chip U42 can generate the device power supply voltage, and the third output pin LX is used to output the device power supply voltage. The fifth feedback resistor R21 and the sixth feedback resistor R24 ​​can perform voltage division on the device power supply voltage to generate the third feedback voltage. The third voltage conversion chip U42 can adjust the device power supply voltage based on the third feedback voltage. According to the formula V3=0.6*(1+r21 / r24), where V3 is the voltage value of the device power supply voltage, r21 is the resistance value of the fifth feedback resistor R21, and r24 is the resistance value of the sixth feedback resistor R24. In a preferred embodiment, the resistance value of the fifth feedback resistor R21 can be 153KΩ, and the resistance value of the sixth feedback resistor R24 ​​can be 34KΩ. Therefore, the voltage value of the device power supply voltage is 3.3V.

[0044] Please refer to Figure 7 The device module 15 includes a WIFI unit 151. The WIFI unit 151 includes a WIFI chip U3, model number BL-M3873XU1, which includes a WIFI chip power supply pin VCC. The WIFI chip power supply pin VCC is connected to the device power supply output terminal 132, allowing the device power supply output terminal 132 to transmit the device power supply voltage to the WIFI chip power supply pin VCC, thus powering the WIFI chip U3. The WIFI chip U3 also includes a DM pin, a DP pin, and an ANT pin. The DM and DP pins are connected to the main control chip 17, and the ANT pin is connected to an antenna. Therefore, the main control chip 17 can communicate bidirectionally with external devices through the WIFI chip U3.

[0045] Please refer to Figure 9 The device module 15 also includes a storage unit 152. Storage unit 152 includes a storage chip U1, which has DAT0, DAT1, CLK, CD, WP, and CMD pins. The DAT0, DAT2, DAT3, CLK, and CMD pins are all connected to the main control chip 17, and the DAT1 pin is connected to an SD card. Therefore, the main control chip 17 can transmit image information from the camera device to the SD card, which can then store the image information.

[0046] Please refer to Figure 5 The chip power supply input terminal 141 is connected to the first output pin LX, and the chip power supply enable terminal 143 is connected to the third output pin LX. The chip power supply module 14 includes a fourth voltage conversion chip U43, a seventh feedback resistor R22, and an eighth feedback resistor R27. The fourth voltage conversion chip U43 is model LN1172A. The fourth voltage conversion chip U43 includes a fourth input pin VIN, a fourth output pin LX, a third enable pin EN, and a fourth feedback pin FB. The fourth input pin VIN is connected to the chip power supply input terminal 141, and the third enable pin EN is connected to the chip power supply enable terminal 143. One end of the seventh feedback resistor R22 is connected to the fourth output pin LX, and the other end of the seventh feedback resistor R22 is connected to the fourth feedback pin FB. One end of the eighth feedback resistor R27 is connected to the fourth feedback pin FB, and the other end of the eighth feedback resistor R27 is grounded. The fourth output pin LX is connected to the chip power supply output terminal 142.

[0047] Please refer to Figure 5 and Figure 8The fourth input pin VIN can receive the first voltage, and the third enable pin EN can receive the device supply voltage. Driven by the device supply voltage, the fourth voltage conversion chip U43 performs a voltage conversion operation on the first voltage. The fourth voltage conversion chip U43 can generate the chip supply voltage, and the fourth output pin LX can output the chip supply voltage. The seventh feedback resistor R22 and the eighth feedback resistor R27 can perform a voltage divider operation on the chip supply voltage to generate the fourth feedback voltage. The fourth voltage conversion chip U43 adjusts the chip supply voltage based on the fourth feedback voltage. According to the formula V4=0.6*(1+r22 / r27), where V4 is the voltage value of the chip supply voltage, r22 is the resistance value of the seventh feedback resistor R22, and r27 is the resistance value of the eighth feedback resistor R27. In a preferred embodiment, the resistance value of the seventh feedback resistor R22 can be 56KΩ, and the resistance value of the eighth feedback resistor R27 can be 100KΩ. Therefore, the voltage value of the chip supply voltage is 0.94V. The main control chip 17 includes a chip supply pin 172. The chip power supply pin 172 is connected to the chip power supply output terminal 142, so that the chip power supply output terminal 142 can transmit the chip power supply voltage to the chip power supply pin 172, and then the chip power supply voltage can power the main control chip 17.

[0048] This utility model also provides a camera device, which internally includes a camera driving circuit 10. The device structure of this camera device is similar to that of the camera driving circuit 10; please refer to the description of the device structure of the camera driving circuit 10 for details. The working principle of this camera device is similar to that of the camera driving circuit 10; please refer to the description of the working principle of the camera driving circuit 10 for details.

[0049] The working principle of this utility model is as follows: When the camera driving circuit 10 is working, firstly, the external power supply 18 outputs a 12V external power supply voltage. Since a filter capacitor C2 is connected in parallel between the external power supply 18 and the first input pin IN of the first voltage conversion chip U40, the filter capacitor C2 can filter the external power supply voltage. Moreover, because the voltage conversion module 11 is equipped with a transient voltage suppression diode D58, the transient voltage suppression diode D58 can provide surge and overvoltage protection for the first voltage conversion chip U40. Subsequently, the first input pin IN of the first voltage conversion chip U40 can input the external power supply voltage. The first voltage conversion chip U40 can perform voltage conversion operation on the external power supply voltage, and the first voltage conversion chip U40 can generate a first voltage. The first output pin LX can output the first voltage, which is 5V. Then, the microphone power supply input terminal 121 and the microphone power supply enable terminal 123 can input the first voltage. Because the second input pin VIN is connected to the microphone power supply input terminal 121, and the first enable pin EN is connected to the microphone power supply enable terminal 123, the second input pin VIN and the first enable pin EN can input a first voltage. Under the enable action of the first voltage, the second voltage conversion chip U41 can perform voltage conversion operation on the first voltage, and the second voltage conversion chip U41 generates the microphone power supply voltage. The second output pin LX can output the microphone power supply voltage, which is 1.8V, and this microphone power supply voltage can power the microphone module 16.

[0050] The device power supply input terminal 131 is connected to the first output pin LX, and the device power supply enable terminal 133 is connected to the second output pin LX. Furthermore, the third input pin VIN is connected to the device power supply input terminal 131, and the second enable pin EN is connected to the device power supply enable terminal 133. Therefore, the third input pin VIN can input a first voltage, and the second enable pin EN can input a microphone power supply voltage. Driven by the microphone power supply voltage, the third voltage conversion chip U42 can perform voltage conversion on the first voltage, generating the device power supply voltage. The third output pin LX outputs the device power supply voltage, which is 3.3V, and this device power supply voltage can power the device module 15.

[0051] The chip power supply input terminal 141 is connected to the first output pin LX, and the chip power supply enable terminal 143 is connected to the third output pin LX. Furthermore, the fourth input pin VIN is connected to the chip power supply input terminal 141, and the third enable pin EN is connected to the chip power supply enable terminal 143. Therefore, the fourth input pin VIN can input a first voltage, and the third enable pin EN can receive the device power supply voltage. Driven by the device power supply voltage, the fourth voltage conversion chip U43 can perform a voltage conversion operation on the first voltage, generating the chip power supply voltage. The fourth output pin LX can output the chip power supply voltage, which is 0.94V. The main control chip 17 can receive the chip power supply voltage through the chip power supply pin 172, which can power the main control chip 17. At this time, the reset pin 171 is in normal working condition, thus ensuring the main control chip 17 is in normal working condition. Subsequently, the user can perform a reset operation on the camera device.

[0052] This invention provides a camera driving circuit, which includes a main control chip, a device module, a microphone module, a voltage conversion module, a microphone power supply module, a device power supply module, and a chip power supply module. The voltage conversion module converts the external power supply voltage to generate a first voltage. When the first voltage is enabled, the microphone power supply module converts the first voltage to generate a microphone power supply voltage, which powers the microphone module. When the microphone power supply voltage is enabled, the device power supply module converts the first voltage to generate a device power supply voltage, which powers the device module. When the device power supply voltage is enabled, the chip power supply module converts the first voltage to generate a chip power supply voltage, which powers the main control chip. When the main control chip receives the chip power supply voltage, its reset pin is in normal operating condition, thus ensuring the main control chip is in normal operating condition.

[0053] Therefore, this camera driver circuit can sequentially power each module of the circuit. Only after each module has started up does the camera driver circuit power the main control chip, ensuring the reset pin functions correctly. At this point, the user can reset the camera device. This effectively avoids the problem of resetting the camera before some modules have fully started, which could lead to camera malfunctions. The power supply sequence for each module in this camera driver circuit is reasonable, ensuring the normal operation of the entire system. Furthermore, the camera driver circuit first converts the 12V external power supply voltage to a 5V initial voltage through a voltage conversion module, and then converts the initial voltage to a voltage below 5V through other power supply modules, thus helping to ensure the accuracy and stability of the output voltage. This camera driver circuit effectively solves the technical problem of existing cameras being prone to malfunctions.

[0054] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A camera driving circuit, characterized in that, It includes, The device module is used to realize various functions of the camera device; A microphone module is used to transmit audio information through a microphone; The main control chip connects the device module and the microphone module and is used to interact with each module for data exchange. A voltage conversion module is used to perform voltage conversion on the external power supply voltage output from an external power source to generate a first voltage, wherein the external power supply voltage is 12V and the first voltage is 5V. A microphone power supply module includes a microphone power supply input terminal, a microphone power supply output terminal, and a microphone power supply enable terminal. The microphone power supply input terminal and the microphone power supply enable terminal are connected to the voltage conversion module. Under the enable action of a first voltage, the microphone power supply module is used to perform a voltage conversion operation on the first voltage to generate a microphone power supply voltage. The microphone power supply output terminal is used to output the microphone power supply voltage, which is used to power the microphone module. The microphone power supply voltage is 1.8V. The device power supply module includes a device power supply input terminal, a device power supply output terminal, and a device power supply enable terminal. The device power supply input terminal is connected to the voltage conversion module, and the device power supply enable terminal is connected to the microphone power supply output terminal. Under the enable action of the microphone power supply voltage, the device power supply module is used to perform a voltage conversion operation on the first voltage to generate a device power supply voltage. The device power supply output terminal is used to output the device power supply voltage, which is used to power the device module. The device power supply voltage is 3.3V. A chip power supply module includes a chip power supply input terminal, a chip power supply output terminal, and a chip power supply enable terminal. The chip power supply input terminal is connected to the voltage conversion module, and the chip power supply enable terminal is connected to the device power supply output terminal. Under the enable action of the device power supply voltage, the chip power supply module is used to perform a voltage conversion operation on the first voltage to generate a chip power supply voltage. The chip power supply output terminal is used to output the chip power supply voltage, which is used to power the main control chip. The chip power supply voltage is 0.94V. The main control chip includes a reset pin. When the main control chip receives the chip power supply voltage, the reset pin is in normal working condition, thereby enabling the main control chip to be in normal working condition.

2. The camera driving circuit according to claim 1, characterized in that, The voltage conversion module includes a first voltage conversion chip, a first feedback resistor, and a second feedback resistor. The first voltage conversion chip includes a first input pin, a first output pin, and a first feedback pin. The first input pin is connected to the external power supply. One end of the first feedback resistor is connected to the first output pin, and the other end of the first feedback resistor is connected to the first feedback pin. One end of the second feedback resistor is connected to the first feedback pin, and the other end of the second feedback resistor is grounded. The first input pin is used to input the external power supply voltage, the first voltage conversion chip is used to perform voltage conversion operation on the external power supply voltage to generate a first voltage, the first output pin is used to output the first voltage, the first feedback resistor and the second feedback resistor are used to perform voltage division operation on the first voltage to generate a first feedback voltage, and the first voltage conversion chip adjusts the first voltage based on the first feedback voltage.

3. The camera driving circuit according to claim 2, characterized in that, The microphone power input terminal and the microphone power enable terminal are connected to the first output pin. The microphone power supply module includes a second voltage conversion chip, a third feedback resistor, and a fourth feedback resistor. The second voltage conversion chip includes a second input pin, a second output pin, a first enable pin, and a second feedback pin. The second input pin is connected to the microphone power input terminal, and the first enable pin is connected to the microphone power enable terminal. One end of the third feedback resistor is connected to the second output pin, and the other end of the third feedback resistor is connected to the second feedback pin. One end of the fourth feedback resistor is connected to the second feedback pin, and the other end of the fourth feedback resistor is grounded. The second output pin is connected to the microphone power output terminal. The second input pin and the first enable pin are used to input the first voltage. The second voltage conversion chip is used to perform a voltage conversion operation on the first voltage under the enable action of the first voltage to generate a microphone power supply voltage. The second output pin is used to output the microphone power supply voltage. The third feedback resistor and the fourth feedback resistor are used to perform a voltage divider operation on the microphone power supply voltage to generate a second feedback voltage. The second voltage conversion chip adjusts the microphone power supply voltage based on the second feedback voltage.

4. The camera driving circuit according to claim 3, characterized in that, The device power supply input terminal is connected to the first output pin, and the device power supply enable terminal is connected to the second output pin. The device power supply module includes a third voltage conversion chip, a fifth feedback resistor, and a sixth feedback resistor. The third voltage conversion chip includes a third input pin, a third output pin, a second enable pin, and a third feedback pin. The third input pin is connected to the device power supply input terminal, and the second enable pin is connected to the device power supply enable terminal. One end of the fifth feedback resistor is connected to the third output pin, and the other end of the fifth feedback resistor is connected to the third feedback pin. One end of the sixth feedback resistor is connected to the third feedback pin, and the other end of the sixth feedback resistor is grounded. The third output pin is connected to the device power supply output terminal. The third input pin is used to input the first voltage, the second enable pin is used to input the microphone power supply voltage, the third voltage conversion chip is used to perform a voltage conversion operation on the first voltage under the drive of the microphone power supply voltage to generate a device power supply voltage, the third output pin is used to output the device power supply voltage, the fifth feedback resistor and the sixth feedback resistor are used to perform a voltage divider operation on the device power supply voltage to generate a third feedback voltage, and the third voltage conversion chip adjusts the device power supply voltage based on the third feedback voltage.

5. The camera driving circuit according to claim 4, characterized in that, The chip power supply input terminal is connected to the first output pin, and the chip power supply enable terminal is connected to the third output pin. The chip power supply module includes a fourth voltage conversion chip, a seventh feedback resistor, and an eighth feedback resistor. The fourth voltage conversion chip includes a fourth input pin, a fourth output pin, a third enable pin, and a fourth feedback pin. The fourth input pin is connected to the chip power supply input terminal, and the third enable pin is connected to the chip power supply enable terminal. One end of the seventh feedback resistor is connected to the fourth output pin, and the other end of the seventh feedback resistor is connected to the fourth feedback pin. One end of the eighth feedback resistor is connected to the fourth feedback pin, and the other end of the eighth feedback resistor is grounded. The fourth output pin is connected to the chip power supply output terminal. The fourth input pin is used to input the first voltage, the third enable pin is used to receive the device power supply voltage, the fourth voltage conversion chip is used to perform a voltage conversion operation on the first voltage under the drive of the device power supply voltage to generate a chip power supply voltage, the fourth output pin is used to output the chip power supply voltage, the seventh feedback resistor and the eighth feedback resistor are used to perform a voltage divider operation on the chip power supply voltage to generate a fourth feedback voltage, and the fourth voltage conversion chip adjusts the chip power supply voltage based on the fourth feedback voltage.

6. The camera driving circuit according to claim 2, characterized in that, The first voltage conversion chip is model number SY81103EABT.

7. The camera driving circuit according to claim 5, characterized in that, The model numbers of the second voltage conversion chip, the third voltage conversion chip, and the fourth voltage conversion chip are all LN1172A.

8. The camera driving circuit according to claim 2, characterized in that, The voltage conversion module also includes a filter capacitor. One end of the filter capacitor is connected to the external power supply and the first input pin, and the other end of the filter capacitor is grounded. The filter capacitor is used to filter the external power supply voltage.

9. The camera driving circuit according to claim 8, characterized in that, The voltage conversion module also includes a transient voltage suppression diode, which is connected in parallel with the filter capacitor. The transient voltage suppression diode is used to provide surge and overvoltage protection for the first voltage conversion chip.

10. A camera device, characterized in that, It includes the camera driving circuit as described in any one of claims 1-9.

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