Shutter driving circuit, shutter system and camera system

Abstract

The utility model discloses a driving circuit of a shutter, a shutter system and a camera system, and relates to the circuit control field, a logic control module receives a first control signal and a second control signal which are opposite, and when a first voltage is greater than a second voltage, current flows in from a first end of the shutter and flows out from a second end of the shutter; the first voltage output module and the second voltage output module provide forward voltage for the shutter, so that forward power supply for the shutter is realized, and the shutter is normally opened; when the first voltage is smaller than the second voltage, the current flows in from the second end of the shutter and flows out from the first end of the shutter, the first voltage output module and the second voltage output module provide reverse voltage for the shutter, reverse power supply of the shutter is achieved, and the shutter is closed; therefore, the action process of the shutter is controlled. The whole circuit is simple in structure, low in cost, stable in performance, small in power consumption, small in size and more suitable for development of a miniaturized camera system.

Description

Technical Field

[0001] The utility model relates to the field of circuit control, in particular to a driving circuit of a shutter, a shutter system and a camera system. Background Technique

[0002] As an important component module of a camera, the shutter plays an important role in the image uniform reference surface, protects the detector in the camera from being burned by sunlight, and the action control of the shutter is an important working process for the camera to take pictures, which will seriously affect parameters such as the uniformity and brightness of the final image generated by the entire camera. How to implement a simple driving circuit for controlling the shutter action has become an urgent technical problem to be solved. Content of the Utility Model

[0003] The purpose of the utility model is to provide a driving circuit of a shutter, a shutter system and a camera system. When the first voltage is greater than the second voltage, the first voltage output module and the second voltage output module provide a positive voltage for the shutter to control the shutter to open; when the first voltage is less than the second voltage, the first voltage output module and the second voltage output module provide a reverse voltage for the shutter to control the shutter to close; thus realizing the control of the shutter action process. The whole circuit structure is simple, the cost is low, the performance is stable, the power consumption is small, the size is small, and it is more suitable for the development of miniaturized camera systems.

[0004] To solve the above technical problems, the utility model provides a driving circuit of a shutter, including:

[0005] A logic control module, with the first input terminal receiving a first control signal and the second input terminal receiving a second control signal;

[0006] A first voltage output module, with the input terminal connected to the first output terminal of the logic control module and the output terminal connected to the first end of the shutter, for outputting a first voltage corresponding to the first control signal under the control of the logic control module;

[0007] A second voltage output module, with the input terminal connected to the second output terminal of the logic control module and the output terminal connected to the second end of the shutter, for outputting a second voltage corresponding to the second control signal under the control of the logic control module; the first control signal and the second control signal are opposite.

[0008] Optionally, the logic control module includes a first logic circuit with the input terminal receiving the first control signal, a second logic circuit with the input terminal receiving the first control signal, a third logic circuit with the input terminal receiving the second control signal, and a fourth logic circuit with the input terminal receiving the second control signal; the first voltage output module includes a first switch and a second switch, and the second voltage output module includes a third switch and a fourth switch;

[0009] The control terminal of the first switch is connected to the output terminal of the first logic circuit, the control terminal of the second switch is connected to the output terminal of the second logic circuit, the control terminal of the third switch is connected to the output terminal of the third logic circuit, the control terminal of the fourth switch is connected to the output terminal of the fourth logic circuit. The first ends of the first switch and the third switch are both connected to the power supply. The first end of the shutter is respectively connected to the second end of the first switch and the first end of the second switch. The second end of the shutter is respectively connected to the second end of the third switch and the first end of the fourth switch. The second ends of the second switch and the fourth switch are both grounded;

[0010] The operating states of the first switch and the second switch are opposite, and the operating states of the third switch and the fourth switch are opposite; the first control signal and the second control signal are opposite.

[0011] Optionally, the first logic circuit is a first AND gate, the second logic circuit is a second AND gate, the third logic circuit is a third AND gate, and the fourth logic circuit is a fourth AND gate;

[0012] The first input terminal of the first AND gate receives the first control signal, the second input terminal is connected to the power supply, and the output terminal is connected to the control terminal of the first switch;

[0013] The first input terminal of the second AND gate receives the first control signal, the second input terminal is connected to the power supply, and the output terminal is connected to the control terminal of the second switch;

[0014] The first input terminal of the third AND gate receives the second control signal, the second input terminal is connected to the power supply, and the output terminal is connected to the control terminal of the third switch;

[0015] The first input terminal of the fourth AND gate receives the second control signal, the second input terminal is connected to the power supply, and the output terminal is connected to the control terminal of the fourth switch.

[0016] Optionally, it further includes:

[0017] A first current limiting module, the first end of which is respectively connected to the second input terminals of the first AND gate and the second AND gate;

[0018] A second current limiting module, the first end of which is respectively connected to the power supply, the second end of the first current limiting module, the first end of the first switch, and the first end of the third switch, and the second end of which is respectively connected to the second input terminals of the third AND gate and the fourth AND gate.

[0019] Optionally, it further includes:

[0020] The first noise reduction module, with its first end connected to the first control signal and its second end respectively connected to the first input end of the first AND gate and the first input end of the second AND gate;

[0021] The second noise reduction module, with its first end connected to the second control signal and its second end respectively connected to the first input end of the third AND gate and the first input end of the fourth AND gate.

[0022] Optionally, it further includes:

[0023] The pull-up module, with its first end respectively connected to the first input end of the third AND gate and the first input end of the fourth AND gate;

[0024] The pull-down module, with its first end respectively connected to the first input end of the first AND gate and the first input end of the second AND gate, and its second end grounded;

[0025] The energy storage device, with its input end connected to an external power supply and its output end connected to the second end of the pull-up module, and serving as a power supply, is respectively connected to the second input end of the first AND gate, the second input end of the second AND gate, the second input end of the third AND gate, the second input end of the fourth AND gate, the first end of the first switch, and the first end of the third switch, and is used to provide a power supply for the driving circuit of the shutter through the external power supply, and simultaneously store energy based on the external power supply.

[0026] Optionally, the energy storage device is a capacitor, with its first end connected to an external power supply and serving as the output end of the energy storage device, and its second end grounded.

[0027] Optionally, it further includes:

[0028] The one-way conduction module, with its positive pole connected to an external power supply and its negative pole connected to the input end of the energy storage device.

[0029] To solve the above technical problems, the present utility model further provides a shutter system, including a shutter and the driving circuit of the shutter as described above.

[0030] To solve the above technical problems, the present utility model further provides a camera system, including a detector and the shutter system as described above.

[0031] The present utility model provides a driving circuit for a shutter, which includes a logic control module, a first voltage output module, and a second voltage output module. The logic control module receives opposite first control signal and second control signal. When the first voltage is greater than the second voltage, current flows into the shutter from the first end and flows out from the second end. The first voltage output module and the second voltage output module provide a positive voltage for the shutter to achieve positive power supply to the shutter, and the shutter is normally opened. When the first voltage is less than the second voltage, current flows into the shutter from the second end and flows out from the first end. The first voltage output module and the second voltage output module provide a negative voltage for the shutter to achieve reverse power supply to the shutter, and the shutter is closed. Thus, the control of the shutter operation process is realized. The whole circuit structure is simple, with low cost, stable performance, low power consumption, and small size, and is more suitable for the development of miniaturized camera systems.

[0032] The present utility model also provides a shutter system and a camera system, which have the same beneficial effects as the above-mentioned driving circuit for the shutter. Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for the prior art and the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0034] Figure 1 It is a schematic structural diagram of a driving circuit for a shutter provided by the present utility model;

[0035] Figure 2 It is a schematic structural diagram of a driving circuit for a shutter provided by the first embodiment of the present utility model;

[0036] Figure 3 It is a schematic structural diagram of a driving circuit for a shutter provided by the second embodiment of the present utility model;

[0037] Figure 4 It is a schematic structural diagram of a power-off protection circuit for a shutter provided by the present utility model. Detailed Embodiments

[0038] The core of the present utility model is to provide a driving circuit for a shutter, a shutter system, and a camera system. When the first voltage is greater than the second voltage, the first voltage output module and the second voltage output module provide a positive voltage for the shutter to control the opening of the shutter; when the first voltage is less than the second voltage, the first voltage output module and the second voltage output module provide a reverse voltage for the shutter to control the closing of the shutter; thereby realizing the control of the shutter operation process. The entire circuit structure is simple, with low cost, stable performance, low power consumption, and small size, which is more suitable for the development of miniaturized camera systems.

[0039] In order to make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0040] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a driving circuit for a shutter provided by the present utility model; IC-GPIO1 represents the first control signal, and IC-GPIO2 represents the second control signal. To solve the above technical problems, the present utility model provides a driving circuit for a shutter, including:

[0041] A logic control module 11, with the first input terminal connected to the first control signal and the second input terminal connected to the second control signal;

[0042] A first voltage output module 21, with the input terminal connected to the first output terminal of the logic control module 11 and the output terminal connected to the first end of the shutter, for outputting a first voltage corresponding to the first control signal under the control of the logic control module 11;

[0043] A second voltage output module 22, with the input terminal connected to the second output terminal of the logic control module 11 and the output terminal connected to the second end of the shutter, for outputting a second voltage corresponding to the second control signal under the control of the logic control module 11; the first control signal and the second control signal are opposite.

[0044] It can be understood that when the camera system is powered on and working, the main control chip of the camera will drive and output corresponding first control signal and second control signal to the logic control module 11 according to the specific operations of the user. The logic control module 11 will analyze and process them and output corresponding drive signals. The first voltage output module 21 will output a first voltage under the action of the drive signal corresponding to the first control signal, and the second voltage output module 22 will output a second voltage under the action of the drive signal corresponding to the second control signal. The first control signal and the second control signal are opposite to each other. Therefore, the first voltage and the second voltage will also change with the changes of the two control signals. When the first voltage is greater than the second voltage, the current flows into the shutter from the first end and flows out from the second end of the shutter, realizing the forward power supply to the shutter and the shutter is normally opened. When the first voltage is less than the second voltage, the current flows into the shutter from the second end and flows out from the first end of the shutter, realizing the reverse power supply to the shutter and the shutter is closed.

[0045] It is not difficult to understand that taking the control signal as a level signal as an example, when the first control signal is a high-level signal and the second control signal is a low-level signal, the first voltage is greater than the second voltage. When the first control signal is a low-level signal and the second control signal is a high-level signal, the first voltage is less than the second voltage. The specific values of the first voltage and the second voltage and the voltage difference between the two are not particularly limited in this application and can be set and adjusted according to the power supply requirements of the shutter in actual applications.

[0046] The utility model provides a driving circuit for a shutter. When the first voltage is greater than the second voltage, the current flows into the shutter from the first end and flows out from the second end of the shutter, providing a forward voltage for the shutter, realizing the forward power supply to the shutter, and the shutter is normally opened. When the first voltage is less than the second voltage, the current flows into the shutter from the second end and flows out from the first end of the shutter, providing a negative voltage for the shutter, realizing the reverse power supply to the shutter, and the shutter is closed. Thus, the control of the shutter action process is realized. The whole circuit structure is simple, the cost is low, the performance is stable, the power consumption is small, and the size is small, which is more suitable for the development of miniaturized camera systems.

[0047] Based on the above embodiments:

[0048] Please refer to Figure 2 , Figure 2Schematic diagram of a driving circuit of a shutter provided for the first embodiment of the present utility model; As an optional embodiment, the logic control module includes a first logic circuit with a first control signal input at the input end, a second logic circuit with a first control signal input at the input end, a third logic circuit with a second control signal input at the input end, and a fourth logic circuit with a second control signal input at the input end; The first voltage output module includes a first switch and a second switch, and the second voltage output module includes a third switch and a fourth switch; The first switch Q1, the second switch Q2, the third switch Q3, the fourth switch Q4, the first logic circuit 1 with a first control signal input at the input end, and the second logic circuit 2, the third logic circuit 3 with a second control signal input at the input end, and the fourth logic circuit 4;

[0049] The control end of the first switch Q1 is connected to the output end of the first logic circuit 1, the control end of the second switch Q2 is connected to the output end of the second logic circuit 2, the control end of the third switch Q3 is connected to the output end of the third logic circuit 3, the control end of the fourth switch Q4 is connected to the output end of the fourth logic circuit 4, the first ends of the first switch Q1 and the third switch Q3 are both connected to the power supply VM, the first end of the shutter is respectively connected to the second end of the first switch Q1 and the first end of the second switch Q2, the second end of the shutter is respectively connected to the second end of the third switch Q3 and the first end of the fourth switch Q4, and the second ends of the second switch Q2 and the fourth switch Q4 are both grounded;

[0050] The operating states of the first switch Q1 and the second switch Q2 are opposite, and the operating states of the third switch Q3 and the fourth switch Q4 are opposite; The first control signal and the second control signal are opposite.

[0051] It can be understood that when the camera system is powered on and working, the four logic circuits will also be powered on and working simultaneously to ensure the same timing of the four logic circuits. At this time, the main control chip of the camera will drive and output corresponding control signals to the four logic circuits according to the specific operations of the user. After normal logical operations by the four logic circuits, the logic circuits will output corresponding level signals to the corresponding switches, thereby turning on the simple bridge formed by the four switches, and controlling the normal opening and closing of the shutter by controlling the four switches in different operating states.

[0052] Specifically, the power supply VM supplies power to the shutter through the first end and the second end of the shutter. On the one hand, the power supply VM can be input to the first end of the shutter and output from the second end of the shutter. On the other hand, the power supply VM can be input to the second end of the shutter and output from the first end of the shutter, thus realizing two power supply processes with different directions, corresponding to the two states of the shutter opening and closing respectively, and realizing the control of the two states of the shutter. For example, when the first switch Q1 is turned on under the action of the first control signal, the second switch Q2 will be turned off under the action of the first control signal, the third switch Q3 will be turned off under the action of the second control signal, and the fourth switch Q4 will be turned on under the action of the second control signal. At this time, the shutter will be opened under the action of the turned-on first switch Q1 and fourth switch Q4; conversely, when the first switch Q1 is turned off under the action of the first control signal, the second switch Q2 will be turned on under the action of the first control signal, the third switch Q3 will be turned on under the action of the second control signal, and the fourth switch Q4 will be turned off under the action of the second control signal. At this time, the shutter will be closed under the action of the turned-on second switch Q2 and third switch Q3. Therefore, the main control chip can output opposite first control signals and second control signals according to the user's operation to realize the control process of the two action states of the shutter.

[0053] It should be noted that the specific types and implementation methods of the first switch Q1, the second switch Q2, the third switch Q3, the fourth switch Q4, the first logic circuit 1, the second logic circuit 2, the third logic circuit 3, and the fourth logic circuit 4 are not particularly limited in this application. The first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 can be implemented by controllable switches such as MOS transistors (Metal-Oxide-Semiconductor Field-Effect Transistors). At the same time, it is necessary to consider that the working states of the first switch Q1 and the second switch Q2 are opposite, and the working states of the third switch Q3 and the fourth switch Q4 are opposite when selecting the switch type. For example, when the first switch Q1 is implemented by a P-type MOS transistor, the second switch Q2 needs to be implemented by an N-type MOS transistor accordingly, the third switch Q3 needs to be implemented by a P-type MOS transistor accordingly, and the fourth switch Q4 needs to be implemented by an N-type MOS transistor accordingly, so as to form a P-N mos bridge to realize the drive control of the shutter. The first logic circuit 1, the second logic circuit 2, the third logic circuit 3, and the fourth logic circuit 4 can be implemented by logic gates or built logic circuits. The specific generation methods and implementation methods of the first control signal and the second control signal are not particularly limited in this application and can be realized by simple level signals and other methods.

[0054] It is not difficult to understand that currently, the driving circuits for shutters are directly implemented by reusing high-current driving devices designed for motors. Most of the devices used are industrial-grade devices, which are large in size, high in power consumption, and expensive in cost. However, in the driving circuit of the shutter provided in this application, each device can be directly implemented by using automotive-grade devices. The driving current of the entire driving circuit during operation is small, and it can achieve a product design with a simple structure, wide voltage, small current, and low power consumption requirements. The circuit of the entire driving circuit is simple, the devices are easy to implement, the size is small, the cost is low, the structural logic is clear, and it can meet the driving function of the shutter based on automotive-grade devices. This application does not make special limitations on the specific setting methods of each device in the driving circuit, and can be set according to the specific type of automotive-grade device selected.

[0055] The present utility model provides a driving circuit for a shutter, which includes a first logic circuit 1, a second logic circuit 2, a third logic circuit 3, a fourth logic circuit 4, a first switch Q1, a second switch Q2, a third switch Q3, and a fourth switch Q4. The control circuit receives opposite first control signal and second control signal, and the operating states of the first switch Q1 and the second switch Q2 are opposite, and the operating states of the third switch Q3 and the fourth switch Q4 are opposite. When the first switch Q1 is turned off, the second switch Q2 is turned on, the third switch Q3 is turned on, and the fourth switch Q4 is turned off. The power supply VM supplies a positive voltage to the shutter through the turned-on second switch Q2 and third switch Q3 to control the shutter to open. When the first switch Q1 is turned on, the second switch Q2 is turned off, the third switch Q3 is turned off, and the fourth switch Q4 is turned on. The power supply VM supplies a reverse voltage to the shutter through the turned-on first switch Q1 and fourth switch Q4 to control the shutter to close. Thus, the control of the shutter operation process is realized. The entire circuit structure is simple, the cost is low, the performance is stable, the power consumption is small, the size is small, and it is more suitable for the development of miniaturized camera systems.

[0056] Please refer to Figure 3 , Figure 3 which is a schematic structural diagram of a driving circuit for a shutter provided in the second embodiment of the present utility model. As an optional embodiment, the first logic circuit 1 is a first AND gate U1, the second logic circuit 2 is a second AND gate U2, the third logic circuit 3 is a third AND gate U3, and the fourth logic circuit 4 is a fourth AND gate U4;

[0057] The first input terminal of the first AND gate U1 receives the first control signal, the second input terminal is connected to the power supply VM, and the output terminal is connected to the control terminal of the first switch Q1;

[0058] The first input terminal of the second AND gate U2 receives the first control signal, the second input terminal is connected to the power supply VM, and the output terminal is connected to the control terminal of the second switch Q2;

[0059] The first input terminal of the third AND gate U3 is connected to the second control signal, the second input terminal is connected to the power supply VM, and the output terminal is connected to the control terminal of the third switch Q3;

[0060] The first input terminal of the fourth AND gate U4 is connected to the second control signal, the second input terminal is connected to the power supply VM, and the output terminal is connected to the control terminal of the fourth switch Q4.

[0061] It is not difficult to understand that the four logic circuits can all be implemented by AND gates. The first input terminals of the respective AND gates are connected to the corresponding control signals, and the second input terminals of the four AND gates are all connected to the power supply VM. By means of the power supply VM, the recognition and detection of the first control signal or the second control signal are realized, so as to drive the corresponding switch through the AND gate function of two-way input and single-way output. During the entire driving process, the switch can be protected to avoid the simultaneous conduction of the first switch Q1 and the second switch Q2 or the third switch Q3 and the fourth switch Q4 on the same side, preventing abnormal situations such as power short circuit and circuit burnout. At the same time, by means of the opposite first control signal and second control signal, the simultaneous same-state actions of the first switch Q1 and the fourth switch Q4 or the second switch Q2 and the third switch Q3 are realized, so as to effectively drive the shutter. The specific types and implementation methods of the first AND gate U1, the second AND gate U2, the third AND gate U3, and the fourth AND gate U4 are not particularly limited in this application.

[0062] Specifically, the logic control functions of the first logic circuit 1, the second logic circuit 2, the third logic circuit 3, and the fourth logic circuit 4 can be effectively realized through AND gates, and the two working states of the shutter can be accurately driven through the opposite first control signal and second control signal; the structure of the entire circuit is simple and easy to implement, which is beneficial to the simple implementation of the driving circuit of the entire shutter and is more suitable for the development trend of miniaturized cameras.

[0063] As an alternative embodiment, it further includes:

[0064] The first current limiting module, the first end of which is respectively connected to the second input terminals of the first AND gate U1 and the second AND gate U2;

[0065] The second current limiting module, the first end of which is respectively connected to the power supply VM, the second end of the first current limiting module, the first end of the first switch Q1, and the first end of the third switch Q3, and the second end of which is respectively connected to the second input terminals of the third AND gate U3 and the fourth AND gate U4.

[0066] It is not difficult to understand that, in order to prevent the power supply VM from being directly connected to the second input terminal of the AND gate, a first current limiting module can also be added between the power supply VM and the second input terminals of the first AND gate U1 and the second AND gate U2, and a second current limiting module can be added between the power supply VM and the second input terminals of the third AND gate U3 and the fourth AND gate U4. Both the first current limiting module and the second current limiting module play a role in current limiting, preventing the direct connection between the excessive power supply VM and each AND gate, and protecting the circuit. The specific types and implementation methods of the first current limiting module and the second current limiting module are not particularly limited in this application. Specifically, a resistor can be used to implement it. As Figure 3 shown, the resistor R1 can be set as the first current limiting module, and the resistor R2 can be set as the second current limiting module.

[0067] Specifically, the first current limiting module and the second current limiting module can be further added to the driving circuit to protect the four AND gates, avoid damage to the AND gates, etc., realize the protection of the driving circuit, and ensure the normal operation of the driving circuit; the structure of the entire circuit is simple and easy to implement, which is beneficial to the simple implementation of the driving circuit of the entire shutter.

[0068] As an alternative embodiment, it further includes:

[0069] A first noise reduction module, with the first end connected to the first control signal, and the second end respectively connected to the first input terminals of the first AND gate U1 and the second AND gate U2;

[0070] A second noise reduction module, with the first end connected to the second control signal, and the second end respectively connected to the first input terminals of the third AND gate U3 and the fourth AND gate U4.

[0071] It is not difficult to understand that considering that the first control signal and the second control signal are usually output by the main control chip of the camera system, the driving circuit of the shutter needs to be connected to the corresponding pins of the main control chip to obtain the first control signal and the second control signal. As Figure 3 shown, the shutter driving circuit accesses the first control signal by connecting to the IC-GPIO1 pin of the main control chip, and the shutter driving circuit accesses the second control signal by connecting to the IC-GPIO2 pin of the main control chip. At this time, in order to further protect the input and output circuits corresponding to the pins and the external control signals, the first noise reduction module and the second noise reduction module can also be added to the driving circuit to ensure that the first control signal and the second control signal are not affected by external noise, and at the same time, the propagation interference of electromagnetic waves and signals can also be reduced. The specific types and implementation methods of the first noise reduction module and the second noise reduction module are not particularly limited in this application. Specifically, a series resistor can be used to implement it. As Figure 3As shown, it is achieved by connecting a resistor R3 in series between the IC-GPIO1 pin and the driving circuit, and connecting a resistor R5 in series between the IC-GPIO2 pin and the driving circuit. At this time, the resistor R3 and the resistor R5 can not only suppress noise and interference, but also play a role in current limiting to further protect the circuit.

[0072] Specifically, a first noise reduction module and a second noise reduction module can be further added to the driving circuit to ensure the accuracy and reliability of the first control signal and the second control signal input to the driving circuit. At the same time, it also avoids the direct connection of the first control signal and the second control signal to the corresponding AND gates, further protecting the circuit, ensuring the normal operation of the driving circuit, and improving the accuracy and reliability of the entire driving circuit working process; the structure of the entire circuit is simple and easy to implement, which is beneficial to the simple implementation of the driving circuit of the entire shutter.

[0073] Please refer to Figure 4 , Figure 4 which is a schematic structural diagram of a power-off protection circuit for a shutter provided by the present utility model. As an optional embodiment, it further includes:

[0074] A pull-up module, the first end of which is respectively connected to the first input end of the third AND gate U3 and the first input end of the fourth AND gate U4;

[0075] A pull-down module, the first end of which is respectively connected to the first input end of the first AND gate U1 and the first input end of the second AND gate U2, and the second end is grounded;

[0076] An energy storage device, the input end of which is connected to an external power supply Sys_V, and the output end is connected to the second end of the pull-up module and serves as a power supply VM, which is respectively connected to the second input end of the first AND gate U1, the second input end of the second AND gate U2, the second input end of the third AND gate U3, the second input end of the fourth AND gate U4, the first end of the first switch Q1 and the first end of the third switch Q3, and is used to provide the power supply VM for the driving circuit of the shutter through the external power supply Sys_V, and at the same time store energy based on the external power supply Sys_V.

[0077] It should be noted that when the camera system loses power, the shutter may work in the open state or the closed state. However, in order to protect the camera, it is necessary to control the shutter to close when the camera system loses power. Therefore, a power-off protection module including a pull-up module, a pull-down module and an energy storage device also needs to be set in the driving circuit to control the shutter to close after the camera system loses power.

[0078] It is not difficult to understand that the external power supply Sys_V first passes through the energy storage device and then supplies power to devices such as switches and AND gates in the drive circuit. Therefore, during the power-on process of the camera, the energy storage device can store a certain amount of energy based on the external power supply Sys_V. At the same time, the external power supply Sys_V provides the power supply VM for devices such as switches and AND gates to ensure the normal control process of the shutter. When the camera system loses power, the main control chip stops working and no longer outputs the first control signal and the second control signal. At this time, the drive circuit does not receive the first control signal and the second control signal. The energy stored in the energy storage device will discharge through the pull-up module, forming a high-level signal at the first end of the pull-up module, so that the first input terminals of the third AND gate U3 and the fourth AND gate U4 receive high-level signals, while the first input terminal of the first AND gate U1 and the second input terminal of the second AND gate U2 are pulled to ground by the pull-down module, equivalent to receiving low-level signals. Thus, the first AND gate U1, the second AND gate U2, the third AND gate U3, and the fourth AND gate U4 will control the conduction of the first switch Q1 and the fourth switch Q4 based on the received level signals, thereby controlling the shutter to close. In this embodiment, the design of the power-down protection circuit is based on the conduction of the first switch Q1 and the fourth switch Q4 corresponding to the closed state of the shutter. When the closed state of the shutter corresponds to the conduction of the second switch Q2 and the third switch Q3, the positions of the pull-up module and the pull-down module can be replaced with each other, which will not be elaborated in this application.

[0079] It can be understood that the specific types and implementation methods of the pull-up module, the pull-down module, and the energy storage device are not particularly limited in this application. The specific selection of the external power supply Sys_V and the output voltage situation can be set and adjusted according to the actual application requirements of the shutter. For example, when the required power supply for the shutter operation is 1.8V - 5.5V, the external power supply Sys_V can be implemented by a 4V power supply.

[0080] Specifically, through the pull-up module, the pull-down module, and the energy storage device, the power-down protection of the shutter can be effectively achieved, thus realizing a simple and low-cost shutter drive and power-down protection circuit. The entire drive circuit can achieve wide voltage and low power consumption, and can meet the functions of driving the shutter and automatically closing the shutter when the system loses power based on automotive-grade devices.

[0081] As an optional embodiment, the pull-up module is a pull-up resistor, and the pull-down module is a pull-down resistor.

[0082] It is not difficult to understand that the pull-up module and the pull-down module can be implemented by resistors. The specific implementation methods and resistance value selections of the pull-up resistor and the pull-down resistor are not particularly limited in this application. As Figure 3 shown, the pull-up module is implemented by the resistor R4, and the pull-down module is implemented by the resistor R6.

[0083] Specifically, the pull-up module and the pull-down module can be effectively implemented by simple resistors, with a simple structure, easy to implement, low cost, small size, capable of effectively saving costs, and conducive to the simple implementation of the entire drive circuit.

[0084] As an alternative embodiment, the energy storage device is a capacitor C. The first end of the capacitor C is connected to an external power supply Sys_V and serves as the output end of the energy storage device, and the second end is grounded.

[0085] It is not difficult to understand that the energy storage device can be specifically implemented by the capacitor C. When the camera system is powered on, the capacitor C stores electrical energy, and when the power is off, it supplies electrical energy to each device in the drive circuit. When the camera system is powered on, the external power supply Sys_V can charge the capacitor C, and the capacitor C stores energy. After the camera system is powered off, the energy storage capacitor C discharges. The first input terminal of the third AND gate U3 and the first input terminal of the fourth AND gate U4 corresponding to the second control signal are connected to the energy storage capacitor C through the pull-up module. Using the capacitor discharge characteristic to form a pulse signal, the four AND gates still maintain simultaneous operation. The pulse signal controls the logic AND gate, and through normal logical operations, it can drive the P-N mos bridge to control the shutter to close, so that the shutter can automatically close regardless of its state, achieving the effect of protecting the detector. The specific implementation method and parameter values of the capacitor are not particularly limited in this application.

[0086] Specifically, the energy storage device can be effectively implemented by a simple capacitor. The capacitor can achieve the energy storage process through charging. It has a simple structure, is easy to implement, has a low cost, and a small size, capable of effectively saving costs, and is conducive to the simple implementation of the entire drive circuit.

[0087] As an alternative embodiment, it further includes:

[0088] A unidirectional conduction module, with the positive electrode connected to the external power supply Sys_V and the negative electrode connected to the input end of the energy storage device.

[0089] It is not difficult to understand that considering that after an energy storage device is additionally provided in the drive circuit, the stored energy may flow back into the external power supply Sys_V, resulting in damage to the external power supply Sys_V and other situations. A one-way conduction module can be further added to the power-down protection circuit to specify the current flow direction, so that the current can only flow from the external power supply Sys_V to the drive circuit, avoiding the situation where the energy stored in the energy storage device flows out reversely; at the same time, it can also prevent the electric energy in the energy storage capacitor from flowing back into other circuits of the camera system after power-off. The diode can also play a role in voltage reduction to a certain extent and further protect the circuit. The specific type and implementation method of the one-way conduction module are not particularly limited in this application. Specifically, it can be implemented by a diode, such as Figure 4 As shown, the one-way conduction module can be implemented by setting the diode D0.

[0090] It should be noted that the specific setting methods of the various devices in the drive circuit can be set according to actual application requirements. Specifically, it can be implemented by means of surface-mount diodes, surface-mount logic AND gates, surface-mount P-N mosfets, and surface-mount energy storage capacitors; for parameters of the energy storage capacitor, including package size, capacitance value, number of capacitors set in the energy storage device, and capacitor voltage, etc., can be selected and set according to the actual application scenario of the entire drive circuit. The set number of capacitors can be adaptively adjusted according to the area of the power-down curve; for parameters of the diode, including p-n junction voltage drop, temperature curve, and package size, etc., parameters of the P-N mos bridge circuit, including drain-source rated voltage (Vds), gate-source rated voltage (Vgs), rated current (Id), maximum pulsed drain current (Idm), volt-ampere characteristic curve, package size, etc., and parameters of the logic AND gate, including high and low level voltages of input and output, noise margin, propagation delay time, power consumption, package size, etc., and parameters of each resistor, including resistance value, power consumption, accuracy, package size, etc., can all be selected and set according to the actual application scenario of the entire drive circuit.

[0091] Specifically, the circuit can be further protected by adding a one-way conduction module. The structure of the entire drive circuit is simple, with low cost, stable performance, low power consumption, small size, and easy implementation, making it more suitable for the development trend of miniaturized cameras; each device therein can be flexibly adjusted according to the actual application scenario, and has a wide range of applications.

[0092] To solve the above technical problems, the present utility model also provides a shutter system, including a shutter and the drive circuit of the shutter as described above.

[0093] Specifically, the present application does not make special limitations on the specific type and implementation manner of the shutter, etc., and it can be implemented through structures such as electromagnetic coils. The camera system may further include a detector and other circuit modules. The present application does not make special limitations on the specific type and implementation manner of the detector, etc. For other circuits of the camera system and their specific implementation manners, they can be set and adjusted according to actual application requirements, and are not limited to the shutter drive circuit and the power-off protection circuit therein proposed by the present application.

[0094] For the introduction of a shutter system provided by the present utility model, please refer to the embodiments of the above-mentioned shutter drive circuit, and the present utility model will not be elaborated herein.

[0095] To solve the above technical problems, the present utility model further provides a camera system, including a detector and the aforementioned shutter system.

[0096] For the introduction of a camera system provided by the present utility model, please refer to the embodiments of the above-mentioned shutter drive circuit and the shutter system, and the present utility model will not be elaborated herein.

[0097] It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0098] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A driving circuit for a shutter, characterized in that, Including: A logic control module, with its first input terminal connected to a first control signal and its second input terminal connected to a second control signal; A first voltage output module, with its input terminal connected to the first output terminal of the logic control module and its output terminal connected to the first end of the shutter, for outputting a first voltage corresponding to the first control signal under the control of the logic control module; A second voltage output module, with its input terminal connected to the second output terminal of the logic control module and its output terminal connected to the second end of the shutter, for outputting a second voltage corresponding to the second control signal under the control of the logic control module; the first control signal and the second control signal are opposite.

2. The drive circuit of the shutter according to claim 1, characterized in that, The logic control module includes a first logic circuit with its input terminal connected to the first control signal, a second logic circuit with its input terminal connected to the first control signal, a third logic circuit with its input terminal connected to the second control signal, and a fourth logic circuit with its input terminal connected to the second control signal; the first voltage output module includes a first switch and a second switch, and the second voltage output module includes a third switch and a fourth switch; The control terminal of the first switch is connected to the output terminal of the first logic circuit, the control terminal of the second switch is connected to the output terminal of the second logic circuit, the control terminal of the third switch is connected to the output terminal of the third logic circuit, the control terminal of the fourth switch is connected to the output terminal of the fourth logic circuit, the first ends of the first switch and the third switch are both connected to the power supply, the first end of the shutter is respectively connected to the second end of the first switch and the first end of the second switch, the second end of the shutter is respectively connected to the second end of the third switch and the first end of the fourth switch, and the second ends of the second switch and the fourth switch are both grounded; The operating states of the first switch and the second switch are opposite, and the operating states of the third switch and the fourth switch are opposite; The first control signal and the second control signal are opposite.

3. The drive circuit of the shutter according to claim 2, characterized in that, The first logic circuit is a first AND gate, the second logic circuit is a second AND gate, the third logic circuit is a third AND gate, and the fourth logic circuit is a fourth AND gate; The first input terminal of the first AND gate is connected to the first control signal, the second input terminal is connected to the power supply, and the output terminal is connected to the control terminal of the first switch; The first input terminal of the second AND gate is connected to the first control signal, the second input terminal is connected to the power supply, and the output terminal is connected to the control terminal of the second switch; The first input terminal of the third AND gate is connected to the second control signal, the second input terminal is connected to the power supply, and the output terminal is connected to the control terminal of the third switch; The first input terminal of the fourth AND gate is connected to the second control signal, the second input terminal is connected to the power supply, and the output terminal is connected to the control terminal of the fourth switch.

4. The driving circuit of the shutter according to claim 3, characterized in that, It further includes: A first current limiting module, with its first end respectively connected to the second input terminals of the first AND gate and the second AND gate; A second current limiting module, the first end of which is respectively connected to the power supply, the second end of the first current limiting module, the first end of the first switch, and the first end of the third switch, and the second end of which is respectively connected to the second input end of the third AND gate and the second input end of the fourth AND gate.

5. The drive circuit of the shutter according to claim 4, characterized in that, It further includes: A first noise reduction module, the first end of which receives a first control signal, and the second end of which is respectively connected to the first input end of the first AND gate and the first input end of the second AND gate; A second noise reduction module, the first end of which receives a second control signal, and the second end of which is respectively connected to the first input end of the third AND gate and the first input end of the fourth AND gate.

6. The drive circuit of the shutter according to any one of claims 3 to 5, characterized in that It further includes: A pull-up module, the first end of which is respectively connected to the first input end of the third AND gate and the first input end of the fourth AND gate; A pull-down module, the first end of which is respectively connected to the first input end of the first AND gate and the first input end of the second AND gate, and the second end of which is grounded; An energy storage device, the input end of which is connected to an external power supply, and the output end of which is connected to the second end of the pull-up module, and serves as a power supply, and is respectively connected to the second input end of the first AND gate, the second input end of the second AND gate, the second input end of the third AND gate, the second input end of the fourth AND gate, the first end of the first switch, and the first end of the third switch, and is used to provide a power supply for the driving circuit of the shutter through the external power supply, and simultaneously store energy based on the external power supply.

7. The drive circuit of the shutter according to claim 6, wherein, The energy storage device is a capacitor, the first end of which is connected to an external power supply and serves as the output end of the energy storage device, and the second end of which is grounded.

8. The driving circuit of the shutter according to claim 6, characterized in that, It further includes: A one-way conduction module, the positive pole of which is connected to an external power supply, and the negative pole of which is connected to the input end of the energy storage device.

9. A shutter system, characterized in that, It includes a shutter and a driving circuit of the shutter according to any one of claims 1 to 8.

10. A camera system, characterized in that, It includes a detector and a shutter system according to claim 9.

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