LED lamp driving control device and code reading equipment

Abstract

The utility model relates to an LED lamp driving control device and code reading equipment, and the device comprises a capacitor which is electrically connected with an LED lamp and provides the LED lamp with electric energy of a first amplitude; the first switch is electrically connected with the LED lamp and the capacitor; the power supply unit is electrically connected with the capacitor and provides electric energy with a second amplitude for the capacitor, and the second amplitude is smaller than the first amplitude; the second switch is electrically connected with the capacitor and the power supply unit; the control unit is in communication connection with the first switch and the second switch, and the control unit controls the second switch to be switched on in the non-exposure time so as to switch on a circuit between the capacitor and the power supply unit; and in the exposure time, the control unit controls the first switch to be turned on and controls the second switch to be turned off, so that a circuit between the capacitor and the LED lamp is switched on, and a circuit between the capacitor and the power supply unit is switched off. Through capacitor energy storage and a time-sharing control strategy, on the premise that the power supply power is not changed, the brightness bottleneck of the LED lamp is broken through, the stability of the LED lamp is improved, and meanwhile the hardware cost and the energy consumption are reduced.

Description

Technical Field

[0001] This application relates to the field of camera technology, and in particular to an LED light driver control device and a code reading device including the LED light driver control device. Background Technology

[0002] The images or videos output by the camera need to be acquired by the image sensor through line-by-line or frame-by-frame exposure, and LEDs are required to provide sufficient brightness for the acquired images to achieve the desired image effect. Current technology typically relies on the direct output current from the power supply, controlling the brightness of the LEDs by adjusting the magnitude of the driving current or the level of the driving voltage. This approach is limited by the power supply's capacity and the cost of the power adapter, making it difficult to meet the demand for instantaneous high brightness in dim environments. Furthermore, because the LEDs are directly driven by the power supply, voltage fluctuations can easily lead to unstable LED brightness. Utility Model Content

[0003] Therefore, it is necessary to address the aforementioned technical problems by providing an LED lamp driver control device and a code reader device including the LED lamp driver control device. By setting a capacitor and optimizing the energy storage and discharge timing, the brightness of the LED lamp can be significantly improved without changing the power supply. Simultaneously, by isolating the power supply unit during exposure and supplying power independently to the capacitor, the stability of the LED lamp during exposure can be ensured.

[0004] In a first aspect, this application provides an LED lamp driver control device, comprising:

[0005] A capacitor is used to electrically connect to the LED lamp and to provide the LED lamp with an initial value of electrical energy.

[0006] The first switch is electrically connected between the LED and the capacitor to control the on / off state of the circuit between the LED and the capacitor.

[0007] A power supply unit is used to be electrically connected to the capacitor and to provide the capacitor with electrical energy of a second amplitude, wherein the second amplitude is less than the first amplitude;

[0008] The second switch is electrically connected between the capacitor and the power supply unit, and is used to control the on / off state of the circuit between the capacitor and the power supply unit.

[0009] The control unit is communicatively connected to the first switch and the second switch respectively. During the non-exposure time, the control unit controls the second switch to open to connect the circuit between the capacitor and the power supply unit. During the exposure time, the control unit controls the first switch to open and the second switch to close to connect the circuit between the capacitor and the LED lamp and disconnect the circuit between the capacitor and the power supply unit.

[0010] In one embodiment, the LED lamp driver control device includes a DC-DC converter unit electrically connected between a capacitor and a first switch, or electrically connected between a first switch and an LED lamp. The DC-DC converter unit is used to adjust the voltage of the electrical energy supplied by the capacitor to the LED lamp.

[0011] In one embodiment, the DC-DC converter unit includes a boost chopper and / or a buck chopper, wherein the boost chopper is used to receive electrical energy of a first amplitude provided by a capacitor and output electrical energy greater than the first amplitude; and the buck chopper is used to receive electrical energy of a first amplitude provided by a capacitor and output electrical energy less than the first amplitude.

[0012] In one embodiment, the DC-DC converter unit includes a boost chopper and a buck chopper, which are connected in parallel.

[0013] In one embodiment, the LED lamp driving control device includes an analog-to-digital converter (ADC), which is electrically connected to the control unit and the LED lamp respectively, and is used to detect the voltage signal of the LED lamp. The control unit is electrically connected to a boost chopper and a buck chopper respectively, and is used to control the start and stop of the boost chopper and the buck chopper based on the detection signal of the ADC.

[0014] In one embodiment, the LED lamp driver control device includes a photosensitive sensor electrically connected to a control unit and used to detect the brightness of the external environment. The control unit is electrically connected to a first switch and a second switch respectively, and controls the opening and closing timing of the first switch and the second switch based on the detection signal of the photosensitive sensor.

[0015] In one embodiment, the LED lamp driving control device includes a constant current driving circuit, which is electrically connected between the capacitor and the first switch, or the constant current driving circuit is electrically connected between the first switch and the LED lamp. The constant current driving circuit is used to adjust the magnitude of the current supplied by the capacitor to the LED lamp.

[0016] In one embodiment, the LED lamp driver control device includes an AC-DC converter unit electrically connected between a power supply unit and a second switch. The AC-DC converter unit is used to convert the AC power provided by the power supply unit into DC power and deliver it to the capacitor through the second switch.

[0017] In one embodiment, the first switch and / or the second switch comprises a metal-oxide-semiconductor field-effect transistor.

[0018] Secondly, this application provides a code reading device, including an LED lamp and an LED lamp driving control device as described in any of the above embodiments. The LED lamp is electrically connected to the LED lamp driving control device, which is used to control the brightness of the LED lamp.

[0019] The aforementioned LED lamp driver control device and code reader provide constant electrical energy through a power supply unit. During non-exposure time, the control unit opens the second switch, connecting the circuit between the capacitor and the power supply unit, allowing the power supply unit to charge and store charge in the capacitor. During exposure time, the control unit opens the first switch, connecting the circuit between the capacitor and the LED, allowing the capacitor to discharge instantaneously, providing the LED with electrical energy of a higher amplitude than that of the power supply unit. Since the peak value of the instantaneous current provided by the capacitor can exceed the rated power of the power supply, the brightness of the LED can be significantly improved. Simultaneously, the control unit can also close the second switch during exposure time, disconnecting the circuit between the capacitor and the power supply unit, isolating the power supply unit from the capacitor's independent power supply, ensuring the stability of the LED during exposure. This application enables time-sharing control of capacitor charging during non-exposure time and discharging during exposure time, avoiding continuous high-load operation of the power supply unit and reducing ineffective energy consumption (such as the constant current loss required to maintain brightness in the prior art). In other words, this application, through capacitor energy storage and a time-sharing control strategy, overcomes the LED brightness bottleneck and improves LED stability while reducing hardware costs and energy consumption, all while maintaining constant power supply. Attached Figure Description

[0020] Figure 1 This is a block diagram illustrating an application scenario of the LED lamp driver control device provided in one embodiment of this application.

[0021] Figure 2 This is a structural block diagram of the LED lamp driver control device provided in the first embodiment of this application;

[0022] Figure 3 This is a structural block diagram of the LED lamp driver control circuit provided in the second embodiment of this application;

[0023] Figure 4 This is a structural block diagram of the LED lamp driver control device provided in the third embodiment of this application;

[0024] Figure 5 This is a structural block diagram of the LED lamp driver control device provided in the fourth embodiment of this application;

[0025] Figure 6 This is a structural block diagram of the LED lamp driver control device provided in the fifth embodiment of this application;

[0026] Figure 7This is a structural block diagram of the LED lamp driver control device provided in the sixth embodiment of this application;

[0027] Figure 8 This is a structural block diagram of the LED lamp driver control device provided in the seventh embodiment of this application;

[0028] Figure 9 This is a structural block diagram of the LED lamp driver control device provided in the eighth embodiment of this application;

[0029] Figure 10 This is a structural block diagram of the LED lamp driver control device provided in the ninth embodiment of this application;

[0030] Figure 11 This is a structural block diagram of the LED lamp driver control device provided in the tenth embodiment of this application;

[0031] Figure 12 This is a structural block diagram of the LED lamp driver control device provided in the eleventh embodiment.

[0032] Reference numerals: 300-Code reader; 301-LED light; 302-Image sensor; 303-Monitor; 200-LED light driver control device; 10-Capacitor; 20-First switch; 30-Power supply unit; 40-Second switch; 50-DC-DC converter; 51-Boost chopper; 52-Buck chopper; 60-Analog-to-digital converter; 70-Control unit; 80-Photosensitive sensor; 90-Constant current drive circuit; 100-AC-DC converter; 110-Voltage detection unit; 111-Voltage divider circuit; 112-Analog-to-digital converter circuit; 113-Voltage comparator. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0034] The barcode reading device 300 provided in this application includes an LED lamp 301 and an LED lamp driver control device 200. The LED lamp driver control device 200 is electrically connected to the LED lamp 301 and is used to control the brightness of the LED lamp 301. Please refer to [reference needed]. Figure 1 , Figure 1 This is a block diagram illustrating an application scenario of the LED lamp driver control device 200 provided in one embodiment of this application.

[0035] like Figure 1As shown, in one embodiment, the code reading device 300 provided in this application can be applied to a camera. The code reading device 300 may include an image sensor 302, an LED light 301, and an LED light driver control device 200. The LED light 301 is electrically connected to the LED light driver control device 200. The LED light driver control device 200 receives a trigger signal, analyzes the scene, and outputs a control signal to control the LED light 301 to emit light of the required brightness. The image sensor 302 receives the optical signal from the LED light 301, converts the optical signal into an electrical signal, and finally forms a digital image. The captured image or video is then displayed by the camera's monitor 303, realizing the camera's recording function.

[0036] It should be noted that the application of the code reader 300 to a camera in the above embodiments is merely an example and does not represent the actual application scenarios of the code reader 300 in other embodiments of this application. That is, the application scenarios of the code reader 300 in this application include, but are not limited to, cameras.

[0037] Please refer to the above. Figure 2 , Figure 2 This is a structural block diagram of the LED lamp driver control device 200 provided in the first embodiment of this application.

[0038] like Figure 2As shown, the LED lamp driver control device 200 provided in this application includes a capacitor 10, a first switch 20, a power supply unit 30, a second switch 40, and a control unit 70. The capacitor 10 is electrically connected to the LED lamp 301 and provides the LED lamp 301 with a first amplitude of electrical energy. The first switch 20 is electrically connected between the LED lamp 301 and the capacitor 10 and controls the on / off state of the circuit between the LED lamp 301 and the capacitor 10. The power supply unit 30 is electrically connected to the capacitor 10 and provides the capacitor 10 with a second amplitude of electrical energy, wherein the second amplitude is less than the first amplitude. The second switch 40 is electrically connected between the capacitor 10 and the power supply unit 30 and controls the on / off state of the circuit between the capacitor 10 and the power supply unit 30. That is, the power supply unit 30, the second switch 40, the capacitor 10, the first switch 20, and the LED lamp 301 are connected in sequence. The power supply unit 30 serves as the power input terminal and provides constant electrical energy. LED 301 serves as a power output terminal, converting electrical energy into light energy to provide supplementary lighting for the image capture by the barcode reader 300. In other words, the function of LED 301 is to provide sufficient brightness for the camera to capture the image and achieve the desired image effect. Control unit 70 is communicatively connected to the first switch 20 and the second switch 40, and is used to control the opening and closing of the first switch 20 and the second switch 40. Specifically, control unit 70 controls the second switch 40 to open during non-exposure times to connect the circuit between capacitor 10 and power supply unit 30, charging capacitor 10. Control unit 70 also controls the first switch 20 to open during exposure times to connect the circuit between capacitor 10 and LED 301, using capacitor 10 to charge the LED. Simultaneously, control unit 70 also controls the second switch 40 to close during exposure times to disconnect the circuit between capacitor 10 and power supply unit 30.

[0039] In this embodiment, capacitor 10 is supplied with constant electrical energy through power supply unit 30. During non-exposure times, control unit 70 opens second switch 40, connecting the circuit between capacitor 10 and power supply unit 30, allowing power supply unit 30 to charge and store charge in capacitor 10. During exposure times, control unit 70 opens first switch 20, connecting the circuit between capacitor 10 and LED lamp 301, allowing capacitor 10 to discharge instantaneously, providing LED lamp 301 with electrical energy of a higher amplitude than that of power supply unit 30. Since the peak value of the instantaneous current provided by capacitor 10 can exceed the rated power of power supply unit 30, the brightness of LED lamp 301 can be significantly improved. Simultaneously, during exposure times, control unit 70 can also close second switch 40, disconnecting the circuit between capacitor 10 and power supply unit 30, isolating power supply unit 30 from independent power supply through capacitor 10, ensuring the stability of LED lamp 301 during exposure. This application enables time-sharing control of capacitor 10 for charging during non-exposure times and discharging during exposure times, avoiding continuous high-load operation of power supply unit 30 and reducing ineffective energy consumption (such as the constant current loss required to maintain brightness in the prior art). This application utilizes a capacitor 10 for energy storage and a time-sharing control strategy to overcome the LED brightness bottleneck and improve the stability of the LED lamp 301 while reducing hardware costs and energy consumption, all while maintaining the same power supply.

[0040] Please refer to the above. Figure 3 , Figure 3 This is a structural block diagram of the LED lamp 301 driving control circuit provided in the second embodiment of this application.

[0041] like Figure 3 As shown, in one embodiment, the LED lamp 301 driver provided in this application includes a DC-DC converter unit 50, which is electrically connected between the capacitor 10 and the first switch 20. The DC-DC converter unit 50 is used to adjust the voltage of the electrical energy supplied by the capacitor 10 to the LED lamp 301. That is, by setting the DC-DC converter unit 50 between the capacitor 10 and the first switch 20, this application can adjust the voltage output by the capacitor 10 as needed, further optimizing energy utilization and the control capability of the LED lamp 301 brightness. Alternatively, it can be understood that this application achieves "energy storage + voltage regulation" dual-degree-of-freedom control through the cooperation of the capacitor 10 and the DC-DC converter unit 50. In addition, the DC-DC converter unit 50 can also convert the temporary charge stored in the capacitor 10 into a stable voltage, further suppressing voltage fluctuations during the discharge phase of the capacitor 10, and ensuring the stability of the driving current of the LED lamp 301.

[0042] It should be noted that in the above embodiment, the DC-DC converter unit 50 is electrically connected between the capacitor 10 and the first switch 20, which is only an example. In another embodiment, the DC-DC converter unit 50 can be electrically connected between the first switch 20 and the LED lamp 301, which can also achieve the same technical effect, and will not be described in detail here.

[0043] For details, please refer to the following: Figure 4 , Figure 4 This is a structural block diagram of the LED lamp driver control device 200 provided in the third embodiment of this application.

[0044] like Figure 4 As shown, in one embodiment, the DC-DC converter 50 provided in this application includes a boost chopper 51, which is electrically connected between the capacitor 10 and the first switch 20. The boost chopper 51 is used to receive electrical energy of a first amplitude provided by the capacitor 10 and output electrical energy greater than the first amplitude. That is, the boost chopper 51 is used to increase the input voltage of the LED lamp 301 so that the LED lamp 301 can obtain a higher current in a short time, thereby enhancing the brightness.

[0045] The structure of the DC-DC converter unit 50 including the boost chopper 51 in the above embodiments is only described as an example. For example, in Figure 5 In the embodiment shown, Figure 5 The diagram shows the structure of the LED lamp driver control device 200 provided in the fourth embodiment of this application. The DC-DC conversion unit 50 includes a buck chopper 52. The buck chopper 52 is electrically connected between the capacitor 10 and the first switch 20. The buck chopper 52 receives electrical energy of a first amplitude provided by the capacitor 10 and outputs electrical energy less than the first amplitude. That is, the buck chopper 52 reduces the input voltage of the LED lamp 301 to prolong the discharge time of the capacitor 10, avoids excessive energy depletion, and thus meets the needs of scenarios requiring longer supplemental lighting but with lower brightness requirements.

[0046] In another embodiment, please refer to [reference needed]. Figure 6 , Figure 6 This is a structural block diagram of the LED lamp driver control device 200 provided in the fifth embodiment of this application. Figure 6As shown, in one embodiment, the DC-DC converter unit 50 includes a boost chopper 51 and a buck chopper 52, which are connected in parallel and electrically connected between the capacitor 10 and the first switch 20. Thus, by controlling the operating states of the boost chopper 51 and the buck chopper 52, multi-mode dynamic collaborative control can be achieved. That is, the code reader 300 can flexibly switch between boost mode for ultra-high brightness supplementary lighting and buck mode for sustained supplementary lighting within a single exposure cycle. For example, in high-speed photography, the boost chopper 51 can be turned on and the buck chopper 52 can be turned off. The code reader 300 uses boost mode to output a momentary light wave from the LED lamp 301 to capture a clear image, and then immediately turns off the boost chopper 51 and turns on the buck chopper 52 to switch to buck mode, allowing the LED lamp 301 to maintain low-brightness auxiliary lighting, thereby balancing peak brightness and energy consumption optimization.

[0047] In this embodiment, the boost chopper 51 and the buck chopper 52 can be redundant. If either one fails, the other can still maintain the basic supplementary lighting function, reducing the risk of the LED lamp 301 drive control circuit crashing. That is, by connecting the boost chopper 51 and the buck chopper 52 in parallel to adjust the input voltage of the LED lamp 301 in real time, this application can simultaneously achieve brightness limit expansion and supplementary lighting duration extension, and also improve the fault tolerance of the LED lamp 301 drive control, providing support for high dynamic range imaging and multi-mode intelligent supplementary lighting.

[0048] Please refer to the above. Figure 7 , Figure 7 This is a structural block diagram of the LED lamp driver control device 200 provided in the sixth embodiment of this application.

[0049] like Figure 7 As shown, in one embodiment, the LED lamp driver control device 200 provided in this application includes an analog-to-digital converter 60 and a control unit 70. The analog-to-digital converter 60 is electrically connected to both the control unit 70 and the LED lamp 301. The analog-to-digital converter 60 is used to detect the voltage signal of the LED lamp 301. The control unit 70 is electrically connected to a boost chopper 51 and a buck chopper 52, and the control unit 70 is used to control the switching on and off of the boost chopper 51 and the buck chopper 52 based on the detection signal from the analog-to-digital converter 60.

[0050] In this embodiment, an analog-to-digital converter (ADC) unit 60 and a control unit 70 are configured to form a closed-loop feedback mechanism. The ADC unit 60 monitors the voltage signal of the LED 301 in real time, and the control unit 70 controls the operation of the boost chopper 51 and buck chopper 52 based on this detection signal. For example, if the ADC unit 60 detects insufficient LED voltage during the exposure stage (e.g., a sudden darkening of the environment), the control unit 70 receives the signal and immediately triggers the boost chopper 51 to increase the output voltage; if the ADC unit 60 detects excessive voltage (e.g., impedance changes due to increased LED temperature), the control unit 70 receives the signal and switches to buck mode to avoid overvoltage damage and ensure that the brightness always accurately matches the scene requirements. In other words, the LED lamp drive control device 200 of this application achieves active intelligent regulation through the ADC unit 60 and the control unit 70, providing an adaptive solution for complex lighting scenes.

[0051] In one embodiment, the control unit 70 is electrically connected to the first switch 20 and the second switch 40 respectively, and the control unit 70 is used to control the opening and closing of the first switch 20 and the second switch 40.

[0052] Please refer to the above. Figure 8 , Figure 8 This is a structural block diagram of the LED lamp driver control device 200 provided in the seventh embodiment of this application.

[0053] like Figure 8 As shown, in one embodiment, the LED lamp driver control device 200 provided in this application includes a photosensor 80, which is electrically connected to a control unit 70. The photosensor 80 is used to detect the brightness of the external environment. The control unit 70 is electrically connected to a first switch 20 and a second switch 40, respectively, and controls the opening and closing timing of the first switch 20 and the second switch 40 based on the detection signal from the photosensor 80.

[0054] In this embodiment, the LED lamp driver control device 200 of this application achieves closed-loop control by introducing a photosensitive sensor 80 to monitor the ambient brightness, realizing adaptive supplementary lighting decision-making based on the original time-sharing energy storage. For example, in a dim environment, the photosensitive sensor 80 monitors the ambient brightness and transmits it to the control unit 70. The control unit 70 starts charging the capacitor 10 in advance and extends the high-brightness output of the exposure stage based on the detection signal. In a bright environment, the photosensitive sensor 80 monitors the ambient brightness and transmits it to the control unit 70. The control unit 70 reduces the supplementary lighting duration or lowers the brightness threshold based on the detection signal to avoid energy waste caused by excessive supplementary lighting. For scenarios with sudden changes in lighting (such as tunnel entry and exit, flash interference), this application uses the photosensitive sensor 80 to quickly trigger the control unit 70 to switch charging and discharging strategies, ensuring that the supplementary lighting brightness seamlessly matches the environmental changes (such as when suddenly entering darkness from strong light, the capacitor 10 instantly discharges at full power), avoiding supplementary lighting delays or overexposure problems caused by fixed timing control.

[0055] Please refer to the above. Figure 9 , Figure 9 This is a structural block diagram of the LED lamp driver control device 200 provided in the eighth embodiment of this application.

[0056] like Figure 9 As shown, in one embodiment, the LED lamp driving control device 200 provided in this application further includes a constant current driving circuit 90, which is electrically connected between the first switch 20 and the LED lamp 301. The constant current driving circuit 90 is used to adjust the magnitude of the current supplied by the capacitor 10 to the LED lamp 301.

[0057] In this embodiment, the input current of the LED lamp 301 may fluctuate due to changes in the load of the LED lamp 301 or the characteristics of the LED. This application directly regulates the input current of the LED lamp 301 by setting a constant current drive circuit 90, which can avoid the influence of voltage fluctuations or changes in the impedance of the LED lamp 301 on the brightness, thereby ensuring the stability of brightness during exposure. In addition, the constant current drive circuit 90 can limit the maximum drive current of the LED lamp 301 and suppress transient overcurrents (such as the current spike of instantaneous discharge of capacitor 10), avoiding premature aging of the LED lamp 301 due to the accumulation of thermal stress, thereby improving the service life of the LED lamp 301.

[0058] It should be noted that in the above embodiment, the constant current drive circuit 90 is electrically connected between the first switch 20 and the LED lamp 301, and is only described as an example. In another embodiment, the constant current drive circuit 90 can be electrically connected between the first switch 20 and the capacitor 10, which can also achieve the same technical effect, and will not be described in detail here.

[0059] Please refer to the above. Figure 10 , Figure 10 This is a structural block diagram of the LED lamp driver control device 200 provided in the ninth embodiment of this application.

[0060] like Figure 10 As shown, in one embodiment, the LED lamp driver control device 200 provided in this application includes an AC-DC converter unit 100, which is electrically connected between the power supply unit 30 and the second switch 40. The AC-DC converter unit 100 is used to convert the AC power provided by the power supply unit 30 into DC power and deliver it to the capacitor 10 through the second switch 40.

[0061] In this embodiment, the AC-DC conversion unit 100 enables the LED lamp driver control device 200 of this application to be compatible with AC power, eliminating the need for an external adapter. This simplifies system design, reduces costs, and makes it suitable for more application scenarios (such as security monitoring, industrial lighting, and other applications requiring direct grid connection). The AC-DC conversion unit 100 of this application is compatible with both DC and AC power supplies. In other words, by integrating the AC-DC conversion unit 100, this application achieves wide power supply compatibility while maintaining the original time-sharing control of capacitor 10's charging and discharging.

[0062] In one embodiment, the first switch 20 and the second switch 40 comprise metal-oxide-semiconductor field-effect transistors (MOSFETs). That is, the first switch 20 and the second switch 40 are fabricated using MOSFETs. Based on the characteristics of MOSFETs—high-speed switching, low on-resistance, high input impedance, and low power consumption—this application uses MOSFETs to fabricate the first switch 20 and the second switch 40. The faster switching speed reduces the charge-discharge switching time, resulting in almost zero delay in the charge-discharge timing, ensuring that the capacitor 10's capacity is instantly released to the LED 301 during the exposure stage. Simultaneously, the lower on-resistance significantly reduces the voltage drop and heat loss in the switching path, maximizing energy retention during the non-exposure stage.

[0063] Please cooperate. Figure 11 , Figure 11 This is the LED lamp driver control device 200 provided in the tenth embodiment of this application.

[0064] like Figure 11As shown, in one embodiment, the LED lamp driver control device 200 provided in this application further includes a voltage detection unit 110, which is electrically connected to the capacitor 10 and the control unit 70 respectively. The voltage detection unit 110 is used to detect the voltage of the capacitor 10 in real time and transmit the detection signal to the control unit 70. The control unit 70 controls the opening and closing of the second switch 40 based on the detection signal. For example, during non-exposure periods, the second switch 40 is opened to connect the circuit between the power supply unit 30 and the capacitor 10, at which time the capacitor 10 is in a charging state. The voltage detection unit 110 is used to monitor the voltage of the capacitor 10 in real time. When the voltage detection unit 110 detects that the voltage of the capacitor 10 reaches a preset threshold (such as 95% of the rated voltage of the capacitor), the control unit 70 receives the detection signal and determines that the remaining capacity of the capacitor 10 is insufficient. At this time, the control unit 70 controls the second switch 40 to close, thereby disconnecting the circuit between the power supply unit 30 and the capacitor 10, stopping the charging of the capacitor 10, avoiding overcharging of the capacitor 10, and extending the service life of the capacitor 10.

[0065] Please refer to the above. Figure 12 , Figure 12 This is a structural block diagram of the LED lamp driver control device 200 provided in the eleventh embodiment.

[0066] like Figure 12 As shown, in one embodiment, the voltage detection unit 110 includes a voltage divider circuit 111, an analog-to-digital converter circuit 112, and a voltage comparator 113. The input terminal of the voltage divider circuit 111 is electrically connected to the capacitor 10, and the output terminal of the voltage divider circuit 111 is connected to the input terminals of the analog-to-digital converter circuit 112 and the voltage comparator 113. The analog-to-digital converter circuit 112 and the voltage comparator 113 are connected in parallel. The output terminals of the analog-to-digital converter circuit 112 and the voltage comparator 113 are respectively connected to the control unit 70. The voltage divider circuit 111 is used to proportionally divide the high voltage of the capacitor 10 to a range detectable by the analog-to-digital converter circuit 112, ensuring the safety of the detection. The analog-to-digital converter circuit 112 converts the divided analog voltage into a digital signal and transmits it to the control unit 70. The voltage comparator 113 is used to quickly determine the overcharge state. The control unit 70 reads and analyzes the digital signal of the analog-to-digital converter circuit 112, and, in conjunction with the signal of the voltage comparator 113, determines the state of the capacitor 10 and controls the opening and closing of the second switch 40.

[0067] In one embodiment, when the voltage detection unit 110 detects that the voltage of capacitor 10 drops from a preset threshold (e.g., 95% of the capacitor's rated voltage) to a preset value (e.g., 90% of the capacitor's rated voltage), the control unit 70 receives the detection signal and controls the second switch 40 to reopen, connecting the power supply unit 30 and capacitor 10 to recharge capacitor 10. This prevents frequent switching operations caused by voltage fluctuations around the preset threshold, extending the service life of the second switch 40.

[0068] It should be noted that the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. An LED lamp driver control device, characterized in that, include: A capacitor is used for electrical connection with an LED lamp and for providing the LED lamp with a first amplitude of electrical energy; The first switch is electrically connected between the LED and the capacitor to control the on / off state of the circuit between the LED and the capacitor. A power supply unit is used to be electrically connected to the capacitor and to provide the capacitor with electrical energy of a second amplitude, wherein the second amplitude is less than the first amplitude; The second switch is electrically connected between the capacitor and the power supply unit, and is used to control the on / off state of the circuit between the capacitor and the power supply unit; The control unit is communicatively connected to the first switch and the second switch respectively. During the non-exposure time, the control unit controls the second switch to open so as to connect the circuit between the capacitor and the power supply unit. During the exposure time, the control unit controls the first switch to open and the second switch to close, thereby connecting the circuit between the capacitor and the LED and disconnecting the circuit between the capacitor and the power supply unit.

2. The LED lamp driver control device according to claim 1, characterized in that, The LED lamp driving control device includes a DC-DC converter unit, which is electrically connected between the capacitor and the first switch, or the DC-DC converter unit is electrically connected between the first switch and the LED lamp. The DC-DC converter unit is used to adjust the voltage of the electrical energy supplied by the capacitor to the LED lamp.

3. The LED lamp driver control device according to claim 2, characterized in that, The DC-DC conversion unit includes a boost chopper and / or a buck chopper. The boost chopper is used to receive electrical energy of a first amplitude provided by the capacitor and output electrical energy greater than the first amplitude. The buck chopper is used to receive electrical energy of a first amplitude provided by the capacitor and output electrical energy of less than the first amplitude.

4. The LED lamp driver control device according to claim 3, characterized in that, The DC-DC converter unit includes a boost chopper and a buck chopper, which are connected in parallel.

5. The LED lamp driver control device according to claim 4, characterized in that, The LED lamp driving control device includes an analog-to-digital converter (ADC), which is electrically connected to the control unit and the LED lamp respectively, and is used to detect the voltage signal of the LED lamp. The control unit is electrically connected to the boost chopper and the buck chopper respectively, and is used to control the start and stop of the boost chopper and the buck chopper based on the detection signal of the ADC.

6. The LED lamp driver control device according to claim 5, characterized in that, The LED light driver control device includes a photosensitive sensor, which is electrically connected to the control unit and is used to detect the brightness of the external environment. The control unit is electrically connected to the first switch and the second switch respectively, and controls the opening and closing timing of the first switch and the second switch based on the detection signal of the photosensitive sensor.

7. The LED lamp driver control device according to any one of claims 1-6, characterized in that, The LED lamp driving control device includes a constant current driving circuit, which is electrically connected between the capacitor and the first switch, or the constant current driving circuit is electrically connected between the first switch and the LED lamp. The constant current driving circuit is used to adjust the magnitude of the current supplied by the capacitor to the LED lamp.

8. The LED lamp driving control device according to any one of claims 1-6, characterized in that, The LED lamp driving control device includes an AC-DC conversion unit, which is electrically connected between the power supply unit and the second switch. The AC-DC conversion unit is used to convert the AC power provided by the power supply unit into DC power and deliver it to the capacitor through the second switch.

9. The LED lamp driving control device according to any one of claims 1-6, characterized in that, The first switch and / or the second switch comprise a metal-oxide-semiconductor field-effect transistor.

10. A code reading device, characterized in that, The device includes an LED lamp and an LED lamp driving control device as described in any one of claims 1-9, wherein the LED lamp is electrically connected to the LED lamp driving control device, and the LED lamp driving control device is used to control the brightness of the LED lamp.

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