An IRCUT lens for coil protection
By setting up a coil protection switching circuit inside the IRCUT lens of the IPC surveillance camera, the coil voltage is monitored in real time and reset or shut off the power supply when abnormal, thus solving the problem of coil burnout and ensuring the normal operation and safety of the lens.
Patent Information
- Application Number
- CN202522032594.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-19
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-09-19
AI Technical Summary
In existing IPC surveillance cameras, the coil in the IRCUT lens is prone to burnout during switching, resulting in poor imaging quality and safety hazards.
A coil protection switching circuit is installed inside the IRCUT lens. The main control module monitors the voltage across the coil in real time and resets or shuts off the power when an abnormality is detected to prevent the coil from overheating and burning out.
It effectively prevents coil burnout, ensures normal lens operation, avoids image redness and fire risks, and improves imaging stability and safety.
Smart Images
Figure CN224684273U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electronic technology, and in particular to an IRCUT lens for coil protection. Background Technology
[0002] In existing IPC (Internet Protocol Camera) surveillance camera lens modules, the IRCUT (infrared switching) lens is an automatic switching system combining an infrared cut-off filter and a full-spectrum filter. It is mainly used to automatically switch filters based on the intensity of light. During the day, the infrared cut-off filter is used to filter infrared light to avoid color distortion; at night, the infrared cut-off filter is switched off automatically, and the full-spectrum filter starts working to enhance the infrared fill light effect, thus ensuring imaging effect under different lighting conditions.
[0003] The switching between the two filters is driven by an electromagnetic coil. Due to the small size and low cost of coil-driven systems, they are widely used in most surveillance cameras. During switching, the coil is energized. Typically, the opening and closing of an IRCUT lens takes 100ms to 200ms. If this time is too long or external interference causes a sudden increase in current, the coil can easily overheat, potentially burning out or even causing a fire. This would prevent the two filters from switching, resulting in a reddish image, affecting imaging quality, and posing certain safety hazards. Utility Model Content
[0004] To address the aforementioned technical problems, this utility model provides an IRCUT lens for coil protection, thereby solving the problem that the coil in existing IRCUT lenses is prone to burnout during use.
[0005] This utility model embodiment provides an IRCUT lens for coil protection, which is installed inside a surveillance camera. The IRCUT lens includes a housing, and a circuit board is provided inside the housing. The circuit board integrates a coil protection switching circuit, which is connected to the IRCUT lens.
[0006] The coil protection switching circuit controls the energization status of the coil ends of the IRCUT lens according to the light intensity, collects the voltage at both ends of the coil in real time, and resets or shuts off the power when the voltage is abnormal.
[0007] Optionally, in the IRCUT lens for coil protection, the coil protection switching circuit includes a main control module, a drive module, and an interface module; the main control module is connected to the drive module and the interface module, and the interface module is connected to the drive module and the coil of the IRCUT lens;
[0008] After the main control module is powered on, it controls the drive module to output positive and negative voltages according to the light intensity, and transmits them to the two ends of the coil of the IRCUT lens through the interface module.
[0009] The interface module collects the voltage across the coil in real time and feeds it back to the main control module. When the main control module detects an abnormal voltage across the coil, it controls the drive module to reset or shut down.
[0010] Optionally, in the IRCUT lens for coil protection, the main control module includes a main control chip, two control pins of the main control chip are connected to a drive module, and two detection pins of the main control chip are connected to an interface module.
[0011] Optionally, in the IRCUT lens for coil protection, the two control pins are PWM0_SSI1_DT_PB17 and PWM1_SSI1_DR_PB18, and the two detection pins are SMB1_SDA_SSI1_CE0_PB25 and SMB1_SCK_SSI1_CLK_PB26.
[0012] Optionally, in the IRCUT lens for coil protection, the driving module includes a driving chip, the GND pin of the driving chip is grounded, the Aout pin and Bout pin of the driving chip are both connected to the interface module, and the VCC pin of the driving chip is connected to the power supply terminal; the AIN pin and BIN pin of the driving chip are connected one-to-one with the PWM0_SSI1_DT_PB17 pin and PWM1_SSI1_DR_PB18 pin of the main control chip.
[0013] Optionally, in the IRCUT lens for coil protection, the driving module further includes a first capacitor, a second capacitor, and a third capacitor;
[0014] The first capacitor is connected between the AIN pin of the driver chip and ground, the second capacitor is connected between the BIN pin of the driver chip and ground, and the third capacitor is connected between the VCC pin of the driver chip and ground.
[0015] Optionally, in the IRCUT lens for coil protection, the interface module includes a lens mount, a first resistor, a second resistor, a fourth capacitor, and a fifth capacitor.
[0016] The lens mount is connected to a wired IRCUT lens; pin 1 of the lens mount is connected to one end of the first resistor, one end of the fourth capacitor, and pin SMB1_SDA_SSI1_CE0_PB25 of the main control chip; pin 2 of the lens mount is connected to one end of the second resistor, one end of the fifth capacitor, and pin SMB1_SCK_SSI1_CLK_PB26 of the main control chip; the other end of the first resistor is connected to pin Aout of the driver chip, the other end of the second resistor is connected to pin Bout of the driver chip, and the other ends of the fourth and fifth capacitors are both grounded.
[0017] In the technical solution provided by this utility model embodiment, an IRCUT lens for coil protection is installed inside a surveillance camera. The IRCUT lens includes a housing, and a circuit board is disposed inside the housing. The circuit board integrates a coil protection switching circuit, which is connected to the IRCUT lens. The coil protection switching circuit controls the energization state of the coil ends of the IRCUT lens according to the light intensity, collects the voltage across the coil ends in real time, and resets or shuts off the power supply when the voltage is abnormal. It can automatically detect the voltage across the coil ends inside the IRCUT lens, and reduce or suspend the power supply to the coil after detecting an abnormality, preventing the coil inside the IRCUT lens from burning out, thereby solving the problem that the coil inside existing IRCUT lenses is prone to burning out during use. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of the IRCUT lens used for coil protection in an embodiment of this utility model.
[0019] Figure 2 This is a circuit diagram of the main control module in an embodiment of this utility model.
[0020] Figure 3 This is a circuit diagram of the driving module in an embodiment of the present invention.
[0021] Figure 4 This is a circuit diagram of the interface module in an embodiment of this utility model. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments of the present utility model obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.
[0023] It is readily understood that relational terms such as "first" and "second" are used merely to distinguish one entity, operation, or direction from another, without requiring or implying any actual relationship or order between these entities, operations, or directions. The directional terms such as "up," "down," "left," "right," "front," "back," "front," "back," "top," and "bottom," mentioned or possibly used in this specification, are defined relative to the constructions shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be construed as restrictive. In the following description, various parameters and components are described for embodiments of different constructions. These specific parameters and components are merely examples and do not limit the embodiments of this application.
[0024] Please see Figure 1 The IRCUT lens for coil protection provided in this embodiment is installed inside a surveillance camera. The IRCUT lens includes a housing and a circuit board inside the housing. The circuit board integrates a coil protection switching circuit, which is connected to the IRCUT lens. The coil protection switching circuit controls the energization state of the coil ends of the IRCUT lens according to the light intensity, collects the voltage at the coil ends in real time, and resets or shuts off the power supply when the voltage is abnormal (including voltage greater than a threshold and duration exceeding a preset time).
[0025] In this embodiment, the coil protection switching circuit includes a main control module 10, a drive module 20, and an interface module 30. The main control module 10 is connected to the drive module 20 and the interface module 30, and the interface module 30 is connected to the drive module 20 and the coil of the IRCUT lens. After the main control module 10 is powered on, it controls the drive module 20 to output positive and negative voltages according to the light intensity, which are transmitted to the two ends of the coil of the IRCUT lens through the interface module 30. The filter can be switched when the coil is powered on. The interface module 30 collects the voltage at both ends of the coil in real time and feeds it back to the main control module 10. When the main control module 10 detects an abnormal voltage at both ends of the coil, it controls the drive module 20 to reset (i.e., restart, the current pauses and then resumes, which is equivalent to reducing the current) or shut down (no positive or negative voltage output).
[0026] It can automatically detect the voltage across the coil inside the IRCUT lens, and reduce or stop the power supply to the coil after detecting an abnormality to prevent the coil inside the IRCUT lens from burning out, thereby solving the problem of reddish images and preventing fires.
[0027] Please continue reading. Figure 2The main control module 10 includes a main control chip U1. The two control pins of the main control chip U1 (specifically, pins PWM0_SSI1_DT_PB17 and PWM1_SSI1_DR_PB18) are connected to the drive module 20, and the two detection pins of the main control chip U1 (specifically, pins SMB1_SDA_SSI1_CE0_PB25 and SMB1_SCK_SSI1_CLK_PB26) are connected to the interface module 30.
[0028] The main control chip U1 is a commonly used main control SOC (System-on-a-Chip) in IRCUT lenses, such as the T32 series. This embodiment mainly describes the improved connection method; the connections of other pins and peripheral devices of the chip are existing technologies and will not be detailed here. Two control signals (A_IRCUTP and A_IRCUTN signals) are output through two control pins (GPIO ports) to control the on / off state of the driver chip in the driver module 20. The interface module 30 transmits the voltage signals (V_IRCUTP and V_IRCUTN signals) across the coil to the main control chip U1 for detection through two detection pins (ADC pins). When the main control chip U1 determines that the voltage across the coil is greater than 3.3V and the duration exceeds 1 minute based on the two voltage signals, the main control chip U1 outputs a corresponding level control signal to control the driver chip to reset.
[0029] like Figure 3 As shown, the drive module 20 includes a drive chip U2. The GND pin of the drive chip U2 is grounded. The Aout and Bout pins of the drive chip U2 are both connected to the interface module 30. The VCC pin of the drive chip U2 is connected to the power supply terminal (providing +5V voltage). The AIN and BIN pins of the drive chip U2 are connected one-to-one with the PWM0_SSI1_DT_PB17 and PWM1_SSI1_DR_PB18 pins of the main control chip U1.
[0030] The preferred model of the driver chip U2 is SA6208L. The A_IRCUTP and A_IRCUTN signals output by the main control chip U1 control the driver chip U2 to turn on or off. When the driver chip U2 is on, it outputs the corresponding positive voltage signal IRCUTP and negative voltage signal (or ground potential) IRCUTN, which are transmitted to the two ends of the coil through the interface module 30. The magnetic field generated by the instantaneous current on the coil controls the switching of the infrared cutoff filter through the existing pendulum. When the driver chip U2 is off, there is no output of the positive voltage signal IRCUTP and the negative voltage signal IRCUTN, and there is no voltage at the two ends of the coil, so the pendulum maintains its current state. When the infrared cutoff filter needs to be switched again, the coil is energized again to switch it.
[0031] Preferably, the driving module 20 further includes a first capacitor C1, a second capacitor C2, and a third capacitor C3; the first capacitor C1 is connected between the AIN pin of the driving chip U2 and ground, the second capacitor C2 is connected between the BIN pin of the driving chip U2 and ground, and the third capacitor C3 is connected between the VCC pin of the driving chip U2 and ground. C1 and C2 are filter capacitors, preferably 1uF / 16V (capacitance / voltage), used to filter the signals on the connected pins, as well as filter out interference on the circuit board and environmental interference, improving product stability and enhancing signal integrity. C3 is a power supply stabilizing capacitor, preferably 0.1uF / 16V, to enhance power supply stability.
[0032] like Figure 4 As shown, the interface module 30 includes a lens mount J1, a first resistor R1, a second resistor R2, a fourth capacitor C4, and a fifth capacitor C5. The lens mount J1 is externally connected to a wired IRCUT lens. Pin 1 of the lens mount J1 is connected to one end of the first resistor R1, one end of the fourth capacitor C4, and pin SMB1_SDA_SSI1_CE0_PB25 of the main control chip U1. Pin 2 of the lens mount J1 is connected to one end of the second resistor R2, one end of the fifth capacitor C5, and pin SMB1_SCK_SSI1_CLK_PB26 of the main control chip U1. The other end of the first resistor R1 is connected to pin Aout of the driver chip U2, the other end of the second resistor R2 is connected to pin Bout of the driver chip U2, and the other ends of the fourth capacitor C4 and the fifth capacitor C5 are both grounded.
[0033] The lens mount J1 is for connecting a wired IRCUT lens; the lens can be directly inserted into this mount. C4 and C5 are preferably 1uF / 16V, and R1 and R2 are preferably 1KΩ. R1 and C4, and R2 and C5 form two sets of low-pass filter circuits to filter out high-frequency signals and environmental interference on the circuit board, improving product stability and enhancing signal integrity. The positive voltage signal IRCUTP and negative voltage signal IRCUTN output by the driver chip U2 are filtered by the low-pass filter circuit and then transmitted to both ends of the coil through J1, energizing the coil. The lens mount J1 also collects the voltage across the coil in real time and outputs corresponding voltage signals (V_IRCUTP signal and V_IRCUTN signal) to the main control chip U1 for detection and judgment. When the voltage is greater than the threshold (e.g., 3.3V) and the duration exceeds the preset time (e.g., 1 minute), the main control chip U1 outputs control signals of corresponding levels from the two control pins to reset the driver chip or shut down the driver chip U2. This can prevent image effect problems or fires caused by overheating and burning of the coil.
[0034] In summary, the IRCUT lens for coil protection provided by this utility model detects the voltage across the coil inside the IRCUT lens. When the voltage magnitude and duration exceed the limit, the driver chip is reset or turned off, and the power supply to the coil is reduced or suspended. This prevents the coil inside the IRCUT lens from being burned out by a large current, thereby solving the problem of reddish images and preventing fires.
[0035] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. An IRCUT lens for coil protection, installed inside a surveillance camera, characterized in that, The IRCUT lens includes a housing, inside which is a circuit board. The circuit board integrates a coil protection switching circuit, which is connected to the IRCUT lens. The coil protection switching circuit controls the energization status of the coil ends of the IRCUT lens according to the light intensity, collects the voltage at both ends of the coil in real time, and resets or shuts off the power when the voltage is abnormal.
2. The IRCUT lens for coil protection according to claim 1, characterized in that, The coil protection switching circuit includes a main control module, a drive module, and an interface module; the main control module is connected to the drive module and the interface module, and the interface module is connected to the drive module and the coil of the IRCUT lens; After the main control module is powered on, it controls the drive module to output positive and negative voltages according to the light intensity, and transmits them to the two ends of the coil of the IRCUT lens through the interface module. The interface module collects the voltage across the coil in real time and feeds it back to the main control module. When the main control module detects an abnormal voltage across the coil, it controls the drive module to reset or shut down.
3. The IRCUT lens for coil protection according to claim 2, characterized in that, The main control module includes a main control chip, two control pins of which are connected to a driver module, and two detection pins of which are connected to an interface module.
4. The IRCUT lens for coil protection according to claim 3, characterized in that, The two control pins are PWM0_SSI1_DT_PB17 and PWM1_SSI1_DR_PB18, and the two detection pins are SMB1_SDA_SSI1_CE0_PB25 and SMB1_SCK_SSI1_CLK_PB26.
5. The IRCUT lens for coil protection according to claim 4, characterized in that, The driving module includes a driving chip. The GND pin of the driving chip is grounded. The Aout and Bout pins of the driving chip are both connected to the interface module. The VCC pin of the driving chip is connected to the power supply terminal. The AIN and BIN pins of the driving chip are connected one-to-one with the PWM0_SSI1_DT_PB17 and PWM1_SSI1_DR_PB18 pins of the main control chip.
6. The IRCUT lens for coil protection according to claim 5, characterized in that, The driving module also includes a first capacitor, a second capacitor, and a third capacitor; The first capacitor is connected between the AIN pin of the driver chip and ground, the second capacitor is connected between the BIN pin of the driver chip and ground, and the third capacitor is connected between the VCC pin of the driver chip and ground.
7. The IRCUT lens for coil protection according to claim 5, characterized in that, The interface module includes a lens mount, a first resistor, a second resistor, a fourth capacitor, and a fifth capacitor; The lens mount is connected to a wired IRCUT lens; pin 1 of the lens mount is connected to one end of the first resistor, one end of the fourth capacitor, and pin SMB1_SDA_SSI1_CE0_PB25 of the main control chip; pin 2 of the lens mount is connected to one end of the second resistor, one end of the fifth capacitor, and pin SMB1_SCK_SSI1_CLK_PB26 of the main control chip; the other end of the first resistor is connected to pin Aout of the driver chip, the other end of the second resistor is connected to pin Bout of the driver chip, and the other ends of the fourth and fifth capacitors are both grounded.