A core mirror integrated anti-glare system

Abstract

The application discloses a kind of core mirror integration anti-glare systems, including light sensor module, for converting ambient light signal into illuminance value by IIC digital signal transmission to integrated control module;Integrated control module receives the digital signal of the light sensor module, according to preset threshold and control strategy respectively generates anti-glare control signal for rearview mirror;Rearview mirror output module is controlled by the integrated control module, when meeting opening condition, anti-glare driving voltage is applied to corresponding rearview mirror, the present application is completely retained on the premise of existing automatic anti-glare function, by highly integrated circuit design, the multi-chip architecture scattered in traditional scheme is integrated into single main control IC, cooperates with optimized MOS drive topology, realizes PCB layout area reduction 40% or more, achieves the design of thin structure.

Description

Technical Field

[0001] This invention relates to the field of anti-glare systems, and in particular to an integrated anti-glare system for a lens and core. Background Technology

[0002] Car rearview mirrors are located on the left and right sides of the front of the car and in front of the interior of the car. They are used to reflect the situation behind, to the sides and below the car, so that the driver can indirectly see the situation in these positions and expand the driver's field of vision.

[0003] The automatic anti-glare function of car rearview mirrors means that when driving at night, when the headlights of the car behind shine on the rearview mirror, the rearview mirror can automatically reduce its reflectivity according to the light intensity, thereby reducing the "glare" caused to the driver by the glare of the headlights.

[0004] Existing technical solutions require at least three IC components (including one power IC and two or more control ICs), and the PCB board area is more than 50 square centimeters. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the technical problem to be solved by the present invention is the complexity of the existing anti-glare overall circuit topology.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an integrated anti-glare system for a lens and core, comprising a light sensor module for converting ambient light signals into illuminance values ​​and transmitting them to an integrated control module via an IIC digital signal;

[0008] An integrated control module receives digital signals from the light sensor module and generates anti-glare control signals for the rearview mirror according to preset thresholds and control strategies.

[0009] The rearview mirror output module, controlled by the integrated control module, applies an anti-glare driving voltage to the corresponding rearview mirror when the activation conditions are met.

[0010] As a preferred embodiment of the integrated anti-glare system of the core and lens described in this invention, the support frame is further provided with a second fixing hole on its side, the position of which corresponds to the position of the first fixing hole.

[0011] As a preferred embodiment of the integrated anti-glare system of the core and lens described in this invention, the preset threshold refers to the target anti-glare level calculated based on the illuminance value, thereby confirming whether to output a signal to activate the driving voltage.

[0012] As a preferred embodiment of the integrated anti-glare system of the core and mirror described in this invention, the control strategy refers to the following: when the signal of the output driving voltage is turned on, EC_N_K and EC_W_K output a high level to the rearview mirror output module, and the rearview mirror output module outputs an average voltage of 0~1.2V to turn on the anti-glare function of the rearview mirror.

[0013] As a preferred embodiment of the integrated anti-glare system of the lens and core of the present invention, the integrated control module provides a 3.3V sensor power supply and an SWDIO / SWCLK program download interface.

[0014] As a preferred embodiment of the integrated anti-glare system of the core and lens described in this invention, the light sensor module includes an ambient light sensor module and a glare sensor module. The ambient light sensor module is used to collect ambient light signals around the vehicle / inside the vehicle and generate an ambient light illuminance value. The glare sensor module is used to collect ambient light signals from a light source behind the vehicle and generate a glare illuminance value.

[0015] As a preferred embodiment of the integrated anti-glare system of the present invention, the rearview mirror output module includes an inner rearview mirror output module and an outer rearview mirror output module. The inner rearview mirror output module is used to output a driving voltage EC_N to the electrochromic lens of the inner rearview mirror to activate the anti-glare system, based on the target anti-glare level determined by the integrated control module, when EC_N_K is valid and the activation condition is met. The outer rearview mirror output module is used to output a driving voltage EC_W to the electrochromic lens of the outer rearview mirror to activate the anti-glare system, based on the target anti-glare level, when EC_W_K is valid and the activation condition is met.

[0016] As a preferred embodiment of the integrated anti-glare system for the lens and core of the present invention, it further includes a LIN communication input module for connecting to the vehicle's LIN bus.

[0017] As a preferred embodiment of the integrated anti-glare system for the lens and core of the present invention, it further includes a power input module for supplying power to the system.

[0018] As a preferred embodiment of the integrated anti-glare system of the core and lens described in this invention, the outputs of the ambient light sensor module and the glare sensor module are connected to the integrated control module via the IIC bus, and each is provided with a pull-up resistor and a filter capacitor.

[0019] As a preferred embodiment of the integrated anti-glare system of the endoscope described in this invention, the endoscope output module is composed of a cascaded transistor and a MOSFET controlled by EC_N_K, and outputs EC_N to the EC endoscope after being filtered by multiple capacitors.

[0020] The external rearview mirror output module is composed of a cascaded transistor and MOSFET controlled by EC_W_K, and is output to the EC external mirror after being filtered by multiple stages of capacitors. An abnormal voltage and overload protection branch composed of a fuse, transistor, diode and resistor is set at the EC external mirror end.

[0021] As a preferred embodiment of the integrated anti-glare system for the lens and core of the present invention, the abnormal voltage and overload protection branch includes,

[0022] A fuse connected in series between the EC_W output terminal and the EC external mirror is used for current limiting / blowing in case of short circuit or overload;

[0023] A resistor network is used to detect the output current / voltage, which forms a detection potential across the fuse or at the EC_W output terminal;

[0024] A transistor, whose base is connected to the detection potential via a current-limiting resistor, whose emitter is grounded, and whose collector is electrically connected to the output terminal of EC_W, conducts when the detection potential exceeds a predetermined threshold to quickly pull down or bypass the output terminal of EC_W, thereby cutting off / limiting the fault current.

[0025] And a diode device connected in parallel with the output of the EC_W, including at least a protection diode for reverse voltage bypass and / or a Zener diode for surge and overvoltage clamping.

[0026] The beneficial effects of this invention are: while fully retaining the existing automatic anti-glare function, through highly integrated circuit design, the scattered multi-chip architecture in the traditional solution is integrated into a single main control IC, and with the optimized MOS drive topology, the PCB layout area is reduced by more than 40%, achieving a thin structure design. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram of an integrated anti-glare system for a lens and core module according to an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the power input module circuit in an integrated anti-glare system for a lens and core as described in one embodiment of the present invention;

[0030] Figure 3 A schematic diagram of the LIN communication module circuit in an integrated anti-glare system for lens and core as described in one embodiment of the present invention;

[0031] Figure 4 A schematic diagram of the ambient light sensor circuit in the integrated anti-glare system of the lens and core as described in one embodiment of the present invention;

[0032] Figure 5 A schematic diagram of the glare sensor circuit in the integrated anti-glare system of the lens and core as described in one embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the integrated control module circuit in an integrated anti-glare system for a lens as described in one embodiment of the present invention.

[0034] Figure 7 This is a schematic diagram of the inner rearview mirror drive circuit in an integrated anti-glare system according to an embodiment of the present invention.

[0035] Figure 8 This is a schematic diagram of the external rearview mirror drive circuit in an integrated anti-glare system according to an embodiment of the present invention. Detailed Implementation

[0036] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0037] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0038] Secondly, the present invention will be described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure will be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0039] Furthermore, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments.

[0040] Example 1

[0041] Reference Figures 1-8This embodiment provides an integrated anti-glare system for both the mirror and the rearview mirror, including a light sensor module 100, an integrated control module 200, a rearview mirror output module 300, a LIN communication input module 400, and a power input module 500.

[0042] The light sensor module 100 further includes an ambient light sensor module 101 and a glare sensor module 102; the rearview mirror output module 300 further includes an interior rearview mirror output module 301 and an exterior rearview mirror output module 302.

[0043] The ambient light sensor module 101 is used to collect ambient light signals around / inside the vehicle and generate ambient light illuminance values; the glare sensor module 102 is used to collect ambient light signals from the light source behind the vehicle and generate glare illuminance values; the digital outputs of both are sent to the integrated control module 200 via the IIC bus, and pull-up resistors and filter capacitors are configured respectively to ensure signal stability.

[0044] It receives IIC digital signals from the light sensor module 100; calculates the target anti-glare level according to a preset threshold, and decides whether to output a signal to enable the drive voltage accordingly; when anti-glare needs to be enabled, it outputs EC_N_K and EC_W_K high levels to the rearview mirror output module 300; it provides a 3.3V sensor power supply and a SWDIO / SWCLK program download interface; where EC_N_K = EC for endoscope anti-glare function enabled, and EC_W_K = EC for exoscope anti-glare function enabled.

[0045] Furthermore, reasonable constraints are imposed on the collected ambient light illuminance and glare illuminance values. Negative values ​​are set to 0, and abnormally large values ​​are clamped to the upper limit of the sensor's range to ensure that no negative or abnormally large values ​​appear, thus avoiding algorithm crashes due to momentary sensor malfunctions. A three-frame median filter is used, which selects the median value from the current frame, the previous frame, and the two frames before that as the effective input for the current frame, to obtain the denoised ambient light illuminance value. and glare illuminance value The signal was then processed using a first-order IIR low-pass filter to stabilize it, resulting in a smoothed ambient light illuminance value. and glare illuminance value , is represented as:

[0046] ;

[0047] ;

[0048] in, The smoothing coefficient (dimensionless, value range 0 < 0) <1), Smaller output values ​​indicate greater stability and a more conservative approach to new data. The larger the output, the more "sensitive" it is, and the faster it can follow new data; , This is the smoothed result of the previous frame. This is the frame number.

[0049] Based on the fact that the human eye responds logarithmically to changes in light intensity, illuminance is converted into logarithmic values, generating logarithmic values ​​for ambient light illuminance and glare illuminance. Using these logarithmic values, a linear combination is employed to calculate the intensity of glare relative to ambient light, yielding the glare intensity. , is represented as ,

[0050] ;

[0051] in, This is the logarithmic value of ambient illuminance. This is the logarithmic value of glare illuminance; This is the ambient light weighting coefficient; This refers to the ambient light intensity value. This refers to the glare illuminance value. This is the bias constant.

[0052] It should be noted that when the glare illuminance increases while the ambient light illuminance decreases, Increase; under strong sunlight (high ambient illuminance value), the logarithmic value of ambient illuminance is relatively large, making... Weakened.

[0053] Set an effective lower limit for glare, if If the value is less than 20 lux, the target's anti-glare level is directly determined to be... (It is believed that there is no effective glare);

[0054] It should be noted that setting 20 lux as the effective lower limit of glare is mainly based on a combination of the human eye's perception threshold for glare at night (usually between 10 and 30 lux), the noise interference that light sensors are prone to generate in low-light ranges, and the fact that common light sources such as distant taillights and reflective markings in actual car nighttime scenarios are usually below 20 lux and insufficient to cause significant glare. Therefore, taking 20 lux as the threshold value can effectively prevent weak light sources or noise from falsely triggering darkening, while ensuring that strong light that may actually cause glare can be identified and processed.

[0055] Preset a set of uplink and downlink thresholds:

[0056] Uplink threshold =[0.15,0.40,0.65,0.95,1.20](corresponding to) 1…5);

[0057] Downlink threshold =[0.10,0.35,0.60,0.90,1.15];

[0058] The target anti-glare level is determined by progressively judging based on glare intensity and uplink / downlink thresholds. , specifically

[0059] If the previous frame and ,but ,otherwise ;

[0060] If the previous frame :when hour, ;when hour, ;otherwise =k;

[0061] If the previous frame and ,but ,otherwise .

[0062] in, The anti-glare level of the target in the previous frame. For the first The uplink threshold of the level, For the first The downlink threshold of the level, The index for the anti-glare level of the target is between 1 and 4;

[0063] For example: the previous frame This frame ,because (=0.65), thus obtaining .

[0064] It should be noted that different boundaries are used for upward and downward movements, which can keep small fluctuations within the range and avoid frequent switching between light and dark.

[0065] Furthermore, based on the target anti-glare level, determine whether to output a signal to enable the drive voltage and provide the voltage nominal value. Specifically, set the enabling conditions: Turn on;

[0066] If true, set EC_N_K=1 and EC_W_K=1, and calculate the target voltage VEC=0.24× (Unit: V, (∈{0,1,2,3,4,5}), input to the rearview mirror output module 300 to generate the corresponding 0~1.2V average voltage and apply it to EC_N / EC_W;

[0067] If not, that is If so, then EC_N_K / EC_W_K will be reset to zero, and the EC lens will remain in normal condition.

[0068] To further stabilize the image, if an opening occurs in this frame... When the K or H level changes, the level is latched for 1 second (5-10 frames) and the level is not re-evaluated, thus forming the final control of the rearview mirror output module 300.

[0069] When EC_N_K is valid and the activation conditions are met, the interior rearview mirror output module 301 outputs a driving voltage EC_N to the electrochromic lens of the interior rearview mirror to activate the anti-glare function, based on the target anti-glare level determined by the integrated control module 200. Its circuit is composed of a cascaded transistor and MOSFET controlled by EC_N_K, and is output to the EC endoscope after being filtered by multiple capacitors.

[0070] When EC_W_K is valid and the activation conditions are met, the exterior rearview mirror output module 302 outputs a driving voltage EC_W to the electrochromic lens of the exterior rearview mirror to activate the anti-glare function, based on the target anti-glare level. Its circuit is composed of a cascaded transistor and MOSFET controlled by EC_W_K, and is output to the EC exterior mirror after being filtered by multiple capacitors.

[0071] Simultaneously, abnormal voltage and overload protection branches are installed at the EC external end, including:

[0072] A fuse connected in series between the EC_W output terminal and the EC external mirror is used for current limiting / blowing in case of short circuit or overload;

[0073] A resistor network is used to detect the output current / voltage, which forms a detection potential across the fuse or at the EC_W output terminal;

[0074] A transistor, whose base is connected to the detection potential via a current-limiting resistor, whose emitter is grounded, and whose collector is electrically connected to the output terminal of EC_W, conducts when the detection potential exceeds a predetermined threshold to quickly pull down or bypass the output terminal of EC_W, thereby cutting off / limiting the fault current.

[0075] The diode device connected in parallel with the output terminal of EC_W includes at least a protection diode for reverse voltage bypass and / or a Zener diode (TVS) for surge and overvoltage clamping.

[0076] The power input module 500 supplies power to all modules of the system; the light sensor module 100 is electrically connected to the integrated control module 200 via the IIC bus, wherein the outputs of the ambient light sensor module 101 and the glare sensor module 102 are both transmitted via the IIC bus, and each has a pull-up resistor and a filter capacitor; the integrated control module 200 outputs EC_N_K and EC_W_K to the rearview mirror output module 300; the interior rearview mirror output module 301 outputs a driving voltage EC_N to the electrochromic lens of the interior rearview mirror, and the exterior rearview mirror output module 302 outputs a driving voltage EC_W to the electrochromic lens of the exterior rearview mirror; the LIN communication input module 400 is connected to the vehicle's LIN bus.

[0077] The working principle is as follows:

[0078] Step S1: Ambient light sensor module 101 collects ambient light signals from the vehicle's surroundings / inside the vehicle and generates ambient light illuminance values; glare sensor module 102 collects ambient light signals from a light source behind the vehicle and generates glare illuminance values. Both illuminance values ​​are transmitted to the integrated control module 200 as IIC digital signals.

[0079] Step S2: The integrated control module 200 calculates the target anti-glare level based on the preset threshold and confirms whether to output a signal to turn on the drive voltage.

[0080] Step S3: When the activation conditions are met, the integrated control module 200 outputs a high level to the rearview mirror output module 300 via EC_N_K and / or EC_W_K; the inner rearview mirror output module 301 and the outer rearview mirror output module 302 respectively output an average voltage of 0-1.2V as EC_N and EC_W, thereby activating the anti-glare function of the corresponding rearview mirror. When the activation conditions are not met, EC_N_K and EC_W_K are not enabled, and the rearview mirror remains in normal operation.

[0081] Step S4: The integrated control module 200 simultaneously provides 3.3V sensor power to power the optical sensor module 100, and realizes program download and debugging through the SWDIO / SWCLK interface.

[0082] Through the above structure and working process, this embodiment achieves the following effects without limiting the specific component models and values:

[0083] Target anti-glare level determination and power control based on preset thresholds;

[0084] When enabled, the interior / exterior rearview mirrors receive an average voltage of 0–1.2V to activate the anti-glare function;

[0085] The exterior rearview mirror channel has abnormal voltage and overload protection capabilities, improving system reliability;

[0086] The optical sensor module 100 is powered by the integrated control module 200 at 3.3V and communicates digitally via IIC, which facilitates system integration.

[0087] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0088] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0089] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0090] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An integrated anti-glare system for a lens and core, characterized in that: include, A light sensor module (100) is used to convert ambient light signals into illuminance values ​​and transmit them to the integrated control module (200) via IIC digital signals. An integrated control module (200) receives digital signals from the light sensor module (100) and generates anti-glare control signals for the rearview mirror according to a preset threshold and control strategy. The rearview mirror output module (300), controlled by the integrated control module (200), applies an anti-glare driving voltage to the corresponding rearview mirror when the opening conditions are met; Illuminance values ​​are converted to logarithmic values ​​to generate logarithmic values ​​for ambient light illuminance and glare illuminance. Based on these logarithmic values, a linear combination is used to calculate the intensity of glare relative to ambient light, thus obtaining the glare intensity. , is represented as , ； in, This is the logarithmic value of ambient illuminance. This is the logarithmic value of glare illuminance; This is the ambient light weighting coefficient; This refers to the ambient light intensity value. This refers to the glare illuminance value. This is the bias constant; Preset a set of uplink and downlink thresholds: Uplink threshold =[0.15,0.40,0.65,0.95,1.20]; Downlink threshold =[0.10,0.35,0.60,0.90,1.15]; The target anti-glare level is determined by progressively judging based on glare intensity and uplink / downlink thresholds. Specifically: If the previous frame and ,but ,otherwise ; If the previous frame :when hour, ;when hour, ;otherwise =k; If the previous frame and ,but ,otherwise ; in, The anti-glare level of the target in the previous frame. For the first The uplink threshold of the level, For the first The downlink threshold of the level, Index of target anti-glare level between 1 and 4.

2. The integrated anti-glare system for the lens and core as described in claim 1, characterized in that: The preset threshold refers to the target anti-glare level calculated based on the illuminance value, thereby confirming whether to output a signal to turn on the driving voltage.

3. The integrated anti-glare system for the lens and core as described in claim 1 or 2, characterized in that: The control strategy refers to the following: when the signal to turn on the drive voltage is output, EC_N_K and EC_W_K output a high level to the rearview mirror output module (300), and the rearview mirror output module (300) outputs an average voltage of 0~1.2V to enable the anti-glare function of the rearview mirror.

4. The integrated anti-glare system for the lens and core as described in claim 3, characterized in that: The integrated control module provides a 3.3V sensor power supply and an SWDIO / SWCLK program download interface.

5. The integrated anti-glare system for the lens and core as described in claim 4, characterized in that: The light sensor module (100) includes an ambient light sensor module (101) and a glare sensor module (102). The ambient light sensor module (101) is used to collect ambient light signals around the vehicle / inside the vehicle and generate ambient light illuminance values. The glare sensor module (102) is used to collect ambient light signals from a light source behind the vehicle and generate glare illuminance values.

6. The integrated anti-glare system for the lens and core as described in claim 5, characterized in that: The rearview mirror output module (300) includes an interior rearview mirror output module (301) and an exterior rearview mirror output module (302). The interior rearview mirror output module (301) is used to output a driving voltage EC_N to the electrochromic lens of the interior rearview mirror to activate anti-glare, based on the target anti-glare level determined by the integrated control module (200) when EC_N_K is valid and the activation condition is met. The exterior rearview mirror output module (302) is used to output a driving voltage EC_W to the electrochromic lens of the exterior rearview mirror to activate anti-glare, based on the target anti-glare level, when EC_W_K is valid and the activation condition is met.

7. The integrated anti-glare system for the lens and core as described in claim 6, characterized in that: It also includes a LIN communication input module (400) for connecting to the vehicle's LIN bus.

8. The integrated anti-glare system for the lens and core as described in claim 7, characterized in that: It also includes a power input module (500) for supplying power to the system.

9. The integrated anti-glare system for the lens and core as described in claim 8, characterized in that: The outputs of the ambient light sensor module (101) and the glare sensor module (102) are connected to the integrated control module via the IIC bus, and each is equipped with a pull-up resistor and a filter capacitor.

10. The integrated anti-glare system for the lens and core as described in claim 8 or 9, characterized in that: The rearview mirror output module (301) is composed of a cascaded transistor and MOSFET controlled by EC_N_K, and outputs EC_N to the EC endoscope after being filtered by multiple capacitors. The external rearview mirror output module (302) is composed of a cascaded transistor and MOSFET controlled by EC_W_K, and is output to the EC external mirror after being filtered by multiple capacitors. An abnormal voltage and overload protection branch composed of a fuse, transistor, diode and resistor is set at the EC external mirror end.

11. The integrated anti-glare system for the lens and core as described in claim 10, characterized in that: The abnormal voltage and overload protection branch includes, A fuse connected in series between the EC_W output terminal and the EC external mirror is used for current limiting / blowing in case of short circuit or overload; A resistor network is used to detect the output current / voltage, which forms a detection potential across the fuse or at the EC_W output terminal; A transistor, whose base is connected to the detection potential via a current-limiting resistor, whose emitter is grounded, and whose collector is electrically connected to the output terminal of EC_W, conducts when the detection potential exceeds a predetermined threshold to quickly pull down or bypass the output terminal of EC_W, thereby cutting off / limiting the fault current. And a diode device connected in parallel with the output of the EC_W, including at least a protection diode for reverse voltage bypass and / or a Zener diode for surge and overvoltage clamping.

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