CN113219293B - Optical accessory detection circuit and lighting equipment - Google Patents
Optical accessory detection circuit and lighting equipment Download PDFInfo
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- CN113219293B CN113219293B CN202110770424.6A CN202110770424A CN113219293B CN 113219293 B CN113219293 B CN 113219293B CN 202110770424 A CN202110770424 A CN 202110770424A CN 113219293 B CN113219293 B CN 113219293B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/06—Arrangement of electric circuit elements in or on lighting devices the elements being coupling devices, e.g. connectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V33/00—Structural combinations of lighting devices with other articles, not otherwise provided for
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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Abstract
An optical accessory detection circuit and lighting equipment belong to the field of lighting, and a resistance detection circuit is used for detecting a resistance attached to an optical accessory so as to output a resistance detection signal; wherein the resistances of the resistors on different optical accessories are different; the identification circuit compares the resistance detection signal with a plurality of reference voltages and generates a parallel identification signal according to a plurality of comparison results; the conversion circuit converts the parallel identification signal into a serial identification signal; the control circuit obtains the identification information of the optical accessory according to the serial identification signal; because the resistance values of the resistors corresponding to different optical accessories are different, different serial identification signals can be obtained by detecting the resistors, so that the identification information of the optical accessories can be identified, and the identification of the optical accessories is realized.
Description
Technical Field
The application belongs to the technical field of lighting, especially relates to an optical accessory detection circuit and lighting apparatus.
Background
In the process of shooting videos, short videos, advertisements and the like, a shot object or a scene is often required to be lighted, so that an additional lighting fixture (such as a Light Emitting Diode (LED) lighting device) is required to be lighted, and because the Light Emitting angle and the Light efficiency of the lighting fixture are limited by the Light source of the lighting fixture, an optical accessory such as a diffuser (box), a standard cover or a lens set is usually added in front of the Light source of the lighting fixture on the market at present to meet different lighting application scenes such as softening Light, mixing Light, changing the Light Emitting angle and the like.
However, the optical accessories are basically mechanically and detachably fixed to the front end of the light emitting direction, for example, a standard bayonets or the like are used, as names of accessories which may be well known to those skilled in the art, but as names of accessories which are not well known to those skilled in the art, or for devices (such as a lamp body, a control box connected to the lamp body, a mobile phone or a computer), various accessories cannot be accurately identified, especially in an actual shooting scene, the related accessories are often very complicated and numerous, some accessories have different desired model specifications, and different optical accessories affect optical parameters of a light source to different degrees, so identifying the optical accessories becomes a problem to be solved.
Disclosure of Invention
The application aims to provide an optical accessory detection circuit and lighting equipment, and aims to overcome the defect that the traditional lighting equipment cannot identify optical accessories.
An embodiment of the present application provides an optical accessory detection circuit, including:
a resistance detection circuit configured to detect a resistance attached to the optical accessory to output a resistance detection signal; wherein the resistances of the resistors on different optical accessories are different;
an identification circuit connected to the resistance detection circuit and configured to compare the resistance detection signal with a plurality of reference voltages and generate a parallel identification signal according to a plurality of comparison results;
a conversion circuit connected to the identification circuit and configured to convert the parallel identification signal into a serial identification signal;
and the control circuit is connected with the conversion circuit and is configured to obtain the identification information of the optical accessory according to the serial identification signal.
In one embodiment, the parallel identification signal comprises a plurality of sub-identification signals, the identification circuit comprises a plurality of comparison circuits;
the comparison circuit is connected with the resistance detection circuit and the conversion circuit, is configured to compare the resistance detection signal with one reference voltage, and generates one sub-identification signal according to a comparison result;
the reference voltages corresponding to different comparison circuits are different.
In one embodiment, the comparison circuit comprises an operational amplifier, a first capacitor, a first resistor, a second resistor and a third resistor;
the positive phase input end of the operational amplifier is connected with the first end of the first capacitor, the first end of the first resistor and the first end of the second resistor, the negative phase input end of the operational amplifier is used as the resistor detection signal input end of the comparison circuit, the output end of the operational amplifier and the first end of the third resistor are used as the sub-identification signal output end of the comparison circuit, the second end of the first capacitor and the second end of the second resistor are connected with a power ground in a shared mode, the second end of the first resistor is connected with a first power supply, and the second end of the third resistor R3 is connected with a second power supply.
In one embodiment, the parallel identification signal comprises a plurality of groups of sub-identification signals, the serial identification signal is a plurality of sub-identification signals, and the plurality of groups of sub-identification signals correspond to the plurality of serial identification signals in a one-to-one manner; the conversion circuit comprises a plurality of conversion components;
the conversion component is connected with the identification circuit and the control circuit and is configured to convert a group of the sub-identification signals into a serial identification signal.
In one embodiment, the conversion component comprises a parallel-in serial-out shift register, a second capacitor and a fourth resistor;
the first parallel data input end of the merging-and-serializing shift register, the second parallel data input end of the merging-and-serializing shift register, the third parallel data input end of the merging-and-serializing shift register, the fourth parallel data input end of the merging-and-serializing shift register, the fifth parallel data input end of the merging-and-serializing shift register, the sixth parallel data input end of the merging-and-serializing shift register, the seventh parallel data input end of the merging-and-serializing shift register and the eighth parallel data input end of the merging-and-serializing shift register are jointly used as a group of sub-identification signal input ends of the conversion component, the power supply end of the merging-and-serializing shift register and the first end of the second capacitor are jointly connected to a third power supply, and the clock enable input end of the merging-and-serializing shift register is connected with the first end of the fourth resistor, the asynchronous parallel loading input end of the merging and serial-out shift register is used as an enabling signal input end of the conversion component, the clock input end of the merging and serial-out shift register is used as a clock signal input end of the conversion component, the complementary serial signal output end of the merging and serial-out shift register is used as a serial identification signal output end of the conversion component, and the grounding end of the merging and serial-out shift register, the second end of the second capacitor and the second end of the fourth resistor are connected to a power ground in a shared mode.
In one embodiment, the resistance detection circuit comprises a connector, a fifth resistor and a sixth resistor;
the first end of the connector, the first end of the fifth resistor and the first end of the sixth resistor are connected to the resistor of the optical accessory and the resistor detection signal output end of the resistor detection circuit, the second end of the fifth resistor is connected with a fourth power supply, and the second end of the connector and the second end of the sixth resistor are connected with a power ground.
In one embodiment, the control circuit comprises a microprocessor;
the first general input-output end of the microprocessor is used as an enabling signal output end of the control circuit, the second general input-output end of the microprocessor is used as a clock signal output end of the control circuit, and the third general input-output end of the microprocessor and the fourth general input-output end of the microprocessor are used as serial identification signal input ends of the control circuit.
In one embodiment, the method further comprises the following steps:
an electrostatic protection circuit connected with the resistance detection circuit and the identification circuit and configured to suppress spike voltage in the resistance detection signal;
the identification circuit is specifically configured to compare the suppressed resistance detection signal with a plurality of reference voltages and to generate a parallel identification signal according to the comparison result.
In one embodiment, the electrostatic protection circuit includes a first TVS transistor, a third capacitor, and a fourth capacitor;
the first end of the first TVS tube, the first end of the third capacitor and the first end of the fourth capacitor are used as a resistance detection signal input end of the electrostatic protection circuit and a resistance detection signal output end of the electrostatic protection circuit, and the second end of the first TVS tube, the second end of the third capacitor and the second end of the fourth capacitor are connected to a power ground in a sharing mode.
The embodiment of the application also provides a lighting device, and the lighting device comprises the optical accessory detection circuit.
In one embodiment, the lighting device further comprises a housing, a plurality of contact sets, and a light source, wherein the optical accessory detection circuit and the light source are disposed within the housing, the contact sets are spaced around the light source, and the contact sets are connected in parallel with each other, wherein each contact set comprises a first contact and a second contact, wherein the first contact is electrically connected to a first end of the connector, the second contact is electrically connected to a second end of the connector, and the first contact and the second contact leak out at least partially from the housing.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: because the resistance values of the resistors on different optical accessories are different, different serial identification signals can be obtained by detecting the resistors and converting the resistors, so that the identification information of the optical accessories can be identified, and the identification of the optical accessories is realized.
Drawings
In order to more clearly illustrate the technical invention in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts.
FIG. 1 is a schematic diagram of an optical attachment detection circuit according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a comparison circuit in an optical attachment detection circuit according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of another configuration of a comparison circuit in an optical attachment detection circuit according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a switching circuit in an optical attachment detection circuit according to an embodiment of the present application;
FIG. 5 is a schematic diagram of another configuration of an optical attachment detection circuit according to an embodiment of the present application;
FIG. 6 is an exemplary circuit schematic of a comparison circuit in an optical attachment detection circuit according to one embodiment of the present application;
FIG. 7 is a schematic diagram of a portion of an exemplary circuit for an optical attachment detection circuit according to an embodiment of the present application;
FIG. 8 is a schematic diagram of another exemplary circuit portion of an optical attachment detection circuit according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of an illumination device according to an embodiment of the present application.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Fig. 1 shows a schematic structural diagram of an optical attachment detection circuit provided in a preferred embodiment of the present application, and for convenience of description, only the portions related to this embodiment are shown, and detailed descriptions are as follows:
the optical attachment detection circuit includes a resistance detection circuit 11, an identification circuit 12, a conversion circuit 13, and a control circuit 14.
A resistance detection circuit 11 configured to detect a resistance attached to the optical accessory to output a resistance detection signal; wherein the resistances of the resistors on different optical accessories are different; by way of example and not limitation, the resistor is attached to a surface of the optical accessory or to an interior of the optical accessory. The optical accessory can comprise a shading plate, a standard cover, a soft light box, a soft light cover, a soft light sheet, a focusing lens or a Fresnel lens and the like. The optical accessory may be fixed to the light exit face of the lighting device by a bayonette or the like.
And the identification circuit 12 is connected with the resistance detection circuit 11 and is configured to compare the resistance detection signal with a plurality of reference voltages and generate a parallel identification signal according to a plurality of comparison results.
A conversion circuit 13, connected to the identification circuit 12, configured to convert the parallel identification signal into a serial identification signal.
And a control circuit 14 connected with the conversion circuit 13 and configured to obtain the identification information of the optical accessory according to the serial identification signal.
The parallel identification signal includes a plurality of sub-identification signals, and as shown in fig. 2, the identification circuit 12 includes a plurality of comparison circuits 12i, such as comparison circuits 121, 122 … …, and the like; wherein, the number of the comparison circuits is n, and i is a natural number less than or equal to n.
A comparison circuit 12i connected to the resistance detection circuit 11 and the conversion circuit 13, configured to compare the resistance detection signal with a reference voltage, and generate a sub identification signal according to the comparison result; the reference voltages corresponding to different comparison circuits 12i are different. As shown in fig. 3, 16 comparison circuits 1-16 are shown, the 16 comparison circuits having a common input but each having a different reference voltage Vref.
Because the reference voltages corresponding to different comparison circuits 12i are different, identification of more optical accessories is realized by increasing the number of the comparison circuits 12i, and the number and the types of accessory detection are improved, so that detection of various optical accessories in film and television illumination is met.
The parallel identification signal comprises a plurality of groups of sub identification signals, the serial identification signals are a plurality of sub identification signals, and the plurality of groups of sub identification signals correspond to the serial identification signals one by one; as shown in fig. 3, the conversion circuit 13 includes a plurality of conversion elements 13j, such as conversion elements 131, 132 … …, and the like; wherein, the number of the conversion components is m, and j is a natural number less than or equal to m.
The conversion component 13j, connected to the identification circuit 12 and the control circuit 14, is configured to convert a set of sub-identification signals into a serial identification signal.
The parallel signal is converted into the serial signal by the conversion component 13j, so that the resource of a microprocessor port in the control circuit 14 is saved.
As shown in fig. 4, the optical attachment detection circuit further includes an electrostatic discharge protection circuit 15.
The electrostatic protection circuit 15 is connected to the resistance detection circuit 11 and the identification circuit 12, and configured to suppress a spike voltage in the resistance detection signal.
The identification circuit 12 is specifically configured to compare the post-suppression resistance detection signal with a plurality of reference voltages and generate a parallel identification signal according to the comparison result.
Fig. 5 shows an exemplary circuit configuration of a comparison circuit in an optical attachment detection circuit provided by an embodiment of the present invention, fig. 6 shows a partial exemplary circuit configuration of an optical attachment detection circuit provided by an embodiment of the present invention, fig. 7 shows another partial exemplary circuit configuration of an optical attachment detection circuit provided by an embodiment of the present invention, and for convenience of explanation, only the portions related to an embodiment of the present invention are shown, and the following detailed descriptions are provided:
the comparison circuit 12i includes an operational amplifier U1, a first capacitor C1, a first resistor R1, a second resistor R2, and a third resistor R3.
A non-inverting input terminal of the operational amplifier U1 is connected to a first terminal of the first capacitor C1, a first terminal of the first resistor R1, and a first terminal of the second resistor R2, an inverting input terminal of the operational amplifier U1 is used as a resistance detection signal input terminal of the comparison circuit 12i, an output terminal of the operational amplifier U1 and a first terminal of the third resistor R3 are used as sub identification signal output terminals of the comparison circuit 12i, a second terminal of the first capacitor C1 and a second terminal of the second resistor R2 are connected to a power ground in common, a second terminal of the first resistor R1 is connected to the first power supply VAA, and a second terminal of the third resistor R3 is connected to the second power supply VBB.
The operational amplifier U1 and its peripheral circuits are used as the comparison circuit 12i, and the circuit is simple and reliable.
The conversion module 13j includes a parallel-to-serial shift register U2, a second capacitor C2, and a fourth resistor R4.
A first parallel data input D0 of the incoupling shift register U2, a second parallel data input D1 of the incoupling shift register U2, a third parallel data input D2 of the incoupling shift register U2, a fourth parallel data input D3 of the incoupling shift register U2, a fifth parallel data input D4 of the incoupling shift register U2, a sixth parallel data input D5 of the incoupling shift register U2, a seventh parallel data input D6 of the incoupling shift register U2 and an eighth parallel data input D7 of the incoupling shift register U2 together serve as a set of sub-identification signal inputs of the conversion component 13j, a power supply terminal VCC of the incoupling shift register U2 and a first terminal of a second capacitor C2 are connected together to a third power supply VCC, a clock enable input/CE of the incoupling shift register U2 is connected to a first terminal of a fourth resistor R4, the asynchronous parallel load input/PL of the serial-out shift register U2 is incorporated as an enable signal input of the switch element 13j, the clock input CP of the serial-out shift register U2 is incorporated as a clock signal input of the switch element 13j, the complementary serial signal output/Q7 of the serial-out shift register U2 is incorporated as a serial identification signal output of the switch element 13j, and the ground GND of the serial-out shift register U2, the second terminal of the second capacitor C2, and the second terminal of the fourth resistor R4 are commonly connected to the power ground.
The conversion of the 8-bit parallel signal into 1 serial signal is realized using the inco-serial shift register U2 as the conversion component 13 j.
The control circuit 14 includes a microprocessor U3. The first general input/output terminal P1.0 of the microprocessor U3 is used as an enable signal output terminal of the control circuit 14, the second general input/output terminal P1.1 of the microprocessor U3 is used as a clock signal output terminal of the control circuit 14, and the third general input/output terminal P1.2 of the microprocessor U3 and the fourth general input/output terminal P1.3 of the microprocessor U3 are used as serial identification signal input terminals of the control circuit 14.
The resistance detection circuit 11 includes a connector J1, a fifth resistor R5, and a sixth resistor R6.
It will be appreciated that the connector J1 has two inputs. A first terminal of the connector J1, a first terminal of the fifth resistor R5, and a first terminal of the sixth resistor R6 are commonly connected to the resistor of the optical accessory and the resistor detection signal output terminal of the resistor detection circuit 11, a second terminal of the fifth resistor R5 is connected to the fourth power supply VDD, and a second terminal of the connector J1 and a second terminal of the sixth resistor R6 are connected to the power ground.
The fifth resistor R5, the sixth resistor R6, and the resistor attached to the optical accessory form a voltage dividing network, and in the above-mentioned voltage dividing network, the sixth resistor R6 functions as a hot plug (hot plug) for the optical accessory, that is: the sixth resistor R6 reduces the influence caused by hot plugging of the optical accessory, and effectively avoids the inductive effect caused by the situation that the fourth power supply VDD has no current to suddenly source current. In addition, the detection of various accessories can be realized only by realizing the input of signals through two input ends of the connector J1, the circuit is greatly simplified, and the cost is reduced.
The esd protection circuit 15 includes a first Transient Voltage Suppressor (TVS) D1, a third capacitor C3, and a fourth capacitor C4.
The first terminal of the first TVS transistor D1, the first terminal of the third capacitor C3, and the first terminal of the fourth capacitor C4 are connected to the power ground through a resistor detection signal input terminal of the esd protection circuit 15 and a resistor detection signal output terminal of the esd protection circuit 15, and the second terminal of the first TVS transistor D1, the second terminal of the third capacitor C3, and the second terminal of the fourth capacitor C4 are connected in common.
The first TVS transistor D1, the third capacitor C3, and the fourth capacitor C4 are an electrostatic protection measure, because the contacts exposed outside the housing can be contacted by human body, and static electricity can enter the control circuit 14 through the resistance detection circuit 11, in order to avoid the control circuit 14 from being damaged by the static electricity introduced from the outside, the electrostatic protection circuit 15 including the first TVS transistor D1, the third capacitor C3, and the fourth capacitor C4 is required to be added.
The following further description of fig. 5 to 7 is made in conjunction with the working principle:
when the optical accessory is connected, the resistor attached to the optical accessory is connected to the optical accessory detection circuit, the resistor, the fifth resistor R5 and the sixth resistor R6 form a voltage division network, and the resistance values of the resistors corresponding to different optical accessories are different, so that the voltage division voltage (resistor detection signal) output by the voltage division network is different when different optical accessories are connected. The divided voltage may be an analog quantity in the range of 0V to 36V.
The first TVS transistor D1, the third capacitor C3, and the fourth capacitor C4 suppress spike voltages in the resistance detection signal, and output the suppressed resistance detection signal to the plurality of comparison circuits 12 i. Namely: the suppressed resistance detection signal is output to all the comparison circuits 12 i.
The first resistor R1 and the second resistor R2 in the comparison circuit 12i divide the first voltage output by the first power supply VAA to generate the reference voltage, and the reference voltages corresponding to different comparison circuits 12i are different.
When the resistance detection signal is greater than the reference voltage, the operational amplifier U1 outputs a low level, whereas when the resistance detection signal is less than the reference voltage, the operational amplifier U1 outputs a logic high level. In this way, the plurality of comparing circuits 12i output a plurality of logic high levels or logic low levels, since the resistance detection signals are different and have a certain interval when different optical accessories are connected, when the resistance detection signals are input to the plurality of comparing circuits 12i, the plurality of comparing circuits 12i output a completely different combination of high level and low level (i.e. parallel identification signals), such as "11100000000000000000", "1111111111111110", etc. (where "1" represents a logic high level and "0" represents a logic low level), and these completely different multi-bit high and low levels correspond to different optical accessories, and the corresponding relationship is one-to-one.
If the parallel identification signal is directly outputted to the microcontroller U3, a lot of port resources are needed, which results in a great waste of microcontroller resources, so that one of the above-mentioned conversion circuits 13 is added, i.e. one or more parallel-to-serial shift registers U2 is added. The fourth resistor R4 is a pull-down resistor (pull-down enable) coupled to the chip select signal of the serial-out shift register U2. The incoupling shift register U2 converts the parallel identification signal into a serial identification signal, e.g., as shown in fig. 6, two sets of serial identification signals are input in common to the microcontroller U3. In this process, the microcontroller U3 controls the latches of the data of the parallel identification signal to the latches incorporated within the serial shift register U2 via the enable signal and controls the shift register incorporated within the serial shift register U2 via the clock signal to shift the clock signal out of a set of serial identification signals.
Finally, the third universal input/output end P1.2 of the microprocessor U3 and the fourth universal input/output end P1.3 of the microprocessor U3 receive the serial identification signal, and obtain the identification information of the optical accessory according to the serial identification signal.
In a specific implementation, the microprocessor U3 may further adjust parameters of the photographing apparatus according to the identification information of the optical accessory; or the microprocessor U3 may also send the identification information of the optical accessory to the photographing apparatus, which adjusts the parameters; to adapt the parameters of the photographic equipment to the optical accessory.
In some application scenarios, since the number of the single contacts is generally large, and is generally 2 or more, when the accessory is mounted on the lighting device, the contacts of the accessory and the contacts of the lighting device must be accurately aligned and mounted to achieve detection, but in most cases, since the accessory is various in types and has a large volume, which easily blocks a view, and the lighting device has contacts only in one area, in an actual operation process, the contacts of the accessory and the contacts of the lighting device are easily misaligned by a user, which leads to inaccurate detection.
In some embodiments, referring to fig. 9, embodiments of the present application further provide an illumination device including the optical attachment detection circuit described above. The lighting device further comprises a housing 10, a plurality of contact sets 20 and a light source 30. Wherein the optical accessory detection circuit and the light source 30 are disposed in the housing 10, fig. 9 can be understood as an end view of the lighting device along the optical axis of the light source 30 (i.e., looking toward the light source), and the housing 10 can accommodate all parts of the light source 30 and the optical accessory detection circuit, but it can also include an upper shell, a lower shell, an end cap, a rear cover, etc., and is not limited herein. The housing 10 may also be provided with a bayonet, which may be a bayonette bayonet or a bayonet of another size, etc. The bayonet may be used for mounting of optical accessories, wherein the set of contacts 20 may be arranged in the bayonet, but may of course also be located not in the bayonet but at other side or end wall positions of the housing 10. The optical accessory can be mounted on the housing 10 and located in the light emitting direction of the light source 30 so as to adjust and control the light of the light source 30, such as adjusting the light spot or restricting the light beam.
A plurality of contact sets 20 are spaced around the light source 30. It will be appreciated that the number of contact sets 20 may be 2, 3 or 4, etc., wherein a plurality of contact sets 20 are evenly spaced around the light source 30, as viewed along the end face of the light source 30, with the contact sets being spaced from the light source 30. Of course, 1 or more contact sets (not shown) may be provided on the corresponding accessory. The plurality of contact sets 20 of the lighting device are connected in parallel with each other. Wherein each contact set 20 includes a first contact 21 and a second contact 22, the first contact 21 may be one, and the second contact 22 may be one, wherein the first contact 21 is electrically connected to the first end 1 of the connector J1, and the second contact 22 is electrically connected to the second end 2 of the connector J1. It will be appreciated that the plurality of contact sets 20 are connected in parallel with each other, i.e., all of the first contacts 21 are connected to the same end of the connector J1 (e.g., the first end 1 of J1), and all of the second contacts 22 are connected to the other end of the connector J1 (e.g., the first end 1 of J1). The first contact 21 and the second contact 22 leak out at least partially with respect to the housing.
It is understood that the first contact 21 and the second contact 22 may be metal contacts or spring contacts, the contacts 21 and 22 may be spaced apart, the contacts 21 and 22 are mechanically fixed to the housing 10 and partially exposed relative to the surface of the housing 10, and the conductive portions of the contacts 21 and 22 correspond to the first end 1 and the second end 2 of the connector for electrically connecting the electrical signal to the resistance detection circuit 11. Contact detection is achieved by simply contacting the contacts on the optical accessory with the contacts in any one of the contact sets 20. Because the plurality of contact sets 20 are spaced around the light source 30, the optical accessory can be mounted on the lighting device in any direction without being limited to mounting in a specific direction, and the accuracy and reliability of accessory detection are greatly improved.
The embodiment of the invention detects the resistance attached to the optical accessory through the resistance detection circuit to output a resistance detection signal; wherein the resistances of the resistors on different optical accessories are different; the identification circuit compares the resistance detection signal with a plurality of reference voltages and generates a parallel identification signal according to a plurality of comparison results; the conversion circuit converts the parallel identification signal into a serial identification signal; the control circuit obtains the identification information of the optical accessory according to the serial identification signal; because the resistance values of the resistors corresponding to different optical accessories are different, different serial identification signals can be obtained by detecting the resistors, so that the identification information of the optical accessories can be identified, and the identification of the optical accessories is realized.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. An optical attachment detection circuit, comprising:
a resistance detection circuit configured to detect a resistance attached to the optical accessory to output a resistance detection signal; wherein the resistances of the resistors on different optical accessories are different; the resistor is attached to the surface of the optical accessory or the inside of the optical accessory, and the optical accessory is provided with a contact group electrically connected with the resistor detection circuit;
an identification circuit connected to the resistance detection circuit and configured to compare the resistance detection signal with a plurality of reference voltages and generate a parallel identification signal according to a plurality of comparison results;
a conversion circuit connected to the identification circuit and configured to convert the parallel identification signal into a serial identification signal;
the control circuit is connected with the conversion circuit and is configured to obtain the identification information of the optical accessory according to the serial identification signal;
the resistance detection circuit comprises a connector, a fifth resistor and a sixth resistor;
a first end of the connector, a first end of the fifth resistor and a first end of the sixth resistor are commonly connected to the resistor of the optical accessory and a resistor detection signal output end of the resistor detection circuit, a second end of the fifth resistor is connected with a fourth power supply, and a second end of the connector and a second end of the sixth resistor are connected with a power ground; the resistor of the optical accessory, the fifth resistor R5 and the sixth resistor R6 form a voltage division network, and the voltage division network outputs a voltage division voltage which is an analog quantity within the range of 0-36 v.
2. The optical attachment detection circuit of claim 1 wherein the parallel identification signal comprises a plurality of sub-identification signals, the identification circuit comprising a plurality of comparison circuits;
the comparison circuit is connected with the resistance detection circuit and the conversion circuit, is configured to compare the resistance detection signal with one reference voltage, and generates one sub-identification signal according to a comparison result;
the reference voltages corresponding to different comparison circuits are different.
3. The optical accessory detection circuit of claim 2, wherein the comparison circuit comprises an operational amplifier, a first capacitor, a first resistor, a second resistor, and a third resistor;
the positive phase input end of the operational amplifier is connected with the first end of the first capacitor, the first end of the first resistor and the first end of the second resistor, the negative phase input end of the operational amplifier is used as the resistor detection signal input end of the comparison circuit, the output end of the operational amplifier and the first end of the third resistor are used as the sub-identification signal output end of the comparison circuit, the second end of the first capacitor and the second end of the second resistor are connected with a power ground in a shared mode, the second end of the first resistor is connected with a first power supply, and the second end of the third resistor R3 is connected with a second power supply.
4. The optical attachment detection circuit of claim 1 wherein the parallel identification signal comprises a plurality of sets of sub-identification signals, the serial identification signal is plural, the plurality of sets of sub-identification signals correspond one-to-one to the plurality of serial identification signals; the conversion circuit comprises a plurality of conversion components;
the conversion component is connected with the identification circuit and the control circuit and is configured to convert a group of the sub-identification signals into a serial identification signal.
5. The optical attachment detection circuit of claim 4 wherein the conversion component includes a parallel-to-serial shift register, a second capacitor, and a fourth resistor;
the first parallel data input end of the merging-and-serializing shift register, the second parallel data input end of the merging-and-serializing shift register, the third parallel data input end of the merging-and-serializing shift register, the fourth parallel data input end of the merging-and-serializing shift register, the fifth parallel data input end of the merging-and-serializing shift register, the sixth parallel data input end of the merging-and-serializing shift register, the seventh parallel data input end of the merging-and-serializing shift register and the eighth parallel data input end of the merging-and-serializing shift register are jointly used as a group of sub-identification signal input ends of the conversion component, the power supply end of the merging-and-serializing shift register and the first end of the second capacitor are jointly connected to a third power supply, and the clock enable input end of the merging-and-serializing shift register is connected with the first end of the fourth resistor, the asynchronous parallel loading input end of the merging and serial-out shift register is used as an enabling signal input end of the conversion component, the clock input end of the merging and serial-out shift register is used as a clock signal input end of the conversion component, the complementary serial signal output end of the merging and serial-out shift register is used as a serial identification signal output end of the conversion component, and the grounding end of the merging and serial-out shift register, the second end of the second capacitor and the second end of the fourth resistor are connected to a power ground in a shared mode.
6. The optical attachment detection circuit of any one of claims 1-5 wherein the control circuit includes a microprocessor;
the first general input-output end of the microprocessor is used as an enabling signal output end of the control circuit, the second general input-output end of the microprocessor is used as a clock signal output end of the control circuit, and the third general input-output end of the microprocessor and the fourth general input-output end of the microprocessor are used as serial identification signal input ends of the control circuit.
7. The optical attachment detection circuit of any one of claims 1-5 further comprising:
an electrostatic protection circuit connected with the resistance detection circuit and the identification circuit and configured to suppress spike voltage in the resistance detection signal;
the identification circuit is specifically configured to compare the suppressed resistance detection signal with a plurality of reference voltages and to generate a parallel identification signal according to the comparison result.
8. The optical attachment detection circuit of claim 7, wherein the electrostatic protection circuit comprises a first TVS transistor, a third capacitor, and a fourth capacitor;
the first end of the first TVS tube, the first end of the third capacitor and the first end of the fourth capacitor are used as a resistance detection signal input end of the electrostatic protection circuit and a resistance detection signal output end of the electrostatic protection circuit, and the second end of the first TVS tube, the second end of the third capacitor and the second end of the fourth capacitor are connected to a power ground in a sharing mode.
9. An illumination device characterized in that it comprises an optical accessory detection circuit according to any of claims 1 to 8.
10. The lighting apparatus of claim 9 further comprising a housing (10), a plurality of contact sets (20) and a light source (30), wherein the optical attachment detection circuit and the light source (30) are disposed within the housing (10), wherein the plurality of contact sets (20) are spaced around the light source (30), wherein the plurality of contact sets (20) are connected in parallel with each other, wherein each of the contact sets (20) comprises a first contact (21) and a second contact (22), wherein the first contact (21) is electrically connected to the first end (1) of the connector (J1), wherein the second contact (22) is electrically connected to the second end (2) of the connector (J1), and wherein the first contact (21) and the second contact (22) are at least partially exposed from the housing.
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| CN102354193A (en) * | 2011-09-08 | 2012-02-15 | 山东科汇电力自动化有限公司 | Switching signal acquisition method |
| CN103365042A (en) * | 2012-04-04 | 2013-10-23 | 佳能株式会社 | Image pickup apparatus and lens unit |
| CN107179441A (en) * | 2017-04-28 | 2017-09-19 | 上海与德科技有限公司 | The detection circuit of mobile terminal and the module classification method based on detection circuit |
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| DE102009019625B4 (en) * | 2009-04-30 | 2014-05-15 | Osram Gmbh | A method of determining a type of gas discharge lamp and electronic ballast for operating at least two different types of gas discharge lamps |
| CN206726210U (en) * | 2017-05-16 | 2017-12-08 | 烟台市迈高机器人科技有限公司 | The expansion interface circuit of the one-to-many universal serial bus of near-end |
| RU2714842C2 (en) * | 2017-05-31 | 2020-02-19 | Кэнон Кабусики Кайся | Image capturing device and accessories |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354193A (en) * | 2011-09-08 | 2012-02-15 | 山东科汇电力自动化有限公司 | Switching signal acquisition method |
| CN103365042A (en) * | 2012-04-04 | 2013-10-23 | 佳能株式会社 | Image pickup apparatus and lens unit |
| CN107179441A (en) * | 2017-04-28 | 2017-09-19 | 上海与德科技有限公司 | The detection circuit of mobile terminal and the module classification method based on detection circuit |
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