CN219499595U - Constant voltage dimming and color mixing fault detection circuit and constant voltage dimming and color mixing machine - Google Patents
Constant voltage dimming and color mixing fault detection circuit and constant voltage dimming and color mixing machine Download PDFInfo
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- CN219499595U CN219499595U CN202320144062.4U CN202320144062U CN219499595U CN 219499595 U CN219499595 U CN 219499595U CN 202320144062 U CN202320144062 U CN 202320144062U CN 219499595 U CN219499595 U CN 219499595U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The application provides a constant voltage dimming color matching fault detection circuit and a constant voltage dimming color matching machine. The constant voltage dimming and color mixing fault detection circuit comprises a constant voltage lamp belt circuit, an open circuit fault detection circuit and a short circuit fault detection circuit; the open-circuit fault detection circuit comprises a voltage comparator, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a detection diode, wherein the second end of the fourth resistor is also connected with the positive end of the voltage comparator, and the positive end of the detection diode is also connected with the open-circuit input end of the dimming and toning processor; the short-circuit fault detection circuit comprises a second electronic switching tube and a seventh resistor, and the first end of the second electronic switching tube is also connected with the short-circuit input end of the dimming and toning processor. When power supply fluctuation or line interference occurs, the positive end and the negative end of the voltage comparator are common-mode input signals to form a differential circuit, so that interference signals can be conveniently offset, and the anti-interference performance for open circuit and short circuit detection is effectively improved.
Description
Technical Field
The utility model relates to the technical field of dimming, in particular to a constant-voltage dimming and color matching fault detection circuit and a constant-voltage dimming and color matching machine.
Background
The current market is increasingly demanding light and color adjusting products, the light and color adjusting products can be used for meeting the demands of different occasions by adjusting different color temperatures through a control device in various occasions such as hotels and families, and the DALI digital addressable lighting interface is used as a novel intelligent lighting system control protocol and is widely applied to various lighting projects due to the characteristics of simple structure, convenience in installation, easiness in operation, excellent functions and the like.
Due to the updated iterations and specifications of application techniques, which solve more dimming compatibility problems, the DALI alliance pushes out DALI-2, the second major version of the DALI protocol standard. DALI-2 certified LED driving requirements must support fault state detection functions, i.e. output open and short state detection. For most DALI constant-voltage dimming and toning control devices at present, open circuit and short circuit judgment are basically carried out by sampling current signals on an output loop. Because the detected signal is very weak, the signal is easy to interfere to cause false detection, and the system is triggered by mistake or is not protected after the fault occurs.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provides a constant-voltage dimming and color mixing fault detection circuit and a constant-voltage dimming and color mixing machine, which can effectively improve anti-interference performance.
The aim of the utility model is realized by the following technical scheme:
a constant voltage dimming color matching fault detection circuit comprising: constant voltage lamp band circuit, open circuit fault detection circuit and short circuit fault detection circuit; the constant-voltage lamp belt comprises a constant-voltage lamp belt, a first electronic switch tube, a first resistor and a dimming and toning processor, wherein the positive electrode of the constant-voltage lamp belt is connected with a first reference power supply, the negative electrode of the constant-voltage lamp belt is connected with the first end of the first electronic switch tube, the second end of the first electronic switch tube is grounded through the first resistor, and the control end of the first electronic switch tube is connected with the regulation and control output end of the dimming and toning processor; the open circuit fault detection circuit comprises a voltage comparator, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a detection diode, wherein the first end of the second resistor is used for being connected with a second reference power supply, the second end of the second resistor is connected with the first end of the third resistor, the second end of the third resistor is grounded, the second end of the second resistor is also connected with the negative end of the voltage comparator, the second reference power supply is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the first end of the fifth resistor, the second end of the fifth resistor is connected with the first end of the first electronic switch tube, the second end of the fourth resistor is also connected with the positive end of the voltage comparator, the second reference power supply is also connected with the positive end of the detection diode through the sixth resistor, the negative end of the detection diode is also connected with the output end of the voltage comparator, and the positive end of the detection diode is also connected with the open circuit light modulation processor; the short-circuit fault detection circuit comprises a second electronic switching tube and a seventh resistor, wherein the second reference power supply is connected with the first end of the seventh resistor, the second end of the seventh resistor is connected with the first end of the second electronic switching tube, the second end of the second electronic switching tube is grounded, the second end of the first electronic switching tube is connected with the control end of the second electronic switching tube, and the first end of the second electronic switching tube is also connected with the short-circuit input end of the dimming and toning processor.
In one embodiment, the resistance of the second resistor is equal to the resistance of the fourth resistor, and the resistance of the third resistor is equal to the resistance of the fifth resistor.
In one embodiment, at least one of the second resistor and the third resistor is a variable resistor.
In one embodiment, at least one of the fourth resistor and the fifth resistor is a variable resistor.
In one embodiment, the open fault detection circuit further includes an eighth resistor, the second end of the fourth third resistor is connected to the first end of the eighth resistor, and the second end of the eighth resistor is grounded.
In one embodiment, the short-circuit fault detection circuit further includes a short-circuit filter capacitor, the first end of the second electronic switch tube is connected to the first end of the short-circuit filter capacitor, and the second end of the short-circuit filter capacitor is grounded.
In one embodiment, the short circuit filter capacitance is a variable capacitance.
In one embodiment, the short-circuit fault detection circuit further includes a ninth resistor and a tenth resistor, the second end of the first electronic switching tube is connected to the control end of the second electronic switching tube through the ninth resistor, and the control end of the second electronic switching tube is grounded through the tenth resistor.
In one embodiment, at least one of the ninth resistor and the tenth resistor is a variable resistor.
A constant voltage dimming color mixer comprises the constant voltage dimming color mixing fault detection circuit according to any of the embodiments.
Compared with the prior art, the utility model has at least the following advantages:
the positive end and the negative end of the voltage comparator are both based on the voltage of the second reference power supply and have the same power supply, and when power supply fluctuation or line interference occurs, the positive end and the negative end of the voltage comparator are common-mode input signals so as to form a differential circuit, so that interference signals are conveniently offset, and the anti-interference performance for open circuit and short circuit detection is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a circuit diagram of a constant voltage dimming color fault detection circuit in an embodiment;
FIG. 2 is a circuit diagram of a constant voltage lamp strip circuit in the constant voltage dimming color matching fault detection circuit shown in FIG. 1;
fig. 3 is a circuit diagram of an open-circuit fault detection circuit in the constant voltage dimming color matching fault detection circuit shown in fig. 1;
fig. 4 is a circuit diagram of a short-circuit fault detection circuit in the constant voltage dimming color matching fault detection circuit shown in fig. 1.
Detailed Description
In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the utility model. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The utility model relates to a constant voltage dimming and color matching fault detection circuit. In one embodiment, the constant voltage dimming color matching fault detection circuit comprises a constant voltage lamp strip circuit, an open circuit fault detection circuit and a short circuit fault detection circuit. The constant-voltage lamp belt comprises a constant-voltage lamp belt, a first electronic switch tube, a first resistor and a dimming and toning processor. The positive pole of constant voltage lamp area is used for being connected with first benchmark power, the negative pole of constant voltage lamp area with the first end of first electronic switch tube is connected, the second end of first electronic switch tube passes through first resistance ground connection, the control end of first electronic switch tube with adjust luminance the regulation and control output of mixing of colors treater is connected. The open circuit fault detection circuit comprises a voltage comparator, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a detection diode. The first end of the second resistor is used for being connected with a second reference power supply, the second end of the second resistor is connected with the first end of the third resistor, the second end of the third resistor is grounded, the second end of the second resistor is also connected with the negative end of the voltage comparator, the second reference power supply is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the first end of the fifth resistor, the second end of the fifth resistor is connected with the first end of the first electronic switch tube, and the second end of the fourth resistor is also connected with the positive end of the voltage comparator. The second reference power supply is further connected with the positive electrode of the detection diode through the sixth resistor, the negative electrode of the detection diode is connected with the output end of the voltage comparator, and the positive electrode of the detection diode is further connected with the open-circuit input end of the dimming and toning processor. The short-circuit fault detection circuit comprises a second electronic switching tube and a seventh resistor. The second reference power supply is connected with the first end of the seventh resistor, the second end of the seventh resistor is connected with the first end of the second electronic switching tube, the second end of the second electronic switching tube is grounded, the second end of the first electronic switching tube is connected with the control end of the second electronic switching tube, and the first end of the second electronic switching tube is also connected with the short-circuit input end of the dimming and toning processor. The positive end and the negative end of the voltage comparator are both based on the voltage of the second reference power supply and have the same power supply, and when power supply fluctuation or line interference occurs, the positive end and the negative end of the voltage comparator are common-mode input signals so as to form a differential circuit, so that interference signals are conveniently offset, and the anti-interference performance for open circuit and short circuit detection is effectively improved.
Fig. 1 is a schematic diagram of a constant voltage dimming color matching fault detection circuit according to an embodiment of the utility model.
The constant voltage dimming color matching fault detection circuit 10 of an embodiment includes a constant voltage lamp strip circuit 100, an open fault detection circuit 200, and a short fault detection circuit 300. Referring to fig. 2, the constant voltage lamp band circuit 100 includes a constant voltage lamp band LED1, a first electronic switching tube Q1, a first resistor R1, and a dimming and toning processor U1. The positive pole of constant voltage lamp area LED1 is used for being connected with first reference power VO+, constant voltage lamp area LED 1's negative pole with first electronic switch tube Q1's first end is connected, first electronic switch tube Q1's second end is passed through first resistance R1 ground connection, first electronic switch tube Q1's control end with adjust luminance the regulation and control output of mixing of colors treater U1 is connected. Referring to fig. 3, the open circuit fault detection circuit 200 includes a voltage comparator U2, a second resistor R8, a third resistor R9, a fourth resistor R10, a fifth resistor R2, a sixth resistor R4, and a detection diode D1. The first end of the second resistor R8 is connected to a second reference power VCC, the second end of the second resistor R8 is connected to the first end of the third resistor R9, the second end of the third resistor R9 is grounded, the second end of the second resistor R8 is further connected to the negative end of the voltage comparator U2, the second reference power VCC is connected to the first end of the fourth resistor R10, the second end of the fourth resistor R10 is connected to the first end of the fifth resistor R2, the second end of the fifth resistor R2 is connected to the first end of the first electronic switch tube Q1, and the second end of the fourth resistor R10 is further connected to the positive end of the voltage comparator U2. The second reference power supply VCC is further connected with the positive electrode of the detection diode D1 through the sixth resistor R4, the negative electrode of the detection diode D1 is connected with the output end of the voltage comparator U2, and the positive electrode of the detection diode D1 is further connected with the open-circuit input end of the dimming and toning processor U1. Referring to fig. 4, the short-circuit fault detection circuit 300 includes a second electronic switch Q3 and a seventh resistor R5. The second reference power supply VCC is connected with the first end of the seventh resistor R5, the second end of the seventh resistor R5 is connected with the first end of the second electronic switching tube Q3, the second end of the second electronic switching tube Q3 is grounded, the second end of the first electronic switching tube Q1 is connected with the control end of the second electronic switching tube Q3, and the first end of the second electronic switching tube Q3 is also connected with the short-circuit input end of the dimming and toning processor U1.
In this embodiment, the positive terminal and the negative terminal of the voltage comparator U2 are both based on the voltage of the second reference power VCC, and have the same power supply, and when power supply fluctuation or line interference occurs, the positive terminal and the negative terminal of the voltage comparator U2 are common-mode input signals to form a differential circuit, so that interference signals are conveniently offset from each other, and anti-interference performance for open circuit and short circuit detection is effectively improved.
In one embodiment, referring to fig. 3, the resistance of the second resistor R8 is equal to the resistance of the fourth resistor R10, and the resistance of the third resistor R9 is equal to the resistance of the fifth resistor R2. In this embodiment, the second resistor R8 is connected in series with the third resistor R9, where the second resistor R8 and the third resistor R9 form a voltage dividing circuit, that is, the second resistor R8 and the third resistor R9 form a voltage dividing circuit of a reference voltage, that is, the second resistor R8 and the third resistor R9 form a voltage dividing circuit of a negative terminal of the voltage comparator U2, so as to provide a standard voltage for the negative terminal of the voltage comparator U2. The fourth resistor R10 is connected in series with the fifth resistor R2, and the fourth resistor R10 and the fifth resistor R2 form a voltage dividing circuit, that is, the fourth resistor R10 and the fifth resistor R2 form a voltage dividing circuit of an open circuit detection voltage, that is, the fourth resistor R10 and the fifth resistor R2 form a voltage dividing circuit of a positive terminal of the voltage comparator U2, so as to provide an open circuit fault detection voltage for the positive terminal of the voltage comparator U2. The resistance ratio of the second resistor R8 to the third resistor R9 is equal to the resistance ratio of the fourth resistor R10 to the fifth resistor R2, so that the voltage signals input by the negative terminal and the positive terminal of the voltage comparator U2 are common mode signals, and interference signals are conveniently offset when voltage comparison is performed, so that interference is reduced.
In one embodiment, at least one of the second resistor R8 and the third resistor R9 is a variable resistor. In this embodiment, the second resistor R8 is connected in series with the third resistor R9, where the second resistor R8 and the third resistor R9 form a voltage dividing circuit, that is, the second resistor R8 and the third resistor R9 form a voltage dividing circuit of a reference voltage, that is, the second resistor R8 and the third resistor R9 form a voltage dividing circuit of a negative terminal of the voltage comparator U2, so as to provide a standard voltage for the negative terminal of the voltage comparator U2. Any one of the second resistor R8 and the third resistor R9 is adjusted in resistance value, so that the standard voltage of the negative terminal of the voltage comparator U2 is adjusted, and the comparison voltage of the open circuit detection voltage of the constant voltage lamp strip LED1 is adjusted conveniently. In another embodiment, at least one of the fourth resistor R10 and the fifth resistor R2 is a variable resistor, the fourth resistor R10 is connected in series with the fifth resistor R2, the fourth resistor R10 and the fifth resistor R2 form a voltage dividing circuit, that is, the fourth resistor R10 and the fifth resistor R2 form a voltage dividing circuit of an open circuit detection voltage, that is, the fourth resistor R10 and the fifth resistor R2 form a voltage dividing circuit of a positive end of the voltage comparator U2, and by adjusting a resistance value of any one of the fourth resistor R10 and the fifth resistor R2, an input voltage of the positive end of the voltage comparator U2 is conveniently adjusted, so that a magnitude of the open circuit detection voltage of the constant voltage lamp strip LED1 is conveniently adjusted, and a sampling value of the open circuit detection voltage of the constant voltage lamp strip LED1 is conveniently adjusted.
In one embodiment, referring to fig. 3, the open fault detection circuit 200 further includes an eighth resistor R12, wherein a second end of the third resistor R9 is connected to a first end of the eighth resistor R12, and a second end of the eighth resistor R12 is grounded. In this embodiment, the eighth resistor R12 is connected in series with the third resistor R9, and the eighth resistor R12 provides a stable reference voltage for the negative terminal of the voltage comparator U2, i.e. pulls up the voltage on the negative terminal of the voltage comparator U2, so that the comparison reference voltage of the voltage comparator U2 is sufficient.
In one embodiment, referring to fig. 4, the short-circuit fault detection circuit 300 further includes a short-circuit filter capacitor C6, the first end of the second electronic switching tube Q3 is connected to the first end of the short-circuit filter capacitor C6, and the second end of the short-circuit filter capacitor C6 is grounded. In this embodiment, the short-circuit filter capacitor C6 is connected to the second electronic switching tube Q3, that is, the short-circuit filter capacitor C6 is connected in parallel between the first end and the second end of the second electronic switching tube Q3, and the short-circuit filter capacitor C6 filters an electrical signal at the first end of the second electronic switching tube Q3, so as to ensure the accuracy of a short-circuit detection signal collected by the short-circuit input end of the dimming and toning processor U1. In another embodiment, the short-circuit filter capacitor C6 is a variable capacitor, and the voltage at the short-circuit input end of the dimming and toning processor U1 is conveniently and accurately filtered by adjusting the capacitance value of the short-circuit filter capacitor C6.
In one embodiment, referring to fig. 4, the short-circuit fault detection circuit 300 further includes a ninth resistor R6 and a tenth resistor R7, the second end of the first electronic switching tube Q1 is connected to the control end of the second electronic switching tube Q3 through the ninth resistor R6, and the control end of the second electronic switching tube Q3 is grounded through the tenth resistor R7. In this embodiment, the ninth resistor R6 is connected in series to the control end of the second electronic switching tube Q3, the tenth resistor R7 is connected in parallel between the control end and the second end of the second electronic switching tube Q3, and the ninth resistor R6 and the tenth resistor R7 are connected in series to each other to form a voltage dividing circuit, so as to provide a turn-on voltage for the control end of the second electronic switching tube Q3, thereby facilitating the turn-on of the second electronic switching tube Q3. In another embodiment, at least one of the ninth resistor R6 and the tenth resistor R7 is a variable resistor, and by adjusting any one of the resistance values of the ninth resistor R6 and the tenth resistor R7, the on-voltage of the second electronic switching tube Q3 is conveniently adjusted, so that the on-voltage of the second electronic switching tube Q3 is conveniently applied to the on of different second electronic switching tubes Q3.
In one embodiment, the application further provides a constant voltage dimming color mixer, which comprises the constant voltage dimming color mixing fault detection circuit according to any one of the embodiments. In this embodiment, the constant voltage dimming color matching fault detection circuit includes a constant voltage lamp strip circuit, an open circuit fault detection circuit, and a short circuit fault detection circuit. The constant-voltage lamp belt comprises a constant-voltage lamp belt, a first electronic switch tube, a first resistor and a dimming and toning processor. The positive pole of constant voltage lamp area is used for being connected with first benchmark power, the negative pole of constant voltage lamp area with the first end of first electronic switch tube is connected, the second end of first electronic switch tube passes through first resistance ground connection, the control end of first electronic switch tube with adjust luminance the regulation and control output of mixing of colors treater is connected. The open circuit fault detection circuit comprises a voltage comparator, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a detection diode. The first end of the second resistor is used for being connected with a second reference power supply, the second end of the second resistor is connected with the first end of the third resistor, the second end of the third resistor is grounded, the second end of the second resistor is also connected with the negative end of the voltage comparator, the second reference power supply is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the first end of the fifth resistor, the second end of the fifth resistor is connected with the first end of the first electronic switch tube, and the second end of the fourth resistor is also connected with the positive end of the voltage comparator. The second reference power supply is further connected with the positive electrode of the detection diode through the sixth resistor, the negative electrode of the detection diode is connected with the output end of the voltage comparator, and the positive electrode of the detection diode is further connected with the open-circuit input end of the dimming and toning processor. The short-circuit fault detection circuit comprises a second electronic switching tube and a seventh resistor. The second reference power supply is connected with the first end of the seventh resistor, the second end of the seventh resistor is connected with the first end of the second electronic switching tube, the second end of the second electronic switching tube is grounded, the second end of the first electronic switching tube is connected with the control end of the second electronic switching tube, and the first end of the second electronic switching tube is also connected with the short-circuit input end of the dimming and toning processor. The positive end and the negative end of the voltage comparator are both based on the voltage of the second reference power supply and have the same power supply, and when power supply fluctuation or line interference occurs, the positive end and the negative end of the voltage comparator are common-mode input signals so as to form a differential circuit, so that interference signals are conveniently offset, and the anti-interference performance for open circuit and short circuit detection is effectively improved.
The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (10)
1. A constant voltage dimming color matching fault detection circuit, comprising:
the constant-voltage lamp strip circuit comprises a constant-voltage lamp strip, a first electronic switch tube, a first resistor and a dimming and toning processor, wherein the positive electrode of the constant-voltage lamp strip is used for being connected with a first reference power supply, the negative electrode of the constant-voltage lamp strip is connected with the first end of the first electronic switch tube, the second end of the first electronic switch tube is grounded through the first resistor, and the control end of the first electronic switch tube is connected with the regulation and control output end of the dimming and toning processor;
the open circuit fault detection circuit comprises a voltage comparator, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a detection diode, wherein the first end of the second resistor is used for being connected with a second reference power supply, the second end of the second resistor is connected with the first end of the third resistor, the second end of the third resistor is grounded, the second end of the second resistor is further connected with the negative end of the voltage comparator, the second reference power supply is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the first end of the fifth resistor, the second end of the fifth resistor is further connected with the positive end of the voltage comparator, the second reference power supply is further connected with the positive electrode of the detection diode through the sixth resistor, the negative electrode of the detection diode is further connected with the output end of the voltage comparator, and the positive end of the detection diode is further connected with the positive end of the open circuit dimmer;
the short circuit fault detection circuit comprises a second electronic switch tube and a seventh resistor, wherein the second reference power supply is connected with the first end of the seventh resistor, the second end of the seventh resistor is connected with the first end of the second electronic switch tube, the second end of the second electronic switch tube is grounded, the second end of the first electronic switch tube is connected with the control end of the second electronic switch tube, and the first end of the second electronic switch tube is also connected with the short circuit input end of the dimming and toning processor.
2. The constant voltage dimming color matching fault detection circuit according to claim 1, wherein the resistance of the second resistor is equal to the resistance of the fourth resistor, and the resistance of the third resistor is equal to the resistance of the fifth resistor.
3. The constant voltage dimming color matching fault detection circuit according to claim 1, wherein at least one of the second resistor and the third resistor is a variable resistor.
4. The constant voltage dimming color matching fault detection circuit according to claim 1, wherein at least one of the fourth resistor and the fifth resistor is a variable resistor.
5. The constant voltage dimming color matching fault detection circuit as claimed in claim 1, wherein the open circuit fault detection circuit further comprises an eighth resistor, a second end of the third resistor is connected to a first end of the eighth resistor, and a second end of the eighth resistor is grounded.
6. The constant voltage dimming color matching fault detection circuit of claim 1, further comprising a short circuit filter capacitor, wherein the first terminal of the second electronic switching tube is connected to the first terminal of the short circuit filter capacitor, and wherein the second terminal of the short circuit filter capacitor is grounded.
7. The constant voltage dimming color matching fault detection circuit of claim 6, wherein the short circuit filter capacitor is a variable capacitor.
8. The constant voltage dimming color matching fault detection circuit according to claim 1, wherein the short circuit fault detection circuit further comprises a ninth resistor and a tenth resistor, the second end of the first electronic switching tube is connected with the control end of the second electronic switching tube through the ninth resistor, and the control end of the second electronic switching tube is grounded through the tenth resistor.
9. The constant voltage dimming color matching fault detection circuit according to claim 8, wherein at least one of the ninth resistor and the tenth resistor is a variable resistor.
10. A constant voltage dimming color mixer, characterized by comprising the constant voltage dimming color mixing fault detection circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320144062.4U CN219499595U (en) | 2023-01-31 | 2023-01-31 | Constant voltage dimming and color mixing fault detection circuit and constant voltage dimming and color mixing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320144062.4U CN219499595U (en) | 2023-01-31 | 2023-01-31 | Constant voltage dimming and color mixing fault detection circuit and constant voltage dimming and color mixing machine |
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| CN219499595U true CN219499595U (en) | 2023-08-08 |
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| CN202320144062.4U Active CN219499595U (en) | 2023-01-31 | 2023-01-31 | Constant voltage dimming and color mixing fault detection circuit and constant voltage dimming and color mixing machine |
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| CN (1) | CN219499595U (en) |
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