A day and night switching dimming circuit for indicator lights

Abstract

The present application provides a day-night switching dimming circuit for an indicator light, which relates to the technical field of electronic circuits. The circuit includes: a dimming subcircuit and a switching subcircuit connected to the dimming subcircuit for day-night switching. In the day mode, the switching subcircuit is disconnected, and only the dimming subcircuit works for dimming in the day mode; in the night mode, the switching subcircuit is connected to the dimming circuit, and the switching subcircuit cooperates with the dimming subcircuit to work for dimming in the night mode, and the switching subcircuit includes a relay for switching. The circuit realizes brightness adjustment and day-night mode switching of the working status information indicator light and the redundancy information indicator light of the autopilot system, the automatic throttle system and the elevator adjustment mechanism, and the circuit is simple, practical and low-cost.

Description

Technical Field

[0001] The invention relates to the technical field of electronic circuits, and in particular provides a day-night switching dimming circuit for an indicator light. Background Art

[0002] Automatic flight control boards are mainly divided into digital and analog types. The day and night switching dimming circuit of the indicator lights of digital automatic flight control boards is realized through DSP + peripheral digital circuits, while analog automatic flight control boards only involve the dimming of indicator lights in the "day mode" state, without the "night mode" state, which is difficult to meet the requirements of automatic flight control in the existing technology. Summary of the invention

[0003] The purpose of the present application is to solve the problem in the prior art that the automatic flight control panel has no "night mode" state, and to provide a dimming circuit for switching between day and night, so as to adjust the brightness of the working status information indicator lights and the redundancy information indicator lights of the autopilot system, the automatic throttle system and the elevator adjustment mechanism, and to switch between day and night modes.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a day and night switching dimming circuit for an indicator light, the circuit comprising: a dimming subcircuit and a switching subcircuit connected to the dimming subcircuit for day and night switching, in the day mode, the switching subcircuit is disconnected, and only the dimming subcircuit works for dimming in the day mode; in the night mode, the switching subcircuit is connected to the dimming circuit, and the switching subcircuit cooperates with the dimming subcircuit to work for dimming in the night mode, and the switching subcircuit comprises a relay for switching.

[0005] The indicator light day and night switching dimming circuit provided by the present invention also has the following technical features: the dimming sub-circuit includes a three-terminal adjustable voltage regulator, a second resistor connected to the adjustment end of the three-terminal adjustable voltage regulator, a variable resistor connected between the adjustment end of the three-terminal adjustable voltage regulator and the power ground, a second capacitor connected between the input end of the three-terminal adjustable voltage regulator and the 28V power supply, a first diode with a positive pole connected to the output end of the three-terminal adjustable voltage regulator and a negative pole connected to the input end of the three-terminal adjustable voltage regulator, a second diode with a positive pole connected to the adjustment end of the three-terminal adjustable voltage regulator and a negative pole connected to the output end of the three-terminal adjustable voltage regulator, a third resistor connected between the adjustment end and the output end of the three-terminal adjustable voltage regulator, and a third capacitor connected between the dimming power supply and the power ground, and the other end of the second resistor is connected to the switching sub-circuit.

[0006] The indicator light day and night switching dimming circuit provided by the present invention also has the following technical features: the switching sub-circuit also includes a first resistor connected between the day and night switching signal and the positive input terminal of the relay and a first capacitor connected between the positive input terminal of the relay and the power ground; the negative input terminal of the relay is connected to the power ground, the output 2A port is connected to the dimming sub-circuit, and the output 2 port is connected to the power ground.

[0007] The indicator light day and night switching dimming circuit provided by the present invention also has the following technical characteristics: in the day mode, the day and night switching signal inputs a low-level signal, the relay is released, and the switching sub-circuit is not connected to the regulating sub-circuit.

[0008] The indicator light day-night switching dimming circuit provided by the present invention also has the following technical features: in the night mode, the day-night switching signal inputs a high-level signal, the relay is energized, and the switching sub-circuit is connected to the regulating sub-circuit.

[0009] The indicator light day and night switching dimming circuit provided by the present invention also has the following technical features: the adjustment voltage V of the dimming circuit in the day mode is TG昼 for:

[0010] V TG昼 =1.25×(1+R4 / R3),

[0011] Wherein, R3 is the resistance value of the third resistor, and R4 is the resistance value of the variable resistor.

[0012] The indicator light day and night switching dimming circuit provided by the present invention also has the following technical features: the adjustment voltage V of the dimming circuit in the night mode is TG夜 for:

[0013] V TG夜 =1.25×(1+((R4+R2) / (R4×R2)) / R3),

[0014] Wherein, R2 is the resistance value of the second resistor, R3 is the resistance value of the third resistor, and R4 is the resistance value of the variable resistor.

[0015] Beneficial Effects

[0016] The indicator light day and night switching dimming circuit proposed in the present invention realizes brightness adjustment and day and night mode switching of the working status information indicator light and the redundancy information indicator light of the autopilot system, the automatic throttle system and the elevator adjustment mechanism. The circuit is simple, practical and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 The schematic diagram of the circuit provided by the present invention. DETAILED DESCRIPTION

[0019] The present application is further described in detail below in conjunction with the accompanying drawings and examples, but it should be noted that these implementation methods are not limitations of the present application, and equivalent changes or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these implementation methods are all within the scope of protection of the present application.

[0020] In the description of the embodiments of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the creation of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the creation of the present application.

[0021] In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0022] The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention of this application can be understood by specific circumstances.

[0023] like Figure 1 As shown, an embodiment of the present application provides a day and night switching dimming circuit for an indicator light, characterized in that the circuit includes: a dimming sub-circuit and a switching sub-circuit connected to the dimming sub-circuit for day and night switching, in the day mode, the switching sub-circuit is disconnected, and only the dimming sub-circuit works for dimming in the day mode; in the night mode, the switching sub-circuit is connected to the dimming circuit, and the switching sub-circuit cooperates with the dimming sub-circuit to work for dimming in the night mode, and the switching sub-circuit includes a relay for switching.

[0024] In some embodiments, the dimming sub-circuit includes a three-terminal adjustable voltage regulator U1, a second resistor R2 connected to the adjustment end of the three-terminal adjustable voltage regulator U1, a variable resistor R4 connected between the adjustment end of the three-terminal adjustable voltage regulator U1 and the power ground, a second capacitor C2 connected between the input end of the three-terminal adjustable voltage regulator U1 and the 28V power supply, a first diode D1 having a positive electrode connected to the output end of the three-terminal adjustable voltage regulator U1 and a negative electrode connected to the input end of the three-terminal adjustable voltage regulator U1, a second diode D2 having a positive electrode connected to the adjustment end of the three-terminal adjustable voltage regulator U1 and a negative electrode connected to the output end of the three-terminal adjustable voltage regulator U1, a third resistor R3 connected between the adjustment end and the output end of the three-terminal adjustable voltage regulator U1, and a third capacitor C3 connected between the dimming power supply and the power ground, and the other end of the second resistor R2 is connected to the switching sub-circuit.

[0025] In some embodiments, the switching sub-circuit also includes a first resistor R1 connected between the day / night switching signal and the positive input terminal of the relay JDQ1 and a first capacitor C1 connected between the positive input terminal of the relay JDQ1 and the power ground. The negative input terminal of the relay JDQ1 is connected to the power ground, the output 2A port is connected to the dimming sub-circuit, and the output 2 port is connected to the power ground.

[0026] In some embodiments, in the day mode, the day / night switching signal inputs a low level signal, the relay is released, and the switching sub-circuit is not connected to the regulating sub-circuit.

[0027] In some embodiments, in the night mode, the day / night switching signal inputs a high level signal, the relay is energized, and the switching sub-circuit is connected to the regulating sub-circuit.

[0028] In some embodiments, the adjustment voltage V of the dimming circuit in the day mode is TG昼 for:

[0029] V TG昼 =1.25×(1+R4 / R3),

[0030] Wherein, R3 is the resistance value of the third resistor, and R4 is the resistance value of the variable resistor.

[0031] In some embodiments, the adjustment voltage V of the dimming circuit in the night mode is TG夜 for:

[0032] V TG夜 =1.25×(1+((R4+R2) / (R4×R2)) / R3),

[0033] Wherein, R2 is the resistance value of the second resistor, R3 is the resistance value of the third resistor, and R4 is the resistance value of the variable resistor.

[0034] The working process of the circuit provided in the above embodiment is as follows:

[0035] When the automatic flight control board is in the "day mode" state, the day / night switching signal Ctr l is at a low level, the relay JDQ1 is released, and at the same time, the resistor R2 is not connected to the adjustment end of the three-terminal adjustable regulator U1. The output voltage of the three-terminal adjustable regulator U1 is changed by adjusting the resistance value of the variable resistor R1, so as to adjust the voltage applied to both ends of the indicator light to change the brightness of the indicator light.

[0036] When the automatic flight control board is in the "night mode" state, the day / night switching signal Ctr l is at a high level, the relay JDQ1 is energized, and at the same time, the resistor R2 is connected to the adjustment end of the three-terminal adjustable regulator U1. The output voltage of the three-terminal adjustable regulator U1 is changed by adjusting the resistance value of the variable resistors R4 and R2 in parallel, so as to adjust the voltage applied to both ends of the indicator light to change the brightness of the indicator light.

[0037] The working principle of the circuit provided in the above embodiment is as follows:

[0038] The "day mode" and "night mode" of the indicator light of the automatic flight control board are switched by releasing and attracting the relay JDQ1. In the "day mode" mode, the resistance value of the adjustment end of the three-terminal adjustable voltage regulator is adjusted to change the voltage applied to both ends of the indicator light between "27.5V and 14.5V". In the "night mode" mode, the resistance value of the adjustment end of the three-terminal adjustable voltage regulator is adjusted to change the voltage applied to both ends of the indicator light between "14.5V and 9V", so that the indicator light of the flight control board can achieve brightness adjustment in two modes.

[0039] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A day and night switching dimming circuit for an indicator light, characterized in that: The circuit includes: a dimming subcircuit and a switching subcircuit connected to the dimming subcircuit for switching between day and night. In the day mode, the switching subcircuit is disconnected, and only the dimming subcircuit works for dimming in the day mode; in the night mode, the switching subcircuit is connected to the dimming circuit, and the switching subcircuit cooperates with the dimming subcircuit to work for dimming in the night mode, and the switching subcircuit includes a relay for switching.

2. The indicator light day and night switching dimming circuit according to claim 1, characterized in that: The dimming sub-circuit includes a three-terminal adjustable voltage regulator, a second resistor connected to the adjustment end of the three-terminal adjustable voltage regulator, a variable resistor connected between the adjustment end of the three-terminal adjustable voltage regulator and the power ground, a second capacitor connected between the input end of the three-terminal adjustable voltage regulator and the 28V power supply, a first diode with a positive electrode connected to the output end of the three-terminal adjustable voltage regulator and a negative electrode connected to the input end of the three-terminal adjustable voltage regulator, a second diode with a positive electrode connected to the adjustment end of the three-terminal adjustable voltage regulator and a negative electrode connected to the output end of the three-terminal adjustable voltage regulator, a third resistor connected between the adjustment end and the output end of the three-terminal adjustable voltage regulator, and a third capacitor connected between the dimming power supply and the power ground, and the other end of the second resistor is connected to the switching sub-circuit.

3. The indicator light day and night switching dimming circuit according to claim 1, characterized in that: The switching subcircuit also includes a first resistor connected between the day / night switching signal and the positive input terminal of the relay and a first capacitor connected between the positive input terminal of the relay and the power ground. The negative input terminal of the relay is connected to the power ground, the output 2A port is connected to the dimming subcircuit, and the output 2 port is connected to the power ground.

4. The indicator light day and night switching dimming circuit according to claim 1, characterized in that: In the day mode, the day / night switching signal inputs a low level signal, the relay is released, and the switching sub-circuit is not connected to the regulating sub-circuit.

5. The indicator light day and night switching dimming circuit according to claim 1, characterized in that: In the night mode, the day / night switching signal inputs a high level signal, the relay is energized, and the switching sub-circuit is connected to the regulating sub-circuit.

6. The indicator light day and night switching dimming circuit according to claim 1, characterized in that: The dimming circuit adjusts the voltage V in the day mode. TG昼 for: V TG昼 =1.25×(1+R4 / R3), Wherein, R3 is the resistance value of the third resistor, and R4 is the resistance value of the variable resistor.

7. The indicator light day and night switching dimming circuit according to claim 1, characterized in that: The dimming circuit adjusts the voltage V in night mode. TG夜 for: V TG夜 =1.25×(1+((R4+R2) / (R4×R2)) / R3), Wherein, R2 is the resistance value of the second resistor, R3 is the resistance value of the third resistor, and R4 is the resistance value of the variable resistor.

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