Cabin lighting potentiometer circuit, cabin lighting control device and method

Abstract

The present invention relates to a cockpit lighting potentiometer circuit, a cockpit lighting control device and a method, comprising a potentiometer power supply reference unit, a first voltage follower, a second voltage follower and a potentiometer. The beneficial effects of the present invention are as follows: when a pure hardware circuit adjusts the cockpit lighting brightness, a brightness dimming curve adapted to human eye perception is configured within a certain interval of the potentiometer power supply voltage, and the brightness is prevented from changing approximately linearly within the interval.

Description

Technical Field

[0001] The invention relates to a cabin lighting dimming system, a cabin lighting potentiometer circuit, a cabin lighting control device and a method. Background Art

[0002] At present, in the aircraft cabin lighting dimming system, in order to give the pilot a comfortable lighting brightness adjustment experience during the day and night, the slope of the dimming curve is different during the day and night. Because the surrounding environment is dark at night, the human eye is more sensitive to the brightness of the light, and the human eye will feel a big difference with a small brightness change; but during the day, the surrounding light is brighter, and the human eye will feel the difference with a larger brightness change. Therefore, today's aircraft cabin lighting dimming curve is more adapted to the sensory experience of the human eye. Under low brightness conditions at night, the light brightness changes slowly when the potentiometer Rs is adjusted; under high brightness conditions during the day, the light brightness changes more obviously when the potentiometer Rs is adjusted, so the dimming curve changes in an exponential form.

[0003] However, in aircraft cabin lighting, the voltage value of the dimming curve is generally adjusted from 0V to the power supply voltage of the potentiometer Rs. When the potentiometer Rs built with a pure hardware circuit is used to adjust the brightness, a dimming curve that is more in line with the sensory experience of the human eye can be configured. However, when the potentiometer Rs is adjusted to full scale within a certain range of the power supply voltage, after configuring the upper and lower voltage divider resistors to achieve the required voltage range, the resulting brightness curve is approximately a straight line, which does not meet the needs of the human eye and the effect is not ideal. Summary of the invention

[0004] The present invention provides a cockpit lighting potentiometer circuit, a cockpit lighting control device and a method, which can better realize a brightness change curve that conforms to the human eye through a simple hardware circuit.

[0005] In order to achieve this purpose, the technical solution of the present invention is as follows: a cockpit lighting potentiometer circuit, comprising a potentiometer power supply reference unit, a first voltage follower, a second voltage follower and a potentiometer, the output end of the potentiometer power supply reference unit is respectively connected to the first end of the resistor R1 and the first end of the resistor R3, the second end of the resistor R1 is respectively connected to the first end of the resistor R2 and the in-phase end of the first voltage follower, the second end of the resistor R2 is grounded, the output end of the first voltage follower is connected to the upper arm voltage end of the potentiometer, the second end of the resistor R3 is respectively connected to the first end of the resistor R4 and the in-phase end of the second voltage follower, the second end of the resistor R4 is grounded, the output end of the second voltage follower is connected to the lower arm voltage end of the potentiometer, and the adjustment end of the potentiometer is the adjustment voltage output end.

[0006] The present invention also provides a cockpit lighting control device, which includes a filtering / surge processing circuit, a voltage conversion circuit, a step-down driving circuit and the above-mentioned potentiometer circuit.

[0007] As a preferred solution for the cabin lighting control device, the filtering / surge processing circuit is used to filter / surge process the aircraft power supply voltage from the outside, and the voltage conversion circuit is used to convert the aircraft power supply voltage processed by the filtering / surge processing circuit and provide it to the potentiometer power supply reference unit.

[0008] The present invention also provides a cockpit lighting control method, comprising the following steps:

[0009] Providing the above-mentioned cockpit lighting control device;

[0010] The filtering / surge processing circuit is used for filtering / surge processing the aircraft power supply voltage from the outside, and the voltage conversion circuit is used for converting the aircraft power supply voltage processed by the filtering / surge processing circuit and providing it to the potentiometer power supply reference unit;

[0011] The reference voltage U3 provided by the potentiometer power supply reference unit is divided into two paths, one path is proportionally divided by resistors R1 and R2 to obtain a voltage value Ua, and the other path is proportionally divided by resistors R3 and R4 to obtain a voltage value Ub; the voltage values ​​Ua and Ub are respectively used as input signals of the in-phase input terminals of the first voltage follower and the second voltage follower, and their output voltage values ​​are Ua1 and Ub1 as limiting voltages at both ends of the potentiometer.

[0012] Compared with the prior art, the technical effect of the present invention is: by using the potentiometer R s The design method of power supply reference circuit, voltage ratio distribution and voltage follower effectively solves the problem of adjusting the cabin lighting brightness by pure hardware circuit. s Within a certain interval of the supply voltage, a brightness dimming curve adapted to human eye perception is configured, thereby avoiding approximately linear changes in brightness within the interval. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The figure is a schematic structural diagram of a cockpit lighting control device according to an embodiment of the present invention.

[0014] Figure 2 The figure is a block diagram of a circuit for changing the dimming voltage range in one embodiment of the present invention.

[0015] Figure 3 This is a circuit diagram of a potentiometer adjusting voltage limit range in one embodiment of the present invention.

[0016] Figure 4 FIG. 1 is a potentiometer adjustment circuit diagram in one embodiment of the present invention. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below by means of specific embodiments in combination with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0018] See also Figures 1 to 3 After the normal power supply U1 of the aircraft processed by the filter and surge suppressor passes through the voltage conversion circuit, the output voltage is U2, which is used as the power supply voltage of the reference circuit of the potentiometer Rs. The output voltage U3 of the reference circuit is proportionally divided by resistors R1 and R2 to obtain the voltage value U a The other path is divided proportionally through R3 and R4 to obtain the voltage value U b These two voltages are used as the same-direction input signals of voltage followers 1 and 2 respectively, and the output voltage values ​​are As potentiometer R s The limiting voltage at both ends. The resistor R connected in parallel with the potentiometer Rs x (Resistors used to configure the brightness curve that adapts to human eye perception) The resistance value can be changed according to the different perceptions of different human eyes. If you want to adjust the brightness within a certain range between 0V and U3, you need to change the resistance values ​​of R1, R2, R3 and R4, and then change the corresponding proportion distribution, and finally get the changed U a , U b , and then through the voltage follower to get

[0019] See also Figure 4 If two voltage followers are not connected, the resistor R x1 , R x2 Connected to potentiometer R s The upper and lower ends of the proportional voltage are divided, although the corresponding limiting voltage can be obtained However, when the potentiometer Rs is adjusted, R x With resistor R s2 The total resistance value will change accordingly, and the proportional voltage division will will also change, and finally the output voltage U of the potentiometer Rs adjustment end X will be affected, so that the output voltage U X All the points formed by the adjustment knob range will converge into a straight line instead of an exponential curve.

[0020] Because the voltage value at both ends is fixed when the potentiometer Rs is adjusted from 0V to U3, the brightness curve formed is consistent with human eye perception. The brightness curve formed in this voltage range is approximately the same as the brightness curve formed by adjusting between 0V and U3, which is consistent with the human eye's perception of brightness and improves the flexibility of adjusting lighting brightness during day and night. s Within the power supply reference voltage, changing the voltage divider resistor ratio before the voltage follower can achieve the potentiometer R s Dimming is performed according to an exponential curve within different ranges.

[0021] The above only expresses the implementation method of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. Cabin lighting potentiometer circuit, characterized in that, The invention comprises a potentiometer power supply reference unit, a first voltage follower, a second voltage follower and a potentiometer, wherein the output end of the potentiometer power supply reference unit is respectively connected to the first end of a resistor R1 and the first end of a resistor R3, the second end of the resistor R1 is respectively connected to the first end of a resistor R2 and the in-phase end of the first voltage follower, the second end of the resistor R2 is grounded, the output end of the first voltage follower is connected to the upper arm voltage end of the potentiometer, the second end of the resistor R3 is respectively connected to the first end of a resistor R4 and the in-phase end of the second voltage follower, the second end of the resistor R4 is grounded, the output end of the second voltage follower is connected to the lower arm voltage end of the potentiometer, and the regulating end of the potentiometer is the regulating voltage output end; the reference voltage U3 provided by the potentiometer power supply reference unit is divided into two paths, one path is proportionally divided by the resistor R1 and the resistor R2 to obtain the voltage value Ua, and the other path is proportionally divided by the resistor R3 and the resistor R4 to obtain the voltage value Ub; the voltage values ​​Ua and Ub are respectively used as input signals of the in-phase input ends of the first voltage follower and the second voltage follower, and the output voltage values ​​thereof are Ua1 and Ub1 as the limiting voltages at both ends of the potentiometer.

2. A cockpit lighting control device, comprising a filtering / surge processing circuit, a voltage conversion circuit and a step-down drive circuit, characterized in that: Also included is the potentiometer circuit as claimed in claim 1.

3. The cockpit lighting control device according to claim 2, characterized in that: The filtering / surge processing circuit is used for filtering / surge processing the aircraft power supply voltage from the outside, and the voltage conversion circuit is used for converting the aircraft power supply voltage processed by the filtering / surge processing circuit and providing it to the potentiometer power supply reference unit.

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