Backlight driving circuit of remote controller

Abstract

The utility model provides a remote controller backlight drive circuit, and belongs to the field of remote controller circuits. The remote controller backlight drive circuit comprises a boost control circuit, a boost circuit and a backlight control circuit, an input end of the boost control circuit is connected with an output end of a battery, an output end of the boost control circuit is connected with the boost circuit, and the backlight control circuit is connected with the boost circuit. The control ends of the boost control circuit and the backlight lamp control circuit are connected with the controller, the input end of the boost circuit is connected with the backlight lamp control circuit, and the backlight lamp control circuit outputs boosted stable voltage to a backlight lamp. The LED lamp has the advantages of being stable in light emitting and improving the utilization rate of a battery.

Description

Technical Field

[0001] The utility model relates to the field of remote control circuits, in particular to a remote control backlight driving circuit. Background Art

[0002] Generally, there is no backlight in the remote control. The remote control consists of a controller and multiple different buttons, which are directly powered by batteries. When not working, no current flows. The circuit is simple and the power consumption is low. However, in order to facilitate users to clearly see the buttons on the remote control at night when the light is insufficient, the manufacturer has launched a remote control with a backlight, and then directly powers the backlight from the battery to control the lighting of the backlight. Directly powered by batteries, on the one hand, the voltage is unstable. As the battery power is consumed, there is a situation where the battery still has power but the backlight is not on. At this time, the battery needs to be replaced, which undoubtedly causes energy waste. Utility Model Content

[0003] In order to solve the problems in the prior art, the utility model provides a remote control backlight driving circuit.

[0004] The utility model discloses a remote control backlight driving circuit, comprising a boost control circuit, a boost circuit and a backlight control circuit, wherein the input end of the boost control circuit is connected to the output end of a battery, the output end of the boost control circuit is connected to the boost circuit, the control ends of the boost control circuit and the backlight control circuit are connected to a controller, the input end of the boost circuit is connected to the backlight control circuit, and the backlight control circuit outputs a boosted stable voltage to the backlight.

[0005] Furthermore, it also includes a battery power supply branch, the input end of the battery power supply branch is connected to the battery output end, and the output end is connected to the input end of the backlight control circuit.

[0006] Furthermore, the boost control circuit includes a switch tube Q4, a resistor R25, a resistor R28 and a resistor R27, wherein the source of the switch tube Q4 is connected to the battery output end, the drain of the switch tube Q4 outputs the supply voltage VCC through the resistor R27, one end of the resistor R25 is connected to the battery output end, one end of the resistor R28 is connected to the gate of the switch tube Q4, and the other end of the resistor R25 and the other end of the resistor R28 are respectively connected to the first control end of the controller.

[0007] Furthermore, the boost circuit comprises an input filter unit, a boost unit, and an output filter unit which are sequentially arranged according to the current direction, and the boost unit adopts a boost chip or a boost circuit.

[0008] Furthermore, the boost circuit includes a boost converter U3 and an inductor L4, wherein pin 1 of the boost converter U3 is grounded, pin 2 is connected to one end of the inductor L4, the other end of the inductor L4 is connected to the output end of the input filter unit, and pin 3 of the boost converter U3 is connected to the input end of the output filter unit.

[0009] Furthermore, the backlight control circuit includes a resistor R23, a resistor R66, and a transistor Q11, wherein the base of the transistor Q11 is connected to the second control terminal of the controller via the resistor R23, one end of the resistor R66 is grounded, and the other end is connected between the resistor R23 and the base of the transistor Q11.

[0010] Furthermore, it also includes a light detection sensor, the output end of the light detection sensor is connected to the input end of the controller, and the second control end of the controller can output a PWM signal for controlling the brightness of the backlight according to the light detection sensor.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention converts the battery voltage into a stable voltage output by setting a driving circuit, thereby improving the luminous stability of the backlight, and even when the battery voltage is low, the battery voltage can be boosted to a voltage capable of driving the backlight through a boost circuit, thereby effectively improving the battery utilization rate.

[0012] By setting a switch tube before the boost circuit, when the switch tube is turned off, the battery has no output, which reduces the power consumption of the remote control. By setting a fiber optic sensor, the light level is reduced to a certain level before it is turned on, and the brightness of the backlight is controlled according to the brightness of the light, which further reduces the power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 This is the structural diagram of the utility model;

[0015] Figure 2 This is the principle diagram of the boost control circuit of the utility model;

[0016] Figure 3 This is a circuit schematic diagram of an embodiment of a boost circuit of the utility model;

[0017] Figure 4This is a circuit schematic diagram of an embodiment of a backlight control circuit of the utility model. DETAILED DESCRIPTION

[0018] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by technicians in the technical field of the present invention; the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0019] Reference to "embodiments" in the present invention means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive, independent, or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present invention may be combined with other embodiments.

[0020] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0021] like Figure 1 As shown, the utility model remote control backlight driving circuit includes a boost control circuit, a boost circuit, and a backlight control circuit, wherein the input end of the boost control circuit is connected to the battery output end, the output end of the boost control circuit is connected to the boost circuit, the control end of the boost control circuit and the backlight control circuit is connected to a controller, the input end of the boost circuit is connected to the backlight control circuit, and the backlight control circuit outputs a boosted stable voltage to the backlight.

[0022] The utility model converts the battery voltage into a stable voltage output by setting a driving circuit, thereby avoiding the unstable lighting of the existing backlight panel. The utility model can improve the lighting stability of the backlight, and even if the battery voltage is low, the battery voltage can be boosted to a voltage capable of driving the backlight through the boost circuit, effectively improving the battery utilization rate. A boost control circuit is set in front of the boost circuit, and when the backlight does not need to be turned on, the battery has no output, thereby reducing power consumption.

[0023] In addition, the utility model is also provided with a spare battery power supply branch circuit, the input end of the battery power supply branch circuit is connected to the battery output end, and the output end is connected to the input end of the backlight control circuit.

[0024] The existing battery is directly used for power supply as a backup and is set on the circuit board. When installed in the product, the backlight can be driven by the battery or by the boost circuit of the utility model according to customer needs, and the compatibility is good.

[0025] like Figure 2 As shown, the boost control circuit of this example includes a switch tube Q4, a resistor R25, a resistor R28 and a resistor R27, wherein the source of the switch tube Q4 is connected to the battery output terminal, the drain of the switch tube Q4 outputs the power supply voltage VCC through the resistor R27, one end of the resistor R25 is connected to the battery output terminal, one end of the resistor R28 is connected to the gate of the switch tube Q4, and the other end of the resistor R25 and the other end of the resistor R28 are respectively connected to the first control terminal of the controller.

[0026] like Figure 3 As shown, the boost circuit includes an input filter unit, a boost unit, and an output filter unit which are sequentially arranged according to the current direction. The boost unit adopts a boost chip or various boost circuits.

[0027] Preferably, the boost unit of this example uses a boost circuit, which has a simple structure and uses an XT1861B332MR boost converter U3 and an inductor L4 with only three pins, and has lower power consumption. Pin 1 of the boost converter U3 in the boost circuit of this example is grounded, and pin 2 is connected to one end of the inductor L4, and the other end of the inductor L4 is connected to the output end of the input filter unit, and pin 3 of the boost converter U3 is connected to the input end of the output filter unit.

[0028] like Figure 4 As shown, the backlight control circuit of this example includes a resistor R23, a resistor R66, and a transistor Q11. The base of the transistor Q11 is connected to the second control end of the controller through the resistor R23. One end of the resistor R66 is grounded, and the other end is connected between the resistor R23 and the base of the transistor Q11.

[0029] This example works like this:

[0030] When the backlight needs to be turned on, the backlight button can be pressed, and the first output terminal of the controller outputs a low level, which lowers the level of the switch tube Q4. The switch tube Q4 is a PMOS tube, which is turned on at a low level. The battery voltage outputs the voltage VCC through the switch tube Q4 to the subsequent boost circuit, and the resistor R25 and the resistor R28 provide a default high level for the switch tube Q4.

[0031] The voltage VCC is filtered by capacitors C36 and C62, and then output to inductor L4 and boost converter U3, where it is boosted to 3.3V. It is then filtered by capacitor C61 at the output end and a stable 3.3V voltage is output to the backlight control circuit.

[0032] In the default state, the base of transistor Q11 is pulled down and disconnected by resistor R66. When the backlight is turned on, the second output terminal of the controller outputs a high level to the base of transistor Q11, controlling transistor Q11 to be turned on, turning on the power of the backlight LED, and the backlight emits light.

[0033] Preferably, in this example, a light detection sensor may be further provided, the output end of the light detection sensor being connected to the input end of the controller, and the second control end of the controller being able to output a PWM signal for controlling the brightness of the backlight according to the light detection sensor.

[0034] Under the premise of turning on the backlight, the brightness of the external light is detected by the light detection sensor, and the controller outputs the PWM duty cycle to control the display brightness of the backlight and reduce power consumption.

[0035] Preferably, in this example, the backlight can be set to light up for a period of time, such as 5 seconds of operation time, and the rest of the time it is in a dormant state, to further reduce power consumption. Or it can be used in conjunction with a vibration sensor, so that when the remote control is detected to be picked up, it will light up, and the rest of the time it will be in a dormant state, to avoid excessive battery consumption.

[0036] The specific implementation methods described above are preferred implementation methods of the present utility model, and are not intended to limit the specific implementation scope of the present utility model. The scope of the present utility model includes but is not limited to the specific implementation methods. All equivalent changes made in accordance with the present utility model are within the protection scope of the present utility model.

Claims

1. A remote control backlight driving circuit, characterized in that: It includes a boost control circuit, a boost circuit, and a backlight control circuit, wherein the input end of the boost control circuit is connected to the battery output end, the output end of the boost control circuit is connected to the boost circuit, the control ends of the boost control circuit and the backlight control circuit are connected to a controller, the input end of the boost circuit is connected to the backlight control circuit, and the backlight control circuit outputs a boosted stable voltage to the backlight.

2. The remote controller backlight driving circuit according to claim 1, characterized in that: It also includes a battery power supply branch, the input end of the battery power supply branch is connected to the battery output end, and the output end is connected to the input end of the backlight control circuit.

3. The remote controller backlight driving circuit according to claim 1, characterized in that: The boost control circuit includes a switch tube Q4, a resistor R25, a resistor R28 and a resistor R27, wherein the source of the switch tube Q4 is connected to the battery output end, the drain of the switch tube Q4 outputs the power supply voltage VCC through the resistor R27, one end of the resistor R25 is connected to the battery output end, one end of the resistor R28 is connected to the gate of the switch tube Q4, and the other end of the resistor R25 and the other end of the resistor R28 are respectively connected to the first control end of the controller.

4. The remote controller backlight driving circuit according to claim 3, characterized in that: The boost circuit comprises an input filter unit, a boost unit, and an output filter unit which are sequentially arranged according to the current direction. The boost unit adopts a boost chip or a boost circuit.

5. The remote controller backlight driving circuit according to claim 4, characterized in that: The boost circuit includes a boost converter U3 and an inductor L4, wherein pin 1 of the boost converter U3 is grounded, pin 2 is connected to one end of the inductor L4, the other end of the inductor L4 is connected to the output end of the input filter unit, and pin 3 of the boost converter U3 is connected to the input end of the output filter unit.

6. The remote controller backlight driving circuit according to claim 1, characterized in that: The backlight control circuit includes a resistor R23, a resistor R66, and a transistor Q11. The base of the transistor Q11 is connected to the second control terminal of the controller through the resistor R23. One end of the resistor R66 is grounded, and the other end is connected between the resistor R23 and the base of the transistor Q11.

7. The remote controller backlight driving circuit according to claim 6, characterized in that: It also includes a light detection sensor, the output end of which is connected to the input end of the controller, and the second control end of the controller can output a PWM signal for controlling the brightness of the backlight according to the light detection sensor.

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