TWI429321B - Ir remote controller with ir current controlled by the working voltage and method thereof - Google Patents

Description

Remote controller for adjusting infrared current by working voltage and method thereof

The present invention relates to an infrared remote control technology, and more particularly to a remote control for adjusting an infrared current by an operating voltage and a method for adjusting the intensity of an infrared signal by an operating voltage.

The remote control can be said to be everywhere, and it can even be said that the remote control has already reached the normal life. Go back home to open the garage door with a remote control, use the remote control to lock the car, go to the house and turn on the TV to select the program, also use the remote control, open the air conditioner with the remote control, open the audio and listen to music after the meal, also use the remote control, so say remote control Removing it from your life will definitely affect your daily life.

The remote control has been around for a long time. The initial remote control was operated by ultrasonic waves. Later, due to the available materials and technology, the ultrasonic remote control was gradually fading, and finally replaced by infrared rays. The infrared light-emitting diode and the integrated circuit were encoded. Modification, receiving and decoding modularization, infrared remote control has been widely used in large and small consumer electronic products, such as televisions, video recorders, audio, air-conditioning.

Figure 1 is a circuit block diagram of a prior art infrared remote controller. Referring to FIG. 1 , the infrared remote controller includes a microprocessor 101 , a button set 102 , a battery 103 , a switch 104 , a resistor R101 , a transistor T101 , and an infrared light emitting diode D101 . The battery 103 is used to supply electric power. The user controls the remote control by operating a button in the button set 102. The microprocessor 101 is operative to determine a signal to be output to the transistor T101 based on the button pressed in the button group 102. The conventional remote controller is directly driven by an external or built-in transistor T101 for the infrared emitter, and the current control is mostly performed by the current limiting resistor R101. In this way, when the battery is relatively low, the power supply voltage is unstable due to the driving current of the infrared diode D101, and the remote controller cannot be used.

An object of the present invention is to provide a remote controller for adjusting an infrared current by an operating voltage and a method for adjusting the intensity of an infrared signal by an operating voltage for detecting a power supply voltage to control the current of the infrared emitter to maintain a maximum The equilibrium point at which the current can be emitted. In this way, the signal can still be transmitted under the low voltage state, and although the transmission distance is shortened, the use time can be extended.

In view of this, the present invention provides a remote controller that adjusts an infrared current by an operating voltage. The remote controller for adjusting the infrared current by the operating voltage includes at least one battery, an infrared light emitting diode, a current control LED output driving circuit, a button group, a microprocessor, and a power detecting circuit. The battery is used to supply a power supply voltage. The infrared light emitting diode includes a first end and a second end, and the first end of the infrared light emitting diode is coupled to a power supply voltage. The current-controlled light-emitting diode output driving circuit is coupled to the second end of the infrared light-emitting diode for driving the infrared light-emitting diode and controlling the current flowing through the infrared light-emitting diode. The button set includes at least one button.

The microprocessor is coupled to the button group and the current control LED output driving circuit for outputting a control signal to the current control LED output driving circuit according to a button pressed by a user to determine the above The output signal of the infrared light emitting diode. The power detection circuit is coupled to the battery and the current control LED output drive circuit for monitoring the magnitude of the power supply voltage, and transmitting a power value to the current control LED output drive circuit according to the magnitude of the power supply voltage. When the power supply voltage is lower than a predetermined threshold, the current control LED output driving circuit reduces the current flowing through the infrared light emitting diode according to the magnitude of the power supply voltage, so as to reduce the intensity of the output signal of the infrared light emitting diode. .

According to a preferred embodiment of the preferred embodiment of the present invention, a remote control for adjusting an infrared current by an operating voltage includes a reference voltage generator and an amplifier. The reference voltage generator is used to generate a reference voltage. The amplifier includes a first input end, a second input end, and an output end, wherein the first input end is coupled to the reference voltage generator to receive the reference voltage, and the second input end is coupled to the battery to receive the power supply voltage, The output end is coupled to the current control LED output driving circuit for amplifying the difference between the reference voltage and the power voltage to output a difference amplification signal, wherein the current control LED output driving circuit is The difference amplification signal determines the magnitude of the maximum current flowing through the infrared illuminating diode.

In another embodiment, the power detection circuit includes an analog-to-digital converter including an input terminal and an output terminal, wherein the input terminal is coupled to the battery to receive the power supply voltage, and the output terminal is coupled to the current. Controlling a light emitting diode output driving circuit for converting a value of a power supply voltage into a power supply digital value, wherein the current control LED output driving circuit determines a maximum current flowing through the infrared light emitting diode according to the power source digital value the size of. In addition, in another embodiment, the first end of the infrared light emitting diode is an anode, and the second end of the infrared light emitting diode is a cathode.

The present invention further provides a method of adjusting the intensity of an infrared signal by an operating voltage, wherein the infrared signal is transmitted by a remote controller, and the remote controller has at least one battery. The method for adjusting the intensity of the infrared signal by the working voltage includes the following steps: (a) detecting a power supply voltage of the battery; (b) determining whether the power supply voltage is smaller than a power supply threshold; (c) when the power supply voltage is greater than the power supply. Threshold, returning to step (b); and (d) when the magnitude of the power supply voltage is less than the above-mentioned power supply threshold, the intensity of the infrared signal is adjusted according to the magnitude of the power supply voltage. When the magnitude of the power supply voltage is lower, the intensity of the infrared signal is adjusted to be smaller.

According to the method for adjusting the infrared current by the operating voltage according to the preferred embodiment of the present invention, the step of "adjusting the intensity of the infrared signal according to the magnitude of the power supply voltage when the power supply voltage is smaller than the power supply threshold" includes: when the power supply voltage The size of the power is smaller than the power threshold, and the current flowing through the infrared light emitting diode is adjusted according to the magnitude of the power voltage. The infrared light emitting diode system is configured to emit the infrared signal.

The spirit of the present invention is to adjust the current flowing through the infrared light emitting diode according to the magnitude of the power supply voltage of the battery. When the power supply voltage of the battery is small, the current flowing through the infrared light emitting diode is made small. Since the battery has not been used up in the prior art, it is necessary to change the battery. At this time, usually, the battery also has two to forty percent of power that is not used, resulting in waste. In addition, the battery liquid may leak as a result of damage to the electronic components in the remote controller. The above drawbacks can be improved by the present invention.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

First embodiment

Fig. 2 is a circuit block diagram of a remote controller for adjusting an infrared current by an operating voltage according to a first embodiment of the present invention. Referring to FIG. 2, the infrared remote controller includes an infrared light emitting diode D201, a button group 201, a battery 202, and a remote controller control circuit IC201. The coupling relationship of the circuit of the remote controller is as shown in FIG. 2 . The battery 202 is used to supply a power supply voltage VDD to the remote control circuit IC 201, the infrared light emitting diode D201, and the button group 201. The anode of the infrared illuminating diode D201 is coupled to a power supply voltage VDD. The remote control circuit IC201 is coupled to both ends of the battery 202 for detecting the magnitude of the power supply voltage and determining the magnitude of the current Idrv flowing through the infrared light emitting diode D201.

The remote controller control circuit IC 201 includes a microprocessor 203, a power source detecting circuit 204, and a current controlling light emitting diode output driving circuit 205. The microprocessor 203 is coupled to the button group 201 and the current control LED output driving circuit 205 for outputting a control signal CON to the current control LED output driving circuit 205 according to a button pressed by a user. To determine the output signal of the infrared light-emitting diode D201. The power detecting circuit 204 is coupled to both ends of the battery 202 and the current control LED output driving circuit 205 for monitoring the magnitude of the power voltage VDD, and transmitting a power value PV to the current control light according to the magnitude of the power voltage VDD. The body output drive circuit 205. The current-controlled light-emitting diode output driving circuit 205 drives the infrared light-emitting diode D201 according to the magnitude of the power source value PV, and controls the current Idrv flowing through the infrared light-emitting diode.

Second embodiment

Fig. 3 is a circuit block diagram of a remote controller for adjusting an infrared current by an operating voltage according to a second embodiment of the present invention. Referring to FIG. 3, this second embodiment is different from the above embodiment in that the power supply detecting circuit 204 of this embodiment is implemented using an analog digital converter 301. The analog-to-digital converter 301 is configured to convert the power supply voltage VDD of the battery to a digital value DV, and output to the current-controlled light-emitting diode output driving circuit 205. The current-controlled light-emitting diode output drive circuit 205 determines the magnitude of the maximum drive current Idrv flowing through the infrared light-emitting diode D201 based on the magnitude of the received digital value DV. Generally, the current control LED output driving circuit 205 has a preset threshold value. When the digit value DV is greater than the threshold value, the maximum driving current Idrv does not change when the digit value DV is smaller than this. At the threshold value, the maximum drive current Idrv changes proportionally with the magnitude of the digital value DV.

In addition, in addition to the above manner of changing the maximum driving current Idrv according to the ratio, the current control LED output driving circuit 205 may also preset a plurality of threshold values, for example, the first, second, third, and fourth may be set. Threshold value, where the first threshold value > the second threshold value > the third threshold value > the fourth threshold value. When the digital value DV is greater than the first threshold, the magnitude of the maximum drive current Idrv does not change. When the digital value DV is between the first threshold and the second threshold, the magnitude of the maximum driving current Idrv becomes 3/4 of the original. When the digital value DV is between the second threshold and the third threshold, the magnitude of the maximum driving current Idrv becomes 1/2 of the original. When the digital value DV is between the third threshold and the fourth threshold, the magnitude of the maximum driving current Idrv becomes 1/4 of the original.

Although the above embodiment is exemplified by four threshold values and four current magnitudes, those skilled in the art should know that the magnitude of the current or the threshold value depends on different designs and circuits, and thus the present invention Not limited to this.

Third embodiment

Fig. 4 is a circuit block diagram showing a remote controller for adjusting an infrared current by an operating voltage according to a third embodiment of the present invention. Referring to FIG. 4, the third embodiment is different from the above embodiment in that the power detecting circuit 204 of this embodiment uses an amplifier 401, a first resistor R401, a second resistor R402, and a reference voltage generator 402. Implementation. One end of the first resistor R401 is coupled to the battery 202 to receive the power supply voltage VDD, and the second end of the first resistor R401 is coupled to the second resistor R402 and the positive terminal of the amplifier 401. The other end of the second resistor R402 is connected to the other end of the battery 202. The negative terminal of the amplifier 401 is coupled to the reference voltage generator 402 to receive the reference voltage VREF. When the power supply voltage VDD drops, the difference amplification signal VD outputted by the amplifier 401 is lowered, and the current control LED output driving circuit 205 determines the flow of the infrared light emitting diode according to the magnitude of the received difference amplification signal VD. The size of the maximum drive current Idrv of the body D201.

Fourth embodiment

Fig. 5 is a circuit block diagram of a remote controller for adjusting an infrared current by an operating voltage according to a fourth embodiment of the present invention. Please refer to FIG. 5 first. The infrared remote controller includes an infrared light emitting diode D501, a button group 501, a battery 502, and a remote controller control circuit IC501. The coupling relationship of the circuit of the remote controller is as shown in FIG. The battery 502 is used to supply a power supply voltage VDD to the remote control circuit IC501, the infrared light emitting diode D501, and the button group 501. The anode of the infrared illuminating diode D501 is coupled to a power supply voltage VDD. The remote control circuit IC 501 is coupled to both ends of the battery 502 for detecting the magnitude of the power supply voltage and determining the magnitude of the current Idrv flowing through the infrared light emitting diode D501. The remote controller control circuit IC 501 includes a microprocessor 503, a power source detecting circuit 504, and a current controlling light emitting diode output driving circuit 505.

The circuit of FIG. 5 differs from the circuit of FIG. 1 in that the power supply detecting circuit 504 transmits the power supply value PV to the microprocessor 503, and the microprocessor 503 controls the current control LED output driving circuit 505 to The magnitude of the value PV drives the infrared light emitting diode D501 and controls the current Idrv flowing through the infrared light emitting diode. When the battery power is lower, the power supply value PV will be lower, and therefore the current Idrv flowing through the infrared light-emitting diode D501 is relatively smaller.

Fig. 6 is a block diagram showing a more detailed circuit of Fig. 5 of the fourth embodiment of the present invention. Referring to FIG. 6, this circuit is different from the above circuit in that the power supply detecting circuit 504 is implemented using an analog digital converter 601. Such a ratio digital converter 601 is used to convert the power supply voltage VDD of the battery to a digital value DV and output to the microprocessor 503. The microprocessor 503 uses the digital value DV as the control current to control the data of the LED output driving circuit 505. The microprocessor 503 controls the current control LED output driving circuit 505 according to the magnitude of the received digital value DV to determine the magnitude of the maximum driving current Idrv flowing through the infrared LED D501.

Figure 7 is a block diagram showing a more detailed circuit of Figure 5 of the fourth embodiment of the present invention. Referring to FIG. 7, the third embodiment is different from the above embodiment in that the power detecting circuit 504 of this embodiment uses an amplifier 701, a first resistor R701, a second resistor R702, and a reference voltage generator 702. Implementation. One end of the first resistor R701 is coupled to the battery 502 to receive the power supply voltage VDD, and the second end of the first resistor R701 is coupled to the second resistor R702 and the positive terminal of the amplifier 701. The other end of the second resistor R702 is connected to the other end of the battery 502. The negative terminal of the amplifier 701 is coupled to the reference voltage generator 702 to receive the reference voltage VREF. When the power supply voltage VDD drops, the differential amplification signal VD output by the amplifier 701 is lowered, and the microprocessor 503 controls the current control LED output driving circuit 505 according to the magnitude of the received difference amplification signal VD. The magnitude of the maximum drive current Idrv flowing through the infrared illuminating diode D501 is determined.

Fifth embodiment

Fig. 8 is a flow chart showing a method of adjusting the intensity of the infrared signal by the operating voltage according to the fourth embodiment of the present invention. Please refer to Figure 5, this method includes the following steps:

Step S801: Start.

Step S802: detecting a power supply voltage VDD of the battery.

Step S803: determining whether the magnitude of the power supply voltage VDD is smaller than a power supply threshold. When the determination is YES, step S805 is performed. When the determination is no, step S804 is performed.

Step S804: When the magnitude of the power supply voltage VDD is greater than the power threshold, the signal strength of the infrared light is not adjusted.

Step S805: When the magnitude of the power supply voltage VDD is smaller than the power supply threshold, the intensity of the infrared signal is adjusted according to the magnitude of the power supply voltage VDD, wherein the intensity of the infrared signal is adjusted to be smaller as the magnitude of the power supply voltage VDD is lower.

In summary, the spirit of the present invention is to adjust the current flowing through the infrared light emitting diode according to the magnitude of the power supply voltage of the battery. When the power supply voltage of the battery is small, the current flowing through the infrared light emitting diode is made small. Since the battery has not been used up in the prior art, it is necessary to change the battery. At this time, usually, the battery also has two to forty percent of power that is not used, resulting in waste. In addition, the battery liquid may also leak, resulting in electronic zero in the remote control. Damage to the piece. The above drawbacks can be improved by the present invention.

The specific embodiments of the present invention are intended to be illustrative only and not to limit the invention to the above embodiments, without departing from the spirit of the invention and the following claims. The scope of the invention and the various changes made are within the scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

101, 203‧‧‧Microprocessor

102, 201‧‧‧ button group

103, 202‧‧‧Battery

104‧‧‧ switch

R101‧‧‧resistance

T101‧‧‧O crystal

D101, D201‧‧‧ Infrared light-emitting diode

IC201‧‧‧Remote Control Circuit

VDD‧‧‧Power supply voltage

Idrv‧‧‧current flowing through the infrared light-emitting diode D201

204‧‧‧Power detection circuit

205‧‧‧ Current control LED output drive circuit

CON‧‧‧ control signal

PV‧‧‧ power value

301‧‧‧ analog digital converter

DV‧‧‧ digital value

401‧‧Amplifier

R401‧‧‧First resistance

R402‧‧‧second resistance

402‧‧‧reference voltage generator

VREF‧‧‧reference voltage

S501~S505‧‧‧ steps of the embodiment of the present invention

Figure 1 is a circuit block diagram of a prior art infrared remote controller.

Fig. 2 is a circuit block diagram of a remote controller for adjusting an infrared current by an operating voltage according to a first embodiment of the present invention.

Fig. 3 is a circuit block diagram of a remote controller for adjusting an infrared current by an operating voltage according to a second embodiment of the present invention.

Fig. 4 is a circuit block diagram showing a remote controller for adjusting an infrared current by an operating voltage according to a third embodiment of the present invention.

Fig. 5 is a circuit block diagram of a remote controller for adjusting an infrared current by an operating voltage according to a fourth embodiment of the present invention.

Fig. 6 is a block diagram showing a more detailed circuit of Fig. 5 of the fourth embodiment of the present invention.

Figure 7 is a block diagram showing a more detailed circuit of Figure 5 of the fourth embodiment of the present invention.

Fig. 8 is a flow chart showing a method of adjusting the intensity of the infrared signal by the operating voltage according to the fourth embodiment of the present invention.

203. . . microprocessor

201. . . Button group

202. . . battery

D201. . . Infrared light emitting diode

IC201. . . Remote control circuit

VDD. . . voltage

Idrv. . . Current flowing through the infrared light emitting diode D201

204. . . Power detection circuit

205. . . Current control LED output drive circuit

CON. . . control signal

PV. . . Power value

Claims (18)

A remote controller for adjusting an infrared current by a working voltage, comprising: at least one battery for supplying a power voltage; and an infrared light emitting diode comprising a first end and a second end, the first end of which is coupled to the first end a current control light emitting diode output driving circuit coupled to the second end of the infrared light emitting diode for driving the infrared light emitting diode and controlling a current flowing through the infrared light emitting diode; a button group, comprising at least one button; a microprocessor coupled to the button group and the current control LED output driving circuit for outputting a control signal to the current according to a button pressed by a user Controlling a light emitting diode output driving circuit to determine an output signal of the infrared light emitting diode; and a power detecting circuit coupled to the battery and the current control light emitting diode output driving circuit for monitoring the power voltage Size, and according to the magnitude of the power supply voltage, transmitting a power value to the current control LED output drive circuit, wherein, when the power supply voltage The current-controlled light-emitting diode output driving circuit reduces the current flowing through the infrared light-emitting diode according to the magnitude of the power supply voltage to reduce the intensity of the output signal of the infrared light-emitting diode. . Adjusted by working voltage as stated in item 1 of the patent application scope a remote control device for infra-red current, wherein the power detection circuit includes: a reference voltage generator for generating a reference voltage; and an amplifier including a first input terminal, a second input terminal, and an output terminal, wherein The first input end is coupled to the reference voltage generator to receive the reference voltage, the second input end is coupled to the battery to receive the power supply voltage, and the output end is coupled to the current control LED output drive circuit. Amplifying the difference between the reference voltage and the power supply voltage to output a difference amplification signal, wherein the current control LED output driving circuit determines the flow of the infrared light emitting diode according to the difference amplification signal The size of the maximum current. A remote controller for adjusting an infrared current by an operating voltage as recited in claim 1, wherein the power detecting circuit comprises: an analog-to-digital converter comprising an input end and an output end, wherein the input end is coupled The battery is configured to receive the power supply voltage, and the output end is coupled to the current control LED output driving circuit for converting the value of the power voltage into a power digital value, wherein the current control LED output drive The circuit determines the magnitude of the maximum current flowing through the infrared light emitting diode based on the power supply digital value. A remote controller for adjusting an infrared current by a working voltage as recited in claim 1 of the patent application, wherein the infrared light emitting diode is first The end is an anode, and the second end of the infrared light emitting diode is a cathode. A remote control circuit for controlling a remote controller, wherein the remote controller includes a battery for supplying a power voltage, an infrared light emitting diode, and a button group, wherein the infrared light emitting diode The one end of the infrared light emitting diode is coupled to the second end of the infrared light emitting diode. The remote control circuit includes a current control LED output driving circuit coupled to the second end of the infrared light emitting diode. The driving of the infrared light emitting diode and controlling the current flowing through the infrared light emitting diode; a microprocessor coupled to the button group and the current control LED output driving circuit for use according to one Pressing a button, outputting a control signal to the current control LED output drive circuit to determine an output signal of the infrared LED; and a power detection circuit coupled to the battery and the current control illumination a diode output driving circuit for monitoring the magnitude of the power supply voltage, and transmitting a power value to the current control according to the magnitude of the power supply voltage a light emitting diode output driving circuit, wherein when the power supply voltage is lower than a predetermined threshold, the current control LED output driving circuit reduces the current flowing through the infrared light emitting diode according to the magnitude of the power voltage Size to reduce the intensity of the output signal of the infrared light emitting diode. The remote control power as described in item 5 of the patent application scope The power detection circuit includes: a reference voltage generator for generating a reference voltage; and an amplifier including a first input terminal, a second input terminal, and an output terminal, wherein the first input terminal thereof The reference voltage generator is coupled to receive the reference voltage, the second input end is coupled to the battery to receive the power supply voltage, and the output end is coupled to the current control LED output driving circuit for the reference voltage The difference between the power supply voltage and the power supply voltage is amplified to output a differential amplification signal, wherein the current control LED output driving circuit determines a maximum current flowing through the infrared light emitting diode according to the difference amplification signal. The remote control circuit as recited in claim 5, wherein the power detection circuit comprises: an analog-to-digital converter comprising an input end and an output end, wherein an input end of the battery is coupled to the battery to receive the power supply a voltage, the output end of which is coupled to the current control LED output driving circuit for converting the value of the power voltage into a power digit value, wherein the current control LED output driving circuit is based on the power digit value The magnitude of the maximum current flowing through the infrared light emitting diode is determined. The remote control circuit as recited in claim 5, wherein the first end of the infrared light emitting diode is an anode, and the infrared The second end of the line LED is a cathode. A method for adjusting the intensity of an infrared signal by an operating voltage, wherein the infrared signal is emitted by a remote controller, and the remote controller has at least one battery, the method comprising: (a) detecting a power supply voltage of the battery; b) determining whether the magnitude of the power supply voltage is less than a power supply threshold; (c) when the magnitude of the power supply voltage is greater than the power supply threshold, returning to step (b); and (d) when the magnitude of the power supply voltage is less than the power supply threshold, The intensity of the infrared signal is adjusted according to the magnitude of the power supply voltage, wherein the lower the magnitude of the power supply voltage, the smaller the intensity of the infrared signal is adjusted. The method for adjusting the intensity of an infrared signal by a working voltage as recited in claim 9 wherein "the magnitude of the power supply voltage is smaller than the power threshold, and the intensity of the infrared signal is adjusted according to the magnitude of the power supply voltage" The method includes: when the magnitude of the power supply voltage is less than the power threshold, adjusting a magnitude of a current flowing through the infrared light emitting diode according to the magnitude of the power voltage, wherein the infrared light emitting diode system is configured to emit the infrared signal. A remote controller for adjusting an infrared current by a working voltage, comprising: at least one battery for supplying a power voltage; and an infrared light emitting diode comprising a first end and a second end, the first end of which is coupled to the first end a current control light emitting diode output driving circuit coupled to the second end of the infrared light emitting diode for driving the infrared light emitting diode and controlling a current flowing through the infrared light emitting diode; a button group, comprising at least one button; a microprocessor coupled to the button group and the current control LED output driving circuit for outputting a control signal to the current according to a button pressed by a user Controlling a light emitting diode output driving circuit to determine an output signal of the infrared light emitting diode; and a power detecting circuit coupled to the battery and the microprocessor for monitoring a magnitude of the power voltage and according to the power source The magnitude of the voltage, a power value is transmitted to the microprocessor, wherein when the power supply voltage is lower than a predetermined threshold, the microprocessor controls according to the power value The light-emitting diode control current output driving circuit, so that in accordance with the magnitude of the supply voltage, reducing the flow through the infrared light-emitting diode current magnitude to reduce the intensity of the output signal of an infrared light emitting diode. A remote controller for adjusting an infrared current by an operating voltage as recited in claim 11 wherein the power detecting circuit comprises: a reference voltage generator for generating a reference voltage; and an amplifier including a first input terminal, a second input terminal, and an output terminal, wherein the first input terminal is coupled to the reference voltage generator for receiving The reference voltage is coupled to the battery to receive the power voltage, and the output end is coupled to the microprocessor for amplifying the difference between the reference voltage and the power voltage to output a difference amplification And a signal, wherein the microprocessor amplifies the signal according to the difference, and controls the current to control the LED output driving circuit to determine a maximum current flowing through the infrared LED. A remote controller for adjusting an infrared current by a working voltage as recited in claim 11, wherein the power detecting circuit comprises: an analog-to-digital converter comprising an input end and an output end, wherein the input end is coupled The battery is configured to receive the power voltage, and the output end of the battery is coupled to the microprocessor for converting the value of the power voltage to a power digital value, wherein the microprocessor controls the current to control the light according to the power digital value. The diode outputs a drive circuit to determine the maximum current flowing through the infrared light emitting diode. A remote controller for adjusting an infrared current by an operating voltage as recited in claim 11, wherein the first end of the infrared light emitting diode is an anode, and the second end of the infrared light emitting diode is a cathode. A remote control circuit for controlling a remote controller, wherein the remote controller includes a battery for supplying a power voltage, an infrared light emitting diode, and a button group, wherein the infrared light emitting diode The one end of the infrared light emitting diode is coupled to the second end of the infrared light emitting diode. The remote control circuit includes a current control LED output driving circuit coupled to the second end of the infrared light emitting diode. The driving of the infrared light emitting diode and controlling the current flowing through the infrared light emitting diode; a microprocessor coupled to the button group and the current control LED output driving circuit for use according to one Pressing a button, outputting a control signal to the current control LED output driving circuit to determine an output signal of the infrared light emitting diode; and a power detecting circuit coupled to the battery and the microprocessor And monitoring the magnitude of the power voltage, and transmitting a power value to the microprocessor according to the magnitude of the power voltage, wherein when the power voltage is In a preset threshold, the microprocessor controls the current control LED output driving circuit according to the power value to reduce the current flowing through the infrared LED according to the magnitude of the power voltage. To reduce the intensity of the output signal of the infrared light emitting diode. The remote control circuit as recited in claim 15 wherein the power detection circuit comprises: a reference voltage generator for generating a reference voltage; An amplifier includes a first input terminal, a second input terminal, and an output terminal, wherein a first input terminal thereof is coupled to the reference voltage generator to receive the reference voltage, and a second input terminal is coupled to the battery Receiving the power supply voltage, the output end of the power supply is coupled to the microprocessor for amplifying the difference between the reference voltage and the power supply voltage to output a differential amplification signal, wherein the microprocessor amplifies the signal according to the difference The current control LED output driving circuit is controlled to determine the maximum current flowing through the infrared LED. The remote control circuit as claimed in claim 15 , wherein the power detection circuit comprises: an analog-to-digital converter comprising an input end and an output end, wherein an input end of the battery is coupled to the battery to receive the power supply a voltage, the output end of which is coupled to the microprocessor for converting the value of the power supply voltage into a power supply digital value, wherein the microprocessor controls the current control LED output driving circuit according to the power supply digital value To determine the maximum current flowing through the infrared light-emitting diode. The remote control circuit as recited in claim 15, wherein the first end of the infrared light emitting diode is an anode, and the second end of the infrared light emitting diode is a cathode.