CN106354075B - Remote controller control circuit with backlight screen - Google Patents

Remote controller control circuit with backlight screen Download PDF

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Publication number
CN106354075B
CN106354075B CN201611067707.XA CN201611067707A CN106354075B CN 106354075 B CN106354075 B CN 106354075B CN 201611067707 A CN201611067707 A CN 201611067707A CN 106354075 B CN106354075 B CN 106354075B
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circuit
mcu
power supply
voltage
backlight
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CN106354075A (en
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黄小茂
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Beijing Hope Technology Co Ltd
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Beijing Hope Technology Co Ltd
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    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00Programme-control systems
    • G05B19/02Programme-control systems electric
    • G05B19/04Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0423Input/output
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00Program-control systems
    • G05B2219/20Pc systems
    • G05B2219/25Pc structure of the system
    • G05B2219/25257Microcontroller

Abstract

The invention discloses a remote controller control circuit with a backlight screen, which comprises a key circuit, a code sending circuit and a power supply booster circuit, wherein the power supply booster circuit boosts power supply voltage to supply power to a backlight; the backlight switch circuit is used for controlling the on and off of the backlight lamp; the MCU control circuit is used for receiving or outputting signals to control the circuit and drive the LCD, and the MCU power supply circuit; the key circuit and the code sending circuit are connected with the MCU, the input end of the booster circuit is connected with the power supply, the output end of the booster circuit is connected with the backlight lamp, the control end of the backlight switch circuit is connected with the MCU, the input end of the MCU power supply circuit is connected with the power supply, and the output end of the MCU power supply circuit is connected with the MCU; the method is characterized in that: the boosting circuit is also connected with the MCU, and the output voltage of the boosting circuit is controlled by the PWM signal output by the MCU; the invention provides a remote controller control circuit with a backlight screen, which uses a booster circuit to replace a DC/DC booster power supply chip, solves the problem of automatic reset of a remote controller and has longer service life of a battery.

Description

Remote controller control circuit with backlight screen
Technical Field
The invention relates to a remote controller, in particular to a remote controller control circuit with a backlight screen.
Background
Most of remote controllers with backlight screens on the market currently use backlight sources with driving voltages above 2.4V, such as white backlight; the control circuit of the power supply needs the DC/DC boosting power supply chip to boost the voltage to realize the function of lightening the screen when sending the code, but the DC/DC boosting power supply chip has higher cost, and has the phenomenon of automatic reset and short service life of the battery when in use, thereby influencing the competitiveness of the product market.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a remote controller control circuit with a backlight screen, which uses a boost circuit without an integrated chip to replace a DC/DC boost power supply chip, has the same boost effect, solves the problem of automatic reset of a remote controller, and has longer service life of a battery.
The purpose of the invention is realized by adopting the following technical scheme:
a remote control circuit having a backlight screen, comprising:
the key circuit is used for converting key operation into an electric signal;
the code sending circuit is used for sending infrared signals;
the power supply booster circuit boosts and outputs power supply voltage to supply power to the backlight lamp;
the sampling circuit is used for sampling the output voltage of the power supply booster circuit and outputting the output voltage to the MCU, and the MCU carries out real-time feedback regulation on the power supply booster circuit based on the feedback of the sampling circuit;
a backlight switching circuit for controlling turning on and off of the backlight;
the MCU control circuit is used for receiving or outputting signals to control the circuit and drive the LCD; and
the MCU power supply circuit is used for supplying power to the MCU;
the key circuit and the code sending circuit are connected with the MCU;
the input end of the power supply booster circuit is connected with a power supply; the control end of the power supply booster circuit is connected with the MCU and used for receiving the PWM signal output by the MCU so as to control the boosted voltage value; the output end of the power supply booster circuit is connected with one end of the backlight lamp, the input end of the sampling circuit and the MCU power supply circuit; the output end of the sampling circuit is connected with the MCU; the backlight switch circuit is connected with the other end of the backlight lamp; the control end of the backlight switch circuit is connected with the MCU and used for receiving the PWM signal output by the MCU to control the backlight switch circuit to be conducted, so that the backlight lamp is lightened while boosting is realized; the first input end of the MCU power supply circuit is connected with a power supply; the second input end of the MCU power supply circuit is connected with the output end of the power supply booster circuit and used for boosting voltage to supply power to the MCU, and the output end of the MCU power supply circuit is connected with the MCU;
the power supply boosting circuit comprises a first inductor L1, a first resistor R1, a first diode D1, a first triode Q1, a first capacitor C1 and a second capacitor C2, wherein one end of the first inductor L1 is connected with a power supply, the other end of the first inductor L1 is connected with the anode of the first diode D1 and the collector of the first triode Q1, the cathode of the first diode D1 is connected with one end of the first capacitor C1, the second capacitor C2 is connected to two ends of the first capacitor C1 in parallel, the base of the first triode Q1 is connected with the first resistor R1, the other end of the first resistor R1 is connected with the MCU, and the emitter of the first triode Q1 is connected with the other end of the first capacitor C1 and grounded;
when the key of the key circuit does not need to be operated to transmit the code, the MCU does not output the PWM signal, the backlight lamp is turned off, the power supply booster circuit does not operate, and the MCU power supply circuit supplies power to the MCU through the power supply; when the keys of the key circuit are controlled to transmit codes, the MCU outputs the PWM signals, the backlight switch circuit is conducted, the backlight lamp is lightened, the power supply booster circuit boosts the power supply voltage and outputs the boosted power supply voltage, when the voltage output by the power supply booster circuit is greater than the set voltage of the power supply voltage, the MCU power supply circuit supplies power to the MCU through the voltage output by the power supply booster circuit, and when the voltage output by the power supply booster circuit is less than the set voltage of the power supply voltage, the MCU power supply circuit supplies power to the MCU through the power supply; the sampling circuit samples the voltage output by the power supply booster circuit and outputs the voltage to the MCU, and the MCU adjusts the duty ratio of the PWM signal to further control the boosted voltage value.
Preferably, the backlight switch circuit comprises a second resistor R2, a third capacitor C3, a second diode D2 and a second transistor Q2, the anode of the second diode D2 is connected to the MCU, the cathode of the second diode D2 is serially connected to the second resistor R2 and the base of the second transistor Q2, one end of the second capacitor C2 is connected to the junction of the second diode D2 and the second resistor R2, the other end of the second capacitor C2 is connected to the emitter of the second transistor Q2 and grounded, and the collector of the second transistor Q2 is connected to one end of the backlight.
Preferably, the MCU power supply circuit includes a third diode D3, a third transistor Q3, and a third resistor R3; the anode of the third diode D3 is connected with a power supply, the MCU is connected with the cathode of the third diode D3 and the emitter of the third triode Q3, the base of the third triode Q3 is connected with the third resistor R3, the other end of the third resistor R3 is connected with the other end of the backlight lamp, and the collector of the third triode Q3 is connected with the output end of the power supply boosting circuit;
when the key does not need to be operated to transmit codes, the MCU does not output the PWM signal, the backlight lamp is in a cut-off state, the power supply booster circuit does not operate, the third triode Q3 is cut off, and at the moment, the MCU power supply circuit supplies power to the MCU through the power supply; when the key of the control key circuit transmits a code, the MCU outputs the PWM signal, the third triode Q3 is conducted, when the voltage output by the power supply booster circuit is greater than the power supply voltage by 0.3V, the MCU power supply circuit supplies power to the MCU through the voltage output by the power supply booster circuit, and when the voltage output by the power supply booster circuit is less than the power supply voltage by 0.3V, the MCU power supply circuit supplies power to the MCU through the power supply.
Preferably, the sampling circuit comprises a fifth resistor R11 and a sixth resistor R15 connected in series with the fifth resistor R11, the other end of the fifth resistor R11 is connected with the output end of the power supply boost circuit, the other end of the sixth resistor R15 is connected with the collector of the second triode Q2 in the backlight switch circuit, and the output end of the sampling circuit is connected between the fifth resistor R11 and the sixth resistor R15.
Preferably, the MCU is a chip of model number RysaRL 78/L12 series.
Compared with the prior art, the invention has the beneficial effects that: the boosting function is realized by arranging the boosting circuit to replace a power supply boosting chip; the voltage value of the boosted output voltage is more stable by arranging the sampling circuit; through setting up MCU supply circuit, switch MCU power supply for step-up voltage stabilizing circuit when sending the sign indicating number, avoid sending the sign indicating number and be battery voltage low excessively and lead to MCU to reset, also can work when battery voltage is lower like this, prolonged the battery life-span.
Drawings
Fig. 1 is a block diagram of a control circuit of a remote controller with a backlight screen according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of the boosting circuit, the backlight switch circuit, the sampling circuit, the LED backlight and the MCU power supply circuit of FIG. 1 connected with each other;
FIG. 3 is a schematic circuit diagram of the MCU control circuit, the code transmitting circuit and the LCD of FIG. 1 connected together;
FIG. 4 is a circuit schematic of the keying circuit of FIG. 1;
in the figure: 10. a key circuit; 20. a code transmitting circuit; 30. an MCU control circuit, namely an MCU; 40. an MCU power supply circuit; 50. a boost circuit; 60. a sampling circuit; 70. a backlight switching circuit; 80. an LED backlight; 90. an LCD; VCC, supply voltage; VDD, MCU working voltage; vboot, boost output voltage.
Detailed Description
The invention will be further described with reference to the accompanying drawings and the detailed description below:
referring to fig. 1, a remote controller control circuit with a backlight screen includes a key circuit 10 for converting key manipulation into an electrical signal; a code transmitting circuit 20 for transmitting an infrared signal; a power supply boosting circuit 50 for boosting the power supply voltage VCC and outputting the boosted power supply voltage VCC to the LED backlight 80 for power supply, preferably, the present invention is an LED backlight, and other backlights having the same function parameters are also applicable; a sampling circuit 60 for sampling the output voltage of the booster circuit and outputting the sampled output voltage to the MCU; a backlight switching circuit 70 for controlling turning on and off of the LED backlight 80; an MCU control circuit 30 for receiving or outputting signals to control the above circuits and drive the LCD90, and an MCU power supply circuit 40 for supplying power to the MCU; the key circuit 10 and the code sending circuit 20 are connected with the MCU; the input end of the boosting circuit 50 is connected with a power supply, the control end of the boosting circuit is connected with the MCU and used for receiving the PWM signal output by the MCU so as to control the boosting voltage value, and the output end of the boosting circuit is connected with one end of the LED backlight lamp, the sampling circuit and the MCU power supply circuit; the output end of the sampling circuit is connected with the MCU; the backlight switch circuit is connected with the other end of the LED backlight lamp, and the control end is connected with the MCU and used for receiving the PWM signal output by the MCU to control the conduction of the backlight switch circuit; the first input end of the MCU power supply circuit is connected with the power supply, the second input end of the MCU power supply circuit is connected with the output end of the boosting circuit and used for boosting voltage to supply power to the MCU, and the output end of the MCU power supply circuit is connected with the MCU.
When a user remotely controls the backlight lamp, a key in a key circuit is pressed, after the MCU obtains a corresponding operation command signal, the MCU outputs a PWM signal to the control ends of the booster circuit and the backlight switch circuit, the backlight switch circuit is switched on, the backlight lamp is grounded, the booster circuit boosts the power supply voltage and outputs the boosted voltage, the sampling circuit samples the output voltage of the booster circuit and returns a sampling value to the MCU, the MCU further controls the boosted voltage value by comparing a set voltage value range and adjusting the duty ratio of the PWM signal, so that the boosted voltage value is stabilized in a range, a stable driving voltage is provided for the backlight lamp, and the backlight lamp is lightened; the output voltage of the booster circuit also supplies power to the MCU through the MCU power supply circuit.
As shown in fig. 2, the boost circuit 50 includes a first inductor L1, a first resistor R1, a first diode D1, a first transistor Q1, a first capacitor C1 and a second capacitor C2, wherein one end of the first inductor L1 is connected to a power supply, the other end of the first inductor L1 is commonly connected to an anode of the first diode D1 and a collector of the first transistor Q1, a cathode of the first diode D1 is connected to one end of the first capacitor C1, the second capacitor C2 is connected in parallel to two ends of the first capacitor C1, a base of the first transistor Q1 is connected to the first resistor R1, the other end of the first resistor R1 is connected to the MCU, and an emitter of the first transistor Q1 is connected to the other end of the first capacitor C1 and grounded.
The MCU outputs a PWM square wave signal to a base electrode of a first triode Q1 through a first resistor R1 to control the on and off of the first triode Q1, when the first triode Q1 is conducted and grounded, a power supply VCC charges a first inductor L1, the first inductor L1 stores electric energy, when the first triode Q1 is cut off, the voltage drop of the first inductor L1 is larger than the sum of the power supply voltage VCC and the forward voltage drop of the first diode D1, the first inductor L1 charges a first capacitor C1 and a second capacitor C2 through a first diode D1, the on and off process is repeated continuously, and the basic boosting function is achieved. The boost function is realized by the design of the boost circuit and the output of the PWM signal by the MCU, thereby replacing the conventional power supply boost chip.
The backlight switch circuit 70 comprises a second resistor R2, a third capacitor C3, a second diode D2 and a second triode Q2, wherein the anode of the second diode D2 is connected with the MCU, the cathode of the second diode D2 is connected with the second resistor R2 and the base of the second triode Q2 in series, one end of the third capacitor C3 is connected with the junction of the second diode D2 and the second resistor R2, the other end of the third capacitor C3 is connected with the emitter of the second triode Q2 and grounded, and the collector of the second triode Q2 is connected with one end of the backlight 80.
The MCU outputs a PWM signal to the boost circuit 50 and also to the backlight switch circuit 70, the PWM signal passes through the second diode D2 and the second resistor R2 to the base of the second transistor Q2 to turn on the second transistor Q2, and since the emitter of the second transistor Q2 is grounded, the conduction between the collector of the second transistor Q2 and ground is achieved. The collecting electrode of the second triode Q2 is connected with one end of the LED backlight 80, the other end of the LED backlight 80 is connected with the output end of the boosting circuit, when the second triode Q2 is conducted, the collecting electrode of the second triode Q2 is grounded, the voltage at two ends of the LED backlight 80 is greater than the driving voltage of the LED backlight 80, the LED backlight 80 is lightened, when the second triode Q2 is cut off, the collecting electrode of the second triode Q2 is connected with the output end of the boosting circuit, the voltage at two ends of the LED backlight 80 is less than the driving voltage of the LED backlight 80, and the LED backlight 80 is not lightened. The backlight switch circuit 70 is designed to increase the power supply voltage and turn on the LED backlight.
The sampling circuit 60 comprises a fifth resistor R11 and a sixth resistor R15 connected in series with the fifth resistor R11, the other end of the fifth resistor R11 is connected with the output end of the boost circuit, the other end of the sixth resistor R15 is connected with the collector of the second triode Q2 in the backlight switch circuit 70, and the output end of the sampling circuit is connected between the fifth resistor R11 and the sixth resistor R15.
The sampling circuit 60 divides the output voltage Vboost of the booster circuit through a fifth resistor R11 and a sixth resistor R15, then samples the voltage value, collects the voltage value as R15 Vboost/(R11 + R15), outputs the voltage value to the MCU, compares the voltage value with a set value range, if the voltage value is larger than the set value range, the MCU reduces the duty ratio of the output PWM signal through PID operation, and if the voltage value is smaller than the set value range, the MCU increases the duty ratio of the output PWM signal through PID operation until the voltage value reaches the set voltage range. By setting the feedback of the sampling circuit 60, the boosted voltage 50 can be feedback-regulated in real time, and the boosted voltage 50 outputs a more stable power supply.
The MCU power supply circuit 40 includes a third diode D3, a third transistor Q3, and a third resistor R3; the anode of the third diode D3 is connected with the power supply, the MCU is connected with the cathode of the third diode D3 and the emitter of the third triode Q3, the base of the third triode Q3 is connected with the third resistor R3, the other end of the third resistor R3 is connected with the other end of the backlight lamp 80, and the collector of the third triode Q3 is connected with the output end of the booster circuit.
When the key does not need to be operated to send codes, the MCU does not output PWM signals, the LED backlight lamp 80 is in a cut-off state, the booster circuit does not operate, the output voltage is low, the third triode Q3 is cut off, and the MCU power supply voltage VDD is supplied by a power supply VCC through the third diode D3; when sending a code, MCU output PWM signal, third triode Q3 switches on, and when boost circuit output voltage Vboost was greater than mains voltage 0.3V, MCU operating voltage VDD was supplied power by boost circuit output voltage Vboost, and when boost circuit output voltage Vboost was less than mains voltage 0.3V, MCU operating voltage was supplied power by power VCC. Through setting up MCU supply circuit 40 for MCU supply voltage can automatic switch to higher voltage power supply mode when sending the sign indicating number, avoids the battery to reduce in the twinkling of an eye when sending the sign indicating number voltage, and voltage is less than MCU supply voltage when the twinkling of an eye and leads to the problem that MCU resets.
As shown in fig. 3 and 4, two ends of a key in the key circuit are connected with the MCU, the MCU obtains a corresponding operation command signal by operating the key, the MCU is started to output a PWM signal and output a high level driving signal to the code circuit, and the LED in the code circuit transmits an infrared control signal with a certain frequency; preferably, the MCU is a chip of model number RysaRL 78/L12 series.
In the embodiment of the invention, the beneficial effects are as follows: the boosting circuit is arranged to assist the MCU to output PWM control to realize boosting, so that a circuit using a power supply boosting chip is replaced; on the basis, a sampling circuit is arranged to feed back the MCU to adjust the PWM duty ratio to adjust the boosted voltage, so that a more stable boosted voltage range is obtained; by arranging the backlight switch circuit, the voltage is boosted and the backlight lamp is lightened; through setting up MCU supply circuit, can switch MCU power supply when sending the sign indicating number and stepping up, avoid the battery to use the overlength, MCU supply voltage is crossed the reset phenomenon that leads to excessively when sending the sign indicating number.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.

Claims (4)

1. A remote control circuit having a backlight screen, comprising:
the key circuit is used for converting key operation into an electric signal;
the code sending circuit is used for sending infrared signals;
the power supply booster circuit boosts and outputs power supply voltage to supply power to the backlight lamp;
the sampling circuit is used for sampling the output voltage of the power supply booster circuit and outputting the output voltage to the MCU, and the MCU carries out real-time feedback regulation on the power supply booster circuit based on the feedback of the sampling circuit;
a backlight switching circuit for controlling turning on and off of the backlight;
the MCU control circuit is used for receiving or outputting signals to control the circuit and drive the LCD; and
the MCU power supply circuit is used for supplying power to the MCU;
the key circuit and the code sending circuit are connected with the MCU;
the input end of the power supply booster circuit is connected with a power supply; the control end of the power supply booster circuit is connected with the MCU and used for receiving the PWM signal output by the MCU so as to control the boosted voltage value; the output end of the power supply booster circuit is connected with one end of the backlight lamp, the input end of the sampling circuit and the MCU power supply circuit; the output end of the sampling circuit is connected with the MCU; the backlight switch circuit is connected with the other end of the backlight lamp; the control end of the backlight switch circuit is connected with the MCU and used for receiving the PWM signal output by the MCU to control the backlight switch circuit to be conducted, so that the backlight lamp is lightened while boosting is realized; the first input end of the MCU power supply circuit is connected with a power supply; the second input end of the MCU power supply circuit is connected with the output end of the power supply booster circuit and used for boosting voltage to supply power to the MCU, and the output end of the MCU power supply circuit is connected with the MCU;
the power supply boosting circuit comprises a first inductor L1, a first resistor R1, a first diode D1, a first triode Q1, a first capacitor C1 and a second capacitor C2, wherein one end of the first inductor L1 is connected with a power supply, the other end of the first inductor L1 is connected with the anode of the first diode D1 and the collector of the first triode Q1, the cathode of the first diode D1 is connected with one end of the first capacitor C1, the second capacitor C2 is connected to two ends of the first capacitor C1 in parallel, the base of the first triode Q1 is connected with the first resistor R1, the other end of the first resistor R1 is connected with the MCU, and the emitter of the first triode Q1 is connected with the other end of the first capacitor C1 and grounded;
when the key of the key circuit does not need to be operated to transmit the code, the MCU does not output the PWM signal, the backlight lamp is turned off, the power supply booster circuit does not operate, and the MCU power supply circuit supplies power to the MCU through the power supply; when the keys of the key circuit are controlled to transmit codes, the MCU outputs the PWM signals, the backlight switch circuit is conducted, the backlight lamp is lightened, the power supply booster circuit boosts the power supply voltage and outputs the boosted power supply voltage, when the voltage output by the power supply booster circuit is greater than the set voltage of the power supply voltage, the MCU power supply circuit supplies power to the MCU through the voltage output by the power supply booster circuit, and when the voltage output by the power supply booster circuit is less than the set voltage of the power supply voltage, the MCU power supply circuit supplies power to the MCU through the power supply; the sampling circuit samples the voltage output by the power supply booster circuit and outputs the voltage to the MCU, and the MCU adjusts the duty ratio of the PWM signal to further control the boosted voltage value;
the MCU power supply circuit comprises a third diode D3, a third triode Q3 and a third resistor R3; the anode of the third diode D3 is connected with the power supply, the MCU is connected with the cathode of the third diode D3 and the emitter of the third triode Q3, the base of the third triode Q3 is connected with the third resistor R3, the other end of the third resistor R3 is connected with the other end of the backlight lamp, and the collector of the third triode Q3 is connected with the output end of the power supply boosting circuit.
2. The control circuit of claim 1, wherein the backlight switch circuit comprises a second resistor R2, a third capacitor C3, a second diode D2 and a second transistor Q2, wherein the anode of the second diode D2 is connected to the MCU, the cathode of the second diode D2 is serially connected to the bases of the second resistor R2 and the second transistor Q2, one end of the second capacitor C2 is connected to the junction of the second diode D2 and the second resistor R2, the other end is connected to the emitter of the second transistor Q2 and to ground, and the collector of the second transistor Q2 is connected to one end of the backlight.
3. The control circuit of claim 2, wherein the sampling circuit comprises a fifth resistor R11 and a sixth resistor R15 connected in series with the fifth resistor R11, the other end of the fifth resistor R11 is connected to the output terminal of the power boost circuit, the other end of the sixth resistor R15 is connected to the collector of the second transistor Q2 in the backlight switch circuit, and the output terminal of the sampling circuit is connected between the fifth resistor R11 and the sixth resistor R15.
4. A remote controller control circuit with a backlight screen according to any of claims 1-3, wherein the MCU is a chip of model number rasa RL78/L12 series.
CN201611067707.XA 2016-11-25 2016-11-25 Remote controller control circuit with backlight screen Active CN106354075B (en)

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