Low-power control system for a handheld device and its control method

Abstract

The present invention provides a low-power control system for a handheld device and its control method, which can intelligently control the brightness of the LED of the handheld device and reduce power consumption. It includes electrically connected: a wake-up module, the wake-up module includes a vibration switch, and the wake-up module provides a wake-up signal through the vibration switch; an LED module, the LED module includes an LED lamp; a brightness adjustment module, the brightness adjustment module includes a touch switch, and the brightness adjustment module provides a brightness adjustment signal through the touch switch; an MCU module, the wake-up module, the LED module, and the brightness adjustment module are respectively connected to the I / O ports of the MCU module. The MCU module receives the wake-up signal generated by the vibration switch closing and conducting the circuit, outputs a voltage to light up the LED lamp of the LED module. The MCU module receives the brightness adjustment signal generated by the touch switch closing, and adjusts the duty cycle of the output voltage and the brightness of the LED lamp through PWM control; a power supply module is used for power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of low-power handheld devices, and particularly relates to a low-power control system for a handheld device and a control method thereof. Background Art

[0002] In the era of intelligence and the Internet of Things, perception, computing, and control have become ubiquitous, and battery-powered electronic products have higher and higher requirements for power consumption. Low-power design is a problem that often gives product designers headaches and yet has to be faced.

[0003] The existing handheld devices can already achieve a power consumption level in the microampere range. However, for devices powered by only one button battery and required to work for tens of thousands of hours, the power consumption control of existing handheld devices still cannot fully meet the standards. Summary of the Invention

[0004] In view of the above problems, the present invention provides a low-power control system for a handheld device and a control method thereof, which can intelligently control the brightness of the LED of the handheld device and reduce power consumption.

[0005] The technical solution is as follows: A low-power control system for a handheld device includes electrically connected:

[0006] A wake-up module, the wake-up module includes a vibration switch, and the wake-up module provides a wake-up signal through the vibration switch;

[0007] An LED module, the LED module includes an LED lamp;

[0008] A brightness adjustment module, the brightness adjustment module includes a touch switch, and the brightness adjustment module provides a brightness adjustment signal through the touch switch;

[0009] An MCU module, the wake-up module, the LED module, and the brightness adjustment module are respectively connected to the I / O ports of the MCU module. The MCU module receives the wake-up signal generated by the vibration switch closing and conducting the circuit, outputs a voltage to light up the LED lamp of the LED module. The MCU module receives the brightness adjustment signal generated by the touch switch closing, and adjusts the duty cycle of the output voltage through PWM control to adjust the brightness of the LED lamp;

[0010] A power supply module, the power supply module is connected to the wake-up module, the LED module, the brightness adjustment module, and the MCU module for power supply.

[0011] Further, the wake-up module further includes a first filtering unit. The first filtering unit includes a first filtering capacitor connected in parallel with the vibration switch and a first filtering resistor connected in series with the vibration switch, and is used to filter out accidental and invalid vibrations.

[0012] Further, the brightness adjustment module further includes a second filtering unit, which includes a second filtering capacitor connected in parallel with the touch switch and a second filtering resistor connected in series with the touch switch, and is used to filter out occasional and invalid switch enabling signals.

[0013] Further, the touch switch includes a first touch switch and a second touch switch. The first touch switch is used to increase the brightness of the LED lamp, and the second touch switch is used to decrease the brightness of the LED lamp.

[0014] Further, the power supply module includes a connected battery and a boost module. The battery uses a 1.5V button battery, and the boost module includes a voltage conversion chip, which boosts the 1.5V input by the battery to 3V and then outputs it.

[0015] Further, the MCU module includes a main control chip U1. The 7th port of the main control chip U1 is connected to one end of the vibration switch K3. One end of the vibration switch K3 is connected to the power supply VCC after connecting the first filtering resistor R7. The power supply VCC is the 3V power supply output by the power supply module. The other end of the vibration switch K3 is grounded. A first filtering capacitor C3 is also connected in parallel at both ends of the vibration switch K3; the 13th port of the main control chip U1 is connected to the series-connected current-limiting resistor R1, LED lamp D1, and current-limiting resistor R2 and then grounded; the 5th and 17th ports of the main control chip U1 are connected to the power supply VCC; the 23rd port of the main control chip U1 is connected to the 3rd and 4th ports of the first touch switch K1. The 3rd and 4th ports of the first touch switch K1 are connected to the power supply VCC after connecting the resistor R3. The 1st and 2nd ports of the first touch switch K1 are grounded. A capacitor C4 is also connected in parallel with the first touch switch K1. The 24th port of the main control chip U1 is connected to the 3rd and 4th ports of the second touch switch K2. The 3rd and 4th ports of the second touch switch K2 are connected to the power supply VCC after connecting the resistor R4. The 1st and 2nd ports of the second touch switch K2 are grounded. A capacitor C5 is also connected in parallel with the second touch switch K2.

[0016] Further, the 1st port of the main control chip U1 is connected to the resistor R6 and then grounded. The 4th port of the main control chip U1 is connected to the resistor R5 and then connected to the parallel-connected capacitors C1 and C2. One end of the capacitors C1 and C2 is connected to the power supply VCC, and the other end of the capacitors C1 and C2 is grounded.

[0017] Further, the resistance values of the current-limiting resistor R1 and the current-limiting resistor R2 are adjustable.

[0018] A control method for the low-power consumption control system for a handheld device as described above, characterized by including the following steps:

[0019] Set the LED lighting time;

[0020] When the wake-up module does not send a wake-up signal, the main control module remains in the sleep state and the LED lights of the LED module are turned off. When the wake-up module sends a wake-up signal, the main control module resumes normal operation from the sleep state and the LED lights of the LED module are turned on;

[0021] When the brightness adjustment module sends brightness adjustment information, the main control module controls and adjusts the duty cycle of the output voltage through PWM to adjust the brightness of the LED lights of the LED module;

[0022] When the set LED lighting time arrives and there is no wake-up signal again, the main control module enters the sleep state and the LED lights of the LED module are turned off. The main control module records the current PWM control signal, and when waking up next time, controls the LED lights of the LED module to turn on with the recorded PWM control signal. When the LED lights light up again, they return to the brightness when they were turned off last time. If there is still a wake-up signal, keep the LED lights of the LED module on and restart the timing of the LED lighting time.

[0023] The low-power control system for a handheld device of the present invention can judge the state of the handheld device according to the vibration magnitude by setting a vibration switch, has a sleep function, and is in a sleep state when there is no wake-up signal, enabling the control system of the entire handheld device to be in a low-power sleep state for a long time. The control system can set the intelligent turning on and off of the LED lights, and control the brightness of the LED through PWM in cooperation with the control circuit, which can effectively reduce power consumption. Description of the Drawings

[0024] Figure 1 It is a block diagram of the low-power control system for a handheld device in the embodiment;

[0025] Figure 2 It is a circuit diagram of the low-power control system for a handheld device in the embodiment. Detailed Embodiment

[0026] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings. It should be noted that the diagrams provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0027] See Figure 1 , a low-power control system for a handheld device of the present invention includes electrically connected:

[0028] Wake-up module 1, the wake-up module 1 includes a vibration switch, the wake-up module 1 provides a wake-up signal through the vibration switch, and the wake-up module 1 can judge the state of the handheld device according to the vibration magnitude, and intelligently turn on and off the LED light;

[0029] LED module 2, the LED module 2 includes an LED light;

[0030] Brightness adjustment module 3, the brightness adjustment module 3 includes a touch switch, and the brightness adjustment module 3 provides a brightness adjustment signal through the touch switch;

[0031] MCU module 4, the wake-up module 1, the LED module 2, and the brightness adjustment module 3 are respectively connected to the I / O ports of the MCU module 4. The MCU module 4 receives the wake-up signal generated by the vibration switch closing and conducting the circuit, outputs a voltage to light up the LED light of the LED module, and the MCU module 4 receives the brightness adjustment signal generated by the touch switch closing, and adjusts the duty cycle of the output voltage through PWM control to adjust the brightness of the LED light;

[0032] Power supply module 5, the power supply module 5 is connected to the wake-up module 1, the LED module 2, the brightness adjustment module 3, and the MCU module 4 for power supply.

[0033] Specifically in this embodiment, the wake-up module 1 further includes a first filtering unit. The first filtering unit includes a first filtering capacitor connected in parallel with the vibration switch and a first filtering resistor connected in series with the vibration switch, which is used to filter out accidental and invalid vibrations, avoid invalid wake-up of the control system, and save power consumption.

[0034] Specifically in this embodiment, the brightness adjustment module 3 further includes a second filtering unit. The second filtering unit includes a second filtering capacitor connected in parallel with the touch switch and a second filtering resistor connected in series with the touch switch, which is used to filter out accidental and invalid switch enable signals and avoid unplanned brightness switching of the control system.

[0035] At the same time, the touch switch includes a first touch switch K1 and a second touch switch K2. The first touch switch K1 is used to increase the brightness of the LED light, and the second touch switch K2 is used to decrease the brightness of the LED light. Such a setting can facilitate operation and use.

[0036] Specifically in this embodiment, the power supply module includes a connected battery and a boost module. The battery uses a 1.5V button battery. The boost module includes a voltage conversion chip. The voltage conversion chip boosts the 1.5V input by the battery to 3V and then outputs. The voltage conversion chip can use PW5100, which requires fewer peripheral components, supports small external inductors and output capacitors, and can maintain an ultra-low static current at the same time, achieving good efficiency and helping to reduce power consumption.

[0037] In an embodiment of the present invention, the MCU module 4 includes a main control chip U1. The chip model adopted by the MCU module is STM32L051. The wake-up module 1 includes a vibration switch K3, a filter capacitor C3, and a filter resistor R7. The 7th port of the main control chip U1 is connected to one end of the vibration switch K3 of the wake-up module 1. One end of the vibration switch K3 is connected to the power supply VCC after connecting the first filter resistor R7. The power supply VCC is the 3V power supply output by the power supply module. The other end of the vibration switch K3 is grounded. A first filter capacitor C3 is also connected in parallel at both ends of the vibration switch K3. The model of the vibration switch K3 is BL-18010P. The vibration switch K3 adopts a ball-type vibration switch. Under the action of gravity, the conductive beads roll to contact both ends of the circuit, thereby realizing the on and off of the circuit. The filter circuit composed of the filter capacitor C3, the filter resistor R7, and the digital filter of the MCU module filters out accidental and invalid vibrations, avoids ineffective wake-up of the control system, and saves power consumption.

[0038] The brightness adjustment module 3 includes tactile switches K1, K2, resistors R3, capacitors C4 of the filter unit, and resistors R4, capacitors C5. The models of the tactile switches K1, K2 are KH-404015-AJ. The 23rd port of the main control chip U1 is connected to the 3rd and 4th ports of the first tactile switch K1. The 3rd and 4th ports of the first tactile switch K1 are connected to the power supply VCC after connecting the resistor R3. The 1st and 2nd ports of the first tactile switch K1 are grounded. A capacitor C4 is also connected in parallel to the first tactile switch K1. The 24th port of the main control chip U1 is connected to the 3rd and 4th ports of the second tactile switch K2. The 3rd and 4th ports of the second tactile switch K2 are connected to the power supply VCC after connecting the resistor R4. The 1st and 2nd ports of the second tactile switch K2 are grounded. A capacitor C5 is also connected in parallel to the second tactile switch K2. The resistors R3, capacitors C4 and resistors R4, capacitors C5 of the filter unit filter out accidental and invalid switch enable signals at the analog end. The digital filter circuit of the MCU module filters out accidental and invalid switch enable signals at the digital end, avoiding unplanned brightness switching of the control system.

[0039] The LED module 2 includes an LED lamp D1, current-limiting resistors R1, R2. The 13th port of the main control chip U1 is connected to the series-connected current-limiting resistor R1, LED lamp D1, and current-limiting resistor R2 and then grounded; the 5th and 17th ports of the main control chip U1 are connected to the power supply VCC. The 1st port of the main control chip U1 is connected to the resistor R6 and then grounded. The 4th port of the main control chip U1 is connected to the resistor R5 and then connected to the parallel-connected capacitors C1, C2. One end of the capacitors C1, C2 is connected to the power supply VCC, and the other end of the capacitors C1, C2 is grounded; the main control module controls the brightness of the LED lamp by adjusting the duty cycle of the PWM. In addition, the minimum brightness of the LED lamp can be set according to the minimum duty cycle of the PWM by setting the current-limiting resistor R1 and the current-limiting resistor R2. Specifically as follows:

[0040] Set the minimum brightness of the LED lamp, convert it to the power consumption current A0, the high voltage of the PWM is U0, the minimum duty cycle is P0, and the resistance values of the current-limiting resistors R1 and R2 are calculated according to the formula: R1 + R2 = U0 * P0 / A0;

[0041] Set the resistance values of the current-limiting resistor R1 and the current-limiting resistor R2 to be adjustable, so that the maximum brightness and the minimum brightness of the LED lamp can be adjusted.

[0042] In an embodiment of the present invention, there is also provided a control method for the low-power control system for a handheld device in the above embodiment, including the following steps:

[0043] Set the LED lighting time;

[0044] When the wake-up module does not send a wake-up signal, the main control module remains in the sleep state, and the LED lamp of the LED module is turned off. When the wake-up module sends a wake-up signal, the main control module resumes normal operation from the sleep state, and the LED lamp of the LED module is turned on;

[0045] When the brightness adjustment module sends brightness adjustment information, the main control module adjusts the duty cycle of the output voltage through PWM control to adjust the brightness of the LED lamp of the LED module;

[0046] When the set LED lighting time arrives and there is no wake-up signal again, the main control module enters the sleep state, and the LED lamp of the LED module is turned off. The main control module records the current PWM control signal, and when waking up next time, controls the LED lamp of the LED module to turn on with the recorded PWM control signal. When the LED lamp lights up again, it resumes the brightness when it was turned off last time. If there is still a wake-up signal, keep the LED lamp of the LED module on and restart the timing of the LED lighting time.

[0047] The low-power control system for a handheld device of the present invention controls the brightness of the LED through PWM in cooperation with the control circuit, has a sleep function, enables the entire low-power intelligent control module to be in a low-power sleep state for a long time, and has a memory function, which can remember the brightness when the LED lamp was turned off last time, so that when the LED lamp lights up again, it resumes the brightness when it was turned off last time.

[0048] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes within the meaning and scope of the equivalent elements of the claims in the present invention.

[0049] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A low-power control system for a handheld device, characterized in that, Including electrically controlled connections: A wake-up module, the wake-up module includes a vibration switch, and the wake-up module provides a wake-up signal through the vibration switch; An LED module, the LED module includes an LED lamp; A brightness adjustment module, the brightness adjustment module includes a touch switch, and the brightness adjustment module provides a brightness adjustment signal through the touch switch; An MCU module, the wake-up module, the LED module, and the brightness adjustment module are respectively connected to the I / O ports of the MCU module. The MCU module receives the wake-up signal generated by the vibration switch closing and conducting the circuit, outputs a voltage to light up the LED lamp of the LED module. The MCU module receives the brightness adjustment signal generated by the touch switch closing, and adjusts the duty cycle of the output voltage through PWM control to adjust the brightness of the LED lamp; A power supply module, the power supply module is connected to the wake-up module, the LED module, the brightness adjustment module, and the MCU module for power supply; The MCU module includes a main control chip U1. The 7th port of the main control chip U1 is connected to one end of the vibration switch K3. One end of the vibration switch K3 is connected to the power supply VCC after connecting the first filter resistor R7. The power supply VCC is the 3V power supply output by the power supply module. The other end of the vibration switch K3 is grounded. A first filter capacitor C3 is also connected in parallel across the two ends of the vibration switch K3; The 13th port of the main control chip U1 is connected to the series-connected current-limiting resistor R1, LED lamp D1, and current-limiting resistor R2 and then grounded; The 5th and 17th ports of the main control chip U1 are connected to the power supply VCC; The 23rd port of the main control chip U1 is connected to the 3rd and 4th ports of the first touch switch K1. The 3rd and 4th ports of the first touch switch K1 are connected to the power supply VCC after connecting the resistor R3. The 1st and 2nd ports of the first touch switch K1 are grounded. A capacitor C4 is also connected in parallel with the first touch switch K1. The 24th port of the main control chip U1 is connected to the 3rd and 4th ports of the second touch switch K2. The 3rd and 4th ports of the second touch switch K2 are connected to the power supply VCC after connecting the resistor R4. The 1st and 2nd ports of the second touch switch K2 are grounded. A capacitor C5 is also connected in parallel with the second touch switch K2.

2. The low-power control system for a handheld device according to claim 1, characterized in that: The wake-up module further includes a first filtering unit. The first filtering unit includes a first filter capacitor connected in parallel with the vibration switch and a first filter resistor connected in series with the vibration switch, and is used to filter out accidental and invalid vibrations.

3. A low-power control system for a handheld device according to claim 1, characterized in that: The brightness adjustment module further includes a second filtering unit. The second filtering unit includes a second filter capacitor connected in parallel with the touch switch and a second filter resistor connected in series with the touch switch, and is used to filter out accidental and invalid switch enable signals.

4. A low-power control system for a handheld device according to claim 1, wherein: The touch switch includes a first touch switch and a second touch switch. The first touch switch is used to increase the brightness of the LED lamp, and the second touch switch is used to decrease the brightness of the LED lamp.

5. A low-power control system for a handheld device according to claim 1, wherein: The power supply module includes a connected battery and a boost module. The battery uses a 1.5V button battery. The boost module includes a voltage conversion chip, and the voltage conversion chip boosts the 1.5V input by the battery to 3V and then outputs it.

6. The low-power consumption control system for a handheld device according to claim 5, wherein: The 1 port of the main control chip U1 is connected to the resistor R6 and then grounded. The 4 port of the main control chip U1 is connected to the resistor R5 and then connected to the parallel capacitors C1 and C2. One end of the capacitors C1 and C2 is connected to the power supply VCC, and the other end of the capacitors C1 and C2 is grounded.

7. A low-power control system for a handheld device according to claim 1, characterized in that: The resistance values of the current-limiting resistors R1 and R2 are adjustable.

8. A control method for a low-power control system for a handheld device according to claim 1, characterized in that, It includes the following steps: Set the LED lighting time; When the wake-up module does not send a wake-up signal, the main control module remains in the sleep state, and the LED of the LED module is turned off. When the wake-up module sends a wake-up signal, the main control module resumes normal operation from the sleep state, and the LED of the LED module is turned on; When the brightness adjustment module sends brightness adjustment information, the main control module adjusts the duty cycle of the output voltage through PWM control to adjust the brightness of the LED of the LED module; When the set LED lighting time arrives and there is no wake-up signal again, the main control module enters the sleep state, and the LED of the LED module is turned off. The main control module records the current PWM control signal. When waking up next time, the LED of the LED module is turned on with the recorded PWM control signal. When the LED lights up again, it returns to the brightness when it was turned off last time. If there is still a wake-up signal, keep the LED of the LED module on and restart the timing of the LED lighting time.

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