CN112689356A - Switch control circuit and method and lamp - Google Patents
Switch control circuit and method and lamp Download PDFInfo
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Abstract
The embodiment of the invention provides a switch control circuit, a method and a lamp, wherein the switch control circuit comprises the following components: the voltage detection unit is connected with the micro control unit and used for detecting the voltage on the live wire corresponding to the alternating current input voltage unit and sending a driving control signal to the micro control unit according to the voltage, wherein the driving control signal sent to the micro control unit is a high-level signal under the condition that the voltage is no output voltage, and the driving control signal sent to the micro control unit is a high-low pulse signal under the condition that the voltage is an alternating current signal with fixed frequency; and the micro control unit is connected with the LED driving unit and used for sending a Pulse Width Modulation (PWM) signal to the LED driving unit according to the driving control signal so as to enable the LED driving unit to drive the LED lamp to keep a closed state under the condition that the driving control signal is a high-level signal and drive the LED lamp to keep an open state under the condition that the driving control signal is a high-low pulse signal.
Description
Technical Field
The invention relates to the field of communication, in particular to a switch control circuit and method and a lamp.
Background
With the development of science and technology, various smart homes emerge endlessly, and the quality of life of users is continuously improved along with the appearance of smart homes.
In the existing lamp in the market, a user controls the lamp to be turned on and off through a wall switch, the lamp is turned on when the lamp is turned on, and the lamp is turned off when the lamp is turned off through the wall switch; even if the user keeps turning on the lamp for a period of time after turning off the lamp through the wall switch, the LED lamp is not in the off state, but is always kept in the on state, so that the use experience of the user is influenced; in addition, if the intelligent lamp needs to be reset through operations such as repeated switching, the interval time of the repeated switching is usually short (such as 2s), and if the lamp cannot be extinguished immediately after the lamp is turned off through the wall switch, a user can easily misjudge the actual switching state of the intelligent lamp, so that the operations such as resetting cannot be completed smoothly.
Aiming at the problems that in the related art, after a user turns off the lamp, the LED lamp still keeps in a lamp-on state within a period of time after the lamp is turned off, or the user keeps turning on the lamp for a period of time after the lamp is turned off, the LED lamp always keeps in a lamp-on state, and the like, an effective technical scheme is not provided.
Disclosure of Invention
The embodiment of the invention provides a switch control circuit, a switch control method and a lamp, which are used for at least solving the problems that in the related art, after a user turns off a lamp, an LED lamp still keeps in a lamp-on state within a period of time after the user turns off the lamp, or the LED lamp keeps in a lamp-on state after the user turns off the lamp and then turns on the lamp for a period of time, and the like.
According to an embodiment of the present invention, there is provided a switch control circuit including: the voltage detection unit is connected with the micro control unit and used for detecting the voltage on the live wire corresponding to the alternating current input voltage unit and sending a driving control signal to the micro control unit according to the voltage, wherein the driving control signal sent to the micro control unit is a high-level signal under the condition that the voltage is no output voltage, and the driving control signal sent to the micro control unit is a high-low pulse signal under the condition that the voltage is an alternating current signal with fixed frequency; the micro control unit is connected with the LED driving unit and used for sending a Pulse Width Modulation (PWM) signal to the LED driving unit according to the driving control signal so as to enable the LED driving unit to drive the LED lamp to keep a closed state under the condition that the driving control signal is a high-level signal and drive the LED lamp to keep an open state under the condition that the driving control signal is a high-low pulse signal.
In one exemplary embodiment, the voltage detection unit includes: the voltage monitoring chip is connected with the switching tube and used for receiving the voltage on the live wire corresponding to the alternating current input voltage unit and sending a pulse signal to the switching tube according to the voltage; and the switching tube outputs the driving control signal according to the pulse signal.
In an exemplary embodiment, the voltage monitoring chip is configured to compare the voltage with a reset threshold of the voltage monitoring unit, and output a high-level pulse signal to the switching tube if the voltage is greater than the reset threshold, and output a low-level pulse signal to the switching tube if the voltage is less than the reset threshold.
In an exemplary embodiment, the switching tube is further configured to output a low level signal if a high level pulse signal is received, and output a high level signal if a low level pulse signal is received, where the high level and low level pulse signals include: the low level signal and the high level signal.
In an exemplary embodiment, the voltage detection unit further includes: the resistor is connected with the voltage monitoring chip and used for receiving the voltage on the live wire corresponding to the alternating-current input voltage unit; the voltage monitoring chip is used for receiving the target voltage after the voltage flows through the resistor and comparing the target voltage with the reset threshold of the voltage monitoring unit.
In an exemplary embodiment, the voltage detection unit further includes: and the capacitor is connected with the voltage monitoring chip and used for adjusting the pulse width of the pulse signal output by the voltage monitoring chip.
In an exemplary embodiment, the micro control unit is configured to send a PWM signal to the LED driving unit as a low-level PWM signal to drive the LED lamp to maintain an off state if the driving control signal is a high-level signal; and the PWM signal is a high-level PWM signal when the driving control signal is a high-low pulse signal, so as to drive the LED lamp to keep a starting state.
According to another embodiment of the present invention, there is provided a switching control method applied to any one of the above switching control circuits, including: the voltage detection unit is used for detecting the voltage on a live wire corresponding to the alternating current input voltage unit and sending a driving control signal to the micro control unit according to the voltage, wherein the driving control signal sent to the micro control unit is a high-level signal under the condition that the voltage is no output voltage, and the driving control signal sent to the micro control unit is a high-low pulse signal under the condition that the voltage is an alternating current signal with fixed frequency; and instructing the micro control unit to send a Pulse Width Modulation (PWM) signal to the LED driving unit according to the driving control signal so that the LED driving unit drives the LED lamp to keep a closed state under the condition that the driving control signal is a high-level signal, and drives the LED lamp to keep an open state under the condition that the driving control signal is a high-low pulse signal.
In one exemplary embodiment, instructing the micro control unit to transmit a Pulse Width Modulation (PWM) signal to the LED driving unit according to the driving control signal includes: under the condition that the driving control signal is a high-level signal, a PWM signal sent to the LED driving unit is a low-level PWM signal so as to drive the LED lamp to keep a closed state; and under the condition that the driving control signal is a high-low pulse signal, the PWM signal sent to the LED driving unit is a high-level PWM signal so as to drive the LED lamp to keep a starting state.
According to another embodiment of the present invention, there is provided a lamp including the switch control circuit of any one of the above.
According to the invention, the voltage detection unit is connected with the micro control unit and used for detecting the voltage on the live wire corresponding to the alternating current input voltage unit and sending the driving control signal to the micro control unit according to the voltage, wherein the driving control signal sent to the micro control unit is a high level signal under the condition that the voltage is no output voltage, and the driving control signal sent to the micro control unit is a high-low pulse signal under the condition that the voltage is an alternating current signal with fixed frequency; the micro control unit is connected with the LED driving unit and used for sending a Pulse Width Modulation (PWM) signal to the LED driving unit according to the driving control signal so as to enable the LED driving unit to drive the LED lamp to keep a closed state under the condition that the driving control signal is a high-level signal and to drive the LED lamp to keep an open state under the condition that the driving control signal is a high-low pulse signal, namely the voltage detection unit sends the driving control signal to the micro control unit by detecting the voltage on a live wire corresponding to the alternating current input voltage unit, and the micro control unit sends the PWM signal to the LED driving unit by the driving control signal so as to control the state of the LED lamp. The LED lamp always keeps in the light-on state and the like, so that the LED lamp is turned off quickly after a user turns off the lamp, and the phenomenon of keeping the lamp on for a period of time can be avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a block diagram of a switch control circuit according to an embodiment of the present invention;
fig. 2 is a hardware block diagram of a conventional switch control method according to an exemplary embodiment of the present invention;
fig. 3 is a block diagram of an internal structure of an AC/DC voltage converting unit according to an exemplary embodiment of the present invention;
FIG. 4 is a timing diagram of VDD voltage, PWM control signal, and DC bus voltage during power down according to an exemplary embodiment of the present invention;
FIG. 5 is a timing diagram of the VDD voltage, the PWM control signal, and the DC bus voltage during power down and then power up according to an exemplary embodiment of the present invention;
FIG. 6 is a timing diagram of an AC input voltage versus a DC bus voltage during a power down procedure in accordance with an exemplary embodiment of the present invention;
FIG. 7 is a timing diagram of the process of powering up after a power loss of the AC input voltage and the DC bus voltage in accordance with an exemplary embodiment of the present invention;
FIG. 8 is a hardware block diagram of a switch control method according to an embodiment of the present invention;
FIG. 9 is a block diagram of the internal structure of the voltage detection unit of the switch control method according to the embodiment of the present invention;
FIG. 10 is a timing diagram of an AC input voltage, a VDD voltage, a drive control signal, and a DC bus voltage during a power down procedure in accordance with an exemplary embodiment of the present invention;
FIG. 11 is a timing diagram of VDD voltage, drive control signal, PWM control signal, and DC bus voltage during power down according to an exemplary embodiment of the present invention;
FIG. 12 is a timing diagram of the AC input voltage, the VDD voltage, the drive control signal, and the DC bus voltage during power down and then power up according to an exemplary embodiment of the present invention;
FIG. 13 is a timing diagram of the VDD voltage, the drive control signal, the PWM control signal, and the DC bus voltage during power down and then power up according to an exemplary embodiment of the present invention;
fig. 14 is a flowchart of a switch control method according to an embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
In this embodiment, a switch control circuit is provided, which is applied to the above-mentioned lamp, and fig. 1 is a structural diagram of the switch control circuit according to an embodiment of the present invention, including:
the voltage detection unit 20 is connected with the micro control unit 22, and is configured to detect a voltage on a live wire corresponding to the ac input voltage unit and send a driving control signal to the micro control unit according to the voltage, where the driving control signal sent to the micro control unit is a high-level signal when the voltage is a no-output voltage, and the driving control signal sent to the micro control unit is a high-low pulse signal when the voltage is an ac signal with a fixed frequency;
the micro control unit 22 is connected to the LED driving unit 24, and configured to send a Pulse Width Modulation (PWM) signal to the LED driving unit according to the driving control signal, so that the LED driving unit drives the LED lamp to keep the LED lamp in an off state when the driving control signal is a high level signal, and drives the LED lamp to keep the LED lamp in an on state when the driving control signal is a high-low pulse signal.
Through the circuit, the voltage detection unit is connected with the micro control unit and used for detecting the voltage on the live wire corresponding to the alternating current input voltage unit and sending a driving control signal to the micro control unit according to the voltage, wherein the driving control signal sent to the micro control unit is a high-level signal under the condition that the voltage is no output voltage, and the driving control signal sent to the micro control unit is a high-low pulse signal under the condition that the voltage is an alternating current signal with fixed frequency; the micro control unit is connected with the LED driving unit and used for sending a Pulse Width Modulation (PWM) signal to the LED driving unit according to the driving control signal so as to enable the LED driving unit to drive the LED lamp to keep a closed state under the condition that the driving control signal is a high-level signal and to drive the LED lamp to keep an open state under the condition that the driving control signal is a high-low pulse signal, namely the voltage detection unit sends the driving control signal to the micro control unit by detecting the voltage on a live wire corresponding to the alternating current input voltage unit, and the micro control unit sends the PWM signal to the LED driving unit by the driving control signal so as to control the state of the LED lamp. The LED lamp always keeps in the light-on state and the like, so that the LED lamp is turned off quickly after a user turns off the lamp, and the phenomenon of keeping the lamp on for a period of time can be avoided.
The voltage detection unit includes: the voltage monitoring chip is connected with the switching tube and used for receiving the voltage on the live wire corresponding to the alternating current input voltage unit and sending a pulse signal to the switching tube according to the voltage; and the switching tube outputs the driving control signal according to the pulse signal.
That is to say, the voltage on the live wire corresponding to the ac input voltage unit is output to the voltage monitoring chip, the voltage monitoring chip sends a pulse signal to the switch tube according to the voltage on the live wire corresponding to the ac input voltage unit, after the switch tube receives the pulse signal, the switch tube outputs a corresponding driving control signal to the micro control unit according to the type of the pulse signal, and in short, the voltage on the live wire corresponding to the ac input voltage unit determines the driving control signal output by the switch tube to the micro control unit.
In an exemplary embodiment, a specific implementation manner of sending a pulse signal to a switching tube by a voltage monitoring chip according to a voltage on a live wire corresponding to an ac input voltage unit is as follows: the voltage monitoring chip compares the voltage with a reset threshold value of the voltage monitoring unit, outputs a high-level pulse signal to the switching tube under the condition that the voltage is greater than the reset threshold value, and outputs a low-level pulse signal to the switching tube under the condition that the voltage is less than the reset threshold value.
It should be noted that the pulse signal sent by the voltage monitoring chip to the switching tube includes: the voltage monitoring unit outputs the high-level pulse signal when the voltage on the live wire corresponding to the alternating current input voltage unit is higher than the reset threshold of the voltage monitoring unit, and the voltage monitoring unit outputs the low-level pulse signal when the voltage on the live wire corresponding to the alternating current input voltage unit is lower than the reset threshold of the voltage monitoring unit, namely when the voltage on the live wire corresponding to the alternating current input voltage unit is in other states.
After the switching tube receives the pulse signal sent by the voltage monitoring chip, in an exemplary embodiment, the switching tube outputs a low level signal if receiving a high level pulse signal, and outputs a high level signal if receiving a low level pulse signal, where the high and low pulse signals include: the low level signal and the high level signal.
That is to say, the pulse signal sent by the voltage monitoring chip to the switching tube includes: high level pulse signal and low level pulse signal, the high-low pulse signal that the switch tube sent includes: after the switching tube receives the high-level pulse signal, the source electrode and the drain electrode of the switching tube are driven to be conducted, and the drain electrode of the switching tube outputs the low-level signal to the micro control unit; when the voltage monitoring chip outputs a low-level pulse signal, the source electrode and the drain electrode of the switching tube are cut off, the drain electrode of the switching tube outputs a high-level signal to the micro control unit, and then the micro control unit outputs a corresponding PWM signal according to the high-level signal and the low-level signal output by the switching tube.
Wherein, voltage detection unit still includes: the resistor is connected with the voltage monitoring chip and used for receiving the voltage on the live wire corresponding to the alternating-current input voltage unit; the voltage monitoring chip is used for receiving the target voltage after the voltage flows through the resistor and comparing the target voltage with the reset threshold of the voltage monitoring unit.
It should be noted that, the voltage detection unit further includes a resistor, after the voltage input value resistor on the live wire corresponding to the ac input voltage unit is input, the resistor outputs a target voltage, the voltage monitoring chip determines the size of the target voltage and the reset threshold of the voltage monitoring unit, and then the voltage monitoring chip sends a pulse signal.
Further, the voltage detection unit further includes: and the capacitor is connected with the voltage monitoring chip and used for adjusting the pulse width of the pulse signal output by the voltage monitoring chip.
Specifically, the voltage monitoring chip outputs a high-level pulse signal, the capacitor adjusts the pulse width of the high-level pulse signal, and the larger the capacity of the capacitor is, the wider the pulse width of the high-level pulse signal is; the smaller the capacitance of the capacitor is, the narrower the pulse width of the high-level pulse signal is.
In an exemplary embodiment, the micro control unit sends a low-level PWM signal to the LED driving unit to drive the LED lamp to keep an off state if the driving control signal is a high-level signal; and under the condition that the driving control signal is a high-low pulse signal, the PWM signal sent to the LED driving unit is a high-level PWM signal so as to drive the LED lamp to keep a starting state.
In short, the PWM signal output by the micro control unit to the LED driving unit is controlled by the driving control signal, specifically, when the driving control signal received by the micro control unit is a high level signal, a low level PWM signal is sent to the LED driving unit, and the LED driving unit controls the LED lamp to keep a turn-off state according to the low level PWM signal; and under the condition that the driving control signal received by the micro control unit is a high-low pulse signal, a high-level PWM signal is sent to the LED driving unit, and the LED driving unit controls the LED lamp to keep a starting state according to the high-level PWM signal.
In order to better understand the above switch control circuit, the following explains the above technical solutions with reference to alternative embodiments, but the technical solutions of the embodiments of the present invention are not limited.
As shown in fig. 2, fig. 2 is a hardware block diagram of a conventional switch control method according to an exemplary embodiment of the present invention, a state of a lamp is controlled by a control system inside the lamp, a core unit of the control system is a micro control unit, an ac input voltage is rectified by a rectifying unit of a lamp power supply to output a dc bus voltage, and the dc bus voltage with a higher voltage provides a power supply voltage for an LED unit. The alternating current input voltage outputs VDD voltage through the AC/DC voltage conversion unit, the VDD voltage supplies power to the micro control unit, and the micro control unit outputs PWM control signals to control the LED DRIVE unit to DRIVE the LED unit to keep on or keep off the lamp. In the process of using a lamp by a user, after turning off the lamp through a wall switch, as shown in fig. 3, fig. 3 is a block diagram of an internal structure of an AC/DC voltage conversion unit according to an exemplary embodiment of the present invention, because an electrolytic capacitor exists at an input voltage end and an output voltage end in the AC/DC voltage conversion unit, charges stored in the electrolytic capacitor are slowly discharged within a period of time after turning off the lamp, the AC/DC voltage conversion unit continuously outputs a voltage VDD within a period of time after turning off the lamp, so that the micro control unit continuously receives a supply voltage VDD, and the micro control unit outputs an effective PWM duty control signal to control the LED DRIVE unit to DRIVE the LED unit to keep on the lamp. Fig. 4 is a timing relationship diagram of the VDD voltage, the PWM control signal and the dc bus voltage in the power down process according to an exemplary embodiment of the present invention, as shown in fig. 4, after the user turns off the light through the wall switch, the dc bus voltage continuously decreases, the VDD voltage starts to decrease after the dc bus voltage decreases by 1S, during this time period, the micro control unit continuously receives the supply voltage VDD, and the micro control unit outputs an effective PWM duty control signal to control the LED DRIVE unit to DRIVE the LED DRIVE unit to keep the light on state, that is, after the user turns off the light through the wall switch, and under the condition that the dc bus voltage received by the LED unit is less than 150V, the LED DRIVE unit keeps the light on state for 1S and then turns off the light.
A user keeps turning on the lamp for a period of time after turning off the lamp through the wall switch, and the AC/DC voltage conversion unit continuously outputs the voltage VDD for a period of time after turning off the lamp due to slow discharge of charges stored in the electrolytic capacitors at the input voltage end and the output voltage end in the AC/DC voltage conversion unit. And the micro control unit continuously receives the power supply voltage VDD within a period from the lamp turning-off to the lamp turning-on again, and then outputs an effective PWM duty ratio signal to control the LED DRIVE unit to DRIVE the LED unit to keep in a lamp-on state within a period from the lamp turning-off to the lamp turning-on again. Fig. 5 is a timing relationship diagram of the VDD voltage, the PWM control signal and the DC bus voltage during the power down and power up processes according to an exemplary embodiment of the present invention, as shown in fig. 5, the DC bus voltage is powered up again when the power down is maintained for 1s, the AC/DC voltage conversion unit always keeps an effective VDD voltage output during the power down and power up processes of the DC bus voltage, during this time period, the micro control unit continuously receives the power supply voltage VDD, and the micro control unit outputs an effective PWM duty control signal to control the LED DRIVE unit to DRIVE the LED DRIVE unit to always keep a light on state during this time period. Fig. 6 is a timing diagram of the ac input voltage and the dc bus voltage during a power down process according to an exemplary embodiment of the present invention, as shown in fig. 6, after the ac input voltage is powered down, the dc bus voltage is powered down at the same time; fig. 7 is a timing diagram of the power-down and power-up process of the ac input voltage and the dc bus voltage according to the exemplary embodiment of the present invention, and as shown in fig. 7, after the power-down and power-up of the ac input voltage, the power-down and power-up of the dc bus voltage are performed simultaneously.
The embodiment of the invention provides a switch control hardware block diagram, and further solves the problems that an LED unit can keep a light-on state in a period of time after the light is turned off and the like due to the existence of an electrolytic capacitor in an AC/DC voltage conversion unit. Fig. 8 is a hardware block diagram of a switch control method according to an embodiment of the present invention, and as shown in fig. 8, the hardware block diagram of the switch control method includes: a rectifying unit, an LED unit (equivalent to the LED lamp in the above embodiment), a voltage detecting unit, an AC/DC voltage converting unit, a micro control unit, and an LED DRIVE unit (equivalent to the LED driving unit in the above embodiment).
Specifically, the alternating-current input voltage is rectified by a rectifying unit of the lamp power supply to output direct-current bus voltage, and the direct-current bus voltage with higher voltage provides power supply voltage for the LED unit. The AC input voltage L (equivalent to the voltage on the live line corresponding to the AC input voltage unit in the above embodiment) outputs the VDD voltage through the AC/DC voltage conversion unit, the VDD voltage supplies power to the micro control unit, and the micro control unit outputs the PWM control signal to control the LED DRIVE unit to DRIVE the LED unit to keep on or off. The voltage detection unit detects an alternating current input voltage L, and when the alternating current input voltage L is an alternating current signal with fixed frequency, the voltage detection unit outputs a driving control signal with high and low pulses with the same frequency; when the ac input voltage L is not output, the voltage detection unit outputs a high-level drive control signal. After a user turns off the lamp through the wall switch, the alternating current input voltage L has no output, the micro control unit receives a high-level driving control signal, the output PWM control signal is at a low level, and the LED DRIVE unit is controlled to DRIVE the LED unit to keep a lamp-out state. After the user turns on the lamp after turning off the lamp through the wall switch for a period of time (assuming that the period of time is delta t), and the alternating current input voltage L is not output, the alternating current signal with the fixed frequency is output after delta t time. The micro control unit receives the high-level driving control signal, outputs the PWM control signal as low level, and controls the LED DRIVE unit to DRIVE the LED unit to keep the lamp-out state; after delta t time, the micro control signal receives a driving control signal of high and low pulses, and an effective PWM duty ratio control signal is output to control the LED DRIVE unit to DRIVE the LED unit to keep a lighting state.
Fig. 9 is a block diagram of an internal structure of the voltage detection unit, where the voltage detection unit is composed of a voltage monitoring chip U2, a MOS transistor Q1 (equivalent to the switching transistor in the above embodiment) and a peripheral resistor-capacitor according to the switching control method of the embodiment of the present invention. The alternating current input voltage L outputs VCC voltage after passing through a resistor R1, when the VCC voltage is higher than a U2 reset threshold value, U2 immediately outputs a high-level reset pulse signal, a capacitor C1 adjusts the pulse width of the high-level pulse signal, and the larger the capacitance of the capacitor C1 is, the wider the pulse width of the high-level pulse signal is; the smaller the capacitance of the C1 capacitor, the narrower the pulse width of the high-level pulse signal. The high-level reset pulse signal DRIVEs the source and the drain of the Q1 to be conducted, and outputs a low-level signal DR to the LED DRIVE unit; when the VCC voltage is in other states, the U2 outputs a low level T, the source and drain of the Q1 are turned off, and the high level VDD signal DR is output to the LED DRIVE unit.
When the alternating current input voltage L outputs an alternating current signal with a fixed frequency of 60HZ or 50HZ, and when the alternating current input voltage L is the fixed frequency of 60HZ, the VCC voltage generates an instantaneous voltage value higher than a U2 reset threshold value every 60HZ, it can be understood that, because the alternating current input voltage L is the fixed frequency of 60HZ, the voltage value of the VCC voltage is higher than a U2 reset threshold value every 60HZ, and then a driving control signal with high and low pulses of 60HZ is output; when the alternating current input voltage L is a fixed frequency of 50HZ, the VCC voltage generates a transient voltage value higher than the reset threshold value of U2 every 50HZ, and a driving control signal of 50HZ high-low pulse is output. When the ac input voltage L has no output, a high-level drive control signal is output.
After the user turns off the lamp through the wall switch, the alternating current input voltage L has no output, the direct current bus voltage is powered down, because of the slow discharge of the stored charges of the electrolytic capacitors at the input voltage end and the output voltage end in the AC/DC voltage conversion unit, the output voltage VDD needs to be maintained for a period of time, so that the micro-control unit continuously receives the supply voltage VDD and works normally, in the process, the driving control signal is converted into a high-level signal from the previous high-low pulse signal and is input into the micro control unit, after the micro control unit receives the driving control signal of the high-level signal, the micro control unit outputs the PWM control signal as a low level signal, controls the LED DRIVE unit to DRIVE the LED unit to maintain the light-off state, as shown in fig. 10 and 11, FIG. 10 is a timing diagram of an AC input voltage, a VDD voltage, a drive control signal, and a DC bus voltage during a power down procedure in accordance with an exemplary embodiment of the present invention; fig. 11 is a timing diagram of VDD voltage, drive control signals, PWM control signals, and dc bus voltage during power down according to an exemplary embodiment of the present invention.
A user turns on the light again after keeping the light off for a period of time (assuming that the period of time is Δ t) through the wall switch, as shown in fig. 12 and 13, fig. 12 is a timing relationship diagram of the ac input voltage, the VDD voltage, the driving control signal and the dc bus voltage in the power down and power up processes according to an exemplary embodiment of the present invention; fig. 13 is a timing diagram of VDD voltage, driving control signals, PWM control signals, and dc bus voltage during power down and power up according to an exemplary embodiment of the invention. After the AC input voltage L is not output, the AC signal with the fixed frequency is output again after the time of delta t. The direct-current bus voltage is slowly powered down and then powered up, due to the fact that the electric charges stored in the electrolytic capacitors of the input voltage end and the output voltage end in the AC/DC voltage conversion unit are slowly discharged, the output voltage VDD needs to be maintained for a period of time, and then the micro control unit continuously receives the power supply voltage VDD, in the process, a driving control signal is converted into a high-level signal from a previous high-level and low-level pulse signal, the high-level signal is converted into a high-level and low-level pulse signal again after delta t time, the driving control signal is sent to the micro control unit, the micro control unit receives a high-level driving control signal, outputs a PWM control signal to be a low level, and controls the LED DRIVE unit to DRIVE the LED unit to; after delta t time, the micro control signal receives a driving control signal of the high-low pulse signal, and outputs an effective PWM duty ratio control signal to control the LED DRIVE unit to DRIVE the LED unit to keep a lighting state.
In this embodiment, a switch control method is further provided, where the method is applied to the switch control circuit in the foregoing embodiment, and fig. 14 is a flowchart of the switch control method according to the embodiment of the present invention, and the specific steps are as follows:
step S142, detecting the voltage on the live wire corresponding to the alternating current input voltage unit through the voltage detection unit, and sending a driving control signal to the micro control unit according to the voltage, wherein the driving control signal sent to the micro control unit is a high-level signal under the condition that the voltage is no output voltage, and the driving control signal sent to the micro control unit is a high-low pulse signal under the condition that the voltage is an alternating current signal with fixed frequency;
step S144, instructing the micro control unit to send a PWM signal to the LED driving unit according to the driving control signal, so that the LED driving unit drives the LED lamp to keep the LED lamp off when the driving control signal is a high level signal, and drives the LED lamp to keep the LED lamp on when the driving control signal is a high-low pulse signal.
According to the invention, the voltage detection unit is used for detecting the voltage on the live wire corresponding to the alternating current input voltage unit, and the driving control signal is sent to the micro control unit according to the voltage, wherein the driving control signal sent to the micro control unit is a high level signal under the condition that the voltage is no output voltage, and the driving control signal sent to the micro control unit is a high-low pulse signal under the condition that the voltage is an alternating current signal with fixed frequency; the micro control unit is instructed to send a Pulse Width Modulation (PWM) signal to the LED drive unit according to the drive control signal, so that the LED drive unit drives the LED lamp to keep a closed state under the condition that the drive control signal is a high-level signal, and drives the LED lamp to keep an open state under the condition that the drive control signal is a high-low pulse signal, namely, the voltage detection unit sends the drive control signal to the micro control unit by detecting the voltage on a live wire corresponding to the alternating current input voltage unit, and the micro control unit sends the PWM signal to the LED drive unit by the drive control signal so as to control the state of the LED lamp. The LED lamp always keeps in the light-on state and the like, so that the LED lamp is turned off quickly after a user turns off the lamp, and the phenomenon of keeping the lamp on for a period of time can be avoided.
In one exemplary embodiment, instructing the micro control unit to transmit a Pulse Width Modulation (PWM) signal to the LED driving unit according to the driving control signal includes: under the condition that the driving control signal is a high-level signal, a PWM signal sent to the LED driving unit is a low-level PWM signal so as to drive the LED lamp to keep a closed state; and under the condition that the driving control signal is a high-low pulse signal, the PWM signal sent to the LED driving unit is a high-level PWM signal so as to drive the LED lamp to keep a starting state.
In short, the PWM signal output by the micro control unit to the LED driving unit is controlled by the driving control signal, specifically, when the driving control signal received by the micro control unit is a high level signal, a low level PWM signal is sent to the LED driving unit, and the LED driving unit controls the LED lamp to keep a turn-off state according to the low level PWM signal; and under the condition that the driving control signal received by the micro control unit is a high-low pulse signal, a high-level PWM signal is sent to the LED driving unit, and the LED driving unit controls the LED lamp to keep a starting state according to the high-level PWM signal.
In one exemplary embodiment, the voltage detection unit includes: the voltage monitoring chip is indicated to receive the voltage on the live wire corresponding to the alternating current input voltage unit, and a pulse signal is sent to the switching tube according to the voltage; and controlling a switching tube to output the driving control signal according to the pulse signal.
That is to say, the voltage on the live wire corresponding to the ac input voltage unit is output to the voltage monitoring chip, the voltage monitoring chip sends a pulse signal to the switch tube according to the voltage on the live wire corresponding to the ac input voltage unit, after the switch tube receives the pulse signal, the switch tube outputs a corresponding driving control signal to the micro control unit according to the type of the pulse signal, and in short, the voltage on the live wire corresponding to the ac input voltage unit determines the driving control signal output by the switch tube to the micro control unit.
In an exemplary embodiment, a specific implementation manner of the indication voltage monitoring chip sending the pulse signal to the switching tube according to the voltage on the live wire corresponding to the ac input voltage unit is as follows: and controlling a voltage monitoring chip to compare the voltage with a reset threshold value of the voltage monitoring unit, and indicating the voltage monitoring chip to output a high-level pulse signal to the switching tube under the condition that the voltage is greater than the reset threshold value, and indicating the voltage monitoring chip to output a low-level pulse signal to the switching tube under the condition that the voltage is less than the reset threshold value.
It should be noted that the pulse signal sent by the voltage monitoring chip to the switching tube includes: the voltage monitoring unit outputs the high-level pulse signal when the voltage on the live wire corresponding to the alternating current input voltage unit is higher than the reset threshold of the voltage monitoring unit, and the voltage monitoring unit outputs the low-level pulse signal when the voltage on the live wire corresponding to the alternating current input voltage unit is lower than the reset threshold of the voltage monitoring unit, namely when the voltage on the live wire corresponding to the alternating current input voltage unit is in other states.
In an exemplary embodiment, after the switching tube receives a pulse signal sent by the voltage monitoring chip, the switching tube is instructed to output a low level signal if the switching tube receives a high level pulse signal, and the switching tube is instructed to output a high level signal if the switching tube receives a low level pulse signal, wherein the high and low pulse signals include: the low level signal and the high level signal.
That is to say, the pulse signal sent by the voltage monitoring chip to the switching tube includes: high level pulse signal and low level pulse signal, the high-low pulse signal that the switch tube sent includes: after the switching tube receives the high-level pulse signal, the source electrode and the drain electrode of the switching tube are driven to be conducted, and the drain electrode of the switching tube outputs the low-level signal to the micro control unit; when the voltage monitoring chip outputs a low-level pulse signal, the source electrode and the drain electrode of the switching tube are cut off, the drain electrode of the switching tube outputs a high-level signal to the micro control unit, and then the micro control unit outputs a corresponding PWM signal according to the high-level signal and the low-level signal output by the switching tube.
In one exemplary embodiment, the resistor in the indication voltage detection unit receives the voltage on the corresponding live wire of the alternating current input voltage unit; and after the voltage monitoring chip is controlled to receive the target voltage after the voltage flows through the resistor, the target voltage is compared with the reset threshold value of the voltage monitoring unit.
It should be noted that, the voltage detection unit further includes a resistor, after the voltage input value resistor on the live wire corresponding to the ac input voltage unit is input, the resistor outputs a target voltage, the voltage monitoring chip determines the size of the target voltage and the reset threshold of the voltage monitoring unit, and then the voltage monitoring chip sends a pulse signal.
Further, the capacitor in the voltage detection unit is controlled to adjust the pulse width of the pulse signal output by the voltage monitoring chip.
Specifically, the voltage monitoring chip outputs a high-level pulse signal, the capacitor adjusts the pulse width of the high-level pulse signal, and the larger the capacity of the capacitor is, the wider the pulse width of the high-level pulse signal is; the smaller the capacitance of the capacitor is, the narrower the pulse width of the high-level pulse signal is.
In the present embodiment, a lamp is further provided, and the lamp includes the switch control circuit in the above embodiments.
An embodiment of the present invention further provides a storage medium including a stored program, wherein the program executes any one of the methods described above.
Alternatively, in the present embodiment, the storage medium may be configured to store program codes for performing the following steps:
s1, detecting a voltage on a live wire corresponding to the ac input voltage unit by the voltage detection unit, and sending a driving control signal to the micro control unit according to the voltage, where the driving control signal sent to the micro control unit is a high level signal when the voltage is a no output voltage, and the driving control signal sent to the micro control unit is a high-low pulse signal when the voltage is an ac signal with a fixed frequency;
and S2, instructing the micro control unit to send a Pulse Width Modulation (PWM) signal to the LED driving unit according to the driving control signal, so that the LED driving unit drives the LED lamp to keep in a closed state under the condition that the driving control signal is a high-level signal, and drives the LED lamp to keep in an open state under the condition that the driving control signal is a high-low pulse signal.
An embodiment of the present invention further provides a storage medium including a stored program, wherein the program executes any one of the methods described above.
Embodiments of the present invention also provide an electronic device comprising a memory having a computer program stored therein and a processor arranged to run the computer program to perform the steps of any of the above method embodiments.
Optionally, the electronic apparatus may further include a transmission device and an input/output device, wherein the transmission device is connected to the processor, and the input/output device is connected to the processor.
Optionally, in this embodiment, the processor may be configured to execute the following steps by a computer program:
s1, detecting a voltage on a live wire corresponding to the ac input voltage unit by the voltage detection unit, and sending a driving control signal to the micro control unit according to the voltage, where the driving control signal sent to the micro control unit is a high level signal when the voltage is a no output voltage, and the driving control signal sent to the micro control unit is a high-low pulse signal when the voltage is an ac signal with a fixed frequency;
and S2, instructing the micro control unit to send a Pulse Width Modulation (PWM) signal to the LED driving unit according to the driving control signal, so that the LED driving unit drives the LED lamp to keep in a closed state under the condition that the driving control signal is a high-level signal, and drives the LED lamp to keep in an open state under the condition that the driving control signal is a high-low pulse signal.
Optionally, in this embodiment, the storage medium may include, but is not limited to: various media capable of storing program codes, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A switch control circuit, comprising:
the voltage detection unit is connected with the micro control unit and used for detecting the voltage on the live wire corresponding to the alternating current input voltage unit and sending a driving control signal to the micro control unit according to the voltage, wherein the driving control signal sent to the micro control unit is a high-level signal under the condition that the voltage is no output voltage, and the driving control signal sent to the micro control unit is a high-low pulse signal under the condition that the voltage is an alternating current signal with fixed frequency;
the micro control unit is connected with the LED driving unit and used for sending a Pulse Width Modulation (PWM) signal to the LED driving unit according to the driving control signal so as to enable the LED driving unit to drive the LED lamp to keep a closed state under the condition that the driving control signal is a high-level signal and drive the LED lamp to keep an open state under the condition that the driving control signal is a high-low pulse signal.
2. The switch control circuit of claim 1, wherein the voltage detection unit comprises:
the voltage monitoring chip is connected with the switching tube and used for receiving the voltage on the live wire corresponding to the alternating current input voltage unit and sending a pulse signal to the switching tube according to the voltage;
and the switching tube outputs the driving control signal according to the pulse signal.
3. The switch control circuit according to claim 2, wherein the voltage monitoring chip is configured to compare the voltage with a reset threshold of the voltage monitoring unit, and output a high-level pulse signal to the switching tube if the voltage is greater than the reset threshold, and output a low-level pulse signal to the switching tube if the voltage is less than the reset threshold.
4. The switch control circuit of claim 3, wherein the switch tube is further configured to output a low level signal when receiving a high level pulse signal, and output a high level signal when receiving a low level pulse signal, wherein the high and low pulse signals include: the low level signal and the high level signal.
5. The switch control circuit according to claim 2, wherein the voltage detection unit further comprises:
the resistor is connected with the voltage monitoring chip and used for receiving the voltage on the live wire corresponding to the alternating-current input voltage unit;
the voltage monitoring chip is used for receiving the target voltage after the voltage flows through the resistor and comparing the target voltage with the reset threshold of the voltage monitoring unit.
6. The switch control circuit according to claim 2, wherein the voltage detection unit further comprises: and the capacitor is connected with the voltage monitoring chip and used for adjusting the pulse width of the pulse signal output by the voltage monitoring chip.
7. The switch control circuit according to claim 1, wherein the micro control unit is configured to send a low-level PWM signal to the LED driving unit to drive the LED lamp to keep an off state if the driving control signal is a high-level signal; and the PWM signal is a high-level PWM signal when the driving control signal is a high-low pulse signal, so as to drive the LED lamp to keep a starting state.
8. A switching control method applied to the switching control circuit according to any one of claims 1 to 7, comprising:
the voltage detection unit is used for detecting the voltage on a live wire corresponding to the alternating current input voltage unit and sending a driving control signal to the micro control unit according to the voltage, wherein the driving control signal sent to the micro control unit is a high-level signal under the condition that the voltage is no output voltage, and the driving control signal sent to the micro control unit is a high-low pulse signal under the condition that the voltage is an alternating current signal with fixed frequency;
and instructing the micro control unit to send a Pulse Width Modulation (PWM) signal to the LED driving unit according to the driving control signal so that the LED driving unit drives the LED lamp to keep a closed state under the condition that the driving control signal is a high-level signal, and drives the LED lamp to keep an open state under the condition that the driving control signal is a high-low pulse signal.
9. The switching control method according to claim 8, wherein instructing the micro control unit to send a Pulse Width Modulation (PWM) signal to the LED driving unit according to the driving control signal comprises:
under the condition that the driving control signal is a high-level signal, a PWM signal sent to the LED driving unit is a low-level PWM signal so as to drive the LED lamp to keep a closed state;
and under the condition that the driving control signal is a high-low pulse signal, the PWM signal sent to the LED driving unit is a high-level PWM signal so as to drive the LED lamp to keep a starting state.
10. A light fixture, comprising: the switch control circuit of any one of claims 1 to 7.
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| CN113905482A (en) * | 2021-10-13 | 2022-01-07 | 青岛易来智能科技股份有限公司 | Switch control circuit and method and lamp |
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