CN115734416B - LED wide voltage self-adaptive control method, control circuit and display device - Google Patents
LED wide voltage self-adaptive control method, control circuit and display device Download PDFInfo
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Abstract
The invention discloses an LED wide voltage self-adaptive control method, a control circuit and a display device, which comprise the steps of acquiring a time sequence period t for controlling an LED luminous component, and uniformly dividing the time sequence period t into three time periods t1, t2 and t3; acquiring pulse signals, wherein the first pulse signals control the first color lamp bead D1 to be turned on and off, the second pulse signals control the second color lamp bead D2 to be turned on and off, and the third pulse signals control the third color lamp bead D3 to be turned on and off; according to the power supply voltage value, the first pulse signal, the second pulse signal and the third pulse signal are configured to be turned on in the time periods of t1, t2 and t3, and the LED light-emitting component can adapt to lower power supply voltage, so that the voltage width of the multi-LED light-emitting component, which can normally work, is greatly increased. And then, the problems of brightness attenuation and color distortion of the LED light-emitting component caused by voltage attenuation caused by increasing the load of the circuit due to the increase of the LED light-emitting component are effectively solved.
Description
Technical Field
The invention relates to the technical field of LED control, in particular to an LED wide voltage self-adaptive control method, a control circuit and a display device.
Background
The LED display device is composed of a plurality of groups of LED light emitting components, and the LED light emitting components in the prior art are mostly color-doped in RGB color mode, that is, various colors are obtained by changing three color beads of red (R), green (G) and blue (B) and overlapping them with each other.
Typically, these LED lighting assemblies are connected together in parallel. However, as the number of LED light emitting components increases or the layout area increases, the load of the circuit increases, thereby causing voltage decay, which ultimately reacts to the brightness and color of the LED light emitting components. For example, the LED luminous component close to the voltage source has high brightness and good color expression, and the LED luminous component far away from the voltage source has low brightness and distorted color expression.
The conventional method for solving the technical problems is to increase the power supply voltage so as to ensure that the voltage value of the furthest LED light-emitting component is in a normal working range, and in the scheme, the power supply voltage can only be set to be a relatively high value, so that the LED light-emitting component at a distance still has enough voltage after the power supply voltage is attenuated so as to ensure the normal working of the LED light-emitting component.
Disclosure of Invention
Aiming at the defects in the prior art, the invention discloses three technical schemes, and effectively solves the problem of insufficient voltage of the LED luminous component far from a voltage end caused by voltage division generated by wire extension. The first technical scheme is an LED wide voltage self-adaptive control method, and the technical scheme can automatically adjust the combination modes of lighting of R color lamp beads, G color lamp beads and B color lamp beads according to the size of the power supply voltage, so that the LED wide voltage power supply of the LED luminous assembly can be realized under the condition of ensuring the normal work of the LED luminous assembly.
The second technical scheme is a control circuit based on the first technical scheme; a third technical means is the display device of the second technical means.
The first technical scheme of the invention is as follows:
an LED wide voltage adaptive control method comprises the following steps:
and acquiring and controlling a time sequence period t of the LED luminous component.
The timing period t is uniformly divided into three periods t1, t2 and t3, t1=t2=t3=1/3×t.
The method comprises the steps of obtaining pulse signals, wherein the pulse signals comprise a first pulse signal, a second pulse signal and a third pulse signal, the first pulse signal controls the first color lamp bead D1 to be turned on and off, the second pulse signal controls the second color lamp bead D2 to be turned on and off, and the third pulse signal controls the third color lamp bead D3 to be turned on and off.
And obtaining a power supply voltage value.
And configuring the first pulse signal, the second pulse signal and the third pulse signal to be started in the t1, t2 and t3 time periods according to the power supply voltage value.
In a further technical scheme, the control method further comprises configuring a constant current value.
Further, the specific configuration method for configuring the first pulse signal, the second pulse signal and the third pulse signal to be turned on in the period of t1, t2 and t3 is as follows:
when the power supply voltage value is smaller than 6V, one time interval is selected from the first pulse signal, the second pulse signal and the third pulse signal in the time intervals of t1, t2 and t3 respectively as an openable time interval, and the openable time intervals selected from the first pulse signal, the second pulse signal and the third pulse signal are not overlapped.
At this time, the widths of the first pulse signal, the second pulse signal and the third pulse signal are selected from 0-1/3*t, and the constant current value is 3*I o 。
Further, the specific configuration method for configuring the first pulse signal, the second pulse signal and the third pulse signal to be turned on in the period of t1, t2 and t3 is as follows:
when the power supply voltage value is more than 9V and is more than or equal to 6V, the first pulse signal, the second pulse signal and the third pulse signal are respectively selected from two time periods within the time periods of t1, t2 and t3 to serve as openable time periods, and only one openable time period is overlapped between the two openable time periods selected from the first pulse signal, the second pulse signal and the third pulse signal.
At this time, the widths of the first pulse signal, the second pulse signal and the third pulse signal are selected from 0-1/3*t, and the constant current value is configured to be 1.5 xI o 。
Further, the specific configuration method for configuring the first pulse signal, the second pulse signal and the third pulse signal to be turned on in the period of t1, t2 and t3 is as follows:
when the power supply voltage value is more than or equal to 9V, the first pulse signal, the second pulse signal and the third pulse signal can be started in the time periods of t1, t2 and t3 at the same time.
At this time, the widths of the first pulse signal, the second pulse signal and the third pulse signal are selected within 0-t, and the constant current value is configured as I o 。
The second technical scheme of the invention is a control circuit based on the first technical scheme, and the control circuit comprises an LED light-emitting component, a constant-current driving unit and a switch unit.
The LED light-emitting component comprises a first color lamp bead D1, a second color lamp bead D2 and a third color lamp bead D3.
The positive electrode of the first color lamp bead D1 is connected with the power supply voltage, the negative electrode of the first color lamp bead D1 is connected with the positive electrode of the second color lamp bead D2, the negative electrode of the second color lamp bead D2 is connected with the positive electrode of the third color lamp bead D3, and the negative electrode of the third color lamp bead D3 is connected with the constant current driving unit.
The switch unit is used for switching on and off the first color lamp bead D1, the second color lamp bead D2 and the third color lamp bead D3.
In a more preferable technical scheme, the switch unit is an MOS tube, and the MOS tube comprises a first MOS tube Q1, a second MOS tube Q2 and a third MOS tube Q3;
the first MOS tube Q1, the second MOS tube Q2 and the third MOS tube Q3 are connected in series;
the first MOS tube Q1 is connected with the first color lamp bead D1 in parallel and is used for controlling the on and off of the first color lamp bead D1.
The second MOS tube Q2 is connected with the second color lamp bead D2 in parallel and is used for controlling the on and off of the second color lamp bead D2.
The third MOS tube Q3 is connected with the third color lamp bead D3 in parallel and is used for controlling the on and off of the third color lamp bead D3.
And the grid electrodes of the first MOS tube Q1, the second MOS tube Q2 and the third MOS tube Q3 are connected with PWM signal ends of the logic control unit.
The constant current driving unit is connected with the control end of the logic control unit.
Further, the first color lamp bead D1, the second color lamp bead D2 and the third color lamp bead D3 are respectively any one of the following six combinations in sequence:
r-color lamp beads, G-color lamp beads and B-color lamp beads;
or G-color lamp beads, R-color lamp beads and B-color lamp beads;
or B color lamp beads, G color lamp beads and R color lamp beads;
or R-color lamp beads, B-color lamp beads and G-color lamp beads;
or G-color lamp beads, B-color lamp beads and R-color lamp beads;
or B-color lamp beads, R-color lamp beads and G-color lamp beads.
A third aspect of the present invention is the display device according to the second aspect.
According to the LED wide-voltage self-adaptive control method, the control circuit and the display device, the combination mode of lighting of the R color lamp bead, the G color lamp bead and the B color lamp bead can be automatically adjusted according to the size of the power supply voltage, so that the LED luminous component is adapted to lower power supply voltage without affecting normal operation, and the voltage width of the multi-LED luminous component capable of operating normally is greatly increased. And then, the problems of brightness attenuation and color distortion of the LED light-emitting component caused by voltage attenuation caused by increasing the load of the circuit due to the increase of the LED light-emitting component are effectively solved.
Drawings
Fig. 1 is a schematic flow chart of a method for adaptively controlling LED wide voltage according to the present invention.
Fig. 2 is a schematic flowchart showing a specific step of step S105 in the LED wide voltage adaptive control method according to the present invention.
Fig. 3 is a schematic diagram of the timing sequences of the first pulse signal, the second pulse signal and the third pulse signal when the power supply voltage is less than 6V in the LED wide voltage adaptive control method of the present invention.
FIG. 4 is a schematic diagram showing the timing sequences of the first pulse signal, the second pulse signal and the third pulse signal when the power supply voltage value is greater than or equal to 9V and equal to 6V in the LED wide voltage adaptive control method of the present invention.
FIG. 5 is a schematic diagram showing the timing sequences of the first pulse signal, the second pulse signal and the third pulse signal when the power supply voltage value is equal to or greater than 9V in the LED wide voltage adaptive control method of the present invention.
Fig. 6 is a schematic diagram of an on-current flow of a first color lamp D1 when a supply voltage is less than 6V in a control circuit based on an LED wide voltage adaptive control method according to the present invention.
FIG. 7 is a schematic diagram of the second color bead D2 on-state current flow when the power supply voltage is less than 6V in the control circuit based on the LED wide-voltage adaptive control method.
FIG. 8 is a schematic diagram of the third color bead D3 on-current flow when the power supply voltage is less than 6V in the control circuit based on the LED wide voltage adaptive control method.
FIG. 9 is a schematic diagram of the flow of the starting currents of the first color lamp bead D1 and the second color lamp bead D2 when the power supply voltage value of 9V > is equal to or greater than 6V in the control circuit based on the LED wide voltage self-adaptive control method.
FIG. 10 is a schematic diagram of the on-state current flow of the second color lamp D2 and the third color lamp D3 when the 9V > supply voltage value is equal to or greater than 6V in the control circuit based on the LED wide voltage adaptive control method.
FIG. 11 is a schematic diagram of the on-state current flow of the first color lamp D1 and the third color lamp D3 when the 9V > supply voltage value is equal to or greater than 6V in the control circuit based on the LED wide voltage adaptive control method.
FIG. 12 is a schematic diagram of the starting current flow of the first color bead D1, the second color bead D2 and the third color bead D3 when the power supply voltage value in the control circuit based on the LED wide voltage self-adaptive control method is equal to or more than 9V.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
For the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; some well known structures in the drawings and omission of the description thereof will be understood by those skilled in the art. The same or similar reference numerals correspond to the same or similar components.
The LED light emitting components in the prior art are often connected in parallel to form a large area or a long line, but as the area of the LED light emitting component is increased or the length of the LED light emitting component is increased, the load of the line is increased, so that voltage attenuation is caused, and finally, the voltage attenuation and the color distortion of the LED light emitting component are reflected.
The LED luminous component comprises three-color beads, namely an R-color bead (red bead), a G-color bead (green bead) and a B-color bead (blue bead). The working voltage of the R-color lamp beads is 2V, the working voltage of the G-color lamp beads is 3V, the working voltage of the B-color lamp beads is 3V, and the connection modes of the R-color lamp beads, the G-color lamp beads and the B-color lamp beads are usually connected in series. Therefore, under the conventional condition, the LED light-emitting component can work normally only when the power supply voltage of more than 8V is applied, and the power supply deficiency lamp beads are arranged in the R-color lamp beads, the G-color lamp beads and the B-color lamp beads and show brightness attenuation, and are particularly shown on brightness attenuation and color distortion of the whole LED light-emitting component.
The method commonly used in the prior art for solving the technical problems is to increase the power supply voltage so as to ensure that the attenuated voltage value of the farthest LED light-emitting component is still in the normal working range, but the power supply voltage can only be set in a relatively narrow range and cannot be lower than the voltage threshold of 8V.
The invention discloses an LED wide voltage self-adaptive control method, a control circuit and a display device.
The screen-brushing frequency of the LED luminous component is in the kilohertz level, the common screen-brushing frequency is 4K Hz, the period is 0.25ms, the minimum screen-brushing frequency which can be identified by naked eyes of a person is 25 Hz, the period is 40 ms, that is, when the screen-brushing period of the luminous device is less than 40 ms, the screen-brushing period of the LED luminous component is far lower than the distinguishable period of the naked eyes of the person.
The operating principle of the technical scheme is that the R color lamp bead, the G color lamp bead and the B color lamp bead are lightened at different time points, and at least one lamp bead can be lightened at one time point, so that the lightened lamp bead can still normally work when the power supply voltage is attenuated to 3.5V, the screen brushing frequency of the lamp bead is far higher than the resolution frequency of naked eyes of people, so that the R color lamp bead, the G color lamp bead and the B color lamp bead can be lightened for a plurality of cycles in the time of being resolved by naked eyes of people, and the visual effect of the R color lamp bead, the G color lamp bead and the B color lamp bead are lightened at the same time point at the same time without any difference.
The specific embodiment of the technical scheme is as follows:
example 1
The embodiment is shown in fig. 1, which is a method for adaptively controlling the wide voltage of an LED, and the method comprises the following steps:
step S101 obtains a timing period t for controlling the LED lighting assembly.
It should be noted that the LED light emitting assembly in step S101 includes a first color bead D1, a second color bead D2 and a third color bead D3. The first color lamp bead D1, the second color lamp bead D2 and the third color lamp bead D3 are R color lamp beads, G color lamp beads and B color lamp beads. Specifically, the first color lamp bead D1, the second color lamp bead D2 and the third color lamp bead D3 are any one of the following six combinations in sequence respectively:
r-color lamp beads, G-color lamp beads and B-color lamp beads;
or G-color lamp beads, R-color lamp beads and B-color lamp beads;
or B color lamp beads, G color lamp beads and R color lamp beads;
or R-color lamp beads, B-color lamp beads and G-color lamp beads;
or G-color lamp beads, B-color lamp beads and R-color lamp beads;
or B-color lamp beads, R-color lamp beads and G-color lamp beads.
Step S102 uniformly divides the timing period t into three periods t1, t2 and t3, t1=t2=t3=1/3×t.
Step S103 is to acquire pulse signals, wherein the pulse signals comprise a first pulse signal, a second pulse signal and a third pulse signal, the first pulse signal controls the on and off of the first color lamp bead D1, the second pulse signal controls the on and off of the second color lamp bead D2, and the third pulse signal controls the on and off of the third color lamp bead D3. It should be noted that, in this embodiment, the frequencies of the first pulse signal, the second pulse signal and the third pulse signal are the same.
The step S103 needs to be described that the first pulse signal, the second pulse signal and the third pulse signal can control the on/off of the first color light bead D1, the second color light bead D2 and the third color light bead D3, and can control the on/off time of the first color light bead D1, the second color light bead D2 and the third color light bead D3 by adjusting the pulse width. Taking the first pulse signal to control the on/off of the first color bead D1 as an example, when the pulse width of the first pulse signal is modulated, the on time of the first color bead D1 is correspondingly longer.
Step S104 acquires a supply voltage value.
In this embodiment, the step S104 is to obtain the power supply voltage value as the power supply voltage value of the LED lighting assembly. Taking a plurality of parallel LED light emitting components as long line shape as an example, step S104 obtains a power supply voltage value as a voltage value of each parallel LED light emitting component.
The specific power supply voltage value acquisition in step S104 may be an automatic power supply voltage value acquisition, or may be a voltage interval value calculation in different length intervals according to the lengths of the plurality of parallel LED light emitting components, and then the voltage interval value is set. In addition to the above two methods, the present embodiment may be other methods for obtaining the power supply voltage value, which are common in the prior art, and this embodiment is not repeated here.
Step S105 configures the first pulse signal, the second pulse signal and the third pulse signal to be turned on in the periods t1, t2 and t3 according to the supply voltage value.
In a more preferable technical solution of this embodiment, the control method further includes configuring a constant current value. The magnitude of the constant current value is proportional to the brightness of the LED light emitting component, and besides, the brightness of the LED light emitting component is proportional to the pulse width of the pulse signal. That is, the larger the constant current value is, the wider the pulse width of the pulse signal is, and the higher the brightness of the LED light emitting component is.
In step S105, the first pulse signal, the second pulse signal and the third pulse signal are configured to be turned on in the time periods t1, t2 and t3, and the overall idea of the step is to narrow pulse widths of the first pulse signal, the second pulse signal and the third pulse signal, and then to be turned on in the time periods t1, t2 and t 3. However, in this embodiment, the pulse widths of the first pulse signal, the second pulse signal and the third pulse signal are not changed regardless of the adjustment, so that the corresponding constant current value is increased after the pulse widths of the first pulse signal, the second pulse signal and the third pulse signal are narrowed.
In this embodiment, it should be specifically noted that the steps S101, S102, S103, S104 and S105 are not strictly performed in order, and the order of the steps may be adjusted without affecting the result of the present technical solution, which is not repeated in this embodiment.
In this embodiment, as shown in fig. 2, step S105 configures the first pulse signal, the second pulse signal and the third pulse signal to be turned on in the period of t1, t2 and t3 according to the supply voltage value, and the specific configuration method is divided into three cases:
in the first case (S501 in fig. 2), when the supply voltage value is less than 6V, one period is selected from the first pulse signal, the second pulse signal and the third pulse signal in the periods t1, t2 and t3 as the openable period, and the openable periods selected from the first pulse signal, the second pulse signal and the third pulse signal do not overlap, as shown in fig. 3.
In this embodiment, the first pulse signal, the second pulse signal and the third pulse signal have widths (i.e., pulse widths) selected from 0-1/3*t, and it should be noted that, in order to ensure that the total brightness of the LED light emitting assembly is unchanged, the constant current value is 3*I o Wherein I o The standard constant current value is set when the first pulse signal, the second pulse signal and the third pulse signal are simultaneously started in the pulse period t and the pulse signal width is 0-t.
In the second case (S502 in fig. 2), that is, when the power supply voltage value is greater than or equal to 9V and equal to 6V, the first pulse signal, the second pulse signal and the third pulse signal are respectively selected from two time periods within the time periods t1, t2 and t3 as the openable time periods, and only one of the openable time periods selected from the first pulse signal, the second pulse signal and the third pulse signal is overlapped with each other, as shown in fig. 4.
Such as: the first pulse signal is started in the time periods t1 and t2 simultaneously, the second pulse signal is started in the time periods t2 and t3, and the third pulse signal is started in the time periods t1 and t 3.
In this embodiment, the first pulse signal, the second pulse signal and the third pulse signal are selected from 0-1/3*t, and the constant current value is configured to be 1.5×i o 。
In the third case (S503 in fig. 2), when the power supply voltage is greater than or equal to 9V, the first pulse signal, the second pulse signal and the third pulse signal can be turned on in the time periods t1, t2 and t3 at the same time.
In this embodiment, the first pulse signal, the second pulse signal and the third pulse signal are selected from the widths of 0-t, and the constant current value is configured as I o 。
It should be noted that in the first, second and third cases, since the screen brushing period of the LED light emitting device is far lower than the distinguishable period of the human eyes, the human visual effect is equivalent to that of the first pulse signal, the second pulse signal and the third pulse signal being turned on simultaneously in the time periods t1, t2 and t3, and the whole technical scheme is based on the principle.
In the technical scheme, the first condition, the second condition and the third condition can occur independently, can also occur two by two or can also occur three simultaneously. For example, the total supply voltage is 5V, only the first case can occur; if the total supply voltage is 12V, a third condition occurs when the supply voltage value is greater than or equal to 9V, a second condition occurs when the supply voltage value decays to less than 9V, greater than 6V, and so on.
In this embodiment, the first pulse signal controls the on/off of the first color bead D1, the second pulse signal controls the on/off of the second color bead D2, and the third pulse signal controls the on/off of the third color bead D3. The first color lamp bead D1, the second color lamp bead D2 and the third color lamp bead D3 are R color lamp beads, G color lamp beads and B color lamp beads, so that the first pulse signal, the second pulse signal and the third pulse signal are respectively started in the time periods of t1, t2 and t3 to be lighted by the R color lamp beads, the G color lamp beads and the B color lamp beads.
Example 2
This embodiment is a control circuit based on embodiment 1, as shown in fig. 6-12, comprising an LED lighting assembly, a constant current driving unit 1 and a switching unit,
in a further aspect of this embodiment, the LED lighting assembly includes a first color bead D1, a second color bead D2, and a third color bead D3.
Specifically, the positive electrode of the first color lamp bead D1 is connected with the power supply voltage VDD, the negative electrode of the first color lamp bead D1 is connected with the positive electrode of the second color lamp bead D2, the negative electrode of the second color lamp bead D2 is connected with the positive electrode of the third color lamp bead D3, and the negative electrode of the third color lamp bead D3 is connected with the constant current driving unit 1.
In this embodiment, the switch unit is used for turning on and off the first color bead D1, the second color bead D2 and the third color bead D3.
In a more preferable technical scheme of the embodiment, the switch unit is a MOS transistor, the MOS transistor includes a first MOS transistor Q1, a second MOS transistor Q2, and a third MOS transistor Q3, and the first MOS transistor, the second MOS transistor, and the third MOS transistor are connected in series. It should be noted that the MOS transistor is illustrated as a PMOS transistor, and in other embodiments, the MOS transistor may also be an NMOS transistor, and the embodiment and the drawing are both PMOS transistors, which are not described in detail.
Specifically, the first MOS transistor Q1 is connected in parallel with the first color bead D1, and is configured to control on/off of the first color bead D1; the second MOS tube Q2 is connected with the second color lamp bead D2 in parallel and is used for controlling the on and off of the second color lamp bead D2; the third MOS tube Q3 is connected with the third color lamp bead D3 in parallel and is used for controlling the on and off of the third color lamp bead D3.
In this embodiment, the gates of the first MOS transistor Q1, the second MOS transistor Q2, and the third MOS transistor Q3 are connected to the PWM signal terminal of the logic control unit, and the on/off of the first MOS transistor Q1, the second MOS transistor Q2, and the third MOS transistor Q3 are controlled by the PWM signal. The logic control unit in this embodiment is a logic control unit commonly used in the prior art, and may also be a micro control unit such as an MCU.
It should be noted that the first pulse signal, the second pulse signal and the third pulse signal are PWM signals, the PWM signal for controlling the first color bead D1 is the first pulse signal, the PWM signal for controlling the second color bead D2 is the second pulse signal, and the PWM signal for controlling the third color bead D3 is the third pulse signal, which will not be described in detail.
In this embodiment, the constant current driving unit 1 is connected to the control terminal of the logic control unit and is controlled by the logic control unit.
The first color lamp bead D1, the second color lamp bead D2 and the third color lamp bead D3 are R color lamp beads, G color lamp beads and B color lamp beads, the first color lamp bead D1 is the R color lamp bead, the second color lamp bead D2 is the G color lamp bead, the third color lamp bead D3 is the B color lamp bead, the MOS tube is a PMOS tube for example, so that a specific working mode is described:
the source electrode of the first MOS tube Q1 is connected with the power supply voltage VDD, and the drain electrode is connected with the cathode of the R color lamp bead and the source electrode of the second MOS tube; the drain electrode of the second MOS tube Q2 is connected with the negative electrode of the G-color lamp bead and the source electrode of the third MOS tube Q3; the drain electrode of the third MOS tube Q3 is connected with the cathode of the B-color lamp bead and the constant current driving unit 1.
In the first case, when the supply voltage VDD value is < 6V, the constant current value of the constant current driving unit 1 is set to 3*I o ：
The PWM signal controls the first MOS transistor Q1 to be closed, the second MOS transistor Q2 is conducted with the third MOS transistor Q3, at the moment, the R-color lamp bead is lighted, and the G-color lamp bead and the B-color lamp bead are turned off, as shown in fig. 6.
The PWM signal controls the first MOS transistor Q1 to be conducted with the third MOS transistor Q3, the second MOS transistor Q2 to be closed, the G-color lamp bead is lightened, and the R-color lamp bead and the B-color lamp bead are extinguished at the moment, as shown in fig. 7.
The PWM signal controls the first MOS transistor Q1 to be conducted with the second MOS transistor Q2, the third MOS transistor Q3 is turned off, the B-color lamp bead is turned on, and the G-color lamp bead and the R-color lamp bead are turned off at the moment, as shown in fig. 8.
In the second case, when the supply voltage VDD value is 9V > and is more than or equal to 6V, the constant current value of the constant current driving unit 1 is set to 1.5I o ：
The PWM signal controls the first MOS transistor Q1 to be closed with the second MOS transistor Q2, the third MOS transistor Q3 to be conducted, at the moment, the R color lamp bead and the G color lamp bead are lighted, and the B color lamp bead is turned off, as shown in fig. 9.
The PWM signal controls the first MOS transistor Q1 to be conducted, the second MOS transistor Q2 and the third MOS transistor Q3 to be closed, at the moment, the G-color lamp bead and the B-color lamp bead are lighted, and the R-color lamp bead is turned off, as shown in fig. 10.
The PWM signal controls the first MOS transistor Q1 and the third MOS transistor Q3 to be closed, the second MOS transistor Q2 is conducted, at this time, the R color lamp bead and the B color lamp bead are lighted, and the G color lamp bead is turned off, as shown in FIG. 11.
In the third case, when the supply voltage VDD value is not less than 9V, the constant current value of the constant current driving unit 1 is set to I o :
The PWM signal controls the first MOS transistor Q1, the second MOS transistor Q2, and the third MOS transistor Q3 to be turned off, and at this time, the R color lamp bead, the G color lamp bead, and the B color lamp bead are all turned on, as shown in fig. 12.
In this embodiment, the first case, the second case and the third case correspond to the three timing diagrams of fig. 3, fig. 4 and fig. 5, respectively, and the turn-on and turn-off frequencies of the first MOS transistor Q1, the second MOS transistor Q2 and the third MOS transistor Q3 are in kilohertz level. The pulse width of the PWM signal (the PWM signal is the first pulse signal) in the first case is set within 0-1/3*t, the pulse width of the PWM signal (the PWM signal is the second pulse signal) in the second case is set within 0-1/3*t, and the pulse width of the PWM signal (the PWM signal is the third pulse signal) in the third case is set within 0-t.
Example 3
This embodiment is a display device employing embodiment 2.
The display device includes a plurality of control circuits disclosed in embodiment 2, and the plurality of control circuits are connected in parallel or in other connection manners to form the display device, such as an LED display screen.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (5)
1. The LED wide voltage self-adaptive control method is characterized by comprising the following steps of:
acquiring a time sequence period t for controlling the LED luminous component;
evenly dividing the timing period t into three periods t1, t2 and t3, t1=t2=t3=1/3×t;
acquiring pulse signals, wherein the pulse signals comprise a first pulse signal, a second pulse signal and a third pulse signal, the first pulse signal controls the on and off of a first color lamp bead D1, the second pulse signal controls the on and off of a second color lamp bead D2, and the third pulse signal controls the on and off of a third color lamp bead D3;
acquiring a power supply voltage value;
the first pulse signal, the second pulse signal and the third pulse signal are configured to be started in the time periods of t1, t2 and t3 according to the power supply voltage value;
the control method also comprises the steps of configuring a constant current value;
the specific configuration method for configuring the first pulse signal, the second pulse signal and the third pulse signal to be opened in the time periods t1, t2 and t3 comprises the following steps:
when the power supply voltage value is less than 6V, the first pulse signal, the second pulse signal and the third pulse signal are respectively selected from one time period within the time periods of t1, t2 and t3 as an openable time period, and the first pulseThe signal, the second pulse signal and the openable period selected by the third pulse signal are not overlapped; the first pulse signal, the second pulse signal and the third pulse signal are selected from 0-1/3*t, and the constant current value is 3*I o ；
When the power supply voltage value is more than 9V and is more than or equal to 6V, the first pulse signal, the second pulse signal and the third pulse signal are respectively selected from two time periods within the time periods of t1, t2 and t3 to serve as openable time periods, and only one openable time period is overlapped between the two openable time periods selected by the first pulse signal, the second pulse signal and the third pulse signal; the first pulse signal, the second pulse signal and the third pulse signal are selected from 0-1/3*t, and the constant current value is configured to be 1.5 xI o ；
When the power supply voltage value is more than or equal to 9V, the first pulse signal, the second pulse signal and the third pulse signal can be started in the time periods of t1, t2 and t3 at the same time; the first pulse signal, the second pulse signal and the third pulse signal are selected from the widths of 0-t, and the constant current value is configured as I o ；
Wherein, the I is o The standard constant current value is set when the first pulse signal, the second pulse signal and the third pulse signal are simultaneously started in the pulse period t and the pulse signal width is 0-t.
2. A control circuit comprising the LED wide voltage adaptive control method of claim 1, characterized by comprising an LED lighting assembly, a constant current driving unit and a switching unit;
the LED luminous component comprises a first color lamp bead D1, a second color lamp bead D2 and a third color lamp bead D3;
the positive electrode of the first color lamp bead D1 is connected with the power supply voltage, the negative electrode of the first color lamp bead D1 is connected with the positive electrode of the second color lamp bead D2, the negative electrode of the second color lamp bead D2 is connected with the positive electrode of the third color lamp bead D3, and the negative electrode of the third color lamp bead D3 is connected with the constant current driving unit;
the switch unit is used for switching on and off the first color lamp bead D1, the second color lamp bead D2 and the third color lamp bead D3.
3. The control circuit of claim 2, wherein the switching unit is a MOS transistor, and the MOS transistor includes a first MOS transistor Q1, a second MOS transistor Q2, and a third MOS transistor Q3;
the first MOS tube Q1, the second MOS tube Q2 and the third MOS tube Q3 are connected in series;
the first MOS tube Q1 is connected with the first color lamp bead D1 in parallel and is used for controlling the on and off of the first color lamp bead D1;
the second MOS tube Q2 is connected with the second color lamp bead D2 in parallel and is used for controlling the on and off of the second color lamp bead D1;
the third MOS tube Q3 is connected with the third color lamp bead D3 in parallel and is used for controlling the on and off of the third color lamp bead D3;
the grid electrodes of the first MOS tube Q1, the second MOS tube Q2 and the third MOS tube Q3 are connected with PWM signal ends of the logic control unit;
the constant current driving unit is connected with the control end of the logic control unit.
4. The control circuit of claim 2, wherein the first color bead D1, the second color bead D2 and the third color bead D3 are any one of the following six combinations in sequence:
r-color lamp beads, G-color lamp beads and B-color lamp beads;
or G-color lamp beads, R-color lamp beads and B-color lamp beads;
or B color lamp beads, G color lamp beads and R color lamp beads;
or R-color lamp beads, B-color lamp beads and G-color lamp beads;
or G-color lamp beads, B-color lamp beads and R-color lamp beads;
or B-color lamp beads, R-color lamp beads and G-color lamp beads.
5. A display device comprising the control circuit of any one of claims 2-4.
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