CN217825419U - Adjustable EL luminescence drive circuit - Google Patents
Adjustable EL luminescence drive circuit Download PDFInfo
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- CN217825419U CN217825419U CN202222044936.7U CN202222044936U CN217825419U CN 217825419 U CN217825419 U CN 217825419U CN 202222044936 U CN202222044936 U CN 202222044936U CN 217825419 U CN217825419 U CN 217825419U
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Abstract
The utility model discloses an adjustable EL luminous drive circuit, which comprises a drive unit, a boosting unit and a full-bridge inversion unit, wherein the output end of the drive unit and the output end of the boosting unit are respectively connected with the input end of the full-bridge inversion unit; the driving unit is used for outputting a plurality of paths of driving signals with adjustable frequency and driving the switching tubes of the full-bridge inversion unit to be switched on and off by the driving signals; the voltage boosting unit is used for multiplying the direct-current voltage and inputting the multiplied voltage signal to the full-bridge inversion unit; the full-bridge inversion unit is used for controlling the luminous color and the luminous brightness of the EL luminous sheet under the action of the driving signal and the multiplied voltage signal; the beneficial effects of the utility model are that the range and the frequency through the alternating current with the output carry out independent nimble regulation through different modules, can realize to the luminous piece output steady voltage of EL and frequency, guarantee the luminance and the colour stability of the luminous piece output of EL.
Description
Technical Field
The utility model relates to an electricity is excited to give out light technical field particularly, relates to an adjustable EL drive circuit that gives out light.
Background
The color of Electroluminescence (EL) is mainly determined by different luminescent materials, the color of luminescence can be changed by changing the frequency of the excitation signal, the color of the excitation signal at 200-400 Hz is the original color of the luminescent sheet, the color is blue when the frequency is increased, and the color is green when the frequency is decreased.
Within a certain range, as the frequency of the excitation signal and the peak voltage increase, the brightness of the light emitting sheet also increases, and the lifetime thereof also decreases. In addition, the dc component of the driving voltage also significantly reduces the lifetime of the EL light emitting chip, so that the single-ended driving signal is not preferable, and the vertically symmetrical ac signal and the proper amplitude and frequency are important points to be paid attention to in designing the EL light emitting driver.
The EL luminescent sheet is equivalent to the series connection of a capacitor and a resistor in electrical characteristics, the equivalent capacitive load is about 0.2-0.9 nf/cm < 2 >, and the driving current of less than 1mA is required per square centimeter. The attenuation process of the EL sheet is represented as the reduction of the capacity of the equivalent capacitor and the increase of the resistance value of the equivalent resistor; the time for half of the initial brightness drop is half-life, typically 3000 hours, with a full life cycle of about 8000 hours. The appropriate AC voltage and AC frequency not only can obtain appropriate color and brightness, but also can prolong the service life of the EL luminescent sheet.
The common EL luminous driver adopts a self-oscillation and transformer boosting mode to generate a high-voltage alternating current signal, and has the defects that the output voltage is changed along with the change of the input voltage and the load, the working frequency is unstable, and the brightness and the color of light emitted by an EL luminous sheet are unstable after the common EL luminous driver is used for a long time.
In view of this, the present application is specifically made.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that in the prior art, voltage and frequency that provide for the EL luminescence piece are unstable, cause to use the luminescence piece for a long time after, the luminous luminance and the colour of the EL luminescence piece are not problematic, and aim at provides an adjustable EL luminescence drive circuit, can realize to EL luminescence piece output steady voltage and frequency, guarantee the luminance and the colour stability of EL luminescence piece output.
The utility model discloses a following technical scheme realizes:
an adjustable EL light-emitting drive circuit comprises a drive unit, a boosting unit and a full-bridge inversion unit, wherein the output end of the drive unit and the output end of the boosting unit are respectively connected with the input end of the full-bridge inversion unit;
the driving unit is used for outputting a plurality of paths of driving signals with adjustable frequency and using the driving signals to drive the switching tubes of the full-bridge inversion unit to be switched on and off;
the boosting unit is used for multiplying the direct-current voltage and inputting the multiplied voltage signal to the full-bridge inverting unit;
and the full-bridge inversion unit is used for controlling the luminous color and the luminous brightness of the EL luminous sheet under the action of the driving signal and the multiplied voltage signal.
In traditional EL light-emitting piece's luminous driver, what adopt usually is self-excited oscillation, transformer step-up mode produces high-pressure alternating current signal, but when adopting this kind of mode to give out light drive, voltage along with the change of input voltage and load and change can appear usually for operating frequency is unstable, thereby can cause luminous luminance and colour to take place obvious change, the utility model provides an adjustable EL light-emitting drive circuit, through the amplitude and the frequency of the alternating current with the output through different modules, independently nimble the regulation carries out, can realize to EL light-emitting piece output steady voltage and frequency, guarantees the luminance and the colour stability of EL light-emitting piece output.
Preferably, the full-bridge inversion unit includes first switch tube, second switch tube, third switch tube and fourth switch tube, the input of first switch tube the input of second switch tube the input of third switch tube and the input of fourth switch tube all with drive unit's output is connected, the output of first switch tube with the output of second switch tube all with the A end of EL luminescent plate is connected, the output of third switch tube with the output of fourth switch tube all with the B end of EL luminescent plate is connected.
Preferably, when the first switch tube and the fourth switch tube respond to a driving signal of the driving unit, the second switch tube and the third switch tube are closed; when the second switching tube and the third switching tube respond to the driving signal of the driving unit, the first switching tube and the fourth switching tube are closed.
Preferably, the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are all triodes or MOS tubes.
Preferably, when the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are MOS tubes, the source of the first switch tube and the drain of the second switch tube are both connected to the a end of the EL light emitting sheet, the source of the second switch tube is connected to the ground of the source of the fourth switch tube, the source of the third switch tube and the drain of the fourth switch tube are both connected to the B end of the EL light emitting sheet, the drain of the third switch tube and the drain of the first switch tube are both connected to the output end of the voltage boosting unit, and the gate of the first switch tube, the gate of the second switch tube, the gate of the third switch tube and the gate of the fourth switch tube are both connected to the output end of the driving unit.
Preferably, the unit that steps up includes inductance, MOS pipe Q's source ground connection is connected, MOS pipe Q's drain electrode is connected with diode D5's positive pole and inductance respectively, diode D5's negative pole is connected with diode D1 and electric capacity C5 respectively, diode D1's negative pole passes through electric capacity C1 and is connected with the inductance to and be connected with diode D2 positive pole, diode D2's negative pole is connected with diode D3's positive pole and electric capacity C4 respectively, diode D3's negative pole passes through electric capacity C2 and is connected with electric capacity C1, just diode D3's negative pole with diode D4's positive pole is connected, diode D4's negative pole is connected with electric capacity C3, electric capacity C4 and electric capacity C5 series connection, and with the voltage input after the series connection to the full-bridge inverter unit.
Preferably, the circuit further comprises a power supply circuit, the power supply circuit is used for supplying voltage to the driving unit, the boosting unit and the full-bridge inverter unit, and the power supply circuit is a linear voltage-stabilized power supply circuit formed by adopting the LM 317.
Preferably, the driving unit is an oscillator or a single chip microcomputer.
Preferably, the oscillator adopts an oscillation loop formed by an RC circuit.
Preferably, the single chip microcomputer is of the type STC8G1K08.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
the embodiment of the utility model provides a pair of adjustable EL luminescence drive circuit, through the module with the range and the frequency of the alternating current of output through difference, carry out independent nimble regulation, can realize to EL luminescence piece output steady voltage and frequency, guarantee the luminance and the colour stability of EL luminescence piece output.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of a circuit module
FIG. 2 is a schematic diagram of a full-bridge inverter unit
FIG. 3 is a schematic diagram of a boost circuit
Detailed Description
To make the objects, technical solutions and advantages of the present invention more clearly understood, the following description is given for further details of the present invention with reference to the accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention, and are not intended to limit the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example" or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the present invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the scope of the present invention.
The embodiment discloses an adjustable EL light-emitting drive circuit, which specifically comprises a drive unit, a boosting unit and a full-bridge inversion unit as shown in fig. 1 to 3, wherein the output end of the drive unit and the output end of the boosting unit are respectively connected with the input end of the full-bridge inversion unit
The driving unit is used for outputting a plurality of paths of driving signals with adjustable frequency and using the driving signals to drive the switching tubes of the full-bridge inversion unit to be switched on and off; the driving unit is an oscillator or a singlechip. The oscillator adopts a vibration loop formed by an RC circuit. The single chip microcomputer is of the type STC8G1K08.
In this embodiment, when the driving unit is configured with an oscillator, the oscillator outputs 2 in-phase square wave signals and 2 anti-phase square wave signals, the square wave frequency can be adjusted between 100Hz and 2000Hz, and the 4 square wave signals are used for driving the full bridge circuit. Under the action of square wave signals, the upper and lower bridge arms of the two half bridges are alternately conducted by the full bridge inverter circuit, and current alternately flows in from two sides of a load to form alternating current on the load.
The boosting unit is used for multiplying the direct-current voltage and inputting the multiplied voltage signal to the full-bridge inverting unit; in this embodiment, the BOOST circuit is a BOOST switch topology and a voltage doubling circuit, converts a dc voltage of 5V to 28V into a dc voltage of 60V to 150V, and has sufficient current output capability.
As shown in fig. 3, the voltage boosting unit includes an inductor and a MOS transistor Q, the source of the MOS transistor Q is grounded, the drain of the MOS transistor Q is connected to the anode of the diode D5 and the inductor, the cathode of the diode D5 is connected to the diode D1 and the capacitor C5, the cathode of the diode D1 is connected to the inductor through the capacitor C1 and the anode of the diode D2, the cathode of the diode D2 is connected to the anode of the diode D3 and the capacitor C4, the cathode of the diode D3 is connected to the capacitor C1 through the capacitor C2, the cathode of the diode D3 is connected to the anode of the diode D4, the cathode of the diode D4 is connected to the capacitor C3, the capacitors C3, C4 and C5 are connected in series, and the voltage after the series connection is input to the full-bridge inverter unit.
In the booster circuit, the booster circuit drives the switching tube Q by a pulse signal with a frequency of more than 100kHz, the inductor L stores energy when the Q is switched on, the voltage on the inductor L rises and charges C5 through D5 when the Q is switched off, the C5 charges C1 through D1 when the Q is switched on in a 2 nd period, the voltage on the inductor L is superposed with the voltage on the C1 and then charges C4 through D2 when the Q is switched off in a 2 nd period, the C4 charges C2 through D3 when the Q is switched on in a 3 rd period, and the voltage on the inductor L is superposed with the voltage on the C2 and then charges C3 through D4 when the Q is switched off in a 3 rd period. Then, each cycle charges C3, C4, and C5, the voltages of C3, C4, and C5 are connected in series to obtain a 3-time inductor voltage value, the inductor voltage depends on the conduction time and the conduction current of the switching tube Q, and the output voltage can be changed by adjusting the conduction time.
The BOOST circuit adopts a BOOST switch topology double-voltage rectifying circuit, the output voltage is easy to reach more than 10 times of the input direct-current voltage, the output voltage can be flexibly adjusted, meanwhile, the double-voltage rectifying circuit has the characteristic of limiting the output overcurrent, and the circuit is stable and reliable; the boost inductor works at a switching frequency above 100kHz, and audio noise generated by load current change is small.
And the full-bridge inversion unit is used for controlling the light-emitting color and the light-emitting brightness of the EL light-emitting sheet under the action of the driving signal and the multiplied voltage signal. Full-bridge contravariant unit includes first switch tube, second switch tube, third switch tube and fourth switch tube, the input of first switch tube the input of second switch tube the input of third switch tube and the input of fourth switch tube all with drive unit's output is connected, the output of first switch tube with the output of second switch tube all with the A end of EL luminescence piece is connected, the output of third switch tube with the output of fourth switch tube all with the B end of EL luminescence piece is connected.
When the first switching tube and the fourth switching tube respond to the driving signal of the driving unit, the second switching tube and the third switching tube are closed; when the second switching tube and the third switching tube respond to the driving signal of the driving unit, the first switching tube and the fourth switching tube are closed.
The first switch tube, the second switch tube, the third switch tube and the fourth switch tube are all triodes or MOS tubes. A full-bridge circuit is formed by adopting a triode or an MOSFET, the output power depends on the performance of a switching tube, and the large current output capacity can be realized so as to drive a large-area EL light-emitting sheet.
Work as first switch tube the second switch tube third switch tube and when fourth switch tube was the MOS pipe, the source electrode of first switch tube and the drain electrode of second switch tube all with the A end of EL luminescent sheet is connected, the source electrode of second switch tube with the source electrode ground connection of fourth switch tube is connected, the source electrode of third switch tube with the drain electrode of fourth switch tube all with the B end of EL luminescent sheet is connected, the drain electrode of third switch tube with the drain electrode of first switch tube all with the output of the unit that steps up is connected, the grid of first switch tube the grid of second switch tube, the grid of third switch tube and the grid of fourth switch tube all with the output of drive unit is connected.
As shown in fig. 2, the oscillator outputs driving signals 1 and 4 in the 1 st period, the switching tubes Q1 and Q4 of the full bridge are turned on, Q2 and Q3 are turned off, and the current flows from the a end to the B end of the EL light-emitting chip through Q1 and then to the ground through Q4; in the 2 nd period, the switching tubes Q2 and Q3 are turned on, Q1 and Q4 are turned off, and the current flows from the B end to the A end of the EL light-emitting sheet through the Q3 and then to the ground through the Q2, and the two periods are alternately repeated, so that an alternating current signal is generated on the EL light-emitting sheet.
The circuit further comprises a power supply circuit, the power supply circuit is used for supplying voltage to the driving unit, the boosting unit and the full-bridge inversion unit, and the power supply circuit is a linear voltage-stabilized power supply circuit formed by adopting the LM 317. .
According to the adjustable EL light-emitting drive circuit disclosed by the embodiment, independent and flexible adjustment is performed through different modules according to the amplitude and the frequency of the output alternating current, stable voltage and frequency can be output to the EL light-emitting sheet, and the stability of the brightness and the color output by the EL light-emitting sheet is ensured.
The above-mentioned embodiments further describe the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. An adjustable EL light-emitting drive circuit is characterized by comprising a drive unit, a boosting unit and a full-bridge inversion unit, wherein the output end of the drive unit and the output end of the boosting unit are respectively connected with the input end of the full-bridge inversion unit;
the driving unit is used for outputting a plurality of paths of driving signals with adjustable frequency and using the driving signals to drive the switching tubes of the full-bridge inversion unit to be switched on and off;
the boosting unit is used for multiplying the direct-current voltage and inputting the multiplied voltage signal to the full-bridge inversion unit;
and the full-bridge inversion unit is used for controlling the light-emitting color and the light-emitting brightness of the EL light-emitting sheet under the action of the driving signal and the multiplied voltage signal.
2. The adjustable EL light-emitting driving circuit as claimed in claim 1, wherein the full-bridge inverter unit comprises a first switch tube, a second switch tube, a third switch tube and a fourth switch tube, the input terminals of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are all connected to the output terminal of the driving unit, the output terminals of the first switch tube and the second switch tube are all connected to the A terminal of the EL light-emitting sheet, and the output terminals of the third switch tube and the fourth switch tube are all connected to the B terminal of the EL light-emitting sheet.
3. The adjustable EL light-emitting driver circuit as claimed in claim 2, wherein when the first switch and the fourth switch are responsive to the driving signal of the driving unit, the second switch and the third switch are closed; when the second switching tube and the third switching tube respond to the driving signal of the driving unit, the first switching tube and the fourth switching tube are closed.
4. The adjustable EL luminescence driving circuit of claim 3, wherein the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are all transistors or MOS transistors.
5. The adjustable EL light-emitting driving circuit according to claim 4, wherein when the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are MOS tubes, the source of the first switch tube and the drain of the second switch tube are both connected to the a end of the EL light-emitting sheet, the source of the second switch tube and the source of the fourth switch tube are grounded, the source of the third switch tube and the drain of the fourth switch tube are both connected to the B end of the EL light-emitting sheet, the drain of the third switch tube and the drain of the first switch tube are both connected to the output end of the voltage boosting unit, and the gate of the first switch tube, the gate of the second switch tube, the gate of the third switch tube and the gate of the fourth switch tube are all connected to the output end of the driving unit.
6. The adjustable EL light-emitting driving circuit according to any one of claims 1 to 5, wherein the voltage boosting unit comprises an inductor and a MOS transistor Q, a source of the MOS transistor Q is grounded, a drain of the MOS transistor Q is connected to an anode of a diode D5 and the inductor, a cathode of the diode D5 is connected to a diode D1 and a capacitor C5, a cathode of the diode D1 is connected to the inductor through a capacitor C1 and is connected to an anode of a diode D2, a cathode of the diode D2 is connected to an anode of a diode D3 and a capacitor C4, a cathode of the diode D3 is connected to the capacitor C1 through a capacitor C2, a cathode of the diode D3 is connected to an anode of the diode D4, a cathode of the diode D4 is connected to the capacitor C3, the capacitor C4 and the capacitor C5 are connected in series, and a voltage after the series connection is input to the full-bridge inverter unit.
7. The adjustable EL luminescence driving circuit of claim 6, further comprising a power circuit, wherein the power circuit is used for supplying voltage to the driving unit, the boosting unit and the full-bridge inverting unit, and the power circuit is a linear regulated power circuit formed by LM 317.
8. An adjustable EL luminescence driving circuit according to claim 1, wherein the driving unit is an oscillator or a single chip microcomputer.
9. The tunable EL luminescence driving circuit of claim 8, wherein the oscillator is an oscillation loop formed by an RC circuit.
10. The adjustable EL luminescence driving circuit of claim 8, wherein the single-chip microcomputer is of type STC8G1K08.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222044936.7U CN217825419U (en) | 2022-08-04 | 2022-08-04 | Adjustable EL luminescence drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222044936.7U CN217825419U (en) | 2022-08-04 | 2022-08-04 | Adjustable EL luminescence drive circuit |
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| Publication Number | Publication Date |
|---|---|
| CN217825419U true CN217825419U (en) | 2022-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222044936.7U Active CN217825419U (en) | 2022-08-04 | 2022-08-04 | Adjustable EL luminescence drive circuit |
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| CN (1) | CN217825419U (en) |
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- 2022-08-04 CN CN202222044936.7U patent/CN217825419U/en active Active
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