CN215073054U - LED lamp string driving control system - Google Patents
LED lamp string driving control system Download PDFInfo
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- CN215073054U CN215073054U CN202120372145.XU CN202120372145U CN215073054U CN 215073054 U CN215073054 U CN 215073054U CN 202120372145 U CN202120372145 U CN 202120372145U CN 215073054 U CN215073054 U CN 215073054U
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Abstract
The utility model relates to a light emitting diode lamp cluster drive control system, including the control unit and the signal generation unit, the signal generation unit includes: the switch element comprises a first end, a second end and a control end, wherein one end of the control unit is electrically connected to the control end, and the second end is electrically connected to the negative end of the light-emitting diode lamp string; the voltage stabilizing element is electrically connected with the negative end of the light-emitting diode lamp string; the control unit is used for controlling the switch element to be conducted, and the power supply unit is used for directly driving the light-emitting diode lamp string to emit light; the control unit is also used for controlling the switch element to be cut off, and the power supply unit is used for driving the light-emitting diode lamp string to emit light through the voltage stabilizing element.
Description
Technical Field
The present invention relates to a driving control system for a light emitting diode lamp string, and more particularly to a driving control system for a light emitting diode lamp string.
Background
The existing LED lamp strings generally comprise a series connection mode and a parallel connection mode, because the series connection lamp strings connect a plurality of LEDs in series, the failure rate is high when the LED lamp strings are used, and as long as one LED fails, other LEDs cannot be lightened, so that most of the existing LED lamp strings are connected in parallel. For example, chinese patent CN210274608U discloses a light emitting diode light string control system, as shown in fig. 1, the light emitting control command sent by the control unit of the driving control system is sent to the light emitting diodes to realize the lighting change of the light emitting diode light string, and the control unit controls the on/off of the switch unit and the second power supply to cooperate to generate a signal sequence, so that a plurality of parallel light emitting diodes operate synchronously or in point control.
Because the drive control circuit of the patent is driven by the anode of the light-emitting diode lamp string, the supply voltage of the main control circuit of the system is lower than that of the light-emitting diode lamp string, and the control circuit cannot normally control the on/off of the switch unit, the patent can only be used for controlling and driving a single light-emitting diode lamp string, and the connection of the light-emitting diode lamp string is limited to a parallel connection mode, so that the drive control circuit is difficult to be suitable for driving 2 or more than 2 light-emitting diode lamp strings or the light-emitting diode lamp strings connected in a series connection mode. In practice, when 2 strings or more than 2 strings of led strings need to be driven, the number of electronic components needed is usually large, and the circuit is too complex to be cost-effective. Meanwhile, the patent is also limited in that the power supply capacity of the second power supply is weak, and when the number of the light emitting diode lamp strings is large, a good driving effect cannot be achieved.
Further, chinese patent CN 1026966282 also proposes a LED driving scheme, but the technical scheme is definitely limited to driving a series LED string, and when the LED string of this technical scheme is used, at least one capacitor needs to be added to each LED unit to store the power for driving the LED control circuit and the LEDs of the individually controlled LED units. This results in complex circuitry and circuitry of the drive control system for the light string, which is not conducive to cost control of the product, but also adversely affects the aesthetics and simplicity of the product.
Therefore, a low power consumption is realized by a simple driving circuit, which can drive both the parallel led strings and the series led strings.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a two-wire type light emitting diode lamp cluster drive control system is provided, through the negative pole end with signal generation unit electric connection in emitting diode, realize the negative pole drive of lamp cluster, its drive power is strong, is convenient for drive the emitting diode lamp cluster of various connected modes, and signal generation unit can realize through a switching element and voltage stabilizing element, makes the utility model discloses a circuit is simple, has reduced product cost, meanwhile, the utility model discloses a emitting diode both can be the series connection and also can connect in parallel or the combination of dual mode, solves above-mentioned technical problem from this.
In order to achieve the above object, the present invention provides a two-wire led lamp string driving control system, which comprises a control unit and a signal generating unit, wherein the signal generating unit comprises:
the switch element comprises a first end, a second end and a control end, wherein one end of the control unit is electrically connected to the control end, and the second end is electrically connected to the negative end of the light-emitting diode lamp string;
the voltage stabilizing element is electrically connected with the negative end of the light-emitting diode lamp string;
the control unit is used for controlling the switch element to be conducted, and the power supply unit is used for directly driving the light-emitting diode lamp string to emit light;
the control unit is also used for controlling the switch element to be cut off, and the power supply unit is used for driving the light-emitting diode lamp string to emit light through the voltage stabilizing element.
According to the light-emitting diode lamp string driving control system, the voltage stabilizing element is a voltage stabilizing diode.
According to the led light string driving control system, the voltage stabilizing element comprises a voltage stabilizing circuit, and the voltage stabilizing circuit comprises at least one darlington transistor circuit.
According to the led light string driving control system, the voltage regulator circuit comprises a first transistor, a second transistor, a fourth resistor, a fifth resistor, a sixth resistor and a capacitor, wherein,
the collector of the first transistor is electrically connected to the current source through the fourth resistor, the base of the first transistor is electrically connected to the collector of the second transistor, the emitter of the second transistor is connected to the cathode of the light emitting diode lamp string, the base of the second transistor is electrically connected to the current source through the fifth resistor, and the sixth resistor and the capacitor are electrically connected to the base of the second transistor respectively.
According to the light-emitting diode lamp string driving control system, the light-emitting diode lamp string driving control system further comprises a short-circuit protection unit, wherein the short-circuit protection unit is electrically connected to the first end of the switch element and the anode end of the voltage stabilizing element respectively.
According to the led light string driving control system, the wireless receiving unit comprises:
the voltage stabilizing chip is used for converting a direct current power supply into working voltage of the wireless receiving chip and is respectively connected with the direct current power supply and the power ends of the wireless receiving chip;
according to the light-emitting diode lamp string driving control system, the light-emitting diode lamp string driving control system further comprises a storage unit used for storing the address codes, the color codes and the light-emitting patterns of the light-emitting diode lamp strings, and the storage unit is electrically connected to the control unit.
According to the led light string driving control system, the first transistor is an NPN transistor, and the second transistor is a PNP transistor.
According to the light-emitting diode lamp string driving control system, the switching element is a field effect transistor, and the control unit comprises a microprocessor.
The utility model has the beneficial effects that: the utility model realizes the negative drive of the light string by electrically connecting the signal generating unit to the cathode end of the light-emitting diode, the control unit drives the switch element to control the on/off of the switch element without high voltage, and the boost processing is not needed between the control unit and the light string, so that the control voltage of the switch unit does not need to be changed no matter how many light-emitting diode light strings are connected or what connection mode of the light-emitting diode light strings are connected; the driving force is stronger than the positive driving mode, and when the power of the lamp string is larger, the positive driving mode is difficult to drive. The utility model provides a signal generation unit only needs two electronic components (for example a CMOS pipe and a zener diode), can drive emitting diode's luminous, consequently the utility model discloses a circuit is simple, can produce more economical and practical's effect. Furthermore, because the utility model discloses a need not set up the second voltage source, can realize driving emitting diode, consequently the utility model discloses power supply and signal transmission are more stable.
Drawings
Fig. 1 is a circuit diagram of a led string control system in the prior art.
Fig. 2 is a block diagram of a driving control system for a plurality of led strings according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of a driving control system for a plurality of led strings according to an embodiment of the present invention.
Fig. 4 is a schematic diagram illustrating a voltage drop period variation of led strings of a plurality of led string driving control systems according to an embodiment of the present invention.
Fig. 5 is a schematic circuit diagram of a short-circuit protection unit according to an embodiment of the present invention.
Fig. 6 is a block diagram of a driving control system for a plurality of led strings according to still another embodiment of the present invention.
Wherein, the reference numbers:
1: a light emitting diode string drive control system;
11: a control unit;
12: a signal generating unit; 121: a switching element; 122: a voltage stabilizing element;
13: a power supply unit;
14: a light emitting diode string;
15: a wireless receiving unit;
17: and a short-circuit protection unit.
Detailed Description
The following describes the structural and operational principles of the present invention in detail with reference to the accompanying drawings:
as shown in fig. 2 and fig. 3, fig. 2 is a block diagram of a plurality of led string driving control systems according to an embodiment of the present invention, and fig. 3 is a circuit diagram of a plurality of led string driving control systems according to an embodiment of the present invention.
The two-wire LED lamp string driving control system of the utility model can be mainly used for the driving control of a plurality of LED lamp strings which are connected in parallel or in series.
As shown in fig. 2, in the embodiment of the present invention, the two-wire led string driving control system 1 includes a control unit 11 and a signal generating unit 12, wherein one end of the control unit 11 is electrically connected to the power supply unit 13, the other end of the control unit is electrically connected to the signal generating unit 12, one end of the signal generating unit 12 is electrically connected to the cathode of the led string 14, and the anode of the led string is connected to the power supply unit 13.
In detail, the signal generating unit 12 includes a switching element 121 and a voltage stabilizing element 122, and the switching unit 12 includes a first terminal, a second terminal, and a control terminal. The control unit 11 is electrically connected to the control end of the switching element 121, and is configured to generate a pulse signal to control the switching element 121; the first end of the switching element 121 is grounded, and the second end is electrically connected to the negative electrode of the led string 14; the cathode terminal of the voltage-stabilizing element 122 is connected to the cathode of the led string 14, and the anode terminal of the voltage-stabilizing element 122 is connected to ground. The utility model discloses a drive control system 1 connects signal generation unit 12 in the negative pole of emitting diode lamp cluster 14, and the drive through the negative pole of emitting diode lamp cluster 14 and realize the luminous and luminous control that changes of lamp cluster 14, realize can drive the technical purpose of a plurality of parallelly connected and/or series connection's lamp cluster through setting up simple circuit.
As shown in fig. 3, the control unit 11 is electrically connected to the control end of the switch element 121, and when the control unit 11 receives the light-emitting signal, the control unit sends a control signal to the control end of the switch element 12 to control the on/off state of the switch element 121. For example, a plurality of light emission patterns (e.g., light emission colors and luminances) are provided in the control unit 11, and the control unit 11 generates a corresponding light emission control signal according to the selected light emission pattern. When different light emitting forms are not required to be generated, the control unit 11 does not generate a corresponding light emitting control signal, at this time, the control unit 11 generates a high level signal to control the switching element 121 to be turned on, the negative electrodes of the led string 14 and the cathode potential of the voltage stabilizing element 122 are pulled to a low level (i.e., 0 potential GND) by the switching element 121, the power supply unit 13 passes through the led string 14 and forms a loop through the switching element 121, and the power supply unit 13 can directly drive the led string 14 to emit light. The voltage regulator 122 is bypassed by the switch 121 and is not active, and the voltage of the negative pole of the led string 14 is equal to the voltage of the negative pole of the power supply unit 13. When different light emitting forms need to be generated, the control unit 11 generates a corresponding light emitting control signal and controls the on/off of the switch element 121 according to the light emitting control signal. When the control unit 11 generates a low level signal and controls the switching element 121 to be turned off, the power supply unit 13 forms a power supply loop through the light emitting diode string 14 and the voltage stabilizing element 122, the cathode potential of the string is pulled up to the same potential of the voltage stabilizing element by the voltage stabilizing element 122 (the specific value depends on the parameters of the voltage stabilizing diode itself and is equivalent to a high level), and the cathode voltage of the light emitting diode string 14 is the voltage of the voltage stabilizing element 122; the power supply unit 13 provides voltage to the led string 14 through the voltage regulator 122 to supply power to the led string 14. The combination of multiple breakover and cutoff according to a certain rule generates a frame signal, and a chip in the lamp string can automatically identify the generated frame signal to perform related function color change.
In the two cases, the voltage drop across the led string 14 is different, as shown in fig. 4, when the control unit 11 generates a high level signal to control the switch element 121 to be turned on, the voltage drop across the led string 14 is equal to the power voltage V of the power supply unit 13+(ii) a When the control unit 11 generates a low level signal, it controls onWhen the off-state device 121 is turned off, the voltage drop of the LED string 14 is equal to the voltage V of the voltage regulator 122D. The voltage drop across the led string 14 varies periodically by the control unit controlling the on/off of the switching element 121.
It should be pointed out that, the utility model provides a two-wire formula emitting diode lamp cluster drive control system, that is to say, the utility model discloses a transmit luminescent signal on the power cord to the mode of carrier wave realizes emitting diode's light-emitting control, consequently the utility model discloses the circuit that actually involves is also simple relatively, has not only practiced thrift the cost, and it is more succinct still to make walking of product, accords with the demand in market more.
The power supply unit 13 of this embodiment provides, for example, a +5V dc power, and the control unit 11 includes, for example, a microprocessor and a voltage regulator (not shown in the figure), where an input end of the voltage regulator is connected to the power supply unit 13, and an output end of the voltage regulator is connected to a power supply end of the microprocessor, and the voltage regulator is used for converting the power supply unit 13 into an operating voltage of the microprocessor. The switching element 121 is, for example, an N-channel enhancement type fet Q1, a gate of the fet Q1 is connected to the control unit 11, and a drain of the fet is connected to a negative electrode of the led string 14. The voltage regulator 122 is, for example, a voltage regulator diode D2, and a cathode terminal of the voltage regulator diode D2 is connected to a cathode of the led string 14. As described above, when the control unit 11 controls the fet Q1 to be turned on, the power supply unit 13 may directly drive the led string 14 to emit light, and when the control unit 11 controls the fet Q1 to be turned off, the power supply unit 13 forms a power supply loop through the led string 14 via the zener diode D2 to provide a stable voltage to the led string 14. At this time, the zener diode D2 constitutes a load element of the loop, and the voltage of the cathode of the led string 14 is the voltage of the zener diode D2. In fact, the zener diode D2 in this case draws the power of the power supply unit through the led string 14 to turn on the led string 14 to emit light.
When the number of the light emitting diode lamp strings 14 connected in series is different, the required voltage is also different, different voltage stabilizing diode voltage values can be set according to the number of the different lamp strings to adapt to different lamp string numbers, and the purpose of driving a plurality of light emitting diode lamp strings with different numbers is achieved. Therefore, the control unit 11 controls the on/off operation of the switching element 121 and the operating state of the voltage stabilizing element 122 to determine the light emitting voltage of the led string 14, thereby implementing the corresponding light emitting change of the led string 14.
Can know by above-mentioned emitting diode lamp cluster drive control process, compare with prior art, the utility model discloses a drive control system only can realize the drive of giving out light to emitting diode lamp cluster through switching element 121 and voltage stabilizing element 122 in the signal generation unit 12, consequently the utility model discloses a circuit is succinct, and signal transmission is more stable, and signal quality is better, and the error rate is lower.
Furthermore, because the utility model discloses a single current source, its power supply is more stable. The utility model discloses a connect and drive in the signal generation unit 12 of the negative pole of emitting diode lamp cluster 14, the positive pole of lamp cluster has connect voltage unit 13, therefore the opening and close that the control unit 11 drive does not need high voltage just can control switching element 121, also need not step up between control unit 11 and the emitting diode lamp cluster 14 and handle. On the whole, compare with the anodal drive of lamp cluster, the utility model discloses a when drive control system 1 drive emitting diode lamp cluster 14 was luminous, voltage stabilizing element 122's driving force was more sufficient, and the luminous luminance size variation cycle of lamp cluster is littleer, and its luminous effect is more stable. And in the utility model discloses in, because field effect transistor Q1's electric current is little, consequently its low power dissipation can be on guaranteeing effective driven basis great degree ground saving cost.
As shown in fig. 2 and fig. 3, the driving control system 1 of the present embodiment further includes a wireless receiving unit 15 and a storage unit (not shown in the figure), wherein the wireless receiving unit 15 is connected to the control unit 11 and the power supply unit 13, and the wireless receiving unit 15 is wirelessly connected to an external remote controller through infrared rays or radio waves. The wireless receiving unit 15 receives an external wireless signal with a light-emitting pattern code, converts the wireless signal into a control signal of the control unit 11, and transmits the control signal to the control unit 11. The control unit 11 is set with a plurality of light-emitting patterns, and according to the selected light-emitting pattern, the control unit 11 generates a corresponding light-emitting signal according to the light-emitting pattern code containing the address code and the color code information. The memory unit is connected to the control unit 11, and the memory unit is used for storing the address code and the color code of the led string 14, and the last light-emitting pattern used before the control unit 11 is turned off. The wireless receiving unit 15 comprises a voltage stabilizing chip and a wireless receiving chip, the voltage stabilizing chip is connected with a direct current power supply VDD and used for converting the direct current power supply VDD into working voltage of the wireless receiving chip, the voltage stabilizing chip is connected with a power supply end of the wireless receiving chip, an output end of the wireless receiving chip is connected with the control unit 11, and an input end of the wireless receiving chip receives a wireless signal from an external remote controller.
Furthermore, because the utility model discloses use under the most circumstances in building outward appearance, trees, signboard and make the scenery on, consequently for ensureing safety and product result of use, the utility model discloses still set up short-circuit protection unit 17 for whether the short circuit appears in real-time detection emitting diode lamp cluster 14, carry out quick response when short circuit to emitting diode lamp cluster 14. As shown in fig. 2 and 5, fig. 5 is a schematic circuit diagram of the short-circuit protection unit 17 according to the present invention. The short-circuit protection unit 17 is electrically connected to the signal generation unit 12 and the power supply unit 13, respectively. Specifically, the short-circuit protection unit 17 is electrically connected to the first end of the switching element 121 and the anode end of the voltage stabilizing element 122, and is electrically connected to the control unit 11, so as to send a short-circuit signal to the control unit when a short circuit occurs, so that the control unit 11 turns off the light-emitting circuit of the led string 14. As shown in fig. 4, the short-circuit protection unit 17 includes a first resistor R1, a second resistor R2, a third resistor R3, and a transistor Q2 (for example, an NPN-type transistor), wherein a source terminal of the field effect transistor Q1 is connected to the first resistor R1 and the second resistor R2, the other terminal of the first resistor R1 is grounded, the other terminal of the second resistor R2 is connected to a base terminal of the transistor Q2, an emitter of the transistor Q2 is grounded, and a collector of the transistor Q2 is connected to the control unit 11, and is connected to the power supply unit 13 via the first resistor R1. The first resistor R1 is used to improve the reliability of the signal output from the short-circuit protection unit 17. In other embodiments, since the port of the control unit 11 connected to the short-circuit protection unit 17 is automatically at a high level when no signal is input, the collector may be directly connected to the control unit 11, and the connection of the first resistor R1 and the power supply unit 13 is omitted; when the transistor Q2 is turned off, the short-circuit protection unit 17 does not output a signal to the control unit 11.
Referring to fig. 6, fig. 6 is a circuit schematic diagram of a plurality of led string driving control systems according to still another embodiment of the present invention. The led string driving control system of the present embodiment is different from the driving control system shown in fig. 3 in that the voltage regulator 122 is implemented in a different circuit. As shown in fig. 5, the voltage regulator 122 of the present embodiment is formed by a voltage regulator circuit including two transistors (a first transistor Q4 and a second transistor Q3), wherein the first transistor Q4 is, for example, an NPN-type transistor, and the second transistor Q3 is, for example, a PNP-type transistor. A darlington transistor circuit is formed between the two transistors, the collector of the first transistor Q4 is electrically connected to a current source through a fourth resistor R4, the base of the first transistor Q4 is electrically connected to the collector of the second transistor Q3, the emitter of the second transistor Q3 is connected to the cathode of the led string 14, the base of the second transistor Q3 is electrically connected to the current source through a fifth resistor R5, a capacitor C5 and a sixth resistor R6 are connected in parallel between the base of the second transistor Q3 and the fifth resistor R5, and one end of the capacitor C5 and one end of the sixth resistor R6 are grounded respectively.
The control unit 11 generates a high level signal to control the switch element 121 to be turned on, the power supply unit 13 passes through the led string 14 to form a loop through the switch element 121, and the power supply unit 13 can directly drive the led string 14 to emit light. The regulator is bypassed by the switching element 121 and is inactive, and the voltage at the cathode of the led string 14 is equal to the voltage at the cathode of the power supply. When different light emitting forms need to be generated, the control unit 11 generates a corresponding light emitting control signal and controls the on/off of the switch element 121 according to the light emitting control signal. When the control unit 11 generates a low level signal and controls the switching element 121 to be turned off, the power supply unit 13 forms a power supply loop through the led string 14 by a voltage stabilizing circuit, and the voltage of the cathode of the led string 14 is the voltage of the voltage stabilizing element 122. A plurality of level signal sequences with different levels are combined into a frame signal, for example, 00001000 represents 0x08 (hexadecimal coded by 8421), 00010001 represents 0x11 (hexadecimal coded by 8421), and the specific time width parameter depends on the model parameter of the zener diode.
The present embodiment employs a voltage divider circuit whose line voltage automatically changes in accordance with a change in the supply voltage and is always substantially equal to half the supply voltage. Specifically, in this embodiment, under the condition that the light emitting diode is not changed, the corresponding voltage is matched with the light string, for example, if the light string voltage is 3V, the light emitting can be realized by using the power supply of 5V to 6V, and if the light string voltage is 6V, the light emitting can be realized by using the power supply of 10V to 12V, so that the electronic part can be stored in a large batch without exchanging components in the circuit.
Naturally, the present invention can be embodied in many other forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be made by one skilled in the art without departing from the spirit or essential attributes thereof, and it is intended that all such changes and modifications be considered as within the scope of the appended claims.
Claims (10)
1. The light-emitting diode lamp string driving control system is characterized by comprising a control unit and a signal generating unit, wherein the signal generating unit comprises:
the switch element comprises a first end, a second end and a control end, wherein one end of the control unit is electrically connected to the control end, and the second end is electrically connected to the negative end of the light-emitting diode lamp string;
the voltage stabilizing element comprises a cathode end and an anode end, and the cathode end of the voltage stabilizing element is electrically connected with the cathode end of the light-emitting diode lamp string;
the control unit is used for outputting a high level to control the conduction of the switching element, the negative end of the light-emitting diode light string and the negative end of the voltage stabilizing element are low levels, and the power supply unit is used for supplying voltage to the light-emitting diode light string;
the control unit is also used for outputting low level to control the switch element to be cut off, the negative pole end of the light-emitting diode lamp string is high level, and the power supply unit is used for supplying voltage to the light-emitting diode lamp string through the voltage stabilizing element.
2. The led light string driving control system of claim 1, wherein when the control unit outputs a high level to control the switch element to be turned on, the light emitting voltage of the led light string is the output voltage of the power supply unit.
3. The led light string driving control system of claim 1, wherein when the control unit outputs a low level to control the switch element to turn off, the light emitting voltage of the led light string is a difference voltage between the power supply unit and the voltage regulator element.
4. The LED light string driving control system according to any one of claims 1-3, wherein the voltage regulator component is a voltage regulator diode.
5. The LED light string driving control system according to any one of claims 1-3, wherein the voltage regulator component comprises a voltage regulator circuit, the voltage regulator circuit comprising at least one Darlington transistor circuit.
6. The LED light string driving control system of claim 5, wherein the voltage regulator circuit comprises a first transistor, a second transistor, a fourth resistor, a fifth resistor, a sixth resistor and a capacitor, wherein,
the collector of the first transistor is electrically connected to the current source through the fourth resistor, the base of the first transistor is electrically connected to the collector of the second transistor, the emitter of the second transistor is connected to the cathode of the light emitting diode lamp string, the base of the second transistor is electrically connected to the current source through the fifth resistor, and the sixth resistor and the capacitor are electrically connected to the base of the second transistor respectively.
7. The led light string driving control system of claim 1, further comprising a memory unit for storing address codes, color codes and lighting patterns of the led light string, wherein the memory unit is electrically connected to the control unit.
8. The LED light string driving control system of claim 6, wherein the first transistor is an NPN transistor and the second transistor is a PNP transistor.
9. The led light string driving control system of claim 1, wherein the led light strings are connected in parallel and/or in series.
10. The led light string drive control system of claim 1, wherein the switching element is a fet and the control unit comprises a microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120372145.XU CN215073054U (en) | 2021-02-10 | 2021-02-10 | LED lamp string driving control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120372145.XU CN215073054U (en) | 2021-02-10 | 2021-02-10 | LED lamp string driving control system |
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| CN215073054U true CN215073054U (en) | 2021-12-07 |
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