TWI697641B - Carry-signal controlled led lights with fast discharging and led light string having the same - Google Patents

Abstract

A carry-signal controlled LED light with fast discharging includes at least one LED and a drive unit. The drive unit includes a signal detector, a fast discharging unit, a light control unit, and a capacitor. The signal detector receives the carry light signal to provide a discharging control signal according to the carry light signal. The fast discharging unit receives the discharging control signal to control a voltage of the carry light signal fast reducing to lower than a low-level voltage. The light control unit drives the light behavior of the LED according light command content of the carry light signal. The capacitor is charged through a DC power source and the capacitor provides the required work power to the LED light when the fast discharging unit fast discharges.

Description

Carrier-controlled light-emitting diode lamp with rapid discharge and light-emitting diode lamp LED string lights

The invention relates to a light-emitting diode lamp and a light-emitting diode lamp string, in particular to a carrier-controlled light-emitting diode lamp with fast discharge and a light-emitting diode lamp string with the light-emitting diode lamp.

Because light-emitting diodes (LEDs) have the advantages of high luminous efficiency, low power consumption, long life, fast response, high reliability, etc., light-emitting diodes have been widely used in light bar (light bar) or light string (light string) series, parallel or series-parallel connection, used in lighting lamps or decorative lighting, such as Christmas tree lighting, sports shoes lighting effects... etc.

Taking festival lighting as an example, a complete light-emitting diode lamp basically includes a light-emitting diode string (having a plurality of lights) and a driving unit for driving the light. The driving unit is electrically connected to the light string, and by providing the required power to the light and a control signal with luminous data, it is controlled in a point-controlled or synchronous manner to achieve diversified light output effects of LED lamps And change.

With the advancement of technology, the control signal with light-emitting data can be carried on the power line through the carrier wave, which can realize the function of providing power and data transmission with the same circuit structure, so as to simplify the wiring design and reduce the circuit volume. And it is conducive to the design of the control circuit.

The driving unit mainly provides a light-emitting control signal with a high voltage level and a low voltage level to drive the light-emitting diode string. For the drive of the light string, usually the light string contains the series connected When the number of light diodes increases, the thicker and longer the connection line connecting the light-emitting diodes will increase the parasitic capacitive reactance of the light-emitting diode string, making the system not fast enough for signal processing, thus increasing misjudgment Possibility of luminous signal. To effectively prevent the LED string from misinterpreting the lighting control signal, it is necessary to slow down the conversion speed of the lighting control signal between high voltage and low voltage. However, the LED string can drive fewer lights Or the light color changes slower.

Please refer to FIG. 1, which is a schematic diagram of the light-emitting control signal waveform of a related art light-emitting diode string. Figure 1 contains two light-emitting control signal waveforms, a first waveform Cv1 and a second waveform Cv2. In addition, the abscissa represents the time t, the ordinate represents the input voltage Vin, and is marked with a low-level voltage Vlow and a reset voltage Vreset, where the low-level voltage Vlow is the voltage for identifying the light-emitting control signal to a low level, and the reset voltage Vreset is the voltage for resetting the light-emitting diode. Take the second waveform Cv2 as an example. It is a sign of the natural discharge of the light-emitting control signal. Therefore, the problem is that when the parasitic capacitance of the line is too large, the discharge time will be longer, resulting in the failure to enter the next cycle. Reaching the low level voltage low makes it impossible to recognize (identify) the light-emitting control signal as the low level, that is, continue to determine the high level voltage. In this situation, the only way to increase the width between the two cycles is to enable the natural discharge to reach the low level voltage low, and to reach the identification of the low level voltage low. However, this control method is only suitable when the number of lights connected in series in the light string is small to achieve a better control effect, that is, because it cannot provide a complete lighting control signal with fast discharge, this control method cannot It is suitable for a large number of lamps in series (for example, the number of lamps above a hundred), that is, it is impossible to ensure that all lamps in series can receive a complete lighting control signal.

Based on this, the light-emitting control signal can be controlled by the fast discharge circuit to quickly reduce its voltage level or the light-emitting diode string with a small total parasitic capacitance of the line can easily cause the light-emitting control signal to quickly reduce its voltage level, as in the first The waveform Cv1 is shown. Only when the light-emitting control signal decreases rapidly, it is easy to It is easy to happen that the light-emitting control signal is lower than the recognizable low-level voltage Vlow (such as time t2), and then continues to decrease rapidly, so that the light-emitting control signal touches the reset voltage Vreset (such as time t3), making the circuit unnecessary Misoperation of resetting, causing abnormal judgment and misoperation of the LED module.

The prior art uses a set of signal voltage generating circuits on the control circuit to clamp the voltage so that the voltage does not drop to the reset voltage Vreset. But after all, the circuit is more complicated. Therefore, how to design a fast discharge carrier-controlled LED lamp and LED string with the LED lamp to solve the problem that the voltage of the lighting control signal is too small due to the parasitic capacitive reactance The reset voltage is touched, and the problem of abnormal judgment and misoperation of the light-emitting diode module is caused, and a more streamlined circuit is a major problem that the inventors of the present application intend to overcome and solve.

The purpose of the present invention is to provide a carrier-controlled light-emitting diode lamp with fast discharge, which solves the problem that when the parasitic capacitance of the line is too large, the discharge time is longer, which leads to the inability to reach the low level voltage, and makes it impossible to recognize that the light control signal is low The question of level.

In order to achieve the aforementioned purpose, the carrier-controlled light-emitting diode lamp with fast discharge provided by the present invention includes at least one light-emitting diode and a driving unit. The driving unit is coupled to the light emitting diode, and the driving unit receives a carrier light emitting signal to control the light emitting diode to emit light. The driving unit includes a signal detector, a fast discharge unit, a light-emitting control unit and a capacitor. The signal detector receives the carrier light signal and provides a discharge control signal according to the carrier light signal. The rapid discharge unit receives the discharge control signal and controls the voltage of the carrier light emitting signal to be lower than a low level voltage rapidly. The light emitting control unit drives the light emitting diode according to the light emitting command content of the carrier light emitting signal The luminous behavior of the body. The capacitor receives a DC power supply for charging, and when the fast discharge unit discharges quickly, the capacitor provides the operating power required by the light emitting diode lamp.

In one embodiment, the carrier-controlled LED lamp further includes a voltage clamping unit. The voltage clamping unit is coupled to the fast discharge unit, and when the voltage of the carrier light-emitting signal is less than the low level voltage, the voltage clamping unit clamps the voltage of the carrier light-emitting signal to be greater than a reset voltage.

In one embodiment, the fast discharge unit is a resistor.

In one embodiment, the fast discharge unit is a series structure composed of a resistor and a transistor.

In one embodiment, the fast discharge unit is a transistor.

In an embodiment, the greater the resistance of the resistor, the faster the voltage of the carrier light signal decreases.

In one embodiment, the larger the on-resistance of the transistor is, the faster the voltage of the carrier light signal decreases.

In one embodiment, the transistor is a metal oxide semiconductor field effect transistor.

In one embodiment, the signal detector generates a control signal to turn off the analog circuit in the LED lamp.

In an embodiment, the LED lamp is a point-controlled control method or a synchronous control method.

With the proposed carrier-controlled LED lamp with fast discharge, the voltage level of the light-emitting control signal can be quickly reduced below the recognizable low-level voltage, and by shortening the recognizable low-level voltage It can realize the complete discharge of the light-emitting control signal to reach a recognizable low-level voltage to ensure that all the lights in series can receive the complete light-emitting control signal.

Another object of the present invention is to provide a light-emitting diode light string with fast discharge, which solves the problem that when the parasitic capacitance of the line is too large, the discharge time is longer, resulting in the inability to reach the low level voltage, making it impossible to identify the lighting control signal as The problem of low level.

In order to achieve the aforementioned purpose, the carrier-controlled light-emitting diode string provided by the present invention includes a power cord, a controller, and at least one light-emitting diode lamp. The light-emitting diode lamp is coupled to the controller through the power cord, and receives the DC working power and the carrier light signal transmitted by the controller through the power cord.

In one embodiment, the controller includes a rectifier unit, a switch, and a control unit. The rectifier unit is coupled to the power line to provide the DC working power. The switch connects the power cord and the at least one light-emitting diode lamp. The control unit is coupled to the rectifier unit and the switch, and when the control unit controls the switch to be turned on, the DC working power forms a power supply loop for powering the light-emitting diode lamp through the power cord. When the control unit wants to generate the carrier light-emitting signal, the control unit continuously switches the switch on and off according to the light-emitting command content of the carrier light-emitting signal, so that the DC working power of the power line forms a complex pulse wave to form the The carrier light signal is transmitted to the LED lamp through the power line.

In one embodiment, the controller further includes a discharge circuit. The discharging circuit is coupled to the power line and the control unit. When the switch is turned off, the controller drives the discharging circuit to receive the DC working power, and starts to discharge the DC working power.

In one embodiment, the controller further includes a voltage adjustment capacitor. The voltage adjustment capacitor is coupled to the power line, and when the switch is turned off, the voltage-regulating capacitor provides the DC working power to the LED lamp.

With the proposed light-emitting diode string with fast discharge, the voltage level of the light-emitting control signal can be quickly reduced below the recognizable low-level voltage, and by shortening the recognizable low-level voltage In time, the complete discharge of the light-emitting control signal can reach a recognizable low-level voltage to ensure that all the lights in series can receive the complete light-emitting control signal.

In order to further understand the technology, means and effects of the present invention to achieve the intended purpose, please refer to the following detailed description and drawings of the present invention. I believe that the purpose, features and characteristics of the present invention will be thoroughly and specific. It is understood that, however, the accompanying drawings are only provided for reference and illustration, and are not intended to limit the present invention.

100: Controller

10: Power conversion circuit

20: Control circuit

30: LED string lights

31,32,…,3n: LED module

Sec: light control data

FUSE: fuse

VAR: Varistor

R10: Input resistance

C11: Input capacitance

D11~D14: Diode

CONR: control unit

Qsw: output control switch

R22, R23: resistance

C21: Capacitance

Dz: Zener diode

311: Light-emitting control unit

312: address signal processing unit

313: Address burning unit

41: voltage regulator

42: Oscillator

43: Address and Data Identifier

44: Logic Controller

45: Displacement register

46: Output buffer register

47: drive circuit

48: Address register

49: address comparator

50: address memory

51: Address burning controller

52: Burn signal detector

53: signal filter

54: signal detector

55: fast discharge unit

24: Voltage adjustment unit

551: Resistance

552: Transistor

D1: The first diode

C1: first capacitor

Sc: control signal

Lp: power cord

Vlow: Low level voltage

Vreset: reset voltage

Vd: luminous drive signal

Vth: Reference voltage value

Vac: AC power

Vdc: DC power supply

Cv1: First waveform

Cv2: second waveform

Cv3: third waveform

Cv4: Fourth Wave

t1~t4: time point

Figure 1: A schematic diagram of the light-emitting control signal waveform of a related art LED string.

2A: is a circuit block diagram of the first embodiment of the driving system of the LED string with carrier control according to the present invention.

Fig. 2B is a circuit block diagram of the second embodiment of the driving system of the LED string with carrier control according to the present invention.

Fig. 3A is a detailed circuit diagram of an embodiment of the power conversion circuit and the control circuit in Fig. 2A.

Fig. 3B: A detailed circuit diagram of the power conversion circuit and the control circuit in Fig. 2B.

Fig. 3C is a detailed circuit diagram of another embodiment of the power conversion circuit and the control circuit in Fig. 2A.

Fig. 4A is a circuit block diagram of the first embodiment of the light emitting diode module of the present invention.

4B-4D are circuit block diagrams of three specific circuits of the first embodiment of the light-emitting diode module of the present invention.

Fig. 5A is a circuit block diagram of the second embodiment of the light emitting diode module of the present invention.

5B to 5D are circuit block diagrams of three specific circuits of the second embodiment of the light emitting diode module of the present invention.

The technical content and detailed description of the present invention are described below with the drawings.

Please refer to FIG. 2A, which is a circuit block diagram of the first embodiment of the driving system of the LED string with carrier control according to the present invention. The driving system of the first embodiment includes a power conversion circuit 10, a control circuit 20 and a light-emitting diode string 30. Wherein, the power conversion circuit 10 and the control circuit 20 can be integrated into the controller 100, specifically, it can be realized by a physical circuit control box including the power conversion circuit 10 and the control circuit 20. The power conversion circuit 10 receives the AC power source Vac and converts the AC power source Vac into a DC power source Vdc. The DC power source Vdc can be generated on an output capacitor (not shown) connected across the output of the power source conversion circuit 10.

The control circuit 20 receives the DC power supply Vdc to provide the DC power supply required by the control circuit 20 and the LED string 30. The controller 100 is coupled to the AC power source Vac and the LED string 30 through the power line Lp. Broadly speaking, the power line Lp is not limited by the label in Figure 2A. As long as it can be used as a line for transmitting the power provided by the AC power supply Vac or the DC power supply Vdc, it should belong to the power line Lp, such as the AC power supply Vac and the power conversion circuit 10, the electrical connection between the control circuit 20 and the anode end of the light emitting diode string 30, or the electrical connection between the control circuit 20 and the cathode end of the light emitting diode string 30. In this embodiment, the light-emitting diode string 30 includes a plurality of light-emitting diode modules (or light-emitting diode lamps) 31, 32,..., 3n, and the light-emitting diode modules 31, 32 ,...,3n is It is connected in series and electrically connected to the control circuit 20. In this implementation, the light-emitting diode string 30 is a light string with a burning function, so each of the light-emitting diode modules 31, 32,..., 3n has its own burning process for light-emitting data and address data. The digital and analog circuits will be explained later.

The control circuit 20 can be wired (wired) or wireless (wireless). In addition to its built-in light emission data, it can also receive light emission control data Sec from the outside, so that the control circuit 20 can control the light emitting diode according to the content of the light emission control data. Each of the light-emitting diode modules 31, 32,..., 3n of the light string 30 performs light-emitting control. For example, the user can transmit the light emission control data Sec to the control circuit 20 in a wired manner by operating a computer, so that the control circuit 20 performs light emission control according to the light emission control data Sec. Alternatively, the user can wirelessly transmit the lighting control data Sec to the control circuit 20 by operating a mobile phone or a wearable device, so that the control circuit 20 can perform lighting control according to the lighting control data Sec. However, the present invention is not limited by the manner of transmitting the light emission control data Sec and the operated user device.

Please refer to FIG. 2B, which is a circuit block diagram of the second embodiment of the driving system of the LED string with carrier control according to the present invention. The main difference between the second embodiment and the first embodiment shown in FIG. 2A lies in the light-emitting diode modules 31, 32,..., 3n of the light-emitting diode string 30 of the former (ie, the second embodiment). It is connected in parallel and electrically connected to the control circuit 20. In this embodiment, since the light-emitting diode modules 31, 32,..., 3n are connected in parallel, the control circuit 20 and the light-emitting diode modules 31, 32,..., 3n are connected in parallel. The direct current power supply Vdc is directly supplied with power, such as but not limited to battery cells. That is, compared with the first embodiment of FIG. 2A, the operation of converting the AC power Vac to the DC power Vdc by the power conversion circuit 10 is omitted. Similarly, the light-emitting diode string 30 is a light string with a programming function, so each of the light-emitting diode modules 31, 32,..., 3n has its own digital bit for programming the light-emitting data and address data. The analogy line will be explained later.

Please refer to FIGS. 3A and 3B, which are detailed circuit diagrams of the power conversion circuit and the control circuit in FIGS. 2A and 2B, respectively. The power conversion circuit 10 includes a fuse FUSE and a varistor VAR, input resistance R10, input capacitance C11 connected in parallel with input resistance R10, and a full-bridge rectifier composed of complex diodes D11~D14. The fuse FUSE and the varistor VAR respectively provide overcurrent and overvoltage protection for the power conversion circuit 10. The input resistor R10 and the input capacitor C11 are coupled between the fuse FUSE, the varistor VAR and the full-bridge rectifier. The excess energy can be absorbed by the input capacitor C11 to adjust the total amount provided to the LED string 30 Voltage size. After the AC power source Vac is rectified by the full-bridge rectifier, the output is a DC power source Vdc and is connected across the output capacitor C2 at both ends of the output of the power conversion circuit 10.

The control circuit 20 includes a control unit CONR, an output control switch Qsw, and a control unit CONR operating voltage generating circuit. The control unit CONR is coupled to the output control switch Qsw and the control unit CONR operating voltage generating circuit. The output control switch Qsw receives the DC power Vdc and is controlled by the control unit CONR to turn on or off the DC power Vdc and transmit it to the LED string 30. In this embodiment, the output control switch Qsw is coupled to the anode end of the light-emitting diode string 30, and it is a p-channel MOSFET (p-channel MOSFET) through a resistor R23 Coupled to the control unit CONR. However, in other embodiments, the output control switch Qsw can also be coupled to the cathode end of the light-emitting diode string 30, and it is an n-channel MOSFET, which is coupled to the control unit through a resistor R23 CONR can achieve the equivalent characteristics of the circuit.

In this embodiment, the operating voltage generating circuit of the control unit CONR includes a resistor R22, a capacitor C21, and a Zener diode Dz. The capacitor C21 is connected in parallel with the Zener diode Dz, and then connected with the resistor R22, but the present invention is not limited by this. The Zener diode Dz receives the DC power supply Vdc via the resistor R22, and clamps the DC power supply Vdc at a predetermined fixed voltage value to provide the operating voltage required by the control unit CONR. However, the present invention is not limited to the structure of the operating voltage generating circuit of the control unit CONR shown in FIG. 3A. As long as the circuit structure can achieve the function of generating operating voltage, it should be included in the scope of the present invention.

See FIG. 3C for cooperation, which is a detailed circuit diagram of another embodiment of the power conversion circuit and the control circuit in FIG. 2A. Compared with FIG. 3A, the control circuit 20 further includes a voltage adjustment unit 24, which can be a rapid discharge circuit for adjusting the rapid discharge or voltage of the DC operating power provided to the LED string 30 The adjustment unit 24 may be a voltage adjustment capacitor for adjusting the slow discharge of the DC working power provided to the LED string 30.

If the voltage adjustment unit 24 is a voltage adjustment capacitor, the voltage adjustment unit 24 is coupled to both ends of the light-emitting diode string 30 in parallel, and according to the capacitance value (capacitive reactance) provided by it, the voltage adjustment unit 24 is provided to the light-emitting diode The DC working power of the body lamp string 30 slows the discharge.

If the voltage adjustment unit 24 is a fast discharge circuit, the voltage adjustment unit 24 is coupled to the output control switch Qsw, the light emitting diode string 30, and the control unit CONR, and is controlled by the control unit CONR. When the control unit CONR controls the output control switch Qsw to be turned off, the control unit CONR reduces the voltage (or output voltage) output to the light-emitting diode string 30 in a discharge manner, or controls the fast discharge circuit ( Voltage adjustment unit 24), or by controlling the rapid discharge circuit (detailed later) in each LED module 31, 32,..., 3n to quickly reduce the DC output to the LED string 30 The voltage of the working power. The control unit CONR turns on the output control switch Qsw according to the set time to restore (increase) the output voltage output to the light-emitting diode string 30, and generate a light-emitting drive signal according to the received light-emitting control data Sec to make the light-emitting diode The body light string 30 operates in the light-emitting mode according to the light-emitting drive signal.

Conversely, when there is no light-emitting drive signal to be transmitted to the light-emitting diode string 30, the control unit CONR controls the output control switch Qsw to be turned on, so that the DC power supply Vdc output by the power conversion circuit 10 (that is, the DC work Electricity) supplies power to the LED string 30 via the output control switch Qsw. Therefore, as long as the output control switch Qsw is controlled to be turned off or on, the light-emitting drive signal and the power supply can be transmitted to the light-emitting diode string 30 under the same circuit structure.

Please refer to FIG. 4A, which is a circuit block diagram of the first embodiment of the light emitting diode module of the present invention. Specifically, the first embodiment uses a point control method to control the light emitting diode module. As mentioned above, the light-emitting diode string 30 is a light string with a burning function, so each of the light-emitting diode modules 31, 32,..., 3n has its own programming process for light-emitting data and address data. Digital and analog circuits, such as a light-emitting control unit 311 responsible for light-emitting control, an address signal processing unit 312 responsible for address signal processing, and an address burning unit 313 responsible for address burning. As shown in FIG. 4A, the light-emitting diode module 31 with the burning function is taken as an example (the other light-emitting diode modules 32,..., 3n have the same circuit block, and will not be repeated), the light-emitting diode module 31 (i.e. light-emitting diode lamp) includes voltage regulator 41, oscillator 42, address and data identifier 43, logic controller 44, shift register 45, output buffer register 46, drive circuit 47, bit Address register 48, address comparator 49, address memory 50, address programming controller 51, programming signal detector 52, signal filter 53, signal detector 54, fast discharge unit 55, The first diode D1 and the first capacitor C1.

Incidentally, the light-emitting control unit 311 includes the aforementioned address and data identifier 43, the logic controller 44, and the shift register 45. The light emitting control unit 311 is used to drive the light emitting behavior of the light emitting diode according to the light emitting command content of the carrier light emitting signal. Among them, the content of the light-emitting command corresponds to the light-emitting behavior (mode) of the light-emitting diode, such as color change, light-off (dark) mode, light-off frequency... and so on. The address signal processing unit 312 includes the aforementioned address register 48, an address comparator 49, and an address memory 50. The address burning unit 313 includes the above-mentioned address burning controller 51 and the burning signal detector 52.

Incidentally, the light-emitting diode module shown in FIG. 4A is applied to the series connection of FIG. 2A and FIG. 3A, so a voltage regulator 41 is required for voltage regulation and stabilization. Furthermore, the light-emitting diode module shown in FIG. 4A adopts a point-controlled operation mode, so the light-emitting diode module has an address for processing address data (including operations such as judgment, memory, programming, etc.) The signal processing unit 312 and the address burning unit 313 include the address register 48, the address comparator 49, the address memory 50, and the address burning unit 313. The recording controller 51 and the recording signal detector 52. In other words, if the light-emitting diode module adopts a synchronous operation mode, the address signal processing unit 312 and the address burning unit 313 can be omitted, and only the light-emitting control unit 311 for light-emitting data processing is required.

The voltage stabilizer 41 receives the input voltage, and provides voltage regulation and control to it, so that the provided output voltage remains stable. The oscillator 42 generates a periodic clock signal as a time reference for maintaining the light-emitting control unit 311, the address signal processing unit 312, and the address burning unit 313 to operate normally and orderly. Therefore, when the oscillator 42 enters the sleep mode to stop oscillating, the light-emitting control unit 311, the address signal processing unit 312, and the address burning unit 313 enter the sleep mode under control.

The address and data identifier 43 is coupled to the oscillator 42; the logic controller 44 is coupled to the address and data identifier 43; the shift register 45 is coupled to the logic controller 44; the output buffer register 46 is coupled to the shift register The device 45 is also coupled to the driving circuit 47. The driving circuit 47 is coupled to a plurality of light emitting diodes.

The address register 48 is coupled to the logic controller 44; the address comparator 49 is coupled to the logic controller 44 and the address register 48; the address memory 50 is coupled to the address comparator 49. The address burning controller 51 is coupled to the address memory 50; the burning signal detector 52 is coupled to the address memory 50 and the address burning controller 51.

The light-emitting drive signal generated by the control circuit 20 is transmitted to the light-emitting diode module 31, filtered by the signal filter 53, and provided to the address and data recognizer 43 for recognition. After identification, the address and data recognizer 43 respectively recognizes the address data (information) and the light-emitting data (information) in the light-emitting drive signal, and the address and data recognizer 43 transmits the address data and the light-emitting data to Logic controller 44. The logic controller 44 transmits the address data to the address register 48. However, it is not limited to this, and the address data can also be sent to the address register 48 by the address and data recognizer 43 after the address and data recognizer 43 recognizes the address data.

The address comparator 49 receives the address data of the address register 48, and also receives the local address data stored in the address memory 50, and then compares the address data with the local address data. If the address data is the same as the local address data, it means that the current light-emitting data received by the logic controller 44 is the light-emitting control data of the light-emitting diode module 31. At this time, the address comparator 49 informs The logic controller 44 transmits the light-emitting data to the driving circuit 47 through the displacement register 45 and the output buffer register 46 for driving the light-emitting diodes. Conversely, if the address data is different from the local address data, it means that the current light-emitting data received by the logic controller 44 is not the light-emitting control data of the light-emitting diode module 31, but other light-emitting diodes. The light emission control data of one of the modules 32,..., 3n.

When the programming signal detector 52 detects the programming start signal, the programming signal detector 52 notifies the address programming controller 51. At this time, the address burning controller 51 starts to receive the burning address data, and burns the burning address data into the address memory 50, so that the address memory 50 stores the local address data.

As mentioned above, the output control switch Qsw receives the DC power supply Vdc, and when the output control switch Qsw is turned on, the DC power supply Vdc is transmitted to the light emitting diode module 31. As shown in FIG. 5A, a path of the DC power supply Vdc is through the first diode D1 and the first capacitor C1, and charges the first capacitor C1. When the output control switch Qsw is turned off, so that the DC power Vdc cannot be transmitted to the LED module 31, the first capacitor C1 is used to provide the power required by the internal circuit of the LED module 31. Moreover, according to the energy storage capacity of the first capacitor C1 (that is, the size of the first capacitor C1), the condition of supplying the power required by the internal circuit can be determined. When necessary (when the first capacitor C1 is not enough to provide the power required by the internal circuit), the signal detector 54 can output the control signal Sc to control the more power-consuming analog circuit to enter the sleep or energy-saving mode to improve the LED The performance of module 31.

Another path of the DC power supply Vdc is through the first diode D1 and the signal detector 54. The signal detector 54 controls the fast discharging unit 55 according to the detected DC power source Vdc, so that the voltage level of the light-emitting control signal is quickly reduced below the recognizable low-level voltage. By shortening the recognizable low-level voltage time, the complete discharge of the light-emitting control signal can be realized to be recognizable Low level voltage to ensure that all the lights in series (especially the light string with a lower number of lights in series) can receive a complete lighting control signal.

Further, the voltage regulator 41 acts as a voltage clamp here to prevent the voltage level from touching the reset voltage Vreset when the voltage level of the light-emitting control signal drops rapidly (see FIG. 1 for cooperation), so that the circuit is avoided Unnecessary reset misoperations occur, resulting in abnormal judgments and misoperations of the light emitting diode module 31. The voltage regulator 41 is a voltage clamping unit coupled to the fast discharge unit 55. When the voltage of the carrier light emitting signal is lower than the low level voltage, the voltage clamping unit clamps the carrier light signal voltage to be greater than the reset voltage Vreset.

Please refer to FIGS. 4B to 4D, which are circuit block diagrams of three specific circuits of the first embodiment of the light emitting diode module of the present invention. In FIG. 4B, the rapid discharge unit 55 can be realized by a resistor 551. The two ends of the resistor 551 are coupled to the two ends of the voltage regulator 41, and the voltage level of the light emission control signal can be reduced through the energy consumption of the resistor 551. Specifically, when the designed impedance of the resistor 551 is larger, the voltage level drops faster; conversely, the smaller the impedance of the resistor 551 is, the voltage level drops slower. In this way, the effect of rapid discharge is realized.

In FIG. 4C, the rapid discharge unit 55 can be realized by a series structure formed by a resistor 551 coupled in series with a transistor 552. The two ends of the series structure are coupled to the two ends of the voltage regulator 41, and the gate of the transistor 552 is coupled to the signal detector 54. Similarly, the signal detector 54 controls the transistor 552 to turn on, so that the series resistance of the MOSFET's on-resistance Rds(on) and the resistor 551 is used as a reduction in the voltage level of the light-emitting control signal, so as to achieve a rapid discharge effect. Specifically, when the designed impedance of the resistor 551 is larger, the voltage level drops faster; conversely, the smaller the impedance of the resistor 551 is, the voltage level drops slower. Similarly, the larger the on-resistance Rds(on) of the transistor 552, the faster the voltage level drops; on the contrary, the smaller the on-resistance Rds(on) of the transistor 552, the slower the voltage level drops. .

In FIG. 4D, the fast discharge unit 55 can be realized by a transistor 552, such as but not limited to a metal oxide semiconductor field effect transistor (MOSFET). Taking a MOSFET as the transistor 552 as an example, its source and drain are respectively coupled to two ends of the regulator 41, and its gate is coupled to the signal detector 54. The signal detector 54 controls the transistor 552 to turn on, so that the on-resistance Rds(on) of the MOSFET is used as a reduction in the voltage level of the light-emitting control signal, so as to achieve the effect of rapid discharge.

Please refer to FIG. 5A, which is a circuit block diagram of the second embodiment of the light emitting diode module of the present invention. Specifically, in the second embodiment, the light emitting diode module is controlled in a synchronous manner. The light-emitting diode module 31 with a synchronization signal includes a voltage regulator 41, an oscillator 42, a signal detector 54, a fast discharge unit 55, a synchronization and control logic unit 61, a light-emitting signal generation unit 62, an output logic unit 63, The driving circuit 47, the first diode D1 and the first capacitor C1.

The synchronization and control logic unit 61 is used to transmit the synchronization clock signal to the light-emitting signal generating unit 62. The light-emitting signal generating unit 62 is used to transmit the light-emitting control signal to the output logic unit 63. According to the light-emitting control signal, the output logic unit 63 controls the driving circuit 47 to drive the light-emitting diode.

As mentioned above, the output control switch Qsw receives the DC power supply Vdc, and when the output control switch Qsw is turned on, the DC power supply Vdc is transmitted to the light emitting diode module 31. As shown in FIG. 5A, a path of the DC power supply Vdc is through the first diode D1 and the first capacitor C1, and charges the first capacitor C1. When the output control switch Qsw is turned off, so that the DC power Vdc cannot be transmitted to the light emitting diode module 31, the first capacitor C1 is used to provide the power required by the internal circuit of the light emitting diode module 31. Moreover, according to the energy storage capacity of the first capacitor C1 (that is, the size of the first capacitor C1), the condition of supplying the power required by the internal circuit can be determined. When necessary (when the first capacitor C1 is not enough to provide the power required by the internal circuit), the signal detector 54 can output the control signal Sc to control the more power-consuming analog circuit to enter the sleep or energy-saving mode to improve the LED The performance of module 31.

Another path of the DC power supply Vdc is through the signal detector 54. The signal detector 54 controls the fast discharging unit 55 according to the detected DC power source Vdc, so that the voltage level of the light-emitting control signal is quickly reduced below the recognizable low-level voltage. By shortening the recognizable low-level voltage time, the complete discharge of the light-emitting control signal can be realized to reach the recognizable low-level voltage, so as to ensure that the number of lights in series (especially the string with the lower number of lights) Able to receive complete lighting control signal.

Further, the voltage regulator 41 acts as a voltage clamp here to prevent the voltage level from touching the reset voltage Vreset when the voltage level of the light-emitting control signal drops rapidly (see FIG. 1 for cooperation), so that the circuit is avoided Unnecessary reset misoperations occur, resulting in abnormal judgments and misoperations of the light emitting diode module 31.

Please refer to FIGS. 5B to 5D, which are circuit block diagrams of three specific circuits of the second embodiment of the light emitting diode module of the present invention. In FIG. 5B, the rapid discharge unit 55 can be realized by a resistor 551. The two ends of the resistor 551 are coupled to the two ends of the voltage regulator 41, and the voltage level of the light emission control signal can be reduced through the energy consumption of the resistor 551. Specifically, when the designed impedance of the resistor 551 is larger, the voltage level drops faster; conversely, the smaller the impedance of the resistor 551 is, the voltage level drops slower. In this way, the effect of rapid discharge is realized.

In FIG. 5C, the rapid discharge unit 55 can be realized by a series structure formed by a resistor 551 coupled in series with a transistor 552. The two ends of the series structure are coupled to the two ends of the voltage regulator 41, and the gate of the transistor 552 is coupled to the signal detector 54. Similarly, the signal detector 54 controls the transistor 552 to turn on, so that the series impedance of the MOSFET's on-resistance Rds(on) and the resistor 551 is used as a reduction in the voltage level of the light-emitting control signal to achieve a rapid discharge effect. Specifically, when the designed impedance of the resistor 551 is larger, the voltage level drops faster; conversely, the smaller the impedance of the resistor 551 is, the voltage level drops slower. Similarly, the greater the on-resistance Rds(on) of the transistor 552, the greater the The faster the voltage level drops; conversely, the smaller the on-resistance Rds(on) of the transistor 552 is, the slower the voltage level drops.

In FIG. 5D, the fast discharge unit 55 can be realized by a transistor 552, such as but not limited to a metal oxide semiconductor field effect transistor (MOSFET). Taking a MOSFET as the transistor 552 as an example, its source and drain are respectively coupled to two ends of the regulator 41, and its gate is coupled to the signal detector 54. The signal detector 54 controls the transistor 552 to turn on, so that the on-resistance Rds(on) of the MOSFET is used as a reduction in the voltage level of the light-emitting control signal, so as to achieve the effect of rapid discharge.

In summary, the present invention has the following features and advantages:

1. It can realize the function of transmitting the light-emitting drive signal and power supply to the light-emitting diode string under the same circuit structure.

2. The fast discharge unit of each LED module can provide fast discharge control light-emitting drive signal to quickly reduce its voltage level, which can realize the complete discharge of the light-emitting control signal to reach a recognizable low-level voltage to ensure All the lights in series (especially the light string with the lower number of lights in series) can receive a complete lighting control signal.

3. Through simple circuit components, such as resistors and transistors, the selection or design of their impedance values can be used to control and adjust rapid discharge.

4. Effectively reduce the power consumption of these analog circuits in the light-emitting diode module, while maintaining the normal driving operation of the light-emitting diode module.

5. The light-emitting diode module can adopt point-controlled operation mode or synchronous operation mode, which can not only improve the flexibility and convenience of control circuit design, but also realize the diversified light output effects of light-emitting diode lamps And change.

6. Through the path provided by the first diode and the first capacitor, when the DC power cannot be transmitted to the light-emitting diode module, the energy storage of the first capacitor is used to provide the inside of the light-emitting diode module The power required by the circuit to maintain the normal operation of the LED module without being affected by the drop in signal voltage.

The above are only detailed descriptions and drawings of the preferred embodiments of the present invention. However, the features of the present invention are not limited to these, and are not intended to limit the present invention. The full scope of the present invention should be covered by the following claims As the standard, all embodiments that conform to the spirit of the patent application of the present invention and similar changes should be included in the scope of the present invention. Anyone familiar with the art in the field of the present invention can easily think of changes or Modifications can be covered in the following patent scope of this case.

31: LED module

311: Light-emitting control unit

312: address signal processing unit

313: Address burning unit

41: voltage regulator

42: Oscillator

43: Address and Data Identifier

44: Logic Controller

45: Displacement register

46: Output buffer register

47: drive circuit

48: Address register

49: address comparator

50: address memory

51: Address burning controller

52: Burn signal detector

53: signal filter

54: signal detector

55: fast discharge unit

Sc: control signal

D1: The first diode

C1: first capacitor

Lp: power cord

Claims (14)

A carrier-controlled light-emitting diode lamp with fast discharge, comprising: at least one light-emitting diode; and a driving unit coupled to the light-emitting diode. The driving unit receives a carrier light-emitting signal to control the light-emitting diode to perform To emit light, the driving unit includes: a signal detector that receives the carrier light-emitting signal and provides a discharge control signal according to the carrier light-emitting signal; a fast discharge unit receives the discharge control signal and controls the voltage of the carrier light-emitting signal to rapidly Less than a low level voltage; a light-emitting control unit, according to the light-emitting command content of the carrier light-emitting signal, drive the light-emitting behavior of the light-emitting diode; and a capacitor, receiving a DC power supply for charging, when the fast discharge unit quickly discharges At the time, the capacitor provides the operating power required by the LED lamp. The carrier-controlled light-emitting diode lamp with fast discharge as described in item 1 of the scope of patent application further includes: a voltage clamping unit coupled to the fast discharge unit, when the voltage of the carrier light-emitting signal is lower than the low level At the time of voltage, the voltage of the voltage clamping unit clamping the carrier light signal is greater than a reset voltage. The carrier-controlled light-emitting diode lamp with fast discharge as described in item 1 of the scope of patent application, wherein the fast discharge unit is a resistor. The carrier-controlled light-emitting diode lamp with fast discharge as described in item 1 of the scope of patent application, wherein the fast discharge unit is a series structure composed of a resistor and a transistor. The carrier-controlled light-emitting diode lamp with fast discharge as described in item 1 of the scope of patent application, wherein the fast discharge unit is a transistor. The carrier-controlled light-emitting diode lamp with fast discharge as described in item 3 or item 4 of the scope of patent application, wherein the greater the impedance of the resistor, the faster the voltage of the carrier light signal decreases. For the carrier-controlled light-emitting diode lamp with fast discharge described in item 4 or item 5 of the scope of patent application, the greater the on-resistance of the transistor is, the faster the voltage of the carrier light signal decreases. The carrier-controlled light-emitting diode lamp with fast discharge as described in item 4 or item 5 of the scope of patent application, wherein the transistor is a metal oxide semiconductor field effect transistor. The carrier-controlled light-emitting diode lamp with fast discharge as described in the first item of the scope of patent application, wherein the signal detector generates a control signal for turning off the analog circuit in the light-emitting diode lamp. The carrier-controlled light-emitting diode lamp with fast discharge as described in item 1 of the scope of patent application, wherein the light-emitting diode lamp is a point-controlled control mode or a synchronous control mode. A carrier-controlled light-emitting diode light string, comprising: a power cord; a controller coupled to the power cord; and at least one light-emitting diode lamp, the light-emitting diode lamp is the first item in the scope of patent application The carrier-controlled light-emitting diode lamp described in any one of item 10; the light-emitting diode lamp is coupled to the controller through the power cord, and receives the DC work transmitted by the controller through the power cord Power and the carrier glow signal. For the carrier-controlled light-emitting diode string described in item 11 of the scope of patent application, the controller includes: a rectifier unit coupled to the power cord to provide the DC operating power; and a switch connected to the power cord And the at least one light-emitting diode lamp; and a control unit, coupled to the rectifier unit and the switch, wherein when the control unit controls the switch to be turned on, the direct current working power forms the light-emitting diode lamp through the power cord The power supply loop for power supply; wherein, when the control unit wants to generate the carrier light-emitting signal, the control unit continuously switches the switch on and off according to the light-emitting command content of the carrier light-emitting signal, so that the DC working power of the power cord is formed The multiple pulse waves are combined to form the carrier light-emitting signal, which is transmitted to the light-emitting diode lamp through the power cord. The carrier-controlled light-emitting diode string described in item 11 of the scope of patent application, wherein the controller further includes: a discharge circuit, coupled to the power line and the control unit, and when the switch is turned off, the controller The discharging circuit is driven to receive the DC working power, and starts to discharge the DC working power. For the carrier-controlled light-emitting diode string described in item 11 of the scope of patent application, the controller further includes: a voltage adjustment capacitor coupled to the power line. When the switch is turned off, the voltage stabilizing capacitor The LED lamp provides the DC working power.

Images