Light-emitting diode device controlled by stable voltage and light-emitting diode lamp string

Abstract

The invention discloses a light-emitting diode lamp string receiving direct-current voltage controlled by stable voltage and a light-emitting diode device. The light-emitting diode lamp string comprises a plurality of light-emitting diode devices and a controller. Each light-emitting diode device is provided with a positive voltage end, a negative voltage end, a data input end and a data output end, and each light-emitting diode device is coupled with a light-emitting diode. The controller comprises a positive terminal, a negative terminal and a data terminal, and the positive terminal receives the DC voltage. When the light emitting diode device does not receive the data signal, the bypass path is enabled to bypass the signal path; when the light-emitting diode device receives a data signal, the bypass path is disabled, so that the data signal is transmitted through the signal path, and the light-emitting diode device such as a driving voltage can provide stable power supply.

Description

Technical Field

[0001] The present invention relates to a light emitting diode device and a light emitting diode light string, and in particular to a light emitting diode device and a light emitting diode light string controlled by a stable voltage. Background Art

[0002] Since light-emitting diodes (LEDs) have the advantages of high luminous efficiency, low power consumption, long life, fast response speed, high reliability, etc., LEDs have been widely used in lighting fixtures or decorative lighting in the form of series, parallel or series-parallel connection of light bars or light strings, such as Christmas tree lights, sports shoe lighting effects, etc.

[0003] At present, the application of light-emitting diodes is becoming more and more popular, and its manufacturing cost is getting lower and lower, so the application of light-emitting diodes in lighting or display is becoming more and more extensive. Correspondingly, there are also more and more ways to operate and control the light-emitting behavior of light-emitting diodes. The brightness of light-emitting diodes is determined by the current flowing through the light-emitting diodes. When the current flowing through the light-emitting diodes is larger, the light-emitting diode light is brighter, and vice versa.

[0004] On the other hand, Ohm's law shows that the magnitude of the current is determined by the operating voltage received by the LED light string. When the operating voltage is higher, the current flowing through the LED light string will be greater, and vice versa. However, there are usually multiple LED light devices in the LED light string. Since the light string usually has line loss in the path of transmitting the operating voltage, the operating voltage received by each LED light device will be inconsistent due to line loss, resulting in uneven brightness of each LED light.

[0005] Therefore, how to design a LED device and LED light string with stable voltage control to avoid the problem of uneven brightness of each LED due to different working voltages received by the LED device is a major research topic that the inventor of this case wants to conduct. Summary of the invention

[0006] An object of the present invention is to provide a light emitting diode device to solve the problems existing in the prior art.

[0007] To achieve the above-mentioned purpose, the light-emitting diode device proposed in the present invention includes a positive voltage terminal, a negative voltage terminal, a data input terminal and a data output terminal, wherein the light-emitting diode device is coupled to a light-emitting diode. The light-emitting diode device receives a data signal provided by an external source through a signal path, and the light-emitting diode device is driven by power supplied by a driving voltage. When the light-emitting diode device does not receive a data signal, a bypass path is enabled to bypass the signal path so that no current flows through the signal path; when the light-emitting diode device receives a data signal, the bypass path is disabled so that the data signal is transmitted through the signal path, thereby enabling the driving voltage to provide stable power supply to the light-emitting diode device.

[0008] In one embodiment, the light emitting diode device further includes a first bypass circuit. The first bypass circuit includes a first switch, a second switch and an inverting unit. The first switch and the second switch are coupled to a driving voltage, and the second switch provides a bypass path. The inverting unit couples the first switch and the second switch, wherein the operation of the inverting unit enables the first switch and the second switch to be turned on and off complementarily.

[0009] In one embodiment, the first bypass circuit is disposed at the data output end of each light emitting diode device.

[0010] In one embodiment, the first bypass circuit is disposed at the data input terminal of each light emitting diode device.

[0011] In one embodiment, when the light-emitting diode device does not receive a data signal, the first switch is in an off state and the second switch is in an on state, thereby enabling the bypass path; when the light-emitting diode device receives a data signal, the first switch is in an on state and the second switch is in an off state, thereby disabling the bypass path, allowing the data signal to be transmitted through the signal path provided by the first switch.

[0012] In one embodiment, the light emitting diode device further comprises a first switch, a second switch and an inverting unit. The first switch and the second switch are coupled to a driving voltage, wherein the first switch is coupled to the light emitting diode in series. The inverting unit is coupled to the first switch and the second switch, wherein the operation of the inverting unit enables the first switch and the second switch to be turned on and off complementarily.

[0013] In one embodiment, the second bypass circuit further includes an impedance matching element. The impedance matching element is coupled in series with the first switch and the light emitting diode, wherein the impedance matching element provides an impedance characteristic corresponding to the light emitting diode.

[0014] Another object of the present invention is to provide a light emitting diode lamp string with stable voltage control to solve the problems existing in the prior art.

[0015] To achieve the above-mentioned purpose, the light emitting diode lamp string with stable voltage control proposed in the present invention receives a DC voltage. The light emitting diode lamp string includes a plurality of light emitting diode devices and a controller. Each light emitting diode device has a positive voltage terminal, a negative voltage terminal, a data input terminal and a data output terminal, wherein each light emitting diode device is coupled to a light emitting diode. The controller includes a positive terminal, a negative terminal and a data terminal, and the positive terminal receives a DC voltage, and the negative terminal is coupled to a ground terminal. The light emitting diode devices sequentially receive a plurality of data signals provided by the controller from the outside through a signal path, and the controller preferentially supplies power to the light emitting diode device directly coupled to the DC voltage according to the positive voltage terminal, and the other light emitting diode devices are supplied with power in sequence, so that the light emitting diode devices are sequentially supplied with power by the driving voltage. When the light emitting diode device does not receive a data signal, the bypass path is enabled to bypass the signal path, so that no current flows through the signal path. When the light emitting diode device receives a data signal, the bypass path is disabled, so that the data signal is transmitted through the signal path, and the driving voltage provides stable power supply to the light emitting diode device.

[0016] In one embodiment, the LED devices are connected in series, and the negative voltage terminal of the first LED device is coupled to the negative terminal of the controller, and the positive voltage terminal of the last LED device receives a DC voltage.

[0017] In one embodiment, the serial connection structure is an array structure with a number of 1×n. The controller provides the plurality of data signals in the order of the first LED device, the second LED device, ... until the last LED device. The controller controls the DC voltage supply in the order of the last LED device, the second to last, ... until the first LED device.

[0018] In one embodiment, the series connection structure is a matrix structure with a number of m×n. The controller provides data signals in the order of the first LED device, the second LED device, ... until the last LED device. The controller controls the DC voltage supply in the order of the n LED devices in the last row, the n LED devices in the second to last row, ... until the n LED devices in the first row.

[0019] In one embodiment, the LED devices are connected in series, and the positive voltage terminal of the first LED device receives a DC voltage, and the negative voltage terminal of the last LED device is coupled to the negative terminal of the controller.

[0020] In one embodiment, the series connection structure is an array structure with a number of 1×n. The controller provides data signals in the order of the first LED device, the second LED device, etc. until the last LED device. The controller controls the DC voltage supply in the order of the first LED device, the second LED device, etc. until the last LED device.

[0021] In one embodiment, the serial connection structure is a matrix structure with a number of m×n. The serial connection structure is a matrix structure with a number of m×n. The controller provides data signals in the order of the first LED device, the second LED device, ... until the last LED device. The controller controls the DC voltage supply in the order of the n LED devices in the first row, the n LED devices in the second row, ... until the n LED devices in the last row.

[0022] In one embodiment, the LED light string further includes a first bypass circuit. The first bypass circuit includes a first switch, a second switch and an inverting unit. The first switch and the second switch are coupled to a driving voltage, and the second switch provides a bypass path. The inverting unit couples the first switch and the second switch. The operation of the inverting unit enables the first switch and the second switch to be turned on and off complementarily.

[0023] In one embodiment, the first bypass circuit is disposed at the data output end of each light emitting diode device.

[0024] In one embodiment, the first bypass circuit is disposed at the data input terminal of each light emitting diode device.

[0025] In one embodiment, when the light emitting diode device does not receive a data signal, the first switch is in an off state and the second switch is in an on state, thereby enabling the bypass path. When the light emitting diode device receives a data signal, the first switch is in an on state and the second switch is in an off state, thereby disabling the bypass path and allowing the data signal to be transmitted through the signal path provided by the first switch.

[0026] In one embodiment, the light emitting diode device further includes a second bypass circuit. The second bypass circuit includes a first switch, a second switch and an inverting unit. The first switch and the second switch are coupled to a driving voltage, wherein the first switch is coupled to the light emitting diode in series. The inverting unit is coupled to the first switch and the second switch, wherein the operation of the inverting unit enables the first switch and the second switch to be turned on and off complementarily.

[0027] In one embodiment, the second bypass circuit further includes an impedance matching element. The impedance matching element is coupled in series with the first switch and the light emitting diode, wherein the impedance matching element provides an impedance characteristic corresponding to the light emitting diode.

[0028] The proposed stable voltage controlled LED light string provides a first bypass circuit and a second bypass circuit to achieve stable voltage control of the LED light string during data signal transmission operation and light emitting operation.

[0029] In order to further understand the techniques, means and effects adopted by the present invention to achieve the predetermined objectives, please refer to the following detailed description and drawings of the present invention. It is believed that the objectives, features and characteristics of the present invention can be deeply and specifically understood thereby. However, the drawings are only provided for reference and illustration and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 : is a circuit block diagram of the first embodiment of the LED light string with stable voltage control of the present invention.

[0031] Figure 2 : is a circuit block diagram of the second embodiment of the light emitting diode lamp string with stable voltage control of the present invention.

[0032] Figure 3 : is a circuit block diagram of the third embodiment of the light emitting diode lamp string with stable voltage control of the present invention.

[0033] Figure 4 : is a circuit block diagram of the fourth embodiment of the light emitting diode lamp string with stable voltage control of the present invention.

[0034] Figure 5 : is a circuit block diagram of the first bypass circuit of the present invention.

[0035] Figure 6 : is a circuit block diagram of the first embodiment of the detailed structure of the light emitting diode lamp device of the present invention.

[0036] Figure 7 : is a circuit block diagram of a second embodiment of the detailed structure of the light emitting diode lamp device of the present invention.

[0037] Figure 8 : is a circuit block diagram of a third embodiment of the detailed structure of the light emitting diode lamp device of the present invention.

[0038] Fig. 9 : is a circuit block diagram of a fourth embodiment of the detailed structure of the light emitting diode lamp device of the present invention.

[0039] In the figure: 11-1n: light emitting diode device 10: controller 20: first bypass circuit 30: second bypass circuit 40: Voltage control circuit 41: Voltage divider circuit 42: Transistor 43: Feedback amplifier 44: Constant voltage generator 45: Voltage follower 100: Light Emitting Diode 101: Impedance Matching Component 200:Signal Processor Q1, Q14: first switch Q2, Q13: second switch Qp: third switch Q11: switch Q12: bypass switch A1, B1: inverting unit VCC: DC voltage VDD1-VDDn: positive voltage terminal VEE1-VEEn: Negative voltage terminal DI1-Din: Data input terminal DO1-DOn: Data output terminal VDD: Positive terminal VSS: Negative terminal DO: Data terminal Vp: divided voltage Vref: reference voltage Vx: constant voltage R1, R2: resistance In1: first input terminal In2: second input terminal Out: output terminal. DETAILED DESCRIPTION

[0040] The technical content and detailed description of the present invention are described as follows with reference to the accompanying drawings.

[0041] See also Figure 1 , which is a circuit block diagram of the first embodiment of the stable voltage controlled LED light string of the present invention. The stable voltage controlled LED light string receives a DC voltage VCC, and includes a plurality of LED devices 11-1n and a controller 10. Each LED device 11-1n has a positive voltage terminal VDD1-VDDn, a negative voltage terminal VEE1-VEEn, a data input terminal DI1-DIn, and a data output terminal DO1-DOn. Figure 1 As shown, each light emitting diode device 11-1n is a four-pin (light emitting diode, LED) lamp.

[0042] The controller 10 includes a positive terminal VDD, a negative terminal VSS and a data terminal DO, and the positive terminal VDD receives the DC voltage VCC. In addition, the negative terminal VSS is grounded.

[0043] exist Figure 1In the embodiment shown, each of the light emitting diode devices 11-1n is connected in series, and the negative voltage terminal VEE1 of the first light emitting diode device 11 is coupled to the negative terminal VSS of the controller 10, and the positive voltage terminal VDDn of the last light emitting diode device 1n receives the DC voltage VCC, and the remaining power pins (positive voltage terminal VDD, negative voltage terminal VEE) are connected in series. Furthermore, the data signal pins (data input terminal DI, data output terminal DO) are also connected in series.

[0044] Specifically, the series connection structure is an array structure with a number of 1×n, which is a structure in which the power pins are connected in series and the data signal pins are connected in series. The controller 10 provides the plurality of data signals in the order of the first light-emitting diode device 11, the second light-emitting diode device 12, ... until the last light-emitting diode device 1n. In addition, the controller 10 controls the DC voltage VCC power supply in the order of the last light-emitting diode device 1n, the second to last light-emitting diode device 1n-1, ... until the first light-emitting diode device 11. Therefore, in Figure 1 In the illustrated embodiment, the order in which power is supplied is opposite to the order in which data signals are supplied.

[0045] See also Figure 2 , which is a circuit block diagram of the second embodiment of the LED light string with stable voltage control of the present invention. Figure 2 In the embodiment shown, each of the light emitting diode devices 11-mn is connected in parallel and series, and the parallel and series connection structure is a matrix structure with a number of m×n. The negative voltage terminal VEE1 of the n light emitting diode devices 11-1n in the first row is coupled to the negative terminal VSS of the controller 10, and the positive voltage terminal VDDm of the n light emitting diode devices m1-mn in the last row receives the DC voltage VCC, and the remaining power pins (positive voltage terminal VDD, negative voltage terminal VEE) are connected in series in rows. Furthermore, the data signal pins (data input terminal DI, data output terminal DO) are also connected in series.

[0046] Specifically, the controller 10 provides the plurality of data signals in the order of the first LED device 11, the second LED device 12, ... until the last LED device mn. Furthermore, the controller 10 controls the DC voltage VCC to supply power in the order of the n LED devices m1-mn in the last row, the n LED devices (m-1)1-(m-1)n in the second-to-last row, ... until the n LED devices 11-1n in the first row. Therefore, Figure 1 In the illustrated embodiment, the order in which power is supplied is opposite to the order in which data signals are supplied.

[0047] See also Figure 3, which is a circuit block diagram of the third embodiment of the LED light string with stable voltage control of the present invention. Figure 3 In the embodiment shown, each of the light emitting diode devices 11-1n is connected in series, and the positive voltage terminal VDD1 of the first light emitting diode device 11 receives the DC voltage VCC, and the negative voltage terminal VEEn of the last light emitting diode device 1n is coupled to the negative terminal of the controller 10, and the remaining power pins (positive voltage terminal VDD, negative voltage terminal VEE) are connected in series. Furthermore, the data signal pins (data input terminal DI, data output terminal DO) are also connected in series.

[0048] Specifically, the series connection structure is a 1×n array structure, which is a structure in which the power pins are connected in series and the data signal pins are connected in series. The controller 10 provides the plurality of data signals in the order of the first light-emitting diode device 11, the second light-emitting diode device 12, etc. until the last light-emitting diode device 1n. In addition, the controller 10 controls the DC voltage VCC to supply power in the order of the first light-emitting diode device 11, the second light-emitting diode device 12, etc. until the last light-emitting diode device 1n. Therefore, in Figure 3 In the illustrated embodiment, the order of supplying power is the same as the order of providing data signals.

[0049] See also Figure 4 , which is a circuit block diagram of the fourth embodiment of the LED light string with stable voltage control of the present invention. Figure 4 In the embodiment shown, each of the light emitting diode devices 11-mn is connected in parallel and series, and the parallel and series connection structure is a matrix structure with a number of m×n. The positive voltage terminal VDD1 of the n light emitting diode devices 11-1n in the first row receives the DC voltage VCC, and the negative voltage terminal VEEm of the n light emitting diode devices m1-mn in the last row is coupled to the negative terminal VSS of the controller 10, and the remaining power pins (positive voltage terminal VDD, negative voltage terminal VEE) are connected in series in rows. Furthermore, the data signal pins (data input terminal DI, data output terminal DO) are also connected in series.

[0050] Specifically, the controller 10 provides the plurality of data signals in the order of the first LED device 11, the second LED device 12, ... until the last LED device mn. Furthermore, the controller 10 controls the DC voltage VCC to supply power in the order of the n LED devices 11-1n in the first row, the n LED devices 21-2n in the second row, ... until the n LED devices m1-mn in the last row. Therefore, Figure 4 In the illustrated embodiment, the order of supplying power is the same as the order of providing data signals.

[0051] In addition to the different embodiments of the power supply sequence and data signal sequence of the light emitting diode device described above, each light emitting diode lamp string has an adjustment for abnormally large current generated by large voltage fluctuations during data signal transmission to prevent the extremely unstable working current from making stable voltage distribution (stable voltage control) extremely difficult to achieve. Therefore, when the controller 10 does not transmit a data signal, the bypass path is enabled to bypass the signal path. Conversely, when the controller 10 transmits a data signal, the bypass path is disabled so that each of the data signals is transmitted through the signal path.

[0052] See also Figure 5 It is worth mentioning that a first bypass circuit 20 is provided between each pair of light emitting diode devices, and Figure 5 The first bypass circuit 20 shown is arranged at the signal output end. Figure 5 The first bypass circuit 20 shown mainly comprises a first switch Q1, a second switch Q2 and an inverting unit A1. The inverting unit A1 is connected between the first switch Q1 and the second switch Q2, specifically, between the gate control terminals of the two switches Q1 and Q2, so as to achieve complementary control of the on and off of the first switch Q1 and the second switch Q2, thereby enabling or disabling the bypass path of the present invention. The first switch Q1, the second switch Q2 and the inverting unit A1 are disposed at a data output terminal DO of a light emitting diode device (e.g., a data output terminal DO1 of the first light emitting diode device). However, Figure 5 The first bypass circuit 20 shown is not intended to limit the present invention. Any circuit that can achieve the same technical concept can be used as the first bypass circuit of the present invention.

[0053] by Figure 5 The first switch Q1 and the second switch Q2 of the first bypass circuit 20 are NMOS as an example. Specifically, when the light emitting diode device does not receive a data signal provided by the outside (for example, but not limited to provided by the controller 10), the first switch Q1 is in a turned-off state, and after reverse control, the second switch Q2 is in a turned-on state, thereby enabling the bypass path provided by the second switch Q2 to bypass the signal path, that is, to cut off the transmission path of the data signal.

[0054] On the contrary, when the LED device receives a data signal, the first switch Q1 is turned on, and after inversion control, the second switch Q2 is turned off, thereby disabling the bypass path, so that each of the data signals is transmitted through the signal path provided by the first switch Q1.

[0055] In the conventional operation without the first bypass circuit 20, when the controller 10 transmits a data signal, there will be a larger voltage fluctuation at the signal output end (compared to when there is no data signal transmission), and a large current will be generated on the path, so that the ideal waveform (square wave) cannot be maintained for accurate identification. On the contrary, when the controller 10 does not transmit a data signal, because there is no such large current, the working current is extremely unstable in both the operation of no data signal transmission and the operation of data signal transmission, so it is extremely difficult to achieve stable voltage distribution (stable voltage control). Therefore, the first bypass circuit 20 designed by the present invention, by turning on the first switch Q1 (and turning off the second switch Q2) when there is a data signal, uses the drain-source voltage of the first switch Q1 to compensate the voltage at the signal output end, so as to maintain a stable signal output end voltage (that is, the signal output end voltage obtains a clamping effect), thereby being able to maintain a stable working current (whether in the operation of no data signal transmission or with data signal transmission), and achieve stable voltage control of the light emitting diode lamp string.

[0056] See also Figure 6 , which is a circuit block diagram of a first embodiment of the detailed structure of the light emitting diode lamp device of the present invention. The light emitting diode lamp device includes at least one light emitting diode 100, a first bypass circuit 20, a second bypass circuit 30, and a voltage control circuit 40.

[0057] The number of the light emitting diodes 100 can be, for example but not limited to, one (single color), two (red and green), three (three primary colors), four (three primary colors and white), etc., and can be increased or decreased according to actual needs. Figure 6 It is illustrated by a light emitting diode. Each light emitting diode 100 includes an anode terminal and a cathode terminal, wherein the anode terminal receives a DC voltage to operate. Incidentally, although at least one light emitting diode 100 is illustrated in the light emitting diode lamp device, it is only for the convenience of explaining the operation relationship with other circuit elements. In fact, at least one light emitting diode 100 is coupled to the light emitting diode lamp device in an external connection manner.

[0058] The circuit structure of the first bypass circuit 20 can be found in Figure 5 In this embodiment, the first bypass circuit 20 is disposed at the signal output end, that is, disposed at the data output end DO1 of the first light emitting diode device.

[0059] The first bypass circuit 20 mainly includes a first switch Q14 (corresponding to Figure 5 The first switch Q1), the second switch Q13 (corresponding to Figure 5 The second switch Q2) and the inverting unit A1 (corresponding to Figure 5 Inverting unit A1). Figure 6In the embodiment shown, the first switch Q14, the second switch Q13 and the inverting unit A1 are disposed at the data output terminal DO1 of a light emitting diode device. The first bypass circuit 20 connects the light emitting diode 100 and the second bypass circuit 30. The first bypass circuit 20, through the operation of the inverting unit A1, turns on and off the first switch Q14 and the second switch Q13 complementarily. When the controller 10 transmits the data signal, the first switch Q14 is in the on state (i.e., the first switch Q14 is controlled to be on), and after the inverting control, the second switch Q13 is in the off state, so that the bypass path is disabled, so that each of the data signals is transmitted through the signal path provided by the first switch Q14, and the voltage of the signal output terminal is compensated by the source-drain voltage of the first switch Q14 to maintain a stable voltage of the signal output terminal (i.e., the voltage of the signal output terminal obtains a clamping effect), thereby maintaining a stable working current (whether in the operation without or with data signal transmission), and realizing stable voltage control of the light emitting diode lamp string.

[0060] The second bypass circuit 30 includes an inverting unit B1 and a bypass switch group Q11, Q12. Compared with the constant voltage compensation provided by the first bypass circuit 20 for the data signal transmission operation, the second bypass circuit 30 is mainly intended to compensate the light emitting operation of the light emitting diode device for a constant voltage. The inverting unit B1 can be, for example but not limited to, an inverting gate. The second bypass circuit 30 is coupled between the positive terminal VDD and the negative terminal VSS, and the bypass switch Q12 has a first equivalent impedance when it is turned on. When the switch Q11 is turned on, the light emitting diode 100 and the switch Q11 have a second equivalent impedance, which can be regarded as the internal resistance of the light emitting diode 100 plus the internal resistance of the switch Q11 when it is turned on (i.e., Rds_on). When the switch Q11 is turned off, the bypass switch Q12 of the second bypass circuit 30 provides a first equivalent impedance equivalent to the second equivalent impedance to maintain the cross voltage at a fixed voltage. Specifically, the bypass switch Q12 of the second bypass circuit 30 is used to replace the equivalent impedance of the switch Q11 when it is turned off, so as to stabilize the voltage Vc between the positive terminal VDD and the negative terminal VSS to a fixed voltage when the switch Q11 is turned on or off.

[0061] The inverting unit B1 controls the on or off of the bypass switch Q12 to be inverse to the switch Q11, so that when the bypass switch Q12 is turned on, a first equivalent impedance equivalent to the second equivalent impedance is provided. On the other hand, the number of groups of the inverting unit B1 and the bypass switch Q12 may correspond to the number of the light emitting diodes 100, so that each light emitting diode 100 has a group of equivalently replaceable impedances, but it does not exclude that the entire light emitting diode lamp device only includes a single group of second bypass circuits 30, so that the equivalent impedances of all the light emitting diodes 100 in the entire light emitting diode lamp device are replaced by a single group of second bypass circuits 30.

[0062] It is worth mentioning that, since the first equivalent impedance when the bypass switch Q12 is turned on (i.e., Rds_on when the bypass switch Q12 is turned on) is equal to the internal resistance of the light emitting diode 100 when the switch Q11 is turned on plus the internal resistance of the switch Q11 when it is turned on (i.e., Rds_on), the internal resistance (Rds_on) of the bypass switch Q12 is bound to be higher than the internal resistance (Rds_on) of the switch Q11.

[0063] The voltage control circuit 40 is coupled to the positive terminal VDD and the negative terminal VSS and is used to fix the voltage between the positive terminal VDD and the negative terminal VSS. In addition, the switch Q11 can be coupled between the cathode terminal and the negative terminal VSS, or between the anode terminal and the positive terminal VDD, for example but not limited to.

[0064] Specifically, when the switch Q11 is turned on, a closed loop is formed between the positive terminal VDD, the anode terminal, the cathode terminal, the switch Q11 and the negative terminal VSS, and a first current is generated from the anode terminal to the cathode terminal of the light emitting diode 100. Since the DC voltages of various light emitting diode lamp devices are different in the past, the first current from the anode terminal to the cathode terminal is also different, which is the main reason for the inconsistent brightness of the light emitting diode 100.

[0065] In order to make the brightness of the light emitting diodes 100 of each light emitting diode lamp device consistent, it is necessary to control the first current to be consistent. Therefore, the present invention controls the voltage between the positive terminal VDD and the negative terminal VSS to be a fixed voltage through the voltage control circuit 40 to obtain a fixed current. Specifically, since the voltage across each light emitting diode lamp device is fixed at a fixed voltage (for example but not limited to 3V), the first current from the anode terminal to the cathode terminal of the light emitting diode 100 can be fixed to a fixed current. In this way, the first current flowing through the light emitting diode 100 can be fixed to a fixed current, so that the brightness of the light emitting diode 100 corresponds to the fixed current and presents a fixed brightness, thereby making the brightness of the light emitting diodes 100 of each light emitting diode lamp device can be controlled to be consistent. Therefore, as long as the voltage control circuit 40 (for example but not limited to, a circuit, a programmable controller with software control, an analog controller composed of hardware, or a microcontroller and other devices) that can adjust the voltage across each light emitting diode lamp device to a fixed voltage, it should be included in the scope of this embodiment.

[0066] The voltage control circuit 40 includes a voltage divider circuit 41, a transistor 42, and a feedback amplifier 43, and the voltage divider circuit 41 is coupled between the positive terminal VDD and the negative terminal VSS to generate a divided voltage Vp based on a DC voltage. The voltage divider circuit 41 is, for example but not limited to, composed of resistors R1 and R2, so that the DC voltage VDD generates a divided voltage Vp between the resistors R1 and R2. The transistor 42 is coupled between the voltage divider circuit 41 and the ground terminal VEE, and is enabled to turn on or off the path from the voltage divider circuit 41 to the ground terminal VEE. The feedback amplifier 43 includes a first input terminal In1, a second input terminal In2, and an output terminal Out, and the first input terminal In1 is coupled to the voltage divider circuit 41 to receive the divided voltage Vp provided by the voltage divider circuit 41. The second input terminal In2 receives a reference voltage Vref, and the output terminal Out is coupled to the control terminal of the transistor 42.

[0067] Further, the transistor 42 is basically controlled in the linear region. The feedback amplifier 43 provides a second control signal to the control terminal of the transistor 42 based on the divided voltage Vp and the reference voltage Vref to fix the size of the channel of the transistor 42. Therefore, the voltage control circuit 40 can adjust the potential of the negative terminal VSS by adjusting the size of the channel, so as to maintain the cross voltage at a fixed voltage by adjusting the potential of the negative terminal VSS to obtain a fixed current. Specifically, since the second control signal controls the gate-source voltage Vgs of the transistor 42 to be fixed, the drain-source voltage Vds of the transistor 42 is affected by the drain current Id flowing through the transistor 42, so that the potential of the negative terminal VSS is adjusted. Therefore, by adjusting the potential of the negative terminal VSS, the cross voltage between the positive terminal VDD and the negative terminal VSS can be maintained at a fixed voltage (for example but not limited to 3V).

[0068] like Figure 6 As shown, the voltage control circuit 40 further includes a constant voltage generator 44 (i.e., a constant voltage source) and a voltage follower 45. The constant voltage generator 44 is used to generate a constant voltage Vx, and the voltage follower 45 electrically isolates and amplifies the constant voltage Vx to generate a reference voltage Vref corresponding to the constant voltage Vx. Specifically, since the reference voltage Vref must be a stable fixed value, it may be difficult to maintain its stability if it is directly supplied by the constant voltage generator 44 alone (for example, but not limited to factors such as noise interference and loop current changes), resulting in a slight change in the reference voltage Vref to change the drain current Id of the transistor 42, resulting in the inability to maintain the cross-voltage at a fixed voltage. Therefore, the constant voltage Vx can be electrically isolated and amplified to the reference voltage Vref through the characteristics of electrical isolation and amplification of the voltage follower 45, avoiding interference from noise and maintaining the stability of the reference voltage Vref. It is worth mentioning that the constant voltage generator 44 and the voltage follower 45 can be integrated into the controller, or can be independently configured outside the controller, and can also be implemented by devices such as circuits or controllers.

[0069] On the other hand, Figure 6 The voltage control circuit 40 and the second bypass circuit 30 shown are only the most cost-effective implementations among many implementations, and they are only composed of relatively cheap circuit elements. However, the voltage control circuit 40 and the second bypass circuit 30 are not limited to only Figure 6 All circuits, controllers and other devices that can achieve the above steps and functions should be included in the scope of this embodiment.

[0070] See also Figure 7 , which is a circuit block diagram of a second embodiment of the detailed structure of the light emitting diode lamp device of the present invention. Figure 6 The biggest difference of the first embodiment shown is that the first bypass circuit 20 is set at the signal input end, that is, at the data input end DI1 of the first light-emitting diode device. Therefore, the first bypass circuit 20 is set at the front end of the signal processor 200. Before the signal enters the signal processor 200, the voltage clamp compensation is first completed to maintain a stable voltage. Then the control signal generated by the signal processor 200 is used to control the switch at the back end. In this embodiment, the first bypass circuit 20 is further feedback controlled and a constant voltage control process is added. Therefore, Figure 7 The first switch Q1 and the second switch Q2 of the first bypass circuit 20 are connected to the constant voltage generator 44 and are electrically isolated and amplified by the voltage follower 45 to generate a reference voltage Vref corresponding to the constant voltage Vx, thereby avoiding interference from noise and maintaining the stability of the reference voltage Vref.

[0071] See also Figure 8 and Fig. 9 As shown, they are circuit block diagrams of the third embodiment and the fourth embodiment of the detailed structure of the light emitting diode lamp device of the present invention. Figure 8 correspond Figure 6 The biggest difference between the two is that the second bypass circuit 30 of the latter further includes an impedance matching element 101. Fig. 9 correspond Figure 7 The biggest difference between the two is that the second bypass circuit 30 of the latter further includes an impedance matching element 101, which is described as follows.

[0072] Based on the above, Figure 8 The second bypass circuit 30 shown includes an inverting unit B1, a bypass switch group Q11, Q12 and an impedance matching element 101, wherein the impedance matching element 101 and the switch Q11 are connected in series. Figure 6In the second bypass circuit 30 shown, if only the switch Q11 is used, the light emitting diode 100 and the switch Q11 have a second equivalent impedance, and the impedance matching with the first equivalent impedance of the bypass switch Q12 can achieve a considerable effect, but if an impedance matching element 101 is added, the impedance matching effect can be better. Among them, the characteristics of the impedance matching element 101 can be equivalent to the electrical characteristics of the light emitting diode 100, so as long as this technical characteristic can be achieved, it is not limited to using a single element or using a circuit. Therefore, by designing the impedance characteristics (linear characteristics of a non-single resistance value) of the impedance matching element 101 and the impedance characteristics of the light emitting diode 100, the impedance matching effect can be better.

[0073] Similarly, see Fig. 9 The second bypass circuit 30 shown in the figure also includes an inverting unit B1, a bypass switch group Q11, Q12 and an impedance matching element 101. The operating principle and means thereof are similar to those of Figure 8 The same, so no further elaboration is given here.

[0074] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A light emitting diode device, characterized in that: include: a positive voltage terminal, a negative voltage terminal, a data input terminal and a data output terminal, wherein the light emitting diode device is coupled to a light emitting diode; The light emitting diode device receives a data signal provided by an external device through a signal path, and the light emitting diode device is driven by a driving voltage; When the light-emitting diode device does not receive the data signal, a bypass path is enabled to bypass the signal path so that no current flows through the signal path; when the light-emitting diode device receives the data signal, the bypass path is disabled so that the data signal is transmitted through the signal path, thereby enabling the driving voltage to provide stable power supply to the light-emitting diode device.

2. The light emitting diode device according to claim 1, characterized in that Further including: A first bypass circuit comprising: A first switch and a second switch are coupled to the driving voltage, and the second switch provides the bypass path; as well as An inverting unit is coupled to the first switch and the second switch, wherein the operation of the inverting unit enables the first switch and the second switch to be turned on and off complementarily.

3. The light emitting diode device according to claim 2, characterized in that: The first bypass circuit is disposed at the data output end of each of the light emitting diode devices.

4. The light emitting diode device according to claim 2, characterized in that: The first bypass circuit is disposed at the data input end of each of the light emitting diode devices.

5. The light emitting diode device according to claim 2, wherein: When the light-emitting diode device does not receive the data signal, the first switch is in an off state and the second switch is in an on state, thereby enabling the bypass path; when the light-emitting diode device receives the data signal, the first switch is in an on state and the second switch is in an off state, thereby disabling the bypass path, so that the data signal is transmitted through the signal path provided by the first switch.

6. The light emitting diode device according to claim 1, wherein: Further including: a second bypass circuit, comprising: A first switch and a second switch are coupled to the driving voltage, wherein the first switch is coupled in series to the light emitting diode; and An inverting unit is coupled to the first switch and the second switch, wherein the operation of the inverting unit enables the first switch and the second switch to be turned on and off complementarily.

7. The light emitting diode device according to claim 6, characterized in that The second bypass circuit further comprises: An impedance matching element is serially coupled to the first switch and the light emitting diode, wherein the impedance matching element provides an impedance characteristic corresponding to the light emitting diode.

8. A stable voltage controlled LED light string capable of receiving a DC voltage, characterized in that: The LED light string includes: A plurality of light emitting diode devices, each of which has a positive voltage terminal, a negative voltage terminal, a data input terminal, and a data output terminal, wherein each of the light emitting diode devices is coupled to a light emitting diode; and A controller, comprising a positive terminal, a negative terminal and a data terminal; wherein the positive terminal is coupled to the DC voltage, and the negative terminal is coupled to a ground terminal; Each of the light emitting diode devices sequentially receives a plurality of data signals provided by the controller via an external source through a signal path, and the controller preferentially supplies power to the light emitting diode device directly coupled to the DC voltage according to the positive voltage terminal, and supplies power to the other light emitting diode devices in sequence, so that each of the light emitting diode devices is sequentially powered and driven by a driving voltage; When each of the light-emitting diode devices does not receive the data signals, a bypass path is enabled to bypass the signal path so that no current flows through the signal path; when each of the light-emitting diode devices receives the data signals, the bypass path is disabled so that each of the data signals is transmitted through the signal path, thereby enabling the driving voltage to provide stable power supply to each of the light-emitting diode devices.

9. The LED light string with stable voltage control as claimed in claim 8, characterized in that: Each of the light emitting diode devices is connected in series or in parallel series, and the negative voltage end of the first light emitting diode device is coupled to the negative terminal of the controller, and the positive voltage end of the last light emitting diode device receives the DC voltage.

10. The LED light string with stable voltage control as claimed in claim 9, characterized in that: The serial connection structure is an array structure with a number of 1×n; The controller provides the plurality of data signals in the order of a first light emitting diode device, a second light emitting diode device, ... until a last light emitting diode device; The controller controls the DC voltage to supply power in the order of the last light emitting diode device, the second to last ... until the first light emitting diode device.

11. The LED light string with stable voltage control as claimed in claim 9, characterized in that: The parallel-series connection structure is a matrix structure with a number of m×n; The controller provides the plurality of data signals in the order of a first light emitting diode device, a second light emitting diode device, ... until a last light emitting diode device; The controller controls the DC voltage to supply power in the order of the n LED devices in the last row, the n LED devices in the second to last row, ... until the n LED devices in the first row.

12. The LED light string with stable voltage control as claimed in claim 8, characterized in that: Each of the light emitting diode devices is connected in series or in parallel series, and the positive voltage end of the first light emitting diode device receives the DC voltage, and the negative voltage end of the last light emitting diode device is coupled to the negative terminal of the controller.

13. The voltage-stabilized controlled LED light string according to claim 12, wherein: The serial connection structure is an array structure with a number of 1×n; The controller provides the plurality of data signals in the order of a first light emitting diode device, a second light emitting diode device, ... until a last light emitting diode device; The controller controls the DC voltage to supply power in the order of the first LED device, the second LED device, ... until the last LED device.

14. The voltage-stabilized controlled LED light string as claimed in claim 12, characterized in that: The parallel-series connection structure is a matrix structure with a number of m×n; The controller provides the plurality of data signals in the order of a first light emitting diode device, a second light emitting diode device, ... until a last light emitting diode device; The controller controls the DC voltage to supply power in the order of the n light emitting diode devices in the first row, the n light emitting diode devices in the second row, ... until the n light emitting diode devices in the last row.

15. The LED light string with stable voltage control as claimed in claim 8, characterized in that: Each of the light emitting diode devices further comprises: A first bypass circuit comprising: A first switch and a second switch are coupled to the driving voltage, and the second switch provides the bypass path; and An inverting unit is coupled to the first switch and the second switch, wherein the operation of the inverting unit enables the first switch and the second switch to be turned on and off complementarily.

16. The stable voltage controlled LED light string as claimed in claim 15, characterized in that: The first bypass circuit is disposed at the data output end of each of the light emitting diode devices.

17. The voltage-stabilized controlled LED light string as claimed in claim 15, characterized in that: The first bypass circuit is disposed at the data input end of each of the light emitting diode devices.

18. The voltage-stabilized controlled LED light string as claimed in claim 15, characterized in that: When each of the light-emitting diode devices does not receive each of the data signals, the first switch is in an off state and the second switch is in an on state, thereby enabling the bypass path; when each of the light-emitting diode devices receives each of the data signals, the first switch is in an on state and the second switch is in an off state, thereby disabling the bypass path, so that each of the data signals is transmitted through the signal path provided by the first switch.

19. The LED light string with stable voltage control as claimed in claim 8, characterized in that: Each of the light emitting diode devices further comprises: a second bypass circuit, comprising: A first switch and a second switch are coupled to the driving voltage, wherein the first switch is coupled in series to the light emitting diode; and An inverting unit is coupled to the first switch and the second switch, wherein the operation of the inverting unit enables the first switch and the second switch to be turned on and off complementarily.

20. The voltage-stabilized controlled LED light string as claimed in claim 19, characterized in that: The second bypass circuit further comprises: An impedance matching element is serially coupled to the first switch and the light emitting diode, wherein the impedance matching element provides an impedance characteristic corresponding to the light emitting diode.

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