CN216820165U - Wide-voltage-input LED light effect adjusting circuit and driving circuit thereof - Google Patents

Abstract

The utility model discloses a wide-voltage-input LED light effect regulating circuit and a driving circuit thereof, and the wide-voltage-input LED light effect regulating circuit comprises a first switch, a second switch, a first LED circuit, a second LED circuit and an isolating switch, wherein the input end of the second LED circuit is connected with a power supply input end, the output end of the first LED circuit is connected with a power supply output end, the input end of the first switch is respectively connected with a power supply input end and a driving signal input end, the output end of the first switch is connected with the input end of the first LED circuit, the input end of the second switch is respectively connected with the output end of the second LED circuit and the driving signal input end, and the output end of the second switch is connected with the power supply output end. The on-off of the first switch and the second switch is controlled according to the input voltage, so that the series-parallel connection relation between the LEDs is changed, the LED light source can adapt to the voltage input in a wide range, the loss of the whole circuit is reduced, and the light efficiency is improved.

Description

Wide-voltage-input LED light effect adjusting circuit and driving circuit thereof

Technical Field

The utility model relates to the technical field of driving circuits, in particular to a wide-voltage-input LED light effect adjusting circuit and a driving circuit thereof.

Background

The voltage input range of the existing LED lamp driving circuit is narrow, the existing LED lamp driving circuit cannot adapt to the ultra-wide voltage range of the input voltage range of AC24V-380V, and short-circuit protection during large-voltage power supply does not exist; if a wider input voltage is adapted, under a high input voltage, because the LED belongs to the constant current source, a driving circuit of the LED needs to bear redundant voltage under the high input voltage, and the loss of the whole circuit is increased. Therefore, it is desirable to design a tuning circuit that can accommodate a range while reducing losses.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problem of how to adjust the luminous efficiency of an LED circuit, and provides an LED luminous efficiency adjusting circuit with wide voltage input and a driving circuit thereof, which can adapt to voltage input in a wide range.

The utility model is realized by the following technical scheme:

on one hand, the utility model provides a wide-voltage-input LED light effect regulating circuit which comprises a first switch, a second switch, a first LED circuit, a second LED circuit and an isolating switch, wherein the input end of the second LED circuit is connected with the power input end, the output end of the first LED circuit is connected with the power output end, the second LED circuit, the isolating switch and the first LED circuit are sequentially connected, the input end of the first switch is respectively connected with the power input end and the driving signal input end, the output end of the first switch is connected with the input end of the first LED circuit, the input end of the second switch is respectively connected with the output end of the second LED circuit and the driving signal input end, and the output end of the second switch is connected with the power output end.

Because the LED belongs to the constant current source, the circuit loss of the LED driving circuit can be influenced by the size of input voltage, and the LED driving circuit can bear redundant voltage under high input voltage to cause the loss of the whole circuit to be increased, therefore, in order to ensure that the LED circuit can not only reduce the loss of the circuit but also improve the luminous efficiency of the LED under the voltage input in a wider range, the LED lamp string in the driving circuit is replaced by the luminous efficiency adjusting circuit, the first switch and the second switch are used in the luminous efficiency adjusting circuit, and the opening and closing of the first switch and the second switch are adjusted according to the condition of the input voltage, so that the series-parallel relation of the first LED circuit and the second LED circuit is changed, the input voltage is adapted, and the effects of reducing the circuit loss and improving the LED luminous efficiency are achieved.

Further, the first switch comprises a transistor Q1 and an isolation diode D11, a drain of the transistor Q1 is connected to the power input terminal, a gate of the transistor Q1 is connected to the driving signal input terminal, an anode of the isolation diode D11 is connected to a source of the transistor Q1, and a cathode of the isolation diode D11 is connected to the input terminal of the first LED circuit. In order to protect the circuit, the first switch further comprises a zener diode ZD1, the anode of the zener diode ZD1 is connected to the source of the transistor Q1, and the cathode of the zener diode ZD1 is connected to the gate of the transistor Q1.

Further, the second switch comprises a triode Q2 and an isolation diode D13, the output end of the second LED circuit is connected with the drain electrode of the triode Q2, the gate electrode of the triode Q2 is connected with the driving signal input end, the positive electrode of the isolation diode D13 is connected with the source electrode of the triode Q2, and the negative electrode of the isolation diode D13 is connected with the power supply output end. In order to protect the circuit, the second switch further comprises a zener diode ZD2, the anode of the zener diode ZD2 is connected to the source of the transistor Q2, and the cathode of the zener diode ZD2 is connected to the gate of the transistor Q2.

Further, the isolation switch can adopt 1N4007 or other isolation diodes with common models.

Further, the first switch, the second switch and the isolation switch form an IC chip in an ESOP10 or other packaging form.

On the other hand, the utility model provides an LED driving circuit with wide voltage input, comprising a voltage dividing circuit, a control circuit, and a plurality of LED light effect adjusting circuits according to the first aspect, wherein,

the voltage division circuit is used for dividing the voltage of the input power supply;

the control circuit is used for comparing the divided voltage with a preset reference voltage and outputting a driving signal;

the LED light effect adjusting circuit is used for adjusting the connection of the first LED circuit and the second LED circuit to be in series connection or in parallel connection according to the driving signal.

Furthermore, the voltage divider circuit comprises resistors R3 and R4, one end of the resistor R3 is connected to the power input terminal, the other end of the resistor R3 is connected to the control circuit input terminal and one end of the resistor R4, and the other end of the resistor R4 is connected to the ground terminal.

Furthermore, the control circuit comprises a comparison circuit and a switch driving circuit, the input end of the switch driving circuit is connected with the output end of the comparison circuit,

the output end of the switch driving circuit is connected with the driving signal input end of the LED light effect adjusting circuit, the switch driving circuit comprises a plurality of control switches, and the number of the control switches corresponds to the number of the LED circuits in the LED light effect adjusting circuit.

Furthermore, a plurality of LED light effect adjusting circuits are packaged in pairs, and the two LED light effect adjusting circuits form an IC chip in an ESOP10 or other packaging modes.

Furthermore, the voltage input range of the input power supply is 85-305 VAC/VDC.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

the utility model provides a wide-voltage-input LED light effect regulating circuit and a driving circuit thereof, wherein an LED light effect regulating circuit is adopted to replace an LED lamp string in the circuit, a switch circuit is connected to two ends of an LED circuit, and the opening and closing of the switch circuit are adjusted through the magnitude of input voltage, so that the series-parallel connection relation of a plurality of LED circuits is changed, the loss of the whole driving circuit is reduced under the input voltage in a wide range, and the light effect of an LED in the wide range is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the utility model and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the utility model and together with the description serve to explain the principles of the utility model. In the drawings:

FIG. 1 is a schematic diagram of a functional circuit connection of a wide voltage input LED light effect adjusting circuit according to the present invention;

FIG. 2 is a schematic structural diagram of a wide voltage input LED light effect adjusting circuit with driver according to the present invention;

FIG. 3 is a schematic structural diagram of two LED light effect adjusting circuits packaged as an IC according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a wide voltage input LED driving circuit according to an embodiment of the present invention;

fig. 5 is a connection diagram of an LED driving circuit structure including two IC chips according to an embodiment of the present invention.

Reference numbers and corresponding part names in the drawings:

the LED light effect control circuit comprises a 1-LED light effect adjusting circuit, 11-a first switch, 12-a second switch, 2-a control circuit, 21-a switch driving circuit and a 3-IC chip.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail in order to avoid obscuring the present invention.

Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the utility model. Thus, the appearances of the phrase "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the description of the present invention, the terms "first", "second", "input", "output", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and operate, and thus, should not be construed as limiting the scope of the present invention.

Example 1

As shown in fig. 1, this embodiment 1 provides a wide voltage input LED light effect adjusting circuit 1, which includes a first switch 11, a second switch 12, a first LED circuit, a second LED circuit and an isolating switch, wherein an input end of the second LED circuit is connected to a power input end, an output end of the first LED circuit is connected to a power output end OUT, and the second LED circuit, the isolating switch and the first LED circuit are sequentially connected, an input end of the first switch 11 is connected to a power input end VIN and a driving signal input end SW, an output end of the first switch is connected to an input end of the first LED circuit, an input end of the second switch is connected to an output end of the second LED circuit and a driving signal input end SW, and an output end of the second switch is connected to the power output end OUT.

Specifically, as shown in fig. 2, the first switch 11 includes a transistor Q1 and an isolation diode D11, a drain of the transistor Q1 is connected to the power input terminal, a gate of the transistor Q1 is connected to the driving signal input terminal, an anode of the isolation diode D11 is connected to a source of the transistor Q1, and a cathode of the isolation diode D11 is connected to the input terminal of the first LED circuit. In order to protect the circuit, the first switch further comprises a zener diode ZD1, the anode of the zener diode ZD1 is connected to the source of the transistor Q1, and the cathode of the zener diode ZD1 is connected to the gate of the transistor Q1. The second switch 12 comprises a triode Q2 and an isolation diode D13, the output end of the second LED circuit is connected with the drain electrode of the triode Q2, the gate electrode of the triode Q2 is connected with the input end of the driving signal, the positive electrode of the isolation diode D13 is connected with the source electrode of the triode Q2, and the negative electrode of the isolation diode D13 is connected with the output end of the power supply. In order to protect the circuit, the second switch further comprises a zener diode ZD2, the anode of the zener diode ZD2 is connected to the source of the transistor Q2, and the cathode of the zener diode ZD2 is connected to the gate of the transistor Q2.

More specifically, when the first LED circuit only includes one lamp LED1, and the second LED circuit only includes one lamp LED2, the isolating switch D2 employs an isolating diode of 1N4007, the isolating diodes D11 and D13 of the first switch 11 and the second switch 12 employ an isolating diode of 1N4007, and the triodes Q1 and Q2 employ a triode of 1N60, at this time, the positive electrode of the LED1 is connected to the negative electrode of the isolating switch D2 and the negative electrode of the isolating diode D11, the negative electrode of the LED1 is connected to the power output terminal, the positive electrode of the LED2 is connected to the power input terminal, and the negative electrode is connected to the drain of the triode Q2 and the positive electrode of the isolating switch D2.

In one embodiment, the first switch 11, the second switch 12 and the isolation switch may be packaged as an IC as shown in fig. 3 by means of an ESOP10, and the LED light effect adjusting circuits 1 may be packaged as one IC, where two LED light effect adjusting circuits 1 are packaged as one IC chip 3 in fig. 3; in the packaged IC, D1-D4 are divided into drains of corresponding triodes in the LED light effect adjusting circuit 1, and S1-S4 are divided into sources of corresponding triodes in the LED light effect adjusting circuit 1.

The working principle of the LED light effect adjusting circuit 1 of this embodiment is as follows: when the input power is a low voltage, the power flows into the LED lighting effect adjusting circuit 1 from the power input terminal VIN, at this time, the driving signals input into the transistors Q1 and Q2 from the driving signal input terminal SW are high level, the transistors Q1 and Q2 are both turned on, the current flows through the drain and source of the transistor Q1 from the power input terminal VIN, and then is output to the anode of the LED1 through the isolating diode D11, and the current flows into the drain and source of the transistor Q2 from the power input terminal VIN through the anode of the LED2, and then is output through the isolating diode D13; at this time, since the first switch 11 and the second switch 12 are both in the on state, the LED1 is connected in parallel with the LED2, and since the voltage drop of the isolation diode D13 is much lower than that of the LED1, the isolation diode D2 is not conductive when the LEDs 1 and 2 are connected in parallel.

When a higher input voltage is switched on, at the moment, the driving signals input into the triodes Q1 and Q2 from the driving signal input end SW are changed into low level, the triodes Q1 and Q2 are both closed, at the moment, the triodes Q1 and Q2 are approximately opened, the current of the power supply input end VIN flows into the isolation diode D12 through the LED2 and then flows into the LED1 to be output to the rear-end constant current source, in the process, the voltage of the LED circuit rises along with the input voltage, in the LED driving circuit of the constant current source, the voltage stress of the driving IC can be reduced by the rise of the LED voltage, and the output power of the driving IC is increased along with the rise of the LED voltage, and finally, the efficiency is increased.

Example 2

This embodiment 2 provides an LED driving circuit with wide voltage input, which includes a voltage divider circuit, a control circuit 2, and a plurality of LED lighting effect adjusting circuits 1 as described in embodiment 1, wherein,

the voltage division circuit is used for dividing the voltage of the input power supply;

the control circuit is used for comparing the divided voltage with a preset reference voltage and outputting a driving signal;

the LED light effect adjusting circuit is used for adjusting the connection of the first LED circuit and the second LED circuit to be in series connection or in parallel connection according to the driving signal.

The voltage division circuit comprises resistors R3 and R4, one end of a resistor R3 is connected with the power supply input end, the other end of a resistor R3 is connected with the input end of the control circuit 2 and one end of a resistor R4 respectively, and the other end of a resistor R4 is connected with the grounding end. The reference voltage circuit is used for generating a preset reference voltage; the control circuit comprises a comparison circuit and a switch driving circuit 21, the input end of the switch driving circuit 21 is connected with the output end of the comparison circuit,

the output end of the switch driving circuit 21 is connected with the driving signal input end of the LED light effect adjusting circuit, the switch driving circuit 21 comprises a plurality of control switches, and the number of the control switches corresponds to the number of the LED circuits in the LED light effect adjusting circuit.

The control switch may be a resistor, as shown in fig. 2, for each LED light effect adjusting circuit, there is a resistor corresponding to each LED light effect adjusting circuit, for example, for the first switch, the resistor R1 is connected in parallel to the drain and the gate of the transistor Q1, for the second switch 12, one end of the resistor R2 is connected to the input end (power input end) of the second LED circuit, the other end of the resistor R2 is connected to the gate of the transistor Q2, the output end of the second LED circuit is connected to the drain of the transistor Q2, the anode of the zener diode ZD2 is connected to the source of the transistor Q2, the cathode of the zener diode ZD2 is connected to the gate of the transistor Q2, the anode of the isolating diode D13 is connected to the source of the transistor Q2, and the cathode of the isolating diode D13 is connected to the power output end.

In an embodiment, the LED light effect adjusting circuits 1 may be packaged two by two, as shown in fig. 3, two LED light effect adjusting circuits 1 are packaged into one IC chip 3 by using an ESOP 10.

In another embodiment, the control switches may also be switching MOS transistors, as shown in fig. 4, when the circuit includes two LED light effect adjusting circuits 1 and the two LED light effect adjusting circuits 1 are packaged as one IC chip 3 in the circuit, four corresponding control switches are provided, the four control switches are MOS transistors QD1, QD2, QD3 and QD4 respectively, and sources of QD1-QD4 are connected with each other and then connected with the comparison circuit, gates of QD1-QD4 are connected with the comparison circuit respectively, a drain of QD1 is connected with a gate of transistor Q1, correspondingly, a drain of QD2 is connected with a gate of transistor Q2, a drain of QD3 is connected with a gate of transistor Q3, and a drain of QD4 is connected with a gate of transistor Q4.

The whole working process of the utility model is as follows:

the input power is divided by the voltage dividing circuits R1 and R2, the divided voltage value is input into the control circuit 2, the comparison circuit in the control circuit 2 compares the preset reference voltage value with the voltage value input into the divided voltage value, the higher value is considered as a higher input voltage, the lower value is considered as a lower input voltage, according to the condition, the control switch outputs a high-low level driving signal to each LED light effect adjusting circuit 1, and controls the triode action in each first switch 11 and each second switch 12, for example, when the input voltage is a higher input voltage, the comparison circuit drives 4 MOS tubes 1 to QD4 to output low levels to the grids of the triodes Q1 to Q4, the triodes Q1 to Q4 are closed, the LED circuits are connected in series, the sum of the LED1 voltage and the LED2 voltage is used as an output load voltage, and LED1 and LED2 can be arbitrary two the same voltages, and the light efficiency regulating circuit that LED1, LED2 constitute can replace the position of any one lamp pearl according to actual need.

As shown in fig. 5, in a single stage, IC1 and IC2 are respectively turned on after different DCBUS voltages are sampled, so that high input efficiency of 175V to 265V can be achieved: it is conventional to set a single voltage VLED (VIN × 1.414-30V) (the minimum operating voltage of the IC) to about 217VDC, and when the input voltage AC is input to 220V or 240V or even 265V, the corresponding excess voltage is assumed by the IC, such as: the IC loss at 265VAC is P ═ 265 × 1.414-217] _ Iled ═ (375 · 217) _ Iled ═ 158V _ Iled, assuming in this example that the LED current is 100m A, the loss is 15.8W. Note: this power is a contrast value and does not represent a real loss.

By adopting the circuit, the lamp voltage can be changed by firstly setting the conventional section voltage of 120V lamp beads and then adopting two groups of IC chips respectively packaged by two LED light effect regulating circuits. The specific process is as follows:

the switching voltages of the 2 IC chips (i.e., the reference voltages preset in the comparators) are set to 210V and 245VAC, respectively. This voltage was set to largely avoid the conventional 220 and 230V voltage regions. When the input voltage is 175-210 VAC, the lamp voltage is 217VDC, and the maximum loss is (210VAC 1.414-217DC) Iled 100m A-8W;

when the voltage is input from 211V to 245V, the loss is (211 × 1.414-217-54) × Iled 100m A ═ 27 × 100m A ═ 2.7W and (245 × 1.414-217-54) × Iled 100m A ═ 75.43 × 100m A ═ 7.5W;

when voltages from 246V to 265V are inputted, the losses are (246 x 1.414-217-54-42) i led 100m A-35 x 100m A-3.5W and (265 x 1.414-217-54-42) i led 100m A-62 x 100m A-6.2W

The loss of the circuit after the circuit is connected is obviously reduced by utilizing the utility model, and the light efficiency in a wider range is improved. By adopting the mode of the utility model, the input of extremely wide input voltage, the typical alternating current value of 85-305V, various DC voltage of 12-96V and other complex conditions can be realized.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. The utility model provides a wide voltage input's LED light efficiency regulating circuit, a serial communication port, including first switch, the second switch, first LED circuit, second LED circuit and isolator, wherein, the input of second LED circuit is connected with power input end, the output and the power output of first LED circuit are connected, and the second LED circuit, isolator and first LED circuit are connected in order, the input of first switch respectively with power input end, the drive signal input is connected, the output of first switch is connected with the input of first LED circuit, the input of second switch respectively with the output of second LED circuit, the drive signal input is connected, the output and the power output of second switch are connected.

2. The wide voltage input LED light effect regulating circuit according to claim 1, wherein the first switch comprises a transistor Q1 and an isolation diode D11, a drain of the transistor Q1 is connected with the power input terminal, a gate of the transistor Q1 is connected with the driving signal input terminal, an anode of the isolation diode D11 is connected with a source of the transistor Q1, and a cathode of the isolation diode D11 is connected with the input terminal of the first LED circuit.

3. The wide voltage input LED light effect regulating circuit according to claim 1, wherein the second switch comprises a transistor Q2 and an isolation diode D13, the output terminal of the second LED circuit is connected with the drain electrode of the transistor Q2, the gate electrode of the transistor Q2 is connected with the driving signal input terminal, the anode electrode of the isolation diode D13 is connected with the source electrode of the transistor Q2, and the cathode electrode of the isolation diode D13 is connected with the power supply output terminal.

4. The LED light effect regulating circuit with wide voltage input of claim 1, wherein the isolating switch adopts an isolating diode.

5. The wide voltage input LED light effect regulating circuit according to claim 1, wherein the first switch, the second switch and the isolating switch are packaged to form an IC chip.

6. An LED drive circuit with wide voltage input, which is characterized by comprising a voltage division circuit, a control circuit and a plurality of LED light effect adjusting circuits according to any one of claims 1 to 5, wherein,

the voltage division circuit is used for dividing the voltage of the input power supply;

the control circuit is used for comparing the divided voltage with a preset reference voltage and outputting a driving signal;

the LED light effect adjusting circuit is used for adjusting the connection of the first LED circuit and the second LED circuit to be in series connection or in parallel connection according to the driving signal.

7. The LED driving circuit with wide voltage input of claim 6, wherein the voltage divider circuit comprises resistors R3 and R4, one end of the resistor R3 is connected to the power input terminal, the other end of the resistor R3 is connected to the control circuit input terminal and one end of the resistor R4, and the other end of the resistor R4 is connected to the ground terminal.

8. The wide-voltage-input LED drive circuit according to claim 6, wherein the control circuit comprises a comparison circuit and a switch drive circuit, an input end of the switch drive circuit is connected with an output end of the comparison circuit, an output end of the switch drive circuit is connected with a drive signal input end of the LED light effect adjusting circuit, the switch drive circuit comprises a plurality of control switches, and the number of the control switches corresponds to the number of the LED circuits in the LED light effect adjusting circuit.

9. The wide voltage input LED driving circuit according to claim 8, wherein the LED light effect adjusting circuits are packaged in pairs, and the two LED light effect adjusting circuits are packaged to form an IC chip.

10. The LED driving circuit with wide voltage input of claim 6, wherein the voltage input range of the input power supply is 85-305 VAC/VDC.

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