CN103687176A - Linear LED driver circuit using fractional divider to regulate voltage - Google Patents

Abstract

The invention is a linear LED driving circuit that uses a fractional voltage divider to regulate voltage. It includes a power loop composed of a rectifier unit, an LED module and a certain current controller, and a series-parallel circuit connected to the LED module. a series-parallel fractional voltage divider and a voltage-dividing controller connected to the series-parallel fractional voltage divider; and the series-parallel fractional voltage divider includes a voltage-dividing capacitor; and the voltage-dividing capacitor is connected in series to the LED module , during discharge, the voltage dividing capacitor is connected between at least one LED unit of the LED module and a ground terminal; because the voltage on the voltage dividing capacitor is equal to the voltage at both ends of the aforementioned LED unit; therefore, the present invention can be used By setting the number of at least one of the above LED units connected in series to the constant current controller, the voltage value on the voltage dividing capacitor is determined, and the input voltage is reduced to an arbitrary fractional voltage dividing value suitable for the number of LED strings, so that The invention can be applied to different voltages.

Description

Linear LED driver circuit using fractional voltage divider to regulate voltage

technical field

The invention relates to a linear LED driving circuit, in particular to a linear LED driving circuit using a fractional voltage divider to regulate voltage.

Background technique

Alternating current is the most common way of power transmission and distribution on the market at present. The reason is that it is far more efficient to transmit power through AC than through DC. At present, the standard voltage of the AC power sent to each household by the power company is 110 Volts or 220 volts, but in fact the voltage of the AC power received by the user is not as ideal as the above, but there will be a slight error range; generally speaking, the above error range roughly falls within the range of +-10%; For example, if the effective value of the voltage of the AC power is 110 volts, the voltage of the AC power of 99 volts to 122 volts is within the allowable error range.

Light Emitting Diode (LED; Light Emitting Diode) is a common lighting appliance on the market. Compared with traditional incandescent bulbs, it has the characteristics of high luminous efficiency, low power consumption and low pollution; , so it is difficult to use the widely used alternating current; for this reason, the industry has developed a linear LED drive circuit; please refer to Figure 10, the linear LED drive circuit includes:

A rectification unit 50, connected to an AC power supply AC/IN, and converting the AC power supply AC/IN into a pulsating DC power supply;

An LED unit 51 is connected in series with the rectifying unit 50 and includes a plurality of LED light sources; and

A constant current controller 52 is connected in series with the LED unit 51 to form a power circuit; wherein the constant current controller 52 keeps the current flowing through the LED unit 51 constant at a certain value.

It can be seen from the above structure that after the rectification unit 50 of the existing linear LED drive circuit converts the above-mentioned AC power supply AC/IN into a pulsating DC power supply, in order to avoid the instability of the AC power supply AC/IN voltage of the power company, the same product will be caused. produce different brightness; therefore, the existing linear LED driving circuit fixes the current flowing through the LED unit 51 through the constant current controller 52, thereby achieving the purpose of making the LED unit shine stably; therefore, when the above-mentioned AC When the voltage of the power supply drops, the constant current controller 52 reduces the voltage at both ends thereof, and when the voltage of the AC power source AC/IN rises, the constant current controller 52 increases the voltage at both ends; so that the LED unit 51 The voltages at both ends are kept consistent at all times, thereby achieving the effect of fixing the current flowing through the LED unit 51 .

However, since the allowable error range of the voltage of the aforementioned AC power supply AC/IN is 99 volts to 122 volts; therefore, manufacturers of linear LED driving circuits must design different linear LED driving circuits for different voltage ranges, causing manufacturers The cost and storage pressure; therefore, it is necessary to propose a better solution for the above situation.

Contents of the invention

In view of the fact that the above-mentioned existing linear LED driving circuit may be applicable due to the different voltage ranges of the AC power supply; therefore, the main purpose of the present invention is to provide a linear LED driving circuit using a fractional voltage divider to adjust the voltage.

In order to solve the above problems, the present invention discloses a linear LED drive circuit that uses a fractional voltage divider to adjust the voltage, including:

A rectification unit, connected to an AC power source, and converting the AC power source into a pulsating DC power source;

An LED module, the rectifier unit is connected in series, and includes a plurality of LED units connected in series;

A constant current controller is connected in series between the LED module and a ground terminal to form a power circuit; wherein the constant current controller keeps the current flowing through the power circuit constant at a certain value;

A series-parallel fractional voltage divider, connected between the rectifier unit and the LED module, has a series mode and a parallel mode, and includes a voltage dividing capacitor; wherein the series mode makes the voltage dividing capacitor connected in series to the rectifier unit and the LED module, and the parallel mode causes the voltage dividing capacitor to be connected between at least one of the LED units and the ground terminal; and

A voltage divider controller with a built-in voltage safety value connected to the rectifier unit and the series-parallel fractional voltage divider; wherein the voltage divider controller detects the voltage value of the pulsating DC power outputted by the rectifier unit; And when the voltage value of the pulsating DC power supply exceeds the voltage safety value, the series-parallel fractional voltage divider is controlled to be in series mode; otherwise, the series-parallel fractional voltage divider is controlled to be in parallel mode.

In order to solve the above problems, the present invention also discloses a linear LED drive circuit using a fractional voltage divider to adjust the voltage, including:

A rectification unit, connected to an AC power source, and converting the AC power source into a pulsating DC power source;

An LED module, the rectifier unit is connected in series, and includes a plurality of LED units connected in series;

A constant current controller is connected in series between the LED module and a ground terminal to form a power circuit; wherein the constant current controller keeps the current flowing through the power circuit constant at a certain value;

A series-parallel fractional voltage divider, connected between the LED module and the constant current controller, has a series mode and a parallel mode, and includes a voltage dividing capacitor; wherein the series mode is used to make the voltage dividing capacitor series connected between the LED module and the constant current controller, and in the parallel mode, the voltage dividing capacitor is connected between at least one of the LED units and the ground terminal; and

A voltage divider controller with a built-in voltage safety value connected to the rectifier unit and the series-parallel fractional voltage divider; wherein the voltage divider controller detects the voltage value of the pulsating DC power outputted by the rectifier unit; And when the voltage value of the pulsating DC power supply exceeds the voltage safety value, the series-parallel fractional voltage divider is controlled to be in series mode; otherwise, the series-parallel fractional voltage divider is controlled to be in parallel mode.

It can be seen from the above structure that the present invention makes the voltage dividing capacitor partly divide the voltage value of the pulsating DC power supply to the voltage dividing capacitor through the series connection mode, so as to reduce the voltage on both ends of the constant current controller. The parallel mode makes the voltage dividing capacitor discharge at least one LED unit; since the voltage of the voltage dividing capacitor is the same as the voltage of at least one LED unit in the parallel mode; therefore, when the voltage dividing capacitor is connected in series to the LED module again When the above-mentioned pulsating DC power supply is divided partly to the voltage value of the voltage dividing capacitor, it is equal to the voltage of the at least one LED unit; Quantity, and then determine the voltage value on the voltage-dividing capacitor, so that the present invention can be applied to different voltages; and the manufacturer of the aforementioned AC LED drive circuit does not need to design different linear LED drive circuits for different voltage ranges; only need to design The same circuit, and the number of LED units connected in series to the constant current controller can be set according to different requirements, so that the present invention can be applied to the voltage range of different AC power sources; in order to solve the manufacturer's cost and storage pressure.

Description of drawings

FIG. 1 is a circuit diagram of a first embodiment of a linear LED driving circuit using a fractional voltage divider to regulate voltage according to the present invention.

FIG. 2 is a circuit diagram of a second embodiment of the present invention.

FIG. 3 is a circuit diagram of a third embodiment of the present invention.

FIG. 4 is a circuit diagram of a fourth embodiment of the present invention.

FIG. 5 is a circuit diagram of a fifth embodiment of a linear LED driving circuit using a fractional voltage divider to regulate voltage according to the present invention.

FIG. 6 is a circuit diagram of a sixth embodiment of the present invention.

FIG. 7 is a circuit diagram of a seventh embodiment of the present invention.

FIG. 8 is a waveform diagram of the voltage and current of each component of the seventh embodiment of the present invention.

FIG. 9 is a waveform diagram of the pulsating DC voltage of the linear LED driving circuit using a fractional voltage divider to adjust the voltage according to the present invention.

FIG. 10 is a circuit diagram of an existing linear LED driving circuit.

Among them, reference signs:

10 rectifier unit 11 LED module

12 LED unit 13 Constant current controller

14 Voltage-controlled transistor 15 Current detection unit

16 Steady current control unit 17 Low frequency filter

20 series-parallel fractional voltage divider 21 voltage dividing capacitor

22 Control diode 23 Selector switch

24 Switching diode 25 Storage capacitor

26 Ground diode 30 Voltage divider controller

31 Multiplexer 40 Serial-parallel fractional voltage divider

41 Divider capacitor 42 Control diode

43 Selector switch 44 Switching diode

45 bypass transistor 46 bypass resistor

47 Select diode 50 Rectifier unit

51 LED unit 52 Constant current controller

Detailed ways

Please refer to FIG. 1, which is the first embodiment of the linear LED driving circuit using a fractional voltage divider to adjust the voltage according to the present invention, including:

A rectification unit 10, connected to an AC power supply AC/IN, and converting the above-mentioned AC power supply AC/IN into a pulsating DC power supply; in this embodiment, the rectification unit 10 is a full-wave rectifier;

An LED module 11 is connected in series with the rectifier unit 10 and includes a plurality of LED units 12 connected in series; in this embodiment, the above-mentioned LED module 11 includes two LED units 12, and each LED unit 12 includes multiple LED units light source;

A constant current controller 13 is connected in series between the LED module 11 and a ground terminal to form a power circuit; wherein the constant current controller 13 makes the current flowing through the power circuit fixed at a certain value; in this embodiment The constant current controller 13 includes a voltage control transistor 14, a current detection unit 15 connected in series with the voltage control transistor 14, and a constant current control unit 16 electrically connected to the voltage control transistor 14 and the current detection unit 15; Wherein the voltage-controlled transistor 14 and the current detection unit 15 are connected in series to the LED module 11 to form the above-mentioned power circuit; The detected current signal is transmitted to the steady current control unit 16; and the steady current control unit 16 controls the current flowing through the power loop through the voltage control transistor 14 according to the above current signal to maintain the current stability of the power loop;

A series-parallel fractional voltage divider 20, connected between the rectifier unit 10 and the LED module 11, has a series mode and a parallel mode, and includes a voltage dividing capacitor 21; wherein the series mode makes the voltage dividing capacitor 21 It is connected in series between the rectifier unit 10 and the LED module 11, and the parallel mode makes the voltage dividing capacitor 21 connected between at least one of the LED units 12 and the ground terminal; in this embodiment, the voltage dividing The capacitor 21 has a positive terminal and a negative terminal; and the series-parallel fractional voltage divider 20 further includes a control diode 22, a selection switch 23 and a switch diode 24, wherein:

The control diode 22 is connected in series to the voltage dividing capacitor 21, and includes an anode and a cathode; wherein the anode of the control diode 22 is connected to the negative terminal of the voltage dividing capacitor 21;

One end of the selector switch 23 is connected to the rectifying unit 10, and the other end is connected between the two LED units 12;

The switching diode 24 includes an anode and a cathode, and its cathode is connected between the voltage dividing capacitor 21 and the control diode 22, and its anode is connected to the ground terminal; and

A voltage divider controller 30 has a built-in voltage safety value VF, and is connected to the rectifier unit 10 and the series-parallel fractional voltage divider 20; wherein the voltage divider controller 30 detects the pulsation output by the rectifier unit 10 The voltage value Vdc of the DC power supply; and when the voltage value Vdc of the pulsating DC power supply exceeds the voltage safety value VF, the series-parallel fractional voltage divider 20 is controlled to be in series mode; otherwise, the series-parallel fractional voltage divider is controlled to The device 20 is in parallel mode; please refer to FIG. 1, in this embodiment, the voltage divider controller 30 is connected to the selection switch 23, and when the voltage value Vdc of the above-mentioned pulsating DC power supply is greater than the voltage safety value VF, The selection switch 23 is controlled to be in an off state, otherwise it is in an on state.

It can be known from the above structure that in the first embodiment of the present invention, the voltage divider controller 30 detects the voltage value Vdc of the pulsating DC power outputted by the rectification unit 10, and then determines whether the series-parallel fractional voltage divider 20 is in series mode or in series mode. Parallel mode: when the series-parallel fractional voltage divider 20 is in series mode, the voltage dividing capacitor 21 is connected in series to the LED module 11, so that the voltage value Vdc of the above-mentioned pulsating DC power supply is divided to the divided voltage Capacitor 21, to reduce the voltage on both ends of the constant current controller 13, and at the same time charge the voltage dividing capacitor 21; moreover, when the series-parallel fractional voltage divider 20 is in parallel mode, make The voltage dividing capacitor 21 is connected between at least one of the LED units 12 and the ground terminal, and the voltage dividing capacitor 21 discharges the at least one LED unit to provide a stable current.

Since the voltage of the voltage dividing capacitor 21 in the parallel mode is the same as the voltage of at least one LED unit 12; therefore, when the voltage dividing capacitor 21 is connected in series to the LED module 20 again, a part of the voltage of the pulsating DC power supply will be divided. The voltage value assigned to the voltage dividing capacitor 21 is equal to the voltage of at least one LED unit 12; therefore, the present invention can determine the divided voltage by setting the number of LED units 12 connected to the voltage dividing capacitor 21. The voltage value on the piezocapacitor 21 makes the present invention applicable to different voltages.

Please refer to FIG. 2, which is the second embodiment of the present invention, its structure is roughly the same as that of the first embodiment; the difference is that in this embodiment, the above-mentioned LED module 11 includes three LED units 12; and the use of fractional voltage division to adjust the voltage of the linear LED drive circuit further includes:

A multiplexer 31, connected to the voltage divider controller 30, and connected in series between the selection switch 23 and the LED module 11; wherein the multiplexer 31 is connected between each LED unit 12, and through the divider Controlled by the voltage controller 30, the selector switch 23 is selectively connected between the two LED units 12.

In the second embodiment, a multiplexer 31 is further connected in series between the selection switch 23 and each LED unit 12; therefore, the present invention can be selectively connected to any two LED units 12 through the multiplexer 31. Therefore, the user can set the number of LED units 12 connected to the voltage-dividing capacitor 21 by switching the multiplexer 31, and then determine the voltage value on the voltage-dividing capacitor 21.

Please refer to FIG. 3, which is a third preferred embodiment of the present invention, its structure is roughly the same as that of the first embodiment; the difference is that the linear LED drive circuit using a fractional voltage divider to adjust voltage further includes:

A storage capacitor 25, one end of which is connected between the switching switch 23 and the LED module 11, and the other end is connected to the anode of the switching diode 24; and

A grounding diode 26 includes an anode and a cathode, and its cathode is connected between the storage capacitor 25 and the switching diode 24, and its anode is connected to a ground terminal; wherein the switching diode 24 is further connected through the grounding diode 26 to this ground.

It can be seen from the above structure that when the series-parallel fractional voltage divider 20 is in the parallel mode, in addition to connecting the voltage dividing capacitor 21 between at least one of the LED units 12 and the ground terminal, simultaneously connecting the voltage dividing capacitor 21 and the The storage capacitor 25 is connected in parallel; so that when the voltage dividing capacitor 21 is discharging, the storage capacitor 25 can charge it at the same time, and when the voltage dividing capacitor 21 is charging, the storage capacitor 25 can charge at least one LED unit 12 After discharge, the current flowing through the at least one LED unit is more stable.

Please refer to Figure 4, which is the fourth embodiment of the present invention, its structure is roughly the same as that of the first embodiment; the difference is that in this embodiment, the above-mentioned LED module 11 includes three LED units 12; A voltage regulator to adjust the voltage of the linear LED drive circuit further includes:

A multiplexer 31, connected to the voltage divider controller 30, and connected in series between the selection switch 23 and the LED module 11; wherein the multiplexer 31 is connected between each LED unit 12, and through the divider The control 30 of the voltage controller makes the selection switch 23 selectively connected between the two LED units 12;

A storage capacitor 25, one end of which is connected between the switching switch 23 and the multiplexer 31, and the other end is connected to the anode of the switching diode 24; and

A grounding diode 26 , its cathode is connected between the storage capacitor 25 and the switching diode 24 , and its anode is connected to a grounding terminal; wherein the switching diode 24 is further connected to the grounding terminal through the grounding diode 26 .

As can be seen from the above structure, the fourth embodiment combines the features of the aforementioned two embodiments, not only can the switching of the multiplexer 31 be used to further determine the voltage value on the voltage dividing capacitor 21; Provide more stable current.

Please refer to FIG. 5, which is a fifth embodiment of a linear LED driving circuit using a fractional voltage divider to regulate voltage according to the present invention, including:

A rectification unit 10 is connected to an AC power supply AC/IN, and converts the above-mentioned AC power supply AC/IN into a pulsating DC power supply; in this embodiment, the rectification unit 10 is a full-wave rectifier

An LED module 11, connected in series with the rectifier unit 10, and includes a plurality of LED units 12; in this embodiment, the LED module 11 includes two LED units 12, and each LED unit 12 includes multiple LED light sources;

A constant current controller 13 is connected in series between the LED module 11 and a ground terminal to form a power circuit; wherein the constant current controller 13 makes the current flowing through the power circuit fixed at a certain value; in this embodiment The constant current controller 13 includes a voltage control transistor 14, a current detection unit 15 connected in series with the voltage control transistor 14, and a constant current control unit 16 electrically connected to the voltage control transistor 14 and the current detection unit 15; Wherein the voltage-controlled transistor 14 and the current detection unit 15 are connected in series to the LED module 11, and constitute the above-mentioned power circuit: and the current detection unit 15 detects the current flowing through the power circuit, and passes through a low-frequency filter 17 to convert the The detected current signal is transmitted to the steady current control unit 16; and the steady current control unit 16 controls the current flowing through the power loop through the voltage control transistor 14 according to the above current signal to maintain the current stability of the power loop;

A series-parallel fractional voltage divider 40 is connected between the LED module 11 and the constant current controller 13, and has a series mode and a parallel mode, and includes a voltage dividing capacitor 41; wherein the series mode makes the voltage division The capacitor 41 is connected in series between the LED module 11 and the constant current controller 13, and the parallel mode makes the voltage dividing capacitor 41 connected between at least one LED unit 12 and the ground terminal; in this embodiment , the voltage dividing capacitor 41 has a positive terminal and a negative terminal; and the series-parallel fractional voltage divider 40 further includes a control diode 42, a selection switch 43, a switching diode 44, a bypass transistor 45 and a bypass resistor 46 ,in:

The control diode 42 is connected in series to the voltage dividing capacitor 41, and includes an anode and a cathode; wherein the cathode of the control diode 43 is connected to the positive terminal of the voltage dividing capacitor 41;

One end of the selection switch 43 is connected between the control diode 42 and the voltage dividing capacitor 41, and the other end is connected between the two LED units 12;

The switching diode 44 includes an anode and a cathode, and its cathode is connected to the negative terminal of the voltage dividing capacitor 21, and its anode is connected to a ground terminal;

The bypass transistor 45 is connected to the anode of the control diode 42 and includes a control terminal Vg;

One end of the bypass resistor 46 is connected in series to the bypass transistor 45, and the other end is connected to the ground terminal; and

A voltage divider controller 30 has a built-in voltage safety value VF, and is connected to the rectifier unit 10 and the series-parallel fractional voltage divider 40; wherein the voltage divider controller 30 detects the pulsation output by the rectifier unit 10 The voltage value Vdc of the DC power supply; and when the voltage value Vdc of the above-mentioned pulsating DC power supply exceeds the voltage safety value VF, the series-parallel fractional voltage divider is controlled to be in series mode; otherwise, the series-parallel fractional voltage divider is controlled It is a parallel mode; in this embodiment, the voltage divider controller 30 is connected to the control terminal of the selection switch 43 and the bypass transistor 45, and when the voltage value Vdc of the above-mentioned pulsating DC power supply is greater than the voltage safety value VF, The selection switch 43 and the bypass transistor 45 are controlled to be in an off state, otherwise they are in an on state.

It can be seen from the above structure that when the series-parallel fractional voltage divider 40 is in series mode in the fifth embodiment of the present invention, since the voltage dividing capacitor 41 is connected in series between the LED module 11 and the constant current controller 13 Therefore, the same as the first embodiment of the present invention, the voltage value Vdc of the pulsating DC power supply is divided into a part of the voltage dividing capacitor 41; and when the series-parallel fractional voltage divider 20 is in parallel mode, make The voltage dividing capacitor 41 is connected between at least one LED unit 12 and the ground terminal, and the voltage dividing capacitor 41 is discharged to provide a stable current to the at least one LED unit 12; wherein, the voltage dividing capacitor The discharge path of 41 passes through the selection switch 43 , the at least one LED unit 12 , the bypass transistor 45 , the bypass resistor 46 and the switch diode 44 .

And when the above-mentioned serial-parallel fractional voltage divider 40 enters the series mode again, because the voltage-dividing capacitor 41 discharges at least one LED unit 12, the voltage at both ends of the voltage-dividing capacitor 41 is the same as that of the first LED unit 12 of the present invention. The embodiment is equal to the voltage value obtained by dividing part of the pulsating DC power supply to the voltage dividing capacitor 21; therefore, in the fifth embodiment, the user can also set the above-mentioned connection with the voltage dividing capacitor 41. The number of LED units 12 determines the voltage value on the voltage dividing capacitor 21 .

Please refer to FIG. 6, which is a preferred sixth embodiment of the present invention, its structure is roughly the same as that of the fifth embodiment; the difference is that in this embodiment, the above-mentioned LED module 11 includes three LED units 12; and the use The fractional voltage divider to adjust the voltage of the linear LED driver circuit further includes:

A multiplexer 31, connected to the voltage divider controller 30, and connected in series between the selection switch 43 and the LED module 11; wherein the multiplexer 31 is connected between each LED unit 12, and through the divider The selection switch 43 is selectively connected between the two LED units 12 under the control of the voltage controller 30 .

It can be seen from the above structure that the principle of the preferred sixth embodiment of the present invention is the same as that of the above-mentioned second embodiment, and the number of the above-mentioned LED units 12 connected to the voltage dividing capacitor 41 is set through the switching of the multiplexer 31. Further, the voltage value on the voltage dividing capacitor 21 is determined.

Please refer to Fig. 7, which is the seventh embodiment of the present invention, its structure is roughly the same as that of the fifth embodiment; the difference is that the selection switch 43 is a selection diode 47, and the selection diode 47 includes an anode and A cathode; the anode of the selection diode 47 is connected between the control diode 42 and the voltage dividing capacitor 41 , and the cathode is connected between the two LED units 12 .

Please refer to Fig. 7 and Fig. 8, let the above-mentioned AC power supply AC/IN have an effective voltage value of 110 volts (peak value is 156 volts), and let the voltage safety value VF be 120 volts, and let the above-mentioned and voltage dividing capacitor The cut-in voltage VLED2 of the LED unit 12 connected to 41 is 20 volts, and the cut-in voltage VLED1 of the remaining LED units 12 is 100 volts; The cut-in voltage VLED2 of the LED unit 12 is 20 volts.

Therefore, when the maximum peak voltage 156 volts of the AC power supply AC/IN exceeds the voltage safety value VF (120) volts, the series-parallel fractional voltage divider 40 is in series mode; and the above-mentioned LED connected to the voltage dividing capacitor 41 The unit 12 bears a voltage of 20 volts, and the other LED units 12 bear a voltage of 100 volts, and the voltage dividing capacitor 21 bears a voltage of 20 volts and keeps charging, while the constant current controller 13 bears the remaining 19 volts.

Please combine and refer to shown in Figure 9, and because the voltage Vt (20 volts) of the above-mentioned voltage-dividing capacitor 41 is equal to the cut-in voltage (20 volts) of the LED unit 12 connected to the voltage-dividing capacitor 41; therefore, the voltage-dividing capacitor 41 The withstand voltage (20 volts) accounts for one-sixth of the cut-in voltage (120 volts) of all LED units 12 in the LED module 11, so we can call such a type a circuit except for 1.16; and the present invention bears The voltage (1+X) VF is raised to the cut-in voltage (120 volts) of all LED units 12 plus the voltage (20 volts) borne by the voltage dividing capacitor 41, wherein the above-mentioned X is the cut-in voltage of all LED units 12 The voltage (120 volts) is divided by the voltage (20 volts) withstood by the voltage dividing capacitor 41 , and the value is 0.16.

To sum up the above, because the present invention can determine the voltage value on the voltage dividing capacitor 21 by setting the number of LED units 12 connected to the voltage dividing capacitor 21, 41, so that the present invention can be applied to different voltages Therefore, the manufacturer of the AC LED drive circuit only needs to design an identical circuit, and set the quantity of the above-mentioned LED units 12 connected with the voltage dividing capacitors 21, 41 according to different requirements, so that the present invention can be applied to different AC The voltage range of the power supply; to solve the manufacturer's cost and storage pressure.

Claims (11)

1. use mark voltage divider with a linear LED drive circuit for regulation voltage, it is characterized in that, include:

One rectification unit, is connected to an AC power, and above-mentioned AC power is converted to a Voltage pulsating direct-current supply;

One LED module, is connected in series this rectification unit, and includes a plurality of LED unit;

Certain current controller, is connected in series between this LED module and an earth terminal, and forms an electric power loop; Wherein this is determined the flow through electric current of this electric power loop of current controller order and is fixed as certain value;

One series-parallel mark voltage divider, is connected between this rectification unit and this LED module, and has series model and paralleling model, and includes a dividing potential drop electric capacity; Wherein this series model is for making this dividing potential drop capacitance series between this rectification unit and this LED module, and this paralleling model is for making this dividing potential drop electric capacity be connected to wherein between at least one LED unit and this earth terminal; And

One minute pressure controller, inside has a voltage safety value, and is connected to this rectification unit and this series-parallel mark voltage divider; The magnitude of voltage of the Voltage pulsating direct-current supply that wherein this minute pressure controller exported for detection of this rectification unit; And when the magnitude of voltage of above-mentioned Voltage pulsating direct-current supply surpasses this voltage safety value, controlling this series-parallel mark voltage divider is series model; Otherwise controlling this series-parallel mark voltage divider is paralleling model.

2. use mark voltage divider as claimed in claim 1, with the linear LED drive circuit of regulation voltage, is characterized in that:

This its dividing potential drop electric capacity of series-parallel mark voltage divider has anode and negative terminal, and further includes:

One controls diode, is connected in series to this dividing potential drop electric capacity, and includes an anode and a negative electrode; Wherein this controls the anodic bonding of diode to the negative terminal of this dividing potential drop electric capacity;

One selector switch, its one end is connected to this rectification unit, and the other end is connected to wherein between two LED unit; And

One switching diode, includes an anode and a negative electrode, and its negative electrode is connected between this dividing potential drop electric capacity and this control diode, and its anodic bonding is to this earth terminal again;

And this minute pressure controller is connected to this selector switch, and when the magnitude of voltage of above-mentioned Voltage pulsating direct-current supply is greater than voltage safety value, controls this selector switch and present cut-off state, otherwise present conducting state.

3. use mark voltage divider as claimed in claim 2, with the linear LED drive circuit of regulation voltage, is characterized in that, further includes:

One multiplexer, is connected to this minute pressure controller, and is serially connected with between this selector switch and this LED module; Wherein this multiplexer is connected between each LED unit, and by the control of this minute pressure controller, this selector switch is optionally connected to wherein between two LED unit.

4. use mark voltage divider as claimed in claim 2, with the linear LED drive circuit of regulation voltage, is characterized in that, further includes:

One storage capacitors, its one end is connected between this diverter switch and this LED module, the other end be connected to this switching diode positive utmost point ﹔ and

One ground connection diode, includes an anode and a negative electrode, and its negative electrode is connected between this storage capacitors and this switching diode, again its anodic bonding to one earth terminal; Wherein this switching diode is by this ground connection diode and then be connected to this earth terminal.

5. use mark voltage divider as claimed in claim 2, with the linear LED drive circuit of regulation voltage, is characterized in that, further includes:

One multiplexer, is connected to this minute pressure controller, and is serially connected with between this selector switch and this LED module; Wherein this multiplexer is connected between each LED unit, and by the control of this minute pressure controller, this selector switch is optionally connected to wherein between two LED unit;

One storage capacitors, its one end is connected between this diverter switch and this multiplexer, the other end be connected to this switching diode positive utmost point ﹔ and

One ground connection diode, its negative electrode is connected between this storage capacitors and this switching diode, again its anodic bonding to one earth terminal; Wherein this switching diode is by this ground connection diode and then be connected to this earth terminal.

6. as the linear LED drive circuit of the use mark voltage divider as described in arbitrary in claim 1 to 5 with regulation voltage, it is characterized in that, this is determined current controller and includes:

One voltage-controlled transistor, is connected in series to this LED unit, and forms an electric power loop;

One current detecting unit, is connected in series this voltage-controlled transistor; And the electric current of this electric power loop of flowing through detects in this current detecting unit system; And

One current stabilization control unit, is electrically connected to this voltage-controlled transistor and this current detecting unit, and reads the detected current signal of this current detecting unit by a low-frequency filter; Wherein this current stabilization control unit according to above-mentioned current signal by the flow through electric current of this electric power loop of this voltage-controlled transistor and then adjustment.

7. use mark voltage divider with a linear LED drive circuit for regulation voltage, it is characterized in that, comprise a rectification unit, be connected to an AC power, and above-mentioned AC power is converted to a Voltage pulsating direct-current supply;

One LED module, is connected in series this rectification unit, and includes a plurality of LED unit;

Certain current controller, is connected in series between this LED module and an earth terminal, and forms an electric power loop; Wherein this is determined the flow through electric current of this electric power loop of current controller order and is fixed as certain value;

One series-parallel mark voltage divider, is connected to this LED module and this is determined between current controller, and has series model and paralleling model, and includes a dividing potential drop electric capacity; Wherein this series model system makes this dividing potential drop capacitance series determine between current controller in this LED module and this, and this paralleling model makes this dividing potential drop electric capacity be connected to wherein between at least one LED unit and this earth terminal; And

One minute pressure controller, inside has a voltage safety value, and is connected to this rectification unit and this series-parallel mark voltage divider; Wherein this minute pressure controller detects the magnitude of voltage of the Voltage pulsating direct-current supply that this rectification unit exports; And when the magnitude of voltage of above-mentioned Voltage pulsating direct-current supply surpasses this voltage safety value, controlling this series-parallel mark voltage divider is series model; Otherwise controlling this series-parallel mark voltage divider is paralleling model.

8. use mark voltage divider as claimed in claim 7, with the linear LED drive circuit of regulation voltage, is characterized in that, this its dividing potential drop electric capacity of series-parallel mark voltage divider has anode and negative terminal, and further comprises:

One controls diode, is connected in series to this dividing potential drop electric capacity, and includes an anode and a negative electrode; Wherein the negative electrode of this control diode is connected to the anode of this dividing potential drop electric capacity;

One selector switch, its one end is connected between this control diode and this dividing potential drop electric capacity, and the other end is connected to wherein between two LED unit;

One switching diode, includes an anode and a negative electrode, and its negative electrode is connected to the negative terminal of this dividing potential drop electric capacity, again its anodic bonding to one earth terminal;

One pass-transistor, is connected to the anode of this control diode, and includes a control end; And

One bypass resistance, its one end serial connection is to this pass-transistor, and the other end is connected to this earth terminal;

And this minute pressure controller is connected to the control end of this selector switch and this pass-transistor, and when the magnitude of voltage of above-mentioned Voltage pulsating direct-current supply is greater than voltage safety value, controls this selector switch and this pass-transistor and present cut-off state, otherwise present conducting state.

9. use mark voltage divider as claimed in claim 8, with the linear LED drive circuit of regulation voltage, is characterized in that, further includes:

One multiplexer, is connected to this minute pressure controller, and is serially connected with between this selector switch and this LED module; Wherein this multiplexer is connected between each LED unit, and by the control of this minute pressure controller, this selector switch is optionally connected to wherein between two LED unit.

10. use mark voltage divider as claimed in claim 8, with the linear LED drive circuit of regulation voltage, is characterized in that, this selector switch is a selection diode, and this selection diode includes an anode and a negative electrode; Wherein this is selected between this control diode of its anodic bonding of diode and this dividing potential drop electric capacity, and its negative electrode is connected to wherein between two LED unit.

11. as the linear LED drive circuit of the use mark voltage divider as described in arbitrary in claim 7 to 10 with regulation voltage, it is characterized in that, this determines current controller, includes:

One voltage-controlled transistor, is connected in series to this LED unit, and forms an electric power loop;

One current detecting unit, is connected in series this voltage-controlled transistor; And this current detecting unit detects the electric current of this electric power loop of flowing through; And

One current stabilization control unit, is electrically connected to this voltage-controlled transistor and this current detecting unit, and reads the detected current signal of this current detecting unit by a low-frequency filter; Wherein this current stabilization control unit according to above-mentioned current signal by the flow through electric current of this electric power loop of this voltage-controlled transistor and then adjustment.

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