TW201414349A - Linear LED driving circuit using a fractional voltage divider to regulate voltage - Google Patents

Abstract

The present invention is a linear LED driving circuit using a fractional voltage divider to regulate voltage, which comprises: a power loop composed of a regulating unit, an LED module and a constant-current controller; a series-parallel fractional voltage divider connected to the LED module; and a voltage-division controller connected to the series-parallel fractional voltage divider. Furthermore, the series-parallel fractional voltage divider includes a voltage-division capacitor connected with the LED module in series. When discharging electricity, the voltage-division capacitor is connected in between at least one LED unit of the LED module and a grounding end. Since the voltage of the voltage-division capacitor is equivalent to the voltage of the two ends of the aforementioned LED unit, therefore the present invention can set the number of LED units serially connected to the at least one constant-current controller to determine the voltage value of the voltage-division capacitor, so as to lower the input voltage down to an arbitrary fractional voltage-division value appropriate for an LED series number. Accordingly, the present invention is applicable to different voltages.

Description

Linear LED driver circuit using a fractional divider to regulate voltage

The present invention is a linear LED driving circuit, and more particularly a linear LED driving circuit that uses a fractional voltage divider to regulate voltage.

The AC power system is currently the most common power transmission and distribution method on the market. The reason is that it is much more efficient to transmit power through AC transmission than to transmit power through DC. The current voltage of the AC power supply sent by the power company to each household is 110 volts or 220 volts, but in fact the voltage of the AC power received by the user is not as ideal as above, but there is a slight error range; in general, the above error range falls roughly within the range of ±10%; For example, if the effective value of the voltage of the AC power source is 110 volts, the voltage of the AC power source of 99 volts to 122 volts is an allowable error range.

Light Emitting Diode (LED) is a common lighting appliance currently on the market, which has higher luminous efficiency, low power consumption and low pollution compared with traditional incandescent bulbs; however, due to the LED itself It can only be used in a single pass, so it is difficult to use the AC power that is widely used at present; for this reason, the industry has developed a linear LED drive circuit; as shown in FIG. 10, the linear LED drive circuit includes: a rectification unit 50, is connected to an AC power supply AC / IN, and converts the AC power supply AC / IN into a pulsed DC power supply; an LED unit 51 is connected in series with the rectifier unit 50, and includes a plurality of LED light sources; The constant current controller 52 is connected in series with the LED unit 51 and constitutes a power supply circuit; wherein the constant current controller 52 fixes the current flowing through the LED unit 51 to a certain value.

It can be seen from the above structure that the existing linear LED driving circuit causes the same product after the rectifying unit 50 converts the AC power source AC/IN into a pulsating DC power source, in order to avoid instability of the AC power source AC/IN voltage of the power company. Different brightness is generated; that is, 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 stable and bright; therefore, when the above-mentioned alternating current When the voltage of the power source drops, the constant current controller 52 reduces the voltage across the two ends, and when the voltage of the AC power source AC/IN rises, the constant current controller 52 increases the voltage across the two ends; 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 voltage of the aforementioned AC power supply AC/IN can tolerate an error range of 99 volts to 122 volts; therefore, linear LED driver circuit manufacturers must design different linear LED driver circuits for different voltage ranges, thereby causing manufacturing. The cost of the business and the storage pressure; therefore, it is necessary to propose a better solution to the above situation.

In view of the above-mentioned existing linear LED driving circuit, there is a problem in that the voltage range of the AC power source is different; therefore, the main object of the present invention is to provide a linear LED driving circuit using a fractional voltage divider to adjust the voltage.

The first main technical means used to achieve the above purpose is to use the fractional voltage divider to adjust the voltage of the linear LED driving circuit, comprising: a rectifying unit connected to an AC power source, and the above AC power source Converting to a pulsating DC power supply; an LED module is connected in series with the rectifying unit, and includes a plurality of LED units connected in series; a certain current controller is connected between the LED module and a ground end, and Forming a power supply circuit; wherein the constant current controller fixes a current flowing through the power supply circuit to a certain value; a series of parallel-type fractional voltage dividers is connected between the rectifying unit and the LED module, and has The series mode and the parallel mode include a voltage dividing capacitor; wherein the series mode is configured to connect the voltage dividing capacitor between the rectifying unit and the LED module, and the parallel mode connects the voltage dividing capacitor Between at least one LED unit and the ground terminal; and a voltage dividing controller having a built-in voltage safety value and connected to the rectifying unit and the serial-parallel fractional voltage divider; wherein the voltage dividing controller is detecting Measurement The voltage value of the pulsating DC power source output by the rectifying unit; and when the voltage value of the pulsating DC power source exceeds the voltage safety value, the serial-type fractional voltage divider is controlled to be in series mode; otherwise, the serial-parameter fraction is controlled The pressure device is in parallel mode.

The second main technical means used to achieve the above purpose is to use the fractional voltage divider to adjust the voltage of the linear LED driving circuit, which comprises: a rectifying unit connected to an alternating current power source and the alternating current power source Converted into a pulsating DC power supply; an LED module is connected in series with the rectifying unit and includes a plurality of strings Connected LED unit; a certain current controller is connected between the LED module and a ground terminal, and constitutes a power circuit; wherein the constant current controller fixes a current flowing through the power circuit to a certain value; a series of parallel fractional voltage dividers connected between the LED module and the constant current controller, and having a series mode and a parallel mode, and including a voltage dividing capacitor; wherein the series mode is the voltage dividing capacitor Connected between the LED module and the constant current controller, and the parallel mode connects the voltage dividing capacitor to at least one of the LED units and the ground; and a voltage dividing controller is built in a voltage safety value connected to the rectifying unit and the serial-parallel fractional voltage divider; wherein the voltage dividing controller detects a voltage value of the pulsating DC power source output by the rectifying unit; and when the pulsating DC power source is If the voltage value exceeds the voltage safety value, the serial-type fractional voltage divider is controlled to be in series mode; otherwise, the serial-parallel fractional voltage divider is controlled to be in parallel mode.

According to the above structure, the present invention transmits the voltage value of the pulsating DC power supply to a portion of the voltage dividing capacitor through the series mode to reduce the voltage across the constant current controller. And discharging the voltage dividing capacitor to the at least one LED unit through the parallel mode; since the voltage dividing capacitor is in the parallel mode, the voltage is the same as the voltage of the at least one LED unit; therefore, when the voltage dividing capacitor is connected again to the In the LED module, the voltage value of the pulsating DC power supply to the voltage dividing capacitor is equal to the voltage of the at least one LED unit; therefore, the present invention can be configured by connecting the above-mentioned voltage dividing capacitor. The number of LED units, which in turn determines the voltage value across the voltage dividing capacitor, to enable the invention to be applied to different voltages; Manufacturers of AC LED driver circuits do not need to design different linear LED driver circuits for different voltage ranges; only one identical circuit needs to be designed, and the number of LED units connected to the constant current controller is set according to different requirements. The invention can be applied to the voltage range of different AC power sources; thereby solving the cost of the manufacturer and the storage pressure.

Referring to FIG. 1 , a first embodiment of a linear LED driving circuit using a fractional voltage divider to adjust a voltage according to the present invention includes: a rectifying unit 10 connected to an AC power source AC/IN, and The AC power supply AC/IN is converted into a pulsating DC power supply. In the embodiment, the rectifying unit 10 is a full-wave rectifier; an LED module 11 is connected in series with the rectifying unit 10 and includes a plurality of The LED unit 12 is connected in series. In the embodiment, the LED module 11 includes two LED units 12, and each LED unit 12 includes a plurality of LED light sources; a certain current controller 13 is connected to the LED module. Between the group 11 and a ground, and constitute a power circuit; wherein the constant current controller 13 is to fix the current flowing through the power circuit to a certain value; in the embodiment, the constant current controller 13 includes a voltage-controlled transistor 14, a current detecting unit 15 connected in series with the voltage-controlled transistor 14, and a steady-current control unit 16 electrically connected to the voltage-controlled transistor 14 and the current detecting unit 15; wherein the voltage The control transistor 14 and the current detecting unit 15 are connected in series to the LED The group 11 is configured to form the power supply loop; and the current detecting unit 15 detects the current flowing through the power loop, and transmits the detected current signal to the steady current control unit 16 through a low frequency filter 17. And the steady current control unit 16 is configured to control the current flowing through the power circuit through the voltage control transistor 14 according to the current signal to maintain the current stability of the power circuit; a series of parallel fractional voltage dividers 20 Connected to the rectifying unit 10 and the LED module 11, and has a series mode and a parallel mode, and includes a voltage dividing capacitor 21; wherein the series mode is configured to connect the voltage dividing capacitor 21 to the rectifying unit 10 and Between the LED modules 11 and the parallel mode, the voltage dividing capacitor 21 is connected between the at least one LED unit 12 and the ground. In this embodiment, the voltage dividing capacitor 21 has a positive terminal and The series-connected fractional voltage divider 20 further includes a control diode 22, a selection switch 23 and a switching diode 24, wherein the control diode 22 is connected in series to the branch a capacitor 21 and including an anode and a cathode The anode of the control diode 22 is connected to the negative terminal of the voltage dividing capacitor 21; one end of the selection switch 23 is connected to the rectifying unit 10, and the other end is connected between the two LED units 12 The switch diode 24 includes an anode and a cathode, and a cathode is connected between the voltage dividing capacitor 21 and the control diode 22, and an anode is connected to the ground; and a partial pressure The controller 30 has a built-in voltage safety value V _F and is connected to the rectifying unit 10 and the serial-parallel fractional voltage divider 20; wherein the voltage dividing controller 30 detects the pulsation outputted by the rectifying unit 10 DC voltage value V _dc power supply; and when the above voltage value V _dc pulsed DC power exceeds the safe voltage value V _F of the series and parallel train control score line mode voltage divider 20; otherwise, the control of the series and parallel score The voltage divider 20 is in a parallel mode; as shown in FIG. 1 , in the embodiment, the voltage dividing controller 30 is connected to the selection switch 23, and when the voltage value V _{dc of} the pulsating DC power source is greater than the voltage safety value when V _F, line 23 controls the selector switch rendered oFF state Otherwise rendered conductive state.

According to the above configuration, the first embodiment of the present invention detects the voltage value V _dc of the pulsating DC power output from the rectifying unit 10 through the voltage dividing controller 30, and further determines that the serial-parallel fractional voltage divider 20 is In the series mode or the parallel mode; when the series-parallel fractional voltage divider 20 is in the series mode, the voltage dividing capacitor 21 is connected in series to the LED module 11, so that the voltage value V _dc of the pulsating DC power source is divided. a portion of the voltage dividing capacitor 21 is applied to lower the voltage across the constant current controller 13, and at the same time, the voltage dividing capacitor 21 is charged; further, when the string type fractional voltage divider When 20 is in the parallel mode, the voltage dividing capacitor 21 is connected between at least one of the LED units 12 and the ground, and the voltage dividing capacitor 21 is discharged to the at least one LED unit to provide a stable current.

The voltage of the voltage dividing capacitor 21 is the same as the voltage of the at least one LED unit 12 when the voltage dividing capacitor 21 is in the parallel mode; therefore, when the voltage dividing capacitor 21 is connected in series to the LED module 20, the pulsed DC power supply is divided by one. The voltage value of the portion of the voltage dividing capacitor 21 is equal to the voltage of the at least one LED unit 12; therefore, the present invention can determine the number by setting the number of the LED units 12 connected to the voltage dividing capacitor 21. The voltage values on the capacitor 21 are applied to enable the invention to be applied to different voltages.

Referring to FIG. 2, it is a second embodiment of the present invention, and its structure is substantially the same as that of the first embodiment; however, the difference is that in the embodiment, the LED module 11 includes three LED units 12; Use score The linear LED driving circuit for adjusting the voltage further includes: a multiplexer 31 connected to the voltage dividing controller 30 and connected in series between the selecting switch 23 and the LED module 11; The multiplexer 31 is connected between the respective LED units 12, and is selectively connected to the two of the LED units 12 by the control of the voltage dividing controller 30.

Since the second embodiment is further connected with a multiplexer 31 between the selection switch 23 and each of the LED units 12, the present invention can be selectively connected to any two LED units through the multiplexer 31. Therefore, the user can set the number of the LED units 12 connected to the voltage dividing capacitor 21 by the switching of the multiplexer 31, and further determine the voltage value of the voltage dividing capacitor 21.

Referring to FIG. 3, it is a third preferred embodiment of the present invention, and its structure is substantially the same as that of the first embodiment; however, the difference is that the linear LED driving circuit using the fractional voltage divider to adjust the voltage is used. The method further includes: a storage capacitor 25, one end of which is connected between the switch 23 and the LED module 11, and the other end is connected to the anode of the switch diode 24; and a grounding diode 26, The system includes an anode and a cathode, and a cathode is connected between the storage capacitor 25 and the switch diode 24, and an anode is connected to a ground. The switch diode 24 is transmitted through the ground. The pole body 26 is in turn connected to the ground.

It can be seen from the above structure that when the series-parallel fractional voltage divider 20 is in the parallel mode, except that the voltage dividing capacitor 21 is connected between at least one of the LED units 12 and the ground terminal, the voltage dividing capacitor 21 is simultaneously The storage capacitor 25 parallel; so that when the voltage dividing capacitor 21 is discharged, the storage capacitor 25 can simultaneously charge it, and when the voltage dividing capacitor 21 is charged, the storage capacitor 25 performs at least one LED unit 12 The current flowing through the at least one LED unit is more stable.

The fourth embodiment of the present invention is substantially the same as the first embodiment; the difference is that the LED module 11 includes three LED units 12; The linear LED driving circuit for adjusting the voltage using the fractional voltage divider further includes: a multiplexer 31 connected to the voltage dividing controller 30 and serially connected to the selection switch 23 and the LED module 11 The multiplexer 31 is connected between the LED units 12, and the selection switch 23 is selectively connected between the two LED units 12 through the control 30 of the voltage dividing controller; a storage capacitor 25, one end of which is connected between the switch 23 and the multiplexer 31, and the other end is connected to the anode of the switch diode 24; and a grounding diode 26 whose cathode is connected to the storage Between the capacitor 25 and the switch diode 24, the anode is connected to a ground terminal; wherein the switch diode 24 is connected to the ground through the ground diode 26.

It can be seen from the above structure that the fourth embodiment combines the features of the foregoing two embodiments, and can not only change the voltage value of the voltage dividing capacitor 21 through the switching of the multiplexer 31, but also can pass through the storage capacitor 25. Further providing a more stable current.

Referring to FIG. 5, a fifth embodiment of a linear LED driving circuit using a fractional voltage divider to adjust a voltage according to the present invention includes: a rectifying unit 10 connected to an AC power source AC/IN, and The AC power supply AC/IN is converted into a pulsating DC power supply. In this embodiment, the rectifying unit 10 is a full-wave rectifier-LED module 11, which is connected in series with the rectifying unit 10 and includes a plurality of LEDs. In the embodiment, the LED module 11 includes two LED units 12, and each LED unit 12 includes a plurality of LED light sources; a certain current controller 13 is connected in series with the LED module 11 and Between the ground terminals, and forming a power supply circuit; wherein the constant current controller 13 is configured to fix a current flowing through the power supply circuit to a certain value; in the embodiment, the constant current controller 13 includes a voltage control power a crystal 14 , a current detecting unit 15 connected in series with the voltage control transistor 14 , and a steady current control unit 16 electrically connected to the voltage control transistor 14 and the current detecting unit 15 ; wherein the voltage controlled transistor 14 The current detecting unit 15 is connected in series to the LED module 11, Forming the power circuit: and the current detecting unit 15 detects the current flowing through the power circuit, and transmits the detected current signal to the steady current control unit 16 through a low frequency filter 17; The flow control unit 16 controls the current flowing through the power supply circuit through the voltage control transistor 14 according to the current signal to maintain the current of the power supply circuit. The series of parallel-type fractional voltage dividers 40 are connected to the LED. The module 11 and the constant current controller 13 have a series mode and a parallel mode, and include a voltage dividing capacitor 41. The series mode connects the voltage dividing capacitor 41 to the LED module 11 and the Between the current controllers 13 and the parallel mode, the voltage dividing capacitor 41 is connected between the at least one LED unit 12 and the ground terminal. In this embodiment, the voltage dividing capacitor 41 has a positive terminal and The serial-type fractional voltage divider 40 further includes a control diode 42, a selection switch 43, a switching diode 44, a bypass transistor 45, and a shunt resistor 46, wherein: Control diode 42 is connected in series to the divided piezoelectric The capacitor 41 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 to the control diode 42 and the branch Between the piezoelectric capacitors 41 and the other end is connected between the two LED units 12; the switching diode 44 includes an anode and a cathode, and the cathode is connected to the negative terminal of the voltage dividing capacitor 21, The anode is connected to a ground; the bypass transistor 45 is connected to the anode of the control diode 42 and includes a control terminal V _g ; the bypass resistor 46 has one end connected in series to the bypass a transistor 45, the other end is connected to the ground; and a voltage divider controller 30 has a built-in voltage safety value V _F and is connected to the rectifying unit 10 and the serial-parallel fractional voltage divider 40; wherein the lines dividing the controller 30 detects the voltage value V _dc power supply 10 of the pulsating DC output of the rectifier unit; and when the voltage of the pulsating DC power source V _dc above the safety value exceeds the voltage V _F of controlling the serial-based formula The fractional voltage divider is in series mode; otherwise, the string is combined Parallel mode pressure; in this embodiment, the dividing line controller 30 connected to the control terminal of the selection switch 43 and the bypass transistor 45, and when the voltage value of the power of the pulsating DC voltage V _dc is greater than the safety When the value is V _F , the selection switch 43 and the bypass transistor 45 are controlled to be in an off state, and vice versa.

It can be seen from the above configuration that when the serial-parallel fractional voltage divider 40 is in the series mode, the voltage-dividing capacitor 41 is connected in series to the LED module 11 and the constant current controller 13 Therefore, as in the first embodiment of the present invention, the voltage value V _dc of the pulsating DC power source is divided into a portion to the voltage dividing capacitor 41; and when the series-parallel fractional voltage divider 20 is in parallel mode The voltage dividing capacitor 41 is connected between the at least one LED unit 12 and the ground, and the voltage dividing capacitor 41 is discharged to provide a steady current to the at least one LED unit 12; The discharge path of the voltage dividing capacitor 41 is via the selection switch 43, the at least one LED unit 12, the bypass transistor 45, the shunt resistor 46, and the switching diode 44.

When the series-type fractional voltage divider 40 enters the series mode again, since the voltage dividing capacitor 41 discharges at least one LED unit 12, the voltage across the voltage dividing capacitor 41 is the same as the present invention. The first embodiment is equivalent to the partial voltage of the pulsating DC power supply to the voltage value of the voltage dividing capacitor 21; similarly, the user can also set the voltage dividing capacitor 41 by using the voltage dividing capacitor 41 in the fifth embodiment. The number of connected LED units 12, in turn, determines the voltage value across the voltage dividing capacitor 21.

Referring to FIG. 6 , it is a sixth embodiment of the present invention. The structure is substantially the same as that of the fifth embodiment. However, the difference is that in the embodiment, the LED module 11 includes three LEDs. Unit 12; and the linear LED driving circuit system using the fractional voltage divider to adjust the voltage further includes: a multiplexer 31 is connected to the voltage dividing controller 30 and is connected in series between the selection switch 43 and the LED module 11; wherein the multiplexer 31 is connected between the LED units 12, and The selector switch 43 is selectively connected between the two of the LED units 12 by the control of the voltage dividing controller 30.

It can be seen from the above configuration that the sixth embodiment of the present invention has the same principle as the second embodiment, and the number of the LED units 12 connected to the voltage dividing capacitor 41 is set by the switching of the multiplexer 31. The voltage value on the voltage dividing capacitor 21 is determined.

Referring to FIG. 7, it is a seventh embodiment of the present invention, and its structure is substantially the same as that of the fifth embodiment; however, the difference is that the selection switch 43 is a selection diode 47, and the selection diode is selected. The body 47 includes an anode and a cathode; wherein the selective diode 47 has an anode connected between the control diode 42 and the voltage dividing capacitor 41, and a cathode connected between the two LED units 12.

Referring to FIG. 7 and FIG. 8 , the AC power supply AC/IN has a voltage effective value of 110 volts (peak value is 156 volts), and the voltage safety value V _F is 120 volts, and the above voltage and voltage are divided. The cut-in voltage V _LED2 of the LED unit 12 connected to the capacitor 41 is 20 volts, and the cut-in voltage V _LED1 of the remaining LED units 12 is 100 volts; at this time, since the voltage value on the voltage dividing capacitor 21 is equal to the above-mentioned points The cut-in voltage V _LED2 of the LED unit 12 connected to the piezoelectric capacitor 41 is 20 volts.

Therefore, when the maximum peak voltage 156 volts of the AC power source AC/IN exceeds the voltage safety value V _F (120) volts, the series-parallel fractional voltage divider 40 is in series mode; and the above is connected to the voltage dividing capacitor 41. The LED unit 12 is subjected to a voltage of 20 volts, and the remaining LED units 12 are subjected to a voltage of 100 volts, and the voltage dividing capacitor 21 is subjected to a voltage of 20 volts and continuously charged, and the constant current controller 13 is subjected to the rest. 19 volts.

Referring to FIG. 9, the voltage V _t (20 volts) of the voltage dividing capacitor 41 is equal to the cutting voltage (20 volts) of the LED unit 12 connected to the voltage dividing capacitor 41; therefore, the voltage dividing is performed. The voltage (20 volts) that the capacitor 41 is subjected to accounts for one-sixth of the cut-in voltage (120 volts) of all the LED units 12 in the LED module 11, so we can refer to such a pattern as a circuit except 1.16; The voltage (1+X) V _F experienced by the present invention is boosted to the cut-in voltage (120 volts) of all LED units 12 plus the voltage (20 volts) that the voltage dividing capacitor 41 is subjected to, wherein X is all The cut-in voltage (120 volts) of the LED unit 12 is divided by the voltage (20 volts) that the voltage dividing capacitor 41 is subjected to, and its value is 0.16.

In summary, the present invention can determine the voltage value of the voltage dividing capacitor 21 by setting the number of the LED units 12 connected to the voltage dividing capacitors 21, 41, so that the present invention can be applied to different voltages; Therefore, the manufacturer of the AC LED driving circuit only needs to design an identical circuit, and according to different requirements, the number of the LED units 12 connected to the voltage dividing capacitors 21, 41 can be set, so that the present invention can be applied to different AC power sources. The voltage range; to solve the cost of the manufacturer and the storage pressure.

10‧‧‧Rectifier unit

11‧‧‧LED module

12‧‧‧LED unit

13‧‧‧Constant current controller

14‧‧‧voltage controlled transistor

15‧‧‧current detection unit

16‧‧‧ steady flow control unit

17‧‧‧Frequency filter

20‧‧‧Sorted fractional voltage divider

21‧‧‧Voltage Capacitor

22‧‧‧Controlling the diode

23‧‧‧Selection switch

24‧‧‧Switching diode

25‧‧‧ Storage Capacitor

26‧‧‧ Grounding diode

30‧‧‧Voltage controller

31‧‧‧Multiplexer

40‧‧‧Sorted fractional voltage divider

41‧‧‧voltage capacitor

42‧‧‧Control diode

43‧‧‧Selection switch

44‧‧‧Switching diode

45‧‧‧Bypass transistor

46‧‧‧Bypass resistor

47‧‧‧Selecting a diode

50‧‧‧Rectifier unit

51‧‧‧LED unit

52‧‧‧Constant current controller

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

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

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

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

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

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

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

Fig. 8 is a waveform diagram showing voltage and current of respective elements of a seventh embodiment of the present invention.

Figure 9 is a waveform diagram of the pulsating DC voltage of a linear LED drive circuit using a fractional voltage divider to regulate voltage.

Figure 10: Circuit diagram of a linear LED driver circuit.

10‧‧‧Rectifier unit

11‧‧‧LED module

12‧‧‧LED unit

13‧‧‧Constant current controller

14‧‧‧voltage controlled transistor

15‧‧‧current detection unit

16‧‧‧ steady flow control unit

17‧‧‧Frequency filter

20‧‧‧Sorted fractional voltage divider

21‧‧‧Voltage Capacitor

22‧‧‧Controlling the diode

23‧‧‧Selection switch

24‧‧‧Switching diode

30‧‧‧Voltage controller

31‧‧‧Multiplexer

Claims (11)

A linear LED driving circuit using a fractional voltage divider to regulate voltage comprises: a rectifying unit connected to an alternating current power source and converting the alternating current power source into a pulsed direct current power source; and an LED module connected in series The rectifier unit includes a plurality of LED units; a constant current controller is connected between the LED module and a ground terminal, and constitutes a power circuit; wherein the constant current controller is configured to flow through the power circuit The current is fixed to a certain value; a series of parallel fractional voltage dividers are connected between the rectifying unit and the LED module, and have a series mode and a parallel mode, and include a voltage dividing capacitor; wherein the series mode is The voltage dividing capacitor is connected between the rectifying unit and the LED module, and the parallel mode connects the voltage dividing capacitor to at least one of the LED unit and the ground end; and a voltage dividing controller, a built-in voltage safety value is connected to the rectifying unit and the serial-parallel fractional voltage divider; wherein the voltage dividing controller detects the voltage value of the pulsating DC power source output by the rectifying unit; Pulsed DC power voltage exceeds the safe voltage threshold lines to control the fractional divider type serial line mode; otherwise, the control of the series and parallel fractional divider parallel mode. A linear LED driving circuit using a fractional voltage divider to adjust a voltage as described in claim 1, wherein: the series-parallel fractional voltage divider has a positive voltage terminal and a negative terminal, and further includes: a control diode is connected in series to the voltage dividing capacitor and includes an anode and a cathode; wherein an anode of the control diode is connected to a negative end of the voltage dividing capacitor; and a selection switch is connected at one end To the rectifying unit, the other end is connected between two of the LED units; and a switching diode includes an anode and a cathode, and a cathode is connected to the voltage dividing capacitor and the control diode And the anode is connected to the ground; and the voltage dividing controller is connected to the selection switch, and when the voltage value of the pulsating DC power source is greater than the voltage safety value, the selection switch is controlled to be in an off state, and vice versa. Then it shows a conduction state. The linear LED driving circuit using the fractional voltage divider to adjust the voltage according to claim 2, further comprising: a multiplexer connected to the voltage dividing controller and serially connected to the selection switch and the LED Between the modules; wherein the multiplexer is connected between the LED units, and the selection switch is selectively connected between the two LED units by the control of the voltage dividing controller. The linear LED driving circuit using the fractional voltage divider to adjust the voltage according to claim 2, further comprising: a storage capacitor, one end of which is connected between the switching switch and the LED module, and the other end is connected An anode connected to the switching diode; and a grounding diode comprising an anode and a cathode, wherein a cathode is connected between the storage capacitor and the switching diode, and an anode is connected to the anode a grounding terminal; wherein the switching diode system is connected to the grounding terminal through the grounding diode. The linear LED driving circuit using the fractional voltage divider to adjust the voltage according to claim 2, further comprising: a multiplexer connected to the voltage dividing controller and serially connected to the selection switch and the LED Between the modules; wherein the multiplexer is connected between the LED units, and the selection switch is selectively connected between the two LED units by the control of the voltage dividing controller; a storage capacitor, one end thereof Connected to the switch and the multiplexer, and the other end is connected to the anode of the switch diode; and a ground diode connected to the storage capacitor and the switch diode And the anode is connected to a grounding terminal; wherein the switching diode system is connected to the grounding terminal through the grounding diode. A linear LED driving circuit using a fractional voltage divider to adjust a voltage according to any one of claims 1 to 5, wherein the constant current controller comprises: a voltage controlled transistor serially connected to the LED unit And forming a power circuit; a current detecting unit is connected in series with the voltage control transistor; and the current detecting unit detects current flowing through the power circuit; and a steady current control unit is electrically connected to The voltage-controlled transistor and the current detecting unit read the current signal detected by the current detecting unit through a low-frequency filter; wherein the steady-current control unit transmits the voltage-controlled transistor according to the current signal The current flowing through the power supply loop is then adjusted. A linear LED driving circuit using a fractional voltage divider to regulate voltage, comprising a rectifying unit connected to an alternating current power source and converting the alternating current power source into a pulsed direct current power source; and an LED module connected in series Unit with multiple LEDs a unit; a current controller is connected between the LED module and a ground terminal, and constitutes a power circuit; wherein the constant current controller fixes a current flowing through the power circuit to a certain value; a fractional voltage divider connected between the LED module and the constant current controller, and having a series mode and a parallel mode, and including a voltage dividing capacitor; wherein the series mode is to connect the voltage dividing capacitor in series The LED module is connected to the constant current controller, and the parallel mode connects the voltage dividing capacitor to at least one of the LED units and the ground terminal; and a voltage dividing controller has a built-in voltage safety gauge And connected to the rectifying unit and the serial-parallel fractional voltage divider; wherein the voltage dividing controller detects a voltage value of the pulsating DC power source output by the rectifying unit; and when the voltage value of the pulsating DC power source exceeds The voltage safety value controls the series-parallel fractional voltage divider to be in series mode; otherwise, the serial-parallel fractional voltage divider is controlled to be in parallel mode. A linear LED driving circuit using a fractional voltage divider to adjust a voltage as described in claim 7, wherein the series-divided fractional voltage divider has a positive terminal and a negative terminal, and further: a control diode Connected to the voltage dividing capacitor, and includes an anode and a cathode; wherein the cathode of the control diode is connected to the positive terminal of the voltage dividing capacitor; and a selection switch has one end connected to the control diode Between the body and the voltage dividing capacitor, and the other end is connected between two of the LED units; a switching diode comprising an anode and a cathode, and a cathode thereof Connected to the negative terminal of the voltage dividing capacitor, and the anode is connected to a ground terminal; a bypass transistor is connected to the anode of the control diode and includes a control terminal; and a bypass resistor, one end thereof Connected to the bypass transistor in series, and the other end is connected to the ground terminal; and the voltage dividing controller is connected to the selection switch and the control terminal of the bypass transistor, and when the voltage of the pulsating DC power source is When the value is greater than the voltage safety value, the selection switch and the bypass transistor are controlled to be in an off state, and vice versa. The linear LED driving circuit using the fractional voltage divider to adjust the voltage according to claim 8, further comprising: a multiplexer connected to the voltage dividing controller and serially connected to the selection switch and the LED module Between the groups; wherein the multiplexer is connected between the LED units, and the selection switch is selectively connected between the two LED units by the control of the voltage dividing controller. A linear LED driving circuit using a fractional voltage divider to adjust a voltage as described in claim 8, wherein the selective opening relationship is a selection diode, and the selective two-pole system comprises an anode and a cathode; wherein the selection diode The anode is connected between the control diode and the voltage dividing capacitor, and the cathode is connected between the two LED units. A linear LED driving circuit using a fractional voltage divider to adjust a voltage according to any one of claims 7 to 10, wherein the constant current controller comprises: a voltage controlled transistor serially connected to the LED unit And constitute a power circuit; a current detecting unit is connected in series with the voltage control transistor; and the current detecting unit detects current flowing through the power circuit; and a steady current control unit is electrically connected to the voltage controlled transistor and the The current detecting unit reads the current signal detected by the current detecting unit through a low frequency filter; wherein the steady current control unit passes through the voltage control transistor to adjust the flow through the power circuit according to the current signal Current.