WO2018094970A1 - Circuit d'attaque à courant constant linéaire destiné à une del, et appareil d'éclairage à del - Google Patents

Circuit d'attaque à courant constant linéaire destiné à une del, et appareil d'éclairage à del Download PDF

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Publication number
WO2018094970A1
WO2018094970A1 PCT/CN2017/083406 CN2017083406W WO2018094970A1 WO 2018094970 A1 WO2018094970 A1 WO 2018094970A1 CN 2017083406 W CN2017083406 W CN 2017083406W WO 2018094970 A1 WO2018094970 A1 WO 2018094970A1
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Prior art keywords
constant current
module
led
resistor
output
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PCT/CN2017/083406
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English (en)
Chinese (zh)
Inventor
李照华
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深圳市明微电子股份有限公司
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Publication of WO2018094970A1 publication Critical patent/WO2018094970A1/fr

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/395—Linear regulators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention belongs to the field of LED driving control, and in particular, to an LED linear constant current driving circuit and an LED lighting device.
  • LED Light Emitting Diode
  • Common LED driving methods are divided into a power supply drive and a linear drive.
  • the linear drive is widely popularized with its simple structure and low cost.
  • the number of LED lamps determines that the input voltage can only be changed within a small range. If the input voltage is lower than the operating voltage, the LED lamp cannot be lit; if the input voltage is higher than the operating voltage, the driving power consumption is increased and the temperature rises. , affect the reliability of LED lights.
  • the input voltage of the existing LED linear constant current driving circuit can be changed in a small range, and the application of a wide input voltage cannot be realized.
  • An object of the present invention is to provide an LED linear constant current driving circuit and an LED lighting device, which are intended to solve the problem that the input voltage of the existing LED linear constant current driving circuit has a small variable range and cannot realize a wide input voltage. Application issues.
  • an LED linear constant current driving circuit is connected to a first LED light string and a second LE D light string, the LED linear constant current driving circuit includes a rectifying module, and the rectifying module Rectifying the alternating current, and outputting direct current to supply power to the first LED string and the second LED string, wherein the LED linear constant current driving circuit further comprises a serial-to-parallel conversion module, a first constant current driving module, a constant current driving module, a third constant current driving module and a switching module;
  • the input end of the control module is connected to the first output end of the rectifier module, and the output end of the third constant current control module is connected to the input end of the first LED string, and the serial conversion module
  • the two ends, the output end of the first constant current driving module, the output end of the second LED string, and the second output end of the rectifier module are connected to the ground, and the input of the first constant current control module
  • the output end of the first LED light string is connected to the input end of the switching module, and the voltage input end and the controlled end of the first constant current driving module and the output of the serial-to-parallel conversion module respectively
  • the terminal is connected to the control end, and the controlled end and the output end of the second constant current driving module are respectively connected to the output end of the switching module and the input end of the second LED string;
  • the switching module when the output voltage of the rectifier module is less than or equal to a first preset voltage threshold ⁇ , the switching module is turned off, the first LED light string and the second LED light string are connected in parallel, The first constant current control module and the second constant current control module respectively perform constant current control on the first LED light string and the second LED light string; when the output voltage of the rectifier module rises to be greater than the first Presetting the voltage threshold and continuing to rise and being less than the second preset voltage threshold ⁇ , the serial-to-parallel conversion module adjusts the output current of the first constant current control module, and then performs constant power control on the input power of the subsequent circuit
  • the switching module is turned on, and the first constant current control mode and the second constant current control module are turned off.
  • the first LED light string and the second LED light string are connected in series, and the third constant current control module performs constant current control on the first LED light string and the second L ED light string.
  • the present invention further provides an LED linear constant current driving circuit, which is connected to a first LED light string and a second LED light string, wherein the LED linear constant current driving circuit includes a rectifying module, and the rectifying module performs an alternating current Rectifying, and outputting direct current power for the first LED light string and the second LED light string, the LED linear constant current driving circuit further comprising a serial to parallel conversion module, a first constant current driving module, and a second constant current a driving module, a third constant current driving module and a switching module;
  • the first end of the serial-to-parallel conversion module, the input end of the first LED light string, and the input end of the second constant current control module are connected to the first output end of the rectifier module.
  • the second end of the serial-to-parallel conversion module, the output end of the first constant current driving module, the output end of the third constant current control module, and the second output end of the rectifier module are connected to the ground.
  • the input end of the first constant current control module and the output end of the first LED string are connected to the input end of the switching module, and the voltage input end and the controlled end of the first constant current driving module respectively
  • the output of the serial to parallel conversion module is connected to the control end, and the second constant current
  • the controlled end and the output end of the driving module are respectively connected to the output end of the switching module and the input end of the second LED string, the output end of the second LED string and the third constant current control Module input connection
  • the switching module when the output voltage of the rectifier module is less than or equal to a first preset voltage threshold ⁇ , the switching module is turned off, the first LED light string and the second LED light string are connected in parallel, The first constant current control module and the second constant current control module respectively perform constant current control on the first LED light string and the second LED light string; when the output voltage of the rectifier module rises to be greater than the first Presetting the voltage threshold and continuing to rise and being less than the second preset voltage threshold ⁇ , the serial-to-parallel conversion module adjusts the output current of the first constant current control module, and then performs constant power control on the input power of the subsequent circuit
  • the switching module is turned on, and the first constant current control mode and the second constant current control module are turned off.
  • the first LED light string and the second LED light string are connected in series, and the third constant current control module performs constant current control on the first LED light string and the second L ED light string.
  • the present invention also provides an LED lighting device, which is connected to an alternating current power source, and includes a first LED light string and a second LED light string.
  • the LED lighting device further includes the LED linear constant current driving circuit described above.
  • the LED linear constant current driving circuit comprises a rectifying module, a serial-to-parallel conversion module, a first constant current driving module, a second constant current driving module, a third constant current driving module and a switching module;
  • the output voltage is less than or equal to the first preset voltage threshold ⁇ , the off module is turned off, the first LED string and the second LED string are connected in parallel, and the first constant current control module and the second constant current control module respectively
  • An LED string and a second LED string are subjected to constant current control; when the output voltage of the rectifier module rises above a first preset voltage threshold and continues to rise and is less than a second preset voltage threshold, the serial-to-parallel conversion module is first The output current of the constant current control module is adjusted, and then the input power of the subsequent circuit is controlled by constant power; when the output voltage of the rectifier module continues to rise to be greater than or equal to the second preset voltage threshold, the switch module is turned on, A constant current control mode and a second constant current control
  • FIG. 1 is a block diagram showing the structure of an LED linear constant current driving circuit according to a first embodiment of the present invention
  • FIG. 2 is a circuit structural diagram of an LED linear constant current driving circuit according to a first embodiment of the present invention
  • FIG. 3 is a block diagram showing the structure of an LED linear constant current driving circuit according to a second embodiment of the present invention.
  • FIG. 4 is a circuit structural diagram of an LED linear constant current driving circuit according to a second embodiment of the present invention.
  • FIG. 5 is a block diagram showing the structure of an LED linear constant current driving circuit according to a third embodiment of the present invention.
  • FIG. 6 is a circuit structural diagram of an LED linear constant current driving circuit according to a third embodiment of the present invention.
  • FIG. 7 is a block diagram showing the structure of an LED linear constant current driving circuit according to a fourth embodiment of the present invention.
  • FIG. 8 is a circuit structural diagram of an LED linear constant current driving circuit according to a fourth embodiment of the present invention.
  • FIG. 9 is a schematic diagram showing the relationship between the input power of the subsequent stage circuit and the output voltage of the rectifier module according to an embodiment of the present invention.
  • FIG. 1 shows a block structure of an LED linear constant current driving circuit according to a first embodiment of the present invention.
  • the LED linear constant current driving circuit As shown in FIG. 1 , the LED linear constant current driving circuit provided in this embodiment is connected to the first LED light string 10 and the second L ED light string 20 , and the LED linear constant current driving circuit includes a rectifier module 1 and a rectifier module. The input end of 1 is connected to the AC power source AC, and the rectifier module 1 rectifies the AC power output from the AC power source AC, and outputs DC power to supply power to the first LED string 10 and the second LED string 20.
  • the first LED light string 10 and the second LED light string 20 are each formed by a plurality of light emitting diodes connected in series according to the cathode of the previous light emitting diode connected to the anode of the next light emitting diode.
  • the first LED light string 10 Or the anode of the first LED in the second LED string 20 is the input end of the first LED string 10 or the second LED string 20, and the last one of the first LED string 10 or the second LED string 20
  • the cathode of the diode is the output of the first LED string 10 or the second LED string 20.
  • the number of L ED lamps in the first LED string 10 and the number of LED lamps in the second LED string 10 may be equal or unequal, ie, The forward conduction voltage of one LED string 10 and the forward conduction voltage of the second LED string 20 may or may not be equal.
  • the LED linear constant current driving circuit further includes a serial to parallel conversion module 2, a first constant current driving module 3, a second constant current driving module 4, a third constant current driving module 5, and a switching module 6.
  • the first end of the serial-to-parallel conversion module 2, the input end of the third constant current control module 5, and the input end of the second constant current control module 4 are connected to the first output end of the rectifying module 1, and the third constant current
  • the output end of the control module 5 is connected to the input end of the first L ED string 10, the second end of the serial-to-parallel conversion module 2, the output end of the first constant current driving module 3, and the output end of the second LED string 20 and
  • the second output end of the rectifier module 1 is connected to the ground.
  • the input end of the first constant current control module 3 and the output end of the first LED light string 10 are connected to the input end of the switching module 6, and the first constant current driving module
  • the voltage input terminal and the controlled terminal of the third constant current driving module 4 are respectively connected to the output end and the control terminal of the serial-parallel driving module 2, and the output terminal and the output terminal of the second constant current driving module 4 respectively correspond to the output terminal and the second terminal of the switching module 6.
  • the input terminals of the LED string 20 are connected.
  • the output voltage of the rectifier module 1 reaches the forward conduction voltage ⁇ of the first LED string 10 or the second LED string 20, the output voltage of the rectifier module 1 is less than or equal to the first preset voltage threshold,
  • the first LED string 10 and the second LED string 20 are connected in parallel, and the first constant current control module 3 and the second constant current control module 4 respectively respectively pair the first LED string 10 and the second LED
  • the light string 20 performs constant current control, and the third constant current control module 5 does not perform constant current control on the LED light string;
  • the serial-to-parallel conversion module 2 adjusts the output current of the first constant current control module 3, and then performs constant power control on the input power of the subsequent stage circuit; when the output voltage of the rectifier module 1 continues to rise to be greater than or equal to the second The preset voltage threshold ⁇ , the switching module 6 is turned on, the first constant
  • the latter stage circuit specifically includes a serial to parallel conversion module 2, a first constant current control module 3, a second constant current control module 4, a third constant current control module 5, and a gate module 6
  • the serial-to-parallel conversion module 2 controls the first constant current control module 3 to be turned off.
  • Peer by The output voltage of the second constant current control module 4 is greater than the first reference voltage, and therefore, the second constant current control module 4 is also in an off state.
  • the first preset voltage threshold, the second preset voltage threshold, and the third preset voltage threshold may be set according to actual conditions, and no limitation is made herein.
  • the rectifier module 1 may be a bridge rectifier circuit, or may be other types of rectifier circuits, and is specifically set according to actual conditions, and is not limited herein.
  • the voltage value of the AC power source AC may be 110V ⁇ 220V, that is, the input AC voltage may vary within 110V-220V, so that the LED linear constant current driving circuit realizes the application of the wide input voltage.
  • the output current of the first constant current control module 3 is adjusted by the serial-to-parallel conversion module 2, thereby adjusting the power of the first LED string 10, so that the input power of the subsequent stage circuit
  • the LED linear constant current driving circuit provided by the embodiment of the present invention removes the filter capacitor connected in parallel with the output end of the rectifier module 1 and improves the power factor of the circuit.
  • FIG. 2 shows a circuit configuration of an LED linear constant current driving circuit according to a first embodiment of the present invention.
  • the first constant current control module 3 includes a first operational amplifier E Al , a first bypass transistor N1 , and a first resistor R1 .
  • the non-inverting input terminal of the first operational amplifier EA1 is the voltage input end of the first constant current control module 3, and the output end of the first operational amplifier EA1 is connected with the control terminal of the first switching transistor N1 as the first constant current.
  • the controlled end of the control module 3 the high potential end of the first switch N1 is the input end of the first constant current control module 3, and the low potential end of the first switch N1 is common to the first end of the first resistor R1 Connected to the inverting input terminal of the first operational amplifier EA1, the second end of the first resistor R1 is the output end of the first constant current control module 3.
  • the second constant current driving module 4 includes a second operational amplifier EA2, a second switching transistor N2, and a second resistor.
  • the non-inverting input terminal and the output terminal of the second operational amplifier EA2 are respectively connected to the control terminals of the first reference voltage source and the second switch transistor N2, and the high potential end of the second switch transistor N2 is the second constant current drive module 4
  • the first end of the second resistor R2 is connected to the inverting input terminal of the second operational amplifier EA2, and the first end and the second end of the second resistor R2 are respectively The second constant current drives the controlled end and the output of the module 4.
  • the third constant current driving module 5 includes a third operational amplifier EA3, a third The switch N2 and the third resistor R3 are closed.
  • the non-inverting input terminal and the output terminal of the third operational amplifier EA3 are respectively connected to the control terminals of the first reference voltage source and the third switch transistor N3, and the high potential end of the third switch transistor N3 is the third constant current drive module 5
  • the input terminal, the low terminal of the third switch N3 and the first end of the third resistor R3 are connected to the inverting input end of the third operational amplifier EA3, and the second end of the third resistor R3 is the third constant current drive.
  • the first reference voltage source provides a first reference voltage Vref for the second operational amplifier EA2 and the third operational amplifier EA3.
  • the first bypass transistor N1, the second bypass transistor N2, and the third bypass transistor N3 may each be an NMOS transistor, and the gate, the source, and the drain of the NMOS transistor are respectively The control terminal, the low potential terminal and the high potential terminal of the N1 (or the second bypass transistor N 2 or the third bypass transistor N3).
  • the first switch N1, the second switch N2, and the third switch N3 can also be implemented by using a triode or a field effect transistor, and there is no limitation.
  • the serial-to-parallel conversion module 2 includes a first filter capacitor C1, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and a fourth switch N4.
  • the switch N5 the first amplifier Ampl, the second amplifier Amp2, and the comparator Compl.
  • the first end of the fourth resistor R4 and the second end of the fifth resistor R5 are respectively a first end and a second end of the serial-to-parallel conversion module 2, and a second end of the fourth resistor R4, the first filter capacitor C1
  • the first end of the first amplifier, the non-inverting input of the first amplifier Ampl and the non-inverting input of the comparator Comp1 are connected to the first end of the fifth resistor R5, and the second end of the first filter capacitor C1 and the second output of the rectifier module 1
  • the terminal connection, the control terminal and the high potential terminal of the fourth switch N4 are respectively connected to the output end of the first amplifier Ampl and the power supply, and the low potential end of the fourth switch N4 is connected with the first end of the sixth resistor R6.
  • the second terminal of the sixth resistor R6 and the first terminal of the seventh resistor R7 are connected to the inverting input terminal of the second amplifier Amp2, and the non-inverting input terminal of the second amplifier Amp2 is connected to the inverting input terminal of the first amplifier Ampl.
  • the first reference voltage source is connected
  • the output end of the second amplifier Amp2 is connected to the second end of the seventh resistor R7 as the output end of the serial-to-parallel conversion module 2
  • the inverting input terminal of the comparator Comp1 is connected to the second reference voltage source.
  • Jian fifth switch tube N5 is higher potential side is serial converter control terminal module 2.
  • the resistance of the third resistor R3 is smaller than the resistance of the second resistor R2, and the third resistor R The resistance of 3 is smaller than the resistance of the first resistor R1 to ensure that the first LED string 10 and the second LED string 20 are switched from a parallel connection to a series connection, and the second switch N2 is in an off state, ensuring The second cross flow control module 4 stops working.
  • the bypass module 6 is a diode D1.
  • the anode and cathode of diode D1 are the input and output of the shut-off module 6, respectively.
  • the LED linear constant current driving circuit Compared with the conventional LED linear constant current driving circuit, the LED linear constant current driving circuit provided by the embodiment of the present invention removes the filtering capacitor connected in parallel to the output end of the rectifying module 1, and connects the first filtering capacitor C1 to the fourth resistor R4. Between the common end of the fifth resistor R5 and the second output of the rectifier module 1, the LED linear constant current driving circuit can achieve a high power factor.
  • the third constant current control module 5 does not perform constant current control on the first LED string 10
  • the second constant current control module 4 performs constant current control on the second LED string 20, so that the flow through The current I 2 of the two LED string 20 is Vref/R2.
  • the current flowing through the first LED string 10 and the second LED string 20 can be adjusted by adjusting the values of the first reference voltage Vref, the first resistor R1, and the second resistor R2, respectively.
  • the output voltage VIN of the rectifier module 1 continues to rise to be greater than or equal to the second predetermined voltage threshold ⁇ , the output voltage VIN of the rectifier module 1 passes through the voltage divider VT of the fourth resistor R4 and the fifth resistor R5 is greater than or equal to the first The second reference voltage VR, the comparator Compl controls the fifth switch N5 to be turned on, the first switch N1 is turned off, the first constant current drive module 3 stops working, the diode D1 is turned on, and the rectifier module 1 is adjusted.
  • the voltage of the low potential terminal of the second bypass transistor N2 (the non-inverting input terminal of the second operational amplifier EA2) is greater than the first reference voltage Vref, therefore, The second operational amplifier EA2 outputs a low level, the second switching transistor N2 is turned off, and the second constant current control module 4 stops operating.
  • FIG 3 shows a block structure of an LED linear constant current driving circuit according to a second embodiment of the present invention.
  • the embodiment adjusts the connection relationship of the third constant current control module 5 on the basis of the first embodiment.
  • the LED linear constant current driving circuit provided by the embodiment of the present invention is connected to the first LED light string 10 and the second LED light string 20, and the LED linear constant current driving circuit includes a rectifier module 1 and a rectifier module.
  • the input end of 1 is connected to the AC power source AC, and the rectifier module 1 rectifies the AC power output from the AC power source AC, and outputs DC power to supply power to the first LED string 10 and the second LED string 20.
  • the LED linear constant current driving circuit further includes a serial to parallel conversion module 2, a first constant current driving module 3, a second constant current driving module 4, a third constant current driving module 5, and a switching module 6.
  • the first end of the serial-to-parallel conversion module 2, the input end of the first LED light string 10, and the input end of the second constant current control module 4 are connected to the first output end of the rectifier module 1, and the serial-to-parallel conversion module 2 Second end, first constant current drive
  • the output end of the module 3, the output end of the third constant current control module 5 and the second output end of the rectifying module 1 are connected to the ground, and the input end of the first constant current control module 3 and the output end of the first LED light string 10
  • the voltage input terminal and the controlled terminal of the first constant current driving module 3 are respectively connected to the output end and the control end of the serial-to-parallel conversion module 2, and the second constant current driving module 4 is connected.
  • the control terminal and the output terminal are respectively connected to the output terminal of the switching module 6 and the input terminal of the second LED lamp string 20, and the output terminal of the second LED lamp string 20 is connected to the input terminal of the third constant current control module 5.
  • the output voltage of the rectifier module 1 reaches the forward conduction voltage ⁇ of the first LED string 10 or the second LED string 20, the output voltage of the rectifier module 1 is less than or equal to the first preset voltage threshold,
  • the first LED string 10 and the second LED string 20 are connected in parallel, and the first constant current control module 3 and the second constant current control module 4 respectively respectively pair the first LED string 10 and the second LED
  • the light string 20 performs constant current control, and the third constant current control module 5 does not perform constant current control on the LED light string;
  • the serial-to-parallel conversion module 2 adjusts the output current of the first constant current control module 3, and then performs constant power control on the input power of the subsequent stage circuit; when the output voltage of the rectifier module 1 continues to rise to be greater than or equal to the second The preset voltage threshold ⁇ , the switching module 6 is turned on, the first constant
  • the latter stage circuit specifically includes a serial to parallel conversion module 2, a first constant current control module 3, a second constant current control module 4, a third constant current control module 5, and a bypass module 6.
  • the serial-to-parallel conversion module 2 controls the first constant current control module 3 to be turned off.
  • the second constant current control module is also in an off state.
  • the voltage value of the AC power source AC may be 110V ⁇ 220V, that is, the input AC voltage may vary within 110V-220V, so that the LED linear constant current driving circuit realizes the application of the wide input voltage.
  • the output current of the first constant current control module 3 is adjusted by the serial-to-parallel conversion module 2, thereby adjusting the power of the first LED string 10, so that the power of the first stage circuit is The input power is substantially unchanged; and compared with the conventional LED linear constant current driving circuit, the LED linear constant current driving circuit provided by the embodiment of the invention removes the filtering capacitor connected in parallel to the output end of the rectifier module 1, thereby improving the power factor of the circuit.
  • FIG. 4 shows a circuit configuration of an LED linear constant current driving circuit according to a second embodiment of the present invention.
  • each module in the LED linear constant current driving circuit provided by this embodiment is completely the same as the circuit structure of each module in the LED linear constant current driving circuit provided by an embodiment.
  • the circuit structure of each module in the LED linear constant current driving circuit provided by an embodiment please refer to The related descriptions in the first embodiment corresponding to FIG. 2 and FIG. 2 are not described herein again.
  • the output voltage VIN of the rectifier module 1 when the output voltage VIN of the rectifier module 1 reaches the forward conduction voltage ⁇ of the first LED string 10 or the second LED string 20, the output voltage VIN of the rectifier module 1 is less than or equal to the first a preset voltage threshold, wherein the output voltage VIN of the rectifier module 1 passes through the voltage divider VT of the fourth resistor R4 and the fifth resistor R5 is less than or equal to the first reference voltage Vre f, and the diode D1 is turned off, the first LED string 10 and the second LED string 20 are connected in parallel, the fourth switch N4 is turned off, and the voltage of the non-inverting input of the first operational amplifier EA1 is the first reference voltage Vref.
  • the second LED string 20 is not subjected to constant current control.
  • the current flowing through the first LED string 10 and the second LED string 20 can be adjusted by adjusting the values of the first reference voltage Vref, the first resistor R1, and the second resistor R2, respectively.
  • the output voltage VIN of the rectifier module 1 continues to rise to be greater than or equal to the second predetermined voltage threshold ⁇ , the output voltage VIN of the rectifier module 1 passes through the voltage divider VT of the fourth resistor R4 and the fifth resistor R5 is greater than or equal to the first The second reference voltage VR, the comparator Compl controls the fifth switch N5 to be turned on, the first switch N1 is turned off, the first constant current drive module 3 stops working, the diode D1 is turned on, and the rectifier module 1 is adjusted.
  • the voltage of the low potential terminal of the second bypass transistor N2 (the non-inverting input terminal of the second operational amplifier EA2) is greater than the first reference voltage Vref, therefore, The second operational amplifier EA2 outputs a low level, the second switching transistor N2 is turned off, and the second constant current control module 4 stops operating.
  • FIG. 5 shows a block structure of an LED linear constant current driving circuit according to a third embodiment of the present invention.
  • the LED linear constant current driving circuit provided by the embodiment of the present invention is connected to the first LED light string 10 and the second LED light string 20, and the LED linear constant current driving circuit includes the rectifier module 1 and the second The filter capacitor C2, the input end of the rectifier module 1 is connected to the AC power source AC, and the first end and the second end of the second filter capacitor C2 are respectively connected to the first output end and the second output end of the rectifier module 1, respectively, the rectifier module 1 and The second filter capacitor C 2 rectifies and filters the alternating current output from the alternating current power source AC, and outputs the direct current to supply power to the first L ED string 10 and the second LED string 20 .
  • the first LED light string 10 and the second LED light string 20 are sequentially connected in series by a plurality of light emitting diodes in accordance with the cathode of the previous light emitting diode connected to the anode of the next light emitting diode, and the first LED light string 10 is sequentially connected.
  • the anode of the first LED in the second LED string 20 is the input end of the first LED string 10 or the second LED string 20, and the last one of the first LED string 10 or the second LED string 20
  • the cathode of the diode is the output of the first LED string 10 or the second LED string 20.
  • the number of L ED lamps in the first LED string 10 and the number of LED lamps in the second LED string 10 may be equal or unequal, ie, The forward conduction voltage of an LED string 10 and the forward voltage of the second LED string 20 may be equal.
  • the LED linear constant current driving circuit further includes a serial to parallel conversion module 2, a first constant current driving module 3, a second constant current driving module 4, a third constant current driving module 5, and a switching module 6.
  • the first end of the serial-to-parallel conversion module 2, the input end of the third constant current control module 5, and the input end of the second constant current control module 4 are connected to the first output end of the rectifier module 1, and the third constant current
  • the output end of the control module 5 is connected to the input end of the first L ED string 10, the second end of the serial-to-parallel conversion module 2, the output end of the first constant current driving module 3, and the output end of the second LED string 20 and
  • the second output end of the rectifier module 1 is connected to the ground.
  • the input end of the first constant current control module 3 and the output end of the first LED light string 10 are connected to the input end of the switching module 6, and the first constant current driving module
  • the voltage input terminal and the controlled terminal of the third constant current driving module 4 are respectively connected to the output end and the control terminal of the serial-parallel driving module 2, and the output terminal and the output terminal of the second constant current driving module 4 respectively correspond to the output terminal and the second terminal of the switching module 6.
  • the input terminals of the LED string 20 are connected.
  • the output voltage of the rectifier module 1 reaches the forward conduction voltage ⁇ of the first LED string 10 or the second LED string 20, the output voltage of the rectifier module 1 is less than or equal to the first preset voltage threshold,
  • the first LED string 10 and the second LED string 20 are connected in parallel, and the first constant current control module 3 and the second constant current control module 4 respectively respectively pair the first LED string 10 and the second LED
  • the light string 20 performs constant current control, and the third constant current control module 5 does not perform constant current control on the LED light string;
  • the serial-to-parallel conversion module 2 adjusts the output current of the first constant current control module 3, and then performs constant power control on the input power of the subsequent stage circuit; when the output voltage of the rectifier module 1 continues to rise to be greater than or equal to the second The preset voltage threshold ⁇ , the switching module 6 is turned on, the first constant
  • the latter stage circuit specifically includes a serial to parallel conversion module 2, a first constant current control module 3, a second constant current control module 4, a third constant current control module 5, and a bypass module 6.
  • the serial-to-parallel conversion module 2 controls the first constant current control module 3 to be turned off. Similarly, since the output voltage of the second constant current control module is greater than the first reference voltage, the second constant current control module Also in the off state.
  • the voltage value of the AC power source AC may be 110V ⁇ 220V, that is, the input AC voltage may vary within 110V-220V, so that the LED linear constant current driving circuit realizes the application of the wide input voltage.
  • the output current of the first constant current control module 3 is adjusted by the serial-to-parallel conversion module 2, thereby adjusting the power of the first LED string 10, so that the input power of the subsequent stage circuit
  • the LED linear constant current driving circuit provided in this embodiment has a second filter capacitor C2 connected in parallel with the output end of the rectifier module 1, so that the first LED string 10 and the second LED string 20 can be made without frequency. flash.
  • FIG. 6 shows a circuit configuration of an LED linear constant current driving circuit according to a third embodiment of the present invention.
  • each module in the LED linear constant current driving circuit provided by this embodiment is completely the same as the circuit structure of each module in the LED linear constant current driving circuit provided by an embodiment.
  • the related descriptions in the first embodiment corresponding to FIG. 2 and FIG. 2 are not described herein again.
  • the third constant current control module 5 does not perform constant current control on the first LED string 10
  • the second constant current control module 4 performs constant current control on the second LED string 20, so that the flow through The current I 2 of the two LED string 20 is Vref/R2.
  • the current flowing through the first LED string 10 and the second LED string 20 can be adjusted by adjusting the values of the first reference voltage Vref, the first resistor R1, and the second resistor R2, respectively.
  • the output voltage VIN of the rectifier module 1 continues to rise to be greater than or equal to the second predetermined voltage threshold ⁇ , the output voltage VIN of the rectifier module 1 passes through the voltage divider VT of the fourth resistor R4 and the fifth resistor R5 is greater than or equal to the first The second reference voltage VR, the comparator Compl controls the fifth switch N5 to be turned on, the first switch N1 is turned off, the first constant current drive module 3 stops working, the diode D1 is turned on, and the rectifier module 1 is adjusted.
  • the voltage of the low potential terminal of the second bypass transistor N2 (the non-inverting input terminal of the second operational amplifier EA2) is greater than the first reference voltage Vref, therefore, The second operational amplifier EA2 outputs a low level, the second switching transistor N2 is turned off, and the second constant current control module 4 stops operating.
  • FIG. 7 shows a block structure of an LED linear constant current driving circuit according to a fourth embodiment of the present invention.
  • the LED linear constant current driving circuit provided by the embodiment of the present invention is connected to the first LED light string 10 and the second LED light string 20, and the LED linear constant current driving circuit includes the rectifier module 1 and the second The filter capacitor C2, the input end of the rectifier module 1 is connected to the AC power source AC, and the first end and the second end of the second filter capacitor C2 are respectively connected to the first output end and the second output end of the rectifier module 1, respectively, the rectifier module 1 and The second filter capacitor C 2 rectifies and filters the alternating current output from the alternating current power source AC, and outputs the direct current to supply power to the first L ED string 10 and the second LED string 20 .
  • the LED linear constant current driving circuit further includes a serial to parallel conversion module 2, a first constant current driving module 3, a second constant current driving module 4, a third constant current driving module 5, and a switching module 6.
  • the first end of the serial-to-parallel conversion module 2, the input end of the first LED light string 10, and the input end of the second constant current control module 4 are connected to the first output end of the rectifier module 1, and the serial-to-parallel conversion module 2
  • the second end, the output end of the first constant current driving module 3, the output end of the third constant current control module 5, and the second output end of the rectifying module 1 are connected to the ground, and the input end of the first constant current control module 3
  • the output end of the first LED string 10 is connected to the input end of the switching module 6, and the voltage input end and the controlled end of the first constant current driving module 3 are respectively connected to the output end and the control end of the serial-to-parallel conversion module 2
  • the controlled end and the output end of the second constant current driving module 4 are respectively connected to the output end of the switching module 6 and the input end of the second LED string 20, and the output end of the second LED string 20 and the third constant current
  • the inputs of the control module 5 are connected.
  • the output voltage of the rectifier module 1 reaches the forward conduction voltage ⁇ of the first LED string 10 or the second LED string 20, the output voltage of the rectifier module 1 is less than or equal to the first preset voltage threshold,
  • the first LED string 10 and the second LED string 20 are connected in parallel, and the first constant current control module 3 and the second constant current control module 4 respectively respectively pair the first LED string 10 and the second LED
  • the light string 20 performs constant current control, and the third constant current control module 5 does not perform constant current control on the LED light string;
  • the serial-to-parallel conversion module 2 adjusts the output current of the first constant current control module 3, and then performs constant power control on the input power of the subsequent stage circuit; when the output voltage of the rectifier module 1 continues to rise to be greater than or equal to the second The preset voltage threshold ⁇ , the switching module 6 is turned on, the first constant
  • the latter stage circuit specifically includes a serial to parallel conversion module 2, a first constant current control module 3, a second constant current control module 4, a third constant current control module 5, and a gate module 6
  • the serial-to-parallel conversion module 2 controls the first constant current control module 3 to be turned off.
  • the second constant current control module is also in an off state.
  • the voltage value of the AC power source AC may be 110V ⁇ 220V, that is, the input AC voltage may vary within 110V-220V, so that the LED linear constant current driving circuit realizes the application of the wide input voltage.
  • the output current of the first constant current control module 3 is adjusted by the serial-to-parallel conversion module 2, thereby adjusting the power of the first LED string 10, so that the input power of the subsequent stage circuit
  • the LED linear constant current driving circuit provided in this embodiment has a second filter capacitor C2 connected in parallel with the output end of the rectifier module 1, so that the first LED string 10 and the second LED string 20 can be made without frequency. flash.
  • FIG. 8 shows a circuit configuration of an LED linear constant current driving circuit according to a fourth embodiment of the present invention.
  • each module in the LED linear constant current driving circuit provided by this embodiment is completely the same as the circuit structure of each module in the LED linear constant current driving circuit provided by an embodiment.
  • the circuit structure of each module in the LED linear constant current driving circuit provided by an embodiment please refer to The related descriptions in the first embodiment corresponding to FIG. 2 and FIG. 2 are not described herein again.
  • the second LED string 20 is not subjected to constant current control.
  • the current flowing through the first LED string 10 and the second LED string 20 can be adjusted by adjusting the values of the first reference voltage Vref, the first resistor R1, and the second resistor R2, respectively.
  • the output voltage VIN of the rectifier module 1 rises above the first preset voltage threshold and continues to rise and is less than the second predetermined voltage threshold ⁇ , the output voltage VIN of the rectifier module 1 passes through the fourth resistor R4 and the fifth resistor R5.
  • the divided voltage VT is greater than the first reference voltage Vref, and the fourth switching transistor N4 is turned on.
  • the series-parallel conversion module 2 starts to adjust the input voltage of the first constant current control module 3, and then flows through the first LED.
  • the current II of the string 10 is adjusted.
  • the serial-parallel conversion module 2 outputs the same phase to the first operational amplifier EA1.
  • the output voltage VIN of the rectifier module 1 continues to rise to be greater than or equal to the second predetermined voltage threshold ⁇ , the output voltage VIN of the rectifier module 1 passes through the voltage divider VT of the fourth resistor R4 and the fifth resistor R5 is greater than or equal to the first The second reference voltage VR, the comparator Compl controls the fifth switch N5 to be turned on, the first switch N1 is turned off, the first constant current drive module 3 stops working, the diode D1 is turned on, and the rectifier module 1 is adjusted.
  • the voltage of the low potential terminal of the second bypass transistor N2 (the non-inverting input terminal of the second operational amplifier EA2) is greater than the first reference voltage Vref, therefore, The second operational amplifier EA2 outputs a low level, the second switching transistor N2 is turned off, and the second constant current control module 4 stops operating.
  • the embodiment of the present invention further provides an LED lighting device, which is connected to an alternating current power source and includes a first LED string and a second LED string.
  • the LED lighting device further includes the LED linear constant provided by any of the above embodiments. Stream drive circuit.
  • the LED linear constant current driving circuit includes a rectifier module, a serial-to-parallel conversion module, a first constant current driving module, a second constant current driving module, a third constant current driving module, and a switching module;
  • the output voltage of the rectifier module is less than or equal to the first preset voltage threshold ⁇ , the switch module is turned off, the first LED light string and the second LED light string are connected in parallel, and the first constant current control module and the second constant current control module respectively Constant current control of the first L ED string and the second LED string; when the output voltage of the rectifier module rises to be greater than the first
  • the preset voltage threshold continues to rise and is less than the second preset voltage threshold ⁇ , and the serial-to-parallel conversion module adjusts the output current of the first constant current control module, thereby performing constant power control on the input power of the subsequent circuit;
  • the output voltage continues to rise to be greater than or equal to the second predetermined voltage threshold ⁇ , the switching module is turned on, the first constant current

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  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

La présente invention porte sur un circuit d'attaque à courant constant linéaire destiné à une DEL et sur un appareil d'éclairage à DEL, comprenant un module redresseur (1), un module de conversion série-parallèle (2), un premier module de commande de courant constant (3), un deuxième module de commande de courant constant (4), un troisième module de commande de courant constant (5) et un module de commutation (6). Si une tension de sortie du module redresseur est inférieure ou égale à une première valeur seuil de tension prédéfinie, des premier et deuxième modules de commande de courant constant réalisent respectivement une commande de courant constant sur une première guirlande lumineuse à DEL (10) et sur une seconde guirlande lumineuse à DEL (20) connectées en parallèle ; si la tension de sortie du module redresseur augmente de façon à être supérieure à la première valeur seuil de tension prédéfinie, continue d'augmenter et est inférieure à une seconde valeur seuil de tension prédéfinie, le module de conversion série-parallèle commande le premier module de commande de courant constant de manière à effectuer une commande de puissance constante sur une puissance d'entrée d'un circuit d'étage arrière ; et si la tension de sortie du module redresseur augmente de façon à être supérieure ou égale à la seconde valeur seuil de tension prédéfinie, un troisième module de commande de courant constant effectue une commande de courant constant sur deux guirlandes lumineuses à DEL connectées en série, ce qui permet d'exécuter l'application d'une large tension d'entrée.
PCT/CN2017/083406 2016-11-24 2017-05-08 Circuit d'attaque à courant constant linéaire destiné à une del, et appareil d'éclairage à del WO2018094970A1 (fr)

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CN113453405A (zh) * 2021-07-16 2021-09-28 芯知微(上海)电子科技有限公司 一种led驱动电路及led灯具

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CN110505730B (zh) * 2018-05-18 2022-04-05 华润微集成电路(无锡)有限公司 线性led驱动电路及全电压输入的线性led驱动方法
CN108770132B (zh) * 2018-07-23 2023-11-03 深圳市明微电子股份有限公司 Led全电压高效率线性驱动电路
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CN211557552U (zh) * 2019-06-06 2020-09-22 上海路傲电子科技有限公司 一种芯片驱动电路、芯片、线性恒流驱动电路及照明装置
WO2020250076A1 (fr) * 2019-06-12 2020-12-17 Shinobu Sekkei Co., Ltd. Dispositif d'éclairage à del et circuit d'attaque de del

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CN113453405A (zh) * 2021-07-16 2021-09-28 芯知微(上海)电子科技有限公司 一种led驱动电路及led灯具

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