WO2017207405A1 - Circuit d'attaque de diode électroluminescente commandé par microprocesseur - Google Patents

Circuit d'attaque de diode électroluminescente commandé par microprocesseur Download PDF

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Publication number
WO2017207405A1
WO2017207405A1 PCT/EP2017/062654 EP2017062654W WO2017207405A1 WO 2017207405 A1 WO2017207405 A1 WO 2017207405A1 EP 2017062654 W EP2017062654 W EP 2017062654W WO 2017207405 A1 WO2017207405 A1 WO 2017207405A1
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WIPO (PCT)
Prior art keywords
driving circuit
light emitting
emitting diode
output
diode driving
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2017/062654
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English (en)
Inventor
Yuhong Fang
Bernd Clauberg
Harshitha GUDIPATI
Mark CIOLEK
George Gruev
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Signify Holding BV
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Philips Lighting Holding BV
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Publication of WO2017207405A1 publication Critical patent/WO2017207405A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/382—Switched mode power supply [SMPS] with galvanic isolation between input and output
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • 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
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • 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
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]

Definitions

  • the present disclosure relates to the field of light emitting diode (LED) driving circuits. More particularly, the present disclosure relates to a microprocessor in a light emitting diode driving circuit that detects faults/fault conditions.
  • LED light emitting diode
  • a typical light emitting diode driving circuit outputs current, voltage and power for loads imposed by one or more light emitting diodes.
  • a light emitting diode driving circuit can be classified as a UL Class 2 LED Driver so long as the light emitting diode driving circuit complies with the UL 1310 standard for "Class 2 Power Units".
  • conventional light emitting diode driving circuit includes circuitry designed to output current, voltage and power close to UL Class 2 LED Driver limits.
  • the invention proposes a driving method and a driving circuit compliant with UL 1310 standard.
  • a primary section is insulated from an output section.
  • a primary control circuit placed in the primary section controls the output level.
  • microprocessor in the output section is used for fault detection and for reporting a detected fault to the primary control circuit through an insulating link.
  • Figure 1 shows an exemplary electronic device that includes a microprocessor controlled light emitting diode driving circuit, according to an aspect of the present disclosure
  • Figure 2 shows an exemplary microprocessor controlled light emitting diode driving circuit, according to an aspect of the present disclosure
  • Figure 3 shows an exemplary process for a microprocessor controlled light emitting diode driving circuit, according to an aspect of the present disclosure
  • Figure 4 shows another exemplary microprocessor controlled light emitting diode driving circuit, according to an aspect of the present disclosure.
  • Figure 5 shows another exemplary process for a microprocessor controlled light emitting diode driving circuit, according to an aspect of the present disclosure.
  • the present disclosure describes a microprocessor programmed logically to protect a light emitting diode driving circuit, so that, for example, a single fault mechanism for protecting the driving circuit can be detected by the microprocessor.
  • the driving circuit may include a primary control section and an output section isolated from the primary control section.
  • the driving circuit may be designed to comply with UL Class 2 LED Driver requirements, and can help ensure that output parameters of the driving circuit consistently meet such requirements.
  • the microprocessor may also provide features such as power computation, to help ensure protection of circuit components in a high power environment.
  • a microprocessor described herein may also be, for example, a microprocessor chip, a controller, or a micro-controller, or a digital signal microprocessor (DSP).
  • Figure 1 shows an exemplary electronic device that includes a microprocessor controlled light emitting diode driving circuit, according to an aspect of the present disclosure.
  • a microprocessor in the microprocessor controlled light emitting diode driving circuit provides for supervision and protection of output current, output voltage and output power.
  • the microprocessor can also provide for output current control (regulation), and output power control (regulation).
  • the electronic device 10 includes a microprocessor controlled light emitting diode driving circuit 100 and light emitting diodes 199.
  • the microprocessor controlled light emitting diode driving circuit 100 includes a primary control section 100a and an output section 100b which is isolated from the primary control section 100a.
  • the output section is the portion of the driving circuit which provides power to a load.
  • the microprocessor controlled light emitting diode driving circuit 100 may be configured and operable to comply with UL Class 2 LED Driver requirements.
  • isolation elements 110 and 190 are provided to isolate the primary control section 100a from the output section 100b.
  • Isolation elements may include isolation transformers, opto-couplers, and other types of elements that can be used to isolate two sections, elements, or pieces of an element, from one another.
  • the isolation provided by isolation elements 110 and 190 is not absolute, and instead may be an electrical isolation in one or more aspects.
  • an isolation transformer prevents current from flowing between two opposing sides.
  • an opto-coupler transfers a signal using light, and prevents transfer shocks from, for example, high voltages.
  • the output section 100b generally includes circuitry for providing power, voltage and current as output so as to drive the light emitting diode(s) 199.
  • the output section 100b also includes mechanisms for detecting levels of the power, voltage and current provided as output, so as to provide feedback to the primary control section 100a.
  • the primary control section 100a generally provides primary control for the driving circuit 100 in driving the light-emitting diode(s).
  • the primary control section 100a uses input power, voltage and current in order to start the driving circuit 100.
  • the primary control section 100a also accepts feedback from the output section 100b in order to make adjustments to power, voltage and current that will be output from the output section 100b in order to drive the light emitting diode(s) 199.
  • the individual circuit components of the microprocessor controlled light emitting diode driving circuit are not shown except for isolation elements 110 and 190.
  • the microprocessor described herein is not shown in Figure 1.
  • the microprocessor described herein is included in the output section 100b, and is isolated from the primary control section 100a in at least one aspect.
  • the electronic device 10 is illustrative of devices that incorporate light emitting diodes and light emitting diode driving circuits, including light emitting diode driving circuits that comply with UL Class 2 LED Driver requirements.
  • Such devices include lighting fixtures, entertainment displays, communications devices, and more.
  • Such devices can also include electronic devices with memory and additional microprocessors beyond the microprocessor specific to the output section 100b of the driving circuit 100.
  • Such devices may operate as standalone devices or may be connected, for example, using a network, to other devices or systems.
  • the electronic device 10 can be incorporated as or in a particular device that in turn is in an integrated system that includes additional devices.
  • the electronic device 10 can be implemented using electronic devices that provide voice, video or data communication.
  • the electronic device 10 may be included in a "system" that includes any collection of systems or sub-systems that individually or jointly execute a set, or multiple sets, of instructions to perform one or more computer software functions.
  • a microprocessor as described herein is tangible and non-transitory. As used herein, the term “non-transitory” is to be interpreted not as an eternal characteristic of a state, but as a characteristic of a state that will last for a period of time. The term “non-transitory” specifically disavows fleeting characteristics such as characteristics of a particular carrier wave or signal or other forms that exist only transitorily in any place at any time.
  • a microprocessor is an article of manufacture and/or a machine component.
  • a microprocessor for an electronic device 10 is configured to execute software instructions in order to perform functions as described in the various embodiments herein.
  • a microprocessor for an electronic device 10 may be a general purpose microprocessor or may be part of an application specific integrated circuit (ASIC). Additionally, any microprocessor described herein may include multiple microprocessors, parallel microprocessors, or both. Multiple microprocessors may be included in, or coupled to, a single device or multiple devices.
  • the electronic device 10 may include storage such as a memory.
  • Memories described herein are tangible storage mediums that can store data and executable instructions, and are non-transitory during the time instructions are stored therein.
  • a memory described herein is an article of manufacture and/or machine component.
  • Memories described herein are computer-readable mediums from which data and executable instructions can be read by a processor.
  • Memories as described herein may be random access memory (RAM), read only memory (ROM), flash memory, electrically programmable read only memory (EPROM), electrically erasable programmable read-only memory
  • EEPROM electrically erasable read-only memory
  • registers or any other form of storage medium known in the art. Memories may be volatile or non-volatile, secure and/or encrypted, unsecure and/or unencrypted.
  • the electronic device 10 may include a computer- readable medium in which one or more sets of instructions, for example, software, can be embedded. Sets of instructions can be read from the computer-readable medium. Further, the instructions, when executed by a microprocessor, can be used to perform one or more of the methods and processes as described herein. In a particular embodiment, the instructions may reside completely, or at least partially, within a separate memory, and/or within the microprocessor during execution by the electronic device 10.
  • dedicated hardware implementations such as application-specific integrated circuits (ASICs), programmable logic arrays and other hardware components, can be constructed to implement one or more of the methods described herein.
  • ASICs application-specific integrated circuits
  • One or more embodiments described herein may implement functions using two or more specific interconnected hardware modules or devices with related control and data signals that can be communicated between and through the modules. Accordingly, the present disclosure encompasses software, firmware, and hardware implementations. None in the present application should be interpreted as being implemented or
  • the methods described herein may be implemented using a microprocessor that executes software programs. Further, in an exemplary, non-limited embodiment, implementations can include distributed processing, component/object distributed processing, and parallel processing.
  • FIG. 2 shows an exemplary microprocessor controlled light emitting diode driving circuit, according to an aspect of the present disclosure.
  • input power is provided to a power factor correction (PFC) stage 206 of the driving circuit 200 through an electromagnetic interference (EMI) filter 202 and a diode bridge 204.
  • the power factor correction stage 206 is controlled by a power factor correction control 230, and corrects input power levels in accordance with the control of the power factor correction control 230.
  • the EMI filter 202 removes interference presented with the input power.
  • the diode bridge 204 can be used to convert alternating current to direct current.
  • a resonant converter 208 is used to adjust voltage or current gains using a switching frequency. The adjustments are used to regulate the output voltage or current.
  • a PWM converter can be used in lieu of the resonant converter.
  • an output filter 216 filters output from the driving circuit 200.
  • the output from output filter 216 is provided via a rectifier 214 which converts alternating current to direct current.
  • the rectifier 214 also outputs an operational frequency F when the driving circuit 200 includes a resonant converter 208, or a duty cycle when the driving circuit 200 includes a PWM converter in lieu of the resonant converter 208.
  • a current feedback 220 detects the output current and provides the detected current as feedback to a primary control 232 through opto-coupler 290a.
  • a voltage feedback 222 detects the output voltage and provides the detected voltage as feedback to primary control 232 through opto-coupler 290a.
  • a microprocessor of the microprocessor controlled light emitting diode driving circuit is a microcontroller 240.
  • the microcontroller 240 provides for voltage and current feedback as well as power limitation.
  • the microcontroller 240 measures output current and output voltages.
  • the microcontroller 214 also obtains the frequency F or duty cycle from the rectifier 214.
  • the microcontroller 240 also measures frequency when the driving circuit 200 includes a resonant converter 208.
  • the microcontroller 240 measures duty cycle when the driving circuit 200 includes a PWM converter in lieu of a resonant converter 208.
  • the microcontroller 240 also obtains the output current and voltage, and can analyze output current, output voltage, and frequency F or duty cycle, and set output current settings or trigger protection based on the analysis.
  • the output current settings or protection triggers are provided from the microcontroller 240 to a primary control 232 through an opto- coupler 290b.
  • the primary control 232 may include a processor that executes instructions similar to the microcontroller 240.
  • the resonant converter 208 adjusts voltage or current gains in accordance with instructions from primary control 232.
  • the primary control 232 receives output feedback from current feedback 220 and voltage feedback 222, as well as results of analysis (e.g., the current output setting and/or the protection triggers) from the microcontroller 240.
  • the outback feedback is received by the primary control 232 via opto- coupler 290a.
  • the analysis results are received by the primary control 232 via the opto- coupler 290b.
  • the instructions from the primary control 232 based on current feedback and voltage feedback can be used to make voltage adjustments or current adjustments at the resonant converter 208.
  • the instructions from the primary control 232 based on the analysis results are received by the resonant converter and can be used to set output current or to trigger protection.
  • the microcontroller 240 sets output current settings and detects faults based on, for example, the output current and/or output voltage and/or frequency or duty cycle.
  • the operations of microcontroller 240 in Figure 2 are described further with respect to Figure 3 below. As an example, protection can be triggered by the
  • microcontroller when the measured voltage indicates an open circuit or short circuit, as the measured voltage will be out of a predetermined range. Similarly, if power is higher than a maximum rated power, protection can be triggered by the microcontroller 240. Additional protections provided directly from sensing currents are explained below with respect to Figure 3.
  • PFC control and primary control are all elements of a primary control section of the driving circuit 200.
  • the rectifier 214, output filter 216, current feedback 220, voltage feedback 222, and microcontroller 240 are all elements of an output section of the driving circuit 200.
  • the primary control section and the output section of a driving circuit are isolated from one another in at least one aspect.
  • input current is isolated by the isolation transformer 210, and output such as Vout is isolated from the primary control 232 by opto-couplers 290a and 290b.
  • the microcontroller 240 is provided in the output section of the driving circuit 200, and is isolated from the primary control section in at least one aspect.
  • Figure 3 shows an exemplary process for a microprocessor controlled light emitting diode driving circuit, according to an aspect of the present disclosure.
  • UL Class 2 LED Driver limits can be met using the microprocessor controlled light emitting diode driving circuit 200 in Figure 2.
  • an operating frequency F is obtained by the microcontroller 240 at S302 from the rectifier 214.
  • the duty cycle of the PWM converter is obtained by the microprocessor instead of the operating frequency F. In either case, the operating frequency F or duty cycle can be used to trigger current protection.
  • An output voltage Vout is obtained at S304.
  • An output current is obtained at S304.
  • an initial determination is made using the output current lout and the output voltage Vout.
  • the microcontroller 240 can measure the output current lout, and when the measured output current lout is out of a predetermined range and the parameters for frequency or duty cycle are met, protection can be triggered.
  • the process next compares output voltage Vout with a predetermined range to make sure the output voltage Vout is within the predetermined range. That is, when the driving circuit 200 includes a broken or shorted isolation transformer or current sensing resistor, the determinations at S320 or S330 will operate to detect the fault. Therefore, even when the resonant converter operates at low frequency or the PWM converter operates at a high duty cycle, the driving circuit 200 will detect the broken or shorted elements at S320 or S33o using the
  • microcontroller 240 As the microcontroller 240 measures the current and frequency or duty cycle, protection will be triggered if current sensing is low and at same time operating frequency is low for a resonant converter or duty cycle is high for a PWM converter.
  • the process returns to a normal routine at S360. That is, if the microcontroller does not output a current setting at S315 or trigger protection at S335, S345 or S365, the process routines to a normal routine, as no fault is detected.
  • Figure 4 shows another exemplary microprocessor controlled light emitting diode driving circuit, according to an aspect of the present disclosure.
  • elements similar or identical to the elements in Figure 2 are labeled with similar numbers and labels.
  • the microprocessor 440 fully controls the output section of the microprocessor controlled light emitting diode driving circuit 400.
  • the EMI filter 402, diode bridge 404, PFC 406, resonant converter 408, PFC control 430, and primary control 432 are all elements of a primary control section of the driving circuit 400.
  • the rectifier 4214, output filter 416, and microcontroller 440 are all elements of an output section of the driving circuit 400.
  • the primary control section and the output section of a driving circuit are isolated from one another in at least one aspect.
  • input current is isolated by the isolation transformer 410, and output such as Vout is isolated from the primary control 432 by opto-couplers 490a and 490b.
  • the microcontroller 440 is provided in the output section of the driving circuit 400, and is isolated from the primary control section in at least one aspect.
  • the driving circuit 400 does not have a current feedback 220 or voltage feedback 222.
  • the microcontroller 440 may possess all capabilities as the microcontroller 240 in Figure 2.
  • the microcontroller 440 also renders the current feedback 220 and voltage feedback 222 moot, by assuming control for regulating the outputs from the driving circuit 400.
  • FIG 4 current feedback and voltage feedback in Figure 2 are provided by the microcontroller 440.
  • the microcontroller 440 replaces all hardware control circuits in the output section of the driving circuit 400 after the output filter 416.
  • the microcontroller 440 measures or otherwise obtains output current, output voltage, and switching frequency for a resonant converter or duty cycle for a PWM converter.
  • Figure 5 shows another exemplary process for a microprocessor controlled light emitting diode driving circuit, according to an aspect of the present disclosure.
  • the process in Figure 5 can be performed using instructions executed by the microcontroller 440 shown in Figure 4.
  • the microprocessor obtains output voltage Vout at S504, obtains output current lout at S506, and obtains maximum rated power Pmax at S508.
  • the Vout and lout are obtained dynamically based on real-time or near-real-time readings.
  • Pmax is a set value stored, for example, in memory, and does not change.
  • the microcontroller 440 obtains three comparable values for use in output control at S510, S515 and S520, as follows. At S510, the microcontroller 440 identifies a frequency necessary to obtain the current setting using the output current lout. At S515, the microcontroller 440 identifies a frequency necessary to obtain the current setting using the output voltage Vout. At S520, the microcontroller 440 identifies a frequency necessary to obtain the current setting using the power limit Pmax and output voltage Vmax by
  • the microcontroller 440 calculates the maximum operating frequency among the values identified at S510, S515 and S520, assuming that the driving circuit 400 includes a resonant converter 408.
  • the microcontroller 440 calculates a required duty cycle for the current settings at S510, S515 and S520, and a minimum duty cycle among the three at S530.
  • the maximum operating frequency or minimum duty cycle is then used to control the output settings in the embodiments of Figure 4 and 5. That is, the current is set according to a maximum operating frequency or minimum duty cycle identified by the microprocessor 440 in the driving circuit 400.
  • the driving circuit is used in "normal" operation to regulate output, and not only to identify faults as described separately with respect to the embodiments of Figures 2 and 3.
  • the values identified at S510 and S515 can be obtained through compensation calculation. Compensation calculations include proportional-integral- derivative control (PID control).
  • PID control proportional-integral- derivative control
  • a microprocessor in a light emitting diode driving circuit can be used to both detect faults and regulate current.
  • Such a microprocessor is useful can be used even when driving circuits are designed to output power very close to limits such as those imposed under the UL Class 2 LED Driver standards.
  • limits such as those imposed under the UL Class 2 LED Driver standards.
  • microprocessor controlled light emitting diode driving circuit has been described with reference to several exemplary embodiments, it is understood that the words that have been used are words of description and illustration, rather than words of limitation. Changes may be made within the purview of the appended claims, as presently stated and as amended, without departing from the scope and spirit of the microprocessor controlled light emitting diode driving circuit in its aspects. Although the microprocessor controlled light emitting diode driving circuit has been described with reference to particular means, materials and embodiments, the microprocessor controlled light emitting diode driving circuit is not intended to be limited to the particulars disclosed; rather the
  • microprocessor controlled light emitting diode driving circuit extends to all functionally equivalent structures, methods, and uses such as are within the scope of the appended claims.
  • a resonant converter may be replaced with a PWM converter such that calculations by the microcontrollers 240 and 440 will differ depending on which converter is used.
  • the disclosure references UL Class 2 LED Drivers in several places; however, requirements imposed by other standards may also be met using a microcontroller isolated in a section of a circuit as described herein.
  • a hardware design for light emitting diode driving circuits close to Class 2 limit is unnecessarily complex and costly.
  • An isolated microprocessor described herein achieves Class 2 requirements and can save space in the driver circuit and in an electronic device. Accordingly, the light emitting diode driving circuit can be smaller and lower cost.
  • While a computer-readable medium is described generally as a single medium, the term “computer-readable medium” includes a single medium or multiple media that store one or more sets of instructions.
  • the term “computer-readable medium” shall also include any medium that is capable of storing, encoding or carrying a set of instructions for execution by a microprocessor or that cause a computer system to perform any one or more of the methods or operations disclosed herein.
  • inventions of the disclosure may be referred to herein, individually and/or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any particular invention or inventive concept.
  • inventions may be referred to herein, individually and/or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any particular invention or inventive concept.
  • specific embodiments have been illustrated and described herein, it should be appreciated that any subsequent arrangement designed to achieve the same or similar purpose may be substituted for the specific embodiments shown.
  • This disclosure is intended to cover any and all subsequent adaptations or variations of various embodiments. Combinations of the above embodiments, and other embodiments not specifically described herein, will be apparent to those of skill in the art upon reviewing the description.
  • a light emitting diode driving circuit includes a primary control section and an output section isolated from the primary control section.
  • a method of detecting faults in the light emitting diode driving circuit includes obtaining an output level of the light emitting diode driving circuit. The method also includes comparing, by a microprocessor in the output section, the output level of the light emitting diode driving circuit with a predetermined threshold level. When the output level of the light emitting diode does not meet the predetermined threshold level, the method includes identifying by the microprocessor a fault in the light emitting diode driving circuit based on the comparing with the predetermined threshold level.
  • the predetermined threshold level and comparing are in accordance with UL Class 2 requirements for light emitting diode driving circuits.
  • the predetermined threshold level is set under a UL Class 2 requirement including a single fault condition.
  • the method includes obtaining one of a frequency of a resonant converter or a duty cycle of a pulse width modulation (PWM) converter.
  • the obtained frequency or duty cycle is compared with another predetermined threshold.
  • the identifying of the fault includes identifying a current sensing fault by the microprocessor and is further based on the comparing with the other predetermined threshold.
  • the output level includes at least one of a power output level of the light emitting diode driving circuit, a voltage output level of the light emitting diode driving circuit, and a current output level of the light emitting diode driving circuit.
  • the method also includes calculating power output of the light emitting diode driving circuit based on a voltage output level of the light emitting diode driving circuit and a current output level of the light emitting diode driving circuit. In the absence of an identified fault the
  • microprocessor regulates the power output of the light emitting diode driving circuit by comparing the calculated power output with a rated maximum power. Protection for the light emitting diode driving circuit is triggered when the calculated power output is higher than the rated maximum power.
  • the microprocessor is isolated from the primary control section of the light emitting diode driving circuitA
  • the output level is of an output current and the fault is a current sensing fault.
  • the current sensing fault can be detected by measuring the output current and operating frequency of a resonant converter or a duty cycle of a pulse width modulation (PWM) converter, and comparing the measured output current to a first predetermined range and comparing either the operating frequency or the duty cycle to a second predetermined range.
  • PWM pulse width modulation
  • the microprocessor is included as a component of the output portion.
  • the output level corresponds to an output provided to a load of the light emitting diode.
  • the output level includes a power output level provided to a load of the light emitting diode.
  • the method includes regulating, using the tangible microprocessor, conditions of the light emitting diode driving circuit.
  • the conditions include at least one of a power output of the light emitting diode driving circuit, a voltage output of the light emitting diode driving circuit, and a current output of the light emitting diode driving circuit.
  • a light emitting diode driving circuit includes a primary control section and an output section isolated from the primary control section.
  • the light emitting diode driving circuit also includes a memory that stores instructions for detecting faults in the light emitting diode driving circuit; and a
  • the microprocessor in an output section that executes the instructions.
  • the instructions When executed by the microprocessor, the instructions cause the light emitting diode driving circuit to perform a process that includes obtaining an output level of the light emitting diode driving circuit.
  • the output level of the light emitting diode driving circuit is compared with a predetermined threshold level.
  • the process includes identifying a fault in the light emitting diode driving circuit based on the comparing.
  • a microprocessor is in an output section of a light emitting diode driving circuit with a primary control section and the output section isolated from the primary control section.
  • the microprocessor is operable to execute instructions to detect faults in the light emitting diode driving circuit.
  • the instructions When executed by the microprocessor, the instructions cause the light emitting diode driving circuit to perform a process that includes obtaining an output level of the light emitting diode driving circuit.
  • the process also includes comparing the output level of the light emitting diode driving circuit with a predetermined threshold level. When the output level of the light emitting diode does not meet the predetermined threshold level, the process includes identifying a fault in the light emitting diode driving circuit based on the comparing.
  • the light emitting diode driving circuit also includes a separate circuit that controls output current of the light emitting diode driving circuit and that controls output voltage of the light emitting diode driving circuit.
  • the microprocessor also performs a process comprising controlling current output of the light emitting diode driving circuit in the absence of an identified fault and controlling voltage output of the light emitting diode driving circuit in the absence of an identified fault.
  • Class 2 light emitting diode driving circuits are provided with a micro-processor that can provide a variety of uses including fault detection and power regulation.
  • UL Class 2 light emitting diode driving circuits generally solve isolation issue that existed in conventional light emitting diode driving circuits by providing the isolation elements shown in the Figures and described herein.
  • the UL Class 2 standard sets requirements for output current, output voltage and output power.
  • a logically programmed micro-processor can be provided in an electrical hardware circuit, and used to detect even single fault conditions so that outputs in normal use can be very close to UL Class 2 limits.

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Abstract

La présente invention concerne un circuit d'attaque de diode électroluminescente (DEL) comprenant une section de commande principale et une section de sortie isolée de la section de commande principale. Un procédé de détection de défauts dans le circuit d'attaque comprend l'obtention d'un niveau de sortie du circuit d'attaque. Le procédé comprend également la comparaison, par un microprocesseur dans la section de sortie, du niveau de sortie du circuit d'attaque de DEL à un niveau seuil prédéterminé. Lorsque le niveau de sortie (5) de la DEL n'atteint pas le niveau seuil prédéterminé, le procédé comprend l'identification, par le microprocesseur, d'un défaut dans le circuit d'attaque de DEL sur la base de la comparaison au niveau seuil prédéterminé.
PCT/EP2017/062654 2016-06-01 2017-05-24 Circuit d'attaque de diode électroluminescente commandé par microprocesseur Ceased WO2017207405A1 (fr)

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Application Number Priority Date Filing Date Title
US201662343977P 2016-06-01 2016-06-01
US62/343,977 2016-06-01
EP16175859.4 2016-06-23
EP16175859 2016-06-23

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10616971B1 (en) 2018-10-17 2020-04-07 Appleton Grp Llc LED auto-detect system for wide output voltage range LED drivers

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WO2020081341A1 (fr) * 2018-10-17 2020-04-23 Appleton Grp Llc Système d'auto-détection de del pour pilotes de del à large plage de tension de sortie

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