# US 2014/0152192 A1 · Power supply apparatus for led lighting and led lighting apparatus using the power supply apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0152192 A1 - Document ID: US20140152192A1 - Status: Published application - Kind: A1 - Application number: 14/094,386 - Filed: 2013-12-02 - Published: 2014-06-05 - Earliest claimed: 2012-11-30 - Assignees: Silicon Works Co., Ltd. - Applicants: Silicon Works Co., Ltd. - Inventors: Yong Guen KIM - Web page: https://patentgrep.com/patent/US20140152192A1 ## CPC - H05B 45/14: using electrical feedback from LEDs or from LED modules - H05B 45/12: using optical feedback - H05B 45/3725: Switched mode power supply [SMPS] - H05B 45/385: using flyback topology - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL ## Abstract Disclosed are a power supply apparatus for an LED lighting and an LED lighting apparatus using the power supply apparatus. The LED lighting apparatus includes a power source unit configured to supply a rectified voltage, a voltage converter configured to include at least one first inductor and to convert the rectified voltage, an auxiliary coil configured to include a second inductor and to supply a detection voltage corresponding to the current of the first inductor of the voltage converter, a controller configured to control the current of the voltage converter using a driving pulse generated in response to a control signal and a sensing voltage, and a voltage regulation circuit configured to regulate the detection voltage and to supply the regulated voltage as an operating voltage for the controller. ## Claims ### Claim 1 A power supply apparatus for an LED lighting, comprising: a power source unit configured to supply a rectified voltage; a voltage converter configured to comprise at least one first inductor and to convert the rectified voltage; an auxiliary coil configured to comprise a second inductor and to supply a detection voltage corresponding to current of the first inductor of the voltage converter; a controller configured to control current of the voltage converter using a driving pulse generated in response to a control signal and a sensing voltage; and a voltage regulation circuit configured to regulate the detection voltage and to supply the regulated voltage as an operating voltage for the controller, wherein the control signal controls a dimming of an LED lighting, and the sensing voltage is voltage fed back after sensing the current of the voltage converter. ### Claim 2 (depends on 1) The power supply apparatus of claim 1, wherein a winding ratio of the first inductor and the second inductor is set so that the detection voltage is included in a driving voltage region of the LED lighting. ### Claim 3 (depends on 2) The power supply apparatus of claim 2, wherein: the driving voltage region is defined as a first voltage and a second voltage lower than the first voltage, and the winding ratio is set so that the detection voltage is outputted as the second voltage. ### Claim 4 (depends on 2) The power supply apparatus of claim 2, wherein: the driving voltage region is defined as a first voltage and a second voltage lower than the first voltage, and the winding ratio is set so that the detection voltage is outputted as the first voltage. ### Claim 5 (depends on 2) The power supply apparatus of claim 2, wherein: the driving voltage region is defined as a first voltage and a second voltage lower than the first voltage, and the winding ratio is set so that the detection voltage is outputted as a middle voltage between the first voltage and the second voltage. ### Claim 6 (depends on 1) The power supply apparatus of claim 1, wherein the auxiliary coil is configured in the voltage converter. ### Claim 7 (depends on 1) The power supply apparatus of claim 1, wherein the auxiliary coil is combined with the voltage converter in a non-separation or separation way. ### Claim 8 (depends on 1) The power supply apparatus of claim 1, wherein the control signal is provided as an analog signal or a PWM signal. ### Claim 9 (depends on 1) The power supply apparatus of claim 1, wherein the voltage regulation circuit comprises: a constant voltage circuit configured to supply a constant voltage in response to the detection voltage; and a DC-DC regulator driven by the constant voltage and configured to change an upper limit of the detection voltage so that the upper limit satisfies an allowable range of the operating voltage and to supply the changed voltage as the operating voltage. ### Claim 10 (depends on 9) The power supply apparatus of claim 9, wherein the constant voltage circuit comprises a zener diode. ### Claim 11 (depends on 9) The power supply apparatus of claim 9, wherein the DC-DC regulator comprises an NPN transistor having a collector and a base coupled through a resistor. ### Claim 12 (depends on 1) The power supply apparatus of claim 1, wherein the controller comprises: a dimming control circuit configured to convert an external control signal for controlling dimming into a dimming control signal having a DC component; a Zero Current Detection circuit configured to detect a zero current point of current outputted from the auxiliary coil and to output a ZCD signal corresponding to the zero current point; a switching element switched in response to the driving pulse and configured to drive a flow of the current of the voltage converter; a sensing element connected to the switching element and configured to provide the sensing voltage by sensing a flow of current of the switching element; and a flyback controller driven by the operating voltage and configured to supply the switching element with the driving pulse having a pulse width determined in response to the dimming control signal and the sensing voltage, wherein a point of time at which the driving pulse is started is synchronized with the zero current point in response to the ZCD signal. ### Claim 13 (depends on 1) The power supply apparatus of claim 1, further comprising a sensor board configured to operate in response to an output of the voltage converter and to supply the control signal for controlling the dimming of the LED lighting. ### Claim 14 An LED lighting apparatus, comprising: an LED lighting; a sensor board configured to provide a control signal for controlling a dimming of the LED lighting; and a power supply apparatus configured to comprise a power source unit configured to supply a rectified voltage, a voltage converter configured to comprise at least one first inductor and to convert the rectified voltage, an auxiliary coil configured to comprise a second inductor and to supply a detection voltage corresponding to current of the first inductor of the voltage converter, a controller configured to control current of the voltage converter using a driving pulse generated in response to a control signal and a sensing voltage fed back after sensing the current of the voltage converter, and a voltage regulation circuit configured to regulate the detection voltage and to supply the regulated voltage as an operating voltage for the controller and to supply a power to the LED lighting and a sensor board. ### Claim 15 (depends on 14) The LED lighting apparatus of claim 14, further comprising a startup circuit configured to detect a startup current supplied from the power source unit to the voltage converter in an initial state in which AC power starts being supplied and to supply the operating voltage to the controller. ### Claim 16 (depends on 14) The LED lighting apparatus of claim 14, wherein a winding ratio of the first inductor and the second inductor is set so that the detection voltage is included in a driving voltage region of the LED lighting. ### Claim 17 (depends on 16) The LED lighting apparatus of claim 16, wherein: the driving voltage region is defined as a first voltage and a second voltage lower than the first voltage, and the winding ratio is set so that the detection voltage is outputted as the second voltage. ### Claim 18 (depends on 16) The LED lighting apparatus of claim 16, wherein: the driving voltage region is defined as a first voltage and a second voltage lower than the first voltage, and the winding ratio is set so that the detection voltage is outputted as the first voltage. ### Claim 19 (depends on 16) The LED lighting apparatus of claim 16, wherein: the driving voltage region is defined as a first voltage and a second voltage lower than the first voltage, and the winding ratio is set so that the detection voltage is outputted as a middle voltage between the first voltage and the second voltage. ### Claim 20 (depends on 14) The LED lighting apparatus of claim 14, wherein the auxiliary coil is combined with the voltage converter in a non-separation or separation way.