JP6002717B2 - LED lamp - Google Patents

Description

  The present invention relates to an LED lamp, for example, an LED lamp that can be attached to an existing fluorescent lamp illumination device.

  In recent years, LED (Light Emitting Diode) lamps have been proposed and gradually spread as a means for reducing power consumption and extending the life of light bulbs. On the other hand, existing fluorescent lamp illumination devices (instruments) are still used in general households, and it is said that a considerable period is required to replace the LED illumination devices using LED lamps. Therefore, it is considered to use an LED lamp instead of the fluorescent lamp of the existing fluorescent lamp illumination device. In this case, the ballast of the fluorescent lamp illumination device is removed, the LED driver is connected, and then the LED lamp is wired. Then, an alternating current is supplied to the LED driver, and the alternating current is converted into a direct current. This direct current is supplied to the LED lamp so that the LED lamp operates.

  However, removing the ballast of the fluorescent lamp illumination device requires a construction work by a contractor. If an attempt is made to operate the LED lamps in all the fluorescent lamp illumination devices in one household, the construction cost becomes considerably high.

  For this reason, it is desired that the LED lamp can be operated with the existing fluorescent lamp illumination device without performing the work for removing the ballast. For example, Patent Document 1 discloses that an LED lamp can be connected to a fluorescent lamp illumination device without converting the alternating current output of the ballast into direct current.

JP 2008-282793 A

  However, in Patent Literature 1, since the resonance capacitor provided in the fluorescent lamp illumination device is energized, there is a risk that an initial voltage for operating the fluorescent lamp may be generated. Since this initial voltage is considerably higher than the operating voltage of the LED lamp, there is a high possibility that the LED power source will fail. Although the possibility of failure can be reduced by using an LED power supply that can withstand high voltages, it will increase the price of the LED lamp itself.

  Therefore, it is desirable that the LED lamp can be operated without generating the initial voltage even when the LED lamp is mounted on an existing fluorescent lamp illumination device.

  The present invention has been made in view of such a situation, and provides an LED lamp that operates safely and stably even when attached to an existing fluorescent lamp illumination device.

  In order to solve the above-described problems, the present invention provides an LED lamp that can be attached to a fluorescent lamp luminaire. The LED lamp has an LED power supply circuit that converts an alternating current input from a fluorescent lamp lighting device into a direct current and outputs the direct current, and at least one LED element. And an LED module. Further, the LED power supply circuit has a pseudo heater circuit for providing impedance in addition to a general LED power supply circuit. This pseudo heater circuit is a resonance capacitor included in a fluorescent lamp lighting apparatus (inverter), and supplies an AC input to the AC / DC conversion circuit without functioning the resonance capacitor for generating the initial voltage. At the same time, the AC input is fed back to the fluorescent lamp lighting device (inverter).

  Further features related to the present invention will become apparent from the description of the present specification and the accompanying drawings. The aspects of the present invention can be achieved and realized by elements and combinations of various elements and the following detailed description and appended claims.

  It should be understood that the description herein is merely exemplary and is not intended to limit the scope of the claims or the application of the invention in any way.

  According to the LED lamp of the present invention, since the generation of the initial voltage can be suppressed, it is possible to provide an LED lamp that operates safely and stably even when mounted on an existing fluorescent lamp illumination device. .

It is a figure which shows the functional block structure of the LED lamp by embodiment of this invention. It is a figure which shows the specific circuit structural example of the LED power supply circuit which comprises the LED lamp by embodiment of this invention.

  The present invention, for example, suppresses generation of a high-voltage initial voltage by not causing a resonance capacitor to function even when an LED lamp is attached to an existing fluorescent lamp illumination device instead of a fluorescent lamp, The present invention relates to a technique for supplying a direct current to the LED lamp and operating the LED lamp stably and safely.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the accompanying drawings, functionally identical elements may be denoted by the same numbers. The attached drawings show specific embodiments and implementation examples based on the principle of the present invention, but these are for understanding the present invention and are not intended to limit the present invention. Not used.

  This embodiment has been described in sufficient detail for those skilled in the art to practice the present invention, but other implementations and configurations are possible without departing from the scope and spirit of the technical idea of the present invention. It is necessary to understand that the configuration and structure can be changed and various elements can be replaced. Therefore, the following description should not be interpreted as being limited to this.

<Basic configuration of LED lamp>
FIG. 1 is a block diagram showing a configuration of an LED lamp according to an embodiment of the present invention. The LED lamp 100 includes an LED power supply circuit 101 and an LED module 102.

  The LED power supply circuit 101 includes a pseudo heater circuit 1011, a rectifier circuit 1012, a smoothing circuit 1013, a control circuit 1014, and a gate circuit 1015. In the power supply circuit 101, circuits other than the pseudo heater circuit 1011 have the same configuration as a general LED power supply circuit included in a conventional LED lamp.

  The simulated heater circuit 1011 receives an AC input (AC voltage / current) from the inverter 201 included in the fluorescent lamp illumination device, provides an AC output to the rectifier circuit 1012, and returns the AC output to the inverter 201. By returning the AC output, the inverter 201 recognizes that the fluorescent tube is connected, and continues to supply the AC output. When a general fluorescent tube is connected to the inverter 201, an alternating current flows into a resonance capacitor (not shown) on the inverter 201 side and an initial voltage is generated, so that the current is stably supplied to the fluorescent tube thereafter. . However, as described above, this initial voltage is high, which is not preferable for the LED power supply circuit. The high-voltage initial voltage is a voltage necessary for lighting the fluorescent tube, but the high-voltage initial voltage is not necessary for lighting the LED lamp. Therefore, it is necessary to suppress the generation of the initial voltage by preventing the resonance capacitor on the inverter 201 side from functioning. The pseudo-heater circuit 1011 has a function of suppressing the generation of the initial voltage, and the pseudo-heater circuit 1011 realizes repeated power feeding without generating the initial voltage by providing the inverter 201 with a pseudo-impedance. It is. Note that although a mode in which an AC input is supplied from the inverter 201 is described here, a glow or a rapid may be used. When using glow or rapid, the initial voltage is lower than when using an inverter. Therefore, if it is compatible with the inverter, it is possible to supply power to the LED lamp 100 safely and stably even when using glow or rapid. is there.

  The rectifier circuit 1012 converts the AC voltage / current continuously supplied via the pseudo heater circuit 1011 into a DC voltage / current. This is because the LED lamp operates by direct current.

  The smoothing circuit 1013 removes high frequency noise and radiation noise included in the DC voltage / current supplied from the rectifier circuit 1012. Note that the smoothing circuit 1013 is not an essential component.

The control circuit 1014 controls the gate voltage input to the gate circuit 1015.
The gate circuit 1015 supplies voltage / current (direct current) to an LED module on which at least one LED chip is mounted.

<Specific configuration of LED power supply circuit>
FIG. 2 is a diagram illustrating a specific circuit configuration of the LED power supply circuit 101. In the circuit of FIG. 2, reference numerals corresponding to the respective blocks of FIG. 1 are given to circuit portions surrounded by dotted lines. That is, FIG. 2 can be said to be a diagram showing a detailed configuration of each block of FIG.

The pseudo heater circuit 1011 has connection terminals for the four inverters 201, two are inputs from the inverter 201, and the other two are feedback outputs to the inverter 201. The pseudo heater circuit 1011 is configured by only a resistor, for example. Here, for example, if the terminals 3 and 2 are AC inputs from the inverter 201, the terminals 1 and 4 are feedback outputs to the inverter 201. In this case, the resistor R _H 1 has a role in place of the coil in the fluorescent tube. By connecting the R circuit or the CR circuit (C is not a resonance capacitor) to the inverter 201 by such a pseudo heater circuit 1011, the resonance capacitor on the inverter 201 side does not function, that is, the initial voltage is changed. Without being generated, power can be continuously supplied to the circuits after the rectifier circuit 1012 of the LED lamp 100. In FIG. 2, in the pseudo heater circuit, of the four input / output terminals 1 to 4, for example, one of the terminals 1 and 3 is used as an AC input terminal (any one not used as an AC input terminal). One of terminals 2 and 4 is used as an AC input terminal (one of the terminals not used as an AC input terminal serves as a feedback output terminal to the inverter). All four input / output terminals may not be used. There is no problem even if there is only one AC input and one feedback output to the inverter. When there is any feedback information from the connected LED lamp 100, the inverter operates to repeatedly supply power to the LED lamp 100. The pseudo heater circuit 1011 according to the present embodiment suppresses generation of the initial voltage without causing the resonance capacitor of the inverter 201 to function, and feeds back the AC input from the inverter 201 to the inverter 201 as an output. As a result, it is possible to notify the inverter 201 of the presence of a fluorescent tube in a pseudo manner (actually, an LED lamp is connected), and the inverter 201 continues to supply an AC voltage / current.

The rectifier circuit 1012 includes, for example, four diodes, converts alternating current into direct current, and supplies the direct current to the smoothing circuit 1013.
The smoothing circuit 1013 is constituted by, for example, three capacitors connected in parallel. The smoothing circuit 1013 has a function of removing various noises such as high-frequency noise and radiation noise included in the DC output supplied by the rectifier circuit 1012.

  The control circuit 1014 controls the drain current by applying a voltage between the gate and source of the N-channel FET included in the gate circuit 1015.

The gate circuit 1015 supplies an LED driving current to the LED module 102. Specifically, when the gate-source voltage provided by the control circuit 1014 is smaller than the gate threshold voltage, the drain current is small, so that the FET is turned off as a switch. On the other hand, when the gate-source voltage is larger than the gate threshold voltage, the drain current increases, so that the FET is turned on as a switch, and the LED drive current can be supplied to the LED module 102. The degree of brightness of the LED depends on the value of the output side resistance value (R ₁₂ ).

DESCRIPTION OF SYMBOLS 100 ... LED lamp 101 ... LED power supply circuit 102 ... LED module 201 ... Inverter 1011 ... Pseudo heater circuit 1012 ... Rectifier circuit 1013 ... Smoothing circuit 1014 ... Control circuit 1015 ... Gate circuits

Claims (3)

An LED lamp that can be attached to a fluorescent lighting device,
An LED power supply circuit that converts an alternating current input from the fluorescent lamp lighting device into a direct current,
An LED module having at least one LED element, and lighting the LED element by a DC input supplied from the LED power supply circuit;
The LED power circuit includes a pseudo heater circuit that provides impedance, an AC / DC conversion circuit that converts AC input into DC, a control circuit that controls power supply, and a gate circuit that supplies power to the LED module. Including
The pseudo heater circuit is a capacitor included in the fluorescent lamp lighting apparatus, and supplies the AC input as an output to the AC / DC conversion circuit without functioning a resonance capacitor for generating an initial voltage. , And return the AC input as an output to the fluorescent lamp luminaire ,
The pseudo-heater circuit has four input / output terminals in accordance with the terminals of the fluorescent lamp luminaire, two of the four input / output terminals are used as AC input terminals, and the other two are the LED lamp according to claim Rukoto used as an output terminal for feeding back the ac input to the fluorescent lighting fixture. In claim 1,
2. The LED lamp according to claim 1, wherein the pseudo heater circuit is composed only of a resistor. In claim 1,
2. The LED lamp according to claim 1, wherein the pseudo heater circuit is composed of a resistor and a capacitor.

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