JP2017199468A - Led lamp, illumination device, and circuit switching method for led lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lamp capable of suppressing an inrush-current that is generated during a switching operation to be performed in accordance with a lighting system, in inexpensive configuration.SOLUTION: An AC voltage is supplied from mouthpieces 1a and 1b as input parts which are connectable to stabilizers of two or more types of different systems and directly attachable even to a commercial power source by implementing construction. The AC voltage is rectified by rectifier circuits 41 and 42 and a rectified voltage is supplied to an LED element of an LED array 39. The type a system of a power supply part is detected by a frequency discrimination circuit 43 as a detection circuit. In an input voltage detection circuit 47, voltage detection of an input voltage and phase detection of the input voltage are performed and results are inputted to a microcomputer 44. If it is judged that switching of a circuit is required in accordance with the system of the power supply part, the microcomputer 44 does not immediately perform a switching operation but performs the switching operation when the input voltage is 0 V or close to 0 V, based on a phase detection signal of the input voltage outputted from the input voltage detection circuit 47.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an LED lamp, a lighting device, and a circuit switching method for the LED lamp.

An LED lamp having an LED (Light Emitting Diode) element as a light source is attached and lit without changing the structure of a ballast to an existing lighting fixture for lighting a fluorescent lamp. Such an LED lamp is called a construction-less type.
Fluorescent lamp lighting methods (lighting circuits) are roughly classified into a glow starter type, a rapid start type, and an inverter type. There is also known an AC (AC) direct connection type LED lamp that can be attached to the above-described two or more lighting methods and can be directly attached to a commercial power supply if construction is performed.

A detection circuit that detects the method of the power supply unit, a switching circuit that switches a circuit that does not need to be operated in the method of the power supply unit detected by the detection circuit to a non-operating state, and a power supply unit that is detected by the detection circuit. An illumination lamp having a discharge circuit for discharging a charge charged in a circuit that does not need to be operated in the system is disclosed (for example, Patent Document 1).
As described above, in a multi-type LED lamp that can support a plurality of lighting methods, it is necessary to switch a circuit that does not need to be operated in a certain lighting method to a state where it does not operate.
As the switching means, switching elements such as SSR (Solid State Relay), MOSFET (metal-oxide-semiconductor field-efect transistor), and relay are used. However, when the switching operation is performed when the input phase is 90 deg (positive vertex), the load and the switching element are stressed by the inrush current generated, which causes a problem.
As a method for avoiding this, a zero cross compatible SSR is commercially available, but it is expensive.

  The present invention has been made in view of such a current situation, and an object of the present invention is to provide an LED lamp capable of suppressing an inrush current generated in a switching operation performed according to a lighting method with an inexpensive configuration.

  In order to achieve the above object, the LED lamp of the present invention can be connected to two or more types of power supply units having different systems, and a detection circuit for detecting the system of the power supply unit and an input from the power supply unit. An input voltage detection circuit for detecting the input voltage to be detected, and switching means for switching the circuit according to the method of the power supply unit detected by the detection circuit, wherein the switching means is the input voltage detection circuit Based on the phase of the input voltage detected by, the switching operation is performed at a timing to suppress the inrush current generated at the time of switching.

  ADVANTAGE OF THE INVENTION According to this invention, the LED lamp which can suppress the inrush current which generate | occur | produces in the case of the switching operation performed according to a lighting system with an inexpensive structure can be provided.

It is a general | schematic block diagram of an example of the illuminating device which concerns on the 1st Embodiment of this invention. It is a circuit diagram of an example of the LED lamp of the 1st Embodiment of this invention. It is a figure which shows an example of the switching structure in the filter circuit of the LED lamp of the 1st Embodiment of this invention. It is a signal diagram which shows an example of the switching operation of the 1st Embodiment of this invention, (a) is a figure in the case of input voltage 100V / 50Hz, (b) is a figure in the case of input voltage 254V / 50Hz. It is a circuit diagram of an example of the LED lamp of the 2nd Embodiment of this invention. It is a circuit diagram of an example of the LED lamp of the 3rd Embodiment of this invention. It is a disassembled perspective view of an example of the illuminating device which concerns on this invention. It is a perspective view of the state where the cover of an example of the straight tube type LED lamp concerning the present invention was removed. It is a perspective view in the state where a part of a case of an example of a straight tube type LED lamp concerning the present invention was cut, and a mouthpiece was removed. It is a figure which shows the structure of an example of the straight tube | pipe type LED lamp which concerns on this invention, (a) is a disassembled perspective view of the notch in one end part, (b) is a disassembled perspective view of the notch in other end part. It is. It is a figure which shows an example of the mounting structure of a LED board, (a) is an exploded perspective view of one end part, (b) is an exploded perspective view of the other end part. FIG. 9 is a view seen from the direction A of FIG. 8 in an example of a straight tube LED lamp according to the present invention.

Embodiments of the present invention will be described below with reference to the drawings.
First, based on FIG. 7 thru | or FIG. 12, the basic structure of the straight tube | pipe type LED lamp as an LED lamp which concerns on embodiment of this invention, and an illuminating device is demonstrated.
FIG. 7 is an exploded perspective view showing the appearance of the lighting device 200. The lighting device 200 includes a straight tube LED lamp 100 and a lighting fixture (lamp) 150 on which the straight tube LED lamp 100 is mounted.
The lighting fixture 150 is the same as a fixture for lighting a fluorescent lamp, and the terminals (4a to 4d) of the straight tube LED lamp 100 are inserted in accordance with the hole positions of the sockets 151a and 151b.
The commercial current flows from the terminals (4a to 4d) to the LED elements described later in the straight tube LED lamp 100, and the straight tube LED lamp 100 is lit.

The straight tube LED lamp 100 is mainly electrically connected to a rod-like (including flat and cylindrical concepts) housing 2, a cover 3 as a translucent and diffusive cover member, and a lighting fixture 150. The caps 1a and 1b are connectable to each other.
Here, the cover 3 is transparent. The diffusibility of the cover 3 may be imparted in shape by adding prism-like irregularities to the cover surface, or may be imparted by including a diffusing material.
When the diffusion material is included, the entire cover 3 may be formed of the diffusion material, or the diffusion material may be added or contained to impart diffusibility.

The casing 2 is formed in a semi-cylindrical shape (cylindrical shape) whose cross-sectional shape is substantially the same in the longitudinal direction (axial direction).
In order to improve the function of radiating heat generated inside, the outer surface of the housing 2 is provided with irregularities (see FIG. 12) to increase the surface area.
The housing | casing 2 is formed with the metal material with large heat conductivity. Due to the cylindrical shape, the casing 2 having a uniform cross-sectional shape can be manufactured at low cost by a processing method such as extrusion molding or pultrusion molding.

As the metal material, an aluminum alloy or a magnesium alloy is often used, but other extruded materials may be used.
The unevenness of the outer peripheral portion can provide a heat dissipation function similar to that provided with ribs or heat dissipation fins.
Here, for the purpose of improving heat dissipation, the outer periphery of the housing 2 is provided with irregularities. However, if the insulation between the housing 2 and a drive board (power supply board) and electrical components described later can be secured, the inner periphery Irregularities may be provided on the surface.

The cover 3 has an outer diameter (curvature) substantially the same as the outer diameter of the housing 2 and is formed in a semicircular shape having an opening along the longitudinal direction of the housing 2.
That is, the cover 3 has an arc-shaped cross-sectional shape and has a size that covers one side surface of the housing 2 in the longitudinal direction.
As shown in FIG. 12, the cover 3 is attached in such a manner that an edge 33 is fitted into an axially extending groove 21 provided on the outer surface of the housing 2, and the integral configuration with the housing 2 is a cylindrical shape. .
As shown in FIG. 7, the caps 1 a and 1 b are provided so as to cover the outer surfaces at both ends in the longitudinal direction of the lamp main body, which is an integral configuration of the housing 2 and the cover 3.
As shown in FIG. 10, the caps 1a and 1b are equipped with terminals 4a to 4d that can be mounted on a lighting fixture (fluorescent lamp lighting fixture) 150 capable of lighting a fluorescent lamp.

Current is supplied to the power supply substrate 7 via the terminals 4a to 4d of the caps 1a and 1b and lead wires 6a and 6b extending from the connector 16 connected to the caps 1a and 1b.
There is no problem even if the terminals 4a to 4d and the lead wires 6a and 6b are electrically connected by a method such as direct soldering.
The bases 1a and 1b are fixed to the housing 2 by a plurality of screws 5a to 5d, so that the housing 2 and the cover 3 fitted thereto are integrated so as to be integrated.

The bases 1a and 1b may be fixed to the housing 2 by means such as caulking instead of screwing. The shapes of the caps 1a and 1b are substantially the same as the caps located at both ends of the existing fluorescent lamp.
Therefore, an LED lamp illumination device can be configured without requiring replacement of the luminaire by attaching the straight tube LED lamp 100 to the existing luminaire using the fluorescent lamp instead of the fluorescent lamp. Can do.
Thereby, compared with the case where a new lighting fixture is separately attached, the facility cost and the construction cost can be greatly reduced, and the labor and time for replacement work can be reduced.

As shown in FIG. 12, an LED substrate as a mounting substrate is disposed outside the flat portion (portion corresponding to a semicircular string) 32 of the housing 2 and inside the cover 3 so as to face the cover 3. 11 is fixed (supported) via a sheet 10 having adhesiveness.
The sheet 10 is preferably made of a material having good thermal conductivity (for example, a heat-dissipating silicone rubber) in order to easily transmit heat generated by the LED to the housing 2, that is, to promote heat dissipation.
The power supply substrate 7 is disposed inside the housing 2 along the inside of the flat portion 32.
As shown in FIG. 8, the LED board 11 is an elongated rectangular printed board, and includes an LED board 11a and an LED board 11b.

Corresponding to the divided configuration of the LED substrate 11, the sheet 10 is also divided in the longitudinal direction.
A plurality of LED elements 12a and 12b are mounted on the LED boards 11a and 11b at predetermined intervals in the longitudinal direction of the housing 2, respectively.
The LED element 12 is a semiconductor light emitting element light source having an EL (Electro Luminescence) effect.

  As shown in FIG. 9, the power supply substrate 7 is formed in an elongated rectangular shape extending in the longitudinal direction of the housing 2, and a plurality of electronic components 9 for direct current power conversion are spaced apart in the longitudinal direction on the mounting surface. It is installed.

The current rectified to direct current by the electronic component 9 is supplied to the mounting boards 11a and 11b through the lead wires 13a and 13b shown in FIG.
The LED boards 11a and 11b are electrically connected by lead wires or jumper wires (not shown).
In the present embodiment, the mounting substrate (LED substrate) on which the semiconductor light emitting element is mounted has a two-series arrangement configuration, but one or three or more series arrangement configurations or a parallel configuration may be used.

A first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic block diagram of the lighting device 200. The lighting device 200 includes a lighting fixture 150 including a ballast 37 as a power supply unit connected to a commercial power source 36, and a straight tube LED lamp 100 as an LED lamp connected to the ballast 37. Yes. The ballast 37 is disposed in a state in which the ballast 37 cannot be seen from the outside.
The straight tube LED lamp 100 includes an LED drive circuit 38 and an LED array 39 composed of 12 LED element groups.
In the case of the AC direct connection system, the ballast 37 does not exist.

Details of the circuit configuration will be described with reference to FIG.
An AC voltage is supplied from the caps 1a and 1b serving as input units that can be connected to two or more different types of ballasts 37. The alternating voltage is rectified (directed) by the rectifier circuits 41 and 42 through the filter circuit 40, and the rectified voltage is supplied to the LED elements 12 of the LED array 39.

The type of the ballast 37 is detected by a frequency discrimination circuit 43 as a detection circuit. Even when variations including the accuracy of the power supply frequency are taken into consideration, the frequency (50/60 ± 1 Hz) when the ballast system is the glow starter type or the rapid start type and the frequency (in the case of the inverter type distributed in the market ( 20 to 100 kHz) can be clearly distinguished by the frequency discrimination circuit 43.
For this reason, according to the distinction result of the frequency discrimination circuit 43, it is possible to switch between the case of passing through the switching circuit and the case of not passing (through the LED directly).
The portion excluding the LED array 39 in FIG. 2 corresponds to the LED drive circuit 38 in a broad sense of FIG.

As a circuit configuration of the frequency discriminating circuit 43, a predetermined cut-off frequency is set, an HPF (High Pass Filter) configuration or an LPF (Low Pass Filter) configuration is set, and its output is input to a microcomputer 44 as a switching means. To do. The microcomputer 44 selects a control mode or performs a switching operation according to the input.
The microcomputer 44 receives a current value flowing from the LED current detection circuit 45 to the LED element.
If the input current from the outside is not a high frequency as a result of the discrimination by the frequency discrimination circuit 43, the microcomputer 44 controls the switching circuit 46 to perform a switching operation at a high frequency so that a constant current flows through the LED element. To do.
Examples of the switching circuit include a step-up chopper (Boost), a step-down chopper (Buck), and a step-up / step-down chopper (Buck-Boost).

The input voltage detection circuit 47 has a configuration in which a voltage dividing circuit composed of an impedance element (resistance) is inserted into an external input voltage rectified by the rectifier circuits 41 and 42 and a GND (ground) line.
The input voltage detection circuit 47 detects the voltage of the input voltage and the phase of the input voltage, and inputs the result to the microcomputer 44. Specifically, it is input to an ADC (Apple Display Connector) terminal of the microcomputer 44.
Since the circuit configuration of the input voltage detection circuit 47 can be configured with several impedance elements and relays (or semiconductor switches), it can be configured at low cost.

In the filter circuit 40 to be switched by the microcomputer 44, an EMI (electromagnetic interference) filter is required when the lighting method is the AC direct connection method.
As shown in FIG. 3, the filter circuit 40 includes an LPF coil 48, a common mode choke coil 49, and X capacitors 50 disposed on both sides of the common mode choke coil 49. The microcomputer 44 determines whether or not the X capacitor 50 is inserted between the lines according to the lighting method.
When the X capacitor 50 is inserted between the lines, the switches 51 and 52 are turned on by the microcomputer 44.

  According to the method of the power supply unit detected by the frequency discriminating circuit 43, the switching operation by the microcomputer 44 requires switching between a circuit that does not need to be operated in the method to a non-operating state and an operation in the method. It includes both concepts of switching a circuit to an operating state.

Based on FIG. 4, the switching operation of the microcomputer 44 in the present embodiment will be described. This is an example of connection to a glow starter type ballast.
The uppermost channel C1 on the vertical axis indicates a switching signal (1 div / 10 V) from the microcomputer 44. The center channel C2 shows the LED current. The lowermost channel C3 indicates the phase detection signal output (1 div / 0.35 V) of the input voltage output from the input voltage detection circuit 47.
FIG. 4A is an example of an input of 100 V / 50 Hz, and FIG. 4B is an example of an input of 254 V / 50 Hz.

When the microcomputer 44 determines that the circuit needs to be switched according to the method of the power supply unit, the microcomputer 44 does not immediately perform the switching operation. That is, the phase detection signal of the input voltage output from the input voltage detection circuit 47 is monitored, and the timing for suppressing the inrush current generated at the time of switching is obtained.
Specifically, the microcomputer 44 performs a switching operation when the phase of the input voltage is 0V or close to 0V. Here, “when close to 0 V” means a phase range other than 0 V that can suppress the inrush current.

If the switching operation is performed when the phase of the input voltage is 0 V or close to 0 V, the inrush current can be reduced. For this reason, it is not necessary to provide a current limiting element for preventing inrush current.
The timing for performing the switching operation is not limited to the example shown in FIG. In other words, any timing that suppresses the inrush current generated at the time of switching may be used.

FIG. 5 shows a circuit configuration of the LED lamp according to the second embodiment.
The same parts as those of the above-described embodiment are denoted by the same reference numerals, and the description on the configuration and the function already described is omitted as appropriate (the same applies to the other embodiments).
In the present embodiment, the filter circuit 40 is not provided, and the control method selection circuit 53 is provided.

In the control method selection circuit 53 to be switched by the microcomputer 44, a line through which an input from the outside passes is selected by an output signal of the microcomputer 44. Since the output from the microcomputer 44 is a small signal and the external input is a high voltage, it can be driven by insulation.
In the control system selection circuit 53, it is determined whether or not to pass the switching circuit 46 according to the system of the power supply unit, and switching is performed according to the determination.

As an embodiment of the control method selection circuit 53, it can be configured by a mechanical switch such as a relay, or a semiconductor switch circuit using a MOSFET, a triac or the like.
Also in this embodiment, the timing at which the microcomputer 44 performs the switching operation is a timing at which the inrush current generated at the time of switching is suppressed.
Specifically, the microcomputer 44 performs a switching operation when the phase of the input voltage is 0V or close to 0V. Thereby, inrush current can be reduced.

FIG. 6 is a diagram showing a circuit configuration of the LED lamp according to the third embodiment, and is a circuit configuration diagram combining the configuration of FIG. 2 and the configuration of FIG. 5.
In the present embodiment, the filter circuit 40 and the control method selection circuit 53 are to be switched by the microcomputer 44.
Also in this embodiment, the timing at which the microcomputer 44 performs the switching operation is a timing at which the inrush current generated at the time of switching is suppressed.
Specifically, the microcomputer 44 performs a switching operation when the phase of the input voltage is 0V or close to 0V. Thereby, inrush current can be reduced.

The preferred embodiments of the present invention have been described above. However, the present invention is not limited to such specific embodiments, and unless specifically limited by the above description, the present invention described in the claims is not limited. Various modifications and changes are possible within the scope of the gist.
The effects described in the embodiments of the present invention are merely examples of the most preferable effects resulting from the present invention, and the effects of the present invention are limited to those described in the embodiments of the present invention. is not.

36 power supply unit 43 detection circuit 44 switching means 47 input voltage detection circuit 100 LED lamp 150 lighting fixture 200 lighting device

JP-A-2015-179654

Claims (6)

It can be connected to two or more types of power supply units with different methods,
A detection circuit for detecting a method of the power supply unit;
An input voltage detection circuit for detecting an input voltage input from the power supply unit;
Switching means for switching the circuit according to the method of the power supply unit detected by the detection circuit;
Have
The switching means is an LED lamp that performs a switching operation at a timing that suppresses an inrush current generated at the time of switching based on the phase of the input voltage detected by the input voltage detection circuit. The LED lamp according to claim 1, wherein
The switching means is an LED lamp that performs a switching operation when the phase of the input voltage is 0V or close to 0V. The LED lamp according to claim 1 or 2,
An LED lamp in which the detection circuit is a frequency discrimination circuit.   The illuminating device provided with the LED lamp as described in any one of Claims 1-3, and a lighting fixture. A circuit switching method for LED lamps that can be connected to two or more types of power supply units with different methods,
When switching the circuit according to the detected method of the power supply unit, an LED lamp that performs switching at a timing that suppresses the inrush current generated at the time of switching based on the phase of the input voltage input from the power supply unit. Circuit switching method. In the LED lamp circuit switching method according to claim 5,
A circuit switching method for an LED lamp that switches when the phase of the input voltage is 0V or close to 0V.

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