JP2017199644A - Led lamp, lighting device and lighting method of led lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lamp that can be lighted stably, by grasping the fact that the output voltage of an electronic ballast became unstable quickly, regardless of the difference in the specification of the electronic ballast.SOLUTION: An LED lamp 100 includes an LED array 39 where multiple LED elements are arranged, and is connectable with an inverter ballast as an electronic ballast for fluorescent lamp. A microcomputer 41 monitors pulsation of LED current flowing through the LED array 39, by an ADC terminal 43 as output state detection means. If the fact that the output voltage of the inverter ballast 37 became unstable was detected, when the output current therefrom was controlled to an aimed current value by varying the impedance, lighting is controlled to be carried out in a region where the output voltage of the inverter ballast 37 becomes stable. More specifically, when the output voltage of the inverter ballast 37 became unstable, lighting is carried out after returning back to the impedance value before the output voltage becomes unstable.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an LED lamp, an illumination device, and an LED lamp lighting method.

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.
In the construction-less type, the specifications of the connected electronic ballast (hereinafter also referred to as “inverter ballast”) are not constant and have various characteristics.
There is known a technique for lighting by determining lighting conditions for lighting under optimum conditions while improving energy saving for inverter ballasts of various specifications.
Specifically, impedance control is performed to vary the impedance seen from the inverter ballast in the LED lamp when connected to the inverter ballast, and the inverter ballast output current is controlled to light up under the target lighting conditions. is there.

  For the purpose of improving energy saving at the time of connection to an inverter ballast, a method of controlling impedance using a variable inductor has been proposed (for example, Patent Document 1).

  However, in the conventional impedance control method, in order to improve the energy saving performance of the inverter ballast, when the output current of the inverter ballast is controlled to the target current value by changing the impedance, the output voltage of the inverter ballast is There has been a problem of becoming unstable and appearing as LED flickering or lighting failure.

  The present invention was devised in view of such a situation, and quickly grasps that the output voltage of the electronic ballast has become unstable regardless of the difference in the specifications of the electronic ballast, and stably lights up. An object of the present invention is to provide an LED lamp that can be used.

  In order to achieve the above object, the present invention provides an LED lamp that includes an LED element and can be connected to an electronic ballast for a fluorescent lamp, and detects that the output voltage of the electronic ballast has become unstable. Output state detecting means.

  ADVANTAGE OF THE INVENTION According to this invention, regardless of the difference in the specification of an electronic ballast, the LED lamp which can grasp | ascertain rapidly that the flicker has arisen because the output voltage of the electronic ballast became unstable can be provided.

It is a general | schematic block diagram of an example of the illuminating device which concerns on one Embodiment of this invention. It is an example of the circuit diagram of the illumination device. It is a conceptual diagram of an example of the control which lights in the area | region where the output voltage of an electronic ballast becomes stable when the output voltage of an electronic ballast becomes unstable. It is a graph which shows an example of the relationship between the VI characteristic of a ballast, and the VI characteristic of a lamp | ramp. 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. 7 is a view seen from the direction A of FIG. 6 in an example of a straight tube LED lamp according to the present invention. It is a figure which shows typically an example of the electric current value at the time of the calibration operation | movement of the LED lamp which concerns on this invention. It is a figure which shows an example of the control method in the calibration which concerns on this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
First, based on FIG. 5 thru | or FIG. 10, the basic structure of the straight tube | pipe type LED lamp as an LED lamp which concerns on this embodiment, and an illuminating device is demonstrated.
FIG. 5 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. 10) 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. 10, the cover 3 is attached in such a manner that an end 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. 5, the caps 1 a, 1 b are provided so as to cover the outer surfaces at both ends in the longitudinal direction of the lamp body, which is an integral configuration of the housing 2 and the cover 3.
As shown in FIG. 8, the caps 1a and 1b are equipped with terminals 4a to 4d that can be mounted on a lighting fixture (fluorescent lighting fixture) 150 that can turn on 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. 10, an LED substrate as a mounting substrate that faces the cover 3 outside the flat portion (portion corresponding to a semicircular string) 32 of the housing 2 and inward of 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. 6, 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. 7, 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.

An embodiment of the present invention will be described with reference to FIGS.
First, based on FIG. 4, the principle of fluctuation and flickering of the output voltage of the inverter ballast (electronic ballast) will be described.
FIG. 4 is a diagram showing VI characteristics of an inverter ballast for a fluorescent lamp. In the inverter ballast, the output current is determined by the output voltage according to the VI characteristic.
For this reason, energy saving can be improved by using in the area | region of the output voltage (impedance) lower than a fluorescent lamp, ie, the area | region of the right side rather than the stable operating point of FIG. However, when used at an impedance lower than the stable operating point, the PFC (power factor correction) operation in the ballast becomes unstable, and there is an inverter ballast in which the output voltage varies greatly.

  In the impedance control at the time of connection to the inverter ballast, the impedance is varied to reduce the effective power in order to improve the energy saving property of the inverter ballast for the fluorescent lamp. When the active power is reduced, the ON width of the switching element of the PFC circuit in the inverter stabilizer becomes minimum, and the PFC operation becomes unstable. When the PFC operation becomes unstable, the output voltage of the inverter ballast fluctuates, and the input fluctuation occurs with respect to the LED element. Appearing as LED flicker due to this input fluctuation.

When the PFC operation in the inverter ballast becomes unstable, the output voltage fluctuation of the inverter ballast is greatly increased.
In the present invention, the amplitude of the secondary voltage of the inverter ballast is detected as a pulsating current flowing in the LED element 12. When the amplitude difference of the pulsating flow between the next control and the previous control in the impedance control exceeds a predetermined value, it is determined that the output voltage of the inverter stabilizer has become unstable. In that case, flicker is suppressed by performing control to return to the control value (impedance value) before becoming unstable. The configuration will be described below.

FIG. 1 is a schematic block diagram of the lighting device 200. The lighting device 200 is disposed in a state invisible to the lighting fixture 150, and includes an inverter ballast 37 connected to the commercial power source 36 and a straight tube LED lamp 100 connected to the inverter ballast 37. Yes.
The straight tube LED lamp 100 includes an LED drive power source (LED drive circuit) 38 and an LED array 39 composed of 12 LED elements.

The configuration of the impedance control circuit in this embodiment is shown in FIG.
The diode bridge 40 as a rectifier circuit performs full-wave rectification on the AC (alternating current) power from the inverter stabilizer 37 and converts the diode bridge to DC (direct current).
The input smoothing capacitor C1 smoothes full-wave rectified power, and ON / OFF of the insertion is controlled by the control transistor Q1.
The switching smoothing capacitor C2 smoothes the switched electric power, and ON / OFF of the insertion is controlled by the control transistor Q2.
Reference numeral L1 denotes a switching inductor, and D1 denotes a switching diode.

Reference sign Q3 indicates a bypass control transistor of the switching inductor L1. The bypass control transistor Q3 is connected in parallel to both ends of the switching inductor L1, and is turned on when bypassing to short-circuit the switching inductor L1, and is turned off when bypass is OFF to enable the switching inductor L1.
Reference sign Q4 indicates a switching element. The LED current flowing through the LED element 12 is PWM (Pulse Width Modulation) controlled by the switching of the switching element Q4.

Reference symbol R1 indicates an LED current detection resistor. The current value × resistance value voltage is read by the A / D converter of the microcomputer 41 as the control means to calculate the current value. The microcomputer 41 controls the entire circuit.
The microcomputer 41 includes an EEPROM (Electrically Erasable Programmable ROM) 42 as a non-volatile memory that holds lighting conditions to be described later, and an ADC (Analog to Analog) as an output state detection unit that detects a pulsating flow of the LED current flowing through the LED element 12 Digital Converter) terminal 43 is provided.

The general operation principle is as follows.
(1) At the time of lighting, the control transistors Q1 and Q2 are OFF, and the switching inductor L1 is bypassed by the bypass control transistor Q3. This is because if there is a load of C (capacitor) or L (inductor) at the time of lighting, it may not light up.
(2) After the lighting, the control transistors Q1 and Q2 are turned on, and the bypass control transistor Q3 bypassing the switching inductor L1 is turned off.
(3) The ON timing of the control transistors Q1 and Q2 and the OFF timing of the bypass control transistor Q3 are the bypass control transistors after a lapse of a certain time (eg, 2 seconds) after the control transistors Q1 and Q2 are turned ON. Turn off Q3.

  (4) By PWM control, control is performed so as to achieve a predetermined target LED current. The PWM control increases the ON duty of the switching element Q4 from 0% until the target LED current is reached. The PWM control starts from on duty 0% and increases the duty. For example, increase the duty by 5% every second. As the on-duty increases, the LED current decreases. The duty when the LED current decreases to the target LED current value is set as the lighting condition.

In the present invention, when the output of the inverter ballast 37 becomes unstable during the control of (4) above, it is detected at the ADC terminal 43, and the output of the inverter ballast 37 is turned on at a stable duty. Objective.
Depending on the type of inverter ballast, the output voltage of the ballast greatly fluctuates when it is raised to a certain on-duty, and the LED flickers due to this fluctuation. LED flickering appears as a pulsating flow of LED current.
The LED current pulsation is monitored at the ADC terminal 43 in the control circuit. When the set threshold value (predetermined value) is exceeded, it is determined that the output of the inverter stabilizer 37 has become unstable, and the output instability of the inverter stabilizer 37 is resolved by returning to the duty before it becomes unstable. It becomes possible.

FIG. 3 is a diagram showing the concept of pulsating flow detection. The pulsating flow of the LED current in the impedance control is monitored at the ADC terminal 43. For example, the amplitude of the pulsating current is m1 for the LED current of Duty 55%, and if the Duty is decreased by 1 STEP, the amplitude of the pulsating current is m2 for the LED current of Duty 50%.
The microcomputer 41 compares the amplitude m1 of the pulsating flow when the duty is 55% with the amplitude m2 of the pulsating flow when the duty is 50%,
If (m2-m1)> the threshold value, it is determined that the output voltage of the inverter stabilizer 37 has become unstable.

  When it is determined that the output voltage of the inverter stabilizer 37 has become unstable, control is performed to turn on the light in a region where the output voltage of the inverter stabilizer 37 is stable. That is, as indicated by the broken line arrow, control is performed to return the duty to the impedance value (duty 55%) at which the output voltage of the inverter stabilizer 37 was stable.

As described above, in the present invention, the microcomputer 41 is provided on the LED control circuit, and the output fluctuation of the inverter stabilizer at a certain impedance value is detected at the ADC terminal 43 of the microcomputer 41 as the pulsating current of the LED current. For this reason, it becomes possible to return to the impedance value at which the output voltage of the inverter ballast is stabilized at the time of detection.
According to the present invention, it is possible to quickly grasp that flickering is caused by the output voltage of the electronic ballast becoming unstable, and it is possible to take measures to suppress flickering automatically or manually. .

In the above embodiment, the output state of the inverter stabilizer 37 is determined by detecting the pulsating current of the LED current. However, when the output voltage of the inverter stabilizer 37 becomes unstable, It is conceivable to output various different waveforms depending on the design.
Specifically, for example, as shown in FIG. 11 (a), the output current may be extremely reduced, or the output may be momentarily interrupted as shown in FIG. 11 (b). .
Therefore, in this embodiment, such an output state instability is detected using the microcomputer 41.

  Note that the impedance control circuit already shown in FIG. 2 will be described as the control circuit 50 when it is particularly necessary in the following description.

First, as shown in FIG. 11A, the operation of the control circuit 50 when the current from the inverter stabilizer 37 is extremely reduced during calibration will be described.
Incidentally, "extremely", for example LED current and current decreases, it shows a case where a current value lower than 20mA than a predetermined operating current value indicated by the current value I ₁ in the figure by the dashed line. However, the present invention is not limited to such a configuration, and the numerical value of 20 mA may take various values depending on design values.

As described above, the ADC terminal 43 monitors the output voltage or the output current using the LED current detection resistor R1.
The microcomputer 41 raises the on-duty of the switching element Q4 from 0% in increments of 5% every second by PWM control. Here, increasing the on-duty of Q4 (= lowering off-duty) means that the impedance of the control circuit 50 decreases. Thus, by the impedance control of the control circuit 50, the output current of the inverter stabilizer 37 is reduced, so that the LED current is reduced. Note that the amount of change in ON duty of the switching element Q4 and the time for each STEP of the change may be arbitrarily set. For example, the duty may be increased by 3.125% every 100 ms.

In the situation shown in FIG. 11A, for example, when the impedance control is performed, the inverter ballast 37 side judges that “the predetermined output current does not come out”, and the protection circuit works to extremely suppress the LED current. This is the case.
ADC terminal 43, when a predetermined or designed current value extremely current than I ₁ detects that becomes lower, stores the Duty serving first DutyD1 time points measured according current value to the microcomputer 41 To do. The ADC terminal 43 interrupts the calibration operation once, and increases the on-duty of the switching element Q4 again in steps of 5% from Duty 0%.
Note that the reason why the duty ratio is once returned to ON duty 0% is to reset the protection operation of the protection circuit on the inverter ballast 37 side, and depends on the design on the inverter ballast 37 side.

In the present embodiment, when there is a stored first duty D1, the microcomputer 41 controls to turn on at a duty that is larger than the first duty and at which the output voltage of the inverter stabilizer 37 is stable. Do.
With this configuration, even when the protection circuit on the inverter ballast 37 side operates, an optimum output current value is ensured by adjusting the duty of the switching element Q4. That is, with this configuration, it is possible to quickly grasp and suppress output voltage instability due to the protection operation of the electronic ballast.

As described above, in the present embodiment, the ADC terminal 43 serving as the output state detection means detects the output fluctuation of the inverter stabilizer 37 from the duty ratio of the current flowing through the LED element 21.
With this configuration, it is possible to quickly grasp and suppress the output voltage instability due to the protection operation of the electronic ballast.

Next, as shown in FIG. 11B, the output voltage becomes zero when the protection circuit of the inverter ballast 37 is operated at a value equal to or less than a predetermined duty D1, in other words, the inverter ballast 37 stops the output. The case where it does is demonstrated.
When the inverter ballast 37 stops outputting in this way, no current flows through the microcomputer 41, so the ADC terminal 43 cannot detect the current and calibration cannot be performed.

Therefore, in the present embodiment, the control circuit 50 has an EEPROM 42 as stop detection means for detecting that the inverter stabilizer 37 has stopped outputting.
The control circuit 50 quickly grasps and suppresses the occurrence of flicker even when the inverter ballast 37 stops the output by the protection circuit according to the control flow of the lighting method as shown in FIG. To control.

First, when the LED lamp 100 is turned on, the microcomputer 41 raises the ON duty of the switching element Q4 from 0% in increments of 5% every second by PWM control (step S101).
The microcomputer 41 uses the ADC terminal 43 to monitor whether the inverter ballast 37 has stopped outputting (step S102).
When the inverter ballast 37 side protection circuit operates and the inverter ballast 37 stops outputting, the microcomputer 41 uses the EEPROM 42 which is a non-volatile memory to turn off the first condition that the inverter ballast 37 is stopped. DutyD1 which is the duty of the current is stored (step S104).
Here, when the LED current reaches an optimum value or a predetermined current value without stopping the output of the inverter stabilizer 37, the calibration operation is terminated and the LED lamp 100 is turned on with the current value ( Step S103).
In step S104, when DutyD1 is stored, the ADC terminal 43 interrupts the calibration operation, and increases the on-duty of the switching element Q4 in steps of 5% again from Duty 0% (Step S105).

When the protection circuit on the inverter ballast 37 side operates again and the inverter ballast 37 stops outputting, the microcomputer 41 uses the EEPROM 42 to stop the light-off condition, that is, the inverter ballast 37 stops, as in step S104. The duty D2 that is the second duty is stored (step S106).
Here, when the LED current reaches an optimum value or a predetermined current value without stopping the output of the inverter stabilizer 37, the calibration operation is terminated and the LED lamp 100 is turned on with the current value ( Step S103).

In the present embodiment, on condition that the inverter ballast 37 stops outputting during calibration, the EEPROM 42 stores the duty of the switching element Q4 when the output stops as the second duty D2 (step S107).
This point will be described in more detail.
The state where the inverter ballast 37 stops outputting during calibration includes various cases such as when the user turns off the switch immediately after lighting, in addition to the case where the protection circuit of the inverter ballast 37 operates. The state is considered.
However, especially when the protection circuit of the inverter ballast 37 operates, the protection circuit should operate at a certain LED current.

Therefore, in the present embodiment, the first duty D1 and the second duty D2 are stored using the EEPROM 42 on condition that the output of the inverter ballast 37 is stopped during the calibration.
Further, the microcomputer 41 compares the first duty D1 and the second duty D2, and if there is no difference between the two values that can be regarded as approximate or the same value, the protection circuit of the inverter ballast 37 operates. It is determined that this is because (step S108).
Specifically, when the difference between the first duty D1 and the second duty D2 is within ± 5%, the microcomputer 41 stops the output of the inverter stabilizer 37 due to the operation of the protection circuit. Judge. In addition, it is not limited to this structure, If it is the difference of the grade which can be considered to be approximate or the same value, it will not be limited to 5%.

In step S108, if the first duty D1 and the second duty D2 are far apart, it is determined that one of the output stops is caused by, for example, a user operation, and the inverter is stabilized again. Monitoring continues until the instrument 37 stops outputting.
If it is determined in step S108 that D1 = D2 or D1≈D2, the duty D1 is compared with the duty D2, and the duty of the switching element Q4 is set to the third duty D3 smaller than the smaller one (see FIG. Step S109).

As described above, the control circuit 50 has a function as a control unit that performs control so that the output voltage of the inverter stabilizer 37 is lit at a stable duty.
With this configuration, it is possible to quickly grasp and suppress the output voltage instability due to the protection operation of the electronic ballast.

In the present embodiment, the microcomputer 41 has an EEPROM 42 that detects that the output of the inverter ballast 37 has stopped.
With such a configuration, even when the inverter ballast 37 stops outputting, it is possible to quickly grasp and suppress the output voltage instability due to the protective operation of the electronic ballast.

In the present embodiment, the control circuit 50 stores the first Duty D1 in which the output of the inverter ballast 37 is stopped, and the second Duty D2 in which the output of the inverter ballast 37 is stopped after the first Duty D1. ing.
Also, on condition that the difference between the first duty D1 and the second duty D2 is within a predetermined value, the duty set by the control circuit 50 is the smaller of the first duty and the second duty Set to a smaller value.
With such a configuration, even when the inverter ballast 37 stops outputting, it is possible to quickly grasp and suppress the output voltage instability due to the protective operation of the electronic ballast.

In the present embodiment, when connected to the inverter ballast 37, the LED lamp 100 performs impedance control in which the impedance is varied to control the output current of the inverter ballast 37 to a target current value. Is turned on at a duty that stabilizes the output voltage of the inverter stabilizer 37 on the condition that the output of the inverter stabilizer 37 is detected.
With such a configuration, even when the inverter ballast 37 stops outputting, it is possible to quickly grasp and suppress the output voltage instability due to the protective operation of the electronic ballast.

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.

12 LED elements 37 Electronic ballast (inverter ballast)
41 Control means (microcomputer)
42 Stop detection means (EEPROM)
43 Output state detection means (ADC terminal)
DESCRIPTION OF SYMBOLS 100 LED lamp 150 Lighting fixture 200 Lighting apparatus D1 1st Duty
D2 Second Duty

Japanese Patent No. 5266594

Claims (12)

An LED lamp comprising an LED element and connectable to an electronic ballast for a fluorescent lamp,
An LED lamp having output state detecting means for detecting that the output voltage of the electronic ballast has become unstable. The LED lamp according to claim 1, wherein
The LED lamp which has a control means which controls to light in the area | region where the output voltage of the said electronic ballast is stabilized, when it is detected by the said output state detection means that the output voltage of the said electronic ballast became unstable. The LED lamp according to claim 2,
The LED lamp in which the output state detection means detects an output fluctuation of the electronic ballast as a pulsating current flowing in the LED element. The LED lamp according to claim 3,
The control means performs impedance control in which the impedance is varied to control the output current of the electronic ballast to a target current value, and the amplitude difference of the pulsating flow detected by the output state detection means exceeds a predetermined value. When the control means determines that the output voltage of the electronic ballast has become unstable, the LED lamp returns the impedance to a value before the output voltage of the electronic ballast becomes unstable. The LED lamp according to claim 2 to 4,
The LED lamp, wherein the output state detection means detects an output fluctuation of the electronic ballast from a duty ratio of a current flowing through the LED element. The LED lamp according to claim 5,
The control means performs impedance control for controlling the current to a target current value,
The LED lamp, wherein the output voltage of the electronic ballast is determined to be unstable on the condition that the current detected by the output state detection means is 20 mA or more lower than the target current value. The LED lamp according to any one of claims 1 to 6,
The LED lamp according to claim 1, wherein the output state detection means includes a stop detection means for detecting that the output of the electronic ballast is stopped. The LED lamp according to claim 7,
On condition that the output of the electronic ballast is stopped by the stop detection means,
The LED lamp which has a control means which controls to light by Duty which the output voltage of the said electronic ballast is stabilized. The LED lamp according to claim 8,
The control means stores a first duty when the output of the electronic ballast is stopped and a second duty when the output of the electronic ballast is stopped after the first duty;
On the condition that the difference between the first duty and the second duty is within a predetermined value, the duty set by the control means is the smaller of the first duty and the second duty An LED lamp characterized by being set to a smaller value.   The illuminating device provided with the LED lamp as described in any one of Claims 1-9, and a lighting fixture. An LED lamp lighting method comprising an LED element and connectable to an electronic ballast for a fluorescent lamp,
When connecting to the electronic ballast, impedance control is performed to vary the impedance and control the output current of the electronic ballast to a target current value, and the output voltage of the electronic ballast becomes unstable. Detecting by monitoring the pulsating current flowing through the LED element and detecting that the output voltage of the electronic ballast becomes unstable, the impedance becomes unstable when the output voltage of the electronic ballast is unstable. LED lamp lighting method to return to the previous value and turn on. An LED lamp lighting method comprising an LED element and connectable to an electronic ballast for a fluorescent lamp,
When connecting to the electronic ballast, impedance control is performed to control the output current of the electronic ballast to a target current value by changing impedance, and detecting that the output of the electronic ballast is stopped, the electronic ballast A method for lighting an LED lamp that is lit at a duty at which the output voltage of the electronic ballast is stabilized on the condition that the output of the ballast is stopped.

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