JP2020087716A - Luminaire and lighting circuit - Google Patents

Abstract

To provide a luminaire which can be used in combination with a dimmer of reverse phase control system, and loss of safety is restrained even when connected with a dimmer of positive phase control system.SOLUTION: A luminaire 10 receiving supply of AC power subjected to phase control by a dimmer 6 includes a light source 15, and a lighting circuit 20 for supplying a current to a light source 15. The lighting circuit 20 has a rectifier circuit 21 for converting AC power into DC power, a current supply circuit 26 for receiving DC power supplied from the rectifier circuit 21 and supplying a current to the light source 15, a detection circuit 24 for detecting whether the AC power inputted to the lighting circuit 20 is subjected to positive phase control or reverse phase control, and a control circuit 25 for controlling current supply from the current supply circuit 26 to the light source 15, or controlling suppression for an in-rush current from the rectifier circuit 21 to the current supply circuit 26, depending on the detection results from the detection circuit 24.SELECTED DRAWING: Figure 1

Description

The present invention relates to a lighting device and a lighting circuit used for the lighting device, and more particularly to a lighting device and a lighting circuit used in combination with a phase control dimmer.

Conventionally, an illuminating device used in combination with a phase control dimmer has been developed (see, for example, Patent Document 1). In recent years, from the viewpoint of reducing noise and noise, it is expected that the number of dimmers of the anti-phase control type will increase.

Here, the anti-phase control method refers to a phase control method that changes the position (that is, the phase) at which the AC power is turned off for dimming. On the contrary, a phase control method that changes the position (that is, the phase) at which the AC power is turned on for dimming is called a positive phase control method. When simply referred to as a phase control method, it includes a reverse phase control method and a positive phase control method.

JP 2012-230858A

However, when the lighting circuit of the lighting device designed to correspond to the dimmer of the reverse phase control system is connected to the dimmer of the positive phase control system, a large inrush current flows in the lighting circuit, There is a problem in that the resistors forming the lighting circuit generate heat and the safety is impaired.

Therefore, in view of such a problem, the present invention can be used in combination with a dimmer of the reverse phase control system, and is safe even when connected to a dimmer of the positive phase control system. An object of the present invention is to provide a lighting device and a lighting circuit in which the deterioration of the property is suppressed.

In order to achieve the above object, an illuminating device according to an aspect of the present invention is a illuminating device that is supplied with AC power whose phase is controlled by a dimmer, and includes a light source and lighting for supplying an electric current to the light source. A lighting circuit, the lighting circuit includes a rectifier circuit that converts the AC power into DC power, a current supply circuit that receives the DC power supplied from the rectification circuit and supplies a current to the light source, and the AC circuit. A detection circuit that detects whether the electric power is controlled in the positive phase or the reverse phase, and controls the current supply from the current supply circuit to the light source depending on the detection result by the detection circuit, or And a control circuit for controlling suppression of inrush current from the rectifier circuit to the current supply circuit.

In order to achieve the above object, a lighting circuit according to an aspect of the present invention is a lighting circuit that supplies a current to a light source, and a rectifier circuit that converts AC power phase-controlled by a dimmer into DC power. A current supply circuit that receives the direct-current power supplied from the rectifier circuit and supplies a current to the light source; a detection circuit that detects whether the alternating-current power is positive-phase controlled or reverse-phase controlled; A control circuit for controlling the current supply from the current supply circuit to the light source or for suppressing the inrush current from the rectifier circuit to the current supply circuit depending on the detection result of the detection circuit.

INDUSTRIAL APPLICABILITY The present invention can be used in combination with a dimmer of an anti-phase control system, and suppresses the loss of safety even when connected to a dimmer of the positive phase control system. A lighting device and a lighting circuit are provided.

FIG. 1 is a block diagram showing the configuration of the lighting device according to the first embodiment. FIG. 2 is a flowchart showing the operation of the lighting device according to the first embodiment. FIG. 3 is a diagram for explaining a phase control method of the dimmer shown in FIG. FIG. 4 is a block diagram showing the configuration of the lighting device according to the second embodiment. FIG. 5 is a flowchart showing the operation of the lighting device according to the second embodiment. FIG. 6 is a block diagram showing a configuration of the illumination device according to the modified example of the first embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that each of the embodiments described below shows a specific example of the present invention. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, steps, order of steps, and the like shown in the following embodiments are examples, and are not intended to limit the present invention. Further, among the constituent elements in the following embodiments, the constituent elements that are not described in the independent claims showing the highest concept of the present invention will be described as arbitrary constituent elements. In addition, each drawing is not necessarily an exact illustration. In each drawing, the substantially same components are denoted by the same reference numerals, and overlapping description may be omitted or simplified.

(Embodiment 1)
First, the lighting device according to the first embodiment will be described.

FIG. 1 is a block diagram showing the configuration of the illumination device 10 according to the first embodiment. Here, an AC power supply 5 that supplies AC power to the lighting device 10 and a phase control dimmer 6 are also illustrated.

The lighting device 10 is a lighting device that receives the supply of AC power whose phase is controlled by the dimmer 6, and includes, for example, various light sources such as light sources for lighting such as light bulbs and straight tubes, downlights, ceiling lights, pendants, and table stands. Used for lighting equipment. The lighting device 10 includes a light source 15 and a lighting circuit 20.

The light source 15 is an element that emits light when supplied with a current, and is, for example, a solid-state light emitting element such as an LED or an EL (Electronic Liminescent).

The lighting circuit 20 is a circuit that supplies a current to the light source 15, and includes a rectifier circuit 21, a diode 22, a capacitor 23, a detection circuit 24, a control circuit 25, and a current supply circuit 26. In addition, in the present embodiment, the lighting circuit 20 is basically designed to be used in combination with an anti-phase control dimmer. That is, the lighting circuit 20 is not provided with the resistor for suppressing the inrush current, which is necessary when the lighting circuit 20 is used in combination with the dimmer of the positive phase control system.

The rectifier circuit 21 is a circuit that converts AC power supplied from the AC power supply 5 via the dimmer 6 into DC power, and is, for example, a diode bridge.

The diode 22 is a rectifying element that prevents the reverse flow of the direct current output from the rectifying circuit 21.

The capacitor 23 is a smoothing capacitor that allows a high-frequency component contained in the pulsating DC power (that is, voltage and current) output from the rectifier circuit 21 via the diode 22 to pass through. The capacitor 23 not only smoothes the DC power of the pulsating current output from the rectifier circuit 21 via the diode 22, but also high frequency current generated when the dimmer 6 is a positive phase control type dimmer. The components are allowed to pass and flow to the detection circuit 24.

The detection circuit 24 is a circuit that detects whether the AC power input to the lighting circuit 20 is positive-phase controlled or reverse-phase controlled. In the present embodiment, the detection circuit 24 is a resistor inserted in the path (specifically, the ground line) of the current flowing between the rectifier circuit 21 and the current supply circuit 26. The detection circuit 24 detects whether the AC power input to the lighting circuit 20 is positive-phase controlled or reverse-phase controlled by converting the high frequency component of the current that has passed through the capacitor 23 into a voltage with a resistor. To do.

The current supply circuit 26 is a circuit that receives the DC power supplied from the rectifier circuit 21 and supplies a current to the light source 15, and is, for example, a step-up type, step-down type or step-up/down type having switching elements such as an inductor, a diode, and an FET. It is a DC/DC converter of.

The control circuit 25 controls the current supply from the current supply circuit 26 to the light source 15 depending on the detection result of the detection circuit 24, or controls the suppression of the inrush current from the rectifier circuit 21 to the current supply circuit 26. Is an example. In the present embodiment, the control circuit 25 controls the current supply from the current supply circuit 26 to the light source 15 depending on the detection result of the detection circuit 24. That is, the control circuit 25 detects that the detection circuit 24 detects that the AC power input to the lighting circuit 20 is positive-phase controlled (that is, the dimmer 6 is of the positive-phase control type). The control for stopping the current supply from the current supply circuit 26 to the light source 15 is performed.

Specifically, the control circuit 25 stops switching of the switching element included in the current supply circuit 26 when the detection circuit 24 detects that the AC power input to the lighting circuit 20 is under positive phase control. As a result, the current supply from the current supply circuit 26 to the light source 15 is stopped. In the present embodiment, the control circuit 25 is an IC that operates by receiving the supply of the DC voltage output from the rectifier circuit 21. The IC may be composed of a microcomputer including a ROM storing a program, a RAM, a processor executing the program, an input/output circuit such as an A/D converter, or a dedicated logic circuit. Good.

Next, the operation of illumination device 10 according to the present embodiment configured as described above will be described. FIG. 2 is a flowchart showing the operation of lighting device 10 according to the present embodiment. Here, a processing flow by the control circuit 25 of the lighting device 10 is shown.

The control circuit 25 determines whether the detection circuit 24 detects that the AC power input to the lighting circuit 20 is in positive phase control (that is, the dimmer 6 is of a positive phase control system). Yes (S10).

As a result, when the detection circuit 24 detects that the AC power input to the lighting circuit 20 is positive-phase controlled (Yes in S10), the control circuit 25 transfers the current from the current supply circuit 26 to the light source 15. The current supply is stopped (S11). Specifically, the control circuit 25 stops switching of the switching element included in the current supply circuit 26.

On the other hand, when the detection circuit 24 does not detect that the AC power input to the lighting circuit 20 is positive-phase controlled (No in S10), the control circuit 25 supplies the current from the current supply circuit 26 to the light source 15. To continue. Specifically, the control circuit 25 maintains the switching of the switching element included in the current supply circuit 26 without stopping.

Here, the principle of detection by the detection circuit 24 (that is, whether the phase control method of the dimmer 6 is the positive phase control method or the reverse phase control method) will be described.

FIG. 3 is a diagram illustrating a phase control method of the dimmer 6 shown in FIG. FIG. 3A shows an AC voltage (solid line) and an AC current (broken line) input to the lighting device 10 via the dimmer 6 when the phase control system of the dimmer 6 is a positive phase control system. An example of the waveform is shown. FIG. 3B shows an AC voltage (solid line) and an AC current (broken line) input to the lighting device 10 via the dimmer 6 when the phase control system of the dimmer 6 is an anti-phase control system. An example of the waveform is shown.

As can be seen from (a) of FIG. 3, when the phase control method of the dimmer 6 is the positive phase control method, the voltage output from the dimmer 6 rises rapidly, so that in the lighting circuit 20. Inrush current occurs. This rush current is smoothed by the capacitor 23 of the lighting circuit 20, and its high frequency component passes through the capacitor 23 and flows through the detection circuit 24 which is a resistor. The voltage drop (that is, the voltage) generated in the detection circuit 24 is input to the control circuit 25. Thus, the control circuit 25 determines that the phase control method of the dimmer 6 is the positive phase control method by detecting that the voltage input from the detection circuit 24 is higher than the predetermined threshold value.

On the other hand, as can be seen from FIG. 3B, when the phase control method of the dimmer 6 is the anti-phase control method, the voltage output from the dimmer 6 rises gently, so that the lighting circuit No inrush current occurs at 20. Therefore, in the lighting circuit 20, the current flowing through the capacitor 23 and the detection circuit 24, which is a resistor, is small, so that the voltage drop in the detection circuit 24 is a small value. A small voltage drop (that is, voltage) generated in the detection circuit 24 is input to the control circuit 25. The control circuit 25 detects that the voltage input from the detection circuit 24 is not higher than the predetermined threshold value, and thus the phase control method of the dimmer 6 is not the positive phase control method (that is, the dimmer 6 does not have the phase control method). The phase control method is the reverse phase control method).

As described above, the lighting device 10 according to the present embodiment is the lighting device 10 that receives the supply of the alternating-current power whose phase is controlled by the dimmer 6, and includes the light source 15 and the lighting for supplying the current to the light source 15. The lighting circuit 20 includes a circuit 20. The lighting circuit 20 includes a rectifier circuit 21 that converts AC power into DC power, a current supply circuit 26 that receives DC power supplied from the rectifier circuit 21 and supplies current to the light source 15, and lighting. The current from the current supply circuit 26 to the light source 15 depends on the detection circuit 24 that detects whether the AC power input to the circuit 20 is positive-phase controlled or reverse-phase controlled, and the detection result by the detection circuit 24. The control circuit 25 controls the supply or controls the suppression of the inrush current from the rectifier circuit 21 to the current supply circuit 26. In the present embodiment, the control circuit 25 controls to stop the current supply from the current supply circuit 26 to the light source 15 when the detection circuit 24 detects that the AC power is positive-phase controlled.

As a result, the lighting circuit 20 is designed so as to correspond to a dimmer of an anti-phase control system, and if the AC power input to the lighting circuit 20 is positive-phase controlled, the detection circuit 24 detects it. In such a case, the control circuit 25 stops the current supply from the current supply circuit 26 to the light source 15. Therefore, when the lighting device 10 according to the present embodiment is connected to the dimmer of the positive phase control system, a large rush current flows in the lighting circuit, the resistors constituting the lighting circuit generate heat, and the safety is impaired. The occurrence of the problem of being lost is avoided. In other words, lighting that can be used in combination with a dimmer of the reverse phase control system, and that even if it is connected to a dimmer of the positive phase control system, the safety is suppressed from being impaired. The device 10 and the lighting circuit 20 are realized.

Further, the current supply circuit 26 is a DC/DC converter having a switching element, and the control circuit 25 stops switching of the switching element when the detection circuit 24 detects that the AC power is in positive phase control. By doing so, the current supply from the current supply circuit 26 to the light source 15 is stopped.

Thus, when the lighting device 10 is connected to the dimmer of the positive phase control system, the current supply circuit 26 is simply and surely stopped to stop the switching of the switching element included in the current supply circuit 26. Current supply to the light source 15 is stopped.

The detection circuit 24 is a resistor inserted in the path of the current flowing between the rectifier circuit 21 and the current supply circuit 26. Accordingly, by adding a simple circuit in which the lighting circuit 20 is provided with a resistor, it is possible to prevent the safety from being impaired when the lighting device 10 is connected to the dimmer of the positive phase control system.

(Embodiment 2)
Next, the lighting device according to the second embodiment will be described.

FIG. 4 is a block diagram showing the configuration of the illumination device 10a according to the second embodiment. Here, as in FIG. 1, an AC power supply 5 that supplies AC power to the lighting device 10a and a phase control dimmer 6 are also shown.

Unlike the first embodiment, the illumination device 10a according to the present embodiment is designed to be used in combination with any dimmer of the positive phase control system and the negative phase control system. Hereinafter, the points different from the first embodiment will be mainly described.

The lighting device 10a includes a light source 15 and a lighting circuit 20a. The lighting circuit 20a is a circuit that supplies a current to the light source 15, and includes a rectifier circuit 21, a diode 22, a capacitor 23, a detection circuit 24, a control circuit 25a, a current supply circuit 26, a suppression circuit 27, and a bypass switch 28. ..

The suppression circuit 27 is an example of a circuit that suppresses an inrush current generated from the rectifier circuit 21 when the lighting device 10a is connected to the dimmer 6 of the positive phase control system, and in the present embodiment, the rectifier circuit 21. Is a resistor inserted in the path of the current flowing from the current supply circuit 26 to the current supply circuit 26.

The bypass switch 28 is a switch for invalidating the operation of the suppression circuit 27, and when turned on (that is, brought into a conductive state), the current output from the rectifier circuit 21 bypasses the suppression circuit 27 and flows. To enable that.

The control circuit 25a suppresses the AC power input to the lighting circuit 20a when the detection circuit 24 detects that the AC power is in antiphase control (that is, the dimmer 6 is of the antiphase control type). Control is performed to invalidate the operation of the circuit 27. In other words, the control circuit 25 causes the current flowing from the rectifying circuit 21 to the suppressing circuit 27 when the detection circuit 24 detects that the AC power input to the lighting circuit 20a is controlled in anti-phase. It controls so that it flows by bypassing the resistor that constitutes it. Specifically, the control circuit 25a turns on the bypass switch 28 when the detection circuit 24 detects that the alternating-current power input to the lighting circuit 20a is subjected to the reverse phase control, thereby turning on the suppression circuit 27. Disable the action.

Next, the operation of the illumination device 10a according to the present embodiment configured as described above will be described. FIG. 5 is a flowchart showing the operation of the lighting device 10a according to this embodiment. Here, a processing flow by the control circuit 25a of the lighting device 10a is shown.

The control circuit 25a determines whether or not the detection circuit 24 detects that the AC power input to the lighting circuit 20a is subjected to anti-phase control (that is, the dimmer 6 is of the anti-phase control type). Yes (S20).

As a result, when the detection circuit 24 detects that the AC power input to the lighting circuit 20a is subjected to the antiphase control (Yes in S20), the control circuit 25a invalidates the operation of the suppression circuit 27. Control is performed (S21). Specifically, the control circuit 25a invalidates the operation of the suppression circuit 27 by turning on the bypass switch 28.

On the other hand, when the detection circuit 24 does not detect that the alternating-current power input to the lighting circuit 20a is controlled in reverse phase (No in S20), the control circuit 25a does not invalidate the operation of the suppression circuit 27 (that is, , The suppression circuit 27 suppresses the inrush current) (S22). Specifically, the control circuit 25a keeps the operation of the suppression circuit 27 by turning off the bypass switch 28 (that is, turning it off).

As described above, in the lighting device 10a according to the present embodiment, the lighting circuit 20a has the suppression circuit 27 that suppresses the inrush current. The control circuit 25a performs control to invalidate the operation of the suppression circuit 27 when the detection circuit 24 detects that the alternating-current power is reverse-phase controlled, and the detection circuit 24 performs reverse-phase control of the alternating-current power. When it is not detected that there is, the control for controlling the suppression circuit 27 is performed. As a result, the lighting device 10a and the lighting circuit 20a that can operate properly are realized regardless of whether the phase control method of the dimmer 6 is the positive phase control method or the reverse phase control method.

The suppression circuit 27 is a resistor inserted in the path of the current flowing from the rectifier circuit 21 to the current supply circuit 26. Then, the control circuit 25a, when the detection circuit 24 detects that the alternating-current power is controlled in opposite phase, the current flowing from the rectification circuit 21 to the current supply circuit 26 bypasses the resistor of the suppression circuit 27 and flows. To control. As a result, the resistor suppresses the inrush current only in the case where the inrush current is generated.

Although the lighting device and the lighting circuit of the present invention have been described above based on the first and second embodiments, the present invention is not limited to the first and second embodiments. Without departing from the gist of the present invention, various modifications conceived by those skilled in the art may be applied to the first and second embodiments, or another mode constructed by combining some of the components in the first and second embodiments. Are also included within the scope of the invention.

For example, in the first and second embodiments, the detection circuit 24 is realized by the resistor inserted in the ground line connecting the rectifier circuit 21 and the current supply circuit 26. Not limited. FIG. 6 is a block diagram showing a configuration of a lighting device 10b according to a modification of the first embodiment. In the lighting circuit 20b included in the lighting device 10b, the detection circuit 24 (specifically, a resistor) is connected in series with the capacitor 23, and the series connection circuit of the capacitor 23 and the detection circuit 24 is connected to the current supply circuit 26. It is connected in parallel. Then, the control circuit 25b detects the potential of the connection point between the capacitor 23 and the detection circuit 24 to determine whether the dimmer 6 is in the positive phase control system or the reverse phase control system.

Even in the lighting device 10b according to such a modified example, the control circuit 25b can perform the same control as in the first embodiment. The connection position of the detection circuit 24 according to this modification may be applied to the lighting device 10a according to the second embodiment.

Further, although the detection circuit 24 is a resistor in the first and second embodiments, the invention is not limited to this. For example, by monitoring the voltage waveform output from the rectifier circuit 21 and determining whether the rising or falling of the voltage waveform is abrupt, the AC power input to the lighting circuit is positive-phase controlled. It may be the detection circuit 24 that detects whether or not the phase is controlled.

6 Dimmer 10, 10a, 10b Illumination device 15 Light source 20, 20a, 20b Lighting circuit 21 Rectifier circuit 24 Detection circuit 25, 25a, 25b Control circuit 26 Current supply circuit 27 Suppression circuit 28 Bypass switch

Claims (8)

A lighting device which is supplied with AC power whose phase is controlled by a dimmer,
A light source,
A lighting circuit for supplying a current to the light source,
The lighting circuit is
A rectifier circuit that converts the AC power to DC power,
A current supply circuit that receives the DC power supplied from the rectifier circuit and supplies a current to the light source;
A detection circuit for detecting whether the AC power is being controlled in positive phase or in reverse phase,
A control circuit that controls the current supply from the current supply circuit to the light source, or controls the suppression of the inrush current from the rectifier circuit to the current supply circuit, depending on the detection result by the detection circuit. Lighting equipment. The lighting device according to claim 1, wherein the control circuit performs control to stop current supply from the current supply circuit to the light source when the detection circuit detects that the AC power is positive-phase controlled. . The current supply circuit is a DC/DC converter having a switching element,
The control circuit stops the current supply from the current supply circuit to the light source by stopping the switching of the switching element when the detection circuit detects that the alternating-current power is positive-phase controlled. The lighting device according to claim 2. The lighting circuit further includes a suppression circuit that suppresses the inrush current,
The lighting device according to claim 1, wherein the control circuit performs control to invalidate the operation of the suppression circuit when the detection circuit detects that the alternating-current power is subjected to reverse phase control. The suppression circuit is a resistor inserted in a path of a current flowing from the rectifier circuit to the current supply circuit,
The control circuit controls the current flowing from the rectifier circuit to the current supply circuit so as to bypass the resistor when the detection circuit detects that the AC power is reverse-phase controlled. The lighting device according to claim 4. The lighting device according to claim 1, wherein the detection circuit is a resistor inserted in a path of a current flowing between the rectification circuit and the current supply circuit. The lighting circuit further includes a capacitor that smoothes the DC power,
The lighting device according to claim 1, wherein the detection circuit is a resistor connected in series with the capacitor. A lighting circuit that supplies current to the light source,
A rectifier circuit that converts AC power whose phase is controlled by a dimmer into DC power,
A current supply circuit that receives the DC power supplied from the rectifier circuit and supplies a current to the light source;
A detection circuit for detecting whether the AC power is being controlled in positive phase or in reverse phase,
A control circuit that controls the current supply from the current supply circuit to the light source, or controls the suppression of the inrush current from the rectifier circuit to the current supply circuit, depending on the detection result by the detection circuit. Lighting circuit.

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