JP7373756B2 - Lighting equipment and lighting circuits - Google Patents

Description

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

Conventionally, lighting devices that are used in combination with phase control type dimmers have been developed (for example, see Patent Document 1). In recent years, it is expected that the number of anti-phase control type dimmers will increase from the viewpoint of reducing noise.

Here, the anti-phase control method refers to a phase control method that changes the position (that is, phase) at which AC power is turned off for dimming. Conversely, a phase control method that changes the position (that is, phase) at which 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 an antiphase control method and a positive phase control method.

JP2012-230858A

However, when the lighting circuit of a lighting device designed to be compatible with a dimmer using a reverse phase control method is connected to a dimmer using a positive phase control method, a large inrush current flows through the lighting circuit. There is a problem in that the resistor that makes up the lighting circuit generates heat, impairing safety.

Therefore, in view of these problems, the present invention has been proposed to be able to be used in combination with a dimmer of a reverse phase control method, and to be safe even when connected to a dimmer of a positive phase control method. An object of the present invention is to provide a lighting device and a lighting circuit in which loss of quality is suppressed.

In order to achieve the above object, a lighting device according to one embodiment of the present invention is a lighting device that receives AC power whose phase is controlled by a dimmer, and includes a light source and a lighting device that supplies current to the light source. 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 rectifier circuit and supplies current to the light source, and the AC power circuit. A detection circuit for detecting whether power is controlled in positive phase or reverse phase, and a resistor inserted in a path of current flowing from the rectifier circuit to the current supply circuit, and using the resistor. , a control circuit that controls suppression of rush current from the rectifier circuit to the current supply circuit depending on a detection result by the detection circuit.

In order to achieve the above object, a lighting circuit according to one embodiment of the present invention is a lighting circuit that supplies current to a light source, and includes 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 current to the light source; a detection circuit that detects whether the AC power is controlled in positive phase or in reverse phase; A resistor is inserted in the path of the current flowing from the rectifier circuit to the current supply circuit, and using the resistor, the current flow from the rectifier circuit to the current supply circuit is controlled depending on the detection result by the detection circuit. and a control circuit that controls suppression of inrush current.

According to the present invention, it can be used in combination with a dimmer using a reverse phase control method, and even when connected to a dimmer using a positive phase control method, safety is prevented from being compromised. A lighting device and a lighting circuit are provided.

FIG. 1 is a block diagram showing the configuration of a lighting device according to Embodiment 1. FIG. 2 is a flowchart showing the operation of the lighting device according to the first embodiment. FIG. 3 is a diagram illustrating a phase control method of the dimmer shown in FIG. 1. FIG. 4 is a block diagram showing the configuration of a 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 the configuration of a lighting device according to a modification of the first embodiment.

Hereinafter, embodiments of the present invention will be described in detail using the drawings. Note that each of the embodiments described below represents a specific example of the present invention. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, steps, order of steps, etc. shown in the following embodiments are merely examples, and do not limit the present invention. Further, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims representing the most significant concept of the present invention will be described as arbitrary constituent elements. Further, each figure is not necessarily strictly illustrated. In each figure, substantially the same configurations are denoted by the same reference numerals, and overlapping explanations may be omitted or simplified.

(Embodiment 1)
First, a lighting device according to Embodiment 1 will be described.

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

The lighting device 10 is a lighting device that receives alternating current power whose phase is controlled by a dimmer 6. For example, the lighting device 10 is a lighting device that receives alternating current power whose phase is controlled by a dimmer 6. Used in 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 current, and is, for example, a solid-state light emitting element such as an LED or an EL (Electronic Luminescent).

The lighting circuit 20 is a circuit that supplies 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. Note that in this embodiment, the lighting circuit 20 is basically designed to be used in combination with a dimmer of an anti-phase control type. That is, the lighting circuit 20 does not include a resistor for suppressing rush current, which is required when used in combination with a positive phase control type dimmer.

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 rectifier element that prevents the direct current output from the rectifier circuit 21 from flowing backward.

The capacitor 23 is a smoothing capacitor that allows high frequency components included in the pulsating DC power (that is, voltage and current) output from the rectifier circuit 21 via the diode 22 to pass therethrough. The capacitor 23 not only smoothes the pulsating DC power output from the rectifier circuit 21 via the diode 22, but also smoothes the high frequency of the current that occurs when the dimmer 6 is a positive phase control type dimmer. The components are passed through 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 subjected to positive phase control or reverse phase control. In the present embodiment, the detection circuit 24 is a resistor inserted in a current path (specifically, a ground line) 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 controlled in positive phase or in reverse phase by converting the high frequency component of the current passing through the capacitor 23 into voltage using a resistor. do.

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

The control circuit 25 is a circuit that controls the current supply from the current supply circuit 26 to the light source 15 depending on the detection result by the detection circuit 24, or controls suppression of rush current from the rectifier circuit 21 to the current supply circuit 26. This is an example. In this 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 by the detection circuit 24. In other words, the control circuit 25 detects when the detection circuit 24 detects that the AC power input to the lighting circuit 20 is subjected to positive phase control (that is, the dimmer 6 is of a positive phase control type). , controls to stop the current supply from the current supply circuit 26 to the light source 15.

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 controlled in positive phase. As a result, the current supply from the current supply circuit 26 to the light source 15 is stopped. In this embodiment, the control circuit 25 is an IC that operates in response to the DC voltage output from the rectifier circuit 21 . The IC may be composed of a microcomputer including a ROM that stores a program, a RAM, a processor that executes the program, and an input/output circuit such as an A/D converter, or it may be composed of a dedicated logic circuit. Good too.

Next, the operation of the lighting device 10 according to the present embodiment configured as above will be explained. FIG. 2 is a flowchart showing the operation of lighting device 10 according to this 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 subjected to positive phase control (that is, the dimmer 6 is of a positive phase control type). (S10).

As a result, if the detection circuit 24 detects that the AC power input to the lighting circuit 20 is controlled in positive phase (Yes in S10), the control circuit 25 controls the current supply circuit 26 to supply light 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, if the detection circuit 24 does not detect that the AC power input to the lighting circuit 20 is under positive phase control (No in S10), the control circuit 25 controls the current supply from the current supply circuit 26 to the light source 15. continue. Specifically, the control circuit 25 maintains the switching of the switching element included in the current supply circuit 26 without stopping it.

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

FIG. 3 is a diagram illustrating a phase control method of the dimmer 6 shown in FIG. 1. (a) of FIG. 3 shows the AC voltage (solid line) and AC current (broken line) that are input to the lighting device 10 via the dimmer 6 when the phase control method of the dimmer 6 is a positive phase control method. An example waveform is shown below. (b) in FIG. 3 shows the AC voltage (solid line) and AC current (broken line) that are input to the lighting device 10 via the dimmer 6 when the phase control method of the dimmer 6 is an anti-phase control method. An example waveform is shown below.

As can be seen from FIG. 3(a), 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 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, voltage) generated in the detection circuit 24 is input to the control circuit 25 . Thereby, 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 larger than a predetermined threshold value.

On the other hand, as can be seen from FIG. 3(b), when the phase control method of the dimmer 6 is the reverse phase control method, the voltage output from the dimmer 6 rises slowly, so the lighting circuit No inrush current occurs at 20. Therefore, in the lighting circuit 20, since the current that passes through the capacitor 23 and flows through the detection circuit 24, which is a resistor, is small, 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 larger than a predetermined threshold, so that the phase control method of the dimmer 6 is not a positive phase control method (that is, the control circuit 25 detects that the voltage input from the detection circuit 24 is not larger than a predetermined threshold value). The phase control method is an anti-phase control method).

As described above, the lighting device 10 according to the present embodiment is a lighting device 10 that receives AC power whose phase is controlled by the dimmer 6, and includes a light source 15 and a lighting device that supplies current to the light source 15. The lighting circuit 20 includes a rectifier circuit 21 that converts AC power into DC power, a current supply circuit 26 that receives the DC power supplied from the rectifier circuit 21 and supplies current to the light source 15, and a lighting circuit 20 that converts AC power into DC power. A detection circuit 24 detects whether the AC power input to the circuit 20 is subjected to positive phase control or reverse phase control, and current is supplied from the current supply circuit 26 to the light source 15 depending on the detection result by the detection circuit 24. It has a control circuit 25 that controls supply or suppresses rush current from the rectifier circuit 21 to the current supply circuit 26. In this embodiment, the control circuit 25 performs control 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 being controlled in positive phase.

As a result, the lighting circuit 20 is designed to be compatible with a dimmer using an anti-phase control method, and if the AC power input to the lighting circuit 20 is controlled in positive phase, the detection circuit 24 detects. If so, 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 a positive phase control type dimmer, a large inrush current flows through the lighting circuit, causing the resistor forming the lighting circuit to generate heat, which impairs safety. This avoids the problem of being lost. In other words, lighting that can be used in combination with a dimmer with an anti-phase control method, and which prevents safety from being compromised even when connected to a dimmer with a positive phase control method. A device 10 and a 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 being controlled in positive phase. By doing so, the current supply from the current supply circuit 26 to the light source 15 is stopped.

As a result, when the lighting device 10 is connected to a positive phase control type dimmer, the current supply circuit 26 can be easily and reliably stopped switching of the switching element included in the current supply circuit 26. The current supply to the light source 15 is stopped.

Further, the detection circuit 24 is a resistor inserted in a path of current flowing between the rectifier circuit 21 and the current supply circuit 26. As a result, by adding a simple circuit such as providing a resistor to the lighting circuit 20, it is possible to prevent safety from being compromised when the lighting device 10 is connected to a positive phase control type dimmer.

(Embodiment 2)
Next, a lighting device according to Embodiment 2 will be described.

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

The lighting device 10a according to the present embodiment is different from the first embodiment in that it is designed to be used in combination with a dimmer of either a positive phase control method or a reverse phase control method. Hereinafter, differences from Embodiment 1 will be mainly explained.

The lighting device 10a includes a light source 15 and a lighting circuit 20a. The lighting circuit 20a is a circuit that supplies 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 the rush current generated from the rectifier circuit 21 when the lighting device 10a is connected to the dimmer 6 of the positive phase control system. This is a resistor inserted in the path of current flowing from the current supply circuit 26 to the current supply circuit 26.

The bypass switch 28 is a switch for disabling the operation of the suppression circuit 27, and when turned on (that is, in a conductive state), the current output from the rectifier circuit 21 flows bypassing the suppression circuit 27. make it possible.

The control circuit 25a performs suppression when 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 an anti-phase control type). Control is performed to disable the operation of the circuit 27. In other words, when the detection circuit 24 detects that the alternating current power input to the lighting circuit 20a is controlled in reverse phase, the control circuit 25 causes the current flowing from the rectifier circuit 21 to the current supply circuit 26 to pass through the suppression circuit 27. Control the flow so that it bypasses the constituent resistors. Specifically, the control circuit 25a controls the suppression circuit 27 by turning on the bypass switch 28 when the detection circuit 24 detects that the AC power input to the lighting circuit 20a is controlled in reverse phase. Disable the action.

Next, the operation of the lighting device 10a according to the present embodiment configured as above will be explained. 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 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 an anti-phase control type). (S20).

As a result, if the detection circuit 24 detects that the AC power input to the lighting circuit 20a is under anti-phase control (Yes in S20), the control circuit 25a disables the operation of the suppression circuit 27. Control is performed (S21). Specifically, the control circuit 25a disables the operation of the suppression circuit 27 by turning on the bypass switch 28.

On the other hand, if the detection circuit 24 does not detect that the AC power input to the lighting circuit 20a is subjected to reverse phase control (No in S20), the control circuit 25a does not disable the operation of the suppression circuit 27 (i.e. , the inrush current is suppressed by the suppression circuit 27) (S22). Specifically, the control circuit 25a maintains the operation of the suppression circuit 27 by turning off the bypass switch 28 (that is, turning it into a cutoff state).

As described above, in the lighting device 10a according to the present embodiment, the lighting circuit 20a includes the suppression circuit 27 that suppresses inrush current. The control circuit 25a performs control to disable the operation of the suppression circuit 27 when the detection circuit 24 detects that the AC power is subjected to anti-phase control, and controls the control circuit 25a to disable the operation of the suppression circuit 27. If it is not detected that there is a vehicle, the suppression circuit 27 is controlled to operate. Thereby, the lighting device 10a and the lighting circuit 20a can be realized which can operate appropriately regardless of whether the phase control method of the dimmer 6 is a positive phase control method or a reverse phase control method.

Further, the suppression circuit 27 is a resistor inserted in a path of current flowing from the rectifier circuit 21 to the current supply circuit 26. The control circuit 25a allows the current flowing from the rectifier circuit 21 to the current supply circuit 26 to bypass the resistor of the suppression circuit 27 when the detection circuit 24 detects that the AC power is under anti-phase control. Control as follows. As a result, the inrush current is suppressed by the resistor only in cases where an inrush current occurs.

Although the lighting device and 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. Unless departing from the gist of the present invention, various modifications that can be thought of by those skilled in the art may be made to Embodiments 1 and 2, or other embodiments may be constructed by combining some of the components of Embodiments 1 and 2. are also included within the scope of the present invention.

For example, in the first and second embodiments described above, the detection circuit 24 is realized by a resistor inserted into the ground line connecting the rectifier circuit 21 and the current supply circuit 26, but the connection position and components are different from each other. Not limited. FIG. 6 is a block diagram showing the configuration of a lighting device 10b according to a modification of the first embodiment. In the lighting circuit 20b included in this 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. connected in parallel. The control circuit 25b detects the potential at the connection point between the capacitor 23 and the detection circuit 24 to determine whether the dimmer 6 is a positive phase control system or a reverse phase control system.

Even in the lighting device 10b according to such a modification, the control circuit 25b can perform the same control as in the first embodiment. Note that 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, in the first and second embodiments, the detection circuit 24 is a resistor, but the detection circuit 24 is not limited to this. For example, by monitoring the voltage waveform output from the rectifier circuit 21 and determining whether the voltage waveform rises sharply or falls sharply, the AC power input to the lighting circuit can be controlled in positive phase. It may also be a detection circuit 24 that detects whether the phase control is being carried out or reverse phase control is being carried out.

6 Dimmer 10, 10a, 10b Lighting 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 (6)

A lighting device that receives AC power whose phase is controlled by a dimmer,
a light source and
and a lighting circuit that supplies 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 current to the light source;
a detection circuit that detects whether the AC power is subjected to positive phase control or reverse phase control;
a resistor inserted in a path of current flowing from the rectifier circuit to the current supply circuit;
and a control circuit that uses the resistor to control suppression of rush current from the rectifier circuit to the current supply circuit depending on a detection result by the detection circuit. The lighting circuit further includes a suppression circuit that suppresses the rush current,
The lighting device according to claim 1, wherein the control circuit performs control to disable the operation of the suppression circuit when the detection circuit detects that the AC power is subjected to anti-phase control. The control circuit is configured to cause a current flowing from the rectifier circuit to the current supply circuit to bypass the resistor when the detection circuit detects that the alternating current power is controlled in reverse phase. The lighting device according to claim 2, wherein the lighting device performs control. The lighting device according to any one of claims 1 to 3, wherein the detection circuit is a resistor inserted in a current path flowing between the rectifier circuit and the current supply circuit. The lighting circuit further includes a capacitor that smoothes the DC power,
The lighting device according to any one of claims 1 to 3, wherein the detection circuit is a resistor connected in series with the capacitor. A lighting circuit that supplies current to a 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 current to the light source;
a detection circuit that detects whether the AC power is controlled in positive phase or in reverse phase;
a resistor inserted in a path of current flowing from the rectifier circuit to the current supply circuit;
and a control circuit that uses the resistor to control suppression of rush current from the rectifier circuit to the current supply circuit depending on a detection result by the detection circuit.

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