DE102015120027A1 - Lighting assembly and this luminaire using - Google Patents

Abstract

The present invention provides a lighting device that can suppress that light from a light source as a lighting object is further emitted when an AC power source is changed from an on-state to an off-state, and can accurately detect that the light source , which is electrically connected to a pair of output terminals, is removed when the AC power source is in an on state, and can provide a luminaire in which the lighting assembly is used. In a lighting device (10) according to the present invention, a control circuit (6) is configured to stop controlling a first switching element (Q1) and to control the second switching element to be in an on state in a predetermined time period (T ) is from a time point when a detected voltage (V1) is greater than or equal to a threshold voltage. The control circuit (6) is configured to re-control the on-off of the first switching element (Q1) when the predetermined period has elapsed. The control circuit (6) is configured when the detected voltage (V1) reaches a value greater than or equal to the threshold voltage at a predetermined frequency or more frequently, stops controlling the first switching element (Q1), and controls the second switching element to is in an off state. A limiting circuit (9) is configured to limit an output voltage applied to a light source (20) when an AC current (I0) is not input to a rectifier circuit (3).

Description

FIELD OF THE INVENTION

The present invention relates generally to lighting assemblies and lights, and more particularly to a lighting assembly that turns on a light source and a light that utilizes the lighting assembly.

GENERAL PRIOR ART

Switching devices have conventionally been proposed which operate light-emitting diodes (LEDs) ( JP 2004-536434 A , hereinafter referred to as "Document 1").

The switching device disclosed in Document 1 is provided with a pair of input terminals, a pair of output terminals, and a SEPIC (Single-Ended Primary Inductance Converter). Document 1 discloses a capacitor (buffer capacitor) as electronic components constituting the SEPIC.

The buffer capacitor is connected between the pair of output terminals.

A power source is electrically connected to the pair of input terminals in the switching device disclosed in Document 1. An LED (Light Emitting Diode) is electrically connected to the pair of output terminals in the switching device disclosed in Document 1. Document 1 discloses that the supply current source is an AC power source.

Incidentally, the light may be further emitted from the LED by charge accumulated in the buffer capacitor when the supply current source is changed from an on-state to an off-state in the switching device disclosed in Document 1.

In the switching element disclosed in Document 1, it is difficult to accurately detect that the LED electrically connected to the pair of output terminals is removed when the LED is removed while the supply power source is in an on state.

BRIEF SUMMARY OF THE INVENTION

An object of the present invention is to provide a lighting device that can suppress that light from a light source as a lighting object is further emitted when an AC power source is changed from an on-state to an off-state, and can detect accurately in that the light source electrically connected to a pair of output terminals is removed when the AC power source is in an on state, and providing a luminaire in which the lighting assembly is used.

A lighting assembly according to an aspect of the present invention is intended to provide power from an AC power source to turn on a light source. The lighting assembly includes a pair of input terminals, a pair of output terminals, a rectifier circuit, a conversion circuit, a detection circuit, a limiting circuit, a discharge circuit, and a control circuit. The AC power source configured to output an AC power may be electrically connected to the pair of input terminals. The light source can be electrically connected to the pair of output terminals. The rectifier circuit is configured to generate a pulsating current by full wave rectification of the AC current. The conversion circuit is configured to convert the pulsating current from the rectifier circuit into a DC current and output the DC current to the pair of output terminals. The detection circuit is configured to detect an output voltage between the pair of output terminals and output a detected voltage proportional to the output voltage. The limiting circuit is configured to limit the output voltage. The control circuit is configured to control the conversion circuit and the discharge circuit. The rectifier circuit includes a pair of first input ends and a pair of first output ends. The pair of first input ends are electrically connected to the pair of input terminals, respectively. The pair of first output ends is electrically connected to the conversion circuit. The conversion circuit is a SEPIC (Single-Ended Primary Inductance Converter). The conversion circuit includes a pair of second input ends, a pair of second output ends, a first capacitor, a first series circuit, a second series circuit, and a third series circuit. The first capacitor is connected between the pair of second input ends. The first series circuit includes a first inductor and a first switching element connected in series and connected in parallel with the first capacitor. The second series circuit includes a second capacitor and a second inductor connected in series and connected in parallel to the first switching element. The third series circuit includes a diode and a third capacitor connected in series and connected in parallel with the second inductor. The third capacitor is connected between the pair of second output ends. The third capacitor includes a high potential side terminal and a low potential side connection. The high potential side terminal is electrically connected to a first output terminal of the pair of output terminals. The low potential side terminal is electrically connected to a second output terminal of the pair of output terminals through the discharge circuit. The limiting circuit includes a series circuit of a first resistor and a second resistor. The limiting circuit is electrically connected to the third capacitor. The first resistor is electrically connected between the pair of output terminals. The second resistor is electrically connected in parallel with the discharge circuit. The discharge circuit includes a series circuit of a second switching element and a third resistor. The discharge circuit is configured to discharge charge accumulated in the third capacitor. The control circuit is configured to individually control the on-off of the first switching element and on-off of the second switching element. The control circuit is configured to stop controlling the on-off of the first switching element and control the second switching element to be in an on state so that the charge accumulated in the third capacitor discharges through the discharge circuit in a predetermined time period starting at a time becomes when the detected voltage is greater than or equal to a threshold voltage. The control circuit is configured to re-control the on-off of the first switching element when the predetermined period has elapsed. The control circuit is configured when the detected voltage reaches a value greater than or equal to the threshold voltage by a predetermined number of times or more for controlling the on-off of the first switching element and controlling the second switching element to be in an off-state. The limiting circuit is configured to limit the output voltage to be lower than a lighting voltage of the light source by controlling the second switching element to be in an off state when the AC current is not input to the rectifier circuit.

A luminaire according to an aspect of the present invention includes the lighting assembly and the light source that can be turned on by the lighting assembly.

The lighting device according to one aspect of the present invention can suppress further that light from the light source as the lighting object is emitted when the AC power source is changed from an on-state to an off-state. The lighting assembly according to an aspect of the present invention can accurately detect that the light source electrically connected to the pair of output terminals is removed when the AC power source is in an on state.

The luminaire according to one aspect of the present invention allows to provide a luminaire provided with a lighting assembly that can suppress that further light is emitted from a light source as a lighting object when the AC power source is from an on-state to an off-state State, and can accurately detect that the light source electrically connected to the pair of output terminals is removed when the AC power source is in an on state.

BRIEF DESCRIPTION OF THE DRAWINGS

The figures show one or more implementations according to the present teachings, by way of example only, not limitations. In the figures, like reference numerals refer to the same or similar elements.

1 Fig. 12 is a circuit diagram of a luminaire provided with a lighting assembly of an embodiment 1;

2 Fig. 10 is a timing chart illustrating an operation of the lighting device of the embodiment;

3 Fig. 10 is a timing chart illustrating another operation of the lighting device of the embodiment; and

4 FIG. 12 is a partially cutaway schematic perspective view diagram of the luminaire provided with the lighting assembly of the embodiment in a design state.

DESCRIPTION OF THE EMBODIMENTS

A lighting assembly 10 An embodiment will next be described with reference to FIG 1 to 3 explained.

The lighting assembly 10 is configured to turn on a light source 20 ,

The light source 20 For example, with several (four in 1 ) light-emitting solid state elements 21 Mistake. Each of the plurality of solid-state light-emitting elements 21 is for example a light emitting diode (LED). The electrical connection of the plurality of solid-state light-emitting elements 21 is, for example, a series connection. The emission color of the plurality of solid-state light-emitting elements 21 is white, for example.

Although the emission color of the plurality of solid-state light-emitting elements 21 the light source 20 set to white, the emission color is not limited to this. At the in 1 The example illustrated is the electrical connection of the plurality of solid-state light-emitting elements 21 a series connection, but is not limited thereto. The electrical connection of the plurality of solid-state light-emitting elements 21 For example, it may be a parallel circuit or a connection scheme combining a series connection and a parallel connection. The light-emitting solid-state elements 21 in the light source 20 are LEDs, but are not limited to these. For example, the solid-state light-emitting elements 21 Be semiconductor laser elements, organic electroluminescent elements or the like. At the in 1 example shown is the light source 20 with the several solid-state light-emitting elements 21 provided, but can with only one light-emitting solid state element 21 be provided.

The lighting assembly 10 is with a pair of input terminals 1A . 1B , a pair of output terminals 2A . 2 B , a rectifier circuit 3 , a conversion circuit 4 a detection circuit 12 , a limiting circuit 9 , a constant current circuit 5 and a control circuit 6 Mistake. The constant current circuit 5 is with a discharge circuit 13 Mistake.

An AC power source 50 is electrically connected between the pair of input terminals 1A . 1B connected. The AC power source 50 is for example a commercial power source. The AC power source 50 outputs an AC current (an AC voltage) I0. The lighting assembly 10 does not contain the AC power source 50 as a constituent element.

The light source 20 is electrically connected between the pair of output terminals 2A . 2 B connected. The lighting assembly 10 does not contain the light source 20 as a component.

The series connection 3 is configured to, for example, a full wave rectification of the AC current I0 from the AC power source 50 perform. The rectifier circuit 3 is for example a diode bridge. In other words, the rectifier circuit 3 configured to generate a pulsating current I1 by full wave rectification of the AC current I0. The rectifier circuit 3 is configured to output the pulsating current I1 to the conversion circuit 4 ,

The rectifier circuit 3 is with a pair of input ends (pair of first input ends) 3A . 3B and a pair of output ends (pair of first output ends) 3C . 3D Mistake. The couple entrance ends 3A . 3B the rectifier circuit 3 is each electrical to the pair of input terminals 1A . 1B connected. The pair of exit ends 3C . 3D the rectifier circuit 3 is electrical with the conversion circuit 4 connected. More precisely, the pair is output ends 3C . 3D the rectifier circuit 3 each electrically with a pair of input ends 4A . 4B the conversion circuit 4 connected. At the couple entrance ends 3A . 3B they can be connection terminals that are connected to conductive wires, each with the pair of input terminals 1A . 1B are connected. Alternatively, the pair may have input ends 3A . 3B Be part of the conductive wires, each with the pair of input terminals 1A . 1B are connected. At the pair of exit ends 3C . 3D they may be connection terminals to which conductive wires are connected, each to the pair of input ends 4A . 4B or they may be part of the conductive wires, each with the pair of input ends 4A . 4B are connected.

The conversion circuit 4 is configured to convert the pulsating current I1 from the rectifier circuit 3 into a DC current I2. The conversion circuit 4 is configured to output the DC current I2 to the pair of output terminals 2A . 2 B , The conversion circuit 4 is a SEPIC (Single-Ended Primary Inductance Converter).

The conversion circuit 4 is for example a capacitor (first capacitor) C1 and a series circuit (first series circuit) 42 of an inductor (first inductor) L1 and a switching element (first switching element) Q1. The conversion circuit 4 is with a series connection (second series connection) 43 a capacitor (second capacitor) C2 and an inductor (second inductor) L2 and a series circuit (third series circuit) 44 of a diode D1 and a capacitor (third capacitor) C3 and provided with two resistors R1 and R2.

The conversion circuit 4 continues with the pair of input ends (pair of second input ends) 4A . 4B and the pair of output ends (pair of second output ends) 4C . 4D Mistake. The couple entrance ends 4A . 4B is each electrical with the pair of output ends 3C . 3D the rectifier circuit 3 connected. The pair of exit ends 4C . 4D is each electrical to the pair of output terminals 2A . 2 B connected. At the couple entrance ends 4A . 4B These can be connection connections, with which conductive wires or they can be part of conductive wires. The pair of exit ends 4C . 4D may be connection terminals to which conductive wires are connected, or they may be part of conductive wires.

The first switching element Q1 is connected to a first main terminal 451 , a second main line 452 and a control terminal 453 Mistake. The first switching element Q1 is, for example, an enhancement type n-channel MOSFET. In the first switching element Q1 is the first main terminal 451 a drain connection, the second main connection 452 is a source connection and the control connection 453 is a gate connection.

The first capacitor C1 is between the pair of input ends 4A . 4B the conversion circuit 4 connected.

The first series connection 42 from the first inductor L1 and the first switching element Q1 is electrically connected between both ends of the first capacitor C1. In other words, the first series connection 42 provided with the first inductor L1 and the first switching element Q1. The first inductor L1 and the first switching element Q1 are connected in series. The first series connection 42 is connected in parallel to the first capacitor C1.

The second series connection 43 from the second capacitor C2 and the second inductor L2 is electrically connected between the drain terminal (first main terminal 451 ) and the source (second main connection 452 ) of the first switching element Q1. The gate connection (control connection 453 ) of the first switching element Q1 is electrically connected to the control circuit via the resistor R1 6 connected. The gate terminal of the first switching element Q1 is connected via the resistor R2 to the source terminal of the first switching element Q1. In other words, the second series circuit 43 provided with the second capacitor C2 and the second inductor L2. The second capacitor C2 and the second inductor L2 are connected in series. The second series connection 43 is connected in parallel to the first switching element Q1.

The third series connection 44 of the diode D1 and the third capacitor C3 is electrically connected between both ends of the second inductor L2. The anode of the diode D1 is electrically connected to the second inductor L2. The cathode of the diode D1 is electrically connected to the third capacitor C3. In other words, the third series circuit 44 provided with the diode D1 and the third capacitor C3. The diode D1 and the third capacitor C3 are connected in series. The third series connection 44 is connected in parallel to the second inductor L2.

The third capacitor C3 is between the pair of output ends 4C . 4D the conversion circuit 4 connected. The third capacitor C3 is connected to a high potential side terminal 461 and a low potential side terminal 462 Mistake.

The high potential side connection 461 of the third capacitor C3 is electrically connected to the output terminal 2A connected. The low potential side connection 462 of the third capacitor C3 is via the discharge circuit 13 and the constant current circuit 5 electrically with the output terminal 2 B connected.

The detection circuit 12 is configured to detect an output voltage Vout between the pair of output terminals 2A . 2 B (hereinafter, "output voltage Vout") and outputting a detected voltage V1 proportional to the output voltage Vout. The detection circuit 12 is, for example, a resistance voltage divider circuit.

The limiting circuit 9 is configured to limit the output voltage Vout. The limiting circuit 9 includes a series circuit of a resistor (first resistor) R9 and a resistor (second resistor) R10. The limiting circuit 9 is electrically connected to the third capacitor C3. Explained in specific terms, a first end of the first resistor R9 is electrically connected to the high potential side terminal 461 of the third capacitor C3. A second end of the first resistor R9 is electrically connected to a first end of the second resistor R10. A second end of the second resistor R10 is electrically connected to the low potential side terminal 462 of the third capacitor C3.

The first resistor R9 is electrically connected between the pair of output terminals 2A . 2 B connected. The second resistor R10 is electrically parallel to the discharge circuit 13 connected.

The constant current circuit 5 is configured by the conversion circuit 4 output DC current I2 to make a constant current. As a result, flickering in the light can be suppressed, leaving an ordinary person, that of the light source 20 viewed radiated light, perceives no flicker in the light. Here is the constant current of the light source 20 for example, a current that has been made sufficiently constant so that an ordinary person receives that from the light source 20 viewed radiated light, no flickering perceives in the light. The constant current circuit 5 will be described in detail below.

The control circuit 6 is configured to control the conversion circuit 4 and the constant current circuit 5 , For example, the control circuit 6 with a control unit (a controller) 7 , three resistors R3 to R5, a capacitor C4 and a diode D2. The control unit 7 is for example a microcomputer.

The control unit 7 is electrically connected to a not shown power source circuit. The current source circuit is configured to output a DC voltage Vd. The current source circuit may be provided with a secondary winding magnetically coupled to the primary winding consisting of the first inductor L1 and configured to generate the DC voltage Vd with an induced voltage generated in the secondary winding.

The control unit 7 is electrically connected to a gate terminal of the first switching element Q1 via the resistor R1. The control unit 7 is electrical with the low potential side connection 462 of the third capacitor C3.

The control unit 7 is electrically connected to the first end of the resistor R3. The second end of the resistor R3 is electrically connected to the first end of the capacitor C4. The second end of the capacitor C4 is electrically connected to the control unit 7 connected. The second end of the resistor R3 is electrically connected to the first end of the resistor R4. The second end of the resistor R4 is electrically connected to the second end of the capacitor C4. The first end of the resistor R4 is electrically connected to the constant current circuit 5 connected. In the control circuit 6 the two resistors R3 and R4 and the capacitor C4 form a smoothing circuit.

The control unit 7 is electrically connected to the constant current circuit through the diode D2 5 connected. An anode of the diode D2 is electrically connected to the control unit 7 connected. A cathode of the diode D2 is electrically connected to the constant current circuit 5 connected.

The control unit 7 is electrically connected to the constant current circuit through the resistor R5 5 connected.

The control circuit 6 owns a configuration that the control unit 7 including three resistors R3 to R5, the capacitor C4 and the diode D2. The control circuit 6 however, it is not limited to the above configuration. In the control circuit 6 becomes a microcomputer as the control unit 7 used, but is the control circuit 6 not limited thereto, and for example, a control IC or the like may be used.

The constant current circuit 5 is with a discharge circuit 13 , two resistors R6 and R7 and three capacitors C5 to C7 and an integrated circuit 8th Mistake.

The discharge circuit 13 is configured to discharge the charge accumulated in the third capacitor C3. The discharge circuit 13 includes a series circuit of a resistor (third resistor) R3 and a varactor unit (varying circuit) 11 configured to vary the magnitude of the DC current I2 generated by the conversion circuit 4 is issued. The variation unit 11 is, for example, an enhancement type n-channel MOSFET.

The integrated circuit 8th is with a first connection pin 81 , a second connection pin 82 , a third connection pin 83 , a fourth connection pin 84 , a fifth connection pin 85 , a sixth connection pin 86 , a seventh connection pin 87 and an eighth connection pin 88 Mistake. The integrated circuit 8th is, for example, an operational amplifier (commercially available part number: NJM2904, from New Japan Radio Co., Ltd.). The integrated circuit 8th is with a first operational amplifier 89 and a second operational amplifier, not shown. In the integrated circuit 8th is the first connection pin 81 an output terminal of a first operational amplifier 89 , The second connection pin 82 is an inverting input terminal of the first operational amplifier 89 , the third connection pin 83 is a non-inverting input terminal of the first operational amplifier 89 and the fourth connection pin 84 is a negative power supply connection. In the integrated circuit 8th is the fifth connection pin 85 a non-inverting input terminal of the second operational amplifier, the sixth connection pin 86 is an inverting input terminal of the second operational amplifier, the seventh connection pin 87 is an output terminal of the second operational amplifier and the eighth connection pin 88 is a positive power source connection. The second operational amplifier is in the integrated circuit 8th not used. Consequently, in 1 the second operational amplifier is not shown. The graphic symbols of the integrated circuit 8th in 1 denote an operational amplifier (above-mentioned part number: NJM2904) of New Japan Radio Co., Ltd.

The first connection pin 81 the integrated circuit 8th is electrically connected to a gate of an n-channel MOSFET, referred to as the varying unit 11 is used. The first connection pin 81 the integrated circuit 8th is electrically connected to the second connection pin via resistor R6 82 the integrated circuit 8th connected. The first operational amplifier 89 and resistor R6 constitute an error amplifier in the constant current circuit 5 , For convenience of explanation, the n-channel MOSFET may be used as the varying unit 11 is briefly referred to as "MOSFET".

The second connection pin 82 the integrated circuit 8th is electrically connected to a source terminal of the MOSFET through the resistor R7. The second connection pin 82 the integrated circuit 8th is electrically connected to the low potential side terminal via the capacitor C5 462 of the third capacitor C3 in the conversion circuit 4 connected. The resistor R7 and the capacitor C5 constitute a filter circuit in the constant current circuit 5 ,

The third connection pin 83 the integrated circuit 8th is electrically connected to a first end of the resistor R4 in the control circuit 6 connected.

The fourth connection pin 84 and the fifth connection pin 85 the integrated circuit 8th are electrical with the low potential side connection 462 of the third capacitor C3.

The sixth connection pin 86 the integrated circuit 8th is electrical with the seventh connection pin 87 the integrated circuit 8th connected.

The eighth connection pin 88 the integrated circuit 8th is electrically connected to the power source circuit. The eighth connection pin 88 the integrated circuit 8th is electrically connected to the low potential side terminal through the capacitor C6 462 of the third capacitor C3.

A drain of the MOSFET (Variation Unit 11 ) is electrically connected to the output terminal 2 B connected. The drain of the MOSFET is electrically connected to the low potential side terminal through the capacitor C7 462 of the third capacitor C3. Furthermore, the drain of the MOSFET is through the resistor R5 of the control unit 6 electrically with the control circuit 7 connected. The source of the MOSFET is electrically connected to the low potential side terminal through resistor R8 462 of the third capacitor C3.

At the in 1 The example shown is the constant current circuit 5 configured to communicate with the discharge circuit 13 , the two resistors R6 and R7, the three capacitors C5 to C7 and the integrated circuit 8th is provided, but is the constant current circuit 5 not limited to this configuration. The constant current circuit 5 may be configured by having a discharge circuit equal to the discharge circuit 13 , the two resistors R6 and R7, the three capacitors C5 to C7 and the integrated circuit 8th is provided. In this case, the discharge circuit 13 separately from the constant current circuit 5 in the lighting assembly 10 intended. That is, the discharge circuit 13 becomes as the above discharge circuit of the constant current circuit 5 used. Demensprechend, the lighting assembly 10 be small in comparison with the discharge circuit 13 , and it is separate from the constant current circuit 5 intended.

The control circuit 6 is configured to individually control the on-off of the first switching element Q1. In other words, the control circuit 6 configured to output a control signal (hereinafter referred to as "first control signal") to the first switching element Q1. Explained in specific terms is the control unit 7 configured to output the first control signal S1 to the first switching element Q1. The first control signal S1 is a signal for controlling the on-off of the first switching element Q1. The first control signal is, for example, a pulse width modulation (PWM) signal.

The conversion circuit 4 is configured to output the DC current I2 by on-off control of the switching element Q1 by the control circuit 6 ,

Next, the operation of the conversion circuit 4 explained.

If in the conversion circuit 4 When the first switching element Q1 is brought from an off state to an on state, a current flows in a path via the high potential side terminal of the first capacitor C1, the first inductor L1, the first switching element Q1, and the low potential side terminal of the first capacitor C1. If in the conversion circuit 4 When the first switching element Q1 is brought from an off-state to an on-state, a current also flows in a path via the high potential side terminal of the second capacitor C2, the first switching element Q1, the second inductor L2, and the low potential side terminal of the second capacitor C2 , When in the conversion circuit 4 the first switching element Q1 is in an on state, accumulates magnetic energy correspondingly in the first inductor L1 and in the second inductor L2.

If in the conversion circuit 4 In addition, when the first switching element Q1 is brought from an on-state to an off-state, a back electromotive force is generated in the first inductor L1. As a result, a current flows in the conversion circuit 4 in a way about that first end of the first inductor L1, the second capacitor C2, the diode D1, the third capacitor C3, the first capacitor C1, and a second end of the first inductor L1. If in the conversion circuit 4 the first switching element Q1 is brought from an on-state to an off-state, a back electromotive force is generated in the second inductor L2, and thus a current flows in a path via the first end of the second inductor L2, the diode D1, the third capacitor C3 and a second end of the second inductor L2. As a result, the DC current I2 can be output when in the conversion circuit 4 the voltage V4 across the third capacitor C3 is greater than or equal to a predetermined voltage.

The control circuit 6 is configured to control the on-off of the MOSFET.

The conversion circuit 4 is a SEPIC; accordingly, for example, a ripple component having a period twice that of the AC power source 50 , superimposed on the DC current I2. That's why the lighting assembly is 10 with the constant current circuit 5 Mistake.

The control circuit 6 is configured, the varying unit 11 such that the magnitude of the DC current I2 is controlled by the varying unit 11 to one for the light source 20 suitable size is made. That is, the control circuit 6 is configured, the varying unit 11 to control so that the size of the DC current I2 is set so that the constant current to the light source 20 is delivered. Explained in specific terms causes the control circuit 6 in that the MOSFET operates in a region (active region) where the drain current varies in proportion to the change in the gate-source voltage. In other words, the control circuit 6 configured to cause the MOSFET to function as a resistance component.

The control circuit 6 is configured to output a control signal (hereinafter, "second control signal") S2 to the third connection pin 83 the integrated circuit 8th in the constant current circuit 5 , Explained in specific terms is the control circuit 7 configured to output the second control signal S2 to the third connection pin 83 the integrated circuit 8th , The second control signal S2 is a signal for controlling a to the non-inverting input terminal of the first operational amplifier 89 in the integrated circuit 8th applied reference voltage V2. The second control signal S2 is, for example, a PWM signal.

The smoothing circuit of the control circuit 6 is configured to smooth the output voltage of the second control signal S2 generated by the control unit 7 is issued. The smoothing circuit is configured to output the smoothed voltage as the reference voltage V2 to the third connection pin 83 the integrated circuit 8th , Therefore, the control circuit 6 modify the voltage value of the reference voltage V2 by changing the duty ratio of the second control signal S2.

Next, the operation of the constant current circuit will be described 5 explained.

In the constant current circuit 5 the current Ia flows in one way via the high potential side terminal 461 of the third capacitor C3, the output terminal 2A , the light source 20 , the output terminal 2 B , the MOSFET, the third resistor R8, and the low potential side terminal 462 of the third capacitor C3 when the MOSFET is in an on state.

In the constant current circuit 5 A voltage is generated at the third resistor R8 when the current Ia flows in the third resistor R8. In the constant current circuit 5 the voltage at the third resistor R8 is applied to the second connection pin via the filter circuit (resistor R7 and capacitor C5) 82 the integrated circuit 8th created.

The first operational amplifier 89 in the integrated circuit 8th gives the output voltage to the varying unit in this way 11 that the voltage V3 applied to the inverting input terminal and the second reference voltage V2 applied to the non-inverting input terminal coincide with each other.

The variation unit 11 makes the size of DC current I2, that of the conversion circuit 4 is output, based on the magnitude of the output voltage provided by the integrated circuit 11 is issued, variable. Explained with specific terms, the gate-source voltage varies in the varying unit 11 with changes in the output voltage passing through the integrated circuit 8th is issued. As a result, the drain current in the varying unit varies 11 proportional to changes in the gate-source voltage, and thus it becomes possible to reduce the magnitude of the DC current I2 generated by the conversion circuit 4 is issued, to vary. Accordingly, the magnitude of the DC current I2 generated by the conversion circuit 4 in the varying unit 11 that is, the magnitude of the current I2 that is in the light source 20 flows, be brought to a size suitable for the light source 20 suitable is.

In the lighting assembly 10 For example, the MOSFET is made to function as a resistance component, and thus the magnitude of the DC current I2 can be varied by the varying unit 11 be brought to a size suitable for the light source 20 suitable is. Accordingly, it becomes possible in the lighting assembly 10 the ripple component in the DC current I2 from the conversion circuit 4 to reduce. That is, through the conversion circuit 4 output DC current I2 can be made into a constant current, which is responsible for the light source 20 in the lighting assembly 10 suitable. As a result, for example, by the light source 20 radiated flicker in the lighting assembly 10 be suppressed. It also becomes possible in the lighting assembly 10 for example, to prevent the occurrence of flickering in video images captured by an imaging device such as a video camera in an environment where the light source 20 through the lighting assembly 10 is turned on.

To the ripple component in the by the conversion circuit 4 is lowered, the electrostatic capacitance of the third capacitor C3 is preferably set smaller than the electrostatic capacitances of the first and second capacitors C1 and C2 in the lighting assembly 10 , For example, the electrostatic capacity of the first capacitor C1 is set to 0.1 μF. For example, the electrostatic capacity of the second capacitor C2 is set to 0.1 μF. For example, the electrostatic capacity of the third capacitor C3 is set to 530 μF.

Incidentally, the inventors of the present application devised a lighting device of Comparative Example 1, which includes a pair of input terminals, a pair of output terminals, a rectifier, a conversion circuit, and a control circuit. The pair of input terminals, the output terminals, the rectifier circuit, the conversion circuit, and the control circuit of Comparative Example 1 are each identical to the pair of input terminals 1A . 1B , the output terminals 2A . 2 B , the rectifier circuit 3 , the conversion circuit 4 and the control circuit 6 , The lighting assembly of Comparative Example 1 does not include the constant current circuit 5 and the control circuit 6 the lighting assembly 10 ,

The inventors of the present application have devised in the lighting assembly of Comparative Example 1 that it takes a comparatively long time for the charge accumulated in the third capacitor C3 to discharge when the AC current from the AC power source is no longer input to the rectifier circuit , As a result, in the lighting device of Comparative Example 1, there is a possibility that light from the light source 20 even if, for example, the AC power is no longer input from the AC power source. The time at which the AC power source is turned off denotes a timing at which, for example, the power source switch, not shown, connected between the AC power source and the first input terminal or between the AC power source and the second input terminal is turned off. For the convenience of explanation, the time at which the AC current is no longer input from the AC power source to the rectifier circuit will be referred to as "when the AC power source is turned off".

The lighting assembly 10 contains the limiting circuit 9 , as described above.

The limiting circuit 9 is configured to limit the output voltage Vout to be lower than the lighting voltage of the light source 20 if the AC power source 50 is off. The Bestromungsspannung the light source 20 here denotes the minimum voltage, which is an energization of the light source 20 allows. When each of the plurality of solid-state light-emitting elements 21 For example, is an LED, the Bestromungsspannung the light source 20 the total forward voltage (forward direction voltage) in the plurality of solid-state light emitting elements 21 ,

The resistance of the resistor R9 and the resistance of the resistor R10 are set so that the output voltage Vout is below the lighting voltage of the light source 20 lies when the AC power source 50 is off. The control circuit 6 controls the constant current circuit 5 such that outputting the output voltage from the integrated circuit 8th to the varying unit 11 is stopped when the AC power source 50 is turned off.

The control circuit 6 is configured to output a control signal (hereinafter, "third control signal") S3 to the second connection pin 82 the integrated circuit 8th in the constant current circuit 5 if the AC power source 50 is off. Explained in specific terms is the control unit 7 configured to output the third control signal S3 to the second connection pin 82 the integrated circuit 8th if the AC power source 50 is off. The third control signal S3 is a signal for controlling a to the inverting input terminal of the first operational amplifier 89 in the integrated circuit 8th applied voltage V3. The third control signal S3 is for example a pulse signal. The control unit 7 is configured to modify the signal level of the third control signal S3 from a low level to a high level when the AC power source 50 is off. As a result, it becomes the lighting assembly 10 possible to output the output voltage from the integrated circuit 8th to the varying unit 11 stop when the AC power source 50 is off. For the lighting assembly 10 the output voltage Vout may be through the limiting circuit 9 be made lower than the Bestromungsspannung the light source 20 if the AC power source 50 is off. Therefore, it becomes possible to have continued emission of light by the light source 20 to prevent when the AC power source 50 in the lighting assembly 10 is off. The method to detect when the AC power source 50 through the control circuit 6 may be, for example, detecting the time at which the DC voltage Vd applied to the control unit 7 is lower than a specified voltage.

In the lighting device of Comparative Example 1, when the light source is removed while the AC current connected to the pair of output terminals is input to the rectifier circuit from the AC power source, the voltage on the third capacitor C3 rises. As a result, the output voltage increases. For the convenience of explanation, the case where the light source connected to the pair of output terminals is removed is referred to as "the light source is removed".

In the lighting device of Comparative Example 1, it is difficult to detect that the light source is removed when the light source is removed while inputting the AC power from the AC power source into the rectifier circuit. For the convenience of explanation, the time when the AC power is inputted from the AC power source into the rectifier circuit will be referred to as "when the AC power source is turned on".

The inventors of the present application have devised a lighting assembly of Comparative Example 2 which includes a detection circuit having the same configuration as the detection circuit 12 the lighting assembly 10 has.

A control circuit in the lighting assembly of Comparative Example 2 is configured to stop the on-off control of a first switching element. As a result, the lighting assembly of Comparative Example 2 can detect that the light source is removed when the light source is removed while the AC power source is in an on state. Upon detecting that the light source is removed, the lighting assembly of Comparative Example 2 can stop operation of the conversion circuit and suppress that the voltage on the third capacitor C3 increases.

Incidentally, in the lighting device of Comparative Example 2, there is a possibility that the voltage on the third capacitor increases when the voltage input to the rectifier circuit (hereinafter, "input voltage") is changed. Therefore, the lighting device of Comparative Example 2 stops the on-off control of the first switching element when the detected voltage is greater than or equal to a threshold voltage by changing the changed input voltage. That is, there is a possibility that the lighting device of Comparative Example 2 erroneously detects that the light source is removed when the input voltage is changed. For example, the time when the input voltage is changed indicates "RMS input voltage is changed from 100 V to 242 V".

The control circuit 6 in the lighting assembly 10 is configured to stop controlling the on-off of the first switching element Q1 at a timing when a predetermined period T (see FIG 2 ) elapses from a time point when the detected voltage V1 is greater than or equal to a threshold voltage Vt (see 2 ). Explained in specific terms, the control circuit 6 configured to stop outputting the first control signal S1 to the first switching element Q1 in the predetermined time period T starting from the time when the detected voltage V1 becomes equal to or higher than the threshold voltage Vt. The predetermined period T is set to, for example, two seconds.

The control circuit 6 is configured to control the on-off of the first switching element Q1 again when the predetermined period T has elapsed. Explained in specific terms is the control circuit 6 configured to output the first control signal S1 to the first switching element Q1 when the predetermined period T elapses.

The control circuit 6 is configured, when the detected voltage V1 at the predetermined frequency or more often (for example, three times) reaches the value equal to or greater than the threshold voltage Vt to stop controlling the on-off of the first switching element Q1.

The control circuit 6 is configured when the detected voltage V1 with the predetermined Frequency or more often the value greater than or equal to the threshold voltage Vt reaches to control the MOSFET to be in an off state.

Explained in specific terms is the control circuit 6 configured, when the detected voltage V1 at the predetermined frequency or more often reaches the value equal to or greater than the threshold voltage Vt, the constant current circuit 5 so that the voltage V3 applied to the inverting input terminal of the first operational amplifier 89 is applied, is above the reference voltage V2.

Explained in specific terms is the control unit 7 configured to stop outputting the second control signal S2 to the smoothing circuit when the detected voltage V1 reaches the predetermined frequency or more often the value equal to or greater than the threshold voltage Vt. The control unit 7 is configured to modify the signal level of the third control signal S3 from a low level to a high level when the detected voltage V1 reaches the predetermined frequency or more often the value equal to or greater than the threshold voltage Vt. As a result, the control circuit 6 outputting the output voltage from the first operational amplifier 89 the integrated circuit 8th to the varying unit 11 stop when the detected voltage V1 reaches the predetermined frequency or more often the value equal to or greater than the threshold voltage Vt. Therefore, the control circuit 6 control the MOSFET to be in an off state. That's why it's in the lighting assembly 10 When the input voltage Vin is changed, it is possible to incorrectly detect that the light source 20 is removed, suppress. In other words, the lighting assembly can accurately detect that the light source 20 is removed when the AC power source 50 is in an on state. The control circuit 6 is configured to control the MOSFET to be in an off state when the detected voltage V1 reaches the predetermined frequency or more often the value equal to or greater than the threshold voltage Vt. Therefore, the lighting assembly 10 suppress that the output voltage Vout is increased.

The reference symbol Ia in 2 denotes the one in the light source 20 flowing electricity. The reference symbol S1 in 2 denotes the first control signal. The reference symbol V2 in 2 denotes the in the non-inverting input terminal of the operational amplifier 89 in the integrated circuit 8th entered reference voltage. The reference symbol V3 in 2 denotes the in the inverting input terminal of the operational amplifier 89 in the integrated circuit 8th entered reference voltage. The reference symbol V1 in 2 denotes the detected voltage from the detection circuit 12 , The reference symbol t1n in 2 indicates the time when the light source 20 Will get removed. The reference symbols t2, t4 and t6 are the times when the detected voltage V1 is greater than or equal to the threshold voltage Vt. The reference symbols t3 and t5 are the timings when the predetermined period has elapsed.

The lighting assembly 10 is configured, the accumulated in the third capacitor C3 charge with the discharge circuit 13 so that the detected voltage V1 for the predetermined period T is smaller than the threshold voltage Vt. That is, the control circuit 6 is configured to control the MOSFET to be in an on state so that the charge accumulated in the third capacitor C3 in the predetermined time period T starts from the time when the detected voltage V1 becomes equal to or higher than the threshold voltage Vt , by the discharge circuit 13 unloaded.

Explained in specific terms, the control circuit 6 configured, the constant current circuit 5 to control that in the inverting input terminal of the first operational amplifier 89 input voltage V3 in the predetermined time period T, starting from the time when the detected voltage V1 is greater than or equal to the threshold voltage Vt, is smaller than the reference voltage V2. In particular, the control unit 7 configured to output the second control signal S2 to the smoothing circuit in the predetermined time period T, starting from the time when the detected voltage V1 becomes equal to or higher than the threshold voltage Vt. The control unit 7 is configured to fix the signal level of the third control signal S3 as a low level in the predetermined time period T starting from the time point when the detected voltage V1 becomes equal to or higher than the threshold voltage Vth. As a result, the control circuit 6 the output voltage from the first operational amplifier 89 in the integrated circuit 8th to the varying unit 11 output. Therefore, the control circuit 6 Control the MOSFET to be in an on state. Accordingly, the lighting assembly 10 suppress that the detected voltage V1 becomes equal to or greater than the threshold voltage Vth when the predetermined period T has elapsed. Therefore, the lighting assembly 10 accurately detect that the light source 20 is removed when the AC power source 50 is in an on state.

The control circuit 6 is preferably configured to operate the MOSFET in the active region, such that the current Ia through the MOSFET provides a current for energizing the light source 20 with the lowest light output level of the light source 20 in the predetermined time period T, starting from the time when the detected voltage V1 becomes equal to or higher than the threshold voltage Vth. As a result, the lighting assembly can 10 the Bestromungszustand the light source 20 in the predetermined time period T, starting from the time when the detected voltage V1 becomes equal to or higher than the threshold voltage Vth. Therefore, the lighting assembly can quickly change an output of the light source 20 Suppress emitted light compared to the case when the light source 20 is changed from the off state to the Bestromungszustand.

In the lighting assembly 10 At this time, the effective value of the input voltage Vin is changed from 100 V to 242 V, the voltage at the third capacitor C3 is increased, and then the detected voltage V1 is increased (see FIG 3 ).

The control circuit 6 is configured to control the on-off of the first switching element Q1 in the predetermined time period T (see FIG 3 ) starting from the time when the detected voltage V1 becomes equal to or higher than the threshold voltage Vt (see FIG 3 ). The control circuit 6 is configured to control the on-off of the first switching element Q1 again when the predetermined period T has elapsed. As a result, even if the input voltage Vin is changed, it is in the lighting device 10 possible to suppress the wrong detection that the light source 20 is removed.

The reference symbol Vin in 3 indicates the to the rectifier circuit 3 applied voltage. The reference symbol Ia in 3 denotes the one in the light source 20 flowing electricity. The reference symbol S1 in 3 denotes the first control signal. The reference symbol V2 in 3 denotes the input to the non-intervening input terminal of the operational amplifier 89 in the integrated circuit 8th entered reference voltage. The reference symbol V3 in 3 denotes the in the inverting (intervening) input terminal of the operational amplifier 89 in the integrated circuit 8th entered reference voltage. The reference symbol V1 in 3 denotes the detected voltage from the detection circuit 12 , The reference symbol t7 in 3 denotes the timing when the input voltage Vin is changed. The reference symbol t9 in 9 denotes the time when the predetermined period T elapses.

The lighting assembly explained above 10 is with the pair of input terminals 1A . 1B , the pair output connections 2A . 2 B , the rectifier circuit 3 and the conversion circuit 4 Mistake. The rectifier circuit 3 subjects the AC current I0 to a full wave rectification. The conversion circuit 4 is configured, the pulsating current I1 from the rectifier circuit 3 to convert the DC current I2 and the DC current I2 to the pair of output terminals 2A . 2 B issue. The lighting assembly 10 is with the detection circuit 12 and the limiting circuit 9 Mistake. The detection circuit 12 is configured to detect the output voltage Vout between the pair of output terminals 2A . 2 B and outputting the detected voltage V1 in proportion to the output voltage Vout. The limiting circuit 9 is configured to limit the output voltage Vout. The lighting assembly is with the discharge circuit 13 and the control circuit 6 Mistake. The control circuit 6 is configured to control the conversion circuit 4 and the discharge circuit 13 , The pair of input terminals 1A . 1B is electrically connected to the pair of input ends 3A . 3B the rectifier circuit 3 connected. The pair of exit ends 3C . 3D the rectifier circuit 3 is electrically connected to the pair of input ends 4A . 4B the conversion circuit 4 connected. The conversion circuit 4 is a SEPIC. The conversion circuit 4 is provided with the first capacitor C1 which is between the pair of input ends 4A . 4B the conversion circuit is connected, and the first series circuit 42 from the first inductor L1 and the first switching element Q1, connected between both ends of the first capacitor C1. The conversion circuit 4 is also with the second series connection 43 from the second capacitor C2 and the second inductor L2, between the first main terminal 451 and the second main line 452 the first switching element Q1 connected. The conversion circuit 4 is with the third series connection 44 from the diode D1 and the third capacitor C3, connected between both ends of the second inductor L2. The third capacitor C3 is between the pair of output ends 4C . 4D the conversion circuit 4 connected. The high potential side connection 461 of the third capacitor C3 is electrically connected to the first output terminal 2A of the pair of output terminals 2A . 2 B connected. The low potential side connection 462 of the third capacitor C3 is via the discharge circuit 13 electrically to the second output terminal 2 B of the pair of output terminals 2A . 2 B connected. The limiting circuit 9 includes the series connection of the first resistor R9 and the second resistor R10. The limiting circuit 9 is electrically connected in parallel to the third capacitor C3. The first resistor R9 is electrically connected between the pair output terminals 2A . 2 B connected. The second resistor R10 is electrically parallel to the discharge circuit 13 connected. The discharge circuit 13 includes the series connection of the third resistor R8 and the second switching element (MOSFET, VARATING unit 11 ). The discharge circuit 13 is configured to discharge the charge accumulated in the third capacitor C3. The control circuit 6 is configured to individually control the on-off of the first switching element Q1 and the on-off of the second switching element. The control circuit 6 is configured to stop controlling the on-off of the first switching element Q1 in the predetermined time period T starting from the time point when the detected voltage V1 from the detection circuit 12 greater than or equal to the threshold voltage Vt. The control circuit 6 is configured to control the second switching element to be in an on state so that the charge accumulated in the third capacitor C3 is discharged through the discharge circuit 13 is discharged in the predetermined time period T starting from the time when the detected voltage V1 becomes greater than or equal to the threshold voltage Vt. The control circuit 6 is configured to control the on-off of the first switching element Q1 again when the predetermined period T has elapsed. The control circuit 6 is configured when the detected voltage V1 reaches the value greater than or equal to the threshold voltage Vt at the predetermined frequency or more frequently to stop controlling the on-off of the first switching element Q1. The control circuit 6 is configured when the detected voltage V1 reaches the value greater than or equal to the threshold voltage Vt at the predetermined frequency or more frequently to control the second switching element to be in an off state. The limiting circuit 9 is configured to limit the output voltage Vout to be smaller than the lighting voltage of the light source 20 as the energizing object, by the control circuit 6 controls the second switching element to be in an off state when the AC current I0 is not in the rectifier circuit 3 is entered.

In other words, the lighting assembly explained above 10 Power from the AC power source 50 to turn on the light source 20 deliver. The lighting assembly 10 is with the pair of input terminals 1A . 1B , the pair output connections 2A . 2 B , the rectifier circuit 3 , the conversion circuit 4 , the detection circuit 12 , the limiting circuit 9 , the discharge circuit 13 and the control circuit 6 Mistake. The AC power source 50 that outputs the AC current I0 is electrically connected to the pair of input terminals 1A . 1B connected. The light source 20 is electrically connected to the pair of output terminals 2A . 2 B connected. The rectifier circuit 3 is configured to generate the pulsating current I1 by full-wave rectification of the AC current I0. The conversion circuit 4 is configured to convert the pulsating current I1 from the rectifier circuit 3 in the DC current I2 and outputting the DC current I2 to the pair of output terminals 2A . 2 B , The detection circuit 12 is configured to detect the output voltage Vout between the pair of output terminals 2A . 2 B and outputting the detected voltage V1 in proportion to the output voltage Vout. The limiting circuit 9 is configured to limit the output voltage Vout. The control circuit 6 is configured to control the conversion circuit 4 and the discharge circuit 13 , The rectifier circuit 3 is connected to the pair of first input ends (pair of input ends 3A . 3B ) and the pair of first output ends (pair of output ends 3C . 3D ) Mistake. The pair of first input ends are electrically connected to the pair of input terminals, respectively 1A . 1B connected. The pair of first output ends is electrically connected to the conversion circuit 4 connected. The conversion circuit 4 is a SEPIC. The conversion circuit 4 is connected to the pair of second input ends (pair of input ends 4A . 4B ), the pair of second output ends (pair of output ends 4C . 4D ), the first capacitor C1, the first series circuit 42 , the second series connection 43 and the third series connection 44 Mistake. The pair of second input ends are electrically connected to the pair of first output ends of the rectifier circuit, respectively 3 connected. The pair of second output ends are electrically connected to the pair of output terminals, respectively 2A . 2 B connected. The first capacitor C1 is connected between the pair of first input ends. The first series connection 42 includes the first inductor L1 and the first switching element Q1, connected in series, and connected in parallel to the first capacitor C1. The second series connection 43 includes the second capacitor C2 and the second inductor L2, connected in series, and is connected in parallel to the first switching element Q1. The third series connection 44 includes the diode D1 and the third capacitor C3, connected in series, and is connected in parallel to the second inductor L2. The third capacitor C3 is connected between the pair of second output ends. The third capacitor C3 includes the high potential side and low potential side terminals. The high potential side connection 461 is electrically connected to the first output terminal 2A of the pair of output terminals 2A . 2 B connected. The low potential side connection 462 is about the discharge circuit 13 electrically to the second output terminal 2 B of the pair of output terminals 2A . 2 B connected. The limiting circuit 9 includes the series connection of the first resistor R9 and the second resistor R10. The limiting circuit 9 is electrically connected to the third capacitor C3. The first resistor R9 is electrically connected between the pair of output terminals 2A . 2 B connected. The second resistor R10 is electrically parallel to the discharge circuit 13 connected. The discharge circuit 13 includes the series connection of the second switching element and the third resistor R8. The discharge circuit 13 is configured to discharge charge accumulated in the third capacitor C3. The control circuit 6 is configured to individually control the on-off of the first switching element Q1 and on-off of the second switching element. The control circuit 6 is configured to stop controlling the on-off of the first switching element Q1 and to control the second switching element to be in an on state so that charge accumulated in the third capacitor C3 starts by the discharge circuit in the predetermined time period T. is discharged at the time when the detection circuit 12 is greater than or equal to the threshold voltage Vt. The control circuit 6 is configured to control the on-off of the first switching element Q1 again when the predetermined period T has elapsed. The control circuit 6 is configured when the detected voltage V1 reaches the value greater than or equal to the threshold voltage Vt at the predetermined frequency or more frequently, to stop controlling the on-off of the first switching element Q1 and to control the second switching element to be in an off state State is. The limiting circuit 9 is configured to limit the output voltage Vout to be smaller than the lighting voltage of the light source 20 by the control circuit 6 controls the second switching element to be in an off state when the AC current I0 is not in the rectifier circuit 3 is entered.

As a result, the lighting assembly can 10 Suppress that further light from the light source 20 is emitted as the energizing object when the AC power source 50 is changed from an on state to an off state. The lighting assembly 10 can accurately detect that the light source 20 which are electrically connected to the pair of output terminals 2A . 2 B is disconnected when the AC power source is removed 50 is in an on state.

Preferably, the second switching element has a transistor structure. The control circuit 6 is configured to operate the second switching element in an active region, so that the current through the second switching element of the current for the energization of the light source 20 at the lowest light output level of the light source 20 in the predetermined time period T starting from the time when the detected voltage V1 becomes equal to or higher than the threshold voltage Vth. As a result, the lighting assembly can 10 the light source 20 is maintained in the energization state in the predetermined time period T starting from the time when the detected voltage V1 becomes equal to or higher than the threshold voltage Vt. Therefore, the lighting assembly 10 a quick change of the output of the light source 20 suppress emitted light when the predetermined period T has elapsed, compared to the case when the light source 20 is changed from the off state to the Bestromungszustand.

Next, referring to 4 one with the lighting assembly 10 provided light 30 described.

The lamp 30 is, for example, a downlight. The lamp 30 is configured, for example, in a ceiling material 40 to be arranged. Explained in specific terms is the light 30 for example, configured in a hole 41 embedded in the ceiling material 40 is trained.

The lamp 30 is for example with the lighting assembly 10 , the light source 20 , a connection line 31 and a lamp body 32 Mistake.

The light source 20 is with a reflective plate 33 provided by the plurality of solid-state light-emitting elements 21 reflected light reflects.

The lighting assembly 10 is over the connection line 31 electrically with the light source 20 (several solid-state light-emitting elements 21 ) connected.

The light source 20 is on the lamp body 32 assembled. Explained in specific terms is the lamp body 32 configured so that the light source 20 is mounted on it.

In the example shown in the figure, the lamp body 32 configured so that the light source 20 on the lamp body 32 is mounted, the latter is not limited to this configuration. The luminaire body 32 can be configured so that the lighting assembly 10 and the light source 20 on the lamp body 32 are mounted. In the example shown in the figure, in particular, the light 30 a lamp of the type with a separate power supply, in which the lighting assembly 10 and the light source 20 are arranged separately, but is the light 30 not limited to this. The lamp 30 can be an integrated power supply type luminaire with the lighting assembly 10 and the light 20 on the lamp body 32 are mounted.

The lamp 30 is not limited to a downlight and may be, for example, a ceiling light, a spotlight or the like.

The lamp explained above 30 is with the lighting assembly 10 and the light source 20 provided by the lighting assembly 10 can be turned on. In the light 30 Therefore, a light can be provided, which is the lighting assembly 10 possesses, which can suppress that continues the light from the light source 20 is emitted when the AC power source 50 is changed from an on-state to an off-state, and can accurately detect that the light source 20 which are electrically connected to the pair of output terminals 2A . 2 B is disconnected when the AC power source is removed 50 is in an on state.

As shown in the embodiment described above, a lighting assembly ( 10 ) Power from an AC power source ( 50 ) for switching on a light source ( 20 ) deliver. The lighting assembly ( 10 ) contains a pair of input ports ( 1A . 1B ), a pair of output terminals ( 2A . 2 B ), a rectifier circuit ( 3 ), a conversion circuit ( 4 ), a detection circuit ( 12 ), a limiting circuit ( 9 ), a discharge circuit ( 13 ) and a control circuit ( 6 ). The AC power source ( 50 ) configured to output an AC current (I0) can be electrically connected to the pair of input terminals (I0). 1A . 1B ) get connected. The light source ( 20 ) can be electrically connected to the pair of output terminals ( 2A . 2 B ) get connected. The rectifier circuit ( 3 ) is configured to generate a pulsating current (I1) by full wave rectification of the AC current (I0). The conversion circuit ( 4 ) is configured to convert the pulsating current (I1) from the rectifier circuit (FIG. 3 ) into a DC-current (I2) and for outputting the DC-current (I2) to the pair of output terminals (I2) 2A . 2 B ). The detection circuit ( 12 ) is configured to detect an output voltage (Vout) between the pair of output terminals (FIG. 2A . 2 B ) and outputting a detected voltage (V1) proportional to the output voltage (Vout). The limiting circuit ( 9 ) is configured to limit the output voltage (Vout). The control circuit ( 6 ) is configured to control the conversion circuit ( 4 ) and the discharge circuit ( 13 ). The rectifier circuit ( 3 ) includes a pair of first input ends and a pair of first output ends. The pair of first input ends are electrically connected respectively to the pair of input terminals ( 1A . 1B ) connected. The pair of first output ends is electrically connected to the conversion circuit ( 4 ) connected. The conversion circuit ( 4 ) is a SEPIC (Single-Ended Primary Inductance Converter). The conversion circuit ( 4 ) includes a pair of second input ends, a pair of second output ends, a first capacitor (C1), a first series circuit ( 42 ), a second series circuit ( 43 ) and a third series circuit ( 44 ). The pair of second input ends are electrically connected respectively to the pair of first output ends of the rectifier circuit ( 3 ) connected. The pair of second output ends is electrically connected to the pair of output terminals (FIG. 2A . 2 B ) connected. The first capacitor (C1) is connected between the pair of second input ends. The first series connection ( 42 ) includes an inductor (L1) and a first switching element (Q1) connected in series and connected in parallel with the first capacitor (C1). The second series circuit ( 43 ) includes a second capacitor (C2) and a second inductor (L2) connected in series and connected in parallel with the first switching element (Q1). The third series connection ( 44 ) includes a diode (D1) and a third capacitor (C3) connected in series and connected in parallel with the second inductor (L2). The third capacitor (C3) is connected between the pair of second output ends. The third capacitor (C3) contains a high-potential-side connection ( 461 ) and a low-potential-side connection ( 462 ). The high potential side connection ( 461 ) is electrically connected to a first output terminal ( 2A ) of the pair of output terminals ( 2A . 2 B ) connected. The low-potential side connection ( 462 ) is via the discharge circuit ( 13 ) electrically connected to a second output terminal ( 2 B ) of the pair of output terminals ( 2A . 2 B ) connected. The limiting circuit ( 9 ) includes a series connection of a first resistor (R9) and a second resistor (R10). The limiting circuit ( 9 ) is electrically connected to the third capacitor (C3). The first resistor (R9) is electrically connected between the pair of output terminals (R9). 2A . 2 B ). The second resistor (R10) is electrically parallel to the discharge circuit ( 13 ). The discharge circuit ( 13 ) includes a series connection of a second switching element and a third resistor (R8). The discharge circuit ( 13 ) is configured to discharge the charge accumulated in the third capacitor (C3). The control circuit ( 6 ) is configured to individually control the on-off of the switching element (Q1) and on-off of the second switching element. The control circuit ( 6 ) is configured to stop controlling the on-off of the first switching element (Q1) and to control the second switching element to be in an on state so that the charge accumulated in the third capacitor (C3) is discharged through the discharge circuit ( 13 ) is discharged in a predetermined time period (T) starting with a time when the detected voltage (V1) from the detection circuit ( 12 ) becomes greater than or equal to a threshold voltage (Vt). The control circuit ( 6 ) is configured to re-control the on-off of the first switching element (Q1) when the predetermined period (T) has elapsed. The control circuit ( 6 ) is configured when the detected voltage (V1) is greater than or equal to equal to or more frequently equal to the threshold voltage (Vt) at a predetermined frequency, to stop controlling the on-off of the first switching element (Q1) and to control the second switching element to be in an off-state. The limiting circuit ( 9 ) is configured to limit the output voltage (Vout) so that it is smaller than a lighting voltage of the light source ( 20 ) by the control circuit ( 6 ) controls the second switching element to be in an off state when the AC current (I0) does not enter the rectifier circuit ( 3 ) is entered.

The lighting assembly ( 10 ) according to the first aspect can suppress that further light from the light source ( 20 ) is emitted as the energizing object when the AC power source ( 50 ) is changed from an on-state to an off-state. The lighting assembly ( 10 ) can accurately detect that the light source ( 20 ) electrically connected to the pair of output terminals ( 2A . 2 B ) is removed when the AC power source ( 50 ) is in an on state.

In the lighting assembly ( 10 ) according to the second aspect of the present invention, realized in combination with the first aspect, the second switching element has a transistor structure. The control circuit ( 6 ) is configured to operate the second switching element in an active region, so that the current through the second switching element is a current for the energization of the light source ( 20 ) at the lowest light output level of the light source ( 20 ) in the predetermined time period (T) starting from the time when the detected voltage (V1) becomes equal to or higher than the threshold voltage (Vt).

The lighting assembly ( 10 ) according to the second aspect, the light source ( 20 ) is maintained in the energization state in the predetermined time period (T) starting from the time when the detected voltage (V1) becomes equal to or higher than the threshold voltage (Vt). Accordingly, the lighting assembly ( 10 ) a rapid change of the output of the light source ( 20 ) emitted light when the predetermined period (T) has elapsed, compared to the case when the light source ( 20 ) is changed from the discrimination state to the energization state.

A lamp ( 30 ) according to the third aspect of the present invention includes: the lighting assembly ( 10 ) according to the first or second aspect and the light source ( 20 ) illuminated by the lighting assembly ( 10 ) can be turned on.

In the lamp ( 30 ) according to the third aspect, a luminaire may be provided, which the lighting assembly ( 10 ), which can suppress that further the light from the light source ( 20 ) is emitted when the AC power source ( 50 ) is changed from an on-state to an off-state, and can accurately detect that the light source ( 20 ) electrically connected to the pair of output terminals ( 2A . 2 B ) is removed when the AC power source ( 50 ) is in an on state.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• JP 2004-536434 A [0002]

Claims (3)

Lighting assembly ( 10 ) for supplying power from an AC power source ( 50 ) for switching on a light source ( 20 ), comprising: a pair of input terminals ( 1A . 1B ), with which the AC power source ( 50 ) configured to output an AC current (I0), can be electrically connected; a pair of output terminals ( 2A . 2 B ), with which the light source ( 20 ) can be electrically connected; a rectifier circuit ( 3 ) configured to generate a pulsating current (I1) by full wave rectification of the AC current (I0); a conversion circuit ( 4 ) configured to convert the pulsating current (I1) from the rectifier circuit (FIG. 3 ) into a DC-current (I2) and for outputting the DC-current (I2) to the pair of output terminals (I2) 2A . 2 B ); a detection circuit ( 12 ) configured to detect an output voltage (Vout) between the pair of output terminals (FIG. 2A . 2 B ) and outputting a detected voltage (V1) proportional to the output voltage (Vout); a limiting circuit ( 9 ) configured to limit the output voltage (Vout); a discharge circuit ( 13 ); and a control circuit ( 6 ) configured to control the conversion circuit ( 4 ) and the discharge circuit ( 13 ), wherein the rectifier circuit ( 3 ) Comprising: a pair of first input ends each electrically connected to the pair of input terminals ( 1A . 1B ) are connected; and a pair of first output ends electrically connected to the conversion circuit ( 4 ), the conversion circuit ( 4 ) is a SEPIC (Single-Ended Primary Inductance Converter), wherein the conversion circuit ( 4 ) Comprises: a pair of second input ends each electrically connected to the pair of first output ends of the rectifier circuit ( 3 ) are connected; a pair of second output ends, each electrically connected to the pair of output terminals ( 2A . 2 B ) are connected; a first capacitor (C1) connected between the pair of second input ends; a first series connection ( 42 ) comprising a first inductor (L1) and a first switching element (Q1) connected in series and connected in parallel with the first capacitor (C1); a second series connection ( 43 ) comprising a second capacitor (C2) and a second inductor (L2) connected in series and connected in parallel with the switching element (Q1); and a third series circuit ( 44 ) comprising a diode (D1) and a third capacitor (C3) connected in series and connected in parallel with the second inductor (L2), the third capacitor (C3) being connected between the pair of second output ends, wherein the third capacitor (C3) has a high-potential-side connection ( 461 ) and a low-potential-side connection ( 462 ), the high-potential-side connection ( 461 ) electrically connected to a first output terminal ( 2A ) of the pair of output terminals ( 2A . 2 B ), the low-potential side connection ( 462 ) electrically connected to a second output terminal ( 2 B ) of the pair of output terminals ( 2A . 2 B ) is connected via the discharge circuit ( 13 ), wherein the limiting circuit ( 9 ) comprises a series connection of a first resistor (R9) and a second resistor (R10), wherein the limiting circuit ( 9 ) is electrically connected to the third capacitor (C3), wherein the first resistor (R9) is electrically connected between the pair of output terminals (C3). 2A . 2 B ), wherein the second resistor (R9) is electrically parallel to the discharge circuit ( 13 ), wherein the discharge circuit ( 13 ) comprises a series connection of a second switching element and a third resistor (R8), wherein the discharge circuit ( 13 ) is configured for discharging charge accumulated in the third capacitor (C3), the control circuit ( 6 ) is configured to individually control the on-off of the first switching element Q1 and on-off of the second switching element, wherein the control circuit ( 6 ) is configured to stop controlling the on-off of the first switching element Q1 and to control the second switching element to be in an on state, so that charge accumulated in the third capacitor C3 is discharged through the discharge circuit (FIG. 13 ) is discharged in a predetermined time period (T) starting with a time when the detection circuit ( 12 ) becomes greater than or equal to a threshold voltage (Vt), the control circuit ( 6 ) is configured to control the on-off of the first switching element Q1 again when the predetermined period (T) has elapsed, the control circuit ( 6 ) is configured, when the detected voltage (V1) reaches a value greater than or equal to the threshold voltage (Vt) by a predetermined number of times or more, to stop controlling the on-off of the first switching element Q1 and control the second switching element to make it is in an off state, and wherein the limiting circuit ( 9 ) is configured to limit the output voltage (Vout) to be smaller than a lighting voltage of the light source ( 20 ), by the control circuit ( 6 ) that controls the second switching element to be in an off state when the AC current (I0) not in the rectifier circuit ( 3 ) is entered. Lighting assembly ( 10 ) according to claim 1, wherein the second switching element has a transistor structure, and wherein the control circuit ( 6 ) is configured to operate the second switching element in an active region, so that a current through the second switching element is a current for energizing the light source ( 20 ) with a lowest light output level of the light source ( 20 ) in the predetermined time period (T) starting from the time when the detected voltage (V1) becomes equal to or higher than the threshold voltage (Vt). Lamp ( 30 ), comprising: a lighting assembly ( 10 ) according to one of claims 1 or 2; and the light source ( 20 ) illuminated by the lighting assembly ( 10 ) can be turned on.

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