JP2012022880A - Power supply device and illumination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device which has an output correction function for correcting output according to cumulative lighting time of a light source, and which is capable of easily switching between rated output and corrected output.SOLUTION: A power supply device comprises: power supply circuits 28a and 28b which turn on light sources 12a and 12b; an output correction circuit 54 which corrects outputs of the power supply circuits 28a and 28b according to cumulative lighting time of the light sources 12a and 12b such that the light outputs from the light sources 12a and 12b are constant; and a control circuit 44 which, in response to a specific operation, switches to a rated output mode for forcing the power supply circuits 28a and 28b to output a rated voltage, and which restores the outputs of the power supply circuits 28a and 28b to the corrected output corresponding to the initial stage of the cumulative lighting time during recovery from the rated output mode in response to a specific operation.

Description

  Embodiments described herein relate generally to a power supply device having an output correction function for correcting an output in accordance with the cumulative lighting time of a light source, and an illumination device using the power supply device.

  Conventionally, for example, a lamp such as a fluorescent lamp is brightest at the beginning of use even when the output from the power supply device that lights the lamp is constant, and the brightness decreases as the cumulative lighting time elapses. It has the characteristics to go.

  However, it is desirable to always maintain a constant illuminance in an illumination space illuminated with a lamp. Therefore, in the power supply device that turns on the lamp, at the initial stage, the output of the power supply device is turned on at an output lower than the rated output, and the brightness of the lamp is controlled to be darker than the all-light state, and cumulative As the brightness of the lamp decays as the lighting time elapses, the lamp brightness is reduced at any cumulative lighting time from the beginning by increasing the power supply output to approach the rated output. There is a power supply device that has an output correction function (initial illuminance correction function) that is always constant and is controlled so that constant illuminance is always maintained.

JP 2005-353382 A

  For power supply units with output correction function, when the output of the power supply unit is controlled to be lower than the rated output, such as at the initial stage, the output of the power supply unit cannot be output at the rated output. And adjustment work is not possible.

  The present invention has been made in view of such a point, and can easily output a rated output or return from a rated output to a corrected output while including an output correcting function for correcting the output according to the cumulative lighting time of the light source. It is an object of the present invention to provide a power supply device and a lighting device using the power supply device.

  The power supply device of the embodiment includes a power supply circuit that turns on the light source. An output correction circuit is provided for correcting the output of the power supply circuit in accordance with the cumulative lighting time of the light source so that the light output of the light source is constant. A rated output mode in which the power supply circuit is rated output by a specific operation is provided, and a control circuit is provided that returns the output of the power supply circuit to a corrected output corresponding to the initial cumulative lighting time when returning from the rated output mode by the specific operation.

  According to the present invention, since the power output circuit is in the rated output mode in which the power circuit is rated output by a specific operation, the power circuit can easily output the rated power, and the check operation and adjustment work at the rated output can be performed. When returning from the rated output mode by, the output of the power circuit can be returned to the corrected output corresponding to the initial cumulative lighting time.

It is a circuit diagram of the power supply device used for the illuminating device which shows one Embodiment. It is a block diagram of a power supply device same as the above. It is a graph which shows the relationship between the output of a power supply device same as the above, and accumulation lighting time.

  Hereinafter, an embodiment will be described with reference to FIGS. 1 to 3.

  In FIG. 2, reference numeral 11 denotes an illuminating device. The illuminating device 11 is a plurality of light sources 12 a and 12 b that are, for example, two systems of loads or load circuits, and DC power is supplied to each of the light sources 12 a and 12 b as load power. One power supply device 13 is provided. The illumination device 11 may be, for example, one in which two light sources 12a and 12b and a power supply device 13 are provided in one instrument body, or the light sources 12a and 12b are provided in separate instrument bodies, respectively. And the power supply device 13 may be electrically connected.

  Each of the light sources 12a and 12b is configured by connecting a plurality of LEDs 15 in series as semiconductor light emitting elements.

  The power supply device 13 includes an elongated cylindrical case 17 made of, for example, aluminum, and a substrate unit 18 accommodated in the case 17, with one end of the case 17 being an input unit 19 and the other end being an output unit 20. Yes. The input unit 19 is connected to a pair of power supply lines 22 for supplying a commercial AC power supply 21, and is connected to a pair of light control light 24 for inputting a light control signal such as a PWM signal from an external light control device 23. The output unit 20 is connected to two pairs of connection lines 25a and 25b that connect the light sources 12a and 12b.

  The board unit 18 includes a plurality of boards 27a and 27b which are formed in the same shape and are elongated, and power supply circuits 28a and 28b are mounted on the boards 27a and 27b, respectively. Specifically, the main circuits 29a and 29b of the power supply circuits 28a and 28b are mounted on the two boards 27a and 27b, respectively, and only one (first) board 27a is shared by the plurality of power supply circuits 28a and 28b. A common circuit 30 having a circuit configuration that can be configured is mounted, and in order to make the common circuit 30 available on the other (second) substrate 27b side, a pair of connecting wires 31 is provided between the two substrates 27a and 27b. Are electrically connected.

  The substrates 27a and 27b have a power input portion 32 formed on one end side in the longitudinal direction and a load output portion 33 formed on the other end side, with the power input portion 32 side of these substrates 27a and 27b facing each other. It is stored in case 17. In case 17, power input wiring 34 connected to power line 22 of commercial AC power supply 21 is connected between input part 19 of case 17 and power input part 32 of boards 27a and 27b, respectively. Between the input unit 19 and the power input unit 32 of one substrate 27a or other input unit, a signal input wiring 35 connected to the light control light 24 of the light control device 23 is connected, and the output unit 20 of the case 17 Load output wirings 36a and 36b connected to the connection lines 25a and 25b of the light sources 12a and 12b are connected between the substrates 27a and 27b.

  The common circuit 30 includes a surge absorbing circuit 38 that protects the circuit by absorbing abnormal voltage such as a lightning surge, and a dimming signal processing circuit 39 that processes the dimming signal input from the dimming device 23. ing.

  Next, FIG. 1 shows a circuit diagram of the power supply circuits 28a and 28b mounted on the boards 27a and 27b of the lighting device 11.

  First, the power supply circuit 28a mounted on one substrate 27a will be described.

  A surge absorption circuit 38 that is a part of the common circuit 30 is connected to the commercial AC power supply 21, and an input terminal of a full-wave rectification circuit 41 that performs full-wave rectification of the AC power supply that forms a part of the main circuit 29a is connected. ing. The output terminal of the full wave rectifier circuit 41 is connected to the input terminal of a power factor correction (PFC) circuit 42 mainly composed of a boost chopper that boosts the DC voltage. The DC voltage is stepped down to the output terminal of the power factor correction circuit 42. A DC converter 43 mainly including a step-down chopper that performs a DC voltage conversion operation is sequentially connected, and one light source 12a is connected to an output terminal of the DC converter 43.

  The power factor correction circuit 42 and the DC converter 43 are controlled by a control circuit 44. The control circuit 44 receives an output voltage detected by the voltage detection unit 45 from the output terminal of the power factor correction circuit 42, and further receives a dimming signal from the dimmer 23, and the power factor improvement circuit 42 and the DC The light source 12a is dimmed by controlling the converter 43.

  A dimming signal processing circuit 39 that is a part of the common circuit 30 is connected to the dimming device 23. The dimming signal processing circuit 39 includes a full-wave rectification circuit 47 that full-wave rectifies the dimming signal input from the dimming device 23, and a protection circuit 48 that performs current adjustment and overvoltage protection.

  A photodiode 50 of a photocoupler 49 constituting a part of the main circuit 29a is connected to the output terminal of the dimming signal processing circuit 39. The phototransistor 51 of the photocoupler 49 is connected to the dimming signal output circuit 52, and the dimming signal is output from the dimming signal output circuit 52 to the control circuit 44.

  Therefore, on one substrate 27a, a full-wave rectifier circuit 41, a power factor correction circuit 42, a DC converter 43, a control circuit 44, a voltage detection unit 45, a photodiode 50 of a photocoupler 49, a dimming signal output circuit 52, etc. The main circuit 29a including the common circuit 30 including the surge absorbing circuit 38 and the dimming signal processing circuit 39 is mounted.

  The control circuit 44 also includes an output correction circuit 54 that is an initial illuminance correction circuit that corrects the output of the power supply circuit 28a in accordance with the cumulative lighting time of the light source 12a so that the light output of the light source 12a is constant.

  Incidentally, the LED 15 of the light source 12a has a long life, but has a characteristic that the light output, which is a light beam at the end of the predetermined life, is about 70% of the initial time.

Therefore, the output correction circuit 54, as shown in FIG. 3, the initial time t ₀ of the lighting of the light source 12a, the output of the power supply circuit 28a corrects an output of 70% of the rated output, the accumulated lighting time of the light source 12a By increasing the output of the power circuit 28a so as to approach the rated output as time passes, the output of the power circuit 28a is set to 100% of the rated output at the predetermined end of life t _n of the light source 12a. Therefore, control is performed so that the brightness of the light source 12a is always constant and constant illuminance is maintained at any cumulative lighting time.

  In order to make this possible, the output correction circuit 54 stores a table that defines the relationship between the correction of the output of the power supply circuit 28a corresponding to the characteristics of the LED 15 of the light source 12a and the cumulative lighting time or the current correction in the power supply circuit 28a. A storage unit that stores the ratio of the output with respect to the rated output, a timer circuit that measures the cumulative lighting time of the light source 12a, and the like. The accumulated lighting time by this timer circuit is not reset by simply removing the light source 12a from the power supply circuit 28a.For example, along with the replacement of the light source 12a, the reset switch is operated, the reset signal sent through the light control 24 A reset is possible by inputting, turning on / off a specific power source, and the like. The storage unit and the timer circuit may be included in the control circuit 44, or may be provided separately from the output correction circuit 54 and the control circuit 44.

The control circuit 44 is normally controlled in an output correction mode in which the output correction circuit 54 corrects the output of the power supply circuit 28a in accordance with the cumulative lighting time, and the initial time t when the counting of the cumulative lighting time has not started. ₀ or in the accumulated lighting initial accumulated lighting time predetermined timing is corresponding to the range is also the initial time t ₀ have been started in time, the rated output mode to a rated output power circuit 28a in the output correction mode by a specific operation, In addition, it has a function of returning the output of the power supply circuit 28a to a correction output corresponding to the initial cumulative lighting time when returning from the rated output mode to the output correction mode by a specific operation. In addition, at the time point t ₁ when the cumulative lighting time has exceeded a predetermined time, the rated output mode is set so that the power circuit 28a in the output correction mode is rated output by a specific operation, and the rated output mode by the specific operation is changed to the output correction mode. It has a function of returning the output of the power supply circuit 28a to the corrected output corresponding to the cumulative lighting time in the output correction mode immediately before the rated output mode is entered at the time of recovery.

  Further, the control circuit 44 has a function of adjusting the output of the power supply circuit 28a in accordance with the dimming signal input from the dimming device 23 through the dimming light 24, and is input from the outside of the dimming device 23 or the like through the dimming light 24. It has a function of determining the presence or absence of a specific operation based on a specific signal. In other words, the specific operation of the present embodiment is that a specific signal transmitted through the light adjustment beam 24 is input to the control circuit 44.

  Subsequently, the power supply circuit 28b mounted on the other substrate 27b will be described.

  Only the main circuit 29b having the same configuration as the main circuit 29a mounted on the one substrate 27a is mounted on the other substrate 27b, and the common circuit 30 is not mounted.

  That is, the other substrate 27b includes a full-wave rectifier circuit 41, a power factor correction circuit 42, a DC converter 43, a control circuit 44, a voltage detection unit 45, a photodiode 50 of a photocoupler 49, a dimming signal output circuit 52, and the like. Only the main circuit 29b including it is mounted. The control circuit 44 also has the same function as the control circuit 44 mounted on one substrate 27a.

  Next, the operation of the power supply device 13 will be described.

  The commercial AC power supply 21 that is input to the power supply device 13 is input to each of the boards 27a and 27b. Thereby, in the power supply circuits 28a and 28b of the substrates 27a and 27b, respectively, the full-wave rectifier circuit 41 converts AC power into DC voltage, and the power factor improvement circuit 42 boosts the DC voltage to improve the power factor. The direct-current converter 43 steps down the direct-current voltage, adjusts it to a predetermined value, and outputs it to the light sources 12a and 12b. As a result, a load current flows through the LEDs 15 of the light sources 12a and 12b, and the LEDs 15 of the light sources 12a and 12b are turned on.

  On one substrate 27a, the dimming signal sent from the dimming device 23 is input to the dimming signal processing circuit 39, and the dimming signal output from the dimming signal processing circuit 39 is supplied to the photocoupler 49. The light is output from the dimming signal output circuit 52 to the control circuit 44 via the photodiode 50 and the phototransistor 51. The dimming signal output from the dimming signal processing circuit 39 is transmitted from the one substrate 27a to the other substrate 27b through the crossover wiring 31. On the other substrate 27b, the dimming signal output from the dimming signal processing circuit 39 on one substrate 27a is output from the dimming signal output circuit 52 to the control circuit 44 via the photodiode 50 and the phototransistor 51 of the photocoupler 49. Is done.

  In each of the boards 27a and 27b, the control circuit 44 inputs the output voltage detected by the voltage detection unit 45 and the dimming signal output from the dimming signal output circuit 52, and the power factor correction circuit 42 and the DC converter The operation of 43 is controlled, and the LEDs 15 of the light sources 12a and 12b are dimmed.

  Further, the output correction circuit 54 of the control circuit 44 corrects and controls the outputs of the power supply circuits 28a and 28b according to the cumulative lighting time of the light sources 12a and 12b in the output correction mode. This output correction mode has priority over the dimming signal. For example, when the output of the power supply circuits 28a and 28b is controlled to be 70% of the rated output, 100% from the dimming device 23 is used. Even if a dimming signal is input, the output of the power supply circuits 28a, 28b is set to 70% of the rated output, and if a dimming signal of 50% is input from the dimming device 23, the power supply The outputs of the circuits 28a and 28b are set to 35%, which is half of 70% of the rated output.

As shown in FIG. 3, the output correction circuit 54 of the control circuit 44 sets the output of the power supply circuits 28a and 28b to 70% of the rated output at the initial time t ₀ when the light sources 12a and 12b are turned on. As the cumulative lighting time of the light sources 12a and 12b elapses, the output of the power supply circuits 28a and 28b is gradually increased so as to approach the rated output, and the light sources 12a and 12b reach the predetermined end of life t _n . By setting the output of the power supply circuits 28a and 28b to 100% of the rated output, the brightness of the light sources 12a and 12b is always constant at any cumulative lighting time from the initial stage so that a constant illuminance is always maintained. Control.

  In addition, when the output of the power supply circuits 28a and 28b is rated output and when confirmation work or adjustment work is performed at the rated output, a specific signal is sent to the power supply device 13 from the outside of the light control device 23 or the like through the light control light 24. Perform specific operations to shift to feed and rated output mode.

In the initial time t ₀ when the cumulative lighting time is not started, or within the predetermined initial cumulative lighting time corresponding to the range of the initial time t ₀ even if the cumulative lighting time is started, the control circuit 44 When a specific signal sent from the outside of the light control device 23 or the like through the light beam 24 is input and it is determined that there is a specific operation, the output correction mode is switched to the rated output mode, and the outputs of the power supply circuits 28a and 28b are rated output. Of 100%. Confirmation work and adjustment work are performed at the rated outputs of the power supply circuits 28a and 28b. In this case, since the light sources 12a and 12b are connected to the power supply circuits 28a and 28b, all the light sources 12a and 12b are turned on, so that confirmation and adjustment operations can be performed.

  After confirming and adjusting at the rated outputs of the power supply circuits 28a and 28b, a specific operation is performed by sending a specific signal to the power supply 13 through the light beam 24 from the outside such as the dimmer 23, and the rated output mode is set. Perform a specific operation to cancel. Note that the specific signal may be a different specific signal so that it can be distinguished when shifting from the output correction mode to the rated output mode and when it is canceled, or as the same specific signal for each input of this specific signal. You may make it switch to transfer to a rated output mode and cancellation | release.

When the control circuit 44 in the rated output mode inputs a specific signal sent from the outside of the light control device 23 or the like through the light control light 24 and determines that there is a specific operation, the rated output mode is canceled and the output correction mode Return to. In this case, the rated output mode is within the predetermined initial cumulative lighting time corresponding to the range of the initial time t ₀ when the cumulative lighting time is not started, or within the initial time t ₀ even if the cumulative lighting time is started. Therefore, when returning from the rated output mode to the output correction mode, the outputs of the power supply circuits 28a and 28b are returned to the corrected output corresponding to the initial t ₀ of the cumulative lighting time, that is, 70% of the rated output. return.

Moreover, the cumulative lighting time is a time t ₁ has elapsed a predetermined time, the power supply circuit 28a, at time t ₁ the output of 80% of the rated output of the 28b, the control circuit 44, from the outside, such as light control device 23 When a specific signal sent through the light control light 24 is input and it is determined that a specific operation is present, the ratio of the output to the current rated output in the power supply circuits 28a and 28b is stored in the storage unit, and the output correction mode is changed to the rated output mode. And the output of the power supply circuits 28a and 28b is set to 100% of the rated output. Confirmation work and adjustment work are performed at the rated outputs of the power supply circuits 28a and 28b. In this case, since the light sources 12a and 12b are connected to the power supply circuits 28a and 28b, all the light sources 12a and 12b are turned on, so that confirmation and adjustment operations can be performed.

  After confirming and adjusting at the rated outputs of the power supply circuits 28a and 28b, a specific operation is performed by sending a specific signal to the power supply 13 through the light beam 24 from the outside such as the dimmer 23, and the rated output mode is set. Perform a specific operation to cancel. The specific signal is as described above.

When the control circuit 44 in the rated output mode inputs a specific signal sent from the outside of the light control device 23 or the like through the light control light 24 and determines that there is a specific operation, the rated output mode is canceled and the output correction mode Return to. In this case, since the cumulative lighting time has switched to the rated output mode at the time t ₁ when the predetermined time or more has elapsed, the output of the power supply circuits 28a and 28b is switched to the rated output mode when returning from the rated output mode to the output correction mode. The correction output corresponding to the cumulative lighting time t ₁ stored in the storage unit immediately before is returned to 80% of the rated output.

  According to the power supply device 13 configured as described above, since the power supply circuits 28a and 28b in the output correction mode are set to the rated output mode in which the rated output is performed by a specific operation, it is possible to easily perform the rated output from the power supply circuits 28a and 28b. It is possible to check and adjust at the rated output, and when returning from the rated output mode to the output correction mode by a specific operation, the output of the power supply circuits 28a and 28b is changed to a correction output according to the initial cumulative lighting time. Can be returned.

  Further, according to the power supply device 13, since the power supply circuits 28a and 28b in the output correction mode are set to the rated output mode for rated output by a specific operation when the cumulative lighting time has exceeded a predetermined time, the power supply circuit 28a can be easily used. , 28b can be rated output, confirmation work and adjustment work at the rated output can be performed, and when returning from the rated output mode to the output correction mode by a specific operation, the output of the power circuit 28a, 28b is set to the rated output mode It is possible to return to the corrected output corresponding to the cumulative lighting time in the output correction mode immediately before, and the brightness of the light sources 12a and 12b can be kept constant without resetting the cumulative lighting time.

  In addition, since the control circuit 44 determines the presence / absence of a specific operation based on a specific signal input through the light control 24, it is easy to switch between the output correction mode and the rated output mode without adding a special configuration. it can.

  For example, when a specific operation is performed with the light sources 12a and 12b removed from the power supply circuits 28a and 28b, the output correction mode is switched to the rated output mode, and the light sources 12a and 12b are returned to the power supply circuits 28a and 28b. By connecting, the rated output mode may be canceled to return to the output correction mode. Further, in the power supply device 13 having the protection circuit, the power supply circuits 28a and 28b are stopped by the protection circuit by removing the light sources 12a and 12b from the power supply circuits 28a and 28b. The circuits 28a and 28b output the rated power, and confirmation work and adjustment work can be performed.

  Further, the determination of the presence / absence of the specific operation by the control circuit 44 is not limited to the specific signal input through the light control 24, but may be ON / OFF of the commercial AC power supply 21 in a predetermined pattern, switch operation, or the like.

  Further, the power supply device 13 has a function of dimming control by an external dimming signal, but is not limited to this, as long as it has a function of correcting the output of the power supply circuits 28a and 28b, the external power supply 13 It is not necessary to have a function of performing dimming control by the dimming signal.

  Further, the illumination device 11 is not limited to the one using the LED 15 for the light sources 12a and 12b, but can be similarly applied to a lighting device using a lamp such as a fluorescent lamp or a discharge lamp.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

11 Lighting equipment
12a, 12b light source
13 Power supply
28a, 28b Power circuit
44 Control circuit
54 Output correction circuit

Claims (4)

A power supply circuit for turning on the light source;
An output correction circuit for correcting the output of the power supply circuit in accordance with the cumulative lighting time of the light source so as to make the light output of the light source constant;
A rated output mode in which the power circuit is rated at a specific operation, and a control circuit that returns the output of the power circuit to a corrected output corresponding to the initial cumulative lighting time when returning from the rated output mode by the specific operation;
A power supply device comprising: A power supply circuit for turning on the light source;
An output correction circuit for correcting the output of the power supply circuit in accordance with the cumulative lighting time of the light source so as to make the light output of the light source constant;
When the accumulated lighting time exceeds the specified time, the rated output mode is set so that the power supply circuit is rated output by a specific operation, and the cumulative lighting immediately before the output of the power circuit enters the rated output mode when the specified operation returns from the rated output mode. A control circuit for returning the correction output according to time;
A power supply device comprising: The control circuit has a function of adjusting the output of the power supply circuit according to a dimming signal input from outside through dimming light, and a function of determining a specific operation by a specific signal input from outside through dimming light The power supply device according to claim 1, wherein the power supply device is a power supply device. With a light source;
The power supply device according to any one of claims 1 to 3, wherein a light source is turned on;
An illumination device comprising:

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