JP2007273295A - Lighting device for discharge lamp, illumination fixture, and illumination system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable to reduce "error" and "bias of error" of measured accumulated lighting time of a discharge lamp between an area of a power supply frequency of 50 Hz and an area of that of 60 Hz. <P>SOLUTION: A signal converter circuit 263 detects zero cross timing which is a periodical feature point of an alternate current power supply voltage waveform of an alternate current power supply 130, and outputs detected signals to a comparator circuit 264. The comparator circuit 264 counts the detected signals and calculates the accumulated lighting time of the discharge lamp 111. A lighting time memory circuit 265 outputs light control ratio of the discharge lamp 111 according to the accumulated lighting time, a light control controlling circuit 266 outputs a frequency corresponding to the light control ratio, and an inverter control circuit 262 controls the inverter circuit by the frequency and light on the discharge lamp 111. At this time, the comparator circuit 264 calculates the accumulated lighting time of the discharge lamp 111 based on a specific frequency which is larger than 50 Hz and smaller than 60 Hz. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a discharge lamp lighting device, a lighting fixture, and a lighting system for controlling the lighting of a discharge lamp by measuring the cumulative lighting time of the discharge lamp, for example.

A discharge lamp lighting device that adjusts the brightness of the discharge lamp by counting the zero cross timing of the AC power supply voltage waveform of the commercial power supply supplied from the outside is considered.
JP 2005-209541 A

Since the periodic characteristic points of the AC power supply voltage waveform of the AC current are different between the power supply frequency 50 Hz and the power supply frequency 60 Hz, the number of alternations of the power supply frequency 50 Hz for a certain period of 3600 seconds is used as the cumulative lighting time, and this number of alternations is counted. In the discharge lamp lighting device that adjusts the brightness of the discharge lamp as the set value, the count value of the measuring instrument that counts the actual lighting time is determined by the value divided by the power supply frequency, and the power supply frequency is 50 Hz. The actual cumulative lighting time of the discharge lamp at 60 is 60 minutes (= 3600 [seconds] = 18000 [counts] / 50 [Hz]), and 50 minutes (= 3000 [seconds] = 18000 [counts] in the region where the power supply frequency is 60 Hz. ] / 60 [Hz]). That is, an error occurs for 10 minutes in the 60 Hz region. Expressing this as a percentage, the error in the cumulative lighting time is “0%” in the 50 Hz region and “16.7%” in the 60 Hz region. That is, the difference between the error in the region where the power supply frequency is 50 Hz and the error in the region where the power source frequency is 60 Hz is “16.7%”.
Therefore, in the conventional method, the “error” and “error bias” of the cumulative lighting time increase between the region where the power supply frequency is 50 Hz and the region where 60 Hz.

  An object of the present invention is to reduce the “error” and “error bias” of the cumulative lighting time of a discharge lamp measured between, for example, an area where the power supply frequency is 50 Hz and an area of 60 Hz. .

The discharge lamp lighting device of the present invention detects a periodic characteristic point of the AC power supply voltage waveform of the input AC power supply, and counts the number according to the detection and the frequency of the input AC power supply. Of these, when the lowest frequency is the minimum frequency f _min and the highest frequency is the maximum frequency f _max , cumulative lighting is performed based on a set value that sets a specific frequency f _mid that is larger than the minimum frequency f _{min and} smaller than the maximum frequency f _max. It is characterized by comprising a timekeeping section for measuring time.

  According to the present invention, for example, by measuring the cumulative lighting time of a discharge lamp on the basis of a frequency greater than 50 Hz and smaller than 60 Hz, the cumulative discharge lamp measured between a region where the power supply frequency is 50 Hz and a region where the power source frequency is 60 Hz. It is possible to reduce the “error” and “error bias” of the lighting time.

Embodiment 1 FIG.
A mode in which the specific frequency used for calculating the cumulative lighting time of the discharge lamp is “55 Hz”, which is an intermediate frequency between 50 Hz and 60 Hz, will be described below.

FIG. 1 is a configuration diagram of a lighting system 100 according to the first embodiment.
The lighting system 100 is, for example, a system used in a building room 120, and includes a plurality of lighting fixtures 110 installed in the building room 120, an AC power source 130 that supplies power to each lighting fixture 110, and an AC power source 130. And a switch 140 for turning on / off the supply of electric power to the lighting fixture 110.

The AC voltage of the power supplied from the AC power supply 130 to each lighting fixture 110 is referred to as “power supply voltage”.
Further, the frequency of the power supply voltage is “power supply frequency (AC power supply frequency)”, and the cycle of the power supply voltage is “power supply cycle”.
The waveform formed by the power supply voltage is referred to as “AC power supply voltage waveform”, and the wave formed by the power supply voltage in the power supply cycle is referred to as “AC wave”.
Further, it is a periodic characteristic point of the AC power supply voltage waveform, and the time when the AC power supply voltage waveform indicates 0 V (volt) is referred to as “zero cross timing”.
That is, “the number of zero cross timings per power cycle” is two times when the phase of the AC power source voltage waveform is 180 ° and 360 °.
Two zero cross timings correspond to one AC wave.

FIG. 2 is a configuration diagram of the lighting fixture 110 according to the first embodiment.
The lighting fixture 110 has a discharge lamp 111 attached to a connector 113, and has a discharge lamp lighting device 200 described below in the fixture body 112, and controls the lighting of the discharge lamp 111.

  The illumination system 100 according to Embodiment 1 is particularly characterized in that it includes a discharge lamp lighting device 200.

FIG. 3 is a configuration diagram of the discharge lamp lighting device 200 according to the first embodiment.
The discharge lamp lighting device 200 according to the first embodiment includes a rectifier circuit 210, an AC power supply monitor 220, a step-up chopper circuit 230, an inverter circuit 240, a resonance circuit 250, and an inverter control IC 260, and controls lighting of the discharge lamp 111.

The rectifier circuit 210 is a circuit that inputs a power supply voltage from the AC power supply 130 and rectifies the AC power supply voltage of the input power supply voltage.
The AC power supply monitor 220 is a circuit that divides the power supply voltage rectified by the rectifier circuit 210 (hereinafter referred to as rectified voltage) by the resistors R1 and R2, and outputs the rectified voltage divided by the resistance to the inverter control IC 260. is there.
The step-up chopper circuit 230 turns on / off the switching element Q1 by the inverter control IC 260. A current is supplied to the harmonic choke L1 during the ON period of the switching element Q1, and the energy stored in the harmonic choke L1 is charged to the smoothing capacitor C5 via the diode D1 during the OFF period. ).
The inverter circuit 240 is a circuit that turns on and off the switching elements Q2 and Q3 by the inverter control IC 260 and converts the boosted voltage into a high-frequency voltage.
The resonant circuit 250 supplies a high-frequency current to a series circuit including a boosted voltage source, a ballast choke L2, a coupling capacitor C1, filaments F1 and F2, and a starting capacitor C2. At this time, there is a relationship of the capacity of the coupling capacitor C1 >> the capacity of the starting capacitor C2. A high frequency high voltage is generated in the starting capacitor C2 due to the LC series resonance of the ballast choke L2 and the starting capacitor C2. 111 is applied to the discharge lamp 111. This is a circuit for adjusting the brightness of the discharge lamp 111 by controlling the amount of energy supplied to the discharge lamp 111 according to the relationship with the resonance frequency by the ballast choke L2 and the starting capacitor C2 after lighting.

The inverter control IC 260 receives the rectified voltage divided by the AC power supply monitor 220, counts the zero cross timing of the AC power supply voltage waveform, and calculates the inverter circuit 240 at a frequency based on the cumulative lighting time of the discharge lamp 111 calculated from the counted value. The switching element Q2 and the switching element Q3 are switching-controlled. The inverter control IC 260 controls the lighting of the discharge lamp 111 by switching the switching element Q1 of the step-up chopper circuit 230 and the switching elements Q2 and Q3 of the inverter circuit 240.
The inverter control IC 260 includes an initial illuminance correction circuit 261 and an inverter control circuit 262. The initial illuminance correction circuit 261 includes a signal conversion circuit 263, a comparator circuit 264, a lighting time storage circuit 265, and a dimming control circuit 266.
The initial illuminance correction circuit 261 receives the rectified voltage divided by the AC power supply monitor 220, counts the zero cross timing of the AC power supply voltage waveform, and indicates the frequency based on the cumulative lighting time of the discharge lamp 111 calculated from the counted value. This is a circuit that outputs a control signal to the inverter control circuit 262.
The inverter control circuit 262 performs switching control of the switching element Q2 and the switching element Q3 of the inverter circuit 240 based on the frequency indicated by the control signal output from the initial illuminance correction circuit 261, and controls the switching element Q1 to discharge the lamp. 111 is a circuit for controlling lighting of the light source 111.
When the discharge lamp 111 is lit at the same dimming rate, the amount of light flux of the discharge lamp 111 is attenuated with the lapse of the cumulative lighting time, and the lighting illuminance is lowered. Therefore, the inverter control IC 260 adjusts the switching frequency of the switching elements Q2 and Q3 so as to increase the dimming rate of the discharge lamp 111 as the cumulative lighting time of the discharge lamp 111 elapses.
The signal conversion circuit 263 receives the AC voltage resistance-divided by the AC power supply monitor 220, detects the zero cross timing of the AC power supply voltage waveform, and outputs a detection signal to the comparator circuit 264 when the zero cross timing is detected.
The comparator circuit 264 (measurement unit, counting unit) counts the detection signal output from the signal conversion circuit 263, and outputs a time signal to the lighting time storage circuit 265 when the detection signal is counted a predetermined number of times. That is, the comparator circuit 264 counts the zero cross timing of the AC power supply voltage waveform and outputs it to the lighting time storage circuit 265 as a time signal.
The lighting time storage circuit 265 (the dimming rate storage unit) counts the time signal output from the comparator circuit 264, and calculates the cumulative lighting time of the discharge lamp 111 based on the counted time signal. For example, when one time signal corresponds to 30 minutes, the lighting time storage circuit 265 adds 30 minutes to the cumulative lighting time each time a time signal is input from the comparator circuit 264 and stores the cumulative lighting time in the storage element. To do. The lighting time storage circuit 265 stores a dimming rate corresponding to the cumulative lighting time in the storage element, and outputs a dimming signal indicating the dimming rate corresponding to the calculated cumulative lighting time to the dimming control circuit 266. To do.
A dimming control circuit 266 (a dimming signal generation unit) stores a frequency corresponding to the dimming rate in a storage element, and inverters the control signal indicating the frequency corresponding to the dimming signal output from the lighting time storage circuit 265. Output to the control circuit 262.

  The cumulative lighting time of the discharge lamp 111 calculated by the lighting time memory circuit 265 when the comparator circuit 264 outputs a time signal once can be expressed by the following formula 1.

  Accumulated lighting time of the discharge lamp 111 = counter set value / (specific frequency × count value of periodic characteristic points of the AC power supply voltage waveform of the AC power supply) [Equation 1]

  Now, the “count value of the periodic feature point of the AC power supply voltage waveform of the AC power supply” is set to “2” (one cycle count value), the “counter set value” in the comparator circuit 264 is set to “180000”, When “specific frequency” is “50”, the cumulative lighting time of the discharge lamp 111 per time signal is “30 minutes (= 1800 seconds = 18000 / (50 × 2))”.

The discharge lamp lighting device 200 according to the first embodiment is particularly characterized in that it includes the initial illuminance correction circuit 261 described above.
Details of the signal conversion circuit 263 and the comparator circuit 264 included in the initial illuminance correction circuit 261 will be described below.

FIG. 4 is a circuit diagram illustrating a configuration of the signal conversion circuit 263 according to the first embodiment.
FIG. 5 is a diagram illustrating input / output of the signal conversion circuit 263 according to the first embodiment.
The signal conversion circuit 263 in Embodiment 1 will be described below with reference to FIGS.

The signal conversion circuit 263 can be configured by a comparator as shown in FIG.
The signal conversion circuit 263 receives the voltage Va obtained by resistance-dividing the rectified voltage V1 by the AC power supply monitor 220. The signal conversion circuit 263 outputs the detection signal Vout when the voltage Va input from the AC power supply monitor 220 becomes equal to or lower than the predetermined voltage Vdc. The detection signal Vout to be output is a pulse-like high level signal (a signal having a positive voltage during detection of the zero cross timing). The voltage Vdc is a reference voltage for determining zero crossing, and the detection signal Vout indicates zero cross timing. The voltage Vdc is set so that the detection signal Vout has an appropriate time width.
The relationship among the rectified voltage V1, the voltage Va, the voltage Vdc, and the detection signal Vout is as shown in FIG.
While the voltage Va obtained by resistance-dividing the rectified voltage V1 as shown in FIG. 5 (1) by the AC power supply monitor 220 is equal to or lower than the voltage Vdc shown in FIG. 5 (2), the signal conversion circuit 263 is shown in FIG. 5 (3). Thus, the detection signal Vout is output.
In FIG. 5, the interval between two peaks of the rectified voltage V1 shown in (1) corresponds to one cycle of the power supply voltage waveform. That is, when the rectifier circuit 210 performs full-wave rectification, the number of times that the signal conversion circuit 263 detects the zero cross timing during the power cycle is two, and two zero cross timings correspond to one power supply voltage waveform.

FIG. 6 is a circuit diagram showing a configuration of comparator circuit 264 in the first embodiment.
The comparator circuit 264 in Embodiment 1 will be described below with reference to FIG.
The comparator circuit 264 in Embodiment 1 outputs the time signal Vt to the lighting time storage circuit 265 when the detection signal output from the signal conversion circuit 263 is counted 18,000 times. At this time, when the specific frequency is 55 Hz, one time signal Vt corresponds to a cumulative lighting time of 30 minutes.

The comparator circuit 264 includes a gate circuit 310 and an 18-bit counter 320 as shown in FIG.
The gate circuit 310 is a logic circuit that can be composed of a logical product (AND) circuit and a negation (NOT) circuit.
The 18-bit counter 320 is a counter circuit that can be composed of four 4-bit counters and one 2-bit counter.
The 18-bit counter 320 receives and counts the detection signal Vout output from the signal conversion circuit 263 at the zero cross timing. The 18-bit counter 320 represents the counted value as a binary number of “0 (off)” and “1 (on)”, and the bit indicating “1” outputs a count signal to the gate circuit 310. Further, the 4-bit counter 321 counts the detection signal Vout from the signal conversion circuit 263, and counts the upper digit when a new detection signal Vout is input in a state where all four bits are “1”. A carry signal is output to the bit counter 322, and all four bits are reset to "0". Similarly, the 4-bit counter 322 to the 4-bit counter 324 also count the carry signal from the counter that counts the lower digits and input a new carry signal in a state where all four bits are “1”. In this case, a carry signal is output to the counter that counts the upper digits, and all four bits are reset to “0”. In FIG. 6, the least significant bit (LSB: Least Significant Bit) indicating the least significant digit of the 18-bit counter 320 is the leftmost bit (the leftmost bit of the 4-bit counter 321). The most significant bit (MSB: Most Significant Bit) is the rightmost bit (the right bit of the 2-bit counter 325).
The gate circuit 310 detects the count signal output by each bit of the 18-bit counter 320, and outputs the time signal Vt to the lighting time storage circuit 265 when the detected count signal meets the condition formed by the AND circuit and the NOT circuit. Output.
The lighting time storage circuit 265 outputs a reset signal Vr to each counter of the 18-bit counter 320 when the time signal Vt is input from the gate circuit 310, and each counter of the 18-bit counter 320 receives the reset signal Vr. Reset all bits to "0".

In FIG. 6, the gate circuit 310 outputs the time signal Vt to the lighting time storage circuit 265 when the count signal output by each bit of the 18-bit counter 320 indicates “110000010101110000”.
That is, the comparator circuit 264 outputs the time signal Vt when the detection signal Vout output from the signal conversion circuit 263 counts 198000 (= [1100000101011110000] ₂ ).
Here, in the above formula 1, when the “specific frequency” is “55 Hz” and the “count value of the periodic feature point of the AC power supply voltage waveform of the AC power supply” is “2”, the gate circuit 310 generates the time signal Vt. Can be determined as “30 minutes (= 1800 seconds = 198000 / (55 × 2))”.

FIG. 7 is a table showing the cumulative lighting time of the discharge lamp 111 in an area where the power supply frequency is 50 Hz and an area where the power supply frequency is 60 Hz.
“Frequency” indicates a specific frequency used for calculating the cumulative lighting time of the discharge lamp 111.
“Period” indicates a period of a specific frequency.
The “counter set value” is a count number of zero cross timing corresponding to the cumulative lighting time of the discharge lamp 111 when the power supply frequency is the specific frequency indicated by “frequency”. For example, the comparator circuit 264 outputs a time signal to the lighting time storage circuit 265 when the detection signal from the signal conversion circuit 263 is counted as many times as indicated by “decimal system” of the “counter setting value”. At this time, the lighting time storage circuit 265 calculates the cumulative lighting time of the discharge lamp 111 by adding 30 minutes each time a time signal is input. Further, the gate circuit 310 of the comparator circuit 264 is a lighting time storage circuit when the count signal output by each bit of the 18-bit counter 320 indicates the bit state indicated by “binary system” of the “set value of the counter”. A logic circuit for outputting a time signal to H.265 is provided.
Here, the time corresponding to the “set value of the counter” is defined as “measurement time”. The measurement time in FIG. 7 is “30 minutes”.

  “Frequency” in FIG. 7 corresponds to “specific frequency” in Equation 1, and “Frequency” and “Set value of counter” in FIG.

  Measurement time = counter set value / (frequency × count value of periodic characteristic points of AC power supply voltage waveform of AC power supply) [Equation 2]

  In FIG. 7, “actual time” in the “50 Hz region” is a true value of the cumulative lighting time of the discharge lamp 111 in the region where the power supply frequency is 50 Hz, and is a time calculated by the following Equation 3.

  Actual time (50 Hz region) = setting value of counter / (50 × number of zero cross timings per power cycle) [Equation 3]

  “Error” in “50 Hz region” is a value indicating an error of “actual time” (formula 3) with respect to “measurement time” (formula 2) as a percentage.

  In FIG. 7, “actual time” of “60 Hz region” is a true value of the cumulative lighting time of the discharge lamp 111 in a region where the power supply frequency is 60 Hz, and is a time calculated by the following equation 4.

  Actual time (60 Hz region) = set value of counter / (60 × number of zero cross timings per power cycle) [Equation 4]

  “Error” in “60 Hz region” is a value indicating the error of “actual time” (formula 4) as a percentage with respect to “measurement time” (formula 2).

  “Specification 1” whose “frequency” is “50 Hz” has an “error” of “0” in the “50 Hz region”, but a large “error” of “16.7%” occurs in the “60 Hz region”. Is shown. “Specification 1” indicates that there is a large gap of “16.7 (= 16.7-0)%” between “error” in “50 Hz region” and “error” in “60 Hz region”. Show.

  “Specification 2” with “Frequency” of “60 Hz” has “Error” of “0” in “60 Hz region”, but “Error” is as large as “20.0% (absolute value)” in “50 Hz region”. "Is generated. “Specification 2” indicates that there is a large gap of “20.0 (= 20.0-0)%” between “error” of “50 Hz region” and “error” of “60 Hz region”. Show.

In “Specification 3” with “Frequency” of “55 Hz”, “Error” of “10% (absolute value)” occurs in “50 Hz region”, and “Error” of “8.3%” occurs in “60 Hz region”. It shows what happens.
“Error” (10.0%) of “Specification 3” is smaller than “Error” (16.7%) of “Specification 1” and “Error” (20.0%) of “Specification 2”.

In addition, in “Specification 3”, there is a difference of “1.7 (= 10−8.3)%” in absolute value between “error” of “50 Hz region” and “error” of “60 Hz region”. Is shown.
The “error” distance (1.7%) between the “specification 3” “50 Hz region” and the “60 Hz region” is “specification 1” “error” separation (16.7%) and the “specification 2”. This is smaller than the “error” gap (20.0%).

  As shown in “Specification 1” and “Specification 2” in FIG. 7, when the cumulative lighting time of the discharge lamp 111 is calculated using “50 Hz” or “60 Hz” as a specific frequency, “50 Hz region” and “60 Hz region” In either case, a large “error” occurs, and a large gap occurs between the “error” in the “50 Hz region” and the “error” in the “60 Hz region”.

  However, in the first embodiment, “55 Hz”, which is an intermediate frequency between “50 Hz” and “60 Hz”, is set as the specific frequency. Therefore, as shown in “Specification 3” in FIG. 7, “50 Hz region” and “60 Hz region” "" Does not cause a large "error", and there is no large gap between "error" in the "50 Hz region" and "error" in the "60 Hz region".

  That is, the initial illuminance correction circuit 261 according to the first embodiment can calculate the cumulative lighting time of the discharge lamp 111 without reducing the accuracy regardless of whether the power supply frequency is 50 Hz or 60 Hz. . Further, since the cumulative lighting time of the discharge lamp 111 can be calculated without reducing accuracy, the inverter control IC 260 in the first embodiment can light the discharge lamp 111 with a constant illuminance as the cumulative lighting time elapses. .

  In the first embodiment, the discharge lamp lighting device 200 that includes the AC power supply monitor 220 that monitors the AC power supply 130 and supplies the discharge lamp 111 with power obtained from the AC power supply has been described. The discharge lamp lighting device 200 counts periodic feature points of the AC power supply voltage waveform of the AC power supply monitored by the AC power supply monitor 220 by the initial illuminance correction circuit 261, and uses a value between 50 Hz and 60 Hz as the power supply frequency. The cumulative lighting time is calculated. Further, the discharge lamp lighting device 200 is characterized in that the cumulative lighting time is calculated using the center frequency 55 Hz of 50 Hz and 60 Hz as the specific frequency.

In the first embodiment, an inverter control IC 260 including an inverter control circuit 262, a signal conversion circuit 263, a comparator circuit 264, a lighting time storage circuit 265, and a dimming control circuit 266 for controlling the lighting of the discharge lamp 111 will be described. did. In particular, the inverter control IC 260 in which the comparator circuit 264 includes the gate circuit 310 and the 18-bit counter 320 for calculating the cumulative lighting time of the discharge lamp 111 has been described.
Although a microcomputer may be used as the inverter control IC 260, since the microcomputer is designed so that it can execute a function unnecessary for the lighting control of the discharge lamp 111, the gate circuit 310 and the 18-bit counter 320 are also designed. It is expensive, large and heavy compared to Therefore, by adopting the configuration shown in the first embodiment, the circuit of the inverter control IC 260 can be simplified and space saving of the inverter control IC 260 can be achieved. That is, the configuration of the first embodiment makes the inverter control IC 260 inexpensive, small, and lightweight.

In the first embodiment, “55 Hz” is used as the specific frequency used to calculate the cumulative lighting time of the discharge lamp 111, but a frequency other than 55 Hz that is greater than 50 Hz and less than 60 Hz may be used.
In the first embodiment, two power sources, 50 Hz and 60 Hz, have been described as power source frequencies. However, the power source frequency may be other frequencies, or three or more different power source frequencies may be targeted. In this case, the initial illuminance correction circuit 261 may set the frequency f _mid greater than the minimum power supply frequency f _{min and} smaller than the maximum power supply frequency f _max as the specific frequency. In particular, the initial illuminance correction circuit 261 may set the frequency f _mid between the minimum power supply frequency f _min and the maximum power supply frequency f _max as a specific frequency.

  In the first embodiment, the measurement time is “30 minutes”, but the measurement time may not be “30 minutes”. When the measurement time is not “30 minutes”, the 18-bit counter 320 of the comparator circuit 264 is a counter circuit having the number of bits b calculated by the following equation 5 with respect to the measurement time T. In Expression 5, “ROUNDUP (X)” means rounding up X after the decimal point. In Expression 5, “the number n of zero cross timings per power cycle” is, for example, “1” as in the first embodiment, and, for example, as in the fifth embodiment and the sixth embodiment described later. “2”.

Number of bits b = ROUNDUP (log ₂ (measurement time T × maximum frequency f _max × number of zero cross timings per power cycle n)) [Equation 5]

Embodiment 2. FIG.
In the second embodiment, further description will be given of increasing the accuracy of the cumulative lighting time of the discharge lamp 111 and making the inverter control IC 260 cheaper, smaller and lighter than in the first embodiment.
Hereinafter, matters different from those of the first embodiment will be described, and the other matters shall be the same as those of the respective embodiments.

FIG. 8 is a circuit diagram showing a configuration of comparator circuit 264 in the second embodiment.
In FIG. 8, the comparator circuit 264 includes a gate circuit 310 and an 18-bit counter 320, and the gate circuit 311 is a circuit that the comparator circuit 264 does not have.
The comparator circuit 264 in the second embodiment is different from the comparator circuit 264 (see FIG. 6) in the first embodiment in that the gate circuit 311 is not provided.

That is, the gate circuit 310 according to the second embodiment is characterized in that the elapsed measurement time (30 minutes) is determined by a plurality of bits continuous from the most significant bit to the lower bit side.
Further, the gate circuit 310 according to the second embodiment is characterized in that the elapse of the measurement time (30 minutes) is determined using the most significant bit.

“Specification 4” in FIG. 7 shows the “error” of “50 Hz region” and the “error” of “60 Hz region” in the second embodiment.
“Specification 4” indicates that an “error” of “9.2% (absolute value)” occurs in the “50 Hz region” and an “error” of “9.0%” occurs in the “60 Hz region”.
The “error” (9.2%) of “specification 4” is smaller than the “error” (10.7%) of “specification 3”.

In addition, “specification 4” has a difference of “0.2 (= 9.2-9.0)%” in absolute value between “error” of “50 Hz region” and “error” of “60 Hz region”. It shows what happens.
The “error” gap (0.2%) between the “specification 4” “50 Hz region” and “60 Hz region” is smaller than the “specification 3” “error” separation (1.7%). .

  In the second embodiment, when the initial illuminance correction circuit 261 is configured, the upper 2 bits of the 18-bit counter 320 are used as the determination condition, and the discharge lamp is characterized in that the MSB is used as the determination condition. The lighting device 200 has been described.

  In the second embodiment, the accuracy of the cumulative lighting time of the discharge lamp 111 is further improved than in the first embodiment by deleting the gate circuit 311 for the plurality of lower bits from the comparator circuit 264 in the first embodiment. It has been described that the inverter control IC 260 is made cheaper, smaller and lighter.

As shown in FIG. 9, the comparator circuit 264 according to the second embodiment uses only the most significant bit to determine whether the measurement time (30 minutes) has elapsed, thereby further reducing the cost of the inverter control IC 260, making it smaller and lighter. May be used.
Further, the comparator circuit 264 in the second embodiment may determine the elapse of the measurement time (30 minutes) using not the upper 2 bits but the upper 3 bits or more.

Embodiment 3 FIG.
In the third embodiment, an embodiment will be described in which the error in the cumulative lighting time of the discharge lamp 111 is made the same in the region where the power supply frequency is 50 Hz and in the region where 60 Hz, and the difference in error is eliminated.
Hereinafter, matters different from those of the first embodiment will be described, and the other matters shall be the same as those of the respective embodiments.

FIG. 10 is a circuit diagram showing a configuration of comparator circuit 264 in the third embodiment.
In the third embodiment, the gate circuit 310 included in the comparator circuit 264 outputs the time signal Vt to the lighting time storage circuit 265 when each bit of the 18-bit counter 320 indicates “101111111100001100”.

That is, the comparator circuit 264 in the third embodiment determines that the accumulated lighting time of the discharge lamp 111 has passed the measurement time (30 minutes) when the zero cross timing is counted 196364 times, and the time signal Vt is sent to the lighting time memory circuit 265. It is characterized by outputting.
Further, the initial illuminance correction circuit 261 according to the third embodiment is characterized in that the specific frequency used for calculating the cumulative lighting time of the discharge lamp 111 is “54.5 Hz”.

The reference frequency “54.5 Hz” is calculated by, for example, the following expressions 6.1 to 6.11.
In Equation 6.1 to Equation 6.11, “specific frequency” is “A”, “measurement time” is “B”, “counter set value” (see FIG. 7) is “C”, and “50 Hz region”. “D” for “actual time” (see FIG. 7), “error” (see FIG. 7) for “50 Hz region”, and “actual time” (see FIG. 7) for “60 Hz region” “ The “error” of F ”and“ 60 Hz region ”(see FIG. 7) is“ G ”. In addition, the following formulas 6.1 to 6.5 are related to each variable generated by setting “measurement time (B)” to “60 minutes (3600 seconds)” and “zero cross timing per power cycle” to “1”. It is a formula.

C = A × B [Formula 6.1]
D = (C / 50) × (1/60) (Equation 6.2)
F = (C / 60) × (1/60) (Formula 6.3)
E = (D / 60) × 100-100 (Equation 6.4)
G = 100− (F / 60) × 100 (Equation 6.5)

  Here, in order to make the “error” of the “50 Hz region” and the “60 Hz region” the same, “A” where “E = G” is obtained.

(D / 60) × 100−100 = 100− (F / 60) × 100 (Equation 6.6)
120 = D + F [Formula 6.7]

  Substituting Equation 6.2 and Equation 6.3 into Equation 6.7 yields Equation 6.8 and Equation 6.9 below.

120 = (C / 3000) + (C / 3600) [Formula 6.8]
C = 21600000/11 [Formula 6.9]

  Substituting Equation 6.1 into Equation 6.9 yields Equation 6.10 below.

  A = 21210000 / (11 × B) [Formula 6.10]

  Here, when “3600 seconds” is substituted into “B” to obtain “A”, the specific frequency becomes about 54.5 Hz as shown in the following Expression 6.11.

  A = 216000 / (11 × 3600) = 54.5454 ... [Formula 6.11]

The “error” of “50 Hz region” and the “error” of “60 Hz region” in the third embodiment are shown in “specification 5” of FIG.
“Specification 5” indicates that an “error” of “9.1% (absolute value)” occurs in the “50 Hz region” and an “error” of “9.1%” also occurs in the “60 Hz region”. .
That is, in the third embodiment, by setting the specific frequency used for calculating the cumulative lighting time of the discharge lamp 111 to “54.5 Hz”, the cumulative lighting of the discharge lamp 111 in the region where the power supply frequency is 50 Hz and the region where 60 Hz is used. The time error can be made the same, and the error gap can be eliminated.

  In Embodiment 3, the discharge lamp lighting device 200 is characterized in that the cumulative lighting time is calculated using a value of a specific frequency at which the error in the cumulative lighting time is the same between 50 Hz and 60 Hz as the power supply frequency. explained.

In the third embodiment, two power frequencies, 50 Hz and 60 Hz, have been described as power supply frequencies. However, the power supply frequency may be other frequencies or may be three or more different power supply frequencies. In this case, the initial illuminance correction circuit 261 may use the specific frequency f _mid calculated by Expression 7 below using the minimum power supply frequency f _min and the maximum power supply frequency f _max .

Specific frequency _fmid = 2 ( _fmin * _fmax ) / ( _fmin + _fmax ) ... [Formula 7]

Embodiment 4 FIG.
In the fourth embodiment, it will be described that the initial illuminance correction circuit 261 calculates the periodic feature points of the AC power supply voltage waveform other than the zero cross timing and calculates the cumulative lighting time of the discharge lamp of the discharge lamp 111.
Hereinafter, matters different from those of the first embodiment will be described, and the other matters shall be the same as those of the respective embodiments.

FIG. 11 is a circuit diagram showing a configuration of the signal conversion circuit 263 in the fourth embodiment.
FIG. 12 is a diagram illustrating input / output of the signal conversion circuit 263 according to the fourth embodiment.
The signal conversion circuit 263 according to Embodiment 4 will be described below with reference to FIGS.

The signal conversion circuit 263 can be configured by a comparator as shown in FIG.
The signal conversion circuit 263 receives the voltage Va obtained by resistance-dividing the rectified voltage V1 by the AC power supply monitor 220. The signal conversion circuit 263 outputs the detection signal Vout when the voltage Va input from the AC power supply monitor 220 becomes equal to or higher than the predetermined voltage Vdc.
The relationship among the rectified voltage V1, the voltage Va, the voltage Vdc, and the detection signal Vout is as shown in FIG.
While the voltage Va obtained by resistance-dividing the rectified voltage V1 as shown in FIG. 12 (1) by the AC power supply monitor 220 is equal to or higher than the voltage Vdc shown in FIG. 12 (2), the signal conversion circuit 263 is shown in FIG. 12 (3). Thus, the detection signal Vout is output.

  The peak time (maximum voltage value [+] or minimum voltage value [−]) indicated by the AC power supply voltage waveform is defined as “peak timing”. In this case, “zero cross timing” in each embodiment can be read as “peak timing”.

  In the fourth embodiment, the same effects as those in the respective embodiments can be obtained.

Embodiment 5 FIG.
In the fifth embodiment, a mode in which the rectifier circuit 210 performs half-wave rectification will be described.
Hereinafter, matters different from those of the first embodiment will be described, and the other matters shall be the same as those of the respective embodiments.

FIG. 13 is a configuration diagram of the discharge lamp lighting device 200 according to the fifth embodiment.
The rectifier circuit 210 according to the fifth embodiment is, for example, a diode D2, and outputs only the positive part of the AC power supply voltage waveform to rectify the power supply voltage by half wave.

FIG. 14 is a diagram illustrating input / output of the signal conversion circuit 263 according to the fifth embodiment.
In FIG. 14, the interval between one peak of the rectified voltage V1 shown in (1) corresponds to one cycle of the power supply voltage (one AC wave). That is, when the rectifier circuit 210 performs half-wave rectification, the number of times that the signal conversion circuit 263 detects the zero cross timing during the power cycle is one, and one zero cross timing corresponds to one AC wave.

  When the number of zero cross timings per power cycle becomes “one” by the half-wave rectification by the rectifier circuit 210, the “counter set value” shown in FIG. 7 corresponds to the measurement time “60 minutes”. The “actual time” between the “50 Hz region” and the “60 Hz region” is doubled. For example, in “Specification 1”, “actual time” of “50 Hz region” is “60 minutes”, and “actual time” of “60 Hz region” is “50 minutes”.

  In the fifth embodiment, the same effects as those of the respective embodiments can be obtained.

Embodiment 6 FIG.
In the sixth embodiment, a description will be given of a mode in which the AC power supply monitor 220 divides the power supply voltage of the AC power supply 130 instead of the rectified voltage.
Hereinafter, matters different from those of the first embodiment will be described, and the other matters shall be the same as those of the respective embodiments.

FIG. 15 is a configuration diagram of a discharge lamp lighting device 200 according to the sixth embodiment.
The AC power supply monitor 220 is a circuit that receives a power supply voltage from the AC power supply 130, divides the input power supply voltage by the resistors R1 and R2, and outputs the rectified voltage obtained by the resistance division to the inverter control IC 260.

FIG. 16 is a diagram illustrating input / output of the signal conversion circuit 263 according to the sixth embodiment.
In FIG. 16, two peaks (upward peak and downward peak) of the rectified voltage V1 shown in (1) correspond to one cycle of the power supply voltage (one AC wave). That is, when the AC power supply monitor 220 resistance-divides the power supply voltage and outputs it to the signal conversion circuit 263, the number of times that the signal conversion circuit 263 detects the zero cross timing during the power supply cycle is one, and the zero cross timing is one time. It corresponds to one AC wave.

  When the AC power supply monitor 220 divides the power supply voltage by resistance and outputs it to the signal conversion circuit 263, the number of zero cross timings per power supply cycle becomes “1”, the “counter set value” shown in FIG. This corresponds to the measurement time “60 minutes”, and the “actual time” between the “50 Hz region” and the “60 Hz region” is doubled. For example, in “Specification 1”, “actual time” of “50 Hz region” is “60 minutes”, and “actual time” of “60 Hz region” is “50 minutes”.

  In the sixth embodiment, the same effects as those in the respective embodiments can be obtained.

1 is a configuration diagram of a lighting system 100 according to Embodiment 1. FIG. FIG. 3 is a configuration diagram of a lighting fixture 110 in the first embodiment. 1 is a configuration diagram of a discharge lamp lighting device 200 in Embodiment 1. FIG. FIG. 3 is a circuit diagram illustrating a configuration of a signal conversion circuit 263 in Embodiment 1; FIG. 5 shows input / output of the signal conversion circuit 263 in Embodiment 1; 3 is a circuit diagram illustrating a configuration of a comparator circuit 264 in Embodiment 1. FIG. The table | surface which shows the cumulative lighting time of the discharge lamp 111 in the area whose power supply frequency is 50 Hz, and the area of 60 Hz. FIG. 6 is a circuit diagram illustrating a configuration of a comparator circuit 264 in Embodiment 2. FIG. 6 is a circuit diagram illustrating a configuration of a comparator circuit 264 in Embodiment 2. FIG. 6 is a circuit diagram illustrating a configuration of a comparator circuit 264 according to Embodiment 3. FIG. 10 is a circuit diagram illustrating a configuration of a signal conversion circuit 263 in Embodiment 4; FIG. 10 shows inputs and outputs of a signal conversion circuit 263 in Embodiment 4. The block diagram of the discharge lamp lighting device 200 in Embodiment 5. FIG. FIG. 10 shows input / output of a signal conversion circuit 263 in Embodiment 5. The block diagram of the discharge lamp lighting device 200 in Embodiment 6. FIG. FIG. 10 shows input / output of a signal conversion circuit 263 in Embodiment 6.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 Lighting system, 110 Lighting fixture, 111 Discharge lamp, 112 Appliance main body, 113 connector, 120 Building room, 130 AC power supply, 140 switch, 200 Discharge lamp lighting device, 210 Rectifier circuit, 220 AC power supply monitor, 230 Boost chopper circuit , 240 inverter circuit, 250 resonance circuit, 260 inverter control IC, 261 initial illuminance correction circuit, 262 inverter control circuit, 263 signal conversion circuit, 264 comparator circuit, 265 lighting time storage circuit, 266 dimming control circuit, 310, 311 gate Circuit, 320 18-bit counter, 321, 322, 323, 324 4-bit counter, 325 2-bit counter, DB diode bridge, R1, R2 resistor, L1 harmonic choke, L2 ballast choke, D 1, D2 diode, Q1, Q2, Q3 switching element, C1, C2 capacitor, C5 smoothing capacitor, F1, F2 filament.

Claims (12)

A periodic characteristic point of the AC power supply voltage waveform of the input AC power supply is detected, and a count value that is counted according to this detection,
Among the frequencies of the input AC power supply, when the lowest frequency is the minimum frequency f _min and the highest frequency is the maximum frequency f _max , a specific frequency f _mid that is larger than the minimum frequency f _{min and} smaller than the maximum frequency f _max is set. A discharge lamp lighting device comprising a timekeeping unit for measuring a cumulative lighting time based on a set value to be performed.   The periodic characteristic point of the AC power supply voltage waveform of the input AC power supply is a voltage value near the zero cross where the AC power supply voltage waveform crosses 0V, or a peak value at which the AC power supply voltage waveform is maximum or minimum. The discharge lamp lighting device according to claim 1, wherein the discharge lamp lighting device has a voltage value in the vicinity. The discharge lamp lighting device further includes:
A dimming rate storage unit for storing the dimming rate corresponding to the cumulative lighting time;
The dimming rate corresponding to the cumulative lighting time measured by the measuring unit is acquired from the dimming rate storage unit, and the dimming signal for lighting the discharge lamp is generated at the dimming rate acquired, and the generated dimming signal is output. A dimming signal generator;
The discharge lamp lighting device according to claim 1 or 2, further comprising: The set value is
“Specific frequency f _mid = 2 (f _min × f _max ) / (f _min + f _max )”
The discharge lamp lighting device according to any one of claims 1 to 3, wherein the specific frequency f _mid calculated in step (1) is set. The discharge lamp lighting device according to any one of claims 1 to 3, wherein the set value is a specific frequency f _mid that is greater than a minimum frequency of 50 Hz and less than a maximum frequency of 60 Hz. The set value, the discharge lamp lighting device according to claim 5, characterized in that the 55Hz is the center frequency of the minimum frequency 50Hz and a maximum frequency 60Hz and a specific frequency _{f mid.} When the reference time is the time when the AC power is actually input,
A difference between the cumulative lighting time measured by the time measuring unit when the frequency of the input AC power supply is 50 Hz and the reference time;
A difference between the cumulative lighting time measured by the time measuring unit when the frequency of the input AC power supply is 60 Hz and the reference time;
6. The discharge lamp lighting device according to claim 5, wherein a set value of the specific frequency f _mid is set to 54.5 Hz so as to be substantially the same. The timekeeping section is
“Number of bits b = ROUNDUP (log ₂ (measurement time T × maximum frequency f _max ))”,
“Number of bits b = ROUNDUP (log ₂ (measurement time T × (maximum frequency f _max × 2)))”,
The cumulative lighting time is measured by having a counter circuit with the number of bits b calculated by at least one of the following formulas (where ROUNDUP (X) means rounding up after the decimal point of X). The discharge lamp lighting device according to any one of claims 1 to 3.   9. The time measuring unit determines that the measurement time T has elapsed when a specific bit including the most significant bit is in a predetermined state in the counter circuit, and measures the cumulative lighting time. The discharge lamp lighting device described.   9. The time measuring unit determines whether the measurement time T has elapsed when only the most significant bit or a plurality of consecutive bits from the most significant bit to the lower bit side is in a predetermined state in the counter circuit. The discharge lamp lighting device described.   A lighting fixture comprising the discharge lamp lighting device according to any one of claims 1 to 10. A plurality of lighting fixtures according to claim 11;
An AC power supply for supplying power to a plurality of lighting fixtures;
A switch for turning on / off power supply from the AC power source to the lighting fixture;
A lighting system comprising:

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