CN110933797A - Discharge lamp lighting device - Google Patents
Discharge lamp lighting device Download PDFInfo
- Publication number
- CN110933797A CN110933797A CN201910749010.8A CN201910749010A CN110933797A CN 110933797 A CN110933797 A CN 110933797A CN 201910749010 A CN201910749010 A CN 201910749010A CN 110933797 A CN110933797 A CN 110933797A
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- Prior art keywords
- lighting device
- lamp lighting
- switching element
- drive signal
- discharge lamp
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
Abstract
The invention alleviates surge current and restrains the damage of a switch element. The discharge lamp lighting device of the embodiment includes a detection unit and a generation unit. The detection section detects an activation signal, which is a signal indicating activation of the lamp load. The generating unit generates a drive signal for driving a switching element connected to each of both ends of a converter that supplies power to a lamp load when the detecting unit detects the start signal. The generation unit gradually reduces the pulse period to a steady pulse period, which is a pulse period in a steady state, in an initial state in which generation of the drive signal is started, while keeping the pulse width of the drive signal constant.
Description
Technical Field
Embodiments of the present invention relate to a discharge lamp lighting device.
Background
Conventionally, a barrier discharge lamp (barrier discharge lamp) such as an excimer lamp (excimer lamp) or a rare gas fluorescent lamp has been used as a light source for commercial use. A discharge lamp lighting device that lights such a discharge lamp alleviates a generated inrush current (inrush current) by performing a so-called soft start (soft start) in which a pulse width (pulse width) of a drive signal applied to a switching element connected to a transformer (transformer) is shortened at the time of starting.
[ Prior art documents ]
[ patent document ]
[ patent document 1] Japanese patent application laid-open No. 2002-136114
Disclosure of Invention
[ problems to be solved by the invention ]
However, in the above-described conventional technique, since the frequency of the pulse of the drive signal is constant and the pulse width shortening control is performed on the drive signal, the stress cycle when the surge is generated to the switching element is not changed, and when the input power is large, the stress that the surge is generated to the switching element may be generated, and the switching element may be damaged.
The present invention provides a discharge lamp lighting device capable of alleviating surge current and suppressing damage of a switching element.
[ means for solving problems ]
The discharge lamp lighting device of the embodiment includes a detection unit and a generation unit. The detection section detects a start signal, which is a signal indicating start of a lamp load. The generating unit generates a drive signal for driving a switching element, which is connected to both ends of a converter that supplies power to the lamp load, when the detecting unit detects the start signal. The generating unit gradually reduces the pulse period to a steady pulse period, which is a pulse period in a steady state, in an initial state in which generation of the drive signal is started, while keeping the pulse width of the drive signal constant.
In the discharge lamp lighting device, the generator may fix the pulse width in the steady state to 1/2 or less of the pulse period to generate the drive signal. In the discharge lamp lighting device, the generator inputs the driving signals in opposite phases to the switching elements, respectively. In the Discharge lamp lighting device, the lamp load is a Dielectric Barrier Discharge (Dielectric Barrier Discharge) lamp.
[ Effect of the invention ]
According to the present invention, the surge current can be alleviated, and the breakage of the switching element can be suppressed.
Drawings
Fig. 1 is a schematic diagram of a discharge lamp lighting device according to an embodiment.
Fig. 2 is a block diagram of a power supply device of the embodiment.
Fig. 3 is a diagram showing a specific example of the drive signal in the initial state of the embodiment.
Fig. 4 is a diagram showing a specific example of the pulse frequency of the drive signal.
Fig. 5 is a flowchart showing a processing procedure executed by the power supply device according to the embodiment.
[ description of symbols ]
1: power supply device
10: control unit
11: probe unit
12: generating section
20: storage unit
21: pulse information
50: lamp load
100: discharge lamp lighting device
f1, f 2: frequency of pulses
And fi: initial pulse frequency
fs: steady pulse frequency
L1, L2: primary coil
L3: secondary coil
Q1: a first switch element
Q2: second switch element
S101 to S105: step (ii) of
SW: switch with a switch body
T: transformer device
Ton: conduction time
Toff-1, Toff-2: off time
VDD: direct current power supply
Detailed Description
The discharge lamp lighting device 100 of the embodiment described below includes a detector 11 and a generator 12. The detection section 11 detects an activation signal, which is a signal indicating activation of the lamp load 50. When the detector 11 detects the start signal, the generator 12 generates a drive signal for driving a first switching element Q1 and a second switching element Q2, the first switching element Q1 and the second switching element Q2 being connected to both ends of a transformer T (corresponding to a converter) that supplies power to the lamp load 50. In an initial state where the generation of the drive signal is started, the generation unit 12 gradually reduces the pulse period to a steady pulse period, which is a pulse period in a steady state, while keeping the pulse width of the drive signal constant.
In the discharge lamp lighting device 100 of the embodiment described below, the generation unit 12 generates the drive signal by fixing the pulse width in the steady state to 1/2 or less of the pulse period.
In the discharge lamp lighting device 100 according to the embodiment described below, the generation unit 12 inputs the drive signals of the opposite phases to the first switching element Q1 and the second switching element Q2, respectively.
(embodiment mode)
Hereinafter, the discharge lamp lighting device 100 according to the embodiment will be described with reference to the drawings. In the embodiments, the same reference numerals are given to the components having the same functions, and redundant description is omitted. In the following, a case where the lamp load 50 is an excimer discharge lamp will be described, but the lamp load 50 is not limited thereto.
First, an outline of a discharge lamp lighting device according to an embodiment will be described with reference to fig. 1. Fig. 1 is a schematic diagram of a discharge lamp lighting device according to an embodiment. As shown in fig. 1, the discharge lamp lighting device 100 includes a power supply device 1, a lamp load 50, a transformer T, a first switching element Q1, a second switching element Q2, and a switch (switch) SW.
The transformer T is an insulated transformer, and includes a primary coil L1, a primary coil L2, and a secondary coil L3. A dc power supply VDD is connected to a midpoint between the primary coil L1 and the primary coil L2, and a first switching element Q1 and a second switching element Q2 are provided at both ends of the primary coil L1 and the primary coil L2, respectively.
The first switching element Q1 and the second switching element Q2 are, for example, Metal Oxide Semiconductor Field Effect Transistors (MOSFETs). The sources (sources) of the first switching element Q1 and the second switching element Q2 are connected to the primary coil L1 and the primary coil L2, respectively, and the drains (drains) of the first switching element Q1 and the second switching element Q2 are connected to the ground (ground), respectively.
The power supply device 1 is configured to be able to supply an ac output current to the lamp load 50 through the transformer T by inputting Pulse Width Modulation (PWM) of the reverse phase as a drive signal to the first switching element Q1 and the second switching element Q2, respectively.
The switch SW is a device that outputs a start signal, which is a signal indicating the start of the lamp load 50, to the power supply device 1. The switch SW is a switch for turning on or off the lamp load 50, and inputs an activation signal to the power supply device 1 in accordance with an operation by a user, for example.
In addition, the switch SW can input not only an activation signal but also a control signal for controlling dimming of the lamp load 50 to the power supply apparatus 1. In this case, the power supply device 1 can also control dimming based on the control signal. More specifically, the power supply apparatus 1 can control dimming of the lamp load 50 by controlling the pulse frequency of the driving signal input to the first switching element Q1 and the second switching element Q2 based on the control signal.
The lamp load 50 is a dielectric barrier discharge lamp, and a rare gas such as argon, xenon, or neon, or a gas such as nitrogen or helium is sealed as a discharge gas. The lamp load 50 has both ends connected to the secondary coil L3, and is turned on by an output current output from the secondary coil L3. The lamp load 50 is not limited to the dielectric barrier discharge lamp, and may be another Light source such as a Light Emitting Diode (LED).
Next, a configuration example of the power supply device 1 according to the embodiment will be described with reference to fig. 2. Fig. 2 is a block diagram of the power supply device 1 of the embodiment. As shown in fig. 2, the power supply device 1 includes a control unit 10 and a storage unit 20.
The control unit 10 includes a detection unit 11 and a generation unit 12. The control Unit 10 is an electronic Circuit such as a Central Processing Unit (CPU) or a microprocessor Unit (MPU), an Application Specific Integrated Circuit (ASIC), an Integrated Circuit such as a Field Programmable Gate Array (FPGA), or the like, and executes the overall control of the power supply device 1. The control unit 10 is not limited to the above, and may control the frequency of the pulse by a Voltage Controlled Oscillator (VCO), for example.
The storage unit 20 is realized by, for example, a semiconductor Memory element such as a Random Access Memory (RAM) or a Flash Memory (Flash Memory), or a storage device such as a hard disk or an optical disk. As shown in fig. 2, the storage unit 20 of the embodiment stores pulse information 21. In addition, with respect to a specific example of the pulse information 21, the following will be described using fig. 4.
The detection portion 11 of the control portion 10 detects an activation signal, which is a signal indicating activation of the lamp load 50. The detector 11 notifies the generator 12 when detecting the start signal input from the switch SW.
When the detector 11 detects the start signal, the generator 12 generates a drive signal for driving a first switching element Q1 and a second switching element Q2, the first switching element Q1 and the second switching element Q2 being connected to both ends of a transformer T that supplies power to the lamp load 50.
For example, the generator 12 can convert electric power supplied from a system power supply, not shown, into a Pulse Width Modulation (PWM) signal, and can input the converted PWM signal as a drive signal to the first switching element Q1 and the second switching element Q2, respectively.
As shown in fig. 1, since the transformer T is a push-pull circuit (push-pull circuit), the generator 12 inputs drive signals of opposite phases to the first switching element Q1 and the second switching element Q2, respectively.
For example, the generator 12 includes an inverter circuit such as a logical negation circuit (also referred to as a NOT circuit), and can convert a drive signal input to one of the first switching element Q1 and the second switching element Q2 into a drive signal of an inverted phase and input the drive signal.
Thus, while the first switching element Q1 is on (conductive state), the second switching element Q2 is off (non-conductive state), and while the second switching element Q2 is conductive, the first switching element Q1 is off. Therefore, the transformer T can generate the output current with high efficiency.
Here, although the case where the generation unit 12 converts the drive signal into the reverse phase by the inverter circuit has been described, the present invention is not limited to this. That is, the generator 12 may generate drive signals of opposite phases and input the drive signals to the first switching element Q1 and the second switching element Q2, respectively.
Further, there is a discharge lamp lighting device that alleviates a generated inrush current by performing so-called soft start in which a pulse width of a drive signal is shortened, when lighting of a lamp load is started. In the discharge lamp lighting device, although the generated inrush current can be alleviated, since the frequency of the pulse of the drive signal is fixed and the pulse width reduction control is performed on the drive signal, the stress cycle when the surge is generated to the switching element does not change, and when the input power is large, stress that generates the surge to the switching element may be generated, which may cause breakage of the switching element.
In contrast, the generation unit 12 of the present embodiment can reduce the stress cycle at the time of surge by varying the pulse frequency of the drive signal, and can suppress breakage of the switching element (corresponding to the first switching element Q1 and the second switching element Q2) even when the input power is large.
Fig. 3 is a diagram showing a specific example of the drive signal in the initial state. In fig. 3, the vertical axis represents on and off of the drive signal, and the horizontal axis represents time. Here, the initial state refers to a state from the start of lighting of lamp load 50 to the transition to the steady state, and is a period during which a surge current is generated. The steady state is a state in which the lamp load 50 is turned on at a desired lighting frequency.
As shown in fig. 3, in the initial state, the generation unit 12 gradually reduces the off-time Toff during which the drive signal is off, while keeping the on-time Ton during which the drive signal is on constant, and generates the drive signal. In other words, the generation unit 12 gradually increases the pulse frequency to generate the drive signal while keeping the on-time Ton constant.
In the initial state, on-times Ton shown in fig. 3 are all fixed values, and off-time Toff-2, which is the next off-time Toff of off-time Toff-1, is shortened as compared to off-time Toff-1. Therefore, the pulse frequency of the pulse frequency f2 corresponding to the off-time Toff-2 is larger than the pulse frequency f1 corresponding to the off-time Toff-1.
As described above, the generation unit 12 can alleviate the generation of the inrush current flowing into the first switching element Q1 or the second switching element Q2 by gradually increasing the pulse frequency in the initial state while the on-time Ton is fixed.
Further, by gradually shortening the off time Toff, the number of times the first switching element Q1 or the second switching element Q2 is turned on can be suppressed compared to the case where the pulse frequency is fixed in advance. Therefore, breakage of the switching element can be suppressed.
In the present embodiment, the off-time Toff in the initial state can be set longer than in the case where the pulse frequency is fixed in advance. This can suppress an increase in the temperature of particles in the tube during discharge of the lamp load 50, and can improve the lighting efficiency of the lamp load 50.
Further, the on-time Ton is preferably as short as possible. This is because the shorter the on-time Ton, the more rapid the output current from the transformer T to the lamp load 50 becomes, and the lamp load 50 can be lit up with high efficiency.
Further, as the on time Ton is shorter, the excitation time in the transformer T can be shortened, and the heat generation of the transformer T can be suppressed. That is, the reason is that the shorter the on time Ton is, the more efficiently the output current can be generated.
In order to satisfy the condition, the on time Ton is preferably 1/2 or less of the off time Toff in the steady state. More specifically, for example, when the pulse frequency of the drive signal in the steady state is 37kHz, the pulse period is about 30 μ sec, the on time Ton is 4 μ sec to 6 μ sec, and the off time Toff is 21 μ sec to 23 μ sec. In addition, the above-described effect can be obtained as long as the on time Ton satisfies 1/2 or less of the off time Toff in the steady state.
Next, the relationship between the pulse frequency of the drive signal and the elapsed time will be described with reference to fig. 4. Fig. 4 is a diagram showing a specific example of the pulse frequency of the embodiment, and corresponds to an example of the pulse information 21 shown in fig. 2. In fig. 4, the vertical axis represents the pulse frequency of the drive signal, and the horizontal axis represents the time.
As shown in fig. 4, at an initial pulse frequency fi, which is a pulse frequency in an initial state, the pulse frequency linearly increases with the passage of time. Here, the term "linear" is a concept including a predetermined error, and does not strictly mean linear.
The inclination of the initial pulse frequency fi may be arbitrarily changed according to the performance of the lamp load 50 or the response characteristics of the first switching element Q1 and the second switching element Q2. In this case, the initial pulse frequency fi does not necessarily have to rise linearly, and may rise exponentially or logarithmically.
Then, when the pulse period reaches a steady state, the pulse frequency is fixed at a steady pulse frequency fs, which is a steady pulse frequency at the time of steady operation. That is, in the initial state, by shortening the pulse frequency of the drive signal, the inrush current flowing into the first switching element Q1 or the second switching element Q2 can be relaxed, and in the steady state, by fixing the pulse frequency of the drive signal, the lamp load 50 can be lit at a desired lighting frequency.
As a result, as described above, while the generation of the inrush current in the initial state is alleviated, the lamp load 50 can be turned on by arbitrary dimming in the steady state.
The present invention is particularly effective when the discharge lamp lighting device 100 is used for commercial purposes. That is, when the discharge lamp lighting device 100 is used for commercial purposes, relatively large power must be supplied to the lamp load 50, and switching elements having high withstand voltage must be used as the first switching element Q1 and the second switching element Q2.
However, since the response to the drive signal is slow as the switching element has a higher breakdown voltage, if the pulse period is shortened, the response speed of the switching element cannot be matched, and the necessary output current may not be supplied to the lamp load 50.
In contrast, in the discharge lamp lighting device 100 of the embodiment, since the pulse period is sufficiently extended in the initial state, even when a switching element having a high withstand voltage is used, a necessary output current can be supplied to the lamp load 50.
Next, a process procedure executed by the power supply device 1 according to the embodiment will be described with reference to fig. 5. Fig. 5 is a flowchart showing a processing procedure executed by the power supply device 1 according to the embodiment. The above-described processing procedure is repeatedly executed by the control unit 10 of the power supply device 1.
As shown in fig. 5, the power supply device 1 first determines whether or not a start signal for starting the lamp load 50 is detected (step S101). When the power supply device 1 detects the start signal (Yes in step S101), it generates a drive signal of an initial pulse period, which is a pulse period in an initial state (step S102).
Then, the power supply device 1 gradually reduces the pulse period to generate a drive signal (step S103), and determines whether or not the pulse period of the drive signal reaches a steady pulse period which is a pulse period in a steady state (step S104).
When the steady pulse period is reached in the processing of step S104 (Yes in step S104), the power supply device 1 holds the pulse period of the drive signal (step S105), and ends the processing.
On the other hand, if the power supply device 1 does not reach the steady pulse period in the process of step S104 (No in step S104), the process proceeds to step S103. When the power supply device 1 does not detect the start signal in the process of step S101 (No in step S101), the process is terminated as it is. In the processing after step S102, when the start signal cannot be detected, the generation of the drive signal is stopped, and the processing is terminated as it is.
As described above, the discharge lamp lighting device 100 according to the embodiment includes the detector 11 and the generator 12. The detection section 11 detects an activation signal, which is a signal indicating activation of the lamp load 50. When the detector 11 detects the start signal, the generator 12 generates a drive signal for driving a first switching element Q1 and a second switching element Q2, the first switching element Q1 and the second switching element Q2 being connected to both ends of a transformer T (corresponding to a converter) that supplies power to the lamp load 50.
In the discharge lamp lighting device 100 of the above embodiment, the generation unit 12 generates the drive signal by fixing the pulse width in the steady state to 1/2 or less of the pulse period. Therefore, according to the discharge lamp lighting device 100 of the embodiment, the output current can be generated efficiently by the transformer T while the output current is rapidly increased.
In the discharge lamp lighting device 100 of the above embodiment, the generation unit 12 inputs the drive signals of the opposite phases to the first switching element Q1 and the second switching element Q2, respectively. Therefore, according to the discharge lamp lighting device 100 of the embodiment, the output current can be efficiently generated in the transformer T.
In the above embodiment, the case where the load is the lamp load 50 has been described, but the present invention is not limited to this. That is, the present invention can be applied to various loads other than the lamp load 50.
Several embodiments of the present invention have been described, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented by various other embodiments, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and spirit of the invention, and are also included in the invention described in the claims and the equivalent scope thereof.
Claims (4)
1. A discharge lamp lighting device comprising:
a detection section that detects a start signal that is a signal indicating start of a lamp load; and
a generating unit configured to generate a drive signal for driving a switching element, the switching element being connected to each of both ends of a transformer that supplies power to the lamp load, when the detection unit detects the start signal; and is
The generation unit gradually reduces a pulse period to a steady pulse period, which is a pulse period in a steady state, in an initial state in which generation of the drive signal is started, while keeping a pulse width of the drive signal constant.
2. The discharge lamp lighting device according to claim 1, wherein the lamp lighting device further comprises a lamp lighting circuit for lighting a discharge lamp, and the lamp lighting circuit is configured to operate in accordance with the lamp lighting device
The generator generates the drive signal by fixing the pulse width in the steady state to 1/2 or less of the pulse period.
3. The discharge lamp lighting device according to claim 1 or 2, wherein the lamp lighting device further comprises a lamp control unit that controls the lamp lighting device to operate in a non-operating state
The generating unit inputs the drive signals in the opposite phases to the switching elements, respectively.
4. The discharge lamp lighting device according to claim 1, wherein the lamp lighting device further comprises a lamp lighting circuit for lighting a discharge lamp, and the lamp lighting circuit is configured to operate in accordance with the lamp lighting device
The lamp load is a dielectric barrier discharge lamp.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-176554 | 2018-09-20 | ||
| JP2018176554A JP2020047527A (en) | 2018-09-20 | 2018-09-20 | Discharge lamp lighting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110933797A true CN110933797A (en) | 2020-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910749010.8A Pending CN110933797A (en) | 2018-09-20 | 2019-08-14 | Discharge lamp lighting device |
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| Country | Link |
|---|---|
| JP (1) | JP2020047527A (en) |
| CN (1) | CN110933797A (en) |
| TW (1) | TW202013871A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022054799A1 (en) * | 2020-09-10 | 2022-03-17 | ウシオ電機株式会社 | Light source device and sterilization deodorizer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3582928B2 (en) * | 1996-03-18 | 2004-10-27 | 株式会社東芝 | Multi-output DC stabilized power supply |
| JP2009252410A (en) * | 2008-04-02 | 2009-10-29 | Ushio Inc | Discharge lamp device |
| JP6815127B2 (en) * | 2015-09-08 | 2021-01-20 | ローム株式会社 | DC / DC converter, switching power supply |
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2018
- 2018-09-20 JP JP2018176554A patent/JP2020047527A/en active Pending
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2019
- 2019-08-14 CN CN201910749010.8A patent/CN110933797A/en active Pending
- 2019-08-16 TW TW108129203A patent/TW202013871A/en unknown
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| JP2020047527A (en) | 2020-03-26 |
| TW202013871A (en) | 2020-04-01 |
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