WO2013034407A1 - High frequency electronic ballast, high intensitiy discharge lamp and control method thereof - Google Patents

High frequency electronic ballast, high intensitiy discharge lamp and control method thereof Download PDF

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Publication number
WO2013034407A1
WO2013034407A1 PCT/EP2012/065891 EP2012065891W WO2013034407A1 WO 2013034407 A1 WO2013034407 A1 WO 2013034407A1 EP 2012065891 W EP2012065891 W EP 2012065891W WO 2013034407 A1 WO2013034407 A1 WO 2013034407A1
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WO
WIPO (PCT)
Prior art keywords
frequency
sweeping
voltage
electronic ballast
unit
Prior art date
Application number
PCT/EP2012/065891
Other languages
French (fr)
Inventor
Yongzhou Hu
Tao Jin
Xun YUAN
Zhengyu Wang
Original Assignee
Osram Ag
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Publication date
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Publication of WO2013034407A1 publication Critical patent/WO2013034407A1/en

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Classifications

    • 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
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/2885—Static converters especially adapted therefor; Control thereof
    • H05B41/2887—Static converters especially adapted therefor; Control thereof characterised by a controllable bridge in the final stage
    • 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
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2928—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Definitions

  • the present invention relates to a high frequency electronic ballast used in a high intensity discharge lamp.
  • the present invention further relates to a high inten- sity discharge lamp comprising the high frequency electronic ballast, and a control method thereof.
  • the present invention proposes a high frequency electronic ballast used in a high intensity discharge lamp.
  • the high frequency electronic bal- last effectively settles the problem of acoustic resonance as the high frequency electronic ballast is used in a high intensity discharge lamp.
  • the present invention further proposes a high intensity discharge lamp comprising the high frequency electronic ballast, and a method for manu- facturing the same.
  • the first object of the present invention is achieved by a high frequency electronic ballast used in a high intensity discharge lamp, comprising a filter-rectifier unit, and a DC/AC converter connected to the filter-rectifier unit, wherein the high frequency electronic ballast further comprises a control unit which is connected, at one side, to the filter-rectifier unit for collecting a DC voltage and a ripple voltage in the DC voltage, and is connected, at the other side, to a frequency control sweeping unit that produces a control signal based on the DC voltage and the ripple voltage and transmits the control signal to the control unit, the control unit controls the DC/AC converter to output a current having a working frequency in accordance with the control signal, and the working frequency is a frequency which swept with respect to a preset center frequency of the high intensity discharge lamp by a frequency sweeping range.
  • the AC current from an AC power supply is firstly filtered and rectified through the filter-rectifier unit to obtain a DC current, and then the control unit obtains a DC voltage from the DC current, and analyzes the residue ripple voltage in the DC voltage.
  • the control unit employed in the design scheme of the present invention is a controller which is widely used for light- adjusting intelligent control, such as ICB2FL01G type intelligent controller of the INFINEON company, and of course, it can be other types of controllers.
  • any type of intelligent controller can be used in the design scheme of the present invention as long as it has the function of collecting the DC voltage and the ripple voltage of the DC voltage.
  • the designer can acquire the center frequency of the high intensity discharge lamp through the publicly known technical means.
  • the so-called center frequency is the frequency at which the high intensity discharge lamp does not produce acoustic resonance when working.
  • the high intensity discharge lamp cannot work at the center frequency, it is necessary to set a frequency range, viz. working frequency for the high intensity discharge lamp, and the high intensity discharge lamp does not produce acoustic resonance when working within the working frequency range.
  • the working frequency is a fre- quency of sweeping at a frequency sweeping range with respect to a preset center frequency of the high intensity discharge lamp.
  • the frequency sweeping range can be detected by those skilled in the art through known technical means. Therefore, when the high frequency electronic ballast of the present invention is used, the high intensity discharge lamp will not produce acoustic resonance during working.
  • control unit comprises a first port for out- putting the DC voltage, and a second port for outputting the ripple voltage.
  • the control unit exchanges signals with the frequency control sweeping unit through the two ports.
  • the frequency control sweeping unit comprises a frequency control circuit which is connected to the first port for receiving the DC voltage as a first input signal, and a frequency sweeping circuit which is connected to the second port for receiving the ripple voltage, and the frequency sweeping circuit outputs, in accordance with the ripple voltage, a second input signal for the frequency control circuit, and the frequency control circuit outputs the control signal in accordance with the first input signal and the second input signal.
  • the control signal is actually corresponding to the actual working frequency of the current inputted to the high intensity dis- charge lamp.
  • the control unit can control, in accordance with the control signal, the DC/AC converter to output a current having a working frequency.
  • the frequency control circuit comprises a first resistance, wherein one end of the first resistance is con- nected to the first port and the other end of the first resistance is connected to grounded, and the resistance value of the first resistance is determined by the preset center frequency. Since the center frequency at which the high intensity discharge lamp does not produce acoustic resonance during normal operation is acquired through known technical means, the resistance value of the first resistance can be calculated through the center frequency, wherein the formula
  • f RUN is the preset center frequency
  • R FR UN represents a resistance value of the first resistance.
  • the center frequency can be obtained by applying the DC voltage from the control unit to the first resistance .
  • the frequency sweeping circuit comprises a second resistance and a capacitor which are connected between the first port and the second port, wherein the frequency sweeping circuit is connected to ground between the second resistance and the capacitor, wherein the value of the resistance and the capacitor are determined by the value of the frequency sweeping range.
  • the frequency sweeping range can be detected by those skilled in the art through known technical means, those skilled in the art could obtain the frequency sweeping range by making experiments continuously, for example, combining resistances of different resistance values and capacitors of different capacities.
  • the ripple voltage from the control unit is applied to the capacitor and the resistance, so as to produce a potential affecting the first resistance.
  • the first resistance produces a control signal representing the working frequency of sweeping around the center frequency and within the frequency sweeping range.
  • a value of the frequency sweeping range is arbitrary numerical value between 100 Hz and 100 KHz.
  • the frequency sweeping range can be other ranges, as the high intensity discharge lamps used are different.
  • the filter-rectifier unit is designed as a boost type power factor rectifying unit, which controls the rectified current, effectively avoids the formation of current pulse, and thereby, achieves the object of improving power factor.
  • Another object of the present invention is achieved by a high intensity discharge lamp, which comprises the above high frequency electronic ballast.
  • the high intensity discharge lamp of the present invention can reliably avoid the production of acoustic resonance, when it works employing the high frequency electronic ballast.
  • the last object of the present invention is achieved by a method for controlling a high intensity discharge lamp using the above high frequency electronic ballast, the method com- prising the steps of: a) setting a center frequency which does not incur acoustic resonance and a frequency sweeping range; b) using the control unit to collect a DC voltage from the filter-rectifier unit and a ripple voltage in the DC voltage; c) the frequency control sweeping unit outputting a control signal based on the DC voltage and the ripple voltage; and d) the control unit controlling the DC/AC converter to output a current having the working frequency in accordance with the control signal, the working frequency is a frequency which swept with respect to a preset center fre- quency of the high intensity discharge lamp by a frequency sweeping range.
  • the current having the working frequency can be provided to the high intensity discharge lamp, and the working frequency is a frequency of sweeping at a frequency sweeping range with respect to the preset center frequency of the high intensity discharge lamp.
  • the center frequency and the frequency sweeping range at which the high intensity discharge lamp does not produce acoustic resonance have already been determined, the production of acoustic resonance can be effectively avoided when the high intensity discharge lamp works employing the high frequency electronic ballast.
  • a frequency control circuit of the frequency control sweeping unit is connected to the first port for obtaining the DC voltage as a first input signal
  • a frequency sweeping circuit of the frequency control sweeping unit is connected to the second port for receiving the ripple voltage and outputsa second input signal for the frequency control circuit, in accordance with the ripple voltage
  • the frequency control circuit outputs the control signal in accordance with the first input signal and the second input signal.
  • Fig. 1 is a structural block diagram of the high frequency electronic ballast according to the present invention
  • Fig. 2 is a circuit diagram of the frequency control sweeping unit of the high frequency electronic ballast according to the present invention.
  • Fig. 1 is a structural block diagram of the high frequency electronic ballast according to the present invention. It can be seen from the figure that the high frequency electronic ballast according to the present invention comprises a filter-rectifier unit 1 which is designed as a boost type power factor rectifying unit, a DC/AC converter 2 connected to the filter-rectifier unit 1, and a control unit 3.
  • a filter-rectifier unit 1 which is designed as a boost type power factor rectifying unit
  • a DC/AC converter 2 connected to the filter-rectifier unit 1
  • control unit 3 a control unit 3.
  • the control unit 3 is connected, at one side, to the filter- rectifier unit 1 for collecting a DC voltage from the filter- rectifier unit 1 and a ripple voltage in the DC voltage, and is connected, at the other side, to a frequency control sweeping unit 4 that produces a control signal in accordance with the DC voltage and the ripple voltage and transmits the control signal to the control unit, the control unit 3 controls, in accordance with the control signal, the DC/AC con- verter 2 to output a current having a working frequency, the working frequency is a frequency which swept with respect to a preset center frequency of the high intensity discharge lamp 5 by a frequency sweeping range.
  • control unit 3 employs ICB2FL01G type intelligent controller of the INFINEON company, the ninth pin of the controller is designed into a first port 9 of the control unit, and the tenth pin of the controller is designed into a second port 10 of the control unit 3.
  • the controller can be other types of controllers. Any type of intelligent controller can be used in the design scheme of the present invention as long as it has the function of collecting the DC voltage and the ripple voltage of the DC voltage.
  • the frequency control sweeping unit 4 comprises a frequency control circuit 6 which is connected to the first port 9 for obtaining the DC voltage serving as a first input signal, and a frequency sweeping circuit 7 which is connected to the second port 10 for obtaining the ripple voltage.
  • the frequency sweeping circuit 7 outputs, in accordance with the ripple voltage, a second input signal used in the frequency control circuit 6, and the frequency control circuit 6 outputs the control signal in accordance with the first input signal and the second input signal .
  • Fig. 2 is a circuit diagram of the frequency control sweeping unit 4 of the high frequency electronic ballast according to the present invention.
  • the frequency control circuit 6 comprises a first resistance R73, wherein one end of the first resistance R73 is connected to the first port 9 and the other end of the first resistance R73 is connected to ground, and the resistance value of the first resistance R73 is determined in accordance with the preset center frequency.
  • the frequency sweeping circuit 7 comprises a second resistance R79 and a capacitor C71 which are connected between the first port 9 and the second port 10, wherein the frequency sweeping circuit 7 is connected to ground between the second resistance R79 and the capacitor C71.
  • the designer acquires, with experimental means, a center frequency of a high intensity discharge lamp which does not in- cur acoustic resonance.
  • the center frequency may be 1
  • the resistance value of the first resistance R73 of the frequency control circuit 6 can be calculated based on the for-
  • the control unit 3 is used to collect a DC voltage from the filter-rectifier unit 1 and a ripple voltage in the DC voltage.
  • the frequency control circuit 6 of the frequency control sweeping unit 4 is connected to the first port 9 for receiving the DC voltage as a first input signal, and the frequency sweeping circuit 7 of the frequency control sweeping unit 4 is connect to the second port 10 for receiving the ripple voltage, and outputting, in accordance with the ripple voltage, a second input signal for the frequency control circuit 6, and the frequency control circuit 6 outputs the control signal in accordance with the first input signal and the second input signal.
  • the control unit 3 controls the DC/AC converter 2 to output a current having a working frequency in accordance with the control signal, the working frequency is a frequency which swept with respect to a preset center frequency, for example, 200KHZ, by a preset frequency sweeping range, for example, 5KHz .
  • a preset center frequency for example, 200KHZ
  • a preset frequency sweeping range for example, 5KHz .

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  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

The present invention relates to a high frequency electronic ballast used in a high intensity discharge lamp, comprising a filter-rectifier unit (1), and a DC/AC converter (2) connected to the filter-rectifier unit (1), wherein the high frequency electronic ballast further comprises a control unit (3) which is connected, at one side, to the filter-rectifier unit (1) for collecting a DC voltage and a ripple voltage in the DC voltage, and is connected, at the other side, to a frequency control sweeping unit (4) that produces a control signal based on the DC voltage and the ripple voltage and transmits the control signal to the control unit (3), the control unit (3) controls the DC/AC converter (2) to output a current having a working frequency in accordance with the control signal, the working frequency is a frequency which swept with respect to a preset center frequency of the high intensity discharge lamp (5) by a preset frequency sweeping range. In addition, the present invention further relates to a high intensity discharge lamp, and a method for controlling a high intensity discharge lamp comprising the high frequency electronic ballast.

Description

Description
High Frequency Electronic Ballast, High Intensity Discharge Lamp and Control Method thereof
Technical Field
The present invention relates to a high frequency electronic ballast used in a high intensity discharge lamp. In addition, the present invention further relates to a high inten- sity discharge lamp comprising the high frequency electronic ballast, and a control method thereof.
Background Art
With the implementation of the green project, the wide application of the new power electronics technology to electric lighting has drawn much attention. Thus, it is necessary to seek lighting devices which are green and efficient, have long life and good light color. Among the numerous lamp light sources, high intensity discharge lamps have the highest light efficiency. Moreover, they have the advantages such as long life, good light color, and strong light penetrability. However, due to the shortcomings of low power factor, low light efficiency and large volume, the inductive ballasts which match with the high intensity discharge lamps cannot satisfy people's requirements for green and energy- saving lighting devices. Therefore, it is necessary to design an electronic ballast with high power factor, high light efficiency, small volume, and excellent electromagnetic compatibility to match with the high intensity discharge lamps. In the prior art, people use high frequency electronic bal- lasts to match with high intensity discharge lamps (HID) . However, due to the acoustic vibration of the high intensity discharge lamps, viz. acoustic resonance occurs to the high intensity discharge lamps at a certain frequency and the resonance range almost covers the entire high-frequency area, it is difficult to design a high frequency electronic ballast used in a high intensity discharge lamp.
Summary of the Invention
In order to settle the above problem, the present invention proposes a high frequency electronic ballast used in a high intensity discharge lamp. The high frequency electronic bal- last effectively settles the problem of acoustic resonance as the high frequency electronic ballast is used in a high intensity discharge lamp. In addition, the present invention further proposes a high intensity discharge lamp comprising the high frequency electronic ballast, and a method for manu- facturing the same.
The first object of the present invention is achieved by a high frequency electronic ballast used in a high intensity discharge lamp, comprising a filter-rectifier unit, and a DC/AC converter connected to the filter-rectifier unit, wherein the high frequency electronic ballast further comprises a control unit which is connected, at one side, to the filter-rectifier unit for collecting a DC voltage and a ripple voltage in the DC voltage, and is connected, at the other side, to a frequency control sweeping unit that produces a control signal based on the DC voltage and the ripple voltage and transmits the control signal to the control unit, the control unit controls the DC/AC converter to output a current having a working frequency in accordance with the control signal, and the working frequency is a frequency which swept with respect to a preset center frequency of the high intensity discharge lamp by a frequency sweeping range. In the design scheme of the present invention, the AC current from an AC power supply is firstly filtered and rectified through the filter-rectifier unit to obtain a DC current, and then the control unit obtains a DC voltage from the DC current, and analyzes the residue ripple voltage in the DC voltage. The control unit employed in the design scheme of the present invention is a controller which is widely used for light- adjusting intelligent control, such as ICB2FL01G type intelligent controller of the INFINEON company, and of course, it can be other types of controllers. For the design points of the present invention, any type of intelligent controller can be used in the design scheme of the present invention as long as it has the function of collecting the DC voltage and the ripple voltage of the DC voltage. In addition, according to the design scheme of the present invention, at the beginning of designing, the designer can acquire the center frequency of the high intensity discharge lamp through the publicly known technical means. The so- called center frequency is the frequency at which the high intensity discharge lamp does not produce acoustic resonance when working. However, since the working condition of the high intensity discharge lamp varies in different time periods, for example, at the starting stage, the high intensity discharge lamp cannot work at the center frequency, it is necessary to set a frequency range, viz. working frequency for the high intensity discharge lamp, and the high intensity discharge lamp does not produce acoustic resonance when working within the working frequency range. In the design scheme of the present invention, the working frequency is a fre- quency of sweeping at a frequency sweeping range with respect to a preset center frequency of the high intensity discharge lamp. The frequency sweeping range can be detected by those skilled in the art through known technical means. Therefore, when the high frequency electronic ballast of the present invention is used, the high intensity discharge lamp will not produce acoustic resonance during working.
Preferably, the control unit comprises a first port for out- putting the DC voltage, and a second port for outputting the ripple voltage. The control unit exchanges signals with the frequency control sweeping unit through the two ports.
Preferably, the frequency control sweeping unit comprises a frequency control circuit which is connected to the first port for receiving the DC voltage as a first input signal, and a frequency sweeping circuit which is connected to the second port for receiving the ripple voltage, and the frequency sweeping circuit outputs, in accordance with the ripple voltage, a second input signal for the frequency control circuit, and the frequency control circuit outputs the control signal in accordance with the first input signal and the second input signal. In practical operation, the control signal is actually corresponding to the actual working frequency of the current inputted to the high intensity dis- charge lamp. The control unit can control, in accordance with the control signal, the DC/AC converter to output a current having a working frequency.
Preferably, the frequency control circuit comprises a first resistance, wherein one end of the first resistance is con- nected to the first port and the other end of the first resistance is connected to grounded, and the resistance value of the first resistance is determined by the preset center frequency. Since the center frequency at which the high intensity discharge lamp does not produce acoustic resonance during normal operation is acquired through known technical means, the resistance value of the first resistance can be calculated through the center frequency, wherein the formula
_ 5■ KQHz
FRUN ~~ r
J RUN
is , wherein fRUN is the preset center frequency, and RFRUN represents a resistance value of the first resistance. Thus, the center frequency can be obtained by applying the DC voltage from the control unit to the first resistance .
According to a preferred design scheme of the present invention, the frequency sweeping circuit comprises a second resistance and a capacitor which are connected between the first port and the second port, wherein the frequency sweeping circuit is connected to ground between the second resistance and the capacitor, wherein the value of the resistance and the capacitor are determined by the value of the frequency sweeping range. As the frequency sweeping range can be detected by those skilled in the art through known technical means, those skilled in the art could obtain the frequency sweeping range by making experiments continuously, for example, combining resistances of different resistance values and capacitors of different capacities. In practical opera- tion, the ripple voltage from the control unit is applied to the capacitor and the resistance, so as to produce a potential affecting the first resistance. Thus, under the influence, the first resistance produces a control signal representing the working frequency of sweeping around the center frequency and within the frequency sweeping range.
In the preferred design scheme of the present invention, a value of the frequency sweeping range is arbitrary numerical value between 100 Hz and 100 KHz. Of course, the frequency sweeping range can be other ranges, as the high intensity discharge lamps used are different. According to the present invention, the filter-rectifier unit is designed as a boost type power factor rectifying unit, which controls the rectified current, effectively avoids the formation of current pulse, and thereby, achieves the object of improving power factor.
Another object of the present invention is achieved by a high intensity discharge lamp, which comprises the above high frequency electronic ballast. The high intensity discharge lamp of the present invention can reliably avoid the production of acoustic resonance, when it works employing the high frequency electronic ballast.
The last object of the present invention is achieved by a method for controlling a high intensity discharge lamp using the above high frequency electronic ballast, the method com- prising the steps of: a) setting a center frequency which does not incur acoustic resonance and a frequency sweeping range; b) using the control unit to collect a DC voltage from the filter-rectifier unit and a ripple voltage in the DC voltage; c) the frequency control sweeping unit outputting a control signal based on the DC voltage and the ripple voltage; and d) the control unit controlling the DC/AC converter to output a current having the working frequency in accordance with the control signal, the working frequency is a frequency which swept with respect to a preset center fre- quency of the high intensity discharge lamp by a frequency sweeping range.. In operating the high intensity discharge lamp according to the method of the present invention, the current having the working frequency can be provided to the high intensity discharge lamp, and the working frequency is a frequency of sweeping at a frequency sweeping range with respect to the preset center frequency of the high intensity discharge lamp. As at the beginning of the designing, the center frequency and the frequency sweeping range at which the high intensity discharge lamp does not produce acoustic resonance have already been determined, the production of acoustic resonance can be effectively avoided when the high intensity discharge lamp works employing the high frequency electronic ballast.
Preferably, in the step c) , a frequency control circuit of the frequency control sweeping unit is connected to the first port for obtaining the DC voltage as a first input signal, and a frequency sweeping circuit of the frequency control sweeping unit is connected to the second port for receiving the ripple voltage and outputsa second input signal for the frequency control circuit, in accordance with the ripple voltage, , the frequency control circuit outputs the control signal in accordance with the first input signal and the second input signal. Through the method, the current having the working frequency of sweeping around the center frequency and at the frequency sweeping range is provided to the high intensity discharge lamp. Brief Description of the Drawings
The drawings form a part of the specification, which are used to facilitate understanding of the present invention. The drawings illustrate the embodiments of the present invention and explain, together with the specification, the principle of the present invention. In the drawings, the same components are denoted with the same reference sign. The drawings illustrate :
Fig. 1 is a structural block diagram of the high frequency electronic ballast according to the present invention; and Fig. 2 is a circuit diagram of the frequency control sweeping unit of the high frequency electronic ballast according to the present invention.
Detailed Description of the Embodiments Fig. 1 is a structural block diagram of the high frequency electronic ballast according to the present invention. It can be seen from the figure that the high frequency electronic ballast according to the present invention comprises a filter-rectifier unit 1 which is designed as a boost type power factor rectifying unit, a DC/AC converter 2 connected to the filter-rectifier unit 1, and a control unit 3. The control unit 3 is connected, at one side, to the filter- rectifier unit 1 for collecting a DC voltage from the filter- rectifier unit 1 and a ripple voltage in the DC voltage, and is connected, at the other side, to a frequency control sweeping unit 4 that produces a control signal in accordance with the DC voltage and the ripple voltage and transmits the control signal to the control unit, the control unit 3 controls, in accordance with the control signal, the DC/AC con- verter 2 to output a current having a working frequency, the working frequency is a frequency which swept with respect to a preset center frequency of the high intensity discharge lamp 5 by a frequency sweeping range. In the embodiment, the control unit 3 employs ICB2FL01G type intelligent controller of the INFINEON company, the ninth pin of the controller is designed into a first port 9 of the control unit, and the tenth pin of the controller is designed into a second port 10 of the control unit 3. Of course, according to the design concept of the present invention, the controller can be other types of controllers. Any type of intelligent controller can be used in the design scheme of the present invention as long as it has the function of collecting the DC voltage and the ripple voltage of the DC voltage.
In addition, it can be seen from Fig. 1, the frequency control sweeping unit 4 comprises a frequency control circuit 6 which is connected to the first port 9 for obtaining the DC voltage serving as a first input signal, and a frequency sweeping circuit 7 which is connected to the second port 10 for obtaining the ripple voltage. The frequency sweeping circuit 7 outputs, in accordance with the ripple voltage, a second input signal used in the frequency control circuit 6, and the frequency control circuit 6 outputs the control signal in accordance with the first input signal and the second input signal .
Fig. 2 is a circuit diagram of the frequency control sweeping unit 4 of the high frequency electronic ballast according to the present invention. It can be seen from the figure, the frequency control circuit 6 comprises a first resistance R73, wherein one end of the first resistance R73 is connected to the first port 9 and the other end of the first resistance R73 is connected to ground, and the resistance value of the first resistance R73 is determined in accordance with the preset center frequency. The frequency sweeping circuit 7 comprises a second resistance R79 and a capacitor C71 which are connected between the first port 9 and the second port 10, wherein the frequency sweeping circuit 7 is connected to ground between the second resistance R79 and the capacitor C71.
In a specific embodiment of the present invention, firstly, the designer acquires, with experimental means, a center frequency of a high intensity discharge lamp which does not in- cur acoustic resonance. According to the diversity of the high intensity discharge lamp, the center frequency may be 1
arbitrary frequency between 2KHz and 2000KHz. Meanwhile, the designer further needs to set a frequency sweeping range, such as a frequency sweeping range from -2KHz to 2KHz, the high intensity discharge lamp will not produce acoustic reso- nance when working at the preset center frequency in the frequency sweeping range. Through the preset center frequency, the resistance value of the first resistance R73 of the frequency control circuit 6 can be calculated based on the for-
_ 5■ KQHz
FRUN ~~ r
J RUN
mula , and the resistance value of the second resistance R79 of the frequency sweeping circuit 7 and the value of the capacitor C71 are deduced based on the preset frequency sweeping range. Secondly, the control unit 3 is used to collect a DC voltage from the filter-rectifier unit 1 and a ripple voltage in the DC voltage. The frequency control circuit 6 of the frequency control sweeping unit 4 is connected to the first port 9 for receiving the DC voltage as a first input signal, and the frequency sweeping circuit 7 of the frequency control sweeping unit 4 is connect to the second port 10 for receiving the ripple voltage, and outputting, in accordance with the ripple voltage, a second input signal for the frequency control circuit 6, and the frequency control circuit 6 outputs the control signal in accordance with the first input signal and the second input signal. Lastly, the control unit 3 controls the DC/AC converter 2 to output a current having a working frequency in accordance with the control signal, the working frequency is a frequency which swept with respect to a preset center frequency, for example, 200KHZ, by a preset frequency sweeping range, for example, 5KHz . Thus, the high intensity discharge lamp steadily works in a frequency window which does not incur acoustic resonance . The descriptions above are only preferable embodiments of the present invention and are not used to restrict the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modifica- tions, equivalent substitutions, improvements etc. within the spirit and principle of the present invention shall all be included in the scope of protection of the present invention.
List of reference signs
1 filter-rectifier unit
2 DC/AC converter
3 control unit
4 frequency control sweeping unit
5 high intensity discharge lamp
6 frequency control circuit
7 frequency sweeping circuit 9 first port
10 second port
R73 first resistance
R79 second resistance
C71 capacitor

Claims

Patent claims
1. A high frequency electronic ballast used in a high intensity discharge lamp, comprising a filter-rectifier unit (1) , and a DC/AC converter (2) connected to the filter-rectifier unit (1), characterized in that, the high frequency electronic ballast further comprises a control unit (3) which is connected, at one side, to the filter-rectifier unit (1) for collecting a DC voltage and a ripple voltage in the DC volt- age, and is connected, at the other side, to a frequency control sweeping unit (4) that produces a control signal based on the DC voltage and the ripple voltage and transmits the control signal to the control unit (3), the control unit (3) controls the DC/AC converter (2) to output a current having a working frequency in accordance with the control signal, the working frequency is a frequency which swept with respect to a preset center frequency of the high intensity discharge lamp (5) by a frequency sweeping range.
2. The high frequency electronic ballast according to Claim
1, characterized in that, the control unit (3) comprises a first port (9) outputting the DC voltage, and a second port (10) outputting the ripple voltage.
3. The high frequency electronic ballast according to Claim
2, characterized in that, the frequency control sweeping unit (4) comprises a frequency control circuit (6) which is connected to the first port (9) for receiving the DC voltage as a first input signal, and a frequency sweeping circuit (7) which is connect to the second port (10) for receiving the ripple voltage, and the frequency sweeping circuit (7) outputs, in accordance with the ripple voltage, a second input signal for frequency control circuit (6), and the frequency control circuit (6) outputs the control signal in accordance with the first input signal and the second input signal .
4. The high frequency electronic ballast according to Claim
3, characterized in that, the frequency control circuit (6) comprises a first resistance (R73), wherein one end of the first resistance (R73) is connected to the first port (9) and the other end of the first resistance (R73) is connected to ground, and the resistance value of the first resistance (R73) is determined by the preset center frequency.
5. The high frequency electronic ballast according to Claim
4, characterized in that, the resistance value of the first resistance (R73) is calculated based on the formula
Figure imgf000015_0001
, wherein fRUN is the preset center fre- quency, and RFRUN represents a resistance value.
6. The high frequency electronic ballast according to Claim 3, characterized in that, the frequency sweeping circuit (7) comprises a second resistance (R79) and a capacitor (C71) which are connected between the first port (9) and the second port (10) , wherein the frequency sweeping circuit (7) is connected to ground between the second resistance (R79) and the capacitor (C71) .
7. The high frequency electronic ballast according to Claim
6, characterized in that, the value of the second resistance (R79) and the capacitor (C71) are determined by the value of the frequency sweeping range.
8. The high frequency electronic ballast according to Claim
7, characterized in that, a value of the frequency sweeping range is arbitrary numerical value in the range from 100Hz to ΙΟΟΚΗζ .
9. The high frequency electronic ballast according to any one of Claims 1 to 8, characterized in that, the filter- rectifier unit (1) is designed as a boost type power factor rectifying unit.
10. A high intensity discharge lamp, characterized in that, the high intensity discharge lamp comprises a high frequency electronic ballast according to any one of Claims 1 to 8.
11. A method for controlling a high intensity discharge lamp using a high frequency electronic ballast according to any one of Claims 1 to 9 , characterized by comprising the steps of :
a) setting a center frequency which does not incur acoustic resonance and a frequency sweeping range ;
b) using the control unit (3) to collect a DC voltage from the filter-rectifier unit (1) and a ripple voltage in the DC voltage;
c) the frequency control sweeping unit (4) outputting a control signal based on the DC voltage and the ripple voltage; and
d) the control unit (3) controlling the DC/AC converter (2) to output a current having the working frequency in accordance with the control signal, the working frequency is a frequency which swept with respect to a preset center frequency of the high intensity discharge lamp (5) by a frequency sweeping range .
12. The method according to Claim 11, characterized in that, in the step c) , a frequency control circuit (6) of the frequency control sweeping unit (4) is connected to the first port (9) for receiving the DC voltage as a first input sig- nal, and a frequency sweeping circuit (7) of the frequency control sweeping unit (4) is connect to the second port (10) for receiving the ripple voltage and outputs a second input signal for the frequency control circuit (6) in accordance with the ripple voltage, the frequency control circuit (6) outputs the control signal in accordance with the first input signal and the second input signal .
PCT/EP2012/065891 2011-09-08 2012-08-14 High frequency electronic ballast, high intensitiy discharge lamp and control method thereof WO2013034407A1 (en)

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CN201110265962.6 2011-09-08

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Citations (3)

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Publication number Priority date Publication date Assignee Title
DE4234358A1 (en) * 1992-10-12 1993-02-25 Juerg Nigg Driving gas discharge or fluorescent lamp - using frequency modulated supply from DC or AC source with centre frequency between 15 and 100 kHz
US20030127993A1 (en) * 2002-01-10 2003-07-10 Erhardt Robert A. High frequency electronic ballast
DE102006010998A1 (en) * 2006-03-09 2007-09-13 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit arrangement for operating a consumer and method for operating a consumer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4234358A1 (en) * 1992-10-12 1993-02-25 Juerg Nigg Driving gas discharge or fluorescent lamp - using frequency modulated supply from DC or AC source with centre frequency between 15 and 100 kHz
US20030127993A1 (en) * 2002-01-10 2003-07-10 Erhardt Robert A. High frequency electronic ballast
DE102006010998A1 (en) * 2006-03-09 2007-09-13 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit arrangement for operating a consumer and method for operating a consumer

Non-Patent Citations (1)

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Title
CHENG C-A ET AL: "Design and implementation of frequency-modulated electronic ballast for metal-halide lamps", IEE PROCEEDINGS: ELECTRIC POWER APPLICATIONS, INSTITUTION OF ELECTRICAL ENGINEERS, GB, vol. 153, no. 5, 1 September 2006 (2006-09-01), pages 702 - 710, XP006027270, ISSN: 1350-2352, DOI: 10.1049/IP-EPA:20060011 *

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