WO2012020047A1 - Modulation of a pfc during dc operation - Google Patents

Modulation of a pfc during dc operation

Info

Publication number
WO2012020047A1
WO2012020047A1 PCT/EP2011/063754 EP2011063754W WO2012020047A1 WO 2012020047 A1 WO2012020047 A1 WO 2012020047A1 EP 2011063754 W EP2011063754 W EP 2011063754W WO 2012020047 A1 WO2012020047 A1 WO 2012020047A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
circuit
frequency
value
voltage
switch
Prior art date
Application number
PCT/EP2011/063754
Other languages
German (de)
French (fr)
Inventor
Peter Lampert
Andre Mitterbacher
Original Assignee
Tridonic Gmbh & Co Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

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Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B41/00Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14Circuit arrangements
    • H05B41/26Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28Circuit 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
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B41/00Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14Circuit arrangements
    • H05B41/36Controlling
    • H05B41/38Controlling the intensity of light
    • H05B41/39Controlling the intensity of light continuously
    • H05B41/392Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations

Abstract

An operating appliance for lighting means, in particular of an electronic ballast for gas discharge lamps, has a power factor correction circuit (PFC) for reducing harmonics when the input current is being drawn. In this case, current is received on the input side only during predetermined time periods (tON). The predetermined time period (tON) in which current is drawn is in this case modulated when a DC voltage is applied to the input side, with the frequency shift being load‑dependent.

Description

Modulation of a PFC b "i DC B" tri "b

The invention relates to method for operating an operating device for light sources such as an electronic ballast (EVG) for gas discharge lamps or LEDs. The operating unit here has an actively clocked power factor correction circuit (PFC, Power Factor Correction) to reduce harmonics in the

Input power consumption, which for example. In the form of a switching regulator (boost converter) is formed with a clocked switch, wherein the switch is controlled by a control circuit.

The invention relates. further to a Coraputersoftware program product for supporting such a method, a control module, which can assist by programming and / or hard wiring such a method as well as an operating device for lamps.

As said, the present invention relates to operating devices for loads in the form of lamps having PFC circuits. Such from DE 10128588 Al known operating device is shown in FIG. 1. More specifically, it is in the illustrated in FIG. 1 device is an electronic ballast (EVG). This ballast shown in Fig. 1 on the input side via a

High frequency filter 1 is connected to a power supply voltage Uo. The output of high frequency filter 1 is connected to a rectifier circuit 2 in the form of a full bridge rectifier. The rectified by the rectifier circuit 2

AC supply voltage is at the same time

Input voltage U i is the smoothing circuit 3. This is formed having in the present example by a smoothing capacitor Cl and an inductance LI, a controllable switch in the form of a MOS field effect transistor Sl and a diode Dl-up converter. other switching regulator can be used instead of the boost converter. The PFC circuit is formed by the choice of driving the switch Sl.

By a corresponding switching of the MOS field-effect transistor Sl (see for example also WO 99/34647 Al.) A voltage applied to the subsequently arranged storage capacitor C2 intermediate circuit voltage U in a conventional manner produces z, which is fed to the inverter 4. The inverter 4 is formed in the present example by two further arranged in a half bridge arrangement of MOS field effect transistors S2 and S3. By high frequency clocking of the two switches S2 and S3, a high-frequency alternating voltage is generated at the center tap, which is supplied to the load circuit 5 with the connected gas discharge lamp LA.

The operation of this step-up converter is already known in principle and should therefore be summarized only briefly. If the field effect transistor Sl conductive, the current increases linearly in the inductor LI. however, disables the field effect transistor S, the current discharges into the storage capacitor C2. By carefully controlling the switch Sl, the power consumption of the boost converter and thus also the voltage across the storage capacitor C2 DC link voltage (bus voltage) U can be influenced. 8

takes place controlling the switch Sl of the boost converter by a control circuit 6 which generates corresponding switching information and transmits it to a subsequent to the control circuit 6 the driver circuit. 7 This in turn sets the switching information into corresponding power control signals and controls via the line 14, the gate of the field effect transistor Sl. In the same way by the control circuit 6 and the drive circuit 7 also generates signals for driving the two field effect transistors S2 and S3 of the inverter. 4 All components of the control unit 6 can be synchronized, for example, via a central clock 8, which transmits them corresponding clock signals. The control unit 6 is provided as application specific integrated circuit (ASIC), and accordingly takes a little space.

is carried out calculating the Schaltinforraationen for the switch Sl of the boost converter by a disposed within the control circuit 6, digital control circuit 9. For this purpose, the control circuit 2 the analog / digital converter ADCi and ADC2 on which the power supplied via the input line 15 input voltage iii and on the Uz implement input line 16 supplied DC voltage into digital values. The calculation block 12 serves on the basis of the current value of the intermediate circuit voltage U z to compute an appropriate duty cycle for the switch Sl. Before, however, based on the determined duty cycle of the processing unit 12 a control signal for the switch Sl is generated, the duty cycle is, however, supplemented by an additional value (extended), which is determined by the switching-time extension block. 13 13 For this purpose, the switching time extension block of a memory with a table that associates a particular time interval each value of the input voltage Ui to which the time of the switch Sl is extended. The value of this additional interval is calculated by the calculation block 12 as said duty cycle added and transmitted to an output block. 11 This produces a corresponding switching information that is supplied to the driver circuit 7, which then eventually transmitted by a corresponding control signal via the line 14 to the switch Sl. In the most general manner, the relationship between the Einschaltverlängerung and the input voltage is that the Einschaltverlängerung is the greater, the lower the input voltage Ui is. In particular, so the Einschaltverlängerung in the zero crossings of the sinusoidal AC voltage. be made present at the input.

In addition, it should be noted that the control circuit 6 is also used to operate the two switches S2 and S3 of the inverter. 4 For this purpose, one or more - not shown - analog / digital converter can be provided, which convert the load circuit 5 operating parameters taken into digital values ​​and perform the digital control loop. 9 Shown is a control block 10, which calculates as a function of the input signals, control information for the switches S2 and S3 and transmitted to the driver circuit. 7 In turn, the drive circuit 7 generates corresponding control signals and transmits them over lines 17 and 18 to the gates of two field effect transistors S2 and S3 of the inverter. 4

The described, known from the prior art circuit is well suited for AC operation, finally, the Einschaltzeitdauerverlängerung carried yes depending on a detection of the zero crossings of the applied sinusoidal AC voltage UO Generally, however, upon application of a DC voltage to a circuit of the on period - extension suspended. The application of a DC voltage is for example in emergency mode. So the known circuit operates in emergency mode without Einschaltdauerverlängerung and thus a constant frequency. This fixed operating frequency of

Power factor correction circuit (PFC) 3 thus creating interference with a substantially fixed frequency. This may be problems with the for emergency lighting (DC operation) applicable EMC regulations.

WO 2006/042640 A2 provides for this problem situation by teaching them that even with a DC supply the PFC, which would then actually turn at a constant switching frequency, specifically a change in frequency (a so-called "sweep mode", also called "wobble known ", ie a cyclically recurring acceleration and Verlangsainung is performed at a frequency). In the practical embodiment, this provides, in particular in such a way that, starting gradually from a nominal value for t on the switch of the converter, the t on -time is incremented, and then reduced again until it has dropped below the nominal symmetrically on t -value is. This is repeated cyclically. This means that for the AC mode, known from FIG. 1 circuit may be used. the operating frequency of PFC Meanwhile, in DC operation modulated to speak "water down" the noise spectrum of the circuit in addition to bands outside the center-operating frequency. This allows for compliance with EMC regulations. The modulation may be fed in a change in the change of the on lie (ie extension / shortening of the switch-on time of the clocked switch) and / or the change of the switching frequency.

At low Dimrapegeln and / or at low load, of course, the nominal value of the t on time of switch of the PFC is reduced. Thus, it may happen that, for a reduction of T on -time a very low turn-on is achieved under the nominal value, due to parasitic effects and delay times has only a reduced effect on the PFC circuit. Thus, in this method there is the risk that, in the balanced lowering of the t on -time be achieved improper turn-on times of the switch (as this turn-on, either for individual components can be critical, or can have no effect).

The present invention has therefore set itself the object to provide a method for operating an operating device for light sources provided which ensures reliable operation of the Leuchtraittel.

The invention is the idea further that the "sweep" mode, also known as "wobble ^ depending is adaptively adjustable by the load, wherein the load itself, can be connected to the lamps of different wattage, for example, in multi-lamp device, or can change at different dimming levels.

Therefore, it is reduced at a reduced load and / or reduced sound time for lower dimming level of the frequency deviation such that the deviation so above / below the nominal value is reduced. Thus, in particular prevents that in the balanced lowering of the ton-time invalid (too short) on times were achieved for the switch.

More specifically, the object is solved by the features of the independent claims. The dependent claims further develop the central idea of ​​the invention in a particularly advantageous manner.

According to the invention thus in particular an electronic ballast (EVG) is a method for operating an operating device for loads in the form of Leuchtraitteln, intended for gas discharge lamps. The operating device in this case has a power factor correction circuit (PFC) for reducing harmonics in the Eingangsstromaufnähme. The working frequency of the power factor correction circuit is modulated at an input-application of a DC voltage. The frequency of this modulation is a function of load.

The frequency preferably depends on the wattage of the connected lamps and / or the current dimming level.

The output voltage of the PFC can be controlled. The modulation of frequency can be done by one or more of the following: - modulating a target value of output voltage,

- applying a modulation to a directly or indirectly detected actual value of the output voltage, and / or

- modulating the control value of the control.

The on period t on of the switch is preferably stepwise modulated.

The frequency deviation of the power factor correction circuit (PFC) can be selected depending on the difference between the current nominal value of the on-time and a lower limit value.

It can be automatically switched to the modulation of the timing of the switch of the power factor correction circuit as soon as the application of a DC voltage is detected by the operating unit.

It can also be provided that upon reaching a preset lower threshold of the load, the timing of the switch of the power factor correction circuit is no longer modulated.

In the invention, it is further desired that the first and accordingly a certain Sollbusspannung at the output of the PFC is set a nominal value for the on period of the switch is calculated, and then carried out the modulation of the timing of the switch of the power factor correction circuit.

It may also be provided that upon reaching a predetermined upper threshold of the load, the timing of the switch of the power factor correction circuit normal, that is modulated without a limitation. This means that is carried out fully from a certain power of the sweep mode from the method of this invention and, therefore, the nominal amplitude of the frequency sweep is not restricted. Thus, at higher power, the stronger also EMC load is effectively restricted, the same as in the method known from WO 2006/042640 A2 process.

The power factor correction circuit (PFC) may be in the form of a switching regulator with clocked switch. To reduce disturbances of the switches can be clocked in such a way here that its turn-on time and / or its switching frequency is modulated at an input-side application of a DC voltage.

The modulation frequency of the power factor

Correction circuit (PFC) can be chosen in such a way that in the output voltage of the power factor correction circuit (PFC) sets a corresponding ripple. In other words, the modulation of the PFC circuit, a Zwischenbusregelung is not being controlled by themselves or. Rather, the compensation for this "ripple" (ripple) in the bus voltage is performed (ie, the intermediate circuit voltage, which is output from the power factor correction circuit and applied to the storage capacitor) for keeping constant the power consumption of the lamps with frequency variation of the inverter. For this purpose the control unit may in a per se known way of detecting an operating parameter such as the lamp current and the Larapenspannung and vary depending upon this detection, and a deviation from a target value, the frequency of the inverter. the modulation frequency of the power factor

Correction circuit, for example, in a range between 15 Hz and 500 Hz, preferably between 90 and 400 Hz, can be selected. In the prior art, the modulation is known to be associated with the zero crossings of the AC voltage, so that a modulation frequency of 100 Hz (Europe) or 120 Hz (USA) can result. In the invention, however, the modulation frequency can be freely adjusted and optimized.

Upon application of a DC voltage modulation can of course no longer be triggered by the zero crossings of the input voltage. According to the invention can therefore be provided that the modulation of the PFC circuit is effected by means of a timer circuit, are read out by means of the values ​​from a look-up table. These values are as in the prior art extension values t on the actual regulator controller on the control circuit to be opened. The regulator knob t on is the on period for the switch which has been calculated by a controller for keeping constant the output voltage of the PFC. According to the invention thereby the respective permissible frequency deviation can be stored in a look-up table and, depending are read from the current load state or dimming level. Alternatively, the extension values ​​can be determined based on the deviation of the nominal value of the switch-on time of at least one limit value. According to the invention can be automatically switched to the modulation by means of the timer circuit and the look-up table when the operating device detects the application of a DC voltage. Basically, the automatic detection of the emergency light is already known (application of a DC voltage), from EP 490 329 Bl. Reference is made to the local Fig. 4, reference numerals C25 and R21.

The modulation of the power factor correction circuit (PFC) can also be influenced by specifying at least one limit value, so that the respective permissible frequency deviation may be determined depending on the difference between the current switch-on time and the limit value depends on the current load state or Dirampegel.

The power factor correction circuit (PFC) can be operated in so-called boundary mode between continuous and non-interrupted operation ( "Borderline Mode"). According to the invention a computer software program product is also provided that supports such a method, when run on a computing device in an operating device running or by hard wiring (ASIC) is implemented.

Further, a control device (micro-controller, ASIC, etc.) is provided for operating illuminant device according to the invention, which is designed to support such a process.

Finally, the invention also provides an operating device for lighting means.

Other features, aspects, and advantages of the present invention will be made clear now with reference to the description of an embodiment. In the accompanying figures

Fig. 1 is a prior art document DE 101 28 588 AI known circuit,

Fig. 2a shows a circuit according to the invention,

FIG. 2b shows a further circuit according to the invention, and

Fig. 3 is a diagram for explaining the

erfindungsgeraäßen method.

It is to be understood that according to the invention for the AC operation of the circuit of Fig. 1 can be maintained. Fig. 2a and Fig. 2b show the additional components which may be necessary for an inventive operating with DC line voltage. Incidentally, those members that have the same reference numerals in the two figures correspond.

In order to improve the noise spectrum of the circuit in an emergency operation (DC-AC), the circuit according to the invention as shown in Fig. 2a, a control circuit 6 which by means of a signal 15, representative of the rectified input voltage U i, and a circuit 20 the concern of AC or DC voltage detects. In this case, a circuit can be used, for example, to EP 490 329 Al is generally known from Fig. 4. This DC detection circuit 20 controls a clock generator. 8 This clock generator 8 as it were, replaces the zero crossings of the no longer existing in DC mode mains voltage. The clock generator 8 controls, for example, to read out the renewal values ​​for the on period of the switch Sl from a look-up table. As known in principle from the prior art, the bus voltage is possibly U screened eat z and the control unit 6 is returned (bus voltage 16), ura by varying the switching frequency of the switch S, the bus voltage to regulate U z to a desired value U Vref. The control of the bus voltage so results in a regulator value t on controls for the on and off period of the switch which controller value t on controller also in DC mode with a periodically varying additional value t on_add is applied to the frequency sweep and / or the switching frequency for to modulate improve Störspektruras.

Upon application of an AC voltage control of the bus voltage U z by detecting the bus voltage 16 and by the control circuit 9, however, relatively slow t compared to the modulation frequency or varying the on period on of the switch S, so that this modulation in the bus voltage U z so is not set and the bus voltage in relation to a corresponding switching frequency of the switch Sl will have low frequency ripple.

This ripple of the bus voltage may, however, by the recirculation of the illumination means power reproducing parameter 19 (light source voltage, lamp current, detecting the light output of an optical sensor or the like.) As the actual value and the control of the switching frequency of the inverter 4 for keeping constant the Leuchtraittel performance on a predetermined desired value are compensated. The compensation of the ripple of the bus voltage may also be effected by a so-called "feed-forward" setting the switching frequency of the inverter 4 as an alternative. In particular, the switching frequency of the inverter 4 can be increased and the switching frequency can be lowered with decreasing bus voltage with increasing height of the current bus voltage.

Upon application of a DC voltage read out from the look-up table values can Additional t on_add load 6 in a memory of the ASIC. Then, these values of t onAdd switching time EXTENSION block 13 regular ton_Regler from the controller 12 are added:

In this case is set, and then selects the next index of the look-up table, each index t on for an adjustable period of time (* Sweep value '). By changing the sweep value, the modulation frequency can be adjusted.

Alternatively, they can t on_add additional values also depend on the current nominal value of the switch-sweep mode of the PFC are determined. Such a determination of the frequency deviation is described with reference to FIG. 3.

In the practical embodiment, this provides, in particular in such a way that, starting gradually from a nominal t on value t on control for the switch of the converter, the t on -time is inkreraentiert, and then reduced again until it symmetrically below the nominal t on - has decreased value. This is repeated cyclically. The modulation of. Value is achieved that the T off value is mitmoduliert because the PFC is operated in the borderline mode, ie there is a switching in a choke current - 0. Thus, the PFC-frequency modulated with a frequency deviation which is proportional to t on - modulation. It should be emphasized here is that first the control loop to the output of the PFC to set a specific Sollbusspannung charged a nominal amount for the phase on time, and then this nominal value is deliberately changed over time. The change over time therefore does not arise as an effect of the control algorithm, but is applied only after calculation of the nominal value. Thus, this is also a cyclical change in frequency or t on _ time change occurs when the supply voltage and load are constant.

In order impermissible ON times to prevent at reduced load, ie the "sweep mode" according to the invention depends on the load adaptively adjusted, the load, for example, in multi-lamp devices can be connected to the lamps of different wattage, or even at different dimming levels can change. in particular the frequency deviation for the "sweep" mode of the PFC so it is adjusted depending on the load adaptive.

Fig. 2a shows this example, a further provides a lamp-information reproducing parameters 22, which information about the load connected to the output of block 11. This information may, for example, data on the connected load (such as on detection of the lamp type or wattage and / or their nominal power) to be.

FIG. 2b, however, shows an interface 20 which receives a specification for the desired dimming level via a control line 21. The interface 20 can also be integrated in the control unit. 6 The specification of the dimming level may be present as a digital or analog control signal. This predetermined dimming level (dimming level) is supplied with the parameter 23 to the output block. 11 Thus, the parameters 23 contains information about the load, in particular information about the deviation from the nominal load. This output block 11, with this information then adjust the so-called "sweep odus" adaptively depending on the load as previously described. Not shown in Figure 2b, the influence of the interface on the control of the operating device for changing the brightness. For example, this may in a known be effected by changing the frequency of the inverter, or by changing the on time of the switches of the inverter.

3 shows this in a time-time diagram four examples ((left to right) from "Sweep mode" cycles outgoing each with the nominal value t on regulator rising, falling and then rising gradual changes in the duration of the switch and a nominal amplitude of 200 ns) at different loads, in which the three right-limited due to a low load by the inventive method in its amplitude. the X-axis represents thereby the basic time course without scaling, while the Y-axis represents the time represents duration of the time of the switch, and thus corresponds to the level of the output voltage of the PFC. thus, that the left example of a higher load or a higher power output or a higher dimming level corresponds to the others. as will be understood, to recognize, and in the further explains thus depends according to the invention, the frequency deviation of de m nominal value for the sound era. The nominal value is determined by the control algorithm of the PFC and corresponds to the four examples 300, 200, 100 and 250ns. The nominal value is determined by the control algorithm of the PFC (the basis of the control loop). Exemplary times of the determination are shown schematically for the individual examples as the time points "calc-event" shown.

The nominal value of the time t on controller is gradually increased ton_step by a step value. From the sum of respective added values step ton_step thus in each case an additional value T on_ADD which the nominal value t on regulator is added and thus the instantaneous value of the duty cycle (on-time) results obtained. can ton_step the step value * thereby be pulled or drawn thereto from the previous instantaneous value of the duty depending on the direction of the current change during the "sweep mode. At low dimming levels and / or at low load, of course, the nominal value is t on regulators for the t on -time of the switch of the PFC reduced, as shown in the three right examples. Therefore, it is reduced at a reduced load and / or reduced t on -time for lower dimming level of the frequency deviation such that the deviation so above / below the nominal value is reduced. The nominal amplitude of the sweep mode, in this case 200ns, which is derived from the frequency deviation is so restricted by the inventive process depends on the load and thus from the nominal duty cycle t on of the switch controller. The difference between the nominal on-time t on controller and the minimum value T min on-determined, this difference forms the half of the respective allowable frequency deviation. Thus, in particular prevents that in the balanced lowering of the sound time (too short) would be switch-on times for the switch reaches impermissible. The minimum value t on-min forms a lower limit for the frequency. The second and fourth example shows that in the modulation by the "sweep mode" partially prevented, that can be "cut off", when the duty t below the critical value on-min (also referred to as Miniraalwert t on-min) falls , In a stepwise change in the duty cycle, as shown in the examples, it is possible that this "cut off" individual stages (also referred to as "clipping") are. The steps would therefore be in the impermissible range are prevented and instead set as long as the on period at the lowest allowable value. Thus, in the second example, the two prescribed by the "Swee mode" stages with t on - ■ 50ns and 0ns cut or prevented, where the duty cycle on the still allowed value t on -. 100 ns remains Once the "sweep mode" prescribed duty within the permissible range, that is about 100ns, rises again, and the actual duty cycle is adjusted accordingly again. Thus, the nominal value is not distorted, the upper peaks of the modulation are adjusted to reflect the lower tips, so cut off, so that the average value is not falsified. In this manner, the frequency shift is set indirectly load. In the Fig. 3 is in this case the change from the first to the second example of the frequency deviation of 400 ns to 200 ns limited (that is, the deviation from the lower limit value t on-min nominal value t on control is of an amplitude of 200 ns to 100 ns reduced).

Determining at what level one cycle of the "sweep" mode to be cut off can take place at the beginning of the cycle of the "sweep" mode or when the current nominal value of the duty ton_Regler has been determined.

The determination of the frequency deviation by specifying at least one limit value, wherein the respective permissible frequency deviation may be determined depending on the difference between the current switch-on time ton_Regler and the limit value t on-min, offers the advantage to the alternative example of the use of a look-up table, from the values of the respective frequency deviation or the supplementary values T OU _ ADO can be read that in the simplest case only one limit must be stored in memory and can even be used an indirect adaptation to the current load.

With particularly low load, as shown in the third example, even the frequency deviation can be entirely prevented. However, due to the correspondingly reduced power, the EMC load is low, provides a limitation no significant restriction on the electromagnetic compatibility. In very low dimming levels and thus very low t on -time (nominal value) so can the stroke up be reduced to zero, that in certain dimming levels or low loads the "sweep" mode can be canceled. thus, it can be specified, and the timing of the switch of the power factor correction circuit will not be modulated at reaching this lower threshold a lower threshold of the load . This lower threshold may be set for example as Dimmpegel- or load value, or also as a value for the on-time t on. as mentioned above, lies with the invention, a cyclic change in frequency or tone _ time variation occurs when supply voltage and load are constant. Especially then the "sweep" mode with a full modulation to choose due to the higher power in order to reduce the EMC load of the PFC. This is represented by the left (ie, first) example.

It may be predetermined in the control unit of the PFC as the lower limit for the frequency is a minimum value on T-min, this is located in Figure 3 at 100 ns. Thus, the control unit can determine without knowledge may present Dirarapegel or loads based on the detected value by the control algorithm for t on and the resulting difference to the minimum value t min on-the allowable frequency deviation.

However, it is also conceivable that when the nominal value of sound for a predetermined Miniraalwert, for example, 250ns, reached which is subjected to "sweep mode" This would mean that only in the first example, an unchanged "Sweep" mode would be used. while the "sweep mode" is exposed in the other.

The timing of the switch of the power factor correction circuit is modulated at an input-application of a DC voltage, this modulation may have a frequency deviation. This can be defined by limits. The frequency deviation of the modulated timing of the switch of the power factor correction circuit can be set depending on the load by changing the lower and / or upper limit value.

Thus, according to the invention is basically a modulated timing of the switch of the power factor correction circuit in an input-application of a DC voltage, this modulation may have a frequency deviation. The frequency of the modulated timing of the switch of the power factor correction circuit can be set directly or indirectly depending on the load. The frequency can be referred to as modulation, it features the possible frequency range between lowest and highest frequency. It should be noted, that can also change the time of the switch due to the control loop or a andersweitigen preset by the control circuit in a power factor correction circuit and thus the frequency is changed as a dependent variable of the switch. In principle can be of the "sweep" mode also be achieved that modulation of the return signal is performed (actual value signal for the output voltage), so that then due to this distortion * of the PFC controller modulation of t will take on -time with trying to to regulate the varying it deems output voltage constant. When the above solution is chosen, namely, a calculation of the sound-nominal value with subsequent modulation is important to ensure that the modulation is so fast that the controller can not compensate. thus, actually from a constant ton nominal value be assumed with subsequent rapid modulation. Alternatively, the set value for the output voltage are modulated course. in a modulation of the command value or the actual value it should be ensured that this takes place in a frequency range that the control algorithm can compensate.

It can be set or changed, other parameters of the "sweep" mode, for example, the rate of change of modulation of the on-time (ie, the change of the extension values), whereby the frequency of the passage of a cycle of the "sweep Moduss" (the modulation frequency) can be adjusted can.

It should be noted that the inventive method for use in operating devices for lamps other than those described in the examples electronic ballasts (EVG) for gas discharge lamps in operating devices for inorganic and organic light emitting diodes (LED) is applicable.

Claims

claims
Method for operating an operating device for loads in the form of bulbs, in particular an electronic ballast (EVG) for
Gas discharge lamps, wherein the operating device has an active clocked by a switch power factor correction circuit (PFC) for reducing harmonics in the input current consumption, wherein
the timing of the switch of the power factor correction circuit is modulated at an input-application of a DC voltage, and
- the frequency shift of this modulation is load dependent. The method of claim 1,
wherein the frequency shift depends on the wattage of the connected lamps and / or the current dimming level. The method of claim 1 or 2,
wherein the output voltage of the PFC is controlled, and the modulation of the frequency by one or more of the following steps takes place:
- modulating a target value of output voltage,
- applying a modulation to a directly or indirectly detected actual value of the output voltage, and / or
- modulating the control value of the control. Method according to one of the preceding claims, wherein the on period t on of the switch is preferably stepwise modulated. Method according to one of the preceding claims, characterized in that
that upon reaching a preset lower threshold of the load, the timing of the switch of the power factor correction circuit is no longer modulated. Method according to one of the preceding claims, characterized in that
that first and accordingly a certain Sollbusspannung at the output of the PFC is set a nominal value for the on period of the switch is calculated, and then carried out the modulation of the timing of the switch of the power factor correction circuit. Method according to one of the preceding claims, characterized in that
that upon reaching a predetermined upper threshold of the load, the timing of the switch of the power factor correction circuit normal, that is modulated without a limitation. Method according to one of the preceding claims, characterized in that
that the modulation frequency of the power factor correction circuit (PFC) is selected such that adjusts the output voltage of the power factor correction circuit (PFC), a not been regulated ripple. The method of claim 8,
characterized,
that the ripple of the output voltage for keeping constant the power of the lamps is compensated for in a following lamps loop.
10. The method of claim 9,
characterized,
that the illuminant-locked loop compensates the ripple of the output voltage supplied by varying the operating frequency of the lamps. 11. The method according to any one of the preceding claims, characterized in that
that the frequency deviation of the power factor correction circuit (PFC) depending on the difference between the current nominal value of the switch-on time (t on controller) and a lower limit value (t on-min) is selected.
12. The method according to any one of claims 1 to 10,
characterized,
that modulation of the power factor
Correction circuit (PFC) by means of a timer circuit, are read out by means of the values ​​from a look-up table. 13. The method according to any one of the preceding claims, characterized in that
that is automatically switched to the modulation of the timing of the switch of the power factor correction circuit as soon as the application of a DC voltage is detected by the operating unit.
14. A method according to any one of the preceding claims, characterized in that
that the power factor correction circuit (PFC) is operated in the so-called boundary mode.
15. Coraputersoftware program product,
characterized,
that it supports a method according to any one of the preceding claims when run on a computing device in an operating device or implemented by hard wiring. 16, control block for a Leuchtraittel operating device, in particular an integrated circuit such as, ASIC, microcontroller or hybrid version thereof,
characterized,
that it is designed to support a method according to any one of claims 1 to 14.
17. Operating device for loads in the form of bulbs, in particular electronic ballast (EVG) for gas discharge lamps, wherein the operating device a power factor correction circuit (PFC) for
comprising reduction of harmonics in the input current consumption,
characterized,
that the operating frequency of the power factor correction circuit is modulated at eingangsseitigera concerns a DC voltage between two limits the timing so that the limits comprise a frequency deviation, and
- the frequency deviation by changing the lower and / or upper limit value is set depending on the load .. 8. Operating device according to claim 17,
characterized,
that the modulation frequency of the power factor correction circuit PFC {) is selected such that (in the output voltage of the power factor correction circuit PFC) adjusts a deraentsprechende ripple. 19. Control unit according to claim 18,
characterized,
that the afflicted with the ripple output voltage is supplied to an illuminant-control loop, which varies for keeping constant the power of the Leuchtraittel the operating frequency of the lamps.
20. Operating device according to one of claims 17 to 19, characterized in
that the modulation frequency of the power factor correction circuit (PFC) is selected in a range between 50 Hz and 500 Hz, preferably 90 Hz to 400 Hz.
21. Operating device according to one of claims 17 to 20, characterized in
that modulation of the power factor
Correction circuit (PFC) by means of a Tiraerschaltung be read out by means of values ​​from a look-up table. 22. Control unit according to claim 20,
characterized,
that it is designed for the automatic activation of the modulation by means of the timer circuit and look-up table upon application of a DC voltage.
23. Operating device according to one of claims 17 to 22, characterized in that
that the power factor correction circuit (PFC) is designed for boundary mode operation.
PCT/EP2011/063754 2010-08-10 2011-08-10 Modulation of a pfc during dc operation WO2012020047A1 (en)

Priority Applications (2)

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DE201010039154 DE102010039154A1 (en) 2010-08-10 2010-08-10 Modulation of a PFC in DC mode
DE102010039154.9 2010-08-10

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EP20110749142 EP2604097B1 (en) 2010-08-10 2011-08-10 Modulation of a pfc during dc operation

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DE102012206976B4 (en) 2012-04-26 2014-09-25 Osram Gmbh Switching converter for operating at least one LED
DE102013107872B3 (en) * 2013-08-07 2014-12-11 Vossloh-Schwabe Deutschland Gmbh Apparatus and method for operating a lighting means arrangement
DE102015223589A1 (en) * 2015-11-27 2017-06-01 Tridonic Gmbh & Co Kg Switching converter with cyclic frequency change
DE102016107578A1 (en) * 2016-04-25 2017-10-26 Vossloh-Schwabe Deutschland Gmbh Operating circuit and method for operating at least one luminous means,

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EP0490329A1 (en) 1990-12-07 1992-06-17 Tridonic Bauelemente GmbH System for controlling the light intensity and the behaviour of gas discharge lamps
WO1999034647A1 (en) 1997-12-23 1999-07-08 Tridonic Bauelemente Gmbh Method and device for detecting the rectification effect occurring in a gas-discharge lamp
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WO2006042640A2 (en) 2004-10-20 2006-04-27 Tridonicatco Gmbh & Co. Kg Modulation of a pfc during dc operation

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US4683529A (en) * 1986-11-12 1987-07-28 Zytec Corporation Switching power supply with automatic power factor correction
EP0490329A1 (en) 1990-12-07 1992-06-17 Tridonic Bauelemente GmbH System for controlling the light intensity and the behaviour of gas discharge lamps
EP0490329B1 (en) 1990-12-07 1996-04-17 Tridonic Bauelemente GmbH System for controlling the light intensity and the behaviour of gas discharge lamps
WO1999034647A1 (en) 1997-12-23 1999-07-08 Tridonic Bauelemente Gmbh Method and device for detecting the rectification effect occurring in a gas-discharge lamp
DE10128588A1 (en) 2000-09-15 2002-03-28 Tridonic Bauelemente Gmbh Dorn Electronic ballast with DC control
US20040047166A1 (en) * 2002-01-25 2004-03-11 Precor Incorporated Power supply controller for exercise equipment drive motor
WO2006042640A2 (en) 2004-10-20 2006-04-27 Tridonicatco Gmbh & Co. Kg Modulation of a pfc during dc operation

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EP2604097B1 (en) 2016-01-13 grant
DE102010039154A1 (en) 2012-02-16 application

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