The method of controlling electric power of a discharge lamp and a device for its implementation

 

(57) Abstract:

The invention relates to electrical engineering and can be used to power a gas-discharge devices and, in particular, gas-discharge lamps. The technical result is the ability to regulate electric power gas-discharge lamps. The method of control is to regulate the durations of alternating open and closed state of the power managed key referred to the length of each of the conditions set by the integration time is the sum of three signals: the first signal from the sensor, the current value of the power key, the second signal from the sensor voltage power source and the third constant signal equal with opposite sign to the average over a switching period of the power key the value of the sum of the first and second signals coming from the signal source offset that specifies power consumption from the power source, and to all three signals can be added correction signals. The method can be carried out by a device containing the sensor current value of the power key, the sensor voltage power source, the signal source offset, driver, power driven wrench, to agree the resources and the integrating unit and the comparator with hysteresis switching, and to the inputs of the summing and integrating unit connected to the outputs of the sensor current value of the power key, the sensor voltage power source and an offset signal, and the output connected to the input of the comparator hysterisis switch, the output of which is connected to the input of the driver Manager power managed key. 2 C. p. F.-ly 3 Il.

The invention relates to electrical engineering and can be used to power a gas-discharge devices and, in particular, gas-discharge lamps.

A known method of regulating the power supply for discharge lamps and realizing it device [RF Patent N 2101886, IPC H 05 B 41/29, publ. in bull. N 1/98] , in which the control power key is depending on the amount of current supply voltage at the storage capacitor and managed key, and stabilizing power of a discharge lamp by changing the current of the current of the lamp due to the narrowing of the average (most effective) time zone within the period of the voltage variation.

The disadvantage of this method is the requirement of a sufficiently strong voltage power source (for example, the rectified mains voltage high waist color noble> Closest to the invention to the technical nature and adopted for the prototype is a way to regulate the power supply for discharge lamps [U.S. Patent N 4230971, IPC H 05 B 41/39, publ. 28.10.80], which consists in the fact that when feeding a discharge lamp bipolar electric pulses, the duration of the open state of the power key is applied to the lamp voltage of one polarity is determined by the time the current in the power circuit a key element of a given magnitude and duration of the closed state of the power key is applied to the lamp current of the opposite polarity) is enforced.

The disadvantage of the prototype is the dependence of the average electric power of the discharge lamp from a supply voltage and the resistance of the discharge lamp.

The technical result of the invention is the regulation of the electric power of the discharge lamp.

The technical result is achieved in that the control method, which consists in regulating the duration of the alternating open and closed States of the power managed key referred to the length of each of the conditions set by the integration time hundreds sensor voltage power source, and the third signal equal with opposite sign to the average for the period of the switching power managed key value of the sum of the first and second signals from the signal source offset and specifies the power consumed from the power source, and to all three signals can be added correction signals.

This method can be implemented on the device containing the sensor current value of the power-managed key sensor voltage power source, the signal source offset, driver, power driven key, the matching element is connected in series with power controlled by the key, which is further provided with summarizing and integrating unit and the comparator with hysteresis switching, and to the inputs of summing and integrating unit connected to the outputs of the sensor current value of the power-managed key sensor voltage power source and an offset signal, and the output connected to the input of the comparator with switching hysteresis, the output of which is connected to the input of the driver, Manager power managed key.

The invention consists in regulating the average electric power Gaza power driven key. For example, consider the case of linear dependence of the sensor signal values of the source voltage from the source voltage VFEand sensor signal residual current power managed key from the current IFEpower managed key. Let us denote: <I FE> is the average for the period current power managed key with equal accuracy to the average losses for the period current drawn from the power source. VCMsignal from the signal source offset that specifies the average electric power

gas-discharge lamps, < VQ> is the average for the period is an additional correction signal. Then:

(k11+k12<I FE>)+(k21+k22VFE)=VCM+< VCOOR>

where (k11+k12<I FE>) is the signal from the sensor current value of the power-managed key (k21+k22VFE- the signal from the sensor voltage power source, k11, k12, k21, k22- constant coefficients.

For simplicity of analysis, assume that the average for the period value of < VQ> is equal to zero. Given that accurate to power loss on the elements of the device

= <I and = k22/k12get:

= VFE-V2ANDP< / BR>
This shows that the average for the period of the pulse power is transmitted to the gas discharge lamp is not dependent on the electrical parameters of the latter.

Let us denote: VFEMR.= /2 is the rated voltage of power source <P MAX> =2/4 - maximum (within a certain range of VFE) average power consumed by the discharge lamp, = (VFE- VFEMR.)/VFEMR.the relative deviation of the supply voltage from the nominal value. Then get:

/<P MAX> = (1-2)

In Fig. 1 illustrates the above dependence

/<P MAX> VFE/VFEMR.where you can see that the average for the period of the pulse maximum power at rated voltage, weakly decreases when the deviation of VFEin any direction from the nominal value in a certain range of VFEand rather strongly decreases when the deviation of VFEin any direction outside of this range.

In Fig. 2 presents experimental data on atosimoti

(shaded circles) consumed by the device from the power source received on the device to realize the inventive method and performed accordingly fundamentally-structural diagram shown in Fig. 3. As a matching network was applied energy-accumulating transformer.

A device that implements this method contains the sensor 1 current value of the power-managed key sensor 2 voltage power source 3 an offset signal, the driver 4, the power managed key 5, the matching element 6, is enabled by the input in series with the power managed key 5 and the output of the discharge lamp 9, summarizing and integrating unit 7 consisting, for example, of the transistor and the capacitor, a comparator with hysteresis switch 8, for example, a Schmitt trigger.

The device operates as follows. Summarizing and integrating unit 7 generates an output signal proportional to the integral of the sum of the signals from the sensor 1 current value of the power-managed key from the sensor 2 voltage supply from source 3 signal offset. Each time after reaching the output signal from the summing and integrating unit 7 one evoprene state power managed key 5.

By the beginning of the next period, the voltage at the output of summing and integrating unit 7 reaches one of the thresholds of the switching comparator 8 with hysteresis switch that switches power managed key 5 in the open state. When this occurs, a current power managed key 5, which leads to a change of sign of the direction of change in the voltage at the output of summing and integrating unit 7. This process takes place during the "active" part of T1period T until the time when the voltage at the output of summing and integrating unit 7 reaches the second switching threshold of the comparator 8 with the switching hysteresis. This leads to power off the managed key 5. Current power managed key stops, which leads to a change of sign of the change of the voltage at the output of summing and integrating unit 7. This process continues during the "passive" part of T2period T until the time when the voltage at the input summing and integrating unit 7 again reaches the first switching threshold of the comparator 8 with the switching hysteresis. The process is periodically repeated with period T = T1+T2.

1. The way UPRAVLENIE States power managed key characterized in that the said duration of each of the conditions set by the integration time is the sum of three signals: the first signal from the sensor current value of the power of the managed key of the second signal from the sensor voltage power source, and a third signal equal with opposite sign to the average for the period of the switching power managed key value of the sum of the first and second signals from the signal source offset and specifies the power consumed from the power source.

2. A device for implementing the method according to p. 1 containing the sensor current value of the power-managed key sensor voltage power source, the signal source offset, driver, power driven key, the matching element is connected in series with the power driven wrench, characterized in that it further provided with summarizing and integrating unit and the comparator with hysteresis switching, and to the inputs of summing and integrating unit connected to the outputs of the sensor current value of the power key, the sensor voltage power source and an offset signal, and the output connected to the input of the comparator with hysteresis switching, you

 

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