SU1399901A1 - Device for power supply of pulsed gas-discharge lamp - Google Patents

Abstract

The invention relates to electrical engineering and m. used, for example, in photometric devices. The purpose of the invention is to increase efficiency and reduce pulsed switching noise. The device contains a controlled voltage regulator 6, a syncrocontact cycle 8, a pulse transformer 9, a delay element 10, an adder 11, a threshold element 12, which specifies gir 13, made in the form of g-ra saw voltage. The use of a controlled high-voltage stabilizer of voltage 6 makes it possible to ensure uniform voltage sharing from the rectifying bridge 2 on high-voltage transistors of the stabilizer of the first-voltage device and the switching element - transistor 5, at any moment of charging the storage capacitor 3, which ensures an increase in the efficiency of the device va and reliable operation of the device when the magnitude of the light voltage varies widely. 1 il. with S (L

Description

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The invention relates to electrical engineering and can be used in devices for powering pulsed gas discharge lamps, in particular in photometric devices.

The aim of the invention is to increase the efficiency and reduce the impulse switching noise.

The drawing shows a schematic diagram of the device.

The device for supplying a pulsed gas discharge lamp contains a step-up transformer 1, the input of which is connected to the outputs for connecting the power supply network and the output to the input of the rectifying bridge 2, a storage capacitor 3 connected to the terminals for connecting the discharge lamp 4 and connected to Sequentially, there is a semiconductor charging element - transistor 5 connected to the output of the rectifying bridge 2 through a high voltage controlled voltage regulator 6 on one side and through an additional resistor 7 on the other. ony. A common ignition unit with a pulse transformer 9 and a time delay element 10, the output of which is connected to one of the inputs of the voltage accumulator 11, are connected to the common bus through the synchronous act 8, and two other inputs of the voltage adder are connected respectively to the outputs of the threshold element 12 and the master oscillator 13, made in the form of a sawtooth voltage generator, and the output of the adder is connected to the control input of the semiconductor charging element 5. The first inputs are connected to each of the plates of the storage capacitor 3 The terminals of the voltage dividers 14 and 15, their output terminals, respectively, are connected to the inverting and non-inverting inputs of the differential amplifier 16, the output of which is connected to the input of the threshold element 12, controlling the input of the high-voltage controlled stabilization

torus 6 voltage and second input

output divider 14 voltage. The second input terminal of the voltage divider 15 is connected to the common bus, and an additional capacitor 17 is connected to the output of the rectifying bridge 2.

The device works as follows.

When supplying the mains voltage at the output of the secondary winding

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5 0 5 Q

five

five

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transformer 1 appears a high voltage applied to the rectifier bridge 2. At the output of the rectifier bridge 2, a rectified full-wave load,. smoothed by the filter capacitor 17, and the rectified voltage can only slightly (by 15-20 V) exceed the voltage on the storage capacitor 3.

Through resistive dividers 14 and 15 connected to the plates of the storage capacitor 3 and to the inputs of the differential amplifier 16, the voltage from the output of the latter goes to the threshold element 12. While the storage capacitor is not charged to a predetermined voltage, the voltage from the output of the differential amplifier 16 below a fixed reference voltage and the threshold element 12 does not operate. In this case, the voltage of the master oscillator 13 is passed through the voltage adder 11 to the base of the transistor 5, which causes the flow of charge current through the transistor 5 and, respectively, through the storage capacitor 3. The voltage from the filter capacitor 17 is supplied to the controlled high-voltage stabilizer 6 tension The stabilized voltage is applied to the first plate of the storage capacitor 3. The control voltage setting the value of the output voltage of the stabilizer 6 comes from the output of the differential amplifier 16. With a fully discharged capacitor 3, the voltage at the output of the differential amplifier 16 is zero. As the storage capacitor charges with a current defined by the generator 13 and the current generator formed by the transistor 5 and resistor 7 in the emitter circuit, the voltage at the output of the differential amplifier 16 increases, which causes an increase in voltage at the output of the stabilizer 6. After a certain time the voltage of the storage capacitor 3 reaches a predetermined value; at the output of the differential amplifier 16, the voltage exceeds the reference voltage applied to the threshold element 12 at the output of the threshold element 12 l is the voltage, closes the transistor 5 and the recharging current to the capacitor 3 is not

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arrives until the storage capacitor is discharged through the gas discharge lamp 4. The use of a controlled high-voltage voltage regulator allows uniform voltage separation from the rectifying bridge 2 to the high-voltage transients of the voltage stabilizer 6 and the switching element - the transistor 5, at any time of the charge of the storage capacitor 3, which ensures an increase in the efficiency of the device and reliable operation of the device when the magnitude of the mains voltage varies widely.

Under a sawtooth voltage of the master oscillator 13, a sawtooth current is supplied to the charge of the capacitor 3, which ensures the formation of a parabolic voltage across the capacitor

A device for powering a pulsed gas discharge lamp can be used. used in instruments for obtaining time stamps, photoregistration, photometry, i.e. where fast charging of the storage capacitor is required with high efficiency, exclusion of impulse noise and obtaining stable light fluxes.

The use of the proposed device makes it possible to exclude the use of external line filters and high-quality, high-speed, expensive AC power stabilizers.

Claims (1)

Invention Formula A device for powering a pulsed gas discharge lamp containing a step-up transformer, the input of which is connected to the leads for connecting the power supply network and the output to the input of the rectifying bridge, a storage capacitor connected to the terminals for connecting the discharge lamp and connected to it sequentially, a semiconductor charging element associated with the output of a rectifying bridge, an ignition unit with a pulse transformer, and a time delay element 5 Q five d 0 ki, the inputs of which are connected to the common bus through a sync contact, the voltage divider, one of the input terminals of which is connected to the first plate of the storage capacitor, the threshold element, the master oscillator, is connected to the control input of the semiconductor charging element, different that, in order to increase efficiency and reduce pulsed commutation interference, it is equipped with a high voltage controlled voltage regulator, an additional capacitor, a differential amplifier, an additional voltage divider In addition, with a voltage adder., an additional resistor, a rear end; the 1g generator is made in the form of a sawtooth voltage generator, and the semiconductor charging element. in the form of a transistor, with an additional capacitor connected to the output of the rectifying bridge, connected to an additional resistor, and the other to the input of a high-voltage controlled voltage regulator, the output of which is connected to the first plate of the accumulator. The capacitor capacitor, the free output of the additional heating resistor is connected to the semiconductor charging element, the inverting input of the differential amplifier is connected to the output of the voltage divider, the output of the differential amplifier, the control input of the high voltage controlled voltage regulator and the input of the threshold element are connected to another input output, the non-inverting input of the differential amplifier is connected to the output terminal of an additional voltage divider, the input terminals of which included between the second electrode of the storage capacitor and the common bus, and three WMOs voltage adder connected respectively to the outputs of the time delay element, and threshold element of the master oscillator, and an output - to the control input of the semiconductor yuischm charging member.