Patent UA-64832-C2 (UA)
Title: High-voltage regulated direct-voltage source with two different-polarity outputs
IPC: H02M3/335
Filed: 2001-07-26
Abstract: The proposed high-voltage regulated direct-voltage source with two different-polarity outputs can be used, as a secondary power-supply source, in different devices, specifically in mass spectrometers, in which generation of positive or negative ion flux is required. The direct-voltage source contains two transistor switches, two comparators with pulse-width modulation of the output signal, a triangle pulse generator, an error signal amplifier, a feedback circuit, a high-voltage transformer, a voltage multiplier, a current transducer, a comparator-based protection unit, two blocking diodes, a switching unit, and additionally, an inverting amplifier, a reference voltage source, an additional switching unit, a polarized relay, four voltage relays, a unit for setting the operation threshold of the protection unit, and an additional blocking diode. The output of the inverting amplifier is connected to the input of the error signal amplifier and the first normally closed contact of the polarized relay, and the output is connected to the first normally open contact of the polarized relay. The first switching contact of the polarized relay is connected to the cathode of the blocking diode at the output of the error signal amplifier. The negative terminal of the reference voltage source is connected to the second normally closed of the polarized relay, and positive terminal is connected to the second normally open contact of the polarized relay. The second switching contact of the polarized relay is connected to the output of the voltage divider. The input of the voltage divider is connected via a filter to two normally open contacts of the first and the second voltage relays. The switching contacts of the first and the second voltage relays are connected to the corresponding separate outputs of the voltage multiplier. Two outputs of the voltage multiplier are connected to the normally open contacts of the third and the fourth voltage relays. The switching contacts of the third and the fourth voltage relays are connected to the terminals of the primary winding of the transformer. The switching unit is based on a circuit with four diode-transistor optoelectronic couplers. The first and the second outputs of the first switching unit are connected via the coils of the first and the second voltage relays to the positive power-supply terminal and the common terminal of the direct-voltage source circuit. The third and the fourth outputs of the first switching unit are connected via in-series connected coils of the third and the fourth voltage relays to the positive power-supply terminal and the common terminal of the direct-voltage source circuit. The common input of the additional switching unit is connected to the output of the first switching unit, and the remaining four inputs are connected to the corresponding outputs of the additional switching unit. The unit for setting the operation threshold of the protection unit is connected to the positive power-supply terminal and the common terminal of the direct-voltage source circuit. The output of the unit for setting the operation threshold of the protection unit is connected to the noninverting input of the comparator of the protection unit. The inverting input of the comparator is connected to the output of the current transducer, and the output is connected to the inverting input of the error signal amplifier. The proposed device provides two output voltages and switching these voltages by a computer.