SU1288842A1 - D.c.voltage-to-d.c.voltage converter with voltage multiplication - Google Patents

Abstract

The invention relates to the field of electrical engineering and can be used as a secondary source of power for electronic devices. The purpose of the invention is to increase efficiency and reliability. . The converter contains a voltage multiplier between the DC supply circuit and the load circuit, a unit for switching off 5 + o / l: -W discharge multiplexer thyristors (TDRT), an output capacitor connected between the output terminals. The TDCU consists of a thyristor 10, a capacitor 11, diodes 14, 15, and controlled key elements 12,16. The DBRTU is connected between the input 1.2 and output 4 pins of the converter. The common point of the controlled key elements 16, 12 through the capacitor 11 and the common point of the cathode of the diode 14 and the cathode of the thyristor 10 is connected to the bus 9 of the voltage multiplier. Introduction BDVRTU provides guaranteed off thyristors at any load, up to idling. At the same time, the energy to turn off the thyristor 10, which is determined by the voltage across the capacitor 1I, is small. This eliminates the loss of energy - when working on low-power, low-current loads and the possibility of failure in the work of the converter. 7 / J -о + Ш (/) ГУ -О fC fS х

Description

The invention relates to electrical engineering and converter technology. It can also be used as a secondary source of power for electronic devices if it is necessary to convert low DC to high voltage.

The purpose of the invention is to increase the efficiency and reliability of voltage converters by eliminating energy loss when working on low-power, low-current loads and the possibility of converter failure.

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The drawing is an electrical converter circuit.

The converter contains input and 2 and output 3 and 4 outputs. A multiplier 8 is connected to them via input 5 and 6 and output 20 7 buses. Its second output bus 9 is connected to a common connection point of the thyristor 10 and a capacitor 11. The thyristor 10 is connected between the output terminal 4 and the bus 9. It is connected to the common connection point of the thyristor 10 and output 4 of the first controllable key element 12. the second terminal is connected to the capacitor 11. AOR The key element 12 has a control electrode 13. The first diode 14 is connected by an anode with a positive input terminal 1, and the cathode with a common connection point of a condenser 1 1 and a thyristor 10. The second diode 15 is connected via a cathode with a negative input terminal 2, and the anode with one of the terminals of the second controlled key element 16. Its second terminal is connected to the common point of connection of capacitor II and key element 12. Key element 16 has a control electrode 17. Parallel to the output terminals 3 and 4, an additional terminal 45 is connected to the capacitor 18. The diodes 14 and 15, the capacitor 11, the thyristor 10 and the controllable key elements 12 and 16 form a unit for switching off the thyristors. The voltage multiplier 8 has 50 control inputs 19 and 20.

For simplicity, the circuit does not show a rectifier that supplies input voltage to pins 1 and 2, a load that connects to outputs 3 and 4 55 and a control unit that controls signals from a voltage multiplier 8, thyristor 10, key elements 12 and 16.

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The Converter operates as follows.

In the initial state, the storage capacitors in the multiplier 8 and the capacitors 11 and 18 are discharged. All keys and thyristors are closed.

By the signal supplied from the control unit to the input 19, the semiconductor elements in the multiplier 8 are opened and the storage capacitors through terminals 1 and 2 are parallelly charged from the transmitter. At the same time, the key element 16 is opened by a signal to the control electrode 17 and a capacitor 11 is charged from the same rectifier via diodes 14 and 15. During charging, the thyristors in the multiplier 8 connect the storage capacitors to the series circuit, the thyristor 10 and the key element 12 are closed.

After reaching the required level of voltage on the storage capacitors in the multiplier 8 and the capacitor 11, the key element 16 and the semiconductor elements in the multiplier 8 are closed.

The signal supplied from the control unit to the input 20 of the multiplier 8 and the control electrode of the thyristor 10, the storage capacitors are connected in series, the capacitor 18 is charged and the operation is on

load converter. I

To force the thyristors to be closed in the multiplier 8 by a signal from the control unit to the electrode 13, the key element 12 is opened. The voltage on the capacitor 11 is applied to the thyristor cathode plus and minus to the thyristor anode 10 and is turned off. The duration of the control pulse on the key 12 is selected 20-30% longer than the closing time of the thyristor 10 in order to ensure its guaranteed closure (100 µs).

After the termination of the control pulse, the key element 12 is closed, the current through the load and the capacitor 18 is interrupted, and the thyristors in the multiplier 8 connecting the storage capacitors 8 into a series circuit are turned off.

Now the storage capacitors in the multiplier 8 and the capacitor 11 are recharged from the rectifier via pins 1 and 2. At this time, the load is fed through pins 3 and 4 from the capacitor 18. Then the charge is restored and the cycle repeats.

Since during the discharge, the summed high voltage on the capacitor 8 differs only by the magnitude of the voltage drop on the open. thyristors in multiplier 8 and thyristor 10, i.e. about several tens of volts, then for reliable closing of the thyristor 10, the voltage on the capacitor 11 can be about the same value that determines the duration of the open state of the key element 16.

After closing the thyristor 10 and the key element 12, the voltage on the thyristor 10 is not more than 100 V, which virtually any thyristor reliably holds.

Therefore, turning off the thyristors in multiplier 8 is guaranteed for any load - large or small - up to idling.

The energy to turn off the thyristor 10 is determined by the voltage across the capacitor I J and therefore is small.

In the proposed device, energy losses are excluded when working on low-power, low-current loads and the possibility of transmitter malfunctioning, which significantly increases its efficiency and reliability.

Claims (1)

Invention Formula DC to DC converter with multiplication Editor S.Patruscheva Order 7820/54 Compiled by L. Ustinkina Tehred L. Serdyukova Corrector Circulation 683 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 -. Production and printing company, Uzhgorod, Projecto st., 4 five 0 five 0 five voltage, containing positive and negative input and output BbiBOfifci for connecting a constant voltage source and a load, respectively, and connected between a constant voltage source circuit and a load circuit, a voltage multiplier including storage capacitors that are connected to the input terminals in parallel through semiconductor elements source of constant voltage, and through discharge thyristors - consistently with the purpose of the load, characterized in that, in order to increase efficiency and hope a capacitor connected between the output pins and a unit for switching off the thyristor discharge, including two diodes, a circuit from a sequentially connected capacitor and the first controlled key element, shunted by the thyristor, connected between one of the multiplier outputs and the output terminal unipolar with it, and the second controlled key element, with the first diode anode connected to the positive input output and the ka to the common connection point of the indicated thyristor and capacitor, the second diode is connected to the negative input terminal by the cathode, and the anode through the second controlled key element to the common connection point of the indicated capacitor and the first controlled element. Proofreader SsShekmar