RU81607U1 - SINGLE-STAGE DC CONVERTER - Google Patents

Abstract

The utility model relates to the field of electrical engineering and can be used in the design of power sources of electronic equipment. Technical essence: transistor 1 and winding compensating 5 and accumulative 6 inductors are connected between the first input and first output terminals. The first output terminal is connected through a capacitor 7 to the second input and output terminals. The windings 3 and 4 of the compensating inductor 5 are made in the form of an open loop of wire located in the hole of an annular or cylindrical magnetic circuit with a rectangular hysteresis loop. The center of the loop is connected through a recovery diode 8 with a second input terminal. The use of a nonlinear compensating inductor 5 with a rectangular magnetization reversal characteristic eliminates the occurrence of through currents through the transistor 1 and the recovery diode 8 when switching the circuit at high frequency. The implementation of a single-turn throttle design allows you to simplify the design and implement this process with minimal dynamic losses. The technical result is to increase the efficiency of the circuit, improve efficiency and simplify the design. 1 n.p. f-ly, 2 ill.

Description

The utility model relates to the field of electrical engineering and can be used in the design of power sources of electronic equipment.

The device closest to the utility model is a voltage regulator made in the form of a one-act DC-DC converter (1). The converter contains a control transistor, a storage linear choke, a recovery diode and a capacitor connected to the output terminals. To protect against through currents between the recovery diode and the transistor, a compensating linear choke is included. At low frequencies (of the order of 10–20 kHz), the circuit operates stably and has a rather high efficiency. However, when switching to high (about 200-300 kHz) frequencies, the linear inductor does not have time to return the energy stored by it to the load, which makes it almost impossible to fulfill the function assigned to it to eliminate through currents. The decrease in the efficiency of the circuit (in the framework of eliminating through currents) at high frequencies leads to a decrease in efficiency. In addition, the design of a multi-turn compensating choke differs in complexity and low manufacturability.

The technical result that can be achieved using the utility model is to increase the efficiency of the device when operating at high frequencies and to improve the manufacturability of its design by simplifying the design.

The technical result is achieved due to the fact that in a single-cycle DC-voltage converter containing a transistor, the control circuit of which is connected to the control unit (1), the power circuit of the transistor, together with series-connected windings of the compensation and storage chokes, is connected between the first input and first output terminals, in parallel the output terminals include a storage capacitor, and the windings of the compensating inductor are made in the form of an open loop from a wire located in ERSTU cylindrical or annular magnetic core with a rectangular hysteresis loop, and loop center being united ends of the windings, is connected via a diode to the recovered connected between a second input and second output terminals.

Figure 1 presents the electrical circuit of the device.

Figure 2 shows the design of a compensating choke.

The device (Fig. 1) contains a transistor 1 (controlled key), the control circuit of which is connected to the control unit 2. The power circuit of the transistor 1, connected in series with the windings 3 and 4 of compensating 5 and accumulative 6 chokes, is connected between the first input and first output terminals . A storage capacitor 7 is connected in parallel with the output terminals. Counter-connected windings 3 and 4 of the compensating inductor 5 are made in the form of an open loop of wire (Figure 2), located in the hole of an annular or cylindrical magnetic circuit with a rectangular hysteresis loop. The center of the loop, which is the combined ends of the windings of the compensating inductor 5, is connected through a recovery diode 8 to the second input terminal.

The device operates as follows.

When the circuit is connected to a constant voltage source and a trigger signal is supplied from the control unit 2, transistor 1 opens and the current flowing through its power circuit, compensating inductor 5 and linear storage inductor 6 enters the load, charging capacitor 7. Due to the fact that the windings compensating inductor 5 are connected counterclockwise, its inductance is zero and does not affect the energy storage processes in inductor 6.

Upon reaching a predetermined upper threshold for the voltage across the capacitor 7, the control circuit 2 gives a signal to lock the transistor 1. The transistor 1 closes, and the current through the inductor 6, without changing its direction, begins to flow through the recovery diode 8 and the winding 4 of the inductor 5. Magnetic circuit of the inductor 5 magnetized to + Bs. The capacitor 7 and the inductor 6 begin to transfer their energy to the load, and when the specified lower threshold is reached on the capacitor 7, the control circuit 2 gives a signal to switch (unlock) the transistor 1. On the recovery interval of the inverse resistance of diode 8 (about 20-100 nsec.) the current flows through the key 1, the winding 3 of the inductor 5 and the diode 8. The magnetic circuit of the inductor 5 is reversed from + Bs to -Bs, which determines the delay interval that eliminates the through current. Next, the processes are repeated.

To simplify the design and improve the manufacturability of its manufacture, the inductor 5 is expediently made single-turn in the form of an open loop of wire connecting the key 1 with the inductor 6 (Fig 2). The choice of the shape of the magnetic circuit of the inductor 5 (ring or cylindrical) is determined by the resorption time of the recovery diode 8.

The material of the magnetic circuit of the inductor 5 may be ordinary ferrite MN 2000-4000 or PPG.

Thus, the use of a nonlinear compensating inductor with a rectangular magnetization reversal characteristic eliminates the occurrence of through currents through the transistor and a recovery diode when switching the circuit at high frequency, and the implementation of a single-turn compensating inductor allows to simplify its design and implement this process with minimal dynamic losses, which generally increases the efficiency schemes and efficiency.

High efficiency and sufficient reliability of the circuit allow us to recommend this utility model in the design of power supplies for electronic equipment of general purpose.

Compiled by: Khandogin V.I.

Sources of information taken into account when compiling the description:

A.I. Ivanov-Tsyganov, V.I. Khandogin “Sources of secondary power supply for microwave devices” M., Radio and communications, 1989, p.108.

Claims (1)

A single-ended DC-voltage converter containing a transistor, the control circuit of which is connected to the control unit, while the power circuit of the transistor, together with series-connected windings of the compensating and storage chokes, is connected between the first input and first output terminals, a storage capacitor is connected in parallel with the output terminals, and the windings of the compensating choke made in the form of an open loop from a wire placed in the hole of an annular or cylindrical magnet a wire with a rectangular hysteresis loop, the center of the loop being the combined ends of the windings connected through a recovery diode to interconnected second input and second output terminals.