SU1239804A1 - A.c.voltage-to-d.c.voltage converter - Google Patents

Abstract

The invention relates to electrical engineering and can be used in secondary power sources. The purpose of the invention is to expand the functionality. The converter contains a bridge rectifier and c chains connected between one rectifier output and one output output. Each chain consists of a series-connected key and choke, as well as a diode. The cathode of the diode is connected to a common point of connection between the key and the choke. The anode of the diode and the other output of the rectifier form a common conclusion. Key management signals are generated by a pulse driver, a counter, and a decoder. The converter provides a voltage-free decrease in voltage any required number of times through the use of Y specified chains and a specific key management algorithm. 2 Il. с о (Л 1ЧЭ оо со 00

Description

The invention relates to electrical engineering, automation, radio engineering and can be used in secondary power sources.

The aim of the invention is to expand the functional capabilities of the device.

Figure 1 shows an electrical circuit for converting an alternating voltage to a constant; figure 2 - diagram of the shape of the body of pulses.

The Converter (figure 1) contains diodes 1-1-1-4, keys 2-1-2 p, capacitor 3, chokes 4-1-4-p, switching diodes 5-1-5-p, driver 6 pulses, the counter 7, the decoder 8. The pulse shaper 6 (FIG. 2) consists of a current limiting resistor 9 connected to the terminal 10, connected to the delay element 11. As an element of galvanic isolation, an opto-switch-type inverter type 249L111 can be used. The keys 2 can be made on thyristors with isolation transformers in the control circuit or on transistors.

Diodes 1-1-1-4 combined into two groups. The common junction point of the diodes of each group is connected to one of the input pins for connecting a single-phase AC source. The anodes of diodes 1-1 and 1-3 are combined and their common junction point forms the first of the output pins. The cathodes of diodes 1-2 and 1-4 are combined and connected to the inputs of all keys 2-1-2-p. Capacitor 3 is connected between the output pins. The outputs of the keys 2-1-2-p through the corresponding inductors 4-1-4-p connected to the second output terminal. The anodes of all commutating diodes 5-1-5-p are connected to the first output pin, and their cathodes are connected to the outputs of the corresponding keys 2-1-2-p. The input of the pulse generator 6 is connected to the cathodes of diodes 1-2, 1-4, and the output to the input of the counter 7. The outputs of the counter 7 are connected to the corresponding inputs of the decoder 8, each of the outputs of which is connected to the control input of the corresponding switch 2-1-2- P.

The Converter operates as follows.

A rectifier consisting of diodes 1-1-1-4 rectifies input change 2398042

The voltage is applied, and its output voltage has the same shape as the Hertz circuit. The current that is the function of this voltage flows

, across the current-limiting resistor 9 and along the input circuit of the galvanically isolated element 10, it generates a pulse at its output, which through the element 11 for the hanger goes to

10 is the input of the counter 7. The delay time of the element 11 is chosen so that the switching of the counter 7 takes place during the fall of the half-wave of the rectified voltage to zero. In this way,

15, the opening and closing of the keys occurs during the absence of voltage at their inputs, thus eliminating the dynamic losses on the keys during the switching. Counter 7

The -JQ and decoder 8 are a pulse distributor that has a signal at any time only at one of the outputs. Distributor commutes each

25 to the half-wave of the rectified voltage with the help of the keys 2. The inductance value of the chokes 4 is chosen so that the amount of electricity stored in them is sufficient for

2 voltage failure compensation. Each choke 4 and capacitor 3 form an integrating circuit, which separates the constant component 35

40

as well as half-waves of rectified voltage in each parallel circuit flow n times less, the constant component will be n times less than in known devices. properties. Thus, a transformer-free voltage drop occurs, which decreases as many times as the parallel circuits of keys 2 and chokes 4 are used.

45

Claims (1)

Invention Formula 50 AC to DC converter containing an input connected to input terminals for connecting a source of supply voltage to a bridge rectifier, the common output of the anode valve group of which forms a negative output terminal, two linear droplets, connected by one 55 ends to an upholstered point forming positive an output pin, and a capacitor connected between the output pins, distinguishing 31 in order to expand the functionality, it additionally introduced (p-2) linear chokes, one ends of which are connected to the specified common connection point of the main chokes, controlled keys, each of which is connected between the common output of the cathode rectifier valve group Mitel and the free end of the corresponding Drossel, And shunt diodes, each of which is connected by an anode with a positive output terminal, and 3980A4 with a common point of connection of one of the keys and the corresponding throttle, as well as a control unit consisting of 5 connected shaper and pulse distributor in series, the input of the shaper 11pulses connected to the common outlet of the cathode group of the distributor valves, and each of the distributor outputs The pulses are connected to the control output of one of the control keys. H d / ioKij 7 Editor R. Tsitsika Compiled by A. Kirillov Tehred M. Khodan -gch Order 3405/54 Edition 631 Subscription VNIIPI State Committee-USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Proofreader T. Kolb