RussianPatents.com

Converting device for induction heating and versions thereof. RU patent 2394400.

FIELD: physics.

SUBSTANCE: converting device has a direct voltage source, first and second filter chokes, first and second controlled rectifiers, a first inductor load, a first capacitor and a first initiating device. The first terminal of the direct voltage source is connected to the first lead of the filter choke, the second lead of which is connected to two connected first leads of the first and second controlled rectifiers. The second lead of the first controlled rectifier is connected to connected first leads of the first inductor load, first capacitor and first initiating device. The second leads of these elements are also connected to each other. The second lead of the second controlled rectifier and second leads of the first inductor load, first capacitor and first initiating device are connected to each other and to the first lead of the second filter choke, the second lead of which is connected to the second terminal of the direct voltage source. Versions of the device are described.

EFFECT: higher output voltage and simplification of the converting device without increasing supply voltage.

5 cl, 5 dwg

IPC classes for russian patent Converting device for induction heating and versions thereof. RU patent 2394400. (RU 2394400):

H05B6/04 - Sources of current

Another patents in same IPC classes:

Multiphase conversion device for induction heating / 2392780
Proposed invention relates to conversion equipment and may be used in installations for induction heating and melting of metal. Main circuit of multiphase double-frequency conversion device comprises source of DC voltage, the first and second filter throttles, and also three circuits, every of which is formed by controlled valve, serially with which one of load-inductor windings is connected, being shunted by capacitor, at the same time the first output of DC voltage source is connected with the first output of the first filter throttle, the second output of which is connected to three first outputs of three controlled valves, at the same time the second outputs of three windings of load inductor shunted by capacitors are connected to each other and joined to the first output of the second filter throttle, the second output of which is connected to the second pole of DC voltage source, at the same time load-inductor is made of three windings, two of which are connected accordingly serially, and all three controlled valves are connected directly relative to polarity of DC voltage source. Each winding of load inductor with shunting capacitor is tuned for high frequency of double-frequency field of loading circuit. Parallel to each winding of load inductor there is a serial circuit connected made of capacitance and inductance, own frequency of which is equal to lower frequency of double frequency field of loading circuit. High-frequency and low-frequency multiphase components of electromagnetic field in loading circuit are formed by means of special logic for control of controlled valves, when each controlled valve is repeatedly connected and disconnected and forms packs of phase-shifted high-frequency pulses.

Power source for induction heating or melting device with use of trimming capacitor / 2363118
Invention relates to electric engineering and can be used as power supply source with rectifier/inverter with induction heating or melting device. Device includes trimming capacitor connected between rectifier output and inverter input, which forms resonance circuit with inducer at inverter operating frequency. Besides, inducer can be formed of active inducer connected to inverter output and passive inducer switched in parallel with resonant trimming capacitor.

One-phased trasnformation device on alternating-alternating current for inductive heating / 2309558
In accordance to the invention, device contains two identical single transformation devices having input and output contacts, while their input contacts are connected to powering supply of alternating voltage, and output contacts are connected to load contours, each one of which is formed by actively inductive inducer-load, bridged by compensating capacitor. Each single transforming device, for example, first one, consists of 4 fully controllable rectifying cells. First two rectifying cells - 1st and 2nd ones are connected to different contacts of alternating voltage power supply, while aforementioned rectifying cells are connected serially in straight direction relatively to positive polarity of, for example, first semi-period of powering alternating voltage, and connected to load contour in such a way, that on their opening voltage of one, for example, positive, polarity is fed onto load contour during each first semi-period of powering alternating voltage to generate first semi-period of low frequency current. Second two of aforementioned fully controllable rectifying cells - 3d and 4th - are also connected to different contacts of alternating voltage power supply, and aforementioned rectifying cells are also connected serially in straight direction relatively to positive polarity of the same first semi-period of powering alternating voltage and connected to load contour in such a way, that on their opening voltage of same, but negative, polarity is fed into loading contour during each first semi-period of powering alternating voltage to generate second semi-period of low frequency current. Second identical single transformation device is connected to powering source of alternating voltage and to first device in such a way, that during each second, i.e. negative semi-period of powering alternating voltage, voltage of positive and negative polarities is fed onto its load contour to generate semi-periods of low frequency current of different polarity.

Converting device for induction heating and versions thereof / 2394400
Converting device has a direct voltage source, first and second filter chokes, first and second controlled rectifiers, a first inductor load, a first capacitor and a first initiating device. The first terminal of the direct voltage source is connected to the first lead of the filter choke, the second lead of which is connected to two connected first leads of the first and second controlled rectifiers. The second lead of the first controlled rectifier is connected to connected first leads of the first inductor load, first capacitor and first initiating device. The second leads of these elements are also connected to each other. The second lead of the second controlled rectifier and second leads of the first inductor load, first capacitor and first initiating device are connected to each other and to the first lead of the second filter choke, the second lead of which is connected to the second terminal of the direct voltage source. Versions of the device are described.

Three-phase double-frequency current inverter with zero output for induction heating / 2400018
Three-phase double-frequency current inverter consists of input throttle and three single-phase single-step inverters, every of which comprises serially connected transistor, diode, single-phase active-inductance load and compensating capacitor, at the same time all single-phase inverters with the first outputs of transistors are connected to the second output of input throttle, the first output of which is connected to the first pole of DC voltage source, and with the second outputs of single-phase active-inductance loads, inverters are connected to the second pole of DC voltage source to form three-phase active-inductance load, connected as "star", at the same time all transistors are connected straight relative to polarity of DC voltage source, diodes are connected in accord and serially with transistors, and single-phase active-inductance loads are shunted with compensating capacitors. Three-phase double-frequency current inverter is additionally equipped with three circuits, every of which consists of capacitor and throttle, at the same time in each circuit capacitor is connected between diode and active-inductance load, and throttle is connected parallel to circuit formed by serially connected mentioned capacitor and active-inductance load.

Double-frequency two-step single- to three-phase converter for induction heating and fusion of metals / 2403688
First version of the device consists of five controlled rectifiers of thyristors, two of which, the first and the second, form the first stage and with their first leads through the first input choke are connected to the first pole of a dc voltage source, the parallel first switching capacitor and active-inductive load inductor which is executed from three equal matched series sections are connected to the second leads of the first and second controlled rectifiers, and the third, fourth and fifth controlled rectifiers which form the second stage are connected with their first leads to series points of trimmer chokes of the first, second and third stages with the second, third and fourth switching capacitors in three series circuits each of which is parallel connected with one of three sections of the active-inductive load inductor, and the second leads of three additional rectifiers of the third, fourth and fifth stage are connected to the first lead of the second input choke with its second lead being connected to the second pole of the dc voltage source. According to the second version of the device, there are introduced three additional circuits each consisting of series switching capacitor and trimmer choke, and each of these circuits is also parallel connected to one of three sections of the active-inductive load inductor, thus the first leads of the sixth, seventh and eighth controlled rectifiers of the second stage with the second leads being connected to the first lead of the second input choke are connected to common junctions of the switching capacitors and the trimmer chokes of each additional series circuit. The connection of the first and second controlled rectifiers of the first stage in both versions of the device provides the high-frequency electromagnetic field to be generated, while the connection of the third, fourth and fifth controlled rectifiers of the second stage in the first version of the device and the connection of the third, fourth, fifth, sixth, seventh and eighth controlled rectifiers of the second stage in the second version of the device provides the three-phase low-frequency electromagnetic field to be generated.

Two-frequency two-cascade converter for induction heater / 2405286
Proposed device comprises four controlled gates-thyristors, 1st and 2nd of which makes first cascade, and have their first outputs connected via 1st input throttle with 1st pole of constant voltage source, while 3rd and 4th controlled gates that make second cascade have their output connected via 2nd input throttle with 2nd pole of said power supply. Note here that inductor, an active inductive load, and 1st switching capacitor are connected in parallel to second outputs of 1st and 2nd controlled gates. Besides 1st and 2nd tuned throttles have their outputs connected to extreme output of aforesaid inductor, second outputs of said throttles being connected to first outputs of 3rd and 4th controlled gates. Note here that 2nd switching throttle is connected to the same points.

Three-phase double-frequency voltage inverter with zero lead for inductive heating (versions) / 2439772
Three-phase double-frequency voltage inverter with zero lead consist of three on-phase single-ended inverters; each inverter includes preset inductor choke, single-phase active inductive load and balancing capacitor connected in series. All inverters are connected to DC source and form three single-phase active-inductive loads for three-phase active-inductive load connected by star scheme. All transistors are switched directly in regard to DC source polarity and shunted by opposite diodes, and single-phase active-inductive loads are shunted by balancing capacitors. Three-phase double-frequency voltage inverter with zero lead is equipped additionally with three circuits; each circuit consists of capacitor and choke, at that capacitor is connected to each circuit between transistor and active-inductive load and choke is switched in parallel to the circuit formed in series by the above capacitor and active-inductive load.

Stand-alone harmonica inverter with quazi-resonance switching / 2453976
Invention relates to electric engineering and may be used for induction heaters and other high frequency electric technology loads. The stand-alone harmonica inverter with quazi-resonance switching includes a single-phase bridge on controllable gates with parallel opposed diodes 7-10 connected to inverter's input pins 3-6 through the filter 1,2 throttles. The single-phase bridge is shunted by the filter 11 capacitor, and a.c. output pins of this bridge is coupled with output pin of inverter through the switching throttle 12. The output pins of inverter are shunted with compensating capacitor 13 and connected to the load 14, while the second a.c. output pins of single-phase bridge is connected with the second output pin of inverter through the second switching throttle 15. The switching throttles are implemented as magnet-related and connected harmoniously. He controlled gates are shunted by switching capacitors 16-19, while the a.c. output pins of single phase bridge pins are shunted with snubber capacitor 20.

Control method for stand-alone inverter with resonance switching / 2453977
Invention relates to electric engineering and may be used for induction heaters and other electric technology loads. The control method for stand-alone harmonised inverter with resonance switching of controlled gates, provides for the source of direct supplying voltage E at the input, parallel oscillatory circuit with high Q-factory in the interval [1, 30], additional throttle with induction kL, where k is a numerical coefficient taking values within the interval [1/2, 5], and L is an equivalent induction of the load, that generate and alternately supply control pulses to control gates generated direct and inverted semi-waves of alternating voltage under the load, and define moments of instantaneous value of alternating voltage under the load transfer through the zero value. The next control pulses are controlled and supplied, and the next controlled gates are connected in advance of and with regard to the moments of instantaneous alternating voltage under the load values transfer through the zero value to the interval angle [π/12, π/3]. Then, voltage and instantaneous value of a.c. load current i are measured. The moments of instantaneous alternating voltage under the load value transfer through the zero are defined by solving equations equivalent to the given: E-kL di/dt=0.