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Patent Search Database Used

Keywords Used for Search

Part - I : PATENT SEARCH TECHNIQUE USED

Google Patents

Series inverter circuit having controlled rectifiers

with power diodes in reverse parallel

connectio,-,-,-

:

:

Patent Search & Analysis Report (PSAR)

18-December-2

Team Id

Name

:

:

9134

PANCHAL MAULIK VALJIBHAI

Search String Used SINGLE PHASE SERIES INVERTER(500VA):

Part - II : BASIC DATA OF PATENTED INVENTION/BIBLIOGRAPHIC DATA

Country Patent No

US19600005847 19600201

Number of Results/Hits getting : 5

Category/Field of Invention :

Invention is Related to/Class of Invention

Title of Invention

Patent No.

:

:

:

SERIES INVERTER

Series inverter circuit having controlled rectifiers

with power diodes in reverse parallel connectioUS 3120633 A

Application No.

Date of Filing/Application

Priority Date

Publication/Journal Number - (Issue No. of Journal

in which Patent is published)

:

:

:

:

US19600005847 19600201

US3120633 A

Publication Date

First Filled Country

:

:

Also Published as

01/02/1960

04/02/1964

01/02/1960

United Kingdom

Applicant for Patent is : Individual

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- INVENTOR DETAIL

Address/City/Country of InventorName of Inventor

Genuit Luther L United States

Name of Applicant/Assignee Address/City/Country of Applicant

Gen Electric US

- APPLICANT/ASSIGNEE DETAIL

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Part - III : TECHNICAL PART OF PATENTED INVENTION

Limitation of Prior Technology/Art :

SERIES INVERTER CIRCUIT HAVING CONTROLLED RECTIFIERS WITH POWER DIODES IN REVERS

PARALLEL CONNECTION Filed Feb. 1, 1960 2 Sheets-Sheet 2 United States Patent SERIES INVERTE

CEIMIUET HAVING QQN- TRULLED RECTEFEERS WITH IGWER Di- ODES IN REVERSE PARALLEL CONNE

'IION Luther L. Genuit, Danville, Ill., assignor to General Electric Company, a corporation of New Yo

Filed Feb. 1, 1968, Ser. No. 5,547 13 Claims. (Cl. 321-45) This invention relates to semiconductiv

controlled rectifier inverter circuits for converting direct current into alternating current and is mo

particularly concened with series inverter circuits in which the effects of the inverse voltage on th

circuit during commutation of the controlled rectifiers is minimized.

Specific Problem Solved/Objective of Invention :

In the inverter circuits to which the present invention is applicable, the load circuit has associate

with it an inductance, a resistance and capacitance whereby it functions as an oscillatory circuit an

causes the waveform of the load current to be in shape of a damped sinusoid. The polarity revers

resulting from the damped oscillation provides the inverse voltage required for a conducting controlle

rectifier to revert to a blocking state at the completion of its operating cycle. However, in invert

circuits where the voltages for driving the firing circuits are derived from the commutation voltag

the circuit has to be derated in order that the controlled rectifiers can be protected again

breakdown due to the voltage overshoots which occur during the commutation. A controlled rectifi

is limited by the continuous peak voltage which it will withstantd in both the forward and revers

directions Without breaking down. In any given application, if the voltage rating of the controlle

rectifier is exceeded sufiiciently in the forward direction, it will fire even though no gate signal

present. In a series inverter circuit employing two controlled rectifiers, this may result in both of t

controlled rectifiers conducting simultaneously.

Another limiting factor on the rating utilization of a controlled rectifier in an inverter circuit is th

effect of the load circuit quality (circuit quality denoting the ratio of inductance to the eifectiv

resistance of the load cir- Ice cuit) on the operating voltages in the circuit. In inverter circuits

which no provision is made for the limitation of the voltage overshoots during commutation, th

operation of the circuit may be adversely affected by high load circuit quality since these voltag

vary with the circuit quality. Thus, in order that an inverter circuit be operated with a load circu

having a relatively high quality, it is necessary that the operating voltage levels of the invert

circuits not be affected by variations in the load circuit quality.

A general object of the invention is to provide an improved semiconductive controlled rectifier invert

c1rcuit for producing alternating current from a direct current supply.

Brief about Invention :

Key Learning Points :

In another aspect of the invention, power diodes connected in reverse parallel connection with the controlled rectifier

are employed in a circuit configuration in which a commutation voltage of a fixed magnitude other than zero

maintained during the time the power diodes bypass the current. Such a circuit configuration may be used

conjunction with firing circuits of the type that are excited by fixed commutation voltage.

An inverter circuit comprising a pair of direct current input terminals, 2. pair of serially connected controlled rectifie

connected across said input terminals, a pair of serially connected power diodes connected across said inpu

terminals and each of said power diodes being connected in reverse parallel relationship across one of said controlle

rectifiers, a load circuit including an inductive reactance, a pair of serially connected capacitors connected across

Summary of Invention :

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said input terminals, said capacitors being alternately charged and discharged, a pair of output terminals adapted t

provide an alternating current supply when said input terminals are energized by a direct current source, said loa

circuit being connected across one of said power diodes, firing circuit means connected in circuit with said controllerectifiers to provide a current pulse to alternately fire one of said controlled rectifiers at the end of a predetermine

delay after the other conducting controlled rectifier has been turned off, and starting means for initially firing one o

said controlled rectifiers to start operation of the inverter circuit.

Number of Claims 13:

Patent Status Granted Patent:

How much this invention is related with your IDP/UDP? < 70 %:

Do you have any idea to do anything around the said invention to improve it? :

NOTHING