CN217445267U

CN217445267U - Bridge PWM inverter composed of reverse conducting thyristor and switch

Info

Publication number: CN217445267U
Application number: CN202122763842.0U
Authority: CN
Inventors: 龚秋声
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-11-06
Filing date: 2021-11-06
Publication date: 2022-09-16
Anticipated expiration: 2031-11-06

Abstract

The bridge PWM inverter consists of 2 reverse conducting thyristors and 2 reverse conducting switches connected to form a bridge circuit. The 2 reverse conducting thyristors replace 2 reverse conducting switches connected with one end of a power supply in a single-phase full bridge PWM inverter in the textbook, and the difference is only that when V1 and V2 are switched off, an inductance L freewheeling loop is different. The output voltage and waveform are substantially the same. The cost of contrary conductive thyristor is far less than contrary conductive switch, consequently, the bridge type PWM dc-to-ac converter cost that contrary conductive thyristor and switch are constituteed is far less than current bridge type PWM dc-to-ac converter, the utility model discloses a PWM dc-to-ac converter has that the switching device is with low costs, and work is more reliable, and the higher advantage of price/performance ratio has great economic benefits and social.

Description

Bridge PWM inverter composed of reverse conducting thyristor and switch

Technical Field

The utility model relates to a bridge type PWM dc-to-ac converter of constituteing with contrary thyristor and the switch that leads of leading.

Background

The single-phase measure PWM inverter circuit on textbook only has half-bridge inverter circuit and full-bridge inverter circuit, and half-bridge inverter circuit only uses 2 full-controlled switch chops, and is with low costs, and output alternating current peak voltage only has half of input direct current voltage, and output is little, and full-bridge inverter circuit chops with 4 full-controlled switches, and is with high costs, and output alternating current peak voltage is input direct current voltage, and output is big. The inverter is mainly used for designing and manufacturing frequency converters, hundreds of millions of single-phase frequency converters are produced all the year round, so that the cost of each inverter is reduced, and huge economic benefits and huge social benefits can be generated. The reverse conducting thyristor can work at high frequency and is 1 half-control switch, and because the cost of the reverse conducting thyristor is far lower than that of a full-control chopping switch in the existing inverter circuit and the reliability is better, the cost of the inverter can be reduced by researching to use the reverse conducting thyristor to replace a part of switches in the full-bridge inverter, and the cost performance is improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims at designing a bridge type PWM inverter circuit that cost is lower than current full-bridge PWM inverter, becoming another kind of bridge type PWM inverter, in order to be different from current full-bridge type PWM inverter, can name it for goer's bridge type PWM inverter or reverse conducting thyristor and reverse conducting bridge type PWM inverter that the switch constitutes.

Bridge PWM inverter composed of reverse conducting thyristors and reverse conducting switches for achieving the purpose, the bridge PWM inverter composed of reverse conducting thyristors and switches provided by the design comprises a direct current power supply E, a resistor R, an inductor L, 2 reverse conducting thyristors CTR1 and CTR2, 2 diodes D1 and D2, 2 IGBTs or triodes V1 and V2 and a trigger control circuit thereof, a reverse conducting switch S1 composed of D1 and V1, a reverse conducting switch S2 composed of D2 and V2, and inductive loads composed of R and L, and is characterized in that: the CTR1 and the CTR2 replace 2 reverse conducting switches connected with one end of an electric direct-current power supply in a single-phase full-bridge PWM inverter, a first direct-current input end (1) is connected with one end of a direct-current power supply E, one end of the CTR2 and one end of the CTR1, a second direct-current input end (2) is connected with the other end of the direct-current power supply E, one end of the S1 and one end of the S2, a first alternating-current output end (3) is connected with the other end of the S1, the other end of the CTR2 and one end of a resistor R, the other end of the resistor R (5) is connected with one end of an inductor L, and a second alternating-current output end (4) is connected with the other end of the CTR1, the other end of the S2 and the other end of the inductor L.

Drawings

Fig. 1 is the utility model discloses a bridge type PWM inverter that reverse conducting thyristor and switch are constituteed, wherein: e is a dc power supply, S1 and S2 are reverse conducting switches, R is a resistor, L is an inductor, V1 and V2 are triode switches, D1 and D2 are diodes, and CTR1 and CTR2 are reverse conducting thyristors.

Detailed Description

Fig. 1 is a bridge PWM inverter composed of a reverse conducting thyristor and a switch according to the present invention, which can be known from fig. 1: the thyristor is formed by bridge connection of 2 reverse conducting thyristors (CTR1 and CTR2) and 2 reverse conducting switches (S1 and S2), and is characterized in that; 2 reverse conducting thyristors are used for replacing 2 reverse conducting switches connected with one end of a power supply in a full-bridge PWM inverter circuit on a textbook, the trigger voltage of the reverse conducting thyristors is triggered by direct current voltage in the period from the 1 st PWM pulse to the last 1 PWM pulse, and the inversion principle is as follows:

a) when the control electrode of the triode switch V1 has PWM pulse and the CTR1 has the DC trigger voltage, when V1 is switched on, the two output ends obtain a power supply voltage E with 4 ends as positive and 3 ends as negative, and the output current flows from 4 ends to 3 ends. When the voltage V1 is cut off, the electric energy stored in the inductor L flows through a loop of a resistor R, CTR2 and a CTR1, when the last 1 PWM pulse is reached, the width of a dry pulse is small, and the continuous flow current is rapidly reduced to be lower than the maintaining current of the CTR1 through a loop of R, CTR2 and CTR1, so that the CTR1 recovers the blocking capability.

b) When the control pole of the triode switch V2 has PWM pulse and CTR2 direct current trigger voltage, when V2 is switched on, the two output ends obtain power supply voltage E with 3 ends positive and 4 ends negative, and output current flows from 3 ends to 4 ends. When V1 is turned off, the electric energy stored in the inductor L flows through the circuits of CTR1, D2 and R, when the pulse width of the dry pulse is very small, the continuous flow current is rapidly reduced to be lower than the maintaining current of CTR2 through the circuits of CTR1, CTR2 and R, and the interruption capability of CTR2 is recovered.

From the above, it can be seen that: the utility model discloses a bridge type PWM inverter that contrary thyristor and contrary switch of leading of reverse lead constitute, it is different only in inductance L afterflow return circuit when V1 and V2 close with the textbook on. The output voltage and waveform are substantially the same.

The utility model discloses a bridge type PWM dc-to-ac converter that contrary thyristor and switch are constituteed compares with the existing full measure PWM dc-to-ac converter, and the switching device is with low costs, and work is more reliable, and the price/performance ratio is higher, consequently, the utility model discloses there are great economic benefits and social after the implementation. The PWM circuit that switch and reverse conducting thyristor are constituteed is not had all to reverse conducting in world textbook and the current inverter circuit, consequently, the utility model provides an inverter circuit adds a new PWM inverter circuit for the circuit of dc-to-ac converter.

Claims

1. A bridge PWM inverter composed of reverse conducting thyristors and switches is composed of a direct current power supply E, a resistor R, an inductor L, 2 reverse conducting thyristors CTR1 and CTR2, 2 diodes D1 and D2, 2 IGBTs or triodes V1 and V2 and a trigger control circuit thereof, wherein the D1 and the V1 form a reverse conducting switch S1, the D2 and the V2 form a reverse conducting switch S2, and the R and the L form an inductive load, and is characterized in that: the CTR1 and the CTR2 replace 2 reverse conducting switches connected with one end of an electric direct-current power supply in a single-phase full-bridge PWM inverter, a first direct-current input end (1) is connected with one end of a direct-current power supply E, one end of the CTR2 and one end of the CTR1, a second direct-current input end (2) is connected with the other end of the direct-current power supply E, one end of the S1 and one end of the S2, a first alternating-current output end (3) is connected with the other end of the S1, the other end of the CTR2 and one end of a resistor R, the other end of the resistor R (5) is connected with one end of an inductor L, and a second alternating-current output end (4) is connected with the other end of the CTR1, the other end of the S2 and the other end of the inductor L.

2. A bridge PWM inverter comprising thyristors and switches according to claim 1, wherein: the 2 thyristors CTR1 and CTR2 trigger signals are dc voltages from the 1 st to the last 1 PWM pulse.