CN217307539U

CN217307539U - Generating circuit of asymmetric positive and negative voltage driving signals and electric welding machine

Info

Publication number: CN217307539U
Application number: CN202220593886.5U
Authority: CN
Inventors: 王汝本; 张晓东
Original assignee: Guangdong Welltech Technology Co ltd
Current assignee: Guangdong Welltech Technology Co ltd
Priority date: 2022-03-17
Filing date: 2022-03-17
Publication date: 2022-08-26
Anticipated expiration: 2032-03-17

Abstract

The utility model discloses a generating circuit and electric welding of asymmetric positive and negative voltage drive signal, including vary voltage module and signal generation module, the vary voltage module includes primary winding and secondary winding, the signal generation module includes first steady voltage piece, switch module and signal output part, first steady voltage piece, secondary winding and signal output part establish ties in order to constitute at least partial signal generation return circuit, switch module is parallelly connected with secondary winding, the drive signal that the signal generation return circuit formed is in signal output part output, through the formulation to first steady voltage piece parameter, can be so that the drive signal of the different positive and negative voltage amplitude of signal output part output, order about contravariant module steady operation.

Description

Generating circuit of asymmetric positive and negative voltage driving signals and electric welding machine

Technical Field

The utility model relates to an electronic circuit technical field, in particular to generating circuit and electric welding of asymmetric positive and negative voltage drive signal.

Background

The existing electric welding machine generally comprises an inverter module, the inverter module is composed of a plurality of switching tubes such as IGBTs (insulated gate bipolar transistors), the electric welding machine needs to be provided with a driving circuit 300 to drive the switching tubes to operate, in the actual operation process, the driving circuit 300 can output high and low levels to control the on and off of the switching tubes, in order to improve the turn-off efficiency of the switching tubes, the driving circuit 300 can generate positive and negative voltage pulse signals, the negative voltage acts on the switching tubes, the switching tubes can be rapidly turned off, however, as shown in figures 1 and 2, in order to drive the switching tubes to be turned on, the amplitude of the positive voltage needs to reach a large value, and by utilizing the structure of the traditional driving circuit 300, the positive and negative voltage amplitude values of the generated pulse signals are basically the same, the negative voltage at the moment, which is at the large value acts on the switching tubes, and the switching tubes are easily damaged.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides an asymmetric positive and negative voltage drive signal's generating circuit and electric welding generates the drive signal of different positive and negative voltage amplitude adaptively, orders about contravariant module steady operation.

According to the utility model discloses a circuit for generating asymmetric positive negative voltage drive signal of first aspect embodiment includes: the voltage transformation module comprises a primary winding and a secondary winding; the signal generating module comprises a first voltage stabilizing piece, a switch module and a signal output end, wherein the first voltage stabilizing piece, the secondary winding and the signal output end are connected in series to form at least part of a signal generating loop, the switch module is connected with the secondary winding in parallel, and a driving signal formed by the signal generating loop is output from the signal output end.

According to the utility model discloses asymmetric positive negative voltage drive signal's generating circuit has following beneficial effect at least:

the generating circuit of the utility model inputs pulse signals at the primary winding side, the secondary winding is coupled with the primary winding for induction, when the secondary winding outputs forward induced voltage, the switch winding is switched off, the secondary winding outputs the forward induced voltage to pass through the first voltage stabilizing piece and the signal output end, the first voltage stabilizing piece divides the induced voltage, the voltage amplitude output by the signal output end is the difference value of the induced voltage and the voltage drop of the first voltage stabilizing piece, when the secondary winding outputs reverse induced voltage, the switch winding is switched on, thereby, the voltage amplitude output by the signal output end is the voltage drop of the first voltage stabilizing piece under the action of the first voltage stabilizing piece, therefore, by formulating the amplitude of the pulse signal and the parameters of the first voltage stabilizing piece, the signal output end can output driving signals with different positive and negative voltage amplitudes to drive the inversion module to stably operate.

According to some embodiments of the invention, the controlled end of the switch module is connected to the secondary winding to be switched on and off by the induced current or the induced voltage on the secondary winding.

According to some embodiments of the present invention, the switch module includes a voltage regulator D3, a resistor R3, a diode D2 and a switch tube K1, a cathode of the diode D2 is connected to one end of the resistor R3 and one end of the secondary winding, an anode of the diode D2 is connected to an anode of the voltage regulator D3, an output end of the switch tube K1 and one end of the signal output end, a cathode of the voltage regulator D3 is connected to the other end of the resistor R3 and a controlled end of the switch tube K1, and an input end of the switch tube K1 is connected to one end of the first voltage regulator and the other end of the secondary winding.

According to some embodiments of the present invention, the switch further comprises a resistor R4 and a diode D4, one end of the resistor R4 is connected to one end of the switch module and one pole of the signal output end, the other end of the resistor R4 is connected to the negative pole of the diode D4, and the positive pole of the diode D4 is connected to the other end of the first voltage stabilizer and the other pole of the signal output end.

According to some embodiments of the invention, the signal output terminal further comprises a second voltage stabilizer, the second voltage stabilizer being connected in parallel with the signal output terminal.

According to some embodiments of the present invention, the second voltage stabilizer includes a first voltage stabilizer group and a second voltage stabilizer group, a negative electrode of the first voltage stabilizer group is connected to one electrode of the signal output terminal, a positive electrode of the first voltage stabilizer group is connected to a positive electrode of the second voltage stabilizer group, and a negative electrode of the second voltage stabilizer group is connected to the other electrode of the signal output terminal.

According to some embodiments of the invention, the secondary winding and the signal generation module are all plural, and the secondary winding and the signal generation module are connected in one-to-one correspondence.

According to the utility model discloses electric welding of second aspect embodiment, including the generating circuit of the asymmetric positive and negative voltage drive signal that the contravariant module and any above-mentioned embodiment are disclosed, the signal output part of the generating circuit of asymmetric positive and negative voltage drive signal with the contravariant module is connected with the drive the contravariant module operation.

According to the utility model discloses electric welding has following beneficial effect at least:

the utility model discloses electric welding utilizes the drive signal drive of asymmetric positive and negative voltage drive signal's generating circuit output contravariant module operation, generating circuit can export the drive signal of different positive and negative voltage amplitude, and the switch tube of control contravariant module switches on and breaks off fast for contravariant module steady operation.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a circuit diagram of a conventional driving circuit;

FIG. 2 is a waveform diagram of an output of a conventional driving circuit;

fig. 3 is a circuit diagram of one embodiment of the driving circuit of the present invention;

fig. 4 is a waveform diagram of an output of one embodiment of the driving circuit of the present invention.

Reference numerals:

< conventional solution >

A drive circuit 300.

< the utility model >

The transformer module 100, the primary winding 110, the secondary winding 120, the signal generation module 200, the first voltage stabilizer 210, the switch module 220, the signal output end 230, the second voltage stabilizer 240, the first voltage stabilizer bank 241, and the second voltage stabilizer bank 242.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the orientation description, such as the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., is the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplicity of description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 3-4, the circuit for generating asymmetric positive and negative voltage driving signals according to the embodiment of the first aspect of the present invention includes a voltage transformation module 100 and a signal generation module 200, the voltage transformation module 100 includes a primary winding 110 and a secondary winding 120, the signal generation module 200 includes a first voltage stabilizer 210, a switch module 220 and a signal output end 230, the first voltage stabilizer 210, the secondary winding 120 and the signal output end 230 are connected in series to form at least a part of a signal generation loop, the switch module 220 is connected in parallel with the secondary winding 120, and a driving signal formed by the signal generation loop is output at the signal output end 230.

It should be noted that the power loop of the electric welding machine generally includes a first rectifier module, an inverter module, a transformer and a second rectifier module which are connected in sequence, the inverter module generally has an H-shaped inverter structure formed by four IGBTs, and the generating circuit can generate a plurality of driving signals to respectively drive each IGBT to operate.

In some embodiments of the present invention, there may be a plurality of secondary windings 120 and signal generating modules 200, and the secondary windings 120 and the signal generating modules 200 are connected in a one-to-one correspondence, and in particular, the plurality of secondary windings 120 may be coupled with the primary winding 110, so that a plurality of driving signals are generated by the plurality of signal generating modules 200 respectively to drive the respective IGBTs to operate.

The utility model discloses generating circuit, at primary winding 110 side input pulse signal, secondary winding 120 and primary winding 110 coupling response, when secondary winding 120 output forward induced voltage, the switch winding disconnection, secondary winding 120 output forward induced voltage passes through first stabilizer 210 and signal output part 230, first stabilizer 210 divides the induced voltage partial pressure, the voltage amplitude of signal output part 230 output is the difference of induced voltage and the pressure drop of first stabilizer 210, and when secondary winding 120 output reverse induced voltage, the switch winding is closed, thereby to secondary winding 120 short circuit, receive the effect of first stabilizer 210, the voltage amplitude of signal output part 230 output is the pressure drop of first stabilizer 210, therefore, through the formulation to pulse signal's amplitude and first stabilizer 210 parameter, can make signal output part 230 output the drive signal of different positive and negative voltage amplitudes, and driving the inversion module to stably operate.

Specifically, as shown in fig. 3, the first voltage regulator 210 may include a voltage regulator D1, a negative electrode of the voltage regulator D1 is connected to one end of the switch module 220 and the primary winding 110, respectively, a negative electrode of the voltage regulator D1 may be connected to the primary winding 110 through a resistor R1, a positive electrode of the voltage regulator D1 is connected to the signal output terminal 230, and a positive electrode of the voltage regulator D1 may be connected to the signal output terminal 230 through a resistor R2.

Specifically, a capacitor C1 may be connected in parallel to the first voltage stabilizer 210, so that the voltage may be stabilized by matching with the first voltage stabilizer 210.

In some embodiments of the present invention, as shown in fig. 3, the controlled terminal of the switch module 220 is connected to the secondary winding 120 to be switched on and off by the induced current or induced voltage on the secondary winding 120.

The input pulse signal acts on the primary winding 110, and the secondary winding 120 generates an induced current or an induced voltage, so that the switching module 220 can be triggered to be automatically switched on and off. Of course, a controller may be provided, and the controller controls the switch module 220 to be turned on or off according to the input pulse signal.

In some embodiments of the present invention, as shown in fig. 3, the switch module 220 includes a voltage regulator D3, a resistor R3, a diode D2 and a switch tube K1, a cathode of the diode D2 is connected to one end of the resistor R3 and one end of the secondary winding 120, an anode of the diode D2 is connected to an anode of the voltage regulator D3, an output end of the switch tube K1 and one end of the signal output end 230, a cathode of the voltage regulator D3 is connected to the other end of the resistor R3 and the controlled end of the switch tube K1, and an input end of the switch tube K1 is connected to one end of the first voltage regulator 210 and the other end of the secondary winding 120.

Specifically, as shown in fig. 3, the switch tube K1 may be a transistor, a MOS transistor, a thyristor, etc., and in some embodiments, if the switch tube K1 is an N-type switch tube, the switch tube K1 may be triggered to be turned on when the voltage of the 5 th pin of the secondary winding 120 is higher than the voltage of the 6 th pin, and the switch tube K1 may be triggered to be turned off when the voltage of the 5 th pin of the secondary winding 120 is lower than or equal to the voltage of the 6 th pin.

In some embodiments of the present invention, as shown in fig. 3, further include resistor R4 and diode D4, one end of resistor R4 is connected with one end of switch module 220 and one pole of signal output part 230 respectively, the other end of resistor R4 is connected with the negative pole of diode D4, the positive pole of diode D4 is connected with the other end of first voltage regulator 210 and the other pole of signal output part 230 respectively, when the switch tube K1 is disconnected, resistor R4 and diode D4 can divide the voltage with first voltage regulator 210, so that resistor R4 can form terminal voltage output for signal output part 230.

In some embodiments of the present invention, a second voltage stabilizer 240 is further included, the second voltage stabilizer 240 is connected in parallel with the signal output end 230, and the second voltage stabilizer 240 can stabilize the driving signal of the output of the signal output end 230.

In some embodiments of the present invention, the second voltage stabilizer 240 includes a first voltage stabilizer group 241 and a second voltage stabilizer group 242, the negative electrode of the first voltage stabilizer group 241 is connected to one electrode of the signal output terminal 230, the positive electrode of the first voltage stabilizer group 241 is connected to the positive electrode of the second voltage stabilizer group 242, the negative electrode of the second voltage stabilizer group 242 is connected to the other electrode of the signal output terminal 230, thereby the voltage stabilizing effect on the forward and reverse voltages of the driving signal can be achieved, because the forward and reverse voltage amplitudes are different, the voltage stabilizing specifications of the first voltage stabilizer group 241 and the second voltage stabilizer group 242 are different, for example, the first voltage stabilizer group 241 can be composed of a voltage stabilizer D7, and the second voltage stabilizer group 242 can be formed by the series connection of a voltage stabilizer D5 and a voltage stabilizer D6 in the same direction.

Specifically, as shown in fig. 3 and 4, the working principle of the present design is to input an alternating-current pulse signal to the primary winding 110, and generally, the pulse signal is a signal with positive and negative same amplitudes.

With the pin of the secondary winding 1206 as a reference ground, when the pin 5 is at a high level, the switching tube K1 is in an off state, a voltage signal of the pin 5 is transmitted to the signal output end 230 through the resistor R1, the voltage regulator tube D1 and the resistor R2, the resistances of the resistor R1 and the resistor R2 are small, the current in a signal generation loop is small, the voltage drop on the resistor R1 and the resistor R2 can be ignored, and the voltage amplitude Uout output by the signal output end 230 is the voltage drop Ud1 of the input voltage Uin-the voltage regulator tube D1;

with the pin of the secondary winding 1206 as a reference ground, when the pin 5 is at zero level, the voltage amplitude Uout output by the signal output terminal 230 is 0V;

with the pin of the secondary winding 1206 as a reference ground, when the pin 5 is negative, the switching tube K1 is turned on, and at this time, the voltage regulator tube D1 is connected in series between the two poles of the signal output terminal 230, and the amplitude Uout of the voltage output by the signal output terminal 230 is-Ud 1.

According to the utility model discloses electric welding of second aspect embodiment, including the generating circuit of the asymmetric positive and negative voltage drive signal that the contravariant module and any above-mentioned embodiment are disclosed, the signal output part 230 of the generating circuit of asymmetric positive and negative voltage drive signal is connected with the contravariant module and moves in order to drive the contravariant module.

The utility model discloses electric welding, the drive signal drive contravariant module operation of the generating circuit output that utilizes asymmetric positive and negative voltage drive signal, generating circuit can export the drive signal of different positive and negative voltage amplitude, and the switch tube of control contravariant module switches on and breaks off fast for contravariant module steady operation.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A circuit for generating asymmetric positive and negative voltage drive signals, comprising:

the voltage transformation module comprises a primary winding and a secondary winding;

the signal generating module comprises a first voltage stabilizing piece, a switch module and a signal output end, wherein the first voltage stabilizing piece, the secondary winding and the signal output end are connected in series to form at least part of a signal generating loop, the switch module is connected with the secondary winding in parallel, and a driving signal formed by the signal generating loop is output from the signal output end.

2. A circuit for generating an asymmetric positive-negative voltage drive signal as claimed in claim 1, wherein: and the controlled end of the switch module is connected with the secondary winding to be triggered to be switched on and off by the induced current or the induced voltage on the secondary winding.

3. A circuit for generating an asymmetric positive-negative voltage drive signal as claimed in claim 2, wherein: the switch module comprises a voltage-regulator tube D3, a resistor R3, a diode D2 and a switch tube K1, wherein the cathode of the diode D2 is connected with one end of the resistor R3 and one end of the secondary winding respectively, the anode of the diode D2 is connected with the anode of the voltage-regulator tube D3, the output end of the switch tube K1 and one pole of the signal output end respectively, the cathode of the voltage-regulator tube D3 is connected with the other end of the resistor R3 and the controlled end of the switch tube K1 respectively, and the input end of the switch tube K1 is connected with one end of the first voltage-regulator tube and the other end of the secondary winding respectively.

4. The circuit for generating an asymmetric positive-negative voltage driving signal as claimed in claim 1, further comprising a resistor R4 and a diode D4, wherein one end of the resistor R4 is connected to one end of the switch module and one pole of the signal output terminal, respectively, the other end of the resistor R4 is connected to a cathode of the diode D4, and an anode of the diode D4 is connected to the other end of the first voltage regulator and the other pole of the signal output terminal, respectively.

5. The circuit of claim 1, further comprising a second voltage regulator connected in parallel with said signal output.

6. The circuit according to claim 5, wherein the second voltage stabilizer includes a first voltage stabilizer group and a second voltage stabilizer group, a cathode of the first voltage stabilizer group is connected to one pole of the signal output terminal, an anode of the first voltage stabilizer group is connected to an anode of the second voltage stabilizer group, and a cathode of the second voltage stabilizer group is connected to the other pole of the signal output terminal.

7. The circuit according to claim 1, wherein there are a plurality of secondary windings and signal generating modules, and the secondary windings and the signal generating modules are connected in a one-to-one correspondence.

8. A welding machine comprising an inverter module and a circuit for generating an asymmetric positive and negative voltage drive signal as claimed in any one of claims 1 to 7, wherein the signal output terminal of the circuit for generating an asymmetric positive and negative voltage drive signal is connected to the inverter module to drive the inverter module to operate.