CN113595368B - High-voltage frequency converter, IGBT isolation driver and common mode suppression circuit thereof - Google Patents

High-voltage frequency converter, IGBT isolation driver and common mode suppression circuit thereof Download PDF

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Publication number
CN113595368B
CN113595368B CN202110911216.3A CN202110911216A CN113595368B CN 113595368 B CN113595368 B CN 113595368B CN 202110911216 A CN202110911216 A CN 202110911216A CN 113595368 B CN113595368 B CN 113595368B
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secondary winding
resistor
switching tube
common
mode rejection
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CN113595368A (en
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李军
张�杰
张弛
施贻蒙
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Hangzhou Feishide Technology Co ltd
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HANGZHOU FIRSTACK TECHNOLOGY CO LTD
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
    • H02M5/16—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion of frequency

Abstract

The application provides a high-voltage inverter, IGBT isolation driver and common mode suppression circuit thereof, this common mode suppression circuit is applied to the signal transformer among the IGBT isolation driver, wherein: when a common-mode voltage signal appears in the signal transformer, the common-mode rejection unit at the homonymous end of the secondary winding and the common-mode rejection unit at the synonym end of the secondary winding are respectively used for bypassing the common-mode current on the homonymous end of the secondary winding and the synonym end of the secondary winding by taking the output level of a corresponding comparator in the IGBT isolation driver as low as a control target; that is, the common mode suppression circuit provided by the application can bypass the common mode current on the homonymous end of the secondary winding and the heteronymous end of the secondary winding respectively through the corresponding common mode suppression unit when the common mode voltage signal appears in the signal transformer, so that the signal processing unit on the high-voltage side of the signal transformer is prevented from receiving two pulses with the same height, and the normal work of the signal processing unit in the IGBT isolation driver is ensured.

Description

High-voltage frequency converter, IGBT isolation driver and common mode suppression circuit thereof
Technical Field
The invention relates to the technical field of circuit electronics, in particular to a high-voltage frequency converter, an IGBT isolation driver and a common mode suppression circuit thereof.
Background
In the high-voltage inverter, as shown in fig. 1, a controller (CONTROL circuit in the figure) transmits a CONTROL signal of a low-voltage side to an IGBT of a high-voltage side through an IGBT isolation driver (GATE DRIVE in the figure), thereby implementing an IGBT switch. The IGBT isolation driver generally uses isolators such as optocouplers, capacitive couplers, and transformers to perform isolated transmission of signals.
Taking a signal transformer as an example, as shown in fig. 2, the input and the output of the signal transformer are respectively located at a high-voltage side and a low-voltage side, a VCM (common mode voltage) signal is generated by an IGBT at the high-voltage side during switching, and a common mode current is formed between the high-voltage side and the low-voltage side through a coupling capacitor inside the signal transformer, so that a signal processing unit at the high-voltage side receives two pulses at the same high voltage, thereby affecting the normal operation of the signal processing unit.
Disclosure of Invention
To this, the application provides a high-voltage inverter, IGBT isolation driver and common mode suppression circuit thereof to the common mode voltage signal that produces when solving the IGBT switch of high-pressure side can form common mode current between high-pressure side and low pressure side, leads to the signal processing unit of high-pressure side to receive two pulses with the high, thereby influences the problem of signal processing unit's normal work.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the invention discloses a common mode suppression circuit in a first aspect, which is applied to a signal transformer in an IGBT isolation driver, and comprises: the common mode rejection unit of the homonymous end of the secondary winding and the common mode rejection unit of the heteronymous end of the secondary winding;
and the common mode suppression unit of the homonymous end of the secondary winding and the common mode suppression unit of the synonym end of the secondary winding are respectively used for bypassing the common mode current on the homonymous end of the secondary winding and the synonym end of the secondary winding by taking the output level of a corresponding comparator in the IGBT isolation driver as a low control target when the signal transformer generates a common mode voltage signal.
Optionally, in the common mode rejection circuit, the common mode rejection unit at the synonym terminal of the secondary winding and the common mode rejection unit at the synonym terminal of the secondary winding have the same structure.
Optionally, in the above common mode rejection circuit, the common mode rejection unit of the secondary winding dotted terminal includes: the circuit comprises a first resistor, a second resistor, a first switching tube and a second switching tube; wherein:
one end of the first resistor is connected with the synonym end of the secondary winding of the signal transformer; the other end of the first resistor is respectively connected with the control end of the first switch tube, the second end of the first switch tube and the control end of the second switch tube;
the first end of the first switch tube is connected with the first end of the second switch tube and is grounded;
the second end of the second switch tube is connected with one end of the second resistor, and the connecting point is connected with the non-inverting input end of the corresponding comparator in the IGBT isolation driver;
and the other end of the second resistor is connected with the dotted terminal of the secondary winding of the signal transformer.
Optionally, in the common mode rejection circuit, the first switch tube and the second switch tube are both NMOS tubes, or triodes.
Optionally, in the above common mode rejection circuit, the common mode rejection unit of the different-name end of the secondary winding includes:
the third resistor, the fourth resistor, the third switching tube and the fourth switching tube; wherein:
one end of the third resistor is connected with the dotted end of the secondary winding of the signal transformer; the other end of the third resistor is connected with the control end of the third switching tube, the second end of the third switching tube and the control end of the fourth switching tube respectively;
the first end of the third switching tube is connected with the first end of the fourth switching tube and is grounded;
the second end of the fourth switching tube is connected with one end of the fourth resistor, and the connecting point is connected with the non-inverting input end of the corresponding comparator in the IGBT isolation driver;
the other end of the fourth resistor is connected with the synonym end of the secondary winding of the signal transformer.
Optionally, in the common mode rejection circuit, the third switching tube and the fourth switching tube are both NMOS tubes, or triodes.
Optionally, in the above common mode rejection circuit, the common mode rejection unit of the secondary winding dotted terminal includes:
the first operational amplifier, the fifth resistor, the sixth resistor and the fifth switch tube; wherein:
the non-inverting input end of the first operational amplifier is connected with the different name end of the secondary winding of the signal transformer; the inverting input end of the first operational amplifier is connected with the output end of the first operational amplifier and one end of the fifth resistor;
the other end of the fifth resistor is connected with the control end of the fifth switching tube;
the second end of the fifth switching tube is connected with one end of the sixth resistor, and the connecting point is connected with the non-inverting input end of the corresponding comparator in the IGBT isolation driver;
the first end of the fifth switching tube is grounded;
and the other end of the sixth resistor is connected with the dotted end of the secondary winding of the signal transformer.
Optionally, in the above common mode rejection circuit, the common mode rejection unit of the different-name end of the secondary winding includes:
the second operational amplifier, the seventh resistor, the eighth resistor and the sixth switching tube; wherein:
the non-inverting input end of the second operational amplifier is connected with the homonymous end of the secondary winding of the signal transformer; the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier and one end of the seventh resistor respectively;
the other end of the seventh resistor is connected with the control end of the sixth switching tube;
the second end of the sixth switching tube is connected with one end of the eighth resistor, and the connecting point is connected with the non-inverting input end of the corresponding comparator in the IGBT isolation driver;
the first end of the sixth switching tube is grounded;
and the other end of the eighth resistor is connected with the synonym end of the secondary winding of the signal transformer.
Optionally, in the common mode rejection circuit, the fifth switching tube and the sixth switching tube are both NMOS tubes, or triodes.
The second aspect of the present invention discloses an IGBT isolation driver, including: the device comprises a control unit, a signal transformer and a signal processing unit; wherein:
the control unit is used for controlling the signal transformer to work according to the received PWM signal;
the signal processing unit is used for controlling corresponding comparators in the signal processing unit to output corresponding signals according to the received signals output by the signal transformer;
the signal transformer is provided with the common mode rejection circuit as disclosed in any one of the first aspect, and is configured to control the comparator in the signal processing unit to output a low level when the common mode voltage signal is present.
The third aspect of the present invention discloses a high voltage frequency converter, comprising: the IGBT isolation driver is arranged between the controller and the corresponding IGBT driving tube in the IGBT power unit;
the controller is used for sending PWM signals to the IGBT isolation driver;
and the IGBT isolation driver is used for controlling corresponding IGBT driving tubes in the IGBT power unit to work according to the received PWM signal.
Optionally, in the high-voltage inverter, the number of the IGBT driving tubes in the IGBT power unit is 4.
The invention provides a common mode suppression circuit, which is applied to a signal transformer in an IGBT isolation driver, and comprises: the common mode rejection unit of the homonymous end of the secondary winding and the common mode rejection unit of the heteronymous end of the secondary winding; when a common-mode voltage signal appears in the signal transformer, the common-mode rejection unit at the homonymous end of the secondary winding and the common-mode rejection unit at the synonym end of the secondary winding are respectively used for bypassing the common-mode current on the homonymous end of the secondary winding and the synonym end of the secondary winding by taking the output level of a corresponding comparator in the IGBT isolation driver as low as a control target; that is, the common mode suppression circuit provided by the application can bypass the common mode current on the homonymous end of the secondary winding and the heteronymous end of the secondary winding respectively through the corresponding common mode suppression unit when the common mode voltage signal appears in the signal transformer, so that the signal processing unit on the high-voltage side of the signal transformer is prevented from receiving two pulses with the same height, and the normal work of the signal processing unit in the IGBT isolation driver is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a conventional high-voltage inverter according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a conventional IGBT isolation driver according to an embodiment of the present application;
fig. 3 and fig. 4 are schematic structural diagrams of two common mode rejection circuits provided in the embodiment of the present application;
fig. 5 and 6 are current flow diagrams of two common mode rejection circuits provided by an embodiment of the present application;
fig. 7 is a schematic structural diagram of a conventional common mode rejection circuit according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of another common mode rejection circuit according to an embodiment of the present disclosure;
fig. 9 is a schematic structural diagram of an IGBT isolation driver according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of a high-voltage frequency converter according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the application provides a common mode suppression circuit to solve the problem that a common mode voltage signal generated when an IGBT on a high-voltage side is switched on and off can form a common mode current between the high-voltage side and a low-voltage side, so that a signal processing unit on the high-voltage side receives two pulses with the same height, and the normal work of the signal processing unit is influenced.
Referring to fig. 3, the common mode rejection circuit is applied to a signal transformer in an IGBT isolation driver, and the common mode rejection circuit mainly includes: a common mode rejection unit 101 at the homonymous end of the secondary winding and a common mode rejection unit 102 at the synonym end of the secondary winding.
And the common mode rejection unit 101 at the homonymous end of the secondary winding and the common mode rejection unit 102 at the synonym end of the secondary winding are respectively used for bypassing the common mode current at the homonymous end of the secondary winding and the synonym end of the secondary winding by taking the output level of a corresponding comparator in the IGBT isolation driver as a low control target when the common mode voltage signal occurs in the signal transformer. T1 in fig. 3, 4, 5, 6, 7, and 8 denotes a signal transformer, INP denotes a synonym terminal of a secondary winding of the signal transformer, and INN denotes a synonym terminal of the secondary winding of the signal transformer.
In practical application, the common mode rejection unit 101 at the same-name end of the secondary winding and the common mode rejection unit 102 at the different-name end of the secondary winding have the same structure.
Referring to fig. 3, the common mode rejection unit 101 of the same-name end of the secondary winding may include: the circuit comprises a first resistor R1, a second resistor R2, a first switch tube Q1 and a second switch tube Q2. Wherein:
one end of the first resistor R1 is connected with the synonym terminal (INN in the figure) of the secondary winding of the signal transformer; the other end of the first resistor R1 is connected to the control terminal of the first switch Q1, the second terminal of the first switch Q1, and the control terminal of the second switch Q2, respectively.
The first end of the first switch tube Q1 is connected to the first end of the second switch tube Q2 and grounded.
The second end of the second switch tube Q2 is connected with one end of a second resistor R2, and the connection point is connected with the non-inverting input end of the corresponding comparator in the IGBT isolation driver.
IN practical applications, the corresponding comparator IN the IGBT isolation driver to which the second terminal of the second switching tube Q2 and one terminal of the second resistor R2 are both connected may be U1 shown IN fig. 3, 4, 5, 6, 7, and 8, and provides a comparison voltage for the comparator, that is, VNP _ IN the figure. Wherein the inverting input of the comparator provides a reference voltage (VREF in the figure) via a DC voltage source (DC in the figure).
The other end of the second resistor R2 is connected to the dotted terminal (INP in the figure) of the secondary winding of the signal transformer.
In practical applications, the first switch tube Q1 and the second switch tube Q2 may be both NMOS tubes; of course, the switch is not limited to this, and may be a triode, which is determined according to the specific application environment and the user's requirement, and the specific types of the first switch Q1 and the second switch Q2 are not specifically limited in this application, and all belong to the protection scope of this application.
It should be noted that, as shown in fig. 5, when a common-mode voltage signal appears on the lines of the dotted terminal and the dotted terminal of the secondary winding of the signal transformer, that is, when high levels appear on INN and INP in the figure at the same time, the dotted terminal of the secondary winding generates a corresponding current (I in the figure) on the second resistor R2 R2 ) (ii) a The different name end of the secondary winding generates corresponding current (I in the figure) on the first resistor R1 R1 ). Because the gates and the sources of the first switching tube Q1 and the second switching tube Q2 are shorted together to form a mirror circuit, at this time, the first switching tube Q1 and the second switching tube Q2 both work IN an amplification state, the second switching tube Q2 mirrors the same current flowing through the first switch Q1, and bypasses the current flowing through the second resistor R2, so that the signal voltage (VNP _ IN the figure) received by the non-inverting input terminal of the comparator IN the IGBT isolation driver is at a relatively low level and is lower than the reference voltage generated by the dc voltage source at the inverting input terminal of the comparator, thereby maintaining the output of the comparator at a low level.Wherein, I in the figure Q1 Represents the current, I, flowing through the first switching tube Q1 U1P And the common mode rejection unit 101 representing the dotted terminal of the secondary winding outputs current to the non-inverting input terminal of the corresponding comparator.
If the common-mode voltage signal does not appear on the circuit of the homonymous end and the heteronymous end of the secondary winding of the signal transformer, when the output of the homonymous end of the secondary winding of the signal transformer is high level and the output of the heteronymous end of the secondary winding of the signal transformer is low level; the current mapped on the second switching tube Q2 by the synonym end of the secondary winding of the signal transformer is very small, most of the current on the synonym end of the secondary winding of the signal transformer also flows into the non-inverting input end of the comparator in the IGBT isolation driver, the voltage received by the non-inverting input end of the comparator is greater than the reference voltage, and the comparator outputs high level.
And when the output of the homonymous end of the secondary winding of the signal transformer is at a low level and the output of the synonym end of the secondary winding of the signal transformer is at a high level. The current mapped by the synonym end of the secondary winding of the signal transformer on the second switch tube Q2 is large, most of the current on the synonym end of the secondary winding of the signal transformer can be bypassed, and when the voltage received by the non-inverting input end of the comparator in the IGBT isolation driver is lower than the reference voltage, the comparator outputs low level.
Referring also to fig. 4, the common mode rejection unit 102 of the different-name end of the secondary winding may include: a third resistor R3, a fourth resistor R4, a third switch tube Q3 and a fourth switch tube Q4. Wherein:
one end of the third resistor R3 is connected with the dotted terminal (INP in the figure) of the secondary winding of the signal transformer; the other end of the third resistor R3 is connected to the control terminal of the third switch transistor Q3, the second terminal of the third switch transistor Q3, and the control terminal of the fourth switch transistor Q4, respectively.
A first terminal of the third switching tube Q3 is connected to a first terminal of the fourth switching tube Q4, and is grounded.
A second end of the fourth switching tube Q4 is connected to the fourth resistor R4, and the connection point is connected to the non-inverting input terminal of the corresponding comparator in the IGBT isolation driver.
In practical applications, the respective comparators in the IGBT isolation driver to which the second terminal of the fourth switching tube Q4 and one terminal of the fourth resistor R4 are both connected may be U2 shown in fig. 3. The comparator is supplied with a comparison voltage, i.e. VNP _ IN the figure. Wherein the inverting input of the comparator provides a reference voltage (VREF in the figure) via a DC voltage source (DC in the figure).
The other end of the fourth resistor R4 is connected to the synonym terminal (INN in the figure) of the secondary winding of the signal transformer.
In practical application, the third switching tube Q3 and the fourth switching tube Q4 may be both NMOS tubes; of course, the present invention is not limited to this, and may also be a triode, which is determined according to the specific application environment and the user's requirement, and the specific types of the third switch tube Q3 and the fourth switch tube Q4 are not specifically limited in this application, and all belong to the protection scope of the present application.
In practical applications, the first switching tube Q1 and the second switching tube Q2 in the common mode rejection unit 101 at the same-name end of the secondary winding, and the third switching tube Q3 and the fourth switching tube Q4 in the common mode rejection unit 102 at the different-name end of the secondary winding are generally the same type of switching tube.
It should be noted that, as shown in fig. 6, when a common-mode voltage signal appears on the same-side and different-side lines of the secondary winding of the signal transformer, i.e., when high levels appear on INN and INP in the figure at the same time, the different-side line of the secondary winding generates a corresponding current (I in the figure) on the fourth resistor R4 R4 ) The dotted terminal of the secondary winding generates a corresponding current (I in the figure) in the third resistor R3 R3 ). Because the gates and the sources of the third switching tube Q3 and the fourth switching tube Q4 are shorted together to form a mirror circuit, the third switching tube Q3 and the fourth switching tube Q4 both work IN an amplification state at this time, the fourth switching tube Q4 maps the same current as that flowing through the third switching tube Q3, and bypasses the current of the fourth resistor R4, so that the signal voltage (VNN _ IN the figure) received by the non-inverting input terminal of the corresponding comparator IN the IGBT isolation driver is at a relatively low level and is lower than the reference voltage generated by the dc power supply at the inverting input terminal of the comparator, thereby maintaining the output of the comparator at a low level. Wherein, I Q3 To representThe current, I, flowing through the third switching tube Q3 U2P The common mode rejection unit 102, which represents the synonym terminal of the secondary winding, outputs a current to the non-inverting input terminal of the corresponding comparator.
If the common-mode voltage signal does not appear on the circuit of the homonymous end and the synonym end of the secondary winding of the signal transformer, when the output of the synonym end of the secondary winding of the signal transformer is at a high level and the output of the homonymous end of the secondary winding of the signal transformer is at a low level; the current mapped by the dotted terminal of the secondary winding of the signal transformer on the fourth switching tube Q4 is very small, most of the current on the dotted terminal of the secondary winding of the signal transformer also flows into the non-inverting input terminal of the comparator in the IGBT isolation driver, the non-inverting input terminal of the comparator receives a voltage greater than a reference voltage, and the comparator outputs a high level.
And when the output of the different-name end of the secondary winding of the signal transformer is at low level and the output of the same-name end of the secondary winding of the signal transformer is at high level. The current of the same-name end of the secondary winding of the signal transformer mapped on the fourth switching tube Q4 is large, most of the current on the different-name end of the secondary winding of the signal transformer can be bypassed, and when the voltage received by the same-phase input end of the comparator in the IGBT isolation driver is lower than the reference voltage, the comparator outputs low level.
It can be understood that when the homonymous end of the secondary winding and the synonym end of the secondary winding of the signal transformer are simultaneously in high level, a bypass current is generated at the homonymous end of the secondary winding, so that the output current of the synonym end of the secondary winding is reduced; a bypass current is generated at the different-name end of the secondary winding, so that the output current of the same-name end of the secondary winding is reduced, and the common-mode rejection effect is realized.
Based on the above principle, the common mode rejection circuit provided in this embodiment can bypass the common mode current at the homonymous end of the secondary winding and the heteronymous end of the secondary winding through the corresponding common mode rejection unit when the signal transformer generates the common mode voltage signal, so that the signal processing unit at the high-voltage side of the signal transformer is prevented from receiving two pulses with the same height, and the normal operation of the signal processing unit in the IGBT isolation driver is ensured.
In addition, when the homonymous pulse and the homonymous pulse appear at the homonymous end and the heteronymous end of the secondary winding of the signal transformer, the common-mode current is bypassed through the common-mode suppression unit by acquiring the voltage output by the homonymous end and the heteronymous end of the secondary winding of the signal transformer, and the circuit structure is simple.
In addition, the common mode rejection circuit provided by the application also widens the power supply range of the comparator, so that the comparator can normally work under a lower power supply voltage.
It should be noted that there is a control signal required for turning on and off the IGBT obtained by the comparator in the prior art, please refer to fig. 7, which can appropriately increase the reference threshold of the comparator to achieve a certain common mode rejection effect. However, the common mode rejection effect of this scheme is limited, some interference signals are large, and the common mode rejection effect is lost when the set threshold is exceeded. In addition, the common mode rejection is realized by increasing the reference threshold of the comparator, and the method cannot be applied to a scene with a relatively low supply voltage. The common mode rejection circuit provided by the application realizes common mode rejection in a mode of generating corresponding bypass current to bypass the common mode current, and has a better rejection effect; in addition, the common mode rejection effect cannot be lost when the interference signal is large and exceeds the set threshold, and the method is not limited by the use scene.
It is worth to be noted that another method exists in the prior art, in which a shielding layer is added on the high-voltage side and is connected with the reference ground of the high-voltage side, so as to achieve the shielding effect of the signal transformer; however, the winding difficulty of the signal transformer is increased by the method, and the transformer manufactured in the method is large in size, is not beneficial to miniaturization, and is generally only used on a power transformer to improve the EMC effect of the power transformer. According to the scheme provided by the application, the common mode rejection effect can be achieved by adding the simple common mode rejection circuit in the transformer, common mode rejection is achieved without increasing a shielding layer, the difficulty of achieving common mode rejection is reduced, and miniaturization of the signal transformer is facilitated.
It should be noted that the first end of the switching tube provided in this embodiment represents a source of the switching tube, that is, an end with an arrow in the drawing; the second end of the switch tube represents the drain electrode of the switch tube, namely the end without an arrow in the figure; the control end of the switching tube represents the grid electrode of the switching tube.
In practical applications, in addition to the specific manner shown in fig. 4, in another embodiment provided in the present application, referring to fig. 8, the common mode rejection unit 101 at the same-name end of the secondary winding may include:
the first operational amplifier OP1, the fifth resistor R5, the sixth resistor R6 and the fifth switch tube Q5; wherein:
the non-inverting input end + of the first operational amplifier OP1 is connected with the synonym terminal (INN in the figure) of the secondary winding of the signal transformer; an inverting input terminal of the first operational amplifier OP1 is connected to the output terminal of the first operational amplifier OP1 and one terminal of the fifth resistor R5.
The other end of the fifth resistor R5 is connected to the control end of the fifth switch Q5.
A second end of the fifth switch tube Q5 is connected to one end of the sixth resistor R6, and the connection point is connected to the non-inverting input terminal of the corresponding comparator in the IGBT isolation driver.
A first end of the fifth switch Q5 is grounded.
The other end of the sixth resistor R6 is connected to the dotted terminal (INP in the figure) of the secondary winding of the signal transformer.
In practical applications, the voltage signal at the synonym terminal of the secondary winding of the signal transformer can be converted into a corresponding current signal for bypassing through the first operational amplifier OP 1.
It should be noted that, when the common mode voltage signal appears on the same-name terminal and different-name terminal lines of the secondary winding of the signal transformer, that is, when high levels appear on INN and INP IN the figure at the same time, the output of the first operational amplifier OP1 turns on the fifth switching tube Q5, and bypasses the current on the sixth resistor R6 to ground, so that the signal voltage (VNP _ IN the figure) received by the non-inverting input terminal of the comparator IN the IGBT isolation driver is at a relatively low level and is lower than the reference voltage generated by the dc voltage source on the inverting input terminal of the comparator, thereby maintaining the output of the comparator at a low level.
Referring also to fig. 8, the common mode rejection unit 102 at the different-name end of the secondary winding may include:
a second operational amplifier OP2, a seventh resistor R7, an eighth resistor R8 and a sixth switch Q6; wherein:
the non-inverting input terminal + of the second operational amplifier OP2 is connected with the dotted terminal (INP in the figure) of the secondary winding of the signal transformer; the inverting input terminal of the second operational amplifier OP2 is connected to the output terminal of the second operational amplifier OP2 and one terminal of the seventh resistor R7, respectively.
The other end of the seventh resistor R7 is connected to the control end of the sixth switching tube Q6.
The second end of the sixth switching tube Q6 is connected to one end of the eighth resistor R8, and the connection point is connected to the non-inverting input terminal of the corresponding comparator in the IGBT isolation driver.
A first end of the sixth switching tube Q6 is grounded.
The other end of the eighth resistor R8 is connected to the synonym terminal (INN in the figure) of the secondary winding of the signal transformer.
In practical applications, the voltage signal at the dotted terminal of the secondary winding of the signal transformer can be converted into a corresponding current signal for bypassing through the second operational amplifier OP 2.
It should be noted that, when the common mode voltage signal appears on the same-name terminal and different-name terminal lines of the secondary winding of the signal transformer, that is, when high levels appear on INN and INP IN the figure at the same time, the output of the second operational amplifier OP2 turns on the sixth switching tube Q6, and bypasses the current on the eighth resistor R8 to ground, so that the signal voltage (VNP _ IN the figure) received by the non-inverting input terminal of the comparator IN the IGBT isolation driver is at a relatively low level and is lower than the reference voltage generated by the dc voltage source on the inverting input terminal of the comparator, thereby maintaining the output of the comparator at a low level.
It should be further noted that, the principle of converting the voltage signal on the dotted terminal or the dotted terminal of the secondary winding of the signal transformer into the corresponding current signal for bypassing by using the operational amplifier is the same as the principle shown in the above embodiments, and reference may be made to each other, and details are not repeated here.
It should be noted that the first end of the switch tube provided in this embodiment represents the emitter of the switch tube, i.e. the end with an arrow in the figure; the second end of the switch tube represents the collector of the switch tube, namely the end without an arrow in the figure; the control end of the switch tube represents the base electrode of the switch tube.
Optionally, another embodiment of the present application further provides an IGBT isolation driver, please refer to fig. 9, where the IGBT isolation driver mainly includes: a control unit 201, signal transformers (T1 and C1 and C2 in the figure), and a signal processing unit 203. Wherein:
the control unit 201 is configured to control the signal transformer to operate according to the received PWM signal.
The signal processing unit 203 is configured to control a corresponding comparator in the signal processing unit to output a corresponding signal according to the received signal output by the signal transformer.
The signal transformer is provided with the common mode rejection circuit according to any one of the above embodiments, and is used for controlling the comparator in the signal processing unit to output a low level when the common mode voltage signal appears.
It should be noted that, for the related description of the control unit 201, the signal transformer and the signal processing unit 203, reference may be made to the prior art, and details are not described herein again, and all of them belong to the protection scope of the present application. For a related description of the common mode rejection circuit, refer to the corresponding embodiments of fig. 3 to fig. 8, and are not repeated herein.
Optionally, another embodiment of the present application further provides a high-voltage inverter, please refer to fig. 10, which mainly includes: the controller 301, the IGBT power unit 302, and the IGBT isolation driver 303 according to the above embodiment, which is disposed between the controller 301 and the corresponding IGBT driving tube in the IGBT power unit 302.
The controller 301 is configured to issue a PWM signal to the IGBT isolation driver 303.
The IGBT isolation driver 303 is configured to control a corresponding IGBT driving tube in the IGBT power unit 302 to operate according to the received PWM signal.
In practical applications, the number of IGBT driving tubes in the IGBT power unit 302 may be 4, that is, a1, a2, A3, and a4 shown in the figure.
It should be noted that, for the relevant description of the controller 301 and the IGBT power unit 302, reference may be made to the prior art, and details are not described herein, and both belong to the protection scope of the present application. For the relevant description of the IGBT isolation driver 303, refer to the embodiment corresponding to fig. 9, and are not described herein again.
Features described in the embodiments in the present specification may be replaced with or combined with each other, and the same and similar portions among the embodiments may be referred to each other, and each embodiment is described with emphasis on differences from other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.

Claims (12)

1. A common mode rejection circuit for a signal transformer in an IGBT isolation driver, the common mode rejection circuit comprising: the common mode rejection unit of the homonymous end of the secondary winding and the common mode rejection unit of the synonym end of the secondary winding;
and the common mode rejection unit of the homonymous end of the secondary winding and the common mode rejection unit of the synonym end of the secondary winding are respectively used for bypassing the common mode currents on the homonymous end of the secondary winding and the synonym end of the secondary winding by taking the output level of a corresponding comparator connected with the common mode rejection unit in the IGBT isolation driver as a low control target when the signal transformer generates a common mode voltage signal.
2. A common-mode rejection circuit according to claim 1, wherein the common-mode rejection unit at the synonym terminal of the secondary winding and the common-mode rejection unit at the synonym terminal of the secondary winding have the same structure.
3. A common-mode rejection circuit according to claim 2, wherein the common-mode rejection unit of the secondary winding homonymous terminal comprises: the circuit comprises a first resistor, a second resistor, a first switching tube and a second switching tube; wherein:
one end of the first resistor is connected with the synonym end of the secondary winding of the signal transformer; the other end of the first resistor is respectively connected with the control end of the first switch tube, the second end of the first switch tube and the control end of the second switch tube;
the first end of the first switch tube is connected with the first end of the second switch tube and is grounded;
the second end of the second switch tube is connected with one end of the second resistor, and the connecting point is connected with the non-inverting input end of the corresponding comparator in the IGBT isolation driver;
and the other end of the second resistor is connected with the dotted end of the secondary winding of the signal transformer.
4. A common-mode rejection circuit according to claim 3, wherein said first switch tube and said second switch tube are both NMOS tubes or both triodes.
5. A common-mode rejection circuit according to claim 2, wherein the common-mode rejection unit of the different name end of the secondary winding comprises:
the third resistor, the fourth resistor, the third switching tube and the fourth switching tube; wherein:
one end of the third resistor is connected with the dotted end of the secondary winding of the signal transformer; the other end of the third resistor is connected with the control end of the third switching tube, the second end of the third switching tube and the control end of the fourth switching tube respectively;
the first end of the third switching tube is connected with the first end of the fourth switching tube and is grounded;
the second end of the fourth switching tube is connected with one end of the fourth resistor, and the connecting point is connected with the non-inverting input end of the corresponding comparator in the IGBT isolation driver;
the other end of the fourth resistor is connected with the synonym end of the secondary winding of the signal transformer.
6. The common mode rejection circuit according to claim 5, wherein said third switching tube and said fourth switching tube are both NMOS tubes or both triodes.
7. A common-mode rejection circuit according to claim 2, wherein the common-mode rejection unit of the secondary winding homonymous terminal comprises:
the first operational amplifier, the fifth resistor, the sixth resistor and the fifth switch tube; wherein:
the non-inverting input end of the first operational amplifier is connected with the different name end of the secondary winding of the signal transformer; the inverting input end of the first operational amplifier is connected with the output end of the first operational amplifier and one end of the fifth resistor;
the other end of the fifth resistor is connected with the control end of the fifth switching tube;
the second end of the fifth switching tube is connected with one end of the sixth resistor, and the connecting point is connected with the non-inverting input end of the corresponding comparator in the IGBT isolation driver;
the first end of the fifth switching tube is grounded;
and the other end of the sixth resistor is connected with the dotted end of the secondary winding of the signal transformer.
8. A common-mode rejection circuit according to claim 7, wherein said common-mode rejection unit of the synonym terminal of the secondary winding comprises:
the second operational amplifier, the seventh resistor, the eighth resistor and the sixth switching tube; wherein:
the non-inverting input end of the second operational amplifier is connected with the homonymous end of the secondary winding of the signal transformer; the inverting input end of the second operational amplifier is respectively connected with the output end of the second operational amplifier and one end of the seventh resistor;
the other end of the seventh resistor is connected with the control end of the sixth switching tube;
a second end of the sixth switching tube is connected with one end of the eighth resistor, and a connecting point is connected with a non-inverting input end of a corresponding comparator in the IGBT isolation driver;
the first end of the sixth switching tube is grounded;
and the other end of the eighth resistor is connected with the synonym end of the secondary winding of the signal transformer.
9. The common mode rejection circuit according to claim 8, wherein the fifth switching tube and the sixth switching tube are both NMOS tubes or both triodes.
10. An IGBT isolation driver, comprising: the device comprises a control unit, a signal transformer and a signal processing unit; wherein:
the control unit is used for controlling the signal transformer to work according to the received PWM signal;
the signal processing unit is used for controlling corresponding comparators in the signal processing unit to output corresponding signals according to the received signals output by the signal transformer;
the signal transformer is provided with a common mode rejection circuit according to any one of claims 1-9 for controlling the comparator in the signal processing unit to output a low level when a common mode voltage signal is present.
11. A high-voltage frequency converter, comprising: the IGBT isolation driver comprises a controller, IGBT power units and the IGBT isolation driver according to claim 10, wherein the IGBT isolation driver is arranged between the controller and corresponding IGBT driving tubes in the IGBT power units;
the controller is used for sending PWM signals to the IGBT isolation driver;
and the IGBT isolation driver is used for controlling corresponding IGBT driving tubes in the IGBT power unit to work according to the received PWM signal.
12. The high-voltage inverter according to claim 11, wherein the number of the IGBT driving tubes in the IGBT power unit is 4.
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