阅读说明：本技术 一种igbt驱动隔离电源的控制电路 (Control circuit of IGBT driving isolation power supply ) 是由 李军 何卫安 王文广 施贻蒙 徐晓彬 于 2021-10-08 设计创作，主要内容包括：本发明提供了一种IGBT驱动隔离电源的控制电路,该控制电路包括：数字稳压模块,所述数字稳压模块用于使输入至所述IGBT驱动隔离电源的门极的电压稳定在目标电压。也就是说,该控制电路可以保证使输入至所述IGBT驱动隔离电源的门极的开启电压和/或关断电压都可以稳定在所需的目标电压附近,以提高电源系统的可靠性。(The invention provides a control circuit of an Insulated Gate Bipolar Transistor (IGBT) driving isolation power supply, which comprises: and the digital voltage stabilizing module is used for stabilizing the voltage input to the gate pole of the IGBT driving isolation power supply at a target voltage. That is, the control circuit can ensure that the turn-on voltage and/or the turn-off voltage input to the gate of the IGBT driving isolation power supply can be stabilized to be close to the required target voltage, so that the reliability of the power supply system is improved.)

1. A control circuit for an IGBT-driven isolated power supply, the control circuit comprising:

and the digital voltage stabilizing module is used for stabilizing the voltage input to the gate pole of the IGBT driving isolation power supply at a target voltage.

2. The control circuit of claim 1, wherein the digital regulation module comprises: a first digital voltage stabilization unit for stabilizing a turn-on voltage input to a gate of the IGBT driving isolation power supply at a target voltage;

the first end of the first digital voltage stabilizing unit is connected with the first end of the voltage input end and is used as the output end of the starting voltage;

the second end of the first digital voltage stabilizing unit is connected with the voltage end of the emitter electrode;

and the third end of the first digital voltage stabilizing unit is connected with the first reference voltage input end.

3. The control circuit of claim 2, wherein the first digital voltage stabilization unit comprises: the circuit comprises a first resistor, a second resistor, a first comparator and a first transistor;

the first end of the first resistor and the first electrode end of the first transistor are both connected with the first end of the voltage input end and used as the output end of the starting voltage;

the second end of the first resistor is connected with the first end of the second resistor, and the connecting node is connected with the non-inverting input end of the first comparator;

a second end of the second resistor is connected with a second electrode end of the first transistor to serve as the emitter voltage end;

the inverting input end of the first comparator is connected with the first reference voltage input end;

the output end of the first comparator is connected with the grid control end of the first transistor.

4. The control circuit of claim 3, wherein the first digital voltage regulator block further comprises: a first ADC module;

the second end of the first resistor is connected with the first end of the second resistor, and a connection node is connected with the non-inverting input end of the first comparator through the first ADC module.

5. The control circuit of claim 2, wherein the digital voltage regulator module further comprises: a second digital voltage stabilization unit for stabilizing a turn-off voltage input to a gate of the IGBT driving isolation power supply at a target voltage;

the first end of the second digital voltage stabilizing unit is connected with the voltage end of the emitter electrode;

a second end of the second digital voltage stabilizing unit is connected with a second end of the voltage input end and is used as an output end of the turn-off voltage;

and the third end of the second digital voltage stabilizing unit is connected with a second reference voltage input end.

6. The control circuit of claim 5, wherein the second digital voltage regulator unit comprises: the circuit comprises a third resistor, a fourth resistor, a second comparator and a second transistor;

a first end of the third resistor is connected with a first electrode end of the second transistor to serve as the emitter voltage end;

the second end of the third resistor is connected with the first end of the fourth resistor, and the connecting node is connected with the non-inverting input end of the second comparator;

the inverting input end of the second comparator is connected with the second reference voltage input end;

the output end of the second comparator is connected with the grid control end of the second transistor;

and the second end of the fourth resistor and the second electrode end of the second transistor are both connected with the second end of the voltage input end and used as output ends of the turn-off voltage.

7. The control circuit of claim 6, wherein the second digital voltage regulator unit further comprises: a second ADC module;

the second end of the third resistor is connected with the first end of the fourth resistor, and a connection node is connected with the non-inverting input end of the second comparator through the second ADC module.

8. The control circuit of claim 5, further comprising: a first capacitor and a second capacitor;

the first end of the first capacitor is connected with the first end of the voltage input end and is used as the output end of the starting voltage;

the second end of the first capacitor is connected with the first end of the second capacitor, and a connection node is used as the voltage end of the emitter;

and the second end of the second capacitor is connected with the second end of the voltage input end and is used as the output end of the turn-off voltage.

9. The control circuit of claim 5, wherein the output terminal of the turn-on voltage is connected to the gate of the IGBT drive isolation power supply through a third transistor;

and the output end of the turn-off voltage is connected with the gate electrode of the IGBT driving isolation power supply through a fourth transistor.

10. The control circuit of claim 1, further comprising: the transformer comprises a conversion circuit, an isolation transformer and a rectification circuit;

the conversion circuit is used for converting an input voltage into a first voltage;

the isolation transformer is used for transforming the first voltage to a second voltage;

the rectifying circuit is used for rectifying the second voltage into direct current voltage and outputting the direct current voltage to the digital voltage stabilizing module.

Technical Field

The invention relates to the technical field of electronic circuits, in particular to a control circuit of an Insulated Gate Bipolar Transistor (IGBT) driving isolation power supply.

Background

An Insulated Gate Bipolar Transistor (IGBT) is one of typical High Voltage Integrated Circuits (HVIC), and is widely used in household appliances, industrial equipment, aviation, aerospace, and weapon systems due to its High reliability, small area, and High effect.

However, the static power consumption of the IGBT driving isolation power supply is high at present, and the efficiency is low; in addition, the IGBT drives the switch of the isolation power supply to instantly flow large pulse current through the power supply loop, so that the reliability of the power supply system is reduced.

Disclosure of Invention

In view of the above, in order to solve the above problems, the present invention provides a control circuit for an IGBT driving isolated power supply, and the technical scheme is as follows:

a control circuit for an IGBT driven isolated power supply, the control circuit comprising:

and the digital voltage stabilizing module is used for stabilizing the voltage input to the gate pole of the IGBT driving isolation power supply at a target voltage.

Preferably, in the control circuit, the digital voltage stabilizing module includes: a first digital voltage stabilization unit for stabilizing a turn-on voltage input to a gate of the IGBT driving isolation power supply at a target voltage;

the first end of the first digital voltage stabilizing unit is connected with the first end of the voltage input end and is used as the output end of the starting voltage;

the second end of the first digital voltage stabilizing unit is connected with the voltage end of the emitter electrode;

and the third end of the first digital voltage stabilizing unit is connected with the first reference voltage input end.

Preferably, in the control circuit, the first digital voltage stabilization unit includes: the circuit comprises a first resistor, a second resistor, a first comparator and a first transistor;

the first end of the first resistor and the first electrode end of the first transistor are both connected with the first end of the voltage input end and used as the output end of the starting voltage;

the second end of the first resistor is connected with the first end of the second resistor, and the connecting node is connected with the non-inverting input end of the first comparator;

a second end of the second resistor is connected with a second electrode end of the first transistor to serve as the emitter voltage end;

the inverting input end of the first comparator is connected with the first reference voltage input end;

the output end of the first comparator is connected with the grid control end of the first transistor.

Preferably, in the control circuit, the first digital voltage stabilizing unit further includes: a first ADC module;

the second end of the first resistor is connected with the first end of the second resistor, and a connection node is connected with the non-inverting input end of the first comparator through the first ADC module.

Preferably, in the above control circuit, the digital voltage regulator module further includes: a second digital voltage stabilization unit for stabilizing a turn-off voltage input to a gate of the IGBT driving isolation power supply at a target voltage;

the first end of the second digital voltage stabilizing unit is connected with the voltage end of the emitter electrode;

a second end of the second digital voltage stabilizing unit is connected with a second end of the voltage input end and is used as an output end of the turn-off voltage;

and the third end of the second digital voltage stabilizing unit is connected with a second reference voltage input end.

Preferably, in the control circuit, the second digital voltage stabilization unit includes: the circuit comprises a third resistor, a fourth resistor, a second comparator and a second transistor;

a first end of the third resistor is connected with a first electrode end of the second transistor to serve as the emitter voltage end;

the second end of the third resistor is connected with the first end of the fourth resistor, and the connecting node is connected with the non-inverting input end of the second comparator;

the inverting input end of the second comparator is connected with the second reference voltage input end;

the output end of the second comparator is connected with the grid control end of the second transistor;

and the second end of the fourth resistor and the second electrode end of the second transistor are both connected with the second end of the voltage input end and used as output ends of the turn-off voltage.

Preferably, in the control circuit, the second digital voltage stabilizing unit further includes: a second ADC module;

the second end of the third resistor is connected with the first end of the fourth resistor, and a connection node is connected with the non-inverting input end of the second comparator through the second ADC module.

Preferably, in the control circuit, the control circuit further includes: a first capacitor and a second capacitor;

the first end of the first capacitor is connected with the first end of the voltage input end and is used as the output end of the starting voltage;

the second end of the first capacitor is connected with the first end of the second capacitor, and a connection node is used as the voltage end of the emitter;

and the second end of the second capacitor is connected with the second end of the voltage input end and is used as the output end of the turn-off voltage.

Preferably, in the control circuit, an output end of the turn-on voltage is connected to a gate of the IGBT driving isolation power supply through a third transistor;

and the output end of the turn-off voltage is connected with the gate electrode of the IGBT driving isolation power supply through a fourth transistor.

Preferably, in the control circuit, the control circuit further includes: the transformer comprises a conversion circuit, an isolation transformer and a rectification circuit;

the conversion circuit is used for converting an input voltage into a first voltage;

the isolation transformer is used for transforming the first voltage to a second voltage;

the rectifying circuit is used for rectifying the second voltage into direct current voltage and outputting the direct current voltage to the digital voltage stabilizing module.

Compared with the prior art, the invention has the following beneficial effects:

the invention provides a control circuit of an IGBT driving isolation power supply, which comprises: and the digital voltage stabilizing module is used for stabilizing the voltage input to the gate pole of the IGBT driving isolation power supply at a target voltage. The control circuit can ensure that the turn-on voltage and/or the turn-off voltage input to the gate of the IGBT driving isolation power supply can be stabilized to be close to the required target voltage, so that the reliability of the power supply system is improved.

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 control circuit of an IGBT driving isolation power supply according to an embodiment of the present invention;

fig. 2 is a schematic circuit structure diagram of a control circuit of an IGBT driving isolation power supply according to an embodiment of the present invention;

fig. 3 is a schematic circuit structure diagram of another control circuit for driving an isolated power supply by an IGBT according to an embodiment of the present invention;

fig. 4 is a schematic circuit structure diagram of a control circuit of another IGBT driving isolated power supply according to an embodiment of the present invention;

fig. 5 is a schematic diagram illustrating an operating principle of a first digital voltage regulation unit according to an embodiment of the present invention;

fig. 6 is a schematic circuit structure diagram of a control circuit of another IGBT driving isolated power supply according to an embodiment of the present invention;

fig. 7 is a schematic circuit structure diagram of a control circuit of another IGBT driving isolated power supply according to an embodiment of the present invention;

fig. 8 is a schematic circuit structure diagram of a control circuit of another IGBT driving isolated power supply according to an embodiment of the present invention.

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.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a control circuit of an IGBT driving isolation power supply according to an embodiment of the present invention.

The control circuit includes:

and the digital voltage stabilizing module is used for stabilizing the voltage input to the gate pole of the IGBT driving isolation power supply at a target voltage.

Optionally, as shown in fig. 1, the digital voltage stabilizing module includes: and the first digital voltage stabilizing unit 11, wherein the first digital voltage stabilizing unit 11 is configured to stabilize the turn-on voltage VP input to the gate of the IGBT driving isolation power supply at a target voltage.

A first end of the first digital voltage stabilization unit 11 is connected to a first end of a voltage input terminal VDD, and serves as an output terminal of the turn-on voltage VP.

A second terminal of the first digital voltage stabilization unit 11 is connected to the emitter voltage terminal VE.

The third terminal of the first digital voltage regulation unit 11 is connected to a first reference voltage input terminal Vref 1.

Optionally, as shown in fig. 1, the digital voltage stabilizing module further includes: a second digital voltage stabilization unit 12, wherein the second digital voltage stabilization unit 12 is configured to stabilize the off-voltage VN input to the gate of the IGBT driving isolation power supply at the target voltage.

A first terminal of the second digital voltage stabilization unit 12 is connected to the emitter voltage terminal VE.

A second terminal of the second digital voltage stabilizing unit 12 is connected to a second terminal of the voltage input terminal VDD, and serves as an output terminal of the off-voltage VN.

The third terminal of the second digital voltage regulation unit 12 is connected to a second reference voltage input terminal Vref 2.

In this embodiment, the control circuit can ensure that the turn-on voltage VP and/or the turn-off voltage VN input to the gate of the IGBT driving isolation power supply can be stabilized around the required target voltage through the digital voltage stabilizing module, so as to improve the reliability of the power supply system.

Optionally, in another embodiment of the present invention, referring to fig. 2, fig. 2 is a schematic circuit structure diagram of a control circuit of an IGBT driving isolation power supply according to an embodiment of the present invention.

The first digital voltage stabilization unit 11 includes: the circuit comprises a first resistor R1, a second resistor R2, a first comparator D1 and a first transistor Q1.

A first terminal of the first resistor R1 and a first electrode terminal of the first transistor Q1 are both connected to a first terminal of the voltage input terminal VDD, and serve as output terminals of the turn-on voltage VP.

The second end of the first resistor R1 is connected to the first end of the second resistor R2, and a connection node is connected to the non-inverting input of the first comparator D1.

A second end of the second resistor R2 is connected to a second electrode of the first transistor Q1 as the emitter voltage terminal VE.

An inverting input of the first comparator D1 is connected to the first reference voltage input Vref 1.

The output terminal of the first comparator D1 is connected to the gate control terminal of the first transistor Q1.

The second digital voltage stabilization unit 12 includes: a third resistor R3, a fourth resistor R4, a second comparator D2 and a second transistor Q2;

a first end of the third resistor R3 is connected to a first electrode end of the second transistor Q2 as the emitter voltage end VE;

a second end of the third resistor R3 is connected with a first end of the fourth resistor R4, and a connection node is connected with a non-inverting input terminal of the second comparator D2;

an inverting input of the second comparator D2 is connected to the second reference voltage input Vref 2;

the output end of the second comparator D2 is connected with the gate control end of the second transistor Q2;

a second end of the fourth resistor R4 and a second electrode of the second transistor Q2 are both connected to a second end of the voltage input terminal VDD, and serve as output terminals of the off-voltage VN.

Optionally, referring to fig. 3, fig. 3 is a schematic circuit structure diagram of another control circuit for driving an isolated power supply by an IGBT according to an embodiment of the present invention.

The first digital voltage stabilization unit 11 further includes: a first ADC block 13.

The second end of the first resistor R1 is connected to the first end of the second resistor R2, and the connection node is connected to the non-inverting input terminal of the first comparator D1 through the first ADC block 13.

Optionally, referring to fig. 4, fig. 4 is a schematic circuit structure diagram of a control circuit of another IGBT driving isolation power supply according to an embodiment of the present invention.

The second digital voltage stabilizing unit 12 further includes: a second ADC block 14.

The second end of the third resistor R3 is connected to the first end of the fourth resistor R4, and the connection node is connected to the non-inverting input of the second comparator D2 through the second ADC block 14.

In this embodiment, referring to fig. 5, fig. 5 is a schematic diagram of an operating principle of a first digital voltage stabilizing unit according to an embodiment of the present invention, as shown in fig. 5, a hysteresis control method is adopted in a manner of stabilizing a turn-on voltage, specifically:

the first ADC module 13 detects the voltage at the output terminal of the turn-on voltage, compares the voltage with a reference voltage at the first comparator D1, turns on the first transistor Q1 when the output voltage VP is greater than or equal to Vref1 +/Δ V/2, and turns off the first transistor Q1 when the output voltage VP is less than or equal to Vref1- Δ V/2, so as to ensure that the VP output voltage is stable and the output ripple is not greater than Δ V.

The principle of the manner of stabilizing the turn-off voltage is the same as that of stabilizing the turn-on voltage, and is not described herein again.

Optionally, in another embodiment of the present invention, referring to fig. 6, fig. 6 is a schematic circuit structure diagram of a control circuit of another IGBT driving isolation power supply provided in the embodiment of the present invention.

The control circuit further includes: a first capacitor C1 and a second capacitor C2;

a first end of the first capacitor C1 is connected to a first end of the voltage input terminal VDD, and serves as an output end of the start-up voltage VP;

a second end of the first capacitor C1 is connected with a first end of the second capacitor C2, and a connection node is used as the emitter voltage end VE;

a second terminal of the second capacitor C2 is connected to a second terminal of the voltage input terminal VDD as an output terminal of the off-voltage VN.

Optionally, in another embodiment of the present invention, referring to fig. 7, fig. 7 is a schematic circuit structure diagram of a control circuit of another IGBT driving isolated power supply according to the embodiment of the present invention.

The output terminal of the turn-on voltage VP is connected to the gate G of the IGBT drive isolation power supply through a third transistor Q3.

The output end of the off-voltage VN is connected with the gate G of the IGBT driving isolation power supply through a fourth transistor Q4.

Optionally, in another embodiment of the present invention, referring to fig. 8, fig. 8 is a schematic circuit structure diagram of a control circuit of another IGBT driving isolation power supply provided in the embodiment of the present invention.

The control circuit further includes: a conversion circuit 15, an isolation transformer 16 and a rectification circuit 17.

The converting circuit 15 is used for converting the input voltage Vin into a first voltage.

The isolation transformer 16 is used for transforming the first voltage to a second voltage.

The rectifying circuit 17 is configured to rectify the second voltage into a dc voltage, and output the dc voltage to the digital voltage stabilizing module.

In the embodiment, the input voltage Vin transfers energy from a primary side to a secondary side through the isolation transformer by the conversion circuit, namely, the conversion from the input voltage to the second voltage is realized; further, the second voltage is processed through the rectifying circuit to obtain a direct current voltage VDD which is used as a voltage input end of the digital voltage stabilizing module.

The digital voltage stabilizing module regulates the duty ratio of the internal first transistor Q1 by sampling the voltage between VP and VE, and stabilizes the output of the turn-on voltage VP, for example, stabilizing the output voltage VP to 15V, as the turn-on voltage VP of the IGBT driving isolation power supply.

The total voltage VDD minus the VP voltage can yield the turn-off voltage VN.

Optionally, the digital voltage regulation module may also regulate the duty cycle of the internal second transistor Q2 using the voltage between VN and VE to stabilize the output of the off-voltage VN.

The digital voltage stabilizing module has low static power consumption, realizes high efficiency of a voltage stabilizing power supply and reduces heat loss; through adjusting the response loop of the digital voltage stabilizing module, the IGBT generates instantaneous voltage drop when driving the isolation power switch, and the digital voltage stabilizing power supply does not make quick response, so that overlarge pulse current cannot flow in the stable power supply, and the reliability of a power supply system is improved.

The control circuit of the IGBT driving isolation power supply provided by the present invention is described in detail above, and a specific example is applied in the present disclosure to explain the principle and the implementation of the present invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

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 or 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 a process, method, article, or apparatus that comprises the element.

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.