IGBT driving power supply circuit and frequency converter

Abstract

The utility model relates to an IGBT driving power supply circuit and a frequency converter, and relates to the IGBT driving technology field, the IGBT driving power supply circuit comprises a driving power supply output unit, a rectification unit and an output voltage stabilization unit; the driving power supply output unit is connected with the rectification unit, the rectification unit is connected with the output voltage stabilization unit, and the output voltage stabilization unit is connected with an IGBT and used for outputting positive power supply reference voltage and negative power supply reference voltage to the IGBT. Alternating current voltage output by the driving power supply output unit can be rectified into direct current voltage through the rectifying unit, so that voltage fluctuation is reduced, and the stability of driving voltage is improved; furthermore, positive power supply reference voltage and negative power supply reference voltage required for switching on and switching off the IGBT can be stably generated through an output voltage stabilizing unit, so that reliable switching on and switching off of the IGBT can be effectively ensured, heating of the IGBT is reduced, and the loading capacity of the IGBT is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to IGBT drive technical field especially relates to a kind of IGBT drive power supply circuit and frequency converter. BACKGROUND

[0002] Insulated Gate Bipolar Transistor (IGBT) switching device is important power device in frequency converter, has quite extensive use in many high-power rectification, inverter, chopper etc.

[0003] In high-power frequency converter, usually use negative voltage to provide IGBT with turn-off negative voltage, use positive voltage to provide turn-on positive voltage.

[0004] Power IGBT drive power supply technology generally selects flyback or forward topology, with the increase of IGBT gate drive power, how to realize the reliable conduction and turn-off drive of IGBT, become the technical problem that this field needs to solve urgently. UTILITY MODEL CONTENTS

[0005] The utility model provides a kind of IGBT drive power supply circuit and frequency converter to solve the technical problems, such as IGBT driving stability in prior art is poor, cannot realize reliable conduction and turn-off, lead to IGBT heat seriously, weak load capacity.

[0006] First, the utility model provides a kind of IGBT drive power supply circuit, including drive power output unit, rectifier unit and output voltage stabilizing unit;The drive power output unit is connected with the rectifier unit, and the rectifier unit is connected with the output voltage stabilizing unit, wherein the output voltage stabilizing unit is connected with IGBT, for outputting positive power reference voltage and negative power reference voltage to the IGBT.

[0007] Further technical solutions thereof are that the drive power output unit includes square wave generation unit, signal amplification unit and isolation unit;The square wave generation unit is connected with the signal amplification unit, and the signal amplification unit is connected with the isolation unit, and the isolation unit is connected with the rectifier unit.

[0008] Further technical solutions thereof are that the output voltage stabilizing unit includes voltage stabilizing tube and first resistance, the negative pole of the voltage stabilizing tube is connected with the rectifier unit and the IGBT, and the positive pole of the voltage stabilizing tube is connected with the first resistance, and the first resistance is connected with the rectifier unit and the IGBT.

[0009] Further technical solutions thereof are that the output voltage stabilizing unit further includes first capacitor and second capacitor, and the first capacitor is connected with the voltage stabilizing tube in parallel, and the second capacitor is connected with the first resistance in parallel.

[0010] Further, the rectifier unit comprises a first diode, a second diode, a third diode and a fourth diode, the positive electrode of the first diode is connected with the driving power output unit and the negative electrode of the second diode, the negative electrode of the first diode is connected with the output voltage stabilizing unit; the positive electrode of the second diode is connected with the positive electrode of the fourth diode and the output voltage stabilizing unit; the negative electrode of the fourth diode is connected with the positive electrode of the third diode and the driving power output unit, and the negative electrode of the third diode is connected with the output voltage stabilizing unit.

[0011] Further, the rectifier unit further comprises a third capacitor, and the third capacitor is connected with the negative electrode of the third diode and the positive electrode of the fourth diode respectively.

[0012] Further, the square wave generating unit comprises a timer chip, a second resistor, a third resistor and a fourth capacitor, the timer chip comprises a threshold pin, a discharge pin, a trigger pin, a power pin and an output pin; the second resistor is connected with the power pin and the discharge pin, the third resistor is connected with the threshold pin and the second resistor, one end of the fourth capacitor is connected with the trigger pin and the threshold pin, the other end of the fourth capacitor is grounded, and the output pin is connected with the signal amplifying unit.

[0013] Further, the signal amplifying unit comprises a half-bridge chip, the input end of the half-bridge chip is connected with the square wave generating unit, and the input end of the half-bridge chip is connected with the isolation unit.

[0014] Further, the isolation unit comprises a transformer and a fifth capacitor, the fifth capacitor is connected with the signal amplifying unit and the primary side of the transformer, and the secondary side of the transformer is connected with the rectifier unit.

[0015] In the second aspect, the utility model provides a frequency converter, the frequency converter includes IGBT drive power supply circuit as described in first aspect.

[0016] Compared with the prior art, the above technical scheme provided by the utility model has the following advantages:

[0017] The utility model embodiment, IGBT drive power supply circuit includes drive power output unit, rectifier unit and output voltage stabilizing unit, drive power output unit with rectifier unit is connected, rectifier unit with output voltage stabilizing unit is connected, wherein, output voltage stabilizing unit is connected with IGBT, for to IGBT output positive power reference voltage and negative power reference voltage, through rectifier unit can rectify the alternating voltage of drive power output unit output as direct current voltage, thereby reduce voltage fluctuation, improve the stability of drive voltage, further, through output voltage stabilizing unit, can stably produce the positive power reference voltage and negative power reference voltage needed for IGBT opening and closing, thereby can effectively ensure that IGBT can reliably turn on and turn off, reduce the heat of IGBT and improve the carrying capacity of IGBT. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present utility model and, together with the description, serve to explain the principles of the present utility model.

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model or the prior art, the accompanying drawings needed to be used in the embodiment or prior art description will be briefly introduced below, and obviously, other drawings can also be obtained by those skilled in the art without creative labor under the premise of not paying the creative labor.

[0020] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings, and these exemplary illustrations do not constitute a limitation on the embodiments, and the elements with the same reference numerals in the drawings represent similar elements, unless otherwise specified, and the drawings do not constitute a proportional limitation.

[0021] Fig. 1 A circuit block diagram of an IGBT drive power supply circuit provided for the utility model embodiment is provided.

[0022] Fig. 2 A circuit principle diagram of an IGBT drive power supply circuit provided for the utility model embodiment is provided.

[0023] Marking of the drawings:

[0024] The driving power output unit 10, the rectifier unit 20, the output voltage stabilizing unit 30, the square wave generating unit 11, the signal amplifying unit 12, the isolation unit 13, the voltage stabilizing tube Z1, the first resistor R3, the first capacitor C6, the second capacitor C7, the first diode D1, the second diode D2, the third diode D3, the fourth diode D4, the third capacitor C5, the timer chip U1, the second resistor R1, the third resistor R2, the fourth capacitor C1, the threshold pin THRES, the discharge pin DISCH, the trigger pin TRIG, the power supply pin VCC, the output pin OUT, the half-bridge chip U2, the transformer T1, the fifth capacitor C4. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0026] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplicity, the elements and settings of particular examples in the following description are described in some instances. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application can repeat reference numerals and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and / or settings discussed.

[0027] For the purpose of description, spatial relative terms as shown in the drawings can be used to describe the relative position relationship or movement condition of one element or feature relative to another element or feature, such as "internal", "external", "inboard", "outboard", "under", "below", "on", "above", "front", "back", and the like. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is flipped over or the posture is changed or the movement state is changed, the directional indications will also change accordingly, for example: the element described as "under" or "below" another element or feature will be oriented as "above" or "above" another element or feature. Therefore, the example term "below" can include both the up and down positions. The device can be additionally oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are interpreted accordingly.

[0028] In order to solve the technical problems of poor stability of IGBT drive, unable to realize reliable turn-on and turn-off drive, leading to serious IGBT heating and weak load carrying capacity in the prior art, the utility model provides an IGBT drive power supply circuit, can realize reliable turn-on and turn-off drive of IGBT.

[0029] Refer to Figs. 1-2 The utility model embodiment provides an IGBT drive power supply circuit, the IGBT drive power supply circuit includes drive power output unit 10, rectifier unit 20 and output voltage stabilizing unit 30, and the specific structure is introduced as follows:

[0030] Drive power output unit 10 is used to output the drive voltage of IGBT, and drive power output unit 10 is connected with rectifier unit 20. Rectifier unit 20 is used to rectify the alternating voltage output by drive power output unit 10 into direct current voltage, thereby reducing voltage fluctuation and improving the stability of drive voltage. Rectifier unit 20 is connected with output voltage stabilizing unit 30, and output voltage stabilizing unit 30 is connected with IGBT. Output voltage stabilizing unit 30 is used to output positive power reference voltage and negative power reference voltage to IGBT. Through output voltage stabilizing unit 30, the positive power reference voltage and negative power reference voltage required for IGBT turn-on and turn-off can be stably generated, thereby effectively ensuring that IGBT can be reliably turned on and turned off, reducing IGBT heating and improving IGBT load carrying capacity.

[0031] In the utility model embodiment, the IGBT drive power supply circuit includes drive power output unit 10, rectifier unit 20 and output voltage stabilizing unit 30; drive power output unit 10 is connected with rectifier unit 20, and rectifier unit 20 is connected with output voltage stabilizing unit 30. Output voltage stabilizing unit 30 is connected with IGBT and is used to output positive power reference voltage and negative power reference voltage to IGBT. Through rectifier unit 20, the alternating voltage output by drive power output unit 10 can be rectified into direct current voltage, thereby reducing voltage fluctuation and improving the stability of drive voltage. Further, through output voltage stabilizing unit 30, the positive power reference voltage and negative power reference voltage required for IGBT turn-on and turn-off can be stably generated, thereby effectively ensuring that IGBT can be reliably turned on and turned off, reducing IGBT heating and improving IGBT load carrying capacity.

[0032] Further, in some embodiments, for example in the embodiment, the driving power output unit 10 comprises a square wave generating unit 11, a signal amplifying unit 12 and an isolation unit 13; the square wave generating unit 11 is connected with the signal amplifying unit 12, the signal amplifying unit 12 is connected with the isolation unit 13, and the isolation unit 13 is connected with the rectifying unit 20. Specifically, the square wave generating unit 11 is configured to generate a PWM signal. The signal amplifying unit 12 is configured to amplify the PWM signal to improve the driving capability. The isolation unit 13 is configured to transmit the PWM signal in an isolated manner to improve the safety.

[0033] Specifically, in the embodiment, the square wave generating unit 11 comprises a timer chip U1, a second resistor R1, a third resistor R2 and a fourth capacitor C1; the timer chip U1 comprises a threshold pin THRES, a discharge pin DISCH, a trigger pin TRIG, a power supply pin VCC and an output pin OUT; the second resistor R1 is connected with the power supply pin VCC and the discharge pin DISCH, the third resistor R2 is connected with the threshold pin THRES and the second resistor R1, one end of the fourth capacitor C1 is connected with the trigger pin TRIG and the threshold pin THRES, the other end of the fourth capacitor C1 is grounded, and the output pin OUT is connected with the signal amplifying unit 12.

[0034] In specific implementation, the timer chip U1 is configured to generate a PWM signal, and the second resistor R1, the third resistor R2 and the fourth capacitor C1 are configured to configure the frequency and duty cycle of the PWM signal generated by the timer chip U1. Further, the power supply pin VCC of the timer chip U1 is grounded through a first filter capacitor C2, and the control pin CONT of the timer chip U1 is grounded through a second filter capacitor C3; the first filter capacitor C2 and the second filter capacitor C3 play a filtering role to improve the stability of the circuit.

[0035] Specifically, in the embodiment, the signal amplifying unit 12 comprises a half-bridge chip U2, an input end of the half-bridge chip U2 is connected with the square wave generating unit 11, and an input end of the half-bridge chip U2 is connected with the isolation unit 13.

[0036] In specific implementation, the input end of the half-bridge chip U2 is connected with the output pin OUT of the timer chip U1. The half-bridge chip U2 can amplify the PWM signal output by the timer chip U1.

[0037] Specifically, in the embodiment, the isolation unit 13 comprises a transformer T1 and a fifth capacitor C4, the fifth capacitor C4 is connected with the signal amplification unit 12 and the primary side of the transformer T1, and the secondary side of the transformer T1 is connected with the rectification unit 20.

[0038] In specific implementation, the fifth capacitor C4 plays a role of energy storage. One end of the fifth capacitor C4 is connected with the input end of the half-bridge chip U2, and the other end of the fifth capacitor C4 is connected with the primary side of the transformer T1. The transformer T1 plays a role of signal isolation transmission, thereby improving safety.

[0039] Further, in some embodiments, for example, the embodiment, the rectification unit 20 comprises a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, the positive electrode of the first diode D1 is connected with the driving power output unit 10 and the negative electrode of the second diode D2, the negative electrode of the first diode D1 is connected with the output voltage stabilizing unit 30; the positive electrode of the second diode D2 is connected with the positive electrode of the fourth diode D4 and the output voltage stabilizing unit 30; the negative electrode of the fourth diode D4 is connected with the positive electrode of the third diode D3 and the driving power output unit 10, and the negative electrode of the third diode D3 is connected with the output voltage stabilizing unit 30.

[0040] In specific implementation, the positive electrode of the first diode D1 is connected with the secondary side of the transformer T1, and the negative electrode of the fourth diode D4 is connected with the secondary side of the transformer T1. The negative electrode of the first diode D1 is connected with the negative electrode of the voltage stabilizing tube Z1, the positive electrode of the second diode is connected with the first resistor R3, and the negative electrode of the third diode D3 is connected with the negative electrode of the voltage stabilizing tube Z1.

[0041] Further, the rectification unit 20 further comprises a third capacitor C5, the third capacitor C5 is connected with the negative electrode of the third diode D3 and the positive electrode of the fourth diode D4 respectively. The third capacitor C5 plays a role of energy storage.

[0042] Further, in some embodiments, for example, the embodiment, the output voltage stabilizing unit 30 comprises a voltage stabilizing tube Z1 and a first resistor R3, the negative electrode of the voltage stabilizing tube Z1 is connected with the rectification unit 20 and the IGBT, the positive electrode of the voltage stabilizing tube Z1 is connected with the first resistor R3, and the first resistor R3 is connected with the rectification unit 20 and the IGBT. In specific implementation, one end of the third capacitor C5 is connected with the negative electrode of the voltage stabilizing tube Z1, and the other end of the third capacitor C5 is connected with the first resistor R3.

[0043] Further, the output voltage stabilizing unit 30 further comprises a first capacitor C6 and a second capacitor C7, the first capacitor C6 is connected in parallel with the voltage stabilizing tube Z1, and the second capacitor C7 is connected in parallel with the first resistor R3.

[0044] The working process of the above IGBT driving power supply circuit comprises the following two stages:

[0045] The first stage: after the timer chip U1 of the square wave generating unit 11 is powered on and works, a fixed frequency PWM signal is generated. When the PWM signal output by the square wave generating unit 11 is at a high level, the output end of the half-bridge chip U2 is at a high level, the fifth capacitor C4 supplies power to the primary winding (the original side) of the transformer T1, the forward current flows through the primary winding, and the induced current is generated on the secondary winding (the secondary side) of the transformer T1, the first diode D1 and the fourth diode D4 start to conduct in the forward direction and output energy to the third capacitor C5, so as to maintain the stability of the output voltage.

[0046] The second stage: when the PWM signal output by the square wave generating unit 11 is at a low level, the output end of the half-bridge chip U2 is at a low level, the fifth capacitor C4 supplies power to the primary winding of the transformer T1, the reverse current flows through the primary winding, and the corresponding induced current is generated on the secondary winding of the transformer T1, the second diode D2 and the third diode D3 start to conduct in the forward direction and output energy to the third capacitor C5, so as to maintain the stability of the output voltage. After this working stage is completed, the working process will transit back to the first stage.

[0047] In the working process of the power supply, the voltage stabilizing tube Z1 and the first resistor R3 output the positive power reference voltage VCC_1 and the negative power reference voltage VEE_1 required for IGBT driving, and the first capacitor C6 and the second capacitor C7 support and filter the output voltage.

[0048] The utility model embodiment provides a frequency converter, the frequency converter includes the IGBT driving power supply circuit provided by any one of the above embodiments.

[0049] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0050] In the description of the utility model, it is understood that the directions or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are the directions or positional relationships shown based on the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0051] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0052] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0053] In the utility model, unless otherwise specifically defined and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or the indirect contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical direction of the first feature above and oblique above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include the vertical direction of the first feature below and oblique below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0054] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present specification.

[0055] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, these modifications and variations of the present application are intended to be included within the scope of the claims of the present application and equivalents thereof. Therefore, the present application is intended to include these modifications and variations.

[0056] The above is a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An IGBT driving power supply circuit characterized by comprising: The IGBT driving power supply circuit comprises a driving power output unit, a rectifier unit and an output voltage stabilizing unit; the driving power output unit is connected with the rectifier unit, and the rectifier unit is connected with the output voltage stabilizing unit; the output voltage stabilizing unit is connected with an IGBT, and is used for outputting a positive power reference voltage and a negative power reference voltage to the IGBT.

2. The IGBT driver power supply circuit according to claim 1, characterized by, The driving power output unit comprises a square wave generating unit, a signal amplifying unit and an isolation unit; the square wave generating unit is connected with the signal amplifying unit, and the signal amplifying unit is connected with the isolation unit; the isolation unit is connected with the rectifier unit.

3. The IGBT driver power supply circuit according to claim 1, characterized by, The output voltage stabilizing unit comprises a voltage stabilizing tube and a first resistor; a negative electrode of the voltage stabilizing tube is connected with the rectifier unit and the IGBT; a positive electrode of the voltage stabilizing tube is connected with the first resistor; and the first resistor is connected with the rectifier unit and the IGBT.

4. The IGBT driver power supply circuit according to claim 3, characterized by, The output voltage stabilizing unit further comprises a first capacitor and a second capacitor; the first capacitor is connected with the voltage stabilizing tube in parallel; and the second capacitor is connected with the first resistor in parallel.

5. The IGBT driver power supply circuit according to claim 1, characterized by, The rectifier unit comprises a first diode, a second diode, a third diode and a fourth diode; a positive electrode of the first diode is connected with the driving power output unit and a negative electrode of the second diode; a negative electrode of the first diode is connected with the output voltage stabilizing unit; a positive electrode of the second diode is connected with a positive electrode of the fourth diode and the output voltage stabilizing unit; a negative electrode of the fourth diode is connected with a positive electrode of the third diode and the driving power output unit; and a negative electrode of the third diode is connected with the output voltage stabilizing unit.

6. The IGBT driver power supply circuit according to claim 5, characterized by, The rectifier unit further comprises a third capacitor; the third capacitor is connected with the negative electrode of the third diode and the positive electrode of the fourth diode respectively.

7. The IGBT driver power supply circuit according to claim 2, characterized by, The square wave generating unit comprises a timer chip, a second resistor, a third resistor and a fourth capacitor; the timer chip comprises a threshold pin, a discharge pin, a trigger pin, a power pin and an output pin; the second resistor is connected with the power pin and the discharge pin; the third resistor is connected with the threshold pin and the second resistor; one end of the fourth capacitor is connected with the trigger pin and the threshold pin; the other end of the fourth capacitor is grounded; and the output pin is connected with the signal amplifying unit.

8. The IGBT driver power supply circuit according to claim 2, characterized by, The signal amplifying unit comprises a half-bridge chip; an input end of the half-bridge chip is connected with the square wave generating unit; and an input end of the half-bridge chip is connected with the isolation unit.

9. The IGBT driver power supply circuit according to claim 2, characterized by, The isolation unit comprises a transformer and a fifth capacitor; the fifth capacitor is connected with the signal amplifying unit and a primary side of the transformer; and a secondary side of the transformer is connected with the rectifier unit.

10. A frequency converter, characterized in that The IGBT driving power supply circuit comprises the IGBT driving power supply circuit according to any one of claims 1-9.

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