CN112953168A - Switching tube circuit structure and circuit system - Google Patents
Switching tube circuit structure and circuit system Download PDFInfo
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- CN112953168A CN112953168A CN202110233425.7A CN202110233425A CN112953168A CN 112953168 A CN112953168 A CN 112953168A CN 202110233425 A CN202110233425 A CN 202110233425A CN 112953168 A CN112953168 A CN 112953168A
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- 238000010521 absorption reaction Methods 0.000 claims description 78
- 239000003990 capacitor Substances 0.000 claims description 10
- 230000000694 effects Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000001939 inductive effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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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
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electronic Switches (AREA)
Abstract
本发明公开了一种开关管电路结构及电路系统，包括：第一开关管以及第二开关管，第一开关管的输入端能够与外部正电源连接，第二开关管的输出端能够与外部负电源连接，第一开关管的输出端以及第二开关管的输入端均接地；驱动单元，驱动单元分别与第一开关管的控制端以及第二开关管的控制端连接。在第一开关管导通并且第二开关管截止的情况下，正电源通过第一开关管与地构成回路进行泄放，使得第二开关管不会承受正电源与负电源之间的全部电压差，实现减少施加在第二开关管上电压大小的效果，同理，在第一开关管截止并且第二开关管导通的情况下，亦能够减少施加在第一开关管上电压大小的效果，有利于降低第一开关管与第二开关管被损坏的几率。
The invention discloses a circuit structure and a circuit system of a switch tube, comprising: a first switch tube and a second switch tube, the input end of the first switch tube can be connected to an external positive power supply, and the output end of the second switch tube can be connected to an external The negative power supply is connected, and the output end of the first switch tube and the input end of the second switch tube are grounded; the driving unit is connected to the control end of the first switch tube and the control end of the second switch tube respectively. When the first switch tube is turned on and the second switch tube is off, the positive power supply is discharged through a loop formed by the first switch tube and the ground, so that the second switch tube will not withstand the full voltage between the positive power supply and the negative power supply Poor, to achieve the effect of reducing the magnitude of the voltage applied to the second switch. Similarly, when the first switch is turned off and the second switch is turned on, the effect of the voltage applied to the first switch can also be reduced. , which is beneficial to reduce the probability that the first switch tube and the second switch tube are damaged.
Description
Technical Field
The invention relates to the field of switching tubes, in particular to a switching tube circuit structure and a switching tube circuit system.
Background
The switching tube is used as a common electronic element and widely applied to different product devices, wherein an IGBT (insulated gate bipolar transistor) is a composite fully-controlled voltage-driven power semiconductor device composed of a BJT (bipolar junction transistor) and an MOS (insulated gate field effect transistor), has the advantages of both high input impedance of the MOSFET and low conduction voltage drop of the GTR, and is therefore commonly used in high-current and high-power circuits such as power circuits and test circuits.
The connection of two switching tubes to form a half-bridge is a common circuit structure. In the prior art, in order to realize certain functions, sometimes a positive voltage is connected to one end of a half bridge, and a negative voltage is connected to the other end of the half bridge, at this time, when one switch tube in the half bridge is conducted and the other switch tube is cut off, the voltage difference between the positive voltage and the negative voltage is almost completely applied to the cut-off switch tube, so that the voltage of the switch tube is higher. In addition, by combining with factors such as stray inductance in the circuit, a spike voltage is generated when the switching tube is turned off or turned on, so that the switching tube is easily broken down and damaged due to overhigh voltage under the condition that a positive voltage is used in cooperation with a negative voltage.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a switching tube circuit structure which can reduce the probability of damaging a first switching tube and a second switching tube under the condition that a positive power supply is matched with a negative power supply.
The invention also provides a circuit system which can reduce the probability of damaging the first switch tube and the second switch tube under the condition that the positive power supply is matched with the negative power supply for use.
According to a first aspect embodiment of the invention, a switching tube circuit structure comprises: the input end of the first switching tube can be connected with an external positive power supply, the output end of the second switching tube can be connected with an external negative power supply, and the output end of the first switching tube is connected with the input end of the second switching tube and grounded; and the driving unit is respectively connected with the control end of the first switch tube and the control end of the second switch tube.
The switching tube circuit structure provided by the embodiment of the invention at least has the following beneficial effects: the driving unit controls the first switch tube and the second switch tube to work, the output end of the first switch tube is connected with the input end of the second switch tube and then grounded, so that under the condition that the first switch tube is switched on and the second switch tube is switched off, the positive power supply forms a loop with the ground through the first switch tube to be discharged, the second switch tube cannot bear all voltage differences between the positive power supply and the negative power supply, and the effect of reducing the voltage applied to the second switch tube is achieved. With the structure, when the first switch tube and the second switch tube are both switched on or switched off, the current flowing through the structure is the same as that of the traditional structure, when one of the first switch tube and the second switch tube is switched off and the other switch tube is switched on, the probability that the first switch tube and the second switch tube are damaged is favorably reduced, and the reliability is improved.
According to some embodiments of the invention, the first switching tube and the second switching tube are both IGBTs.
According to some embodiments of the present invention, the dc-dc converter further comprises a first freewheeling diode and a second freewheeling diode, wherein a cathode of the first freewheeling diode is connected to the input terminal of the first switching tube, an anode of the first freewheeling diode is connected to the output terminal of the first switching tube, a cathode of the second freewheeling diode is connected to the input terminal of the second switching tube, and an anode of the second freewheeling diode is connected to the output terminal of the second switching tube.
According to some embodiments of the invention, the switch further comprises a spike absorption module, wherein the spike absorption module is connected with the first switch tube and/or the second switch tube.
According to some embodiments of the invention, the spike absorption module comprises at least one absorption cell;
the input end of the absorption unit is connected with the input end of the first switch tube, and the output end of the absorption unit is grounded;
or the input end of the absorption unit is connected with the input end of the first switch tube, and the output end of the absorption unit is connected with the output end of the second switch tube;
or the input end of the absorption unit is grounded, and the output end of the absorption unit is connected with the output end of the second switch tube.
According to some embodiments of the present invention, the absorption unit includes a diode, a resistor, and a capacitor, an anode of the diode is connected to one end of the resistor as an input terminal of the absorption unit, a cathode of the diode is connected to the other end of the resistor and one end of the capacitor, respectively, and the other end of the capacitor is used as an output terminal of the absorption unit.
According to some embodiments of the present invention, the absorption units include three first absorption units, a second absorption unit and a third absorption unit, an input end of the first absorption unit is connected to an input end of the first switch tube, and an output end of the first absorption unit is grounded; the input end of the second absorption unit is connected with the input end of the first switch tube, and the output end of the second absorption unit is connected with the output end of the second switch tube; the input end of the third absorption unit is grounded, and the output end of the third absorption unit is connected with the output end of the second switch tube.
According to a second aspect of the present invention, a circuit system includes the above-mentioned switch tube circuit structure, and further includes a positive power supply, a negative power supply, a first load, and a second load, where the positive power supply is connected to an input terminal of the first switch tube through the first load, and the negative power supply is connected to an output tube of the second switch tube through the second load.
The circuit system according to the embodiment of the invention has at least the following advantages: the driving unit controls the first switch tube and the second switch tube to be switched on or switched off according to the requirement so as to control the current flowing through the first load and the second load and meet the use requirement. The output end of the first switch tube is connected with the input end of the second switch tube and grounded, so that when the first switch tube and the second switch tube are both cut off, the current flowing through the first switch tube and the second switch tube is the same as that of the traditional structure, the voltage difference between the positive power supply and the negative power supply is borne by the divided voltage of the first switch tube and the second switch tube, and when the first switch tube and the second switch tube are both switched on, the current flowing through the first switch tube and the second switch tube is the same as that of the traditional structure. When one of the first switch tube and the second switch tube is switched on and the other is switched off, compared with the traditional structure, the voltage born by the first switch tube or the second switch tube can be reduced, the probability of damaging the first switch tube and the second switch tube is favorably reduced, and the reliability is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a circuit diagram of one embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, if there are first and second described only for the purpose of distinguishing technical features, it is not understood that relative importance is indicated or implied or that the number of indicated technical features or the precedence of the indicated technical features is implicitly indicated or implied.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
As shown in fig. 1, a switching tube circuit structure according to an embodiment of the present invention includes: the power supply circuit comprises a first switching tube 100 and a second switching tube 200, wherein the input end of the first switching tube 100 can be connected with an external positive power supply, the output end of the second switching tube 200 can be connected with an external negative power supply, and the output end of the first switching tube 100 is connected with the input end of the second switching tube 200 and is grounded; and a driving unit 300, wherein the driving unit 300 is respectively connected to the control end of the first switch tube 100 and the control end of the second switch tube 200.
The driving unit 300 controls the first switch tube 100 and the second switch tube 200 to operate, and the output end of the first switch tube 100 is connected to the input end of the second switch tube 200 and grounded, so that when the first switch tube 100 is turned on and the second switch tube 200 is turned off, the positive power source forms a loop with the ground through the first switch tube 100 to be discharged, and the second switch tube 200 does not bear all voltage differences between the positive power source and the negative power source, thereby achieving the effect of reducing the magnitude of the voltage applied to the second switch tube 200, and similarly, when the first switch tube 100 is turned off and the second switch tube 200 is turned on, the effect of reducing the magnitude of the voltage applied to the first switch tube 100 can also be reduced. With this structure, when the first switch tube 100 and the second switch tube 200 are both turned on or off, the current is the same as that of the existing structure, and when one of them is turned off and the other is turned on, the probability of damage to the first switch tube 100 and the second switch tube 200 is reduced, and the reliability is improved.
The driving unit 300 may be an embodiment including a common switching tube driving circuit, such as an IGBT driving circuit, a MOS tube driving circuit, and the like.
Referring to fig. 1, in some embodiments of the present invention, the first switching tube 100 and the second switching tube 200 are both IGBTs.
The IGBT has the advantages of low on-resistance, high withstand voltage, high switching speed and the like, has excellent performance, and is suitable for different occasions such as a power circuit, a test circuit and the like with large current. When the first switch tube 100 and the second switch tube are both IGBTs, the collector of the IGBT is the input terminal, the emitter of the IGBT is the output terminal, and the gate of the IGBT is the control terminal.
The switch tube can also be a MOS tube or the like.
Referring to fig. 1, in some embodiments of the present invention, a first freewheeling diode 400 and a second freewheeling diode 500 are further included, a cathode of the first freewheeling diode 400 is connected to an input terminal of the first switching tube 100, an anode of the first freewheeling diode 400 is connected to an output terminal of the first switching tube 100, a cathode of the second freewheeling diode 500 is connected to an input terminal of the second switching tube 200, and an anode of the second freewheeling diode 500 is connected to an output terminal of the second switching tube 200.
The first freewheeling diode 400 is connected in parallel with the first switch tube 100, and the second freewheeling diode 500 is connected in parallel with the second switch tube 200, so that the switch tube and other elements can be protected when voltage or current in the circuit suddenly changes, a continuous circulation path is provided when the load is an inductive load or an inductive component in the circuit, the switch tube is prevented from being damaged by high voltage, and the reliability is improved.
Referring to fig. 1, in some embodiments of the present invention, a spike absorbing module 600 is further included, and the spike absorbing module 600 is connected to the first switching tube 100 and/or the second switching tube 200.
Because of factors such as stray inductance in the circuit, the first switch tube 100 and the second switch tube 200 can generate peak voltage when being cut off or switched on, and the peak absorption module 600 is connected with the first switch tube 100 and/or the second switch tube 200 and can absorb the peak voltage, so that the voltage change of the first switch tube 100 and the second switch tube 200 when being cut off or switched on is more stable, the peak voltage is favorably reduced, the first switch tube 100 and the second switch tube 200 are protected, the probability of breakdown damage is reduced, and the peak voltage can be absorbed by the peak absorption module 600,
Referring to fig. 1, in some embodiments of the invention, the spike absorption module 600 includes at least one absorption cell;
the input end of the absorption unit is connected with the input end of the first switch tube 100, and the output end of the absorption unit is grounded;
or, the input end of the absorption unit is connected with the input end of the first switch tube 100, and the output end of the absorption unit is connected with the output end of the second switch tube 200;
or, the input end of the absorption unit is grounded, and the output end of the absorption unit is connected with the output end of the second switch tube 200.
The absorption units are respectively connected with the input end of the first switch tube 100 and the ground, so that the spike voltage generated when the first switch tube 100 is cut off or turned on can be reduced; the absorption units are respectively connected with the ground and the output end of the second switch tube 200, so that the spike voltage generated when the second switch tube 200 is cut off or switched on can be reduced; the absorption unit is respectively connected to the input terminal of the first switch tube 100 and the output terminal of the second switch tube 200, so that the peak voltage generated when the first switch unit and the second switch unit are turned off or turned on can be reduced. Therefore, the probability of damage to the first switch tube 100 or the second switch tube 200 due to spike voltage is further reduced.
Referring to fig. 1, in some embodiments of the present invention, the absorption unit includes a diode, a resistor, and a capacitor, an anode of the diode is connected to one end of the resistor as an input terminal of the absorption unit, a cathode of the diode is connected to the other end of the resistor and one end of the capacitor, respectively, and the other end of the capacitor is used as an output terminal of the absorption unit.
The absorption unit is formed by the diode, the resistor and the capacitor, so that the structure is simple and the implementation is convenient.
Referring to fig. 1, in some embodiments of the present invention, there are three absorption units, namely a first absorption unit 610, a second absorption unit 620 and a third absorption unit 630, wherein an input terminal of the first absorption unit 610 is connected to an input terminal of the first switch tube 100, and an output terminal of the first absorption unit 610 is grounded; the input end of the second absorption unit 620 is connected with the input end of the first switch tube 100, and the output end of the second absorption unit 620 is connected with the output end of the second switch tube 200; the input terminal of the third absorption unit 630 is grounded, and the output terminal of the third absorption unit 630 is connected to the output terminal of the second switch tube 200.
By providing three absorption units, the first absorption unit 610 is connected to the input terminal of the first switch tube 100 and the ground, the second absorption unit 620 is connected to the ground and the output terminal of the second switch tube 200, and the third absorption unit 630 is connected to the input terminal of the first switch tube 100 and the output terminal of the second switch tube 200. With this structure, the peak voltage can be further reduced, the probability of damage to the first switching tube 100 and the second switching tube 200 due to the peak voltage can be further reduced, and the reliability can be improved.
Referring to the drawings, the circuit system according to the second embodiment of the present invention includes the above-mentioned switching tube circuit structure, and further includes a positive power supply, a negative power supply, a first load 700, and a second load 800, wherein the positive power supply is connected to the input terminal of the first switching tube 100 through the first load 700, and the negative power supply is connected to the output tube of the second switching tube 200 through the second load 800.
The driving unit 300 controls the first switch tube 100 and the second switch tube 200 to be turned on or off according to the requirement, so as to control the current flowing through the first load 700 and the second load 800, thereby meeting the requirement of use. The output terminal of the first switch tube 100 is connected to the input terminal of the second switch tube 200 and grounded, so that when the first switch tube 100 and the second switch tube 200 are both turned off, the current flowing through the first switch tube 100 is the same as that flowing through the second switch tube 200, the voltage difference between the positive power supply and the negative power supply is divided by the first switch tube 100 and the second switch tube 200, and when the first switch tube 100 and the second switch tube 200 are both turned on, the current flowing through the second switch tube 100 is the same as that flowing through the second switch tube 200. When one of the first switch tube 100 and the second switch tube 200 is turned on and the other is turned off, compared with the conventional structure, the voltage borne by the first switch tube 100 or the second switch tube 200 can be reduced, which is beneficial to reducing the probability of the first switch tube 100 and the second switch tube 200 being damaged and improving the reliability.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110233425.7A CN112953168A (en) | 2021-03-03 | 2021-03-03 | Switching tube circuit structure and circuit system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110233425.7A CN112953168A (en) | 2021-03-03 | 2021-03-03 | Switching tube circuit structure and circuit system |
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| CN112953168A true CN112953168A (en) | 2021-06-11 |
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| CN202110233425.7A Pending CN112953168A (en) | 2021-03-03 | 2021-03-03 | Switching tube circuit structure and circuit system |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020141213A1 (en) * | 2001-01-09 | 2002-10-03 | Cv Squared Limited | Low-loss capacitance driver circuit |
| JP2004274974A (en) * | 2003-03-12 | 2004-09-30 | Calsonic Kansei Corp | Pwm driving device |
| CN202957746U (en) * | 2012-11-21 | 2013-05-29 | 北京曙光航空电气有限责任公司 | Peak voltage absorption circuit of direct current/alternating current (DC/AC) transducer switch tube of airplane starting system |
| WO2015175820A1 (en) * | 2014-05-15 | 2015-11-19 | Cree, Inc. | HIGH CURRENT, LOW SWITCHING LOSS SiC POWER MODULE |
| US20190288683A1 (en) * | 2016-11-17 | 2019-09-19 | Daihen Corporation | Drive Circuit and Impedance Matching Device |
| CN214674848U (en) * | 2021-03-03 | 2021-11-09 | 中山市科力高氢能设备有限公司 | A switch tube circuit structure and circuit system |
-
2021
- 2021-03-03 CN CN202110233425.7A patent/CN112953168A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020141213A1 (en) * | 2001-01-09 | 2002-10-03 | Cv Squared Limited | Low-loss capacitance driver circuit |
| JP2004274974A (en) * | 2003-03-12 | 2004-09-30 | Calsonic Kansei Corp | Pwm driving device |
| CN202957746U (en) * | 2012-11-21 | 2013-05-29 | 北京曙光航空电气有限责任公司 | Peak voltage absorption circuit of direct current/alternating current (DC/AC) transducer switch tube of airplane starting system |
| WO2015175820A1 (en) * | 2014-05-15 | 2015-11-19 | Cree, Inc. | HIGH CURRENT, LOW SWITCHING LOSS SiC POWER MODULE |
| US20190288683A1 (en) * | 2016-11-17 | 2019-09-19 | Daihen Corporation | Drive Circuit and Impedance Matching Device |
| CN214674848U (en) * | 2021-03-03 | 2021-11-09 | 中山市科力高氢能设备有限公司 | A switch tube circuit structure and circuit system |
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