CN220190848U - Switch tube driving circuit - Google Patents
Switch tube driving circuit Download PDFInfo
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- CN220190848U CN220190848U CN202223281739.3U CN202223281739U CN220190848U CN 220190848 U CN220190848 U CN 220190848U CN 202223281739 U CN202223281739 U CN 202223281739U CN 220190848 U CN220190848 U CN 220190848U
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Abstract
The utility model discloses a switching tube driving circuit which comprises a driving control unit, an on-off regulation circuit and a switching tube circuit, wherein the switching tube driving circuit is connected with the switching tube circuit; the drive control unit; the driving control unit is connected with the switching-off regulation circuit, and the switching-off regulation circuit is connected with the switching tube circuit; the on-off regulation circuit can regulate the turn-off speed and the turn-on speed of the switching tube. The switching tube driving circuit can improve the quick switching-on and switching-off capability of the switching tube, reduce circuit loss, improve driving capability and prolong the service life of the switching tube.
Description
Technical Field
The utility model relates to the technical field of power electronics, in particular to a switching tube driving circuit.
Background
The power electronics technology adopts the switching of a switching tube to realize energy conversion. The switch of the switching tube not only affects the heating of the switching tube, but also is the source of electromagnetic radiation, and all of the heating is realized through the driving of the switching tube. Therefore, the driving of the switching tube is not only a difficulty of the power electronics technology, but also an important point.
In the prior art, the push current and the pull current of the switching tube driving circuit are smaller, the switching tube driving circuit cannot be used for driving a high-power switching tube, the voltage cannot be close to the driving power supply voltage during high-level output, and the voltage is close to the ground level during low-level output. And the power consumption of the switching tube driving circuit is larger. And the high-performance device of the high-power switch tube driving circuit has higher selection cost.
In the prior art, a switching tube cannot be turned off rapidly, switching loss is large, enough driving capability cannot be guaranteed, meanwhile, parasitic inductance exists in a circuit, and driving interference peak is overlarge, so that the service life of the switching tube is influenced.
Disclosure of Invention
The utility model provides a switching tube driving circuit which aims to solve the problems existing in the prior art.
In order to solve the above problems, in an embodiment of the present utility model, there is provided a switching tube driving circuit including: the switching control circuit comprises a driving control unit, an on-off regulation circuit and a switching tube circuit;
the drive control unit; the driving control unit is connected with the switching-off regulation circuit, and the switching-off regulation circuit is connected with the switching tube circuit; the on-off regulation circuit can regulate the turn-off speed and the turn-on speed of the switching tube.
In an embodiment of the present utility model, the on-off regulation circuit includes: the first resistor R1, the diode D1, the transistor Q2 and the second resistor R2; one end of the first resistor is connected with the drive control unit, and the other end of the first resistor is respectively connected with one end of the diode D1 and the base electrode of the transistor Q2; the collector electrode of the transistor Q2 is grounded, and the emitter electrode of the transistor Q2 is connected with one end of the second resistor R2; the other end of the second resistor R2 is connected to the other end of the diode D1 and to the connection.
In the embodiment of the present utility model, the transistor Q2 is a PNP transistor.
In the embodiment of the present utility model, the first resistor R1 and the second resistor R2 are current limiting resistors.
In an embodiment of the present utility model, the switching tube circuit includes: the MOS tube Q1, the third resistor R3 and the fourth resistor RS; the grid electrode of the MOS tube Q1 is connected with the switch regulating circuit; the grid of the MOS tube Q1 is connected with one end of the third resistor R3, the other end of the third resistor R3 is respectively connected with the source electrode of the MOS tube Q1 and one end of the fourth resistor RS, one end of the fourth resistor RS is connected with the source electrode of the MOS tube Q1, and the other end of the fourth resistor RS is grounded.
In the embodiment of the utility model, the MOS transistor Q1 is an N-channel enhanced MOS transistor.
In the embodiment of the utility model, the driving control unit is an analog controller or a digital controller.
The utility model has the advantages that: by using the driving circuit, the switching tube can be rapidly turned off, the switching loss is reduced, and the driving capability is ensured to be enough in principle, and meanwhile, the application requirement of a system is met.
By using the driving circuit, the switching-off speed is high, the driving interference peak is reduced, and the service life of the switching tube is prolonged.
A transistor Q2 is connected in series in the circuit, so that the turn-off speed of the switching tube is increased; the transistor Q2 is connected in series with the second resistor R2 to control the turn-off speed.
Drawings
The foregoing and/or additional aspects and advantages of the present utility model will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic diagram of a driving circuit of a switching tube according to an embodiment of the present utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The technical scheme of the utility model is further described in detail through the drawings and the embodiments.
As shown in fig. 1, in an embodiment of the present utility model, there is provided a switching tube driving circuit, including: the switching control circuit comprises a driving control unit, an on-off regulation circuit and a switching tube circuit;
the drive control unit; the driving control unit is connected with the switching-off regulation circuit, and the switching-off regulation circuit is connected with the switching tube circuit; the on-off regulation circuit can regulate the turn-off speed and the turn-on speed of the switching tube.
In an embodiment of the present utility model, the on-off regulation circuit includes: the first resistor R1, the diode D1, the transistor Q2 and the second resistor R2; one end of the first resistor is connected with the drive control unit, and the other end of the first resistor is respectively connected with one end of the diode D1 and the base electrode of the transistor Q2; the collector electrode of the transistor Q2 is grounded, and the emitter electrode of the transistor Q2 is connected with one end of the second resistor R2; the other end of the second resistor R2 is connected with the other end of the diode D1 and is connected with the switching tube circuit.
In the embodiment of the present utility model, the transistor Q2 is a PNP transistor.
In the embodiment of the present utility model, the first resistor R1 and the second resistor R2 are current limiting resistors.
In an embodiment of the present utility model, the switching tube circuit includes: the MOS tube Q1, the third resistor R3 and the fourth resistor RS; the grid electrode of the MOS tube Q1 is connected with the switch regulating circuit; the grid of the MOS tube Q1 is connected with one end of the third resistor R3, the other end of the third resistor R3 is respectively connected with the source electrode of the MOS tube Q1 and one end of the fourth resistor RS, one end of the fourth resistor RS is connected with the source electrode of the MOS tube Q1, and the other end of the fourth resistor RS is grounded.
In the embodiment of the utility model, the MOS transistor Q1 is an N-channel enhanced MOS transistor.
In the embodiment of the utility model, the driving control unit is an analog controller or a digital controller.
The specific driving control process comprises the following steps:
first, a driving control unit is selected according to the size of a switching tube, and the first resistor R1 adjusts the opening speed. The second resistor R2 regulates the turn-off speed.
When the drive control unit supplies current to the drive switch tube, the diode D1 is used for conducting the Q1 of the switch tube through the first resistor R1, and when the Q1 of the switch tube is turned off, the PNP triode Q2 is accelerated to be turned off through the second resistor R2.
The switching-off instant driving circuit can provide a path with the lowest impedance as possible for the rapid discharge of the capacitor voltage between the grid and the source of the MOSFET, so that the switching tube can be switched off rapidly. The driving circuit accelerates the switching-off time of the switching tube. It is common for a transistor to bleed off the gate-source capacitance voltage. If the emitter of the transistor Q2 has no resistor, when the transistor Q2 is conducted, the capacitance between the gate and the source is short-circuited, so that the charge is discharged in the shortest time, and the cross loss during the turn-off is reduced to the greatest extent. There is also an advantage in that the current does not pass through the drive control unit when the charge on the gate-source capacitance is discharged, improving reliability and reducing loops.
By using the driving circuit, the switching tube can be rapidly turned off, the switching loss is reduced, and the driving capability is ensured to be enough in principle, and meanwhile, the application requirement of a system is met.
With this drive circuit, the turn-off speed is high, which can cause drive disturbance spikes if parasitic inductance is present in the line.
A transistor Q2 is connected in series in the circuit, so that the turn-off speed of the switching tube is increased; transistor Q2 is connected in series with R2 to control its turn-off speed.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the utility model and that various changes in form and details may be made therein without departing from the spirit and scope of the utility model.
In the description of the present specification, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "an exemplary embodiment," "an example," "a particular example," or "some examples" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, unless specifically defined otherwise.
Although embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by those skilled in the art within the scope of the utility model, which is defined by the claims and their equivalents.
Claims (7)
1. The switching tube driving circuit is characterized by comprising a driving control unit, an on-off regulation circuit and a switching tube circuit; the drive control unit; the driving control unit is connected with the switching-off regulation circuit, and the switching-off regulation circuit is connected with the switching tube circuit; the switching-on and switching-off regulating circuit can regulate the switching-off speed and the switching-on speed of the switching tube circuit.
2. The switching tube driving circuit according to claim 1, wherein the turn-off regulation circuit comprises: the first resistor R1, the diode D1, the transistor Q2 and the second resistor R2; one end of the first resistor is connected with the drive control unit, and the other end of the first resistor is respectively connected with one end of the diode D1 and the base electrode of the transistor Q2; the collector electrode of the transistor Q2 is grounded, and the emitter electrode of the transistor Q2 is connected with one end of the second resistor R2; the other end of the second resistor R2 is connected with the other end of the diode D1 and is connected with the switching tube circuit.
3. The switching transistor driving circuit according to claim 2, wherein the transistor Q2 is a PNP transistor.
4. The switching tube driving circuit according to claim 2, wherein the first resistor R1 and the second resistor R2 are both current limiting resistors.
5. The switching tube driving circuit according to claim 2, wherein the switching tube circuit comprises: the MOS tube Q1, the third resistor R3 and the fourth resistor RS; the grid electrode of the MOS tube Q1 is connected with the on-off regulation circuit; the grid of the MOS tube Q1 is connected with one end of the third resistor R3, the other end of the third resistor R3 is respectively connected with the source electrode of the MOS tube Q1 and one end of the fourth resistor RS, one end of the fourth resistor RS is connected with the source electrode of the MOS tube Q1, and the other end of the fourth resistor RS is grounded.
6. The switching tube driving circuit according to claim 5, wherein the MOS transistor Q1 is an N-channel enhancement type MOS transistor.
7. The switching tube driving circuit according to claim 1, wherein the driving control unit is an analog controller or a digital controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223281739.3U CN220190848U (en) | 2022-12-07 | 2022-12-07 | Switch tube driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223281739.3U CN220190848U (en) | 2022-12-07 | 2022-12-07 | Switch tube driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220190848U true CN220190848U (en) | 2023-12-15 |
Family
ID=89100627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223281739.3U Active CN220190848U (en) | 2022-12-07 | 2022-12-07 | Switch tube driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220190848U (en) |
-
2022
- 2022-12-07 CN CN202223281739.3U patent/CN220190848U/en active Active
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