CN219181402U - Transformer drive circuit for quickly establishing negative voltage - Google Patents
Transformer drive circuit for quickly establishing negative voltage Download PDFInfo
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- CN219181402U CN219181402U CN202320061706.3U CN202320061706U CN219181402U CN 219181402 U CN219181402 U CN 219181402U CN 202320061706 U CN202320061706 U CN 202320061706U CN 219181402 U CN219181402 U CN 219181402U
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- 239000003990 capacitor Substances 0.000 claims abstract description 43
- 238000004804 winding Methods 0.000 claims abstract description 20
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 8
- 239000004065 semiconductor Substances 0.000 abstract description 2
- 229910044991 metal oxide Inorganic materials 0.000 abstract 1
- 150000004706 metal oxides Chemical class 0.000 abstract 1
- 238000000034 method Methods 0.000 description 12
- 229910010271 silicon carbide Inorganic materials 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The utility model discloses a transformer driving circuit for quickly establishing negative voltage, which is connected with an MOS (metal oxide semiconductor) tube and comprises a transformer, a diode D1, a triode, a capacitor C1, a voltage stabilizing diode ZD1, a resistor R6, a diode D2, a capacitor C3 and a resistor R5; one end of a secondary winding of the transformer is respectively connected with an anode of a diode D1 and a base electrode of a triode, a cathode of the diode D1 is respectively connected with an emitter of the triode and a cathode of a voltage stabilizing diode ZD1, a capacitor C1 is connected with the voltage stabilizing diode ZD1 in parallel, the anode of the voltage stabilizing diode ZD1 is respectively connected with an anode of a diode D2, one end of a resistor R6 and a gate electrode of a MOS tube, the other end of the secondary winding of the transformer is respectively connected with a collector of the triode, the other end of the capacitor C3, the other end of the resistor R6 and a source electrode of the MOS tube, the cathode of the diode D2 is connected with one end of the capacitor C3, and the resistor R5 is connected with the capacitor C3 in parallel; the diode D2, the capacitor C3 and the resistor R5 form a negative-pressure quick charging circuit, so that the negative pressure required to be turned off by the MOS tube can be quickly established, and the bridge arm straight-through risk is reduced.
Description
Technical Field
The utility model relates to the technical field of power electronic conversion, in particular to a transformer driving circuit for quickly establishing negative voltage.
Background
With the widespread application of wide bandgap semiconductor devices in the power electronics industry, the power density is higher and higher, and the driving threshold voltage of the wide bandgap devices, such as silicon carbide MOS transistors, is low, so that negative pressure needs to be introduced to ensure the speed and reliability of the turn-off process.
There are two general schemes for introducing negative pressure: one is to use an integrated driver, but requires external supply of positive and negative power; the other is to use a transformer to drive and cooperate with a voltage stabilizing diode to obtain a negative bias, the cost is low, the reliability is relatively high, but the problem is that the negative voltage cannot be built immediately, and the turn-off negative voltage is built slowly after a plurality of switch periods, so that the turn-off reliability is greatly influenced.
Therefore, how to provide a transformer driving circuit for rapidly establishing a negative voltage is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the utility model provides a transformer driving circuit for quickly establishing negative voltage, which can quickly establish the needed turn-off negative voltage of an MOS tube by adding a negative voltage quick charging circuit, reduce the bridge arm through risk and increase the reliability.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
a transformer drive circuit for rapidly establishing negative voltage, connected with a MOS transistor, comprising: the transformer T1, the diode D1, the triode Q1, the capacitor C1, the zener diode ZD1, the resistor R6 and the negative-voltage rapid charging circuit;
one end of a secondary winding of the transformer T1 is respectively connected with an anode of the diode D1 and a base electrode of the triode Q1, a cathode of the diode D1 is respectively connected with an emitter of the triode Q1 and a cathode of the zener diode ZD1, the capacitor C1 is connected with the zener diode ZD1 in parallel, an anode of the zener diode ZD1 is respectively connected with one end of the negative-pressure quick charging circuit, one end of the resistor R6 and a gate electrode of the MOS tube, and the other end of the secondary winding of the transformer T1 is respectively connected with a collector electrode of the triode Q1, the other end of the negative-pressure quick charging circuit, the other end of the resistor R6 and a source electrode of the MOS tube;
the negative-voltage quick charging resistor comprises a diode D2, a capacitor C3 and a resistor R5, wherein the anode of the diode D2 is connected with the anode of the voltage stabilizing diode ZD1, the cathode of the diode D2 is connected with one end of the capacitor C3, the other end of the capacitor C3 is connected with the other end of the secondary winding of the transformer T1, and the resistor R5 is connected with the capacitor C3 in parallel.
Preferably, the transformer driving circuit for rapidly establishing the negative voltage further comprises an acceleration desaturation circuit, wherein the acceleration desaturation circuit comprises a resistor R2, a resistor R4 and a capacitor C2;
one end of the resistor R2 is connected with one end of the secondary winding of the transformer T1, the other end of the resistor R2 is connected with one end of the resistor R4, the other end of the resistor R4 is connected with the base electrode of the triode Q1, and the capacitor C2 is connected with the resistor R4 in parallel.
Preferably, the transformer driving circuit for rapidly establishing the negative voltage further comprises a resistor R1, wherein one end of the resistor R1 is connected with one end of the transformer T1 and one end of the resistor R2 respectively, and the other end of the resistor R1 is connected with the anode of the diode D1.
Preferably, the transformer driving circuit for rapidly establishing the negative voltage further comprises a resistor R3, wherein one end of the resistor R3 is connected with the anode of the diode D2 and the anode of the zener diode, and the other end of the resistor R3 is connected with one end of the resistor R6 and the gate of the MOS transistor.
Preferably, the transformer driving circuit for rapidly establishing the negative voltage further comprises a push-pull circuit, and the output end of the push-pull circuit is connected with the primary winding of the transformer T1.
Compared with the prior art, the utility model discloses a transformer driving circuit for establishing negative voltage, wherein a diode D2, a capacitor C3 and a resistor R5 form a negative voltage quick charging circuit, so that the negative voltage required to be turned off for an MOS tube can be quickly established, and the risk of bridge arm direct connection is reduced; the triode Q1 is provided with a desaturation circuit, so that the turn-on delay of the MOS tube can be improved, and meanwhile, the driving loss is reduced; the drive voltage waveform is free of overshoot.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a transformer driving circuit for rapidly establishing negative voltage according to the present utility model;
FIG. 2 is a schematic diagram of a conventional transformer driving circuit with negative voltage according to the present utility model;
FIG. 3 is a schematic diagram of a driving waveform establishment process of a conventional transformer driving circuit according to the present utility model;
fig. 4 is a schematic diagram of a driving waveform establishment process of the transformer driving circuit for rapidly establishing negative voltage according to the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but 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 embodiment of the utility model discloses a transformer driving circuit for quickly establishing negative voltage, which is connected with an MOS tube as shown in figure 1 and comprises the following components: the transformer T1, the diode D1, the triode Q1, the capacitor C1, the zener diode ZD1, the resistor R6 and the negative-voltage rapid charging circuit;
one end of a secondary winding of the transformer T1 is respectively connected with an anode of the diode D1 and a base electrode of the triode Q1, a cathode of the diode D1 is respectively connected with an emitter of the triode Q1 and a cathode of the zener diode ZD1, the capacitor C1 is connected with the zener diode ZD1 in parallel, the anode of the zener diode ZD1 is respectively connected with one end of the negative-pressure quick charging circuit, one end of the resistor R6 and a gate electrode of the MOS tube, and the other end of the secondary winding of the transformer T1 is respectively connected with a collector of the triode Q1, the other end of the negative-pressure quick charging circuit, the other end of the resistor R6 and a source electrode of the MOS tube;
the negative-voltage quick charging resistor comprises a diode D2, a capacitor C3 and a resistor R5, wherein the anode of the diode D2 is connected with the anode of a voltage stabilizing diode ZD1, the cathode of the diode D2 is connected with one end of the capacitor C3, the other end of the capacitor C3 is connected with the other end of a secondary winding of the transformer T1, and the resistor R5 is connected with the capacitor C3 in parallel.
In order to further implement the technical scheme, the transformer driving circuit for quickly establishing negative voltage further comprises an accelerating desaturation circuit, wherein the accelerating desaturation circuit comprises a resistor R2, a resistor R4 and a capacitor C2;
one end of a resistor R2 is connected with one end of a secondary winding of the transformer T1, the other end of the resistor R2 is connected with one end of a resistor R4, the other end of the resistor R4 is connected with a base electrode of the triode Q1, and a capacitor C2 is connected with the resistor R4 in parallel.
In order to further implement the above technical scheme, the transformer driving circuit for rapidly establishing negative voltage further comprises a resistor R1, wherein one end of the resistor R1 is respectively connected with one end of the transformer T1 and one end of the resistor R2, and the other end of the resistor R1 is connected with the anode of the diode D1.
In order to further implement the above technical scheme, the transformer driving circuit for rapidly establishing negative voltage further comprises a resistor R3, wherein one end of the resistor R3 is respectively connected with the anode of the diode D2 and the anode of the zener diode, and the other end of the resistor R3 is respectively connected with one end of the resistor R6 and the gate electrode of the MOS tube.
In order to further implement the above technical scheme, the transformer driving circuit for rapidly establishing negative voltage further comprises a push-pull circuit, and the output end of the push-pull circuit is connected with the primary winding of the transformer T1.
Taking silicon carbide MOS as an example, the implementation illustrates the principle of negative pressure rapid establishment as follows:
as shown in fig. 2, in a conventional transformer driving circuit with negative voltage, when the secondary side of the transformer outputs a high level, the negative voltage generating capacitor C1 is equivalently charged through resistors R1, R3 and R6. The function of the resistor R6 is a pull-down resistor of the MOS transistor, usually in the order of kiloohms, which is far greater than the resistors R1 and R3, and in addition, the capacitor C1 should reach the order of micro-farads to ensure voltage stability, so that the charging time constant formed by the resistor R6 and the capacitor C1 is in the order of milliseconds, which is more than tens of times of switching frequency, that is, at least tens of switching cycles are needed to reach the set MOS turn-off negative pressure, if the resistor R6 is applied to the driving of the silicon carbide MOS, the reliability of turn-off is greatly affected, the waveform of the driving voltage of the conventional transformer driving circuit shown in fig. 3 is set up, the negative pressure charging process can be seen to be very slow, and the driving voltage of the start process is higher, which exceeds the limit 18V working voltage of the current mainstream silicon carbide MOS transistor.
In the present utility model as shown in fig. 1, when the secondary side of the transformer outputs a high level, since the capacitor C1 is connected in series with the capacitor C3, the voltage division ratio of the two capacitors is inversely proportional to the capacitance in the charging process, and the relationship between the voltage and the capacitance is as follows: vc1=vt C3/(c1+c3); the voltage of the capacitor C3 is full after the negative pressure capacitor C1 is charged to the set value in the first turn-on process of the driving waveform, and the capacitor C3 will not affect the driving waveform due to the diode D2, and the driving waveform establishing process of the transformer driving circuit for quickly establishing negative pressure shown in fig. 4 can see that the negative pressure required by driving is completely established after 1-2 switching cycles, and meanwhile, the forward driving voltage is well stabilized within 15V, so as to meet the driving voltage of the fourth generation silicon carbide MOS.
In this embodiment, the working principle of the acceleration desaturation circuit is as follows:
when the voltage Vt of the secondary winding of the transformer is changed from low to high, the triode Q1 is switched from on to off. Because the traditional transformer driving circuit does not have an acceleration desaturation circuit, the switching-off process of the triode is slower, and meanwhile, the voltage between the emitter and the collector of the triode is converted into positive, so that the triode can pass through larger current instantaneously, and larger loss is caused; the utility model adds the accelerating desaturation circuit, when the voltage Vt of the secondary winding of the transformer is negative, a certain voltage is stored on the capacitor C2, and when the voltage Vt of the secondary winding of the transformer is changed from low to high, the voltage stored by the capacitor C2 just applies back pressure to the emitter junction of the triode Q1, thereby accelerating the turn-off process of the triode Q1 and reducing the loss.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. 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 utility model. Thus, the present utility model 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.
Claims (5)
1. A transformer drive circuit for quickly establishing negative voltage is connected with an MOS tube and is characterized by comprising: the transformer T1, the diode D1, the triode Q1, the capacitor C1, the zener diode ZD1, the resistor R6 and the negative-voltage rapid charging circuit;
one end of a secondary winding of the transformer T1 is respectively connected with an anode of the diode D1 and a base electrode of the triode Q1, a cathode of the diode D1 is respectively connected with an emitter of the triode Q1 and a cathode of the zener diode ZD1, the capacitor C1 is connected with the zener diode ZD1 in parallel, an anode of the zener diode ZD1 is respectively connected with one end of the negative-pressure quick charging circuit, one end of the resistor R6 and a gate electrode of the MOS tube, and the other end of the secondary winding of the transformer T1 is respectively connected with a collector electrode of the triode Q1, the other end of the negative-pressure quick charging circuit, the other end of the resistor R6 and a source electrode of the MOS tube;
the negative-voltage quick charging circuit comprises a diode D2, a capacitor C3 and a resistor R5, wherein the anode of the diode D2 is connected with the anode of the voltage stabilizing diode ZD1, the cathode of the diode D2 is connected with one end of the capacitor C3, the other end of the capacitor C3 is connected with the other end of the secondary winding of the transformer T1, and the resistor R5 is connected with the capacitor C3 in parallel.
2. The transformer driving circuit for rapidly establishing a negative voltage according to claim 1, further comprising an accelerated desaturation circuit comprising a resistor R2, a resistor R4 and a capacitor C2;
one end of the resistor R2 is connected with one end of the secondary winding of the transformer T1, the other end of the resistor R2 is connected with one end of the resistor R4, the other end of the resistor R4 is connected with the base electrode of the triode Q1, and the capacitor C2 is connected with the resistor R4 in parallel.
3. The transformer driving circuit for rapidly establishing a negative voltage according to claim 2, further comprising a resistor R1, wherein one end of the resistor R1 is connected to one end of the transformer T1 and one end of the resistor R2, respectively, and the other end of the resistor R1 is connected to the anode of the diode D1.
4. The transformer driving circuit for rapidly establishing a negative voltage according to claim 1, further comprising a resistor R3, wherein one end of the resistor R3 is connected to the anode of the diode D2 and the anode of the zener diode, and the other end of the resistor R3 is connected to one end of the resistor R6 and the gate of the MOS transistor.
5. The transformer driving circuit for rapidly establishing a negative voltage according to claim 1, further comprising a push-pull circuit, wherein an output terminal of the push-pull circuit is connected to a primary winding of the transformer T1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320061706.3U CN219181402U (en) | 2023-01-09 | 2023-01-09 | Transformer drive circuit for quickly establishing negative voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320061706.3U CN219181402U (en) | 2023-01-09 | 2023-01-09 | Transformer drive circuit for quickly establishing negative voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219181402U true CN219181402U (en) | 2023-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320061706.3U Active CN219181402U (en) | 2023-01-09 | 2023-01-09 | Transformer drive circuit for quickly establishing negative voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219181402U (en) |
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2023
- 2023-01-09 CN CN202320061706.3U patent/CN219181402U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 215000, 1st Floor, Building 2, No. 590 Songhuajiang Road, High tech Zone, Suzhou City, Jiangsu Province Patentee after: Lianke Xihe Energy Technology (Suzhou) Co.,Ltd. Address before: Room 288, Floor 12, Building 1, No. 588, Zixing Road, Minhang District, Shanghai, 201100 Patentee before: Shanghai Lianke Xihe Energy Technology Co.,Ltd. |
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| CP03 | Change of name, title or address |