CN212278111U - LLC drive circuit - Google Patents
LLC drive circuit Download PDFInfo
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- CN212278111U CN212278111U CN202021226328.2U CN202021226328U CN212278111U CN 212278111 U CN212278111 U CN 212278111U CN 202021226328 U CN202021226328 U CN 202021226328U CN 212278111 U CN212278111 U CN 212278111U
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- 239000003990 capacitor Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
The utility model provides a LLC drive circuit, is including two power NMOS pipes of establishing ties between high voltage power supply and ground, and the common port of two power NMOS pipes connects the output stage as the output, and the drive level power of the power NMOS pipe of being connected with high voltage power supply passes through bootstrap diode and connects low voltage power supply, low voltage power supply and drive level power are connected respectively to bootstrap diode's positive pole and negative pole, the drive level power still is connected through first electric capacity the output. Adopt LLC drive circuit makes the trombone slide drive level voltage rise and makes the grid voltage lifting when opening through setting up bootstrap diode, improves grid driving voltage, makes the trombone slide open more fully, has effectively reduced switching loss.
Description
Technical Field
The utility model belongs to the electronic circuit field relates to the drive technique in the power, concretely relates to LLC drive circuit.
Background
Unlike a conventional PWM (pulse width modulation) converter, the LLC is a resonant circuit that achieves output voltage constancy by controlling the switching frequency (frequency modulation). It has the advantages that: zero voltage switching-on (ZVS) of two primary side main MOS switches and zero current switching-off (ZCS) of a secondary side rectifier diode are realized, and through a soft switching technology, the switching loss of a power supply can be reduced, and the efficiency and the power density of the power converter are improved. In the LLC circuit, the not enough grid voltage of trombone slide can lead to the trombone slide to open inadequately, and high limit driving capability is not enough to cause the increase of upper tube consumption, and calorific capacity sharply increases, leads to exploding the machine even.
SUMMERY OF THE UTILITY MODEL
For the technical defect who overcomes prior art existence, the utility model discloses a LLC drive circuit.
LLC drive circuit, including two power NMOS pipes of establishing ties between high voltage power supply and ground, the output level is connected as the output to the common port of two power NMOS pipes, and the drive level power of the drive level of the power NMOS pipe of being connected with high voltage power supply connects low voltage power supply through bootstrapping diode, low voltage power supply and drive level power are connected respectively to bootstrapping diode's positive pole and negative pole, the drive level power still is connected through first electric capacity the output.
Preferably, a grid resistor is connected to the grid of the power tube.
Specifically, the output stage comprises an inductor and a transformer, one end of the inductor is connected with the common end of the two power NMOS tubes, the other end of the inductor is connected with the primary side of the transformer, and the other end of the primary side of the transformer is grounded through a second capacitor.
Adopt LLC drive circuit makes the trombone slide drive level voltage rise and makes the grid voltage lifting when opening through setting up bootstrap diode, improves grid driving voltage, makes the trombone slide open more fully, has effectively reduced switching loss.
Drawings
Fig. 1 is a schematic diagram of an embodiment of an LLC driving circuit according to the present invention; the reference numbers in the figure are VCC-low voltage, R-grid resistance, HV-high voltage power supply, Q1-pull-up tube, Q2-pull-down tube, DR-H-pull-up driving signal, DR-L-pull-down driving signal, C1-first capacitor, C2-second capacitor, D-bootstrap diode, L-inductor, T-transformer, OUT-output end, DH-driving stage power supply and DR-driving stage.
Detailed Description
The following describes the present invention in further detail with reference to the accompanying drawings.
LLC drive circuit, including establishing ties two power NMOS pipes between high voltage power supply and ground, the output level is connected as the output to the common port of two power NMOS pipes, and the drive level power of the drive level DR of the power NMOS pipe of being connected with high voltage power supply connects low voltage power supply through bootstrapping diode, low voltage power supply and drive level power are connected respectively to bootstrapping diode's positive pole and negative pole, drive level power still is connected through first electric capacity the output.
The driving stage is generally formed by cascading a plurality of complementary MOS tube pairs to form an inverter structure, a driving stage power supply is used for providing a high level of a grid electrode of a pull-up NMOS tube, a driving stage power supply DH is connected with a low-voltage power supply through a bootstrap diode, so that a pull-up voltage is raised by the low-voltage power supply HV, the grid voltage is increased, the pull-up tube Q1 is fully opened, an on-resistance is reduced to the minimum, the on-loss of the pull-up tube is reduced, a first capacitor has the function of stabilizing an output voltage, and when an output end OUT is at a high level, the grid voltage can also tend to rise through the first capacitor according to a charge conservation principle; because the output end forms feedback to the driving stage through the pull-up tube, the first capacitor provides a pole at the output end at the same time, and the stability of the circuit can be better.
In the embodiment shown in fig. 1, the output stage is a typical LLC connection, and includes an inductor L and a transformer T, where one end of the inductor L is connected to the common end of the two power NMOS transistors, the other end of the inductor L is connected to the primary side of the transformer, and the other end of the primary side of the transformer is grounded through a second capacitor C2.
The grid electrode of the power tube can be connected with a grid electrode resistor R, and the electrostatic protection capability of the grid electrode is improved.
Adopt LLC drive circuit makes the trombone slide drive level voltage rise and makes the grid voltage lifting when opening through setting up bootstrap diode, improves grid driving voltage, makes the trombone slide open more fully, has effectively reduced switching loss.
In the foregoing, the preferred embodiments of the present invention, if not obviously contradictory or based on a certain preferred embodiment, can be combined and used by any superposition, the specific parameters in the embodiments and examples are only for clearly expressing the utility model verification process of the utility model, and are not used for limiting the patent protection scope of the present invention, the patent protection scope of the present invention is still based on the claims, and all the equivalent structural changes made by the contents of the specification and the drawings of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The LLC drive circuit comprises two power NMOS tubes connected in series between a high-voltage power supply and the ground, wherein the common end of the two power NMOS tubes is used as an output end to be connected with an output stage.
2. The LLC driving circuit of claim 1, wherein a gate resistor is connected to the gate of said power transistor.
3. The LLC driver circuit of claim 1, wherein said output stage includes an inductor and a transformer, said inductor having one end connected to a common terminal of the two power NMOS transistors and another end connected to a primary side of the transformer, said primary side of the transformer having another end connected to ground via a second capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021226328.2U CN212278111U (en) | 2020-06-29 | 2020-06-29 | LLC drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021226328.2U CN212278111U (en) | 2020-06-29 | 2020-06-29 | LLC drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212278111U true CN212278111U (en) | 2021-01-01 |
Family
ID=73881485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021226328.2U Active CN212278111U (en) | 2020-06-29 | 2020-06-29 | LLC drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212278111U (en) |
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2020
- 2020-06-29 CN CN202021226328.2U patent/CN212278111U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A LLC driver circuit Effective date of registration: 20231212 Granted publication date: 20210101 Pledgee: Chenghua sub branch of Bank of Chengdu Co.,Ltd. Pledgor: CHENGDU HUAPU ELECTRIC APPLIANCE CO.,LTD. Registration number: Y2023510000270 |