CN117833677A - Resonant driving circuit and switching power supply - Google Patents
Resonant driving circuit and switching power supply Download PDFInfo
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- CN117833677A CN117833677A CN202311719769.4A CN202311719769A CN117833677A CN 117833677 A CN117833677 A CN 117833677A CN 202311719769 A CN202311719769 A CN 202311719769A CN 117833677 A CN117833677 A CN 117833677A
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Abstract
A resonance drive circuit and a switching power supply, the resonance drive circuit includes: the driving input unit is provided with a driving input end and a driving output end, the driving input end is used for inputting a driving control signal, and the driving input unit is used for outputting a driving excitation signal according to the driving control signal and outputting the driving excitation signal by the driving output end; the transformer isolation unit is provided with a primary winding unit and a plurality of secondary winding units; the switching units are arranged in one-to-one correspondence with the secondary winding units, and each switching unit is provided with a first connecting end, a second connecting end and a first controlled end; the multiple main MOS tubes are arranged in one-to-one correspondence with the multiple switching units of the switching tubes, the grid electrode of each main MOS tube is connected with the first controlled end, the source electrode is connected with the second connecting end, and the drain electrode is used for connecting a load. The resonant driving circuit provided by the invention can realize high-frequency resonant driving and only keep the positive pressure part of the resonant waveform.
Description
Technical Field
The present invention relates to the field of electronic circuits, and in particular, to a resonant driving circuit and a switching power supply.
Background
When the switching frequency of a switching power supply using a silicon MOS tube as a switching device exceeds 500kHz, the square wave driving can bring larger driving loss, so that the square wave driving cannot work at higher switching frequency, when the switching frequency reaches 1MHz or higher, a sine wave is usually required to be generated in an LC resonance mode to drive the MOS tube, and the waveform of resonance driving is generally sine wave, so that the driving waveform has larger negative pressure, but the negative pressure is not allowed to exist at the driving end of the MOS tube in special occasions such as aerospace.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a resonant driving circuit which can realize high-frequency resonant driving and simultaneously only keep the positive pressure part of a resonant waveform.
The invention also provides a switching power supply.
A resonant drive circuit according to an embodiment of the first aspect of the present invention includes:
the driving input unit is provided with a driving input end and a driving output end, wherein the driving input end is used for inputting a driving control signal, and the driving input unit is used for outputting a driving excitation signal according to the driving control signal and outputting the driving excitation signal by the driving output end;
the transformer isolation unit is provided with a primary winding unit and a plurality of secondary winding units, and the primary winding unit is connected with the driving output end;
the switching units are arranged in one-to-one correspondence with the secondary winding units, each switching unit is provided with a first connecting end, a second connecting end and a first controlled end, and the first connecting end and the first controlled end are connected with the corresponding secondary winding unit;
the main MOS tubes are arranged in one-to-one correspondence with the switching units of the switching tubes, the grid electrode of each main MOS tube is connected with the first controlled end, the source electrode is connected with the second connecting end, and the drain electrode is used for connecting a load.
The resonant driving circuit provided by the embodiment of the invention has at least the following beneficial effects:
the transformer isolation unit is used for providing isolated multipath output; the main MOS tube is driven by the transformer isolation unit and resonates with a secondary winding unit of the transformer isolation unit; the switching unit of the switching tube can be conducted in the positive half-cycle waveform and turned off in the negative half-cycle waveform, so that resonance generated by the main MOS tube only keeps the positive half-cycle waveform. According to the resonant driving circuit provided by the embodiment of the invention, the high-frequency resonant driving can be realized by driving the input unit, the transformer isolation unit, the plurality of switching tube switching units and the plurality of main MOS tubes, and only the positive pressure part of the resonant waveform is reserved, so that the circuit can be suitable for special occasions such as aerospace occasions and the like where the negative pressure of the driving end of the MOS tube is not allowed. Meanwhile, a plurality of secondary winding units of the transformer isolation unit can realize multi-path output and can be externally connected with multi-path loads. In addition, the technical scheme of the invention has simple and reliable circuit, easy realization, high cost performance and higher practical value.
According to some embodiments of the invention, each switching tube switching unit comprises a first switching tube, a grid electrode of the first switching tube is connected with a first end corresponding to the secondary winding unit, a drain electrode of the first switching tube is connected with a second end corresponding to the secondary winding unit, and a source electrode of the first switching tube is correspondingly connected with a source electrode of the main MOS tube.
According to some embodiments of the invention, each of the switching tube switching units further comprises a first resistor connected in series between the gate of the first switching tube and the first end of the secondary winding unit.
According to some embodiments of the invention, the first switching tube is a MOS tube.
According to some embodiments of the invention, the primary winding unit comprises:
the first primary winding is connected with a first working voltage at a first end and connected with the driving input unit at a second end;
the first end of the second primary winding is used for being connected with a first working voltage, and the second end of the second primary winding is used for being connected with the driving input unit; the first primary winding and the second primary winding are symmetrical windings.
According to some embodiments of the invention, the driving input unit includes:
the first driving subunit is provided with a first driving subunit input end and a first driving subunit output end, the first driving subunit input end is used for being connected with a first driving control signal, and the first driving subunit output end is connected with the second end of the first primary winding;
the second driving subunit is provided with a second driving sub-input end and a second driving sub-output end, the second driving sub-input end is used for being connected with a second driving control signal, and the second driving sub-output end is connected with the second end of the second primary winding.
According to some embodiments of the invention, the first driving subunit includes a second switching tube, a gate of which is used for accessing the first driving control signal, a source of which is connected to a ground line, and a drain of which is connected to a second end of the first primary winding.
According to some embodiments of the invention, the second driving subunit includes a third switching tube, a gate of which is used for accessing the second driving control signal, a source of which is connected to a ground line, and a drain of which is connected to a second end of the second primary winding.
According to some embodiments of the invention, the first and second drive control signals employ PWM signals.
A switching power supply according to an embodiment of the second aspect of the invention comprises a resonant drive circuit as described in the embodiment of the first aspect. The switching power supply according to the embodiment of the present invention includes the resonant driving circuit according to the embodiment of the first aspect, and thus has all the advantages of the resonant driving circuit according to the embodiment of the first aspect.
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 foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a circuit diagram of a resonant driving circuit according to an embodiment of the present invention.
Reference numerals:
a drive input unit 100,
Transformer isolation unit 200,
And a switching tube switching unit 300.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, the description of first, second, etc. is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, it should be understood that the direction or positional relationship indicated with respect to the description of the orientation, such as up, down, etc., is based on the direction or positional relationship shown in the drawings, is merely for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the apparatus 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, unless clearly defined, set up, installed, connected and other words should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present invention in combination with the specific contents of the technical scheme.
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings, in which it is apparent that the embodiments described below are some, but not all embodiments of the invention.
Referring to fig. 1, fig. 1 is a circuit diagram of a resonant driving circuit according to an embodiment of the present invention, where the resonant driving circuit includes a driving input unit 100, a transformer isolation unit 200, a plurality of switching tube switching units 300, and a plurality of main MOS tubes;
a driving input unit 100 having a driving input end for inputting a driving control signal, and a driving output end, the driving input unit 100 for outputting a driving excitation signal according to the driving control signal and outputting by the driving output end;
the transformer isolation unit 200 is provided with a primary winding unit and a plurality of secondary winding units, and the primary winding unit is connected with the driving output end;
the switching units 300 are arranged in a one-to-one correspondence manner with the secondary winding units, and each switching unit is provided with a first connecting end, a second connecting end and a first controlled end, and the first connecting end and the first controlled end are connected with the corresponding secondary winding unit;
the multiple main MOS tubes are arranged in one-to-one correspondence with the multiple switching tube switching units 300, the grid electrode of each main MOS tube is connected with the first controlled end, the source electrode is connected with the second connecting end, and the drain electrode is used for connecting a load.
Specifically, the driving input unit 100 is connected with an external driving control signal and the transformer isolation unit 200, respectively, wherein the driving input unit 100 is connected with a primary winding unit of the transformer isolation unit 200; the transformer isolation unit 200 is respectively connected with the driving input unit 100 and the plurality of switching tube switching units 300, wherein a primary winding unit of the transformer isolation unit 200 is connected with the driving input unit 100, and a plurality of secondary winding units of the transformer isolation unit 200 are respectively connected with the plurality of switching tube switching units 300 in a one-to-one correspondence manner; the plurality of switching tube switching units 300 are respectively connected with the transformer isolation unit 200 and the plurality of main MOS tubes, wherein the plurality of switching tube switching units 300 are respectively connected with the plurality of secondary winding units of the transformer isolation unit 200 in a one-to-one correspondence manner; each of the plurality of main MOS transistors is connected to a corresponding one of the switching transistor switching units 300 and the load, respectively.
Specifically, the external driving control signal is connected to the driving input unit 100 to drive the circuit, the driving input unit 100 outputs a driving excitation signal according to the driving control signal, the transformer isolation unit 200 is excited by the signal, the transformer isolation unit 200 isolates and transmits the signal input into the primary winding unit to the multiple secondary winding units to provide isolated multiple outputs, wherein the winding inductance of each secondary winding unit resonates with the parasitic capacitance of a corresponding main MOS tube, and the switching tube switching unit 300 can realize on and off in the positive half cycle of the resonance, so that the main MOS tube generates resonance and only retains the waveform of the positive half cycle.
The driving input unit 100 is used for accessing a driving control signal and exciting a transformer isolation unit 200; the transformer isolation unit 200 is used for providing isolated multiplexing output; the main MOS tube is driven by the transformer isolation unit 200 and resonates with a secondary winding unit of the transformer isolation unit 200; the switching unit 300 may be turned on in the positive half cycle waveform and turned off in the negative half cycle waveform, so that the main MOS transistor resonates and only retains the positive half cycle waveform. According to the resonant driving circuit provided by the embodiment of the invention, the input unit 100, the transformer isolation unit 200, the plurality of switching tube switching units 300 and the plurality of main MOS tubes are driven, so that high-frequency resonant driving can be realized, and only the positive pressure part of a resonant waveform is reserved, and the circuit can be suitable for special occasions where negative pressure is not allowed to exist at the driving end of the MOS tube, such as aerospace occasions and the like. Meanwhile, multiple secondary winding units of the transformer isolation unit 200 can realize multi-path output and can be externally connected with multi-path loads. In addition, the technical scheme of the invention has simple and reliable circuit, easy realization, high cost performance and higher practical value.
As shown in fig. 1, in some embodiments, each switching tube switching unit 300 includes a first switching tube, a gate of the first switching tube is connected to a first end of a corresponding secondary winding unit, a drain of the first switching tube is connected to a second end of the corresponding secondary winding unit, and a source of the first switching tube is correspondingly connected to a source of a corresponding main MOS tube. Each switching tube unit is composed of a first switching tube, and because the first switching tube is arranged between the source electrode of the main MOS tube and the secondary winding unit, when the first switching tube is turned off, namely the drain electrode and the source electrode of the first switching tube are not conducted, the connection between the source electrode of the MOS tube and the secondary winding unit is cut off. Therefore, when the first switching tube is in an on state in the positive half cycle of the resonance waveform, the main MOS tube is normally conducted and generates resonance, resonance current can flow positively and negatively, when the first switching tube is in an off state in the negative half cycle of the resonance waveform, the resonance state is cut off, negative pressure cannot be added to the main MOS tube due to the cut-off of the first switching tube, and therefore resonance in only the positive half cycle and cut-off of the negative half cycle are achieved, and only the driving waveform in the positive half cycle is reserved. The switching tube unit adopts a switching tube to realize the function of retaining the positive half-cycle waveform and the negative half-cycle cutoff, and has the advantages of simple and reliable structure, stability, effectiveness, high cost performance and strong practicability.
As shown in fig. 1, in some embodiments, each switching tube switching unit 300 further includes a first resistor connected in series between the gate of the first switching tube and the first end of the secondary winding unit. Because the switch tube can absorb large current in the conducting state, the overload condition of the circuit can be caused, and therefore, the first resistor is added between the grid electrode of the first switch tube and the secondary winding unit to play a role in limiting current, and the damage to the first switch tube caused by overlarge conducting current of the first switch tube can be effectively prevented by adjusting the resistance value of the first resistor. The switching tube has higher voltage bearing capacity in the cut-off state, but when the switching tube is in the conduction state, the voltage bearing capacity is also reduced, so that a first resistor is added between the grid electrode of the first switching tube and the secondary winding unit, a part of voltage in the circuit can be shared, and the first switching tube is prevented from being damaged due to overvoltage. By adding the first resistor, the protection effect of the switch tube is achieved.
In some embodiments, the first switching tube is a MOS tube. A common type of switching tube is MOSFET, BJT, IGBT, wherein a MOSFET, i.e., a MOS tube, is the most commonly used switching tube, and there are several types of NMOS, PMOS, and the like. The MOS tube has the advantages of high switching speed, high response speed, small control current and the like, and is widely applied to various electronic devices.
As shown in fig. 1, in some embodiments, the primary winding unit includes a first primary winding and a second primary winding;
a first primary winding having a first end for being connected to a first operating voltage and a second end for being connected to the driving input unit 100;
a second primary winding having a first end for being connected to a first operating voltage and a second end for being connected to the driving input unit 100; the first primary winding and the second primary winding are symmetrical windings.
The primary winding unit adopts two-phase symmetrical winding to make the shape and size of the coil consistent, so that the magnetic field generated by symmetrical components is uniformly distributed, thereby being beneficial to improving electromagnetic environment, improving transmission quality and improving stability. Meanwhile, as the primary winding units are symmetrical windings, the multiple groups of secondary winding units are symmetrical windings, and the stability of the whole work of the circuit is improved.
In some embodiments, the drive input unit 100 includes a first drive subunit and a second drive subunit;
the first driving subunit is provided with a first driving subunit input end and a first driving subunit output end, the first driving subunit input end is used for being connected with a first driving control signal, and the first driving subunit output end is connected with the second end of the first primary winding;
the second driving subunit is provided with a second driving sub-input end and a second driving sub-output end, the second driving sub-input end is used for being connected with a second driving control signal, and the second driving sub-output end is connected with the second end of the second primary winding.
The driving input unit 100 is composed of two driving sub-units which drive the first primary winding and the second primary winding, respectively.
In some embodiments, as shown in fig. 1, the first driving subunit includes a second switching tube, a gate of which is used for accessing the first driving control signal, a source of which is connected to the ground, and a drain of which is connected to the second end of the first primary winding.
In some embodiments, as shown in fig. 1, the second driving subunit includes a third switching tube, a gate of which is used for accessing the second driving control signal, a source of which is connected to the ground, and a drain of which is connected to the second end of the second primary winding.
In some embodiments, the second switching tube adopted by the first driving subunit and the third switching tube adopted by the second driving subunit can be MOS tubes, and the MOS tubes have the advantages of high switching speed, high response speed, small control current and the like and are widely applied to various electronic devices.
In some embodiments, the first drive control signal and the second drive control signal employ PWM signals. The PWM signal has the advantages of wide speed regulation range, good rapidity, good waveform coefficient, good power factor, strong noise immunity and the like, and is widely applied as a driving control signal. The circuit adopts two independent PWM signals for control, can realize accurate control on output voltage and frequency by respectively adjusting the duty ratio of the two PWM signals, and can realize higher output frequency, so that the circuit can adapt to more different load requirements and working conditions, and improves the flexibility, efficiency, stability and reliability of driving control signals.
In some embodiments, the application range of the resonant driving circuit is a MOS transistor driving circuit of a high-frequency switching power supply. In some embodiments, the resonant drive circuit is applied in a switching power supply drive circuit having a switching frequency in excess of 1 MHz.
In order to better describe the resonant driving circuit of the embodiments of the present invention, a further description is provided herein by way of specific embodiments.
Referring to fig. 1, a gate of the second switching tube Q1 is connected to the first driving control signal PWM1, a source of the second switching tube Q1 is grounded, a drain of the second switching tube Q1 is connected to one end of a first primary winding P1 of the isolation transformer TX, another end of the first primary winding P1 is connected to the first operating voltage VCC, a gate of the third switching tube Q2 is connected to the second driving control signal PWM2, a source of the third switching tube Q2 is grounded, a drain of the third switching tube Q2 is connected to one end of a second primary winding P2 of the isolation transformer TX, another end of the second primary winding P2 is connected to the first operating voltage VCC, the isolation transformer TX has N sets of secondary windings N1, N2.
PWM1, PWM2 are used as the drive signal to drive the second switching tube Q1 and the third switching tube Q2, thus carry on the signal excitation to the driving transformer TX, the winding inductance of every secondary winding of the driving transformer TX and parasitic capacitance of a correspondent main MOS tube Qm1 produce resonance, take a series of secondary windings N1 as an example to explain specifically, other secondary windings are the same, the winding inductance of the secondary winding N1 produces resonance with parasitic capacitance of the main MOS tube Qm1, if there is no first switching tube Qg1 in the circuit, produce the sine wave drive signal in the grid of the main MOS tube Qm1, but the invention has increased the first switching tube Qg1 in the circuit and used for eliminating the negative pressure signal of the grid of the main MOS tube Qm 1.
When the resonance waveform is in the positive half cycle, the first switching tube Qg1 is in an on state, the main MOS tube Qm1 is normally conducted, and resonance current can flow positively and negatively; when the resonance waveform is in the negative half cycle, the first switching tube Qg1 is in a closed state, the resonance state is cut off, negative pressure cannot be added to the grid electrode of the main MOS tube Qm1 due to the cut-off of the first switching tube Qg1, therefore, resonance of only the positive half cycle is realized, the cut-off of the negative half cycle is realized, and only the driving waveform of the positive half cycle is reserved.
The embodiment of the invention also provides a switching power supply which comprises the resonant driving circuit. The switching power supply according to the embodiment of the present invention includes the resonant driving circuit according to the above embodiment, and thus has all the advantages of the resonant driving circuit according to the embodiment of the first aspect.
The resonant driving circuit is added for the switching power supply circuit, so that high-frequency resonant driving can be realized, and only the positive pressure part of the resonant waveform is reserved, and the circuit can be suitable for special occasions such as aerospace occasions and the like where the negative pressure of the driving end of the MOS tube is not allowed. In addition, the technical scheme of the invention has simple and reliable circuit and higher practical value.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., 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 invention. 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.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the embodiments, and those skilled in the art will appreciate that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A resonant drive circuit, comprising:
the driving input unit is provided with a driving input end and a driving output end, wherein the driving input end is used for inputting a driving control signal, and the driving input unit is used for outputting a driving excitation signal according to the driving control signal and outputting the driving excitation signal by the driving output end;
the transformer isolation unit is provided with a primary winding unit and a plurality of secondary winding units, and the primary winding unit is connected with the driving output end;
the switching units are arranged in one-to-one correspondence with the secondary winding units, each switching unit is provided with a first connecting end, a second connecting end and a first controlled end, and the first connecting end and the first controlled end are connected with the corresponding secondary winding unit;
the main MOS tubes are arranged in one-to-one correspondence with the switching units of the switching tubes, the grid electrode of each main MOS tube is connected with the first controlled end, the source electrode is connected with the second connecting end, and the drain electrode is used for connecting a load.
2. The resonant drive circuit of claim 1, wherein each of the switching tube switching units comprises a first switching tube, a gate of the first switching tube is connected with a first end corresponding to the secondary winding unit, a drain of the first switching tube is connected with a second end corresponding to the secondary winding unit, and a source of the first switching tube is correspondingly connected with a source of the main MOS tube.
3. The resonant drive circuit of claim 2, wherein each of the switching tube switching units further comprises a first resistor connected in series between the gate of the first switching tube and the first end of the secondary winding unit.
4. A resonant drive circuit according to claim 2 or 3, wherein the first switching tube is a MOS tube.
5. The resonant drive circuit of claim 1, wherein the primary winding unit comprises:
the first primary winding is connected with a first working voltage at a first end and connected with the driving input unit at a second end;
the first end of the second primary winding is used for being connected with a first working voltage, and the second end of the second primary winding is used for being connected with the driving input unit; the first primary winding and the second primary winding are symmetrical windings.
6. The resonant drive circuit of claim 5, wherein the drive input unit comprises:
the first driving subunit is provided with a first driving subunit input end and a first driving subunit output end, the first driving subunit input end is used for being connected with a first driving control signal, and the first driving subunit output end is connected with the second end of the first primary winding;
the second driving subunit is provided with a second driving sub-input end and a second driving sub-output end, the second driving sub-input end is used for being connected with a second driving control signal, and the second driving sub-output end is connected with the second end of the second primary winding.
7. The resonant drive circuit of claim 6, wherein the first drive subunit comprises a second switching tube having a gate for accessing the first drive control signal, a source connected to ground, and a drain connected to the second end of the first primary winding.
8. The resonant drive circuit of claim 6, wherein the second drive subunit comprises a third switching tube having a gate for accessing the second drive control signal, a source connected to ground, and a drain connected to the second end of the second primary winding.
9. The resonant drive circuit of claim 6 or 7 or 8, wherein the first and second drive control signals employ PWM signals.
10. A switching power supply comprising a resonant drive circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311719769.4A CN117833677A (en) | 2023-12-13 | 2023-12-13 | Resonant driving circuit and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311719769.4A CN117833677A (en) | 2023-12-13 | 2023-12-13 | Resonant driving circuit and switching power supply |
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| Publication Number | Publication Date |
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| CN117833677A true CN117833677A (en) | 2024-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202311719769.4A Pending CN117833677A (en) | 2023-12-13 | 2023-12-13 | Resonant driving circuit and switching power supply |
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| CN (1) | CN117833677A (en) |
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- 2023-12-13 CN CN202311719769.4A patent/CN117833677A/en active Pending
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