CN216751535U - DC-DC buck converter - Google Patents
DC-DC buck converter Download PDFInfo
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- CN216751535U CN216751535U CN202122171126.3U CN202122171126U CN216751535U CN 216751535 U CN216751535 U CN 216751535U CN 202122171126 U CN202122171126 U CN 202122171126U CN 216751535 U CN216751535 U CN 216751535U
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Abstract
The utility model discloses a DC-DC buck converter, which comprises a main power switch tube, a controllable follow current switch tube, an energy storage inductor, a magnetic core, a driving winding, a driving diode, a driving resistor, a positive input end, a positive output end and a grounding end, wherein the main power switch tube is connected with the main power switch tube; the driving winding is coupled with the energy storage inductor through the magnetic core; the drain electrode of the main power switch tube is a positive input end, the source electrode of the main power switch tube is simultaneously connected with the drain electrode of the main power switch tube and the homonymous end of the energy storage inductor, the heteronymous end of the energy storage inductor is a positive output end, the heteronymous end of the driving winding is connected with the anode of the driving diode, the cathode of the driving diode is simultaneously connected with one end of the driving resistor and the control end of the controllable follow current switch tube, and the homonymous end of the driving winding, the other end of the resistor and the source electrode of the controllable follow current switch tube are connected together to form a grounding end. The circuit has simple structure and low realization cost, can realize the synchronous conduction of the controllable follow current switch tube by only adding a small number of components, and can obviously improve the conversion efficiency of the converter.
Description
Technical Field
The utility model relates to a driving circuit of a switching power supply converter, which can obviously improve the efficiency of the switching power supply converter.
Background
Fig. 1 is a schematic diagram of a conventional DC-DC buck converter circuit, where the main power circuit includes only four components, i.e., a main power switch Q1, a freewheeling switch D1, an energy storage inductor L1, and an output filter capacitor C1, where R2 is a load, U1 is a main control chip, and the main control chip U1 drives the main power switch Q1 to turn on or off at a certain duty ratio.
The circuit structure shown in fig. 1 is simple and highly reliable, but the freewheeling switch D1 is a diode, and because the diode is turned on and has a voltage drop, and has a reverse recovery problem, the loss is large, resulting in low overall efficiency of the converter.
SUMMERY OF THE UTILITY MODEL
Accordingly, the present invention is directed to a DC-DC buck converter, which can significantly improve the overall efficiency of the converter and still has a simple circuit structure.
In order to achieve the above object, a first technical solution of the present invention is as follows:
a DC-DC buck converter, characterized by: the power supply comprises a main power switch tube Q1, a controllable follow current switch tube Q2, an energy storage inductor L1, a magnetic core T1, a driving winding L2, a driving diode D2, a driving resistor R1, a positive input end, a positive output end and a ground end; the driving winding L2 is coupled with the energy storage inductor L1 through the magnetic core T1; the drain of the main power switch Q1 is the positive input terminal, the source of the main power switch Q1 is connected to the drain of the controllable freewheeling switch Q2 and the dotted terminal of the energy storage inductor L1, the dotted terminal of the energy storage inductor L1 is the positive output terminal, the dotted terminal of the driving winding L2 is connected to the anode of the driving diode D2, the cathode of the driving diode D2 is connected to one end of the driving resistor R1 and the control terminal of the controllable freewheeling switch Q2, and the dotted terminal of the driving winding L2, the other end of the resistor R1 and the source of the controllable freewheeling switch Q2 are connected together to serve as the ground terminal.
In order to achieve the above object, a second technical solution of the present invention is as follows:
a DC-DC buck converter, characterized by: the controllable follow current switch tube type three-phase inverter comprises a main power switch tube Q1, a controllable follow current switch tube Q2, an energy storage inductor L1, a magnetic core T1, a driving winding L2, a driving diode D2, a driving resistor R1, a positive input end, a negative input end, a positive output end and a negative output end; the driving winding L2 is coupled with the energy storage inductor L1 through the magnetic core T1; the drain of the main power switch Q2 and the dotted terminal of the energy storage inductor L1 are connected together as the positive input terminal, the dotted terminal of the energy storage inductor L1 is used as the positive output terminal, the dotted terminal of the driving winding L2 is connected to the anode of the driving diode D2, the cathode of the driving diode D2 is connected to one end of the driving resistor R1 and the control terminal of the controllable freewheeling switch Q2, the dotted terminal of the driving winding L2, the other end of the resistor R1, the source of the controllable freewheeling switch Q2 and the drain of the main power switch Q1 are connected together as the negative output terminal, and the source of the main power switch Q1 is used as the negative input terminal.
In order to achieve the above object, a third technical solution of the present invention is as follows:
a DC-DC buck converter, characterized by: the controllable follow current switch tube type three-phase inverter comprises a main power switch tube Q1, a controllable follow current switch tube Q2, an energy storage inductor L1, a magnetic core T1, a driving winding L2, a driving diode D2, a driving resistor R1, a positive input end, a negative input end, a positive output end and a negative output end; the driving winding L2 is coupled with the energy storage inductor L1 through the magnetic core T1; the drain of the main power switch Q1 is the positive input terminal, the source of the main power switch Q1 is connected to the drain of the controllable freewheeling switch Q2 at the same time as the positive output terminal, the synonym of the driving winding L2 is connected to the anode of the driving diode D2, the cathode of the driving diode D2 is connected to one end of the driving resistor R1 and the control end of the controllable freewheeling switch Q2 at the same time, the synonym of the energy storage inductor L1, the synonym of the driving winding L2, the other end of the driving resistor R1 and the source of the controllable freewheeling switch Q2 are connected together as the negative input terminal, and the synonym of the energy storage inductor L1 is connected to the negative output terminal.
In order to achieve the above object, a fourth technical solution of the present invention is as follows:
a DC-DC buck converter, characterized by: the controllable follow current switch tube type three-phase inverter comprises a main power switch tube Q1, a controllable follow current switch tube Q2, an energy storage inductor L1, a magnetic core T1, a driving winding L2, a driving diode D2, a driving resistor R1, a positive input end, a negative input end, a positive output end and a negative output end; the driving winding L2 is coupled with the energy storage inductor L1 through the magnetic core T1; the controllable follow current switch tube Q2 has a drain serving as the positive input end and the positive output end at the same time, the synonym end of the drive winding L2 is connected with the anode of the drive diode D2, the cathode of the drive diode D2 is connected with one end of the drive resistor R1 and the control end of the controllable follow current switch tube Q2 at the same time, the synonym end of the energy storage inductor L1, the synonym end of the drive winding L2, the other end of the resistor R1 and the source of the controllable follow current switch tube Q2 are connected with the drain of the main power switch tube Q1 at the same time, the source of the main power switch tube Q1 serves as the negative input end, and the synonym end of the energy storage inductor L1 serves as the negative output end.
Preferably, the main power switch Q1 and the controllable freewheeling switch Q2 are both MOS transistors.
The working principle of the utility model will be analyzed in detail by combining with specific embodiments, which are not described herein, and compared with the prior art, the utility model has the following beneficial effects:
(1) the synchronous conduction of the controllable follow current switching tube can be realized only by adding a small number of components, so that the conversion efficiency of the converter can be obviously improved;
(2) the circuit structure is still simple, and the realization cost is low.
Drawings
FIG. 1 is a schematic diagram of a conventional DC-DC buck converter circuit;
FIG. 2 is a schematic circuit diagram of a first embodiment of a DC-DC buck converter according to the present invention;
FIG. 3 is a schematic circuit diagram of a DC-DC buck converter according to a second embodiment of the present invention;
FIG. 4 is a circuit schematic of a third embodiment of a DC-DC buck converter according to the present invention;
fig. 5 is a schematic circuit diagram of a DC-DC buck converter according to a fourth embodiment of the present invention.
Detailed Description
Embodiments of the utility model will be further described with reference to the accompanying drawings in which:
first embodiment
Fig. 2 is a schematic circuit diagram of a DC-DC buck converter according to a first embodiment of the present invention, which includes a main power switch Q1, a controllable freewheeling switch Q2, an energy storage inductor L1, a magnetic core T1, a driving winding L2, a driving diode D2, a driving resistor R1, a positive input terminal Vin +, a positive output terminal Vo +, and a ground terminal; the driving winding L2 is coupled with the energy storage inductor L1 through the magnetic core T1; the drain of the main power switch tube Q1 is used as a positive input terminal Vin +, the source of the main power switch tube Q1 is simultaneously connected with the drain of the controllable freewheeling switch tube Q2 and the dotted terminal of the energy storage inductor L1, the dotted terminal of the energy storage inductor L1 is used as a positive output terminal Vo +, the dotted terminal of the driving winding L2 is connected with the anode of the driving diode D2, the cathode of the driving diode D2 is simultaneously connected with one end of the driving resistor R1 and the control end of the controllable freewheeling switch tube Q2, and the dotted terminal of the driving winding L2, the other end of the resistor R1 and the source of the controllable freewheeling switch tube Q2 are connected together to be used as a ground terminal.
The main power switch tube Q1 and the controllable follow current switch tube Q2 of this embodiment are MOS tubes, and the gates of the MOS tubes are control ends.
The working principle of the embodiment is as follows:
when the main power switch tube Q1 is turned on, the input voltage Vin outputs energy to the load R2 through the energy storage inductor L1, the energy storage inductor L1 stores energy, and induces a negative voltage in the driving winding L2, at this time, the driving diode D2 is turned off, and the controllable follow current switch tube Q2 is turned off;
when the main power switch tube Q1 is turned off, the input voltage Vin is disconnected from the load R2, the energy storage inductor L1 continues to supply energy to the load R2, and a positive voltage is induced in the driving winding L2, at this time, the driving diode D2 is turned on, and the controllable follow current switch tube Q2 is turned on;
this completes a switching cycle.
Second embodiment
Fig. 3 is a schematic circuit diagram of a DC-DC buck converter according to a second embodiment of the present invention, which includes a main power switch Q1, a controllable freewheeling switch Q2, an energy storage inductor L1, a magnetic core T1, a driving winding L2, a driving diode D2, a driving resistor R1, a positive input terminal Vin +, a negative input terminal Vin-, a positive output terminal Vo +, and a negative output terminal Vo-; the driving winding L2 is coupled with the energy storage inductor L1 through the magnetic core T1; the drain of the main power switch tube Q2 and the dotted terminal of the energy storage inductor L1 are connected together to form a positive input terminal Vin +, the dotted terminal of the energy storage inductor L1 is used as a positive output terminal Vo +, the dotted terminal of the driving winding L2 is connected with the anode of the driving diode D2, the cathode of the driving diode D2 is simultaneously connected with one end of the driving resistor R1 and the control terminal of the controllable follow current switch tube Q2, the dotted terminal of the driving winding L2, the other end of the resistor R1, the source of the controllable follow current switch tube Q2 and the drain of the main power switch tube Q1 are connected together to form a negative output terminal Vo-, and the source of the main power switch tube Q1 is used as a negative input terminal Vin-.
The main power switch tube Q1 and the controllable follow current switch tube Q2 of this embodiment are MOS tubes, and the gates of the MOS tubes are control ends.
The working principle of the embodiment is as follows:
when the main power switch tube Q1 is turned on, the input voltage Vin outputs energy to the load R2 through the energy storage inductor L1, the energy storage inductor L1 stores energy, and induces a negative voltage in the driving winding L2, at this time, the driving diode D2 is turned off, and the controllable follow current switch tube Q2 is turned off;
when the main power switch tube Q1 is turned off, the input voltage Vin is disconnected from the load R2, the energy storage inductor L1 continues to supply energy to the load R2, and a positive voltage is induced in the driving winding L2, at this time, the driving diode D2 is turned on, and the controllable follow current switch tube Q2 is turned on;
this completes a switching cycle.
Third embodiment
As shown in fig. 4, which is a schematic circuit diagram of a DC-DC buck converter according to a third embodiment of the present invention, the DC-DC buck converter includes a main power switch Q1, a controllable freewheeling switch Q2, an energy storage inductor L1, a magnetic core T1, a driving winding L2, a driving diode D2, a driving resistor R1, a positive input terminal Vin +, a negative input terminal Vin-, a positive output terminal Vo +, and a negative output terminal Vo-; the driving winding L2 is coupled with the energy storage inductor L1 through the magnetic core T1; the drain of the main power switch tube Q1 is used as a positive input end Vin +, the source of the main power switch tube Q1 is simultaneously connected with the drain of the controllable follow current switch tube Q2 and the positive output end Vo +, the synonym end of the driving winding L2 is connected with the anode of the driving diode D2, the cathode of the driving diode D2 is simultaneously connected with one end of the driving resistor R1 and the control end of the controllable follow current switch tube Q2, the synonym end of the energy storage inductor L1, the synonym end of the driving winding L2, the other end of the resistor R1 and the source of the controllable follow current switch tube Q2 are connected together to be used as a negative input end, and the synonym end of the Vin energy storage inductor L1 is used as a negative output end Vo-.
The main power switch tube Q1 and the controllable follow current switch tube Q2 of this embodiment are MOS tubes, and the gates of the MOS tubes are control ends.
The working principle of the embodiment is as follows:
when the main power switch tube Q1 is turned on, the input voltage Vin outputs energy to the load R2 through the energy storage inductor L1, the energy storage inductor L1 stores energy, and induces a negative voltage in the driving winding L2, at this time, the driving diode D2 is turned off, and the controllable follow current switch tube Q2 is turned off;
when the main power switch tube Q1 is turned off, the input voltage Vin is disconnected from the load R2, the energy storage inductor L1 continues to supply energy to the load R2, and a positive voltage is induced in the driving winding L2, at this time, the driving diode D2 is turned on, and the controllable follow current switch tube Q2 is turned on;
this completes a switching cycle.
Fourth embodiment
Fig. 5 is a schematic circuit diagram of a DC-DC buck converter according to a fourth embodiment of the present invention, which includes a main power switch Q1, a controllable freewheeling switch Q2, an energy storage inductor L1, a magnetic core T1, a driving winding L2, a driving diode D2, a driving resistor R1, a positive input terminal Vin +, a negative input terminal Vin-, a positive output terminal Vo +, and a negative output terminal Vo-; the driving winding L2 is coupled with the energy storage inductor L1 through the magnetic core T1; the drain of the controllable follow current switching tube Q2 is used as a positive input end Vin + and a positive output end Vo +, the synonym end of the driving winding L2 is connected with the anode of the driving diode D2, the cathode of the driving diode D2 is connected with one end of the driving resistor R1 and the control end of the controllable follow current switching tube Q2, the synonym end of the energy storage inductor L1, the synonym end of the driving winding L2, the other end of the resistor R1 and the source of the controllable follow current switching tube Q2 are connected with the drain of the main power switching tube Q1, the source of the main power switching tube Q1 is used as a negative input end, and the synonym end of the Vin energy storage inductor L1 is used as a negative output end Vo-.
The main power switch tube Q1 and the controllable follow current switch tube Q2 of this embodiment are MOS tubes, and the gates of the MOS tubes are control ends.
The working principle of the embodiment is as follows:
when the main power switch tube Q1 is turned on, the input voltage Vin outputs energy to the load R2 through the energy storage inductor L1, the energy storage inductor L1 stores energy, and induces a negative voltage in the driving winding L2, at this time, the driving diode D2 is turned off, and the controllable follow current switch tube Q2 is turned off;
when the main power switch tube Q1 is turned off, the input voltage Vin is disconnected from the load R2, the energy storage inductor L1 continues to supply energy to the load R2, and a positive voltage is induced in the driving winding L2, at this time, the driving diode D2 is turned on, and the controllable follow current switch tube Q2 is turned on;
this completes a switching cycle.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes, modifications and improvements may be made without departing from the spirit and scope of the utility model.
Claims (5)
1. A DC-DC buck converter, characterized by: the power supply comprises a main power switch tube Q1, a controllable follow current switch tube Q2, an energy storage inductor L1, a magnetic core T1, a driving winding L2, a driving diode D2, a driving resistor R1, a positive input end, a positive output end and a ground end; the driving winding L2 is coupled with the energy storage inductor L1 through the magnetic core T1; the drain of the main power switch Q1 is the positive input terminal, the source of the main power switch Q1 is connected to the drain of the main power switch Q2 and the dotted terminal of the energy storage inductor L1, the dotted terminal of the energy storage inductor L1 is the positive output terminal, the dotted terminal of the driving winding L2 is connected to the anode of the driving diode D2, the cathode of the driving diode D2 is connected to one end of the driving resistor R1 and the control terminal of the controllable freewheeling switch Q2, and the dotted terminal of the driving winding L2, the other end of the resistor R1 and the source of the controllable freewheeling switch Q2 are connected together to serve as the ground terminal.
2. A DC-DC buck converter, characterized by: the controllable follow current switch tube type three-phase inverter comprises a main power switch tube Q1, a controllable follow current switch tube Q2, an energy storage inductor L1, a magnetic core T1, a driving winding L2, a driving diode D2, a driving resistor R1, a positive input end, a negative input end, a positive output end and a negative output end; the driving winding L2 is coupled with the energy storage inductor L1 through the magnetic core T1; the drain of the controllable freewheeling switch Q2 and the dotted terminal of the energy storage inductor L1 are connected together as the positive input terminal, the dotted terminal of the energy storage inductor L1 is used as the positive output terminal, the dotted terminal of the driving winding L2 is connected to the anode of the driving diode D2, the cathode of the driving diode D2 is connected to one end of the driving resistor R1 and the control terminal of the controllable freewheeling switch Q2, the dotted terminal of the driving winding L2, the other end of the resistor R1, the source of the controllable freewheeling switch Q2 and the drain of the main power switch Q1 are connected together as the negative output terminal, and the source of the main power switch Q1 is used as the negative input terminal.
3. A DC-DC buck converter, characterized by: the controllable follow current switch tube type three-phase inverter comprises a main power switch tube Q1, a controllable follow current switch tube Q2, an energy storage inductor L1, a magnetic core T1, a driving winding L2, a driving diode D2, a driving resistor R1, a positive input end, a negative input end, a positive output end and a negative output end; the driving winding L2 is coupled with the energy storage inductor L1 through the magnetic core T1; the drain of the main power switch tube Q1 is used as the positive input end, the source of the main power switch tube Q1 is connected to the drain of the controllable freewheeling switch tube Q2 and the positive output end at the same time, the synonym end of the driving winding L2 is connected to the anode of the driving diode D2, the cathode of the driving diode D2 is connected to one end of the driving resistor R1 and the control end of the controllable freewheeling switch tube Q2 at the same time, the synonym end of the energy storage inductor L1, the synonym end of the driving winding L2, the other end of the resistor R1 and the source of the controllable freewheeling switch tube Q2 are connected together to be used as the negative input end, and the synonym end of the energy storage inductor L1 is used as the negative output end.
4. A DC-DC buck converter, characterized by: the controllable follow current switch tube type three-phase inverter comprises a main power switch tube Q1, a controllable follow current switch tube Q2, an energy storage inductor L1, a magnetic core T1, a driving winding L2, a driving diode D2, a driving resistor R1, a positive input end, a negative input end, a positive output end and a negative output end; the driving winding L2 is coupled with the energy storage inductor L1 through the magnetic core T1; the controllable follow current switch tube Q2 has a drain serving as the positive input end and the positive output end at the same time, the synonym end of the drive winding L2 is connected with the anode of the drive diode D2, the cathode of the drive diode D2 is connected with one end of the drive resistor R1 and the control end of the controllable follow current switch tube Q2 at the same time, the synonym end of the energy storage inductor L1, the synonym end of the drive winding L2, the other end of the resistor R1 and the source of the controllable follow current switch tube Q2 are connected with the drain of the main power switch tube Q1 at the same time, the source of the main power switch tube Q1 serves as the negative input end, and the synonym end of the energy storage inductor L1 serves as the negative output end.
5. The DC-DC buck converter according to any one of claims 1 to 4, wherein: the main power switch tube Q1 and the controllable follow current switch tube Q2 are both MOS tubes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122171126.3U CN216751535U (en) | 2021-09-09 | 2021-09-09 | DC-DC buck converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122171126.3U CN216751535U (en) | 2021-09-09 | 2021-09-09 | DC-DC buck converter |
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| Publication Number | Publication Date |
|---|---|
| CN216751535U true CN216751535U (en) | 2022-06-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122171126.3U Active CN216751535U (en) | 2021-09-09 | 2021-09-09 | DC-DC buck converter |
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|---|---|
| CN (1) | CN216751535U (en) |
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2021
- 2021-09-09 CN CN202122171126.3U patent/CN216751535U/en active Active
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