CN212323982U - One-way conduction circuit and switching power supply using same - Google Patents
One-way conduction circuit and switching power supply using same Download PDFInfo
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- CN212323982U CN212323982U CN202021055531.8U CN202021055531U CN212323982U CN 212323982 U CN212323982 U CN 212323982U CN 202021055531 U CN202021055531 U CN 202021055531U CN 212323982 U CN212323982 U CN 212323982U
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Abstract
The utility model provides a one-way conduction circuit, be applied to switching power supply, supply voltage supplies power for switching power supply's drive circuit through the one-way conduction circuit, the one-way conduction circuit includes two switch tubes and its drive circuit, the body diode reverse series connection of two switch tubes; when the output voltage of the one-way conduction circuit is smaller than the input voltage of the one-way conduction circuit or the lower tube of the switching power supply is conducted, driving voltages are respectively given to the control ends of the two switching tubes so as to reduce the conduction voltage drop of the two switching tubes; the switching power supply comprises an upper tube and a lower tube, the upper tube is connected with the lower tube, and the power supply voltage is supplied to the driving circuit of the upper tube through the one-way conduction circuit. The utility model discloses can avoid the influence that body diode parasitic effect brought.
Description
Technical Field
The utility model relates to a power electronics field, in particular to one-way conduction circuit and use its switching power supply.
Background
FIG. 1 illustrates a schematic diagram of a prior art switching power supply, wherein a supply voltage VDD is supplied to a switching power supply driving circuit through two MOS tubes connected in series; however, when the synchronous rectifier M1 is turned off, the voltage at SW is pulled down to be less than zero, so that the voltage at the high potential of the bootstrap capacitor C0 is pulled down, and thus the voltage difference between the input terminal and the positive electrode of the bootstrap capacitor C0 is large, which causes leakage current to flow through the body diode of the main switch M2. Leakage current flowing through the body diode can affect circuit performance due to parasitic effects of the body diode.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an avoid leaking current and flow through body diode's one-way conduction circuit charging method and use its switching power supply for solve the problem that the parasitic effect that the leakage current that prior art exists flows through body diode and brings.
In order to achieve the above object, the present invention provides a unidirectional circuit, which is applied to a switching power supply, wherein a power supply voltage supplies power to a driving circuit of the switching power supply through the unidirectional circuit, the unidirectional circuit comprises two switching tubes and a driving circuit thereof, and body diodes of the two switching tubes are connected in series in a reverse direction; when the output voltage of the one-way conduction circuit is smaller than the input voltage of the one-way conduction circuit or the lower tube of the switching power supply is conducted, driving voltages are respectively given to the control ends of the two switching tubes so as to reduce the conduction voltage drop of the two switching tubes;
the switching power supply comprises an upper tube and a lower tube, the upper tube is connected with the lower tube, and the power supply voltage is supplied to the driving circuit of the upper tube through the one-way conduction circuit.
Optionally, the two switching tubes are NMOS tubes, and when the output voltage of the unidirectional conduction circuit is greater than the input voltage thereof or the lower tube of the switching power supply is turned off, the gates of the two switching tubes are connected to the input end of the unidirectional conduction circuit; when the output voltage of the unidirectional conduction circuit is smaller than the input voltage of the unidirectional conduction circuit or the lower tube of the switching power supply is conducted, the grid driving voltages of the two switching tubes are higher than the power supply voltage.
Optionally, the two MOS transistors are both PMOS transistors, and when the output voltage of the unidirectional conduction circuit is greater than the input voltage thereof or the lower tube of the switching power supply is turned off, the gates of the two switching transistors are connected to the output end of the unidirectional conduction circuit; when the output voltage of the unidirectional conducting circuit is smaller than the input voltage of the unidirectional conducting circuit or the lower tube of the switching power supply is conducted, the grid driving voltage of the two switching tubes is lower than the voltage of the output end of the unidirectional conducting circuit.
Optionally, one of the two MOS transistors is an NMOS transistor, and the other is a PMOS transistor; when the output voltage of the unidirectional conduction circuit is greater than the input voltage of the unidirectional conduction circuit or the lower tube of the switching power supply is turned off, the grid electrode of the NMOS tube is connected with the source electrode of the PMOS tube, and the grid electrode of the PMOS tube is connected with the drain electrode of the PMOS tube and the source electrode of the NMOS tube; the source electrode of the PMOS tube is connected with the input end of the one-way conducting circuit, and the drain electrode of the NMOS tube is connected with the output end of the one-way conducting circuit.
Optionally, one of the two MOS transistors is an NMOS transistor, and the other is a PMOS transistor; when the output voltage of the unidirectional conduction circuit is greater than the input voltage of the unidirectional conduction circuit or the lower tube of the switching power supply is turned off, the grid electrode of the NMOS tube is connected with the drain electrode of the unidirectional conduction circuit and the source electrode of the PMOS tube, and the grid electrode of the PMOS tube is connected with the source electrode of the NMOS tube; the drain electrode of the PMOS tube is connected with the input end of the unidirectional conduction circuit, and the source electrode of the NMOS tube is connected with the output end of the unidirectional conduction circuit.
Optionally, the drive circuit of the NMOS transistor includes a charge pump circuit, and when the output voltage of the unidirectional conduction circuit is smaller than the input voltage thereof or the lower tube of the switching power supply is turned on, the charge pump circuit drives the NMOS transistor to be turned on.
Optionally, the driving circuit of the NMOS transistor includes a first capacitor, and when the output voltage of the unidirectional conducting circuit is greater than the input voltage thereof or the lower tube of the switching power supply is turned off, the high potential end of the first capacitor receives the supply voltage, and the low potential end of the first capacitor receives the first voltage; when the output voltage of the unidirectional conduction circuit is smaller than the input voltage of the unidirectional conduction circuit or the lower tube of the switching power supply is conducted, the low potential end of the first capacitor receives the power supply voltage, and the high potential end of the first capacitor is connected with the grid electrode of the NMOS tube.
Optionally, the driving circuit of the NMOS transistor includes a first capacitor, when the output voltage of the unidirectional conducting circuit is greater than the input voltage thereof or the lower tube of the switching power supply is turned off, a high potential end of the first capacitor is connected to the common connection end of the two MOS transistors, and a low potential end thereof receives the first voltage; when the output voltage of the unidirectional conduction circuit is smaller than the input voltage of the unidirectional conduction circuit or the lower tube of the switching power supply is conducted, the low potential end of the first capacitor is connected with the common connecting end of the two MOS tubes, and the high potential end of the first capacitor is connected with the grid electrode of the NMOS tube.
Optionally, the driving circuit of the PMOS transistor includes a first driving transistor and a second driving transistor, a first end of the first driving transistor is connected to the output end of the unidirectional turn-on circuit, a second end of the first driving transistor is connected to a first end of the second driving transistor, a common connection end of the first driving transistor is connected to the gate of the PMOS transistor, a second end of the second driving transistor receives a second voltage, and the second voltage is smaller than the output voltage of the unidirectional turn-on circuit; when the output voltage of the one-way conduction circuit is larger than the input voltage of the one-way conduction circuit or the lower tube of the switching power supply is turned off, controlling the first driving tube to be conducted and the second driving tube to be turned off; and when the output voltage of the one-way conduction circuit is smaller than the input voltage of the one-way conduction circuit or the lower tube of the switching power supply is conducted, controlling the first driving tube to be switched off and the second driving tube to be conducted.
Optionally, the driving circuit of the PMOS transistor includes a first driving transistor and a second driving transistor, a first end of the first driving transistor is connected to a common connection end of the two MOS transistors, a second end of the first driving transistor is connected to a first end of the second driving transistor, a common connection end of the first driving transistor is connected to a gate of the PMOS transistor, a second end of the second driving transistor receives a second voltage, and the second voltage is smaller than a voltage of the common connection end of the two MOS transistors; when the output voltage of the one-way conduction circuit is larger than the input voltage of the one-way conduction circuit or the lower tube of the switching power supply is turned off, controlling the first driving tube to be conducted and the second driving tube to be turned off; and when the output voltage of the one-way conduction circuit is smaller than the input voltage of the one-way conduction circuit or the lower tube of the switching power supply is conducted, controlling the first driving tube to be switched off and the second driving tube to be conducted.
The utility model also provides a switching power supply, including above arbitrary one the one-way conduction circuit.
Compared with the prior art, the utility model has the advantages of it is following: the utility model provides a power supply voltage for the drive circuit of the switch power supply through the one-way conduction circuit, the one-way conduction circuit comprises two switch tubes and the drive circuit thereof, and the body diodes of the two switch tubes are reversely connected in series; when the output voltage of the one-way conduction circuit is smaller than the input voltage of the one-way conduction circuit or the lower tube of the switching power supply is conducted, driving voltages are respectively given to the control ends of the two switching tubes so as to reduce the conduction voltage drop of the two switching tubes. The utility model discloses can avoid the influence that body diode parasitic effect brought.
Drawings
FIG. 1 is a schematic diagram of a prior art switching power supply;
FIG. 2 is a schematic diagram of a real-time embodiment of the unidirectional conducting circuit of the present invention;
FIG. 3 is a schematic diagram of a real-time embodiment II of the unidirectional conducting circuit of the present invention;
FIG. 4 is a diagram of three schematic diagrams of a real-time embodiment of the unidirectional conducting circuit of the present invention;
FIG. 5 is a schematic diagram of a real-time embodiment of a unidirectional conducting circuit of the present invention;
FIG. 6 is a schematic diagram of a driving circuit of an NMOS transistor in the unidirectional conducting circuit of the present invention;
FIG. 7 is a schematic diagram of a driving circuit of a PMOS transistor in the unidirectional conducting circuit of the present invention;
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to only these embodiments. The present invention covers any alternatives, modifications, equivalents, and alternatives falling within the spirit and scope of the present invention.
In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.
The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. It should be noted that the drawings are simplified and in non-precise proportion, so as to facilitate and clearly assist in explaining the embodiments of the present invention.
The utility model discloses supply voltage charges through the one-way conduction circuit to bootstrap electric capacity in order to the drive circuit power supply to switching power supply's last pipe.
As shown in fig. 2, the utility model discloses a schematic diagram of one-way conduction circuit embodiment, including two NMOS pipes, the body diode reverse series connection of two NMOS pipes, the grid of two NMOS pipes links to each other, and one of them NMOS manages the drain electrode and is one-way conduction circuit input, and another NMOS manages the drain electrode and is one-way conduction circuit output. When the output voltage of the unidirectional conduction circuit is larger than the input voltage of the unidirectional conduction circuit or the lower tube of the switching power supply is turned off, the grids of the two NMOS tubes receive the power supply voltage.
As shown in fig. 3, the second schematic diagram of the embodiment of the unidirectional conducting circuit of the present invention is illustrated, including two PMOS transistors, the body diode reverse series connection of the two PMOS transistors, the gates of the two PMOS transistors are connected, one of the drains of the PMOS transistors is the unidirectional conducting circuit input end, and the other drain of the PMOS transistor is the unidirectional conducting circuit output end. When the output voltage of the unidirectional conduction circuit is larger than the input voltage of the unidirectional conduction circuit or the lower tube of the switching power supply is turned off, the grids of the two PMOS tubes are connected with the output end of the unidirectional conduction circuit.
As shown in fig. 4, the utility model discloses three principle pictures of unidirectional conducting circuit embodiment, including a NMOS pipe and a PMOS pipe, the body diode reverse series connection of two MOS pipes, the source electrode of PMOS pipe is the input of unidirectional conducting circuit, and the drain electrode of NMOS pipe is the output of unidirectional conducting circuit, and the source electrode of NMOS pipe is connected to the drain electrode of PMOS pipe. When the output voltage of the unidirectional conduction circuit is larger than the input voltage of the unidirectional conduction circuit or the lower tube of the switching power supply is turned off, the grid electrode of the PMOS tube is connected with the source electrode of the NMOS tube, and the grid electrode of the NMOS tube is connected with the source electrode of the PMOS tube.
As shown in fig. 5, the four schematic diagrams of the embodiment of the unidirectional conducting circuit of the present invention are illustrated, including an NMOS tube and a PMOS tube, the reverse series connection of the body diode of the two MOS tubes, the drain electrode of the PMOS tube is the input end of the unidirectional conducting circuit, the source electrode of the NMOS tube is the output end of the unidirectional conducting circuit, and the drain electrode of the NMOS tube is connected to the source electrode of the PMOS tube. When the output voltage of the unidirectional conduction circuit is larger than the input voltage of the unidirectional conduction circuit or the lower tube of the switching power supply is turned off, the grid electrode of the PMOS tube is connected with the source electrode of the NMOS tube, and the grid electrode of the NMOS tube is connected with the source electrode of the PMOS tube.
Fig. 6 illustrates the utility model discloses drive circuit schematic diagram of NMOS pipe among the one-way conduction circuit, drive circuit is the charge pump circuit, including first electric capacity C0 and phase inverter, the signal PWM1 of sign one-way conduction circuit input/output relation or switching power supply low tube break-make is received to the phase inverter input, and the first end of first electric capacity C0 is connected to the output, and the grid of NMOS pipe among the one-way conduction circuit is connected to first electric capacity C0 second end. If the connection relationship of the two MOS transistors is the case illustrated in fig. 2 or fig. 4, when the output voltage of the unidirectional conducting circuit is greater than the input voltage thereof or the lower tube of the switching power supply is turned off, the inverter outputs a voltage VDD-V1, at this time, the gate driving voltage is VDD, and the voltage on the first capacitor C0 is V1; when the output voltage of the unidirectional conducting circuit is smaller than the input voltage of the unidirectional conducting circuit or the lower tube of the switching power supply is conducted, the output voltage VDD of the inverter is equal to the voltage VDD + V1 of the second end (the gate driving voltage of the NMOS tube) of the first capacitor C0. If the connection relationship of the two MOS transistors is the case illustrated in fig. 3, when the output voltage of the unidirectional conducting circuit is greater than the input voltage thereof or the lower tube of the switching power supply is turned off, the inverter outputs a voltage VC-V1, at this time, the gate driving voltage is VC, and the voltage across the first capacitor C0 is V1; when the output voltage of the unidirectional conducting circuit is smaller than the input voltage of the unidirectional conducting circuit or the lower tube of the switching power supply is conducted, the output voltage VC of the inverter is obtained, and the voltage of the second end (the grid driving voltage of the NMOS tube) of the first capacitor C0 is VC + V1; and the voltage VC is the voltage of the common connecting end of the two MOS tubes.
Fig. 6 illustrates the driving circuit schematic diagram of the PMOS transistor in the unidirectional conducting circuit of the present invention, including the first driving tube M3 and the second driving tube M4, the control ends of the driving tube M3 and the driving tube M4 receive the signal PWM2 representing the unidirectional conducting circuit input/output relationship or the on-off of the switching power supply lower tube. The first end of the first driving tube M3 is connected with the second end of the second driving tube M4, and the second end of the first driving tube M3 is connected with a second voltage; the common connection end of the second end of the first driving tube M3 and the first end of the second driving tube M4 is connected with the grid electrode of the PMOS tube. If the connection relationship of the two MOS transistors is the case illustrated in fig. 3 or fig. 5, the first end of the first driving transistor M3 is connected to the output end of the unidirectional conducting circuit, and the second voltage is smaller than the output voltage of the unidirectional conducting circuit; if the connection relationship of the two MOS transistors is the case illustrated in fig. 4, the first end of the first driving transistor M3 is connected to the common connection end of the two MOS transistors, and the second voltage is less than the voltage at the common connection end of the two MOS transistors. When the output voltage of the unidirectional conduction circuit is larger than the input voltage of the unidirectional conduction circuit or the lower tube of the switching power supply is turned off, the driving tube M3 is conducted, the driving tube M4 is turned off, and the PMOS tube is driven to be turned off. When the output voltage of the unidirectional conduction circuit is smaller than the input voltage of the unidirectional conduction circuit or the lower tube of the switching power supply is conducted, the driving tube M3 is turned off, the driving tube M4 is conducted, and the PMOS tube is driven to be conducted.
Persons of ordinary skill in the art will recognize that substitutions and integrations between embodiments may be made without reference to any explicitly recited embodiment.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (11)
1. The utility model provides a unidirectional flux circuit, is applied to switching power supply, and supply voltage passes through unidirectional flux circuit supplies power for switching power supply's drive circuit, its characterized in that: the unidirectional conduction circuit comprises two switching tubes and a driving circuit thereof, and body diodes of the two switching tubes are reversely connected in series; when the output voltage of the one-way conduction circuit is smaller than the input voltage of the one-way conduction circuit or the lower tube of the switching power supply is conducted, driving voltages are respectively given to the control ends of the two switching tubes so as to reduce the conduction voltage drop of the two switching tubes;
the switching power supply comprises an upper tube and a lower tube, the upper tube is connected with the lower tube, and the power supply voltage is supplied to the driving circuit of the upper tube through the one-way conduction circuit.
2. A unidirectional conduction circuit as claimed in claim 1, wherein: the two switch tubes are NMOS tubes, and when the output voltage of the unidirectional conduction circuit is greater than the input voltage of the unidirectional conduction circuit or the lower tube of the switching power supply is turned off, the grids of the two switch tubes are connected with the input end of the unidirectional conduction circuit; when the output voltage of the unidirectional conduction circuit is smaller than the input voltage of the unidirectional conduction circuit or the lower tube of the switching power supply is conducted, the grid driving voltages of the two switching tubes are higher than the power supply voltage.
3. A unidirectional conduction circuit as claimed in claim 1, wherein: the two switching tubes are PMOS tubes, and when the output voltage of the unidirectional conduction circuit is greater than the input voltage of the unidirectional conduction circuit or the lower tube of the switching power supply is turned off, the grids of the two switching tubes are connected with the output end of the unidirectional conduction circuit; when the output voltage of the unidirectional conducting circuit is smaller than the input voltage of the unidirectional conducting circuit or the lower tube of the switching power supply is conducted, the grid driving voltage of the two switching tubes is lower than the voltage of the output end of the unidirectional conducting circuit.
4. A unidirectional conduction circuit as claimed in claim 1, wherein: one of the two switch tubes is an NMOS tube, and the other switch tube is a PMOS tube; when the output voltage of the unidirectional conduction circuit is greater than the input voltage of the unidirectional conduction circuit or the lower tube of the switching power supply is turned off, the grid electrode of the NMOS tube is connected with the source electrode of the PMOS tube, and the grid electrode of the PMOS tube is connected with the drain electrode of the PMOS tube and the source electrode of the NMOS tube; the source electrode of the PMOS tube is connected with the input end of the one-way conducting circuit, and the drain electrode of the NMOS tube is connected with the output end of the one-way conducting circuit.
5. A unidirectional conduction circuit as claimed in claim 1, wherein: one of the two switch tubes is an NMOS tube, and the other switch tube is a PMOS tube; when the output voltage of the unidirectional conduction circuit is greater than the input voltage of the unidirectional conduction circuit or the lower tube of the switching power supply is turned off, the grid electrode of the NMOS tube is connected with the drain electrode of the unidirectional conduction circuit and the source electrode of the PMOS tube, and the grid electrode of the PMOS tube is connected with the source electrode of the NMOS tube; the drain electrode of the PMOS tube is connected with the input end of the unidirectional conduction circuit, and the source electrode of the NMOS tube is connected with the output end of the unidirectional conduction circuit.
6. A unidirectional conduction circuit as claimed in claim 2, 4 or 5, wherein: the drive circuits of the two MOS tubes comprise charge pump circuits, and when the output voltage of the one-way conduction circuit is smaller than the input voltage of the one-way conduction circuit or the lower tube of the switching power supply is conducted, the charge pump circuits drive the NMOS tubes to be conducted.
7. A unidirectional conduction circuit as claimed in claim 2 or 4, wherein: the drive circuit of the NMOS tube comprises a first capacitor, when the output voltage of the unidirectional conduction circuit is greater than the input voltage of the unidirectional conduction circuit or the lower tube of the switching power supply is turned off, the high potential end of the first capacitor receives the supply voltage, and the low potential end of the first capacitor receives the first voltage; when the output voltage of the unidirectional conduction circuit is smaller than the input voltage of the unidirectional conduction circuit or the lower tube of the switching power supply is conducted, the low potential end of the first capacitor receives the power supply voltage, and the high potential end of the first capacitor is connected with the grid electrode of the NMOS tube.
8. A unidirectional conduction circuit as claimed in claim 5, wherein: the drive circuit of the NMOS tube comprises a first capacitor, when the output voltage of the unidirectional conduction circuit is greater than the input voltage of the unidirectional conduction circuit or the lower tube of the switching power supply is turned off, the high potential end of the first capacitor is connected with the common connecting end of the two MOS tubes, and the low potential end of the first capacitor receives a first voltage; when the output voltage of the unidirectional conduction circuit is smaller than the input voltage of the unidirectional conduction circuit or the lower tube of the switching power supply is conducted, the low potential end of the first capacitor is connected with the common connecting end of the two MOS tubes, and the high potential end of the first capacitor is connected with the grid electrode of the NMOS tube.
9. A unidirectional conduction circuit as claimed in claim 3 or 5, wherein: the drive circuit of the PMOS tube comprises a first drive tube and a second drive tube, wherein the first end of the first drive tube is connected with the output end of the one-way conduction circuit, the second end of the first drive tube is connected with the first end of the second drive tube, the common connection end of the first drive tube is connected with the grid electrode of the PMOS tube, the second end of the second drive tube receives a second voltage, and the second voltage is less than the output voltage of the one-way conduction circuit; when the output voltage of the one-way conduction circuit is larger than the input voltage of the one-way conduction circuit or the lower tube of the switching power supply is turned off, controlling the first driving tube to be conducted and the second driving tube to be turned off; and when the output voltage of the one-way conduction circuit is smaller than the input voltage of the one-way conduction circuit or the lower tube of the switching power supply is conducted, controlling the first driving tube to be switched off and the second driving tube to be conducted.
10. A unidirectional conduction circuit as claimed in claim 4, wherein: the drive circuit of the PMOS tube comprises a first drive tube and a second drive tube, wherein the first end of the first drive tube is connected with the common connecting end of the two MOS tubes, the second end of the first drive tube is connected with the first end of the second drive tube, the common connecting end of the first drive tube is connected with the grid electrode of the PMOS tube, the second end of the second drive tube receives a second voltage, and the second voltage is less than the voltage of the common connecting end of the two MOS tubes; when the output voltage of the one-way conduction circuit is larger than the input voltage of the one-way conduction circuit or the lower tube of the switching power supply is turned off, controlling the first driving tube to be conducted and the second driving tube to be turned off; and when the output voltage of the one-way conduction circuit is smaller than the input voltage of the one-way conduction circuit or the lower tube of the switching power supply is conducted, controlling the first driving tube to be switched off and the second driving tube to be conducted.
11. A switching power supply, characterized by: comprising a unidirectional conducting circuit according to any of claims 1-10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021055531.8U CN212323982U (en) | 2020-06-10 | 2020-06-10 | One-way conduction circuit and switching power supply using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021055531.8U CN212323982U (en) | 2020-06-10 | 2020-06-10 | One-way conduction circuit and switching power supply using same |
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| Publication Number | Publication Date |
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| CN212323982U true CN212323982U (en) | 2021-01-08 |
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| CN202021055531.8U Active CN212323982U (en) | 2020-06-10 | 2020-06-10 | One-way conduction circuit and switching power supply using same |
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| CN (1) | CN212323982U (en) |
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- 2020-06-10 CN CN202021055531.8U patent/CN212323982U/en active Active
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Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Patentee after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Patentee before: JOULWATT TECHNOLOGY (HANGZHOU) Co.,Ltd. |
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