CN111600463A - 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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- CN111600463A CN111600463A CN202010522400.4A CN202010522400A CN111600463A CN 111600463 A CN111600463 A CN 111600463A CN 202010522400 A CN202010522400 A CN 202010522400A CN 111600463 A CN111600463 A CN 111600463A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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Abstract
The invention provides a one-way conduction circuit, which is applied to a switching power supply, wherein power supply voltage supplies power to a driving circuit of the switching power supply through the one-way conduction circuit, the one-way 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. The invention can avoid the influence caused by the parasitic effect of the body diode.
Description
Technical Field
The invention relates to the field of power electronics, in particular to a unidirectional conducting circuit and a switching power supply using the unidirectional conducting circuit.
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.
Disclosure of Invention
The invention aims to provide a charging method of a one-way conduction circuit for preventing leakage current from flowing through a body diode and a switching power supply applying the charging method, which are used for solving the problem of parasitic effect caused by the fact that the leakage current flows through the body diode in the prior art.
In order to achieve the purpose, the invention provides a one-way conduction circuit which is applied to a switching power supply, wherein power supply voltage supplies power to a driving circuit of the switching power supply through the one-way conduction circuit, the one-way 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.
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 invention also provides a switching power supply which comprises the unidirectional conducting circuit.
Compared with the prior art, the invention has the following advantages: the power supply voltage supplies power to a driving circuit of a switching power supply through the one-way conduction circuit, the one-way 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 invention can avoid the influence caused by the parasitic effect of the body diode.
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 a unidirectional conducting circuit according to the present invention;
FIG. 3 is a schematic diagram of a second embodiment of a unidirectional conducting circuit of the present invention;
FIG. 4 is a diagram of three schematic diagrams of a real-time embodiment of a unidirectional conducting circuit according to 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
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 invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the 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 in simplified form and are not to precise scale for the purpose of facilitating and clearly explaining the embodiments of the present invention.
The power supply voltage of the invention charges the bootstrap capacitor through the unidirectional conducting circuit to supply power to the driving circuit of the upper tube of the switching power supply.
As shown in fig. 2, a schematic diagram of an embodiment of the unidirectional conducting circuit of the present invention is illustrated, which includes two NMOS transistors, the body diodes of the two NMOS transistors are connected in series in reverse, the gates of the two NMOS transistors are connected, the drain of one NMOS transistor is the input terminal of the unidirectional conducting circuit, and the drain of the other NMOS transistor is the output terminal of the unidirectional conducting circuit. 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, a schematic diagram of a second embodiment of the unidirectional conducting circuit of the present invention is shown, which includes two PMOS transistors, wherein the body diodes of the two PMOS transistors are connected in series in reverse, the gates of the two PMOS transistors are connected, the drain of one PMOS transistor is the input terminal of the unidirectional conducting circuit, and the drain of the other PMOS transistor is the output terminal of the unidirectional conducting circuit. 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, a three-principle diagram of an embodiment of the unidirectional conducting circuit of the present invention is illustrated, which includes an NMOS transistor and a PMOS transistor, wherein the body diodes of the two MOS transistors are connected in series in reverse, the source of the PMOS transistor is the input terminal of the unidirectional conducting circuit, the drain of the NMOS transistor is the output terminal of the unidirectional conducting circuit, and the drain of the PMOS transistor is connected to the source of the NMOS transistor. 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, a diagram illustrating a fourth principle of the unidirectional conducting circuit according to the embodiment of the present invention includes an NMOS transistor and a PMOS transistor, wherein the body diodes of the two MOS transistors are connected in series in reverse, the drain of the PMOS transistor is the input terminal of the unidirectional conducting circuit, the source of the NMOS transistor is the output terminal of the unidirectional conducting circuit, and the source of the PMOS transistor is connected to the drain of the NMOS transistor. 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 a schematic diagram of a driving circuit of an NMOS transistor in the unidirectional conducting circuit according to the present invention, where the driving circuit is a charge pump circuit, and includes a first capacitor C0 and an inverter, an input end of the inverter receives a signal PWM1 representing an input-output relationship of the unidirectional conducting circuit or on-off of a lower tube of a switching power supply, an output end of the inverter is connected to a first end of a first capacitor C0, and a second end of the first capacitor C0 is connected to a gate of the NMOS transistor in the unidirectional conducting circuit. 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 a schematic diagram of a driving circuit of a PMOS transistor in the unidirectional conducting circuit of the present invention, which includes a first driving transistor M3 and a second driving transistor M4, and control terminals of the driving transistor M3 and the driving transistor M4 receive a signal PWM2 representing the input/output relationship of the unidirectional conducting circuit or the on/off of a lower tube of the switching power supply. 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 MOS 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 MOS tubes is an NMOS tube, and the other MOS 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 NMOS tubes is an NMOS tube, and the other one 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 |
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| CN202010522400.4A CN111600463A (en) | 2020-06-10 | 2020-06-10 | One-way conduction circuit and switching power supply using same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010522400.4A CN111600463A (en) | 2020-06-10 | 2020-06-10 | One-way conduction circuit and switching power supply using same |
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| CN111600463A true CN111600463A (en) | 2020-08-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113054974A (en) * | 2021-03-30 | 2021-06-29 | 展讯通信（上海）有限公司 | Power supply test switch circuit, driving method thereof and power supply test switch system |
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2020
- 2020-06-10 CN CN202010522400.4A patent/CN111600463A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113054974A (en) * | 2021-03-30 | 2021-06-29 | 展讯通信（上海）有限公司 | Power supply test switch circuit, driving method thereof and power supply test switch system |
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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 Applicant 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 Applicant before: JOULWATT TECHNOLOGY Inc.,Ltd. |