CN110061621A - A kind of switching power source control circuit and method and Switching Power Supply - Google Patents
A kind of switching power source control circuit and method and Switching Power Supply Download PDFInfo
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- CN110061621A CN110061621A CN201910305820.4A CN201910305820A CN110061621A CN 110061621 A CN110061621 A CN 110061621A CN 201910305820 A CN201910305820 A CN 201910305820A CN 110061621 A CN110061621 A CN 110061621A
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- switch pipe
- upper switch
- capacitor
- switching power
- control circuit
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims abstract description 78
- 230000005611 electricity Effects 0.000 claims description 6
- 239000004065 semiconductor Substances 0.000 claims description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
Classifications
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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
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of switching power source control circuits and method and Switching Power Supply, switching power source control circuit includes first switch and first capacitor, the grid of one end connection power stage circuit upper switch pipe of first switch, one end of the other end connection first capacitor of first switch, the common end of the other end connection power stage circuit upper switch pipe and down tube of first capacitor, during the shutdown of upper switch pipe, disconnect first switch, it charges to first capacitor, so that the voltage of first capacitor reaches first voltage, when opening upper switch pipe, it is closed first switch, the first capacitor charges to the gate capacitance of upper switch pipe, upper switch pipe reaches open state, it is charged using gate capacitance of the charge pump to first capacitor and upper switch pipe, upper switch pipe is in the open state of low conduction loss.The present invention completes the fast conducting of upper switch pipe, and when switching power source control circuit integrates in the chip, no setting is required, and low switching losses and low conduction loss are can be realized in external terminal.
Description
Technical field
The present invention relates to power electronics fields, more specifically, being related to a kind of switching power source control circuit and method
And Switching Power Supply.
Background technique
In practical application, Switching Power Supply upper switch pipe generally uses more universal in N-type MOS, especially high-voltage applications.When
When Switching Power Supply is integrated in the chip, in order to realize the control of upper switch pipe, then chip needs an independent pin BST, together
When chip exterior need between pin BST and pin SW connect a capacitor, by the capacitor be chip interior upper switch pipe
Control circuit power supply, as shown in Figure 1, by taking buck circuit as an example, the control circuit collection of the buck circuit and upper switch pipe Q0
At in the chip, chip has an independent pin BST, while chip exterior connects one between pin BST and pin SW
Capacitor C1 first charges to capacitor C1, and then capacitor C1 is powered control circuit, to complete the control to upper switch pipe
System.
But one independent pin BST of chip outside need setting is just able to achieve low in the control method of the above-mentioned prior art
Switching loss and low conduction loss, the pin function is single, reduces the selection freedom degree of chip package form；In addition, chip
A capacitor is connected between external terminal BST and pin SW, the capacitor is in chip exterior, and capacity is generally large, increases
Cost.
Summary of the invention
In view of this, the present invention provides a kind of Switching Power Supply it is integrated in the chip when no setting is required external terminal BST
The switching power source control circuit and method and Switching Power Supply that low switching losses and low conduction loss can be achieved, for solving existing skill
Switching power source control circuit existing for art it is integrated in the chip when chip exterior need to be arranged an independent pin BST just can be real
The technical issues of existing low switching losses and low conduction loss.
The present invention provides a kind of switching power source control circuits, it is characterised in that: including first switch and first capacitor, institute
The grid of one end connection power stage circuit upper switch pipe of first switch is stated, the other end of the first switch connects first capacitor
One end, the first capacitor the other end connection power stage circuit upper switch pipe and down tube common end, upper switch pipe close
During disconnected, first switch is disconnected, is charged to first capacitor, so that the voltage of first capacitor reaches first voltage, opens upper switch
Guan Shi is closed first switch, and the first capacitor charges to the gate capacitance of upper switch pipe, and upper switch pipe reaches open state, benefit
It is charged with gate capacitance of the charge pump to first capacitor and upper switch pipe or is charged using gate capacitance of the charge pump to upper switch pipe, on
Switching tube is in the open state of low conduction loss.
Optionally, it during the shutdown of upper switch pipe, is charged using input voltage or charge pump to first capacitor.
Optionally, when opening upper switch pipe, before being closed first switch, using input voltage to the grid electricity of upper switch pipe
Capacity charge, so that upper switch pipe reaches weak open state.
Optionally, the power stage circuit is buck circuit.
Optionally, during the shutdown of upper switch pipe, the gate source voltage of the upper switch pipe lower than first threshold and is greater than zero.
Optionally, the switching power source control circuit is integrated in the chip.
The present invention also provides a kind of Switching Power Supply control method, the switching power source control circuit include first switch and
First capacitor, the grid of one end connection power stage circuit upper switch pipe of the first switch, the other end of the first switch
One end of first capacitor is connected, the other end of the first capacitor connects the common end of power stage circuit upper switch pipe and down tube,
Characterized by comprising the following steps:
During the shutdown of upper switch pipe, first switch is disconnected, is charged to first capacitor, so that the voltage of first capacitor reaches
First voltage；
When opening upper switch pipe, it is closed first switch, the first capacitor charges to the gate capacitance of upper switch pipe, upper switch
Pipe reaches open state；
It is charged using gate capacitance of the charge pump to first capacitor and upper switch pipe or utilizes charge pump to the grid of upper switch pipe
Capacitor charging, upper switch pipe are in the open state of low conduction loss.
Optionally, it during the shutdown of upper switch pipe, is charged using input voltage or charge pump to first capacitor.
Optionally, when opening upper switch pipe, before being closed first switch, using input voltage to the grid electricity of upper switch pipe
Capacity charge, so that upper switch pipe reaches weak open state.
Optionally, during the shutdown of upper switch pipe, the gate source voltage of the upper switch pipe lower than first threshold and is greater than zero.
The invention also provides a kind of Switching Power Supplies, including above-described switching power source control circuit and power stage electricity
Road, the upper switch pipe of the power stage circuit are N-type metal-oxide-semiconductor.
Using the present invention, compared with prior art, have the advantage that the present invention provides a kind of Switching Power Supply control electricity
Road and method charge to first capacitor during the shutdown of upper switch pipe, when opening upper switch pipe, are closed first switch first,
So that first capacitor and the gate capacitance of upper switch pipe are shorted, the first capacitor charges to the gate capacitance of upper switch pipe, upper switch
Tube grid voltage increases at once, and upper switch pipe is rapidly reached open state, then using charge pump to first capacitor and upper switch
The gate capacitance of pipe is charged or is charged using gate capacitance of the charge pump to upper switch pipe so that upper switch tube grid voltage be maintained at compared with
High level, upper switch pipe are in the open state of low conduction loss.The present invention can complete the fast conducting of upper switch pipe, and work as
When switching power source control circuit is integrated in the chip, no setting is required, and low switching losses and low conducting are can be realized in external terminal BST
Loss.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of prior art switching power source control circuit；
Fig. 2 is the structural schematic diagram of the embodiment of switching power source control circuit of the present invention.
Specific embodiment
The preferred embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention is not restricted to these
Embodiment.The present invention covers any substitution made in the spirit and scope of the present invention, modification, equivalent method and scheme.
In order to make the public have thorough understanding to the present invention, it is described in detail in the following preferred embodiment of the present invention specific
Details, and the present invention can also be understood completely in description without these details for a person skilled in the art.
The present invention is more specifically described by way of example referring to attached drawing in the following passage.It should be noted that attached drawing is adopted
With more simplified form and using non-accurate ratio, only to facilitate, lucidly aid in illustrating the embodiment of the present invention
Purpose.
Switching power source control circuit of the present invention, including first switch and first capacitor, the one of the first switch
The grid of end connection power stage circuit upper switch pipe, one end of the other end connection first capacitor of the first switch, described the
The common end of the other end connection power stage circuit upper switch pipe and down tube of one capacitor disconnects the during the shutdown of upper switch pipe
One switch, charges to first capacitor, so that the voltage of first capacitor reaches first voltage, when opening upper switch pipe, closure first
Switch, the first capacitor charge to the gate capacitance of upper switch pipe, and upper switch pipe reaches open state, using charge pump to first
The charging of the gate capacitance of capacitor and upper switch pipe is charged using gate capacitance of the charge pump to upper switch pipe, and upper switch pipe is in low and leads
The open state of logical loss.The upper switch pipe is the switching tube that one end connects input voltage hot end, and the down tube refers to
The switching tube or diode of input voltage cold end are connected for one end.
In the Switching Power Supply upper switch pipe down periods, first capacitor is pre-charged to using charge pump or input voltage higher
Level；When opening upper switch pipe, it is closed first switch, the gate capacitance of first capacitor and upper switch pipe is shorted, due to electric charge transfer,
Upper switch tube grid voltage will increase at once, so that upper switch pipe is rapidly reached preferable open state；Then pass through charge pump
It further charges to the gate capacitance of first capacitor and upper switch pipe or is only charged to the gate capacitance of upper switch pipe using charge pump, made
It obtains upper switch tube grid voltage to continue to increase or be maintained at higher level, guarantees that upper switch pipe is in good open state, tie up
Hold lesser conduction impedance.
During the shutdown of upper switch pipe, the gate source voltage of the upper switch pipe is being opened lower than first threshold and greater than zero
When upper switch pipe, the voltage of first threshold is had existed greater than zero and be lower than in the gate capacitance of upper switch pipe, can make upper switch
The opening speed of pipe is faster.
It is N-type metal-oxide-semiconductor that above-mentioned switching power source control circuit, which is applied to upper switch pipe in power stage circuit,.
In addition, when the power stage circuit is buck circuit, when opening upper switch pipe, before being closed first switch,
It charges first with gate capacitance of the input voltage to upper switch pipe, so that upper switch pipe reaches weak open state, can also make
The opening speed of switching tube is faster.
The embodiment of switching power source control circuit has very much, and Fig. 1 gives a kind of embodiment.As shown in Figure 1, the power
Grade circuit is buck circuit, including switching tube Q0, down tube Q1, and the drain electrode of inductance L0, the switching tube Q0 connect input voltage
Hot end, the grid of the switching tube Q0 connect the grid of the drive control circuit, the source electrode connection of the switching tube Q0
The cathode of the down tube, the anode of the down tube connect the cold end of the input voltage, one end connection of the inductance L0
The common end of the switching tube Q0 and down tube Q1, the other end of the inductance L0 connect one end of the resistance R0, the resistance
The other end of R0 connects the cold end of the input voltage, and the capacitor C0 and resistance R0 are in parallel.
The switching power source control circuit include first switch S1, second switch S2, third switch S3, the 4th switch S4,
One end of 5th switching tube S5, charge pump and first capacitor C1, the first switch S1 connect power stage circuit upper switch pipe Q0
Grid, the first switch S1 the other end connection first capacitor C1 one end, the first capacitor C1 the other end connection
The common end of power stage circuit upper switch pipe Q0 and down tube Q1, one end of the second switch S2 is through diode D1 connection upper switch
The grid of pipe Q0, the other end of the second switch S2 receive input voltage vin, and one end of third switch S3 connects first capacitor
The common end of C1 and first switch S1, the other end of third switch receive input voltage vin, and one end of the 4th switch S4 connects the
The common end of one capacitor C1 and first switch S1, the other end of the 4th switching tube connect charge pump, and one end of the 5th switch S5 connects
The grid of the upper switch pipe Q0 is connect, the other end connects charge pump, and the input of the charge pump is input voltage.
The specific control process of above-described embodiment is as follows:
1: the upper switch pipe Q0 down periods are closed the 4th switch S4 using charge pump and are precharged to first to first capacitor C1
Voltage, first voltage are higher level, and when input voltage VIN is lower or smaller (DCM) the situation charge pump of VIN and VOUT pressure difference can
Using multistage, to reduce the demand to first capacitor C1 capacitance；
When needing to open upper switch pipe Q0, the 4th switch S4 is disconnected, is closed second switch S2, input voltage VIN is to upper
Switching tube gate capacitance Cg charging, so that upper switch pipe Q0 is weak open state, SW is begun to ramp up；
It is closed first switch S1, first capacitor C1 charges to upper switch pipe gate capacitance Cg, and the charge of first capacitor C1 will turn
Upper switch pipe gate capacitance Cg is moved on to, so that upper switch tube grid voltage increases at once, SW can rise very rapidly up to VIN level, to subtract
Small Switch Losses；
It is closed the 4th switch S4, charge pump continues that (or the 5th switch S5 of closure, charge pump continue to Cg to C1 and Cg charging
Charging) so that upper switch pipe grid voltage is further up or is maintained at higher level, to guarantee that upper switch pipe is in low conducting resistance
Anti- state can reduce conduction loss.
2: (CCM) higher to input voltage VIN or input voltage VIN are higher and output voltage VO UT lower (DCM) is answered
With situation, the upper switch pipe down periods can close charge pump to save power consumption, be closed third switch S3, use input voltage vin
First capacitor C1 is precharged to input voltage VIN level；
When needing to open upper switch pipe Q0, third switch S3 is disconnected, is closed second switch S2, input voltage VIN is to upper
Switching tube gate capacitance Cg charging, so that upper switch pipe Q0 is weak open state, SW is begun to ramp up；
It is closed first switch S1, first capacitor C1 charges to upper switch pipe gate capacitance Cg, and the charge of first capacitor C1 will turn
Upper switch pipe gate capacitance Cg is moved on to, so that upper switch tube grid voltage increases at once, SW can rise very rapidly up to VIN level, to subtract
Small Switch Losses；
It is closed the 4th switch S4, charge pump continues that (or the 5th switch S5 of closure, charge pump continue to Cg to C1 and Cg charging
Charging) so that upper switch pipe grid voltage is further up or is maintained at higher level, to guarantee that upper switch pipe is in low conducting resistance
Anti- state can reduce conduction loss.
Therefore the above embodiments are that preferably scheme, Selection utilization input voltage or charge pump carry out first capacitor C1
Charging, the requirement for all considering energy consumption and quickly opening.It in other examples, can be just with charge pump to first
Capacitor C1 charges, and in a further embodiment, charges just with input voltage to first capacitor, these are at this
In the protection scope of invention.
In the embodiment having, is charged the step, can be made to upper switch pipe gate capacitance Cg using input voltage
Opening speed is slack-off, but also within the scope of the present invention.It is described during the shutdown of upper switch pipe in the embodiment having
The gate source voltage of upper switch pipe can achieve and fill with input voltage to upper switch pipe gate capacitance Cg lower than first threshold and greater than zero
The identical effect of electricity, also within the scope of the present invention.
In boost circuit, when opening upper switch pipe, the connection for opening input voltage and upper switch tube grid is not needed,
Because inductive current can make SW directly be increased at upper switch tube body diode forward pressure drop higher than input voltage, can not
It is charged by input voltage to upper switch pipe gate capacitance；Therefore in boost circuit, input voltage and upper switch pipe are opened except saving
Outside the step for grid connects, remaining is identical as buck circuit.
Due to not having input voltage to charge this process upper switch pipe gate capacitance, boost circuit upper switch pipe opens speed
Degree can be slower than buck circuit.But this point can be improved in control process.During the shutdown of upper switch pipe, the upper switch pipe
Gate source voltage lower than first threshold and be greater than zero, the first threshold be less than supervisor open when pressure drop Vth, be equivalent at this time
Voltage is prestored originally in upper switch pipe gate capacitance Cg, when needing to open upper switch pipe, using first capacitor C1 to upper switch
Pipe gate capacitance Cg charging can be quicker, so that upper switch pipe is more quickly opened.
When switching power source control circuit it is integrated in the chip when, upper switch pipe can be completed in no setting is required external terminal BST
Quick unlatching.
Although embodiment is separately illustrated and is illustrated above, it is related to the common technology in part, in ordinary skill
Personnel apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and the content recorded is not known, then
It can refer to another embodiment on the books.
Embodiments described above does not constitute the restriction to the technical solution protection scope.It is any in above-mentioned implementation
Made modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution within the spirit and principle of mode
Within enclosing.
Claims (11)
1. a kind of switching power source control circuit, it is characterised in that: including first switch and first capacitor, the one of the first switch
The grid of end connection power stage circuit upper switch pipe, one end of the other end connection first capacitor of the first switch, described the
The common end of the other end connection power stage circuit upper switch pipe and down tube of one capacitor disconnects the during the shutdown of upper switch pipe
One switch, charges to first capacitor, so that the voltage of first capacitor reaches first voltage, when opening upper switch pipe, closure first
Switch, the first capacitor charge to the gate capacitance of upper switch pipe, and upper switch pipe reaches open state, using charge pump to first
The charging of the gate capacitance of capacitor and upper switch pipe is charged using gate capacitance of the charge pump to upper switch pipe, and upper switch pipe is in low and leads
The open state of logical loss.
2. switching power source control circuit according to claim 1, it is characterised in that: during the shutdown of upper switch pipe, utilize
Input voltage or charge pump charge to first capacitor.
3. switching power source control circuit according to claim 1 or 2, it is characterised in that: when opening upper switch pipe, be closed
Before first switch, charged using gate capacitance of the input voltage to upper switch pipe.
4. switching power source control circuit according to claim 3, it is characterised in that: the power stage circuit is buck electricity
Road.
5. switching power source control circuit according to claim 1 or 2, it is characterised in that: during the shutdown of upper switch pipe, institute
The gate source voltage of upper switch pipe is stated lower than first threshold and is greater than zero.
6. switching power source control circuit according to claim 1 or 2, it is characterised in that: the switching power source control circuit
It integrates in the chip.
7. a kind of Switching Power Supply control method, the switching power source control circuit includes first switch and first capacitor, described
The grid of one end connection power stage circuit upper switch pipe of one switch, the one of the other end connection first capacitor of the first switch
End, the first capacitor the other end connection power stage circuit upper switch pipe and down tube common end, which is characterized in that including with
Lower step:
During the shutdown of upper switch pipe, first switch is disconnected, is charged to first capacitor, so that the voltage of first capacitor reaches first
Voltage；
When opening upper switch pipe, it is closed first switch, the first capacitor charges to the gate capacitance of upper switch pipe, upper switch Guan Da
To open state；
It is charged using gate capacitance of the charge pump to first capacitor and upper switch pipe or utilizes charge pump to the gate capacitance of upper switch pipe
Charging, upper switch pipe are in the open state of low conduction loss.
8. Switching Power Supply control method according to claim 7, it is characterised in that: during the shutdown of upper switch pipe, utilize
Input voltage or charge pump charge to first capacitor.
9. Switching Power Supply control method according to claim 7 or 8, it is characterised in that: when opening upper switch pipe, be closed
Before first switch, charged using gate capacitance of the input voltage to upper switch pipe.
10. Switching Power Supply control method according to claim 7 or 8, it is characterised in that: during the shutdown of upper switch pipe,
The gate source voltage of the upper switch pipe is lower than first threshold and is greater than zero.
11. a kind of Switching Power Supply, including switching power source control circuit of any of claims 1 or 2 and power stage circuit, the function
The upper switch pipe of rate grade circuit is N-type metal-oxide-semiconductor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910305820.4A CN110061621A (en) | 2019-04-16 | 2019-04-16 | A kind of switching power source control circuit and method and Switching Power Supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910305820.4A CN110061621A (en) | 2019-04-16 | 2019-04-16 | A kind of switching power source control circuit and method and Switching Power Supply |
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| CN201910305820.4A Pending CN110061621A (en) | 2019-04-16 | 2019-04-16 | A kind of switching power source control circuit and method and Switching Power Supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110545038A (en) * | 2019-08-22 | 2019-12-06 | 杰华特微电子（杭州）有限公司 | Switching power supply control circuit and control method |
| CN111049382A (en) * | 2019-12-31 | 2020-04-21 | 广州金升阳科技有限公司 | BUCK control circuit and control method thereof |
| US20220037984A1 (en) * | 2020-07-28 | 2022-02-03 | Hitachi Power Semiconductor Device, Ltd. | Upper arm drive circuit and control method of upper arm drive circuit |
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| CN110545038A (en) * | 2019-08-22 | 2019-12-06 | 杰华特微电子（杭州）有限公司 | Switching power supply control circuit and control method |
| CN111049382A (en) * | 2019-12-31 | 2020-04-21 | 广州金升阳科技有限公司 | BUCK control circuit and control method thereof |
| US20220037984A1 (en) * | 2020-07-28 | 2022-02-03 | Hitachi Power Semiconductor Device, Ltd. | Upper arm drive circuit and control method of upper arm drive circuit |
| US11735997B2 (en) * | 2020-07-28 | 2023-08-22 | Hitachi Power Semiconductor Device, Ltd. | Upper arm drive circuit having a reverse current prevention circuit disposed between a power supply of a power conversion device and a first capacitor and control method thereof |
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