CN101499719A - Pulse width modulation controller and control method thereof - Google Patents
Pulse width modulation controller and control method thereof Download PDFInfo
- Publication number
- CN101499719A CN101499719A CNA2008100061014A CN200810006101A CN101499719A CN 101499719 A CN101499719 A CN 101499719A CN A2008100061014 A CNA2008100061014 A CN A2008100061014A CN 200810006101 A CN200810006101 A CN 200810006101A CN 101499719 A CN101499719 A CN 101499719A
- Authority
- CN
- China
- Prior art keywords
- voltage
- end points
- pwm controller
- pin
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The invention provides a pulse width modulation controller, comprising a blocking protection device, a power sensing device and a starting device, wherein, the power sensing device compares a first voltage with a starting reference voltage. The starting device compares a second voltage with a power reference voltage. The blocking protection device compares the first voltage with the second voltage so as to generate an UVLO/OC signal.
Description
Technical field
The present invention relates to a kind of circuit design technique, relate in particular to a kind of pulse width modulation (Pulse WidthModulation; PWM) circuit control technology and application thereof.
Background technology
Pwm controller often is applied in changeover voltage adjuster (switching regulator) technology.Fig. 1 controls the circuit diagram of changeover voltage adjuster (switching regulator) 10 for conventional apply pulse width modulation controller.Pwm controller 18 is fed to high-order side transistor 12 and low level side transistor 14 with a plurality of switch controlling signals.Control the connection and the cut-out of high-order side transistor 12 and low level side transistor 14 by adjusting switch controlling signal, can and then control and make input voltage V
InConvert regulated output voltage V to
OutDevice.
The changeover voltage adjuster 10 that Fig. 1 shows comprises and is connected on input voltage V
InAnd high-order side transistor 12 between the earthed voltage GND and low level side transistor 14.Switch controlling signal comprises the UGATE signal, and cut-out or the connection and the LGATE signal of the high-order side transistor 12 of may command are used for controlling the cut-out or the connection of low level side transistor 14.The phase contact 110 of high and low position side transistor is coupled to output stage 112.Output stage 112 comprises low-pass filter circuit and the load circuit R that is made up of electric capacity L and inductance C
L, load circuit R wherein
LIt is output voltage V by changeover voltage adjuster 10
OutDrive.
If Pwm controller 18 is realized, on using, need the multiple function of tool so usually, as excess current protective function, under-voltage locking (Under Voltage Lockout on chip; UVLO), enable/forbid control etc.Overcurrent protection is in order to the flow through electric current of described high-order side transistor 12 or low level side transistor 14 of detection; when electric current is higher than the overcurrent threshold value; stop the running of described pulse width modulation control chip, not damaged by super-high-current with the assembly of protecting described changeover voltage adjuster.Under-voltage locking is as input voltage V
InWhen being lower than threshold value, Pwm controller 18 is temporarily locked, can reduce static electrical source consumption on the one hand, improve output voltage V on the one hand
OutReliability.Enable/disable signal can be used to start/stop the running of described pulse width modulation control chip.Need other function in addition in addition,, be used for detecting the input voltage V of described changeover voltage adjuster as power supply sensing function etc.
InWhen described input voltage is higher than threshold value, make the preparation running of described pulse width modulation control chip, to shorten the required time of described changeover voltage adjuster that starts.
Yet in the practice of general chip design, all require to realize chip with the packaged type of less pin.Therefore, how not influencing under the existing function situation, realizing described multinomial function, do not increasing the pin count of described pulse width modulation control chip again, is the important topic of the described pulse width modulation control chip of design.
Summary of the invention
One embodiment of Pwm controller of the present invention comprises blockade protective device, power supply sensing apparatus and enables device.Block protective device and detect first end points electricity of described Pwm controller and the voltage of second end points; when being lower than the voltage of described second end points behind the described first end-point voltage translation, first pressure reduction; suspend described Pwm controller, to reach the function of under-voltage locking or overcurrent protection.The power supply sensing apparatus detects the voltage of described first end points, and compares with the power supply reference voltage.When behind described first pressure reduction of the voltage translation of described first end points during, be judged as described pulse control signal and receive required power supply greater than described power supply reference voltage.Enable the voltage that device detects described second end points, and with enable reference voltage and compare.When the voltage of described second end points is lower than describedly when enabling reference voltage, forbid described Pwm controller.
The embodiment of pulse frequency modulated controller control method of the present invention comprises first end points that captures Pwm controller and the voltage of second end points.Set first voltage, voltage translation first pressure reduction that wherein said first voltage is described first end points.The voltage of more described first voltage and described second end points when described first voltage is lower than the voltage of described second end points, suspends described Pwm controller.More described first voltage and power supply reference signal when described first voltage is higher than described power supply reference voltage, judge that described pulse-width modulator receives required power supply.The voltage of more described second end points with enable reference voltage, be lower than the described described Pwm controller of forbidding when enabling reference voltage level at the voltage of described second end points.
Another embodiment of Pwm controller of the present invention only comprises eight pins, is respectively feedback pin, enables pin, power pin, ground connection pin, low level side switch control pin, the pin that boosts, phase place pin and high-order side switch control pin.Described Pwm controller utilizes described phase place pin to capture the voltage of first end points, and utilizes the above-mentioned voltage that pin captures described second end points of enabling.Described Pwm controller produces blockade guard signal, power supply sensing signal and disable signal according to the voltage of described first end points and described second end points.Described Pwm controller further produces high-order side switch controlling signal and low level side switch module control signal according to the signal of described blockade guard signal, power supply sensing signal, disable signal, feedback pin, can be used for controlling the high-order side switch module and the low level side switch module of changeover voltage adjuster respectively.
Description of drawings
Fig. 1 shows and uses the schematic diagram that conventional Pwm controller is controlled changeover voltage adjuster;
Fig. 2 shows the block diagram of the embodiment that uses Pwm controller of the present invention;
Fig. 3 shows the connected mode of blocking protective device and first end-point voltage and the second end-point voltage VEN;
Fig. 4 shows another connected mode of blocking protective device and first end-point voltage and the second end-point voltage VEN;
Fig. 5 shows the example of implementing pulse-width controller with eight pin packaged types.
Embodiment
Fig. 2 shows the block diagram of the embodiment that uses Pwm controller 206 of the present invention.In a preferred embodiment of the invention, Pwm controller 206 can be in order to control changeover voltage adjuster 20.Changeover voltage adjuster 20 comprises a pair of high-order side switch module 202 and the low level side switch module 204 of series connection up and down.The phase contact 214 of high and low position side switch module 202,204 and an output stage 216 couplings.By the Pwm controller 206 mutual described high and low position side switch modules 202,204 that switch, can be with input voltage V
InConvert regulated output voltage V to
Out-
One of function of blocking protective device 208 is a under-voltage locking.The usefulness of under-voltage locking means as input voltage V
InLow to can't make Pwm controller 206 intraware operate as normal the time, just make the running time-out of intraware, to avoid producing unexpected output result.In an embodiment of the present invention, block the voltage V that protective device 208 detects the first end points LX of Pwm controller 206
LX, and with the voltage V of this first end points LX
LXThe translation first pressure reduction V
1If the described first end-point voltage V
LXThe described first pressure reduction V of translation
1After be lower than the voltage V of the second end points EN/OCSET of Pwm controller 206
EN, block protective device 208 so and send blockade guard signal UVLO/OC, make the work stoppage of described Pwm controller 206, to avoid the circuit working of inappropriate output influence back level.In other embodiments of the invention, the first pressure reduction V
1Can be electric current I according to first current source
1First resistance R of flowing through
1The cross-pressure of gained and deciding, that is, and the first current source I
1The sense of current can be and flow to the first end points LX or flow out the first end points LX, decide on circuit operation situation at that time.Fig. 3 shows the blockade protective device 208 and the first end-point voltage V
LX, the first current source I
1, first resistance R
1Voltage V with second end points
ENConnected mode.In other embodiments of the invention, the voltage V of second end points
ENCan be by the second current source I
OCSETThe overcurrent of flowing through is set resistance R
SETThe cross-pressure that is caused forms.Fig. 4 shows the blockade protective device 208 and the first end-point voltage V
LX, the first current source I
1, first resistance R
1, the second current source I
OCSET, overcurrent sets resistance R
SETVoltage V with second end points
ENConnected mode.
Block protective device 208 function of overcurrent protection in addition.When the electric current that detects flow through described high-order side switch module 202 or low level side switch module 204 is excessive; block protective device 208 and suspend described Pwm controller 206, do not damage because of excessive electric current to protect high-order side switch module 202 or low level side switch module 204.In an embodiment of the present invention, the method for detection of excessive current is similar to the method for under-voltage locking just.That is, capture the voltage V of the first end points LX of described Pwm controller 206
LX, and with the voltage V of this first end points LX
LXThe translation first pressure reduction V
1If the voltage V of this first end points LX
LXThe translation first pressure reduction V
1After voltage less than the voltage V of second end points
EN, suspend described Pwm controller so.
Pulse-width modulator 206 of the present invention further comprises power supply sensing apparatus 210.Described power supply sensing apparatus 210 detects the described first end-point voltage V
LXThe described first pressure reduction V of translation
1Voltage, and with power supply reference voltage V
InrefCompare.If the described first end-point voltage V
LXThe voltage V of described first pressure reduction of translation
1Greater than described power supply reference voltage V
Inref, so described power supply sensing apparatus 210 judges that described pulse-width modulator 206 receives required power supply.In one embodiment of this invention, when enabling device 212 and stop to send disable signal DIS, the internal circuit that does not necessarily represent Pwm controller begins action fully.Need treat the voltage V of the first end points LX
LXThe described first pressure reduction V of translation
1Power supply reference voltage V greatly too
InrefAfter, just represent Pwm controller to receive required power supply.
In a preferred embodiment of the invention, Pwm controller is a chip with eight pin encapsulation.Fig. 5 shows the example of implementing a pulse-width controller with eight pin packaged types.This eight pin is respectively the pin that boosts (BOOT pin), high-order side switch module control pin (UGATE pin), phase place pin (LX pin), power pin (PVCC pin), the control of low level side switch module pin (LGATE pin), ground connection pin (PGND pin), enables pin (EN/OCSET) pin and feedback pin (FB pin).Wherein BOOT pin, UGATE pin and LX pin are relevant with control high-order side switch module 502; PVCC pin, LGATE pin and PGND pin are relevant with control low level side switch module 504.The EN/OCSET pin enables for providing/pin of the required electric informations of function such as overcurrent amount setting.EN/OCSET pin and overcurrent are set resistance R
SETWith enable control switch 508 coupling.In an embodiment of the present invention, enabling control switch can be realized by the transistor of open drain (open-drain) configuration.Be set to connection when enabling control switch 508, when promptly the DISABLE contact is high logic level, the voltage V of EN/OCSET pin
ENBe earthed voltage.Be set to cut-out when enabling control switch 508, when promptly the DISABLE contact is low logic level, the voltage V of EN/OCSET pin
ENValue is current source I
OCSETCurrent value multiply by overcurrent and set resistance R
SETResistance.The BOOT pin passes through capacitor C
BsWith diode D
1Be coupled to the first power supply V
Cc, in order to the high position supply voltage (supply voltage) of buffer 510 to be provided.The LX pin is connected to the low level supply voltage of buffer 510.The output of buffer 510 is connected to the UGATE pin, in order to control high-order side switch module 502.The PVCC pin is connected to the described first power supply V
Cc, in order to the high position supply voltage of buffer 512 to be provided.The PGND pin is connected to the low level supply voltage of buffer 512, and the output of buffer 512 is connected to the LGATE pin, in order to control low level side switch module 504.The output voltage V of output stage 514
OutThrough resistance R
1, R
2After the dividing potential drop, the FB pin of feedback reversion pulse width modulation controller 506.Pwm controller 506 also comprises blockade protective device, power supply sensing apparatus and enables device, implements with three comparators 516,518 and 520 respectively.Comparator 516 compares voltage translation first pressure reduction of LX pin and the voltage difference of EN/OCSET pin.The first pressure reduction V wherein
1Value be the electric current I of first current source supply
1First resistance R of flowing through
1The pressure reduction that is caused.Second input of comparator 516 is coupled to the EN/OCSET pin.When enabling control switch 508 for cut-out, the magnitude of voltage of EN/OCSET pin is I
OCSET* R
SETVoltage V when the LX pin
LXThe translation first pressure reduction V
1The back is less than EN/OCSET pin V
ENVoltage the time, comparator 516 is sent the UVLO/OC signal, suspends the work of Pwm controller with representative.The first input end coupling of the first input end of comparator 518 and comparator 516, the second input coupled voltages sensing reference voltage V of comparator 518
InrefWhen the magnitude of voltage of the first input end of comparator 518 greater than voltage sensing reference voltage V
InrefThe time, comparator 518 produces voltage sense signal PORE, represents this clock wave width modulation controller 506 to receive the required power supply of work.Second input coupling of the first input end of comparator 520 and comparator 516, its second input and one is enabled reference voltage V
EnrefCoupling.When DISABLE is set to low logic level, enable control device 508 and be switched on, the voltage of the first input end of comparator 520 is about earthed voltage at this moment, so disable signal DIS can be sent.When DISABLE is set to high logic level, enable control device 508 and be cut off, the voltage of the first input end of comparator 520 is about I at this moment
OCSET* R
SET, then disable signal DIS stops to be sent.Output stage 514 comprises low pass filter and the load circuit R that is made up of inductance L, capacitor C
LOutput voltage V
OutThrough resistance R
1, R
2After the dividing potential drop, the FB pin of feedback reversion pulse width modulation controller 506.Pwm controller 506 further comprises on-off controller 522; the action that can come controller buffer 510,512 according to disable signal DIS, power supply sensing signal PORE, locking/guard signal UVLO/OC and the contained signal of FB pin; so that Pwm controller is adjusted the magnitude of voltage of UGATE pin and LGATE pin, and then control the cut-out or the on-state of high-order side switch module 502 and low level side switch module 504.
In a preferred embodiment of the invention, set resistance R if adjust overcurrent
SETResistance, can change overcurrent threshold value I accordingly so
OCSET, its relation can be showed by following formula:
I
1×R
1-R
DS(ON)×I
OCSET＝I
OCSET×R
SET (1)
So,
R wherein
DS (on)Equivalent resistance when low level side switch module is on-state, and I
1, R
1, I
OCSET, R
DS (on)Can be considered definite value.
Can adjust the overcurrent threshold value with carrying different high and low position side switch modules or load circuit so use Pwm controller provided by the invention.
In a preferred embodiment of the invention, Pwm controller is implemented with the packaged chip of eight pins, and has possessed and enable/functions such as forbidding, under-voltage locking, overcurrent protection and power supply sensing.So with Pwm controller in the present routine techniques easily ten packaged types more than the pin compare and save more Material Costs.And the present invention can decide the overcurrent threshold value by the resistance that changes overcurrent setting resistance.Therefore more can flexibly cooperate the work of other high and low position side switch module and load circuit.
Technology contents of the present invention and technical characterstic disclose as above, yet the those skilled in the art still may do all replacement and modifications that does not deviate from spirit of the present invention based on teaching of the present invention and announcement.Therefore, protection scope of the present invention should be not limited to the content that embodiment discloses, and should comprise various do not deviate from replacement of the present invention and modifications, and is contained by appended claims.
Claims (22)
1. Pwm controller, it is characterized in that in order to the control changeover voltage adjuster described Pwm controller comprises:
Block protective device, it is used to detect the voltage of first end points and second end points, to judge whether to suspend described Pwm controller;
The power supply sensing apparatus, it is used to detect the voltage of described first end points and compares with the power supply reference voltage, whether receives required voltage to judge described Pwm controller; And
Enable device, it is used to detect the voltage of described second end points, to judge whether to forbid described Pwm controller.
2. Pwm controller according to claim 1; wherein said blockade protective device detects first voltage; if described first voltage is lower than voltage threshold; suspend described Pwm controller so, the voltage behind voltage translation first pressure reduction that wherein said first voltage is described first end points.
3. Pwm controller according to claim 2, wherein said first pressure reduction are to decide according to the flow through cross-pressure of the first resistance gained of the electric current of first current source, and described first pressure reduction can be positive number or minus negative greater than zero.
4. Pwm controller according to claim 3; wherein said blockade protective device is first comparator; the first input end of described first comparator is coupled to described first end points by described first resistance; described first input end further is coupled to described first current source, and second input of described first comparator is coupled to described second end points.
5. Pwm controller according to claim 3, more described first voltage of wherein said power supply sensing apparatus and power supply reference voltage, if described first voltage is higher than the power supply reference voltage, judge that so described Pwm controller receives required voltage.
6. Pwm controller according to claim 5, wherein said power supply sensing apparatus is second comparator, the first input end of described second comparator is coupled to described first end points by described first resistance, described first input end further is coupled to described first current source, and second input of described second comparator is coupled to the power supply reference voltage.
7. Pwm controller according to claim 1, the wherein said voltage of enabling more described second end points of device and enable reference voltage, if the voltage of described second end points is lower than the described reference voltage of enabling, forbid described Pwm controller so.
8. Pwm controller according to claim 7, the wherein said device of enabling is the 3rd comparator, the first input end of described the 3rd comparator is coupled to described second end points, and second input of described the 3rd comparator is coupled to the described reference voltage of enabling.
9. Pwm controller according to claim 1, wherein said changeover voltage adjuster further comprises overcurrent setting resistance, and described second end points second current source that is coupled, the end that described overcurrent is set resistance is coupled to described second end points, the other end that described overcurrent is set resistance is coupled to earthed voltage, and described voltage threshold is to decide according to the resistance value that the current value and the described overcurrent of described second current source are set resistance.
10. Pwm controller according to claim 9, wherein said changeover voltage adjuster further comprises enables control switch, the described control switch of enabling is coupled to described second end points, and when enabling control switch and being dissengaged positions, described Pwm controller is a disabled status when described.
11. Pwm controller according to claim 1, wherein said changeover voltage adjuster further comprises high-order side switch module and low level side switch module, and described high-order side switch module and described low level side switch module are in contact coupling mutually.
12. the control method of a Pwm controller, it is used to control changeover voltage adjuster, it is characterized in that described method comprises the following step:
First end points of acquisition Pwm controller and the voltage of second end points;
Set first voltage, voltage translation first pressure reduction that wherein said first voltage is described first end points;
The voltage of more described first voltage and described second end points when described first voltage is lower than the voltage of described second end points, suspends described Pwm controller;
More described first voltage and power supply reference signal when described first voltage is higher than described power supply reference voltage, judge that described pulse-width modulator receives required power supply; And
The voltage of more described second end points with enable reference voltage, be lower than describedly when enabling reference voltage level at the voltage of described second end points, forbid described Pwm controller.
13. control method according to claim 12, wherein said first pressure reduction are to decide according to the flow through cross-pressure of the first resistance gained of the electric current of first current source, and described first pressure reduction can be positive number or minus negative greater than zero.
14. control method according to claim 12, it is characterized in that its step further comprises sets resistance with overcurrent and second current source is coupling in described second end points, the other end that described overcurrent is set resistance is coupled to earthed voltage, and the voltage of described second end points is to decide according to described second current source and described overcurrent setting resistance.
15. control method according to claim 14 is characterized in that it further comprises to be coupled to described second end points with enabling control switch, and when described when enabling control switch and being dissengaged positions, described Pwm controller is a disabled status.
16. Pwm controller; it is in order to the control changeover voltage adjuster; it is characterized in that described changeover voltage adjuster comprises high-order side switch module and low level side switch module; described Pwm controller produces blockade guard signal, power supply sensing signal and disable signal according to the voltage of first end points and second end points, and described Pwm controller only comprises eight branch connecting pins.
17. Pwm controller according to claim 16 is characterized in that its eight branch connecting pin is respectively:
The phase place pin, it is in order to capture the voltage of described first end points;
Enable pin, it is in order to capture the voltage of described second end points;
Feedback pin, it is in order to the output voltage receiving feedback signals from described changeover voltage adjuster;
Power pin;
The ground connection pin, wherein said power pin and described ground connection pin are in order to receive supply voltage;
Low level side switch control pin, it controls described low level side switch module in order to output low level side switch controlling signal, and the signal that wherein said low level side switching signal is the signal according to described power pin, described ground connection pin, described feedback signal, described blockade guard signal, described power supply sensing signal and described disable signal produce;
Pin boosts; And
High-order side switch control pin; it controls described high-order side switch module in order to export high-order side switch controlling signal, and the signal that wherein said high-order side switch controlling signal is the signal according to the described pin that boosts, described phase place pin, described feedback signal, described blockade guard signal, described power supply sensing signal and described disable signal produce.
18. Pwm controller according to claim 16, wherein said blockade guard signal are to produce according to voltage translation first pressure reduction of more described first end points and the voltage of second end points.
19. being voltage translation first pressure reduction and the power supply reference voltages according to more described first end points, Pwm controller according to claim 16, wherein said power supply sensing signal produce.
20. Pwm controller according to claim 16, wherein said disable signal are according to the voltage of more described second end points and enable reference voltage and produce.
21. Pwm controller according to claim 16, wherein said changeover voltage adjuster further comprises overcurrent setting resistance, and described second end points second current source that is coupled, the end that described overcurrent is set resistance is coupling in described second end points, the other end that described overcurrent is set resistance is coupled to earthed voltage, and the voltage of described second end points is to decide according to the resistance value that the current value and the described overcurrent of described second current source are set resistance.
22. Pwm controller according to claim 21, wherein said changeover voltage adjuster further comprises enables control switch, the described control switch of enabling is coupled to described second end points, and when enabling control switch and being dissengaged positions, described Pwm controller is a disabled status when described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100061014A CN101499719A (en) | 2008-02-03 | 2008-02-03 | Pulse width modulation controller and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100061014A CN101499719A (en) | 2008-02-03 | 2008-02-03 | Pulse width modulation controller and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101499719A true CN101499719A (en) | 2009-08-05 |
Family
ID=40946632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100061014A Pending CN101499719A (en) | 2008-02-03 | 2008-02-03 | Pulse width modulation controller and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101499719A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102710119A (en) * | 2011-03-28 | 2012-10-03 | 飞兆半导体公司 | Differential sensing for voltage control in a power supply circuit |
| CN103812335A (en) * | 2012-11-09 | 2014-05-21 | 三星电子株式会社 | Electronic apparatus, Power supply apparatus and power supply method |
| CN104218781A (en) * | 2013-05-31 | 2014-12-17 | 浙江三花股份有限公司 | Method and system for over-current protection of power factor correction circuit |
-
2008
- 2008-02-03 CN CNA2008100061014A patent/CN101499719A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102710119A (en) * | 2011-03-28 | 2012-10-03 | 飞兆半导体公司 | Differential sensing for voltage control in a power supply circuit |
| KR20120110059A (en) * | 2011-03-28 | 2012-10-09 | 훼어촤일드 세미컨덕터 코포레이션 | Differential sensing for voltage control in a power supply circuit |
| CN102710119B (en) * | 2011-03-28 | 2016-09-14 | 飞兆半导体公司 | Voltage-controlled differential sensing in supply of electric power circuit |
| KR101960404B1 (en) | 2011-03-28 | 2019-03-20 | 페어차일드 세미컨덕터 코포레이션 | Differential sensing for voltage control in a power supply circuit |
| CN103812335A (en) * | 2012-11-09 | 2014-05-21 | 三星电子株式会社 | Electronic apparatus, Power supply apparatus and power supply method |
| US9825456B2 (en) | 2012-11-09 | 2017-11-21 | Samsung Electronics Co., Ltd. | Electronic apparatus, power supply apparatus, and power supply method |
| CN104218781A (en) * | 2013-05-31 | 2014-12-17 | 浙江三花股份有限公司 | Method and system for over-current protection of power factor correction circuit |
| CN104218781B (en) * | 2013-05-31 | 2017-05-17 | 杭州先途电子有限公司 | Method and system for over-current protection of power factor correction circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101207336B (en) | Transistor driver circuit of power converter | |
| US7741820B2 (en) | Switching voltage regulator pulse width modulation controller and method | |
| CN202978738U (en) | Power converter | |
| CN102160271B (en) | Control method for power control circuit, power supply unit, power supply system, and power controller control method | |
| US7116563B2 (en) | Dual mode over-current protection for switching mode power converter | |
| CN101682259B (en) | Bidirectional DC to DC converter for power storage control in a power scavenging application | |
| CN105281298A (en) | Overcurrent protection device and overcurrent protection method for electronic modules | |
| US20120139345A1 (en) | Control method of hybrid power battery charger | |
| EP1952213B1 (en) | Buck dc to dc converter and method | |
| EP2582029B1 (en) | Switch-mode power supply with linear regulator transient protection | |
| EP2515422A1 (en) | Analog current limit adjustment for linear and switching regulators | |
| CN104917362A (en) | Overvoltage protection for synchronous power rectifier | |
| US8410764B2 (en) | Automatic current limit adjustment for linear and switching regulators | |
| CN103107684A (en) | Power Converter Controller IC Having Pins with Multiple Functions | |
| CN1176515C (en) | Output overvoltage protector for stepdown converter | |
| CN105680677B (en) | Line voltage compensation overcurrent protection dot circuit, device, method and switch power supply system | |
| CN104578734A (en) | Improved gate clamping | |
| CN107251394A (en) | Power supply semiconductor device | |
| CN105610129A (en) | Sampling circuit and overvoltage and under-voltage protection control circuit | |
| CN105322810A (en) | Power conversion device and protection method thereof when current feedback signal is abnormal | |
| CN109428484A (en) | Power-switching circuit | |
| CN101499719A (en) | Pulse width modulation controller and control method thereof | |
| CN104426367A (en) | Boost apparatus with over-current and over-voltage protection function | |
| KR102112077B1 (en) | Uninterruptible power supply with single winding of output winding and inverter winding | |
| CN204030994U (en) | Supply module, switching power source chip and switch power supply system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090805 |