US20130257516A1 - Switch circuit and electronic device using the same - Google Patents
Switch circuit and electronic device using the same Download PDFInfo
- Publication number
- US20130257516A1 US20130257516A1 US13/597,235 US201213597235A US2013257516A1 US 20130257516 A1 US20130257516 A1 US 20130257516A1 US 201213597235 A US201213597235 A US 201213597235A US 2013257516 A1 US2013257516 A1 US 2013257516A1
- Authority
- US
- United States
- Prior art keywords
- circuit
- output
- capacitor
- power switch
- switch circuit
- 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.)
- Granted
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Classifications
-
- 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
-
- 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
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
Definitions
- the present disclosure relates to switch circuits and, particularly, to a switch circuit for reducing fluctuation of the output voltage of the switch circuit.
- FIG. 1 illustrates a known switch circuit 10 , which includes a power switch transistor 11 , a controlling circuit 12 , and a regulated capacitor 13 .
- the power switch transistor 11 is a n-channel metal-oxide-semiconductor field-effect transistor (MOSFET) and connected between input 1 and output 2 of the switch circuit 10 .
- MOSFET metal-oxide-semiconductor field-effect transistor
- a drain 4 of the power switch is connected to the input 1 of the switch circuit 10
- a source 5 of the power switch is connected to the output 2 of the switch circuit 10
- a gate (controlling electrode) 6 of the power switch transistor 11 is connected to output 3 of the controlling circuit 12 .
- the controlling circuit 12 outputs pulse width modulation (PWM) signals to turn the power switch transistor 11 on and off and further to turn the switch circuit 10 on and off.
- PWM pulse width modulation
- the regulated capacitor 13 is connected between output 2 of the switch circuit 10 and ground to stabilize the output voltage of the switch circuit 10 . However, at the moment when the power switch transistor 11 is turned on, the regulated capacitor 13 is charged first, thereby causing the output voltage of the switch circuit 10 to be less than the desired level.
- FIG. 1 is a circuit diagram of a conventional switch circuit.
- FIG. 2 is a circuit diagram of a switch circuit in accordance with an exemplary embodiment.
- FIG. 2 illustrates a circuit diagram of a switch circuit 100 in accordance with an exemplary embodiment.
- the switch circuit 100 further includes a capacitor 14 .
- One end of the capacitor 14 is connected to the output 3 of the controlling circuit 12 and the controlling electrode 6 of the power switch transistor 11 .
- the other end of the capacitor 14 is connected to ground.
- the capacitor 14 increases an inclination of a rising edge and a falling edge of PWM signals to slow down the speed of the power switch transistor 11 switching on and off, thereby the regulated capacitor 13 is charged slowly and the output voltage of the switch circuit 100 is stable.
- a filter circuit 15 connected between the power switch transistor 11 and the output 2 of the switch circuit 100 is for regulating the output voltage of the switch circuit 100 .
- the power switch transistor 11 is a metal-oxide-semiconductor field-effect transistor (MOSFET), in other embodiments, the power switch transistor may be a bipolar junction transistor (BJT).
- MOSFET metal-oxide-semiconductor field-effect transistor
- BJT bipolar junction transistor
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electronic Switches (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
Description
- 1. Technical Field
- The present disclosure relates to switch circuits and, particularly, to a switch circuit for reducing fluctuation of the output voltage of the switch circuit.
- 2. Description of Related Art
- In a switch circuit of an electronic device, a regulated capacitor is connected between an output of the switch circuit and ground to stabilize the output voltage of the switch circuit.
FIG. 1 illustrates a knownswitch circuit 10, which includes apower switch transistor 11, a controllingcircuit 12, and a regulatedcapacitor 13. Thepower switch transistor 11 is a n-channel metal-oxide-semiconductor field-effect transistor (MOSFET) and connected between input 1 andoutput 2 of theswitch circuit 10. Adrain 4 of the power switch is connected to the input 1 of theswitch circuit 10, a source 5 of the power switch is connected to theoutput 2 of theswitch circuit 10, a gate (controlling electrode) 6 of thepower switch transistor 11 is connected tooutput 3 of the controllingcircuit 12. The controllingcircuit 12 outputs pulse width modulation (PWM) signals to turn thepower switch transistor 11 on and off and further to turn theswitch circuit 10 on and off. The regulatedcapacitor 13 is connected betweenoutput 2 of theswitch circuit 10 and ground to stabilize the output voltage of theswitch circuit 10. However, at the moment when thepower switch transistor 11 is turned on, the regulatedcapacitor 13 is charged first, thereby causing the output voltage of theswitch circuit 10 to be less than the desired level. - The components of the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout.
-
FIG. 1 is a circuit diagram of a conventional switch circuit. -
FIG. 2 is a circuit diagram of a switch circuit in accordance with an exemplary embodiment. -
FIG. 2 illustrates a circuit diagram of aswitch circuit 100 in accordance with an exemplary embodiment. Compared to the prior art, theswitch circuit 100 further includes acapacitor 14. One end of thecapacitor 14 is connected to theoutput 3 of the controllingcircuit 12 and the controllingelectrode 6 of thepower switch transistor 11. The other end of thecapacitor 14 is connected to ground. Thecapacitor 14 increases an inclination of a rising edge and a falling edge of PWM signals to slow down the speed of thepower switch transistor 11 switching on and off, thereby the regulatedcapacitor 13 is charged slowly and the output voltage of theswitch circuit 100 is stable. - In the embodiment, a
filter circuit 15 connected between thepower switch transistor 11 and theoutput 2 of theswitch circuit 100 is for regulating the output voltage of theswitch circuit 100. - In the embodiment, the
power switch transistor 11 is a metal-oxide-semiconductor field-effect transistor (MOSFET), in other embodiments, the power switch transistor may be a bipolar junction transistor (BJT). - Although the present disclosure has been specifically described on the basis of preferred embodiments, the disclosure is not to be construed as being limited thereto. Various changes or modifications may be made to the embodiment without departing from the scope and spirit of the disclosure.
Claims (10)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201210087309.X | 2012-03-29 | ||
CN201210087309 | 2012-03-29 | ||
CN201210087309XA CN103368545A (en) | 2012-03-29 | 2012-03-29 | Switch circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
US20130257516A1 true US20130257516A1 (en) | 2013-10-03 |
US8552792B1 US8552792B1 (en) | 2013-10-08 |
Family
ID=49234104
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/597,235 Expired - Fee Related US8552792B1 (en) | 2012-03-29 | 2012-08-28 | Switch circuit and electronic device using the same |
Country Status (3)
Country | Link |
---|---|
US (1) | US8552792B1 (en) |
CN (1) | CN103368545A (en) |
TW (1) | TW201340600A (en) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5239446Y2 (en) * | 1971-10-20 | 1977-09-07 | ||
US5719519A (en) * | 1995-11-20 | 1998-02-17 | Motorola, Inc. | Circuit and method for reconstructing a phase current |
FR2796777B1 (en) * | 1999-07-20 | 2001-09-21 | St Microelectronics Sa | CONTROL OF A POWER MOS TRANSISTOR |
IT1318238B1 (en) * | 2000-07-25 | 2003-07-28 | St Microelectronics Srl | SELF-LIFT CIRCUIT IN DC / DC STATIC CONVERTERS. |
US7245174B2 (en) * | 2004-09-23 | 2007-07-17 | Zetex Plc | Analogue switch |
US7893791B2 (en) * | 2008-10-22 | 2011-02-22 | The Boeing Company | Gallium nitride switch methodology |
TWI381618B (en) * | 2008-12-22 | 2013-01-01 | Asustek Comp Inc | Switching power supply applied and computer system |
-
2012
- 2012-03-29 CN CN201210087309XA patent/CN103368545A/en active Pending
- 2012-04-05 TW TW101111981A patent/TW201340600A/en unknown
- 2012-08-28 US US13/597,235 patent/US8552792B1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US8552792B1 (en) | 2013-10-08 |
TW201340600A (en) | 2013-10-01 |
CN103368545A (en) | 2013-10-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: HON HAI PRECISION INDUSTRY CO., LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:REN, DONG-LIANG;REEL/FRAME:028865/0054 Effective date: 20120827 Owner name: HONG FU JIN PRECISION INDUSTRY (SHENZHEN) CO., LTD Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:REN, DONG-LIANG;REEL/FRAME:028865/0054 Effective date: 20120827 |
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REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees |
Free format text: PATENT EXPIRED FOR FAILURE TO PAY MAINTENANCE FEES (ORIGINAL EVENT CODE: EXP.) |
|
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20171008 |