US20100084543A1 - Voltage converting circuit - Google Patents
Voltage converting circuit Download PDFInfo
- Publication number
- US20100084543A1 US20100084543A1 US12/274,360 US27436008A US2010084543A1 US 20100084543 A1 US20100084543 A1 US 20100084543A1 US 27436008 A US27436008 A US 27436008A US 2010084543 A1 US2010084543 A1 US 2010084543A1
- Authority
- US
- United States
- Prior art keywords
- voltage signal
- light
- voltage
- photosensor
- power supply
- 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
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20209—Thermal management, e.g. fan control
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
Abstract
Description
- 1. Technical Field
- The present disclosure relates to converting circuits, and particularly to a voltage converting circuit.
- 2. Description of the Related Art
- Generally, a voltage converting circuit is connected between a control chip and an electronic component, such as a fan. The voltage converting circuit is configured for converting a low voltage signal, such as a 3V signal that is unfit for the fan, sent out by the control chip to a high voltage signal, such as a 12V signal that is fit for the fan, to meet the voltage demand of the fan. However, the voltage converting circuit generally includes a converting chip and a plurality of transistors, which creates complications and added cost. Furthermore, the voltage converting circuit may distort signals during transmission, which may degrade the fan control circuit's ability to control the fan.
-
FIG. 1 is a block diagram of an embodiment of a voltage converting circuit, together with a fan, a control chip, and a detecting chip. -
FIG. 2 is a circuit diagram ofFIG. 1 . - Referring to
FIGS. 1 and 2 , an embodiment of avoltage converting circuit 6 electronically coupled on a motherboard for converting a voltage supplied for afan 40, includes a firstphotoelectric coupler 10, a secondphotoelectric coupler 20, and aconnector 30 configured for connecting to thefan 40. The firstphotoelectric coupler 10 includes a first light-emitting element, such as a light-emitting diode (LED) D1, and a first photosensor, such as a photoelectric triode Q1. The secondphotoelectric coupler 20 includes a second light-emitting element, such as an LED D2, and a second photosensor, such as a photoelectric triode Q2. Theconnector 30, such as a 3-pin fan connector, includes a power pin VCC, a grounded pin GND, and a sensing pin Sense. - The anode of the LED D1 receives a pulse width modulation (PWM) control signal from a
control chip 50 of the motherboard via a resistor R1, and the cathode of the LED D1 is connected to the grounded pin GND of theconnector 30. The collector of the photoelectric triode Q1 is connected to a first power supply VCC1, such as a 12V power supply. The emitter of the photoelectric triode Q1 is connected to the power pin VCC of theconnector 30 to output a PWM signal to theconnector 30. The anode of the LED D2 is connected to the sensing pin Sense of theconnector 30 via a resistor R2, to receive a sample signal, which is a pulse signal, from theconnector 30. The cathode of the LED D2 is grounded. The collector of the photoelectric triode Q2 is connected to a second power supply VCC2, such as a 3V power supply. The emitter of the photoelectric triode Q2 outputs a sensing signal, which is a pulse signal to a detectingchip 60. The duty cycle of the PWM control signal sent out by thecontrol chip 50 can be adjusted, to control the rotation speed of thefan 40. - The duty cycle of the PWM control signal is similar to the duty cycle of the PWM signal, while the voltage level of the PWM control signal is different from the voltage level of the PWM signal. The voltage level of the PWM control signal is an operating voltage of the
control chip 50, equal to the voltage of the second power supply VCC2. The voltage level of the PWM signal is equal to the voltage of the first power supply VCC1. The duty cycle of the sample signal is similar to the duty cycle of the sensing signal, while the voltage level of the sample signal is different from the voltage level of the sensing signal. The voltage level of the sample signal is an operating voltage of thefan 40, equal to the voltage of the first power supply VCC1. The voltage level of the sensing signal is equal to the voltage of the second power supply VCC2. In summary, both the voltage levels of the PWM control signal and the sensing signal are equal to the voltage of the first power supply VCC1, and both the voltage levels of the PWM signal and the sample signal are equal to the voltage of the second power supply VCC2. - When the PWM control signal sent out by the
control chip 50 is at a high level, such as 3V, the LED D1 turns on. Accordingly, because the LED D1 is turned on, the LED D1 emits light so as to turn on the photoelectric triode Q1. The first power supply VCC1 pulls the voltage level of the PWM signal up to that of the first power supply VCC1 to satisfy the voltage demand of thefan 40. Thefan 40 rotates at a speed controlled by the PWM signal. At this time, the sensing pin Sense of theconnector 30 sends out the sample signal to the LED D2. When the sample signal is at a high level, such as 12V, the LED D2 turns on to emit light to turn on the photoelectric triode Q2. The second power supply VCC2 pulls the voltage level of the sensing signal down to that of the second power supply VCC2 to satisfy the voltage demand of the detectingchip 60. The detectingchip 60 detects the actual rotation speed of thefan 40 according to the sensing signal to determine whether thefan 40 works normally. In one embodiment, the detectingchip 60 is an ITE8712 detecting chip. It may be appreciated that the LED D1 and the LED D2 may emit light in the visible light spectrum. - The LED D1 is not physically or electrically connected to the photoelectric triode Q1, and the LED D2 is not physically or electrically connected to the photoelectric triode Q2. Therefore, each of the first
photoelectric coupler 10 and the secondphotoelectric coupler 20 has an electrical isolation function, which can avoid the PWM control signal and the sample signal being distorted during the process of converting voltage. - It is to be understood, however, that even though numerous characteristics and advantages of the present disclosure have been set forth in the foregoing description, together with details of the structure and function of the disclosure, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Claims (13)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200810304780 | 2008-10-08 | ||
CN200810304780.3 | 2008-10-08 | ||
CN200810304780A CN101714812A (en) | 2008-10-08 | 2008-10-08 | Fan control circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
US7683356B1 US7683356B1 (en) | 2010-03-23 |
US20100084543A1 true US20100084543A1 (en) | 2010-04-08 |
Family
ID=42026966
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/274,360 Expired - Fee Related US7683356B1 (en) | 2008-10-08 | 2008-11-20 | Voltage converting circuit |
Country Status (2)
Country | Link |
---|---|
US (1) | US7683356B1 (en) |
CN (1) | CN101714812A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101924459A (en) * | 2010-07-06 | 2010-12-22 | 浙江大学 | Switching signal interface circuit based on double photoelectric isolation |
GB2595296A (en) * | 2020-05-21 | 2021-11-24 | Tdk Lambda Uk Ltd | Fan controller |
US11385330B2 (en) | 2017-02-10 | 2022-07-12 | Omron Corporation | Photoelectric sensor and light emitter with abnormality detection |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103972857A (en) * | 2013-01-28 | 2014-08-06 | 鸿富锦精密工业(深圳)有限公司 | Fan control chip protection circuit |
CN104235034A (en) * | 2013-06-17 | 2014-12-24 | 鸿富锦精密电子(天津)有限公司 | Fan circuit |
CN104279175A (en) * | 2013-07-10 | 2015-01-14 | 鼎点视讯科技有限公司 | Fan control method, device and system |
CN105171212A (en) * | 2015-08-27 | 2015-12-23 | 江苏扬子鑫福造船有限公司 | Non-contact switch for thermal cutting equipment |
CN105065317B (en) * | 2015-09-04 | 2017-03-22 | 宋彦震 | Automatic frequency adjustment fan and control method thereof |
CN109412575B (en) * | 2018-11-30 | 2022-09-27 | 中国电子科技集团公司第四十四研究所 | High-speed digital photoelectric coupler with selectable transmission directions |
CN110056529B (en) * | 2019-06-04 | 2023-12-26 | 安图实验仪器(郑州)有限公司 | Fan start-stop control module with rotation speed detection function |
Citations (15)
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US5313150A (en) * | 1991-07-05 | 1994-05-17 | Hitachi, Ltd. | Drive control apparatus for an air conditioner having a modular inverter and a control circuit mounted on a common substrate |
US5631800A (en) * | 1995-02-24 | 1997-05-20 | Samsung Electronics Co., Ltd. | Apparatus for determining operating state of cooling fan |
US6320776B1 (en) * | 1999-02-24 | 2001-11-20 | Mitsubishi Denki Kabushiki Kaisha | Power drive apparatus |
US20020043967A1 (en) * | 2000-10-18 | 2002-04-18 | Masaaki Ogata | High-voltage interface |
US6495932B1 (en) * | 1997-09-26 | 2002-12-17 | Hitachi Koki Co., Ltd. | DC power source unit |
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US20060049786A1 (en) * | 2004-03-09 | 2006-03-09 | Foxconn Technology Co.,Ltd | Circuit for fan motor |
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US7352094B2 (en) * | 2001-11-26 | 2008-04-01 | Ebm-Papst St. Georgen, Gmbh & Co., Kg | Equipment fan |
US20080100239A1 (en) * | 2006-10-31 | 2008-05-01 | Adda Corp. | Ac fan motor driving circuit having capability of monitoring the rotation rate and status of the ac fan motor |
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US4355237A (en) * | 1980-08-04 | 1982-10-19 | Texas Instruments Incorporated | High speed AC/DC coupler |
CN100345361C (en) * | 2005-03-10 | 2007-10-24 | 上海交通大学 | Isolation voltage regulation circuit regulated by pulse wide of single-chip machine |
CN200942784Y (en) * | 2006-06-05 | 2007-09-05 | 方大集团股份有限公司 | Circuit for increasing voltage in a moment |
-
2008
- 2008-10-08 CN CN200810304780A patent/CN101714812A/en active Pending
- 2008-11-20 US US12/274,360 patent/US7683356B1/en not_active Expired - Fee Related
Patent Citations (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5313150A (en) * | 1991-07-05 | 1994-05-17 | Hitachi, Ltd. | Drive control apparatus for an air conditioner having a modular inverter and a control circuit mounted on a common substrate |
US5631800A (en) * | 1995-02-24 | 1997-05-20 | Samsung Electronics Co., Ltd. | Apparatus for determining operating state of cooling fan |
US6495932B1 (en) * | 1997-09-26 | 2002-12-17 | Hitachi Koki Co., Ltd. | DC power source unit |
US20040084640A1 (en) * | 1998-11-17 | 2004-05-06 | Fisher & Paykel Limited | Laundry machine |
US6320776B1 (en) * | 1999-02-24 | 2001-11-20 | Mitsubishi Denki Kabushiki Kaisha | Power drive apparatus |
US20020043967A1 (en) * | 2000-10-18 | 2002-04-18 | Masaaki Ogata | High-voltage interface |
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US7148738B2 (en) * | 2004-02-17 | 2006-12-12 | Siemens Energy & Automation, Inc. | Systems, devices, and methods for providing control signals |
US20060049786A1 (en) * | 2004-03-09 | 2006-03-09 | Foxconn Technology Co.,Ltd | Circuit for fan motor |
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US20050253744A1 (en) * | 2004-05-13 | 2005-11-17 | Johnson Controls Technology Company | Configurable output circuit and method |
US20070019934A1 (en) * | 2005-07-22 | 2007-01-25 | Chin-Long Ku | Pulse-width modulation motor speed control circuit |
US7221858B2 (en) * | 2005-07-22 | 2007-05-22 | Foxconn Technology Co., Ltd. | Pulse-width modulation motor speed control circuit |
US20080100239A1 (en) * | 2006-10-31 | 2008-05-01 | Adda Corp. | Ac fan motor driving circuit having capability of monitoring the rotation rate and status of the ac fan motor |
US7385369B2 (en) * | 2006-10-31 | 2008-06-10 | Adda Corp. | AC fan motor driving circuit having capability of monitoring the rotation rate and status of the AC fan motor |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101924459A (en) * | 2010-07-06 | 2010-12-22 | 浙江大学 | Switching signal interface circuit based on double photoelectric isolation |
US11385330B2 (en) | 2017-02-10 | 2022-07-12 | Omron Corporation | Photoelectric sensor and light emitter with abnormality detection |
GB2595296A (en) * | 2020-05-21 | 2021-11-24 | Tdk Lambda Uk Ltd | Fan controller |
Also Published As
Publication number | Publication date |
---|---|
US7683356B1 (en) | 2010-03-23 |
CN101714812A (en) | 2010-05-26 |
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