Did You Know...
...that it was melting ice cream that inspired the invention of the outboard motor? It was a lovely August day and Ole Evinrude was rowing his boat to his favorite island picnic spot. As he rowed, he watched his ice cream melt and wished he had a faster way to get to the island. At that moment the idea for the outboard motor was born!
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| Number | Title | Issue Date |
| 7858466 | Different-voltage device manufactured by a CMOS compatible process and high-voltage device used in the different-voltage device A method of manufacturing different-voltage devices mainly comprises forming at least one high-voltage well in high-voltage device regions, at least one N-well in low-voltage device regions, at least one P-well in low-voltage device regions, source/drain wells in hi... | 12/28/2010 |
| 7417287 | Electrostatic discharge device having controllable trigger voltage An electrostatic discharge (ESD) device has a parasitic SCR structure and a controllable trigger voltage. The controllable trigger voltage of the ESD device is achieved by modulating a distance between an edge of a lightly doped well and an edge of a heavily doped r... | 08/26/2008 |
| 7362592 | Switching control circuit for primary-side controlled power converters The present invention discloses a switching control circuit for a primary-side controlled power converter. A voltage-waveform detector produces a voltage-feedback signal and a discharge-time signal. A current-waveform detector generates a current-waveform signal by ... | 04/22/2008 |
| 7362593 | Switching control circuit having off-time modulation to improve efficiency of primary-side controlled power supply A voltage-waveform detector produces a voltage-feedback signal and a discharge-time signal by multi-sampling a voltage signal of a transformer. The discharge-time signal represents a discharge time of a secondary-side switching current. A voltage-loop error amplifie... | 04/22/2008 |
| 7355250 | Electrostatic discharge device with controllable holding current An electrostatic discharge (ESD) device with a parasitic silicon controlled rectifier (SCR) structure and controllable holding current is provided. A first distance is kept between a first N+ doped region and a first P+ doped region, and a second distance is kept be... | 04/08/2008 |
| 7285837 | Electrostatic discharge device integrated with pad A structure of an electrostatic discharge (ESD) device integrated with a pad is provided. The ESD device is integrated with the pad and formed under the pad. By using the area under the pad, the ESD device does not occupy additional space of an integrated circuit. F... | 10/23/2007 |
| 7205201 | CMOS compatible process with different-voltage devices A method of manufacturing different-voltage devices mainly comprises forming at least one high-voltage well in high-voltage device regions, at least one N-well in low-voltage device regions, at least one P-well in low-voltage device regions, source/drain wells in hi... | 04/17/2007 |
| 7151681 | Multiple-sampling circuit for measuring reflected voltage and discharge time of a transformer A multiple-sampling circuit is proposed for measuring a voltage signal and a discharge time of a transformer. Sampling signals are used for generating hold voltages by alternately sampling the reflected voltage from the transformer. A buffer amplifier generates a bu... | 12/19/2006 |
| 7102194 | High voltage and low on-resistance LDMOS transistor having radiation structure and isolation effect A high voltage LDMOS transistor according to the present invention includes at least one P-field block in the extended drain region of the N-well. The P-field blocks form junction-fields in the N-well for equalizing the capacitance of parasitic capacitors between th... | 09/05/2006 |
| 7091710 | Low dropout voltage regulator providing adaptive compensation A method and apparatus to dynamically modify internal compensation of a low dropout (LDO) voltage regulator is provided. The LDO voltage regulator includes an output pass transistor, an error amplifier, a bias transistor and a compensation network. The compensation ... | 08/15/2006 |
| 7061225 | Apparatus and method thereof for measuring output current from primary side of power converter An apparatus and method thereof for measuring an output current from a primary side of a power converter are provided. A peak detector is designed to sample a peak value of a converted voltage of a primary-side switching current. A zero-current detector detects a di... | 06/13/2006 |
| 7061780 | Switching control circuit with variable switching frequency for primary-side-controlled power converters The invention presents a switching control circuit for a primary-side-controlled power converter. A pattern generator produces a digital pattern to control a programmable capacitor that is connected to an oscillator, which produces frequency hopping to reduce the EM... | 06/13/2006 |
| 7054170 | Power-mode controlled power converter A power-mode controlled power converter is capable of supplying a constant output voltage and output current. A PWM controller generates a PWM signal in response to a voltage sampled from a transformer auxiliary winding. A programmable current-sink and a detection r... | 05/30/2006 |
| 7042028 | Electrostatic discharge device An electrostatic discharge (ESD) device, which functions like a diode during normal IC operation and like a SCR during an electrostatic discharge event, is provided. To form an equivalent SCR structure, the ESD device includes a plurality of N+ regions and a plurali... | 05/09/2006 |
| 7016204 | Close-loop PWM controller for primary-side controlled power converters A close-loop PWM controller for a primary-side controlled power converter is provided. A voltage-waveform detector produces a voltage-feedback signal and a discharge-time signal. A current-waveform detector generates a current-waveform signal by measuring a primary-... | 03/21/2006 |
| 6995428 | High voltage LDMOS transistor having an isolated structure A high voltage LDMOS transistor according to the present invention includes a P-field and divided P-fields in an extended drain region of a N-well. The P-field and divided P-fields form junction-fields in the N-well, in which a drift region is fully depleted before ... | 02/07/2006 |
| 6954367 | Soft-switching power converter A pulse width modulated soft-switching power converter has a transformer with a primary winding and a secondary winding, a secondary circuit coupled to the secondary winding, and a pair of main switches and a pair of auxiliary switches coupled to the primary winding... | 10/11/2005 |
| 6903421 | Isolated high-voltage LDMOS transistor having a split well structure The isolated high-voltage LDMOS transistor according to the present invention includes a split N-well and P-well in the extended drain region. The P-well is split in the extended drain region of the N-well to form a split junction-field in the N-well. The split N-we... | 06/07/2005 |
| 6900623 | Power supply having multi-vector error amplifier for power factor correction A regulated power supply having power factor correction control includes a multi-vector error amplifier. The multi-vector error amplifier provides an error signal that is used to regulate a switching mechanism of the power supply. The multi-vector error amplifier ac... | 05/31/2005 |
| 6873011 | High voltage and low on-resistance LDMOS transistor having equalized capacitance A high voltage LDMOS transistor according to the present invention includes P-field blocks in the extended drain region of a N-well. The P-field blocks form the junction-fields in the N-well for equalizing the capacitance of parasitic capacitors between the drain re... | 03/29/2005 |
| 6862194 | Flyback power converter having a constant voltage and a constant current output under primary-side PWM control A primary-side flyback power converter supplies a constant voltage and a constant current output. To generate a well-regulated output voltage under varying load conditions, the power converter includes a PWM controller. The PWM controller generates a PWM signal to c... | 03/01/2005 |
| 6853563 | Primary-side controlled flyback power converter The present invention provides a primary-side flyback power converter that supplies a constant voltage output and a constant current output. To generate a well-regulated output voltage under varying load conditions, a PWM controller is included in the power converte... | 02/08/2005 |
| 6839247 | PFC-PWM controller having a power saving means A PFC-PWM controller with a power saving means is disclosed. A built-in current synthesizer generates a bias current in response to feedback voltages sampled from the PWM circuit and the PFC circuit. The bias current modulates the oscillation frequency to further re... | 01/04/2005 |
| 6836415 | Primary-side regulated pulse width modulation controller with improved load regulation The present invention provides a primary-side regulated PWM controller with improved load regulation. In every PWM cycle, a built-in feedback voltage samples and holds a flyback voltage from the auxiliary winding of the transformer via a sampling switch and generate... | 12/28/2004 |
| 6812769 | Switched charge multiplier-divider The switched charge multiplier-divider according to the present invention is constructed of CMOS devices. Capacitor charge theory is employed to implement the circuit of the switched charge multiplier-divider. The switched charge multiplier-divider includes an outpu... | 11/02/2004 |
| 6768655 | Discontinuous mode PFC controller having a power saving modulator and operation method thereof The present invention discloses a ZCS discontinuous mode PFC controller having a power saving modulator. The controller turns on through the feedback resistor and the parasitic diode of the controller, thus eliminating the need for a startup resistor. To achieve ZCS... | 07/27/2004 |
| 6768657 | Current-driven PWM controller having a power saving means Incorporating the PWM function with the power saving means develops the PWM controller in which the switching frequency is decreased in response to the decrease of the load. Further, the current-driven design minimizes the circuitry and reduces the cost of the PWM c... | 07/27/2004 |
| 6765374 | Low drop-out regulator and an pole-zero cancellation method for the same A method an apparatus to dynamically modify the internal compensation of a low drop-out (LDO) linear voltage regulator is presented. The process involves creating an additional equivalent series resistance (ESR) from an internal circuit. The additional ESR of the in... | 07/20/2004 |
| 6744649 | Zero switching power converter operable as asymmetrical full-bridge converter A pulse width modulated soft-switching power converter, having a pair of main switches and a pair of auxiliary switches coupled to the primary winding of the transformer. The main switches and auxiliary switches intermittently conduct an input voltage source to the ... | 06/01/2004 |
| 6744611 | Over-voltage crowbar for lightning surge and ESD protection FI over-voltage crowbar provides lightning surge and ESD protection. The crowbar has a clamping transistor, which is driven by a mirror-amplifier. When an input surge voltage is higher than the voltage of a Zener diode, the mirror-amplifier will be switched on and g... | 06/01/2004 |
| 6674656 | PWM controller having a saw-limiter for output power limit without sensing input voltage A PWM controller having a saw-limiter for power limit without input voltage sensing. The saw-limiter has an adder, a reference voltage, a scaler and a saw-tooth signal that is generated by the PWM oscillator. The saw-limiter produces a saw-limited voltage... | 01/06/2004 |
| 6661679 | PWM controller having adaptive off-time modulation for power saving An adaptive off-time modulator of a PWM controller is provided for power saving in the light-load and no-load conditions. The maximum on-time is kept as a constant and a bias current of the oscillator in the PWM controller is moderated to achieve the off-... | 12/09/2003 |
| 6611439 | PWM controller for controlling output power limit of a power supply A PWM controller has a line voltage input that allows using an input resistor for both start-up and power-limit compensation, thus saving the power consumption, easing the PCB layout, and shrinking the power supply size. In the integrated circuit, a mirro... | 08/26/2003 |
| 6418002 | Power supply supervisor having a line voltage detector A power supply supervisor having a line voltage detector is used to monitor a power supply. A peak detector detects the line voltage by measuring the PWM switching signal in the secondary of the transformer. A logic circuit couples to the peak detector an... | 07/09/2002 |
| 6353405 | Low distortion video analog-to-digital converter An analog to digital video converter is made of a differential correlated double sampling (DCDS) module, a DC bias circuit, an adjustment module and an analog-to-digital converter. The DCDS module samples a red, a green, and a blue analog signal respectiv... | 03/05/2002 |
| 6262549 | Fan speed pulse filter for a PWM fan A fan speed pulse filter is used for a PWM fan. The filter comprises a comparator, a latch circuit and a synchronizer. The fan unit, including a tachometer pulse output, is controlled by a PWM signal for determining the fan speed. By comparing the PWM sig... | 07/17/2001 |
