摘要:
The present invention discloses a short-circuit detection circuit and a short-circuit detection method. The short-circuit detection circuit detects whether an output node is short-circuited to a first predetermined level. A first switch circuit which is controlled by a control signal is coupled between the output node and a second predetermined level. The short-circuit detection circuit includes: a determination circuit, which is coupled between the output node and the second predetermined level, wherein when the determination circuit is enabled, it generates a determination signal according to whether the output node is short-circuited to the first predetermined level; and a second switch circuit, which generates a short-circuit detection signal according to the determination signal.
摘要:
A driving circuit for a three-dimensional liquid crystal lens provides a storage to store a high output value and a low output value of the channel output signal; the high and low output values are converted by a digital analog converter as the high output signal, the low output signal and the common signal which are driven by the driving circuit to produce the high driven output signal, the low driven output signal and the common output signal which are selectively output by the select logic circuit as the channel output signal according to the select signal; Thus, less operation amplifiers are needed, and the speed of response of the circuit can be enhanced. Power consumption can be reduced as well.
摘要:
For a charge pump, a control circuit switches two or more input voltages to apply to one or more pumping capacitors under auto-sensing control to modulate a maximum pumping voltage as close as to a demanded output voltage to thereby reduce the difference between the maximum pumping voltage and the output voltage for efficiency and thermal improvement of the charge pump. The maximum pumping voltage is produced by mixing the different input voltages and the charge pump may provide more operation modes.
摘要:
The present invention discloses a short-circuit detection circuit and a short-circuit detection method. The short-circuit detection circuit detects whether an output node is short-circuited to a first predetermined level. A first switch circuit which is controlled by a control signal is coupled between the output node and a second predetermined level. The short-circuit detection circuit includes: a determination circuit, which is coupled between the output node and the second predetermined level, wherein when the determination circuit is enabled, it generates a determination signal according to whether the output node is short-circuited to the first predetermined level; and a second switch circuit, which generates a short-circuit detection signal according to the determination signal.
摘要:
The present invention discloses a power supply circuit with adaptively enabled charge pump. The power supply circuit includes: a buck switching regulator switching at least one power switch therein to convert an input voltage to a middle voltage according to a control signal; a charge pump coupled to the buck switching regulator, wherein when the charge pump is enabled, the charge pump boosts the middle voltage to provide an output voltage higher than the middle voltage, and when the charge pump is disabled, the middle voltage is supplied as the output voltage; and a controller generating the control signal to control the switching regulator, and determining to enable or disable the charge pump according to a level of the input voltage.
摘要:
The present invention discloses a power supply circuit with adaptive input selection and a method for power supply. The power supply circuit includes: a charge pump for receiving at least one voltage and generating a boosted voltage; a first buck switching regulator coupled to a battery, for operating at least one first power transistor to convert a battery voltage to an output voltage according to a first control signal; a second buck switching regulator coupled to the charge pump, for operating at least one second power transistor to convert the boosted voltage to the output voltage according to a second control signal; and a controller generating the first control signal or the second control signal according to a level of the voltage of the battery, to select the first buck switching regulator or the second switching regulator for generating the output voltage.
摘要:
A photosensitive device has packaging elements, a sensor chip and a light-filtering layer. The packaging elements include encapsulant to cover, environmentally seal and protects the photosensitive device against damage from external contaminants and moisture. The sensor chip has a top and a photosensitive area formed on the top. The light-filtering layer filters light that emits on the photosensitive area of the sensor chip to achieve a desired photosensitive response and is mounted to the photosensitive area with a transparent adhesive layer.
摘要:
An accelerating circuit increases the speed of an LED (light-emitting diode) by controlling an LED driving circuit. The LED driving circuit includes two driving transistors. The accelerating circuit includes a pair of series-connected switch units and a pulse generator. The two switch units respectively connect to a first electronic source and a second electronic source. A node point where the two switch units connect together is coupled to a cathode of the LED. The pulse generator includes two input terminals to receive a pair of driving signals to control the switch units to be connected/disconnected in accordance with a pair of output pulse signals of different timing. When the switch units are connected, the two electronic sources can generate forward pulse current/reverse pulse current to deliver the forward pulse current/reverse pulse current to the LED to turn on/off the LED quickly.
摘要:
A multi-stage voltage regulating circuit and method with automatic temperature compensation comprises a plurality of charge-pumps, a temperature compensator, a comparative unit and a control logic circuit; wherein, the temperature compensator detects the ambient temperature and outputs a reference voltage related to the ambient temperature, the comparative unit compares the voltage of the output power source to the reference voltage output by the temperature compensator and outputs a comparative signal based on the comparison, and the control logic circuit controls the charging/discharging operations of the charge-pumps based on the comparative signal and voltages of input power sources connected to said charge-pumps to automatically regulate the voltage of the output power source.
摘要:
A multi-stage voltage regulating circuit and method with automatic temperature compensation comprises a plurality of charge-pumps, a temperature compensator, a comparative unit and a control logic circuit; wherein, the temperature compensator detects the ambient temperature and outputs a reference voltage related to the ambient temperature, the comparative unit compares the voltage of the output power source to the reference voltage output by the temperature compensator and outputs a comparative signal based on the comparison, and the control logic circuit controls the charging/discharging operations of the charge-pumps based on the comparative signal and voltages of input power sources connected to said charge-pumps to automatically regulate the voltage of the output power source.