50results about How to "Extended output voltage range" patented technology

A string DAC having 2^M string resistors includes a plurality of switches for selectively coupling, according to the decoding of an M-bit MSB subword, the voltage across a string resistor to an interpolation sub-DAC which interpolates it according to the decoding of an N-bit mid-subword. The voltage across the string resistor is multiplexed, according to the decoding of an N-bit mid-subword, to various inputs of 2^N differential transistor pairs of an interpolation amplifier. A P-bit delta sigma modulator produces a delta sigma modulated signal, according to a P-bit LSB subword, to control multiplexing of voltages on the terminals of the string resistor to an input of one of the differential transistor pairs selected by decoding of the N-bit mid-subword to monotonically average a contribution of the selected differential transistor pair to generation of an output voltage representing a word including the M-bit, N-bit, and P-bit subwords.

An output terminal of a photoelectric conversion element included in the photoelectric conversion device is connected to a drain terminal and a gate terminal of a MOS transistor which is diode-connected, and a voltage V_out generated at the gate terminal of the MOS transistor is detected in accordance with a current I_p which is generated at the photoelectric conversion element. The voltage V_out generated at the gate terminal of the MOS transistor can be directly detected, so that the range of output can be widened than a method in which an output voltage is converted into a current by connecting a load resistor, and so on.

An embodiment of the invention provides a precharge controlling method, including the steps of: providing a voltage generating circuit with an output circuit for outputting a voltage having a necessary level, and a comparator; judging an output voltage from the output circuit in the comparator during a precharge time period, and feeding back an output signal from the comparator to the output circuit; and controlling a precharge voltage until the voltage having the necessary level outputted from the output circuit is reached.

A motor control device has a three-phase bridge circuit, a driving circuit, and a microcomputer. The three-phase bridge circuit has three pairs of MOSFETs for U, V, and W phases of a three-phase AC motor as a control target. The microcomputer has a dead time set value storage unit and a PWM signal generation unit. The PWM signal generation unit generates a PWM signal with a dead time including a response characteristics of the pair of MOSFETs for each of U, V, and W phases of the AC motor based on a three-phase voltage instruction value supplied from an outside device and the dead time set value stored in the dead time set value storage unit. The PWM signal generation unit outputs the PWM signal for each phase to the driving circuit. This independently adjusts the dead time for the MOSFETs for each phase.

The invention relates to drive power source of piezoelectric ceramic that comprises RS232 interface circuit, digital signal processor (DSP), and keyboard and display interface circuit, high voltage regulated voltage circuit, high voltage amplification system and drive circuit. The output end of the RS232 interface circuit and keyboard and display interface circuit are connected with the input end of the digital signal processor, the input end of the analog-to-digital converter circuit controls the voltage signal, the output end is connected with the input end of the digital signal processor, the output end of the digital signal processor is connected with the input end of the analog-to-digital converter circuit, the output end of the analog-to-digital converter circuit is connected with the input end of the high voltage amplification system, the output end of the high voltage amplification system is connected with the positive pole of the piezoelectricity or electrostriction ceramics L, the negative pole is connected with the low voltage end LV. The invention adopts the digital signal processor as the core; the drive circuit adopts the multi groups of MOS tube to construct, the peak current and power is big, the circuit possesses property that the dynamic response is well, reliability is high, null shift is small, the precision is high, adjustment is convenient.

A light-receiving amplifier circuit of the present invention includes: a first preamplifier circuit to which a light-receiving element is connected; a second preamplifier circuit which is the same type as the first preamplifier circuit and which is apart from the light-receiving element; and a differential amplifier circuit for amplifying output voltage differential between the preamplifier circuits, wherein each of the first preamplifier circuit includes an amplifier and first and second plural feedback resistors, each of which resistors has an end commonly connected to an input terminal of the amplifier; an amplification factor of the differential amplifier circuit is less than one; and the first preamplifier circuit includes an output voltage expanding circuit which is connected to (i) another end of the first feedback resistors in the first preamplifier circuit and (ii) an output terminal of the amplifier, and which circuit is for expanding an output voltage range from the amplifier and supplying the expanded output voltage range to the differential amplifier circuit. This configuration provides a light-receiving circuit which is capable of reducing heat noise to prevent deterioration of the S/N ratio, while avoiding narrowing down of an output voltage range.

The invention relates to a voltage amplitude limiting circuit for controlling a current supply switch of a current steering analog-to-digital converter (DAC). The voltage amplitude limiting circuit comprises a first switch unit and a second switch unit which are arranged between an output end and a grounding end of the amplitude limiting circuit in parallel, a standard inverter of which the input end is electrically connected with the input end of the amplitude limiting circuit, and a resistance unit and a third switch unit which are arranged between a voltage supply and the output end of the amplitude limiting circuit in parallel, wherein the first switch unit controls the on and off between the output end and the grounding end of the amplitude limiting circuit according to signal voltage of the input end of the amplitude limiting circuit; the second switch unit controls the on and off between the output end and the grounding end of the amplitude limiting circuit according to the signal voltage of the input end of the amplitude limiting circuit; and the third switch unit controls the on and off between the voltage supply and the output end of the amplitude limiting circuit according to the signal voltage of the output end of the standard inverter. By adopting the amplitude limiting circuit provided by the invention, burrs of the output signal of the DAC are reduced; the dynamic performance of the DAC is improved; and an output voltage range of the DAC is increased.

The invention provides a high voltage output device and method for a feed line automation test. The high voltage output method comprises the steps: a DA output signal is received through a bridge structure circuit, and is converted into two channels of control signals through a phase shifting mode, wherein the amplitudes of the two channels of control signals are identical to each other and the phase difference between the phases of the two channels of control signals is 180DEG; the two channels of control signals respectively control two independent amplitude and power amplifiers to perform amplification of amplitude and power; the amplified two channels of control signals are fed back to the front end through a hardware negative feedback mode to guarantee the accuracy and the stability for signal output; as the circuit structures of the two parts are fully symmetrical, a voltage output of two channels of voltages to ground is obtained, wherein the two channels of voltages to ground are 0-120V and the phase difference between the phases of the two channels of voltages to ground is 180DEG; and at this time output of one channel is taken as the reference ground so that output of high voltage can be obtained. Compared with the prior art, the high voltage output device and method for a feed line automation test can directly realize output of high voltage through a hardware circuit, and greatly improve the output voltage range of a feed line automation tester so that wiring is more convenient during the field testing process.

The invention discloses a bidirectional DC-DC converter. The bidirectional DC-DC converter comprises a three-phase bridge type switch circuit, a resonant cavity, three transformers and a three-phase bridge type rectification circuit, wherein the resonant cavity comprises three resonant circuits; each resonant circuit comprises a capacitor and two inductors, and one end of one inductor is connected with one end of the capacitor and one end of the other inductor; the other end of any inductor of each of the three resonance circuits is correspondingly connected with the midpoint of a corresponding bridge arm in the three bridge arms of the three-phase bridge type switch circuit, and the other ends of the other inductors of the three resonance circuits are correspondingly connected with dotted terminals of three transformer primary windings; the dotted terminals of three transformer secondary windings are respectively and correspondingly connected with midpoints of three bridge arms of the three-phase bridge rectification circuit; synonym terminals of the three transformer secondary windings are mutually connected to form Y-shaped connection; and synonym terminals of the primary windings are mutually connected to form Y-shaped connection, and are connected with the other ends of the capacitors in the three resonance circuits.

The invention discloses a three phase buck-boost type three level inverter. The three phase buck-boost type three level inverter is characterized in that a circuit type of the three phase buck-boost type three level inverter comprises a direct current bus, a switch tube, a diode, an electric inductor and a capacitor. The three phase buck-boost type three level inverter has the advantages of being used in a buck-boost type occasion under the circumstance that a transformer or a forestage direct current convertor is not needed, small in size, high in efficiency, low in cost, capable of achieving the purpose that amplitude of output voltage is larger than or less than amplitude of input voltage, large in output voltage range, and high in maximum direct current voltage utilization ratio, needing low direct current bus voltage under the circumstance of meeting the same three phase load or the same three phase grid demands as a traditional buck-boost type inverter, having common mode rejection ability, and being suitable for a middle and high voltage occasion due to the fact that voltage stress of the switch tube is one half of the traditional buck-boost type inverter such as a three phase buck-boost type inverter.

A camera module according to an embodiment of the present invention includes a first plate including a cavity formed therein to accommodate a conductive liquid and a non-conductive liquid; an electrode unit disposed on the first plate, the electrode unit being electrically connected to an external power source to change an interface between the conductive liquid and the non-conductive liquid; an insulation unit disposed on the electrode unit and a control unit controlling a voltage applied to the electrode unit, wherein the electrode unit includes a first electrode and a second electrode electromagnetically interacting with each other to change the interface, wherein the first electrode includes a plurality of electrode sectors arranged sequentially in a clockwise direction with respect to an optical axis, and wherein the control unit performs control so as to apply voltages to driving electrodes by rotation in a clockwise direction or in a counterclockwise direction.

The invention belonging to the field of the instrument design discloses a halogen lamp driving circuit of an infrared polarization therapeutic apparatus. The driving circuit is composed of an AC-DC voltage stabilization module, a DC-DC voltage stabilization module, a reference voltage circuit, a sampling circuit, a comparison circuit, and an integral circuit. According to the driving circuit, theintegral circuit is formed by cascaded connection of two-stage integral units, so that the locking speed of an amplitude stabilization loop is increased. With introduction of one group of negative power supplies, the amplitude stabilization loop of the driving circuit is easy to lock, so that the output voltage range of the driving circuit is extended substantially and the driving power of the high-power halogen lamp is enhanced; and the output voltage range is 0 to 15V and the 150-W halogen lamp can be driven with full power. The infrared polarization therapeutic apparatus designed by using the halogen lamp driving circuit is superior to the same kind of foreign instruments in terms of core indexes like the output optical power and polarization degree at a leading level.

The invention discloses an integral circuit applied to an ultraviolet focal plane detector. The integral circuit carries out linear integral amplification on a photocurrent signal of the ultraviolet focal plane detector through an integral amplifier on an integral capacitor to convert the photocurrent signal into a voltage signal. The influence of leakage current is reduced through a low leakage current structure. The initial voltage of integral output is reduced. According to the integral circuit provided by the invention, the low leakage current structure is added to a conventional structureto acquire integral voltage with higher linearity and larger output range; integral voltage with higher linearity is provided for a subsequent sampling circuit; and the output voltage range is increased.

The invention discloses a bidirectional converter. The bidirectional converter comprises an inverter circuit, a resonance circuit, a transformer and a rectification circuit, wherein the inverter circuit is a half-bridge inverter circuit and comprises two switching tubes; the two switching tubes are connected in series to form a bridge arm; the resonance circuit comprises a first capacitor, a second capacitor, a first inductor and a second inductor; one end of the first inductor is connected with the second inductor and one end of the second capacitor; one end of the first capacitor is connected with the other end of the first inductor; the other end of the first capacitor and the other end of the second capacitor are connected to the bridge arm of the inverter circuit; the other end of the second capacitor and the other end of the second inductor are connected with a primary winding of a transformer; a secondary winding of the transformer is connected with the input side of the rectification circuit; and the output side of the rectification circuit and the two ends of the bridge arm of the inversion circuit serve as the second external connection end and the first external connection end of the bidirectional converter respectively.

The invention discloses a photovoltaic grid-connected inverter and a control method thereof. The photovoltaic grid-connected inverter comprises a DC input unit, an inverter unit, a voltage detecting unit and a main control CPU. The inverter unit comprises an inverter module and a rising a voltage module, and the boosting module includes a transformer. The transformer includes an iron core, an input terminal, an input coil, an output terminal A, an output terminal B, a rotary drum A, a rotary drum B, and a threading plate. The rotary drum A and the rotary drum B are provided with conductive coils which have the same winding direction and are connected through a conductive wire. The rotary drum A is mounted on the iron core, and the conductive coil wound on the rotary drum A forms an outputcoil. The conductive wire and the output terminal B are connected with each other, and the rotary drum B drives the rotary drum A to rotate. The inverter has an output voltage range which is large enough, and is wide in application range. Moreover, the inverter employs a main control CPU for cooperating with the voltage detection, and can achieve the full-automatic control.

The invention discloses a voltage amplifier device for a space low-energy plasma detector. The voltage amplifier device for the space low-energy plasma detector comprises an amplifier control circuit,a optocoupler control circuit and a high-voltage optocoupler device which are connected in sequence, and a voltage sampling circuit which is connected with the optocoupler control circuit and the high-voltage optocoupler devices, wherein the high-voltage optocoupler device is connected between a high-voltage power supply input end and one end of a high-voltage resistor, and the other end of the high-voltage resistor is grounded; the number of the amplifier control circuit and the number of the high-voltage resistor are each one, the number of the high-voltage optocoupler devices, the number of the voltage sampling circuits and the number of the optocoupler control circuits are each at least two, the number of the high-voltage optocoupler devices is equal to the number of the optocoupler control circuits, and the number of the voltage sampling circuits is one more than the number of the high-voltage optocoupler devices. The device is small in size, light in weight, large in output voltage range, high in adjusting speed and suitable for supplying power to the electrode of the low-energy plasma detector.

An efficient bidirectional converter disclosed by the present invention comprises an inverter circuit, a resonant circuit, a transformer and a rectification circuit, the inverter circuit is a half-bridge inverter circuit, and the resonant circuit comprises a first inductor, a second inductor, a first capacitor, a second capacitor and a selection switch. The two ends of the first capacitor are connected with one end of the first inductor and one end of the second capacitor respectively, the other end of the second capacitor and one end of the second inductor are connected with the inverter circuit, the other end of the second inductor and the other end of the first inductor are connected with a primary winding of the transformer, the other end of the second inductor is connected with the first capacitor through the selective switch, so that the primary winding is connected to one end, connected with the second capacitor, of the first capacitor in a first state and connected to one end, connected with the first inductor, of the first capacitor in a second state, and a secondary winding of the transformer is connected with the input side of the rectifying circuit, and the output side of the rectifying circuit and the inverter circuit are respectively used as a second external connection end and a first external connection end of the high-efficiency bidirectional converter.