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

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 Vout generated at the gate terminal of the MOS transistor is detected in accordance with a current Ip which is generated at the photoelectric conversion element. The voltage Vout 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.

The present invention relates to a driving power supply, in particular to a multi-level switching linear composite piezoelectric ceramic driving power supply, and belongs to the field of piezoelectric ceramic driving. The multi-level switching linear composite piezoelectric ceramic driving power supply comprises a control circuit module, a rectifying and inverting module, a multi-level series connection module and an amplification output module. On the basis of ensuring sufficiently fast frequency response, the multi-level switching linear composite piezoelectric ceramic driving power supply provided by the present invention simultaneously realizes a high range, high linearity and high efficiency of an output voltage, wherein the high range of the output voltage is realized by adopting a multi-level series circuit, the high linearity of the output voltage is realized by adopting a linear push-pull circuit, and the high-efficiency output of the whole piezoelectric ceramic driving power supply is realized by adopting two push-pull circuits which keep dynamic voltages with small voltage difference to supply power to the amplification output module.

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 discloses a Z-source matrix rectifier and a vector modulation method thereof, and belongs to the technical field of a rectifier, for solving the problems that output DC voltage of a conventional matrix rectifier is smaller than input line voltage and an open circuit at an input side affects circuit reliability. The input end of an input filter of the rectifier is connected with a three-phase power source, the output end of the input filter is connected with the input end of the matrix rectifier, the output end of the matrix rectifier is connected with the input end of a Z-source network, the output end of the Z-source network is connected with the input end of an output filter, and the output end of the output filter outputs voltages for supplying power to a load. According to the method, through determining an instantaneous value and a zero-crossing point of three-phase voltages, a sector is determined, under the condition that unit power factors of voltages and currents at the input side are guaranteed, an input reference current vector is determined, and the duty ratio value of the corresponding vector is obtained through a calculation formula, such that a vector modulation strategy is realized. The Z-source matrix rectifier and the vector modulation method thereof are applied to a rectifier and modulation of the rectifier.

A resonant control device and a resonant control method thereof controls a resonant converter connected with a load. An output voltage is applied across the load. Firstly, a setting voltage is used to perform voltage compensation on the output voltage to generate a control value. Then, pulse modulation signals are generated according to the control value and a switch value, so as to drive the resonant converter to regulate the output voltage. Each pulse modulation signal has the maximum frequency and the minimum frequency. The switch value is equal to the minimum frequency divided by the maximum frequency and less than 0.5. Finally, the process determines whether the control value is less than the switch value. If the answer is yes, PWM signals as the pulse modulation signals are generated, and their frequency is less than the maximum frequency to increase a lower-limit range of the output voltage.

The invention discloses a flyback boosting circuit which comprises a transformer, a switch module, a driving module and an output diode, wherein the transformer is provided with n primary coils and a secondary coil; the switch module is provided with n switch elements; the dotted terminals of the n primary coils are respectively connected with the n switch elements in a one-to-one correspondence manner; the other end of each primary coil is connected with input voltage; the dotted terminal of the secondary coil is connected to the positive end of the output diode, and the other end of the secondary coil is grounded; an output capacitor is connected between the negative end of the output diode and the ground; the driving module supplies control signals to the n switch elements respectively to control the n switch elements to be sequentially switched on one by one within the time that the duty ratio is D; the sum of the duty ratios of the n switch elements is D, and n is an integer larger than or equal to 2. The invention also provides an LED (light emitting diode) backlight driving circuit comprising the flyback boosting circuit and a liquid crystal display comprising the backlight driving circuit.

The invention discloses a high-frequency isolation bidirectional converter. The high-frequency isolation bidirectional converter comprises an inverter circuit, a resonance circuit, a transformer and a rectifying circuit, wherein 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 with 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 rectifying circuit; and the output side of the rectifying circuit and the input side of the inverter circuit are respectively used as the second external connection end and the first external connection end of the high-frequency isolation bidirectional converter.

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 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 three-phase Cuk voltage rising and reducing three-electric level inverter. The circuit mode comprises a DC bus, switch tubes, diodes, inductors and capacitors. The inverter can be applied to a voltage rising and reducing occasion under the condition that a transformer or a forestage DC converter is not needed, is small in size, high in efficiency and low in cost, can realize that output voltage amplitude value is greater or smaller than input voltage amplitude value, is large in output voltage range, and high in utilization ratio of maximal DC voltage, requires DC bus with low voltage under the condition that requirements of same three-phase loading or three-phase grid are met, and has common mode inhibiting ability; the voltage stress of switch tubes is half of that of conventional voltage rising and reducing inverters of three-phase Cuk inverters, and the like; the inverter is more suitable for being applied to middle-high voltage occasions.

The invention discloses an integrating circuit applied to an ultraviolet focal plane detector. The integrating circuit converts the photocurrent signal of the ultraviolet focal plane detector into a voltage signal by performing linear integral amplification on an integrating capacitor through an integrating amplifier, and passes the low The leakage current structure reduces the influence of the leakage current and reduces the initial voltage of the integral output; the integration circuit of the present invention adds a low leakage current structure to the traditional structure to obtain an integral voltage with higher linearity and a larger output range, which is a good source for subsequent sampling. The circuit provides an integrated voltage with higher linearity and increases the output voltage range.

An electrical vehicle charging device includes a power converter for receiving an AC voltage from an AC grid or a DC voltage from a DC grid, a transformer having a primary side connected to an output side, a full wave rectifier having a first input and a secondary input and a positive output and a negative output, at least two output capacitors connected between respective end taps of end taps connected in series via a center tap and between the positive output and the negative output, whereby the end taps are for providing the DC voltage to the electrical vehicle, and a switch connected in series between the first input or the secondary input and the center tap, and whereby the electrical vehicle charging device is adapted for closing and / or opening the switch depending on a DC voltage level required for charging the electrical vehicle.

A power supply circuit includes a first transistor and a second transistor electrically coupled between a power supply terminal and an output terminal. When a first current path, in which output terminal through the first transistor, is formed, a voltage level of the output terminal may be controlled to be greater than or equal to a predetermined level. When a second current path, in which a current flows from the power supply terminal to the output terminal through the second transistor, is formed, the voltage level of the output terminal may be controlled to be less than or equal to the predetermined level.