51results about How to "Extended output voltage range" patented technology

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 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.