289results about How to "High voltage gain" patented technology

A bidirectional converter circuit includes a voltage source which provides an input voltage, an energy storage set connected to the voltage source and receives the input voltage, a switch set connected to the energy storage set, wherein the switch set includes a first switch and a second switch; an operating switch set connected to the switch set, wherein the operating switch set includes a first operating switch, a second operating switch, a third operating switch and a fourth operating switch. The bidirectional converter further includes a blocking capacitor set and a (input/output) capacitor set. Wherein, the blocking capacitor set is connected to the switch set and the operating switch set. The first operating switch and the second operating switch are driven complementarily with the first switch, and the third operating switch and the fourth operating switch are driven complementarily with the second switch.

The invention discloses a single switching tube high-grain converter based on a coupling inductance voltage-multiplying unit. The first end of a coupling inductance primary winding is connected with an anode of an input power supply and the first end of a voltage-multiplying capacitor; the first end of a coupling inductance secondary winding is connected with the second end of the voltage-multiplying capacitor; the second end of the coupling inductance primary winding is connected with a drain electrode of a switching tube, an anode of a first follow current diode and the first end of a switching capacitor; the second end of a coupling inductance secondary winding is connected with a cathode of the first follow current diode and an anode of a second follow current diode; an anode of the output diode is connected with a cathode of the second follow current diode and the second end of the switching capacitor; the cathode of the output diode is respectively connected with the first end of the output capacitor and the first end of an output load; and the first end of the coupling inductance primary winding and the second end of the coupling inductance secondary winding are dotted terminals. According to the single switching tube high-grain converter disclosed by the invention, the turn-off voltage peak is inhibited; leakage inductance is recovered; and the grain of energy voltage is high.

The present invention discloses a low noise amplifier circuit adopting multiplex noise counteract, wherein the low noise amplifier includes a DC connected Balanced to Unbalanced transformer (Balun), a pair of cross coupling connected input transistor with source electrode respectively direct connected to two balancing ends of the Balanced to Unbalanced transformer and the grid respectively AC coupled connected to two balancing ends that different with Balanced to Unbalanced transformer; a pair of transistor load with the grid respectively AC coupled connected to two balancing ends of the Balanced to Unbalanced transformer, and two pairs of electric resistance-capacitance (R-C) high-pass filter network forms cross coupling configuration by connecting the input transistor, two pairs of electric resistance-capacitance high-pass filter network AC couples the input signal to grid of the transistor load tube. The main purpose of the present invention is to realize low noise coefficient and high linearity through multiplex noise counteract technology only consuming low power consumption at the same time.

A boost-forward-flyback convertor has a boost converting circuit, a forward converting circuit, a flyback converting circuit and a transformer. The boost converting circuit, the forward converting circuit and the flyback converting circuit are coupled by using elements of the boost and forward converting circuits to form the transformer. The boost-forward-flyback convertor combines benefits of conventional boost, forward and flyback convertors, specifically combines active clamping and lower power pressure to the element from the boost convertor, increases gain ratio by using the forward convertor and provides output to the load during a switch OFF-state from the combination of the flyback and boost converting circuit. The boost-forward-flyback convertor combines benefits of conventional boost, forward and flyback convertors and not only has very high gain, high converting efficiency and lower power loading for devices, but also is simple, cost less, easy to use and has a small volume.

The invention discloses a zero-input current ripple high-gain converter based on double coupling inductors and a single switch. The converter includes a direct current input power supply Vin, coupling inductors T1 and T2, freewheel diodes D1, D2 and D4, an energy storage capacitor C1, a power switch tube Q, a clamping diode D3, voltage-multiplying energy storage capacitors C2, C3 and C4, an output diode D0 and an output capacitor C0. The converter can obtain a high gain of voltage by means of the coupling inductors, the gain is controlled by a duty ratio and a coupling inductance turn ratio and is wide in adjustable range, and voltage and current stress of the switch tube is small; through coupling of an input inductor and an energy storage inductor, and reasonable configuration of a coupling coefficient, input current zero ripples can be realized; a lossless absorption circuit formed by the clamping diode and the energy storage capacitor can reduce voltage spikes of the switch tube; and the freewheel diodes, the voltage-multiplying energy storage capacitors and secondary sides of the coupling inductors form an energy recovery circuit, so that leakage inductance energy is finally fed back to a load side, thereby improving the efficiency of the converter.

The invention relates to a low-temperature drift detuning self-calibration operational amplifier circuit and a design method of the low-temperature drift detuning self-calibration operational amplifier circuit. The low-temperature drift detuning self-calibration operational amplifier circuit comprises two gain units, a biased module, three capacitors, a current source, six switches, four P-type metal oxide semiconductor (MOS) pipes and five N-type MOS pipes, wherein each gain unit comprises a capacitor, two resistors, a switch, ten P-type MOS pipes and four N-type MOS pipes. A folded cascade structure is adopted to be used as a gain stage of an amplifier so that high voltage gain and a high power supply rejection ratio can be obtained. Due to the fact that the MOS capacitor is adopted to store, operate and amplify detuning information caused by technology variation, and the detuning information is successively and automatically calibrated when a closed loop is used, low direct current detuning is achieved. A lower temperature coefficient is achieved by adoption of a temperature compensation technology. A high drive capability is obtained by adoption of push-pull output of an AB class.

The invention provides a single-phase high-gain boost converter. The single-phase high-gain boost converter mainly comprises a voltage transfer circuit, a coupling inductance booster circuit and an output circuit, wherein the voltage transfer circuit, the coupling inductance booster circuit and the output circuit are connected in sequence. The voltage transfer circuit comprises a first inductor, a switching tube and a first capacitor. The coupling inductance booster circuit comprises a primary winding and a secondary winding which are coupled with the inductor, a second capacitor, a third capacitor, a first diode and a second diode. The output circuit comprises a third diode, a fourth capacitor and a load. The single-phase high-gain boost converter is simple in structure and high in output voltage gain.

A Sallen-Key filter requires an operational amplifier with a large input impedance and a small output impedance to meet the external filter characteristics. The operational amplifier requires an internal feedback path for stability that limits performance. This invention eliminates the need for internal feedback and increases the gain of a source follower which has characteristics matching the operational amplifier in the Sallen-Key filter. The source follower provides 6 dB of AC voltage gain and is substituted for the operational amplifier in the Sallen-Key filter. The Sallen-Key filter requires a differential configuration to generate all the required signals with their compliments and uses these signals in a feed forward path. Furthermore, since the source follower uses only two n-channel stacked devices, the headroom voltage is maximized to several hundred millivolts for a 1.2V voltage supply in a 40 nm CMOS technology. Thus, the required 880 MHz bandwidth of the Sallen-Key filter can be easily met using the innovative source follower.

The invention relates to a voltage-multiplying DC converter based on a charge pump capacitor. The voltage-multiplying DC converter comprises an input power supply, a main switch loop, a freewheel diode, an output capacitor and a load, wherein the input power supply is connected with the input end of the main switch loop; and the freewheel diode is connected with the output end of the main switch loop after serially connecting the output capacitor. The main switch loop includes an input diode, a first inductor, a second inductor, a charge pump capacitor, a first main switch and a second switch, wherein one end of the first main switch is respectively connected with the negative electrode of the input power supply and the output capacitor, and the other end is respectively connected with the first inductor, the charge pump capacitor and the second main switch; the first inductor is respectively connected with the positive electrode of the input power supply and the anode of the input diode; the charge pump capacitor is respectively connected with the cathode of the input diode and the second inductor; and the second main switch is respectively connected with the second inductor and the freewheel diode. In comparison with the prior art, the voltage-multiplying DC converter provided by the invention has the advantages of improved voltage gain, less conduction loss, low cost, simple circuit structure and so on.

The invention relates to a topological structure of a two-way DC/DC converter and a converter. The topological structure comprises an input end, an output end, inductors L1 and L2, coupling inductors LP, LO and LS, diodes D1, D2, D3 and D3X, field effect transistors S1, S2, S3 and S4 and capacitors C1 and C2, wherein one end of the L2 and the homonymous end of the LP are connected with the anode of the input end, the other end of the L2 is connected with the cathode of the D2 and the source electrode of the S2, the heteronymous end of the LP is connected with the homonymous end of the LO, the anode of the D1 and the drain electrode of the S1, the heteronymous end of the LO is connected with the homonymous end of the LS and the drain electrode of the S4, the heteronymous end of the LS is connected with one end of the C2, the other end of the C2 is connected with the drain electrode of the S2, the cathode of the D3 and the source electrode of the S3, the cathode of the D1 is connected with one end of the C1 and one end of the L1, the other end of the L1 is connected with the anode of the D3 and the cathode of the D3X, the anode of the D3X, the other end of the C1, the source electrode of the S1, the source electrode of the S4 and the anode of the D2 are connected with the cathode of the input end, the drain electrode of the S3 is connected with the anode of the output end, and the cathode of the output end is connected with the anode of the D3X. At a BOOST state, the invention has higher gain, the capacitor has higher energy storage density, and the system has strong reliability.

The invention relates to the independent photovoltaic power generation technology, and simultaneously realizes the functions of large-scale boosting, three-port grounding and storage battery charging.Furthermore, the invention provides a control strategy corresponding to a converter, wherein a TPC can be safely and reliably applied to an independent photovoltaic power generation system. Accordingto the technical scheme adopted by the invention, a three-port converter system applied to an independent photovoltaic power generation occasion comprises three parts: a buck-boost bidirectional DC converter, a boost DC converter and a switch capacitor unit. In the buck-boost bidirectional DC converter, a Vpv and an ipv serve as the port voltage and the port current of a photovoltaic array respectively. The output of the photovoltaic array is applied to the parallel voltage-stabilized capacitor Cpv of the photovoltaic array as the input of the three-port converter. S1 and S2 are switching tubes which are connected in series. The system is is mainly applied to independent photovoltaic power generation occasions.

Disclosed herein is an apparatus for receiving a wide-band pulse signal in a communication channel using a human body. When a weak wide-band pulse signal, which is output from a communication channel using a human body as a data transmission medium, is restored to a digital signal, it is possible to accomplish low power consumption and high data transmission rate using a wide-band symmetrical triggering technology using 50-Ω impedance matching, wide-band amplification and symmetrical threshold voltages. In addition, since only a single signal electrode is used, it is possible to provide an apparatus having usability, wearability and miniaturization. In addition, it is possible to remove necessities of an external reference voltage to reduce area consumption and to simply adjust a feedback resistor to easily adjust the reception sensitivity according to a communication distance.

The invention provides a multilevel inverter based on a bridge modular switched capacitor. The multilevel inverter comprises a bridge modular multilevel switched capacitor module and an inverting module. During running of a system, the bridge modular multilevel switched capacitor module performs a conversion process of output voltage U, 2U, 4U and U through DC-DC conversion and performs DC-AC conversion through the inverting module. The multilevel inverter allows DC-DC conversion to be performed under high efficiency, high power density and high-voltage conversion ratio, a unipolar multi-frequency SPWM (sinusoidal PWM) method in the DC-AC conversion is optimized, the number of switch tubes is less than that of the traditional multilevel inverter module, and high-quality output waveform and low-harmonic content are achieved.