30results about How to "Input current continuous" patented technology

The present invention provides an apparatus for controlling an LED string. In the apparatus, each high voltage (HV) N-type device has one end electrically connected or coupled with the corresponding LED unit and the other end coupled with a corresponding low voltage (LV) current limit switch via a corresponding path. The LV current limit switch is switched according to the voltage or current detected on the path. Since the current flowing through the HV N-type device increases or decreases with that flowing through the corresponding LV current limit switch, the HV N-type device will be indirectly controlled.

The invention relates to a voltage doubler type three-winding coupled inductance high-gain DC converter, which relates to the technical field of power electronic converters. The purpose of the present invention is to solve the problem that the current boost converter is used to achieve voltage gain, but the actual gain of the boost converter does not always increase with the increase of the duty cycle, and its boost capacity is very limited, so it is not suitable for high Problems in gain-to-dc power conversion applications. The three-winding coupled inductor winding is used in the power switch tube S 1 When turned on, the DC voltage source V in The input energy is stored and amplified through the voltage doubler structure; it is also used in the power switch tube S 1 When it is turned off, use the power switch tube S 1 The parasitic capacitance absorbs the leakage inductance energy, so that the power switch S 1 The voltage across both ends is higher than the output capacitor C o The voltage across both ends turns on the output diode D o , will amplify the energy through the output diode D o for the load R and the output capacitor C o powered by. It is used to obtain high gain voltage.

The invention relates to a zero-ripple high-gain DC-DC converter based on a novel boost unit, including a low-voltage DC power supply V in , power switch tube S, first power diode D 1 , the second power diode D 2 , the third power diode D 3 , the fourth power diode D S1 , the first coupled inductance L 1 , the second coupled inductance L 2 , the first capacitor C 1 , the second capacitor C 2 , output resistance R o and a DC-DC conversion module; the DC-DC conversion module includes a group of new boost units, i=1,...,N, and each group of new boost units includes an independent inductor L i0 , power diode D i0 ,capacitance C i1 and capacitance C i2 The converter of the present invention not only has the characteristics of zero input current ripple, low voltage stress of power devices, simple control circuit, etc., but also can achieve higher voltage output by expanding a specific number of boost units. In addition, in the case of the same output voltage, the more the number of extended boost units, the lower the voltage stress of the power device.

The invention relates to a quadratic high-gain boost converter with a continuous input current, comprising an input boost module, a voltage conversion module and a rectifier filter output module, specifically comprising a first switching tube S1, a second switching tube S2, a first inductance L1, a second inductance L2 or transformer T, a first diode D1, a second diode D2, a first capacitor C1 anda second capacitor C2, and comprising a non-isolated topological structure or an isolated topological structure. The quadratic high-gain boost converter provided by the invention can realize non-isolated boost of an output voltage and also can realize isolated boost of the output voltage, thereby being applicable to an occasion that a high voltage needs to be output in a boost mode.

The invention discloses a double-pipe Z-source direct-current voltage converter. The converter comprises a voltage source, an inductor, a capacitor, a first switch tube, a second switch tube, a first diode, a second diode and a load. The positive electrode of the voltage source is connected with one end of the inductor, and the negative electrode is connected with the source electrode of the first switch tube and the cathode of the first diode. The drain electrode of the first switch tube is connected with the cathode of the second diode, the positive electrode of the capacitor and one end of the load. The drain electrode of the second switch tube is connected with the anode of the first diode, the negative electrode of the capacitor and the other end of the load. The converter is simple in structure and convenient to control, input current is continuous, quite high output voltage gain under the low duty ratio can be achieved and the circuit is free from a start impacting problem.

The invention discloses a high-gain voltage type quasi-Y source direct current-direct current converter. A Y source network and a Boost impedance network are combined, the voltage gain of a circuit isflexibly determined through a three-winding transformer in the Y source network, and higher boosting can be achieved under the same duty ratio. Therefore, the problem that the traditional Boost converter can only obtain higher output voltage by increasing the duty ratio, however, the current peak values of the output diode and a switching tube are increased, the conduction loss and the capacitance impact are increased, the conversion efficiency of the circuit is low, and the service life of the circuit is short is solved, so that the converter has the advantages of high conversion efficiencyand high voltage gain, and the circuit structure is simple and reliable.

The invention discloses an inverter with continuous and adjustable output, comprising a BOOST converting circuit and a PWM controller. The first input end of the PWM controller is connected to the sampling end of the output voltage sampling circuit of the inverter, and the second input end of the PWM controller is a control end; the output signal of the PWM controller is used to control the switching tube in the BOOST converting circuit to make or break; a constant-voltage circuit is arranged at the output end of the BOOST converting circuit by serial connection, and the output of the constant-voltage circuit is taken as the output voltage of the convertor; the constant-voltage circuit is used to produce voltage difference; under a proper input voltage condition, the BOOST converter achieves the functions of a BUCK-BOOST circuit by constant-voltage circuit compensation. The invention has the advantages of a simple and reliable circuit, low electromagnetic interference and low cost; inaddition, linear-relation variation is achieved between the output voltage and the control voltage.

The invention discloses a single-phase single-stage boost inverter and a control method thereof. The inverter includes a switch tube S 1 ~S 6 , DC bus capacitor C dc , input power U in , the first boost inductor L 1 , the second boost inductor L 2 , filter capacitor C f , filter inductance L f . Compared with the traditional interleaved parallel Boost+VSI two-stage scheme, the present invention not only doubles the equivalent switching frequency of the system, reduces the input current ripple rate, thereby reducing the size of the required filter device, but also The use of two power diodes is reduced, and the boost and inverter control are realized at the same time through only one stage of power conversion, which makes the system have higher integration and system efficiency. In addition, it has continuous input current, simple structure, and low cost. Advantages, and has the ability to suppress the common mode current. Therefore, the present invention is particularly suitable for large-power distributed grid-connected power generation systems.

The invention belongs to DC-DC step-up conversion technology, in particular to a double-input inductance soft-switching high-gain converter and a control method thereof, wherein the positive pole of the input power supply is connected to one end of the first inductance, one end of the second inductance, and an input filter Capacitance C in The positive pole of the input power supply is connected to the source of the first switching tube, the source of the second switching tube, the negative pole of the first capacitor, the drain of the third switching tube, and the input filter capacitor C in The drain of the first switching tube is connected to the other end of the first inductor and the anode of the first diode; the drain of the second switching tube is connected to the other end of the second inductor and the positive electrode of the second capacitor; The cathode of the first diode is connected to the positive pole of the first capacitor and one end of the output filter inductor; the negative pole of the second capacitor is connected to the source of the third switching tube, the negative pole of the output filter capacitor, and one end of the DC load; the output filter inductor The other end of the capacitor is connected to the positive pole of the output filter capacitor and the other end of the DC load.

The invention discloses a quasi-Z source DC-DC converter mixed with active switched capacitors and passive switched inductors, which includes a voltage source, a first inductor, and is composed of a first diode, a first MOS transistor, and a first capacitor. The active switched capacitor unit, the passive switched inductor unit composed of the second diode, the third diode and the second inductor, an output MOS tube, an output diode, an output filter capacitor and an output load. The invention combines the high-gain characteristics of the quasi-Z source, the characteristics of the active switch capacitor and the passive switch inductance, and compared with the 3-Z source network step-up DC-DC converter, the number of inductances is two less, the number of capacitors is the same, and the number of diodes is the same. 5 less, one more MOS transistor, but the voltage gain is significantly improved; compared with the scalable diode-assisted Z-source step-up DC-DC converter (first-stage expansion), the voltage gain is the same, and the number of inductors and capacitors are respectively reduced One and two, the number of diodes is the same, and the number of MOS transistors is one more, so that a higher output voltage gain is achieved with a lower duty cycle.