34results about How to "Reduce voltage requirements" patented technology

The present invention discloses a switching regulator including a charge pump. The switching regulator converts an input voltage to an output voltage. The switching regulator includes: a power stage circuit, which switches at least one power switch thereof according to a driving signal to convert the input voltage to the output voltage; and a control circuit, which is coupled to the power stage circuit, for generating the driving signal according to a feedback signal. The power stage circuit includes: an active circuit, which includes the power switch and at least one inductor, and is controlled by a driving signal to convert the input voltage to a middle voltage; and a passive circuit, which is coupled to the active circuit, and includes a charge pump for converting the middle voltage to the output voltage.

The invention relates to the technical field of organic chemistry and discloses a boron-containing luminescent material and its preparation method and use. The boron-containing luminescent material solves the problem that the existing luminescent materials in a solid state do not emit fluorescent light. The boron-containing luminescent material has good optical properties and aggregation-induced emission effects and can emit fluorescent light in a solid state. The preparation method has simple processes, adopts easily available raw materials and has a high yield.

The present disclosure mainly provides a clamping circuit, which is coupled to the first end and the second end of the switch tube through the first node and the second node, including: an RCD loop, including a parallel connection between the second node and the third node The first resistor and the first capacitor between them, and the diode whose cathode is coupled to the third node; the first Zener diode, whose cathode is coupled to the first node, and whose anode is coupled to the anode of the diode at the first Four nodes. The embodiments of the present disclosure can improve the clamping reliability and clamping effect, and can reduce the volume and cost of the clamping circuit.

The invention discloses a DC power supply power flow controller topology, which is composed of a first guide switch module (11), a second guide switch module (12) and a full-bridge sub module (13), wherein the first leading-out terminal of the first guide switch module (11) is connected with the first leading-out terminal of the second guide switch module (12) to serve as a first leading-out terminal (1) of the DC power supply power flow controller; the second leading-out terminal of the first guide switch module (11) is connected with the first leading-out terminal (4) of the full-bridge sub module (13), and the connection point serves as a second leading-out terminal (2) of the DC power supply power flow controller; and the second leading-out terminal of the second guide switch module (12) is connected with the second leading-out terminal (5) of the full-bridge sub module (13) to serve as a third leading-out terminal (3) of the DC power supply power flow controller.

The invention provides a control circuit, a control chip and a power supply system. The power supply system includes a control chip, the voltage at the output end of the power supply system is lower than the voltage at the input end, the control chip takes power from the output end of the power supply system, and the control circuit works according to preset logic to ensure that the control chip to work properly. Such configuration reduces the withstand voltage requirement of the control chip, lowers the manufacturing cost, and solves the problems of high withstand voltage requirement and high cost of the LED constant current drive chip in the prior art. At the same time, the power supply system also has the beneficial effects of simple structure and few peripheral components.

The invention relates to a modular satellite electric propulsion device with adjustable discharge pulse, which belongs to the field of micro-nano satellite electric propulsion. Combined with the rapid on-off of the controllable switch, the inductive energy storage and voltage boost are realized based on the fact that the inductive current cannot be mutated, so that the anode and cathode of the thruster are discharged, ionized plasma, ejected to generate thrust, and the output PWM is adjusted through the pulse control circuit The duty cycle and frequency of the rectangular wave adjust the thrust. The device is small in size and simple in supply mechanism; based on the way of inductive energy storage, it can instantly raise the low voltage of 3-27V to a plasma breakdown voltage of hundreds to more than a thousand volts, reducing the voltage demand for satellite power supply and distribution ;Effectively reduces the cost; adopts modular design, the functions can be freely combined according to the needs, the interface is compatible, combined with power supply devices of different discharge power and frequency, can form different series of thrusters; the digital adjustable pulse control circuit adopted is easy to debug , can realize the precise control of the thrust.

The invention discloses a doubly-fed wind turbine generator set low-voltage rid through control method based on inductance simulation, and belongs to the technical field of wind power generation. When a fault occurs in a power grid, rotor side converter equivalent port impedance of the doubly-fed wind turbine generator set is simulated into a pure inductance form, an inductance value is dynamically adaptively adjusted in real time according to rotor voltage and current constraints, voltage and current margins of the rotor side converter can be made full use of, a rotor voltage requirement is lowered and rotor fault current are reduced, and a controllable low-voltage ride through capability of the doubly-fed wind turbine generator set is improved. The method provided by the invention can also effectively suppress electromagnetic torque pulsation, and has the advantages of being clear and definite in physical conception, and being simple in structure.

A direct current breaker topology with a bidirectional blocking function is disclosed. The direct current breaker topology comprises a main loop module (1), a fault current blocking module (2), a first diode group (3) and a second diode group (4); the first leading-out terminal of the main loop module (1) is connected with the positive electrode of the first diode group (3), and the connecting point between the first leading-out terminal of the main loop module and the positive electrode of the first diode group is used as the first leading-out terminal (5) of the direct current breaker topology; the second leading-out terminal of the main loop module (1) is connected with the positive electrode of the second diode group (4), and the connecting point between the second leading-out terminal of the main loop module and the positive electrode of the second diode group is used as the second leading-out terminal (6) of the direct current breaker topology; the negative electrode of the first diode group (3) is connected with the negative electrode of the second diode group (4); and the second leading-out terminal of the fault current blocking module (2) is used as the third leading-out terminal (8) of the direct current breaker topology.

The invention discloses a power supply device having a power factor correction circuit, which is capable of receiving the voltage of three-phase voltage. The power supply device having the power factor correction circuit comprises three rectification modules which are respectively receiving first phase voltage, second phase voltage and third phase voltage of the three-phase voltage; each rectification module comprises a filter which is used for receiving one voltage of the three phase voltage and outputting filtering voltage, a single-phase power factor correction circuit which is coupled to the filter for receiving the filtering voltage and outputting correction voltage; and the each rectification module also comprises a main transistor, a converter, at least one power factor correction controller, and a simulation controller; the converter is coupled to the output terminal of the single-phase power factor correction circuit and is connected to the voltage output terminal; the power factor correction controller is connected to a main transistor; and the simulation controller is connected to the converter. The power supply device having a power factor correction circuit eliminates the mutual interference between the rectification modules, requires less quantity of members by comparing with the traditional three-phase parallel connection power factor correction circuit, saves the cost without influencing the result, and guarantees the quality.

The invention is suitable for the field of projection display and provides a light emergent pipe of a projection light source system. A plurality of transparent OLED (Organic Light Emitting Diode) luminous panels are laminated inside the light emergent pipe along the axial direction of the light emergent pipe. According to the invention, a plurality of transparent OLED luminous panels are laminated inside the light emergent pipe along the axial direction of the emergent pipe, so that light emitted by each OLED luminous panel can pass through the front luminous panels or pass through the front luminous panels after being reflected by the inner wall of the light emergent pipe and is finally projected onto a receiving surface. The OLED luminous panels have transparency and high brightness and visibility, and thus, when a plurality of OLED luminous panels are laminated, the light output can be increased and the transverse luminous surface also cannot be increased, so that not only the brightness of the projection light is improved, but also the lamination of the OLED luminous panels is beneficial for reducing the volume of a light source system. Moreover, OLEDs have low requirement on voltage and are easy to save electricity and the cost can be saved; and the light emergent pipe has the advantages of light weight, low thickness and simple structure and is also beneficial for reducing the weight and the volume of a projector.

A thyristor-based bidirectional DC circuit breaker topology with bidirectional blocking function, comprising a main branch module (1), a thyristor capacitor branch module (2), a first diode group (3) and a second diode Composed of tube groups (4); the first lead-out terminal of the main branch module (1) is connected to the anode of the first diode group (3), and its connection point is used as the first lead-out terminal of the DC circuit breaker topology ( 5); the second lead-out terminal of the main branch module (1) is connected to the anode of the second diode group (4), and its connection point is used as the second lead-out terminal (6) of the DC circuit breaker topology; the second The cathode of a diode group (3) is connected to the cathode of the second diode group (4), and is connected to the connection point (7) with the first lead-out terminal of the thyristor capacitor branch module (2); the thyristor capacitor The second lead-out terminal of the branch module (2) serves as the third lead-out terminal (8) of the DC circuit breaker topology.