8results about How to "Small ripple" patented technology

The invention provides a high-power high-reliability voltage retainer used for an automobile starting and stopping system. The high-power high-reliability voltage retainer is higher in power and reliability and smaller in size and ripple. The high-power high-reliability voltage retainer comprises a through circuit module (1), a booster circuit module (2), a reversed polarity circuit module (3), a CAN transceiver (4), a CPU (5), a DSP (digital signal processor) (6) and a battery. A battery input port and a battery output port are formed in the through circuit module (1), a battery input port and a battery output port are formed in the booster circuit module (2), and the reversed polarity circuit module (3) is electrically connected with the booster circuit module (2); the CAN transceiver (4), the CPU (5) and the DSP (6) are sequentially and electrically connected; the CPU (5) is electrically connected with the through circuit module (1), and the DSP (6) is electrically connected with the through circuit module (1); the DSP (6) is electrically connected with the booster circuit module (2).

The application relates to the technical field of LED circuit, in particular to a lamp color adjusting circuit with a thyristor light modulation module, which comprises a rectifier circuit, a multi-grade dial code color adjusting circuit, a frequency flash removing circuit, a thyristor current discharge circuit and a constant current light modulation circuit. The rectifier circuit converts an alternating current power supply into a direct current voltage to supply power to a circuit system. The multi-grade dial code color adjusting circuit adjusts the current distribution of LED lamp beads through a dial code switch and a second group of resistors, generates a color adjusting signal, carries out low-pass filtering and dynamic compensation on the color adjusting signal, and outputs a pure control signal to the thyristor current discharge circuit. The thyristor current discharge circuit adjusts a current path according to the control signal to provide a smooth and adaptive power supply for the constant current light modulation circuit. The constant current light modulation circuit realizes constant current output. The design significantly reduces the hardware cost and the complexity of the circuit system, effectively suppresses electromagnetic interference in combination with the low-frequency modulation characteristics of the thyristor, and realizes the balance between light modulation precision and the stability of the circuit system.

The present application belongs to the technical field of power supply and distribution. A parallel three-level inverter modulation method, system, product, medium and equipment are proposed, which equivalent double parallel three-level inverters as a whole five-level inverter, inject zero sequence components to the initial three-phase reference signal to obtain the reference signal, identify the resultant vector through rounding and remainder operation, and then adjust the reference signal according to the sum of the three-phase state of the initial resultant vector to output a five-segment switching sequence, and then decompose the equivalent five-level reference signal into two sets of three-level reference signals, allocate the reference signals by dividing the half-carrier period and compare them with the triangular carrier to obtain a three-level vector sequence combination. The present application realizes the comprehensive optimization of common-mode voltage, zero-sequence circulating current and output current ripple, avoids complex sector judgment and duty cycle calculation, and reduces the implementation complexity and computational burden.

This disclosure relates to the technical field of AC power input to DC power output conversion, specifically providing a totem-pole power factor correction circuit, a power supply system, a compressor, and an air conditioning device. The totem-pole power factor correction circuit includes a rectifier module, an inductor module, a capacitor module, a switch module, and a control module. The capacitor module is connected in parallel with the output of the rectifier module. The capacitor module includes a series branch and a parallel branch. The series branch includes a first capacitor and a second capacitor connected in series, and the parallel branch includes at least one third capacitor connected in parallel across the two ends of the series branch. This disclosure, by using a parallel third capacitor, effectively suppresses bus voltage ripple, fundamentally enhancing the stability and reliability of the circuit under dynamic load changes. It solves the industry pain point of DC bus ripple in totem-pole PFC circuits, achieving a balance of "high efficiency, low ripple, and low cost."

This utility model provides a three-phase interleaved LLC circuit and power electronic device, belonging to the field of power electronics technology. The three-phase interleaved LLC circuit includes: a primary unit, an A-phase resonant transformer, a B-phase resonant transformer, a C-phase resonant transformer, and at least two rectifier units. The A-phase, B-phase, and C-phase resonant transformers all have the same number of secondary windings, and at least two, corresponding one-to-one with each rectifier unit. Part of the secondary windings of each resonant transformer are connected to the rectifier units via terminals of the same name, while other terminals are connected via terminals of different names, effectively reducing output ripple and simplifying wiring.

The application discloses a double-tube flyback switching power supply, and relates to the technical field of switching power supplies, which comprises an input rectification filter circuit, a main control circuit, a switching tube circuit, a flyback transformer circuit and an output rectification filter circuit which are sequentially connected, and a feedback circuit is further connected between the flyback transformer circuit and the main control circuit; the switching tube circuit comprises a transistor Q1 and a transistor Q2; the transistor Q1 and the transistor Q2 constitute a double-tube flyback circuit, and both the transistor Q1 and the transistor Q2 are SiC MOSFETs; the output rectification filter circuit comprises a transistor Q3 and a synchronous rectification control chip U3; the transistor Q3 is a SiC MOSFET; and the synchronous rectification control chip U3 adopts a synchronous rectification circuit structure to rectify the power supply output by the flyback transformer. The application adopts the high-temperature-resistant SiC MOSFET switching device and the double-tube flyback structure, improves the power supply efficiency and reliability under the premise of taking into account the high-temperature-resistant performance.

A novel tapless resonant push-pull photovoltaic energy storage inverter topology is disclosed, relating to the field of energy storage system topology control technology, specifically a novel tapless resonant push-pull photovoltaic energy storage inverter topology. It includes a photovoltaic boost MPPT circuit, a DC-AC bidirectional inverter circuit, and a battery-side DC-DC tapless resonant push-pull bidirectional isolated charging circuit. The photovoltaic boost MPPT circuit is used to increase the DC voltage of the photovoltaic panels and perform maximum power point tracking control. The DC-AC bidirectional inverter circuit performs bidirectional DC-to-AC conversion through three independent T-type three-level circuits, each independently controlled, with low harmonic output current. The battery-side DC-DC tapless resonant push-pull bidirectional isolated charging circuit includes a tapless transformer and a push-pull circuit. Through innovative tapless resonant push-pull circuit, dual-transformer interleaved control technology, and three-level inverter circuit design, it achieves efficient power conversion, optimized battery charge and discharge management, and reduced high-frequency ripple and electromagnetic interference, thereby improving the overall efficiency, stability, and reliability of the photovoltaic energy storage system.

This application provides a step-down circuit, chip, and electronic device. By setting a light load detection module, which is used to compare the load current with a preset threshold current, a valid detection signal is generated when the load current is less than the preset threshold current. This allows the current detection unit to increase the on-resistance of the current detection unit according to the valid detection signal, which is equivalent to the load current increasing, thereby reducing the ripple of the step-down circuit under light load conditions.