99results about How to "Optimizing Load Regulation" patented technology

A phacoemulsification system includes a phacoemulsification handpiece including a cutting tip ultrasonically vibrated by an ultrasonic transducer. A power supply is provided for driving the ultrasonic transducer at a resonant frequency of the transducer and cutting tip and varying power to the transducer, in response to loading of the cutting tip, by phase shifting drive signals to the resonant converter which supplies power to the transducer.

Switching-mode power conversion system and method thereof. The system includes a primary winding configured to receive an input voltage, and a secondary winding coupled to the primary winding and configured to, with one or more first components, generate, at an output terminal, an output voltage and an output current. Additionally, the system includes an auxiliary winding coupled to the secondary winding and configured to, with one or more second components, generate, at a first terminal, a detected voltage. Moreover, the system includes an error amplifier configured to receive the detected voltage and a first reference voltage and generate an amplified voltage based on at least information associated with a difference between the detected voltage and the first reference voltage. Also, the system includes a compensation component configured to receive the amplified voltage and generate a second reference voltage based on at least information associated with the amplified voltage.

The invention relates to a constant-current control method of a power switch type LED drive circuit and a circuit thereof. The method comprises the following steps of: setting a reference voltage value corresponding to the constant average current value of an LED lamp group and the sustainable turn-off time T2 of a power switch; opening the power switch to acquire an induced voltage corresponding to the working current of the LED lamp group, and comparing the induced voltage and the reference voltage value; accumulating the sustainable opening time Ta of the power switch since the power switch is opened until the induced voltage reaches the reference voltage value; accumulating the sustainable opening time Tb of the power switch since the induced voltage of the LED lamp group reaches the induced voltage value, when Tb is equal to Ta, turning off the power switch; and since the power switch is turned off, timing the sustainable turn-off time of the power switch, and after the set sustainable turn-off time T2 is reached, opening the power switch. The invention realizes the direct control on average current and improves the control precision on the current.

The improved single stage power converter circuit topology substantially reduces EMI that is conducted to the AC line, reduces input AC current inrush, improves output ripples by the use of an auxiliary supply near zero crossings of the line AC voltage, provides Power Factors greater than 0.95, provides Total Harmonic Distortions less than 15%, and maintains constant power, including constant power in a non-linear output load. Further, this circuit topology provides output open and short circuit protections by reducing current stress in power components. This topology can also make the power source to appear as a fast-acting variable impedance source, an ideal source for powering an output load that has negative resistance characteristics such as gas discharge lamps.

Implemented are a switching power supply device and a light-emitting diode lighting device in which a variation in load current can be suppressed against a wide range of variation in AC voltage. The configuration of the switching power supply device and the light-emitting diode lighting device includes: a rectifier unit which rectifies AC input voltage and outputs pulsating-current voltage; a power converting unit which receives the pulsating-current voltage and supplies a predetermined load current to a load; a current detecting unit which detects the load current; a drive control unit which controls the power converting unit to regulate the load current to a constant level; and an input voltage detecting unit which detects a variation in the AC input voltage. The drive control unit controls the power converting unit depending on the variation in the AC input voltage detected by the input voltage detecting unit.

A USB power supply apparatus supplies electric power to a USB power reception apparatus. A bus line connects the output of the power supply circuit and the USB power reception apparatus. A switch is provided on a path of the bus line. A feedback circuit feedback controls the power supply circuit such that the output voltage V_OUT of the power supply circuit approaches a reference voltage V_REF. A controller adaptively controls the reference voltage V_REF based on an electrical state of the USB power supply apparatus.

The invention discloses a band-gap reference source for a digital-analog hybrid circuit. The configuration of the band-gap reference source is that a source electrode of an MOS pipe M18 and a source electrode of an MOS pipe M19 are both connected with a power supply; a gate electrode of the MOS pipe M18 and a gate electrode of the MOS pipe M19 are both connected with the output terminal of an amplifier IC; a drain electrode of the MOS pipe M18 is connected with one input terminal of the amplifier IC through a resistor R2; a drain electrode of the MOS pipe M19 is connected with the other input terminal of the amplifier IC through a resistor R3; the resistor R2 is connected to a collecting electrode of a triode Q1; the collecting electrode of the triode Q1 is connected with a base electrode of the triode Q1; an emitting electrode of the triode Q1 is earthed; the resistor R3 is connected to a collecting electrode of a triode Q2 through a resistor R4; the collecting electrode of the triode Q2 is connected with a base electrode of the triode Q2; an emitting electrode of the triode Q2 is earthed. The band-gap reference source can improve the performances in a certain aspect of reducing interference of power wires and earth wires, realizing the high rejection ratio of the power supply voltage, improving working stability, or optimizing the load regulation.

The invention relates to a hysteresis control method of a Boost convertor. Circuit output is connected with the ground through a feedback adjustment resistor and a charging capacitor, a hysteresis comparator is controlled by charging and discharging of the charging capacitor to output a high level and a low level, an output signal of the hysteresis comparator is connected with a drive circuit, output PWM signal frequency is controlled by the drive circuit according to an input signal, so that connection time and disconnection time of a switching tube of the circuit are controlled, and output load voltage is adjusted. According to the hysteresis control method of the Boost convertor, load adjusting capacity is good; an error amplifier is not used, feedback phase delay does not exist, a phase compensation circuit is completely not required, circuit design is simple, and large consumption of manpower and material resources is not needed; when load rise or load drop occurs, good dynamic adjustment can be achieved through small overshoot in short adjustment time; the requirements for input and output high-speed instant response, the small size, low cost and high efficiency of the Boost direct-current convertor are satisfied; the accurate constant frequency characteristic is achieved, the design of electromagnetic compatibility is convenient, and the problem of electromagnetic interference is not prone to generation.

The invention relates to a multi-output power, in particular to a multi-output power which can improve the load adjustment rate of an auxiliary circuit for the multi-output power, which comprises a transformer and an output circuit of a main circuit and at least one output circuit of the auxiliary circuit which are connected with a secondary line winding of the transformer; the output circuit of the main circuit and the output circuit of the auxiliary circuit are respectively in series with different windings of a transformer; a terminal of the output circuit of the main circuit which flows into the winding of the main circuit and a terminal of the output circuit of the auxiliary circuit which flows into the winding of the auxiliary circuit are dotted terminals. The invention has the advantages of no consumption, maximized adjustment rate for the output load of the auxiliary circuit, greatly improving voltage stabilized precision of the auxiliary circuit output, no requirement for regulating turns of the transformer; direct quantum chemistry calculation provided by the transformer, no effect from duty ration, extremely low cost of implementation, extremely high performance-price ratio, and improved feature of electromagnetic capability in relevant output circuits.

This invention provides one positive and negative voltage conversion circuit, which comprises the following parts: one dropping switch mode adjustor; electrolyte capacitor, diode, output memory induction, electrolyte capacity, high frequency filter capacitor, feedback resistance network, output filter induction and electrolyte capacity. This invention adopts filter induction to eliminate voltage beam wave and load ability resulted by Buck-Boost circuit and put filter induction on negative end.

A hysteretic DC-DC converter is provided with high switching frequency, good load regulations and fast load step response and in which the switching frequency is externally adjustable by a novel feedback network that enables substantial independence of duty cycle variation.

The invention discloses a ripple wave suppressor circuit of a program-controlled direct-current power supply. According to the ripple wave suppressor circuit of the program-controlled direct-current power supply, an active low-pass filter and a passive filter are connected between a positive output line of the direct-current power supply and a negative output line of the direct-current power supply after a capacitor C3 is connected between the positive output line of the direct-current power supply and the negative output line of the direct-current power supply, the active low-pass filter comprises an N-channel high-power MOSFET V1, a front-stage operational amplifier N1:1 with a dynamic compensation function and a rear-stage operational amplifier N1:2 with a dynamic compensation function, and the passive filter comprises an inductor L1 and a capacitor C1. According to the ripple wave suppressor circuit of the program-controlled direct-current power supply, high-frequency and low-frequency ripple wave noise output by the power supply can be lowered, the dynamic response performance can be improved, and the output precision and the stability are improved. The front-stage and rear-stage synchronous tracking control is adopted, accurate adjustment enabling the voltage difference to be low can be achieved, and the conversion efficiency of the power supply is effectively improved. As a result, the ripple wave suppressor circuit of the program-controlled direct-current power supply has high application value in the aspect of design of high-precision program-controlled power supplies.

The invention provides a control circuit of a high-side depressurization converting circuit. The control circuit comprises a sensor, a sensing window signal generator, an error amplifier, a first comparator, and a conduction time signal generator, wherein the sensor is used for sensing an output signal of the converting circuit so as to provide a sensing signal; the sensing window signal generator is used for generating a sensing window signal; the error amplifier is used for amplifying an error between a feedback signal and a reference signal of the sensing signal during a period of sensing a window, and outputting an error signal; the first comparator is used for comparing the error signal and the feedback signal and outputting a first comparison signal; and the conduction time signal generator is used for generating a conduction time signal according to the first comparison signal so as to control the conduction and the disconnection of upper and lower switching tubes of the converting circuit. According to the converting circuit provided by the invention, the control circuit can well regulate loads.

The automatically controlled frequency varying burning two-purpose coal water slurry and oil boiler with pre-combustor includes one boiler body and one combustor connected to the front end of the boiler body. In the front part inside the boiler body, there is one pre-combustor integrated with the boiler body. The combustor is automatic split two-purpose one capable of burning coal water slurry and oil, and includes casing, spray gun assembly, spray gun executing part, controlling valve assembly, air door mechanism, oil pump and oil pump motor. The present invention has fast ignition, stable combustion, automatic control and capability of burning both coal water slurry and oil.

The invention discloses a low-dropout linear regulator of an improved digital-analog hybrid circuit. The digital-analog hybrid circuit comprises a power circuit, an analog circuit and a digital circuit which are integrated on a PCB. The digital circuit and the analog circuit are physically isolated. An analog circuit ground and a digital circuit ground are separately arranged in different stratums. The low-dropout linear regulator comprises an error amplifying circuit, a power level output circuit and a bandwidth increasing circuit. The output end of the power level output circuit is connected to the positive-phase input end of the error amplifying circuit in a negative feedback mode. The negative-phase input end of the error amplifying circuit is connected with a reference voltage. The output end of the bandwidth increasing circuit is connected with the input end of the power level output circuit, and the bandwidth increasing circuit is used as a second level non-inverting amplifier for increasing the bandwidth of the whole negative feedback loop circuit. The low-dropout linear regulator can improve one of the functions of reducing interference between a power line and an earth wire, achieving the high supply voltage rejection ratio, improving work stability and optimizing load regulation.