31results about How to "With soft start function" patented technology

The invention provides a switching power source having a stable negative voltage output. The switching power source is characterized by comprising a switching power source controller having a soft start circuit, an output stage including a coil, a switching element for controlling an electric current to flow through the coil by driving the coil with the switching power source controller, and a diode having its anode side connected with the output end and its cathode side connected with the node between the switching element and the coil, a voltage dividing circuit for dividing the output voltage of the soft start circuit and the voltage of the output end, and a soft start period adjusting circuit for adjusting the soft start period.

The invention provides a fast response loop compensation circuit, a loop compensation chip and a switching power supply. The fast response loop compensation circuit includes a variable output slew rate differential amplifier, a dynamic current sensing operational amplifier, a resistor R1, a resistor R2 and a capacitor C C . When the input voltage of the variable output slew rate differential amplifier is in the small signal range, the current fed back by the dynamic current sensing operational amplifier is zero or very small, and the output slew rate of the variable output slew rate differential amplifier is not changed. When the variable output slew rate differential amplifier is outside the small signal range, the dynamic current sensing operational amplifier outputs a dynamic response current to the variable output slew rate differential amplifier, increasing its slew rate and reducing the output impedance. The present invention realizes the normalization of the loops of switching power supplies of different specifications without sacrificing the loop stability and dynamic performance, and saves manpower and material resources required for loop debugging. Reduce stress and avoid output voltage overshoot during switching power supply startup.

The invention discloses a COT-based power supply management chip controlling a two-phase Buck circuit with a current equalizing function, which is provided with a power supply input pin, an output voltage pin, a ground pin, and two switch SW pins. Chip internal reference circuit module, comparator module, voltage loop module, clock generation module, control logic and soft start module, constant on-time generation module, ripple compensation module, current sampling module, current balance module, drive module and four On-chip switch tube. The power management chip of the present invention can efficiently overcome a variety of asymmetrical factors to achieve current balance, has high precision, can work at a high switching frequency, and has less energy loss compared with the traditional method of digital control matching duty cycle. Occupies less area.

The invention discloses a capacitor charge pump, which comprises a booster loop consisting of flying capacitors and a switch, wherein the booster loop has a input end, an output end and a grounding end. The capacitor charge pump is characterized in that: the booster loop comprises a first flying capacitor, a second flying capacitor, a third flying capacitor and a switching program; and after the input end of the booster loop is connected with an input voltage, the flying capacitors and the switch circularly operate according to a four-step switching program, and an output voltage is 1.2 times that the input voltage is obtained at the output end. The booster loop of the 1.2-time boosting capacitor charge pump is simple and only needs three flying capacitor, and when the capacitor charge pump is used in light emitting diode backlight drive, the efficiency of the capacitor charge pump is high.

The invention discloses a digital program-control constant current source, and belongs to the technical field of electronic equipment. The digital program-control constant current source structurally comprises an output module (9) and a front panel (11), and is characterized by further structurally comprising a single chip microcomputer module (1), a display module (2), an indicator lamp module (3), a key module (4), an encoder module (5), a program control (PC) module (6), a soft starting module (7), a digital-to-analog conversion module (8) and a sampling monitoring module (10). The digital program-control constant current source is based on single chip microcomputer control, and has the advantages of being rich in function, convenient to upgrade, capable of achieving program control and the like; in addition, the digital program-control constant current source has the functions of over-temperature alarming, low-pressure alarming, soft starting and the like, and is high in safety and wide in application range.

The invention relates to a soft starting switch circuit and an electronic apparatus. The soft starting switch circuit comprises an input end, an output end, a first transistor, a second transistor, a third transistor, a charge energy storage unit, a first resistor and a second resistor. When the input voltage received on the input end changes into high potential from low potential, the second transistor is connected to provide a charging path so that the charge energy storage unit can store electric energy. The voltage on the control end of the first transistor gradually decreases, so that the first transistor is connected gradually to send the input voltage of the input end to the output end to serve as output voltage. When the input voltage received on the input end changes into low potential from high potential, the third transistor is connected to provide a discharging path so that the charge energy storage unit can release the stored electric energy.

The invention discloses a multistage intelligent charging method which is suitable for rechargeable batteries. The multistage intelligent charging method comprises a diagnosis step of detecting the voltage of a battery, a soft starting step of enabling charging current to slowly rise from low to high, steps of performing charging under constant current I, charging under constant current II, charging under constant current III, charging under constant voltage, full charging and recharging, and steps of performing pulse devulcanization, precharging and high-voltage restoration. The multistage intelligent charging method has the precharging function and the soft starting function, so that damage, caused by high current, to the normal battery can be alleviated, and the service life of the battery can be prolonged; due to the devulcanization function, the capacity of a battery which is severely vulcanized can be improved; by virtue of the restoration function, the capacity of an aged battery can be recovered.

The invention discloses a half hydraulic coupler. The half hydraulic coupler comprises an outer shell, an input shaft, an output shaft, an outer rotor and an inner rotor, wherein the outer end of the input shaft and the outer end of the output shaft extend outside the outer shell, the outer rotor is installed in the outer shell and fixedly connected with the output shaft, and the inner rotor is sleeved with the outer rotor and fixedly connected with the input shaft; the inner wall of the outer rotor is a round reducing hook face which is equally divided into a plurality of equally-divided hook face bodies, the reducing size and the direction of the equally-divided hook face bodies are the same, a plurality of movable tooth grooves are formed in the outer wall of the inner rotor, movable teeth are embedded into the corresponding movable tooth grooves in a one-to-one manner, the bottoms of the movable tooth grooves are communicated with a high-pressure oil inlet, and outer ends of the movable teeth face the hook face of the outer rotor. The half hydraulic coupler has the beneficial effects of being wide in speed regulating scope, high in efficiency, small in size and small in weight; the rotating-speed difference is avoided during full-power output power, and meanwhile the soft starting function and outer load impact isolation performance are achieved; as the working efficiency of the half hydraulic coupler is high, the heating amount during working is less, and the half hydraulic coupler has the beneficial effect of being small in number of additional device, high in reliability, low in cost and the like.

A switching power converting apparatus includes a voltage conversion module, a detecting unit, and a switching signal generating unit. The voltage conversion module converts an input voltage into an output voltage associated with a secondary side current, which flows through a secondary winding of a transformer and is generated based on a switching signal. The detecting unit generates a detecting signal based on the output voltage and a predetermined reference voltage. The switching signal generating unit generates the switching signal based on the detecting signal and an adjusting signal so that the secondary side current is gradually increased during a start period of the switching power converting apparatus.