43results about How to "Improve load regulation" patented technology

The invention discloses a high-voltage power supply circuit which is suitable for low-current output and is wide in input voltage range and high in load regulation rate. The output stability of a high-voltage power supply can be improved. An input filter circuit and a Buck current feed push-pull power convertor circuit conduct filtering on input voltage and then convert the input voltage into alternating-current pulse voltage which is constant in amplitude value and is with set frequency and duty ratio of a set value. An amplitude eliminating circuit performs amplitude elimination on the alternating-current pulse voltage output by the power convertor circuit. A Cockcroft-Walton voltage-multiplying rectifying-filtering circuit rectifies the alternating-current pulse voltage subjected to amplitude elimination into high voltage output. A voltage stabilizing circuit acquires and feeds back the high voltage output of the Cockcroft-Walton voltage-multiplying rectifying-filtering circuit to the control circuit. The control circuit produces a control signal for controlling the amplitude eliminating degree according a feedback result.

The invention provides a converter feedback control circuit and a converter comprising the converter feedback control circuit. The feedback control circuit comprises n sub-feedback units and a weighing arithmetical unit, and n is a natural number and greater than 1; each sub-feedback unit comprises a feedback input end and a disturbing signal end; the weighing arithmetical unit comprises n signalinput ends and a signal output end, and each sub-feedback unit is used for collecting output voltage of the converter corresponding to each circuit and outputting sampling voltage to each corresponding signal input end of the weighing arithmetical unit; the weighing arithmetical unit is used for carrying out weighted sum on each sampling voltage and outputting feedback control quantity to a control end of a main power circuit unit. The feedback control circuit adopts common ground connection of the weighing arithmetical unit and transformer input primary side and an isolated feedback mode, sothat stable voltage output is respectively achieved among multiple isolated circuits, improves voltage accuracy and load regulation of each circuit of multiple mutual isolated circuit output of the converter, and reduces ripple wave noise output by a secondary circuit.

The invention discloses a current mode converter with self-calibration output, which aims at solving the problems in the prior art that the gain of an error amplifier is reduced and cannot meet the requirement of load regulation rate. The current mode converter specifically comprises a control logic unit, an error amplifier, a driving and dead zone control unit, a first pull-up resistor, a second pull-up resistor, a PWM (pulse width modulation) comparator and an output unit, and also comprises a digital calibration control unit, wherein the digital calibration control unit comprises a first comparator, a second comparator, a calibration module and a current mirror module. The current mode converter controls the change of current flowing through the second pull-up resistor connected on the error amplifier through the digital calibration control unit, and further changes the error voltage by a stepping method so as to maintain a smaller fluctuation of the output voltage within a wider load range and improve the load regulation rate of the system.

The invention relates to a power supply regulator of switching over type controlled by primary side, which consists of a transformer with primary side winding and an auxiliary winding being separately coupled to positive and negative electric rails, a switch being series-connected to two said windings, a control circuit coupled to switch and auxiliary winding, a supply capacity for providing power to control circuit, a dipolar body coupled to negative rail and supply capacity. The auxiliary winding comprises a leakage inductance for releasing stored energy to supply capacity through diode when switch is off and for storing energy when switch is on. The setting method between the transformer and the switch in the invention can improve the efficiency of the switching over type power supply regulator and reduce the electromagnetic interference.

A ceramic flamer with better solution for uneven flame distribution, low utilization efficiency, waste of energy, short durability, pollution issue, comprises the fuel preheat ring and assistant burning gas preheat ring inside the wall of the burner, with the top of the fuel preheat ring having fuel output and top ejection opening, fuel inlet on the outside wall and fuel preheat ring vertical connection fuel input whose top having assistant air preheat ring, outside wall accessing to the assistant air inlet in perpendicular, inside the wall twisted up on the same ring with the fuel, the top location with gas ejection, and the fuel ejection forming into ring intersected distribution. It is unique and novel in structure, efficient in solving gas mixing, gas distribution, smoke preheat and other key issues.

The invention discloses a current mode converter with self-calibration output, which aims at solving the problems in the prior art that the gain of an error amplifier is reduced and cannot meet the requirement of load regulation rate. The current mode converter specifically comprises a control logic unit, an error amplifier, a driving and dead zone control unit, a first pull-up resistor, a secondpull-up resistor, a PWM (pulse width modulation) comparator and an output unit, and also comprises a digital calibration control unit, wherein the digital calibration control unit comprises a first comparator, a second comparator, a calibration module and a current mirror module. The current mode converter controls the change of current flowing through the second pull-up resistor connected on theerror amplifier through the digital calibration control unit, and further changes the error voltage by a stepping method so as to maintain a smaller fluctuation of the output voltage within a wider load range and improve the load regulation rate of the system.

The invention discloses a grid-connected seamless switching controller based on a capacitive current inner ring and a control method thereof. The controller comprises a microcontroller, a voltage sampling circuit, a grid-connected switch driving circuit and an inverter power tube driving circuit, wherein the microcontroller comprises an electricity grid synchronous module, an output voltage controller, a capacitive reference current generator under a grid-connected mode, a grid inlet current controller, a capacitive current controller, a control command selecting switch and an inverter power tube logic generator. The grid-connected seamless switching controller is connected with an inverter of an electricity grid through a grid-connected switch, is in an output voltage control mode when in dependent operation with load and is in a grid inlet current control mode when in grid-connected operation. The grid-connected seamless switching controller is adaptable to a grid-connected invertercapable of independently operating with grid-connected double modes, increases output voltage load adjustment rate under an independent mode, increases power factors and grid inlet current waveform quality on the condition of non-linear load and electricity grid voltage distortion under a grid-connected mode, and then realizes seamless switching of two work modes.

The invention relates to the field of power electronic system control, in particular to a topological structure and a control method of a power supply for composition and capacity. The present invention is a topological structure of a power supply for composing and dividing capacity, including a three-phase AC / DC rectifier, an LLC resonant converter, and a voltage stabilizing capacitor C on the output side of the three-phase AC / DC rectifier. d In parallel with the LLC resonant converter, the voltage stabilizing capacitor C on the output side of the LLC resonant converter 0 Connected in parallel with the load battery E, the LLC resonant converter has bidirectional energy flow and automatic switching, and has the characteristics of constant voltage gain when the switching frequency is not higher than the resonant frequency; The output voltage of the resonant converter V 0 It is the outer loop, and the input current of the three-phase AC / DC rectifier is the inner loop; it realizes bidirectional flow of energy and automatic switching.

The invention discloses a method for compensating the output line voltage drop of a switching power supply. The main point of the technical solution is that the switching power supply feedback part circuit includes sampling resistor 04, reference source 03, photocoupler 02, output capacitor 05, power supply output line resistor 06, current limiting resistor 01; one end of current limiting resistor 01 and output capacitor 05 The other end is connected to the photocoupler 02, the photocoupler 02 is connected to the cathode of the reference source 03, the anode of the reference source 03 is set as the reference ground, the reference terminal of the reference source 03 is connected to the sampling resistor 04 connected in series R2, R3 The common terminal is connected; the sampling resistor 04 R2 and R3 connected in series, the R2 end of the circuit is connected to the output capacitor 05, and the R3 end is connected to the reference ground of the reference source 03; a compensation resistor is added between the reference ground of the reference source 03 and the sampling resistor 04 R3 Rd. The application of the present invention: the wire material is saved, and the load adjustment rate is improved. The occasions where this circuit can be applied include the feedback part of various switching power supplies, including but not limited to: flyback converter, forward converter, half-bridge converter, full-bridge converter, quasi-resonant converter, etc.

The invention relates to a BUCK constant voltage control circuit, which is characterized in that it includes a rectifier diode D2, a control chip, a filter capacitor C1, a sampling resistor R1, a sampling resistor R2, an inductor L1, a freewheeling diode D1 and a capacitor C3; the rectifier diode The cathode of D2 is connected to one end of the input capacitor C2 and the drain end of the control chip, the anode of the rectifier diode D2 and the other end of the input capacitor C2 are connected to the input voltage VINac, and the other end of the input capacitor C2 is connected to the circuit ground; the control chip The source terminal is internally connected to the sampling terminal and externally connected to one end of the sampling resistor R1 and one end of the sampling resistor R2, the other end of the sampling resistor R2 is connected to one end of the inductor L1, the cathode of the freewheeling diode D1 and the chip ground, and the other end of the sampling resistor R1 is connected to the inductor L1 The other end of the capacitor C3 and the other end of the capacitor C3, the other end of the capacitor C3 and the anode of the freewheeling diode D1 are connected to the line ground. The off time of the chip of the present invention is controlled by an internal control signal and is not affected by external conditions, thereby improving the load regulation rate.

The invention discloses a compensating driving device, which comprises a VCC circuit which converts an input AC signal into a DC signal and simultaneously starts and controls the device; has a compensation circuit for adjusting the load adjustment rate and temperature coefficient; and includes a chip control module for power conversion device; wherein, the power converter is connected to the VCC circuit and the compensation circuit respectively. The invention also discloses a method for realizing the compensation driving device. The invention has the characteristics of simple structure, low cost, greatly improved load adjustment rate and temperature coefficient, and the like.

The application provides a primary current control drive circuit, the primary current drive control unit controls the switch tube according to the current reference signal and the first sampling signal output by the primary current sampling unit, so that the primary current is stabilized at a set value, Further, the load current is stabilized, and the set value is adjusted according to the compensation signal output by the compensation signal generating unit, so that the load current does not change with the change of the load voltage, thereby improving the load regulation rate and realizing steady current driving; at the same time, by The anti-ripple unit eliminates or reduces the output ripple after the power unit is connected in series with the anti-ripple unit; it is not necessary to speed up the loop response speed to achieve low ripple output, which avoids the output ripple in the prior art. The wave and PF value are mutually restricted, and it is difficult to take into account the problem at the same time.