86 results about "Cross regulation" patented technology

The invention relates to a DC / DC converter design. The converter requires only one single inductor to draw energy from one input source and distribute it to more than one outputs, employing Flexible-Order Power-Distributive Control (FOPDC). It include a single inductor, a number of power switches, comparators, only one error amplifier, a detecting circuit and a control block to regulate outputs. This converter can correctly regulate multiple outputs with fast transient response, low cross regulation, and effective switching frequency for each output. It can work in both discontinuous conduction mode (DCM) and continuous conduction mode (CCM). Moreover, with FOPDC, future output extension is simple, making a shorter time-to-market process for next versions of the converter. The design can be applied to different types of DC-DC converter.

A current resonant DC-DC converter of multi-output type is provided which comprises an output-regulatory MOS-FET 40 connected between a secondary winding 5c of a transformer 5 and a smoothing capacitor 16 in a second rectifying smoother 17, and an output control circuit 41 for controlling the on-off operation of output-regulatory MOS-FET 40 based on voltage VO2 from smoothing capacitor 16 in second rectifying smoother 17. By turning the on-off operation of output-regulatory MOS-FET 40 in synchronization with switching frequency of first or second MOS-FETs 1, 2, an ideal cross regulation among respective DC outputs can be obtained, providing the inexpensive converter with simple circuit alteration capable of producing highly stable DC outputs with high power conversion efficiency, high accuracy and less power conversion loss.

A method and apparatus are disclosed for single-inductor multiple-output switching converter design. With the proposed freewheel switching control, this converter operates in a pseudo-continuous conduction mode (PCCM) and is capable of handling large load currents with a much smaller current ripple and peak inductor current, while retaining low cross regulation. It can also work in discontinuous conduction mode (DCM) for high efficiency at light loads. This design can be applied to have single or multiple outputs and for different types of DC-DC conversions.

A current resonant DC-DC converter of multi-output type is provided which comprises an output-regulatory MOS-FET 40 connected between a secondary winding 5c of a transformer 5 and a smoothing capacitor 16 in a second rectifying smoother 17, and an output control circuit 41 for controlling the on-off operation of output-regulatory MOS-FET 40 based on voltage VO2 from smoothing capacitor 16 in second rectifying smoother 17. By turning the on-off operation of output-regulatory MOS-FET 40 in synchronization with switching frequency of first or second MOS-FETs 1, 2, an ideal cross regulation among respective DC outputs can be obtained, providing the inexpensive converter with simple circuit alteration capable of producing highly stable DC outputs with high power conversion efficiency, high accuracy and less power conversion loss.

A cost effective circuit improves the cross regulation of multiple outputs converter, especially for that output chokes are coupled and a synchronous rectifier is applied to one of the outputs. A DC / DC converter includes a transformer having a primary winding and two secondary windings. The first secondary winding is coupled to a synchronous rectifier and a first output choke. The second secondary winding is coupled to a diode rectifier and a second output choke. The first output choke and the second output choke are coupled. A low power MOSFET switch is added to the diode rectifier for avoiding the diode rectifier operating in DCM when light loaded.

A method and apparatus is featured for providing linear control of a regulated electrical property (e.g., current or voltage) in a switch mode power supply of a thermal processing system that includes an inductive element and at least one switching element. The method and apparatus feature structure, or steps, for generating a nonlinear model that predict values for a regulated electrical property of the inductive element based on a given duty cycle of the at least one switching element and structure, or steps, for generating a nonlinear model that determines a duty cycle for the at least one switching element based on the nonlinear predictive model for the regulated electrical property, the nonlinear model determining the duty cycle such that a linear relationship results between the regulated electrical property and a selected value. A method and apparatus is also featured for providing cross regulation between pre-regulator and post-regulator power stages of a switch mode power supply of a thermal processing system.

The present invention relates to a Single Inductor Double Output (SIDO) power converter, which comprises a power-stage circuit, a current detector, a slope compensation device, at least two error amplifiers, a comparing unit, a mode exchange circuit, a logical device and a driver. The SIDO current converter achieves an optimal SIDO power converting efficiency by controlling a full-current mode. Furthermore, different power transferring modes, under a variety of loadings, are used to address the issue of cross regulation and at meanwhile solving output voltage ripples and transient response to ensure the SIDO power converter a more flexible usage environment and better output performance.

For use with a flyback converter having a modulator for providing a main switch control signal thereto and main and cross-regulated output circuits, the cross-regulated output circuit subject to ringing and resulting voltage excursion, a voltage excursion controller and a method of operating the same. In one embodiment, the controller includes: (1) a delay circuit, coupled to the modulator, that generates a delay signal based on the main switch control signal and (2) an auxiliary switch, associated with the cross-regulated output circuit, that receives the delay signal and opens to isolate at least a portion of the ringing within said cross-regulated output circuit.

A multi-channel circuit having respective channels powered through transformers having primary windings connected in series allows substantially equal constant currents to be provided through all channels by cross-regulation while only a single channel need be monitored and controlled. The variation in current between channels is generally small and largely insensitive to imbalances between voltages on loads due, for example, to different numbers of LEDs in series connected strings in illumination devices and can be further reduced by inverse coupling between inductors in respective channels. Efficiency is improved through reduction in the number of stages of the constant current source since the respective channels provided both DC-to-DC conversion and constant current regulation.

A multi-output current-resonant type DC-DC converter comprises an output controlling MOS-FET (40) connected between a second secondary winding (5c) of a transformer (5) and a second output smoothing capacitor (16) of a second rectification smoothing circuit (17), and an output control circuit (41) for controlling the ON / OFF of an output controlling MOS-FET (40) on the basis of the voltage V02 of the second output smoothing capacitor (16). By turning ON / OFF the output controlling MOS-FET (40) in synchronism with the switching frequency of a first or second main MOS-FET (1, 2), it is made possible to achieve an ideal cross regulation with each DC output and to achieve a highly stable DC output with a little power conversion loss and with a simple circuit change. The multi-output current-resonant type DC-DC converter realized is inexpensive but high in the power conversion efficiency, and can have a highly precise DC output.

A single-inductor-multiple-output (SIMO) DC-DC switching regulator with a current-mode hysteretic control technique having an ultra-fast transient response to suppress cross-regulation is provided. The DC-DC switching regulator includes: at least one power source for providing electrical energy; an inductive energy storage element for accumulating and transferring the electrical energy from the input power source to a plurality of outputs; a main switch for controlling energy accumulation at the inductive energy storage element; a plurality of output switches for controlling energy transfer to each of the plurality of outputs; a freewheel switch coupled in parallel with the inductive energy storage element; and a controller, configured to coordinate the plurality of output switches and the main switch.

A power conversion system and power control method for reducing cross regulation effect uses a voltage feedback adjustment circuit to modulate an error signal fed back from an output voltage so as to predict the energy of an output corresponding to its load states. While the energy delivered to an output terminal with its load remaining the same does not change, the energy delivered to an output terminal with its load changing is adjusted accordingly. The power conversion system thus effectively reduces the cross regulation effect and obtains excellent steady system output and transient response.

The invention relates to a method for deforming a smart graph-driven grid image. In the method, global deformation parameters of the image are mapped to a two-dimensional grid to drive the grid to deform; the grid drives an embedded image of the grid to deform so as to solve the problems of non-accurate image deformations similar to cartoon animation deformations; and a user can quickly acquire an image deformation result through the interaction control of a control point on a smart graph. The method adopts a smart graph-based deformation driving template which has the characteristics of an embedded deformation rule and multi-component coordinative deformation, and can automatically generate appropriate grid driving parameters according to the global deformation parameters so as to generate a grid effect in real time. Besides, by performing cross regulation on different deformation weight coefficients, the method can control the deformation intensity. The method can acquire a two-dimensional grid deformation result of the embedded deformation rule at an interactive real-time speed, and can conveniently and quickly generate a deformation effect of a two-dimensional cartoon animation image by further solving the coordinate mapping and the gray mapping of an image pixel under grid driving.

A power supply, which outputs a plurality of voltages in order to improve the cross regulation between output voltages and at the same time reduce the amount of electric power consumed, and an image forming device having the same are disclosed. The power supply includes a power converter, which generates a first output power source and a second output power source in response to an external power supply and a power control signal, respectively; a power output part, which includes output parts to rectify and smooth each of the first and second output power sources; a first output controller, which receives the first output power source feedback from the power output part to generate the power control signal; and a second output controller, which receives the second output power source feedback from the power output part to control to operate the power output part in stable mode.

The invention discloses a single-inductor multi-output DC-DC converter and a control method thereof. The converter comprises a single-inductor multi-output DC-DC converter power stage, a current / voltage sampling circuit, a voltage analog-to-digital converter (ADC) module, an error signal generation module, a multi-path circuit proportional integral (PI) module, a duty ratio re-allocation module, a multi-path digital pulse width modulation module, a summator / subtracter, a current PI module, a digital pulse width modulation module, a new duty ratio total sum generation module, a switch logic and a dead zone control and driving circuit. By stretching and contracting an old duty ratio signal according to proportion to further control, and the cross regulation rate of the converter is reduced; meanwhile, the signal bit width is reduced by Sigma-Delta truncation during telescopic conversion, meanwhile, the precision is ensured, hardware calculation resources are saved, the calculation speed is increased, and the cost is reduced. The single-inductor multi-output DC-DC converter and the control method thereof can be widely applied to the technical field of electronics.

A novel method to operate and control single inductor multiple output switching power converter is presented. The method includes the means for generating one or more synthetic ripple signals and operating the converter at constant switching frequency allowing high frequency operation, maintaining stability in all conditions with minimum cross regulation between the outputs independently on the levels of load present at the outputs. The method further includes means for setting the maximum frequency of multiplexing the energy stored in the inductor between the various outputs reaching the desired compromise between the value of the output capacitors, the switching frequency of the output power devices and the acceptable output voltage ripple.Two different topologies are proposed that can be used for single inductor multiple output buck power converters and for boost power converter allowing the extension to buck-boost configurations as well.

The present invention relates to a Single Inductor Double Output (SIDO) power converter, which includes a power-stage circuit, a current detector, a slope compensation device, at least two error amplifiers, a comparing unit, a mode exchange circuit, a logical device and a driver. The SIDO current converter achieves an optimal SIDO power converting efficiency by controlling a full-current mode. Furthermore, different power transferring modes, under a variety of loadings, are used to address the issue of cross regulation and at meanwhile solving output voltage ripples and transient response to ensure the SIDO power converter a more flexible usage environment and better output performance.

The invention discloses a multipath-output switch power supply circuit which comprises a transformer with a plurality of output circuits and a controller which controls the transformer input. The transformer is a forward transformer. Each output circuit comprises an energy storage inductor. At least two output circuits are respectively connected with an input end of the controller by a feedback circuit, wherein, the energy storage inductors in partial output circuits work under a continuous mode, and the energy storage inductors in the other output circuits work under a discontinuous mode. The multipath-output switch power supply circuit has simple structure and can improve the cross regulation performance.

The invention discloses a multipath output switch power supply and an inverter. An auxiliary voltage output terminal of the multipath output switch power supply is connected to a protection circuit in series; the protection circuit comprises a switch device and a resistor; the switch device and the resistor are connected in series; and the multipath output switch power supply also comprises a control circuit which is used for controlling the switch device to switch off before an auxiliary output load of the multipath switch power supply accesses the circuit. The multipath output switch power supply and the inverter overcome the problem of overvoltage damage of the auxiliary output load which is brought by a poor cross regulation rate of the multipath output switch power supply.

The present invention relates to a double-output half-bridge LLC serial resonant converter, comprising: a half-bridge rectifying unit, a first resonant unit, a first transformer unit, a first rectifying unit, a first output unit, a second resonant unit, a second transformer unit, a second rectifying unit, a second output unit, a voltage dividing unit, a voltage regulating unit, a light-coupling isolation unit, and a control unit. In the present invention, the double-output half-bridge LLC serial resonant converter has an inventive circuit framework, which can not only solve the unbalance load current and the output voltage cross regulation occurred in the conventional double-output convertor, but also normally modulate the no-load or light-load output voltage; therefore the output voltage deviation can be effectively controlled.

A resonant DC to DC converter circuit receiving an input voltage and capable of delivering multiple output voltages, while maintaining excellent cross-regulation with only one power transformer. The circuit of the invention uses trailing edge modulation, along with a new amplitude modulation arrangement which allows for the use of resonance with synchronous rectification and only a single power transformer. Thus, the circuit provides for DC to DC conversion, as well as an amplitude modulation arrangement.

The invention particularly relates to a method for improving the cross regulation rate of a multi-path output switching power supply. According to the technical scheme of the method for improving the cross regulation rate of the multi-path output switching power supply, a secondary main output winding Ns1 circuit switching tube is connected in parallel with an RCD absorption circuit. The RCD absorption circuit comprises a resistor R2, a capacitor C2 and a rectifier diode D3. The resistor R2 and the capacitor C2 are connected in series and then are connected in parallel with the rectifier diode D3. The RCD absorption circuit absorbs the leakage inductance voltage spike at the secondary conduction instant. Based on the method for improving the cross regulation rate of the multi-path output switching power supply, the RCD absorption circuit is arranged on the secondary output winding side so as to directly absorb and suppress the leakage inductance voltage spike of a secondary output winding. Therefore, the absorption effect of the method is better than that of the primary side voltage clamp control. At the same time, in combination with a primary side clamp circuit, the leakage inductance voltage spike and the leakage inductance energy coupling of a transformer can be further reduced. The stability of the auxiliary output voltage is improved. Moreover, the cross regulation rate of the multi-path output switching power supply is improved.

An embodiment of the present invention provides a multi-output flyback converter, The multi-output flyback converter comprises an input unit, a switching unit, a control unit, a voltage feedback unitand a plurality of mutually independent transformers, wherein, each of the transformers comprises a primary side winding, a secondary side winding and a primary side feedback winding; The input unit,the primary winding of the transformer and the switching unit are connected to form a primary side loop, and the primary winding of the plurality of transformers are connected in parallel in the primary side loop; An input terminal of the voltage feedback unit is connected to an output terminal of the plurality of primary feedback windings, and a reference ground of the primary feedback windings is the same as a reference ground of the control unit; The output terminal of the control unit is connected to the control terminal of the switching unit. The embodiment of the invention can effectively improve the cross regulation rate of the output voltages of each transformer while avoiding the use of a high-cost isolation feedback circuit.

The invention discloses a circuit for improving the multi-path output cross regulation rate of a switching power supply. The circuit has reliable and practical performance and low cost, is particularly suitable for places with low cost requirements and well improves the multi-path output cross regulation rate; and the output of each path is highly accurate. The circuit for improving the multi-path output cross regulation rate of the switching power supply comprises optocouplers D2 and D4, resistors R1, R2, R3, R4, R5, R6, R7 and R8 and three-end adjustable shunt reference sources D1 and D3.

The switched-mode power supply includes an output value sensor circuit measuring a current flow through a switching device and a switching control circuit implementing overcurrent protection. Also included in the power supply are: a second output voltage sensor circuit detecting a high output voltage Vo2 for the second load; and a short-circuit device 18 quasi-shorting the terminals of the second load when the detected value of the voltage is more than or equal to a specific value. Therefore, if the short-circuit device 18 shorts out, the secondary load increases, and the output for the relatively low load L1 can be restrained by overcurrent protection. Thus, a reliable overcurrent protection can be achieved using a simple construction by means of cross-regulation, without a complex arrangement where a separate current sensor circuit is provided to each output of the secondaries to terminate or control the outputs independently from each other based on the detected current values.

A power supply, which outputs a plurality of voltages in order to improve the cross regulation between output voltages and at the same time reduce the amount of electric power consumed, and an image forming device having the same are disclosed. The power supply comprises a power converter, which generates a first output power source and a second output power source in response to an external power supply and a power control signal, respectively; a power output part, which comprises output parts to rectify and smooth each of the first and second output power sources; a first output controller, which receives the first output power source feedback from the power output part to generate the power control signal; and a second output controller, which receives the second output power source feedback from the power output part to control to operate the power output part in stable mode.