103results about How to "Wide output voltage range" patented technology

A voltage regulator includes a linear mode regulator having a high pass filter circuit connected between its output and an output node, and a switch mode regulator having an low pass filter circuit connected between its output and the same output node. The high pass filter passes high frequency AC current provided by the linear mode regulator to the output node and reduces the low frequency AC and DC currents to substantially zero, and the low pass filter prevents the high frequency AC current produced by the linear mode regulator from being drawn by the switch mode regulator and passes the low AC and DC currents provided by the switch mode regulator to the output node. Thus, the present regulator offers the high response speed and low noise of a linear mode regulator, and the high power efficiency and large continuous output current capability of a switch mode regulator.

[Means for Solving the Problem] In a current switch circuit A used for a current steering D / A converter, a current switch basic circuit 1 includes first and second transistors Tr121 and Tr122 included in a differential switch 12. A threshold voltage control circuit 5 has an output terminal Vbout controlling the substrate voltage to be outputted to the substrate terminal of each of the two transistors Tr121 and Tr122 included in the differential switch 12 for controlling the threshold voltage of the two transistors of the differential switch. Accordingly, the present invention improves the decrease in the dynamic range of the current switch basic circuit 1 dependent on the threshold of each of the two transistors in the differential switch 12 and realizes a wider output voltage range without causing deterioration in properties even in a case that the power voltage is reduced in the current switch basic circuit 1.

The invention discloses a wide-range bidirectional conversion circuit and a control method. The wide-range bidirectional conversion circuit comprises a three-stage bidirectional converter and a control unit, and the three-stage bidirectional converter is formed by sequentially connecting a non-isolated DC / DC converter, an isolated DC / DC converter and a DC / AC inverter. When the system works in theforward direction, a direct-current power supply or energy storage equipment realizes grid-connected energy feedback through the non-isolated DC / DC converter, the isolated DC / DC converter and the DC / AC inverter; and during reverse working, an alternating voltage supplies power to a direct-current load or charges an energy storage device through a rectifying circuit, the isolated DC / DC converter and the non-isolated DC / DC converter. In order to adapt to different power levels and realize higher input current ripple control, the non-isolated converter adopts a multi-phase interleaved parallel structure; and in order to further broaden the requirements of input and output ranges in practical application, the isolated converter can be controlled by adopting a full-bridge / half-bridge variable structure. The whole system has the advantages of wide input direct-current voltage range, wide output alternating-current voltage range, wide load range, small current ripple, high-frequency isolation, high efficiency, energy conservation, environmental protection and the like.

The invention provides a bidirectional resonant conversion circuit, a converter and a control method thereof. The bidirectional resonant conversion circuit with a variable structure comprises a first filter circuit, a first full bridge circuit, a resonant conversion circuit, a second full bridge circuit and a second filter circuit, wherein resonant capacitors are respectively arranged on a primary side and a secondary side of the resonant conversion circuit, and are respectively turned on and off by a switch. The control method comprises the steps of allowing the full bridge circuit to enter an active switch mode or a diode mode according to an energy flow direction, thus respectively allowing the switch to be in a closed or blocked state. Therefore, efficient bidirectional conversion of energy is achieved, and the bidirectional full bridge resonant direct current / direct current converter with the variable structure and a control method thereof are more practical.

The invention provides a full-bridge LLC resonant conversion circuit. The full-bridge LLC resonant conversion circuit comprises a conversion circuit and a rectification circuit, wherein the conversioncircuit comprises four switch tubes Q1, Q2, Q3 and Q4, the conversion circuit is partially provided with a resonant capacitor Cr and a resonant inductor Lr which are connected in series, one end of the resonant inductor Cr is connected with a bridge arm, the resonant inductor Lr is connected with the other one bridge arm. The invention provides a wide-range output control method of the full-bridge LLC resonant conversion circuit. According to the wide-range output control method, the full-bridge LLC resonant conversion circuit works in a full-bridge working mode when an output voltage U0 is larger than (U<0max>+U<0min>) / 2; and the switching between the full-bridge working mode and a half-bridge working mode is performed when the full-bridge LLC resonant conversion circuit works in the half-bridge working mode and the output voltage is equal to (U<0max>+U<0min>) / 2. By the full-bridge LLC resonant conversion circuit, a wider output voltage range can be provided, and a better output characteristic index such as higher efficiency and smaller output voltage ripple can be obtained.

The invention discloses a wide range output control method for an LLC resonant transformation circuit. The LLC resonant transformation circuit works under different working modes depending on correlation between the output voltage and the load size. The trend is that the LLC resonant transformation circuit works under a variable frequency working mode when the LLC resonant transformation circuit is in a high output voltage or heavy load state; when the LLC resonant transformation circuit is in a low output voltage or light load state, the LLC resonant transformer works under a working mode with a fixed frequency variable effective duty ratio or under an intermittent working mode with a fixed frequency fixed effective duty ratio. According to the method provided by the invention, the wide range output voltage requirement of the LLC resonant transformation circuit can be effectively met.

The invention discloses a system for method for implementing an ultra-wide output voltage range on the basis of an LLC topology. The system comprises a full-bridge LLC topology structure, wherein a switching circuit is arranged on a bridge arm of a switching tube full-bridge circuit of the full-bridge LLC topology structure; and states of the switching circuit can be switched to form a switching tube half-bridge circuit. The system is simple in structure, switching between full-bridge LLC and half-bridge LLC can be realized, and a DC / DC part of a charging module can work nearby a resonance point in most cases to reduce switching loss. Compared with a mode of independently using a charging module of a full-bridge LLC and a charging module of a half-bridge LLC, the method has the advantages that the output voltage range can be expanded effectively under the condition that the cost is not increased, design of a resonant network is facilitated, and efficiency under low voltage is improved.

A touch sense circuit comprises a first sampling circuit to sample a touch sense signal during a first period of a touch drive signal in which the touch drive signal is at a first level, to generate a first sampled signal; a second sampling circuit to sample the touch sense signal during a second period of the touch drive signal in which the touch drive signal is at a second level, to generate a second sampled signal, the second sampled signal in a same polarity as the first sampled signal; and an integrator including an input terminal and an output terminal, both the first sampled signal and the second sampled signal being input to the input terminal of the integrator and integrated to generate an output signal at the output terminal of the integrator, the output signal being used to detect a touch input.

The invention relates to storage battery charge and discharge circuit topology which comprises a first stage of circuit, a second stage of circuit and a digital signal processor (DSP) controller; the first stage of circuit comprises three phases of alternating current power grids and an inverter circuit; the inverter circuit is provided with six transistors of a three-phase bridge, and the second stage of circuit comprises a first conversion circuit, a transformer, a second conversion circuit and a battery; and the DSP controller controls the output voltage, the output current and the switching direction of the inverter circuit and two direct current-direct current (DC-DC) conversion circuits so as to control the charge or the discharge of the whole circuit. After the device is adopted, charge and discharge with unit power factor can be realized for a power grid side; the pollution to the power grid is little; through a certain control method, a pulse width modulation (PWM) rectifier can realize a scalable vector graphics (SVG) function; the output of a wide voltage scope can be realized; and the charge and discharge efficiency is higher.

The invention discloses a light-emitting diode (LED) lamp controller based on a digital pulse-width modulation (PWM) control technology. The LED lamp controller comprises a power management module, a direct current-direct current (DC-DC) convertor, a constant current control circuit which corresponds to one or more sets of LED lamp strings one to one, and a control module, wherein the input end of the power management module receives a power voltage signal input from the outside; the control module receives a PWM signal input from the outside; the input end of the DC-DC convertor is electrically connected with the output end of the power management module; the output end of the DC-DC convertor is electrically connected with one end of the one set of LED lamp string or of each of the multiple sets of LED lamp strings; the control module is electrically connected with the control end of the DC-DC convertor and the input end of the constant current control circuit; and the output end of the constant current control circuit is electrically connected with the other end of the one set of LED lamp string or of each of the multiple sets of LED lamp strings. A combined circuit formed by basic components is used for controlling a signal set of LED lamp string, and multiple sets of LED lamp strings which are parallelly connected with one another; and the LED lamp controller has the characteristics of low cost and flexile control.

The invention provides a bidirectional full-bridge resonance direct-current / direct-current converter and a control method thereof. The converter comprises a first filter circuit, a first full-bridge circuit, a resonance conversion circuit, a second full-bridge circuit, a second filter circuit and a control unit, and the control unit respectively collects working current of the first filter circuit and the second filter circuit and respectively controls the first full-bridge circuit and the second full-bridge circuit according to preset signals. The control method includes: enabling the full-bridge circuits to enter an active on-off mode or a diode mode according to energy flow direction to realize efficient bidirectional conversion of energy. The bidirectional full-bridge resonance direct-current / direct-current converter and the control method have higher practicability.

The invention belongs to the power electronics technological field, and more particularly, to a control method for LLC current converter with wide output range. The method of the invention adopts a control manner for flexibly switching the LLC current converter between a full bridge mode and a half bridge mode, which determines the working mode of the LLC according to the requirement on the output voltage of the LLC current converter. When the output voltage of the LLC current converter is less than the output voltage at the peak of the half bridge LLC current converter, the LLC current converter runs in the half bridge mode; when output voltage of the LLC current converter is greater than the output voltage at the peak of the half bridge LLC current converter, the LLC current converter runs in the full bridge mode. The switching point between the half bridge and the full bridge is where the peak of the gain curve of the half bridge LLC current converter occurs. The invention realizes the ability of the LLC current converter to work in a wide voltage gain and narrow frequency range, which further improves the frequencies of a resonant inductor and an isolating transformer, reduces the sizes and weights of the resonant inductor and isolating transformer, and improves the power density of the LLC current converter.

The invention discloses a cascaded flexible AC (alternating-current) link converter topological structure which comprises a three-phase AC power supply, three power regulation units, three Buck type direct AC-AC converters UT-AC, a three-phase multi-winding isolation transformer and three LC low-pass filters, wherein each power regulation unit is formed by two bipolar direct type AC-AC convertersBT-AC. According to the topological structure of the invention, the power flow between interconnected feeder lines can be controlled, the power restoration of an isolated load can be realized under the condition of a flexible interconnection fault of feeder lines in a power distribution network, the permeability of distributed power generation in a power distribution network can be improved through the flexible interconnection of the feeder lines in the power distribution network, and the electric energy quality and the power supply reliability of the power distribution network are improved.

System for a current source with enhanced output impedance. A preferred embodiment comprises a cascode current source arranged in a current mirror configuration (such as current source 600) with a pair of level shifters arranged in a source-follower configuration (such as level shifters 505 and 510). The level shifters reduce the compliance voltage of the current source, permitting use in low voltage applications.

An efficient control method for an isolated multilevel DC / DC resonant converter achieves a wide output voltage range with a narrow device switching frequency range, relative to the output voltage range and the device switching frequency range of the prior art. At any given time, a control circuit selects one of three different modulation schemes to operate the primary-side switching devices of the resonant converter based on at least one of output voltage, output current, input signal, and one or more external control signals. Together with a selected device switching frequency, the three modulation schemes generate different voltage waveforms to a primary-side transformer, which are coupled to the secondary-side to provide different output voltages.

The invention provides a resonant converter with series-parallel seamless conversion, and belongs to the technical field of power electronics. The resonant converter comprises a DC power supply, a switching circuit, a resonance circuit, a rectifier circuit and a filter circuit which are sequentially electrically connected. The switching circuit is controlled by an external controller. The resonance circuit comprises a resonance module connected to the switching circuit and a transformer module connected to the resonance module. The transformer module comprises N transformers. The resonance module comprises N resonance sets. The switching circuit comprises N sets of switching modules, wherein N is no less than 2 and is even. The rectifier circuit includes a first rectifier module, a secondrectifier module and a third rectifier module. The resonant converter solves the problem that the existing resonant converter is limited in constant power output voltage range, discontinuous in outputvoltage range, high in cost, large in volume and incapable of outputting zero voltage.

The invention provides a phase frequency detector and charge pump circuit for a phase locked loop. The prior art has the defects of poor linearity and noise performance, so when a first series circuit is connected with the output end of a current pump, an upstream biasing circuit is used as a biasing circuit of an upstream current source; and when a second series circuit is connected with the output end of the current pump, a downstream biasing current source is used as a biasing circuit of a downstream current source. By adding the two fixed biasing currents and selecting proper biasing current according to the output voltage of the charge pump, phase difference of two input ends of the phase frequency detector deviates from zero after the PLL loop is locked, so that the aim of enhancing the linearity of the phase frequency detector and the charge pump and improving the noise performance of a fractional-N phase locked loop can be achieved.

The present invention discloses an active clamping magnetic reset-based bi-directional AC-DC converter and belongs to the power conversion technical field. The converter is composed of an alternating current-side filtering unit, a three-phase rectifying / inverting bridge arm, an alternating current-side switching circuit, a high frequency isolation transformer, an active clamping magnetic reset circuit, a direct current-side switching circuit and a direct current-side filtering unit. According to the converter, the voltage stress of a direct current-side switching tube is low; an alternating current side switching tube works at a low frequency, so that switching loss is small; energy can flow bidirectionally; and high frequency electrical isolation can be realized. The active clamping magnetic reset-based bi-directional AC-DC converter is suitable for being adopted as an interface converter between a power grid and a storage battery.

The invention relates to a high-performance charge pump circuit in a low-voltage charge pump phase-locked loop. The high-performance charge pump circuit comprises a charge-discharge circuit and a current duplicate circuit, wherein a first current duplicate branch circuit, a second current reproduce branch circuit, a first charge-discharge branch circuit and a second charge-discharge branch circuit are connected with a bias circuit; the second current duplicate branch circuit and the first charge-discharge branch circuit are connected with a first rail-to-rail operational amplifier; the first current duplicate branch circuit and the second charge-discharge branch circuit are connected with a second rail-to-rail operational amplifier; an output end of the first rail-to-rail operational amplifier is connected with a non-inverting input end through a first Miller compensating circuit; an output end of the second rail-to-rail operational amplifier is connected with a non-inverting input end through a second Miller compensating circuit; and the current ratio of the second charge-discharge branch circuit to the first current duplicate branch circuit and the current ratio of the first charge-discharge branch circuit and the second current duplicate branch circuit are equal. According to the high-performance charge pump circuit in the low-voltage charge pump phase-locked loop, the current matching range can be expanded, the dynamic current matching performance is good, the stability is high, and the circuit is safe and reliable.

The invention discloses a multi-mode control method for a voltage source type semi-active bridge DC-DC (Direct Current) converter, which belongs to the direction of high frequency switching power supply in the field of power electronics. The implementation method of the invention comprises the following steps that: in the case of heavy load, the converter operates in a traditional single phase shift control mode, the switching period is constant, and VAB high level time or low level time is constant; a output voltage Vout is adjusted to be stable by adjusting the phase shift between a input side voltage and a output side voltage; in the case of light load, the converter operates in a frequency modulation + PWM (Pulse Width Modulation) mode, and the VAB high level time or the low level timeis constant; VAB duty cycle is adjusted to be stable by adjusting a switching frequency, that is, a VAB period, that is, a fixed width frequency modulation mode; and in the case of extremely light load and no load, the converter operates in a constant frequency + PWM mode, that is, a fixed frequency width regulation mode. Three control modes can switch automatically and seamlessly based on load cases. According to the multi-mode control method for the voltage source type semi-active bridge DC-DC converter, conversion efficiency of the converter under the light load can be significantly improved, the converter has high conversion efficiency within a full load range, and power density of the converter is improved.

The invention discloses a medium voltage frequency conversion power circuit system, which belongs to the technical field of electric power systems, and comprises a step-down transformer, a converter array and a step-up transformer which are sequentially connected in series, wherein the input end of the step-down transformer is connected with the output end of a three-phase supply of a medium voltage power grid, and the output end of the step-up transformer is a frequency conversion voltage output. The invention reduces the number of three-phase rectifiers and has balanced power, so the output voltage can be further improved, and the system has the advantages of simple integral structure, improved power grid side power factor and more perfect overall performance.

A current mirror includes a serially connected diode-connected transistor of a first conductivity type, a saturated (fully-on) transistor of a second conductivity type, and a current source for providing a reference current. A gate voltage generated by the diode-connected transistor in response to the reference current is provided to the gate of a matching transistor. This causes the matching transistor to mirror the reference current. Meanwhile, an output transistor cascoded with the matching transistor is gate-coupled to the junction between the saturated transistor and the current source. This allows the output transistor to provide an output voltage swing from one supply voltage to two saturation voltage drops from the second supply voltage. Meanwhile, the cascode configuration gives the current mirror a high output impedance.

The invention discloses a high-speed wide-range high-precision programmable power source of multi-electrode active photoelectric devices. The high-speed wide-range high-precision programmable power source comprises a digital control unit formed by a high-speed logic device FPGA, high-speed digital-to-analogue conversion units DAC and high-speed computation voltage amplifier circuits. The output ends of the high-speed digital-to-analogue conversion units DAC are connected with the input ends of the high-speed computation voltage amplifier circuits in series to form digital-to-analogue conversion amplifier circuits, a plurality of output ends of the digital control unit are in one-to-one connection with the input ends of the digital-to-analogue conversion amplifier circuits, and the output ends of the digital-to-analogue conversion amplifier circuits are in one-to-one connection with the input ends of the active photoelectric devices. By means of the high-speed wide-range high-precision programmable power source of the multi-electrode active photoelectric devices, the defects of a common power source are overcome. The high-speed wide-range high-precision programmable power source also has the advantages of being wide in output voltage range, high in accuracy, quick in switching speed and the like and becomes an essential driving source for multi-electrode tunable laser static and dynamic testing.

The invention provides a two-path symmetrical-output adjustable power source. According to the two-path symmetrical-output adjustable power source, a direct-current power source is connected with the first input end of a switching-mode power source module. The switching-mode power source module is used for controlling and outputting a positive voltage and a negative voltage according to the error between a reference voltage and an output voltage of a first operational amplifier. The positive voltage and the negative voltage are in common-ground link, and absolute values of the positive voltage and the negative voltage are equal. The input end of a positive adjusting module is connected with the positive voltage, and the output end of the positive adjusting module is used for outputting a positive output voltage of the adjustable power source and used for adjusting the positive output voltage according to feedback of a given voltage and the positive output voltage. The input end of a negative adjusting module is connected with the negative voltage, and the output end of the negative adjusting module is used for outputting a negative output voltage of the adjustable power source and used for adjusting the negative output voltage according to the positive output voltage. The positive phase input end of the first operational amplifier is connected with the positive voltage, the inverted phase input end of the first operational amplifier is connected with the positive output voltage, and the output end of the first operational amplifier is connected with the second input end of the switching-mode power source module. The positive path of voltage and the negative path of voltage are traced, load current is balanced, and output symmetry is guaranteed.

The present invention relates to an electrical power adaptor with self-adjusting output voltage regulation which comprises a switching power supply circuit for converting an alternate current into a direct current, and a power supply return circuit connecting with the switching power supply circuit. The switching power supply circuit comprises an EMI filter circuit, a full-bridge rectifier circuit, a switching transformer, a secondary rectification filter circuit, a PWM control circuit and an optocoupler feedback control circuit. The power supply return circuit comprises an output line, output adaptor and an MCU main control circuit. The MCU main control circuit is connected with the switching power supply circuit. The output adaptor is disposed with a signal resistor. The MCU main control circuit controls the output voltage of the switching power supply circuit according to the signal resistor of the output adaptor. The electrical adaptor of the present invention provides a wider range of output voltages with higher precision. Furthermore, by connecting a signal resistor to an output adaptor and altering feedback resistance of a feedback network according to feedback signals of the signal resistor, the signal resistor is not required to meet a very high standard of precision. The design of the present invention is safer and more personalized.

System for a current source with enhanced output impedance. A preferred embodiment comprises a cascode current source arranged in a current mirror configuration (such as current source 600) with a pair of level shifters arranged in a source-follower configuration (such as level shifters 505 and 510). The level shifters reduce the compliance voltage of the current source, permitting use in low voltage applications.

The invention provides a non-symmetric Z-source half-bridge converter with a dual output function. The converter comprises a direct-current power supply, a diode, a first capacitor, a second capacitor, a first inductor, a second inductor, a first switching tube, a second switching tube, a third switching tube, a first load and a second load. The first inductor, the second inductor, the first capacitor and the second capacitor constitute a Z source impedor. Due to the adoption of the Z source impedor, damage caused by direct connection of the switching tubes is avoided, and a boosting effect can be achieved when direct connection of the switching tubes happens. Two-way output boosting and step-down can be respectively controlled by controlling the switch-on time and duty ratio of the three switching tubes, and symmetry and asymmetry of positive pulses and negative pulses of two-way output voltages can be achieved. Only three switching tubes are used, it is not needed that capacitors are connected on a power supply side in parallel, and dual-way output can be achieved. The non-symmetric Z-source half-bridge converter with the dual output function has the advantages of being high in reliability, wide in output voltage range and rich in output alternating current pulse waveform and is particularly suitable for dual-output electrochemistry power supply devices for electrolysis, electroplating and other electrochemistry aspects.

The invention discloses a three-level and five-level hybrid modulation method for a single-phase inverter, and the method comprises the steps: employing an inverter circuit which comprises a DC powersupply, a field effect transistor, an inductor, a capacitor and a resistor, and enabling an AC side midpoint to be connected with a DC side midpoint N through the inverter circuit in order to reduce acommon-mode voltage; and according to the method, a three-level modulation method and a five-level modulation method are used in a mixed mode, the three-level modulation method is used when the modulation ratio is higher than 0.2, the five-level modulation method is used when the modulation ratio is lower than 0.2, and the method has the following remarkable advantages that the output voltage range is 2-115 V, the output frequency range is 47-10000 Hz; THD can meet the requirement that THD is smaller than 2% through mixed use of the three-level modulation and five-level modulation methods; the circuit is compact in structure and small in size; and the output power is high and can reach 6VA.