149 results about "Smoothing circuits" patented technology

An active flyback converter according to one or more embodiments may include a transformer, a first series circuit including the primary winding and a main switch connected in series at both terminals of the DC power supply, a second series circuit including a switch and a capacitor connected in series at both terminals of the primary winding, a controller that turns on and off the main switch and the switch, a rectifier smoothing circuit, and an output voltage detector that detects the output voltage of the rectifier smoothing circuit. In one or more embodiments, the controller may control a first off period from a first drive signal is turned off to a second drive signal is turns on, and a second off period from the second drive signal is turned off to a third drive signal is turned on.

A first series circuit includes a main switch and a resonant switch. A second series circuit includes a primary winding and a resonant capacitor. A transformer includes the primary winding and a secondary winding. A controller controls the main switch and the resonant switch. A rectifier smoothing circuit rectifies and smoothes a voltage in the secondary winding. An output voltage detector detects an output voltage of the rectifier smoothing circuit. The controller controls the main switch based on a first drive signal. The controller turns on the resonant switch during a flyback period when an energy stored in the transformer is released from the secondary winding based on the second drive signal, which causes a resonant current to flow. The controller turns off the resonant switch during an excitation current charging period in which the energy stored in the transformer charges the resonant capacitor after the resonant current stops flowing.

A switching control unit to be applied to a switching power supply apparatus includes a control circuit that controls respective switching operations of switching devices included in at least one of an inverter circuit or a rectifying and smoothing circuit. Based on a result of detection of a current flowing to pass through a capacitive component between a gate and a drain of a first switching device as one of the switching devices that is in an OFF state, the control circuit performs timing setting of a switching timing for the first switching device from the OFF state to an ON state. The switching timing is to come after a shift to a delay time occurring upon switching of a second switching device as another one of the switching devices from an ON state to an OFF state.

To provide a voltage generation circuit capable of setting an output voltage with high resolution.SOLUTION: A voltage generation circuit comprises: a smoothing circuit for receiving an input of a pulse-width modulated signal and outputting voltage obtained by smoothing the pulse-width modulated signal to a first node; a first resistor connected between an output node and a second node; a second resistor connected between the first node and the second node; a third resistor connected between the second node and a ground node; and a voltage control circuit for generating a second voltage based on a first voltage input to an input node, outputting the second voltage to the output node, and controlling the second voltage so that the voltage of the second node becomes a prescribed voltage.SELECTED DRAWING: Figure 1

A switching control unit is applicable to an electric power conversion apparatus. The electric power conversion apparatus includes: a transformer; an inverter circuit including first switching devices; a synchronous rectifying circuit including second switching devices serving as rectifying devices; and a smoothing circuit. The switching control unit includes: a first current detection circuit detecting a peak current value of a secondary current; a second current detection circuit detecting an output current value; and a control circuit controlling respective operations of the first switching devices of the inverter circuit and respective operations of the second switching devices of the synchronous rectifying circuit. The control circuit sets a timing of switching from an on-state to an off-state of each of the second switching devices based on the peak current value detected by the first current detection circuit and the output current value detected by the second current detection circuit.

A switching power supply apparatus includes: a pair of input terminals; a pair of output terminals; a transformer; an inverter circuit including first and second switching devices, first and second rectifying devices as voltage clamping devices, a resonant inductor, and a resonant capacitor; a rectifying and smoothing circuit; a current detector detecting whether a current is flowing through at least one of the first rectifying device or the second rectifying device; and a driver performing switching driving. The resonant capacitor is disposed between a second node and one of a pair of coupling lines. The driver performs switching driving to cause both the first and second switching devices to be set to an OFF state in a case where the current detector detects that a current is flowing through the at least one of the first rectifying device or the second rectifying device.

To obtain a power conversion device capable of effectively performing a drooping operation and recovery from the drooping operation.SOLUTION: A power conversion device according to one embodiment of the present disclosure includes a switching circuit, a transformer, a current sensor, a rectifier circuit, a smoothing circuit, a first voltage sensor and a control circuit. The control circuit can generate a first value, can generate a second value based on the first value, can generate the second value based on an upper limit if the first value is higher than the upper limit, can generate a slope signal having a signal value that decreases from the second value, and can control a switching operation at a timing based on a result of comparison between the slope signal and a signal according to a peak current. When load current increases, the control circuit can decrease a switching frequency of the switching circuit from a predetermined frequency and can increase the upper limit, if a detected voltage becomes lower than a first threshold voltage.SELECTED DRAWING: Figure 1

To prevent occurrence of conduction abnormality resulting from repetition of input and interruption of AC voltage in short time with a simple configuration.SOLUTION: A power supply circuit 6 comprises a full-wave rectification circuit 62, a smoothing circuit 63, a first half-wave rectification circuit 66a, a second half-wave rectification circuit 66b, a third half-wave rectification circuit 66c, a voltage conversion circuit 64 and a control circuit 68. The voltage conversion circuit 64 operates when a voltage level of an AC detection line L3 as an output line of the third half-wave rectification circuit exceeds a first reference level and converts primary voltage as output voltage of the smoothing circuit 63 into DC secondary voltage. The control circuit 68 transmits output voltage of the first half-wave rectification circuit 66a to the AC detection line L3 when the secondary voltage is less than a second reference level based on the voltage level of the AC detection line L3 and stops transmission of the output voltage of the first half-wave rectification circuit 66a to the AC detection line L3 when the secondary voltage is less than the second reference level.SELECTED DRAWING: Figure 2

To provide a power supply circuit that can achieve a high noise suppression effect with a relatively simple configuration, and a motor unit having the power supply circuit.SOLUTION: In a motor unit, a power supply circuit 2 for converting an AC input into a DC output includes a first capacitor 30, a common mode choke coil 10 having magnetically coupled first coil 11 and second coil 12, one end of each of the coils being electrically connected to an AC input, a rectifier circuit 60 that is electrically connected to the other end of each of the coils and rectifies the AC input into a DC output, a smoothing circuit 70 for smoothing the DC voltage output from the rectifier circuit through a pair of wires, a second capacitor 90, and a body earth terminal P5 that is electrically connected to an external metal member. The first capacitor is electrically connected between one end of the first coil and one end of the second coil, and the second capacitor is electrically connected between one wire of a pair of wires L3 and L4 and the body earth terminal, the one wire having lower potential than the other wire.SELECTED DRAWING: Figure 2

To provide a contactless power supply system that can determine whether a target power can be transmitted before initiation of power transmission and can minimize the time it takes for the transmitted power to reach the target power after the initiation of power transmission.SOLUTION: A contactless power supply system C1 transmits the power contactlessly from a power transmission device A to a power reception device B. The power transmission device A comprises: a high-frequency power source device 1; a power transmission unit 2 to which a high-frequency power is input; and a control device 5 that controls the high-frequency power source device 1. The power reception device B comprises: a power reception unit 3; and a rectification and smoothing circuit 4 that outputs a DC power by rectifying the high-frequency power, which is received from the power transmission unit 2 by the power reception unit 3. The power reception device B supplies a power storage device D with the DC power output by the rectification and smoothing circuit 4. Before initiation of power transmission of a charging power to the power storage device D, the control device 5 causes the high-frequency power source device 1 to output a test power, which is lower than the charging power, thereby determining an optimal frequency fx of the high-frequency power output by the high-frequency power source device 1 in order to allow the power reception device B to output a target power.SELECTED DRAWING: Figure 1

According to the circuit multi-physical-quantity acquisition device based on the multiple anti-interference design, the push-pull circuit is arranged between the slave control MCU and the ST polling switching array, and the driving capacity and the anti-interference capacity of switching control are enhanced. A feedback variable resistor R6 is connected in series between the output end and the inverted input end of an operational amplifier U1, and a sensor is connected to the inverted input end of the operational amplifier U1, so that a direct-current equivalent path crossing the sensor is formed, and the output of the sensor and the output voltage of the operational amplifier U1 are in proportional relation. And operational amplifier oscillation caused by long-line distributed capacitance and inductive coupling is suppressed through the phase-shifting network. And through the phase change smoothing circuit, the high-frequency noise in the output voltage of the anti-interference acquisition circuit is further suppressed. And through the second-order series RC low-pass filter, the suppression capability of the device on line harmonic waves and electromagnetic interference is enhanced. The effective value of the output voltage of the anti-interference acquisition circuit is set between Vcc and GND through the clamping protection device G1, and the reliability and the anti-interference capability of the whole circuit are improved.

To provide a power unit which includes a voltage doubler rectifying / smoothing circuit by which fixed output voltage is obtained irrespective of input voltage and setting of the output voltage can be easily changed.SOLUTION: A transformer comprises a winding 26 for voltage generation where a ground terminal 26g is connected with a first ground line 36, and in an oscillation terminal 26s, rectangular wave voltage Vs oscillating in a positive direction and a negative direction based on the first ground line 36 is generated. A power unit comprises an auxiliary switch 56 inserted into a position in series with a coupling capacitor 32a of a voltage doubler rectifying / smoothing circuit 32. The power unit comprises a switch control circuit 58 which performs control for holding the auxiliary switch 56 in an off state at least in a specific period of a period Tb in which the rectangular wave voltage Vs oscillates in the negative direction. Rise of both end voltage Vc of the coupling capacitor 32a to the fixed or higher level is inhibited and output voltage Vo3 generated in a smoothing capacitor 32d of the voltage doubler rectifying / smoothing circuit 32 is held at a target value Vr by the control of the switch control circuit 58.SELECTED DRAWING: Figure 1

An energy supply unit 50 mounted on a swivel joint is provided, wherein the energy supply unit contains: a rotary transformer 53, which is connected to an upper oscillating body ora lower chassis body of a work vehicle; a vibration circuit 52, which is coupled to the upper vibration body, converts electrical energy into an alternating current and supplies the alternating current to the rotary transformer; and a smoothing circuit 54, which is coupled to the lower chassis body and converts the electrical energy output by the rotary transformer 53 into a direct current, wherein an electrode on a negative side of the smoothing circuit 54 is electrically coupled to a housing of the lower chassis body and an electrode on a positive side of the smoothing circuit 54 is led out of a lower section of the swivel joint via a cable which is inserted through a tube 21 provided inside the swivel joint along an axial direction.

An underground utility locator is provided. The underground utility locator includes a wand, a GNSS module, a power module, a smoothing circuit, and a multi-layer enclosure. The wand has a top end and a bottom end and includes at least one antenna configured to output a field strength signal in response to an electromagnetic field. The GNSS module is coupled to the top end of the wand. The power module is coupled to the wand. The multi-layer enclosure at least partially surrounds the GNSS module and includes an outer shell layer and an inner shell layer. The outer shell layer and the inner shell layer are partially separated by an air gap.

The present application provides a liquid ejection device and a print head that can solve problems caused by the temperature detection unit provided inside the print head. The liquid ejection device includes a drive signal output circuit that outputs a drive signal and a print head that receives the drive signal and ejects a liquid, the print head including a temperature detection unit that detects temperature information of a pressure chamber, the drive signal output circuit including a modulation circuit that outputs a modulation signal, an amplification circuit that outputs an amplified modulation signal, a smoothing circuit that outputs a drive signal after smoothing the amplified modulation signal, and a basic drive signal output circuit that outputs a basic drive signal after correction based on the temperature information, the frequency of the amplified modulation signal when the temperature information that the basic drive signal output circuit uses to correct the basic drive signal is detected by the temperature detection unit being higher than the frequency of the amplified modulation signal when the temperature information that the basic drive signal output circuit does not use to correct the basic drive signal is detected by the temperature detection unit.

To provide a contactless power supply system that can determine whether a target power can be transmitted before initiation of power transmission and can minimize the time it takes for the transmitted power to reach the target power after the initiation of power transmission.SOLUTION: A contactless power supply system C1 transmits the power contactlessly from a power transmission device A to a power reception device B. The power transmission device A comprises: a high-frequency power source device 1; a power transmission unit 2 to which a high-frequency power is input; and a control device 5 that controls the high-frequency power source device 1. The power reception device B comprises: a power reception unit 3; and a rectification and smoothing circuit 4 that outputs a DC power by rectifying the high-frequency power, which is received from the power transmission unit 2 by the power reception unit 3. The power reception device B supplies a power storage device D with the DC power output by the rectification and smoothing circuit 4. Before initiation of power transmission of a charging power to the power storage device D, the control device 5 causes the high-frequency power source device 1 to output a test power, which is lower than the charging power, thereby determining an optimal frequency fx of the high-frequency power output by the high-frequency power source device 1 in order to allow the power reception device B to output a target power.SELECTED DRAWING: Figure 1

The invention relates to a light emitting diode (LED) short circuit detection circuit and an LED system including the same. A light emitting diode (LED) short circuit detection circuit includes: a first smoothing circuit configured to receive a first LED driving voltage applied to a first end of an LED string and smooth the first LED driving voltage; a second smoothing circuit configured to receive a second LED driving voltage applied to a second end of the LED string and smooth the second LED driving voltage; an amplifier configured to amplify a difference between the first smoothed voltage output from the first smoothing circuit and the second smoothed voltage output from the second smoothing circuit to output a detection voltage; and a short circuit determination circuit configured to compare the detection voltage with a predetermined reference voltage to output a short circuit signal indicating whether a short circuit has occurred.

The present invention is provided with: a phase comparison circuit that detects a phase difference between a reference clock signal and a feedback clock signal based on an output clock signal; a conversion circuit that outputs a current corresponding to the phase difference; a smoothing circuit that smooths the output of the conversion circuit and outputs the smoothed output as a control voltage; a correction signal generation circuit that generates a correction signal corresponding to the fluctuation of the control voltage on the basis of the control voltage; and a voltage control oscillation circuit that outputs, as the output clock signal, a clock signal of a frequency corresponding to the control voltage and the correction signal. The correction signal generation circuit generates the correction signal using a plurality of resistance elements whose characteristics fluctuate in a direction opposite to the fluctuation of the control voltage with respect to the factor of the fluctuation of the control voltage.

A mechanism for selectively suppressing or allowing ripples to enter an output DC power for driving an LED lighting device. Occupancy information is obtained and used to control the activation and deactivation of a smoothing circuit that attenuates ripples in the output DC power.

The present invention discloses a furnace power supply apparatus for the supply of an electric arc furnace or a submerged arc-resistance furnace with electric energy, —wherein the furnace power supply apparatus is connectable to a three-phase power network, —wherein the furnace power supply apparatus is connectable to at least one electrode of the electric arc furnace or the submerged arc-resistance furnace, —wherein the furnace power supply apparatus comprises: —a three-phase transformer with a primary circuit per phase and a secondary circuit per phase, in particular exactly one secondary circuit per phase, —a rectifier circuit, and—preferably a smoothing circuit zoo connected to the rectifier circuit, —and wherein the three-phase transformer is a phase-shifting transformer.

A power supply circuit includes a transformer having a primary winding and secondary windings, a first power conversion circuit configured to convert a DC voltage into an AC voltage and output the AC voltage to the primary winding, a rectifying and smoothing circuit that is connected to the secondary winding and is configured to rectify and smooth an alternating current output from the secondary winding, and a second power conversion circuit configured to boost a direct current output from the rectifying and smoothing circuit and supply to a load a DC voltage lower than a rated voltage of the load set in advance.

The invention discloses a half-cycle time sequence repairing method and system of a circuit delay locked storage device. The method comprises the following steps: detecting whether installation time violation or holding time violation exists in the digital circuit design or not; when the time sequence violation exists and cannot be conventionally repaired, verifying whether the time sequence margin of the violation path meets a calling condition or not; if yes, part of clock cycle time is called through the barrier-free passing characteristic of the circuit delay lock storage device in the high-level stationary circuit period, and half-cycle cycle time calling repair based on the circuit delay lock storage device is carried out on a violation path, specifically, for installation time violation, an end device is replaced; for holding time violation, a reverse trigger device is inserted. Through the half-cycle period time calling and differentiation strategy, the technical bottleneck of a traditional method is broken through, and a final solution is provided for time sequence violation which cannot be repaired by a conventional method in an extreme design environment.

When a DC power supply is connected to a single-phase power supply or a single-phase load via a DC-AC converter, extremely large power pulsations occur. Therefore, electrolytic capacitors, which can provide large capacitance, are widely used in smoothing circuits in DC power supplies. However, they have major issues with their vulnerability to temperature rise and short lifespan. [Solution] A smoothing capacitor circuit using a film capacitor with few lifespan issues is configured in parallel with the DC power supply circuit via a step-up or step-down DC / DC converter, and significant charge / discharge control of the capacitor is performed using switching control to suppress DC voltage pulsation, thereby realizing a capacitor with an equivalently large capacity and achieving the elimination of electrolytic capacitors.

This suppresses the deterioration of ESR in hybrid-type electrolytic capacitors under low-temperature conditions. [Solution] An electrolytic capacitor is used, for example, in smoothing circuits and filter circuits, and comprises an anode body on which a dielectric film is formed, a cathode body facing the anode body, and an electrolyte interposed between the anode body and the cathode body. The electrolyte contains a conductive polymer and an electrolyte solution. The electrolyte solution contains glycerin accounting for 8 wt% to 55 wt% in the solvent and a polyhydric alcohol accounting for 70 wt% or less. The electrolytic capacitor is manufactured by comprising an anode manufacturing step for producing an anode body, a cathode manufacturing step for producing a cathode body, a solid electrolyte layer formation step for adhering the conductive polymer to the dielectric film by impregnating at least a dispersion of conductive polymer into the dielectric film and drying it, an element formation step for forming a capacitor element, and an electrolyte impregnation step for impregnating the capacitor element with the electrolyte solution prepared in the electrolyte solution preparation step.

To provide a power conversion device capable of suppressing a surge voltage while improving responsiveness to a change in a load.SOLUTION: According to an embodiment of the present disclosure, there is provided a power conversion device including: a transformer including a first power terminal, a switching circuit connected to the first power terminal and including one or more switching elements, a first winding guided to the switching circuit, and a second winding; a capacitor provided in a path connecting the switching circuit and the first winding of the transformer; a current sensor capable of detecting a current flowing through one of the first winding and the second winding; a rectifier circuit connected to the second winding; a smoothing circuit connected to the rectifier circuit; a second power terminal guided to the smoothing circuit; and a control circuit capable of operating one or more switching elements at a predetermined switching period and capable of controlling a switching operation of the one or more switching elements based on a peak current of a current detected by the current sensor.SELECTED DRAWING: Figure 1

To provide an irradiation device having a simple circuit configuration.SOLUTION: An irradiation device 1 includes a connection member 9 for receiving power from a fixture body 51, an LED module 35 for irradiating with ultraviolet light, and a rectifier circuit 11 provided on a conductive path connecting the connection member 9 and the LED module 35, but does not include a smoothing circuit.SELECTED DRAWING: Figure 3

To provide a technique capable of preventing a switching operation of a switching element from being stopped due to a regenerative current.SOLUTION: An electric apparatus comprises: a transformer; a first smoothing circuit; a second smoothing circuit; a feedback circuit; a switching element; a switching control circuit; a motor operated by power from the first smoothing circuit; a motor control circuit operated by power from the second smoothing circuit, and outputting a motor command signal indicating a command value of the number of revolutions of the motor; a motor drive circuit for controlling an operation of the motor according to the motor command signal; an absorption resistor for absorbing a regenerative current from the motor; and a current-limiting circuit for limiting a current flowing through the absorption resistor. The current-limiting circuit is constituted so as to relieve limitation of the current flowing through the absorption resistor, when reducing the command value of the number of revolutions of the motor, which is indicated by the motor command signal.SELECTED DRAWING: Figure 1

This wireless power supply system includes: a transmission device provided with a transmission resonance circuit including a transmission coil and a transmission resonance capacitor; and a reception device that is electrically connected to a load and includes a reception resonance circuit including a reception coil and a reception resonance capacitor. Electromagnetic field resonance coupling is formed by the transmission coil and the reception coil to supply power from the transmission device to the reception device. The transmission device includes a transmission power conversion circuit and a transmission control circuit. The transmission power conversion circuit is electrically connected to an input DC power supply and the transmission coil, converts DC power supplied from the input DC power supply into AC power by switching operation by a semiconductor switching element, and causes the AC current to flow to the transmission coil. The transmission control circuit controls the switching operation of the transmission power conversion circuit. The reception device includes a reception power rectification circuit, a smoothing circuit, and a rectification control circuit. The reception power rectification circuit is electrically connected to the reception resonance circuit, and rectifies the power of the high frequency AC received by the reception coil. The smoothing circuit is electrically connected to the reception power rectification circuit, and smooths the power rectified by the reception power rectification circuit to the reception DC voltage. The rectification control circuit is electrically connected to the reception resonance circuit, and controls execution and stop of the rectification operation of the reception power rectification circuit. The capacitance of the transmission resonance capacitor is equal to or less than the capacitance at which an input impedance seen from the transmission coil to the load side becomes a minimum at the switching frequency, and the capacitance is set so that when the rectification control circuit stops the rectification operation of the reception power rectification circuit and performs power reception cutoff control, the DC current input from the input DC power supply to the transmission device decreases as the coupling coefficient between the transmission coil and the reception coil increases.

The tissue ablation, cutting and fusion system of the present invention includes a handle assembly, a shaft assembly, a working part, a circuit system and a power supply. The circuit system is provided with an elastic electrical interface device, and the elastic electrical interface device includes a conductive joint, an elastic conductive mechanism and an electrical interface. The conductive joint includes a rotor and a stator. When the shaft rotates, the rotor can rotate synchronously, and the circuit connecting the conductive joint and the rear end of the shaft remains synchronized, which can avoid the wire breakage or the loosening of the solder joint caused by the distortion of the circuit. The elastic conductive mechanism is a conductive mechanism that can undergo elastic deformation under the action of external force while maintaining the circuit unobstructed. When the shaft translates, the elastic conductive mechanism undergoes elastic deformation and performs reciprocating motion, which overcomes the fatigue breakage or the loosening of the solder joint caused by the constant expansion and contraction of the wire during the current wire connection. The tissue ablation, cutting and fusion system of the present invention not only maintains the good controllability of the instrument, but also improves the reliability of the circuit.

A power supply device includes an intermittent voltage generation circuit, a rectifying and smoothing circuit, a synchronous rectifier element drive circuit, an abnormality detection circuit, a load current detection circuit, and a protection circuit. The intermittent voltage generation circuit generates an intermittent voltage from an input voltage from an external power supply by a switching element that is repeatedly turned on and off. The rectifying and smoothing circuit rectifies the intermittent voltage by a synchronous rectifier element that is turned on and off in synchronization with on and off of the switching element, smooths the intermittent voltage by a capacitor, and supplies the intermittent voltage to a load. The synchronous rectifier element drive circuit supplies a control signal for turning on and off the synchronous rectifier element to a control terminal of the synchronous rectifier element. The abnormality detection circuit detects an abnormality in the synchronous rectifier element drive circuit. The load current detection circuit detects a load current that is a current of the load supplied by the rectifying and smoothing circuit. The protection circuit performs a protection operation on the basis of a detection result of the abnormality detection circuit and a detection result of the load current detection circuit.