65 results about "Smoothing circuits" patented technology

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

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

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.

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.

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 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

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.

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.

This prevents the control circuit from immediately shutting down when the power supply from the AC power source is interrupted. [Solution] The power control device is a power control device 3 for an electrical device, comprising: a first rectifier-smoothing circuit 30 including a first smoothing capacitor 201 and connected between an AC power supply 4 and a load 35; a second rectifier-smoothing circuit 31 including a second smoothing capacitor 202 and connected between an AC power supply 4 and a first control circuit 36 ​​that controls the load 35; and a bypass circuit 32 connected between the output side of the first rectifier-smoothing circuit 30 and the output side of the second rectifier-smoothing circuit 31.

To prevent a switching control section from being adversely affected even when a lightning surge is input to a low-voltage rated line. [Solution] The image forming device (1) includes a rectifying and smoothing circuit (112) that rectifies an AC voltage from which noise has been removed by a noise filter (Lc) and outputs the rectified voltage to a primary winding (L1) of a transformer (111); a switching control unit (121) that performs switching control; a power supply line (201) that is connected between the rectifying and smoothing circuit (112) and the primary side of the transformer (111) and inputs a high-voltage power supply voltage to a fourth terminal (VIN) of the switching control unit (121); a detection line (300) that is connected between the noise filter (Lc) and the rectifying and smoothing circuit (112), intersects with the power supply line (201), and inputs a low-voltage voltage to a fifth terminal (LS) of the switching control unit (121); and a first resistor (R10) that is connected between an intersection (500) of the detection line (300) with the power supply line (201) and a fifth terminal (LS) of the switching control unit (121) and drops the voltage input to the fifth terminal (LS).

An electric power conversion apparatus includes: an input power terminal; a switching circuit; a first driving circuit configured to perform a first driving operation of driving the switching circuit, and configured to stop the first driving operation, based on a first driving control signal; a transformer including first and second windings; a rectifying circuit configured to rectify a signal supplied from the second winding and including a first rectification switching device turning on and off based on a first driving signal; a second driving circuit configured to perform a second driving operation that includes driving the first rectification switching device through the first driving signal, and configured to stop the second driving operation based on a second driving control signal; a signal generation circuit configured to generate the first driving control signal, based on a control signal and the first driving signal; a smoothing circuit; and an output power terminal.

The present invention provides a power supply device that allows for easy determination of the connection status of a heating resistor before reducing the pressure inside an airtight container. [Solution] The power supply unit 1A has a power conversion circuit 3A having a modulation circuit 4 that modulates a first power which is DC power and converts it into a second power, and a rectifier and smoothing circuit 5 that converts the second power into a third power which is DC power, a heating resistor 61 to which the third power is supplied, a modulation control circuit 7A that outputs modulation circuit drive signals Sg1 to Sg4 that control the modulation circuit 4, and a current detection signal S that detects the magnitude of the load current If supplied by the power conversion circuit 3A to the heating resistor 61. If The modulation control circuit 7A comprises a load current detection unit 8 that generates a current detection signal S If Based on this, the drive frequencies of the modulation circuit drive signals Sg1 to Sg4 are controlled so that the magnitude of the load current If approaches the target value of the load current If. The modulation control circuit 7A determines the electrical connection state between the power conversion circuit 3A and the heating resistor 61 based on the drive frequency.

Servo drive (1) for controlling the operation of a servo motor, comprising: a capacitor (27) forming a smoothing circuit of an inverter and having a substantially cylindrical external shape; a container body (21) in which the capacitor (27) is stored; and a housing (10) that accommodates the capacitor (27) and the container body (21), wherein the housing (10) comprises a lid body (11) which includes a section in which a closure section (14) is provided, and a box body having an opening, closed by the lid body (11), wherein the container body (21) has an essentially box-like shape, which is formed by being provided with an opening section (21a) that makes it possible to insert and remove the capacitor (27) in relation to the container body (21) along a direction orthogonal to an axial direction of the capacitor (27), wherein the container body (21) is mounted on the box body of the housing (10) such that the opening section (21a) is covered by the closing section (14), which is part of the housing (10), and wherein the capacitor (27) is sandwich-like enclosed and held between the closure section (14) and a bottom section (21b) of the container body (21) which is arranged on a side opposite the side with the opening section (21a), wherein the capacitor (27) is elastically prestressed against the bottom section (21b) by a damping material (40) which is elastically deformable and is arranged between the closure section (14) and the capacitor (27).

To acquire a washing machine which can suppress a rush current which flows at the moment when supply of a drive power source starts from an AC power source to a load.SOLUTION: A washing machine includes: a load for performing an operation regarding washing; and a power source control part for controlling the supply of drive power source from an AC power source to the load. The power source control part includes: a first rectifying and smoothing circuit containing a first smoothing capacitor connected between the AC power source and the load; a first switching circuit for switching conduction or cut-off of a first connection path for connecting the AC power source and the first rectifying and smoothing circuit; a phase detection circuit for detecting the phase of an AC voltage which the AC power source outputs; and a first control circuit. The first control circuit conducts the first connection path to the first switching circuit at zero-cross timing of the AC voltage, based on the phase detected by the phase detection circuit.SELECTED DRAWING: Figure 2

The invention discloses an insulated inverter system and method for dynamic load condition optimization. The insulated inverter system comprises an insulated DC-DC converter and a DC-AC inverter. The insulated DC-DC converter comprises a PWM control chip, a switch element, a high-frequency transformer and an optical coupler. The output of the high-frequency transformer is rectified and filtered to generate direct-current voltage; a feedback signal extracted from the DC voltage is applied to the PWM integrated circuit chip through the optical coupler to form a feedback path, and a smoothing circuit used for filtering DC voltage impurities is added to a light emitting part or a light receiving part of an optical coupler driving circuit in the feedback path so as to optimize a transmission path of the PWM control feedback signal. According to the system and the method, the stability and the reliability of the system are remarkably improved, meanwhile, the electric shock risk is reduced, and an effective solution is provided for productization of the inverter system and development of market requirements.

Provided are a semiconductor integrated circuit and an electronic device capable of achieving both high quality and high-speed startup. A semiconductor integrated circuit according to an embodiment generates a first voltage of a first value, and includes: a first circuit capable of outputting a first current based on the first voltage; a second circuit capable of outputting a second current greater than the first current and based on the first voltage; a smoothing circuit having a capacitor and capable of smoothing the output of the first circuit; a third circuit capable of outputting a third current on the basis of the first voltage; and a control circuit capable of outputting a first current from the first circuit and a second current from the second circuit to the capacitor in parallel, stopping the output of the second current to the capacitor after a first time has elapsed since the output of the second current to the capacitor, and stopping the output of the second current to the capacitor after a second time longer than the first time has elapsed from stopping the output of the second current to the capacitor. A third current is output from the third circuit.

A current detection circuit includes a current detection resistor of which a first end is connected to a ground potential, a PWM signal generation circuit configured to output a PWM signal, a smoothing circuit configured to generate a smooth voltage by smoothing the PWM signal, and an amplifier circuit configured to amplify a voltage generated at a second end of the current detection resistor. The amplifier circuit is a grounded-base circuit or a grounded-gate circuit. A control terminal of a first transistor included in the grounded-base circuit or the grounded-gate circuit is configured to receive a voltage that is based on the smooth voltage.

This lighting device includes a light source device having a light source, and a light distribution device. The light distribution device includes: an optical element including at least one liquid crystal cell on the light source; a control device; a smoothing circuit; a shift register; and a light distribution power supply circuit. The light distribution power supply circuit is configured to input, to the shift register and the smoothing circuit, a light distribution control signal based on a pulse width modulation method for designating the degree of diffusion of light from the light source by the optical element. The control device is configured to supply an output signal based on a pulse amplitude modulation method to at least one liquid crystal cell on the basis of the light distribution control signal processed by the shift register.

A power conversion device includes a power conversion circuit, a smoothing circuit including output capacitors, a positive-side conductor having a bent structure, and a negative-side conductor, a positive-side output terminal, a negative-side output terminal, and a substrate having first and second substrate connecting parts. The output capacitors are mounted on the substrate, an end of each of the output capacitors is connected to the positive-side conductor at a first substrate connecting part and the other end of it is connected to the negative-side conductor at a second substrate connecting part. The output capacitors include first and second capacitors, the shortest distance between the first and second substrate connecting parts is shorter than an inter-terminal length of the first capacitor and longer than that of the second capacitor, and the second capacitor is mounted between the first and second substrate connecting parts.

The application discloses a pulse width detection circuit and an inductive displacement sensor, and comprises an oscillation circuit, a coil resonance circuit and a modulation circuit; the output end of the oscillation circuit is connected with the input end of the coil resonance circuit, and the output end of the coil resonance circuit is connected with the modulation circuit; the oscillation circuit is used for generating a driving square wave signal and outputting the driving square wave signal to the coil resonance circuit; the coil resonance circuit is used for generating a sine wave signal with the same frequency as the driving square wave signal and outputting the sine wave signal to the modulation circuit; and the modulation circuit is used for converting the sine wave signal into a pulse width modulation signal with a pulse width being proportional to a measured displacement. The application converts the amplitude variation of a probe sine wave into a pulse width modulation wave to improve the signal-to-noise ratio and the anti-interference capability of the inductive displacement sensor detection, and only an RC integral smoothing circuit and a normalization circuit are needed to regulate the required signal of a user.

The invention provides a capacitive load driving circuit and a liquid ejecting apparatus, which can reduce the possibility of distortion in the waveform of a driving signal. The capacitive load drive circuit includes: a first digital amplifier circuit that outputs a first amplified signal to a first output node; a bootstrap circuit that includes a capacitor element connected to the first output node and the second output node, and a diode element having an anode terminal connected to the third transmission node and a cathode terminal connected to the second output node, and outputs a start-up voltage signal to the second output node; the second digital amplification circuit is connected with the first output node and the second output node and outputs a second amplification signal to a third output node; a smoothing circuit that smoothes the second amplified signal and outputs the smoothed second amplified signal as a drive signal; and a voltage limiting circuit which is connected with the third transmission node and the second output node and switches the conduction state of the third transmission node and the second output node according to the potential difference between the third transmission node and the second output node.

A semiconductor integrated circuit includes a smoothing circuit, first to third circuits, and a control circuit. The first circuit is configured to cause a first current to flow to the smoothing circuit, to output a first voltage to a first terminal. The second circuit is configured to cause a second current to flow to the smoothing circuit, to output the first voltage to the first terminal. The second current is greater than the first current. The third circuit is configured to cause a third current corresponding to the first current to flow to a second terminal. The control circuit is configured to cause, during a first time period, the first and second currents to flow to the smoothing circuit, then during a second time period, the first current to flow to the smoothing circuit, and then during a third time period, the third current to flow to the second terminal.