37 results about "Smoothing circuits" patented technology

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.

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.

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.

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.

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).

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.

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.

A light-emitting diode (LED) short 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 perform smoothing on 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 perform smoothing on the second LED driving voltage; an amplifier configured to amplify a difference between a first smoothing voltage output from the first smoothing circuit and a second smoothing 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.

This invention discloses a stray light component subtraction circuit for a dust sensor and a dust sensor itself. The stray light component subtraction circuit for a dust sensor includes a smoothing circuit and a DC current application circuit. The smoothing circuit consists of a resistor Ra connected in series with an RC filter composed of a resistor Rb and a capacitor C1 connected in parallel, used to smooth the PWM output of a microcomputer to adjust the control voltage. The DC current application circuit consists of a resistor R2 and a transistor. The input terminal of the transistor is connected to a power supply through resistor R2. The output terminal of the transistor is connected to the signal differential node of any stage amplifier in the dust sensor's amplifier circuit, and the trigger control terminal of the transistor is connected to the output terminal of the smoothing circuit. The purpose of this invention is to eliminate the influence of stray light in the dust sensor, reduce unnecessary signal components caused by stray light, and thus improve the measurement stability and detection accuracy of the dust sensor.

Provided is a power feeding unit mounted on a swivel joint, the power feeding unit including: a rotary transformer that is coupled to an upper swing body and a lower traveling body of a work vehicle, respectively; an oscillation circuit that is coupled to the upper swing body, converts electric power into an alternating current, and supplies the alternating current to the rotary transformer; and a smoothing circuit that is coupled to the lower traveling body and converts electric power output from the rotary transformer into a direct current, in which an electrode on a negative side of the smoothing circuit is electrically coupled to a housing of the lower traveling body, and an electrode on a positive side of the smoothing circuit is taken out from a lower portion of the swivel joint via a cable inserted through a pipe provided inside the swivel joint along an axial direction.

To provide a power conversion device that can discharge the charge of a capacitor without increasing costs or size. [Solution] A power conversion device 10 comprising a main circuit section 11 and a control section 12, wherein the main circuit section 11 comprises a first bridge circuit 14, a first resonant circuit 15, a transformer Tr, a second resonant circuit 16, a second bridge circuit 17, and a smoothing circuit 18 including a capacitor C12, and the control section 12 performs charge discharge control to dissipate the charge of the capacitor C12 in the main circuit section 11, and during charge discharge control, the control section 12 performs freewheel control to control the first switching elements Q1 to Q4 so that a freewheel current flows through the first bridge circuit 14, frequency modulation control to modulate the switching frequencies of the second switching elements Q5 to Q8, and phase shift control to modulate the phase difference between the second switching elements Q5 and Q6 of the third leg and the second switching elements Q7 and Q8 of the fourth leg.

The invention provides a Buck circuit parallel current-sharing current detection method and circuit, and relates to the field of current detection. The method comprises the following steps: collecting current data of a freewheeling tube, and processing the current data through a conditioning circuit to obtain a conditioning signal; synchronously shunting the conditioning signal into a smoothing circuit and an analog-to-digital converter, and respectively outputting an average current signal and an original digital current signal; performing digital domain processing on the average current signal and the original digital current signal through a fusion algorithm, and reconstructing a voltage signal instantaneously equivalent to inductive current; and performing current sharing control on the Buck circuit parallel system based on the voltage signal instantaneously equivalent to the inductive current. The technical problems of high isolation sampling cost, large mutual inductor size, large parasitic parameter influence and dynamic response lag are solved.

To provide an LED lighting device that is less likely to produce weak lighting even when a dimmer is connected. [Solution] The LED lighting device of the present invention is a lighting device used by connecting a dimmer, and comprises a flexible tube and a flexible wiring board housed within the tube. The flexible wiring board is provided with a rectifier circuit that rectifies AC power, a smoothing circuit that smooths the pulsating current rectified by the rectifier circuit, an LED that emits light using DC current supplied by the DC voltage smoothed by the smoothing circuit, and a resistor that reduces the current flowing to the LED when the dimmer is OFF.

A power conversion apparatus includes: a first power terminal; a switching circuit including first switching devices configured to be turned on / off based on a first driving signal; a transformer; a rectifying circuit including second switching devices configured to be turned on / off based on a second driving signal; a smoothing circuit; a second power terminal; and a control circuit. In a first period before electric power is supplied from the first power terminal toward the second power terminal, the control circuit generates a first threshold increasing with the passage of time, and performs, when a voltage value of a voltage at the first power terminal reaches the first threshold, switching from an output state in which the second driving signal is outputted to an output stop state in which output of the second driving signal is stopped, or switching from the output stop state to the output state.

An electronic device (10) relates to energization switching of a rotary electric machine (80) having a plurality of winding sets (180, 280) and comprises a plurality of drive circuits (130, 230), a power supply circuit (40), and a smoothing circuit (45). The drive circuits (130, 230) have a plurality of switching elements (131 to 136, 231 to 236) and are provided for the respective winding sets (180, 280). The power supply circuit (40) is provided between a battery (5) and the drive circuits (130, 230). The smoothing circuit (45) has capacitors (451, 452) connected to the drive circuits (130, 230). The power supply circuit (40) and the plurality of drive circuits (130, 230) are connected to each other by a common power supply unit having a common potential. One electrode of each of the capacitors (451, 452) is connected to the common power supply unit.

The application provides a photosensitive regulation method for backlight brightness and a display device, which are applied to a photosensitive regulation circuit, the photosensitive regulation circuit comprising a photoelectric sensing circuit, an amplification circuit, a smoothing circuit, an analog-digital conversion sampling circuit, a control circuit and a backlight source, and the method comprises the following steps: if the change of ambient light meets a preset condition, the photoelectric sensing circuit outputs an analog signal; the amplification circuit receives and amplifies the analog signal to output an amplified analog signal; the smoothing circuit receives the amplified analog signal and smoothes the change direction of the amplified analog signal; the analog-digital conversion sampling circuit samples in a preset sampling mode within the time of the change direction of the smoothed amplified analog signal, converts the amplified analog signal into a digital signal; and the control circuit receives the digital signal, adjusts the brightness of the backlight source in a preset regulation mode based on the digital signal. When the ambient light changes, the human eye is more easily adapted to the change of the brightness of the backlight, and the experience of the change of the display brightness of the liquid crystal display device is improved.

The application discloses a power dynamic distribution device for multi-station parallel test, which comprises a body, a time slice demand prediction controller, a high-frequency resonance pulse generation circuit, a solid-state synchronous guide matrix and a local transient smoothing circuit arranged in the body, and a anti-loose pressing mechanism arranged at the rear end of the body. The time slice demand prediction controller reads a test vector sequence before a measured chip executes an instruction, and calculates a transient current demand prediction value. The high-frequency resonance pulse generation circuit converts a direct current voltage into a high-frequency alternating resonance current. The solid-state synchronous guide matrix switches a state at a zero-crossing point of the alternating current, cuts the current into a high-frequency discrete pulse sequence, and feeds forward the high-frequency discrete pulse sequence into the local transient smoothing circuit. The local transient smoothing circuit restores the pulse sequence into a direct current voltage, and completes charge pre-charging before a load mutation. The anti-loose pressing mechanism locks a communication wire harness. Through the feedforward pulse injection and a soft switching mechanism, the application eliminates voltage drop caused by concurrent test.

The invention relates to a power supply (100) and its control method, a heating device (1000), and a microwave cooking device. The power supply (100) includes a rectifier and smoothing circuit (10), an inverter circuit (20), and a processing circuit (30). The inverter circuit (20) includes a transformer (21) and a switching element (22) connected to a primary coil (211), and the secondary coil (212) is connected to a magnetron (200). The rectifier and smoothing circuit (10) is connected to an AC power supply (300), and the primary coil (211) is connected to the rectifier and smoothing circuit (10). The processing circuit (30) controls the on / off state of the switching element (22), and if the detected electrical parameters of the switching element (22) meet preset conditions, it determines that the magnetron (200) is overheated and adjusts the electrical parameters so that the magnetron (200) is not overheated.

An electric power conversion apparatus includes: first and second electric power terminals; a switching circuit; a transformer; a rectifying circuit; a smoothing circuit including a first inductor and a first capacitor; an electric power regeneration circuit; and a control circuit. The electric power regeneration circuit includes: a first diode including an anode coupled to the rectifying circuit, and a cathode coupled to a first node; a second capacitor having one end coupled to the first node and another end coupled to a reference node; a first regeneration switching device having one end coupled to the first node and another end coupled to a second node; a second regeneration switching device having one end coupled to the second node and another end coupled to the reference node; and a second inductor and a second diode provided on a path coupling the second node and the one end of the first capacitor.

An electric power conversion apparatus includes: a first electric power terminal including two coupling terminals; a voltage sensor detecting a voltage between the two coupling terminals; a switching circuit coupled to the first electric power terminal; a transformer including a first winding coupled to the switching circuit, and a second winding; a rectifying circuit coupled to the second winding; a smoothing circuit; a second electric power terminal; and a control circuit. The control circuit causes the rectifying circuit to supply electric power from the second electric power terminal toward the first electric power terminal in a second period that precedes a first period during which electric power is supplied from the first electric power terminal toward the second electric power terminal, and detects a short circuit between the two coupling terminals by comparing the voltage detected by the voltage sensor with a predetermined threshold voltage, in the second period.

The present invention relates to an isolated inverter system optimized for dynamic load conditions. In order to prevent an abnormal phenomenon from occurring in the inverter system depending on load characteristics of an electric motor or the like, in a converter comprising a PWM IC chip, a switching element, a high-frequency transformer, and a photocoupler, the high-frequency transformer outputs a direct current voltage (Vout) through a secondary rectification stage and a smoothing operation of a capacitor, a feedback path is set such that a signal extracted from the direct current voltage (Vout) is applied to the PWM IC chip through the photocoupler, and a smoothing circuit for refining the extracted signal is added to the feedback path. According to the present invention, an inverter system having a structure in which an inverter is connected to an isolated DC-DC converter can be safely operated even under dynamic load conditions, and the risk of electric shock can be greatly reduced even if there is body contact with an output system of the inverter system.

To provide a power conversion device capable of effectively diagnosing a voltage detection circuit.SOLUTION: A power conversion device according to an embodiment of the present disclosure includes a first power terminal, a first switching circuit, a first transformer, a first rectifier circuit, a smoothing circuit, a second power terminal, a voltage detection circuit capable of applying a predetermined voltage to a second node in a signal path connecting an input node connected to a first node in the power conversion device and an output node from which a voltage corresponding to a voltage at the first node is output, and a control circuit. The control circuit is capable of controlling the switching operation so as to supply power from the second power terminal toward the first power terminal in a second period before the first period, is capable of controlling an operation of the voltage detection circuit so as to apply a predetermined voltage to the second node in a third period before the second period, and is capable of diagnosing the voltage detection circuit based on a voltage of the output node of the voltage detection circuit in the third period.SELECTED DRAWING: Figure 1