120 results about "Switching power converter" patented technology

A method is disclosed for estimating an accumulated fatigue damage of a switching power converter. The switching power converter has power modules each including a first semiconductor device. The method includes determining of the plurality of power modules, a single power module having the first semiconductor device being thermally most heavily stressed. During operation of the switching power converter, a reference temperature is measured related to a temperature of at least the single power module. A current of the switching power converter is determined, particularly a current representative of a power dissipation through the first semiconductor device. A single fatigue damage of the first semiconductor device of the single power module is calculated based at least on the current and the reference temperature. A switching power converter may have a processing unit configured to implement the above method.

The invention belongs to the technical field of electronic circuits, and provides a negative voltage charge pump circuit, a switching power supply converter and electronic equipment. A reference voltage generation module, a comparison module, a fourth driving module, a fifth power tube, a sixth power tube and a seventh power tube are additionally arranged on an existing charge pump. The reference voltage generation module is used for generating third reference voltage, namely threshold voltage when the negative-voltage charge pump circuit enters the light load, then the comparison module is used for comparing the third reference voltage with error voltage output by the error amplifier, and whether the negative-voltage charge pump circuit enters the light-load working condition or not is judged; when the negative-voltage charge pump circuit enters a light-load working condition, the large-size power tube and the driving module thereof are closed, and only the small-size power tube works, so that other performances of the negative-voltage charge pump circuit are ensured, the working current of the negative-voltage charge pump circuit in the light-load state is greatly reduced, and the working efficiency of the negative-voltage charge pump circuit is improved. Therefore, the conversion efficiency of the charge pump circuit in light load is improved.

An integrated circuit is provided for driving the gate of a GaN power switch transistor in a switching power converter. During a first portion of an on-time period for the GaN power switch transistor, the integrated circuit charges the gate through a relatively high pull-up resistance. During a second portion of the on-time period, the integrated circuit charges the gate through a relatively low pull-up resistance. During a first portion of an off-time period for the GaN power switch transistor, the integrated circuit discharges the gate through a relatively low pull-down resistance and then discharges the gate through a relatively high pull-down resistance in response a voltage of the gate falling below a threshold voltage.

A semiconductor die for an inductor-based switching power converter includes a semiconductor layer stack, a first enhancement mode, N-channel metal oxide semiconductor field effect transistor (first NMOS FET) formed in the semiconductor layer stack, a second enhancement mode, N-channel metal oxide semiconductor field effect transistor (second NMOS FET) formed in the semiconductor layer stack, first driver circuitry formed in the semiconductor layer stack, second driver circuitry formed in the semiconductor layer stack, and bootstrap capacitance. The first driver circuitry is configured to drive the first gate from a bootstrap power rail in response to a first control signal, and the second driver circuitry is configured to drive the second gate in response to a second control signal. The bootstrap capacitance includes one or more bootstrap trench capacitors formed in the semiconductor layer stack, and each bootstrap capacitor is electrically coupled between the bootstrap power rail and the switching node.

The invention belongs to the technical field of power management, and particularly relates to an ultrasonic mode control circuit for limiting the lower limit of light load switching frequency. According to the invention, an ultrasonic mode control circuit is designed, and the ultrasonic mode control circuit is nested in the switching converter as an independent circuit and can monitor the switching period. When the switching period is close to the audio frequency range, the DCM state is forcibly quitted, and the flip point of the ZCD is adjusted through the loop to enable the inductive current to flow backward, so that the circuit balance is realized. According to the invention, the problem of noise interference of the current switching power supply converter in an extremely light load state is solved from the source. As the system load is gradually reduced, the circuit switching frequency is gradually reduced so as to improve the conversion efficiency. When the switching frequency is reduced to a designed lower limit threshold, the frequency is stable and does not continue to be reduced. The system has the advantages of a current mainstream control mode for improving light load efficiency, and solves the problem of noise during extremely light load.

A power factor correction (PFC) control circuit includes a pulse-width modulation (PWM) circuit configured to control a switch of a switching power converter. The PFC control circuit further includes a mode control circuit configured to select a conduction mode from a plurality of conduction modes for the switching power converter based at least in part on an output power of the switching power converter and to control a beginning of a switching cycle of the switching power converter based on the selected conduction mode. In addition, the PFC control circuit includes a current regulation circuit configured to provide a regulation signal to the PWM circuit to regulate an average coil current of the switching power converter in each of the plurality of conduction modes.

The invention relates to the technical field of semiconductors, and discloses a capacitive switching power converter packaging structure and a preparation method thereof, the packaging structure comprises an IPD wafer and an SCVR layer, the IPD wafer comprises a plurality of DTC chip first dielectric layers; the surface of each DTC chip comprises a plurality of first metal bonding pads; the first metal bonding pad is exposed on the surface of the IPD wafer; the SCVR layer comprises at least one SCVR chip; the SCVR chip comprises a plurality of second metal bonding pads and a second dielectric layer, and the second metal bonding pads and the second dielectric layer are located on the surface of one side of the IPD wafer; the IPD wafer and the SCVR layer are connected into an integrated structure through hybrid bonding, the first dielectric layer and the second dielectric layer are in contact and bonding connection, and the first metal bonding pads and the second metal bonding pads are in one-to-one correspondence contact and bonding connection. According to the packaging structure, the occupied area of the DTC capacitor can be reduced, the size of the packaging structure is reduced, and the integration level, stability and reliability of the packaging structure are improved.

The utility model discloses a switching power supply controller and a switching power supply converter. Comprising a switch control circuit, a drive circuit, a start control circuit and a delay circuit. The starting control circuit is used for sampling a direct-current input voltage to obtain a first sampling signal taking a second reference ground as a benchmark, converting the first sampling signal into a second sampling signal taking the first reference ground as the benchmark, and generating an effective starting indication signal when the second sampling signal is greater than a set threshold voltage; and the control circuit is used for delaying preset time to control the switch control circuit to enable to be started after receiving the effective starting indication signal. Through the design, it is ensured that the switching power supply converter starts to work after surge current limiting of the preceding-stage controller is finished, the system cost is reduced, the reliability and stability of the system are improved, and normal starting and running of the power supply converter are ensured.

A molded inductor includes a winding having leads configured for attaching leads of the winding to pads on a package substrate, having a magnetic core with a body disposed within the winding, wherein the magnetic core has at least one mold flow enhancing feature that enhances a filling of a magnetic mold material as compared to a filling provided by a uniform cylindrical body. The magnetic mold material encases the winding and the magnetic core to form either a standalone discrete inductor component, or the magnetic component of an output filter of an integrated switching power converter module.

A method for operating a switching power converter to reduce ripple current magnitude includes (a) controlling duty cycle of a plurality power stages of the switching power converter to regulate at least one parameter of the switching power converter, each power stage including a respective power transformer, and (b) controlling an injection stage of the switching power converter to reduce voltage across leakage inductance of each power transformer, the injection stage including an injection transformer that is electrically coupled to a respective secondary winding of each power transformer.

The invention relates to an operation mode control technique for a power factor correction circuit. A power factor correction (PFC) control circuit includes a pulse width modulation (PWM) circuit configured to control a switch that switches a power converter. The PFC control circuit also includes a mode control circuit configured to select a conduction mode from a plurality of conduction modes for the switching power converter based at least in part on an output power of the switching power converter, and controlling a start of a switching cycle of the switching power converter based on the selected conduction mode. Further, the PFC control circuit includes a current regulation circuit configured to provide a regulation signal to the PWM circuit to regulate an average coil current of the switching power converter in each of the plurality of conduction modes.

The invention relates to the technical field of semiconductors, and provides an impact negative charge driving circuit for suppressing crosstalk and a switching power supply converter, and the circuit comprises a driving module and an impact negative charge module. A first end of the driving module receives an input signal, and a second end of the driving module is connected with a grid node of the silicon carbide MOSFET and is used for controlling on and off of the silicon carbide MOSFET according to the input signal; a first end of the impact negative charge module receives an input signal, a second end of the impact negative charge module is connected with a power supply end, a third end of the impact negative charge module is connected with a ground end, and a fourth end of the impact negative charge module is connected with a grid node of the silicon carbide MOSFET. When the drain voltage of the silicon carbide MOSFET rises to cause the Miller current to flow backward to the gate node, negative charges are released to the gate node to neutralize the Miller current. Efficient crosstalk suppression is achieved through a physical mode of charge neutralization, dependence on a continuous negative voltage power supply is not needed, the system architecture is simplified, and the cost is reduced.

System which includes the following: a peak current mode controller for controlling the cycle operation of a power switch in a switching power converter for controlling an output voltage to a nominal value, wherein the peak current mode controller includes a comparator (520) to generate a turn-off command in response to a comparison of a multiplied fault signal with a signal (Isense) representing an input current into an AC / DC power converter; an upper threshold voltage (VOUT-limit) matching circuit (530) configured to increase an upper threshold voltage (VOUT-limit) in response to an increase in a voltage ripple between the output voltage and the nominal value, wherein the upper threshold voltage (VOUT-limit) matching circuit (530) is further configured to decrease the upper threshold voltage in response to a decrease in the voltage ripple; a lower threshold voltage (VOUT lower limit) matching circuit (535) configured to decrease a lower threshold voltage (VOUT lower limit) in response to an increase in voltage ripple, wherein the lower threshold voltage (VOUT lower limit) matching circuit (535) is further configured to increase the lower threshold voltage in response to a decrease in voltage ripple; and a mode control circuit (525) configured to allow the comparator (520) to control the cycling of a power switch when an output voltage for the switching power converter is both lower than the upper threshold voltage (VOUT upper limit) and higher than the lower threshold voltage (VOUT lower limit), and to prevent the comparator (520) from controlling the cycling of the power switch when the output voltage is higher than the upper threshold voltage (VOUT upper limit) or lower than the lower threshold voltage (VOUT lower limit).

A cascaded switched power converter provides a wide voltage conversion ratio and improved efficiency ins systems such as power supplies and amplifiers. A switched-capacitor charge pump circuit is operated by one or more first clock signals and is coupled in cascade with an inductor-based power supply circuit according to one or more second clock signals. A control circuit that generates clock signals so that the one or more second clock signals have a phase offset with respect to the one or more first clock signals that is set to adjust a conversion ratio of the cascaded combination of the switched-capacitor charge pump circuit and the inductor-based power supply circuit. The inductor of the inductor-based power supply circuit may be an inductive load, such as a speaker, and the phase offset may be modulated according to an audio signal to provide audio amplification.

A control circuit for reducing reverse recovery charge in a switching converter includes a first control signal configured to switch a first transistor, a second control signal configured to switch a second transistor, and an auxiliary control signal configured to switch an auxiliary transistor. A first terminal and a second terminal of the first transistor are coupled in parallel to a first terminal and a second terminal of the auxiliary transistor. The first transistor and the second transistor are coupled to a switching node, configured to periodically switch an inductor to convert an input voltage into an output voltage. A delay time exists between the time when the auxiliary control signal is deactivated and the time when the first control signal is deactivated. The auxiliary control signal is deactivated after the second control signal is activated.

The utility model discloses a resonant LLC switching power supply converter and a zero-voltage switch control circuit thereof, and the converter comprises a first switch module, a second switch module, a third switch module, a fourth switch module, a first capacitor module, a second capacitor module, a third capacitor module, an inductor module, and an isolation module. The zero-voltage switch control circuit comprises a reference voltage module, a current detection module, a first control module and a second control module, and the reference voltage module, the current detection module, the first control module and the second control module work cooperatively. The switching loss of the first switching module and the second switching module of the resonant LLC switching power supply converter is dynamically controlled and greatly reduced.

A universal power conversion system for a solar panel array includes a first solar panel generating a first power output; a second solar panel generating a second power output different from the first power output; a common DC bus in communication with the first and second solar panels; a first switching power converter between the first solar panel and the common DC bus, which receives the first power output, and outputs a third power output at a first MPP; a controller which receives, from the common DC bus, the third power output at the first MPP and the second power output in parallel with the third power output. The second power output is maintained at a second MPP to achieve an MPP-maintained fourth power output. The controller further combines the third power output with the MPP-maintained fourth power output, and produces a combined output for a destination sink.

An integrated circuit is provided to drive the gate of a GaN power switching transistor in a switching power converter. During the first part of the on-time period for the GaN power switching transistor, the integrated circuit charges the gate through a relatively high pull-up resistor. During the second part of the on-time period, the integrated circuit charges the gate through a relatively low pull-up resistor. During the first part of the off-time period for the GaN power switching transistor, the integrated circuit discharges the gate through a relatively low pull-down resistor and then discharges the gate through a relatively high pull-down resistor in response to the gate voltage falling below a threshold voltage.

A power conversion circuit includes an inductive switching power converter and a capacitive switching power converter. The inductive switching power converter switches an inductor to converter a DC power to a first power. The capacitive switching power converter switches a conversion capacitor to convert the first power to a charging power for charging a battery. The inductive switching power converter and the capacitive switching power converter flexibly operate in and dynamically switch between a regulation mode, a bypass mode or a combination thereof according to a parameter of the DC power.

A system is provided that includes a diode bridge for rectifying an AC input voltage. A main switching power converter converts a rectified input voltage of the diode bridge to an output voltage. The flyback converter is coupled to the pre-bridge node or the post-bridge node to receive an input voltage that is converted to a supply voltage for the controller integrated circuit. The controller integrated circuit regulates both the output voltage and the supply voltage.

A soft switching power converter includes a main switch, a freewheeling switch, and an inductive coupling unit. The main switch is a controllable switch. The freewheeling switch is coupled to the main switch. The inductive coupling unit is coupled to the main switch and the freewheeling switch. The inductive coupling unit includes a first inductor, a second inductor coupled to the first inductor, and an auxiliary switch unit. The auxiliary switch unit is coupled to the second inductor to form a closed loop. The main switch and the freewheeling switch are alternately turned on and turned off. The auxiliary switch unit is controlled to start to be turned on before the main switch is turned on to provide at least one current path.

Comparator circuitry for power converters. In an example, a circuit includes a comparator having a first comparator input, a second comparator input, and a comparator output, the comparator coupled to a supply terminal. The circuit further includes a first transistor coupled between a boot terminal and the first comparator input and having a control terminal coupled to a switching terminal, and a second transistor coupled between the boot terminal and the second comparator input and having a control terminal coupled to the switching terminal. Also, a third transistor is coupled between the supply terminal and the second comparator input, and a voltage reference generator is coupled to the supply terminal and to a control terminal of the third transistor.

Switching power converters, and methods and primary-side controllers for controlling same. One example is a method of controlling a switching power converter, the method comprising: asserting drive signals applied to a primary switch during a plurality of switching periods; during a first switching period, controlling assertion of a first drive signal based on a sample held by a first capacitor, sampling instantaneous output voltage with a second capacitor, and pre-charging a third capacitor; during a second switching period, controlling assertion of a second drive signal based on a sample held by the second capacitor, sampling instantaneous output voltage with the third capacitor, and pre-charging the first capacitor; and during a third switching period, controlling assertion of a third drive signal based on a sample held by the third capacitor, sampling instantaneous output voltage with the first capacitor, and pre-charging the second capacitor.

A switching power supply comprises a power converter having a transformer, a low side switch configured to draw current from a supply voltage through a primary winding of the transformer and a high side switch configured to couple the primary winding of the transformer to a snubber capacitor. A controller is configured to synchronously control the opening and closing of the low side switch and the high side switch so as to form a regulated output voltage. A first voltage is generated at a node between the low side switch and the high side switch. The controller is further configured to open the high side switch during each switching cycle when the first voltage reaches a determined level. The determined level is higher than the supply voltage by an amount that is adjusted dependent on a monitored level of the supply voltage.

Current sensing in switching power converters. At least one example is a method comprising: discharging an inductor of a buck converter using a low-side FET during a discharge mode of a first cycle; providing, during the discharge mode, a signal indicative of instantaneous current to a voltage regulator, the signal indicative of instantaneous current proportional to current through the inductor during at least a portion of the discharge mode; charging the inductor using a high-side FET during a charge mode, the charge mode in a second cycle subsequent to the discharge mode; and providing, during the charge mode, an emulated signal to the voltage regulator, the emulated signal generated based on the current through the inductor in the discharge mode.

A method implemented by a control circuit adaptively controls operating parameters of a switched-mode power supply to compensate for variation in circuit parameters of the switched-mode power supply, such as variation of: an inductance of an inductor, a capacitance of an output capacitor, and variation of a load capacitance coupled to an output of the switched-mode power supply. The control circuit includes a comparison circuit that determines whether or not an output voltage of the switched-mode power supply has exceeded an overshoot threshold, and a switching control circuit that has an input coupled to an output of the comparison circuit. The switching control circuit adaptively adjusts a control variable that controls one or more operational parameters of the switched-mode power supply in conformity with a relationship between a value of the output voltage and a value of the overshoot threshold in response to the output of the comparison circuit.

A single-stage, multi-output switching power converter is provided, incorporating a switch at each output. A secondary controller operates the switches to distribute a secondary winding current to the multiple outputs, thereby regulating a different output voltage at each output.

An integrated common-mode inductor includes an iron core, a first winding, a second winding, and a third winding. The iron core includes a center magnetic part, a first side magnetic part, and a second side magnetic part. The first winding is wound on the second side magnetic part, and wound on the first side magnetic part. The second winding is wound on the second side magnetic part. The third winding is wound on the second side magnetic part. The first winding wound on the first side magnetic part provides a differential-mode magnetic flux. The first winding, the second winding, and the third winding wound on the second side magnetic part provide a common-mode magnetic flux.

In an example apparatus, a latch (108) includes a first node (128) coupled to a source of a first switch (110) and an output (130) coupled to a gate of the first switch (110). A first diode (218) is coupled to the first node (128) and a second node (224). A second diode (220) is coupled to the second node (224) and ground (132). A second switch (206) is coupled to a voltage source (200) and the second node (224). A third switch (212) includes a gate coupled to the second switch (206), a third source coupled to the second node (224), and a third drain coupled to the latch (108).

A conversion control circuit is configured to generate a PWM (pulse width modulation) signal to control a power switch for switching an inductor to convert an input voltage to an output voltage. The steps of generating the PWM signal includes: enabling the PWM signal at a rising edge of a clock signal to turn on the power switch; disabling the PWM signal to turn off the power switch when an on-time exceeds a predetermined minimum on-time and the output voltage has reached an output level; triggering a next rising edge of the clock signal when the off-time exceeds a predetermined minimum off-time, the output voltage has not reached the output level, and a present cycle period of the clock signal has reached a predetermined cycle period.