System controller and method for regulating a power converter. For example, the system controller includes a first controller terminal and a second controller terminal. The system controller is configured to receive an input signal at the first controller terminal and generate a drive signal at the second controller terminal based at least in part on the input signal to turn on or off a transistor in order to affect a current associated with a secondary winding of the power converter. Additionally, the system controller is further configured to determine whether the input signal remains larger than a first threshold for a first time period that is equal to or longer than a first predetermined duration.

A power supply device includes a controller configured to output, to a power converter, a command value to control at least one of a voltage or a current of power output from the power converter, and acquire a measurement value measured by a measurement unit. The controller is configured to, while power conversion operation is being performed by the power converter, change the command value and determine a deterioration of the power converter based on a mode of a change in the measurement value measured by the measurement unit due to a change in the command value.

A method for controlling an amount of power delivered to an electrical load may include controlling an average magnitude of a load current towards a target load current that ranges from a maximum-rated current to a minimum-rated current in a normal mode, and controlling the average magnitude of the load current below the minimum-rated current in a burst mode. The burst mode may include at least one burst-mode period that comprises a first time period associated with an active state and a second time period associated with an inactive state. During the burst mode, the method may include regulating a peak magnitude of the load current towards the minimum-rated current during the active state, and stopping the generation of at least one drive signal during the inactive state to control the average magnitude of the load current to be less than the minimum-rated current.

A circuit for controlling an electromechanical holding brake, includes: at least one halfwave rectifier, which generates a pulsed DC voltage from a mains AC voltage, and a phase gating circuit which is designed to generate a control signal for the electromechanical holding brake from the pulsed DC voltage by means of the phase gating.

A voltage converter includes an input voltage line; an inductor coupled to the input voltage line; transistors coupled to the inductor; an output voltage line coupled to at least one of the transistors; a current sensor coupled to at least one of the input voltage line, the inductor, or the output voltage line; and a comparator coupled between the current sensor and the transistors. A DC-DC converter may include a voltage converter having an inductor and a plurality of transistors and configured to convert an input voltage into a power voltage and output the power voltage to an output terminal, an input current sensor configured to sense the input current of the converter, and a controller configured to change the slew rate of an inductor voltage in response to the input current of the converter and a preset reference current.

A method of protecting a converter of a wind turbine and a respective protection system are provided. The converter is coupled to a generator of the wind turbine to perform conversion of electrical power produced by the generator, the converter including plural semiconductor components that are operational to provide the conversion of the electrical power. The method includes the performing of a step of estimating a junction temperature of at least one of the semiconductor components by determining a current in the converter associated with power loss in one or more of the semiconductor components; estimating power loss associated with the one or more semiconductor components based on the determined current and on a state of the one or more semiconductor components; and using a thermal model to estimate the junction temperature of the semiconductor components based on the estimated power loss. The estimating step is repeatedly performed.

A cascaded multilevel converter is disclosed. The converter comprises a plurality of modules coupled to form a branch, each of the modules comprising a switching circuit and a DC link for supplying DC voltage to the switching circuit. The converter further comprises a controller for controlling the switching circuit of each module to generate an AC voltage in the branch, wherein the controller is configured to: determine for each module a voltage across a capacitor of the DC link of the module, determine for each module a reference power value for charging the capacitor of the DC link of the module to a reference voltage value for the module, determine, from the reference power values of the modules, a common reference AC current value for AC current in the branch, determine, from the common reference AC current value, a common reference AC voltage value for AC voltage in the branch.

The invention relates to a device (200) for measuring a current through a choke (130) of a voltage converter (100) comprising an integrator circuit (140), an amplifier circuit and an NTC resistor (160). The amplifier circuit comprises an inverting and a non-inverting amplifier input connection (152, 154) and an amplifier output connection (156). The non-inverting amplifier input connection (154) is supplied with an amplifier input signal according to an integrator output signal. A voltage signal characterising the current through the choke (130) is applied at the amplifier output connection (156) of the amplifier circuit. The NTC resistor (160) is arranged in the feedback path of the amplifier circuit between the inverting amplifier input connection (152) and the amplifier output connection (156).

The present invention discloses a control method of a dual three-phase permanent magnet synchronous motor by alternately performing sampling and control procedures, which belongs to the field of power generation, power transformation or power distribution technologies. Sampling instants, vector loading instants, and reference value tracking instants of two sets of windings alternate in two halves of a sampling period, and the equivalent sampling frequency of the motor drive system is doubled and the digital delay and the predictive horizon are halved without changing the sampling frequency of a single set of three-phase windings. In addition, by means of a two-layer MPC strategy, a deficient-rank problem is settled that the controlled dimensionality of the system is reduced to two dimensions but the motor control objective is still four dimensions caused by the method with controlling a dual three-phase permanent magnet synchronous motor by alternately performing sampling and control procedures. According to the control method of a dual three-phase permanent magnet synchronous motor by alternately performing sampling and control procedures provided in the present invention, the steady-state and dynamic control performance of a motor drive system for a dual three-phase permanent magnet synchronous motor is effectively improved, and computation burden of the control algorithm is reduced.

An isolated resonant conversion control apparatus includes a voltage and current obtaining unit configured to obtain an output voltage and an output current of an output-side switch transistor of an isolated resonant conversion unit, and a processing unit configured to calculate a switching frequency of an input-side switch transistor of the isolated resonant conversion unit based on the output voltage and the output current, obtain a turn-on offset time and a turn-off offset time of the output-side switch transistor relative to the input-side switch transistor based on the switching frequency of the input-side switch transistor, obtain a duty ratio of a second driving signal based on a duty ratio of a first driving signal, the turn-on offset time, and the turn-off offset time, and generate the second driving signal based on the switching frequency and the duty ratio of the second driving signal.