4results about How to "Stable output current" patented technology

The present application belongs to the technical field of power supply and distribution. A parallel three-level inverter modulation method, system, product, medium and equipment are proposed, which equivalent double parallel three-level inverters as a whole five-level inverter, inject zero sequence components to the initial three-phase reference signal to obtain the reference signal, identify the resultant vector through rounding and remainder operation, and then adjust the reference signal according to the sum of the three-phase state of the initial resultant vector to output a five-segment switching sequence, and then decompose the equivalent five-level reference signal into two sets of three-level reference signals, allocate the reference signals by dividing the half-carrier period and compare them with the triangular carrier to obtain a three-level vector sequence combination. The present application realizes the comprehensive optimization of common-mode voltage, zero-sequence circulating current and output current ripple, avoids complex sector judgment and duty cycle calculation, and reduces the implementation complexity and computational burden.

A control circuit for a power converter includes a sensing circuit, a ramp signal generator, an error amplifier, a comparator, and a pulse width modulation (PWM) circuit. The sensing circuit is coupled to a first output circuit to provide a current sensing signal. The ramp signal generator is coupled to the sensing circuit and receives the current sensing signal to provide a ramp signal. The error amplifier receives a reference voltage and the output feedback voltage of the power converter to provide an error amplification signal. The comparator is coupled to the ramp signal generator and the error amplifier and receives both the ramp signal and the error amplification signal to provide a control signal. The PWM circuit is coupled between the comparator and the first output circuit, receives the control signal, and provides a PWM signal to control the first output circuit. The ramp signal generator adjusts the slope of the ramp signal based on the current sensing signal. This invention avoids ringing of the power converter's output voltage after unloading / unloading, thereby improving the stability of the system output.

The invention relates to a driving method of a three-phase conversion half-bridge. The method comprises the following steps: driving the three-phase conversion half bridge by a first commutation strategy; obtaining a first detection voltage, a second detection voltage and a third detection voltage of three bridge arms in the three-phase conversion half bridge; the first detection voltage is greater than the second detection voltage, and the second detection voltage is greater than the third detection voltage; and when the first detection voltage, the second detection voltage and the third detection voltage meet a preset condition, driving the three-phase conversion half-bridge by using a first driving strategy in a corresponding switching period so as to enable three bridge arms of the three-phase conversion half-bridge to perform normal commutation. When the first detection voltage, the second detection voltage and the third detection voltage meet the preset conditions, the three-phase conversion half-bridge is driven by the first driving strategy, so that short circuit of capacitors of two bridge arms is avoided, and the three-phase conversion half-bridge is further enabled to stably output current.

The application discloses a heating wire heating power control circuit, method and electronic cigarette. The circuit is connected with the heating wire and comprises a power supply module, a current detection wire or a current detection resistor, a first heating wire wire, a second heating wire wire and a control module. The power supply module is connected with a battery voltage and a control end of the control module and one end of the current detection wire or the current detection resistor. One end of the current detection wire or the current detection resistor is also connected with a first detection end of the control module, and the other end is respectively connected with a second detection end of the control module and one end of the first heating wire wire. The other end of the first heating wire is connected with one end of the heating wire. One end of the second heating wire wire is connected with the other end of the heating wire, and the other end is grounded. The control module is used for controlling the power supply module to supply power to the heating wire and is also used for collecting the voltage between the current detection wire or the current detection resistor to control the heating power of the heating wire. The application can realize constant power control of the heating wire.