摘要:
An electronically commutated fan system (100) includes a conversion module (10), an inverter unit (20), and a control unit (30). The conversion module (10) receives an input power source (Vin) and converts the input power source (Vin) into a first DC power source (Vdcl). The inverter unit (20) receives the first DC power source (Vdcl) and converts the first DC power source (Vdcl) into an output power source (Vout) to make a fan (40) rotate. The control unit (30) controls a rotational speed of the fan (40) to be within a first error range (Rel) when the control unit (30) determines that an amplitude of the input power source (Vin) is varied. The control unit (30) determines that the input power source (Vin) is a DC power source or an AC power source. The conversion module (10) is controlled by the control unit (30) to convert the DC power source or the AC power source into the first DC power source (Vdcl).
摘要:
The invention provides a network (400) for receiving a single DC input voltage (212). The network (400) comprises a plurality of loads (100A, 100B, 100C) and a plurality of power control apparatus (200A, 200B, 200C). Each power control apparatus (200A, 200B, 200C) comprises a first input for receiving the single DC input voltage (212), a DC-DC converter for converting the single DC input voltage (212) into a DC output voltage (216A, 216B, 216C), an output for providing the DC output voltage (216A, 216B, 216C) to a corresponding one of the plurality of loads and a second input for receiving input information to control a first power to the corresponding one of the plurality of loads (100A, 100B, 100C). The network (400) further comprises a network controller (425) for providing the input information to each of the power control apparatus (200A, 200B, 200C).
摘要:
A PFC circuit (10) according to the invention is connected to a grid (1), includes an input filter (2) and a rectifier (3) connected to a converter (4). A control circuit (5) generates the reference current for the current regulator of the converter (4) that controls its input current. Thereby, the reference current is generated by adding an offset current (I 0 ) to a standard reference current and adapting the magnitude of the standard reference current to compensate for a change of the input power resulting from the addition of the offset current (I 0 ). However, due to the addition of the offset current (I 0 ) the magnitudes of some lower harmonic components of the input current of the power supply unit are increased and the magnitudes of some higher harmonic components of the input current are decreased such that the power supply may draw more current from the grid.
摘要:
A power supply, a power control method and a display apparatus having the same, for controlling a standby mode, are provided. The power supply of an electronic apparatus includes: a rectifier configured to rectify a current of alternating current (AC) power input as input power, into a direct current (DC); a power factor correction (PFC) circuit configured to correct a power factor of a DC voltage converted by the rectifier; a switching circuit configured to convert the DC voltage output by the PFC circuit into a predetermined operating voltage and a standby voltage and supply the operating voltage and the standby voltage to the electronic apparatus; and an output controller configured to control the PFC circuit and the switching circuit in order to convert the DC voltage into the predetermined operating voltage and standby voltage by the switching circuit and to supply the operating voltage and the standby voltage to the electronic apparatus.
摘要:
The invention provides a network (400) for receiving a single DC input voltage (212). The network (400) comprises a plurality of loads (100A, 100B, 100C) and a plurality of power control apparatus (200A, 200B, 200C). Each power control apparatus (200A, 200B, 200C) comprises a first input for receiving the single DC input voltage (212), a DC-DC converter for converting the single DC input voltage (212) into a DC output voltage (216A, 216B, 216C), an output for providing the DC output voltage (216A, 216B, 216C) to a corresponding one of the plurality of loads and a second input for receiving input information to control a first power to the corresponding one of the plurality of loads (100A, 100B, 100C). The network (400) further comprises a network controller (425) for providing the input information to each of the power control apparatus (200A, 200B, 200C).
摘要:
A control method for an electric sanding machine, which method comprises rectification of the mains voltage and switched motor control. An external inductance L1 and an extra switch according to step-up topology have been incorporated to carry out power correction also during the time when the voltage is lower than the nominal voltage of the motor. This is preferable because the current and the voltage are lower than in a case where the power correction should be carried out during the whole cycle. Above all, the value at the external inductance L1 may be lower because the voltage is lower when the switching is carried out.
摘要:
A power supply, a power control method and a display apparatus having the same, for controlling a standby mode, are provided. The power supply of an electronic apparatus includes: a rectifier configured to rectify a current of alternating current (AC) power input as input power, into a direct current (DC); a power factor correction (PFC) circuit configured to correct a power factor of a DC voltage converted by the rectifier; a switching circuit configured to convert the DC voltage output by the PFC circuit into a predetermined operating voltage and a standby voltage and supply the operating voltage and the standby voltage to the electronic apparatus; and an output controller configured to control the PFC circuit and the switching circuit in order to convert the DC voltage into the predetermined operating voltage and standby voltage by the switching circuit and to supply the operating voltage and the standby voltage to the electronic apparatus.
摘要:
The invention relates to a device (100) for charging an electric energy store (B) from a three-phase AC voltage source (W1, W2, W3), having, in each phase of the AC voltage source (W1, W2, W3): - a step-down converter (TS1...TS3) with a switch (STS1...STS3); - a diode (FLD) connected in parallel to the step-down converter (TS1...TS3); and - a converter (U) which is connected to the step-down converter (TS1...TS3) and which comprises at least one first half bridge (H1) with two serially connected switches (S1, S2), an inductor (L4) being connected between a connection point of the two switches (S1, S2) of the first half bridge (H1) and the step-down converter (TS1...TS3); - wherein a current direction across the inductor (L4) is set by means of a rectifier (D11...D33) in the step-down converter (TS1...TS3); and - the switches (STS1...STS3) of the step-down converter (TS1...TS3) and at least one second switch (S2) of the first half bridge (H1) of the converter (U) can be switched by means of a controller (10) dependent on the voltages of the AC voltage source (W1, W2, W3) and a current flowing through the inductor (L4) such that a current drawn from the AC voltage source (W1, W2, W3) in order to charge the electric energy store (B) can be generated in such a manner that a substantially sinusoidal current is drawn from each phase of the AC voltage source (W1, W2, W3), the current and the corresponding voltage of the AC voltage source (W1, W2, W3) being substantially in phase in each said phase.