摘要:
A switched-mode power supply includes at least one capacitor (9) and a transformer having a plurality of windings (12, 17). Advantageously a capacitor (9) is integrated in the transformer by way of at least one multi-layer foil winding (12). This foil winding (12) of the transformer consists of a plurality of planar conductive electrodes (1, 2, 3, 4, 5, 6) which, alternately with an insulating dielectric foil, are stacked onto each other to form an electrode stack.
摘要:
The invention relates to a DC—DC converter and a power supply unit formed thereby, with which a DC input voltage (Vdc) may be converted into two DC output voltages (U1, Usb) via a resonant switched-mode power supply. Via a circuit stage (M1, M2), a control circuit (C) generates a first AC voltage (VAC), which is converted via two resonant circuits with different transmission behavior and two rectifiers (G1, Gsb) in frequency-dependent manner into DC output voltages (U1, Usb). To achieve a standby mode, in which the first DC output voltage (U1) is designed to be very low and hardly any power is drawn on the output side, a second, thinner auxiliary circuit stage (M3, M4) is provided, which is coupled to the resonant circuits via an inductor (L2). The current consumption of the circuit in standby mode may be reduced considerably by appropriate dimensioning.
摘要:
A circuit arrangement including an EHT cascade circuit (1) with at least a series arrangement (2, 3) of capacitors having staggered conductive strips (19, 20, 21, 22, 23, 24, 25) provided on both sides of a dielectric layer (18, 18a, 18b) which, together with the conductive strips (19, 20, 21, 22, 23, 24, 25), is wound about a support to constitute a winding form (15, 15a, 15b). A compact and low-cost construction, particularly for use of the circuit arrangement in an EHT generator for a picture display tube, is achieved in that the EHT cascade circuit (1) precedes an EHT output capacitor (6, 12), and in that the EHT output capacitor (6, 12) is the support.
摘要:
A resonant converter includes an inverter for generating an AC voltage which is fed to a resonant arrangement with a capacitor and a transformer. The circuit provides two types of secondary units, each having a secondary winding of the transformer and at least one rectifier element. Secondary units of the first and second type are then distinguished by opposite orientation. At least two output voltages are delivered on the output, a first output voltage of which being supplied as a direct output of a first-type secondary unit and a second output voltage as a “stack output” of a first-type secondary unit and a second-type secondary unit. The two output voltages can be regulated separately and independently of each other with a regulating device by suitably choosing frequency and duty cycle of a pulse width modulated voltage generated by the inverter driven by the regulating device.
摘要:
A high-voltage generator includes a high-voltage unit (1) and a further voltage generating unit (2) for generating DC high voltages (UF1, UF2), the voltage generating unit (2) including an adjustment unit (3) for adjusting a DC high-voltage (UF1, UF2) in an adjusting range between a lower and an upper limit voltage. In order to enable an as low as possible electric strength of the adjustment unit (3) and to reduce the impedance of the voltage generating unit (2), a DC voltage of between 100% and 200% of the upper limit voltage is applied to one connection point of the adjustment unit (3) whereas a DC voltage of between 50% and 100% of the lower limit voltage is applied to the other connection point of the adjustment unit (3).
摘要:
The invention relates to an electric arrangement for operating a an electric discharge lamp (13) which is connected in series with a coil (14) and a switch (15) to a pulsatory direct voltage source. The combination of the lamp and the coil is shunted by a rectifier. The lamp is shunted by a capacitor (18) and the switch is periodically rendered conductive at an instant when the instantaneous voltage of the pulsatory direct voltage source is between 0.5 and 0.8 times the then required re-ignition voltage of the lamp. The voltage build up across the capacitor (18) after the switch has become conducting causes the lamp to reignite. The luminous efficacy of the lamp is comparatively high.
摘要:
A circuit arrangement for supplying a lamp with a DC lamp current and comprising only passive components and equipped with mains input terminals for connection to the poles of an AC supply voltage source. A rectifying apparatus has two input terminals coupled to the mains input terminals and two output terminals for generating a DC voltage from the low frequency AC supply voltage. A ballast capacitor is coupled between the mains input terminals and the output terminals of the rectifying apparatus. A load circuit is coupled to the output terminals of the rectifying apparatus and has terminals for connection to the lamp. The load circuit includes a series arrangement of only passive components which connect the output terminals of the rectifying apparatus and comprise an inductor and the terminals for connection to the lamp. The circuit arrangement is simple and inexpensive and is very suitable for operating a discharge lamp and for incorporation into a compact lamp.
摘要:
A transformer, particularly for a voltage converter, has a primary winding having a predeterminable leakage inductance and at least one secondary winding magnetically coupled to the primary winding with a predetermined voltage-transformation ratio. The (primary) leakage inductance is increased as compared with a conventional transformer without violating the limits for implementing an appropriately functioning transformer, and without choosing an additional coil or a larger core than is required for the power transformation, in that the primary winding comprises at least two winding sections whose magnetic couplings to the at least one secondary winding are implemented such that they operate in mutually opposite senses and are arranged such that they are at least substantially magnetically decoupled from one another.
摘要:
In a voltage converter for converting an AC input voltage into a DC high voltage and further DC power supply voltages, in which the AC voltage applied to the converter is applied to a rectifier arrangement (1, 2, 3, 4) whose output signal is coupled to two consecutively switched electronic switches (6, 7), and in which this DC voltage is converted into the DC high voltage and into the DC power supply voltages, the circuit arrangement has a simple structure in that a series arrangement of a capacitance (8), an inductance (9) and a primary winding (10) of a transformer (11) is arranged in parallel with one of the electronic switches (6, 7), in that a secondary winding (12) of the transformer (11) precedes a capacitance (15) at the output end, in that a control circuit (20) is provided which controls the switching frequency of the electronic switches (6, 7) in such a way that a DC voltage of the desired value decreases across the capacitance (15) at the output end, and in that the transformer (11) is provided with additional taps (16, 17) at the secondary end, from which the DC power supply voltages can be derived.
摘要:
A simple circuit arrangement for supplying a load (10) with energy from a power supply means (1 to 5) ensures both a uniform energy supply of the load and a reliable suppression of interference, both from the load into the power supply mains and in the reverse direction. The circuit accomplishes the foregoing by utilizing at least two energy storage devices (7, 9), at least one of which can be alternately connected either to the load or to the power supply mains (1 to 5).