34 results about "Zeta converter" patented technology

The invention relates to an input adaptive auto-excitation type Zeta converter. The input adaptive auto-excitation type Zeta converter comprises a main loop and an input adaptive control circuit which is used for adaptive current limit protection; the main loop comprises an input capacitor Ci, a PNP type BJT tube Q3, a capacitor C2, a diode D4, an inductor L1, an inductor L2, an output capacitor Co, a flywheel sub-circuit used for lowering the follow current conduction consumption and a drive circuit used for driving the PNP type BJT tube Q3; the drive circuit comprises an NPN type BJT tube Q2, a resistor R2, a resistor R4, a resistor R5 and a diode D1, and the input adaptive control circuit comprises an NPN type BJT tube Q1, a diode D2, a resistor R1, a resistor R3 and a resistor R6. According to the input adaptive auto-excitation type Zeta converter, the input adaptive control circuit controls the current of the inductor L1 or the collecting electrode current of the PNP type BJT tube Q3 and has a current limit function with the input adaptive characteristic, and moreover, the input adaptive control circuit also realizes smaller current detection consumption; the flywheel sub-circuit enables the follow current conduction consumption of the Zeta converter to be lowered.

The invention relates to an input adaptive auto-excitation type Zeta converter. The input adaptive auto-excitation type Zeta converter comprises a main loop and an input adaptive control circuit which is used for adaptive current limit protection; the main loop comprises an input capacitor Ci, a PNP type BJT tube Q3, a capacitor C2, a diode D4, an inductor L1, an inductor L2, an output capacitor Co, a flywheel sub-circuit used for lowering the follow current conduction consumption and a drive circuit used for driving the PNP type BJT tube Q3; the drive circuit comprises an NPN type BJT tube Q2, a resistor R2, a resistor R4, a resistor R5 and a diode D1, and the input adaptive control circuit comprises an NPN type BJT tube Q1, a diode D2, a resistor R1, a resistor R3 and a resistor R6. According to the input adaptive auto-excitation type Zeta converter, the input adaptive control circuit controls the current of the inductor L1 or the collecting electrode current of the PNP type BJT tube Q3 and has a current limit function with the input adaptive characteristic, and moreover, the input adaptive control circuit also realizes smaller current detection consumption; the flywheel sub-circuit enables the follow current conduction consumption of the Zeta converter to be lowered.

The invention discloses a power factor correction rectifier at the receiving end of a wireless power transmission system. The front stage of the invention utilizes the principle of resonance between the inductance and the capacitance to realize the power factor correction technology of the medium and high frequency current continuous conduction mode. By reducing the switching frequency, the switching loss is reduced, and the influence of high-frequency parasitic parameters is reduced. A variety of DC-DC converters, such as Buck converters, Buck-Boost converters, and Zeta converters, can be connected to the post-stage to flexibly control the output voltage.

The invention discloses a switching converter double pulse frequency modulation V<2> type control method and a device thereof. According to the relationship between a control voltage Vc generated by the fact that a reference voltage Vref and an output voltage Vos pass through an error compensator and the output voltage Vos, preset constant-on-time or constant-off-time is combined, three sections of time t1, t2 and t3 are generated, each period sequentially adopts a control timing sequence formed by the t1, the t2 and the t3, and switch-on and switch-off of a switching tube of a switching converter are controlled. The method and the device can be used for controlling a Buck converter, a Buck2 converter, a Cuk converter, a Zeta converter, a single-tube forward converter, a double-tube forward converter, a push-pull converter, a push-pull forward converter, a half-bridge converter, a full-bridge converter and other switching converters in various topological structures. The device has the advantages that load transient response speed is high, voltage stabilizing precision is high, and stabilizing performance is good.

An automatic voltage-balancing bipolar Zeta DC‑DC converter comprising a DC input source, a basic Zeta converter, m‑1 same polarity expansion unit, n A reverse polarity voltage extension unit. The expansion unit with the same polarity and opposite polarity is composed of an inductor, two capacitors and a diode. By adjusting the number of the expansion unit, the input and output gain of the converter and the voltage stress of the switching device can be adjusted. The proposed converter has the advantages of simple control and drive circuit, wide adjustment range of input and output voltages, and low voltage stress of switching devices.

A bipolar transistor self-exciting Zeta converter comprises a PNP transistor Q1, an inductor L1, a capacitor C2, a diode D1, an inductor L2 and a capacitor C3 which form a main circuit of the Zeta converter and also comprises a PNP transistor Q2, wherein the emitting electrode of the PNP transistor Q1 is connected with the positive terminal of direct current input voltage Vi; the junction of the inductor L1 and the capacitor C2 is connected with the collecting electrode of the PNP transistor Q1; the emitting electrode and the collecting electrode of the PNP transistor Q2 are respectively connected with the emitting electrode and the base electrode of the PNP transistor Q1; the base electrode of the PNP transistor Q1 is also connected to the negative terminal of direct current input voltage Vi by a resistor R1; series branch circuits of a resistor R2 and a resistor R3 are connected at the two ends of the emitting electrode and the collecting electrode of the Q1 in parallel; and the junction of the resistor R2 and the resistor R3 is connected with the base electrode of the PNP transistor Q2. The converter has simple circuit structure, a few of components and widened application range.

The invention discloses a switch converter double-edge constant breakover time modulation voltage type control method and a device thereof. According to relation between output voltages and voltage reference value, the switch converter double-edge constant breakover time modulation voltage type control method and the device thereof use a control time series formed by constant breakover, turn-off and constant breakover or a control time series formed by turn-off, constant breakover and turn-off for controlling breakover and turn-off of the switch converter switch tube. The switch converter double-edge constant breakover time modulation voltage type control method and the device thereof can be used for controlling a plurality of switch converters with a topological structure, such as a Buck converter, a Buck2 converter, a Cuk converter, a Zeta converter, a single tube normal shock converter, a double-tube normal shock converter, a push-pull converter, a push-pull normal shock converter, a half-bridge converter and a full-bridge converter. The switch converter double-edge constant breakover time modulation voltage type control method and the device thereof has the advantages of being simple in control, fast in transient response speed, high in voltage stabilization accuracy, and capable of not compensating network.

The invention provides a wide-gain zeta converter. The wide-gain zeta converter mainly comprises a switch tube, three power inductors, two middle energy-storage capacitors, an output capacitor and three diodes. In the working process of the wide-gain zeta converter, the inherent properties of an inductor-capacitor-diode network are utilized, when the switch tube is switched off, the second power inductor charges the first middle energy-storage capacitor, and the first power inductor discharges; when the switch tube is switched on, the first middle energy-storage capacitor and an input power supply charge the first power inductor simultaneously, therefore, output voltage is boosted, and the gain of output voltage of the converter is expanded by combining original characteristics of a traditional zeta converter.

An MOSFET (Metal-Oxide -Semiconductor Field Effect Transistor)-based auto-excitation type Zeta converter comprises a Zeta converter main loop consisting of an input capacitor Ci, an N-type MOSFET M1, an inductor L1, a capacitor C, a diode D, an inductor L2 and a capacitor Co. The converter further comprises an auxiliary power supply U1, and adopts a single-MOSFET basic auto-excitation unit circuit consisting of the N-type MOSFET M1, a diode D1, a diode D2, a resistor R1, a resistor R2, a resistor R3, a capacitor C1, a hysteresis comparator U3 and a drive circuit U2. The MOSFET-based auto-excitation type Zeta converter provided by the invention has the advantages of higher efficiency and wider applicable power range.

An electronic half-bridge ZETA converter comprising: a transformer (T), wherein a half-bridge (S1, S2) is connected to the primary winding (T1) of the transformer (T), and capacitors (CA1, CA2) and diodes (DA1, DA2) is associated with the half-bridge switches (S1, S2). The ZETA converter is connected to the secondary winding (T2) of the transformer (T), the converter comprises a first inductance comprising the leakage inductance (LM) and the second inductance (L0) of the transformer (T). The converter includes a control unit (112) that drives the half-bridge switches. During a fourth time interval of the switching cycle, the first switch (S1) and the second switch (S2) are opened, so that the capacitor (CA2) associated with the second switch (S2) charges and is connected to The capacitor (CA1) associated with the first switch (S1) is discharged, thereby achieving zero voltage switching.