Integrated circuit for an oscillator adapted to drive a control device of a switching resonant converter

A resonant converter and integrated circuit technology, applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., to achieve the effect of improving transient response and reducing dynamic sequence

Active Publication Date: 2015-05-27
STMICROELECTRONICS SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second class of problems concerns the fact that, according to simulation-based studies, the transfer function of the power stage exhibits a strongly variable dc gain, the number of poles varies from one to three depending on the operating point and has a very variable Location
The system is not well suited to be integrated; also, current sensing systems with transformers are used for high power conversion systems and not for low power systems due to cost

Method used

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  • Integrated circuit for an oscillator adapted to drive a control device of a switching resonant converter
  • Integrated circuit for an oscillator adapted to drive a control device of a switching resonant converter
  • Integrated circuit for an oscillator adapted to drive a control device of a switching resonant converter

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Embodiment Construction

[0037] image 3 A schematic circuit diagram of a resonant converter with a control device 100 comprising an oscillator 101 according to the invention is shown. The converter comprises a resonant load preferably comprising a transformer 20 with a primary winding L1 and two secondary windings L2; ​​the primary winding L1 is connected via a capacitor Cr to the middle point HB of the half-bridge, which is a transistor The common point between Q1 and Q2, and the primary winding L1 is also directly connected to the sense resistor Rs, which is connected to the ground GND. The two windings L2 of the secondary are connected between ground GND and two respective diodes D1 and D2 having cathodes connected together and connected to a resistor Rout and a capacitor Cout in parallel, the parallel resistor Rout and capacitor Cout to ground GND. Transistors Q1 and Q2 are preferably MOS transistors, especially NMOS transistors; the drain terminal of transistor Q2 is connected together with th...

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Abstract

There is described an integrated circuit (103) for an oscillator (101) adapted to drive a control device (100) of a switching resonant converter; the converter comprises a switching circuit (Q1-Q2) adapted to drive a resonant load (Cr, 20) provided with at least one transformer (20) with at least a primary winding (L1) and at least a secondary winding (L2). The control device is adapted to drive the switching circuit and the converter is adapted to convert an input signal (Vin) into an output signal (Vout). The integrated circuit comprises first means (Q20, Q3-Q7, 113-115) adapted to charge and discharge a capacitor (Ct) by a first current signal (Ic + i p (t)) such that the voltage (Vct) at the terminals of said capacitor is between first (Vv) and second (Vp) reference voltages, with said second reference voltage higher than said first reference voltage. The current signal (Ic + i p (t)) comprises a second current signal (Ic) representative of the feedback loop that controls the output signal (Vout) of the converter; the integrated circuit comprises second means (110) adapted to rectify a signal (Vs) representative of the current (Ir) circulating in the primary winding (L1) and the first current signal (Ic + i p (t)) comprises a third current signal (i p (t)) proportional to the rectified signal. ( Figure 3 )

Description

technical field [0001] The invention relates to an integrated circuit for an oscillator suitable for driving a control device of a switched resonant converter. Background technique [0002] Forced switching converters (switching converters) are known in the prior art, which have devices for controlling them. Resonant converters are a large class of forced switching converters characterized by the presence of a resonant circuit that plays an active role in determining the input-output power flow. In these converters, a bridge (half bridge) consisting of 4 (2) power switches (typically power MOSFETs) powered by a DC voltage generates a voltage square wave which is applied to a A resonant circuit at the frequency of the fundamental frequency of the wave. Thus, due to its chosen characteristics, the resonant circuit responds primarily to the fundamental frequency component while ignoring the higher harmonics of the square wave. The result is that the delivered power can be mo...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H02M3/335H02M3/338
CPCH02M3/3376Y02B70/10
InventorC·阿德拉格纳
OwnerSTMICROELECTRONICS SRL