AC-DC (alternating-current to direct-current) converter control circuit
A technology for controlling circuits and converters, applied to electrical components, output power conversion devices, etc., can solve the problems of slow rise in PWM duty cycle, slow system startup, startup failure, etc., to save chip area and ensure startup Speed, the effect of improving the overall efficiency
Active Publication Date: 2013-09-18
ZHEJIANG UNIV +1
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Problems solved by technology
Since the PWM duty cycle of the system is usually controlled by the voltage of the off-chip compensation capacitor, the rising speed of the PWM duty cycle is slow, which will cause the system to start slowly, or even fail to start within a limited time
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[0031] In order to describe the present invention more specifically, the technical solutions and related working principles of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0032] Such as image 3 As shown, a control circuit of an AC-DC converter includes: an off-chip compensation capacitor C, a power-on start control unit, a charging lifting unit, a conduction time detection unit, a charging control unit, and a PWM generating unit; wherein: off-chip One end of the compensation capacitor C is connected to the charging lifting unit, the charging control unit and the PWM generating unit, and the other end is grounded;
[0033] In this embodiment, the AC-DC converter such as figure 1 As shown, it is composed of EMI, rectifier bridge, transformer T, grounding capacitor Cp, main power switch tube Q, secondary power diode D and filter capacitor Cr; the transformer has three windings: primary winding...
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The invention discloses an AC-DC (alternating-current to direct-current) converter control circuit which comprises an off-chip compensation capacitor, a power-on starting control unit, a charging lifting unit, a conduction time detection unit, a charging control unit and a PWM (pulse-width modulation) generation unit. By detecting voltage of an input line of a converter and using the power-on starting control unit, the power-on process of the converter is accurately controlled; the process of the converter from successful powering-on to normal working is controlled by the charging lifting unit and the charging control unit; by quickly lifting voltage, the charging process is guaranteed and the starting slope is increased; by the PWM generation circuit, the converter can be guaranteed to complete the process from successful powering-on to normal working in an extremely short time. In the whole process of powering-on of the converter, by the AC-DC converter control circuit, successful starting and starting speed are guaranteed. Compared with other design, the AC-DC converter control circuit has the advantages that sizes of off-chip devices can be greatly reduced, overall efficiency of a system can be improved, and substantial chip area can be saved.
Description
technical field [0001] The invention belongs to the technical field of voltage converter control, and in particular relates to a control circuit of an AC-DC converter. Background technique [0002] Power electronic converters have many advantages such as high energy density, high efficiency, and high controllability, and have been used more and more in the fields of traditional energy and new energy. In household appliances and consumer electronics equipment, AC-DC (alternating current-direct current) converter is one of the most widely used converters. With the continuous improvement of users' demand for small-sized electrical appliances, the integration level of AC-DC converters is also continuously improved. Therefore, designers need to minimize the number of off-chip devices to reduce the size of the converter and reduce the overall cost. [0003] In a typical AC-DC converter, such as figure 1 As shown, it includes EMI (electromagnetic interference filter capacitor), ...
Claims
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IPC IPC(8): H02M1/36
Inventor 何乐年姜俊敏赵一尘卢晓冬
Owner ZHEJIANG UNIV