Adjustable Input Error Amplifier for Single-Stage Power Factor Correction Controllers
A power factor correction and input error technology, applied in differential amplifiers, DC-coupled DC amplifiers, improved amplifiers to improve efficiency, etc., can solve the problems of power loss, low work efficiency, high cost, etc., to improve work efficiency and save costs , The effect of reducing the loss of electric energy
Active Publication Date: 2017-07-28
XIDIAN UNIV
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Problems solved by technology
Since this traditional error amplifier cannot adjust the input voltage according to the different working modes of the circuit, the circuit still performs error amplification and comparison when the circuit is not working normally, so it will cause power loss, low work efficiency and high cost.
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[0043] The circuit structure of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0044] refer to figure 2 , the adjustable input error amplifier of the present invention includes: a first buffer voltage module 1 , a second buffer voltage module 2 , a transmission control module 3 and an operational amplifier module 4 .
[0045] The first buffer voltage module 1 is provided with an input terminal A and two output terminals B and C; wherein the input terminal A is connected to an externally provided reference voltage V1; the output terminal B outputs a reference voltage divider V4; the output terminal C outputs Reference voltage divider V5;
[0046] The second buffer voltage module 2 is provided with an input terminal A and two output terminals B and C; wherein the input terminal A is connected to the feedback voltage V2 provided externally; the output terminal B outputs the feedback voltage divider V6; the output termina...
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The invention discloses an adjustable input error amplifier for a single-stage power factor correction controller, which mainly solves the problems of power loss, low work efficiency and high cost caused by the inability of the existing error amplifier to adjust the input voltage. The error amplifier includes a first buffer voltage module (1), a second buffer voltage module (2), a transmission control module (3) and an operational amplifier module (4); the first buffer voltage module (1) and the second buffer voltage module (2) Divide the externally provided reference voltage and feedback voltage to output different reference voltages and different feedback voltage divisions; through the transmission control module (3) under the control of the externally provided enable signal, according to different operating modes Switch between different reference voltage divisions and different feedback voltage divisions, select one of them to input to the operational amplifier module (4) for amplification, and output an error amplification signal. The invention realizes the function of adjustable input, effectively reduces the power loss and improves the working efficiency of the circuit.
Description
technical field [0001] The invention belongs to the technical field of electronic circuits, and relates to an analog integrated circuit, in particular to an adjustable input error amplifier for a single-stage power factor correction controller. Background technique [0002] With the wide application of rectifier bridges in electronic equipment, the input mains current contains a large number of harmonic components, which reduce the power supply efficiency of the grid and enhance electromagnetic interference. Therefore, power factor correction must be adopted in electronic equipment technology. In the power factor correction circuit design, the error amplifier circuit is a very important module and the core of a successful system design. figure 1 shows the block diagram of a conventional error amplifier. [0003] Such as figure 1 As shown, the circuit mainly includes the operational amplifier module. The reference voltage V1 and the feedback voltage V2 pass through the op...
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IPC IPC(8): H03F3/45H03F1/02
Inventor 叶强邵丽丽张铎澜来新泉
Owner XIDIAN UNIV