AC-DC (alternating current-direct current) regulator with high-precision constant current output function

A constant current output and regulator technology, applied in the direction of irreversible AC power input conversion to DC power output, etc., can solve the problems of large deviation and low precision of current constant current characteristics

Active Publication Date: 2013-02-20
WUXI ZGMICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During this period of time, the actual peak value of the inductor current of the main winding is greater than the target value, and the desaturation time of the power tube varies with the difference of the device, and the size of the parasitic capa

Method used

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  • AC-DC (alternating current-direct current) regulator with high-precision constant current output function
  • AC-DC (alternating current-direct current) regulator with high-precision constant current output function
  • AC-DC (alternating current-direct current) regulator with high-precision constant current output function

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Embodiment Construction

[0030] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0031] image 3 An AC-DC circuit with constant current output according to an embodiment of the present invention is illustrated. Such as image 3 As shown, the AC-DC circuit has a transformer T1 between the input VAC and the output Vout, and the transformer T1 plays the role of electrical isolation.

[0032] The rectified AC voltage VAC is applied to one end of the main winding of the transformer T1, and the other end of the main winding is grounded after passing through the power transistor Q0 and the resistor Rsn. An over-current comparator detects whether the voltage across the resistor Rsn is greater than the reference voltage Vref, and generates an OCP signal based on the detected situation. The OCP signal is input to the S input end of the RS flip-flop to generate a set CTRL signal. The flip-flop can also re...

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Abstract

The invention relates to an AC-DC (alternating direct-direct current) regulator with a high-precision constant current output function. The regulator comprises a transformer and a power tube which is connected at a main winding side of the transformer, wherein the voltage corresponding to main winding current is higher than reference voltage; and a grid of the power tube is controlled to be turned off. The regulator is characterized by comprising a delay locking ring and a reference voltage adjusting circuit, wherein the delay locking ring is used for comparing a first lasting time spent on that the main winding current rises up to a peak value and a second lasting time spent on that the main winding current expectedly rises up to a goal current value; and the reference voltage adjusting circuit is used for adjusting the reference voltage by utilizing the comparing result. According to an AC-DC circuit with high precision, disclosed by the embodiment of the invention, the output current can not be different along with different saturation deterioration times of devices and can not be different along with different stray capacitance values and the like generated by the devices and PCBs (printed circuit boards), so that constant current values of products can be output with the high precision.

Description

technical field [0001] The invention relates to an AC-DC regulator with high precision constant current output. Background technique [0002] In flyback AC-DC applications, it is sometimes necessary to implement a constant voltage constant current (CV / CC) characteristic for the secondary output. figure 1 A circuit for realizing constant current is shown, figure 2 signaled figure 1 The output waveform of the circuit. In practice, when the current limit signal (OCP) turns off the power transistor Q0, due to the existence of the desaturation time of the power transistor and the charging and discharging time of the parasitic capacitance (total Td), the inductor current of the main winding continues to rise, The secondary rectifier has current output until flyback. During this period of time, the actual peak value of the inductor current of the main winding is greater than the target value, and the desaturation time of the power tube varies with the difference of the device,...

Claims

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Application Information

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IPC IPC(8): H02M7/12
Inventor 王才宝王钊
Owner WUXI ZGMICRO ELECTRONICS CO LTD
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