Post-voltage regulation type voltage regulation control circuit of power supplier
A technology of power supply and voltage stabilization control, which is applied in the direction of control/regulation systems, instruments, and regulation of electrical variables, etc., and can solve problems affecting output voltage stability, unstable sawtooth wave voltage signals, etc.
Inactive Publication Date: 2008-04-02
NIKO SEMICON
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Problems solved by technology
As shown in Figure 1, the conventional post-stabilization voltage regulation control circuit diagram is prone to generate unstable sawtooth wave voltage signals in the discontinuous mode (DCM) by the ramp generator (Ramp Generator), which may affect the stability of the output voltage
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[0012] In order to make your examiner fully understand the purpose, characteristics and effects of the present invention, the following specific embodiments are hereby provided, together with the accompanying drawings, to describe the present invention in detail, as follows:
[0013] 3 and 5 are respectively a control circuit diagram and an action waveform diagram of the control circuit in a preferred embodiment of the present invention. Please refer to FIG. 3 and FIG. 5 , the post-stabilization voltage regulation control circuit of the power supply of the present invention includes: a trigger circuit 1 connected to an input terminal of a secondary side energy storage inductor of a power supply. A sawtooth wave generator 2 is connected to the trigger circuit 1 . A first comparator 3 , one positive input end of which is connected to the sawtooth wave generator 2 . A feedback regulator U1, which connects a negative input terminal of the first comparator 3 and a second output te...
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The present invention provides a post voltage stabilizing type voltage stabilizing control circuit of power supplies and is primarily applied to multi-grouped output switching power supplies. The voltage stabilizing control circuit adopts a control method of leading edge synchronization and conduction time modulation to examine the leading edge of an input voltage waveform of a secondary side energy storage inductance to generate a synchronization pulse signal; the synchronization pulse signal is reset to a sawtooth wave generator to generate a stable continuous sawtooth wave signal and is compared with a voltage feedback signal to generate a power conduction signal corresponding to a stable output signal. When the power conduction signal is cut off, a flywheel conduction signal with an opposite phase is generated; each of the two different signals has an output terminal to drive two power switches through the power conduction and the flywheel conduction respectively. The present invention can be applied to different types of voltage reduction regulators which can be either AC or DC , and the stabilizing control circuit can be used for the stabilizing control of an input and output insulated multi-grouped output switching power supply.
Description
【Technical field】 [0001] The present invention relates to a post-stabilization voltage stabilization control circuit of a power supply, especially a circuit that utilizes a leading edge trigger to reset a continuous sawtooth wave voltage signal. 【Background technique】 [0002] Figure 1 and Figure 2 are the conventional post regulation control circuit (post regulation control circuit) diagram and its operation waveform diagram respectively, which adopt the method of detecting the trailing edge to detect the voltage of the secondary side winding of the transformer T1 The trailing edge of the waveform (Sync.Signal) generates a trailing edge trigger as a reset signal to reset the ramp generator. Each time the reset signal discharges the voltage of the ramp voltage signal (Ramp voltage) to zero and recharges it to the highest potential to generate a stable continuous ramp voltage signal. In addition, the input signal obtained by the voltage division of impedance Z1 and resistor ...
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IPC IPC(8): G05F1/12
Inventor 徐达经杨惠强
Owner NIKO SEMICON