Quick response loop compensation circuit, loop compensation chip and switching power supply

A loop compensation and fast response technology, applied in electrical components, regulating electrical variables, output power conversion devices, etc., can solve the problems of high designer requirements, output voltage overshoot, large debugging workload, etc. Stress, avoid output voltage overshoot, save manpower

Active Publication Date: 2021-07-02
苏州源特半导体科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a fast-response loop compensation circuit, loop compensation chip and switching power supply, which can solve the problem of high requirements for designers, heavy debugging workload and frequent output voltage overshoot in the prior art. The problem of phenomena

Method used

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  • Quick response loop compensation circuit, loop compensation chip and switching power supply
  • Quick response loop compensation circuit, loop compensation chip and switching power supply
  • Quick response loop compensation circuit, loop compensation chip and switching power supply

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Embodiment 1

[0040] Such as Figure 6 As shown, it is a functional block diagram of the first implementation mode of the fast response loop compensation circuit of the present invention, including: a variable output slew rate differential amplifier, a dynamic current sensing operational amplifier, a zero resistor R1, a pole resistor R2, and a compensation capacitor C C. The signal input positive port 101 of the variable output slew rate differential amplifier is used as the signal input positive port of the fast response loop compensation circuit. The signal input negative port 102 of the variable output slew rate differential amplifier is used as the signal input negative port of the fast response loop compensation circuit, and the voltage difference between port 101 and port 102 is the input voltage of the fast response loop compensation circuit. The voltage input positive port 103 of the variable output slew rate differential amplifier is connected to the positive VCC of the power supp...

Embodiment 2

[0071] Such as Figure 7 As shown, it is a functional block diagram of the second implementation of the fast response loop compensation circuit of the present invention. On the basis of the first embodiment, a low transconductance differential amplifier is added, and the signal input positive port 201 of the low transconductance differential amplifier can be connected to The signal input positive port 101 of the variable output slew rate differential amplifier is connected as the signal input positive port of the fast response loop compensation circuit, and its signal input negative port 202 is in phase with the signal input negative port 102 of the variable output slew rate differential amplifier. Connection, as the signal input negative port of the fast response loop compensation circuit, its output port 205 is connected with the output terminal 111 of the dynamic current sensing operational amplifier, its voltage input positive port 203 is connected with the power supply pos...

Embodiment 3

[0079] This embodiment provides a loop compensation chip, such as Figure 14 As shown, it includes the fast-response loop compensation circuit of Embodiment 1 or Embodiment 2. The loop compensation chip at least includes a high-voltage power input positive pin VDD (port 401), a low-voltage power output pin VCC (port 402), a feedback voltage input pin FB (port 403), and a power input negative pin GND (port 404) , soft start time setting pin SS (port 405), optocoupler drive pin V Opt (port 406).

[0080] The loop compensation chip of the present invention also includes a reference voltage source generating circuit, an optocoupler drive tube PM0, a soft-start resistor R SS , Soft-start cut-off diode D SS . The input end of the reference voltage source generation circuit is connected to the positive input pin VDD of the high-voltage power supply, the first output end of the reference voltage source generation circuit is connected to the signal input positive port of the fast r...

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Abstract

The invention provides a quick response loop compensation circuit, a loop compensation chip and a switching power supply. The quick response loop compensation circuit comprises a variable output slew rate differential amplifier, a dynamic current induction operational amplifier, a resistor R1, a resistor R2 and a capacitor CC. When the input voltage of the variable output slew rate differential amplifier is in a small signal interval, the current fed back by the dynamic current induction operational amplifier is zero or very small, and the output slew rate of the variable output slew rate differential amplifier is not changed. When the variable output slew rate differential amplifier is out of the small signal interval, the dynamic current induction operational amplifier outputs dynamic response current to the variable output slew rate differential amplifier, so that the slew rate of the variable output slew rate differential amplifier is increased, and the output impedance of the variable output slew rate differential amplifier is reduced. Under the condition that the loop stability and the dynamic performance are not sacrificed, loop normalization of switching power supplies of different specifications is achieved, and manpower and material resources needed by loop debugging are saved. When the switching power supply is started, the stress is reduced, and the output voltage overshoot phenomenon is avoided.

Description

technical field [0001] The invention relates to the technical field of fast-response loop compensation circuits, in particular to a fast-response loop compensation circuit, a loop compensation chip and a switching power supply. Background technique [0002] Power supply and power regulation are the most basic functions of electronic systems. Without a stable power supply, it is impossible for any application with a load to work normally, whether it is a mobile phone, various chargers or signal samplers. Because the current required by the power-consuming load is different at different times and under different working conditions, the rapidly changing load causes a transient shift in the original noise-free power supply, and the final result will cause the original DC component to appear. unnecessary voltage fluctuations. Therefore, it is often necessary to control the stability of the voltage through a negative feedback loop to ensure that the output voltage does not chang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02M1/34H02M1/092H02M3/158
CPCH02M1/36H02M1/34H02M1/092H02M3/1582
Inventor 唐盛斌
Owner 苏州源特半导体科技有限公司
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