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A fast response loop compensation circuit, loop compensation chip and switching power supply

A loop compensation, fast response technology, applied in electrical components, regulating electrical variables, output power conversion devices, etc., can solve the problems of high designer requirements, large debugging workload, output voltage overshoot, etc., to reduce stress, avoid output voltage overshoot, small area effect

Active Publication Date: 2022-07-15
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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  • A fast response loop compensation circuit, loop compensation chip and switching power supply
  • A fast response loop compensation circuit, loop compensation chip and switching power supply
  • A fast response loop compensation circuit, loop compensation chip and switching power supply

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Embodiment 1

[0040] like Image 6 Shown is the principle block diagram of the first implementation 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-point resistor R1, a pole-point 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 the ports 101 and 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 supply,...

Embodiment 2

[0071] like Figure 7 shown is a schematic 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 is connected to the The signal input positive port 101 of the variable output slew rate differential amplifier is connected to 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. connected, as the signal input negative port of the fast response loop compensation circuit, its output port 205 is connected with the output end 111 of the dynamic current sense operational amplifier, its voltage input positive port 203 is connected with the power supply positive VCC, its volt...

Embodiment 3

[0079] This embodiment provides a loop compensation chip, such as Figure 14 As shown, the fast response loop compensation circuit of the first embodiment or the second embodiment is included. The loop compensation chip includes at least 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 driving tube PM0, and 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 high-voltage power input positive pin VDD, the first output end of the reference voltage source generation circuit is connected to the signal input positive port of t...

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Abstract

The invention provides a fast response loop compensation circuit, a loop compensation chip and a switching power supply. The fast response loop compensation circuit includes a variable output slew rate differential amplifier, a dynamic current sensing operational amplifier, a resistor R1, a resistor R2 and a capacitor C C . When the input voltage of the variable output slew rate differential amplifier is in the small signal range, the current fed back by the dynamic current sensing 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 outside the small signal range, the dynamic current sensing operational amplifier outputs a dynamic response current to the variable output slew rate differential amplifier, increasing its slew rate and reducing the output impedance. The present invention realizes the normalization of the loops of switching power supplies of different specifications without sacrificing the loop stability and dynamic performance, and saves manpower and material resources required for loop debugging. Reduce stress and avoid output voltage overshoot during switching power supply startup.

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 noiseless 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 vary g...

Claims

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Application Information

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Patent Type & Authority Patents(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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