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Circuit for increasing transient response speed of voltage mode control loop

A transient response, control loop technology, applied in control/regulating systems, adjusting electrical variables, instruments, etc., can solve the problem that the output voltage Veao of the error amplifier has a slow response time, and the output voltage Vout takes a long time to return to the normal value. Problems such as transient response deterioration, to achieve the effect of improving the transient response speed, improving the response speed, and being less likely to be falsely triggered

Active Publication Date: 2020-12-22
SG MICRO
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

figure 2 It shows that when the load jumps, that is, when the load resistance RL suddenly increases or decreases suddenly, the output voltage Vout will suddenly increase or decrease, and the response time of the output voltage Veao of the error amplifier is slow, so that the output voltage Vout returns to the normal value. The longer the time, the worse the transient response

Method used

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  • Circuit for increasing transient response speed of voltage mode control loop
  • Circuit for increasing transient response speed of voltage mode control loop
  • Circuit for increasing transient response speed of voltage mode control loop

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Embodiment Construction

[0027] Below with the accompanying drawings ( Figure 3-Figure 6 ) to illustrate the present invention.

[0028] image 3 It is a circuit structure schematic diagram for implementing the present invention to improve the transient response speed of the voltage mode control loop. Figure 4 yes image 3 A schematic diagram of the relationship between the output signal extra, the input signal Vref2 and the input signal Vfbo related to the middle loop response speed booster circuit ea-tran-helper with time (abscissa time). Figure 5 yes image 3 Schematic diagram of the structure of the middle loop response speed booster circuit ea-tran-helper. Figure 6 yes image 3 Schematic diagram of the change with time of the medium output voltage Vout, the feedback output voltage Vfbo, the error output voltage Veao, and the inductor current IL. refer to Figure 3 to Figure 6 As shown, a circuit that improves the transient response speed of the voltage mode control loop includes a sys...

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Abstract

A circuit for increasing the transient response speed of a voltage mode control loop can push a second zero point of a compensation network to a high-frequency position by reducing the resistance value of a loop access resistor so as to increase the transient response speed of a system loop, and comprises the system loop transient response compensation network which comprises a loop access resistor R1. The circuit is characterized in that the loop access resistor R1 is of a series structure of a loop access first resistor R11 and a loop access second resistor R12, the loop access first resistor R11 is connected to a short-circuit switch in parallel, and the control end of the short-circuit switch is connected with a switch control circuit.

Description

technical field [0001] The invention relates to the transient response technology of the voltage mode control loop in the power management chip, in particular to a circuit for improving the transient response speed of the voltage mode control loop, by splitting the loop access resistance in the compensation network into one large and one The series structure of two small resistors, and the large resistor is connected in parallel to the short-circuit switch controlled by the loop response speed booster circuit, which can push the second zero point of the compensation network to High frequency, thereby improving the transient response speed of the system loop. Background technique [0002] In power management chips, voltage mode feedback is a common loop control mode. However, since the inductor and capacitor in the voltage mode loop form a second-order LC filter network, a double pole will be formed, which will cause insufficient phase margin and affect the loop stability. T...

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Application Information

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IPC IPC(8): G05F1/575
CPCG05F1/575
Inventor 易新敏谢云宁高峡郭廷
Owner SG MICRO