Switching power supply, and control circuit and method thereof

A technology of control circuit and switching power supply, which is applied in the direction of control/regulation system, electrical components, and regulation of electric variables, etc. It can solve the problems of narrow bandwidth and poor transient response of the control loop of switching power supply, and improve the stability of the loop. performance, good transient response, and small control loop bandwidth

Active Publication Date: 2021-06-22
CHENGDU MONOLITHIC POWER SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, on the other hand, if the control loop bandwidth of the switching power supply is designed to be narrow, it will make the load transient response of the switching power supply worse, which is what we do not want

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  • Switching power supply, and control circuit and method thereof
  • Switching power supply, and control circuit and method thereof
  • Switching power supply, and control circuit and method thereof

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Embodiment Construction

[0020] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0021] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "in on...

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Abstract

The invention discloses a switching power supply, and a control circuit and a control method thereof. The switching power supply converts an input voltage into an output voltage through switching on and switching off of the switch so as to provide the output voltage to a load. The control circuit uses an error amplification circuit to form a control loop to control on and off of the switch, and the error amplification circuit comprises a first input end, a second input end and an output end. The control circuit couples a first compensation resistance network between the first input terminal and the output terminal of the error amplification circuit or couples a second compensation resistance network at the first input terminal of the error amplification circuit. The control circuit also detects whether the switching power supply enters a transient state, and if the switching power supply enters the transient state, the first resistance value of the first compensation resistance network is increased or the second resistance value of the second compensation resistance network is reduced. The control circuit provided by the invention can enable the switching power supply to have better loop stability in a steady state and improve the transient response performance of the switching power supply in a transient state.

Description

technical field [0001] The invention relates to an electronic circuit, in particular to a switching power supply and its control circuit. Background technique [0002] In a switching power supply, depending on the application requirements, sometimes the control loop bandwidth of the switching power supply needs to be designed to be narrow. For example, when performing a bench test on a charging chip, since a battery simulator is usually used instead of a real battery, and a long cable is usually used to connect the battery simulator and the test chip, the use of the cable A large parasitic inductance will be generated at the battery pin of the charging chip. The parasitic inductance is coupled to the output pin of the charging chip through the internal circuit of the charging chip, and works together with the output capacitor connected to the output pin to make the charging chip The loop stability of the control loop deteriorates. Therefore, we need to design the bandwidth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158
CPCH02M3/158H02M1/0025H02M3/1566H02M1/0009H02M3/156
Inventor 徐赏林
Owner CHENGDU MONOLITHIC POWER SYST
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