Switching power supply system and control circuit and control method thereof
A switching power supply circuit and control circuit technology, applied in the electronic field, can solve problems such as power supply voltage drop, control circuit power supply shortage, power supply voltage being affected by output, etc., and achieve the effect of increasing system reliability
Pending Publication Date: 2022-07-29
SHENZHEN KIWI MICROELECTRONICS CO LTD
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Problems solved by technology
[0004] However, in many occasions, such as in an isolated switching power supply circuit, the power supply of the primary side control circuit is often provided through auxiliary windings, etc., and its power supply voltage is affected by the output. When the system is in standby control state or load transient For other reasons, since the PWM signal of the switching tube stops outputting, it may cause a drop in the power supply voltage, resulting in insufficient power supply of the control circuit, which in turn affects the reliability of the home appliance.
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[0025] In order to further understand the present invention, the preferred embodiments of the present invention are described below in conjunction with the examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.
[0026] The description in this section is only for a few typical embodiments, and the present invention is not limited to the scope of the description of the embodiments. Combinations of different embodiments, replacement of some technical features in different embodiments, and replacement of same or similar prior art means with some technical features in the embodiments are also within the scope of description and protection of the present invention.
[0027] "Coupling" or "connection" in the specification includes both direct connection and indirect connection. Indirect connection is a connection through an intermed...
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The invention provides a control circuit for controlling a switching tube in a switching power supply circuit, a switching power supply system and a control method thereof. The control circuit comprises a comparison circuit which compares a power supply voltage and a threshold signal, and the power supply voltage changes along with the change of the output voltage of the switching power supply circuit; the pulse signal generation circuit is used for providing an effective pulse signal when the power supply voltage is smaller than a threshold signal; and the driving circuit receives the pulse signal and is used for controlling the switch tube to be switched on. According to the control circuit, the switching power supply system thereof and the control method, the problem of insufficient power supply of the control circuit caused by output voltage drop under various conditions can be solved, the power supply voltage is adaptively adjusted according to actual conditions, and the system reliability is improved.
Description
technical field [0001] The invention relates to the field of electronics, in particular but not limited to a switching power supply system, a control circuit and a control method thereof. Background technique [0002] Switching power supply circuits are widely used because of their high power efficiency and are used to provide a suitable power supply for the load. [0003] In applications such as small household appliances, due to their extensive use in households, higher requirements are placed on green energy conservation, so their standby power consumption is an important parameter. In order to obtain higher power efficiency, when the load is low, the system will reduce the switching frequency, or perform hiccup control intermittent switching to further reduce losses. [0004] However, in many occasions, such as in an isolated switching power supply circuit, the power supply when the primary side control circuit is working is often provided through auxiliary windings, et...
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Login to View More IPC IPC(8): H02M3/335H02M1/32H02M1/08
CPCH02M3/33569H02M1/32H02M1/081
Inventor 张波
Owner SHENZHEN KIWI MICROELECTRONICS CO LTD