Power Supply Controller with Min-Sum Multicycle Modulation
A power supply controller, multi-cycle modulation technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve problems such as difficulty in meeting cost and performance requirements, reducing effective switching frequency, etc.
Inactive Publication Date: 2015-08-19
POWER INTEGRATIONS INC
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Problems solved by technology
[0014] Existing controllers for power supplies that reduce the effective switching frequency by allowing or preventing switching in groups of switching periods struggle to meet the cost and performance requirements in galvanically isolated applications
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[0041] Methods and apparatus for controlling a power supply with minimum sum multi-cycle modulation are disclosed. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that the specific details need not be employed to practice the invention. In other instances, well-known materials or methods have not been described in detail in order to avoid obscuring the present invention.
[0042] Reference throughout this specification to "one embodiment," "an embodiment," "an example," or "an example" means that a particular feature, structure, or characteristic described with respect to the embodiment or example is referred to by Included in at least one embodiment of the invention. Thus, appearances of the phrases "in one embodiment," "in an embodiment," "an example," or "an example" in various places throughout this specification ar...
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A power supply controller is disclosed. An example power supply controller includes a signal separator circuit coupled to generate a feedback signal in response to a sense signal representative of an output of a power supply. An error signal generator is coupled to generate an error signal in response to the feedback signal and a reference signal. A control circuit is coupled to generate a drive signal in response to the error signal. The drive signal is coupled to control switching of a switch of the power supply. A multi-cycle modulation circuit is included in the control circuit and is coupled to generate a skip signal in response to a start skip signal, a stop skip signal and a skip mask signal. The skip mask signal is generated in response to the skip signal. The start skip and stop skip signals are coupled to cause the drive signal to start skipping or stop skipping, respectively, on-time intervals of cycles. The skip mask signal is coupled to disable the start skip signal from causing the drive signal to start skipping the on-time intervals of cycles.
Description
technical field [0001] The present invention relates to power supplies. In particular, the present invention relates to controllers for switching power supplies. Background technique [0002] In typical applications, the AC-DC power supply receives a relatively low frequency 100 to 240 volts rms input at nominally 50 Hz or 60 Hz from a common AC outlet. The AC input voltage is typically rectified within the power supply to become an unregulated DC voltage source for a DC-DC switching power converter. The switches within a power converter are typically turned on and off at a relatively high frequency (tens or hundreds of thousands of hertz) by a control circuit to provide a regulated output that may be suitable for operating electronic equipment, Or suitable for charging batteries that provide power to electronic devices. [0003] The design of a switching power supply is usually a compromise between the conflicting requirements of efficiency, size, weight and cost. The b...
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IPC IPC(8): H02M3/335
CPCH02M2001/0035Y02B70/16H02M3/33523H02M1/0035Y02B70/10
Inventor 毛鸣明
Owner POWER INTEGRATIONS INC