Switching mode power supply control
A mode and switching technology, applied in control/regulating systems, electrical components, regulating electrical variables, etc., can solve problems of high complexity
Inactive Publication Date: 2012-07-04
INFINEON TECH AUSTRIA AG
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Problems solved by technology
However, the implementation complexity of such a PWM / PFM controlled switching converter is undesirably high and requires additional hardware for determining the conditions defining the switching from PWM mode to PFM mode (and vice versa)
Also, some implementations may tend to toggle undesirably between the two control modes
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[0018] The making and using of the presently preferred embodiments are discussed in detail below. It should be appreciated, however, that the present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are merely illustrative of specific ways to make and use the invention, and do not limit the scope of the invention.
[0019] figure 1 a shows the topology of a general buck converter as an example of a switching converter. However, it should be noted that the invention is not limited to switched mode power supplies (SMPS) comprising a buck converter. The inventive concept can be easily applied to applications such as boost converters, buck-boost converters, converter, flyback converter, etc. any type of switching converter. Typically, switching converters include at least one switching element, which is in figure 1 The current example is a MOS transistor T SW and freewheelin...
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The invention relates to a switching mode power supply control. A method for controlling a switching converter is disclosed whereby the switching converter is configured to convert an input voltage into an output voltage supplied to a load in accordance with a switching signal, The switching converter is configured to operate in a pulse width modulation mode or, alternatively, in a pulse frequency modulation mode. When operating in the pulse width modulation mode, generating, as the switching signal, a pulse width modulated (PWM) signal of a pre-defined constant switching frequency. The PWM signal has a duty cycle that is regulated such that the output voltage of the switching converter matches, at least approximately, a desired output voltage under the condition that the duty cycle being regulated such that it does not fall below a predefined minimum duty cycle. The output voltage is monitored and switched over to the pulse frequency modulation mode when the output voltage exceeds a predefined first threshold. The method further comprises, when operating in the pulse frequency modulation mode, monitoring the output voltage and generating, as the switching signal, a series of pulses of a predefined constant pulse length. A pulse is generated each time the output voltage falls to a predefined second threshold and monitoring the frequency of the switching signal and switching to the pulse width modulation mode when the frequency of the switching signal exceeds a predefined frequency threshold.
Description
technical field [0001] The present disclosure relates to switching control of a switched mode power supply (SMPS) to ensure its efficient operation, in particular, the SMPS includes a control mode using pulse width modulation or pulse frequency modulation to generate switching signals. Background technique [0002] In recent years, stringent requirements regarding power supply efficiency have drawn attention to the use of switch-mode power supplies (SMPS, also known as "switching converters"). However, the actual efficiency of the SMPS depends on the controller determining the switching times of the semiconductor switch(s) included in the SMPS. Probably the most common method for controlling the switches of an SMPS is pulse width modulation (PWM), which can be implemented fairly simply. However, using PWM to control an SMPS and thus regulate its output voltage or output current does not guarantee high efficiency over a wide range of output currents. [0003] A PWM based co...
Claims
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IPC IPC(8): H02M3/155
CPCY02B70/16H02M2001/0032H02M3/156Y02B70/10H02M1/0032
Inventor M.弗莱巴尼C.加博萨E.奥里蒂A.韦基亚托
Owner INFINEON TECH AUSTRIA AG