Non-isolation DC/DC control circuit and converter
A technology of DC converters and control circuits, used in control/regulation systems, output power conversion devices, instruments, etc.
Inactive Publication Date: 2012-09-12
RUIJIE NETWORKS CO LTD
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[0014] The present invention provides a non-isolated DC / DC control circuit and a timing control method for providing logic control signals and a non-isolated DC / DC converter to solve The problem that the switching loss in the existing traditional non-isolated DC / DC control circuit and converter increases sharply with the increase of the switching frequency
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[0038] The specific implementation manners of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0039] According to the previous description, in the non-isolated DC / DC control circuit, when two switching devices in series are alternately turned on and off by the driving signal for DC / DC conversion, during the turn-on process of the switching devices (such as MOSFET devices Q1 and Q2) , there is always a switching loss, because when the current through the switching device increases, the voltage of the switching device usually does not drop to 0V at this time. According to the power = voltage * current relationship, the power generated by the current and voltage at this time is the power consumption. It is useless work, so this power needs to be minimized, and the ideal result is zero.
[0040] like Figure 5 As shown, the present invention discloses a non-isolated DC / DC control circuit, which is...
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The invention discloses a non-isolation DC / DC control circuit and a converter to solve a problem that the conventional non-isolation DC / DC control circuit adopts a random disordered mode to set dead zone time, so the switch loss in the non-isolation DC / DC converter is sharply increased with the switching frequency increase. The circuit comprises a voltage detecting unit, an internal control logicunit and a drive unit, wherein the voltage detecting unit is used for detecting voltage differential signals at both ends of each switch device; the internal control logic unit is used for providing a logic control signal which indicates each switch device to switch on and switch off, and after the internal control logic unit provides the logic control signal which indicates one switch device to switch off, the time of starting to provide the logic control signal which indicates the other switch device to switch on is determined according to the voltage differential signals at both ends of the other switch device; and the drive unit is used for providing a drive signal which drives both switch devices to alternatively switch on and switch off according to the logic control signal.
Description
technical field [0001] The invention relates to the field of electronic device control, in particular to a non-isolated DC (Direct Current) / DC (Direct Current) control circuit and a timing control method for providing logic control signals, and a non-isolated DC (Direct Current) / DC (Direct Current) control circuit. Current) converter. Background technique [0002] Metal oxide semiconductor field-effect transistor (Metal Oxide Semiconductor Field-Efiect Transistor, MOSFET) referred to as metal oxide half field-effect transistor, is a field-effect transistor (field-effect transistor) that can be widely used in analog circuits and digital circuits. MOSFETs can be divided into N-type and P-type MOSFETs according to the polarity of their "channels", commonly known as NMOS and PMOS. [0003] A non-isolated DC (Direct Current) / DC (Direct Current) converter is a circuit that converts a certain DC voltage DC into another DC voltage DC. NMOS is widely used in non-isolated DC / DC conv...
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IPC IPC(8): H02M3/155
Inventor 陈林峰
Owner RUIJIE NETWORKS CO LTD