Single-inductor dual-path output DC-DC boosting converter based on voltage intermodulation suppression
A boost converter and dual-output technology, which is applied in the direction of output power conversion device, adjustment of electric variable, conversion of DC power input to DC power output, etc., can solve duty cycle changes, output voltage changes, limit converter And other issues
Active Publication Date: 2017-02-01
XIDIAN UNIV
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Problems solved by technology
[0004] Since the single-inductance dual-output converter with ordered power distribution is a dual-input dual-output control in terms of control mode, when one input and one output voltage change, the duty cycle of the two controls will change at the same time, and finally The other output voltage changes at the same time. In practical applications, this will cause crosstalk between the downstream system and the system connected to the converter, which will greatly limit the use of the converter.
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Embodiment 1
[0062] See figure 2 , figure 2 A schematic diagram of a circuit structure of a single-inductance dual-output DC-DC boost converter based on voltage intermodulation suppression provided by an embodiment of the present invention. The converter 10 includes: an input terminal V in , power stage circuit, system control circuit, logic and drive circuit and the first output terminal V out1 , the second output terminal V out2 The system control circuit includes a first control loop and a second control loop, the first control loop includes a first dynamic compensation unit, a ramp generator and a first comparator, and the second control loop Including a second compensation unit, a current detection circuit, a slope compensation circuit and a second comparator; wherein,
[0063] The converter 10 also includes a first feedforward detection circuit, a second feedforward detection circuit and a logic control circuit; the input terminal of the first feedforward detection circuit is e...
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The invention relates to a single-inductor dual-path output DC-DC boosting converter based on voltage intermodulation suppression. The converter comprises an input end (Vin), a power-level circuit, a system control circuit, a logic and driving circuit, and a first output end (Vout1) and a second output end (Vout2), wherein the system control circuit comprises a first control loop and a second control loop; the first control loop comprises a first dynamic compensation unit, a ramp-wave generator and a first comparator; and the second control loop comprises a second compensation unit, a current detection circuit, a ramp-wave compensation circuit and a second comparator, wherein the converter (10) also comprises a first feedforward detection circuit, a second feedforward detection circuit and a logic control circuit. According to the embodiments, change of two paths of output loads is indirectly detected by adopting a feedforward technology; and the logic control circuit controls the first dynamic compensation unit to dynamically adjust the feedback loops of the system, so that a dual-path output intermodulation phenomenon is greatly suppressed.
Description
technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a single-inductance dual-output DC-DC boost converter based on voltage intermodulation suppression. Background technique [0002] Single-inductor multi-output DC-DC converter is one of the hot research directions of DC-DC converter in recent years. Its control methods are mainly divided into two categories: time-division multiplexing and orderly power distribution. Among them, the converter using the orderly power distribution control method has the advantages of high conversion efficiency and strong output load capacity, but at the same time, it has the disadvantage of serious output voltage intermodulation effect. The intermodulation effect refers to the phenomenon that when the load of one of the converters changes suddenly, the output voltage of this channel is disturbed, and the other output branches of the converter are disturbed at the same time. ...
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IPC IPC(8): H02M3/158
CPCH02M3/1584H02M3/1586
Inventor 刘帘曦周逸阳廖栩锋沐俊超朱樟明
Owner XIDIAN UNIV