dc-dc converter
A DC-DC and converter technology, applied in the field of energy harvesting circuits, can solve the problems of large standby power consumption and large current consumption of fixed delay modules, and achieve the effects of reduced standby current, strong realizability, and simple design
Active Publication Date: 2016-02-10
WUXI SOLA MICROELECTRONICS
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Problems solved by technology
The main defect in the above technology is that although the frequency of the switching output is reduced and the power consumption is reduced, the triangular wave generator and the PWM comparator are always in operation, and the fixed delay module also needs to consume a large current , and, other in figure 1 The auxiliary modules not marked in are also in the working state, so there is still a large standby power consumption during standby
Method used
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Embodiment
[0030] A DC-DC converter according to one aspect of the present embodiment includes an error amplifier, a pulse width modulation comparator, and a switch for converting an input voltage to into a predetermined output voltage, characterized by:
[0031] The DC-DC converter also includes a triangular wave generator, which is used to generate a triangular waveform signal; a minimum pulse width generator with the same frequency, which generates a pulse width with the same frequency as the triangular wave; a pulse width modulation comparator, which is used to control the switch output pulse width ; The above-mentioned pulse width modulation comparator and the output phase-OR of the same-frequency minimum pulse width generator are used to realize the minimum fixed pulse width.
[0032] Such as figure 2 Shown is a schematic circuit diagram of the DC-DC converter 1 in this embodiment.
[0033] The DC-DC converter also includes a turn-off control comparator, which is used to control...
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The invention discloses a DC-DC converter and a control circuit thereof. The DC-DC converter is used for converting input voltage into preset output voltage by carrying out at least one of multiple types of pulse width modulation control. A DC-DC converter control device further comprises a triangular wave generator, a same-frequency minimum pulse width generator, a pulse width modulation comparator and a turn-off control comparator. The triangular wave generator is used for generating triangular wave signals. The same-frequency minimum pulse width generator is used for generating a pulse width with the same frequency as triangular waves. The pulse width modulation comparator is used for controlling switched output pulse widths. An output phase of the pulse width modulation comparator and an output phase of the same-frequency minimum pulse width generator are used for achieving the minimum fixed pulse width. The turn-off control comparator is used for controlling the triangular wave generator and the same-frequency minimum pulse width generator to be turned on or turned off. According to the DC-DC converter and the control circuit thereof, the problem that stand-by power consumption is high because a large number of circuit modules can not be turned off or can not be turned off completely is thoroughly solved; due to the adoption of the turn-off control comparator, standby current is greatly reduced, and besides, the DC-DC converter and the control circuit thereof are low in process stability requirement, strong in realizability, and suitable for being produced on a large scale.
Description
technical field [0001] The invention relates to the field of energy collection circuits, in particular to a DC-DC converter and a control circuit of the DC-DC converter. Background technique [0002] Portable electronic devices such as mobile phones or notebook-sized personal computers use batteries as their power source. However, the output of the battery undergoes changes such as a drop in output due to discharge, so portable electronic equipment includes a DC-DC converter for converting the output voltage of the battery into a voltage to be used in the equipment. There are three known methods for converting voltage: step-down method, step-up method and step-up / step-down method. In the boost method, a battery is used that has an output voltage lower than that to be used in the device, and the output voltage is boosted to the voltage to be used in the device by a step-up DC-DC converter. With this boost method, extremely high conversion efficiencies can be achieved. [0...
Claims
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IPC IPC(8): H02M3/00
CPCY02B70/10
Inventor 吴翔宇
Owner WUXI SOLA MICROELECTRONICS