An automatically adjustable dc-dc step-down circuit and control method
A DC-DC and step-down circuit technology, applied in the direction of adjusting electrical variables, control/regulation systems, electrical components, etc., can solve the problems of inability to switch, output voltage cannot be automatically adjusted, and conversion efficiency cannot be effectively improved. Effect of reducing controller loss and improving conversion efficiency
Active Publication Date: 2021-09-17
ZHUHAI GREE REFRIGERATION TECH CENT OF ENERGY SAVING & ENVIRONMENTAL PROTECTION
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Problems solved by technology
However, the output voltage of this circuit cannot be automatically adjusted according to load changes, and cannot be switched between continuous operation mode (CCM) and discontinuous operation mode (DCM), so the conversion efficiency cannot be effectively improved.
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[0043] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.
[0044] It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate ...
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The invention belongs to the field of step-down circuits, and in particular relates to an automatically adjustable DC-DC step-down circuit and a control method, including a DC-DC main circuit, the DC-DC main circuit including an inductor module, a capacitor module and a load module, The capacitance module and the load module are connected in series with the inductance module after being connected in parallel; the inductance value of the inductance module is adjustable; a control circuit, the control circuit is coupled with the DC-DC main circuit; the control circuit is based on The change of the voltage value of the load module switches the working mode of the DC-DC main circuit, and adjusts the inductance value of the inductance module connected to the circuit according to different working modes. The DC-DC step-down circuit of the present invention can automatically adjust the working mode according to the load condition, improve the conversion efficiency of the circuit and reduce the loss of the controller.
Description
technical field [0001] The invention belongs to the field of step-down circuits, in particular to an automatically adjustable DC-DC step-down circuit and a control method. Background technique [0002] The DC-DC step-down circuit is a relatively common DC conversion DC circuit. The equivalent circuit is as follows: figure 1 As shown, it consists of a switch tube (K1), an inductor (L), a diode (D1) and an electrolytic capacitor (C1). When the switch is turned on, the input voltage stores energy in the inductor through the switch, and charges the capacitor and supplies power to the load; when the switch is turned off, the inductor discharges the load through the capacitor and the freewheeling diode. Therefore, the voltage output can be controlled by adjusting the conduction time of the switch tube. The output voltage is not only related to the duty cycle of the switching tube but also to the working mode. Generally, there are two working modes of the DC-DC step-down circuit,...
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IPC IPC(8): H02M3/158H02M1/08
CPCH02M1/08H02M3/158H02M1/0048Y02B70/10
Inventor 唐森程海珍
Owner ZHUHAI GREE REFRIGERATION TECH CENT OF ENERGY SAVING & ENVIRONMENTAL PROTECTION