dc‑dc conversion circuit
A conversion circuit, DC-DC technology, applied in the direction of output power conversion device, electrical components, adjusting electrical variables, etc., can solve the problems of low speed, low precision, and affecting voltage output accuracy, etc., to achieve fast speed and accuracy high degree of effect
Active Publication Date: 2017-05-03
SHANGHAI HUALI MICROELECTRONICS CORP
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Problems solved by technology
[0012] The existing sample-and-hold circuit has the disadvantages of low speed and low precision, which can easily cause inaccurate current detection, and even lead to failure of the control loop, affecting the accuracy of voltage output
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[0044] In the following description, numerous specific details are given in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without one or more of these details. In other examples, some technical features known in the art are not described in order to avoid confusion with the present invention.
[0045] It should be understood that the invention can be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. Like reference numerals refer to like elements throughout.
[0046] It will be understood that when an element or layer is referred t...
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The invention discloses a DC-DC switching circuit which comprises a first power switch tube (MP1), a second power switch tube (MN1), a sampling resistor (R0), a third power switch tube (MP0) and a current sampling module, wherein the first power switch tube (MP1) and the second power switch tube (MN1) are connected between supply voltage VDD and the ground terminal GND in series, the sampling resistor (R0) and the third power switch tube (MP0) are connected with the two ends of the first power switch tube (MP1) in parallel and connected in series, and the current sampling module comprises a voltage-current converting unit, a current difference value unit and a current-voltage converting unit. The voltage-current converting unit is used for converting voltage of the two ends of the sampling resistor (R0) into current magnitudes. The current difference value unit is utilized for solving a difference value of the two current magnitudes. The current-voltage converting unit converts the difference value into a voltage signal to output Vsense to a PMW comparator. The on-off state of the first power switch tube and the on-off state of the second power switch tube are controlled by a detection signal received by the PMW comparator. The DC-DC switching circuit can well sample the currents passing through the power tubes and converts the currents into voltage to be output.
Description
technical field [0001] The present invention relates to the field of integrated circuit manufacturing, and to be precise, relates to a DC-DC conversion circuit. Background technique [0002] Switching power supply is a DC stabilized power supply controlled by switching mode. It is widely used in computers, network communication equipment and consumer electronics due to its small size, light weight, high efficiency, wide range of voltage regulation, safety and reliability, etc. in almost all electronic equipment. With the development of semiconductor technology and electronic technology, the functions of electronic products are constantly enriched, the volume and weight are constantly reduced, but the power consumption is constantly increasing, which constantly poses challenges to the design of switching power supplies. [0003] According to the principle of DC-DC converters, DC converter chips are mainly divided into two categories: linear regulators and switching power con...
Claims
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IPC IPC(8): H02M3/156
CPCH02M3/1563
Inventor 蔡俊张宁王志利
Owner SHANGHAI HUALI MICROELECTRONICS CORP