Bidirectional DC power supply circuit
A power circuit, bidirectional DC technology, applied in the direction of converting DC power input to DC power output, electrical components, adjusting electrical variables, etc., can solve problems such as increasing the cost of DC power conversion circuits, unable to achieve bidirectional conversion of DC power, and reducing cost effect
Active Publication Date: 2009-07-01
BYD SEMICON CO LTD
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Problems solved by technology
If only one module and its peripheral components are used, the bidirectional conversion of DC power cannot be realized, which increases the cost of the DC power conversion circuit
Method used
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Embodiment Construction
[0022] refer to figure 1 A bidirectional DC power supply circuit, the circuit includes a detection resistor 11, which is used to detect the input current signal, and the resistance value of the detection resistor 11 is set at 30-100mΩ; a signal processing module 12, which is used to feed back the voltage of the detection resistor, the feedback detection current and the direction Control processing, output pulse width control signal; Pulse width modulation module 13, output pulse width signal according to the pulse width control signal input by signal processing module; Switch drive module 14, select switch according to the pulse width signal output by pulse width modulation module 13 on or off.
[0023] The detection resistor 11 feeds back the power supply current signal to the signal processing module 12, and the signal processing module 12 processes it to generate a pulse width control signal. The pulse width modulation module 13 outputs a pulse width signal to the switch dr...
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Abstract
The invention provides a bidirectional DC power supply circuit comprising a detection resistor for detecting an input current signal; a signal processing module for feeding back the voltage of the detection resistor, feeding back the detection current and the direction for control and treatment, and outputting a pulse width control signal; a pulse width modulation module for outputting a pulse width signal according to the control signal input by the signal processing module; and a switch drive module for selecting the turning-on or the turning-off of the switch according to the pulse width signal output by the pulse width modulation module. The signal processing module controls the pulse width of the pulse width modulation module to be higher according to the lower current signal detected by the detection resistor, and the switch drive module controls the turning-on or the turning-off of two MOS tubes according to the lower pulse width, thereby realizing the power conversion in two directions of boosting and bucking. The bidirectional DC power supply circuit can effectively reduce the cost of the DC power supply.
Description
technical field [0001] The invention relates to the field of power conversion, in particular to a step-up and step-down DC power conversion circuit. Background technique [0002] More and more existing portable products use rechargeable power sources, which require power release and charging management, such as AC-DC (AC-DC) adapter charging, USB charging, and mutual charging between batteries. Currently, DC-DC The (DC-DC) power supply circuit converts the voltage in two different directions of boost and step-down, and realizes step-up and step-down, which requires the use of a power release conversion module and a charge management module, as well as independent peripheral components. If only one module and its peripheral components are used, the DC power bidirectional conversion cannot be realized, which increases the cost of the DC power conversion circuit. Contents of the invention [0003] The purpose of the present invention is to provide a bidirectional DC power su...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H02M3/10H02M3/155
CPCH02M3/1582
Inventor 赵一飞屈擘
Owner BYD SEMICON CO LTD