Control method of switching power supply with low ripple being capable of absorbing current
A technology of switching power supply and control method, which is applied to electrical components, output power conversion devices, etc., can solve the problem that switching power supply does not have current absorption and other problems, and achieve the effect of low output voltage ripple
Active Publication Date: 2011-05-18
WUXI CHIPOWN MICROELECTRONICS
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Problems solved by technology
The large output voltage ripple also limits the use of this system architecture in systems with critical ripple requirements
Moreover, the switching power supply of this architecture does not have the ability to sink current from the output
Method used
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[0026] figure 1 It is the functional block diagram of the forced continuous working mode, Vin is the input power supply, GND is the reference ground of the input power supply, Out is the output terminal of the switching power supply, Oscillator is the clock generator module, clk is the output signal of the clock signal, Control is the control module, Switch is a single-pole double-throw switch, point c is the common terminal of the single-pole double-throw switch, a and b are two switching points of the single-pole double-throw switch, L1 is the output inductor, C1 is the output capacitor, Feedback is the feedback module, and fb is the feedback The output signal Rload of the module is the load.
[0027] Such as figure 1 Among them, one end of the inductor L1 is connected to the output terminal Out, and the other end is connected to the active end c of the switch Switch. When the active end c of the switch Switch is connected to the power supply end a, the inductor L1 is conne...
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A control method of a switching power supply with a low ripple being capable of absorbing the current has two control states, namely a large output current control state in which the inductive current in each clock cycle always flows unidirectionally, and a small output current control state in which the inductive current in each clock cycle flows bidirectionally; when each clock cycle is started, the movable end of an inductor is connected onto the input voltage through a clock signal control switch module, later a control module determines when to connect the movable end of the inductor onto ground according to a feedback signal, and then the movable end of the inductor is connected onto the input voltage until the next clock cycle is started. The control method is characterized in thatthe inductive current is always in two change processes from small to large and from large to small in each clock cycle, and is a continuous change process. The control method solves the problems that the ripple amplitude of the output voltage of a BUCK type switching power supply under a DCM mode is increased, the frequency composition is complex, and the output end does not have the capacity ofabsorbing the current from the load.
Description
technical field [0001] The invention belongs to the technical field of switching power supply, is a new working mode of switching power supply, and can be used in BUCK type DC / DC and AC / DC switching power supply. Background technique [0002] Switching power supply (SMPS) is widely used in various electronic products and equipment, such as communication equipment, DDR memory, etc. In these applications, communication equipment usually requires the ripple of its power supply to be small enough, and the ripple can be filtered out by an external simple filter, and no matter whether the equipment is in normal working mode (requiring high output current from the power supply) or standby mode ( Requires the power supply to output a small current) has this requirement. In the power supply system of DDR memory, the power supply system is required not only to provide current to the DDR memory, but also to absorb the charge released by the DDR memory, which requires the power supply ...
Claims
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IPC IPC(8): H02M1/14
Inventor 杭中健
Owner WUXI CHIPOWN MICROELECTRONICS