Switching power supply converter and circuit capable of improving charge pump charge-discharge current match degree
A charging and discharging current and matching technology, which is applied in the field of switching power converters and circuits for improving the matching of charging and discharging currents of charge pumps, and can solve problems such as the mismatch between charging and discharging currents of transistors
Active Publication Date: 2015-03-25
HANGZHOU SILAN MICROELECTRONICS
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Problems solved by technology
[0006] The technical problem to be solved by the present invention is to provide a switching power converter and a circuit for improving the matching degree of charging and discharging current of the charge pump, which can solve the problem of the mismatch between the charging current and the discharging current caused by the deviation between transistors
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[0039] The present invention will be further described below in conjunction with specific embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.
[0040] refer to image 3 , The circuit for improving the matching degree of charge pump charge and discharge current in this embodiment includes: a first current mirror array 1, a first current cycle switching array 2, a charging and discharging switch 3, a third current cycle switching array 4, a second current cycle switching array 5 , a second current mirror array 6 and a reference current source 7 .
[0041] Wherein, the reference current source 7 outputs a reference current, which may adopt any suitable reference current source structure in the prior art.
[0042] The first current mirror array 1 is used to mirror the reference current output by the reference current source 7 into two first mirror currents equal to the reference current, and the first current mir...
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The invention provides a switching power supply converter and a circuit capable of improving charge pump charge-discharge current match degree. The circuit capable of improving charge pump charge-discharge current match degree comprises a first current mirror array which divides a reference current into two first image currents which are equal to the reference current in a mirror image mode, a first current circulation switchover array which enables the two first image currents be circularly switched, a second current mirror array which comprises a plurality of current sources, a second current circulation switchover array, a third current circulation switchover array and a charge-discharge switch which charges or discharges an electric capacity. The second current circulation switchover array enables the plurality of current sources in the second current mirror array to be circularly switched, thereby enabling the plurality of the current sources to alternately serve as a reference source and an output source of a current mirror. The third current circulation switchover array enables two circulating current output ends of the second current circulation switchover array to be circularly switched, thereby enabling the two circulating current output ends to alternately serve as an input end and an output end of the current mirror. The witching power supply converter and the circuit capable of improving charge pump charge-discharge current match degree are capable of solving the problem of mismatch of a charge current and a discharge current caused by deviation between transistors.
Description
technical field [0001] The invention relates to charge pump technology, in particular to a switching power converter and a circuit for improving the matching degree of charging and discharging current of the charge pump. Background technique [0002] At present, in the switching power converter circuit, the constant current output is widely controlled by controlling the proportional relationship between the charging and discharging current of the charge pump. [0003] figure 1 A charge and discharge circuit of a CMOS charge pump in the prior art is formed by connecting a plurality of cascode transistors. Wherein, the reference current I0 is mirrored into a charging reference current I1 and a discharging current Idisch, and the charging reference current I1 is mirrored into a charging current Ich. Due to the poor matching of CMOS devices, there is a large mismatch between the charging current Ich, the discharging current Idisch and the reference current Iin. [0004] fig...
Claims
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IPC IPC(8): H02M3/07
Inventor 严先蔚
Owner HANGZHOU SILAN MICROELECTRONICS