Power supply circuit for saving chip layout area
A power supply circuit and circuit technology, which is applied to battery circuit devices, circuit devices, collectors, etc., can solve the problems of high cost, large circuit volume, and large number of high-voltage switch tubes, so as to reduce the volume of the circuit and the volume of the chip , The effect of reducing the circuit cost
Active Publication Date: 2022-07-22
SUZHOU BATELAB MICROELECTRONICS
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Problems solved by technology
[0004] In view of this, the embodiment of the present invention provides a power supply circuit for saving chip layout area, so as to solve the problem that when the battery charging circuit is just powered on, since the module power supply circuit does not generate an output voltage, only one high-voltage switch tube can be used for the power supply. The power supply of each module leads to a large number of high-voltage switch tubes, which leads to the problem of large circuit size and high cost
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[0038] In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.
[0039]It should be noted that the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device comprising a series of elements includes not only those elements, but also no Other elements expressly listed, or which are also inherent to such a...
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The invention discloses a power supply circuit for saving chip layout area, which comprises a first circuit module, a second circuit module, a current mirror module and a power supply module, the input end of the first circuit module is connected with a power supply and the output end is used for outputting first fixed voltage; the second circuit module comprises a first switch tube, a second switch tube, a third switch tube and a first resistor, the controlled end of the second switch tube is connected with the output end of the first circuit module, the controlled end of the first switch tube is connected with the reference voltage output end of the reference voltage module, and the controlled end of the third switch tube is connected with the power supply module; the input ends of the first switch tube, the second switch tube and the third switch tube are connected with a power supply, and the output ends are grounded through a first resistor; the current mirror module is used for mirroring current on the second switching tube or current on the first switching tube to the third switching tube, the input end of the power supply module is connected with a power supply, and the output end outputs power supply voltage. The circuit size can be reduced, and the circuit cost is reduced.
Description
technical field [0001] The invention relates to the technical field of battery power supply, in particular to a power supply circuit for saving chip layout area. Background technique [0002] In related technologies, such as figure 1 The shown battery power supply circuit charges the battery, and the input power supplies the battery load after passing through the input terminal, the power frequency transformer, the rectifier filter circuit, the charging circuit (ie, the battery charging circuit) and the output filter circuit in sequence. [0003] At present, a relatively common battery charging circuit is usually composed of an integrated circuit control chip and an external circuit of the control chip, wherein the integrated circuit control chip usually includes a module power supply circuit that supplies power to each module in the integrated circuit control chip. The module power supply circuit in the common integrated circuit control chip, such as figure 2 As shown, t...
Claims
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IPC IPC(8): H02J7/00
CPCH02J7/007
Inventor 不公告发明人
Owner SUZHOU BATELAB MICROELECTRONICS