Charging circuit provided with current protection circuit
A current protection and charging circuit technology, applied in battery overcurrent protection, safety/protection circuits, battery circuit devices, etc., can solve problems such as large charging current and chip damage, and achieve the effect of avoiding chip damage
Active Publication Date: 2017-12-19
NANJING ZGMICRO CO LTD
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- Application Information
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Problems solved by technology
If the RSET resistance value is abnormal or there is a short circuit between this pin and the ground, it will cause a very large charging current, which will easily cause chip damage
Method used
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[0028] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0029] Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.
[0030] Please refer to figure 2 As shown, it is a schematic circuit diagram of the charging circuit in the first embodiment of the present invention. figure 2 The charging circuit shown is a linear charging circuit, which includes a charging control circuit 210 and a current protection circuit 220 .
[0031] The charging...
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The invention provides a charging circuit provided with a current protection circuit. The charging circuit comprises the current protection circuit and a charging control circuit; the power supply end of the charging control circuit is connected with a voltage source while the output end is connected with a to-be-charged device; the charging control circuit comprises an external resistor; the external resistor is connected between a connecting pin of the charging control circuit and a grounding end; the external resistor is used for setting the charging current output by the charging control circuit; when the external resistor is in a normal state, the current protection circuit does not act and the charging current output by the charging control circuit is set by the external resistor; and when the external resistor is in an abnormal state, or when the connecting pin connected with the external resistor suffers from short circuit, the charging current output by the charging control circuit is set by the current protection circuit. Compared with the prior art, the current protection circuit is additionally provided, so that when the external resistor is in an abnormal state or when the connecting pin connected with the external resistor suffers from short circuit, the charging current can be limited by the current protection circuit, thereby avoiding damage of a chip.
Description
【Technical field】 [0001] The invention relates to the technical field of charging circuits, in particular to a charging circuit provided with a current protection circuit. 【Background technique】 [0002] In the application of the charger chip, an external resistor is usually required to set the charging current, and the chip determines the threshold of the charging current by detecting the impedance of the external resistor. [0003] Such as figure 1 As shown, it is a schematic circuit diagram of a traditional linear charger chip. The linear charger chip includes PMOS transistors M1, M2, M3, resistors R1, R2, RSET, and operational amplifiers VA, CA, MA. The basic principle is: RSET It is an external resistor, which is used to set the threshold value of the charging current; the current of the output terminal VOUT is provided by the PMOS transistor M2, which is proportional to the PMOS transistor M1 (assumed to be K1); the input terminals of the operational amplifier MA are ...
Claims
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IPC IPC(8): H02J7/00
CPCH02J7/0029H02J7/00304
Inventor 田文博常星王钊
Owner NANJING ZGMICRO CO LTD