Charging circuit, device, intelligent terminal and charging method
A charging circuit and charging voltage technology, which is applied to battery circuit devices, circuit devices, collectors, etc., can solve problems such as burnout, system chip damage, and work impact, so as to prevent battery overcharging and improve safety and reliability. Effect
Active Publication Date: 2021-01-01
深圳锐源微电子科技有限公司
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Problems solved by technology
When the battery voltage is at the full charge voltage, the transient overshoot of the system cannot exceed 100 millivolts, that is, the overshoot does not exceed 2.3%. If it exceeds this value, the system chip may be damaged or burned
[0004] For the above situation, the charging chip using the traditional voltage mode control mode and current mode control mode is prone to transient overshoot, which will cause a great impact on the work of the PMIC of the mobile smart terminal or even burn it out.
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[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0035] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.
[0036] In addition, the ...
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The invention discloses a charging circuit and device, an intelligent terminal and a charging method. The charging circuit comprises a control circuit, a switching circuit and an overcharge protectioncircuit, wherein the control circuit outputs a PWM control signal; the switching circuit converts power supply voltage output by a system power supply into preset voltage and then charges a battery according to the PWM control signal; the overcharge protection circuit judges whether the battery is in an overcharge state or not according to charging voltage of the battery, the voltage of the system power supply and set charging voltage; and if so, the overcharge protection circuit outputs an enable signal to the control circuit, so that the control circuit stops outputting the PWM control signal. According to the charging circuit, the charging security and reliability can be improved.
Description
technical field [0001] The invention relates to the technical field of charging, in particular to a charging circuit, device, intelligent terminal and charging method. Background technique [0002] In existing smart mobile terminals, power is supplied by an integrated PMIC (Power Management IC, power management chip). For example, MediaTek's MT6328 and other series of PMICs have a maximum withstand voltage range of 4.5V for the PMIC power input pins. As the full charge voltage of lithium batteries is getting higher and higher, the full charge voltage of 4.4V has become the current mainstream lithium battery parameter. [0003] Therefore, high requirements are placed on the transient overshoot voltage of the above-mentioned system voltage. When the battery voltage is fully charged, the transient overshoot of the system cannot exceed 100 millivolts, that is, the overshoot does not exceed 2.3%. If it exceeds this value, the system chip may be damaged or burned. [0004] For ...
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IPC IPC(8): H02J7/00
Inventor 张玲玲
Owner 深圳锐源微电子科技有限公司