Improved battery protection system
A protection system and battery technology, applied in the direction of automatically disconnected emergency protection devices, emergency protection circuit devices, electrical components, etc., can solve the problems of actual value and design value deviation, random mismatch, VOC deviation from design value, etc., to achieve The effect of improving accuracy
Active Publication Date: 2019-04-16
ZGMICRO HEFEI LTD
View PDF6 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] In the actual production and processing of chips, due to the influence of process deviation and stress after packaging, it will lead to figure 1 The MOS (Metal-Oxide-Semiconductor) transistors M4, M1, and M2 in the battery do not match, introducing random mismatch (equivalent to mismatch voltage Vos1 and Vos2), which eventually leads to a deviation between the actual value of the charging protection threshold VOC and the design value
Simulation results show that Vos1 of + / -3mv will cause VOC to deviate from the design value +100 / -96mv, which is intolerable in high-precision design
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0014] 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.
[0015] 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. Unless otherwise specified, the words connected, connected, and joined in this document mean that they are electrically connected directly or indirectly.
[0016] Please refer to figure 2 shown, which is figure 1 The schematic diagram of the equivalent circuit of the voltage comparator is shown. The voltage comparator can ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides an improved battery protection system. The improved battery protection system comprises a positive power supply end, a negative power supply end, a battery pack, a battery protection circuit and a charging-discharging switch combination, wherein the battery protection circuit comprises a voltage comparator which is used for detecting whether the voltage of a third detectionend is more than or less than a reference threshold voltage; and the voltage comparator comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first feedback resistor, asecond feedback resistor, a third feedback resistor, a first MOS transistor, a second MOS transistor, a fourth MOS transistor, a first bipolar transistor, a second bipolar transistor and an active load. According to the improved battery protection system, the feedback resistors are provided, so that the influence of the mismatched voltage Vos on a turnover threshold can be lowered, and the influence of the mismatched voltage Vos on the turnover threshold can be kept in an acceptable range. Through adoption of the improved voltage comparator, the accuracy of the battery protection system is increased.
Description
【Technical field】 [0001] The invention relates to the technical field of electronic circuits, in particular to an improved battery protection system. 【Background technique】 [0002] There are voltage comparators and current comparators in the battery protection circuit. The voltage comparator is further divided into an overcharge voltage comparator and an overdischarge voltage comparator. With the advancement of lithium battery protection technology, the accuracy requirements for overcharge protection threshold (VOC) and overdischarge protection threshold (VOD) are getting higher and higher. Please refer to figure 1 As shown, it is a schematic circuit diagram of an overcharge voltage comparator in the prior art. The circuit structure of the overdischarge voltage comparator is similar to that of the overcharge voltage comparator, and different overcharge voltages are generated by different ratios of resistors Rd1 and Rd2. Protection threshold VOC and over-discharge protect...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/18H02H3/00
CPCH02H3/006H02H7/18
Inventor 姜伟
Owner ZGMICRO HEFEI LTD