Timing protection circuit for battery charging

• Main Authors: ZHUANG ZONGREN, ZHANG JUNWEI, WENG SHIFANG
• Format: Patent
• Language: Chinese; English
• Published: 07.01.2009
• Subjects: BASIC ELECTRONIC CIRCUITRY; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION; PULSE TECHNIQUE; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention provides a battery charge timing protection circuit, comprising a battery body, an external charging circuit, a battery protection chip and peripheral circuits. The peripheral circuits comprise field effect transistors Q1 and Q2, resistances R1 and R2 and capacitances C1, C2 and C3. The resistance R1 and the capacitance C1 provide stable working power supply for the battery protection chip, and the capacitance C3 is used for setting delay time for an overcharge delay trigger end Ct of the battery protection chip. The circuits also comprise a charge timing circuit, which comprises an amplified delay circuit which consists of a crystal triode Q3, a capacitance C4 and resistances R7, R8 and R9, and a charge time is set. When the set charge time is reached, the charge timing protection circuit outputs a second high level signal to charge the capacitance C3, and the capacitance C3 triggers an overcharge control terminal C of the battery protection chip and outputs a low level signal to control the fi