Dual-protection circuit for short circuit of batteries
A double protection, battery technology, applied in the direction of secondary battery repair/maintenance, etc., can solve the problems of products not working normally, difficult to realize, etc.
Pending Publication Date: 2019-03-15
SHENZHEN RUIDE ELECTRONICS IND
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Problems solved by technology
But after protection, in order to restore normal output again, it is necessary to completely remove the load, that is, remove all loads behind the battery protection chip 10, such as resistors, capacitors, etc.; or recharge to restore normal output; however, in general , because the products have been pre-assembled, it is difficult to remove all the loads; if you do not bring a charger with you or the charger you bring out does not work normally, then after a short circuit occurs, it is possible cause the product not to work properly
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[0010] The present invention will be described below in conjunction with specific cases.
[0011] The present invention provides a battery short-circuit dual protection circuit, including a battery protection chip 1, a charging MOS transistor 2 and a discharging MOS transistor 3, and a first resistance R1 formed by a first resistor R1 connected in parallel between the SRP pin and the SRN pin of the battery protection chip 1. A protection circuit; when the battery protection chip 1 detects that the ground current of the battery 5 is higher than the short-circuit threshold value, the battery protection chip 1 controls the charging MOS tube 2 and the discharging MOS tube 3 to disconnect; it also includes a first P-channel insulation The second protection circuit composed of the gate field effect transistor Q2 and the control circuit 6, the gate of the first P-channel insulating gate field effect transistor Q2 is connected to the output end of the control circuit 6, and the gate of...
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The invention discloses a dual-protection circuit for short circuit of batteries. The dual-protection circuit comprises a battery protection chip, a charging MOS tube, a discharging MOS tube, a firstprotection circuit and a second protection circuit, wherein the first protection circuit is formed by a first resistor connected between an SRP pin and an SRN pin of the battery protection chip in parallel; when the batter protection chip detects that the earth current of a battery is higher than a short circuit threshold value, the battery protection chip controls the charging MOS tube and the discharging MOS tube to be disconnected; the second protection circuit is formed by a first P channel insulated gate field effect tube and a control circuit; a gate of the first P channel insulated gatefield effect tube is connected with an output end of a control circuit; a source of the first P channel insulated gate field effect tube is connected with the anode of the battery; and the control circuit preferably disconnects the first P channel insulated gate field effect tube. The dual-protection circuit has a dual-protection function and is capable of avoiding the trouble that the traditional circuits only can return to work through removing loads or being recharged.
Description
technical field [0001] The invention relates to a battery short-circuit protection circuit, in particular to a battery short-circuit double protection circuit. Background technique [0002] Traditional battery short-circuit protection circuits such as figure 2 As shown, when the battery protection chip 10 detects that the ground current of the battery 50 is lower than the undervoltage threshold, the battery protection chip 10 controls the charging MOS transistor 20 and the discharging MOS transistor 30 to disconnect to protect the battery 50 . But after protection, in order to restore normal output again, it is necessary to completely remove the load, that is, remove all loads behind the battery protection chip 10, such as resistors, capacitors, etc.; or recharge to restore normal output; however, in general , because the products have been pre-assembled, it is difficult to remove all the loads; if you do not bring a charger with you or the charger you bring out does not wo...
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Login to View More IPC IPC(8): H01M10/42
CPCH01M10/42Y02E60/10
Inventor 何长春万益明张永胜
Owner SHENZHEN RUIDE ELECTRONICS IND