A telephone set power supply management circuit
A technology for managing circuits and charging circuits, applied in battery circuit devices, circuit devices, current collectors, etc., can solve the problems of insufficient charging current of batteries, reducing battery service life, complicated circuits, etc., to increase power supply time and prolong service life , the effect of simplifying the circuit
Inactive Publication Date: 2007-08-01
宁波兰尔达通信设备有限公司
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Problems solved by technology
The improved technical solution also has one disadvantage. On the one hand, the circuit is complicated and the cost is high; The power supply time is shorter than the power supply time of three batteries; in addition, the four batteries in the above power management circuit adopt the floating charge mode, and the voltage difference is large, so there are phenomena such as insufficient charging of the battery or excessive charging current, which will greatly affect the power supply. Reduce the service life of the battery, cause damage to the battery, and cause the battery to explode or cause a fire in severe cases
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[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0018]As shown in the figure, a management circuit of a telephone power supply includes a charging circuit 1 connected to an external AC power supply AC. The charging circuit 1 includes a charging power supply 2 and a charging control circuit 3. A rechargeable battery 4 is connected behind the charging control circuit 3. Externally connected The alternating current power supply AC is connected to the load through a switching voltage stabilizing circuit 5, and the anode of the rechargeable battery 4 is connected to the input pole of the switching voltage stabilizing circuit 5 through the first diode D1. The voltage circuit chip IC1, the anode of the rechargeable battery 4 passes through the first diode D1 and then the first resistor R1 is connected to the Ipk and V-IN pins of the voltage stabilizing circuit chip IC1 in parallel, and the Drc pin ...
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The invention discloses a telephone power supply managing circuit, including a charge circuit connected with an external AC power supply, and a charge battery is connected behind the charge circuit, and its character: the AC power supply is connected with a load through a first switching voltage-stabilizing circuit, the anode of the charge battery is connected with the input pole of the switching voltage-stabilizing circuit through a first diode, the charge circuit is an intelligent limited charge circuit, the charge battery supplies the power through the switching voltage- stabilizing circuit to the load, not only overcoming various detects in existing technique as switching between power supply and battery but also simplifying the circuit, as well as reducing the cost in solving problem. The power supplying time of the battery is increased and the battery is fast to charge and saves energy and has the service life prolonged.
Description
technical field [0001] The invention relates to a power supply management circuit, in particular to a telephone power supply management circuit. Background technique [0002] Now more and more small electrical appliances use multi-cell Ni-MH / chromium multi-cell battery packs as built-in maintenance-free backup batteries, especially in mobile phones and cordless phones, which have the advantages of low cost, large capacity and long life. However, there is a big problem in the switching between the main power supply and the battery power supply in the previous circuit. Its external power supply adopts a DC switching power supply, and is provided with a first-level voltage stabilization circuit, and the battery (three sections) is connected to the voltage stabilization circuit through a diode. On the output pole, that is, to directly supply power to the load, because there is a pulse current in the RF transmitting part of the wireless phone, and the instantaneous current can re...
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Inventor 杨如祥夏志刚俞海云陈向东
Owner 宁波兰尔达通信设备有限公司