CN1138768A

CN1138768A - battery charger

Info

Publication number: CN1138768A
Application number: CN95107029A
Authority: CN
Inventors: 陈维德; 魏东隆
Original assignee: Acer Computer Co Ltd
Current assignee: Acer Computer Co Ltd
Priority date: 1995-06-20
Filing date: 1995-06-20
Publication date: 1996-12-25

Abstract

A battery charger, comprising: a charging base, a charging source, a delay switch device with a start delay circuit and a first switch set, a switching device with a flip-flop and a second switch set. Firstly, the positive and negative polarities of the rechargeable battery are detected by the flip-flop, so that the adjustment of the polarity of the charging source relative to the polarity of the rechargeable battery is completed by the second switch group. By means of the action of the start delay circuit, when the rechargeable battery is set in the charging seat, the first switch set is controlled to conduct the charging loop after delaying for some time to ensure the regulation of the polarity is completed, so that the rechargeable battery is charged with correct polarity and no damage to the rechargeable battery caused by reverse connection of the polarity.

Description

Battery charger

The present invention relates to a kind of charger unit, refer to a kind of battery charger especially.

Common mobile phone, family expenses short-distance wireless phone all need use rechargeable battery, can provide user one to improve environment for use most.

The charger unit of knowing, as shown in Figure 1, a charging source 20 provides rechargeable battery 70 chargings required electric power, and the polarity of rechargeable battery must correctly be connected to the charging source, and is just chargeable, as careless reversal connection, easily damages battery, causes user's inconvenience greatly and loss.

In view of this, the object of the present invention is to provide a kind of battery charger, make rechargeable battery when charging, the reversal connection because of polarity does not damage, and still can charge normal.

A kind of battery charger provided by the invention, has a charging source, this charging source has a positive pole, a negative pole, this battery charger has one first end points, second end points provides respectively contacts to charge with an anode of battery, a negative terminal, this battery charger comprises: one postpones switching device, and it has one first end points and one second end points becomes electric to link respectively with first end points, second end points of battery charger; One switching device shifter, it link to postpone switching device and charging source for electric, its in response to aforementioned first end points, second end points respectively with the anode of battery, a contact relation of negative terminal, optionally be first switching state or second switching state; Wherein, in response to aforesaid contact relation, postpone switching device after aforementioned switching device shifter is finished change action, make its first end points and second end points become electric to link with positive pole, the negative pole in charging source respectively, no matter the contact relation of first end points of anode, negative terminal and the battery charger of battery, second end points is a direction why, charging source anodal permanent becomes the electric connection relationship with the anode of battery, the negative pole perseverance in the source of charging becomes the electric connection relationship with the negative terminal of battery.

By with reference to the accompanying drawings to the detailed description of preferred embodiment, make purpose of the present invention, feature, and advantage will be more obvious.

Brief Description Of Drawings:

Fig. 1 is the circuit diagram of the charger unit known.

Fig. 2 is the circuit diagram of battery charger of the present invention.

A kind of battery charger provided by the invention as shown in Figure 2, comprises: a cradle 1, one charging source 2, one first switches set (31,32,33), a second switch group (41,42,43), a flip-flop 5, a start delay circuit (61,62).

The present invention makes rechargeable battery not because of the reversal connection of polarity damages, and at first utilizes flip-flop to detect positive and negative polarity earlier, finishes the adjustment of charging source with respect to the polarity of rechargeable battery to utilize second switch group (41,42,43).For the adjustment of guaranteeing its polarity finishes, so utilize the start of start delay circuit (61,62), as long as there is rechargeable battery to insert cradle, just postpone a period of time earlier, just control first switches set (31,32,33) with the charge circuit conducting, charge so that be able to the correct polarity collocation.

Cradle 1 has one first end points 11, one second end points 12, and rechargeable battery 71 places this cradle during the desire charging.

Charging source 2 has a positive pole (for positive voltage), a negative pole (for negative voltage), and the power supply of charging usefulness is provided, and is a direct current power supply.

Postponing switching device, is to be made of start delay circuit (61,62), first switches set (31,32,33).Postpone switching device, it has one first end points and one second end points is made up of first switch 32 and the second switch 33 of first switches set.

Switching device shifter is to be made of flip-flop 5, second switch group (41,42,43).

First switches set (31,32,33) is to constitute with relay, and the composition of relay comprises first control element 31, first switch 32, second switch 33.First control element 31 is subjected to the control of transistor Q1, delay element R1, C1, makes first switch 32 and second switch 33 cut a contact under separately synchronously with the charge circuit conducting.

Second switch group (41,42,43) is to constitute with relay, and the composition of relay comprises second control element 41, the 3rd switch 42, the 4th switch 43.Second control element 41 is subjected to the control of flip-flop 5, and the 3rd switch 42 and the 4th switch 43 are cut synchronously to affiliated separately C contact (first state) or d contact (second state).Wherein the 3rd switch and the 4th switch and first switch and second switch are staggered is connected, and as shown in Figure 2, with its staggered relation that is connected, arrangement is as table one now.

Table one: the staggered relation that is connected of each switch

	The c contact	The d contact
	The c contact	The d contact	The 3rd switch	Be connected to the first switch a point	Be connected to second switch a point
The 4th switch	Be connected to second switch a point	Be connected to the first switch a point	The 3rd switch	Be connected to the first switch a point	Be connected to second switch a point

Flip-flop 5, is gone into end and is included set input S, replacement input R, output Q at its output.

When rechargeable battery is put situation as B, set input S is a high potential, and replacement input R is an electronegative potential, and then output Q is output as high potential, make second control element, 41 upper reaches overcurrent (relay suction magnetic), the 3rd switch 42 and the 4th switch 43 are cut synchronously to affiliated separately d contact.Afterwards, treat switch (32, the 33) conducting of first switches set after, the anode of rechargeable battery 71 can obtain the positive voltage in charging source 2, so rechargeable battery charges smoothly under the correct situation of polarity.

When rechargeable battery is put as A kind situation, set input S is an electronegative potential, and replacement input R is a high potential, and then output Q is output as electronegative potential, making does not have current flowing (relay is not inhaled magnetic) on second control element 41, the C contact under the 3rd switch 42 and the 43 equal switchbacks of the 4th switch separately.After treating switch (32, the 33) conducting of first switches set afterwards, the anode of rechargeable battery 71 can obtain the positive voltage in charging source 2, so rechargeable battery charges smoothly under the correct situation of polarity.

Start delay circuit (61,62), by or door (OR gate) 61 and delay circuit 62 constitute, in case when rechargeable battery places on the cradle, regardless of the polarity of rechargeable battery, or door 61 input must have one to be high potential, or the output of door 61 is output as high potential and gives delay circuit 62.High potential makes transistor Q1 conducting after a time of delay (according to R1, C1 value), first control element 31 has electric current to flow through (relay suction magnetic), first switch 32 and second switch 33 are cut synchronously to its affiliated separately a contact, the loop of charging so conducting, and rechargeable battery begins charging.

The present invention is a kind of battery charger, when reality is implemented, rechargeable battery places on the cradle the two kinds of situations of A, B just like Fig. 2, at first the effect because of flip-flop 5 is finished second switch group (41,42,43) action earlier, start delay circuit (61,62) just makes first switches set (31,32,33) action afterwards, after this two switches set action is finished, the work of just charging, its charge path division is as follows:

1, A kind situation, promptly switching device shifter is first switching state.The positive pole in charging source 2 through the c contact of the 3rd switch 42, is given the anode of rechargeable battery through a contact of first switch 32; The negative pole in charging source 2 through the c contact of the 4th switch 43, is given the negative terminal of rechargeable battery through a of second switch 33 contact.

2, B kind situation, promptly switching device shifter is second switching state.The anode in charging source 2 through the d contact of the 3rd switch 42, is given the positive pole of rechargeable battery through a of second switch 33 contact; The negative pole in charging source 2 through the d contact of the 4th switch 43, is given the negative terminal of rechargeable battery through a contact of first switch 32.

Claims

1, a kind of battery charger, has a charging source in the battery charger, this charging source has a positive pole, a negative pole, and battery charger has one first end points, second end points and contacts to charge for an anode, a negative terminal of battery respectively, it is characterized in that: comprise

One postpones switching device, and it has one first end points (32) and one second end points (33) becomes electric to be connected with first end points (11), second end points (12) of battery charger respectively;

One switching device shifter, it is connected with charging source one-tenth electric for postponing switching device, its in response to described first end points (11), second end points (12) respectively with the anode of battery, a contact relation of negative terminal, optionally be first switching state or second switching state;

Wherein, in response to described contact relation, postpone switching device after described switching device shifter is finished change action, make its first end points (32) and second end points (33) become electric to link with positive pole, the negative pole in charging source respectively, no matter the contact relation of first end points (11) of anode, negative terminal and the battery charger of battery, second end points (12) is a direction why, charging source anodal permanent becomes the electric connection relationship with the anode of battery, the negative pole perseverance in the source of charging becomes the electric connection relationship with the negative terminal of battery.