JPS5825734Y2 - Battery power supply circuit to prevent incorrect charging - Google Patents

Description

[Detailed description of the invention] The present invention 6 relates to a battery power supply circuit for preventing erroneous charging.

In recent years, with the development of secondary batteries, so-called rechargeable batteries, many electronic devices have been manufactured using rechargeable power supply circuits.

In general, this type of electronic equipment can also use ordinary primary batteries, so-called dry batteries, etc. For example, instead of one rechargeable battery, it is now possible to insert four single dry batteries or connect them in series. ing.

Therefore, it is inevitably necessary to prevent the charging circuit from working when using dry batteries, and currently, secondary batteries used in electronic devices have a charging-only terminal connected to the + terminal in addition to the main electrode terminal. When using this secondary battery, it is connected to the charging system with a charging-only terminal, or when using dry batteries, it is designed so that it is not connected to the charging system because it does not have a charging-only terminal. There is.

However, if you use one of the above secondary batteries, it is fine, but
Depending on the electronic device, it is often necessary to connect two of these in series (in this case, as shown in Figure 1, the connection path between batteries A and B must be connected to the battery B in the latter stage). A circuit is constructed between the respective connection terminals 4 and 6 so as to conduct electricity from the live electrode terminal 1 to the life electrode terminal 3 of the battery A in the previous stage via the diodes D o ', 5, and a terminal dedicated for charging the battery B in the latter stage. A circuit is constructed between the respective connection terminals 5, 6, and 0) so that the terminals 2 and 3 of the battery A in the previous stage are directly connected, and then connected to the terminal 1 of the battery A in the previous stage. The contact terminal I connects the contact terminal I to the main electrode terminal 3 of the Q batteries BCQ in the previous stage, and the opening force and discharge 'lJM pressure and current are obtained from the contact terminal 9, and also to the charge-only terminal 2 of the battery A in the previous stage. A charging current is made to flow from the contact connection terminal 7 to the contact Φ connection terminal 7 to the life electrode terminal 3 of the battery B in the subsequent stage.

In this way, if a secondary battery with a charging-only terminal is used, the fall of the front and rear stages will not be a problem, and if dry batteries are inserted in one or both, the rear stage will now fall down, as shown in Figure 2. 0) When using batteries or dry batteries, there is no charging terminal, so charging current does not flow, and since there is a backflow prevention diode Do on the side of the Chisei electrode terminal 1, it does not flow, preventing erroneous charging.
When the battery in the front stage is a dry battery, as is clear from FIGS. 1 and 2, no charging current flows, and similarly, when both the front stage and the rear stage are dry batteries, no charging current flows at all.

However, in this case, if the subsequent battery is a dry battery, a diode Do will be inserted in series in the circuit when used as a power source, resulting in a voltage drop of approximately 0.6V.

Therefore, the present invention aims to provide a battery power supply circuit that prevents erroneous charging without causing such a voltage drop, and is equipped with a Chisei electrode terminal 1 and a Chisei electrode terminal 3, as shown in FIG. In addition, as a device for charging and discharging two secondary batteries A and B equipped with charging-only terminals 2 connected to the Sensei electrode terminal 1 in series, the connection terminal 6 for lifetime electrode terminals in the former stage and the connecting terminal 6 for lifetime electrode terminals in the latter stage are used. The connection terminal 4 for the Senshu electrode terminal is connected to the connecting terminal 4 for the Senshu electrode terminal, and the discharging voltage and current are supplied using the connecting terminal 7 for the Senshu electrode terminal in the previous stage and the connecting terminal 9 for the Issei electrode terminal in the latter stage, and the charging power source The + side of is the emitter collector of the PNP switching transistor Tr, and the backflow prevention diode D.
The charging-only terminal connection terminal 8 of the previous stage is connected via p and resistor R1.
and its PNP switching transistor T
The base of the transistor Tr is connected to the connecting terminal 5 for the charge-only terminal in the subsequent stage through the resistor R2, and a resistor R3 is connected between the base and the emitter of the same transistor Tr, and the connecting terminal 9 for the lifelong electrode terminal in the subsequent stage is connected. The wire is connected to one side of the charging power source, and the connection terminal 4 is connected between the + main electrode terminal connection terminal 7 in the previous stage and the lifetime electrode terminal connection terminal 6, and the connection terminal 4 for the Senshu electrode terminal in the latter stage.
The structure is such that a dry battery can be connected between the terminal and the permanent electrode terminal connection terminal 9 in place of the secondary battery.

Note that the resistance value of the resistor R1 is set depending on the required rechargeable battery, and the resistance value M3 . ．． It is set in accordance with the base current required for the PNP switching transistor Tr.

With the above configuration, if both the front and rear stages are secondary batteries A and B, the switching transistor Tr receives the base current from the charging power source and connects ONL, the transistor Tr, the backflow prevention diode Dp, and the resistor R1. However, if the secondary battery B in the latter stage is now replaced with a dry cell battery, it does not have a charging-only terminal, so the base current circuit of the switching transistor Tr is cut off, and the base current flows. Since there is no such transistor, the transistor Tr is O.
It becomes an FF state and charging current does not flow.

Also, if the secondary battery A in the previous stage is replaced with a dry battery,
Since the charging circuit itself is cut off, the battery will not be charged.

Therefore, if one or both of the batteries are dry batteries, they will not be charged.

In the case of discharging, the connection terminals 7 and 9 are connected to the Sensei electrode terminal 1 and the Issei electrode terminal 3 of the previous battery and the latter battery, respectively.
The discharge voltage and current can be obtained through.

Therefore, according to the present invention, if either or both of the batteries in the first and second stages are dry batteries, the charging current is automatically cut off to prevent erroneous charging, and when using dry batteries, During discharging, no diode is inserted into the electrical path, and no unnecessary voltage drop occurs due to the diode.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a prior art battery power supply circuit for preventing erroneous charging, and FIG. 2 is a circuit diagram of another usage example in the case of FIG. 1.
FIG. 3 is a circuit diagram showing an embodiment of the battery power supply circuit for preventing erroneous charging according to the present invention. 1... Sensei electrode terminal, 2... Charging only terminal, 3... - raw electrode terminal, 4, 5, 6, 7,
8, 9...Connection terminal, Tr...PNP
type switching transistor, Dp... Diode for backflow prevention, R1゜R2, R3... Resistor.

Claims (1)

[Scope of utility model registration request] +In addition to being equipped with a main electrode terminal 1 and a life electrode terminal 3, two secondary batteries A and B, which are equipped with a charge-only terminal 2 connected to the life electrode terminal 1, are charged and discharged in series. , connect the connection terminal 6 for one main electrode terminal in the previous stage and the connection terminal 4 for the Senshu electrode terminal in the latter stage, and discharge using the connection terminal 7 for the Senshu electrode terminal in the former stage and the connection terminal 9 for the main electrode terminal in the latter stage. It is configured to supply voltage and current, and the + side of the charging power source is connected to the charging-only terminal connection terminal 8 in the previous stage via the emitter collector of the PNP switching transistor Tr, the backflow prevention diode Dp, and the resistor R1. Then, the base of the PNP type switching transistor Tr is connected to the connecting terminal 5 for the charge-only terminal in the subsequent stage via the resistor R2, and a resistor R3 is connected between the base and emitter of the transistor Tr, Connect the connection terminal 9 for the lifetime electrode terminal to one side of the charging power source, and then connect the connection terminal 7 for the + main electrode terminal in the previous stage and the connection terminal 6 for the lifetime electrode terminal, and for the connection terminal for the life electrode terminal in the subsequent stage. A battery power supply circuit for preventing erroneous photoelectric discharge, characterized in that it is configured such that a dry battery can be connected between the connection terminal 4 and the connection terminals 9 and 0 for permanent electrode terminals in place of the above-mentioned secondary battery.