CN107425593A - Multivoltage battery parallel circuit - Google Patents

Abstract

The invention relates to a multi-voltage battery parallel circuit, which includes a plurality of battery circuit units connected in parallel, each battery circuit unit includes a battery, a battery switch circuit, and a voltage determination circuit; the battery is connected in series with the battery switch circuit, and the battery switch circuit is used for Control whether the corresponding battery circuit is connected; the voltage judging circuit is set between the battery and the battery switch circuit, and the voltage judging circuit is used to compare the battery voltages of multiple battery circuit units, and control the battery switch circuit connected to the battery with the higher voltage conduction. The advantage of the present invention is that when the voltages of multiple batteries are equal, the power supply is jointly provided by multiple batteries; when the voltages of multiple batteries are not equal, the voltage determination circuit connected to each battery compares the current battery voltage to control The higher voltage battery switch circuit is turned on, and the higher voltage battery among the multiple batteries is connected, so that the seamless switching of parallel batteries can be realized, and the battery can be prevented from being reversely charged.

Description

Multi-voltage battery parallel circuit

technical field

The invention relates to the field of battery power supply, in particular to a multi-voltage battery parallel circuit.

Background technique

With the advancement of technology, electronic devices have become an indispensable part of our daily life, such as mobile phones or laptop computers, and the most important condition for the use of electronic devices is the power supply. Currently, the commonly used power supply for electronic devices is batteries.

Taking notebook computers as an example, notebook computers generally have two power supply methods, one is powered by an external power adapter, and the other is powered by a built-in lithium battery. hours.

Therefore, in order to achieve long-term power supply, it is generally used to install more batteries to provide power by adding a battery slot. If multiple batteries are connected in series, the operation must be performed when the device is turned off. If multiple batteries are connected in parallel, each battery needs to be connected in series with a switch, and the two batteries are connected in parallel, and the electronic device can be powered by one battery by turning on any switch. This method can only be powered by one battery at a time. Power supply cannot support hot swapping of batteries. If you want to replace the battery, you must turn off the power of the device before proceeding.

Contents of the invention

The object of the present invention is to provide a multi-voltage battery parallel circuit for the above technical problems.

The technical solution of the present invention is: a multi-voltage battery parallel circuit, including a plurality of battery circuit units connected in parallel, each battery circuit unit includes a battery, a battery switch circuit, and a voltage determination circuit; the battery and the battery switch The circuits are connected in series, and the battery switch circuit is used to control whether the corresponding battery circuit is connected; The battery voltages are compared, and the battery switch circuit connected to the higher battery voltage is controlled to conduct.

Preferably, the voltage determination circuit includes a voltage comparison circuit and 4 voltage dividing resistors with equal resistance; the voltage comparison circuit includes a non-inverting input terminal, an inverting input terminal and a comparison output terminal, and the 4 voltage dividing resistors They are the same phase voltage divider resistor, the reverse phase voltage divider resistor, the ground voltage divider resistor and the negative pole voltage divider resistor; the same phase voltage divider resistor is set between the positive pole of the battery and the same phase input terminal, The resistor is set between the positive pole of the battery and the inverting input terminal, the ground voltage dividing resistor is set between the non-inverting input terminal and ground, and the negative voltage dividing resistor is set between the inverting input terminal and the ground. between the negative poles of the battery.

Preferably, the battery switch circuit adopts an NMOS switch tube, the gate G of the NMOS switch tube is connected to the comparison output terminal, the drain D of the NMOS switch tube is connected to the negative pole of the battery, and the NMOS switch tube The source of S is grounded.

Preferably, the battery, battery switch circuit and voltage determination circuit of each battery circuit unit are the same.

Preferably, the battery switch circuit and the voltage determination circuit of each battery circuit unit are the same.

Preferably, the multi-voltage battery parallel circuit includes two battery circuit units, namely a first battery circuit unit and a second battery circuit unit; the voltage of the first battery B1 of the first battery circuit unit is greater than that of the second battery circuit unit. When the voltage of the second battery B2 of the battery circuit unit is high, the first comparison output terminal of the first battery circuit unit outputs a high level, and the first battery switch circuit Q1 of the first battery circuit unit is turned on; and the first battery circuit unit The second comparison output terminal of the second battery circuit unit outputs a low level, and the second battery switch circuit Q2 of the second battery circuit unit is turned off.

Preferably, the multi-voltage battery parallel circuit includes two battery circuit units, namely a first battery circuit unit and a second battery circuit unit; the voltage of the first battery B1 of the first battery circuit unit is lower than that of the second battery circuit unit. When the voltage of the second battery B2 of the battery circuit unit is high, the first comparison output terminal of the first battery circuit unit outputs a low level, and the first battery switch circuit Q1 of the first battery circuit unit is cut off; and the second battery circuit unit The second comparison output terminal of the battery circuit unit outputs a high level, and the second battery switch circuit Q2 of the second battery circuit unit is turned on.

Preferably, the multi-voltage battery parallel circuit includes two battery circuit units, namely a first battery circuit unit and a second battery circuit unit; the voltage of the first battery B1 of the first battery circuit unit is equal to that of the second battery circuit unit. When the voltage of the second battery B2 of the battery circuit unit is high, the first comparison output terminal of the first battery circuit unit outputs a high level, and the first battery switch circuit Q1 of the first battery circuit unit is turned on; and the first battery circuit unit The second comparison output terminal of the second battery circuit unit outputs a high level, and the second battery switch circuit Q2 of the second battery circuit unit is turned on.

The beneficial effects of the present invention compared with prior art are:

1) The present invention provides a multi-voltage battery parallel circuit, which includes a plurality of battery circuit units connected in parallel, and when the voltages of the batteries are equal, the batteries are jointly powered; when the voltages of the batteries are not equal, each The voltage judging circuit connected to each battery compares the current battery voltage, controls the higher voltage battery switch circuit among multiple batteries to conduct, and connects the higher voltage batteries among multiple batteries to realize seamless switching of parallel batteries , to prevent battery reverse charging, and support battery hot swap;

2) The multi-voltage battery parallel circuit of the present invention can automatically judge the batteries used when the voltages of multiple batteries are not equal, and if the battery voltages are the same, then multiple batteries work simultaneously;

3) The multi-voltage battery parallel circuit of the present invention can also realize the function of preventing the battery from being reversely connected when the battery is reversely connected.

Description of drawings

Figure 1 is a schematic structural diagram of a multi-voltage battery parallel circuit;

Fig. 2 is a schematic structural diagram of a battery parallel circuit composed of two battery circuit units.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

Referring to Fig. 1, the present invention discloses a multi-voltage battery parallel circuit, including a plurality of battery circuit units connected in parallel, each battery circuit unit includes a battery, a battery switch circuit, and a voltage determination circuit; wherein, the battery and the battery switch circuit are connected in series , used to control whether the corresponding battery circuit is connected or not. The voltage judging circuit is arranged between the battery and the battery switch circuit, and is used for comparing the voltage of the corresponding battery and controlling the battery switch circuit of the corresponding battery to be turned on or off.

Wherein, the voltage judging circuit includes a voltage comparing circuit and four voltage dividing resistors with equal resistances. The voltage comparison circuit includes a non-inverting input terminal, an inverting input terminal and a comparison output terminal, and the four voltage dividing resistors are respectively a non-inverting voltage dividing resistor, an inverting voltage dividing resistor, a grounding voltage dividing resistor and a negative voltage dividing resistor. Wherein, the non-inverting voltage dividing resistor is set between the positive pole of the corresponding battery and the non-inverting input terminal, the anti-phase voltage dividing resistor is set between the corresponding battery positive pole and the inverting input terminal, and the grounding voltage dividing resistor is set between the non-inverting input terminal and the ground. The negative pole voltage dividing resistor is arranged between the inverting input terminal and the corresponding negative pole of the battery.

The battery switch circuit adopts an NMOS switch tube, the gate G of the NMOS switch tube is connected to the comparison output terminal, the drain D of the NMOS switch tube is connected to the corresponding negative electrode of the battery, and the source S of the NMOS switch tube is grounded. When the comparison output terminal outputs a high level, the NMOS switch tube is turned on, connecting the corresponding battery circuit; when the comparison output terminal outputs a low level, the NMOS switch tube is turned off, and the corresponding battery circuit is not connected.

It should be noted that a plurality of battery circuit units in the present invention are connected in parallel, and the structures of the battery switch circuit and the voltage determination circuit in each battery circuit unit are exactly the same, and the present invention does not limit whether the battery voltages in each battery circuit unit are the same or not. When the voltages of multiple batteries are equal, the power is supplied by multiple batteries; when the voltages of multiple batteries are not equal, the voltage determination circuit connected to each battery compares the current battery voltage and controls the battery with the higher voltage among the multiple batteries. The switch circuit is turned on and connects the higher voltage battery among the plurality of batteries.

Referring to FIG. 2 , as an embodiment of the multi-voltage battery parallel circuit of the present invention, the multi-voltage battery parallel circuit preferably includes two battery circuit units, namely a first battery circuit unit and a second battery circuit unit. The structure of the battery switch circuit and the voltage determination circuit in the first battery circuit unit and the second battery circuit unit are completely the same.

The first battery circuit unit includes a first battery B1, a first battery switch circuit Q1, and a first voltage determination circuit. The first battery B1 is connected to the first battery switch circuit Q1, and the first battery B1 circuit is controlled by the first battery switch circuit Q1. Connected or not. The first voltage determination circuit includes a first voltage comparison circuit U1 and four voltage dividing resistors with equal resistances. The first voltage comparison circuit U1 includes a first non-inverting input terminal, a first inverting input terminal and a first comparison output terminal. The four voltage dividing resistors are respectively the first non-inverting voltage dividing resistor R1 , the first inverting phase voltage dividing resistor R2 , the first grounding voltage dividing resistor R5 and the first negative voltage dividing resistor R6 . Wherein, the first non-inverting voltage dividing resistor R1 is arranged between the positive pole of the first battery B1 and the first non-inverting input terminal, and the first inverting voltage dividing resistor R2 is arranged between the positive pole of the first battery B1 and the first inverting input terminal. Between, the first ground voltage dividing resistor R5 is arranged between the first non-inverting input terminal and the ground, and the first negative electrode voltage dividing resistor R6 is arranged between the first inverting input terminal and the negative electrode of the first battery B1.

Similarly, the second battery circuit unit includes a second battery B2, a second battery switch circuit Q2, and a second voltage determination circuit. The second battery B2 is connected to the second battery switch circuit Q2, and the second battery switch circuit Q2 controls the second battery. Whether the battery B2 circuit is connected or not. The second voltage determination circuit includes a second voltage comparison circuit U2 and four voltage dividing resistors with equal resistance. The second voltage comparison circuit U2 includes a second non-inverting input terminal, a second inverting input terminal and a second comparison output terminal. The four voltage dividing resistors are respectively the second non-inverting voltage dividing resistor R3, the second inverting voltage dividing resistor R4, the second grounding voltage dividing resistor R7 and the second negative voltage dividing resistor R8. Wherein, the second non-inverting voltage dividing resistor R3 is arranged between the positive pole of the second battery B2 and the second non-inverting input terminal, and the second inverting voltage dividing resistor R4 is arranged between the positive pole of the second battery B2 and the second inverting input terminal, The second ground voltage dividing resistor R7 is disposed between the second non-inverting input terminal and the ground, and the second negative voltage dividing resistor R8 is disposed between the second inverting input terminal and the negative pole of the second battery B2.

The gate G of the first battery switch circuit Q1 is connected to the first comparison output terminal, the drain D of the first battery switch circuit Q1 is connected to the negative pole of the first battery B1 , and the source S of the first battery switch circuit Q1 is grounded. When the first comparison output terminal outputs a high level, the first battery switch circuit Q1 is turned on, connecting the first battery B1 circuit; when the first comparison output terminal outputs a low level, the first battery switch circuit Q1 is turned off, and the first battery B1 circuit is connected. The battery B1 circuit is not connected.

Similarly, the gate G of the second battery switch circuit Q2 is connected to the second comparison output terminal, the drain D of the second battery switch circuit Q2 is connected to the negative pole of the second battery B2, and the source S of the second battery switch circuit Q2 is grounded. When the second comparison output terminal outputs a high level, the second battery switch circuit Q2 is turned on, connecting the second battery B2 circuit; when the second comparison output terminal outputs a low level, the second battery switch circuit Q2 is cut off, and the second battery B2 circuit is connected. The battery B2 circuit is disconnected.

It should be noted here that when the voltage of the first battery B1 is greater than the voltage of the second battery B2, the total voltage of the first inverting voltage dividing resistor R2 and the first negative voltage dividing resistor R6 is greater than that of the first non-inverting voltage dividing resistor R1 and The total voltage of the first ground voltage dividing resistor R5, meanwhile, the total voltage of the second non-inverting voltage dividing resistor R3 and the second ground voltage dividing resistor R7 is greater than the total voltage of the second inverting voltage dividing resistor R4 and the second negative pole voltage dividing resistor R8 Voltage. Wherein, the total voltage of the first non-inverting voltage dividing resistor R1 and the first grounding voltage dividing resistor R5 is equal to the total voltage of the second non-inverting voltage dividing resistor R3 and the second grounding voltage dividing resistor R7. It is thus obtained that the voltage of the first inverting voltage dividing resistor R2 is greater than the voltage of the first non-inverting voltage dividing resistor R1, the voltage of the second non-inverting voltage dividing resistor R3 is greater than the voltage of the second inverting voltage dividing resistor R4, and the first non-phase voltage dividing The voltage of the resistor R1 is equal to the voltage of the second non-inverting voltage dividing resistor R3.

Thus, the voltage of the first non-inverting input terminal is greater than the first inverting input voltage, and the first comparison output terminal outputs a high level, the first battery switch circuit Q1 is turned on, and the first battery B1 circuit is connected. At the same time, the voltage of the second non-inverting input terminal is lower than the voltage of the second inverting input terminal, and the second comparison output terminal outputs a low level, the second battery switch circuit Q2 is cut off, and the circuit of the second battery B2 is not connected. That is, the first battery B1 with a higher voltage among the first battery B1 and the second battery B2 becomes VCC to supply power for loads and the like. And when the first battery switch circuit Q1 is turned on and the second battery switch circuit Q2 is turned off, it can further prevent the first battery B1 from charging the second battery B2 in reverse.

Similarly, when the voltage of the first battery B1 is lower than the voltage of the second battery B2, the first voltage judging circuit outputs a low level to control the first battery switch circuit Q1 to cut off, and the circuit of the first battery B1 is not connected; at the same time, the second voltage judging circuit Output high level, control the second battery switch circuit Q2 to conduct, and connect the circuit of the second battery B2. That is, the second battery B2 with a higher voltage among the first battery B1 and the second battery B2 becomes the power supply VCC to supply power for loads and the like. And when the first battery switch circuit Q1 is turned off and the second battery switch circuit Q2 is turned on, it can further prevent the second battery B2 from charging the first battery B1 in reverse.

And according to the above, when the voltage of the first battery B1 is equal to the voltage of the second battery B2, both the first battery switch circuit Q1 and the second battery switch circuit Q2 are turned on, and the circuit of the first battery B1 is connected and the second battery is connected. The B2 circuit is connected, that is, the first battery B1 and the second battery B2 jointly serve as a power supply VCC to supply power to loads and the like.

Of course, the multi-voltage battery parallel circuit in FIG. 2 includes two battery circuit units, and finally the higher voltage of the first battery B1 and the second battery B2 becomes the power source VCC to supply power for loads and the like. It is not difficult to understand that according to the above description, when the multi-voltage battery parallel circuit uses more than 2 battery circuit units, the one with the higher voltage among the multiple batteries will eventually become the power supply VCC to supply power for the load and the like.

Continuing to refer to Fig. 2, the multi-voltage battery parallel circuit of the present invention can also realize the function of preventing battery reverse connection, that is, the positive pole of the first battery B1 of the first battery circuit unit is connected with the first non-phase voltage divider resistor R1, the first reverse phase divider The piezoresistor R2, the negative pole of the first battery B1 is connected to the first negative pole voltage dividing resistor R6, and the drain D of the first battery switch circuit Q1. If the positive pole of the first battery B1 is reversely connected to the negative pole of the first battery B1, according to the above analysis, the voltage of the first non-inverting input terminal is lower than the first inverting input voltage, and the first comparison output terminal outputs a low level, the first battery switch The circuit Q1 is cut off, and the circuit of the first battery B1 is not connected, so as to protect the first battery B1 against reverse rotation. Likewise, the second battery circuit unit can realize reverse protection for the second battery B2.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it still The technical solutions recorded in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. However, these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (8)

1. A multi-voltage battery parallel circuit, comprising a plurality of battery circuit units connected in parallel, characterized in that: each battery circuit unit includes a battery, a battery switch circuit, and a voltage determination circuit; the battery and the battery switch circuit connected in series, the battery switch circuit is used to control whether the corresponding battery circuit is connected; the voltage determination circuit is arranged between the battery and the battery switch circuit, and the voltage determination circuit is used for the battery The voltages are compared, and the battery switch circuit connected to the higher battery voltage is controlled to conduct. 2. The multi-voltage battery parallel circuit according to claim 1, characterized in that: the voltage judging circuit includes a voltage comparison circuit and 4 voltage dividing resistors with equal resistance; the voltage comparison circuit includes a non-inverting input terminal, an inverting phase input terminal and comparison output terminal, the four voltage divider resistors are the same phase voltage divider resistor, reverse phase voltage divider resistor, ground voltage divider resistor and negative pole voltage divider resistor; the same phase voltage divider resistor is set at the positive pole of the battery and the non-inverting input terminal, the anti-phase voltage dividing resistor is arranged between the positive pole of the battery and the inverting input terminal, and the grounding voltage dividing resistor is arranged between the non-inverting input terminal and ground, The negative voltage dividing resistor is arranged between the inverting input terminal and the negative pole of the battery. 3. The multi-voltage battery parallel circuit according to claim 2, characterized in that: the battery switch circuit adopts an NMOS switch tube, the gate G of the NMOS switch tube is connected to the comparison output terminal, and the NMOS switch tube The drain D of the NMOS switch tube is connected to the negative electrode of the battery, and the source S of the NMOS switch tube is grounded. 4. The multi-voltage battery parallel circuit according to any one of claims 1-3, wherein the battery, battery switch circuit and voltage determination circuit of each battery circuit unit are the same. 5. The multi-voltage battery parallel circuit according to any one of claims 1-3, wherein the battery switch circuit and the voltage determination circuit of each battery circuit unit are the same. 6. The multi-voltage battery parallel circuit according to claim 5, characterized in that: the multi-voltage battery parallel circuit comprises two battery circuit units, which are respectively a first battery circuit unit and a second battery circuit unit; When the voltage of the first battery B1 of a battery circuit unit is greater than the voltage of the second battery B2 of the second battery circuit unit, the first comparison output terminal of the first battery circuit unit outputs a high level, and the first battery circuit unit The first battery switch circuit Q1 of the unit is turned on; and the second comparison output terminal of the second battery circuit unit outputs a low level, and the second battery switch circuit Q2 of the second battery circuit unit is turned off. 7. The multi-voltage battery parallel circuit according to claim 5, characterized in that: the multi-voltage battery parallel circuit comprises two battery circuit units, which are respectively a first battery circuit unit and a second battery circuit unit; When the voltage of the first battery B1 of a battery circuit unit is lower than the voltage of the second battery B2 of the second battery circuit unit, the first comparison output terminal of the first battery circuit unit outputs a low level, and the first battery circuit unit The first battery switch circuit Q1 of the unit is turned off; and the second comparison output terminal of the second battery circuit unit outputs a high level, and the second battery switch circuit Q2 of the second battery circuit unit is turned on. 8. The multi-voltage battery parallel circuit according to claim 4, characterized in that: the multi-voltage battery parallel circuit comprises two battery circuit units, which are respectively a first battery circuit unit and a second battery circuit unit; When the voltage of the first battery B1 of a battery circuit unit is equal to the voltage of the second battery B2 of the second battery circuit unit, the first comparison output terminal of the first battery circuit unit outputs a high level, and the first battery circuit unit The first battery switch circuit Q1 of the unit is turned on; and the second comparison output terminal of the second battery circuit unit outputs a high level, and the second battery switch circuit Q2 of the second battery circuit unit is turned on.