Internal combustion engine power station starting battery pack parallel pre-charging circuit

Abstract

The utility model discloses an internal combustion engine power station starting battery pack parallel connection pre-charging circuit which comprises a pre-charging control module, the positive electrode input end of the pre-charging control module is connected with a first wiring terminal through a starting switch, the negative electrode input end of the pre-charging control module is connected with a second wiring terminal, and the first wiring terminal is further connected with the first voltage detection end of the pre-charging control module. The third wiring terminal is connected with a second voltage detection end of the pre-charging control module, the first wiring terminal and the third wiring terminal are connected through a first switch and a current-limiting resistor which are connected in series, a controlled end of the first switch is connected with a starting switch, and the first wiring terminal and the third wiring terminal are further connected through a second switch. The controlled end of the second switch is connected with the control end of the pre-charging control module. Voltage between the starting battery pack and the parallel battery pack which are externally connected is compared in real time through the pre-charging control module, parallel connection of the parallel battery pack and the starting battery pack is controlled, and safety and reliability of emergency power supply of the internal combustion engine power station are improved.

Description

Technical Field

[0001] The utility model belongs to the field of electric energy, and in particular relates to a parallel pre-charging circuit for a starting battery pack of an internal combustion engine power station. Background Art

[0002] Long-term standby of an internal combustion engine power station can easily lead to a loss of power in the starting battery pack and make it impossible to start. In this case, if a fully charged backup battery pack is directly connected, the instantaneous short-circuit current in parallel is large, which is more likely to damage the connection joint and cause safety hazards. Therefore, during the charging process of the starting battery pack of an internal combustion engine power station, in order to improve the safety of charging, it is necessary to connect a pre-charging circuit to protect the battery pack charging, but the current pre-charging circuit is complex and inefficient, and cannot be directly applied to internal combustion engine power stations. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the above-mentioned prior art, solve the problem of instantaneous large current generated when the backup battery pack is directly connected to the starting battery pack, improve charging safety, and provide a parallel pre-charging circuit for the starting battery pack of an internal combustion engine power station.

[0004] In order to achieve the above purpose, the utility model adopts the following scheme:

[0005] A parallel pre-charging circuit for a starting battery pack of an internal combustion engine power station comprises a first wiring terminal, a second wiring terminal, a third wiring terminal and a pre-charging control module, wherein the positive input terminal of the pre-charging control module is connected to the first wiring terminal through a starting switch, the negative input terminal of the pre-charging control module is connected to the second wiring terminal, the first wiring terminal is also connected to the first voltage detection terminal of the pre-charging control module, the third wiring terminal is connected to the second voltage detection terminal of the pre-charging control module, the first wiring terminal and the third wiring terminal are connected through a first switch, the first switch is connected in series with a current limiting resistor, the controlled end of the first switch is also connected to the first wiring terminal through the starting switch, the first wiring terminal and the third wiring terminal are also connected through a second switch, the controlled end of the second switch is connected to the control end of the pre-charging control module, and the pre-charging control module is used to output a level control signal through the control end after receiving signals detected by the first voltage detection end and the second voltage detection end.

[0006] The utility model compares the voltage between the externally connected starting battery group and the parallel battery group in real time through a pre-charge control module, and when the voltage difference is too small, controls the parallel battery group to charge the starting battery group, and after the voltage difference is reduced to a set value, controls the parallel battery group to be connected in parallel with the starting battery group, thereby reducing the instantaneous current when the two are connected in parallel, and improving safety and reliability.

[0007] Preferably, the pre-charge control module includes a first operational amplifier, a positive terminal of the first operational amplifier is connected to the positive input terminal of the pre-charge control module, a non-phase input terminal of the first operational amplifier is connected to the moving contact of a sliding rheostat, a first end of the sliding rheostat is connected to the second voltage detection terminal of the pre-charge control module, a second end of the sliding rheostat is connected to the first end of a second resistor, an inverting input terminal of the first operational amplifier is connected to the first end of a third resistor, a second end of the third resistor is connected to the first voltage detection terminal of the pre-charge control module, a first end of the third resistor is also connected to the first end of a fourth resistor, second ends of the second resistor and the fourth resistor are both connected to the negative input terminal of the pre-charge control module, an output terminal of the first operational amplifier is connected to the control terminal of the pre-charge control module, and a voltmeter is connected between the non-phase input terminal and the second end of the sliding rheostat.

[0008] Preferably, the first operational amplifier adopts an LM358 chip.

[0009] Preferably, the first switch adopts a first contactor, the first terminal and the third terminal are connected through the contacts of the first contactor, the contacts of the first contactor are connected in series with a current limiting resistor, the controlled end of the first contactor is a first coil, the first end of the first coil is connected to the first terminal through a starting switch, the second end of the first coil is connected to the second terminal, and a first freewheeling diode is connected in parallel at both ends of the first coil.

[0010] Preferably, the second switch adopts a second contactor, the first terminal and the third terminal are also connected through the contacts of the second contactor, the controlled end of the second contactor is a second coil, the first end of the second coil is connected to the control end of the pre-charging control module, the second end of the second coil is connected to the second terminal, and a second freewheeling diode is connected in parallel at both ends of the second coil.

[0011] Preferably, the first wiring terminal, the second wiring terminal and the third wiring terminal are all wiring posts or electrical connectors.

[0012] The precharging circuit of the utility model can improve the safety and reliability of emergency power supply of the internal combustion engine power station, avoid the failure of the internal combustion engine power station to start due to power loss of the starting battery pack, and has a simple structure and is easy to connect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described below in conjunction with the accompanying drawings:

[0014] Figure 1 It is a circuit schematic diagram of the utility model. DETAILED DESCRIPTION

[0015] like Figure 1As shown, the utility model provides a parallel pre-charging circuit of a starting battery pack for an internal combustion engine power station, comprising a first wiring terminal 1XT, a second wiring terminal 2XT, a third wiring terminal 3XT and a pre-charging control module J1, wherein the positive input terminal P1 of the pre-charging control module J1 is connected to the first wiring terminal 1XT through a starting switch SB, the negative input terminal P2 of the pre-charging control module J1 is connected to the second wiring terminal 2XT, the first wiring terminal 1XT is also connected to the first voltage detection terminal P3 of the pre-charging control module J1, and the third wiring terminal 3XT is connected to the second voltage detection terminal P3 of the pre-charging control module J1. The first wiring terminal 1XT and the third wiring terminal 3XT are connected through a first switch, the first switch is connected in series with the current limiting resistor R1, the controlled end of the first switch is also connected to the first wiring terminal 1XT through the starting switch SB, the first wiring terminal 1XT and the third wiring terminal 3XT are also connected through a second switch, the controlled end of the second switch is connected to the control end P5 of the pre-charge control module J1, and the pre-charge control module J1 is used for outputting a level control signal through the control end P5 after receiving the signals detected by the first voltage detection terminal P3 and the second voltage detection terminal P4. The pre-charge control module J1 includes a first operational amplifier, a positive terminal Vcc of the first operational amplifier is connected to the positive input terminal P1 of the pre-charge control module J1, a non-inverting input terminal V+ of the first operational amplifier is connected to the moving contact of the sliding rheostat R5, a first end of the sliding rheostat R5 is connected to the second voltage detection terminal P4 of the pre-charge control module J1, a second end of the sliding rheostat R5 is connected to the first end of the second resistor R2, an inverting input terminal V- of the first operational amplifier is connected to the first end of the third resistor R3, a second end of the third resistor R3 is connected to the first voltage detection terminal P3 of the pre-charge control module J1, a first end of the third resistor R3 is also connected to the first end of the fourth resistor R4, the second ends of the second resistor R2 and the fourth resistor R4 are both connected to the negative input terminal P2 of the pre-charge control module J1, an output terminal Vout of the first operational amplifier is connected to the control terminal P5 of the pre-charge control module J1, and a voltmeter PV is connected between the non-inverting input terminal V+ and the second end of the sliding rheostat R5. The value of the voltage difference ΔU is adjusted by the sliding rheostat R5 and displayed by the voltmeter PV. When the sliding rheostat R5 slides toward its first end, the input voltage at the non-phase input terminal V+ of the first operational amplifier increases, and the voltage difference ΔU increases; when the sliding rheostat R5 slides toward its second end, the input voltage at the non-phase input terminal V+ of the first operational amplifier decreases, and the voltage difference ΔU decreases.

[0016] The utility model detects the voltage of the externally connected starting battery group and the parallel battery group through the pre-charge control module J1, and compares the voltage difference between the two, and then changes the connection mode between the starting battery group and the parallel battery group by controlling the switch of the contactor, thereby reducing the voltage difference between the starting battery group and the parallel battery group, and realizing parallel connection of the two when the voltage difference is small, thereby reducing the instantaneous current generated when the starting battery group and the parallel battery group are connected in parallel, and improving safety and reliability.

[0017] In this embodiment, the first operational amplifier uses an LM358 chip. The first switch uses a first contactor, the first terminal 1XT and the third terminal 3XT are connected through the contact KM1-1 of the first contactor, the contact KM1-1 of the first contactor is connected in series with the current limiting resistor R1, the controlled end of the first contactor is the first coil KM1, the first end of the first coil KM1 is connected to the first terminal 1XT through the start switch SB, the second end of the first coil KM1 is connected to the second terminal 2XT, and the first freewheeling diode D1 is connected in parallel at both ends of the first coil KM1. The second switch uses a second contactor, the first terminal 1XT and the third terminal 3XT are also connected through the contact KM2-1 of the second contactor, the controlled end of the second contactor is the second coil KM2, the first end of the second coil KM2 is connected to the control end of the pre-charge control module J1, the second end of the second coil KM2 is connected to the second terminal 2XT, and the second freewheeling diode D2 is connected in parallel at both ends of the second coil KM2.

[0018] In this embodiment, the first wiring terminal 1XT, the second wiring terminal 2XT and the third wiring terminal 3XT are all connected by terminals or electrical connectors.

[0019] In this embodiment, the specific working steps are as follows: after the starting battery pack B1 runs out of power, the parallel battery pack B2 is connected to the circuit, the first terminal 1XT is connected to the positive terminal of the parallel battery pack B2, the second terminal 2XT is connected to the negative terminal of the starting battery pack B1 and the negative terminal of the parallel battery pack B2, the third terminal 3XT is connected to the positive terminal of the starting battery pack B1, and the resistance value of the sliding rheostat R5 is adjusted to set the value of the voltage difference ΔU. Press the start button SB, the start button SB is closed, the first coil KM1 is energized, the contact KM1-1 of the first contactor is closed, and the current of the parallel battery pack B2 is transmitted to the starting battery pack B1 through the current limiting resistor R1 to charge the starting battery pack B1.

[0020] At the same time, the first operational amplifier LM358 chip of the pre-charge control module J1 compares the voltage U1 of the starting battery pack B1 and the voltage U2 of the parallel battery pack B2 in real time. When U2-U1>ΔU, the output terminal Vout of the first operational amplifier outputs a low level, the control terminal P5 of the pre-charge control module J1 outputs a low level, the second coil KM2 of the second contactor is not energized, and the parallel battery pack B2 continues to charge the starting battery pack B1. When U2-U1≤ΔU, the output terminal Vout of the first operational amplifier outputs a high level, the control terminal P5 of the pre-charge control module J1 outputs a high level, the second coil KM2 is energized, the contact KM2-1 of the second contactor is closed, and the parallel battery pack B2 is directly connected in parallel with the starting battery pack B1.

[0021] After the internal combustion engine power station is started, press the start button SB again, the start button SB is disconnected, the control end P5 of the pre-charge control module J1 is invalid, the output is low level, the first coil KM1 and the second coil KM2 are both de-energized, and the contacts KM1-1 and KM2-1 are both disconnected, then the pre-charge is completed.

[0022] The precharging circuit of the utility model can improve the safety and reliability of emergency power supply of the internal combustion engine power station, avoid the failure of the internal combustion engine power station to start due to power loss of the starting battery pack, and has a simple structure and is easy to connect.

[0023] The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined by the claims.

Claims

1. A parallel pre-charging circuit for starting batteries of an internal combustion engine power station, characterized in that: It includes a first wiring terminal, a second wiring terminal, a third wiring terminal and a pre-charge control module, the positive input terminal of the pre-charge control module is connected to the first wiring terminal through a start switch, the negative input terminal of the pre-charge control module is connected to the second wiring terminal, the first wiring terminal is also connected to the first voltage detection terminal of the pre-charge control module, the third wiring terminal is connected to the second voltage detection terminal of the pre-charge control module, the first wiring terminal and the third wiring terminal are connected through a first switch, the first switch is connected in series with a current limiting resistor, the controlled end of the first switch is also connected to the first wiring terminal through the start switch, the first wiring terminal and the third wiring terminal are also connected through a second switch, the controlled end of the second switch is connected to the control end of the pre-charge control module, and the pre-charge control module is used to output a level control signal through the control end after receiving the signals detected by the first voltage detection end and the second voltage detection end.

2. A parallel pre-charging circuit for starting batteries of an internal combustion engine power station according to claim 1, characterized in that: The pre-charge control module includes a first operational amplifier, a positive terminal of the first operational amplifier is connected to the positive input terminal of the pre-charge control module, a non-phase input terminal of the first operational amplifier is connected to the moving contact of a sliding rheostat, a first end of the sliding rheostat is connected to the second voltage detection terminal of the pre-charge control module, a second end of the sliding rheostat is connected to the first end of a second resistor, an inverting input terminal of the first operational amplifier is connected to the first end of a third resistor, a second end of the third resistor is connected to the first voltage detection terminal of the pre-charge control module, a first end of the third resistor is also connected to the first end of a fourth resistor, second ends of the second resistor and the fourth resistor are both connected to the negative input terminal of the pre-charge control module, an output terminal of the first operational amplifier is connected to the control terminal of the pre-charge control module, and a voltmeter is connected between the non-phase input terminal and the second end of the sliding rheostat.

3. A parallel pre-charging circuit for starting batteries of an internal combustion engine power station according to claim 1, characterized in that: The first switch adopts a first contactor, the first terminal and the third terminal are connected through the contact of the first contactor, the contact of the first contactor is connected in series with a current limiting resistor, the controlled end of the first contactor is a first coil, the first end of the first coil is connected to the first terminal through a starting switch, the second end of the first coil is connected to the second terminal, and a first freewheeling diode is connected in parallel at both ends of the first coil.

4. A parallel pre-charging circuit for starting batteries of an internal combustion engine power station according to claim 1, characterized in that: The second switch adopts a second contactor, and the first terminal and the third terminal are also connected through the contacts of the second contactor. The controlled end of the second contactor is a second coil, and the first end of the second coil is connected to the control end of the pre-charge control module, and the second end of the second coil is connected to the second terminal. A second freewheeling diode is connected in parallel at both ends of the second coil.

5. A parallel pre-charging circuit for starting batteries of an internal combustion engine power station according to claim 1, characterized in that: The first connecting terminal, the second connecting terminal and the third connecting terminal are all connected by connecting posts or electrical connectors.

6. A parallel pre-charging circuit for starting batteries of an internal combustion engine power station according to claim 2, characterized in that: The first operational amplifier adopts LM358 chip.

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