CN107069928B - Main switch control circuit for multi-battery pack mower - Google Patents
Main switch control circuit for multi-battery pack mower Download PDFInfo
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- CN107069928B CN107069928B CN201710190443.5A CN201710190443A CN107069928B CN 107069928 B CN107069928 B CN 107069928B CN 201710190443 A CN201710190443 A CN 201710190443A CN 107069928 B CN107069928 B CN 107069928B
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- triode
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- 238000001514 detection method Methods 0.000 claims description 7
- 102100031699 Choline transporter-like protein 1 Human genes 0.000 description 4
- 101000940912 Homo sapiens Choline transporter-like protein 1 Proteins 0.000 description 4
- 102100035954 Choline transporter-like protein 2 Human genes 0.000 description 3
- 101000948115 Homo sapiens Choline transporter-like protein 2 Proteins 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000013138 pruning Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/36—Arrangements using end-cell switching
Abstract
The present invention relates to the field of control circuits, in particular to a main switch control circuit for a multi-battery pack mower. The invention comprises a main switch, a driving control circuit the same number of battery packs as battery packs control the switch module and the precharge circuit; one end of the pre-charging circuit is connected with the anodes of the battery packs in a one-to-one correspondence manner, the other end of the precharge circuit is connected with the main switch; each battery pack control switch module is connected in parallel with one precharge circuit, the control end of each battery pack control switch module is connected with one path of control output of the drive control circuit; the cathodes of the battery packs are connected with the main switch and the power supply cathode of the drive control circuit; the main switch is connected with the power supply anode of the drive control circuit.
Description
Technical Field
The invention relates to the field of control circuits, in particular to a main switch control circuit for a multi-battery pack mower.
Background
In the field of electric tools, lithium batteries are increasingly used by virtue of their excellent performance in many respects. The electric mower is used as an afforestation machine and is widely applied to pruning and finishing work of green lands such as urban street gardens, street green belts, home courtyards and the like.
Limited to the cruising ability of single-cell pack mowers, dual-cell mowers are becoming increasingly popular. The main switch of the current mainstream dual battery pack mower is controlled to manually switch the battery packs. In the mowing process, when the electric quantity of one group of battery packs is discharged, a user is required to stop mowing work, and the mowing work can be continued after the mowing work is manually switched to the other group of battery packs. This approach has some drawbacks in the user experience. The automatic battery pack switching mode can be automatically switched to another battery pack after the electric quantity of one battery pack is discharged, and no additional operation is needed for a user. However, the main switch control circuit of the automatic switching mode is still blank.
Disclosure of Invention
The invention aims to solve the technical problem of providing a main switch control circuit for a multi-battery-pack mower aiming at the defects in the prior art.
The technical scheme adopted by the invention for achieving the purpose is as follows: a main switch control circuit for a multi-battery pack mower comprises a main switch, a drive control circuit, battery pack control switch modules and a precharge circuit, wherein the battery pack control switch modules are the same in number as battery packs;
one end of the pre-charging circuit is connected with the anodes of the battery packs in a one-to-one correspondence manner, and the other end of the pre-charging circuit is connected with the main switch;
each battery pack control switch module is connected with one pre-charging circuit in parallel, and the control end of each battery pack control switch module is connected with one path of control signal of the driving control circuit;
the cathodes of the battery packs are connected with the main switch and the power supply cathode of the drive control circuit;
the main switch is connected with the power supply anode of the drive control circuit.
The precharge circuit includes a clamp diode and a current limiting resistor in series.
The clamping diode is formed by connecting a plurality of clamping diodes in parallel, and the current limiting resistor is formed by connecting a plurality of resistors in parallel.
The precharge circuit comprises a plurality of parallel structures, and each parallel structure is a clamping diode and a current limiting resistor which are connected in series.
The main switch is any one of a single-pole single-throw switch, a single-pole double-throw switch and a double-pole double-throw switch.
The battery pack control switch module is any one of a relay, a MOSFET, a triode and an electronic switch.
The battery pack control switch module is of a parallel structure of a plurality of relays, MOSFETs, triodes or electronic switches.
The driving control circuit comprises an MCU, a voltage detection circuit and a plurality of driving circuits;
the number of the driving circuits is the same as that of the battery packs, and the driving circuits are used for outputting control signals according to the output signals of the MCU, and the control signals are connected with the control end of the battery pack control switch module;
the voltage detection circuit comprises two voltage dividing resistors and a MOSFET transistor, one ends of the two voltage dividing resistors are respectively connected with a source electrode and a drain electrode of the MOSFET transistor, and the other ends of the two voltage dividing resistors are respectively connected with a positive power supply port and a negative power supply port; and the grid electrode of the MOSFET transistor is connected with one output end of the MCU, and the connection and disconnection of the two divider resistors are controlled according to the output of the MCU.
When the battery pack control switch module is a relay, the control circuit comprises a triode, a first triode driving resistor, a second triode driving resistor and a freewheeling diode;
the base electrode of the triode is connected with one end of the first triode driving resistor and one end of the second triode driving resistor, the emitter electrode of the triode is connected with the other end of the second triode driving resistor and the negative electrode of the power supply of the driving control circuit, and the collector electrode of the triode is connected with one end of the coil of the relay;
the other end of the first triode driving resistor is connected with the MCU;
and the positive electrode of the follow current diode is connected with one end of the coil of the relay, and the negative electrode of the follow current diode is connected with the other end of the coil of the relay.
When the battery pack control switch module is a MOSFET, the control circuit comprises a first driving resistor, a second driving resistor, a triode, a first triode driving resistor and a second triode driving resistor;
one end of the first driving resistor is connected with the anode of the battery pack and the source electrode of the MOSFET, and the other end of the first driving resistor is connected with the second driving resistor and the grid electrode of the MOSFET;
the other end of the second driving resistor is connected with the collector electrode of the triode;
the emitter of the triode is connected with the power supply negative electrode of the drive control circuit and one end of the first triode drive resistor, and the base is connected with one end of the second triode drive resistor and the other end of the first triode drive resistor;
and the other end of the second triode driving resistor is connected with the MCU.
The invention has the following advantages and beneficial effects:
1. the main switch control circuit is safer and more reliable;
2. the battery pack mode is automatically switched, no additional operation is needed, and the use is more convenient;
3. not only is the switching of double battery packs, but also the switching of n groups of battery packs can be realized.
Drawings
FIG. 1 is a block diagram of the overall structure of the present invention;
FIG. 2 is an overall schematic of an embodiment of the present invention;
fig. 3 is a block diagram of a first driving circuit when the first battery pack control switch module is a relay;
fig. 4 is a diagram showing a second driving circuit configuration when the second pack control switch module is a P-MOSFET.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, a main switch control circuit for a multi-pack mower includes a main switch, a driving control circuit, a pack control switch module of the same number as the packs, and a precharge circuit; one end of the pre-charging circuit is connected with the anodes of the battery packs in a one-to-one correspondence manner, and the other end of the pre-charging circuit is connected with the main switch; each battery pack control switch module is connected with a precharge circuit in parallel, and the control end of each battery pack control switch module is connected with one path of control output of the drive control circuit; the cathodes of the battery packs are connected with the main switch and the power supply cathode of the drive control circuit; the main switch is connected with the power supply anode of the drive control circuit.
Taking a dual cell as an example, one embodiment of the present invention is shown in fig. 2. The control objects of the present embodiment are two: a first Battery Pack (Battery Pack 1) and a second Battery Pack (Battery Pack 2). The embodiment comprises: the device comprises a first precharge circuit (a clamp diode D1 and a current limiting resistor R1 which are connected in series), a second precharge circuit (a clamp diode D2 and a current limiting resistor R2 which are connected in series), a first battery pack control switch module (S1), a second battery pack control switch module (S2), a main switch (S3) and a drive control circuit (Controller). The positive electrode of the first battery pack is connected with one end of a parallel structure of the first pre-charging circuit and the first battery pack control switch module; the positive electrode of the second battery pack is connected with one end of a parallel structure of the second pre-charging circuit and the second battery pack control switch module. The other end of the parallel structure of the first pre-charging circuit and the first battery pack control switch module is connected with the other end of the parallel structure of the second pre-charging circuit and the second battery pack control switch module, and is connected with the No. 1 end of the main switch. The negative electrode of the first battery pack and the negative electrode of the second battery pack are connected with the No. 3 end of the main switch and the negative electrode of the drive control circuit. And the ends 2 and 4 of the main switch are connected with the positive electrode of the drive control circuit. The first battery pack control switch module is connected with one path of control output of the drive control circuit; the second battery pack control switch module is connected with the other path of control output of the drive control circuit.
In the first precharge circuit, the clamp diode D1 represents a plurality of clamp diodes connected in parallel, and the current limiting resistor R1 represents a plurality of resistors connected in parallel; alternatively, the first precharge circuit includes a plurality of parallel structures, each of which is a clamp diode and a current limiting resistor connected in series.
Similarly, in the second precharge circuit, the clamp diode D2 represents a plurality of clamp diodes connected in parallel, and the current limiting resistor R2 represents a plurality of resistors connected in parallel; alternatively, the first precharge circuit includes a plurality of parallel structures, each of which is a clamp diode and a current limiting resistor connected in series.
The main switch S3 may be a single pole single throw, single pole double throw, double pole double throw switch.
The first battery pack control switch module and the second battery pack control switch module can be in the form of relays, MOSFETs, triodes, or any form of electronic switch. The first battery pack control switch module may be a parallel structure of several switches. The second battery pack control switch module may be a parallel structure of several switches.
The drive control circuit at least comprises an input power positive electrode P+, a power negative electrode P-, an MCU, a voltage detection circuit and a plurality of drive circuits. The number of the driving circuits is the same as that of the battery packs, and in this embodiment, the driving circuits are a first driving circuit Driver1 and a second driving circuit Driver2, and a first control signal CTL1 and a second control signal CTL2 are output. The voltage detection circuit comprises divider resistors R3 and R4 and a MOSFET transistor Q1, wherein the MOSFET transistor Q1 is connected with one output end of the MCU, and when the output end outputs a high level, the MOSFET transistor Q1 is conducted and the divider resistors R3 and R4 are connected; when the output terminal outputs a low level, the MOSFET transistor Q1 is turned off, and the voltage dividing resistors R3 and R4 are turned off, so that leakage current when the drive control circuit stops operating is reduced.
It should be noted that, when the first battery pack control switch module and the second battery pack control switch module are different switch structures, the driving circuit also has different structures.
As shown in fig. 3, when the first battery pack control switch module S1 is a relay, the corresponding first control circuit at least includes a transistor Q2, transistor driving resistors R5 and R6, and a freewheeling diode D4. When the output signal O1 of the MCU is at a high level, Q2 is conducted, so that the relay S1 is attracted, and B1+ is connected with B+; when the output signal O1 of the MCU is at a low level, Q2 is cut off, so that the relay is released, and B1+ and B+ are disconnected. Similarly, when the second battery pack control switch module S2 is a relay, the corresponding second control circuit also has the same structure.
As shown in fig. 4, when the second battery pack control switch module S2 is a P-MOSFET, the corresponding second driving control circuit at least includes driving resistors R7 and R8, a transistor Q3, and transistor driving resistors R9 and R10. When the output signal O2 of the MCU is at a high level, the triode Q3 is conducted, the R8 is connected with P-, the grid voltage of the MOSFET is the voltage divided by the B < 2+ > through the R7 and the R8, and the P-MOSFET is conducted to enable the B < 2+ > to be connected with the B < + >; when the output signal O2 of the MCU is at a low level, the triode Q3 is cut off, R8 is disconnected with P-, the grid voltage of the P-MOSFET is B2+ voltage, and the P-MOSFET is cut off, so that the B2+ and the B+ are disconnected. Similarly, when the first pack control switch module S1 is a P-MOSFET, the corresponding first control circuit also has the same structure.
Based on the embodiments, the working principle of the invention is explained: before the main switch S3 is not pressed, the first battery pack control switch module S1 and the second battery pack control switch module S2 are in an off state, and the anodes of the two battery packs are disconnected with the driving control circuit. After the main switch S3 is pressed down, the first battery pack passes through the first pre-charging circuit, and the second battery pack charges the drive control circuit through the second pre-charging circuit, so that the drive control circuit starts to work. The MCU in the drive control circuit controls the first drive circuit to work through a signal O1, and outputs a first control signal CTL1 to open a first battery pack control switch module S1, so that the anode B1+ of the first battery pack is connected with the anode P+ of the drive control circuit, and the first battery pack is used for discharging at the moment; the MCU of the drive control circuit monitors voltage in real time through the voltage detection circuit, when the electric quantity of the first battery pack is insufficient, the MCU in the drive control circuit controls the first drive circuit to stop working through the signal O1, the first control signal CTL1 is not output, and the first battery pack control switch module S1 is disconnected. Meanwhile, the MCU in the drive control circuit controls the second drive circuit to work through the signal O2, and outputs a second control signal CTL2 to close a second battery pack control switch S2, so that the anode B1+ of the second battery pack is disconnected from the anode P+ of the drive control circuit, and meanwhile, the anode B2+ of the second battery pack is connected with the anode P+ of the drive control circuit, and the second battery pack is used for discharging. After the main switch S3 is released, the positive electrode P+ of the drive control circuit is connected with the negative electrode P-of the drive control circuit through the S3, the electric quantity stored in the drive control circuit is quickly discharged, the drive control circuit stops working, the control signals CTL1 and CTL2 stop outputting, and the battery pack control switch modules S1 and S2 are in an off state.
Claims (10)
1. A main switch control circuit for a multi-battery pack mower, which is characterized by comprising a main switch, a driving control circuit, battery pack control switch modules with the same number as battery packs and a pre-charging circuit;
one end of the pre-charging circuit is connected with the anodes of the battery packs in a one-to-one correspondence manner, and the other end of the pre-charging circuit is connected with the main switch; each battery pack control switch module is connected with one pre-charging circuit in parallel, and the control end of each battery pack control switch module is connected with one path of control signal of the driving control circuit;
the cathodes of the battery packs are connected with the main switch and the power supply cathode of the drive control circuit;
the main switch is connected with the positive electrode of the power supply of the drive control circuit;
the other end of the parallel structure of the pre-charging circuit of each battery pack and the battery pack control switch module is connected with the first end of the main switch, the negative electrode of each battery pack is connected with the second end of the main switch and the negative electrode of the drive control circuit, and the third end of the main switch is connected with the positive electrode of the drive control circuit;
after the main switch is pressed down, the battery pack charges the drive control circuit through the charging circuit, so that the drive control circuit starts to work; after the main switch is released, the positive electrode of the drive control circuit is connected with the negative electrode of the drive control circuit through the main switch, the electric quantity stored in the drive control circuit is discharged, and the drive control circuit stops working.
2. The main switch control circuit for a multi-pack mower of claim 1 wherein said precharge circuit comprises a clamp diode and a current limiting resistor in series.
3. The main switch control circuit for a multi-pack mower of claim 2 wherein said clamping diode is comprised of a plurality of clamping diodes in parallel and said current limiting resistor is comprised of a plurality of resistors in parallel.
4. The main switch control circuit for a multi-pack mower of claim 2 wherein said precharge circuit comprises a plurality of parallel structures, each parallel structure being a clamp diode and a current limiting resistor in series.
5. The main switch control circuit for a multi-battery pack mower of claim 1 wherein the main switch is any one of a single pole single throw switch, a single pole double throw switch, a double pole double throw switch.
6. The main switch control circuit for a multi-pack mower of claim 1 wherein the pack control switch module is any one of a relay, MOSFET, triode, electronic switch.
7. The main switch control circuit for a multi-pack mower of claim 6 wherein the pack control switch module is a parallel configuration of relays, MOSFETs, transistors or electronic switches.
8. The main switch control circuit for a multi-battery pack mower of claim 1, wherein the drive control circuit comprises an MCU, a voltage detection circuit and a plurality of drive circuits;
the number of the driving circuits is the same as that of the battery packs, and the driving circuits are used for outputting control signals according to the output signals of the MCU, and the control signals are connected with the control end of the battery pack control switch module;
the voltage detection circuit comprises two voltage dividing resistors and a MOSFET transistor, one ends of the two voltage dividing resistors are respectively connected with a source electrode and a drain electrode of the MOSFET transistor, and the other ends of the two voltage dividing resistors are respectively connected with a positive power supply port and a negative power supply port; and the grid electrode of the MOSFET transistor is connected with one output end of the MCU, and the connection and disconnection of the two divider resistors are controlled according to the output of the MCU.
9. The main switch control circuit for a multi-pack mower of claim 8 wherein when the pack control switch module is a relay, the control circuit comprises a transistor, a first transistor drive resistor, a second transistor drive resistor and a freewheeling diode;
the base electrode of the triode is connected with one end of the first triode driving resistor and one end of the second triode driving resistor, the emitter electrode of the triode is connected with the other end of the second triode driving resistor and the negative electrode of the power supply of the driving control circuit, and the collector electrode of the triode is connected with one end of the coil of the relay;
the other end of the first triode driving resistor is connected with the MCU;
and the positive electrode of the follow current diode is connected with one end of the coil of the relay, and the negative electrode of the follow current diode is connected with the other end of the coil of the relay.
10. The main switch control circuit for a multi-pack mower of claim 8 wherein when the pack control switch module is a MOSFET, the control circuit comprises a first drive resistor, a second drive resistor, a triode, a first triode drive resistor, and a second triode drive resistor;
one end of the first driving resistor is connected with the anode of the battery pack and the source electrode of the MOSFET, and the other end of the first driving resistor is connected with the second driving resistor and the grid electrode of the MOSFET;
the other end of the second driving resistor is connected with the collector electrode of the triode;
the emitter of the triode is connected with the power supply negative electrode of the drive control circuit and one end of the first triode drive resistor, and the base is connected with one end of the second triode drive resistor and the other end of the first triode drive resistor;
and the other end of the second triode driving resistor is connected with the MCU.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710190443.5A CN107069928B (en) | 2017-03-28 | 2017-03-28 | Main switch control circuit for multi-battery pack mower |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710190443.5A CN107069928B (en) | 2017-03-28 | 2017-03-28 | Main switch control circuit for multi-battery pack mower |
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| CN107069928A CN107069928A (en) | 2017-08-18 |
| CN107069928B true CN107069928B (en) | 2024-04-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109995096B (en) * | 2017-12-29 | 2022-07-12 | 苏州宝时得电动工具有限公司 | Multi-pack parallel mutual charging control circuit, control method and electric tool |
| CN110445200B (en) * | 2018-05-02 | 2023-11-07 | 苏州宝时得电动工具有限公司 | Multi-pack parallel control circuit, control method and electric tool |
| CN111864717A (en) * | 2020-08-14 | 2020-10-30 | 精进电动科技股份有限公司 | Electromagnetic clutch circuit and automobile |
| CN114977396A (en) * | 2022-05-31 | 2022-08-30 | 浙江特康电子科技有限公司 | Charger and charging method for battery pack |
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| CN107069928A (en) | 2017-08-18 |
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