CN110212259B - Power supply control circuit, forklift power supply circuit and forklift - Google Patents
Power supply control circuit, forklift power supply circuit and forklift Download PDFInfo
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- CN110212259B CN110212259B CN201910479791.3A CN201910479791A CN110212259B CN 110212259 B CN110212259 B CN 110212259B CN 201910479791 A CN201910479791 A CN 201910479791A CN 110212259 B CN110212259 B CN 110212259B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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- 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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
- H02J7/0032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits disconnection of loads if battery is not under charge, e.g. in vehicle if engine is not running
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- 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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The embodiment of the invention discloses a power supply control circuit, wherein a first relay controls the communication between a battery anode connecting end and a battery anode output end, and a battery cathode connecting end is connected with a battery cathode output end; the first self-reset switch and the second relay are used for controlling the communication between the positive electrode connecting end of the battery and the positive power supply connecting end of the DC/DC power supply module, and the negative electrode connecting end of the battery is connected with the negative power supply connecting end of the DC/DC power supply; the DC/DC power supply is used for supplying power to the battery management system; the second self-reset switch is used for controlling the communication between the DC/DC power supply and the level detection end of the battery management system; the battery management system is used for controlling the first relay and the second relay to be connected when the battery is powered on, and controlling the first relay and the second relay to be disconnected when the level detection end detects a level signal meeting a preset condition. The embodiment of the invention can completely cut off the power supply of the battery management system when the power supply to the load is cut off, thereby realizing the zero power cut-off.
Description
Technical Field
The embodiment of the invention relates to the technical field of power supplies, in particular to a power supply control circuit, a forklift power supply circuit and a forklift.
Background
In the face of the current domestic and even global increasingly strict exhaust emission standards and future energy crisis, various automobile manufacturers are researching and developing low-emission new energy technologies to adapt to the development trend, wherein pure electric automobiles are one of the fields researched and developed by various large automobile enterprises at present.
As a special vehicle device, a forklift has no Battery Management System (BMS) with a small number of lithium batteries. Present fork truck's power supply system all adopts the power supply that self-locking switch started the lithium cell, and the BMS chip can not turn off, even current BMS has the under-voltage dormancy and also can not accomplish zero-power consumption, leads to the battery to be exhausted easily.
Disclosure of Invention
The embodiment of the invention provides a power supply control circuit, a forklift power supply circuit and a forklift, which can completely cut off the power supply of a battery management system when the power supply to a load is cut off, and realize the zero power consumption cut-off.
In a first aspect, an embodiment of the present invention provides a power supply control circuit, which includes a first self-reset switch, a second self-reset switch, a battery positive connection end, a battery positive output end, a battery negative connection end, a battery negative output end, a DC/DC power module, a battery management system, a first relay, and a second relay;
the battery anode connecting end and the battery cathode connecting end are used for connecting a battery; the battery anode output end and the battery cathode output end are used for connecting a load;
the first relay is used for controlling the communication between the battery anode connecting end and the battery anode output end, and the battery cathode connecting end is connected with the battery cathode output end;
the first self-reset switch and the second relay are used for controlling the communication between the positive electrode connecting end of the battery and the positive power supply connecting end of the DC/DC power supply module, and the negative electrode connecting end of the battery is connected with the negative power supply connecting end of the DC/DC power supply;
the output end of the DC/DC power supply is connected with the power supply end of the battery management system;
the second self-reset switch is used for controlling the communication between the output end of the DC/DC power supply and the level detection end of the battery management system;
the battery management system is used for controlling the first relay and the second relay to be connected at the moment of electrifying, and controlling the first relay and the second relay to be disconnected when the level detection end detects a level signal meeting a preset condition.
In a second aspect, an embodiment of the present invention provides a power supply control circuit, which includes a first self-reset switch, a second self-reset switch, a battery positive connection terminal, a battery positive output terminal, a battery negative connection terminal, a battery negative output terminal, a DC/DC power module, a battery management system, a first relay, and a second relay;
the battery anode connecting end and the battery cathode connecting end are used for connecting a battery; the battery anode output end and the battery cathode output end are used for connecting a load;
the first relay is used for controlling the communication between the battery cathode connecting end and the battery cathode output end, and the battery anode connecting end is connected with the battery anode output end;
the first self-reset switch and the second relay are used for controlling the communication between the battery negative connecting end and the negative power supply connecting end of the DC/DC power supply module, and the battery positive connecting end is connected with the positive power supply connecting end of the DC/DC power supply;
the output end of the DC/DC power supply is connected with the power supply end of the battery management system;
the second self-reset switch is used for controlling the communication between the output end of the DC/DC power supply and the level detection end of the battery management system;
the battery management system is used for controlling the first relay and the second relay to be connected at the moment of electrifying, and controlling the first relay and the second relay to be disconnected when the level detection end detects a level signal meeting a preset condition.
In a third aspect, an embodiment of the present invention provides a power supply circuit for a forklift, where the power supply circuit for the forklift includes a battery and a power supply control circuit provided in any embodiment of the present invention;
the positive pole of fork truck power supply circuit's battery is connected power supply control circuit's anodal link of battery, the negative pole of fork truck power supply circuit's battery is connected power supply control circuit's battery negative pole link.
In a fourth aspect, an embodiment of the present invention provides a forklift including the power supply circuit of the forklift provided in any embodiment of the present invention.
The embodiment of the invention has the following beneficial effects:
in the technical scheme of the invention, a power supply control circuit is controlled by a self-reset switch, wherein a first self-reset switch controls a power supply link of a DC/DC power supply formed by a battery anode connecting end, a DC/DC power supply positive power supply connecting end, a negative power supply connecting end and a battery cathode connecting end; when the second self-reset switch is pressed, the output end of the DC/DC power supply and the level detection end of the battery management system are conducted, so that the battery management system turns off the first relay and the second relay, the battery is disconnected from the load, and the whole battery management system is powered off. The embodiment of the invention realizes power-on maintenance without a self-locking switch, completely cuts off the power supply of the battery management system when the power supply to the load is cut off, and realizes zero power consumption.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 is a schematic structural diagram of a power supply control circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another power supply control circuit provided in the embodiment of the present invention;
fig. 3 is a schematic structural diagram of another power supply control circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a power supply circuit of a forklift truck according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are for purposes of illustration and not limitation. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Furthermore, the terms first, second, third and the like in the description and in the claims, are used for descriptive purposes only to distinguish one element from another, and are not to be construed as indicating or implying relative importance or implying any order or order to the indicated elements. The terms are interchangeable where appropriate. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Similarly, the term "coupled", as used in the description and in the claims, should not be construed as limited to direct coupling. Thus, the expression "device a is connected to device B" should not be limited to devices or systems in which device a is directly connected to device B, meaning that there is a path between device a and device B, which may be a path including other devices or tools.
Fig. 1 is a schematic structural diagram of a power supply control circuit according to an embodiment of the present invention. The power supply control circuit provided by the embodiment of the invention comprises a first self-reset switch SB11, a second self-reset switch SB12, a battery positive electrode connecting end B +, a battery positive electrode output end OUT +, a battery negative electrode connecting end B-, a battery negative electrode output end OUT-, a DC/DC power supply module, a battery management system BMS, a first relay KA1 and a second relay KA 3.
Wherein the DC/DC power supply is a DC voltage converter; the first self-reset switch SB11 and the second self-reset switch SB12 are manual control devices, the first connecting end and the second connecting end of the switch are conducted after a user presses down the switch, and the first connecting end and the second connecting end are recovered to be disconnected after the user releases the switch; the first relay KA1 and the second relay KA3 are electric control devices, and in the embodiment of the invention, the first relays KA1 and KA3 are controlled by a battery management system BMS.
The battery anode connecting end B + and the battery cathode connecting end B-are used for connecting the battery; and the battery anode output end OUT + and the battery cathode output end OUT-are used for connecting a load. First relay KA1 is used for controlling battery positive pole link with the intercommunication between the battery positive pole output, battery negative pole link is connected the battery negative pole output. When the first relay KA1 is switched on through the arrangement, the positive electrode and the negative electrode of the battery are loaded on the load to supply power to the load, and when the first relay KA1 is switched off, the load is disconnected from the battery.
The first self-reset switch SB11 and the second relay KA3 are used for controlling the communication between the positive electrode connecting end B + of the battery and the positive power supply connecting end IN + of the DC/DC power supply module, and the negative electrode connecting end B-of the battery is connected with the negative power supply connecting end IN-of the DC/DC power supply. According to the arrangement, when the first self-reset switch SB11 or the second relay KA3 is switched on, the positive electrode and the negative electrode of the battery are respectively connected with the positive power supply connecting end and the negative power supply connecting end of the DC/DC power supply, the DC/DC is electrified, and when the first self-reset switch SB11 and the second relay KA3 are both switched off, the DC/DC power supply is powered off. Since the first self-reset switch SB11 is a manual control switch, the user can do this by pressing the first self-reset switch SB11 when power-up of the system is required.
The output of the DC/DC power supply, for example the 12V output, is connected to the supply terminal ON of the battery management system BMS. The user presses the first self reset switch SB11 and the battery management system BMS is powered on. The battery management system BMS is used for controlling the first relay KA1 and the second relay KA3 to be conducted at the moment of power-on, therefore, after a user presses the first self-reset switch SB11, the BMS is powered on to conduct a battery and a load, after the user releases the first self-reset switch SB11, the DC/DC power supply is kept powered on due to the second relay KA3, the second relay KA3 is kept to be conducted without other controls, and the self-locking function of the power supply control circuit is achieved.
And the second self-reset switch SB12 is used to control the connection between the output terminal of the DC/DC power supply and the level detection terminal X1 of the battery management system BMS, and the battery management system BMS is also used to control the first relay KA1 and the second relay KA3 to be turned off when the level detection terminal X1 detects a level signal satisfying a preset condition. The preset condition may be that the duration of the level signal is greater than a preset time threshold, the level signal appears several times intermittently, and the like. The above arrangement enables a user to control the level detection terminal X1 by operating the second self-reset switch so that the level signal received by the X1 meets the preset condition, and the relay disconnection is realized, preferably, the first relay KA1 is disconnected first to cut off the connection between the battery and the load, and then the second relay KA3 is disconnected, so that the DC/DC power supply and the battery management system BMS are powered down successively. As a preferred example, the first self-resetting switch SB11 and the second self-resetting switch SB12 are interlocked with each other, and more preferably, the first self-resetting switch SB11 and the second self-resetting switch SB12 are two switches among double pole self-resetting switches, and then the user can operate the same position to power on and off. In the forklift power supply system, the operation habit of a user can be kept. In addition, due to linkage of the two self-reset switches, when a user presses the self-reset switch and the self-reset switch is not released, the level detection terminal X1 detects a level signal through the second self-reset switch SB11, the first self-reset switch SB11 always keeps the battery management system BMS powered, the safety of the power supply control circuit is improved, and more abundant switch operation can be set.
Based on the same concept, the present invention also provides various alternative embodiments, such as another power supply control circuit shown in fig. 2. The battery management system comprises a first self-reset switch SB11, a second self-reset switch SB12, a battery positive electrode connecting end B +, a battery positive electrode output end OUT +, a battery negative electrode connecting end B-, a battery negative electrode output end OUT-, a DC/DC power module, a battery management system BMS, a first relay KA1 and a second relay KA 3;
the battery anode connecting end B + and the battery cathode connecting end B-are used for connecting the battery; the battery anode output end OUT + and the battery cathode output end OUT-are used for connecting a load;
the first relay KA1 is used for controlling the communication between the battery cathode connecting end B-and the battery cathode output end OUT-, and the battery anode connecting end B + is connected with the battery anode output end OUT +;
the first self-reset switch SB11 and the second relay KA3 are used for controlling the communication between the battery negative electrode connecting end B-and the negative power supply connecting end IN-of the DC/DC power supply module, and the battery positive electrode connecting end B + is connected with the positive power supply connecting end IN + of the DC/DC power supply;
the output end of the DC/DC power supply, for example, the 12V output end, is connected with the power supply end ON of the battery management system BMS;
the second self-reset switch SB12 is used to control the connection between the output terminal of the DC/DC power supply and the level detection terminal X1 of the battery management system BMS;
the battery management system BMS is configured to control the first relay KA1 and the second relay KA3 to be turned on at a power-on moment, and to control the first relay KA1 and the second relay KA2 to be turned off when the level detection terminal X1 detects a level signal satisfying a preset condition.
The principle of the power supply control circuit is as the foregoing embodiments, and is not described herein.
According to the technical scheme, the power supply control circuit adopts the self-reset switch for control, wherein the first self-reset switch controls a power supply link of the DC/DC power supply formed by the positive electrode connecting end of the battery, the positive power supply connecting end of the DC/DC power supply, the negative power supply connecting end and the negative electrode connecting end of the battery, when the first self-reset switch is pressed, the power supply link of the DC/DC power supply is conducted, the DC/DC power supply is electrified to work to supply power for the battery management system, the battery management system is electrified to conduct the first relay and the second relay, thereby leading the anode connecting end of the battery to be conducted with the anode output end of the battery, leading the anode and the cathode of the battery to be loaded on a load, the power supply link of the DC/DC power supply is kept to be conducted through a second relay, so that the function of a self-locking switch is realized through a first self-resetting switch; when the second self-reset switch is pressed, the output end of the DC/DC power supply and the level detection end of the battery management system are conducted, so that the battery management system turns off the first relay and the second relay, the battery is disconnected from the load, and the whole battery management system is powered off. The embodiment of the invention realizes power-on maintenance without a self-locking switch, completely cuts off the power supply of the battery management system when the power supply to the load is cut off, and realizes zero power consumption.
Alternatively, in order to implement the above functions, programs corresponding to the above-described BMS functions may be provided in the BMS, and corresponding BMS ports are provided to connect the first relay KA1 and the second relay KA 1. Specifically, referring to a schematic configuration diagram of another power supply control circuit shown in fig. 3, the battery management system BMS includes a positive power supply control terminal and a negative power supply control terminal (such as power supply control + and power supply control- "in fig. 3), the positive power supply control terminal is connected to the first connection terminal of the second relay KA3, and the negative power supply control terminal is connected to the second connection terminal of the second relay K3; the battery management system further comprises an output control positive terminal and an output control negative terminal (such as output control + and output control-in fig. 3, the connection mode is not shown), the output control + is connected with the first connection terminal of the first relay KA1, and the output control-is connected with the second connection terminal of the first relay KA 1.
In fig. 3, a first self-reset switch SB11 and a second self-reset switch SB12 form a double-pole self-reset switch SB1, when SB1 is pressed, a DC/DC power supply is powered ON, the DC power supply outputs 12V at the moment of power supply to supply power to a BMS normal fire +, an ON gear supplies power, and after the BMS is powered ON and self-checked, a power supply control output closes KA3 and a total positive output KA 1. At this time, the power supply of the SB1 is released, and the battery system is powered up and can be used normally. By pressing SB1 for a long time (or other predetermined operation), for example, 3 seconds, the level 12V + is inputted to the level detection terminal X-25 of the BMS, and once the level signal for 3 seconds is detected, the BMS controls KA3 to turn off when the SB1 switch is released. And the battery system is powered off to complete the battery shutdown process. Because whole BMS system and external current are by DC/DC power supply, when KA3 disconnection, all loads have thoroughly been disconnected for the battery is zero load forever, consequently has not avoided not using the battery management system BMS from the battery zero voltage risk that power consumption brought.
On the basis of the above embodiments, as shown in fig. 3, the power supply control circuit may further include a shunt FL-2, wherein the shunt FL-2 is connected between the battery negative connection terminal B-and the battery negative output terminal OUT-;
the battery management system BMS is further configured to monitor the shunt FL-2 and to switch off said first relay KA1 upon detecting that the current of the shunt FL-2 is smaller than a preset current threshold. Further, the second relay KA3 may be opened. The above arrangement is such that when the power supply is forgotten by a person, the battery management system BMS drives KA3 to turn off the entire battery system completely when detecting that the battery discharge current is too small through the shunt FL-2.
Specifically, the battery management system BMS further comprises a shunt connection positive terminal FL + and a shunt connection negative terminal FL-; the shunt connection positive terminal FL + and the shunt connection negative terminal FL-are respectively connected with two ends of the shunt FL-2.
An embodiment of the present invention further provides a power supply circuit for a forklift, as shown in fig. 4, the power supply circuit for a forklift includes a battery BAT and a power supply control circuit provided in any embodiment of the present invention;
the positive pole of the battery BAT of the forklift power supply circuit is connected with the positive pole connecting end of the battery of the power supply control circuit, and the negative pole of the battery BAT of the forklift power supply circuit is connected with the negative pole connecting end of the battery of the power supply control circuit.
The power supply control circuit for the forklift has the advantages of being simple in structure, convenient to use, and capable of achieving the effect of improving the power supply efficiency.
Illustratively, the battery BAT may be a lithium battery.
The embodiment of the invention also provides the forklift, and the forklift comprises the power supply circuit of the forklift provided by the embodiment of the invention. The forklift also has the power supply control circuit provided by the embodiment, and therefore, the forklift has corresponding beneficial effects.
In summary, in any embodiment of the present invention, the power supply control circuit is controlled by a self-reset switch, wherein the first self-reset switch controls a power supply link of a DC/DC power supply formed by a positive electrode connection end of a battery, a positive power connection end of the DC/DC power supply, a negative power connection end of the DC/DC power supply, and a negative electrode connection end of the battery, and when the first self-reset switch is pressed, the power supply link of the DC/DC power supply is turned on, the DC/DC power supply is powered on to operate to supply power to the battery management system, the battery management system is powered on to turn on a first relay and a second relay, so that the positive electrode connection end of the battery is turned on with the positive electrode output end of the battery, the positive electrode and the negative electrode of the battery can be loaded on a load, and the power supply link of the DC/DC; when the second self-reset switch is pressed, the output end of the DC/DC power supply and the level detection end of the battery management system are conducted, so that the battery management system turns off the first relay and the second relay, the battery is disconnected from the load, and the whole battery management system is powered off. The embodiment of the invention realizes power-on maintenance without a self-locking switch, completely cuts off the power supply of the battery management system when the power supply to the load is cut off, and realizes zero power consumption. The invention has the advantages of low cost, convenient wiring, few components and low failure rate. The energy storage device can be used for various EV vehicles, special vehicles and energy storage projects.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. A power supply control circuit is characterized by comprising a first self-reset switch, a second self-reset switch, a battery anode connecting end, a battery anode output end, a battery cathode connecting end, a battery cathode output end, a DC/DC power supply module, a battery management system, a first relay and a second relay;
the battery anode connecting end and the battery cathode connecting end are used for connecting a battery; the battery anode output end and the battery cathode output end are used for connecting a load;
the first relay is used for controlling the communication between the battery anode connecting end and the battery anode output end, and the battery cathode connecting end is connected with the battery cathode output end;
the first self-reset switch and the second relay are used for controlling the communication between the positive electrode connecting end of the battery and the positive power supply connecting end of the DC/DC power supply module, and the negative electrode connecting end of the battery is connected with the negative power supply connecting end of the DC/DC power supply;
the output end of the DC/DC power supply is connected with the power supply end of the battery management system;
the second self-reset switch is used for controlling the communication between the output end of the DC/DC power supply and the level detection end of the battery management system;
the battery management system is used for controlling the first relay and the second relay to be switched on at the moment of electrifying, and controlling the first relay and the second relay to be switched off when the level detection end detects a level signal meeting a preset condition; the preset condition is that the duration of the level signal exceeds a preset time threshold.
2. The power supply control circuit of claim 1, wherein the first self-reset switch and the second self-reset switch are interlocked with each other.
3. The power supply control circuit of claim 1, wherein the first self-resetting switch and the second self-resetting switch are two of a double pole self-resetting switch.
4. The power supply control circuit of claim 1 further comprising a shunt connected between the battery negative connection terminal and the battery negative output terminal;
the battery management system is further used for monitoring the current divider, and disconnecting the first relay and the second relay when the current of the current divider is detected to be smaller than a preset current threshold value.
5. The power supply control circuit according to any one of claims 1 to 4, wherein the battery management system turns off the first relay and then turns off the second relay when the level detection terminal detects a level signal meeting a preset condition.
6. The power supply control circuit according to claim 4, wherein the battery management system comprises a power supply control positive terminal and a power supply control negative terminal, the power supply control positive terminal is connected with the first connection terminal of the second relay, and the power supply control negative terminal is connected with the second connection terminal of the second relay;
the battery management system further comprises an output control positive terminal and an output control negative terminal, the output control positive terminal is connected with the first connecting end of the first relay, and the output control negative terminal is connected with the second connecting end of the first relay;
the battery management system further comprises a shunt connection positive terminal and a shunt connection negative terminal; the shunt connection positive end and the shunt connection negative end are respectively connected with two ends of the shunt.
7. A power supply control circuit is characterized by comprising a first self-reset switch, a second self-reset switch, a battery anode connecting end, a battery anode output end, a battery cathode connecting end, a battery cathode output end, a DC/DC power supply module, a battery management system, a first relay and a second relay;
the battery anode connecting end and the battery cathode connecting end are used for connecting a battery; the battery anode output end and the battery cathode output end are used for connecting a load;
the first relay is used for controlling the communication between the battery cathode connecting end and the battery cathode output end, and the battery anode connecting end is connected with the battery anode output end;
the first self-reset switch and the second relay are used for controlling the communication between the battery negative connecting end and the negative power supply connecting end of the DC/DC power supply module, and the battery positive connecting end is connected with the positive power supply connecting end of the DC/DC power supply;
the output end of the DC/DC power supply is connected with the power supply end of the battery management system;
the second self-reset switch is used for controlling the communication between the output end of the DC/DC power supply and the level detection end of the battery management system;
the battery management system is used for controlling the first relay and the second relay to be switched on at the moment of electrifying, and controlling the first relay and the second relay to be switched off when the level detection end detects a level signal meeting a preset condition; the preset condition is that the duration of the level signal exceeds a preset time threshold.
8. A forklift power supply circuit, characterized in that it comprises a battery and a power supply control circuit according to any one of claims 1 to 7;
the positive pole of fork truck power supply circuit's battery is connected power supply control circuit's anodal link of battery, the negative pole of fork truck power supply circuit's battery is connected power supply control circuit's battery negative pole link.
9. A forklift truck characterized in that it comprises a forklift truck power supply circuit according to claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910479791.3A CN110212259B (en) | 2019-06-04 | 2019-06-04 | Power supply control circuit, forklift power supply circuit and forklift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910479791.3A CN110212259B (en) | 2019-06-04 | 2019-06-04 | Power supply control circuit, forklift power supply circuit and forklift |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110212259A CN110212259A (en) | 2019-09-06 |
| CN110212259B true CN110212259B (en) | 2021-03-02 |
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| CN201910479791.3A Active CN110212259B (en) | 2019-06-04 | 2019-06-04 | Power supply control circuit, forklift power supply circuit and forklift |
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| CN112421706A (en) * | 2020-09-30 | 2021-02-26 | 惠州市蓝微新源技术有限公司 | Self-adaptive forklift high-low pressure system control system and method |
| CN112265471B (en) * | 2020-10-27 | 2022-03-22 | 格力博(江苏)股份有限公司 | Battery pack on-off control system |
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| CN110212259A (en) | 2019-09-06 |
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