CN112259414A - Low-side driving self-holding circuit of direct current contactor coil - Google Patents
Low-side driving self-holding circuit of direct current contactor coil Download PDFInfo
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- CN112259414A CN112259414A CN202010987719.4A CN202010987719A CN112259414A CN 112259414 A CN112259414 A CN 112259414A CN 202010987719 A CN202010987719 A CN 202010987719A CN 112259414 A CN112259414 A CN 112259414A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/001—Functional circuits, e.g. logic, sequencing, interlocking circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
- H01H47/32—Energising current supplied by semiconductor device
Abstract
The invention discloses a low-side driving self-holding circuit of a direct-current contactor coil, which comprises switching tubes Q21-Q26, a capacitor C21, resistors R21-R32 and a resistor RS; the collector C of the switching tube Q26 is connected with the input end VN of the low-side driving circuit; the input end VN of the low-side driving circuit is connected with the output end VLN of the contactor coil; the base B of the switching tube Q23 is connected with the 1 st pin of the resistor R32; the emitter E of the switching tube Q23 is connected to the ground GND. The low-side driving self-holding circuit of the direct-current contactor coil disclosed by the invention has the advantages that the hardware circuit design is scientific, the additional port resource of the BMS main control chip is not occupied, the contactor coil can be ensured not to be powered off when the BMS main control chip is abnormally reset, the self-holding function of the contactor coil control circuit is realized, meanwhile, the special integrated driving chip is not adopted, the multi-path driving expansion can be supported, and the practical value is very high.
Description
Technical Field
The invention relates to the technical field of battery management, in particular to a low-side driving self-holding circuit of a direct current contactor coil.
Background
A Battery Management System (BMS), which is a Battery protection device and is also a bridge between a Battery and a load terminal, provides protection functions such as overcharge, overdischarge, and over-temperature for the Battery according to the actual usage state of the Battery monitored on line, and ensures that the Battery is safely used. The battery management system BMS is widely used in various fields such as electric vehicles, communication base stations, and robots.
Taking an electric automobile as an example, a direct current contactor is generally adopted in a vehicle-mounted power battery system as a switching device of a high-voltage loop of the battery system, and the direct current contactor is a key electrical component in the vehicle-mounted power battery system and is controlled to be switched on and off by a BMS or a vehicle-mounted electronic control system. In actual use, if a coil of the direct current contactor suddenly loses power supply, a high-voltage loop of the power battery system is disconnected, so that a vehicle suddenly loses power, the normal use of the vehicle is seriously influenced, and great risk is brought to driving safety. One of the reasons for the above problems is: the BMS main control chip is abnormally reset, so that the control signal of the coil control loop of the direct current contactor is lost, and the coil of the direct current contactor is powered off to stop working.
In view of the above problems, in some prior art schemes, a latch and a dedicated integrated driving chip are used to achieve self-holding of a coil control loop of a dc contactor, but the latch needs to occupy too many control ports of a BMS main control chip, and the current dedicated integrated driving chip is high in price;
in addition, the expansion of the special integrated driving chip is not flexible, the special integrated driving chip generally supports multi-path driving, and if a small number of contactors are driven or only 1-path contactor needs to be driven in the expansion process, at least one special integrated driving chip is needed, so that chip resources are wasted, the space of a circuit board is occupied, and the material cost is higher.
Disclosure of Invention
The invention aims to provide a low-side driving self-holding circuit of a direct current contactor coil, aiming at the technical defects in the prior art.
Therefore, the invention provides a low-side driving self-holding circuit of a direct current contactor coil, which comprises switching tubes Q21-Q26, a capacitor C21, resistors R21-R32 and a resistor RS, wherein:
the 1 st pin of the resistor R21 is respectively connected with the 1 st pin of the resistor R26 and the control signal terminal SL2 of the BMS main control chip;
the 2 nd pin of the resistor R21 is respectively connected with the 1 st pin of the resistor R22 and the grid G of the switching tube Q21;
the source S of the switch tube Q21 is respectively connected with the No. 2 pin of the resistor R22 and the ground end GND;
the drain D of the switching tube Q21 is connected with the 2 nd pin of the resistor R23;
the 1 st pin of the resistor R23 is respectively connected with the base B of the switch tube Q22 and the 2 nd pin of the resistor R24;
an emitter E of the switching tube Q22 is connected with a No. 2 pin of the resistor R25;
a collector C of the switching tube Q22 is respectively connected with an emitter E of the switching tube Q24, a collector C of the switching tube Q25, a 1 st pin of the capacitor C21, a 1 st pin of the resistor R28 and a 1 st pin of the resistor R29;
the 1 st pin of the resistor R24 is respectively connected with a direct current power supply VCC, the 1 st pin of the resistor R25, the 1 st pin of the resistor R27 and the 1 st pin of the resistor R30;
the base B of the switching tube Q24 is connected with the 2 nd pin of the resistor R26;
the collector C of the switching tube Q24 is connected with the ground end GND;
the 2 nd pin of the resistor R27 is connected with the emitter E of the switching tube Q25;
a base B of the switching tube Q25, which is respectively connected with the 1 st pin of the resistor R31 and the 2 nd pin of the resistor R30;
the 2 nd pin of the capacitor C21 and the 2 nd pin of the resistor R28 are respectively connected with a ground terminal GND;
the 2 nd pin of the resistor R29 is connected with the base B of the switch tube Q26;
an emitter E of the switching tube Q26 is connected with a 1 st pin of the resistor RS and a 2 nd pin of the resistor R32;
the 2 nd pin of the resistor RS is connected with a ground end GND;
the collector C of the switching tube Q26 is connected with the input end VN of the low-side driving circuit;
the input end VN of the low-side driving circuit is connected with the output end VLN of the contactor coil;
the 2 nd pin of the resistor R31 is connected with the collector C of the switch tube Q23;
the base B of the switching tube Q23 is connected with the 1 st pin of the resistor R32;
the emitter E of the switching tube Q23 is connected to the ground GND.
Preferably, the switching tube Q21 is an N-channel enhancement mode field effect transistor MOSFET;
the switching tubes Q22, Q23, Q24 and Q26 are PNP type triodes;
the switching tube Q25 is an NPN transistor.
Preferably, the operation mode of the low-side driving self-holding circuit is as follows:
firstly, in the initial state of the low-side driving circuit, a control signal end SL2 of a BMS main control chip is input in a low level or high resistance state, a switch tube Q21, a switch tube Q22, a switch tube Q23, a switch tube Q24, a switch tube Q25 and a switch tube Q26 are all cut off, and a contactor coil does not work;
when the control signal end SL2 of the BMS main control chip is changed into high level, the switching tube Q24 is cut off, the switching tube Q21 is conducted with the switching tube Q22, the switching tube Q26 is conducted, a direct-current power supply VCC is connected, and the contactor coil normally works;
the bias voltage V3 of the base bias loop of the switching tube Q23 is changed from 0V to high potential, so that the switching tube Q23 and the switching tube Q25 are conducted;
a direct-current power supply VCC enables a bias voltage V2 to keep a high potential state through a resistor R27, a switch tube Q25, a resistor R28 and a capacitor C21, and the switch tube Q26 is continuously conducted to play a role in driving self-holding;
when the control signal terminal SL2 of the BMS main control chip is changed from a high level to a low level, the switching tube Q21 and the switching tube Q22 are changed from on to off, the dc power supply VCC keeps the bias voltage V2 unchanged at a high potential through the resistor R27, the switching tube Q25, the resistor R28 and the capacitor C21, so that the switching tube Q24 is changed from off to on, the switching tube Q26 is changed from on to off, the connection between the contactor coil and the dc power supply VCC is disconnected, and the contactor coil stops working;
after the switching tube Q26 is cut off, the switching tube Q23 and the switching tube Q25 are also turned off from conduction, the connection between the base bias loop of the switching tube Q26 and the direct current power supply VCC is cut off, the bias voltage V2 is maintained in a low potential state, and the switching tube Q26 is locked in a cut-off state;
fourthly, in the power-on state of the contactor coil, when the BMS main control chip is reset, the control signal end SL2 is changed from high-level output to high-resistance state input, the switching tube Q21 and the switching tube Q22 are changed from conduction to cut-off, the switching tube Q24 keeps the cut-off state, the capacitor C21 keeps the high potential of the bias voltage V2 unchanged, the switching tube Q26 is kept conducted, the bias voltage V3 is kept unchanged, the switching tube Q23 and the switching tube Q25 are kept conducted, and the direct-current power supply VCC is continuously connected; because the direct current power supply VCC keeps the bias voltage V2 at a high potential through the resistor R27, the switching tube Q25, the resistor R28 and the capacitor C21, the switching tube Q26, the switching tube Q23 and the switching tube Q25 are always kept in a conducting state, and the contactor coil is also always kept in a working state, so that a self-holding function of driving the contactor coil is realized until the control signal SL2 becomes a low level.
Compared with the prior art, the low-side driving self-holding circuit of the direct-current contactor coil is scientific in hardware circuit design, does not occupy extra port resources of a BMS (battery management system) main control chip, can ensure that the contactor coil cannot be powered off when the BMS main control chip is abnormally reset, realizes the self-holding function of the contactor coil control loop, and has great production practice significance.
In addition, the low-side driving self-holding circuit of the direct current contactor coil provided by the invention can support multi-path driving expansion without adopting a special integrated driving chip, electronic components are of a general application type and are easy to select, a circuit board occupies a small space, the design cost is very low, and the low-side driving self-holding circuit is a technical scheme which is easy to select devices and is low in cost, so that the technical scheme has very high practical value and market popularization value.
The technical scheme provided by the invention can also be applied to electronic and electrical systems of which the driving circuits need self-holding functions in other fields.
Drawings
Fig. 1 is a circuit diagram of a high-side driving self-holding circuit of a dc contactor coil according to the present invention;
FIG. 2 is a circuit diagram of a low side driving self-holding circuit of a DC contactor coil according to the present invention;
fig. 3 is a schematic structural diagram of the dc contactor coil, which is connected to the high side driving self-holding circuit and the bottom side driving self-holding circuit simultaneously.
Detailed Description
In order to make the technical means for realizing the invention easier to understand, the following detailed description of the present application is made in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the present application are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The specific meaning of the above terms in the present application can be understood by those skilled in the art as the case may be.
Referring to fig. 1, the invention provides a high-side driving self-holding circuit of a direct current contactor coil, which comprises switching tubes Q1-Q5, resistors R1-R12, a capacitor C1 and a diode D1;
the 1 st pin of the resistor R1 is respectively connected with the 1 st pin of the resistor R11 and the control signal terminal SL1 of the BMS main control chip;
the 2 nd pin of the resistor R1 is respectively connected with the 1 st pin of the resistor R2 and the grid G of the switching tube Q1;
the source S of the switch tube Q1 is respectively connected with the No. 2 pin of the resistor R2 and the ground end GND;
the drain D of the switching tube Q1 is connected with the 2 nd pin of the resistor R3;
the 1 st pin of the resistor R3 is respectively connected with the base B of the switch tube Q2 and the 2 nd pin of the resistor R12;
an emitter E of the switching tube Q2 is connected with a No. 2 pin of the resistor R4;
a collector C of the switching tube Q2, which is connected to the emitter E of the switching tube Q4, the 1 st pin of the resistor R5, the 1 st pin of the resistor R6, the 1 st pin of the capacitor C1 and the cathode of the diode D1;
the 1 st pin of the resistor R4 is respectively connected with the 1 st tube of the resistor R8, the 1 st pin of the resistor R12 and a direct-current power supply VCC;
the base B of the switching tube Q4 is connected with the 2 nd pin of the resistor R11;
the collector C of the switching tube Q4 is connected with the ground end GND;
and the anode of the diode D1, the 2 nd pin of the connecting resistance R9;
the 1 st pin of the resistor R9 is connected with the output end VP of the high-side driving circuit;
the 2 nd pin of the resistor R5 is respectively connected with the 2 nd pin of the capacitor C1, the 2 nd pin of the resistor R10 and the ground terminal GND;
the 2 nd pin of the resistor R6 is connected with the base B of the switch tube Q3;
an emitter E of the switching tube Q3 is connected with a 1 st pin of the resistor R10;
the collector C of the switch tube Q3 is connected with the 2 nd pin of the resistor R7;
the 1 st pin of the resistor R7 is respectively connected with the gate G of the switch tube Q5 and the 2 nd pin of the resistor R8;
the drain D of the switching tube Q5 is connected with a direct-current power supply VCC;
the source electrode S of the switching tube Q5 is connected with the output end VP of the high-side driving circuit;
the output end VP of the high-side driving circuit is connected with the VLP of the power supply input end of the contactor coil;
in the invention, in particular, for a high-side driving circuit, the switching tube Q1 is an N-channel enhancement type field effect tube MOSFET;
the switching tube Q5 is a P-channel enhanced field effect transistor MOSFET;
the switching tubes Q2 and Q4 are PNP type triodes;
the switching tube Q3 is an NPN transistor.
In the present invention, it should be noted that the SL1 is a control signal terminal of the BMS main control chip, and the general purpose input/output port GPIO of the BMS main control chip is used to provide the control signal SL1, and the port should have three signal states:
firstly, outputting high level, and switching on a power supply of a contactor coil;
secondly, inputting low level, and disconnecting the power supply of the coil of the contactor;
thirdly, inputting in a high resistance state, and switching on a power supply of a contactor coil;
it should be noted that, when the BMS main control chip is reset, the control signal terminal SL1 should be in a high impedance state.
In the invention, in a specific implementation, the direct current power supply VCC can be a 12V or 24V direct current power supply and is used for supplying power to a coil of the contactor;
in order to more clearly understand the technical solution of the present invention, the operation principle of the high-side driving circuit of the present invention is explained below.
In the present invention, the operation mode of the high-side driving circuit is as follows:
in the initial state of the high-side driving circuit, a control signal end SL1 of the BMS main control chip is input in a low level or high resistance state, a switching tube Q1, a switching tube Q2, a switching tube Q3, a switching tube Q4 and a switching tube Q5 are all cut off, and a contactor coil does not work;
when the control signal end SL1 of the BMS main control chip is changed into high level, the switch tube Q4 is cut off, the switch tube Q1 and the switch tube Q2 are conducted, the switch tube Q3 and the switch tube Q5 are conducted, the voltage of the output end VP of the high-side driving circuit is equal to the direct current power supply VCC, namely the voltage of the power supply input end VLP of the contactor coil is equal to the direct current power supply VCC, and the contactor coil can normally work;
the output end VP of the high-side driving circuit maintains the bias voltage V1 to be in a high potential state through the resistor R9, the diode D1, the resistor R5 and the capacitor C1, and the switching tube Q3 is continuously conducted to play a driving self-holding role;
in a specific implementation, when the control signal terminal SL1 of the BMS main control chip is at a high level, a specific embodiment may be as follows:
when the control signal end SL1 of the BMS main control chip is at a high level of 5V, after the switching tube Q1 is turned on, the base of the switching tube Q2 is connected with the ground end GND through the resistor R3, so that the switching tube Q2 is saturated and turned on, and the dc power VCC is connected to the base bias loop of the switching tube Q3;
after a direct current power supply VCC is divided by a resistor R4 and a resistor R5, a bias voltage V1 of a base bias loop of a switch tube Q3 is changed from 0V to a high potential;
since the high potential of the bias voltage V1 is less than the high level 5V of the control signal terminal SL, there is no current in the base of the switch Q4 and the resistor R11, and the switch Q4 is turned off;
the bias voltage V1 is high, so the switch tube Q3 is turned on;
after the direct current power supply VCC is divided by the resistor R8, the resistor R7, the switch tube Q3 and the resistor R10, the voltage of the gate G of the switch tube Q5 is lower than the voltage of the drain D thereof, so the switch tube Q5 is also turned on, the voltage of the output terminal VP of the high-side driving circuit is equal to the direct current power supply VCC, that is, the voltage of the power supply input terminal VLP of the contactor coil is equal to the direct current power supply VCC, and the contactor coil can normally work;
the output terminal VP of the high-side driving circuit can maintain the bias voltage V1 at a high potential through the resistor R9, the diode D1, the resistor R5 and the capacitor C1, so that the switching tube Q3 and the switching tube Q5 are kept in a conducting state.
When the control signal terminal SL1 of the BMS master control chip is changed from a high level to a low level, the switching tube Q1 and the switching tube Q2 are changed from on to off, the output terminal VP of the high side driving circuit keeps the bias voltage V1 at a high potential through the resistor R9, the diode D1, the resistor R5 and the capacitor C1, the switching tube Q4 is turned on, the switching tube Q3 and the switching tube Q5 are changed from on to off, at this time, the voltage of the output terminal VP of the high side driving circuit is changed to 0V, the voltage of the power supply input terminal VLP of the contactor coil is changed to 0V, and the contactor coil stops working;
in particular implementation, when the control signal terminal SL1 of the BMS main control chip is changed from the high level to the low level, a specific embodiment may be as follows:
when the control signal end SL1 of the BMS main control chip is changed from a high level of 5V to a low level of 0V, the switching tube Q1 is changed from on to off, the resistor R12 pulls the base voltage of the switching tube Q2 up to the dc power VCC, which is equal to the emitter voltage of the switching tube Q2, so that the switching tube Q2 is also changed from on to off, and the dc power VCC is turned off;
the capacitor C1 keeps the high potential of the bias voltage V1 unchanged, keeps the switching tube Q3 and the switching tube Q5 turned on, makes the voltage of the output end VP of the high-side driving circuit equal to the dc power VCC, can make the contactor coil energized to enter a working state, and keeps the high potential of the bias voltage V1 unchanged through the resistor R9, the diode Q1, the resistor R5 and the capacitor C1, makes the base of the switching tube Q4 and the resistor R11 have current, the switching tube Q4 is turned off to be on, pulls down the bias voltage V1 from the high potential to the low potential, and makes the switching tube Q3 turned off from the on;
the resistor R8 pulls the grid G of the switch tube Q5 to a direct current power supply VCC which is equal to the voltage of the drain D of the switch tube Q5, so that the switch tube Q5 is also switched from on to off, the voltage of the output end VP of the high-side driving circuit is changed from the direct current power supply VCC to 0V, and the coil of the contactor stops working;
after the voltage of the output end VP of the high-side driving circuit is changed from the dc power supply VCC to 0V, the bias voltage V1 is pulled down from a low potential to 0V by the resistor R5, the switch tube Q3 and the switch tube Q5 are locked in an off state, the contactor coil is kept in a stopped state, and the switch tube Q4 is also changed from on to off.
Fourthly, in the power-on state of the contactor coil, at the moment, if the BMS main control chip is reset, the control signal end SL1 is changed from high-level output to high-resistance state input, the switching tube Q1 and the switching tube Q2 are changed from conduction to cut-off, the switching tube Q4 keeps the cut-off state, the capacitor C1 keeps the high potential of the bias voltage V1 unchanged, the switching tube Q3 and the switching tube Q5 are kept conducted, and the voltage of the output end VP of the high-side driving circuit is equal to the direct-current power VCC;
due to the existence of the voltage of the output end VP of the high-side driving circuit, the bias voltage V1 is kept unchanged at a high potential through the resistor R9, the diode D1, the resistor R5 and the capacitor C1, so that the switch tube Q3 and the switch tube Q5 are kept in a conducting state all the time, and the contactor coil is kept in a working state all the time, thereby realizing the self-holding function of the contactor coil driving until the control signal end SL1 is changed into a low level.
In concrete implementation, when the BMS host control chip is reset, the specific embodiment may be as follows:
when the control signal end SL1 of the BMS master control chip is at a high level of 5V, the BMS master control chip is reset, the control signal end SL1 of the BMS master control chip is changed from a high level output of 5V to a high resistance state input, the switching tube Q1 and the switching tube Q2 are changed from on to off, and the switching tube Q4 is kept in an off state;
the capacitor C1 maintains the high potential of the bias voltage V1 unchanged, keeps the switch tube Q3 and the switch tube Q5 conducted, makes the voltage of the output end VP of the high-side driving circuit equal to the dc power VCC, and continues to maintain the high potential of the bias voltage V1 unchanged through the resistor R9, the diode Q1, the resistor R5 and the capacitor C1, so that the switch tube Q3 and the switch tube Q5 are always kept in a conducting state, and the contactor coil is always kept in a working state, thereby realizing the self-holding function of the contactor coil drive until the control signal end SL1 becomes a low level.
Referring to fig. 2, the invention provides a low-side driving self-holding circuit of a coil of a dc contactor, comprising switching tubes Q21-Q26, a capacitor C21, resistors R21-R32 and a resistor RS, wherein:
the 1 st pin of the resistor R21 is respectively connected with the 1 st pin of the resistor R26 and the control signal terminal SL2 of the BMS main control chip;
the 2 nd pin of the resistor R21 is respectively connected with the 1 st pin of the resistor R22 and the grid G of the switching tube Q21;
the source S of the switch tube Q21 is respectively connected with the No. 2 pin of the resistor R22 and the ground end GND;
the drain D of the switching tube Q21 is connected with the 2 nd pin of the resistor R23;
the 1 st pin of the resistor R23 is respectively connected with the base B of the switch tube Q22 and the 2 nd pin of the resistor R24;
an emitter E of the switching tube Q22 is connected with a No. 2 pin of the resistor R25;
a collector C of the switching tube Q22 is respectively connected with an emitter E of the switching tube Q24, a collector C of the switching tube Q25, a 1 st pin of the capacitor C21, a 1 st pin of the resistor R28 and a 1 st pin of the resistor R29;
the 1 st pin of the resistor R24 is respectively connected with a direct current power supply VCC, the 1 st pin of the resistor R25, the 1 st pin of the resistor R27 and the 1 st pin of the resistor R30;
the base B of the switching tube Q24 is connected with the 2 nd pin of the resistor R26;
the collector C of the switching tube Q24 is connected with the ground end GND;
the 2 nd pin of the resistor R27 is connected with the emitter E of the switching tube Q25;
a base B of the switching tube Q25, which is respectively connected with the 1 st pin of the resistor R31 and the 2 nd pin of the resistor R30;
the 2 nd pin of the capacitor C21 and the 2 nd pin of the resistor R28 are respectively connected with a ground terminal GND;
the 2 nd pin of the resistor R29 is connected with the base B of the switch tube Q26;
an emitter E of the switching tube Q26 is connected with a 1 st pin of the resistor RS and a 2 nd pin of the resistor R32;
the 2 nd pin of the resistor RS is connected with a ground end GND;
the collector C of the switching tube Q26 is connected with the input end VN of the low-side driving circuit;
the input end VN of the low-side driving circuit is connected with the output end VLN of the contactor coil;
the 2 nd pin of the resistor R31 is connected with the collector C of the switch tube Q23;
the base B of the switching tube Q23 is connected with the 1 st pin of the resistor R32;
the emitter E of the switching tube Q23 is connected to the ground GND.
In the invention, in particular, for a low-side driving circuit, the switching tube Q21 is an N-channel enhancement type field effect tube MOSFET;
the switching tubes Q22, Q23, Q24 and Q26 are PNP type triodes;
the switching tube Q25 is an NPN transistor.
In the present invention, in a specific implementation, the SL2 is a control signal terminal of the BMS main control chip, and the control signal SL2 is provided by using a general purpose input/output port GPIO of the BMS main control chip, and the port should have three signal states:
firstly, outputting high level, and switching on a power supply of a contactor coil;
secondly, inputting low level, and disconnecting the power supply of the coil of the contactor;
and thirdly, inputting in a high resistance state, and connecting a power supply of the coil of the contactor.
It should be noted that, when the BMS main control chip is reset, the control signal terminal SL2 should be in a high impedance state.
In the present invention, the low-side driving circuit and the high-side driving circuit are connected to the same contactor coil.
In the invention, in a specific implementation, a direct current power supply VCC is a 12V or 24V direct current power supply and supplies power to a coil of a contactor;
in the invention, VN is the output end of the contactor coil power supply.
In order to more clearly understand the technical solution of the present invention, the operation principle of the low-side driving circuit of the present invention is explained below.
In the present invention, the operation mode of the low-side driving circuit is as follows:
firstly, in the initial state of the low-side driving circuit, a control signal end SL2 of a BMS main control chip is input in a low level or high resistance state, a switch tube Q21, a switch tube Q22, a switch tube Q23, a switch tube Q24, a switch tube Q25 and a switch tube Q26 are all cut off, and a contactor coil does not work;
when the control signal end SL2 of BMS main control chip becomes high level, switch tube Q24 cuts off, switch tube Q21 with switch tube Q22 switches on, switches on switch tube Q26, switches on direct current power supply VCC, and the contactor coil can normally work.
The bias voltage V3 of the base bias loop of the switching tube Q23 is changed from 0V to high potential, so that the switching tube Q23 and the switching tube Q25 are conducted;
the direct current power supply VCC enables the bias voltage V2 to keep a high potential state through the resistor R27, the switch tube Q25, the resistor R28 and the capacitor C21, the switch tube Q26 is continuously conducted, and a self-holding driving effect is achieved.
In a specific implementation, when the control signal terminal SL2 of the BMS main control chip is at a high level, a specific embodiment may be as follows:
when the control signal end SL2 of the BMS main control chip is at a high level of 5V, after the switching tube Q21 is turned on, the base of the switching tube Q22 is connected with the ground end GND through the resistor R23, so that the switching tube Q22 is saturated and turned on, and the dc power VCC is connected to the base bias loop of the switching tube Q26;
after a direct current power supply VCC is divided by the resistor R25 and the resistor R28, a bias voltage V2 of a base bias loop of the switching tube Q26 is changed from 0V to a high potential, the switching tube Q24 is cut off, the switching tube Q26 is conducted, a contactor coil power supply is switched on, and a contactor coil can normally work;
after the switching tube Q26 is turned on, the bias voltage V3 of the base bias loop of the switching tube Q23 is changed from 0V to high potential, so that the switching tube Q23 is turned on, the base of the switching tube Q25 is pulled down to low potential, and the switching tube Q25 is turned on;
the bias voltage V2 is kept at a high potential by the dc power VCC through the resistor R27, the switching tube Q25, the resistor R28, and the capacitor C21, so that the switching tube Q26 is kept in a conducting state, and a self-holding function can be realized.
When the control signal terminal SL2 of the BMS main control chip is changed from a high level to a low level, the switching tube Q21 and the switching tube Q22 are changed from on to off, the dc power supply VCC keeps the voltage of the bias voltage V2 at a high potential through the resistor R27, the switching tube Q25, the resistor R28 and the capacitor C21, so that the switching tube Q24 is changed from off to on, the switching tube Q26 is changed from on to off, the connection between the contactor coil and the dc power supply VCC is disconnected, and the contactor coil stops working;
after the switching tube Q26 is turned off, the switching tube Q23 and the switching tube Q25 are also turned off from on, the connection between the base bias loop of the switching tube Q26 and the dc power supply VCC is disconnected, the bias voltage V2 is maintained in a low potential state, and the switching tube Q26 is locked in an off state.
In particular implementation, when the control signal terminal SL2 of the BMS main control chip is changed from the high level to the low level, a specific embodiment may be as follows:
when the BMS master control chip control signal terminal SL2 is at a low level of 0V, the switching tube Q21 is turned from on to off, the resistor R24 pulls the base voltage of the switching tube Q22 up to the dc power supply VCC, which is equal to the emitter voltage of the switching tube Q22, so that the switching tube Q22 is also turned from on to off, the dc power supply VCC continuously maintains the high potential of the bias voltage V2 through the resistor R27, the switching tube Q25, the resistor R28 and the capacitor C21, so that the base of the switching tube Q24 and the resistor R30 have base current, the switching tube Q24 is turned on, the bias voltage V2 is pulled down from the high potential to the low potential, so that the switching tube Q26 is turned from on to off, and the contactor coil stops working;
after the switching tube Q26 is turned off, the bias voltage V3 of the base bias loop of the switching tube Q23 changes from high potential to 0V, so that the switching tube Q23 changes from on to off;
the resistor R30 pulls the base voltage of the switch tube Q25 up to a direct current power supply VCC, which is equal to the emitter voltage of the switch tube Q22, so that the switch tube Q25 is also switched from on to off, the voltage of the bias voltage V2 is pulled down to 0V from a low potential by the resistor R28, the switch tube Q26 is locked to be in an off state, the contactor coil is kept in a stop state, and the switch tube Q24 is also switched from on to off.
Fourthly, in the power-on state of the contactor coil, at the moment, if the BMS main control chip is reset, the control signal end SL2 is changed from high-level output to high-resistance state input, the switching tube Q21 and the switching tube Q22 are changed from conduction to cut-off, the switching tube Q24 keeps the cut-off state, the capacitor C21 keeps the high potential of the bias voltage V2 unchanged, the switching tube Q26 is kept conducted, the bias voltage V3 is kept unchanged, so that the switching tube Q23 and the switching tube Q25 are kept conducted, and the direct-current power supply VCC is continuously connected;
because the bias voltage V2 is continuously kept unchanged at a high potential by the dc power supply VCC through the resistor R27, the switching tube Q25, the resistor R28 and the capacitor C21, the switching tube Q26, the switching tube Q23 and the switching tube Q25 are always kept in a conducting state, and the contactor coil is always kept in a working state, so that a self-holding function of driving the contactor coil is realized until the voltage of the control signal terminal SL2 becomes a low level.
In concrete implementation, when the BMS host control chip is reset, the specific embodiment may be as follows:
when the control signal end SL2 of the BMS master control chip is at a high level of 5V, the BMS master control chip is reset, the control signal end SL2 is changed from high level output to high resistance input, the switching tube Q21 and the switching tube Q22 are changed from on to off, and the switching tube Q24 is kept in an off state;
the capacitor C21 keeps the high potential of the bias voltage V2 unchanged, the switch tube Q26 is kept conducted, the bias voltage V3 is kept unchanged, the switch tube Q23 and the switch tube Q25 are kept conducted, the direct current power supply VCC keeps the bias voltage V2 to be high potential continuously through the resistor R27, the switch tube Q25, the resistor R28 and the capacitor C21, the switch tube Q26 keeps the conducting state all the time, and the contactor coil also keeps the working state all the time, so that the self-holding function of the contactor coil driving is realized until the control signal end SL2 of the BMS main control chip is changed into low level.
In the present invention, it should be noted that, in terms of specific implementation, the BMS main control chip is a control chip on an existing battery management system BMS. The BMS host control chip may employ the currently popular brand, series and model, such as MC9S12 series of NXP, TC2 series of english-flying, TC265, etc., which is not within the scope of the present invention.
In the present invention, in a specific implementation, the dc contactor coil is a coil of an existing dc contactor, and may be of a currently common brand and model, for example, a macro HFZ16-100/900 dc contactor manufactured by zhejiang hong boat new energy technology limited may be used.
It should be noted that, referring to fig. 3, in particular, in an application, the dc contactor coil may be connected to the low-side driving self-holding circuit and the high-side driving self-holding circuit provided by the present invention at the same time.
For the invention, referring to fig. 3, the high side driving circuit and the low side driving circuit can be respectively connected with the BMS main control chip, and can ensure that the contactor coil is not powered off when the BMS main control chip is abnormally reset, thereby realizing the self-holding function of the contactor coil control loop.
In the present invention, it should be noted that, if the dc contactor coil is driven simultaneously by high and low sides, the high-side driving circuit and the low-side driving circuit may use the same dc power VCC. As shown in fig. 3.
Based on the technical scheme, the invention is a technical scheme which not only occupies less port resources of the BMS main control chip, but also supports multi-path drive expansion, is easier to select devices and has low cost.
In summary, compared with the prior art, the low-side driving self-holding circuit of the direct current contactor coil provided by the invention has the advantages that the hardware circuit design is scientific, the additional port resource of the BMS main control chip is not occupied, the contactor coil can not be powered off when the BMS main control chip is abnormally reset, the self-holding function of the contactor coil control loop is realized, and the production practice significance is great.
In addition, the low-side driving self-holding circuit of the direct current contactor coil provided by the invention can support multi-path driving expansion without adopting a special integrated driving chip, electronic components are of a general application type and are easy to select, a circuit board occupies a small space, the design cost is very low, and the low-side driving self-holding circuit is a technical scheme which is easy to select devices and is low in cost, so that the technical scheme has very high practical value and market popularization value.
The technical scheme provided by the invention can also be applied to electronic and electrical systems of which the driving circuits need self-holding functions in other fields.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (3)
1. A low-side driving self-holding circuit of a direct current contactor coil is characterized by comprising switching tubes Q21-Q26, a capacitor C21, resistors R21-R32 and a resistor RS, wherein:
the 1 st pin of the resistor R21 is respectively connected with the 1 st pin of the resistor R26 and the control signal terminal SL2 of the BMS main control chip;
the 2 nd pin of the resistor R21 is respectively connected with the 1 st pin of the resistor R22 and the grid G of the switching tube Q21;
the source S of the switch tube Q21 is respectively connected with the No. 2 pin of the resistor R22 and the ground end GND;
the drain D of the switching tube Q21 is connected with the 2 nd pin of the resistor R23;
the 1 st pin of the resistor R23 is respectively connected with the base B of the switch tube Q22 and the 2 nd pin of the resistor R24;
an emitter E of the switching tube Q22 is connected with a No. 2 pin of the resistor R25;
a collector C of the switching tube Q22 is respectively connected with an emitter E of the switching tube Q24, a collector C of the switching tube Q25, a 1 st pin of the capacitor C21, a 1 st pin of the resistor R28 and a 1 st pin of the resistor R29;
the 1 st pin of the resistor R24 is respectively connected with a direct current power supply VCC, the 1 st pin of the resistor R25, the 1 st pin of the resistor R27 and the 1 st pin of the resistor R30;
the base B of the switching tube Q24 is connected with the 2 nd pin of the resistor R26;
the collector C of the switching tube Q24 is connected with the ground end GND;
the 2 nd pin of the resistor R27 is connected with the emitter E of the switching tube Q25;
a base B of the switching tube Q25, which is respectively connected with the 1 st pin of the resistor R31 and the 2 nd pin of the resistor R30;
the 2 nd pin of the capacitor C21 and the 2 nd pin of the resistor R28 are respectively connected with a ground terminal GND;
the 2 nd pin of the resistor R29 is connected with the base B of the switch tube Q26;
an emitter E of the switching tube Q26 is connected with a 1 st pin of the resistor RS and a 2 nd pin of the resistor R32;
the 2 nd pin of the resistor RS is connected with a ground end GND;
the collector C of the switching tube Q26 is connected with the input end VN of the low-side driving circuit;
the input end VN of the low-side driving circuit is connected with the output end VLN of the contactor coil;
the 2 nd pin of the resistor R31 is connected with the collector C of the switch tube Q23;
the base B of the switching tube Q23 is connected with the 1 st pin of the resistor R32;
the emitter E of the switching tube Q23 is connected to the ground GND.
2. The low side drive self-holding circuit of claim 1, wherein the switching transistor Q21 is an N-channel enhancement mode field effect transistor MOSFET;
the switching tubes Q22, Q23, Q24 and Q26 are PNP type triodes;
the switching tube Q25 is an NPN transistor.
3. The low-side drive self-holding circuit of claim 1, wherein the operation mode is as follows:
firstly, in the initial state of the low-side driving circuit, a control signal end SL2 of a BMS main control chip is input in a low level or high resistance state, a switch tube Q21, a switch tube Q22, a switch tube Q23, a switch tube Q24, a switch tube Q25 and a switch tube Q26 are all cut off, and a contactor coil does not work;
when the control signal end SL2 of the BMS main control chip is changed into high level, the switching tube Q24 is cut off, the switching tube Q21 is conducted with the switching tube Q22, the switching tube Q26 is conducted, a direct-current power supply VCC is connected, and the contactor coil normally works;
the bias voltage V3 of the base bias loop of the switching tube Q23 is changed from 0V to high potential, so that the switching tube Q23 and the switching tube Q25 are conducted;
a direct-current power supply VCC enables a bias voltage V2 to keep a high potential state through a resistor R27, a switch tube Q25, a resistor R28 and a capacitor C21, and the switch tube Q26 is continuously conducted to play a role in driving self-holding;
when the control signal terminal SL2 of the BMS main control chip is changed from a high level to a low level, the switching tube Q21 and the switching tube Q22 are changed from on to off, the dc power supply VCC keeps the bias voltage V2 unchanged at a high potential through the resistor R27, the switching tube Q25, the resistor R28 and the capacitor C21, so that the switching tube Q24 is changed from off to on, the switching tube Q26 is changed from on to off, the connection between the contactor coil and the dc power supply VCC is disconnected, and the contactor coil stops working;
after the switching tube Q26 is cut off, the switching tube Q23 and the switching tube Q25 are also turned off from conduction, the connection between the base bias loop of the switching tube Q26 and the direct current power supply VCC is cut off, the bias voltage V2 is maintained in a low potential state, and the switching tube Q26 is locked in a cut-off state;
fourthly, in the power-on state of the contactor coil, when the BMS main control chip is reset, the control signal end SL2 is changed from high-level output to high-resistance state input, the switching tube Q21 and the switching tube Q22 are changed from conduction to cut-off, the switching tube Q24 keeps the cut-off state, the capacitor C21 keeps the high potential of the bias voltage V2 unchanged, the switching tube Q26 is kept conducted, the bias voltage V3 is kept unchanged, the switching tube Q23 and the switching tube Q25 are kept conducted, and the direct-current power supply VCC is continuously connected; because the direct current power supply VCC keeps the bias voltage V2 at a high potential through the resistor R27, the switching tube Q25, the resistor R28 and the capacitor C21, the switching tube Q26, the switching tube Q23 and the switching tube Q25 are always kept in a conducting state, and the contactor coil is also always kept in a working state, so that a self-holding function of driving the contactor coil is realized until the control signal SL2 becomes a low level.
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| CN202010987719.4A CN112259414A (en) | 2020-09-18 | 2020-09-18 | Low-side driving self-holding circuit of direct current contactor coil |
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| CN202010987719.4A CN112259414A (en) | 2020-09-18 | 2020-09-18 | Low-side driving self-holding circuit of direct current contactor coil |
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Effective date of registration: 20220120 Address after: 266500 Minshan Road, Huangdao District, Qingdao, Shandong Applicant after: LISHEN (QINGDAO) NEW ENERGY CO.,LTD. Address before: 300384 Tianjin Binhai New Area Binhai high tech Industrial Development Zone Huayuan science and Technology Park (outer ring) 38 Haitai South Road Applicant before: LISHEN POWER BATTERY SYSTEMS Co.,Ltd. |
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