CN111245311A - Pre-charging control circuit based on contactor - Google Patents
Pre-charging control circuit based on contactor Download PDFInfo
- Publication number
- CN111245311A CN111245311A CN201811436610.0A CN201811436610A CN111245311A CN 111245311 A CN111245311 A CN 111245311A CN 201811436610 A CN201811436610 A CN 201811436610A CN 111245311 A CN111245311 A CN 111245311A
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- China
- Prior art keywords
- control circuit
- resistor
- contactor
- capacitor
- contactor coil
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/20—Arrangements for starting
- H02P6/21—Open loop start
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
- H02P27/085—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/027—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an over-current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to a pre-charging control circuit based on a contactor, which comprises a power supply, an inverter external relay switch, a contactor main contact, a driving system, a capacitor pre-charging circuit, an MCU control circuit and a contactor coil control circuit, wherein the contactor main contact is connected with the power supply; the power respectively with external relay switch and capacitor pre-charge circuit connection, contactor main contact respectively with dc-to-ac converter external relay switch, actuating system and contactor coil control circuit connection, contactor coil control circuit respectively with MCU control circuit and actuating system connection, capacitor pre-charge circuit be connected with actuating system. Compared with the prior art, the invention can keep the voltage at two ends of the coil stable, and simultaneously has the advantages of preventing the relay coil from generating interference and pollution to the accessed power supply when being switched on and switched off, and the like.
Description
Technical Field
The invention relates to the field of automobile brushless motor control, in particular to a pre-charging control circuit based on a contactor.
Background
The automobile high-power inverter generally has a large preceding-stage DC-LINK capacitor capacitance value, if a preceding-stage slow starting circuit is not used for pre-charging the DC-LINK capacitor, a very large current can be generated at a driving end at the moment of electrifying a bus, the service life of the capacitor can be reduced by the current, and a driving power device can be damaged. As shown in fig. 1, a conventional inverter drives a power supply structure, and the power supply directly supplies power to a driving system through a switching relay. Therefore, in order to protect the driving circuit and the related period, the pre-charging circuit is added at the end of the power bus so that the driving system can be stably electrified.
Disclosure of Invention
The present invention is directed to overcoming the above-mentioned drawbacks of the prior art and providing a contactor-based precharge control circuit.
The purpose of the invention can be realized by the following technical scheme:
a pre-charging control circuit based on a contactor comprises a power supply, an inverter external relay switch, a contactor main contact, a driving system, a capacitor pre-charging circuit, an MCU control circuit and a contactor coil control circuit;
the power respectively with external relay switch and capacitor pre-charge circuit connection, contactor main contact respectively with dc-to-ac converter external relay switch, actuating system and contactor coil control circuit connection, contactor coil control circuit respectively with MCU control circuit and actuating system connection, capacitor pre-charge circuit be connected with actuating system.
Preferably, the capacitor pre-charging circuit comprises a key switch K3, a diode D1 and a PTC current-limiting resistor R10 which are connected in sequence, wherein the anode of the diode D1 is connected with one end of the key switch K3, the cathode of the diode D1 is connected with one end of the PTC current-limiting resistor R10, the other end of the PTC current-limiting resistor R10 is connected between the main contact of the contactor and the driving system, and the other end of the key switch K3 is connected with a power supply.
Preferably, the driving system includes a MOS transistor M1, a MOS transistor M2 and a capacitor C1, and the MOS transistor M1 and the MOS transistor M2 are connected in series and then connected in parallel to two ends of the capacitor C1.
Preferably, the MOS transistor M1 and the MOS transistor M2 are both NMOS transistors.
Preferably, MCU control circuit include MCU, resistance R1, resistance R2, resistance R3, electric capacity C2 and triode Q1, MCU pass through resistance R2 respectively with electric capacity C2 one end, triode Q1's base be connected, MCU pass through resistance R1 and contactor coil control circuit connection, triode Q1's collecting electrode pass through resistance R3 and contactor coil control circuit connection, triode Q1's projecting pole and contactor coil control circuit connection.
Preferably, the contactor coil control circuit comprises a PWM controller, a MOS transistor Q2, a contactor coil K2, a photocoupler K4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, and a triode Q3;
the PWM controller is respectively connected with an MCU control circuit, one end of a resistor R5 and one end of a photoelectric coupler K4, the other end of the resistor R5 is connected with a grid electrode of an MOS tube Q2, a drain electrode of the MOS tube Q2 is connected with the MCU control circuit, a source electrode of the MOS tube Q2 is connected with one end of a contactor coil K2, the other end of the contactor coil K2 is respectively connected with one end of a resistor R6, one end of a resistor R8 and one end of a resistor R9, the other end of the resistor R6 is connected with the other end of the photoelectric coupler K4, the other end of the resistor R8 is respectively connected with a base electrode of a triode Q3 and one end of a resistor R7, a collector electrode of the triode Q3 is respectively connected with the other end of the resistor R7 and one end of the contactor coil K2, and an emitter electrode of the triode Q3 is connected.
Compared with the prior art, the invention has the following advantages:
the drive pre-charging circuit can avoid heavy current generated at the moment of electrifying the drive circuit, prolong the service life of the DC-LINK capacitor and protect a power device of the drive circuit from being damaged. The direct current contactor can work under the working conditions of high voltage and large current, and is used as a switching device of a pre-charging circuit, high in reliability, convenient to control and low in cost. The inverter MCU is isolated from the coil control circuit of the contactor through the optocoupler, the collated logic circuit is fully protected, and the influence of the interference generated by inductive devices such as coils on the control circuit is prevented. Meanwhile, a coil in the coil control circuit is not directly supplied with power by an external power supply, but a small-sized switch power supply with feedback is formed by utilizing a PWM control chip, a switch MOSFET and the inductance characteristic of the coil, and the voltage difference between two ends of the coil meets the closing requirement of the contactor through feedback control. The design can keep the voltage at two ends of the coil stable, and meanwhile, the interference and pollution to the connected power supply during the switching of the relay coil are prevented.
Drawings
FIG. 1 is a circuit diagram of the prior art;
FIG. 2 is a block diagram of the present invention;
fig. 3 is a specific circuit diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
The circuit of the invention adopts a direct current contactor to control the on-off of the bus power supply, and the coil of the contactor is controlled by the MCU through a certain circuit, thereby achieving the purpose of controlling the pre-charging time by the MCU.
As shown in fig. 2, a pre-charging control circuit based on a contactor comprises a power supply 101, an inverter external relay switch 102, a contactor main contact 103, a driving system 104, a capacitor pre-charging circuit 105, an MCU control circuit 106 and a contactor coil control circuit 107;
the power supply 101 is respectively connected with an external relay switch 102 and a capacitor pre-charging circuit 105, the contactor main contact 103 is respectively connected with an inverter external relay switch 102, a driving system 104 and a contactor coil control circuit 107, the contactor coil control circuit 107 is respectively connected with an MCU control circuit 106 and the driving system 104, and the capacitor pre-charging circuit 105 is connected with the driving system 104.
As shown in fig. 3, the capacitor pre-charging circuit 105 includes a key switch K3, a diode D1 and a PTC current-limiting resistor R10, which are connected in sequence, wherein an anode of the diode D1 is connected with one end of the key switch K3, a cathode of the diode D1 is connected with one end of the PTC current-limiting resistor R10, the other end of the PTC current-limiting resistor R10 is connected between the contactor main contact 103 and the driving system 104, and the other end of the key switch K3 is connected with the power source 101.
The driving system 104 comprises a MOS transistor M1, a MOS transistor M2 and a capacitor C1, wherein the MOS transistor M1 and the MOS transistor M2 are connected in series and then connected in parallel to two ends of the capacitor C1. The MOS transistor M1 and the MOS transistor M2 are both NMOS transistors.
The contactor coil control circuit 107 comprises a PWM controller, a MOS transistor Q2, a contactor coil K2, a photoelectric coupler K4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9 and a triode Q3; the PWM controller is respectively connected with an MCU control circuit 106, one end of a resistor R5 and one end of a photoelectric coupler K4, the other end of the resistor R5 is connected with a grid electrode of an MOS tube Q2, a drain electrode of the MOS tube Q2 is connected with the MCU control circuit 106, a source electrode of the MOS tube Q2 is connected with one end of a contactor coil K2, the other end of the contactor coil K2 is respectively connected with one end of a resistor R6, one end of a resistor R8 and one end of a resistor R9, the other end of the resistor R6 is connected with the other end of the photoelectric coupler K4, the other end of the resistor R8 is respectively connected with a base electrode of a triode Q3 and one end of a resistor R7, a collector electrode of the triode Q3 is respectively connected with the other end of the resistor R7 and one end of the contactor coil K2, and an emitter electrode of the triode Q3 is connected.
As shown in fig. 3, the circuit of the present invention is explained in detail, when the inverter external relay switch 102 is closed, the system starts to be powered up after the key switch is closed, at this time, the DC-LINK capacitor starts to be charged through the capacitor pre-charging circuit 105, the charging current is controlled by the PTC current-limiting resistor, and the low-voltage control circuit also starts to work after being charged through the pre-charging circuit. After the pre-charging is completed, the MCU control circuit 106 sends a signal to the contactor coil control circuit 107, the contactor coil control circuit 107 receives the signal to control the contactor coil to be powered on, the contactor main contact 103 is closed, and the driving system 104 is powered on to start working.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A pre-charging control circuit based on a contactor is characterized by comprising a power supply (101), an inverter external relay switch (102), a contactor main contact (103), a driving system (104), a capacitor pre-charging circuit (105), an MCU control circuit (106) and a contactor coil control circuit (107);
the power supply (101) is respectively connected with an external relay switch (102) and a capacitor pre-charging circuit (105), a contactor main contact (103) is respectively connected with an inverter external relay switch (102), a driving system (104) and a contactor coil control circuit (107), the contactor coil control circuit (107) is respectively connected with an MCU control circuit (106) and the driving system (104), and the capacitor pre-charging circuit (105) is connected with the driving system (104).
2. A contactor-based precharge control circuit according to claim 1, wherein said capacitor precharge circuit (105) comprises a key switch K3, a diode D1 and a PTC current limiting resistor R10 connected in sequence, the anode of said diode D1 is connected to one end of the key switch K3, the cathode is connected to one end of the PTC current limiting resistor R10, the other end of said PTC current limiting resistor R10 is connected between the main contact (103) of the contactor and the driving system (104), and the other end of said key switch K3 is connected to the power supply (101).
3. The contactor-based precharge control circuit according to claim 1, wherein the driving system (104) comprises a MOS transistor M1, a MOS transistor M2 and a capacitor C1, and the MOS transistor M1 and the MOS transistor M2 are connected in series and then connected in parallel to two ends of the capacitor C1.
4. The contactor-based precharge control circuit of claim 3, wherein the MOS transistor M1 and the MOS transistor M2 are NMOS transistors.
5. The contactor-based precharge control circuit according to claim 1, wherein said MCU control circuit (106) comprises an MCU, a resistor R1, a resistor R2, a resistor R3, a capacitor C2 and a transistor Q1, said MCU is connected to one end of a capacitor C2 and a base of a transistor Q1 through a resistor R2, said MCU is connected to the contactor coil control circuit (107) through a resistor R1, a collector of a transistor Q1 is connected to the contactor coil control circuit (107) through a resistor R3, and an emitter of a transistor Q1 is connected to the contactor coil control circuit (107).
6. The contactor-based precharge control circuit according to claim 5, wherein the contactor coil control circuit (107) comprises a PWM controller, a MOS transistor Q2, a contactor coil K2, a photocoupler K4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9 and a transistor Q3;
the PWM controller is respectively connected with an MCU control circuit (106), one end of a resistor R5 and one end of a photoelectric coupler K4, the other end of the resistor R5 is connected with a grid electrode of an MOS tube Q2, a drain electrode of the MOS tube Q2 is connected with the MCU control circuit (106), a source electrode of the MOS tube Q2 is connected with one end of a contactor coil K2, the other end of the contactor coil K2 is respectively connected with one end of a resistor R6, one end of a resistor R8 and one end of a resistor R9, the other end of the resistor R6 is connected with the other end of the photoelectric coupler K4, the other end of the resistor R8 is respectively connected with a base electrode of a triode Q3 and one end of a resistor R7, a collector electrode of the triode Q3 is respectively connected with the other end of the resistor R7 and one end of the contactor coil K2, and an emitter electrode of the triode Q3 is connected with the other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811436610.0A CN111245311A (en) | 2018-11-28 | 2018-11-28 | Pre-charging control circuit based on contactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811436610.0A CN111245311A (en) | 2018-11-28 | 2018-11-28 | Pre-charging control circuit based on contactor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111245311A true CN111245311A (en) | 2020-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811436610.0A Pending CN111245311A (en) | 2018-11-28 | 2018-11-28 | Pre-charging control circuit based on contactor |
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| Country | Link |
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| CN (1) | CN111245311A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112822796A (en) * | 2020-12-31 | 2021-05-18 | 江西江铃集团新能源汽车有限公司 | PTC device control circuit |
-
2018
- 2018-11-28 CN CN201811436610.0A patent/CN111245311A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112822796A (en) * | 2020-12-31 | 2021-05-18 | 江西江铃集团新能源汽车有限公司 | PTC device control circuit |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200605 |