CN114337282B - A vehicle and a switch control circuit thereof - Google Patents
A vehicle and a switch control circuit thereof Download PDFInfo
- Publication number
- CN114337282B CN114337282B CN202111659308.3A CN202111659308A CN114337282B CN 114337282 B CN114337282 B CN 114337282B CN 202111659308 A CN202111659308 A CN 202111659308A CN 114337282 B CN114337282 B CN 114337282B
- Authority
- CN
- China
- Prior art keywords
- electrically connected
- transistor
- circuit
- transformer
- mos transistor
- Prior art date
- 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.)
- Active
Links
- 238000002955 isolation Methods 0.000 claims description 59
- 239000003990 capacitor Substances 0.000 claims description 50
- 238000004804 winding Methods 0.000 description 31
- 238000010586 diagram Methods 0.000 description 12
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Electronic Switches (AREA)
Abstract
The invention discloses a vehicle and a switch control circuit thereof, which are used for controlling on/off of a switch, wherein the switch comprises a first MOS tube and a second MOS tube, the switch control circuit comprises an isolation amplifying circuit and a driving circuit, the isolation amplifying circuit is respectively and electrically connected with the second power supply and the input end of the driving circuit, the isolation amplifying circuit is used for amplifying a second power supply signal provided by the second power supply and unidirectionally transmitting the amplified second power supply signal to the driving circuit, the control end of the driving circuit is electrically connected with an external controller, the output end of the driving circuit is electrically connected with the control electrodes of the first MOS tube and the second MOS tube, and the driving circuit is used for controlling the first MOS tube and the second MOS tube to be on/off according to a switch control signal provided by the external controller and the amplified second power supply signal, so that the driving of the first MOS tube M1 and the second MOS tube M2 can be realized only by using a second power supply E2 with smaller voltage value, the power supply setting in the circuit is reduced, and the circuit structure is facilitated to be simplified.
Description
Technical Field
The embodiment of the invention relates to the technical field of vehicle-mounted power supply, in particular to a vehicle and a switch control circuit thereof.
Background
In the prior art, a power supply is usually provided to high-power load equipment such as an alternating current motor or a direct current motor through an MOS tube, a driving circuit for driving the MOS tube is usually formed by a relay, the sensitivity is poor, the occupied space is large, the relay has large energy impact during controlling suction due to the existence of a coil, and various problems such as large energy consumption and large electromagnetic interference exist, so that a driving signal of the MOS tube is unstable, in addition, because the MOS tube needs large driving voltage, when the MOS tube is driven through the relay, a large power supply is also required to be provided for driving the MOS tube on the basis of providing the power supply required by driving the relay, and the simplified design of the circuit is not facilitated.
Disclosure of Invention
The invention provides a vehicle and a switch control circuit thereof, which are used for realizing a MOS tube driving circuit with a simpler circuit structure.
In a first aspect, an embodiment of the present invention provides a switch control circuit, configured to control on or off of a switch, where the switch includes a first MOS transistor and a second MOS transistor, a first pole of the first MOS transistor is electrically connected to a first power supply, a second pole of the first MOS transistor is electrically connected to a second pole of the second MOS transistor, and the first pole of the second MOS transistor is electrically connected to a load, and the switch control circuit includes an isolation amplifying circuit and a driving circuit;
The isolation amplifying circuit is used for amplifying a second power supply signal provided by the second power supply and unidirectionally transmitting the amplified second power supply signal to the driving circuit;
The control end of the driving circuit is electrically connected with an external controller, the output end of the driving circuit is electrically connected with the control electrodes of the first MOS tube and the second MOS tube, and the driving circuit is used for controlling the first MOS tube and the second MOS tube to be conducted or disconnected according to a switch control signal provided by the external controller and the amplified second power supply signal.
Optionally, the isolation amplifying circuit comprises a first transistor, a second transistor, a first capacitor, a second capacitor, a third capacitor, a first transformer and a rectifying circuit;
A first electrode of the first transistor is electrically connected with a first end of a main coil in the first transformer and a first end of the first capacitor, a control electrode of the first transistor is electrically connected with a first end of the second capacitor, a first end of the third capacitor, a second end of the main coil in the first transformer and the second power supply, and a second electrode of the first transistor is grounded;
The first electrode of the second transistor is electrically connected with the second end of the second capacitor and the third end of the main coil in the first transformer, the control electrode of the second transistor is electrically connected with the second end of the first capacitor, the second end of the third capacitor, the second end of the main coil in the first transformer and the second power supply, and the second electrode of the second transistor is grounded;
The input end of the rectifying circuit is electrically connected with the fourth end and the sixth end of the auxiliary coil in the first transformer, and the output end of the rectifying circuit is connected with the input end of the driving circuit;
The second end of the primary coil in the first transformer is located between the first end and the third end of the primary coil in the first transformer, and the fifth end of the secondary coil in the first transformer is located between the fourth end and the sixth end of the secondary coil in the first transformer.
Optionally, the rectifying circuit includes a first diode and a second diode;
The anode of the first diode is electrically connected with the fourth end of the secondary coil in the first transformer, and the cathode of the first diode is electrically connected with the input end of the driving circuit;
the anode of the second diode is electrically connected with the sixth end of the secondary coil in the first transformer, and the cathode of the second diode is electrically connected with the input end of the driving circuit.
Optionally, the driving circuit includes a driving chip;
The power supply end of the driving chip is electrically connected with the second power supply, the control end of the driving chip is electrically connected with the external controller, the first input end of the driving chip is electrically connected with the output end of the isolation amplifying circuit, the second input end of the driving chip floats to the ground, and the output end of the driving chip is electrically connected with the control electrodes of the first MOS tube and the second MOS tube.
Optionally, the driving circuit comprises a push-pull circuit, wherein the push-pull circuit comprises a third transistor and a fourth transistor;
The control electrodes of the third transistor and the fourth transistor are electrically connected with the external controller, the first electrode of the third transistor is electrically connected with the output end of the isolation amplifying circuit, the second electrode of the third transistor is electrically connected with the second electrode of the fourth transistor, the control electrodes of the first MOS transistor and the second MOS transistor, and the first electrode of the fourth transistor floats.
Optionally, the driving circuit further includes a first isolation circuit, the second power supply and the external controller are electrically connected with the push-pull circuit through the first isolation circuit, and the first isolation circuit is configured to unidirectionally transmit a driving signal to the push-pull circuit according to the second power supply signal and the switch control signal.
Optionally, the first isolation circuit comprises an optocoupler isolator, wherein the optocoupler isolator comprises a light emitting diode and a phototriode;
the anode of the light emitting diode is electrically connected with the second power supply, and the cathode of the light emitting diode is electrically connected with the external controller;
The first electrode of the phototriode is electrically connected with the output end of the isolation amplifying circuit, and the second electrode of the phototriode is electrically connected with the control electrodes of the third transistor and the fourth transistor.
Optionally, the driving circuit further includes a second isolation circuit, and the second isolation circuit is electrically connected between the output end of the push-pull circuit and the control electrode of the first MOS transistor and the control electrode of the second MOS transistor.
Optionally, the second isolation circuit includes a second transformer;
the first end of the main coil in the second transformer is electrically connected with the second pole of the third transistor and the second pole of the fourth transistor, the second end of the main coil in the second transformer floats to the ground, the third end of the auxiliary coil in the second transformer is electrically connected with the control poles of the first MOS tube and the second MOS tube, and the fourth end of the auxiliary coil in the second transformer is electrically connected with the second poles of the first MOS tube and the second MOS tube.
In a second aspect, an embodiment of the present invention further provides a vehicle, including the switch control circuit described above.
According to the switch control circuit provided by the embodiment of the invention, the second power supply signal provided by the second power supply is amplified through the isolation amplifying circuit, and the amplified second power supply signal is provided to the driving circuit, so that when the driving circuit is conducted, the amplified second power supply signal can be provided to the control electrodes of the first MOS tube and the second MOS tube, the first MOS tube and the second MOS tube are controlled to be conducted, the first power supply signal provided by the first power supply can be provided by the first MOS tube and the second MOS tube to be loaded for supplying power to the load, the driving of the first MOS tube M1 and the second MOS tube M2 can be realized only by the second power supply E2 with smaller voltage value, the power supply setting in the circuit is reduced, and the circuit structure is facilitated to be simplified.
Drawings
Fig. 1 is a schematic structural diagram of a switch control circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another switch control circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a switch control circuit according to another embodiment of the present invention;
FIG. 4 is a schematic diagram of a switch control circuit according to another embodiment of the present invention;
FIG. 5 is a schematic diagram of a switch control circuit according to another embodiment of the present invention;
Fig. 6 is a schematic structural diagram of another switch control circuit according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
The embodiment of the invention provides a switch control circuit for controlling on/off of a switch, and fig. 1 is a schematic structural diagram of the switch control circuit provided by the embodiment of the invention, as shown in fig. 1, the switch comprises a first MOS tube M1 and a second MOS tube M2, a first pole of the first MOS tube M1 is electrically connected with the first power E1, a second pole of the first MOS tube M1 is electrically connected with a second pole of the second MOS tube M2, a first pole of the second MOS tube M2 is electrically connected with a load A0, the switch control circuit comprises an isolation amplifying circuit 10 and a driving circuit 20, the isolation amplifying circuit 10 is respectively electrically connected with the second power E2 and an input end of the driving circuit 20, the isolation amplifying circuit 10 is used for amplifying a second power signal provided by the second power E2 and transmitting the amplified second power signal to the driving circuit 20 in one direction, a control end of the driving circuit 20 is electrically connected with an external controller 30, an output end of the driving circuit 20 is electrically connected with a control pole of the first MOS tube M1 and the second MOS tube M2, and the output end of the driving circuit 20 is electrically connected with the control circuit 20 for switching on/off the first power E2 and the second power E2 or the second MOS tube 2 according to the second power signal provided by the external controller 30.
Specifically, the isolation amplifying circuit 10 can amplify the second power signal provided by the second power E2, the amplification multiple can be set automatically according to the requirement, the amplified second power signal can be transmitted to the input end of the driving circuit 20 in a unidirectional manner by the isolation amplifying circuit 10, the driving circuit 20 can be turned on or off according to the switch control signal provided by the external controller 30, when the driving circuit 20 is turned on under the control of the switch control signal, the received amplified second power signal can be transmitted to the control electrode of the first MOS tube M1 and the second MOS tube M2 so as to control the first MOS tube M1 and the second MOS tube M2 to be turned on, so that the turned-on first power signal provided by the first power E1 can be transmitted to the load A0 by the first MOS tube M1 and the second MOS tube M2, the driving of the first MOS tube M1 and the second MOS tube M2 can be realized only by using a second power E2 with smaller voltage value, the power supply setting in the circuit is reduced, and the circuit structure is facilitated. The first power signal provided by the second power E2 may be 5V.
In an exemplary embodiment, the first MOS transistor M1 and the second MOS transistor M2 may be N-type MOS transistors, the first electrodes of the first MOS transistor M1 and the second MOS transistor M2 are drain electrodes, the second electrodes are source electrodes, and the control electrodes are gate electrodes, and in order to avoid electrostatic damage of the MOS transistors, a body diode is usually disposed in the MOS transistor, and in the N-type MOS transistor adopted in the embodiment of the present invention, an anode of the body diode in the MOS transistor is electrically connected with a source electrode of the MOS transistor, and a cathode is electrically connected with a drain electrode of the MOS transistor. If only the second MOS transistor M2 is electrically connected between the first power supply E1 and the load A0, when the second MOS transistor M2 is in the off state, a small electric signal flows from the first power supply E1 to the load A0 through the body diode of the second MOS transistor M2, so that the body diode of the first MOS transistor M1 can prevent the electric signal from flowing to the second MOS transistor M2, thereby preventing the electric signal from being transmitted to the load A0, or if only the first MOS transistor M1 is electrically connected between the first power supply E1 and the load A0, the small electric signal flows from the body diode of the first MOS transistor M1 to the first power supply E1 when the first MOS transistor M1 is in the off state, and therefore, the body diode of the second MOS transistor M2 can prevent the electric signal from flowing to the first MOS transistor M1 through the body diode of the second MOS transistor M2, thereby preventing the electric signal from flowing to the first MOS transistor M1, and preventing the electric signal from being charged to the first power supply E1.
In addition, the switch may further include a first resistor R1 and a zener diode D0, where the first resistor R1 is electrically connected between the gates and sources of the first MOS transistor and the second MOS transistor, the anode of the zener diode D0 is electrically connected to the sources of the first MOS transistor and the second MOS transistor, and the cathode is electrically connected to the gates of the first MOS transistor and the second MOS transistor. The first resistor R1 is configured to make a potential difference between the electric potentials of the gates of the first MOS transistor M1 and the second MOS transistor M2 greater than a conduction threshold when the driving circuit 20 provides the amplified second power supply signal to the gates of the first MOS transistor M1 and the second MOS transistor M2, so that the first MOS transistor M1 and the second MOS transistor M2 are turned on, or to make the electric potentials of the gates of the first MOS transistor M1 and the second MOS transistor M2 equal to the electric potentials of the source electric potentials when the low-level signal for disconnecting the gates of the first MOS transistor M1 and the second MOS transistor M2 is provided to the gates of the first MOS transistor M1 and the second MOS transistor M2, so that the first MOS transistor M1 and the second MOS transistor M2 can be disconnected, and the zener diode D0 can stabilize the electric potentials of the gates of the first MOS transistor and the second MOS transistor at a preset value when the voltage signal received by the gates of the first MOS transistor and the second MOS transistor is too large, so as to avoid the first MOS transistor and the second MOS transistor from being damaged due to voltage impact.
According to the switch control circuit provided by the embodiment of the invention, the second power supply signal provided by the second power supply is amplified through the isolation amplifying circuit, and the amplified second power supply signal is provided to the driving circuit, so that when the driving circuit is conducted, the amplified second power supply signal can be provided to the control electrodes of the first MOS tube and the second MOS tube, the first MOS tube and the second MOS tube are controlled to be conducted, the first power supply signal provided by the first power supply can be provided by the first MOS tube and the second MOS tube to be loaded for supplying power to the load, the driving of the first MOS tube M1 and the second MOS tube M2 can be realized only by the second power supply E2 with smaller voltage value, the power supply setting in the circuit is reduced, and the circuit structure is facilitated to be simplified.
Optionally, fig. 2 is a schematic structural diagram of another switch control circuit provided in the embodiment of the present invention, as shown in fig. 2, the isolation amplifying circuit 10 includes a first transistor T1, a second transistor T2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first transformer 11 and a rectifier circuit 12, where a first pole of the first transistor T1 is electrically connected to a first end a of the main coil in the first transformer 11 and a first end of the first capacitor C1, a control pole of the first transistor T1 is electrically connected to a first end of the second capacitor C2, a first end b of the third capacitor C3, a second end b of the first transformer 11 and a second power supply E2, a second pole of the second transistor T2 is electrically connected to a second end C of the main coil in the first transformer 11, a control pole of the second transistor T2 is electrically connected to a second end a first end a of the first capacitor C1, a first end b of the third capacitor C3 is electrically connected to a second end C of the second transformer 11, a second end b of the second transformer 11 is electrically connected to a third end C of the second transformer 11, a second pole of the second transistor T2 is electrically connected to a third end C of the main coil in the first transformer 11, a second end b of the second transformer 11 is electrically connected to a third end b of the second transformer 11, a third end b of the second primary coil is electrically connected to a third end C2 and a third end C of the second primary coil 11 is electrically connected to a third end C2, a third end of the second primary coil is electrically connected to a third end C2, a third end C is electrically connected to a third end C2 and a third end C is electrically between a third end C11 is electrically.
Specifically, the second power signal provided by the second power source E may be transmitted to the ground GND through the second end b of the main winding of the first transformer 11, the first end a and the first transistor T1, and the second power signal may also be transmitted to the ground GND through the third end c of the second end b of the main winding of the first transformer 11 and the second transistor T2, where, for example, the first transistor T1 and the second transistor T2 are preferably N-type transistors, and the first poles of the first transistor T1 and the second transistor T2 are both collectors, the second poles are both emitters, and the control poles are all bases. When the second power signal provided by the second power source E is transmitted to the base of the first transistor T1 to control the first transistor T1 to be turned on, the second power signal passes through the second end b of the main coil of the first transformer 11, The first terminal a and the first transistor T1 are transmitted to the ground GND, at this time, the potential of the first pole of the first transistor T1 is pulled down to be a low potential, so that the first capacitor C1 is discharged, and thus the potential of the control pole of the second transistor T2 is pulled down, the second transistor T2 is in an off state, at this time, the potential of the third terminal C of the main coil in the first transformer 11 is a multiple of the potential of the second terminal b, for example, when the number of turns of the coil between the first terminal a and the second terminal b is the same as the number of turns of the coil between the second terminal b and the third terminal C, vc=2×vb, so that the potential of the third terminal C of the main coil in the first transformer 11 can charge the second capacitor C2, and thus the second capacitor C2 can charge the third capacitor C3, at this time, the first terminal of the third capacitor C3 is larger than the discharge amount of the second terminal, and when the potential of the second terminal of the third capacitor C3 is larger than the on threshold; the second transistor T2 is turned on to make the potential of the collector electrode thereof be pulled down, so that the second capacitor C2 is discharged, and thus the potential of the base electrode of the first transistor T1 is pulled down, the first transistor T1 is turned off, and the potential of the first end a of the primary winding of the first transformer 11 is a multiple of the potential of the second end b, for example, va=2×vb when the number of turns of the windings between the first end a and the second end b is the same as the number of turns of the windings between the second end b and the third end C, so that the potential of the first end a of the primary winding of the first transformer 11 charges the first capacitor, and the first capacitor V1 charges the third capacitor C3, and the charge amount of the second end of the third capacitor C3 is larger than the discharge amount of the first end, and when the potential of the first end of the third capacitor C3 is larger than the on threshold, the first transistor T1 is turned on, so that the first transistor T1 and the second transistor T2 are alternately turned on, the dc signal provided by the second power source E2 may be converted into an ac signal so that it may be transmitted through the first transformer 11 in isolation. When the first transistor T1 is turned on, the voltage Vba of the primary winding of the first transformer 11 is isolated and transmitted to the sixth end f and the fifth end E of the secondary winding, the sixth end f and the second end b may be set to be the same name ends, and the number of turns of the secondary winding between the sixth end f and the fifth end E may be set to be 3 times that of the primary winding between the first end a and the second end b, so that the induced voltage Vfe =3×vba of the secondary winding of the first transformer 11 and the second power signal provided by the second power source E2 may be amplified by 3 times and then provided to the input end of the driving circuit 20, and in addition, the second end b of the first transformer 11 and the fourth end d of the secondary winding may be set to be the same name ends, and the number of turns of the secondary winding between the fourth end d and the fifth end E may be set to be 3 times that of the primary winding between the third end c and the second end b, based on the same principle that when the second transistor is turned on, the induced voltage vbc of the secondary winding of the first transformer 11 and the fourth end d=3×vdc may be set.
The fifth end e of the secondary winding in the first transformer 11 may be electrically connected to the sources of the first MOS transistor M1 and the second MOS transistor M2, so as to provide a voltage with a lower potential for the sources of the first MOS transistor M1 and the second MOS transistor M2 when the first MOS transistor M1 and the second MOS transistor M2 are controlled to be turned on, thereby ensuring that the first MOS transistor M1 and the second MOS transistor M2 can be stably turned on.
Alternatively, referring to fig. 2, the rectifying circuit includes a first diode D1 and a second diode D2, where an anode of the first diode D1 is electrically connected to a fourth end D of the secondary winding in the first transformer T1, a cathode of the first diode D1 is electrically connected to the input terminal of the driving circuit 20, an anode of the second diode D2 is electrically connected to a sixth end f of the secondary winding in the first transformer T1, and a cathode of the second diode D2 is electrically connected to the input terminal of the driving circuit 20.
Specifically, the first diode D1 may rectify the induced voltage Vfe on the secondary side of the first transformer 11 into a voltage signal similar to dc and transmit the rectified voltage signal to the input end of the driving circuit 20, and the second diode D2 may rectify the induced voltage Vde on the secondary side of the first transformer 11 into a voltage signal similar to dc and transmit the rectified voltage signal to the input end of the driving circuit 20.
The isolation amplifying circuit 10 may further include a second resistor R2, a third resistor R3, and a filter circuit, the second resistor R2 is electrically connected between the first end of the second capacitor C2 and the second end b of the main winding in the first transformer 11, the third resistor R3 is electrically connected between the second end of the first capacitor C1 and the second end b of the main winding in the first transformer 11, the second resistor R2 and the third resistor R3 are used for current limiting, the filter circuit may include a fourth capacitor C4 and a fifth capacitor C5, the first ends of the fourth capacitor C4 and the fifth capacitor C5 are electrically connected with the fifth end e of the sub-winding in the first transformer 11, the second ends of the fourth capacitor C4 and the fifth capacitor C5 are electrically connected with the input end of the driving circuit 20, and the fourth capacitor C4 and the fifth capacitor C5 may filter the electric signal provided to the driving circuit 20. The sources of the first MOS transistor M1 and the second MOS transistor M2 may be electrically connected to the fifth end e of the secondary winding in the first transformer 11, and since the potential of the fifth end e is always at a low potential compared to the potentials of the fourth end d and the sixth end f, the potential of the fifth end e may be used as the source provided to the first MOS transistor M1 and the second MOS transistor M2 so as to form a potential difference between the gates and the sources of the first MOS transistor M1 and the second MOS transistor M2 for conducting.
Optionally, fig. 3 is a schematic structural diagram of a further switch control circuit according to the embodiment of the present invention, as shown in fig. 3, the driving circuit 20 includes a driving chip 21, a power supply end Anode of the driving chip 21 is electrically connected to a second power supply E2, a control end Cathode of the driving chip 21 is electrically connected to an external controller 30, a first input end Vcc of the driving chip 21 is electrically connected to an output end of the isolation amplifying circuit 10, a second input end Vee of the driving chip 21 floats, and an output end Vout of the driving chip 21 is electrically connected to control electrodes of the first MOS transistor M1 and the second MOS transistor M2.
Specifically, the second power supply E2 may provide a power supply for the driving chip 21, where the driving chip 21 may be turned on or off according to a switch control signal provided by the external controller 30, and when the driving chip 21 is turned on under the control of the switch control signal, the amplified second power supply signal received by the first input end Vcc of the driving chip may be transmitted to the control electrodes of the first MOS transistor M1 and the second MOS transistor M2 through the output end Vout thereof, so as to control the first MOS transistor M1 and the second MOS transistor M2 to be turned on. The second input terminal Vee of the driving chip 21 floats to receive the low level signal, so that it can be electrically connected to the fifth terminal e of the secondary winding in the first transformer 11, so that the second input terminal Vee receives the low level signal compared with the voltage signal received by the first input terminal Vcc. The driving chip 21 is preferably an isolated gate driver UCC23313-Q1, which has the characteristics of strong anti-interference capability, low signal ship delay, good compatibility and high reliability, and can realize high-current driving.
Optionally, fig. 4 is a schematic structural diagram of a further switch control circuit according to an embodiment of the present invention, as shown in fig. 4, the driving circuit 20 includes a push-pull circuit 22, the push-pull circuit 22 includes a third transistor T3 and a fourth transistor T4, control poles of the third transistor T3 and the fourth transistor T4 are electrically connected to the external controller 30, a first pole of the third transistor T3 is electrically connected to an output terminal of the isolation amplifying circuit 10, a second pole of the third transistor T3 is electrically connected to a second pole of the fourth transistor T4, a control pole of the first MOS transistor M1 and a control pole of the second MOS transistor M2, and a first pole of the fourth transistor T4 floats.
Specifically, the third transistor T3 is preferably an N-type transistor, the fourth transistor T4 is preferably a P-type transistor, when the switching control signal provided by the external controller 30 is at a high level, the third transistor T3 is turned on, the fourth transistor T4 is turned off, so that the voltage signal received from the isolation amplifying circuit 10 at the collector of the third transistor T3 can be transmitted to the control electrodes of the first MOS transistor M1 and the second MOS transistor M2 through the third transistor T3, the first MOS transistor M1 and the second MOS transistor M2 are controlled to be turned on, when the switching control signal provided by the external controller 30 is at a low level, the fourth transistor T4 is turned on, the third transistor T3 is turned off, and thus the voltage stored between the gates and the sources of the first MOS transistor M1 and the second MOS transistor M2 can be discharged through the third transistor T3 until the potential difference between the gates and the sources of the first MOS transistor M1 and the second MOS transistor M2 is smaller than the on threshold. The push-pull circuit 22 may further include a fourth resistor R4 and a fifth resistor R5, where the fourth resistor R4 is electrically connected between the connection node of the third transistor T3 and the fourth transistor T4 and the control poles of the first MOS transistor M1 and the second MOS transistor M2 for current limiting, and the control poles of the third transistor T3 and the fourth transistor T4 may be further floated by the fifth resistor R5 or electrically connected to the fifth end e of the secondary winding in the first transformer 11 by the fifth resistor R5, and the fifth resistor R5 is used for voltage division. The first poles of the third transistor T3 and the fourth transistor T4 are collectors, the second poles are emitters, and the control poles are bases.
According to the switch control circuit provided by the embodiment of the invention, the push-pull circuit comprising the two triodes is arranged to drive the first MOS tube M1 and the second MOS tube M2, and on the basis that a larger driving voltage can be output, compared with a mode of adopting a driving chip, the switch control circuit can meet the requirement of low-speed stable switching of the first MOS tube M1 and the second MOS tube M2, has lower cost and is beneficial to popularization and use.
Optionally, fig. 5 is a schematic structural diagram of a further switch control circuit according to an embodiment of the present invention, as shown in fig. 5, the driving circuit 20 further includes a first isolation circuit 23, the second power source E2 and the external controller 30 are electrically connected to the push-pull circuit 22 through the first isolation circuit 23, and the first isolation circuit 23 is configured to unidirectionally transmit the driving signal to the push-pull circuit 22 according to the second power source signal and the switch control signal.
Specifically, the driving circuit may further include a push-pull circuit 22 and a first isolation circuit 23, so that the first isolation circuit 23 can be conducted or disconnected under the control of the external controller 30, and when the first isolation circuit is conducted, the third transistor T3 in the push-pull circuit 22 can be controlled to be conducted, so as to control the first MOS transistor M1 and the second MOS transistor M2 to be conducted, thereby realizing isolation transmission of the second power signal.
The first isolation circuit 23 includes an optocoupler 231, the optocoupler 231 includes a light emitting diode and a phototransistor, an anode of the light emitting diode is electrically connected to the second power source E2, a cathode of the light emitting diode is electrically connected to the external controller 30, a first pole of the phototransistor is electrically connected to an output terminal of the isolation amplifying circuit 10, and a second pole of the phototransistor is electrically connected to control terminals of the third transistor T3 and the fourth transistor T4.
Specifically, when the switch control signal provided by the external controller 30 is at a low level, the light emitting diode in the optocoupler isolator 231 is turned on to emit light, so as to control the phototransistor to be turned on, the voltage signal received by the first pole of the phototransistor from the isolation amplifying circuit 10 can be transmitted to the bases of the third transistor T3 and the fourth transistor T4, so as to control the third transistor T3 to be turned on, and the fourth transistor T4 to be turned off, or when the switch control signal provided by the external controller 30 is at a high level, the light emitting diode in the optocoupler isolator 231 is turned off, so as to control the phototransistor to be in an off state, and the voltage signal received by the first pole of the phototransistor from the isolation amplifying circuit 10 cannot be transmitted to the bases of the third transistor T3 and the fourth transistor T4, so as to control the third transistor T3 to be turned off, and the fourth transistor T4 to be turned on. The first pole of the phototriode is a collector electrode, and the second pole is an emitter electrode. The first isolation circuit 23 may further include a sixth resistor R6 and a seventh resistor R7, wherein first ends of the sixth resistor R6 and the seventh resistor R7 are electrically connected to the anode of the light emitting diode in the optocoupler isolator 231, and second ends of the sixth resistor R6 and the seventh resistor R7 are electrically connected to the second power source E2, and the sixth resistor R6 and the seventh resistor R are used for voltage division.
According to the switch control circuit provided by the embodiment of the invention, the first MOS tube M1 and the second MOS tube M2 are driven through the optocoupler isolator and the push-pull circuit comprising the two triodes, the first MOS tube M1 and the second MOS tube M2 can be driven to be stably turned on or turned off, and compared with a traditional relay mode, the energy consumption is greatly reduced, and the continuous voyage time is facilitated to be improved in the field of electric automobiles.
Optionally, fig. 6 is a schematic structural diagram of a further switch control circuit according to the embodiment of the present invention, as shown in fig. 6, the driving circuit 20 further includes a second isolation circuit 24, and the second isolation circuit 24 is electrically connected between the output end of the push-pull circuit 22 and the control electrodes of the first MOS transistor M1 and the second MOS transistor M2.
Specifically, the driving circuit may further include a push-pull circuit 22 and a second isolation circuit 24, so that the second isolation circuit 24 is electrically connected between the output end of the push-pull circuit 22 and the control electrodes of the first MOS transistor M1 and the second MOS transistor M2, and is configured to unidirectionally transmit the driving signal provided by the push-pull circuit 22 to the gates of the first MOS transistor M1 and the second MOS transistor M2, so as to drive the first MOS transistor M1 and the second MOS transistor M2 to be turned on or off.
Optionally, referring to fig. 6, the second isolation circuit 24 includes a second transformer 241, a first end g of the primary winding in the second transformer 241 is electrically connected to the second poles of the third transistor T3 and the fourth transistor T4, a second end h of the primary winding in the second transformer 241 floats to ground, a third end i of the secondary winding in the second transformer 241 is electrically connected to the control poles of the first MOS transistor M1 and the second MOS transistor M2, and a fourth end j of the secondary winding in the second transformer 241 is electrically connected to the second poles of the first MOS transistor M1 and the second MOS transistor M2.
Specifically, the first end g of the main coil in the second transformer 241 and the third end i of the secondary coil may be set to be the same-name end, so when the third transistor T3 in the push-pull circuit 22 is turned on, the amplified second power signal may be unidirectionally transmitted to the gates of the first MOS transistor M1 and the second MOS transistor M2 to control the first MOS transistor M1 and the second MOS transistor M2 to be turned on, where the second end h of the main coil in the second transformer 241 floats to ground, and may be electrically connected to the fifth end e of the secondary coil in the first transformer 11, and the sources of the first MOS transistor M1 and the second MOS transistor M2 may be electrically connected to the fourth end j of the secondary coil in the second transformer 241, so that when the first MOS transistor M1 and the second MOS transistor M2 are controlled to be turned on, the electric potential of the sources of the first MOS transistor M1 and the second MOS transistor M2 is lower than the electric potential of the gates. The second isolation circuit 24 may further include a sixth capacitor C6, where the sixth capacitor C6 is electrically connected between the fourth resistor R4 and the first end g of the main winding in the second transformer 241 for filtering. The number of turns of the primary winding and the number of turns of the secondary winding in the second transformer 241 may be set according to design requirements, and may be the same, for example.
The embodiment of the invention provides a further implementation mode of the switch control circuit, realizes isolation transmission of driving signals, and can protect the first MOS tube M1 and the second MOS tube from being damaged by impact of interference signals or impact voltage on the basis of stably driving the first MOS tube M1 and the second MOS tube M2 to be connected or disconnected.
Based on the same inventive concept, the embodiment of the present invention further provides a vehicle including the switch control circuit provided by any embodiment of the present invention, so that the vehicle provided by the embodiment of the present invention includes the technical features of the switch control circuit provided by any embodiment of the present invention, and can achieve the beneficial effects of the switch control circuit provided by the embodiment of the present invention, and the same points can be referred to the description of the switch control circuit provided by the embodiment of the present invention, which is not repeated herein.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. 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, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111659308.3A CN114337282B (en) | 2021-12-30 | 2021-12-30 | A vehicle and a switch control circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111659308.3A CN114337282B (en) | 2021-12-30 | 2021-12-30 | A vehicle and a switch control circuit thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114337282A CN114337282A (en) | 2022-04-12 |
| CN114337282B true CN114337282B (en) | 2024-12-13 |
Family
ID=81019497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111659308.3A Active CN114337282B (en) | 2021-12-30 | 2021-12-30 | A vehicle and a switch control circuit thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114337282B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109450418A (en) * | 2018-11-12 | 2019-03-08 | 成都法姆科技有限公司 | A kind of the IGBT isolated drive circuit and its control method of belt switch control unit |
| CN111293921A (en) * | 2019-12-30 | 2020-06-16 | 南京理工大学 | Adjustable RC (resistor-capacitor) micro pulse power supply based on three-way capacitor staggered discharge |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426397A (en) * | 2013-09-03 | 2015-03-18 | 中兴通讯股份有限公司 | Driving device and method for synchronous rectifier tube |
| US10312808B2 (en) * | 2015-11-04 | 2019-06-04 | Getac Technology Corporation | Power supply and power control method thereof |
| CN111641330B (en) * | 2020-06-29 | 2025-02-28 | 上海英恒电子有限公司 | A driving circuit and a motor controller |
| CN112688559A (en) * | 2020-12-17 | 2021-04-20 | 南京天之立科技有限公司 | Switching power supply circuit |
-
2021
- 2021-12-30 CN CN202111659308.3A patent/CN114337282B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109450418A (en) * | 2018-11-12 | 2019-03-08 | 成都法姆科技有限公司 | A kind of the IGBT isolated drive circuit and its control method of belt switch control unit |
| CN111293921A (en) * | 2019-12-30 | 2020-06-16 | 南京理工大学 | Adjustable RC (resistor-capacitor) micro pulse power supply based on three-way capacitor staggered discharge |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114337282A (en) | 2022-04-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100438283C (en) | High-side transistor driver for power converter | |
| CN103199677B (en) | Single channel isolated form MOSFET drive circuit | |
| CN102315759B (en) | There is raster data model controller circuitry and the power-up circuit thereof of anti saturation circuit | |
| US20180301296A1 (en) | Power switch module | |
| CN114337282B (en) | A vehicle and a switch control circuit thereof | |
| US8120264B2 (en) | Discharge lamp lighting circuit | |
| US7012816B2 (en) | Self-excited switching power supply circuit | |
| CN114465450A (en) | an isolated drive circuit | |
| CN110932240B (en) | Open circuit detection protection system for synchronous rectification switching power supply | |
| CN211508901U (en) | Power supply circuit and power supply device | |
| CN112564469B (en) | Switch converter and low-voltage starting circuit thereof | |
| CN220440557U (en) | SiC switching tube driving control circuit in switching power supply | |
| CN210898921U (en) | Power supply circuit | |
| CN109802573A (en) | A kind of current source PWM controller and Magnetic isolation feedback driving circuit and DC/DC converter based on it | |
| CN106714032A (en) | Electronic device with bootstrap capacitor charging circuit | |
| CN209860802U (en) | A resonant flyback power supply circuit, device and electronic equipment | |
| US20190036439A1 (en) | Current pulse transformer for isolating electrical signals | |
| JP2015050244A (en) | Led drive circuit | |
| CN109495092B (en) | Power switch tube driving circuit and driving method | |
| JP3469455B2 (en) | Switching power supply | |
| CN217063577U (en) | Double-tube flyback drive circuit and switching power supply | |
| EP3734839A1 (en) | A driving circuit and a desaturation circuit of a power circuit | |
| CN120222777A (en) | Driving circuit and power supply device | |
| CN222802739U (en) | Bootstrap driving circuit and switching power supply | |
| JP2015154682A (en) | Dc/dc converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |