CN215186498U - Vehicle-mounted inverter - Google Patents
Vehicle-mounted inverter Download PDFInfo
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- CN215186498U CN215186498U CN202120656843.2U CN202120656843U CN215186498U CN 215186498 U CN215186498 U CN 215186498U CN 202120656843 U CN202120656843 U CN 202120656843U CN 215186498 U CN215186498 U CN 215186498U
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- vehicle
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- switch
- mounted inverter
- mode choke
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Abstract
An in-vehicle inverter is provided which contributes to reducing the influence of noise from a vehicle control unit or the like on an operation unit for issuing an operation start command. The utility model discloses an on-vehicle dc-to-ac converter has control circuit and operation portion, wherein, control circuit has switch and operation processing apparatus, the switch connection external power source with between the operation processing apparatus, the operation portion with the switch is connected, and is right according to the operation that comes from the outside the break-make of switch is controlled, thereby right operation processing apparatus's circular telegram is controlled, the operation portion is connected with ground connection.
Description
Technical Field
The utility model relates to an on-vehicle dc-to-ac converter.
Background
In order to ensure stable operation of a power module such as an IGBT (insulated gate bipolar transistor), a capacitor is generally provided between a power supply and the power module in the vehicle-mounted inverter, and for example, as shown in fig. 2, a smoothing capacitor (smoothing capacitor) C1 and a filter capacitor (filter capacitor) C2 are generally provided between a power supply BT and a power module PM that drives a motor MT.
In order to prevent noise generated by switching operation of a power module such as an IGBT from being transmitted back to a power supply, a common mode choke coil for suppressing common mode noise, a capacitor for suppressing normal mode noise (so-called X capacitor), and a capacitor for suppressing common mode noise (so-called Y capacitor) may be provided between the power module and the power supply as disclosed in patent document 1.
Prior art documents:
patent document 1: japanese laid-open patent publication No. JP2020-156139A
In practice, in addition to noise generated when a power module such as an IGBT performs a switching operation, noise transmitted from a Vehicle Control Unit (VCU) may be present in the vehicle-mounted inverter, and this noise may affect the normal operation of an operation unit for issuing an operation start command, which is directly operated by an operator such as a driver, in the vehicle-mounted inverter.
SUMMERY OF THE UTILITY MODEL
The present invention has been made in view of the above problems, and an object of the present invention is to provide an on-vehicle inverter that contributes to reducing the influence of noise from a vehicle control unit or the like on an operation unit for issuing an operation start command.
In order to achieve the above object, the present invention provides an on-vehicle inverter having a control circuit and an operation unit, wherein the control circuit has a switch and an operation processing device, the switch is connected between an external power supply and the operation processing device, the operation unit is connected to the switch, and is right according to an operation from the outside the on-off of the switch is controlled, thereby right the energization of the operation processing device is controlled, and the operation unit is connected to the ground.
According to the present invention, since the operating unit that receives an operation from the outside to control the on/off state of the switch is connected to the ground, even if noise is transmitted from the vehicle control unit or the like to the vehicle-mounted inverter, the noise can be prevented from being transmitted to the operating unit and affecting the normal operation of the operating unit.
In the vehicle-mounted inverter according to the present invention, it is preferable that a capacitor and/or a normal mode choke coil be provided in the middle of a wire connecting the operating unit and the ground.
According to the present invention, since the capacitor and/or the normal mode choke coil are provided midway in the wiring connecting the operation unit and the ground, the noise transmitted to the ground can be effectively reduced by using the capacitor and the normal mode choke coil in combination.
In the vehicle-mounted inverter according to the present invention, it is preferable that the normal mode choke coil is provided in the middle of a wire connecting the operation unit and the switch.
In the vehicle-mounted inverter according to the present invention, it is preferable that a pi filter is connected between the operation unit and the ground, and the pi filter includes the capacitor and the normal mode choke coil.
According to the utility model discloses an on-vehicle dc-to-ac converter is connected with pi type filter between operation portion and ground connection, and pi type filter includes electric capacity and normal mode choke coil, consequently, can reduce the noise effectively.
In the vehicle-mounted inverter of the present invention, it is preferable that the capacitors are provided in parallel, and at least two of the capacitors have different capacities.
According to the utility model discloses an on-vehicle dc-to-ac converter, electric capacity is provided with a plurality ofly with parallelly connected mode, and two at least capacity differences in a plurality of electric capacities, consequently, can reduce the multiple noise of frequency difference, prevents the influence of noise more effectively.
In the vehicle-mounted inverter of the present invention, it is preferable that the external power supply is connected to the ground via a filter and a transient drop prevention capacitor.
According to the utility model discloses an on-vehicle dc-to-ac converter, external power source pass through the wave filter and prevent that the electric capacity falls in the twinkling of an eye and be connected with ground connection, consequently, when reducing the noise through the wave filter, can guarantee the stability of external power source to the power supply of arithmetic processing device through preventing the electric capacity that falls in the twinkling of an eye.
Further, in the vehicle-mounted inverter of the present invention, it is preferable that the filter includes one or more of a capacitor, a common mode choke coil, and a normal mode choke coil.
According to the utility model discloses an on-vehicle inverter, the wave filter includes one or more in electric capacity, common mode choke and normal mode choke, therefore, especially through using electric capacity, common mode choke and normal mode choke in combination, can effectively prevent that the noise (common mode noise, normal mode noise) from the outside from transmitting to external power source.
In the vehicle-mounted inverter according to the present invention, it is preferable that an anti-reverse diode is provided in a middle of a wire connecting the external power supply and the switch, and the anti-reverse diode prevents a reverse current from flowing from the switch side toward the external power supply.
In the vehicle-mounted inverter according to the present invention, it is preferable that a transistor and the switch are connected in series in a middle of a wire connecting the operation unit and the arithmetic processing unit.
In the vehicle-mounted inverter according to the present invention, it is preferable that the inverter further includes a power module including a power element, and the arithmetic processing unit controls a switching operation of the power element.
(effects of utility model)
According to the present invention, the operation unit that receives an operation from the outside to control the on/off of the switch is connected to the ground, and therefore, even if noise is transmitted from the vehicle control unit or the like to the vehicle-mounted inverter, the noise can be prevented from being transmitted to the operation unit and affecting the normal operation of the operation unit.
Drawings
Fig. 1 is a circuit diagram schematically showing an on-vehicle inverter according to an embodiment of the present invention.
Fig. 2 is a circuit diagram schematically showing an example of a conventional vehicle-mounted inverter.
(symbol description)
1 vehicle inverter
10 control circuit
11 switch
12 arithmetic processing device
13 transistor
14 diode
20 operating part
30 external power supply
40 to ground
50 power module
60 pi type filter
61 first capacitance
62 second capacitance
63 normal mode choke
70 filter
71 third capacitance
72 fourth capacitance
73 common mode choke
80 anti-instantaneous drop capacitor
91 anti-reverse diode
L1 wiring
L2 wiring
L3 wiring
Detailed Description
Next, a vehicle-mounted inverter according to an embodiment of the present invention will be described with reference to fig. 1.
(Structure of vehicle inverter)
As shown in fig. 1, the vehicle-mounted inverter 1 includes a control circuit 10 and an operation unit 20, wherein the control circuit 10 includes a switch 11 and an arithmetic processing device 12, the switch 11 is connected between an external power supply 30 and the arithmetic processing device 12, the operation unit 20 is connected to the switch 11, and controls on/off of the switch 11 in accordance with an operation from the outside to control energization of the arithmetic processing device 12, and the operation unit 20 is connected to a ground 40.
Here, as shown in fig. 1, the in-vehicle inverter 1 further includes a power module 50, the power module 50 includes power elements, and the arithmetic processing unit 12 controls switching operations (on/off operations) of the power elements so as to output necessary electric power to an object (not shown) such as a motor.
Further, the switch 11 is, for example, a P-channel FET; the arithmetic processing device 12 is, for example, a microcomputer; the operation unit 20 is, for example, an Ignition Switch (Ignition Switch) and issues an operation start command (for example, a vehicle start command) by directly receiving an operation from the outside (for example, an operation by a driver); the external power supply 30 is, for example, 12V; the grounding 40 is realized by, for example, a case of the vehicle inverter 1 or the like; the power module 50 is, for example, an IGBT module or a MOSFET module, and includes a plurality of power elements.
As shown in fig. 1, a pi filter 60 is connected between the operation unit 20 and the ground 40, and the pi filter 60 is composed of a first capacitor 61, a second capacitor 62, and a normal mode choke coil 63, wherein the first capacitor 61 (for example, 10 μ F) and the second capacitor 62 (for example, 1 μ F) are connected in parallel between the operation unit 20 and the ground 40, and the normal mode choke coil 63 is connected in series between the first capacitor 61 and the second capacitor 62. Specifically, the normal mode choke coil 63 is provided in the middle of a wiring L1 connecting the operation unit 20 and the switch 11, and the first capacitor 61 and the second capacitor 62 are connected in parallel between a wiring L1 and a wiring L2 extending from the ground 40.
As shown in fig. 1, the switch 11 and the transistor 13 are connected in series to a middle portion of a line L1 connecting the operation unit 20 and the arithmetic processing device 12. Specifically, the transistor 13 is located between the operation unit 20 and the switch 11, and the pi filter 60 is located between the operation unit 20 and the transistor 13.
As shown in fig. 1, a diode 14 is connected to a portion of a line L1 connecting the operation unit 20 and the arithmetic processing unit 12, and the diode 14 prevents a current from flowing backward from the switch 11 side to the operation unit 20. Specifically, the diode 14 is connected in series with the normal mode choke 63, and the diode 14 is located further from the operation unit 20 than the normal mode choke 63.
Further, as shown in fig. 1, the external power supply 30 is connected to the ground 40 through a filter 70 and a transient drop prevention capacitor 80 (i.e., a capacitor that prevents a transient drop in voltage). The filter 70 includes a third capacitor 71, a fourth capacitor 72, and a common mode choke coil 73, the third capacitor 71 (for example, 10 μ F) and the fourth capacitor 72 (for example, 2 μ F) are connected in parallel between the external power supply 30 and the ground 40, the common mode choke coil 73 is located between the third capacitor 71 and the fourth capacitor 72, and the fourth capacitor 72 is located farther from the external power supply 30 than the third capacitor 71. Further, the anti-transient-drop capacitor 80 is connected in parallel with the third capacitor 71 and the fourth capacitor 72 between the external power supply 30 and the ground 40, and the anti-transient-drop capacitor 80 is farther from the external power supply 30 than the fourth capacitor 72. Specifically, the third capacitor 71, the fourth capacitor 72, and the anti-snap-down capacitor 80 are connected in parallel between the wiring L2 and the wiring L3, and the wiring L3 connects the external power supply 30 to the switch 11.
As shown in fig. 1, an anti-reverse diode 91 is further provided in the middle of a wiring L3 connecting the external power supply 30 and the switch 11, and the anti-reverse diode 91 prevents a reverse current from the switch 11 side to the external power supply 30. Specifically, the anti-reverse diode 91 is located between the fourth capacitor 72 and the anti-snap-down capacitor 80.
(operation of vehicle inverter)
For example, when the driver of the vehicle operates the operation unit 20 to issue an operation start command, the transistor 13 is turned on to turn on the switch 11, so that the external power supply 10 supplies power to the arithmetic processing device 12, and the arithmetic processing device 12 controls the switching operation of the power element so as to output a required electric power to an object such as a motor not shown.
(main effect of the present embodiment)
According to the in-vehicle inverter 1 of the present embodiment, the operating unit 20 that receives an operation from the outside to control the on/off of the switch 11 is connected to the ground 40, and therefore, even if noise is transmitted from the vehicle control unit or the like to the in-vehicle inverter 1, the noise is prevented from being transmitted to the operating unit 20 and affecting the normal operation of the operating unit 20.
The present invention has been described above by way of example with reference to the accompanying drawings, and it is to be understood that the specific implementations of the present invention are not limited to the above-described embodiments.
For example, in the above embodiment, the capacities of the first capacitor 61, the second capacitor 62, the third capacitor 71, and the fourth capacitor 72 are not limited, and may be set as appropriate as needed.
In the above-described embodiment, the pi filter 60 is connected between the operation unit 20 and the ground 40, and the pi filter 60 is configured by the first capacitor 61, the second capacitor 62, and the normal mode choke coil 63, but the present invention is not limited to this, and the first capacitor 61 and the second capacitor 62 may be replaced by a plurality of capacitors connected in parallel, respectively (in this case, it is preferable that at least two of the plurality of capacitors have different capacities), the normal mode choke coil 63 may be omitted, or the normal mode choke coil 63 and the first capacitor 61 (or the second capacitor 62) may be omitted.
In the above embodiment, the diode 14 is further connected to the middle of the wiring L1 connecting the operation unit 20 and the arithmetic processing device 12, but the present invention is not limited to this, and the diode 14 may be omitted.
In the above-described embodiment, the filter 70 includes the third capacitor 71, the fourth capacitor 72, and the common mode choke coil 73, but the present invention is not limited to this, and the third capacitor 71 and the fourth capacitor 72 may be replaced by a plurality of capacitors connected in parallel, respectively (in this case, it is preferable that at least two of the plurality of capacitors have different capacities), the common mode choke coil 73 may be omitted, or the common mode choke coil 73 and the third capacitor 71 (or the fourth capacitor 72) may be omitted.
Further, in the above embodiment, the filter 70 may further include a normal mode choke coil.
In the above embodiment, one anti-transient-drop capacitor 80 is provided, but the present invention is not limited to this, and a plurality of anti-transient-drop capacitors 80 may be provided in parallel.
In addition, in the above embodiment, another filtering structure may be further provided between the filter 70 and the reverse connection preventing diode 91.
It should be understood that the present invention can freely combine the respective components in the embodiments or appropriately change or omit the respective components in the embodiments within the scope thereof.
Claims (10)
1. A vehicle-mounted inverter having a control circuit and an operation unit,
the control circuit has a switch and an arithmetic processing device, the switch is connected between an external power supply and the arithmetic processing device,
the operation unit is connected to the switch and controls the on/off of the switch in accordance with an operation from the outside to control the energization of the arithmetic processing unit,
the operation portion is connected to ground.
2. The vehicle-mounted inverter of claim 1,
a capacitor and/or a normal mode choke coil is provided in the middle of a wiring connecting the operation section and the ground.
3. The vehicle-mounted inverter of claim 2,
the normal mode choke coil is provided in the middle of a wiring connecting the operation unit and the switch.
4. The vehicle-mounted inverter of claim 3,
a pi-type filter is connected between the operation unit and the ground,
the pi-type filter includes the capacitor and the normal mode choke coil.
5. The vehicle-mounted inverter of claim 2,
the capacitor is provided in parallel with a plurality of capacitors, and at least two of the capacitors have different capacities.
6. The vehicle-mounted inverter of claim 1,
the external power supply is connected to the ground through a filter and an anti-transient drop capacitor.
7. The vehicle-mounted inverter of claim 6,
the filter includes one or more of a capacitor, a common mode choke, and a normal mode choke.
8. The vehicle-mounted inverter of claim 1,
an anti-reverse diode is provided midway in a wiring connecting the external power supply and the switch,
the reverse connection preventing diode prevents a reverse current from the switch side toward the external power source.
9. The vehicle-mounted inverter of claim 1,
a transistor and the switch are connected in series in a middle of a wire connecting the operation unit and the arithmetic processing unit.
10. The vehicle-mounted inverter of claim 1,
also provided is a power module having a power element,
the arithmetic processing device controls switching operation of the power element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120656843.2U CN215186498U (en) | 2021-03-31 | 2021-03-31 | Vehicle-mounted inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120656843.2U CN215186498U (en) | 2021-03-31 | 2021-03-31 | Vehicle-mounted inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215186498U true CN215186498U (en) | 2021-12-14 |
Family
ID=79354568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120656843.2U Active CN215186498U (en) | 2021-03-31 | 2021-03-31 | Vehicle-mounted inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215186498U (en) |
-
2021
- 2021-03-31 CN CN202120656843.2U patent/CN215186498U/en active Active
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