CN112737298A - High-pressure relief device and method - Google Patents
High-pressure relief device and method Download PDFInfo
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- CN112737298A CN112737298A CN202011591915.6A CN202011591915A CN112737298A CN 112737298 A CN112737298 A CN 112737298A CN 202011591915 A CN202011591915 A CN 202011591915A CN 112737298 A CN112737298 A CN 112737298A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 28
- 238000007599 discharging Methods 0.000 claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims description 32
- 238000004891 communication Methods 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 abstract description 7
- 238000001816 cooling Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
Abstract
The invention provides a high-voltage discharge device and a high-voltage discharge method, which are provided with a detection circuit, wherein the detection circuit is used for detecting peak current in a discharge circuit and feeding back the peak current to a control unit, and the control unit can send a PWM pulse width adjusting instruction to the discharge circuit according to received peak current information so as to control the peak current. It is thereby possible to control and limit the magnitude of the peak current flowing through the electronic device at each PWM period. The electrical control framework provided by the invention is suitable for the active discharge of high voltage of inverters of various power device types, and can effectively reduce the system cost of the discharge function of the inverters. The reliability and controllability of the active discharging function can be effectively improved, the reliability of the active discharging function of the permanent magnet synchronous motor is guaranteed when the permanent magnet synchronous motor enters the ASC safety mode, and the life cycle of the system is not reduced.
Description
Technical Field
The invention belongs to the technical field of electric automobiles, and particularly relates to a high-pressure relief device and a method.
Background
Before the vehicle stops, the vehicle driving motor controller needs to receive a power-off signal from the vehicle controller and then discharge energy stored in a high-voltage direct-current side capacitor. From the view point of the function safety of the whole vehicle, in order to ensure the high-voltage safety, the discharge of the energy on the high-voltage battery must ensure the perfect reliability. Currently, there are two main methods: firstly, the discharge of the energy is mostly realized by adopting resistors connected in parallel at two ends of a high-voltage direct-current side; second, if the integrated motor controller is integrated with a DC/DC device, the DC side voltage is bled off by operating the DC/DC in a buck supply mode before power down. However, both methods have certain drawbacks, the problem of bleeding through the resistance being: the resistor leakage energy is actually consumed by heat loss of converting electric energy into the resistor, and the heat dissipation and cooling design of the resistor must be considered in the hardware design, so that the additional cost of the system is increased. And the problem of discharging high voltage direct current by DC/DC is that: if the motor controller is not provided with an integrated DC/DC device, the discharge of energy on the high-voltage direct current capacitor cannot be realized. In addition, since the discharge process is long, the long-time discharge process may cause the corresponding electronic device to operate in a saturation region for a long time, so that the current flowing through the electronic device is increased sharply, resulting in a risk of thermal failure of the electronic device. The two high pressure relief modes are shown in fig. 1 and 2.
Therefore, there is a need to provide a high pressure relief device that addresses the risk of thermal failure of the electronic device.
Disclosure of Invention
The invention aims to provide a high-pressure relief device and a high-pressure relief method, which are used for solving the problem of thermal failure risk of electronic devices in the prior art.
In order to solve the above technical problem, a first aspect of the present invention provides a high-voltage relief device, including a discharge circuit, a detection circuit, and a control unit;
the detection circuit is connected with the discharge circuit in parallel and is in communication connection with the control unit;
the discharging circuit works in a PWM mode, and is connected with a high-voltage power supply and used for discharging the high-voltage power supply;
the detection circuit is used for detecting the peak current in the discharge circuit and feeding back the peak current to the control unit, and the control unit sends a PWM pulse width adjusting instruction to the discharge circuit according to the received peak current information so as to control the peak current.
Optionally, the detection circuit includes an energy charging capacitor, the discharge circuit charges the energy charging capacitor during a discharge process, and the peak current is obtained according to a voltage of the energy charging capacitor.
Optionally, the detection circuit further includes a first resistor, a second resistor, a third resistor, a first capacitor, and a first diode;
the first capacitor, the first diode, the second resistor, the third resistor and the control unit are sequentially connected in series and are connected with the discharge circuit in parallel, the first resistor is connected between the first capacitor and the first diode in parallel, and the energy charging capacitor is connected between the second resistor and the third resistor in parallel;
one end of the third resistor connected with the control unit is used for feeding back the peak current to the control unit.
Optionally, a reset unit is connected in parallel between the second resistor and the third resistor, and the reset unit is configured to discharge the energy charging capacitor to reset a voltage value thereof.
Optionally, the reset unit includes a reset switch and a fourth resistor, and the reset switch and the fourth resistor are connected in series and connected in parallel between the second resistor and the third resistor.
Optionally, the discharge circuit includes a first power component and a second power component;
the first power component and the second power component form a U-phase bridge arm circuit, and the detection circuit is connected with the U-phase bridge arm circuit in parallel and is in communication connection with the control unit;
the first power component operates in a PWM mode for discharging the high voltage power supply, and the second power component operates in an on mode.
Optionally, the first power component and the second power component are IGBTs or MOS transistors.
Optionally, the control unit is a CPLD.
Optionally, the control unit is an MCU.
A second aspect of the present invention provides a high pressure relief method, employing any of the above features, comprising the steps of,
s1: the detection circuit collects peak current information from the discharge circuit and feeds the peak current information back to the control unit;
s2: the control unit sends an instruction for adjusting the PWM pulse width of the discharge circuit to the discharge circuit according to the peak current information, and returns to step S1.
The invention provides a high-voltage discharge device and a high-voltage discharge method, which are provided with a detection circuit, wherein the detection circuit is used for detecting peak current in a discharge circuit and feeding back the peak current to a control unit, and the control unit can send a PWM pulse width adjusting instruction to the discharge circuit according to received peak current information so as to control the peak current. It is thereby possible to control and limit the magnitude of the peak current flowing through the electronic device at each PWM period. The electrical control framework provided by the invention is suitable for the active discharge of high voltage of inverters of various power device types, and can effectively reduce the system cost of the discharge function of the inverters. The reliability and controllability of the active discharging function can be effectively improved, the reliability of the active discharging function of the permanent magnet synchronous motor is guaranteed when the permanent magnet synchronous motor enters an ASC (automatic stability control) safety mode, and the life cycle of the system is not reduced.
Drawings
FIG. 1 is a schematic view of a high pressure relief device of the prior art;
FIG. 2 is a schematic view of another high pressure relief device of the prior art;
fig. 3 is a schematic view of a high pressure relief device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the circuit of FIG. 3;
FIG. 5 is a schematic view of another high pressure relief device provided in accordance with one embodiment of the present invention;
fig. 6 is a schematic flow chart of a high-pressure relief method according to a second embodiment of the present invention;
10-discharge circuit, 101-first power component, 102-second power component, 20-detection circuit, 201-charging capacitor, 202-first resistor, 203-second resistor, 204-third resistor, 205-first capacitor, 206-first diode, 207-reset unit, 30-control unit.
Detailed Description
The high pressure relief device and method according to the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Example one
As shown in fig. 3 and 4, a high-voltage relief device according to an embodiment of the present invention includes a discharge circuit 10, a detection circuit 20, and a control unit 30. The detection circuit 20 is connected in parallel with the discharge circuit 10 and is in communication connection with the control unit 30, the discharge circuit 10 operates in a PWM mode, and the discharge circuit 10 is connected to a high voltage power supply and is configured to discharge the high voltage power supply. The detection circuit 20 is configured to detect a peak current in the discharge circuit 10 and feed back the peak current to the control unit 30, and the control unit 30 sends an instruction for adjusting a PWM pulse width to the discharge circuit 10 according to the received peak current information to control the peak current.
The device can be used for the active discharge of high voltage of inverters of various power device types in new energy vehicles, and the discharge process of the motor controller can be exemplified in the embodiment. When the motor controller receives a discharge command from the vehicle controller, the discharge circuit 10 operates in the PWM mode, the discharge circuit 10 starts to discharge, and the detection circuit 20 collects a peak current from the discharge circuit 10 in each PWM period. The control unit 30 determines the pulse width of the next PWM period according to the peak current information, and further controls the peak current of the discharge circuit 10 in the next PWM period in turn. For example, if the peak current of the current cycle is detected to be too large, the control unit 30 may decrease the pulse width of the PWM signal in a suitable range in the next cycle to decrease the peak current. Of course, the judgment range and the selection of the PWM pulse width are determined by calculation. Control and clipping of the magnitude of the peak current flowing through the electronic device is achieved at each PWM period. It should be noted that the control unit 30 may be various MCUs, or may be a CPLD, and may also be implemented by a DSP, which is not limited herein.
Optionally, the detection circuit 20 includes a charging capacitor 201, as shown in fig. 4, the discharging process of the discharging circuit 10 is performed by charging the charging capacitor 201, and the peak current is obtained by the voltage of the charging capacitor 201. The inventors have found that when the discharge circuit 10 is operating in the discharge state, the two terminals of the charge capacitor 201 are charged to a certain corresponding amplitude. The peak current of the discharge circuit 10 and the voltage value of the charge capacitor 201 have a proportional relationship, and the magnitude of the peak current of the discharge circuit can be reversely deduced from the magnitude of the voltage of the charge capacitor 201.
Optionally, the detection circuit 20 further includes a first resistor 202, a second resistor 203, a third resistor 204, a first capacitor 205, and a first diode 206. The first capacitor 205, the first diode 206, the second resistor 203, the third resistor 204 and the control unit 30 are sequentially connected in series and connected in parallel with the discharge circuit 10, the first resistor 202 is connected in parallel between the first capacitor 205 and the first diode 206, and the charging capacitor 201 is connected in parallel between the second resistor 203 and the third resistor 204. One end of the third resistor 204 connected to the control unit 30 is used for feeding back the peak current to the control unit 30.
Optionally, a reset unit 207 is connected in parallel between the second resistor 203 and the third resistor 204, and the reset unit 207 is configured to discharge the energy charging capacitor 201 to reset the voltage value thereof.
Optionally, the reset unit 207 includes a reset switch and a fourth resistor, and the reset switch and the fourth resistor are connected in series and in parallel between the second resistor 203 and the third resistor 204.
Optionally, the discharge circuit 10 includes a first power component 101 and a second power component 102. The first power component 101 and the second power component 102 form a U-phase bridge arm circuit, and the detection circuit 20 is connected in parallel with the U-phase bridge arm circuit and is in communication connection with the control unit 30. The first power part 101 operates in a PWM mode for discharging the high voltage power supply, and the second power part 102 operates in an on mode.
Optionally, the first power component 101 and the second power component 102 may be IGBTs or MOS transistors, and of course, may also be other power components, which is not limited herein.
The high-voltage discharge device provided by the embodiment of the invention can effectively improve the reliability and controllability of the active discharge function, ensure that the permanent magnet synchronous motor can realize the reliability of the active discharge function when entering the safety mode of the ASC, and does not reduce the life cycle of the system.
The inventor also finds that active discharge can be realized by using a self-contained U-phase bridge arm of the motor controller, and as shown in fig. 5, a U-phase upper tube works in a PWM mode, and a U-phase lower tube works in an opening mode. When the motor controller receives a discharge command, the U-phase tube IGBT works in a pulse discharge mode until the voltage of the high-voltage side direct-current capacitor drops below 60V allowed by regulations. Although the IGBT can generate heat loss in discharging, the IGBT module and the liquid cooling plate are integrated together to automatically help the IGBT to realize cooling, so that the discharging method does not add extra hardware design for motor control, and is a low-cost high-voltage discharge mode.
Example two
The second embodiment of the present invention provides a high pressure relief method, which, with the apparatus provided in the first embodiment, as shown in fig. 6, includes the following steps,
the first step is as follows: the detection circuit collects peak current information from the discharge circuit and feeds the peak current information back to the control unit;
the second step is that: and the control unit sends an instruction for adjusting the PWM pulse width of the discharge circuit to the discharge circuit according to the peak current information and returns to the first step.
In order to realize the control and the amplitude limiting of the peak current of the discharge circuit during discharging, the inventor finds in experiments that the pulse current of the discharge circuit can be divided into several areas. The minimum and maximum values of the target control current are defined as two values i2 and i 3. i4 is the maximum value of the peak current that is not allowed to exceed, i1 is the predefined threshold value of smaller peak current, and when the peak current value calculated by software is smaller than i1, the corresponding PWM pulse width increases by a large step.
As shown in table 1, a dynamic adjustment strategy of PWM pulses in the current peak mode is given, where i is the peak current of the discharge circuit in the current period, P is the PWM pulse width in the current period, P1 is the large step pulse width, P2 is the small step pulse width, and the right side of table 1 represents the adjustment made to the pulse width in the next PWM period. When the current peak value calculated by software is smaller than i1, the PWM pulse width is increased by a large step; when the peak current of the IGBT is smaller than i2, the PWM pulse width is increased in small steps; when the peak current of the discharge circuit exceeds i3, the PWM pulse width is reduced by small steps; once the peak current is calculated to exceed i4, the PWM pulse width is reduced to zero. According to the method, the control and the amplitude limiting of the peak current of the discharge circuit can be finally realized.
TABLE 1 PWM pulse Width adjustment strategy
In summary, the present invention provides a high voltage relief apparatus and method, wherein a detection circuit is provided, the detection circuit is configured to detect a peak current in a discharge circuit and feed back the peak current to a control unit, and the control unit can send a PWM pulse width adjustment command to the discharge circuit according to received peak current information to control the peak current. It is thereby possible to control and limit the magnitude of the peak current flowing through the electronic device at each PWM period. The electrical control framework provided by the invention is suitable for the active discharge of high voltage of inverters of various power device types, and can effectively reduce the system cost of the discharge function of the inverters. The reliability and controllability of the active discharging function can be effectively improved, the reliability of the active discharging function of the permanent magnet synchronous motor is guaranteed when the permanent magnet synchronous motor enters the ASC safety mode, and the life cycle of the system is not reduced.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example" or "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. And the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. A high-voltage relief device is characterized by comprising a discharge circuit, a detection circuit and a control unit;
the detection circuit is connected with the discharge circuit in parallel and is in communication connection with the control unit;
the discharging circuit works in a PWM mode, and is connected with a high-voltage power supply and used for discharging the high-voltage power supply;
the detection circuit is used for detecting the peak current in the discharge circuit and feeding back the peak current to the control unit, and the control unit sends a PWM pulse width adjusting instruction to the discharge circuit according to the received peak current information so as to control the peak current.
2. A high pressure relief device as claimed in claim 1, wherein said sensing circuit includes a charging capacitor, and said discharge circuit performs a discharge process by charging said charging capacitor, and said peak current is derived from the magnitude of the voltage across said charging capacitor.
3. The high pressure relief device according to claim 2, wherein said detection circuit further comprises a first resistor, a second resistor, a third resistor, a first capacitor, a first diode;
the first capacitor, the first diode, the second resistor, the third resistor and the control unit are sequentially connected in series and are connected with the discharge circuit in parallel, the first resistor is connected between the first capacitor and the first diode in parallel, and the energy charging capacitor is connected between the second resistor and the third resistor in parallel;
one end of the third resistor connected with the control unit is used for feeding back the peak current to the control unit.
4. A high-voltage bleeder device as claimed in claim 3, wherein a reset unit is connected in parallel between said second resistor and said third resistor, said reset unit being adapted to discharge said charging capacitor to reset the voltage value thereof.
5. The high pressure relief device according to claim 4, wherein the reset unit includes a reset switch and a fourth resistor, the reset switch being connected in series with the fourth resistor and connected in parallel between the second resistor and the third resistor.
6. The high pressure relief device of claim 1, wherein said discharge circuit includes a first power component and a second power component;
the first power component and the second power component form a U-phase bridge arm circuit, and the detection circuit is connected with the U-phase bridge arm circuit in parallel and is in communication connection with the control unit;
the first power component operates in a PWM mode for discharging the high voltage power supply, and the second power component operates in an on mode.
7. The high pressure relief device of claim 6, wherein the first power component and the second power component are IGBTs, or MOS transistors.
8. A high pressure relief device, according to claim 1, wherein said control unit is a CPLD.
9. A high pressure relief device according to claim 1, wherein said control unit is a MCU.
10. A high pressure relief method using any one of the high pressure relief devices of claims 1-9, comprising the steps of,
s1: the detection circuit collects peak current information from the discharge circuit and feeds the peak current information back to the control unit;
s2: the control unit sends an instruction for adjusting the PWM pulse width of the discharge circuit to the discharge circuit according to the peak current information, and returns to step S1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011591915.6A CN112737298A (en) | 2020-12-29 | 2020-12-29 | High-pressure relief device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011591915.6A CN112737298A (en) | 2020-12-29 | 2020-12-29 | High-pressure relief device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114355143A (en) * | 2022-01-05 | 2022-04-15 | 中节能风力发电股份有限公司 | Energy discharge and inhibition device and method for IGBT characteristic test equipment |
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| US20110096445A1 (en) * | 2009-10-28 | 2011-04-28 | Texas Instruments Incorporated | Surge Current Detection In A Switch By Detecting Change In A duty Cycle |
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