CN111913129A - Power-on self-test detection circuit and method - Google Patents
Power-on self-test detection circuit and method Download PDFInfo
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- CN111913129A CN111913129A CN202010870944.XA CN202010870944A CN111913129A CN 111913129 A CN111913129 A CN 111913129A CN 202010870944 A CN202010870944 A CN 202010870944A CN 111913129 A CN111913129 A CN 111913129A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/56—Testing of electric apparatus
Abstract
The invention discloses a power-on self-test detection circuit and a method, comprising the following steps: the system comprises a first voltage source, a voltage conversion device, a processor and a bus capable of supplying power to a power circuit, wherein the power circuit comprises at least two power electronic devices; the first voltage source is connected with the bus through the voltage conversion device, the voltage conversion device is used for converting first voltage output by the first voltage source into pre-charging voltage to supply power to the bus, the pre-charging voltage is not lower than the preset proportion of second voltage, and the second voltage is working voltage of the power circuit; the power circuit is connected with the first voltage source through the processor, and the processor is used for controlling the on and off of the power electronic device and detecting the output voltage value of the first voltage source; when the power circuit has short-circuit fault, the output voltage value is less than or equal to the preset voltage threshold value, and the short-circuit current value flowing through the power circuit is less than or equal to the preset current threshold value. The self-checking circuit can effectively improve the reliability of circuit self-checking on the basis of realizing the pre-charging of the high-voltage capacitor.
Description
Technical Field
The invention relates to the field of fuel cells, in particular to a power-on self-test detection circuit and a power-on self-test detection method for the same.
Background
With the continuous development of the fuel cell field, the hydrogen fuel cell system has been widely applied to modern electric vehicles due to the characteristics of high energy conversion rate, stable operation, low noise and the like, and the air compressor which is a key component in the hydrogen fuel cell system plays an important role in the stable operation of the hydrogen fuel cell system.
The conventional air compressor controller inevitably causes system failure due to abnormal conditions during operation, and therefore needs to detect whether a circuit has a failure before the upper high voltage, particularly whether an Insulated Gate Bipolar Transistor (IGBT) in the controller has a short circuit phenomenon, while the conventional failure detection method is generally based on a diode detection method, such as a patent with application number 201920815804.5, which proposes to detect the controller circuit by arranging a diode between a high voltage loop and a low voltage loop and utilizing the effect of forward conduction and reverse cut, but the detection method still has the following disadvantages:
1. the diode has no isolation function, and when the diode breaks down or is short-circuited, a high-voltage loop is possibly connected into a low-voltage loop, so that the control chip and the control board are in failure;
2. at the moment of the self-checking of the circuit, the current of the power supply for charging the capacitor is large, and the voltage of the battery is very likely to be reduced, so that the single chip microcomputer gives false alarm;
3. after the self-checking of the circuit is finished, the high-voltage bus needs to be pre-charged, and the time consumption is long.
Disclosure of Invention
Aiming at the defects of the prior art, the application provides the power-on self-test detection circuit and the power-on self-test detection method, which are used for improving the reliability of circuit self-test.
In a first aspect, the present application provides a power-on self-test detection circuit, the circuit comprising: -a first voltage source (1), -a voltage conversion means (2), -a processor (3) and-a bus bar (8) that can supply power to a power circuit (7), said power circuit (7) comprising at least two power electronics;
the first voltage source (1) is connected with the bus (8) through the voltage conversion device (2), the voltage conversion device (2) is used for converting a first voltage output by the first voltage source (1) into a pre-charging voltage to supply power to the bus (8), the pre-charging voltage is not lower than a preset proportion of a second voltage, and the second voltage is an operating voltage of the power circuit (7);
the power circuit (7) is connected with the first voltage source (1) through the processor (3), and the processor (3) is used for controlling the power electronic device to be switched on and off and detecting the output voltage value of the first voltage source (1); when the power circuit (7) has a short-circuit fault, the output voltage value is smaller than or equal to a preset voltage threshold value, and the short-circuit current value flowing through the power circuit (7) is smaller than or equal to a preset current threshold value.
In some embodiments, the circuit further comprises a pre-charge circuit through which the first voltage source (1) is connected to the bus bar (8), the pre-charge circuit comprising a first circuit formed by a first switching element (41) and an impedance element (5) in series.
In some embodiments, the pre-charge loop further comprises a second circuit in parallel with the first circuit, the second circuit comprising a second switching element (42).
In some embodiments, the voltage conversion device (2) is an isolated boost device.
In some embodiments, the first switching element (41) and/or the second switching element (42) is configured as a controllable switching element or as an uncontrollable switching element.
In a second aspect, the present application further provides an air compressor controller, where the air compressor controller includes any one of the above-described power-on self-test detection circuits.
In a third aspect, the present application also provides a hydrogen fuel cell system including the air compressor controller as described above.
In a fourth aspect, the present application further provides a power-on self-test detection method, which is used for a power-on self-test detection circuit, where the power-on self-test detection circuit is the power-on self-test detection circuit described above, and the power-on self-test detection circuit:
acquiring the bus voltage of the power-on self-detection circuit;
if the bus voltage reaches a pre-charging voltage, controlling a power electronic device in the power circuit to be switched on, wherein the pre-charging voltage is obtained by converting a first voltage output by the voltage converting device to the first voltage source;
detecting an output voltage value of the first voltage source based on the turned-on power electronic device;
and if the output voltage value is less than or equal to a preset voltage threshold value within a first preset time, judging that the power circuit is in fault.
In some embodiments, prior to said obtaining the bus voltage of the bus, the method further comprises: determining whether the power-on self-test detection circuit meets a preset charging trigger condition; generating a charging instruction under the condition that the power-on self-detection circuit meets the charging trigger condition; and sending the charging instruction to a controllable switching element in the power-on self-test detection circuit, wherein the pre-charging instruction is used for indicating the controllable switching element to be switched on or switched off so that the first voltage source supplies power to the bus through the voltage conversion device until the bus voltage of the bus reaches the pre-charging voltage.
In some embodiments, the controllable switching element comprises a first contact switch and/or a second contact switch, the charging command is a first charging command or a second charging command, the first charging command is used for indicating that the first contact switch is closed, the second charging command is used for indicating that the first contact switch is closed and the second contact switch is open, and after the bus voltage reaches a limited charging voltage, indicating that the second contact switch is closed and the first contact switch is open.
In some embodiments, a fault detection command is generated if the bus voltage reaches a pre-charge voltage; and sending the fault detection instruction to the driving unit, wherein the fault detection instruction is used for indicating the driving unit to sequentially turn on the power electronic devices in the power circuit.
In some embodiments, the power-on self-test detection circuit includes a second voltage source and an active switching element, and after the detecting the value of the output voltage of the first voltage source based on the turned-on power electronics, the method further includes: if the output voltage value is greater than the preset voltage threshold value within first preset time, generating a control instruction; sending the control instruction to the active switching element, wherein the first control instruction is used for indicating the active switching element to be closed so as to supply power to the bus by the second voltage source when the active switching element is closed.
The application provides a power-on self-checking detection circuit, the first voltage through the conversion first voltage source output is the generating line power supply, can realize circuit self-checking after the break-make of power electronic device in the control power circuit, can effectively promote the reliability of circuit self-checking.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a power-on self-test detection circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another power-on self-test detection circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic flow chart of a power-on self-test detection method provided in the embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered 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, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
As shown in fig. 1, in one embodiment, the present application provides a power-on self-test detection circuit, comprising: the system comprises a first voltage source (1), a voltage conversion device (2), a processor (3) and a bus (8) which can supply power to a power circuit (7), wherein the power circuit (7) comprises at least two power electronic devices;
the first voltage source (1) is connected with the bus (8) through the voltage conversion device (2), the voltage conversion device (2) is used for converting a first voltage output by the first voltage source (1) into a pre-charging voltage to supply power to the bus (8), the pre-charging voltage is not lower than a preset proportion of a second voltage, and the second voltage is a working voltage of the power circuit (7); the power circuit (7) is connected with the first voltage source (1) through the processor (3), and the processor (3) is used for controlling the on and off of the power electronic device and detecting the output voltage value of the first voltage source (1); when the power circuit (7) has a short-circuit fault, the output voltage value is smaller than or equal to the preset voltage threshold value, and the short-circuit current value flowing through the power circuit (7) is smaller than or equal to the preset current threshold value.
Specifically, the power electronic device is an IGBT transistor, and the power electronic device shown in fig. 1 includes 6 IGBT transistors Q1, Q2, Q3, Q4, Q5, and Q6. An IGBT Transistor is a composite fully-controlled voltage-driven power Semiconductor device consisting of Bipolar Junction Transistors (BJTs) and insulated gate Field Effect transistors (MOS), has the advantages of high input impedance of Metal-Oxide-Semiconductor Field Effect transistors (MOSFETs) and low conduction voltage drop of electronic transistors (Giant transistors, GTRs), is very suitable for being applied to the fields of direct-current conversion systems with the direct-current voltage of 600V and above, such as alternating-current motors, permanent magnet synchronous motors, frequency converters, switching power supplies, lighting circuits, traction transmission and the like, and can reduce current fluctuation and torque ripple by applying a three-phase inverter circuit consisting of IGBT insulated gate Bipolar transistors. The power module (7) is a three-phase inverter circuit, the three-phase inverter circuit is integrated with at least two power electronic devices, and the power module (7) is provided with three connecting ends after the power electronic devices are integrated. The first connecting end of the power module (7) is connected with the bus (8), the second connecting end of the power module (7) is connected with the processor (3) through the driving unit (6), and the third connecting end of the power module (7) is grounded.
More specifically, the Processor (3) includes at least one of a Central Processing Unit (CPU), an Electronic Control Unit (ECU), a Micro Control Unit (MCU), a Memory Protection Unit (MPU), and an integrated circuit Chip (System-on-a-Chip, SOC). It is understood that in other embodiments, the processor (3) may be other processors that meet circuit requirements, and the processor (3) is not particularly limited in this application. The driving unit (6) is a unit module used for driving the power electronic period in the power module (7), and the driving unit (6) can also be at least one of a central processing unit, an electronic control unit, a micro control unit, a memory protection unit and an integrated circuit chip. The bus bar (8) is a common passage to which a plurality of devices are connected in parallel branches. The voltage conversion device (2) is a boosting device, and the first voltage output by the first voltage source (1) is 12V-32V.
Further, the second voltage is an operating voltage of the power circuit (7), the operating voltage in the embodiment of the present application may be a voltage of 500V (in other embodiments, may be 400V to 750V), and when the preset ratio is 70%, the precharge voltage is 350V to 500V. If the actual pre-charging voltage has an upper pre-threshold value, if the pre-charging voltage is not lower than a first preset proportion of the second voltage and not higher than a second preset proportion of the second voltage, when the first preset proportion is 10% and the second preset proportion is 80%, the pre-charging voltage is 100V-400V, and the pre-charging voltage lower than the working voltage is adopted to supply power to the bus, so that the pre-charging function of the high-voltage capacitor can be realized while the self-detection of the circuit is completed, and a pre-charging loop of the high-voltage bus in the original circuit can be omitted. It is understood that the predetermined ratio can be set according to the actual application requirement, and if the current power needed to supply the bus (8) is more than 70% of the actual required power, the predetermined ratio can be set to 70%.
Furthermore, the circuit can also realize the self-checking function, namely the processor (3) can control the on and off of the power electronic devices in the power module (7) and detect the output voltage value of the first voltage source (1) in real time to realize the fault detection of the three-phase inverter circuit, the principle is that as the power electronic devices are controlled by the processor (3) to be started one by one, if one of the power electronic devices has a fault, the starting of the tube pair device can cause the instantaneous through of a bridge arm, namely the first voltage source (1) can be triggered to provide larger current, but as the power of the first voltage source (1) is smaller and the power supply capacity is limited, the output voltage of the first voltage source (1) can be pulled to an undervoltage threshold value, namely the output voltage value of the first voltage source (1) is smaller than or equal to a preset voltage threshold value, and the short-circuit current value flowing through the power circuit (7) is smaller than or equal to the preset current threshold value, at the moment, the processor (3) can not only realize circuit self-detection by detecting the output voltage of the first voltage source (1), but also detect and position specific fault power electronic devices.
It should be noted that, in the embodiment of the present application, the fault signal (the undervoltage signal of the first voltage source) of the power circuit (7) can be detected by the processor (3), so as to determine the specific faulty power electronic device in the power circuit (7); on the contrary, if the voltage output by the first voltage source (1) is still stable and unchanged after the driving unit (6) is instructed by the processor (3) to sequentially turn on the power electronic devices, the power circuit (7) can be judged to have no fault temporarily, and the processor (3) can continue to execute subsequent operations according to business requirements.
The power-on self-test detection circuit provided by the embodiment can realize the self-test of the circuit after controlling the on-off of the power electronic device in the power circuit by converting the first voltage output by the first voltage source to supply power to the bus, and can effectively improve the reliability of the self-test of the circuit.
In one embodiment, the power-on self-test detection circuit further comprises a pre-charging loop, and the first voltage source (1) can be connected with the bus bar (8) through the pre-charging loop, and the pre-charging loop comprises a first circuit formed by connecting a first switching element (41) and an impedance element (5) in series.
The first switch element (41) is a switch element at the control end of the relay (4), and the impedance element (5) is a current-limiting resistor in the pre-charging loop, so as to realize the electrical isolation of strong current and weak current.
Specifically, referring to fig. 1, a control terminal of the relay (4) is connected to ground terminals of the processor (3) and the first voltage source (1), an output terminal of the relay (4), that is, the first switching element (41), is connected to the current limiting resistor (5) and a voltage boosting terminal of the voltage converting device (2), and the first voltage source (1) is connected to the bus (8) through the voltage converting device (2), the first switching element (41) and the current limiting resistor (5) in sequence to supply power to the bus (8).
More specifically, because the relay (4) is actually an automatic switch which uses a small current to control a large current, the relay (4) is added in the power-on self-test detection circuit, namely, after the processor (3) controls the relay to be closed, the current of the pre-charging loop is limited under the action of the current-limiting resistor (4), namely, the output voltage of the first voltage source (1) is not pulled down due to the occurrence of an overlarge charging current, and the fault alarm caused by the occurrence of a short circuit (voltage reduction) of the power circuit (7) is avoided by the erroneous judgment of the processor (3).
The power-on self-test detection circuit provided by the embodiment can avoid the fault misjudgment of the processor on the power circuit by arranging the pre-charging circuit.
In one embodiment, the pre-charging circuit of the above embodiment further comprises a second circuit connected in parallel with the first circuit, the second circuit comprising a second switching element (42).
The second switch element (42) is a switch element of a control end of the relay (4).
Specifically, referring to fig. 2, the output terminal of the relay (4) includes a first switch element (41) and a second switch element (42), and the second switch element (42) is connected in parallel on the basis of the first circuit, so that: when the pre-charging voltage controlled by the first switch element (41) reaches a certain degree (reaches a preset voltage threshold), the first switch element (41) is disconnected and the bus (8) is charged only by the second circuit, so that the pre-charging speed of the power-on self-detection circuit can be increased, and the self-detection and pre-charging time of the circuit can be further shortened.
It should be noted that the power-on self-test detection circuit provided by the present application has circuit pre-charge and power-on self-test functions. If no pre-charging function exists, the active switching element (10) on the bus (8) is closed instantly enough to cause the circuit capacitor to generate instant high voltage to damage other parts; without the self-checking function, the power electronic device and other parts can be damaged secondarily when the high-voltage power is on.
The power-on self-detection circuit provided by the embodiment has the advantages that the pre-charging circuit with the double parallel circuits is arranged, so that the self-detection and pre-charging time of the circuit can be shortened on the basis of avoiding the fault misjudgment of the processor on the power circuit, and the reliability and safety of the self-detection of the circuit are improved.
In one embodiment, the voltage conversion device (2) is an isolated boost device.
Specifically, the voltage conversion device (2) may be a low-to-high voltage isolation and boosting device of 24V (or 12V to 32V), and the low-to-high voltage isolation and boosting device is configured to isolate and convert the first voltage output by the first voltage source (1) into a preset high voltage. It can be understood that, in other embodiments, the voltage conversion device (2) may also be a low-voltage to high-voltage isolation boosting device of 15V out of 12V to 32V, that is, the low voltage value at this time is determined by the first voltage source (1), for example, if the output voltage of the first voltage source (1) is 15V, the voltage conversion device (2) needs to be a 15V to high-voltage isolation boosting device; if the output voltage of the first voltage source (1) is 24V (or 12V-32V), the voltage conversion device (2) needs to be a 24V low-voltage to high-voltage isolation boosting device. Therefore, the present application does not specifically limit the value of the low voltage required in the circuit.
The power-on self-test detection circuit provided by the embodiment can improve the reliability and safety of the circuit self-test on the basis of ensuring the pre-charge safety by arranging the isolation boosting device to convert the voltage output by the first voltage source into the pre-charge voltage.
In one embodiment, the first switching element (41) and/or the second switching element (42) is configured as a controllable switching element or as an uncontrollable switching element.
In particular, the non-controllable switching element may be a diode and the controllable switching element may be a switching element as shown in fig. 1-2, the controllable switching element being controllable by the processor (3).
According to the power-on self-detection circuit provided by the embodiment, the switch element is set to be the controllable switch element or the uncontrollable switch element, the controllable voltage cannot be reversely connected in series, and the reliability of the circuit self-detection is further improved.
In one embodiment, the present application further provides an air compressor controller, where the air compressor controller includes any one of the power-on self-test detection circuits described in the above embodiments.
In one embodiment, the present application further provides a hydrogen fuel cell system including the air compressor controller as described in the above embodiments. The hydrogen fuel cell system also comprises a fuel cell controller and a hydrogen return pump controller which are connected with the air pressure controller. It can be understood that the fuel cell controller is the control brain of the fuel cell engine system, and mainly realizes the on-line detection, the real-time control and the fault diagnosis of the fuel cell system, so as to ensure the stable and reliable operation of the system.
As shown in fig. 3, in an embodiment, the present application provides a power-on self-test detection method. This embodiment is mainly illustrated by applying the method to the processor (3) in fig. 1. Referring to fig. 3, the power-on self-test detection method specifically includes steps S301 to S303, which are specifically as follows:
s301, acquiring the bus voltage of the power-on self-test detection circuit;
s302, if the bus voltage reaches a pre-charging voltage, controlling a power electronic device in the power circuit to be switched on, wherein the pre-charging voltage is obtained by converting a first voltage output by the voltage converting device to the first voltage source;
s303, detecting the output voltage value of the first voltage source based on the turned-on power electronic device;
s304, if the output voltage value is less than or equal to a preset voltage threshold value within a first preset time, determining that the power circuit is in fault.
Specifically, referring to fig. 1, the power-up sequence of the power-up self-test detection circuit is first to lower the voltage and then to raise the voltage. Before the active switch element (10) is closed, the first voltage source (1) supplies power to the bus (8) in advance, the processor (3) can control the first switch element (41) to be closed by a signal after judging that the logic function is normal, at the moment, the circuit starts to be electrified and carries out pre-charging through the impedance element (5), and the pre-charging can be finished when the bus voltage reaches the pre-charging voltage. After the pre-charging is finished, the processor (3) controls the driving unit (6) to sequentially start the power electronic devices in the power circuit (7), if a certain power electronic device has a fault, the pair transistor is started to cause instantaneous through of a bridge arm, namely, the first voltage source (1) needs to provide large current at the moment, but the power supply capacity of the power electronic device is limited, so that the voltage of the first voltage source (1) is pulled down to a preset under-voltage threshold value, the output voltage value of the first voltage source is smaller than or equal to the preset voltage threshold value within first preset time, and an under-voltage signal is detected by the driving unit (6) and then is sent to the processor (3), so that the phenomenon that the short circuit exists in the power electronic device can be judged.
For example, if the pair of transistors of the power electronic device Q1 is Q4, and if Q1 has a fault, Q4 will be instantly connected due to the short circuit, and at this time, the first voltage source (1) is required to provide a larger current than before, but the first voltage source (1) has a limited power supply, and the voltage will be decreased due to the increase of the current, so that the processor (3) can sequentially control each power electronic device to turn on, and analyze the change of the output voltage of the first voltage source (1), so as to detect the specific faulty power electronic device.
In one embodiment, before step S301, the method specifically includes the following steps:
s401, determining whether the power-on self-test detection circuit meets a preset charging trigger condition;
s402, generating a charging instruction under the condition that the power-on self-test detection circuit meets the charging trigger condition;
and S403, sending the charging instruction to a controllable switching element in the power-on self-test detection circuit, where the pre-charging instruction is used to instruct the controllable switching element to be turned on or turned off, so that the first voltage source supplies power to the bus through the voltage conversion device until the bus voltage of the bus reaches the pre-charging voltage.
The charging instruction is an instruction for instructing the switch to close to charge the bus.
Specifically, referring to fig. 1, before performing the circuit precharge operation, it is first determined whether the logic function of the circuit or the controller in which the circuit is located is normal, and when the first voltage source (1) starts to supply power and the processor (3) determines that the logic function is normal, a charging command may be generated, and the charging command is sent to the controllable switch element in the circuit by the processor (3), such as the first switch element (41) and/or the second switch element (42) shown in fig. 2, for instructing the controllable switch element to be turned on or off to supply power to the bus (8), until the bus voltage reaches the precharge voltage.
In one embodiment, the controllable switch element includes a first contact switch and/or a second contact switch, the charging command is a first charging command or a second charging command, the first charging command is used for indicating that the first contact switch is closed, the second charging command is used for indicating that the first contact switch is closed and the second contact switch is open, and after the bus voltage reaches a limited charging voltage, the second contact switch is closed and the first contact switch is open.
In particular, with reference to fig. 2, when the controllable switching element comprises only the first contact switch, the charging command is a first charging command, which may be used to instruct the first contact switch to close, so that the first voltage source (1) can supply the bus bar (8) sequentially through the voltage transforming device (2) and the impedance element (5); when the controllable switch element only comprises the first contact switch and the second contact switch, the charging command is a second charging command, and the second charging command can be used for indicating the first contact switch to be closed and the second contact switch to be opened so that the first voltage source (1) can supply power to the bus (8) to enable the bus voltage to reach the limited charging voltage, and then indicating the first contact switch to be opened and the second contact switch to be closed so that the first voltage source (1) can continuously supply the residual voltage to the bus (8) until the bus voltage reaches the pre-charging voltage.
In one embodiment, the power-on self-test detection circuit includes a driving unit, and step S302 further includes the following steps:
s501, if the bus voltage reaches a pre-charging voltage, generating a fault detection instruction;
and S502, sending the fault detection instruction to the driving unit, wherein the fault detection instruction is used for indicating the driving unit to sequentially turn on the power electronic devices in the power circuit.
Specifically, referring to fig. 1, the processor (3) may generate a fault detection instruction after detecting that the bus voltage reaches the precharge voltage, and send the instruction to the driving unit (6) to turn on the driving unit (6) one by one for the power electronics in the power circuit (7) to achieve circuit fault detection.
In one embodiment, the power-on self-test detection circuit includes a second voltage source and an active switching element, and after step S303, the following steps are specifically included:
s601, if the output voltage value is larger than the preset voltage threshold value within a first preset time, generating a control instruction;
s602, sending the control instruction to the active switching element, where the first control instruction is used to instruct the active switching element to close, so that the second voltage source supplies power to the bus when the active switching element is closed.
Specifically, referring to fig. 1, after the driving unit (6) is instructed by the processor (3) to turn on the power electronic devices one by one, the output voltage value of the first voltage source needs to be detected in real time, if the output voltage value is greater than a preset voltage threshold within a first preset time, a control instruction is generated and sent to the active switching element (10) for closing control, so that the second voltage source (9) supplies power to the bus (8) after the active switching element (10) is closed, and at this time, the circuit and the load applied by the circuit can work normally.
According to the power-on self-checking detection method, the charging trigger condition is set, so that the circuit generates the charging instruction under the condition that the charging trigger condition is met, the charging instruction is further used for controlling the controllable switch element to be switched on or switched off to supply power to the bus, and the reliability of circuit self-checking can be effectively improved on the basis of realizing the pre-charging of the high-voltage capacitor.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The above detailed description is given to a power-on self-test detection circuit and method provided by the embodiments of the present application, and specific examples are applied in the present application to explain the principle and the implementation manner of the present application, and the description of the above embodiments is only used to help understanding the technical scheme and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (10)
1. A power-on self-test detection circuit, the circuit comprising:
-a first voltage source (1), -a voltage conversion means (2), -a processor (3) and-a bus bar (8) that can supply power to a power circuit (7), said power circuit (7) comprising at least two power electronics;
the first voltage source (1) is connected with the bus (8) through the voltage conversion device (2), the voltage conversion device (2) is used for converting a first voltage output by the first voltage source (1) into a pre-charging voltage to supply power to the bus (8), the pre-charging voltage is not lower than a preset proportion of a second voltage, and the second voltage is an operating voltage of the power circuit (7);
the power circuit (7) is connected with the first voltage source (1) through the processor (3), and the processor (3) is used for controlling the power electronic device to be switched on and off and detecting the output voltage value of the first voltage source (1); when the power circuit (7) has a short-circuit fault, the output voltage value is smaller than or equal to a preset voltage threshold value, and the short-circuit current value flowing through the power circuit (7) is smaller than or equal to a preset current threshold value.
2. The power-on self-test detection circuit according to claim 1, wherein the circuit further comprises a pre-charge circuit through which the first voltage source (1) is connected to the bus bar (8), the pre-charge circuit comprising a first circuit formed by a first switching element (41) and an impedance element (5) connected in series.
3. The power-on self-test detection circuit according to claim 2, wherein the pre-charge loop further comprises a second circuit in parallel with the first circuit, the second circuit comprising a second switching element (42).
4. The power-on self-test detection circuit according to claim 1, wherein the voltage conversion device (2) is an isolated boost device.
5. Power-on self-test detection circuit according to any of claims 2 or 3, characterized in that the first switching element (41) and/or the second switching element (42) is configured as a controllable switching element or as an uncontrollable switching element.
6. A power-on self-test detection method for a power-on self-test detection circuit, wherein the power-on self-test detection circuit is the power-on self-test detection circuit of any one of claims 1 to 6, the method comprising:
acquiring the bus voltage of the power-on self-detection circuit;
if the bus voltage reaches a pre-charging voltage, controlling a power electronic device in the power circuit to be switched on, wherein the pre-charging voltage is obtained by converting a first voltage output by the voltage converting device to the first voltage source;
detecting an output voltage value of the first voltage source based on the turned-on power electronic device;
and if the output voltage value is less than or equal to a preset voltage threshold value within a first preset time, judging that the power circuit is in fault.
7. The power-on self-test detection method according to claim 6, wherein before said obtaining the bus voltage of the bus, the method further comprises:
determining whether the power-on self-test detection circuit meets a preset charging trigger condition;
generating a charging instruction under the condition that the power-on self-detection circuit meets the charging trigger condition;
and sending the charging instruction to a controllable switching element in the power-on self-test detection circuit, wherein the pre-charging instruction is used for indicating the controllable switching element to be switched on or switched off so that the first voltage source supplies power to the bus through the voltage conversion device until the bus voltage of the bus reaches the pre-charging voltage.
8. The power-on self-test detection method according to claim 7, wherein the controllable switch element comprises a first contact switch and/or a second contact switch, the charging command is a first charging command or a second charging command, the first charging command is used for indicating that the first contact switch is closed, the second charging command is used for indicating that the first contact switch is closed and the second contact switch is open, and after the bus voltage reaches a limited charging voltage, the second contact switch is closed and the first contact switch is open.
9. The power-on self-test detection method according to claim 6, wherein the power-on self-test detection circuit includes a driving unit, and the controlling of the power electronic device in the power circuit to be turned on if the bus voltage reaches a pre-charge voltage includes:
if the bus voltage reaches a pre-charging voltage, generating a fault detection instruction;
and sending the fault detection instruction to the driving unit, wherein the fault detection instruction is used for indicating the driving unit to sequentially turn on the power electronic devices in the power circuit.
10. The power-on self-test detection method according to claim 6, wherein the power-on self-test detection circuit comprises a second voltage source and an active switching element, and after the detecting the value of the output voltage of the first voltage source based on the turned-on power electronics, the method further comprises:
if the output voltage value is greater than the preset voltage threshold value within first preset time, generating a control instruction;
sending the control instruction to the active switching element, wherein the first control instruction is used for indicating the active switching element to be closed so as to supply power to the bus by the second voltage source when the active switching element is closed.
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| CN202010870944.XA CN111913129A (en) | 2020-08-26 | 2020-08-26 | Power-on self-test detection circuit and method |
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| CN202010870944.XA CN111913129A (en) | 2020-08-26 | 2020-08-26 | Power-on self-test detection circuit and method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112198451A (en) * | 2020-09-11 | 2021-01-08 | 珠海格力电器股份有限公司 | Power circuit fault detection system and fault detection method |
| CN112953272A (en) * | 2021-03-12 | 2021-06-11 | 上海电气集团股份有限公司 | Power electronic conversion device drive online self-checking method |
| CN113078823A (en) * | 2021-05-11 | 2021-07-06 | 安徽省金屹电源科技有限公司 | Based on digital full-bridge BOOST two-stage BOOST power supply |
| CN113794472A (en) * | 2021-08-30 | 2021-12-14 | 珠海亿智电子科技有限公司 | Power-on detection circuit, GPIO interface circuit and integrated circuit chip |
| CN114594748A (en) * | 2022-02-21 | 2022-06-07 | 深圳市道通科技股份有限公司 | Test equipment, diagnostic equipment and automobile diagnostic system |
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2020
- 2020-08-26 CN CN202010870944.XA patent/CN111913129A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112198451A (en) * | 2020-09-11 | 2021-01-08 | 珠海格力电器股份有限公司 | Power circuit fault detection system and fault detection method |
| CN112198451B (en) * | 2020-09-11 | 2021-10-15 | 珠海格力电器股份有限公司 | Power circuit fault detection system and fault detection method |
| CN112953272A (en) * | 2021-03-12 | 2021-06-11 | 上海电气集团股份有限公司 | Power electronic conversion device drive online self-checking method |
| CN112953272B (en) * | 2021-03-12 | 2023-10-10 | 上海电气集团股份有限公司 | Online self-checking method for driving of power electronic conversion device |
| CN113078823A (en) * | 2021-05-11 | 2021-07-06 | 安徽省金屹电源科技有限公司 | Based on digital full-bridge BOOST two-stage BOOST power supply |
| CN113794472A (en) * | 2021-08-30 | 2021-12-14 | 珠海亿智电子科技有限公司 | Power-on detection circuit, GPIO interface circuit and integrated circuit chip |
| CN113794472B (en) * | 2021-08-30 | 2023-09-29 | 珠海亿智电子科技有限公司 | Power-on detection circuit, GPIO interface circuit and integrated circuit chip |
| CN114594748A (en) * | 2022-02-21 | 2022-06-07 | 深圳市道通科技股份有限公司 | Test equipment, diagnostic equipment and automobile diagnostic system |
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