CN114347790B - High-voltage interlocking detection circuit and electronic equipment - Google Patents
High-voltage interlocking detection circuit and electronic equipment Download PDFInfo
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- CN114347790B CN114347790B CN202110218215.0A CN202110218215A CN114347790B CN 114347790 B CN114347790 B CN 114347790B CN 202110218215 A CN202110218215 A CN 202110218215A CN 114347790 B CN114347790 B CN 114347790B
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Abstract
The embodiment of the application discloses a high-voltage interlocking detection circuit and electronic equipment, wherein the circuit comprises a processing module, a first comparator, a second comparator, a control module and a reference power supply module, wherein: the processing module is respectively coupled with the output end of the first comparator, the output end of the second comparator and the first end of the control module, the second end of the control module is coupled with the first input end of the second comparator, the first input end of the first comparator and the first input end of the second comparator are respectively coupled with the high-voltage loop, and the reference power supply module is respectively coupled with the second input end of the first comparator and the second input end of the second comparator; the processing module is used for controlling the control module to generate PWM signals, detecting a first signal output by the first comparator and a second signal output by the second comparator, and determining the state of the high-voltage loop according to the first signal and the second signal. By implementing the embodiment of the application, the state of the high-voltage loop can be accurately detected.
Description
Technical Field
The embodiment of the application relates to the technical field of electronic circuits, in particular to a high-voltage interlocking detection circuit and electronic equipment.
Background
Because the electric automobile has smaller influence on the environment than the traditional automobile, the electric automobile is rapidly developed. With the rapid development of electric automobile technology, the popularization of electric automobiles has become a future development direction. The high-voltage interlocking is used as an important function for detecting the state of the high-voltage loop of the electric automobile, and plays a decisive role in guaranteeing the personal safety of maintenance personnel. Therefore, how to accurately detect the state of the high-voltage circuit has become a technical problem to be solved.
Disclosure of Invention
The embodiment of the application discloses a high-voltage interlocking detection circuit and electronic equipment, which are used for accurately detecting the state of a high-voltage loop.
The first aspect discloses a high voltage interlock detection circuit, including processing module, first comparator, second comparator, control module and reference power module, wherein: the processing module is respectively coupled with the output end of the first comparator, the output end of the second comparator and the first end of the control module, the second end of the control module is coupled with the first input end of the second comparator, the first input end of the first comparator and the first input end of the second comparator are respectively coupled with the high-voltage loop, and the reference power supply module is respectively coupled with the second input end of the first comparator and the second input end of the second comparator; the processing module is used for controlling the control module to generate pulse width modulation (pulse width modulation, PWM) signals, detecting a first signal output by the first comparator and a second signal output by the second comparator, and determining the state of the high-voltage loop according to the first signal and the second signal.
According to the high-voltage interlocking detection circuit disclosed by the embodiment of the application, the processing module can control the control module to generate the PWM signal, the first signal output by the first comparator and the second signal output by the second comparator are detected, and the state of the high-voltage loop is determined according to the first signal and the second signal. Because the anti-interference capability of the PWM signal is strong, the problem of inaccurate detection caused by interference and the like can be avoided, and the state of the high-voltage loop can be accurately detected.
As one possible implementation, the determining, by the processing module, the state of the high voltage loop according to the first signal and the second signal includes: when the first signal and the second signal are PWM signals, the processing module determines that the high-voltage loop is in a normal state; when the first signal is at a high level and the second signal is at a low level, the processing module determines that the high-voltage loop is in an open state; when the first signal and the second signal are both high, the processing module determines that the high-voltage loop is in a short power state; when the first signal and the second signal are both low, the processing module determines that the high voltage loop is in a short-to-ground state.
In the high-voltage interlocking detection circuit disclosed by the embodiment of the application, the first signal output by the first comparator and the second signal output by the second comparator can be PWM signals, high level signals and low level signals. Therefore, according to the signals output by the two comparators, the state of the high-voltage loop, namely the normal state, the open-circuit state, the short power supply state or the short ground state, can be determined, and under the condition that the high-voltage loop fails, the failure type of the high-voltage loop, namely the open-circuit state, the short power supply state or the short ground state, can be determined, so that a maintainer can correspondingly maintain according to the failure type, and the maintenance efficiency can be improved. Therefore, the state of the high-voltage loop can be accurately determined, and the state of the high-voltage loop can be accurately detected. In addition, the state of the high-voltage loop can be not only a normal state or an open state, but also a short power supply state or a short ground state, and the state of the high-voltage loop can be detected more, so that the accuracy of detecting the state of the high-voltage loop can be further improved. Further, under the condition that the high-voltage loop fails, the failure type of the high-voltage loop can be accurately determined, so that the accuracy of failure detection can be improved. Further, the fault types can be open circuits, short power sources or short grounds, and more fault types can be detected, so that the accuracy of fault type detection can be further improved.
As a possible implementation, the circuit further comprises a power supply module, wherein: the power supply module is coupled with the first input end of the first comparator; the power supply module is used for supplying power to a loop where the control module is located.
According to the high-voltage interlocking detection circuit disclosed by the embodiment of the application, the power supply module can supply power to a loop where the control module is located, so that the control module can work normally. In addition, can also supply power for two comparators to first comparator and second comparator can normally work, and then can accurately detect the state of high voltage circuit.
As a possible implementation manner, the power supply module includes a first power supply and a first resistor, where: the first power supply is coupled to a first input of the first comparator through the first resistor.
As a possible implementation manner, the reference power supply module is configured to provide a reference voltage for the first comparator and the second comparator.
According to the high-voltage interlocking detection circuit disclosed by the embodiment of the application, the reference power supply module can provide reference voltages for the first comparator and the second comparator, so that the first comparator and the second comparator can compare with the reference voltages according to the voltage of the other input end, further different signals can be output according to different comparison results, and the normal operation of the first comparator and the second comparator can be ensured, so that the state of a high-voltage loop can be accurately detected.
As one possible implementation, the reference power supply module includes a second power supply, wherein: the second power supply is coupled to the second input of the first comparator and the second input of the second comparator, respectively.
According to the high-voltage interlocking detection circuit disclosed by the embodiment of the application, the reference power supply module can only comprise one power supply, and the reference voltages of the first comparator and the second comparator can be provided by the power supply, so that the reference voltages of the two comparators can be ensured to be the same. In addition, since the reference voltage can be supplied to the two comparators by one power supply, the number of devices in the circuit can be reduced, and thus the complexity, area, and cost of the circuit can be reduced.
As a possible implementation manner, the power module further includes a second resistor and a third resistor, where: one end of the second resistor is coupled with the second power supply, one end of the third resistor is coupled with the ground, and the other end of the second resistor is respectively coupled with the other end of the third resistor, the second input end of the first comparator and the second input end of the second comparator.
As a possible implementation, the control module includes a switching device, where: the first end of the switching device is coupled with the first input end of the second comparator, the second end of the switching device is coupled with the ground end, and the third end of the switching device is coupled with the processing module.
According to the high-voltage interlocking detection circuit disclosed by the embodiment of the application, the control module can comprise a switching device which is a controllable switching device, so that the processing module can generate a PWM signal by controlling the on or off of the switching device, and further can detect the state of the high-voltage loop according to the PWM signal, thereby accurately detecting the state of the high-voltage loop.
As a possible implementation manner, the control module further includes a fourth resistor, where: two ends of the fourth resistor are respectively coupled with the first end of the switching device and the first input end of the first comparator.
In the high-voltage interlocking detection circuit disclosed by the embodiment of the application, the control module can also comprise a resistor, and the current flowing through the switching device can be limited through the resistor, so that the switching device can be protected.
As one possible implementation, the reference power module includes a third power supply and a fourth power supply, where: the third power supply is coupled to the second input of the first comparator, and the fourth power supply is coupled to the second input of the second comparator.
According to the high-voltage interlocking detection circuit disclosed by the embodiment of the application, the reference power supply module can comprise two power supplies, and the reference voltages of the first comparator and the second comparator can be respectively provided by the two power supplies, so that the difference of the reference voltages of the two comparators can be ensured.
As a possible implementation manner, the power module further includes a fifth resistor and a sixth resistor, where: one end of the fifth resistor is coupled with the third power supply, one end of the sixth resistor is coupled with the ground, and the other end of the fifth resistor is respectively coupled with the other end of the sixth resistor and the second input end of the first comparator.
As a possible implementation manner, the power module further includes a seventh resistor and an eighth resistor, where: one end of the seventh resistor is coupled to the fourth power supply, one end of the eighth resistor is coupled to the ground, and the other end of the seventh resistor is respectively coupled to the other end of the eighth resistor and the second input end of the second comparator.
A second aspect discloses an electronic device, at least comprising a high voltage loop, and the high voltage interlock detection circuit disclosed in the first aspect or any one of the possible implementation manners of the first aspect, wherein:
the high voltage loop is coupled to the high voltage interlock detection circuit.
Drawings
Fig. 1 is a schematic structural diagram of a high-voltage interlock detection circuit according to an embodiment of the present application;
FIG. 2 is a schematic diagram of another high voltage interlock detection circuit according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a further high voltage interlock detection circuit according to an embodiment of the present application;
FIG. 4 is a schematic diagram of determining a state of a high voltage loop according to a first signal and a second signal according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a further high voltage interlock detection circuit according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The embodiment of the application discloses a high-voltage interlocking detection circuit and electronic equipment, which are used for accurately detecting the state of a high-voltage loop. Embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.
The terms "first," "second," "third," and "fourth" and the like in the description and in the claims and drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprise," "have," and any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process that comprises a series of steps or modules is not limited to the steps or modules listed but may alternatively include steps or modules not listed or may alternatively include other steps or modules inherent to such process or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
It is to be understood that "coupled" in this disclosure may be understood as directly coupled, i.e., directly connected (i.e., electrically connected); it is also to be understood that the coupling is indirect, i.e. the connection is made via other devices, elements, modules, etc.
In order to better understand a high-voltage interlock detection circuit and an electronic device disclosed in an embodiment of the present application, a related art will be described below.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a high-voltage interlock detection circuit according to an embodiment of the present application. As shown in fig. 1, the high voltage interlock detection circuit may include a high voltage component control module and an electromagnetic compatibility (electromagnetic compatibility, EMC) filter, wherein:
the output end of the high-voltage component control module is coupled with the first end of the EMC filter, the input end of the high-voltage component control module is coupled with the second end of the EMC filter, and the third end and the fourth end of the EMC filter are respectively coupled with the high-voltage loop.
The high voltage component control module may generate a constant voltage signal having a first value. The signal flow direction of the voltage signal is the high-voltage component control module-EMC filter-high-voltage loop-EMC filter-high-voltage component control module. The high-voltage component control module detects the voltage value of the collected signal, namely a second value, then can judge whether the first value is the same as the second value, and when the second value is different from the first value, can determine that the high-voltage loop has faults.
In the high-voltage interlocking detection circuit, the signal used for detecting the high-voltage loop is a single voltage signal and is an analog signal, so that the anti-interference capability is poor, and the state of the high-voltage loop cannot be accurately detected.
Referring to fig. 2, fig. 2 is a schematic diagram illustrating a structure of another high voltage interlock detection circuit according to an embodiment of the present application. As shown in fig. 2, the high voltage interlock detection circuit may include a processing module, a first comparator C1, a second comparator C2, a control module, and a reference power module, wherein:
the first end of the processing module is coupled with the output end of the first comparator C1, the second end of the processing module is coupled with the output end of the second comparator C2, the third end of the processing module is coupled with the first end of the control module, the second end of the control module is coupled with the first input end of the second comparator C2, the first input end of the first comparator C1 and the first input end of the second comparator C2 are respectively coupled with two ends of the high-voltage loop, and the reference power supply module is respectively coupled with the second input end of the first comparator C1 and the second input end of the second comparator C2;
the processing module is used for controlling the control module to generate PWM signals, detecting a first signal output by the first comparator C1 and a second signal output by the second comparator C2, and determining the state of the high-voltage loop according to the first signal and the second signal.
The processing module may generate a control signal, and may then control the operating state of the control module based on the control signal so that the control module may generate the PWM signal. The control signal may be a PWM signal. The operating state of the control module may include two states, an operating state and a non-operating state.
The voltage of the first input end of the first comparator C1 can be determined by a loop formed by the high-voltage loop and the control module through the first comparator C1. Correspondingly, the voltage of the first input end of the second comparator C2 can also be determined by a loop formed by the high-voltage loop and the control module through the second comparator C2. The first comparator C1 may then compare the voltage at the first input terminal with the voltage at the second input terminal provided by the reference power module, and determine the first signal output by the first comparator C1 according to the comparison result. Accordingly, the second comparator C2 may compare the voltage of the first input terminal with the voltage of the second input terminal provided by the reference power module, and determine the second signal output by the second comparator C2 according to the comparison result.
One of the two input ends of the comparator inputs a reference voltage, and the other end inputs an analog voltage signal. The first input terminals of the first and second comparators C1 and C2 input analog voltage signals, and the second input terminals of the first and second comparators C1 and C2 input reference voltages.
The processing module may detect the first signal output from the first comparator C1 and the second signal output from the second comparator C2, and then may determine the state of the high voltage loop according to the first signal and the second signal. The processing module may comprise a single-chip microcomputer.
The first input terminal of the first comparator C1 and the first input terminal of the second comparator C2 are respectively coupled to two ends of the high voltage loop, which is understood to mean that the first input terminal of C1 and the first input terminal of C2 are not directly connected to the high voltage loop, but are connected to the high voltage loop through a low voltage interface of the high voltage loop.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating a structure of a high voltage interlock detection circuit according to another embodiment of the present application. The high-voltage interlocking detection circuit shown in fig. 3 is optimized by the high-voltage interlocking detection circuit shown in fig. 2.
In one embodiment, the processing module determining the state of the high voltage loop from the first signal and the second signal may include:
when the first signal and the second signal are PWM signals, the processing module determines that the high-voltage loop is in a normal state;
when the first signal is in a high level and the second signal is in a low level, the processing module determines that the high-voltage loop is in an open circuit state;
when the first signal and the second signal are both high level, the processing module determines that the high-voltage loop is in a short power supply state;
when the first signal and the second signal are both at low level, the processing module determines that the high voltage loop is in a short-to-ground state.
The first comparator output is high when the input voltage of the first input terminal of the first comparator C1 is greater than the input voltage of the second input terminal, and is low when the input voltage of the first input terminal of the first comparator C1 is less than the input voltage of the second input terminal. Accordingly, the second comparator output is high level in case that the input voltage of the first input terminal of the second comparator C2 is greater than the input voltage of the second input terminal, and is low level in case that the input voltage of the first input terminal of the second comparator C2 is less than the input voltage of the second input terminal.
In one embodiment, the circuit high voltage interlock detection may further comprise a power supply module, wherein:
the power supply module is coupled with the first input end of the first comparator;
and the power supply module is used for supplying power to a loop where the control module is located.
In one embodiment, the power module may include a first power source P1 and a first resistor R1, wherein:
the first power supply P1 is coupled to the first input of the first comparator C1 through a first resistor R1.
The first power supply P1 may supply power to a loop where the first resistor R1 is located, that is, a loop formed by R1, a high-voltage loop, and a control module. In addition, the first power supply P1 may also supply power to the first comparator C1 and the second comparator C2, that is, the first power supply P1 is coupled to the power supply terminal of the first comparator C1 and the power supply terminal of the second comparator C2, respectively.
In some embodiments, a reference power supply module is configured to provide a reference voltage to the first comparator C1 and the second comparator C2.
In one embodiment, the reference power module may include a second power supply P2, wherein:
the second power supply is coupled to the second input of the first comparator C1 and the second input of the second comparator C2, respectively.
The power supply value of the first power supply P1 may be the same as or different from the power supply value of the second power supply P2. The second power supply P2 may ensure that the first comparator C1 and the second comparator C2 have the same reference voltage.
In one embodiment, the power module may further include a second resistor R2 and a third resistor R3, wherein:
one end of the second resistor R2 is coupled to the second power supply P2, one end of the third resistor R3 is coupled to the ground, and the other end of the second resistor R2 is respectively coupled to the other end of the third resistor R3, the second input end of the first comparator C1, and the second input end of the second comparator C2.
In one case, the first power source P1 and the second power source P2 may be the same power source, i.e. the power source module may be used to supply power to the reference power source module. At this time, the reference power supply module may include only the second resistor R2 and the third resistor R3, excluding the second power supply P2, and one end of the second resistor R2 is coupled to the first power supply P1.
The second resistor R2 and the third resistor R3 have the functions of current limiting and voltage dividing.
In one embodiment, the control module may include a switching device Q1, wherein:
a first terminal of the switching device Q1 is coupled to the first input terminal of the second comparator C2, a second terminal of the switching device Q1 is coupled to the ground terminal, and a third terminal of the switching device Q1 is coupled to the processing module.
In one embodiment, the control module may further include a fourth resistor R4, wherein:
both ends of the fourth resistor R4 are coupled to the first end of the switching device Q1 and the first input end of the first comparator C1, respectively.
The fourth resistor R4 has the functions of current limiting and voltage dividing. The switching device Q1 is a controllable switching device, which may be a metal oxide semiconductor (metal oxide semiconductor, MOS) transistor, a triode, or other controllable three-terminal controllable devices. When the switching device Q1 is a MOS transistor, the gate of the switching device Q1 is coupled to the processing module. When the switching device Q1 is a triode, the base of the switching device Q1 is coupled to the processing module. The processing module may control the control module by controlling the switching device Q1.
The working principle of the high-voltage interlocking detection circuit is described in detail below:
when the high-voltage loop connection is normal: under the condition that the processing module controls the switching device Q1 to be conducted, the first power supply P1, the high-voltage loop, the first resistor R1, the fourth resistor R4 and the switching device Q1 form a loop, namely under the condition that the first control module is in a working state, the power supply module, the high-voltage loop and the control module form a loop. The input voltage of the first input terminal of the first comparator C1 is the same as the input voltage of the first input terminal of the second comparator C2. The input voltage at the first input of the first comparator C1 may be expressed as follows:
wherein REF is the input voltage of the first input terminal of the first comparator C1, V 1 Re is the voltage of the first power supply P1 1 Re is the resistance of the first resistor R1 4 The resistance of the fourth resistor R4. As can be seen from the above formula, when the resistances of the first resistor R1 and the fourth resistor R4 are the same, the input voltage of the first input terminal of the first comparator C1 and the input voltage of the first input terminal of the second comparator C2 are both V 1 I.e. half the voltage of the first power supply P1. For example, when the voltage of the first power source P1 is 12V, the input voltage of the first input terminal of the first comparator C1 and the input voltage of the first input terminal of the second comparator C2 are 6V. When there is no fourth resistor R4, i.e., the resistance value of the fourth resistor R4 is 0, the input voltage of the first input terminal of the first comparator C1 and the input voltage of the first input terminal of the second comparator C2 are both 0.
Under the condition that the processing module controls the switching device Q1 to be turned off, the first power supply P1, the high-voltage loop, the first resistor R1, the fourth resistor R4 and the switching device Q1 cannot form a loop, namely, under the condition that the first control module is in a non-working state, the power supply module, the high-voltage loop and the control module cannot form a loop. The input voltage of the first input end of the first comparator C1 and the input voltage of the first input end of the second comparator C2 are the voltage V of the first power supply P1 1 . For example, when the voltage of the first power supply P1 is 12V, the input voltage of the first input terminal of the first comparator C1 and the first input of the second comparator C2The input voltage at the input terminal is 12V.
In order to ensure that the first comparator C1 and the second comparator C2 can work normally, the input voltage of the second input end of the first comparator C1 and the input voltage of the second input end of the second comparator C2 are in(or 0) and V 1 Voltage values therebetween. For example, when the voltage of the first power source P1 is 12V, the input voltage of the second input terminal of the first comparator C1 and the input voltage of the second input terminal of the second comparator C2 are values between 6 (0) V and 12V. Under the condition that the processing module controls the switching device Q1 to be conducted, the output of the first comparator C1 and the output of the second comparator C1 are both in low level; in the case where the processing module controls the switching device Q1 to be turned off, the outputs of the first comparator C1 and the second comparator C1 are both high level. It can be seen that when the high voltage loop is normally connected, the first signal and the second signal are both PWM signals.
When the high voltage circuit is open: in the case where the processing module controls the switching device Q1 to be turned on, the first power source P1, the high voltage loop, the first resistor R1, the fourth resistor R4, and the switching device Q1 cannot form a loop. The input voltage of the first input end of the first comparator C1 is V 1 The input voltage of the first input terminal of the second comparator C2 is 0. The output of the first comparator C1 is high and the output of the second comparator C2 is low.
In the case where the processing module controls the switching device Q1 to be turned off, the first power source P1, the high voltage loop, the first resistor R1, the fourth resistor R4, and the switching device Q1 cannot form a loop. The input voltage of the first input end of the first comparator C1 is V 1 The input voltage of the first input terminal of the second comparator C2 is 0. The output of the first comparator C1 is high and the output of the second comparator C2 is low.
When the high voltage loop is short to the power supply (i.e., shorted to the power supply): the first input terminal of the first comparator C1 and the first input terminal of the second comparator C2 are both input voltages V regardless of whether the processing module controls the switching device Q1 to be turned on or off 1 A first comparator C1 and a second comparator C2The outputs of (2) are all high.
When the high voltage loop is short to ground (i.e., short to ground): regardless of whether the processing module controls the switching device Q1 to be turned on or off, the input voltages of the first input terminal of the first comparator C1 and the first input terminal of the second comparator C2 are both 0, and the outputs of the first comparator C1 and the second comparator C2 are both low level.
From the above analysis, the relationship between the first signal, the second signal and the state of the high-voltage circuit can be shown in table 1:
| first signal | PWM signal | High level | High level | Low level |
| Second signal | PWM signal | Low level | High level | Low level |
| State of high-voltage circuit | Normal state | Open circuit | Short power supply | Short land |
TABLE 1
As shown in table 1, when the high-voltage loop connection is normal, the first signal output by the first comparator C1 and the second signal output by the second comparator C2 are PWM signals. When the high-voltage loop is open, the first signal output by the first comparator C1 is at a high level, and the second signal output by the second comparator C2 is at a second level. When the high-voltage loop is short in power supply, the first signal output by the first comparator C1 and the second signal output by the second comparator C2 are both high level. When the high-voltage loop is short, the first signal output by the first comparator C1 and the second signal output by the second comparator C2 are both low.
Referring to fig. 4, fig. 4 is a schematic diagram illustrating a state of determining a high voltage loop according to a first signal and a second signal according to an embodiment of the application. As shown in fig. 4, the processing module may determine, according to the detected first signal and the detected second signal, a state in which the high-voltage loop is located.
In electronic equipment such as automobiles, the number of the ground wires and the power wires of the low-voltage interfaces directly connected with the high-voltage loop is large, and the situations of short ground and short power supply of the low-voltage interfaces occur sometimes, so that the high-voltage interlocking circuit can accurately determine the two fault types, and a maintainer can conveniently adopt different maintenance modes according to different fault types.
Referring to fig. 5, fig. 5 is a schematic diagram illustrating a structure of a high voltage interlock detection circuit according to another embodiment of the present application. The high-voltage interlocking detection circuit shown in fig. 5 is optimized by the high-voltage interlocking detection circuit shown in fig. 2.
In one embodiment, the processing module determining the state of the high voltage loop from the first signal and the second signal may include:
when the first signal and the second signal are PWM signals, the processing module determines that the high-voltage loop is in a normal state;
when the first signal is in a high level and the second signal is in a low level, the processing module determines that the high-voltage loop is in an open circuit state;
when the first signal and the second signal are both high level, the processing module determines that the high-voltage loop is in a short power supply state;
when the first signal and the second signal are both at low level, the processing module determines that the high voltage loop is in a short-to-ground state.
In one embodiment, the circuit high voltage interlock detection may further comprise a power supply module, wherein:
the power supply module is coupled with the first input end of the first comparator;
and the power supply module is used for supplying power to a loop where the control module is located.
In one embodiment, the power module may include a first power source P1 and a first resistor R1, wherein:
the first power supply P1 is coupled to the first input of the first comparator C1 through a first resistor R1.
In some embodiments, a reference power supply module is configured to provide a reference voltage to the first comparator C1 and the second comparator C2.
In one embodiment, the reference power module includes a third power supply P3 and a fourth power supply P4, wherein:
the third power supply P3 is coupled to the second input of the first comparator C1, and the fourth power supply P4 is coupled to the second input of the second comparator C2.
The voltages of the third power source P3 and the fourth power source P4 may be the same or different. When the voltages of the third power source P3 and the fourth power source P4 are the same, the third power source P3 and the fourth power source P4 may be combined into one power source as shown in fig. 3. When the voltages of the third power source P3 and the fourth power source P4 are different, different reference voltages may be provided to the first comparator C1 and the second comparator C2. But in order to ensure that the first comparator C1 and the second comparator C2 can work normally, the input voltage of the second input end of the first comparator C1 and the input voltage of the second input end of the second comparator C2 are both in(or 0) and V 1 Between them.
In one embodiment, the power module may further include a fifth resistor R5 and a sixth resistor R6, wherein:
one end of the fifth resistor R5 is coupled to the third power supply P3, one end of the sixth resistor R6 is coupled to the ground, and the other end of the fifth resistor R5 is respectively coupled to the other end of the sixth resistor R6 and the second input end of the first comparator C2.
In one embodiment, the power module may further include a seventh resistor R7 and an eighth resistor R8, wherein:
one end of the seventh resistor R7 is coupled to the fourth power supply P4, one end of the eighth resistor R8 is coupled to the ground, and the other end of the seventh resistor R7 is respectively coupled to the other end of the eighth resistor R8 and the second input end of the second comparator C2.
The sixth resistor R6 and the eighth resistor R8 may be combined into one resistor. When the voltages of the third power source P3 and the fourth power source P4 are the same and the sixth resistor R6 and the eighth resistor R8 are combined into one resistor, the resistance values of the fifth resistor R5 and the seventh resistor R7 are different.
In one embodiment, the control module may include a switching device Q1, wherein:
a first terminal of the switching device Q1 is coupled to the first input terminal of the second comparator C2, a second terminal of the switching device Q1 is coupled to the ground terminal, and a third terminal of the switching device Q1 is coupled to the processing module.
In one embodiment, the control module may further include a fourth resistor R4, wherein:
both ends of the fourth resistor R4 are coupled to the first end of the switching device Q1 and the first input end of the first comparator C1, respectively.
Fig. 3 is otherwise identical to fig. 5, except that the reference power module has a different structure, and the detailed description will be made with reference to the corresponding related description of fig. 3.
Referring to fig. 6, fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the application. As shown in fig. 6, the electronic device may include a high voltage loop and a high voltage interlock detection circuit, wherein:
the two ends of the high-voltage interlocking detection circuit are respectively coupled with the two ends of the high-voltage loop.
In one embodiment, the electronic device may further comprise a separation device, wherein:
the discrete devices are coupled to the high voltage interlock detection circuit and/or the high voltage loop.
The separation device may be one or more of a processor, a memory, a display screen, a camera, an audio module, a communication module, a sensor, and the like.
The coupling manner of the high-voltage interlock detection circuit and the high-voltage loop, and the detailed description of the high-voltage interlock detection circuit and the high-voltage loop can refer to the corresponding related descriptions of fig. 2, 3 and 5.
It should be understood that the present application may be applied to other fields using high voltage, such as energy storage power stations, in addition to automotive fields.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present application in further detail, and are not to be construed as limiting the scope of the application, but are merely intended to cover any modifications, equivalents, improvements, etc. based on the teachings of the application.
Claims (9)
1. The high-voltage interlocking detection circuit is characterized by comprising a processing module, a first comparator, a second comparator, a control module and a reference power supply module, wherein:
the processing module is respectively coupled with the output end of the first comparator, the output end of the second comparator and the first end of the control module, the second end of the control module is coupled with the first input end of the second comparator, the first input end of the first comparator and the first input end of the second comparator are respectively coupled with the high-voltage loop, and the reference power supply module is respectively coupled with the second input end of the first comparator and the second input end of the second comparator;
the processing module is used for controlling the control module to generate a Pulse Width Modulation (PWM) signal, detecting a first signal output by the first comparator and a second signal output by the second comparator, and determining the state of the high-voltage loop according to the first signal and the second signal;
when the first signal and the second signal are PWM signals, the processing module determines that the high-voltage loop is in a normal state;
when the first signal is at a high level and the second signal is at a low level, the processing module determines that the high-voltage loop is in an open state;
when the first signal and the second signal are both high, the processing module determines that the high-voltage loop is in a short power state;
when the first signal and the second signal are both low, the processing module determines that the high voltage loop is in a short-to-ground state.
2. The circuit of claim 1, further comprising a power supply module, wherein:
the power supply module is coupled with the first input end of the first comparator;
the power supply module is used for supplying power to a loop where the control module is located.
3. The circuit of claim 2, wherein the power module comprises a first power source and a first resistor, wherein:
the first power supply is coupled to a first input of the first comparator through the first resistor.
4. A circuit according to any of claims 1-3, wherein the reference power supply module is arranged to provide a reference voltage for the first comparator and the second comparator.
5. The circuit of any of claims 1-4, wherein the reference power module comprises a second power supply, wherein:
the second power supply is coupled to the second input of the first comparator and the second input of the second comparator, respectively.
6. The circuit of claim 5, wherein the power module further comprises a second resistor and a third resistor, wherein:
one end of the second resistor is coupled with the second power supply, one end of the third resistor is coupled with the ground, and the other end of the second resistor is respectively coupled with the other end of the third resistor, the second input end of the first comparator and the second input end of the second comparator.
7. The circuit of any of claims 1-6, wherein the control module comprises a switching device, wherein:
the first end of the switching device is coupled with the first input end of the second comparator, the second end of the switching device is coupled with the ground end, and the third end of the switching device is coupled with the processing module.
8. The circuit of claim 7, wherein the control module further comprises a fourth resistor, wherein:
two ends of the fourth resistor are respectively coupled with the first end of the switching device and the first input end of the first comparator.
9. An electronic device comprising at least a high voltage loop, and a high voltage interlock detection circuit as claimed in any one of claims 1-8, wherein:
the high voltage loop is coupled to the high voltage interlock detection circuit.
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