CN114347790A - High-voltage interlocking detection circuit and electronic equipment - Google Patents
High-voltage interlocking detection circuit and electronic equipment Download PDFInfo
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- CN114347790A CN114347790A CN202110218215.0A CN202110218215A CN114347790A CN 114347790 A CN114347790 A CN 114347790A CN 202110218215 A CN202110218215 A CN 202110218215A CN 114347790 A CN114347790 A CN 114347790A
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Abstract
The embodiment of the invention 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; and the processing module is used for controlling the control module to generate the 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. By implementing the embodiment of the invention, the state of the high-voltage loop can be accurately detected.
Description
Technical Field
The embodiment of the invention relates to the technical field of electronic circuits, in particular to a high-voltage interlocking detection circuit and electronic equipment.
Background
Because the influence of the electric automobile on the environment is smaller than that of the traditional automobile, the electric automobile is developed rapidly. With the rapid development of electric vehicle technology, the popularization of electric vehicles has become the development direction in the future. The high-voltage interlocking plays a decisive role in ensuring the personal safety of maintenance personnel as an important function for detecting the state of the high-voltage loop of the electric automobile. Therefore, how to accurately detect the state of the high-voltage circuit has become an urgent technical problem to be solved.
Disclosure of Invention
The embodiment of the invention discloses a high-voltage interlocking detection circuit and electronic equipment, which are used for accurately detecting the state of a high-voltage loop.
A 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 an output end of the first comparator, an output end of the second comparator and a first end of the control module, a second end of the control module is coupled with a first input end of the second comparator, a first input end of the first comparator and a first input end of the second comparator are respectively coupled with a high-voltage loop, and the reference power supply module is respectively coupled with a second input end of the first comparator and a second input end of the second comparator; the processing module is configured to control the control module to generate a Pulse Width Modulation (PWM) signal, detect a first signal output by the first comparator and a second signal output by the second comparator, and determine a state of the high-voltage circuit according to the first signal and the second signal.
The high-voltage interlock detection circuit disclosed by the embodiment of the invention can control the control module to generate the PWM signal through the processing module, detect the first signal output by the first comparator and the second signal output by the second comparator, and determine the state of the high-voltage loop according to the first signal and the second signal. Due to the fact that 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 a possible implementation, the determining, by the processing module, the state of the high-voltage circuit according to the first signal and the second signal includes: when the first signal and the second signal are both 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 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 state; when the first signal and the second signal are both low level, the processing module determines that the high-voltage loop is in a short-ground state.
In the high-voltage interlock detection circuit disclosed in the embodiment of the present invention, the first signal output by the first comparator and the second signal output by the second comparator may be PWM signals, high levels, or low levels. 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 has a fault, the fault 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 maintenance personnel can correspondingly maintain according to the fault type, and the maintenance efficiency can be improved. Therefore, the state of the high-voltage circuit can be accurately determined, and the state of the high-voltage circuit can be accurately detected. In addition, the state of the high-voltage circuit can be not only a normal state or an open circuit state, but also a short power supply state or a short ground state, and the state of the high-voltage circuit can be detected in many cases, so that the accuracy of detecting the state of the high-voltage circuit can be further improved. Further, under the condition that the high-voltage circuit has a fault, the fault type of the high-voltage circuit can be accurately determined, and therefore the accuracy of fault detection can be improved. Further, the fault type can be an open circuit, a short power supply or a short ground, 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 includes a power supply module, wherein: the power supply module is coupled with a 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.
According to the high-voltage interlocking detection circuit disclosed by the embodiment of the invention, the power supply module can supply power to the loop where the control module is located, so that the control module can work normally. In addition, power can be supplied to the two comparators, so that the first comparator and the second comparator can work normally, and the state of the high-voltage circuit can be accurately detected.
As a possible implementation, 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 module is configured to provide a reference voltage for the first comparator and the second comparator.
According to the high-voltage interlock detection circuit disclosed by the embodiment of the invention, the reference power supply module can provide reference voltage for the first comparator and the second comparator, so that the first comparator and the second comparator can compare the voltage of the other input end with the reference voltage, further different signals can be output according to different comparison results, the normal work of the first comparator and the second comparator can be ensured, and the state of a high-voltage loop can be accurately detected.
As a possible implementation, the reference power module includes a second power supply, wherein: the second power supply is coupled to the second input terminal of the first comparator and the second input terminal of the second comparator, respectively.
According to the high-voltage interlock detection circuit disclosed by the embodiment of the invention, 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 voltages 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 supply module further includes a second resistor and a third resistor, where: one end of the second resistor is coupled to the second power supply, one end of the third resistor is coupled to the ground, and the other end of the second resistor is coupled to the other end of the third resistor, the second input end of the first comparator and the second input end of the second comparator respectively.
As a possible implementation, the control module includes a switching device, wherein: the first end of the switch device is coupled with the first input end of the second comparator, the second end of the switch device is coupled with the ground end, and the third end of the switch device is coupled with the processing module.
In the high-voltage interlock detection circuit disclosed by the embodiment of the invention, the control module can comprise a switch device which is a controllable switch device, so that the processing module can generate the PWM signal by controlling the on or off of the switch 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, 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 interlock detection circuit disclosed in the embodiment of the present invention, the control module may further include a resistor, and the current flowing through the switching device may be limited by the resistor, so that the switching device may be protected.
As a possible implementation manner, 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 invention, the reference power supply module can comprise two power supplies, the reference voltages of the first comparator and the second comparator can be respectively provided by the two power supplies, and the difference of the reference voltages of the two comparators can be ensured.
As a possible implementation manner, the power supply module further includes a fifth resistor and a sixth resistor, where: one end of the fifth resistor is coupled to the third power supply, one end of the sixth resistor is coupled to the ground, and the other end of the fifth resistor is coupled to the other end of the sixth resistor and the second input end of the first comparator respectively.
As a possible implementation manner, the power supply 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 coupled to the other end of the eighth resistor and the second input end of the second comparator, respectively.
A second aspect discloses an electronic device, which at least includes a high-voltage circuit 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 invention;
FIG. 2 is a schematic diagram of another high-voltage interlock detection circuit according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of another high-voltage interlock detection circuit according to an embodiment of the disclosure;
FIG. 4 is a schematic diagram illustrating a method for determining a state of a high voltage circuit based on a first signal and a second signal according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of another high-voltage interlock detection circuit according to an embodiment of the disclosure;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention discloses a high-voltage interlocking detection circuit and electronic equipment, which are used for accurately detecting the state of a high-voltage loop. The embodiments of the present invention will be described below with reference to the drawings.
The terms "first," "second," "third," and "fourth," etc. in the description and claims of the invention and the accompanying drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprising," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process that includes a series of steps or modules is not limited to the listed steps or modules, but may alternatively include additional steps or modules not listed or 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 can be included in at least one embodiment of the application. The appearances of the phrase 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. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
It is to be understood that "coupled" in the present context is to be understood as directly coupled, i.e., directly connected (i.e., electrically connected); indirect coupling, i.e. indirect connection, i.e. connection via other devices, elements, modules etc. is also to be understood.
In order to better understand the high-voltage interlock detection circuit and the electronic device disclosed in the embodiments of the present invention, the following description is made on the related art.
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 invention. As shown in fig. 1, the high-voltage interlock detection circuit may include a high-voltage component control module and an 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 voltage value of a first value. The signal flow of this voltage signal is to 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 a voltage value, namely a second value, of the acquired signal, and then can judge whether the first value is the same as the second value, and when the second value is judged to be different from the first value, it can be determined that a fault exists in the high-voltage circuit.
In the high-voltage interlocking detection circuit, a signal for detecting the high-voltage loop is a single voltage signal and is an analog signal, and the anti-interference capability is poor, so that the state of the high-voltage loop cannot be accurately detected.
Referring to fig. 2, fig. 2 is a schematic structural diagram of another high-voltage interlock detection circuit according to an embodiment of the disclosure. 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;
and the processing module is used for controlling the control module to generate the PWM signal, 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 circuit according to the first signal and the second signal.
The processing module may generate the control signal, and then may control an operating state of the control module according to 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 first comparator C1 can determine the voltage at the first input of the first comparator C1 through a loop formed by a high voltage loop and a control module. Correspondingly, the second comparator C2 may also determine the voltage at the first input of the second comparator C2 through a loop formed by a high voltage loop and a control module. The first comparator C1 may then compare the voltage at the first input with the voltage at the second input provided by the reference power block and determine the first signal output by the first comparator C1 based on the comparison. Accordingly, the second comparator C2 may 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 second signal output by the second comparator C2 according to the comparison result.
One input end of the two input ends of the comparator inputs reference voltage, and the other end of the comparator inputs analog voltage signals. The analog voltage signal is inputted to first input terminals of the first comparator C1 and the second comparator C2, and the reference voltage is inputted to second input terminals of the first comparator C1 and the second comparator C2.
The processing module may detect the first signal output by the first comparator C1 and the second signal output by the second comparator C2, and may then determine the state of the high voltage circuit based on the first and second signals. The processing module may include 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, and it is understood 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 structural diagram of another high-voltage interlock detection circuit according to an embodiment of the disclosure. The high-voltage interlock detection circuit shown in fig. 3 is optimized from the high-voltage interlock detection circuit shown in fig. 2.
In one embodiment, the processing module determining the state of the high voltage circuit from the first signal and the second signal may include:
when the first signal and the second signal are both 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 circuit state;
when the first signal and the second signal are both at a high level, 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 level, the processing module determines that the high-voltage loop is in a short-ground state.
The first comparator output is high when the input voltage at the first input terminal of the first comparator C1 is greater than the input voltage at the second input terminal, and low when the input voltage at the first input terminal of the first comparator C1 is less than the input voltage at the second input terminal. Accordingly, in the case where the input voltage of the first input terminal of the second comparator C2 is greater than the input voltage of the second input terminal, the second comparator output is at a high level, and in the case where the input voltage of the first input terminal of the second comparator C2 is less than the input voltage of the second input terminal, the second comparator output is at a low level.
In one embodiment, the circuit high voltage interlock detection may further comprise a power 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 supply module may include a first power supply P1 and a first resistor R1, wherein:
the first power supply P1 is coupled to a first input terminal of a first comparator C1 through a first resistor R1.
The first power supply P1 can supply power to the loop where the first resistor R1 is located, that is, the loop consisting of R1, the high voltage loop and the control module. In addition, the first power supply P1 may also power the first comparator C1 and the second comparator C2, i.e., 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 block is used to provide a reference voltage for 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 a second input of the first comparator C1 and a second input of the second comparator C2, respectively.
The power supply value of the first power supply P1 and the power supply value of the second power supply P2 may be the same or different. The second power supply P2 may ensure that the first and second comparators C1 and 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 source P2, one end of the third resistor R3 is coupled to ground, and the other end of the second resistor R2 is coupled to the other end of the third resistor R3, the second input terminal of the first comparator C1, and the second input terminal of the second comparator C2, respectively.
In one case, the first power supply P1 and the second power supply P2 may be the same power supply, i.e., the power supply module may be used to supply power to the reference power supply module. At this time, the reference power module may include only the second resistor R2 and the third resistor R3, and does not include the second power P2, and one end of the second resistor R2 is coupled to the first power 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:
the first terminal of the switching device Q1 is coupled to the first input terminal of the second comparator C2, the second terminal of the switching device Q1 is coupled to ground, and the 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:
two ends of the fourth resistor R4 are respectively coupled to the first end of the switching device Q1 and the first input end of the first comparator C1.
The fourth resistor R4 has the functions of current limiting and voltage dividing. The switching device Q1 is a controllable switching device, and may be a Metal Oxide Semiconductor (MOS) transistor, a triode, or another controllable three-terminal device. 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 transistor, the base of the switching device Q1 is coupled to the processing block. The processing module may control the control module by controlling the switching device Q1.
The working principle of the high-voltage interlock detection circuit is explained in detail as follows:
when the high-voltage loop is normally connected: when the processing module controls the switching device Q1 to be turned on, the first power supply P1, the high voltage circuit, the first resistor R1, the fourth resistor R4 and the switching device Q1 form a loop, that is, when the first control module is in an operating state, the power supply module, the high voltage circuit and the control module form a loop. The input voltage at the first input terminal of the first comparator C1 is the same as the input voltage at the first input terminal of the second comparator C2. The input voltage at the first input of the first comparator C1 may be represented as follows:
wherein REF is the input voltage of the first input terminal of the first comparator C1, V1Is the voltage of the first power supply P1, Re1Is the resistance value, Re, of the first resistor R14Is the resistance of the fourth resistor R4. By the above formulaWhen the first resistor R1 and the fourth resistor R4 have the same resistance, the input voltage at the first input terminal of the first comparator C1 and the input voltage at the first input terminal of the second comparator C2 are both V1And/2, which is half the voltage of the first power source 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 of the fourth resistor R4 is 0, the input voltage at the first input terminal of the first comparator C1 and the input voltage at the first input terminal of the second comparator C2 are both 0.
In the case where the processing module controls the switching device Q1 to be turned off, the first power supply P1, the high voltage circuit, the first resistor R1, the fourth resistor R4 and the switching device Q1 cannot form a circuit, that is, in the case where the first control module is in the non-operating state, the power supply module, the high voltage circuit and the control module cannot form a circuit. 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 the voltage V of the first power supply P11. 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 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 terminal of the first comparator C1 and the input voltage of the second input terminal of the second comparator C2 are at
(or 0) and V1The voltage value in between. 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 outputs of the first comparator C1 and the second comparator C1 are both 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. It can be seen that when the high-voltage circuit is normally connected, the first signalThe sign and the second signal are both PWM signals.
When the high-voltage loop 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 circuit, the first resistor R1, the fourth resistor R4, and the switching device Q1 cannot form a circuit. The input voltage at the first input of the first comparator C1 is V1The input voltage at 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 at the first input of the first comparator C1 is V1The input voltage at 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 shorted to the power supply (i.e., shorted to the power supply): the input voltages of the first input terminal of the first comparator C1 and the first input terminal of the second comparator C2 are V no matter whether the processing module controls the switching device Q1 to be turned on or off1The outputs of the first comparator C1 and the second comparator C2 are both high.
When the high voltage loop is shorted to ground (i.e., shorted to ground): 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.
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 of electricity |
| Second signal | PWM signal | Low level of electricity | High level | Low level of electricity |
| State of high-pressure circuit | Is normal | Open circuit | Short power supply | Short ground |
TABLE 1
As shown in table 1, when the high-voltage circuit is connected normally, both 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-circuited, 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-circuited, 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 a high voltage circuit determined according to a first signal and a second signal according to an embodiment of the disclosure. As shown in fig. 4, the processing module may determine the state of the high-voltage circuit according to the detected first signal and the second signal.
In electronic equipment such as an automobile, the number of ground wires and power wires of a low-voltage interface directly connected with a high-voltage loop is large, and the situation that the low-voltage interface is short and short is frequent, so that the high-voltage interlocking circuit can accurately determine two fault types, and the high-voltage interlocking circuit is particularly important so that maintenance personnel can adopt different maintenance modes according to different fault types.
Referring to fig. 5, fig. 5 is a schematic structural diagram of another high-voltage interlock detection circuit according to an embodiment of the disclosure. The high-voltage interlock detection circuit shown in fig. 5 is optimized from the high-voltage interlock detection circuit shown in fig. 2.
In one embodiment, the processing module determining the state of the high voltage circuit from the first signal and the second signal may include:
when the first signal and the second signal are both 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 circuit state;
when the first signal and the second signal are both at a high level, 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 level, the processing module determines that the high-voltage loop is in a short-ground state.
In one embodiment, the circuit high voltage interlock detection may further comprise a power 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 supply module may include a first power supply P1 and a first resistor R1, wherein:
the first power supply P1 is coupled to a first input terminal of a first comparator C1 through a first resistor R1.
In some embodiments, a reference power block is used to provide a reference voltage for the first comparator C1 and the second comparator C2.
In one embodiment, the reference power supply module includes a third power supply P3 and a fourth power supply P4, wherein:
a third power supply P3 is coupled to a second input of the first comparator C1 and a fourth power supply P4 is coupled to a second input of the second comparator C2.
The voltages of the third power supply P3 and the fourth power supply 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 supply P3 and the fourth power supply P4 are different, different reference voltages may be supplied to the first comparator C1 and the second comparator C2. However, in order to ensure that the first comparator C1 and the second comparator C2 can work normally, 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 both at the same level
(or 0) and V1In the meantime.
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 source P3, one end of the sixth resistor R6 is coupled to ground, and the other end of the fifth resistor R5 is coupled to the other end of the sixth resistor R6 and the second input terminal 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 source P4, one end of the eighth resistor R8 is coupled to ground, and the other end of the seventh resistor R7 is coupled to the other end of the eighth resistor R8 and the second input terminal 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 resistances 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:
the first terminal of the switching device Q1 is coupled to the first input terminal of the second comparator C2, the second terminal of the switching device Q1 is coupled to ground, and the 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:
two ends of the fourth resistor R4 are respectively coupled to the first end of the switching device Q1 and the first input end of the first comparator C1.
Fig. 3 is otherwise the same as fig. 5, except that the structure of the reference power module is different, and the detailed description may refer to the related description corresponding to fig. 3.
Referring to fig. 6, fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the disclosure. As shown in fig. 6, the electronic device may include a high voltage loop and a high voltage interlock detection circuit, wherein:
two ends of the high-voltage interlocking detection circuit are respectively coupled with two ends of the high-voltage loop.
In one embodiment, the electronic device may further comprise a separating means, wherein:
the discrete device couples the high voltage interlock detection circuit and/or the high voltage loop.
Wherein the separate device may be one or more of a processor, a memory, a display screen, a camera, an audio module, a communication module, a sensor, etc.
The coupling manner of the high-voltage interlock detection circuit and the high-voltage circuit, the detailed description of the high-voltage interlock detection circuit and the high-voltage circuit can refer to the corresponding related descriptions of fig. 2, fig. 3 and fig. 5.
It should be understood that the present invention may be applied to other fields using high voltage, such as energy storage power stations, in addition to the automotive field.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present invention should be included in the scope of the present invention.
Claims (10)
1. The high-voltage interlock 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 an output end of the first comparator, an output end of the second comparator and a first end of the control module, a second end of the control module is coupled with a first input end of the second comparator, a first input end of the first comparator and a first input end of the second comparator are respectively coupled with a high-voltage loop, and the reference power supply module is respectively coupled with a second input end of the first comparator and a 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.
2. The circuit of claim 1, wherein the processing module determining the state of the high voltage circuit from the first signal and the second signal comprises:
when the first signal and the second signal are both 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 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 state;
when the first signal and the second signal are both low level, the processing module determines that the high-voltage loop is in a short-ground state.
3. The circuit of claim 1 or 2, further comprising a power module, wherein:
the power supply module is coupled with a 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.
4. The circuit of claim 3, 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.
5. The circuit of any of claims 1-4, wherein the reference power module is configured to provide a reference voltage for the first comparator and the second comparator.
6. The circuit of any of claims 1-5, wherein the reference power module comprises a second power supply, wherein:
the second power supply is coupled to the second input terminal of the first comparator and the second input terminal of the second comparator, respectively.
7. The circuit of claim 6, wherein the power module further comprises a second resistor and a third resistor, wherein:
one end of the second resistor is coupled to the second power supply, one end of the third resistor is coupled to the ground, and the other end of the second resistor is coupled to the other end of the third resistor, the second input end of the first comparator and the second input end of the second comparator respectively.
8. The circuit of any of claims 1-7, wherein the control module comprises a switching device, wherein:
the first end of the switch device is coupled with the first input end of the second comparator, the second end of the switch device is coupled with the ground end, and the third end of the switch device is coupled with the processing module.
9. The circuit of claim 8, 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.
10. An electronic device comprising at least a high voltage circuit, and a high voltage interlock detection circuit as claimed in any one of claims 1 to 9, wherein:
the high voltage loop is coupled to the high voltage interlock detection circuit.
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