CN210128995U - Charging voltage acquisition circuit, charging fault diagnosis circuit and charging device - Google Patents
Charging voltage acquisition circuit, charging fault diagnosis circuit and charging device Download PDFInfo
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Abstract
The embodiment of the utility model discloses charging voltage acquisition circuit, charging fault diagnosis circuit and charging device can guarantee charging voltage's voltage acquisition and fault diagnosis's accuracy to guarantee to fill electric pile and can in time handle the excessive pressure trouble and avoid the malfunction. The above charging voltage acquisition circuit is used for acquiring the charging voltage of the high-power charging device in the charging process and judging the fault condition of the charging device according to the charging voltage, and may include: the resistance voltage division sampling circuit is connected with the voltage output end of the charging device and is used for collecting the charging voltage output by the charging device when the charging device charges a charged object; the optical coupling isolation circuit is connected with the output end of the resistance voltage division sampling circuit; the output end of the optical coupling isolation circuit sends the processed charging voltage signal to the controller through the analog-to-digital conversion circuit, so that the controller judges the fault condition of the charging device according to the charging voltage signal.
Description
Technical Field
The utility model belongs to the technical field of high-power charging, especially, relate to a charging voltage acquisition circuit, charging fault diagnosis circuit and charging device.
Background
During the high-power charging process of the device driven by electric energy, the electric connection part of the charging device and the charged device can pass higher voltage and current. In order to ensure the safety of personnel and equipment, high-voltage overvoltage protection in the charging process becomes necessary, and in order to ensure the timeliness, stability and accuracy of overvoltage protection, the timeliness, stability and accuracy of charging voltage acquisition need to be ensured firstly.
The existing overvoltage protection has two main modes, the first mode is as follows: sampling by adopting resistance partial pressure and then sending the sampled data to a control unit; the control unit compares the real-time sampling voltage and acts; the second way is: the sampling voltage value is transmitted to the control unit through the ammeter, and the control unit acts according to the comparison between the sampling voltage value transmitted by the ammeter and the reference value. However, because the electric meter is limited by its sampling characteristic, the transmission signal rate is low, and the requirement of signal real-time detection and protection actions cannot be met, the subsequent actions of the control unit are slow, and loss such as equipment damage is generated.
Although the first mode has good real-time performance, the high-voltage sampling and control unit is not isolated, so that potential safety hazards exist in the middle connection part of the high-voltage circuit and the low-voltage circuit. Accurate devices such as chips in the circuit are easily interfered, and sampled voltage values are easily interfered to cause overlarge sampling value deviation, so that protection misoperation or action is not timely.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a charging voltage acquisition circuit, charging fault diagnosis circuit and charging device can guarantee charging voltage's voltage acquisition and fault diagnosis's accuracy to guarantee to fill electric pile and can in time handle the excessive pressure trouble and avoid the malfunction.
In a first aspect, an embodiment of the present invention provides a charging voltage acquisition circuit for acquiring a charging voltage during a charging process of a high-power charging device and determining a fault condition of the charging device according to the charging voltage, including:
the resistance voltage division sampling circuit is connected with the voltage output end of the charging device and is used for collecting the charging voltage output by the charging device when the charging device charges a charged object;
the optical coupling isolation circuit is connected with the output end of the resistance voltage division sampling circuit;
the output end of the optical coupling isolation circuit sends the processed charging voltage signal to the controller through the analog-to-digital conversion circuit, so that the controller judges the fault condition of the charging device according to the charging voltage signal.
In a second possible implementation manner of the first aspect, the optical coupling isolation circuit may adopt any one of the optical coupling isolators ACPL-C790, ACPL-C870 and AMC 1311.
In a third possible implementation manner of the first aspect, the charging voltage acquisition circuit may further include:
and the signal amplification circuit is connected with the output end of the optical coupling isolation circuit and is used for stably amplifying the output voltage signal of the optical coupling isolation circuit.
In a fourth possible implementation manner of the first aspect, the signal amplifying circuit is a triple-operational-amplifier differential amplifying circuit or an integrated single-power instrumentation amplifier.
In a fifth possible implementation manner of the first aspect, the optical coupler isolation circuit further includes a filter circuit, where the filter circuit includes capacitors connected in parallel to two ends of a sampling resistor of the resistor voltage division sampling circuit.
In a sixth possible implementation manner of the first aspect, the REF pin of the signal amplification circuit is connected to a boost voltage, so that the analog-to-digital converted input voltage signal is a positive value.
In a second aspect, an embodiment of the present invention provides a charging fault diagnosis circuit, which may include the charging voltage acquisition circuit described in the first aspect; and the controller is used for judging the fault condition of the charging device according to the charging voltage signal obtained by the charging voltage acquisition circuit.
In a second possible implementation manner of the second aspect, the controller is configured to compare the charging voltage signal obtained by the charging voltage acquisition circuit with a preset value at predetermined time intervals, and determine that the charging circuit has an overvoltage charging fault when the charging voltage signal is greater than or equal to the preset value.
In a third possible implementation manner of the second aspect, the controller is configured to compare the charging voltage signal obtained by the charging voltage acquisition circuit with a preset value at predetermined time intervals, and when the charging voltage signal is greater than or equal to the preset value, determine that an overvoltage charging fault report exists in the charging circuit and send an overvoltage charging fault alarm signal.
In a third aspect, an embodiment of the present invention provides a charging device, which may include the charging fault diagnosis circuit described in the second aspect.
According to the embodiment of the utility model provides a pair of charging voltage acquisition circuit, through can be between resistance partial pressure sampling circuit and controller, play the opto-coupler isolating circuit with the effective isolation of the low-voltage circuit portion of the high-voltage circuit part of resistance partial pressure sampling circuit and controller, greatly improved charging voltage acquisition circuit's interference killing feature, guaranteed charging voltage acquisition circuit reliable and stable work under more complicated power supply condition. Meanwhile, accurate sampling voltage is fed back to a controller of the charging device very accurately, and instantaneity and accuracy of overvoltage protection are guaranteed. The realization avoids causing the great loss of equipment property and personnel.
Correspondingly, the charging fault diagnosis circuit and the charging device which are required to be used in cooperation with the charging voltage acquisition circuit and are directly or indirectly connected with the charging voltage acquisition circuit, and the extended technical scheme of the charging fault diagnosis circuit and the charging device can also have the technical effects.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a charging voltage acquisition circuit according to an embodiment of the present invention;
fig. 2 is a circuit topology diagram of a resistance voltage-dividing sampling circuit according to an embodiment of the present invention;
fig. 3 is a circuit topology diagram of an opto-isolator circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a charging voltage acquisition circuit according to another embodiment of the present invention;
fig. 5 is a circuit topology diagram of a signal amplification circuit according to an embodiment of the present invention;
fig. 6 is a circuit topology diagram of a resistance voltage division sampling circuit and an optical coupling isolation circuit according to an embodiment of the present invention;
fig. 7 is a circuit topology diagram of a signal amplification circuit according to another embodiment of the present invention;
fig. 8 is a schematic block diagram of a charging fault diagnosis circuit according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a charging device according to an embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. The same reference numerals denote the same or similar structures in the drawings, and thus detailed descriptions thereof will be omitted. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The directional terms appearing in the following description are directions shown in the drawings, and do not limit the specific structure of the dc charging harness, the electrical connection assembly, and the charging port assembly of the present invention. In the description of the present invention, it should also 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; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as the case may be, by those of ordinary skill in the art.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. Embodiments will be described in detail below with reference to the accompanying drawings.
In some cases, in order to ensure the safety of personnel and equipment, an overvoltage protection mechanism exists in a high-power charging device during high-power charging, but in the process of sampling by adopting resistance voltage division and then sending the sampling to a controller for charging voltage sampling, potential safety hazards exist in the middle connection part of a high-voltage circuit and a low-voltage circuit due to the fact that a high-voltage sampling unit and a control unit are not isolated. Accurate devices such as chips in the circuit are easily interfered, and sampled voltage values are easily interfered to cause overlarge sampling value deviation, so that protection misoperation or action is not timely.
It should be noted that the charging device of the embodiment of the present invention can be applied to charging various devices that can be charged, such as an electric vehicle, an electric aircraft, and an electric ship. For convenience of explanation, the embodiment of the present invention will be described below by taking an electric vehicle and a charging pile as examples.
Based on the problem, the embodiment of the utility model provides a charging voltage acquisition circuit can guarantee the charging voltage of charging voltage collection and failure diagnosis's accuracy to guarantee to fill electric pile and can in time handle the excessive pressure trouble and avoid the malfunction.
Fig. 1 is a schematic structural diagram of a charging voltage acquisition circuit according to an embodiment of the present invention. As shown in fig. 1, a charging voltage collecting circuit 100 for collecting a charging voltage during a charging process of a high-power charging device and determining a fault condition of the charging device according to the charging voltage may include:
the resistance voltage division sampling circuit 110 is connected with the voltage output end of the charging device and is used for collecting the charging voltage output by the charging device when the charging device charges a charged object;
the optical coupling isolation circuit 120 is connected with the output end of the resistance voltage division sampling circuit;
the output end of the optical coupling isolation circuit 120 sends the processed charging voltage signal to the controller through the analog-to-digital conversion circuit, so that the controller can judge the fault condition of the charging device according to the charging voltage signal.
It should be noted that the sampling resistor in the resistor voltage-dividing sampling circuit 110 may be a high-precision resistor with a small tolerance of resistance value and a stable resistance value, so as to meet the requirement of accurate sampling.
The optical coupler isolation circuit 120 is an optical coupler for isolating the circuit. The optical coupling isolation circuit ensures that the two isolated circuits are not electrically and directly connected, and mainly prevents interference caused by the electrical connection, particularly between a low-voltage control circuit and an external high-voltage circuit.
In some examples, under the action of the optical coupling isolation circuit 120, the controller can obtain a relatively accurate charging voltage value under the condition of avoiding interference, so that the controller can subsequently and accurately perform a series of processing actions such as comparing the charging voltage value, judging and alarming.
According to the embodiment of the utility model provides a pair of charging voltage acquisition circuit, through can be between resistance partial pressure sampling circuit and controller, play the opto-coupler isolating circuit with the effective isolation of the low-voltage circuit portion of the high-voltage circuit part of resistance partial pressure sampling circuit and controller, greatly improved charging voltage acquisition circuit's interference killing feature, guaranteed charging voltage acquisition circuit reliable and stable work under more complicated power supply condition. Meanwhile, accurate sampling voltage is fed back to a controller of the charging device very accurately, and instantaneity and accuracy of overvoltage protection are guaranteed. The realization avoids causing the great loss of equipment property and personnel.
Fig. 2 is a circuit topology diagram of a resistance voltage-dividing sampling circuit according to an embodiment of the present invention. As shown in fig. 2, in a specific resistance-divided sampling circuit, the HVin + and HVin-terminals of the resistance-divided sampling circuit are connected to the charging voltage of the charging device. A sampling resistor RS in the resistor voltage division sampling circuit adopts a high-precision resistor with small tolerance of resistance value and stable resistance value, and a sampling result is obtained according to the voltage values of SV + and SV-at two ends of the resistor RS.
Fig. 3 is a circuit topology diagram of an optical coupler isolation circuit according to an embodiment of the present invention. As shown in fig. 3, the optical coupling isolation circuit can adopt an ACPL-C790 device as an optical coupling device. And, in order to reduce the clutter signal of the collected voltage, in some examples, the optical coupling isolation circuit further includes a filter circuit, and the filter circuit includes a capacitor connected in parallel across a sampling resistor of the resistor voltage division sampling circuit. As in FIG. 3, the filter circuit described above may employ capacitors placed between the voltage acquisition points of SV + and SV-. And the output end of the optocoupler sends the obtained voltages V + and V-to the controller through an analog-to-digital conversion circuit, so that the controller judges the fault condition of the charging device according to the charging voltage signal.
In some examples, to further ensure accuracy of the charging voltage signal acquisition, the charging voltage acquisition circuit may further include: a signal amplifying circuit. Fig. 4 is a schematic structural diagram of a charging voltage acquisition circuit according to another embodiment of the present invention. As shown in fig. 4, the signal amplifying circuit 130 may be connected to an output end of the optical coupler isolation circuit, and configured to stably amplify an output voltage signal of the optical coupler isolation circuit. And a charging voltage sampling signal transmitted by the optical coupling isolation circuit is stably amplified and then sent to an analog-digital conversion circuit. Therefore, the controller can carry out judgment and subsequent protection actions according to the sampling voltage output by the analog-to-digital conversion circuit.
Fig. 5 is a circuit topology diagram of a signal amplification circuit according to an embodiment of the present invention. As shown in fig. 5, the signal amplifying circuit can be a triple-operational differential amplifier, which is a special differential amplifier with ultra-high input impedance, extremely good common-mode rejection ratio, low input offset, and low output impedance, and can amplify signals under common-mode voltage. In some examples, the REF pin of the signal amplification circuit is tied in a boost voltage to make the analog-to-digital converted input voltage signal positive. The signal amplification circuit not only can stably amplify the output voltage signal of the optical coupling isolation circuit, but also can make up the defect that the existing charging voltage acquisition circuit cannot meet the requirement of reverse negative voltage acquisition of a battery. The REF terminal can be connected to a boost voltage, and the output voltage ADCv1 can be calculated by the formula ADCv1 ═ a × [ (V +) - (V-) ] + VREF. Thus, it is also possible to keep the ADCv1 at a positive voltage relative to ground when the battery is reverse connected for sampling by the analog-to-digital conversion circuit.
According to some embodiments, the optical coupling isolation circuit described above may employ any one of ACPL-C790, ACPL-C870, and AMC1311 optical coupling isolators. The signal amplifying circuit can be any one of a three-operational amplifier differential amplifying circuit or an integrated single-power instrument amplifier.
Fig. 6 is a circuit topology diagram of a resistance voltage division sampling circuit and an optical coupling isolation circuit according to an embodiment of the present invention; fig. 7 is a circuit topology diagram of a signal amplification circuit according to another embodiment of the present invention; as shown in fig. 6 and 7:
the range of charging voltage measurement (HVin) is-550V to +1000, the range of output voltage of the charging voltage acquisition circuit is-103 mv to 188mv, the optocoupler isolator can adopt ACPL-C790 optocoupler isolator, and a voltage range can be provided from-861 mv to 1577 mv. The amplification factor of a three-operational-amplifier differential amplifier is designed to be 1.2 times, the operational amplifier can be built by a four-operational amplifier LM324 with differential input, an integrated single-power instrument amplifier such as an AD623 can also be adopted, and meanwhile, the voltage is boosted at a REF pin by 1.2V, so that the output voltage range of a charging voltage acquisition circuit can be from 0.2V to 3.1V relative to the ground, and the output voltage range can be acquired and processed by an analog-to-digital conversion interface of a controller.
Fig. 8 is a schematic structural diagram of a charging failure diagnosis circuit according to an embodiment of the present invention. As shown in fig. 8, an embodiment of the present invention provides a charging fault diagnosis circuit 800, further including the charging voltage acquisition circuit 100; and a controller 810, the controller 810 may be configured to determine a fault condition of the charging device according to the charging voltage signal obtained by the charging voltage acquisition circuit.
According to the embodiment of the utility model provides a pair of charging fault diagnosis circuit, through can be between resistance partial pressure sampling circuit and controller, play the opto-coupler isolating circuit with the effective isolation of the low-voltage circuit portion of the high-voltage circuit part of resistance partial pressure sampling circuit and controller, greatly improved charging voltage acquisition circuit's interference killing feature, guaranteed the reliable and stable work of charging voltage acquisition circuit under more complicated power supply condition. Meanwhile, accurate sampling voltage is fed back to a controller of the charging device very accurately, and instantaneity and accuracy of overvoltage protection are guaranteed. The realization avoids causing the great loss of equipment property and personnel.
In some examples, the controller 810 may be configured to compare the charging voltage signal obtained by the charging voltage acquisition circuit with a preset value at predetermined time intervals, and determine that the charging circuit has an overvoltage charging fault when the charging voltage signal is greater than or equal to the preset value.
For example: the current battery voltage is sampled in real time by the resistor voltage division sampling circuit, a voltage signal is transmitted to the input end of the signal amplification circuit through the optical coupling isolation circuit, the signal amplification circuit linearly amplifies the signal and transmits the signal to the controller, the controller compares the real-time sampling value with the real-time sampling value according to the reference value in real time, and when the preset time interval, for example, the real-time sampling value of 50ms is larger than or equal to the reference value, the charging circuit is judged to have the overvoltage charging fault.
In some examples, the controller 810 may be configured to compare the charging voltage signal obtained by the charging voltage collecting circuit with a preset value at predetermined time intervals, and determine that there is an over-voltage charging fault notification and issue an over-voltage charging fault warning signal when the charging voltage signal is greater than or equal to the preset value. That is to say, when the controller determines that the charging circuit has an overvoltage charging fault, an overvoltage charging fault alarm signal is sent out and an overvoltage protection action is triggered, so that the direct current charging device or the battery is prevented from being damaged to cause loss, and meanwhile, the function of reverse connection and the same protection on the battery are achieved.
Fig. 9 is a schematic structural diagram of a charging device according to an embodiment of the present invention. As shown in fig. 9, an embodiment of the present invention provides a charging device 900, which may include the charging failure diagnosis circuit 800.
According to the embodiment of the utility model provides a pair of charging device through can be between resistance partial pressure sampling circuit and controller, plays the opto-coupler isolating circuit who effectively keeps apart the high-voltage circuit part of resistance partial pressure sampling circuit and the low-voltage circuit portion of controller, has greatly improved charging voltage acquisition circuit's interference killing feature, has guaranteed the reliable and stable work of charging voltage acquisition circuit under the more complicated power supply condition. Meanwhile, accurate sampling voltage is fed back to a controller of the charging device very accurately, and instantaneity and accuracy of overvoltage protection are guaranteed. The realization avoids causing the great loss of equipment property and personnel.
The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Also, different features that are present in different embodiments may be combined to advantage. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art upon studying the drawings, the specification, and the claims.
Claims (10)
1. The utility model provides a charging voltage acquisition circuit for gather charging voltage in charging device charging process and according to charging voltage judges charging device's fault conditions, include:
the resistance voltage division sampling circuit is connected with the voltage output end of the charging device and is used for collecting the charging voltage output by the charging device when the charging device charges a charged object;
the optical coupling isolation circuit is connected with the output end of the resistance voltage division sampling circuit;
the output end of the optical coupling isolation circuit sends the processed charging voltage signal to a controller through an analog-to-digital conversion circuit, so that the controller judges the fault condition of the charging device according to the charging voltage signal.
2. The charging voltage acquisition circuit of claim 1, wherein the optical coupling isolation circuit can adopt any one of an ACPL-C790, an ACPL-C870 and an AMC1311 optical coupling isolator.
3. The charging voltage acquisition circuit of claim 1, further comprising:
and the signal amplification circuit is connected with the output end of the optical coupling isolation circuit and is used for stably amplifying the output voltage signal of the optical coupling isolation circuit.
4. The charging voltage acquisition circuit of claim 3, wherein the signal amplification circuit is a triple operational amplifier differential amplification circuit or an integrated single power supply instrumentation amplifier.
5. The charging voltage acquisition circuit of claim 4, wherein the optocoupler isolation circuit further comprises a filter circuit comprising a capacitor connected in parallel across a sampling resistor of the resistor divider sampling circuit.
6. The charging voltage acquisition circuit of claim 1, wherein the REF pin of the signal amplification circuit is connected to a boost voltage to make the analog-to-digital converted input voltage signal positive.
7. A charging fault diagnosis circuit for acquiring a charging voltage during a charging process of a charging device and judging a fault condition of the charging device according to the charging voltage, comprising the charging voltage acquisition circuit of any one of claims 1 to 6; and the number of the first and second groups,
and the controller is used for judging the fault condition of the charging device according to the charging voltage signal obtained by the charging voltage acquisition circuit.
8. The charging fault diagnosis circuit according to claim 7, wherein the controller is configured to compare the charging voltage signal obtained by the charging voltage acquisition circuit with a preset value at predetermined time intervals, and determine that the charging circuit has the overvoltage charging fault when the charging voltage signal is greater than or equal to the preset value.
9. The charging fault diagnostic circuit of claim 7,
the controller is used for comparing the charging voltage signal obtained by the charging voltage acquisition circuit with a preset value at intervals of preset time, and when the charging voltage signal is greater than or equal to the preset value, judging that an overvoltage charging fault report exists in the charging circuit and sending an overvoltage charging fault alarm signal.
10. A charging device, comprising: the charge fault diagnostic circuit of claim 9.
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| CN201821351686.9U CN210128995U (en) | 2018-08-21 | 2018-08-21 | Charging voltage acquisition circuit, charging fault diagnosis circuit and charging device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111654088A (en) * | 2020-06-23 | 2020-09-11 | 北京迈世高科电子技术有限公司 | Time-sharing voltage acquisition method applied to battery balancing instrument |
| CN112305445A (en) * | 2020-09-28 | 2021-02-02 | 南京迪沃航空技术有限公司 | High-voltage charging detection circuit and equalization control protection system with same |
| CN114113764A (en) * | 2021-11-03 | 2022-03-01 | 浙江吉利控股集团有限公司 | High-voltage sampling circuit and method |
-
2018
- 2018-08-21 CN CN201821351686.9U patent/CN210128995U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111654088A (en) * | 2020-06-23 | 2020-09-11 | 北京迈世高科电子技术有限公司 | Time-sharing voltage acquisition method applied to battery balancing instrument |
| CN112305445A (en) * | 2020-09-28 | 2021-02-02 | 南京迪沃航空技术有限公司 | High-voltage charging detection circuit and equalization control protection system with same |
| CN114113764A (en) * | 2021-11-03 | 2022-03-01 | 浙江吉利控股集团有限公司 | High-voltage sampling circuit and method |
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Denomination of utility model: Charging voltage acquisition circuit, charging fault diagnosis circuit and charging device Effective date of registration: 20201027 Granted publication date: 20200306 Pledgee: Beijing good faith financing Company limited by guarantee Pledgor: TOWATT ENERGY TECHNOLOGY Co.,Ltd. Registration number: Y2020990001256 |
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