CN214473598U - Direct current voltage sampling circuit of all-in-one motor controller - Google Patents
Direct current voltage sampling circuit of all-in-one motor controller Download PDFInfo
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- CN214473598U CN214473598U CN202120118549.6U CN202120118549U CN214473598U CN 214473598 U CN214473598 U CN 214473598U CN 202120118549 U CN202120118549 U CN 202120118549U CN 214473598 U CN214473598 U CN 214473598U
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- 238000005070 sampling Methods 0.000 title claims abstract description 32
- 230000003750 conditioning effect Effects 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 238000002955 isolation Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
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Abstract
The utility model discloses a direct current voltage sampling circuit of all-in-one motor controller, including a plurality of high-pressure detection points, a plurality of high-pressure sampling branch circuits, a multichannel AD converter, a digital isolator and a control unit communication module, the all-in-one motor controller connects the storage battery, the digital isolator includes a plurality of input ends and a plurality of output ends, the high-pressure sampling branch circuit includes a step-down conditioning circuit; the positive input end of the voltage-reducing conditioning circuit is connected with the corresponding high-voltage detection point, and the positive output end of the voltage-reducing conditioning circuit is connected with the positive input end corresponding to the multi-path AD converter; the output ends of the multi-path AD converters are respectively connected with the corresponding input ends of the digital isolators, and the output ends of the digital isolators are respectively connected with the corresponding input ends of the communication modules of the control unit. The utility model has the advantages of few types and quantity of devices, simple structure and small size of the circuit board; the motor controller has low cost and high power density.
Description
Technical Field
The utility model relates to an all-in-one machine controller especially relates to an all-in-one machine controller's direct current voltage sampling circuit.
Background
The motor controller is a key part of the electric vehicle, converts the electric energy stored by the power battery into the electric energy required by the driving motor according to instructions of gears, an accelerator, a brake and the like to control the running states of the electric vehicle such as starting operation, advancing and retreating speed, climbing force and the like, or helps the electric vehicle to brake and stores part of brake energy into the power battery.
The all-in-one controller is usually integrated with a plurality of units, and particularly when a high-voltage Power Distribution Unit (PDU) is integrated, the DC voltage at a plurality of points needs to be sampled and detected. The sampled voltage value is used for participating in control, voltage monitoring, contactor adhesion monitoring and the like. The problem of high-low voltage side isolation required by safety regulations exists due to the sampling of the voltage at the high voltage side. The existing sampling mode mainly realizes the isolated sampling of signals through a linear isolation amplifier. The structure of the sampling circuit is shown in fig. 1, and firstly, a voltage reduction conditioning circuit composed of a resistor and a capacitor converts direct-current high voltage into input voltage matched with a linear isolator. The linear isolator isolates and amplifies the reduced voltage, so that the signal is isolated and transmitted to the low-voltage side. After being conditioned and converted, the voltage signal at the low-voltage side is converted into a signal suitable for the AD sampling module of the low-voltage side control unit for sampling by the control unit. A set of such circuits is required for each DC voltage sampling point to complete sampling.
Since there are many voltage points to be sampled on the all-in-one controller, the voltage to be sampled is close to 10 for a typical all-in-one controller. The cost of the linear isolator is high, and particularly in the case of multi-path sampling, the cost of the sampling circuit is increased remarkably. And each sampling path needs to be isolated by considering, and an isolation zone is reserved, so that the layout of the PCB is seriously influenced, the space utilization rate of the PCB is low, and the power density of the controller is influenced while the size and the cost of the PCB are increased.
Disclosure of Invention
The to-be-solved technical problem of the utility model is to provide a simple structure, the higher all-in-one machine controller's of space utilization of PCB board direct current voltage sampling circuit.
In order to solve the technical problem, the utility model adopts the technical scheme that the direct current voltage sampling circuit of the all-in-one motor controller comprises a plurality of high-voltage detection points, a plurality of high-voltage sampling branches, a multi-path AD converter, a digital isolator and a control unit communication module, wherein the all-in-one motor controller is connected with a storage battery, the digital isolator comprises a plurality of input ends and a plurality of output ends, and the high-voltage sampling branches comprise a voltage reduction conditioning circuit; the positive input end of the voltage-reducing conditioning circuit is connected with the corresponding high-voltage detection point, and the positive output end of the voltage-reducing conditioning circuit is connected with the positive input end corresponding to the multi-path AD converter; the output ends of the multi-path AD converters are respectively connected with the corresponding input ends of the digital isolators, and the output ends of the digital isolators are respectively connected with the corresponding input ends of the communication modules of the control unit.
In the direct-current voltage sampling circuit, the negative input end of the voltage reduction conditioning circuit is connected with the storage battery and is connected with the analog ground; the negative output end of the voltage reduction conditioning circuit is connected with the negative input end corresponding to the multi-path AD converter and is connected with the analog ground; the high-voltage side of the digital isolator is connected with an analog ground, the low-voltage side of the digital isolator is connected with a digital ground, and the communication module of the control unit is connected with the digital ground.
The utility model has the advantages of few types and quantity of devices, simple structure, small size of the circuit board and high space utilization rate; the motor controller has low cost and high power density.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a block diagram of a dc voltage sampling circuit of an all-in-one motor controller in the prior art.
Fig. 2 is a block diagram of the embodiment of the present invention, which illustrates a dc voltage sampling circuit of an all-in-one motor controller.
Detailed Description
The embodiment of the utility model provides an all-in-one machine controller direct current voltage sampling circuit is as shown in figure 2, including a plurality of high-pressure check points, many high-pressure sampling branch roads, multichannel AD converter, digital isolator and the control unit communication mode. The all-in-one motor controller is connected with the storage battery, the digital isolator comprises a plurality of input ends and a plurality of output ends, and the high-voltage sampling branch circuit is a voltage reduction conditioning circuit. The positive input end of the voltage-reducing conditioning circuit is connected with the corresponding high-voltage detection point, and the positive output end of the voltage-reducing conditioning circuit is connected with the corresponding positive input end of the multi-path AD converter. The negative input end of the voltage reduction conditioning circuit is connected with the storage battery and is connected with the analog ground. And the negative output end of the voltage reduction conditioning circuit is connected with the corresponding negative input end of the multi-path AD converter and is connected with the analog ground.
The output ends of the multi-path AD converters are respectively connected with the corresponding input ends of the digital isolators, and the output ends of the digital isolators are respectively connected with the corresponding input ends of the communication modules of the control unit. The high-voltage side of the digital isolator is connected with an analog ground, the low-voltage side of the digital isolator is connected with a digital ground, and the communication module of the control unit is connected with the digital ground.
The direct-current high voltage of each high-voltage detection point is firstly reduced to a proper voltage range through a voltage reduction conditioning circuit according to the requirements of a later-stage multi-channel AD converter. And signals obtained after voltage reduction of all the high-voltage detection points are connected to a unified multi-channel AD converter. The analog voltage signal is converted into a digital signal by a multiplexer AD converter. The communication unit of the multi-channel AD converter is communicated with the communication unit of the main control unit through the digital isolator to realize data interaction, so that analog signals of all high-voltage detection points acquired by the multi-channel AD converter are converted into digital signals to be transmitted to the main control unit. Wherein the isolation section is implemented by a general-purpose digital isolator. The digital isolator is an isolation transmission device of digital signals, a plurality of isolation transmission channels are usually integrated, and a plurality of manufacturers have related standardized products for selection, such as a Si86xxxT multi-channel digital isolator of Silicon Labs or an ISO67xx series digital isolator of TI.
The utility model discloses the many unification machine controller direct current voltage sampling circuit of above embodiment adopts a digital isolator to replace a plurality of linear isolators, and simple structure can save device kind and device quantity, and reduce cost reduces the circuit board size, circuit board space utilization height, improves machine controller's power density.
Claims (2)
1. A direct current voltage sampling circuit of an all-in-one motor controller comprises a plurality of high-voltage detection points and a plurality of high-voltage sampling branches, and the all-in-one motor controller is connected with a storage battery and is characterized by comprising a multi-path AD converter, a digital isolator and a control unit communication module; the digital isolator comprises a plurality of input ends and a plurality of output ends, and the high-voltage sampling branch comprises a voltage reduction conditioning circuit; the positive input end of the voltage-reducing conditioning circuit is connected with the corresponding high-voltage detection point, and the positive output end of the voltage-reducing conditioning circuit is connected with the positive input end corresponding to the multi-path AD converter; the output ends of the multi-path AD converters are respectively connected with the corresponding input ends of the digital isolators, and the output ends of the digital isolators are respectively connected with the corresponding input ends of the communication modules of the control unit.
2. The direct-current voltage sampling circuit of claim 1, wherein the negative input terminal of the buck conditioning circuit is connected with the storage battery and is connected with an analog ground; the negative output end of the voltage reduction conditioning circuit is connected with the negative input end corresponding to the multi-path AD converter and is connected with the analog ground; the high-voltage side of the digital isolator is connected with an analog ground, the low-voltage side of the digital isolator is connected with a digital ground, and the communication module of the control unit is connected with the digital ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120118549.6U CN214473598U (en) | 2021-01-15 | 2021-01-15 | Direct current voltage sampling circuit of all-in-one motor controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120118549.6U CN214473598U (en) | 2021-01-15 | 2021-01-15 | Direct current voltage sampling circuit of all-in-one motor controller |
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| Publication Number | Publication Date |
|---|---|
| CN214473598U true CN214473598U (en) | 2021-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120118549.6U Active CN214473598U (en) | 2021-01-15 | 2021-01-15 | Direct current voltage sampling circuit of all-in-one motor controller |
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| Country | Link |
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| CN (1) | CN214473598U (en) |
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2021
- 2021-01-15 CN CN202120118549.6U patent/CN214473598U/en active Active
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