Sampling circuit of integrated chip

Abstract

The utility model discloses a sampling circuit of an integrated chip. The isolation current integrated chip and the isolation voltage integrated chip are used for replacing the operation that an operational amplifier chip needs to be matched to amplify voltage and current signals in an existing sampling circuit and the operation that a comparator chip needs to be matched to conduct level overturning when hardware overcurrent protection is triggered abnormally. According to the utility model, two integrated chips are adopted to reduce configuration elements of the circuit, so that the circuit layout is simple and the cost is low; and meanwhile, the risk of electromagnetic compatibility is reduced, the anti-interference capability is improved, and the acquired voltage and current signals are accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of sampling circuits, in particular to a sampling circuit of an integrated chip. Background Art

[0002] In the ADC (Analog-to-Digital Converter) circuit, the voltage and current signals are collected. The existing technology uses the NSi1200-Q1SWVR isolated current sampling chip and the NSI1311-Q1SWVR isolated voltage sampling chip. Since these two chips are non-integrated chips, they need to be used in the sampling circuit with an op amp chip to amplify the voltage and current signals and then send them to the ADC for sampling. Utility Model Content

[0003] The technical problem to be solved by the utility model is that the existing sampling circuit has a complex structure and high cost; there is a risk of electromagnetic compatibility and low anti-interference ability, which leads to inaccurate collected voltage and current signals. A sampling circuit of an integrated chip is provided.

[0004] The utility model solves the above technical problems through the following technical solutions:

[0005] The utility model provides a sampling circuit of an integrated chip. The sampling circuit comprises: an IGBT control circuit, an isolation current sampling circuit, an isolation voltage sampling circuit and a single chip microcomputer;

[0006] The IGBT control circuit is connected to the isolation current sampling circuit;

[0007] The isolated voltage sampling circuit is connected to the high voltage electrode;

[0008] The isolation current sampling circuit and the isolation voltage sampling circuit are respectively connected to the single chip microcomputer.

[0009] Preferably, the isolated current sampling circuit includes an isolated current integrated chip, a power supply circuit and a current filtering circuit;

[0010] The power supply circuit and the current filter circuit are respectively connected to the isolation current integrated chip;

[0011] The current filter circuit is connected to the first AD sampling channel of the single chip microcomputer.

[0012] Preferably, the isolation current integrated chip adopts the isolation current integrated chip model NSM2016.

[0013] Preferably, the isolated voltage sampling circuit includes a high voltage sampling circuit, an isolated voltage integrated chip, a low voltage power supply circuit and a voltage filtering circuit;

[0014] The low-voltage power supply circuit and the high-voltage sampling circuit are respectively connected to the isolation voltage integrated chip;

[0015] The high voltage sampling circuit is connected to the voltage filtering circuit;

[0016] The voltage filter circuit is connected to the second AD sampling channel of the single chip microcomputer.

[0017] Preferably, the isolation voltage integrated chip adopts NSI1312S isolation voltage integrated chip.

[0018] The positive progress of the utility model is that the utility model provides a sampling circuit of an integrated chip. The isolation current integrated chip and the isolation voltage integrated chip replace the operation of amplifying the voltage and current signals in the existing sampling circuit with the operation amplifier chip and the operation of level flipping with the comparator chip when an abnormality triggers the hardware overcurrent protection. The utility model uses two integrated chips to reduce the configuration elements of the circuit, making the circuit layout simple and low-cost; at the same time, it reduces the risk of electromagnetic compatibility, improves the anti-interference ability, and makes the collected voltage and current signals accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a module schematic diagram of a sampling circuit according to an embodiment of the utility model.

[0020] Figure 2 It is a module schematic diagram of the isolated current sampling circuit according to an embodiment of the utility model.

[0021] Figure 3 It is a module schematic diagram of the isolated voltage sampling circuit according to an embodiment of the utility model.

[0022] Legend: 1. IGBT control circuit; 2. Isolated current sampling circuit; 3. Isolated voltage sampling circuit; 4. Isolated current integrated chip; 5. Power supply circuit; 6. Current filter circuit; 7. High-voltage sampling circuit; 8. Isolated voltage integrated chip; 9. Low-voltage power supply circuit; 10. Voltage filter circuit; 11. High-voltage power supply circuit; 12. High-voltage electrode; 13. Single-chip microcomputer. DETAILED DESCRIPTION

[0023] The present invention is further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments.

[0024] Example

[0025] like Figure 1As shown, this embodiment provides a sampling circuit of an integrated chip. The sampling circuit includes: an IGBT control circuit 1, an isolated current sampling circuit 2, an isolated voltage sampling circuit 3 and a single-chip microcomputer 13; the IGBT control circuit 1 is connected to the isolated current sampling circuit 2; the isolated voltage sampling circuit 3 is connected to the high-voltage electrode 12; the isolated current sampling circuit 2 and the isolated voltage sampling circuit 3 are respectively connected to the single-chip microcomputer 13.

[0026] like Figure 2 As shown, in this embodiment, the isolated current sampling circuit 2 includes an isolated current integrated chip 4, a power supply circuit 5 and a current filter circuit 6; the power supply circuit 5 and the current filter circuit 6 are respectively connected to the isolated current integrated chip 4; the current filter circuit 6 is connected to the first AD sampling channel of the single-chip microcomputer 13. Specifically, the power supply circuit 5 is used to provide a 5V power supply signal for the isolated current integrated chip 4; the current filter circuit 6 is used to filter the more accurate current signal collected by the isolated current integrated chip 4, filter out the signal affected by electromagnetic compatibility in the current signal according to a specific band frequency, and improve the anti-interference ability of the sampling circuit; the filtered current signal is transmitted to the first AD sampling channel of the connected single-chip microcomputer 13 for sampling.

[0027] In this embodiment, the isolated current integrated chip 4 adopts the NSM2016 isolated current integrated chip. Specifically, the NSM2016 isolated current integrated chip is a fully integrated high isolation current sensor chip with extremely low primary side on-resistance. It can provide sufficiently accurate current measurement without the need for external amplifier components, so that the current signal collected by the sampling circuit is accurate, ensuring the accuracy of sampling by the sampling circuit; the NSM2016 isolated current integrated chip does not need to be connected to an operational amplifier circuit in the circuit to amplify the current signal, and can be directly sampled internally to AD, with a simple circuit design and low design cost; the NSM2016 isolated current integrated chip also has overcurrent protection to protect the components in the circuit from being damaged by overcurrent.

[0028] like Figure 3As shown, in this embodiment, the isolated voltage sampling circuit 3 includes a high-voltage sampling circuit 7, an isolated voltage integrated chip 8, a low-voltage power supply circuit 9 and a voltage filter circuit 10; the low-voltage power supply circuit 9 and the high-voltage sampling circuit 7 are respectively connected to the isolated voltage integrated chip 8; the high-voltage sampling circuit 7 is connected to the voltage filter circuit 10; and the voltage filter circuit 10 is connected to the second AD sampling channel of the single-chip computer 13. Specifically, the isolated voltage sampling circuit 3 also includes a high-voltage power supply circuit 11, which is used to provide a high-voltage power supply signal for the isolated voltage integrated chip 8; the low-voltage power supply circuit 9 is used to provide a low-voltage power supply signal for the isolated voltage integrated chip 8; the high-voltage sampling circuit 7 is used to further sample the voltage signal collected by the isolated voltage integrated chip 8 with high precision, so as to obtain a voltage signal with higher precision; the voltage filter circuit 10 is used to filter the collected high-precision voltage signal, and filter out the voltage signal affected by electromagnetic compatibility in the voltage signal according to a specific band frequency, thereby improving the anti-interference ability of the sampling circuit; and the filtered voltage signal is transmitted to the second AD sampling channel of the connected single-chip computer 13 for sampling.

[0029] In this embodiment, the isolated voltage integrated chip 8 adopts the NSI1312S isolated voltage integrated chip. Specifically, the NSI1312S isolated voltage integrated chip does not need to be matched with an operational amplifier circuit in the circuit to amplify the collected voltage signal and then transmit it to the AD channel for sampling, and can be directly connected to the AD sampling channel of the single-chip microcomputer; this embodiment uses the NSI1312S isolated voltage integrated chip to replace the operational amplifier circuit, so that the sampling circuit structure design is simple and the design cost is low.

[0030] This embodiment provides a sampling circuit of an integrated chip. The isolation current integrated chip and the isolation voltage integrated chip replace the existing sampling circuit that needs to cooperate with the op amp chip to amplify the voltage and current signals, and the operation that needs to cooperate with the comparator chip to perform level flipping when an abnormality triggers the hardware overcurrent protection. The utility model uses two integrated chips to reduce the configuration elements of the circuit, making the circuit layout simple and low-cost; at the same time, it reduces the risk of electromagnetic compatibility, improves the anti-interference ability, and makes the collected voltage and current signals accurate.

[0031] The working principle of the utility model is: the IGBT control circuit 1 is connected to the isolation current sampling circuit 2, the isolation current integrated chip 4 in the isolation current sampling circuit 2 is used to collect the current signal of the IGBT control circuit 1, and then the current signal affected by electromagnetic compatibility is filtered out through the current filter circuit 6, and sent to the first AD sampling channel of the single-chip computer 13; the isolation voltage sampling circuit 3 is connected to the high-voltage electrode 12, the isolation voltage integrated chip 8 in the isolation voltage sampling circuit 3 is used to collect the voltage signal of the IGBT control circuit 1, and then the voltage signal affected by electromagnetic compatibility is filtered out through the voltage filter circuit 10, and sent to the second AD sampling channel of the single-chip computer 13. The utility model adopts two integrated chips to reduce the configuration components of the circuit, making the circuit layout simple and low-cost; at the same time, it reduces the risk of electromagnetic compatibility, improves the anti-interference ability, and makes the collected voltage and current signals accurate.

[0032] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A sampling circuit of an integrated chip, characterized in that: The sampling circuit comprises: an IGBT control circuit, an isolation current sampling circuit, an isolation voltage sampling circuit and a single chip microcomputer; The IGBT control circuit is connected to the isolation current sampling circuit; The isolated voltage sampling circuit is connected to the high voltage electrode; The isolation current sampling circuit and the isolation voltage sampling circuit are respectively connected to the single chip microcomputer.

2. The sampling circuit of the integrated chip as claimed in claim 1, characterized in that: The isolated current sampling circuit includes an isolated current integrated chip, a power supply circuit and a current filtering circuit; The power supply circuit and the current filter circuit are respectively connected to the isolation current integrated chip; The current filter circuit is connected to the first AD sampling channel of the single chip microcomputer.

3. The sampling circuit of the integrated chip as claimed in claim 2, characterized in that: The isolation current integrated chip adopts the NSM2016 isolation current integrated chip.

4. The sampling circuit of the integrated chip as claimed in claim 1, characterized in that: The isolated voltage sampling circuit includes a high voltage sampling circuit, an isolated voltage integrated chip, a low voltage power supply circuit and a voltage filtering circuit; The low-voltage power supply circuit and the high-voltage sampling circuit are respectively connected to the isolation voltage integrated chip; The high voltage sampling circuit is connected to the voltage filtering circuit; The voltage filter circuit is connected to the second AD sampling channel of the single chip microcomputer.

5. The sampling circuit of the integrated chip as claimed in claim 4, characterized in that: The isolation voltage integrated chip adopts the NSI1312S isolation voltage integrated chip.

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