行业组件数据 · 2026

电流源电路

A precision current source circuit used in ground continuity testers to generate stable test currents for measuring electrical resistance.

技术定义与适配语境
典型 电流源电路 会按材料、尺寸公差、适配关系和失效风险在 电气设备制造 中评估。

The current source circuit is a critical electronic component within ground continuity testers that generates and regulates a precise, stable direct current (DC) output. It typically employs operational amplifiers, precision resistors, and feedback mechanisms to maintain constant current flow regardless of load variations, enabling accurate measurement of ground path resistance in electrical systems and equipment.

组件规格

定义
The current source circuit is a critical electronic component within ground continuity testers that generates and regulates a precise, stable direct current (DC) output. It typically employs operational amplifiers, precision resistors, and feedback mechanisms to maintain constant current flow regardless of load variations, enabling accurate measurement of ground path resistance in electrical systems and equipment.
工作原理
Operates using a closed-loop feedback control system where a reference voltage is applied across a precision sense resistor. The circuit compares the actual current (via voltage drop across the sense resistor) with the setpoint and adjusts the output through transistors or MOSFETs to maintain constant current. Common configurations include Howland current pumps or op-amp-based voltage-to-current converters.
材料
Printed circuit board (FR-4)copper tracessurface-mount resistors (precision ±0.1% or better)operational amplifiers (low-offsetlow-drift)transistors/MOSFETsceramic and electrolytic capacitorsconnectors (gold-plated contacts).
Input Voltage
12-24V DC
Response Time
<10ms
Ripple and Noise
<1% RMS
Current Stability
±0.5% of set value
Output Current Range
1mA to 25A (adjustable)
Operating Temperature
0°C to 50°C
Temperature Coefficient
<50ppm/°C
Output Voltage Compliance
Up to 10V
标准
ISO 9001IEC 61010-1UL 61010-1DIN EN 61326-1

行业分类与别名

电流源电路 的常用贸易名称、技术标识和检索关键词。

上级产品

该组件会出现在以下整机或工业产品中。

FMEA · 风险与缓解

诱因 → 失效模式 → 工程缓解

Aging or overheating of precision resistors->Drift in output current value->Use high-stability, low-temperature-coefficient resistors; implement thermal management; regular calibration checks
Op-amp offset voltage drift->Current output instability or error->Select low-drift, auto-zero op-amps; include trimming circuits; design with negative feedback
Poor solder joints or connector corrosion->Intermittent or loss of current output->Use high-reliability soldering processes; gold-plated connectors; conformal coating for protection

工业生态与工程逻辑

0
Overheating from excessive load
1
Component degradation over time
2
Electrical noise interference
3
Incorrect calibration leading to false readings
4
Short circuit damage

合规与检测

tolerance
Current output tolerance ±1% of full scale, resistance measurement accuracy ±2% ±2 digits
test method
Verification per IEC 61557-4 using calibrated reference resistors; periodic calibration against traceable standards; insulation resistance testing at 500V DC

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制造商列表用于前期研究和供应商能力理解,不代表认证、排名或交易担保。

采购评估维度

不是客户评论,也不是实时热度。以下维度用于前期 RFQ 准备和供应商评估。

技术文档
4/5
制造能力
4/5
可检验性
5/5
供应商透明度
3/5

这些分值是采购评估维度示例,不代表真实客户评分、具体国家买家反馈或实时询盘。

相关组件

常见问题

What is the purpose of the current source circuit in a ground continuity tester?

It provides a stable, known test current that flows through the ground path being tested. By measuring the voltage drop across this path, the tester calculates resistance accurately, ensuring ground connections meet safety standards.

How does temperature affect current source circuit performance?

Temperature variations can cause drift in component values (especially resistors and op-amps), leading to current output errors. High-quality circuits use temperature-compensated components and designs to minimize this effect, typically specified by a low temperature coefficient.

Can this circuit be used for testing both AC and DC systems?

This specific circuit generates DC test currents. Some advanced testers may include AC current sources for specialized applications, but DC is standard for ground continuity testing due to its stability and compatibility with resistance measurement principles.

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URN:CNFX:ME:UNIT:CURRENT_SOURCE_CIRCUIT