How to usePCB installation of current sensorIt is necessary to focus on the following three aspects in order to maximize the performance of the product, including the layout of primary wires, signal lines, and heat sinks. The reasonable design of these three aspects will affect the performance indicators of the product, the complete transmission of signals, and the service life of the devices.

When arranging current sensors, the circuit board design using a primary wire should be as wide and short as possible to reduce the resistance of the primary conductor, as resistance can cause heating between the primary conductor and the current sensor. The thickness of the conductor layer in PCB board design is usually 0.070 millimeters. This suggestion is to reduce the width of the conductor layer used as the main conductor in an inverse proportion to the quantity. It is recommended to use grounding when designing the conductor. A layout with wide and short wires can also effectively reduce stray inductance and capacitance. These stray parameters can cause delays in the current waveform, which may result in poor controllability of the inverter system.

Suggest drawing the trace of the wire straight from left to right (see Figure 3a). Due to the limitations of the board, when it is not possible to draw the trajectory layout from left to right, the trajectory should be drawn towards the other side of the signal pin (Figure 3b). Please note that there is a slight difference in sensitivity between Figure 3a and 3b, with a difference of about 1%. When pulled towards the signal pin direction, the sensitivity of the current sensor will change by up to about 8% due to the interference of bending marks (Figure 3c). This layout is not recommended from the perspective of interfering with signal paths.

Secondly, when designing PCB boards, it is important to consider the direction of current, especially DC signal acquisition, in order to accurately obtain appropriate feedback. The output of Weikewei's STK-616 series will normally increase when the current flows from left to right, and decrease when the current increases and flows from right to left (see Figure 4). However, this relationship does not apply to inverter systems, as the layout of the inverter power supply should be changed once to achieve the opposite direction of current flow.