一种电流监测设备
By combining sampling resistors, switches, delay units, voltage regulators, voltage divider circuits, and comparators, the problems of large size, high cost, and susceptibility to external magnetic field interference in existing current monitoring devices are solved, realizing portable, low-power, multi-level current monitoring and ensuring circuit safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- KEBA IND AUTOMATION (SHANGHAI) CO LTD
- Filing Date
- 2025-07-22
- Publication Date
- 2026-07-17
AI Technical Summary
Existing current monitoring devices are bulky, costly, and susceptible to interference from external magnetic fields, making it difficult to achieve portable and power-intensive current monitoring.
By employing a combination of sampling resistors, switches, delay units, voltage regulators, voltage divider circuits, and comparators, multi-level current signal monitoring is achieved. The current signal is converted into a voltage signal using a precision sampling resistor, and a reference voltage is provided by the voltage regulator and voltage divider circuit. The voltage is then compared using a comparator, thus realizing multi-level current monitoring.
It enables portable, low-power, multi-level current signal monitoring and can issue a shutdown signal when the current exceeds the set range to protect the circuit under test.
Smart Images
Figure CN224518832U_ABST
Abstract
Claims
1. A current monitoring device, characterized by, include: Sampling resistor, switch, at least one delay unit, voltage regulator and voltage divider circuit, at least one comparator; One end of the sampling resistor is connected to the current input terminal, and the other end is connected to the switch; The switch is connected to the delay unit, the delay unit is connected to the negative input terminal of the comparator, and the switch is used to select the delay unit and the comparator; The output of the voltage regulator and voltage divider circuit is connected to the positive input of the comparator, and the output of the comparator is connected to an external circuit.
2. The current monitoring device of claim 1, wherein, The number of delay units is the same as the number of comparators.
3. The current monitoring device of claim 2, wherein, The switches simultaneously select one delay unit.
4. The current monitoring device of claim 1, wherein, The voltage regulator and voltage divider circuit includes a voltage regulator and multiple voltage divider resistors; The voltage regulator is connected in series with the first voltage divider resistor and is connected to the power supply. The voltage regulator and the first voltage divider resistor share the power supply voltage equally. One end of the second voltage divider resistor is connected to the negative terminal of the voltage regulator, and the other end is connected to the positive input terminal of the comparator; The third voltage divider resistor is connected in series with the second voltage divider resistor to the voltage regulator.
5. The current monitoring device of claim 4, wherein, The voltage at the positive input terminal of the comparator is in the mV range, and the output terminal of the comparator is connected to an MCU or an alarm device.
6. The current monitoring device of claim 4, wherein, A filter capacitor is connected between the power supply and the positive input terminal of the comparator to stabilize the voltage level entering the comparator.
7. The current monitoring device of claim 1, wherein, The sampling resistor is 5 milliohms.
8. The current monitoring device of claim 1, wherein, It includes three delay units, each configured with different delay parameters.