Broken line detection circuit for sampling line of energy storage system
By using a detection circuit consisting of a first resistor, a diode, and a current sensing amplifier in the energy storage system, the problems of complexity in sampling line detection and low accuracy in high-voltage systems are solved, realizing open-circuit detection without isolation circuits and ensuring the sampling accuracy and safety of the system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-03-17
AI Technical Summary
Existing methods for detecting sampling lines in energy storage systems are complex and have low sampling accuracy and safety in high-voltage systems, especially when isolation circuits are not used.
A detection circuit consisting of a first resistor, a diode, a second resistor, and a current sensing amplifier is used. By connecting the sampling line to both ends of the diode, the voltage difference is collected by the current sensing amplifier to determine whether the sampling line is broken.
It achieves simple sampling line breakage detection, avoiding the need to add isolation circuits and maintaining the system's sampling accuracy and security.
Smart Images
Figure CN224005236U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of new energy storage technology, specifically to a sampling line breakage detection circuit for an energy storage system. Background Technology
[0002] In high-power devices such as energy storage, sampling circuits such as shunts and Hall effect sensors are widely used. These sampling circuits require sampling lines for connection. The quality of these sampling lines is crucial for reliable data acquisition. Currently, testing the functionality of sampling lines is complex, sometimes requiring redundant circuitry for open-circuit sampling tests. Furthermore, in high-voltage systems, isolated sampling is necessary, further complicating open-circuit detection and significantly reducing sampling accuracy and safety. Utility Model Content
[0003] To address the shortcomings of existing technologies, this invention proposes a simple energy storage system sampling line breakage detection circuit that requires no additional isolation circuitry.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a sampling line disconnection detection circuit for an energy storage system, wherein the sampling line includes a first sampling line and a second sampling line, the detection circuit is located on the high-voltage side, a shunt is provided on the high-voltage side, one end of the first sampling line and the second sampling line are respectively connected to the two ends of the shunt, the sampling line disconnection detection circuit for the energy storage system includes a first resistor, a diode, a second resistor and a current sensing amplifier connected in series, wherein a power supply is connected between the first resistor and the current sensing amplifier, the other ends of the first sampling line and the second sampling line are respectively connected to the two ends of the diode, the two input terminals of the current sensing amplifier are respectively connected to the two ends of the diode, a ground terminal is provided on the connection between the second resistor and the current sensing amplifier, and the output terminal of the current sensing amplifier is connected to an isolation device located on the low-voltage side.
[0005] Furthermore, the first resistor is a high-resistance resistor, and the second resistor is a low-resistance resistor.
[0006] The resistance of the first resistor is greater than 500 kilohms.
[0007] The beneficial effects of this invention are as follows: In this invention, two sampling lines are connected to the two ends of a diode, and the voltage difference across the diode is collected by a current sensing amplifier. A detection circuit consisting of a first resistor, a diode, a second resistor, and a current sensing amplifier connected in series is used. When the first sampling line is broken, the second sampling line is broken, or both the first and second sampling lines are broken simultaneously, a current loop is formed from the first resistor, diode, and second resistor to the ground terminal. At this time, the voltage difference detected at the output terminal of the current sensing amplifier from the isolation device is the voltage drop across the diode. This voltage drop is much greater than the voltage at the maximum current of the shunt, thus indicating a broken sampling line. This invention achieves sampling line breakage detection through simple circuit design, without the need for additional isolation breakage analysis circuits, and does not affect the system's own sampling and accuracy. Attached Figure Description
[0008] Figure 1 This is a schematic diagram of the present invention. Detailed Implementation
[0009] like Figure 1 As shown, in this invention, the sampling line includes a first sampling line a and a second sampling line b. The detection circuit is located on the high-voltage side 1, where a shunt 2 is installed. One end of the first sampling line a and the second sampling line b are respectively connected to the two ends of the shunt 2. The energy storage system sampling line disconnection detection circuit includes a first resistor R1, a diode D1, a second resistor R2, and a current sensing amplifier U connected in series. A power supply (Power) is connected between the first resistor R1 and the current sensing amplifier U. The other ends of the first sampling line a and the second sampling line b are respectively connected to the two ends of the diode D1. The two input terminals of the current sensing amplifier U are respectively connected to the two ends of the diode D1. A ground terminal (GND) is provided on the connection between the second resistor R2 and the current sensing amplifier U. The output terminal of the current sensing amplifier U is connected to an isolation device 4 located on the low-voltage side 3. The first resistor R1 is a high-resistance resistor, and the second resistor R2 is a low-resistance resistor. The resistance of the first resistor R1 is higher than 500 kΩ.
[0010] Let the input voltages of the current sensing amplifier be U1 and U2, and the output be ΔU, then ΔU = U1 - U2. In this embodiment, the maximum current of the shunt is set to 140A.
[0011] When the sampling line is connected correctly, according to Kirchhoff's laws, the sampling current is the current through the first resistor R1 and the current through the shunt. Since the first resistor R1 is large enough, it will not affect the sampling process. The system operates normally.
[0012] When the first sampling line a is disconnected, the current loop is from the first resistor R1, diode D1 to the ground terminal GND. At this time, ΔU is the diode voltage drop, which is greater than 400mV, much greater than the voltage when the shunt is at its maximum current, so it can be determined that the line is disconnected.
[0013] When the second sampling line b is disconnected, the current loop is from the first resistor R1, diode D1 to the ground terminal GND. At this time, ΔU is the diode voltage drop, which is greater than 400mV, much greater than the voltage when the shunt 2 is at its maximum current, so it can be judged that the line is disconnected.
[0014] When both the first sampling line a and the second sampling line b are disconnected, the current loop is from the first resistor R1, the diode D1 to the ground terminal GND. At this time, ΔU is the diode voltage drop, which is greater than 400mV, much greater than the voltage when the shunt is at its maximum current, so it can be determined that the circuit is disconnected.
[0015] The above description is only the optimal solution embodiment of this utility model and is not intended to limit this utility model. Various modifications or substitutions made by those skilled in the art to this utility model without departing from the essence and protection scope of this utility model should also be within the protection scope of this utility model.
Claims
1. An energy storage system sampling line break detection circuit, wherein, The sampling line comprises a first sampling line (a) and a second sampling line (b), the detection circuit is arranged on a high-voltage side (1), a shunt (2) is arranged on the high-voltage side (1), one end of the first sampling line (a) and the second sampling line (b) is respectively connected to two ends of the shunt (2), and the energy storage system sampling line breakage detection circuit is characterized in that: the energy storage system sampling line breakage detection circuit comprises a first resistor (R1), a diode (D1), a second resistor (R2) and a current sensing amplifier (U) connected in series, wherein a power supply (Power) is connected between the first resistor (R1) and the current sensing amplifier (U), the other end of the first sampling line (a) and the second sampling line (b) is respectively connected to two ends of the diode (D1), two input ends of the current sensing amplifier (U) are respectively connected to two ends of the diode (D1), a grounding end (GND) is arranged on a connecting path of the second resistor (R2) and the current sensing amplifier (U), and an output end of the current sensing amplifier (U) is connected to an isolation device (4) located on a low-voltage side (3).
2. The energy storage system broken sampling line detection circuit of claim 1, wherein: The first resistor (R1) is a high-resistance resistor, and the second resistor (R2) is a low-resistance resistor.
3. The energy storage system sampling line break detection circuit of claim 2, wherein: The resistance value of the first resistor (R1) is higher than 500 kΩ.