Mining BMS isolation circuit
By designing an isolation circuit that uses comparator and optocoupler, combining threshold resistance to compare resistance values, and controlling the on or off of optocoupler, the problem of unisolated BMS CC2 circuit for mining is solved, and the safe isolation of the circuit is achieved , reducing development costs.
Patent Information
- Application Number
- CN202323670649.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-30
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2033-12-30
AI Technical Summary
The existing mining BMS CC2 circuit is not isolated, resulting in the inability to effectively isolate the power source ground or the reference ground between the housing and the CC2 circuit, which poses safety risks.
A mining BMS isolation circuit is designed, using the comparator and the optocoupler to combine the threshold resistance, and the optocoupler is controlled by comparing the resistance value to achieve isolation of the CC2 signal, and power is supplied by a transformer isolation power supply.
The isolation requirements for mining BMS are realized, the safety and stability of the circuit are ensured, development costs are saved, and a BMS system is not necessary.
Smart Images
Figure CN222301802U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of a mining power supply BMS system, in particular to a mining BMS isolation circuit. Background Art
[0002] The integrated mining power supply battery management system is referred to as the integrated mining power supply BMS system. This system is a control system that protects the safe use of batteries. It monitors the use status of batteries at all times, alleviates the inconsistency of battery packs through necessary measures, and provides protection for the safe use of explosion-proof and intrinsically safe lithium-ion battery power supplies for mining. It has data acquisition, output charging overcurrent protection, discharge overcurrent protection, short circuit protection, charge and discharge overvoltage protection, and battery overtemperature protection.
[0003] The CC2 circuit of an existing mining BMS is usually connected to the power ground or the shell of the battery pack. During use, the reference ground connected to the CC2 circuit must be isolated from the power ground or the shell, and the CC2 circuit is not isolated. Utility Model Content
[0004] Based on this, it is necessary to provide a mining BMS isolation circuit to address the problem that there is no isolation solution for the CC2 circuit.
[0005] A BMS isolation circuit for mining includes a comparator and an optocoupler, wherein the input end of the comparator receives a first signal formed from a charging end, and the output end of the comparator is connected to the optocoupler, and the optocoupler forms a second signal; the comparator is provided with a threshold resistor, and the first signal is compared with the resistance value of the threshold resistor to control the conduction or disconnection of the optocoupler.
[0006] In one embodiment, when the comparator outputs a high level, the optocoupler is closed; when the comparator outputs a low level, the optocoupler is disconnected.
[0007] In one embodiment, the threshold resistance is 3.3K.
[0008] In one of the embodiments, a transformer isolation power supply is further included, and the BMS end supplies power to the isolation circuit through the transformer isolation power supply.
[0009] In one embodiment, a second resistor is further included, and the second resistor is connected to the optical coupler.
[0010] In one embodiment, the second resistor is 1K.
[0011] The utility model realizes the isolation requirement of the mining BMS by adding an isolation circuit. More specifically, an isolation circuit that can compare the resistance values is designed. When the first signal is transmitted to the comparator, a threshold resistor is provided in the comparator. By comparing the threshold resistor with the resistance value of the first signal, the conduction or disconnection of the optocoupler is controlled, thereby realizing the isolation requirement of the mining BMS. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a circuit diagram of the utility model.
[0013] Figure 2 It is the work flow chart of the utility model. DETAILED DESCRIPTION
[0014] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.
[0015] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.
[0016] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.
[0017] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.
[0018] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.
[0019] In this embodiment, a mining BMS isolation circuit is designed. The isolation circuit is mainly used in the CC2 circuit in the mining field, where CC2 is a signal for the vehicle to determine whether the charging plug and the socket are connected. The isolation requirement of the mining BMS is achieved by adding an isolation circuit. More specifically, a CC2 isolation circuit for comparing resistance values is designed.
[0020] See also Figure 1 and Figure 2 , including a comparator 10 and an optocoupler 20, wherein the input end of the comparator 10 receives a first signal formed from a charging end, and the output end thereof is connected to the optocoupler 20, and the optocoupler 20 forms a second signal; the comparator is provided with a threshold resistor 30, and the first signal is compared with the resistance value of the threshold resistor 30 to control the conduction or disconnection of the optocoupler.
[0021] It can be understood that the first signal is formed and transmitted from the charging end to the comparator 10, wherein the charging end can be in the form of a charging pile or other rechargeable device. Preferably, the first signal is a CC2 input signal. The comparator 10 receives the first signal, and the first signal includes resistance information, which can be compared with the threshold resistor 30 in the comparator, and then fed back to the optical coupler according to the comparison result, and finally the second signal is formed by the optical coupler 20. Specifically, the threshold resistor 30 can be set to different resistance values, for example, 2K, 3.3K, 5K, 10K and other resistance values, which can be set according to actual needs.
[0022] In this embodiment, when the comparator 10 outputs a high level, the optocoupler 20 is closed; when the comparator outputs a low level, the optocoupler is disconnected. After the first signal is compared with the threshold resistor 30, for example, the resistance of the threshold resistor 30 is 3.3K, when the resistance of the first signal is greater than the threshold resistor 30, the comparator 10 outputs a high level to close the optocoupler 20, and the second signal generated by the closed optocoupler 20 will be transmitted to the BMS end; when the resistance of the first signal is greater than the threshold resistor 30, the comparator 10 outputs a low level to disconnect the optocoupler 20, and the second signal will be suspended and thus not transmitted to the BMS end. Using the above method, a relatively simple circuit can be used to achieve isolation of the CC2 signal, meet the needs of mining BMS, save development costs, and do not need to redevelop a set of BMS.
[0023] In this embodiment, a second resistor is also included, and the second resistor is connected to the optical coupler. The second resistor is 1K. The function of the second resistor is to ensure that when the optical coupler is closed, the BMS end can normally receive the second signal.
[0024] See also Figure 2 In this embodiment, the following steps are mainly included: (1) a first signal is input, and the first signal is input to the comparator 10; (2) whether the resistance of the first signal is less than the threshold resistance; (3) when the resistance of the first signal is less than the threshold resistance, the optocoupler is turned on, and the second signal is connected to the second resistor at the BMS end; when the resistance of the first signal is greater than the threshold resistance, the optocoupler is disconnected, and the second signal is left floating.
[0025] In addition, the isolation circuit works normally. When charging, when the resistance of the first signal is less than the threshold resistance 30, the comparator 10 outputs a high level to close and turn on the optocoupler 20, which is connected to the second signal output to the BMS through a second resistor and finally transmitted to the BMS end; when not charging, the first signal will be suspended, and when compared with the threshold resistance 30, the comparator 10 will also output a low level to disconnect the optocoupler 20, and the second signal output to the BMS end will be suspended.
[0026] In this embodiment, a transformer isolation power supply is also included, and the BMS end supplies power to the isolation circuit through the transformer isolation power supply to ensure the use of the isolation circuit.
[0027] This patent realizes the isolation requirement of mining BMS by adding an isolation circuit. More specifically, an isolation circuit that can compare resistance values is designed. When the first signal is transmitted to the comparator, a threshold resistor is set in the comparator. By comparing the threshold resistor with the resistance value of the first signal, the conduction or disconnection of the optocoupler is controlled, thereby realizing the isolation requirement of mining BMS.
[0028] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. A BMS isolation circuit for mining, characterized in that: The invention comprises a comparator (10) and an optical coupler (20), wherein the input end of the comparator receives a first signal formed from a charging end, and the output end of the comparator is connected to the optical coupler, and the optical coupler forms a second signal; the comparator is provided with a threshold resistor (30), and the first signal is compared with the resistance value of the threshold resistor to control the conduction or disconnection of the optical coupler.
2. According to claim 1, the BMS isolation circuit for mining is characterized in that: When the comparator outputs a high level, the optocoupler is closed; when the comparator outputs a low level, the optocoupler is disconnected.
3. According to claim 1, the BMS isolation circuit for mining is characterized in that: The threshold resistance is 3.3K.
4. The mining BMS isolation circuit according to claim 1 is characterized in that: It also includes a transformer isolation power supply, and the BMS end supplies power to the isolation circuit through the transformer isolation power supply.
5. The mining BMS isolation circuit according to claim 1 is characterized in that: A second resistor is also included, and the second resistor is connected to the optical coupler.
6. The mining BMS isolation circuit according to claim 5 is characterized in that: The second resistor is 1K.