Backup power supply of mining direct-current screen

Abstract

The utility model discloses a mining direct current screen back-up power supply in the related technical field of mining power supplies, which comprises a lower shell and an upper cover main body matched with the lower shell, an outer side edge of the upper cover main body is provided with an upper cover fixing hole, an end position of the lower shell is provided with a switch button, a side edge of the switch button is provided with a charging connector, and the charging connector is connected with the lower shell. A charging connector is arranged in the lower shell, a discharging connector is arranged below the charging connector, fixing holes are formed in the two ends of the bottom face of the lower shell, shell fixing screws are arranged in the fixing holes, and a power protection plate and a battery pack are arranged in the lower shell. The power supply protection plate is arranged in the mining power supply box, the power supply protection plate converts the output of the power supply into the energy input of the mining battery power supply, the power supply protection plate is connected with the lithium iron phosphate battery pack, the charging and discharging management can be carried out on the battery pack, and the controller outputs a signal to control the battery pack to release energy.

Description

Technical Field

[0001] The utility model belongs to the technical field related to mine power supplies, and in particular relates to a backup power supply for a mine DC panel. Background Art

[0002] 12V15Ah lithium battery packs are primarily used for outdoor 12V voltage regulation. Mining flameproof lithium-ion battery power supplies are specialized power supplies primarily used in hazardous environments with explosion risks, such as coal mines, to provide safe, reliable, long-term, and stable power for underground lighting, communications, and safety monitoring equipment. These batteries offer higher energy density and can provide longer power. They also have a longer lifespan, eliminating the hassle and expense of frequent battery replacements, resulting in lower operating costs and greater reliability and safety. Lithium iron phosphate is a widely available and inexpensive raw material. However, existing mining flameproof lithium-ion batteries are significantly affected by environmental factors during use, resulting in unstable output voltage. This inability to effectively control the charging and discharging processes can lead to overcharging and overdischarging, significantly impacting the lifespan and safety of the power supply. Furthermore, improper insertion and removal of the battery connector, such as at an angle, can short-circuit the connector cable and the power cord.

[0003] In view of this, the present utility model is proposed. Utility Model Content

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a backup power supply for a DC panel used in mines. To solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0005] The backup power supply of the DC panel for mining includes a lower shell and an upper cover body equipped therewith. An upper cover fixing hole is provided at the outer edge of the upper cover body, a switch button is provided at the end position of the lower shell, a charging connector is provided on the side of the switch button, and a discharge connector is provided below the charging connector. Fixing holes are provided at both end positions of the bottom surface of the lower shell, and shell fixing screws are provided in the fixing holes. A power protection board and a battery pack are provided in the lower shell.

[0006] As a further solution of the present invention: the power protection board includes a DC / DC control and main power conversion circuit module, a battery voltage and current sampling circuit module, a battery pack charge and discharge switch control circuit module, a main chip and a communication interface, and a temperature acquisition module. The power protection board converts the output of the power supply into energy input for the battery pack.

[0007] As a further solution of the present invention: the power protection board is electrically connected to the battery pack, and the battery pack charge and discharge switch control circuit module on the power protection board manages the charge and discharge of the battery pack.

[0008] As a further solution of the present invention: a handle is welded on the end of the lower shell away from the switch button, an explosion-proof switch protection cover is provided on the outside of the switch button, and the upper cover body and the lower shell are both made of 5mm thick carbon steel.

[0009] After adopting the above technical solution, the utility model has the following beneficial effects compared with the prior art.

[0010] The utility model provides a power protection board in the mining power box, which converts the output of the power supply into energy input of the mining battery power supply. The power protection board is connected to the lithium iron phosphate battery pack and can manage the charge and discharge of the battery pack. The controller outputs a signal to control the battery pack to release energy.

[0011] The power protection board of the utility model can display various states of the mining battery power supply during use, and can also be connected to the single-chip microcomputer through the data pins SMBC and SMBD of the battery charge and discharge management chip to send the battery information to the host computer through the serial port for data processing or display. The utility model has the characteristics of reliable performance and strong anti-interference ability.

[0012] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are part of this application and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0014] In the picture:

[0015] Figure 1 This is a schematic diagram of the appearance structure of the utility model;

[0016] Figure 2 This is the main view of the utility model;

[0017] Figure 3 It is a side view of the utility model;

[0018] Figure 4 This is a schematic end view of the utility model;

[0019] Figure 5 This is the DC / DC control and main power conversion circuit diagram of the utility model;

[0020] Figure 6 This is the battery voltage and current sampling circuit diagram of the utility model;

[0021] Figure 7 This is the battery charge and discharge switch control circuit diagram of the utility model;

[0022] Figure 8 This is the main chip, communication interface and temperature acquisition circuit diagram of the utility model.

[0023] In the figure: 1. Lower shell; 2. Upper cover body; 3. Upper cover fixing hole; 4. Switch button; 5. Shell fixing screw; 6. Fixing hole; 7. Discharge connector; 8. Charging connector; 9. Handle.

[0024] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0026] like Figures 1 to 8 As shown, the backup power supply of the mining DC panel includes a lower shell 1 and an upper cover body 2 equipped therewith. An upper cover fixing hole 3 is provided at the outer edge of the upper cover body 2, a switch button 4 is provided at the end position of the lower shell 1, a charging connector 8 is provided on the side of the switch button 4, and a discharge connector 7 is provided below the charging connector 8. Fixing holes 6 are provided at both end positions of the bottom surface of the lower shell 1, and shell fixing screws 5 are provided in the fixing holes 6. A power protection board and a battery pack are provided in the lower shell 1.

[0027] Among them, the power protection board includes DC / DC control and main power conversion circuit module, battery voltage and current sampling circuit module, battery pack charge and discharge switch control circuit module, main chip and communication interface and temperature acquisition module. The power protection board converts the output of the power supply into energy input of the battery pack.

[0028] The power protection board is electrically connected to the battery pack, and the battery pack charge and discharge switch control circuit module on the power protection board manages the charge and discharge of the battery pack.

[0029] A handle 9 is welded on the end of the lower shell 1 away from the switch button 4, and an explosion-proof switch protection cover is provided on the outside of the switch button 4. The upper cover body 2 and the lower shell 1 are both made of 5mm thick carbon steel.

[0030] The working principle of this utility model is:

[0031] like Figure 5 As shown, DC / DC control and main power conversion circuit module:

[0032] The DC / DC power conversion part uses UC2843 as the main control chip of the flyback power supply, which steps down the input voltage and outputs it. The input voltage is input through J2, and the transistor JN1 is used as a linear voltage regulator to supply the VCC power supply of UC2843, so that UC2843 can start normally. When the power supply starts and works normally, the VCC power supply is changed to the feedback winding of the transformer JT1.

[0033] The primary-side inductor JH1 of the power supply is used as the primary input current collection inductor to detect the current flowing through the primary coil of the transformer. When the power supply output is short-circuited or the power increases, the collection end will detect the change in primary current and stop the power supply to protect it from damage due to overload or short circuit.

[0034] The secondary output end of the power transformer JT1 rectifies the high-frequency AC voltage generated by the transformer through the rectifier diode JD9 and outputs a DC pulsating voltage. After being filtered by the inductor L1 and the capacitor JC23, the pulsating DC power is converted into smooth DC power to charge the battery.

[0035] The output control part of the DC / DC power supply is divided into output constant current control and output voltage limiting control. The constant current control uses the current sampling resistor JR36 to collect the flowing current. The collected current value is converted into a voltage and sent to JU4A of the operational amplifier LM358 for comparison with the set reference voltage value. When the output current of the power supply increases, a high level is generated to activate the optocoupler JG1, thereby controlling UC2834 to reduce the current output of the power supply to ensure that the current is not too large when charging the battery. At the same time, the output voltage of the power supply is sent to JU4B of the operational amplifier LM358 for comparison with the set reference voltage of 2.5V. When the output voltage exceeds the set value, the operational amplifier outputs a high level to control UC2834 to reduce the voltage output of the power supply, so that the output voltage of the power supply remains constant.

[0036] like Figure 6 As shown, the battery voltage and current sampling circuit module:

[0037] The battery connection line is connected to terminal J9. The battery voltage is sampled by resistors R20, R21, R22, and R23 and then sent to the battery charge and discharge management chip. The battery management chip reads the battery voltage value and displays the voltage value intuitively through LED indicators LED1, LEDB, and LEDC. The battery charge and discharge current is sampled and converted into a voltage value through sampling resistor R19 and sent to the battery charge and discharge management chip.

[0038] The battery generates heat during the charging and discharging process. In order to ensure the safety of the battery, the battery temperature must be monitored at all times. Temperature monitoring converts temperature changes into resistance changes through the thermistor RT1. When the resistance changes, the voltage across the resistor will also change. Therefore, the temperature monitoring pin of the battery charge and discharge management chip is connected to the thermistor to monitor the voltage across the thermistor to determine the battery temperature change.

[0039] In addition to using LED indicators to display the battery voltage, current, and temperature information, the battery can also be connected to the microcontroller through the data pins SMBC and SMBD of the battery charge and discharge management chip to send the battery information to the host computer through the serial port for data processing or display;

[0040] like Figure 7 As shown, the battery charge and discharge switch control circuit module:

[0041] The battery charge and discharge control circuit is used to control the battery during charging. When the battery is fully charged, the connection between the charger and the battery is cut off. When the battery is discharging, when the battery is almost discharged, the connection between the battery and the load is cut off. The battery charge and discharge switch control circuit is used to protect the battery from overcharging and overdischarging, ensuring the safety of battery use.

[0042] The battery charge and discharge switch control circuit is composed of two MOS tubes Q2 and Q3. MOS tube Q2 is used to control the battery charging circuit, and MOS tube Q3 is used to control the battery discharging circuit.

[0043] When the battery power is low, after the charger is connected, the control pin CHG of the MOS tube Q2 receives a control signal to connect the connection path between the charger and the battery to charge the battery. During the charging process, when the battery management chip detects that the battery power is full, it will turn off the control pin of the MOS tube Q2, thereby cutting off the connection between the charger and the battery to prevent the battery from being overcharged.

[0044] When the battery is discharging, the battery management chip detects that the battery power is low and sends a control signal DSG to the battery discharge control MOS tube Q3 to cut off the connection between the battery and the load to stop the battery from discharging externally, thereby protecting the battery from damage due to over-discharge.

[0045] like Figure 8As shown, the main chip, communication interface and temperature acquisition circuit:

[0046] The fuel gauge (main chip BQ40Z50-R1) collects information such as battery voltage, battery temperature, and battery current, calculates battery charge and health information through Coulomb integration and battery modeling, and communicates with the external host through the I2C communication port;

[0047] The BAT pin is connected to the PACK+ pin at the top of the battery through a diode D1. The function of the diode is to prevent the voltage of the fuel gauge BAT pin from being pulled down even if the battery voltage B+ is momentarily pulled down by a pulse in the event of a short circuit or overcurrent. The VCC pin is connected between the charging MOS (Q1) and the discharging MOS (Q3) through the R9 (100 ohm) resistor. The PBI pin is connected to the C13 (2.2Uf) capacitor for filtering and decoupling. The PACK pin is connected to the battery port PACK+ through a 10K resistor to detect the insertion of a charger.

[0048] The temperature sampling circuit (main chip BQ40Z50-R1) uses an internal 18K pull-up resistor on the NTC pin TSx, and the other end of the external NTC is grounded with a 10K resistor;

[0049] The communication circuit uses the I2C communication protocol (I2C is a two-wire communication protocol (clock line SCL, data line SDA)). Since the battery interface interacts with the outside world, it is susceptible to ESD. Moreover, if the interface is not plugged in properly, such as when plugged in at an angle, there is a risk of short circuiting the interface line and the power line. Therefore, the communication line uses a T-type circuit to limit current and enhance ESD protection. A 200-ohm resistor R24 ​​is placed close to the SMBD pin of the fuel gauge to limit current and protect the SMBD pin. A TVS tube or voltage regulator diode D2 is connected to ground in the middle. A 100-ohm resistor R25 is connected to the battery port to limit current and protect D2.

[0050] The LED display circuit has a built-in constant current source that can drive the LED display, which can be used to indicate information such as the state of charge (SOC) and battery fault. It supports 5 LEDs, and the 3 LEDCNTL PINs control the circuit of 5 LEDs. When the DISP pin is used to trigger the LED display, if only 4 LEDs are used, remove LED5 in the figure. In the fuel gauge parameters, configure the SOC LED display threshold according to the 4-segment setting.

[0051] A power protection board 10 is provided in the mining power supply box of the present invention. The power protection board 10 converts the output of the power supply into energy input of the mining battery power supply. The power protection board 10 is connected to the lithium iron phosphate battery pack 11 and can manage the charge and discharge of the battery pack 11. The controller outputs a signal to control the battery pack 11 to release energy. The power protection board 10 can display various states of the mining battery power supply during use, and can also be connected to the single-chip microcomputer through the data pins SMBC and SMBD of the battery charge and discharge management chip to send the battery information through the serial port to the host computer for data processing or display. The utility model has the characteristics of reliable performance and strong anti-interference ability.

[0052] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make slight changes or modifications to equivalent embodiments using the above-mentioned technical content without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A DC panel backup power supply for mining, comprising a lower housing (1) and an upper cover body (2) provided therewith, characterized in that: An upper cover fixing hole (3) is provided at the outer edge of the upper cover body (2); a switch button (4) is provided at the end of the lower shell (1); a charging connector (8) is provided on the side of the switch button (4); a discharge connector (7) is provided below the charging connector (8); fixing holes (6) are provided at both end positions of the bottom surface of the lower shell (1); shell fixing screws (5) are provided in the fixing holes (6); and a power protection board and a battery pack are provided in the lower shell (1).

2. The DC panel backup power supply for mining according to claim 1 is characterized in that: The power protection board (10) comprises a DC / DC control and main power conversion circuit module, a battery voltage and current sampling circuit module, a battery pack charge and discharge switch control circuit module, a main chip, a communication interface and a temperature acquisition module.

3. The DC panel backup power supply for mining according to claim 2 is characterized in that: The power protection board is electrically connected to the battery pack.

4. The DC panel backup power supply for mining according to claim 3 is characterized in that: A handle (9) is welded to one end of the lower shell (1) away from the switch button (4), and an explosion-proof switch protection cover is provided on the outside of the switch button (4).

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