Constant current source charging circuit applied to mining audible and visual alarm
By designing a constant current source charging circuit for mining acousto-optical alarms, the problems of complex design and large power consumption of lithium battery charging circuits in the prior art are solved, and the intrinsic safety power supply can supply power to multiple devices at the same time, reducing the power burden and cost.
Patent Information
- Application Number
- CN202421928805.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-08-09
AI Technical Summary
In existing mining coal miners, the charging current of the lithium battery charging circuit should not be too large due to the intrinsic safety power capacity limit, resulting in the complex design of the ordinary constant current source driving circuit and large power consumption, so it is impossible to supply power to multiple devices at the same time, which increases the burden and cost of the intrinsic safety power supply.
A constant current source charging circuit applied to a mining acousto-optical alarm is designed, including a first protection unit, a charging control unit, a constant current conversion unit and a second protection unit. Through the combination of these units, a constant current output is realized, reducing the burden of the intrinsically safe power supply.
Charging through constant current source reduces the burden of intrinsic safety power supply, solves the problems of complexity and high power consumption of traditional circuits, and allows intrinsic safety power supply to carry more equipment.
Smart Images
Figure CN222996264U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mining shearers, in particular to a constant current source charging circuit applied to a mine acoustic-optic alarm device. Background Art
[0002] For coal mines, the lithium battery charging circuit is limited by the capacity of the intrinsically safe power supply, and the charging current should not be set too large. However, a common constant current source drive circuit requires a relatively complex circuit design and debugging to achieve precise current control and stability requirements. Since a stable current output needs to be maintained, the common constant current source drive circuit consumes a certain amount of electrical energy, resulting in a relatively large power consumption of the entire system.
[0003] When the internal lithium battery of a mine acoustic-optic alarm device is charged using an intrinsically safe power supply, when one intrinsically safe power supply supplies power to multiple devices, due to the excessive current required for lithium battery charging, it can only supply power to one device and cannot supply power to multiple devices simultaneously, resulting in the phenomenon that the intrinsically safe power supply cannot drive the devices, thus increasing the burden and cost of the intrinsically safe power supply. Summary of the Invention
[0004] In view of the above deficiencies in the prior art, the utility model provides a constant current source charging circuit applied to a mine acoustic-optic alarm device.
[0005] To achieve the above-mentioned utility model purpose, the technical solution adopted by the utility model is as follows:
[0006] A constant current source charging circuit applied to a mine acoustic-optic alarm device includes a first protection unit, a charging control unit, a constant current conversion unit, and a second protection unit; the input end of the first protection unit is connected to the charging input end, and the output end of the first protection unit is connected to the first input end of the charging control unit; the second input end of the charging control unit is connected to the control signal input end, and the output end of the charging control unit is connected to the input end of the constant current conversion unit; the output end of the constant current conversion unit is connected to the input end of the second protection unit; the output end of the second protection unit is connected to the charging output end.
[0007] Preferably, the first protection unit includes a first diode and a first fuse; the positive electrode of the first diode is connected to the charging input end, the negative electrode of the first diode is connected to one end of the first fuse; the other end of the first fuse is connected to the first input end of the charging control unit.
[0008] Preferably, the charging control unit includes a first transistor, a first triode, a second triode, and a third triode; the drain of the first transistor is respectively connected to the other end of the first fuse, one end of the first resistor, and one end of the second resistor, the source of the first transistor is connected to the input end of the constant current conversion unit, and the gate of the first transistor is respectively connected to one end of the third resistor and the other end of the second resistor; the collector of the first triode is connected to the other end of the third resistor, the base of the first triode is connected to the other end of the first resistor and the collector of the second triode, and the emitter of the first triode is grounded; the emitter of the second triode is grounded, and the base of the second triode is connected to the emitter of the third triode; the collector of the third triode is connected to the 3.3V voltage terminal, and the base of the third triode is connected to the control signal input terminal.
[0009] Preferably, the constant current conversion unit includes a first constant current source chip, a second constant current source chip, and a third constant current source chip connected in parallel; pin 4 of the first constant current source chip is connected to the source of the first transistor, pins 3 and 2 of the first constant current source chip are connected to the input end of the second protection unit, pin 1 of the first constant current source chip is sequentially connected to the input end of the second protection unit through the fourth resistor and the first switch, and pins 7 and 6 of the first constant current source chip are connected to the input end of the second protection unit; pin 4 of the second constant current source chip is connected to the source of the first transistor, pins 3 and 2 of the second constant current source chip are connected to the input end of the second protection unit, pin 1 of the second constant current source chip is sequentially connected to the input end of the second protection unit through the fifth resistor and the sixth resistor, and the connection end of the fifth resistor and the sixth resistor is connected to the input end of the second protection unit through the second switch, and pins 7 and 6 of the second constant current source chip are connected to the input end of the second protection unit; pin 4 of the third constant current source chip is respectively connected to the source of the first transistor and one end of the first capacitor, the other end of the first capacitor is grounded, pins 3 and 2 of the third constant current source chip are connected to the input end of the second protection unit, pin 1 of the third constant current source chip is connected to the input end of the second protection unit through the seventh resistor, and pins 7 and 6 of the third constant current source chip are connected to the input end of the second protection unit.
[0010] Preferably, the first constant current source chip, the second constant current source chip, and the third constant current source chip all adopt LM234DT chips.
[0011] Preferably, the second protection unit includes a second diode and a second fuse; the positive pole of the second diode serves as the input end of the second protection unit, and the negative pole of the second diode is connected to one end of the second fuse; the other end of the second fuse is connected to the charging output terminal.
[0012] Preferably, the charging input end includes a first connector.
[0013] Preferably, the charging output end includes a second connector.
[0014] The utility model has the following beneficial effects:
[0015] The utility model uses a constant current source for charging, reducing the burden on the intrinsically safe power supply, thus solving the problems of the complexity and high power consumption of traditional circuits, enabling the intrinsically safe power supply to carry more devices. Description of the Drawings
[0016] Figure 1 It is a schematic structural diagram of a constant current source charging circuit applied to a mine-used acoustic and optical alarm;
[0017] Figure 2 It is a schematic diagram of the principle of a constant current source charging circuit applied to a mine-used acoustic and optical alarm. Specific Embodiments
[0018] The following describes the specific embodiments of the utility model to facilitate those skilled in the art of this technology to understand the utility model. However, it should be clear that the utility model is not limited to the scope of the specific embodiments. For those of ordinary skill in the art of this technology, as long as various changes are within the spirit and scope of the utility model defined and determined by the appended claims, these changes are obvious, and all utility models created using the concept of the utility model are within the scope of protection.
[0019] As Figure 1 As shown, the embodiment of the utility model provides a constant current source charging circuit applied to a mine-used acoustic and optical alarm, including a first protection unit, a charging control unit, a constant current conversion unit, and a second protection unit; the input end of the first protection unit is connected to the charging input end, and the output end of the first protection unit is connected to the first input end of the charging control unit; the second input end of the charging control unit is connected to the control signal input end, and the output end of the charging control unit is connected to the input end of the constant current conversion unit; the output end of the constant current conversion unit is connected to the input end of the second protection unit; the output end of the second protection unit is connected to the charging output end.
[0020] In this embodiment, aiming at the problem that the conventional constant current source circuit is formed by using triodes, and the constant current source drive circuit requires relatively complex circuit design and debugging to achieve precise current control and stability requirements. At the same time, due to the need to maintain a stable current output, the constant current source drive circuit needs to consume a certain amount of electric energy, resulting in a relatively large power consumption of the entire system. The utility model uses a constant current source for charging, reducing the burden on the intrinsically safe power supply, thus solving the problems of the complexity and high power consumption of traditional circuits, enabling the intrinsically safe power supply to carry more devices.
[0021] In an alternative embodiment of the present utility model, the first protection unit includes a first diode D1 and a first fuse F1; the positive electrode of the first diode D1 is connected to the charging input terminal, the negative electrode of the first diode D1 is connected to one end of the first fuse F1; the other end of the first fuse F1 is connected to the first input terminal of the charging control unit.
[0022] In an alternative embodiment of the present utility model, the charging control unit includes a first transistor Q4, a first triode Q1, a second triode Q2, and a third triode Q3; the drain of the first transistor Q4 is respectively connected to the other end of the first fuse F1, one end of the first resistor R1, and one end of the second resistor R2, the source of the first transistor Q4 is connected to the input terminal of the constant current conversion unit, the gate of the first transistor Q4 is respectively connected to one end of the third resistor R3 and the other end of the second resistor R2; the collector of the first triode Q1 is connected to the other end of the third resistor R3, the base of the first triode Q1 is connected to the other end of the first resistor R1 and the collector of the second triode Q2, the emitter of the first triode Q1 is grounded; the emitter of the second triode Q2 is grounded, the base of the second triode Q2 is connected to the emitter of the third triode Q3; the collector of the third triode Q3 is connected to the 3.3V voltage terminal, the base of the third triode Q3 is connected to the control signal input terminal.
[0023] In an alternative embodiment of the present utility model, the constant current conversion unit includes a first constant current source chip U1, a second constant current source chip U2, and a third constant current source chip U3 connected in parallel; pin 4 of the first constant current source chip U1 is connected to the source of the first transistor Q4, pins 3 and 2 of the first constant current source chip U1 are connected to the input end of the second protection unit, pin 1 of the first constant current source chip U1 is sequentially connected to the input end of the second protection unit through a fourth resistor R4 and a first switch K1, and pins 7 and 6 of the first constant current source chip U1 are connected to the input end of the second protection unit; pin 4 of the second constant current source chip U2 is connected to the source of the first transistor Q4, pins 3 and 2 of the second constant current source chip U2 are connected to the input end of the second protection unit, pin 1 of the second constant current source chip U2 is sequentially connected to the input end of the second protection unit through a fifth resistor R5 and a sixth resistor R6, and the connection end of the fifth resistor R5 and the sixth resistor R6 is connected to the input end of the second protection unit through a second switch K2, and pins 7 and 6 of the second constant current source chip U2 are connected to the input end of the second protection unit; pin 4 of the third constant current source chip U3 is respectively connected to the source of the first transistor Q4 and one end of a first capacitor C1, the other end of the first capacitor C1 is grounded, pins 3 and 2 of the third constant current source chip U3 are connected to the input end of the second protection unit, pin 1 of the third constant current source chip passes through a seventh resistor R7 and is connected to the input end of the second protection unit, and pins 7 and 6 of the third constant current source chip are connected to the input end of the second protection unit.
[0024] In an alternative embodiment of the present utility model, the first constant current source chip U1, the second constant current source chip U2, and the third constant current source chip U3 all adopt LM234DT chips.
[0025] In an alternative embodiment of the present utility model, the second protection unit includes a second diode D2 and a second fuse F2; the positive electrode of the second diode D2 serves as the input end of the second protection unit, and the negative electrode of the second diode D2 is connected to one end of the second fuse F2; the other end of the second fuse F2 is connected to the charging output end.
[0026] In an alternative embodiment of the present utility model, the charging input end includes a first connector.
[0027] In an alternative embodiment of the present utility model, the charging output end includes a second connector.
[0028] In this embodiment, the intrinsically safe power supply is connected through a connector. After passing through the reverse connection prevention SS36 diode D1, it passes through the fuse F1 with the model FSMD020 and the CJ3401 - PMOS transistor Q4. The PMOS transistor is controlled to turn off and on by two NPN transistors Q1, Q2 and one PNP transistor Q3. The control principle is as follows: Through the level of the MUC pin, a low level is output, causing Q3 to conduct. After Q3 conducts, the base of Q2 obtains a high level of 3.3V. At this time, Q2 conducts, the base of Q1 obtains a high level, Q1 conducts, the gate of the PMOS transistor Q4 obtains a low level, and Q4 conducts, thereby turning on the MOS transistor to charge the battery. The current - limiting resistors R1, R2, and R3 are 100K ohms. If it is detected that the battery is fully charged, the PMOS can be turned off by controlling the transistor through an external MCU. To reduce the voltage fluctuations caused by the turning on and off of the MOS transistor, a constant - current source chip is connected in parallel to expand the output current, and a capacitor C133nF / 50V is added for filtering. Then, the input voltage is converted into a constant - current source current output. The output current can be adjusted by setting the resistors R4, R5, R6, and R7. To ensure the accuracy and reliability of the system input, high - precision resistors R4, R5, R6, and R7 with a resistance value of 6.8 ohms are used, and the resistor accuracy is one - thousandth. Through the switches K1 and K2, the output current can be adjusted to three gears of 9mA, 18mA, and 27mA for selection, meeting the usage in various situations. To ensure the absolute safety of lithium - battery charging, the input voltage is controlled below 24V DC, and it is preferably powered by a 12V intrinsically safe power supply. Among them, D2 is a reverse connection prevention diode connected to the battery terminal to prevent the positive and negative of the battery from being reversed and damaging the chip, and F2 is an over - current fuse to prevent the damage of the previous - stage chip due to over - current and damage to the battery.
[0029] In this embodiment, the output current can be controlled through a DIP switch according to the load - carrying situation of the intrinsically safe power supply, thereby ensuring the effectiveness of the intrinsically safe power supply in carrying load and the ability to carry multiple devices simultaneously, which has good practicality.
[0030] In the present utility model, specific embodiments are applied to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, based on the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.
[0031] Those of ordinary skill in the art will realize that the embodiments described herein are provided to assist the reader in understanding the principles of the present utility model, and it should be understood that the scope of protection of the present utility model is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific deformations and combinations that do not depart from the essence of the present utility model based on these technical revelations disclosed by the present utility model, and these deformations and combinations are still within the scope of protection of the present utility model.
Claims
1. A constant current source charging circuit for a mine sound and light alarm, characterized in that: It includes a first protection unit, a charging control unit, a constant current conversion unit and a second protection unit; the input end of the first protection unit is connected to the charging input end, and the output end of the first protection unit is connected to the first input end of the charging control unit; the second input end of the charging control unit is connected to the control signal input end, and the output end of the charging control unit is connected to the input end of the constant current conversion unit; the output end of the constant current conversion unit is connected to the input end of the second protection unit; and the output end of the second protection unit is connected to the charging output end.
2. A constant current source charging circuit for a mine sound and light alarm according to claim 1, characterized in that: The first protection unit includes a first diode and a first fuse; the anode of the first diode is connected to the charging input terminal, the cathode of the first diode is connected to one end of the first fuse; the other end of the first fuse is connected to the first input terminal of the charging control unit.
3. A constant current source charging circuit for a mine sound and light alarm according to claim 2, characterized in that: The charging control unit includes a first transistor, a first triode, a second triode and a third triode; the drain of the first transistor is respectively connected to the other end of the first fuse, one end of the first resistor and one end of the second resistor, the source of the first transistor is connected to the input end of the constant current conversion unit, and the gate of the first transistor is respectively connected to one end of the third resistor and the other end of the second resistor; the collector of the first triode is connected to the other end of the third resistor, the base of the first triode is connected to the other end of the first resistor and the collector of the second triode, and the emitter of the first triode is grounded; the emitter of the second triode is grounded, and the base of the second triode is connected to the emitter of the third triode; the collector of the third triode is connected to the 3.3V voltage end, and the base of the third triode is connected to the control signal input end.
4. A constant current source charging circuit for a mine sound and light alarm according to claim 3, characterized in that: The constant current conversion unit includes a first constant current source chip, a second constant current source chip and a third constant current source chip connected in parallel; pin 4 of the first constant current source chip is connected to the source of the first transistor, pin 3 and pin 2 of the first constant current source chip are connected to the input end of the second protection unit, pin 1 of the first constant current source chip is connected to the input end of the second protection unit through a fourth resistor and a first switch in sequence, and pin 7 and pin 6 of the first constant current source chip are connected to the input end of the second protection unit; pin 4 of the second constant current source chip is connected to the source of the first transistor, pin 3 and pin 2 of the second constant current source chip are connected to the input end of the second protection unit, and pin 1 of the second constant current source chip is connected to the input end of the second protection unit in accordance with the fourth resistor and the first switch. The fifth resistor and the sixth resistor are connected to the input end of the second protection unit, and the connection end of the fifth resistor and the sixth resistor is connected to the input end of the second protection unit through the second switch, and the pin 7 and pin 6 of the second constant current source chip are connected to the input end of the second protection unit; the pin 4 of the third constant current source chip is respectively connected to the source of the first transistor and one end of the first capacitor, and the other end of the first capacitor is grounded, the pin 3 and pin 2 of the third constant current source chip are connected to the input end of the second protection unit, the pin 1 of the third constant current source chip is connected to the input end of the second protection unit through the seventh resistor, and the pin 7 and pin 6 of the third constant current source chip are connected to the input end of the second protection unit.
5. A constant current source charging circuit for a mine sound and light alarm according to claim 4, characterized in that: The first constant current source chip, the second constant current source chip and the third constant current source chip all adopt LM234DT chips.
6. A constant current source charging circuit for a mine sound and light alarm according to claim 5, characterized in that: The second protection unit includes a second diode and a second fuse; the anode of the second diode serves as the input end of the second protection unit, the cathode of the second diode is connected to one end of the second fuse; the other end of the second fuse is connected to the charging output end.
7. A constant current source charging circuit for a mine sound and light alarm according to claim 6, characterized in that: The charging input terminal includes a first connector.
8. A constant current source charging circuit for a mine sound and light alarm according to claim 7, characterized in that: The charging output terminal includes a second connector.