Ia-rated protection devices and systems for mine lamps

Abstract

This invention proposes an ia-level protection device and system for mine lamps. The device includes a protection circuit connected in series and a parallel circuit. The parallel circuit includes multiple parallel branches, one of which is connected to the negative terminal of an external mine lamp panel. The other parallel branches are connected in series with a current-limiting resistor, a detection circuit, and then to the negative terminal of an external load. The positive terminal of an external battery is connected to both the positive terminal of the mine lamp panel and the positive terminal of the load. The negative terminal of the battery is connected to one end of the protection circuit, and the other end of the protection circuit is connected to the parallel circuit. If the detection circuit detects that the battery is charging the mine lamp panel, it disconnects the parallel branch, making the current between the load and the negative terminal of the battery zero. This invention solves the technical problems in the prior art of mine lamp flickering caused by adding a current-limiting resistor, and insufficient charging current or inability to charge the mine lamp during charging.

Description

Technical Field

[0001] This invention relates to the field of coal mining, and more particularly to an ia-level protection device and system for mine lamps. Background Technology

[0002] In the coal mining sector, according to the requirements of the Safety Standards Center, mining lamps integrating audio-visual, positioning, and sensing functions need to have an ia (or Ia) protection level. The ia level requires that, under specified conditions, the intrinsically safe circuit in electrical equipment with ia protection level should not cause ignition. In ia protection level circuits, three series-connected blocking diodes are permitted. Other semiconductors and controllable semiconductor devices can also be used as series current limiters, but only for ib or ic protection level equipment. To limit power, ia protection level equipment can also use series current limiters composed of controllable and uncontrollable semiconductor devices.

[0003] Based on the above requirements, existing mine lamp (battery) protection boards face the following challenges in order to meet these requirements:

[0004] 1. Because protection boards of the ia level must have current-limiting resistors, the operating current is large when functions such as audio / video, positioning, and sensing are enabled, resulting in a large voltage drop.

[0005] 2. If the operating current is intermittent or pulsed, the audio / video, positioning, and sensing functions, as well as the miner's lamp, all have their voltage reduced by a current-limiting resistor. Since the pulsed current will cause a pulse voltage drop, it will cause the miner's lamp to flicker.

[0006] 3. When charging a miner's lamp, if the charging current is insufficient and a certain function, such as positioning, cannot be turned off, it may cause the charging time to be too long; or due to insufficient trickle charging current, it may never be able to charge. Summary of the Invention

[0007] Based on the above problems, this invention proposes an IA-level protection board and system for mine lamps, solving the technical problems of mine lamp flickering caused by adding current-limiting resistors to mine lamps in the prior art, and insufficient charging current or inability to charge the mine lamp during charging. The IA-level protection board for mine lamps provided by this invention provides IA-level protection for both the mine lamp and the load through a multi-channel approach. With the addition of current-limiting resistors, it avoids mutual interference between the load and the lamp board, ensuring stable operation of the mine lamp.

[0008] This invention proposes an ia-level protection board for mining lamps, comprising:

[0009] Series-connected protection circuits and parallel-connected circuits;

[0010] The parallel circuit includes multiple parallel branches. One of the parallel branches is connected to the negative terminal of an external miner's lamp board. The other parallel branches are connected in series with a current-limiting resistor and a detection circuit, and then connected to the negative terminal of an external load.

[0011] The positive terminal of the external battery is connected to the positive terminal of the miner's lamp board and the positive terminal of the load, respectively. The negative terminal of the battery is connected to one end of the protection circuit, and the other end of the protection circuit is connected to a parallel circuit.

[0012] If the detection circuit detects that the battery is charging the miner's lamp board, the detection circuit will disconnect the parallel branch, making the current between the load and the negative terminal of the battery zero.

[0013] In addition, the load includes at least one of the following: a positioning module, an audio / video module, and a sensor module.

[0014] In addition, the detection circuit includes at least: a first comparator and a first MOSFET, wherein the gate of the first MOSFET is connected to the voltage output terminal of the first comparator, and the drain of the first MOSFET is connected to the load;

[0015] When the voltage at the negative terminal of the battery is higher than that of the lamp board, the first MOSFET is turned on and the load works normally; when the voltage at the negative terminal of the battery is lower than that of the lamp board, the first comparator controls the first MOSFET to be turned off and the load stops working.

[0016] In addition, the protection circuit includes at least: chip U2, chip U3, second MOSFET switch Q2 and third MOSFET switch Q3, with U2 and Q3, and U3 and Q2 forming a two-stage semiconductor protection circuit;

[0017] When there is overvoltage, overcurrent or overcharge in the circuit where the negative terminal of the battery is located, U2 and U3 control Q3 and Q2 to be cut off respectively.

[0018] In addition, both chip U2 and chip U3 are lithium battery protection chips.

[0019] This invention also proposes an ia-level protection system for a mining lamp, comprising:

[0020] ia-level protection board, lamp board, battery and load for mining lamps;

[0021] The ia-level protection board for mining lamps includes:

[0022] Series-connected protection circuits and parallel-connected circuits;

[0023] The parallel circuit includes multiple parallel branches. One of the parallel branches is connected to the negative terminal of an external miner's lamp board. The other parallel branches are connected in series with a current-limiting resistor and a detection circuit, and then connected to the negative terminal of an external load.

[0024] The positive terminal of the external battery is connected to the positive terminal of the miner's lamp board and the positive terminal of the load, respectively. The negative terminal of the battery is connected to one end of the protection circuit, and the other end of the protection circuit is connected to a parallel circuit.

[0025] If the detection circuit detects that the battery is charging the miner's lamp board, the detection circuit will disconnect the parallel branch, making the current between the load and the negative terminal of the battery zero.

[0026] In addition, the load includes at least one of the following: a positioning module, an audio / video module, and a sensor module.

[0027] In addition, the detection circuit includes at least: a first comparator and a first MOSFET, wherein the gate of the first MOSFET is connected to the voltage output terminal of the first comparator, and the drain of the first MOSFET is connected to the load;

[0028] When the voltage at the negative terminal of the battery is higher than that of the lamp board, the first MOSFET is turned on and the load works normally; when the voltage at the negative terminal of the battery is lower than that of the lamp board, the first comparator controls the first MOSFET to be turned off and the load stops working.

[0029] In addition, the protection circuit includes at least: chip U2, chip U3, second MOSFET switch Q2 and third MOSFET switch Q3, with U2 and Q3, and U3 and Q2 forming a two-stage semiconductor protection circuit;

[0030] When there is overvoltage, overcurrent or overcharge in the circuit where the negative terminal of the battery is located, U2 and U3 control Q3 and Q2 to be cut off respectively.

[0031] In addition, both chip U2 and chip U3 are lithium battery protection chips.

[0032] This invention solves the technical problems in the prior art that cause flickering in mining lamps due to the addition of current-limiting resistors, and insufficient charging current or inability to charge the lamps during charging. The ia-level protection board for mining lamps provided by this invention uses a multi-channel approach to provide ia-level protection for both the lamp and the load. With the addition of current-limiting resistors, it avoids mutual interference between the load and the lamp board, ensuring stable operation of the mining lamp. Attached Figure Description

[0033] Figure 1 This is an overall schematic diagram of an ia-level protection board for a mining lamp provided in an embodiment of the present invention;

[0034] Figure 2 A circuit connection diagram of an ia-level protection board for a mining lamp provided according to an embodiment of the present invention;

[0035] Figure 3 A circuit diagram of a detection circuit for an ia-level protection board for a mining lamp, provided according to an embodiment of the present invention;

[0036] Figure 4 A circuit diagram of a protection circuit for an ia-level protection board for a mining lamp, provided according to an embodiment of the present invention;

[0037] Figure 5 The present invention provides an overall circuit diagram of the protection circuit and detection circuit of an ia-level protection board for a mining lamp according to an embodiment of the present invention. Detailed Implementation

[0038] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings. This description is intended only to illustrate specific embodiments of the invention and does not constitute any limitation on the invention. The scope of protection of the invention is defined by the claims.

[0039] Reference Figure 1 and Figure 2 This invention proposes an ia-level protection board for mining lamps, comprising:

[0040] Series-connected protection circuits and parallel-connected circuits;

[0041] The parallel circuit includes multiple parallel branches. One of the parallel branches is connected to the negative terminal of an external miner's lamp board. The other parallel branches are connected in series with a current-limiting resistor and a detection circuit, and then connected to the negative terminal of an external load.

[0042] The positive terminal of the external battery is connected to the positive terminal of the miner's lamp board and the positive terminal of the load, respectively. The negative terminal of the battery is connected to one end of the protection circuit, and the other end of the protection circuit is connected to a parallel circuit.

[0043] If the detection circuit detects that the battery is charging the miner's lamp board, the detection circuit will disconnect the parallel branch, making the current between the load and the negative terminal of the battery zero.

[0044] Figure 1 and Figure 2 The medium load is illustrated using a positioning module as an example. The lamp head refers to the lamp head of a mining lamp. Figure 2 The battery cell in the text is the battery.

[0045] In this field, standard charging sockets are typically used for charging mining lamps, which clip onto the lamp head for charging. However, as the current required by mining lamps has increased, it has become difficult for manufacturers to retain the traditional lamp head charging method, leading them to adopt a method of adding a separate charging port. However, this method of adding a separate charging port does not conform to commonly used industry standards.

[0046] This embodiment, while retaining the traditional lamp head charging method, enables a mining lamp (i.e., a smart mining lamp) that integrates audio and video, positioning, and sensing functions to meet the requirements of the ia level.

[0047] In existing technologies, adding a current-limiting resistor between the battery and the charging board results in a significant voltage drop, causing many load functions of the miner's lamp to malfunction. Therefore, existing technologies cannot guarantee the normal operation of all functions of the miner's lamp when it meets the AI ​​rating. This invention, for the first time, proposes connecting the current-limiting resistor in parallel to the miner's lamp and different loads (i.e., electrical appliances), ensuring that the miner's lamp and different loads do not interfere with each other.

[0048] In existing technologies, when a load (electrical appliance) is turned on and off, it creates current pulses. These pulses can suddenly increase the current, such as from 1mA to 100mA. This sudden increase in current causes the miner's lamp to flicker and become unstable. The present invention, by connecting current-limiting resistors in parallel to the miner's lamp and different loads (i.e., electrical appliances), does not affect the operation of the miner's lamp, fundamentally solving the technical problem of flickering.

[0049] To meet the ia-level protection requirements, a pure resistance of at least 0.5 ohms is required on the output side of the battery. Therefore, the protection board is divided into two or more paths: the positive terminal of the battery is shared, and the negative terminal of the battery is separated into two or more paths after passing through the protection circuit (i.e., semiconductor protection circuit and fuse). Each parallel branch is connected to a current-limiting resistor to achieve ia-level protection. The multiple parallel branches can significantly reduce the voltage drop of the battery while meeting the intrinsic safety requirements of ia-level protection. Figure 2 The two paths are the (charging) lamp board path and the positioning path.

[0050] The lamp board refers to the LED circuit board in the head of a mining lamp, responsible for emitting light. The industry also places the charging circuitry on the lamp board for charging. The positioning circuitry broadly refers to all other functions of a mining lamp, such as positioning, audio / video, and sensors.

[0051] Because the two circuits are connected in parallel, current fluctuations in the positioning circuit do not affect the voltage of the lamp board circuit, thus preventing lamp flickering. Simultaneously, the current consumed by the lamp board does not affect the voltage drop of the positioning circuit, which is beneficial to its stability. The protection board also includes a detection circuit that shuts off the positioning circuit when charging is detected, preventing abnormal charging caused by power consumption in the positioning circuit during trickle charging.

[0052] Figure 2 This example uses two parallel branches. In actual use, it can be expanded to multiple branches, with each parallel branch corresponding to a load.

[0053] When the battery discharges, current flows from the battery to the lamp head and the positioning plate; when the battery charges, current flows back from the lamp head into the battery. This embodiment determines whether the miner's lamp is charging by detecting the direction of the current. The positioning plate is turned off during charging to prevent interference with trickle charging, which could prevent the lamp from charging properly.

[0054] This embodiment solves the technical problems in the prior art that cause flickering in the mining lamp due to the addition of a current-limiting resistor, and that insufficient charging current or inability to charge the lamp during charging. The ia-level protection board for mining lamps provided in this embodiment uses a multi-channel approach to provide ia-level protection for both the lamp and the load. With the addition of the current-limiting resistor, it avoids mutual interference between the load and the lamp board, ensuring stable operation of the mining lamp.

[0055] In one embodiment, the payload includes at least one of a positioning module, an audio / video module, and a sensor module.

[0056] Reference Figure 3 In one embodiment, the detection circuit includes at least: a first comparator U1 and a first MOSFET Q1, wherein the gate of the first MOSFET Q1 is connected to the voltage output terminal of the first comparator U1, and the drain of the first MOSFET Q1 is connected to the load.

[0057] When the voltage at the negative terminal of the battery is higher than that of the lamp board, the first MOSFET is turned on and the load works normally; when the voltage at the negative terminal of the battery is lower than that of the lamp board, the first comparator U1 controls the first MOSFET to be turned off and the load stops working.

[0058] This embodiment designs a "disconnect during charging" detection circuit. When charging (the first MOS transistor detects charging), the first comparator U1 controls the gate of the first MOS transistor Q1 to disconnect the current limiting resistor from the load.

[0059] When the battery discharges, current flows from the battery to the lamp head and the positioning plate; when the battery charges, current flows back from the lamp head into the battery. The initial charging process is trickle charging, with a relatively low current. If the positioning plate continues to operate, the miner's lamp will not be able to charge.

[0060] Therefore, this embodiment determines whether the miner's lamp is charging by detecting the direction of the current. During charging, the positioning plate is shut off to prevent interference with trickle charging, which could prevent charging from proceeding. Furthermore, the circuit-breaking method in this embodiment also acts as a hard reset for the positioning circuit, which is beneficial to the stability of the equipment.

[0061] U1 and Q1 form a charging detection circuit. U1 is a low-power comparator. When the negative voltage of the battery is higher than that of the lamp holder (due to the voltage drop caused by the current-limiting resistor), it indicates that the circuit is in a discharging state. At this time, Q1 conducts, and the positioning circuit can work normally. When the negative voltage of the battery is lower than that of the lamp holder (due to the voltage drop caused by the current-limiting resistor, but in the opposite direction), U1 controls Q1 to cut off, and the positioning circuit stops working.

[0062] This embodiment avoids the problem of abnormal charging caused by power consumption of the positioning path during trickle charging.

[0063] Reference Figure 4 In one embodiment, the protection circuit includes at least: chip U2, chip U3, second MOSFET switch Q2 and third MOSFET switch Q3, with U2 and Q3, and U3 and Q2 forming a two-stage semiconductor protection circuit;

[0064] When there is overvoltage, overcurrent or overcharge in the circuit where the negative terminal of the battery is located, U2 and U3 control Q3 and Q2 to be cut off respectively.

[0065] U2 and U3 are protection chips, and Q2 and Q3 are MOSFET switches. U2 and Q3, along with U3 and Q2, form a two-stage semiconductor protection circuit with overvoltage and overcurrent protection functions. In the event of overvoltage or overcurrent, U2 and U3 control pins 4 and 6 (gates) of Q3 and Q2 respectively via pins 1 / 3, causing them to cut off. Because it is a two-stage independent protection circuit, this circuit can still ensure battery safety even if any of the above components fail.

[0066] In one embodiment, both chip U2 and chip U3 are lithium battery protection chips.

[0067] Reference Figure 1 , Figure 2 and Figure 5 The present invention also proposes an ia-level protection system for a mining lamp, comprising:

[0068] ia-level protection board, lamp board, battery and load for mining lamps;

[0069] The ia-level protection board for mining lamps includes:

[0070] Series-connected protection circuits and parallel-connected circuits;

[0071] The parallel circuit includes multiple parallel branches. One of the parallel branches is connected to the negative terminal of an external miner's lamp board. The other parallel branches are connected in series with a current-limiting resistor and a detection circuit, and then connected to the negative terminal of an external load.

[0072] The positive terminal of the external battery is connected to the positive terminal of the miner's lamp board and the positive terminal of the load, respectively. The negative terminal of the battery is connected to one end of the protection circuit, and the other end of the protection circuit is connected to a parallel circuit.

[0073] If the detection circuit detects that the battery is charging the miner's lamp board, the detection circuit will disconnect the parallel branch, making the current between the load and the negative terminal of the battery zero.

[0074] This embodiment solves the technical problems in the prior art that cause flickering in the mining lamp due to the addition of a current-limiting resistor, and that insufficient charging current or inability to charge the lamp during charging. The ia-level protection board for mining lamps provided in this embodiment uses a multi-channel approach to provide ia-level protection for both the lamp and the load. With the addition of the current-limiting resistor, it avoids mutual interference between the load and the lamp board, ensuring stable operation of the mining lamp.

[0075] In one embodiment, the payload includes at least one of a positioning module, an audio / video module, and a sensor module.

[0076] Reference Figure 3 In one embodiment, the detection circuit includes at least: a first comparator U1 and a first MOSFET Q1, wherein the gate of the first MOSFET Q1 is connected to the voltage output terminal of the first comparator U1, and the drain of the first MOSFET Q1 is connected to the load.

[0077] When the voltage at the negative terminal of the battery is higher than that of the lamp board, the first MOSFET is turned on and the load works normally; when the voltage at the negative terminal of the battery is lower than that of the lamp board, the first comparator U1 controls the first MOSFET to be turned off and the load stops working.

[0078] This embodiment designs a "disconnect during charging" detection circuit. When charging (the first MOS transistor detects charging), the first comparator U1 controls the gate of the first MOS transistor Q1 to disconnect the current limiting resistor from the load.

[0079] When the battery discharges, current flows from the battery to the lamp head and the positioning plate; when the battery charges, current flows back from the lamp head into the battery. The initial charging process is trickle charging, with a relatively low current. If the positioning plate continues to operate, the miner's lamp will not be able to charge.

[0080] Therefore, this embodiment determines whether the miner's lamp is charging by detecting the direction of the current. During charging, the positioning plate is shut off to prevent interference with trickle charging, which could prevent charging from proceeding. Furthermore, the circuit-breaking method in this embodiment also acts as a hard reset for the positioning circuit, which is beneficial to the stability of the equipment.

[0081] U1 and Q1 form a charging detection circuit. U1 is a low-power comparator. When the negative voltage of the battery is higher than that of the lamp holder (due to the voltage drop caused by the current-limiting resistor), it indicates that the circuit is in a discharging state. At this time, Q1 conducts, and the positioning circuit can work normally. When the negative voltage of the battery is lower than that of the lamp holder (due to the voltage drop caused by the current-limiting resistor, but in the opposite direction), U1 controls Q1 to cut off, and the positioning circuit stops working.

[0082] This embodiment avoids the problem of abnormal charging caused by power consumption of the positioning path during trickle charging.

[0083] Reference Figure 4 In one embodiment, the protection circuit includes at least: chip U2, chip U3, second MOSFET switch Q2 and third MOSFET switch Q3, with U2 and Q3, and U3 and Q2 forming a two-stage semiconductor protection circuit;

[0084] When there is overvoltage, overcurrent or overcharge in the circuit where the negative terminal of the battery is located, U2 and U3 control Q3 and Q2 to be cut off respectively.

[0085] U2 and U3 are protection chips, and Q2 and Q3 are MOSFET switches. U2 and Q3, along with U3 and Q2, form a two-stage semiconductor protection circuit with overvoltage and overcurrent protection functions. In the event of overvoltage or overcurrent, U2 and U3 control pins 4 and 6 (gates) of Q3 and Q2 respectively via pins 1 / 3, causing them to cut off. Because it is a two-stage independent protection circuit, this circuit can still ensure battery safety even if any of the above components fail.

[0086] In one embodiment, both chip U2 and chip U3 are lithium battery protection chips.

[0087] The above description is merely the principle and preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several other modifications can be made based on the principle of the present invention, and these modifications should also be considered within the scope of protection of the present invention.

Claims

1. An ia-level protection board for mining lamps, characterized in that, include: Series-connected protection circuits and parallel-connected circuits; The parallel circuit includes multiple parallel branches. One of the parallel branches is connected to the negative terminal of an external miner's lamp board. The other parallel branches are connected in series with a current-limiting resistor and a detection circuit, and then connected to the negative terminal of an external load. The positive terminal of the external battery is connected to the positive terminal of the miner's lamp board and the positive terminal of the load, respectively. The negative terminal of the battery is connected to one end of the protection circuit, and the other end of the protection circuit is connected to a parallel circuit. If the detection circuit detects that the battery is charging the miner's lamp board, the detection circuit will disconnect the parallel branch, so that the current between the load and the negative terminal of the battery is 0. The detection circuit includes at least: a first comparator and a first MOSFET, wherein the gate of the first MOSFET is connected to the voltage output terminal of the first comparator, and the drain of the first MOSFET is connected to the load; When the voltage at the negative terminal of the battery is higher than that of the lamp board, the first MOSFET is turned on and the load works normally; when the voltage at the negative terminal of the battery is lower than that of the lamp board, the first comparator controls the first MOSFET to be turned off and the load stops working.

2. The ia-level protection board for miners' lamps according to claim 1, characterized in that, The load includes at least one of the following: a positioning module, an audio / video module, and a sensor module.

3. The ia-level protection board for mining lamps according to claim 1, characterized in that, The protection circuit includes at least: chip U2, chip U3, second MOSFET switch Q2 and third MOSFET switch Q3. U2 and Q3, and U3 and Q2 form a two-stage semiconductor protection circuit. When there is overvoltage, overcurrent or overcharge in the circuit where the negative terminal of the battery is located, U2 and U3 control Q3 and Q2 to be cut off respectively.

4. The ia-level protection board for miners' lamps according to claim 3, characterized in that, Both chip U2 and chip U3 are lithium battery protection chips.

5. A mine lamp ia-level protection system, characterized in that, include: ia-level protection board, lamp board, battery and load for mining lamps; The ia-level protection board for mining lamps includes: Series-connected protection circuits and parallel-connected circuits; The parallel circuit includes multiple parallel branches. One of the parallel branches is connected to the negative terminal of an external miner's lamp board. The other parallel branches are connected in series with a current-limiting resistor and a detection circuit, and then connected to the negative terminal of an external load. The positive terminal of the external battery is connected to the positive terminal of the miner's lamp board and the positive terminal of the load, respectively. The negative terminal of the battery is connected to one end of the protection circuit, and the other end of the protection circuit is connected to a parallel circuit. If the detection circuit detects that the battery is charging the miner's lamp board, the detection circuit will disconnect the parallel branch, so that the current between the load and the negative terminal of the battery is 0. The detection circuit includes at least: a first comparator and a first MOSFET, wherein the gate of the first MOSFET is connected to the voltage output terminal of the first comparator, and the drain of the first MOSFET is connected to the load; When the voltage at the negative terminal of the battery is higher than that of the lamp board, the first MOSFET is turned on and the load works normally; when the voltage at the negative terminal of the battery is lower than that of the lamp board, the first comparator controls the first MOSFET to be turned off and the load stops working.

6. The ia-level protection system for miners' lamps according to claim 5, characterized in that, The load includes at least one of the following: a positioning module, an audio / video module, and a sensor module.

7. The ia-level protection system for miners' lamps according to claim 5, characterized in that, The protection circuit includes at least: chip U2, chip U3, second MOSFET switch Q2 and third MOSFET switch Q3. U2 and Q3, and U3 and Q2 form a two-stage semiconductor protection circuit. When there is overvoltage, overcurrent or overcharge in the circuit where the negative terminal of the battery is located, U2 and U3 control Q3 and Q2 to be cut off respectively.

8. The ia-level protection system for miners' lamps according to claim 7, characterized in that, Both chip U2 and chip U3 are lithium battery protection chips.

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