Interface circuit of automatic light-changing filter lens and human body safety protection equipment

Abstract

The utility model relates to an interface circuit of an automatic light-changing filter lens and human body safety protection equipment. The interface circuit comprises a control circuit 8 and a socket 501, the control circuit 8 comprises a diode D1 and a pull-up resistor R1, a first pin VBUS of the socket 501 is connected with a negative electrode of the diode D1 and a positive electrode of the charging circuit 20, a positive electrode of the diode D1 is connected with an I / O pin of the MCU processor 1 for control and is connected with a power supply end VCC1 of the MCU processor 1 through the pull-up resistor R1, and a second pin VBUS of the socket 501 is connected with a negative electrode of the charging circuit 20. And a second pin GND of the socket 501 is connected with the MCU processor 1 and the grounding end of the charging circuit 20. Therefore, the same socket not only can be used for charging, but also can be used for controlling the automatic light-changing filter lens. When a charging line is inserted for charging, the socket and the MCU processor 1 are isolated by a reversely connected diode D1, and when a key line is inserted, the diode D1 is in forward connection, and the potential of an I / O pin of the MCU processor 1 can be controlled externally.

Description

Technical Field

[0001] The utility model relates to an interface circuit of an automatic light-dimming filter and human body safety protection equipment, in particular to an interface circuit structure installed on the side of the automatic light-dimming filter and used for connecting a charging line and a key line. Background Art

[0002] As human safety protection equipment, welding helmets are worn during welding operations to prevent the face and eyes from being exposed to strong welding light environments, playing a protective role. Welding helmets with automatic dimming filters (hereinafter referred to as "filters") can also automatically darken after arcing, which not only protects the welder's eyes from strong welding light, but also provides a bright field of view before arcing, helping the welder to position correctly and improve welding efficiency.

[0003] The surface of the auto-darkening filter is usually covered with a transparent protective sheet to prevent the expensive auto-darkening filter from being damaged by splashing droplets. The transparent protective sheet is a consumable and needs to be replaced at any time.

[0004] In addition to using built-in button control, the automatic dimming filter also contains some button functions that require external control, such as turning on the headlights and one-button grinding. Therefore, the automatic dimming filter needs to lead out a separate button line, or set an interface on the automatic dimming filter, use a plug-in method to lead out the button line, and connect it to the external button installed on the side of the welding mask. The automatic dimming filter is operated by the external external button. In this way, when wearing it, the welder can also conveniently control some functions on the automatic dimming filter, such as turning on the headlights and one-button grinding.

[0005] However, the existing connection method of the automatic dimming filter and the external button has the following problems. The interface is set on the automatic dimming filter, and the button line is installed in the form of the interface, which will lead to a complex structure of the automatic dimming filter panel. For the automatic dimming filter with a charging interface on the panel, two interfaces need to be set at the same time, which not only takes up more installation space, but also requires identification of each interface when charging or installing the button line; the structure of directly leading the button line from the automatic dimming filter will affect the disassembly and assembly of the automatic dimming filter, for example, it will make it difficult to replace the consumables of the automatic dimming filter such as the transparent protective sheet. Utility Model Content

[0006] The purpose of the utility model is to solve the above problems of the prior art and provide an interface circuit of a dimmer filter with a simple structure and multiplexable charging and key lines and a human body safety protection device.

[0007] The first technical solution of the utility model is an interface circuit of an automatic dimming filter, the automatic dimming filter comprises a filter lens, an MCU processor 1 for controlling the filter lens, a rechargeable battery 2, and a charging circuit 20. It is characterized in that the interface circuit 9 of the automatic dimming filter comprises a control circuit 8 and a socket 501. The control circuit 8 comprises a diode D1 and a pull-up resistor R1, the socket 501 as a socket for key wiring and charging wiring multiplexed has at least a first pin and a second pin, the first pin as a power supply / key pin VBUS connected to the cathode of the diode D1 and the anode of the charging circuit 20, the anode of the diode D1 is connected to the I / O pin of the MCU processor 1, and is connected to the power supply terminal VCC1 of the MCU processor 1 through the pull-up resistor R1.

[0008] The second pin GND is used as a ground and is connected to the ground terminals of the MCU processor 1 and the charging circuit 20 .

[0009] Therefore, when the rechargeable battery 2 is charged by inserting the charging cable into the socket 501, since the charging voltage VCC2 is higher than the power supply voltage VCC1 of the MCU processor 1, the diode D1 is in reverse connection and plays an isolation role. The I / O pin potential of the MCU processor 1 will not be affected by the charging power supply, thereby avoiding the impact of charging on the MCU processor 1.

[0010] When the key line for installing an external key is inserted into the socket 501, the diode D1 is in forward connection, and the I / O pin potential of the MCU processor 1 can be changed through the external key to input a control signal.

[0011] That is, by utilizing the interface circuit of the automatic dimming filter, the interface of the charging and key lines can be shared without affecting the original functions.

[0012] Preferably, a decoupling capacitor C1 is connected in parallel between the I / O pin of the MCU processor 1 and the ground terminal for filtering, so that the influence of mechanical jitter of the external key K1 and the internal key K2 can be eliminated.

[0013] Preferably, the automatic dimming filter 61 is provided with a built-in button K2, and the two end pins of the built-in button K2 are connected to the I / O pin and the ground terminal of the MCU processor 1. Therefore, the I / O pin potential of the MCU processor 1 can be controlled by using both the built-in button K2 and the external button K1.

[0014] The automatic dimming filter may further include a headlamp 401, a drive circuit 41, and a headlamp control circuit. Both ends of the socket 501 are connected to the headlamp control circuit. The headlamp control circuit controls the lighting and shutting of the headlamp 401 according to the potential change between the first pin and the bottom second pin in the socket. The headlamp control circuit is an independent circuit or is implemented by the MCU processor 1.

[0015] Therefore, the headlight 401 can be turned on and off by the external button K1.

[0016] Preferably, the socket 501 is a USB interface socket, for example, a TYPE-C USB interface socket, the first pin is the VBUS terminal, and the second pin GND is the GND terminal.

[0017] Based on the same design concept, the utility model also provides human body safety protection equipment.

[0018] The human body safety protection equipment includes a wearable device and an automatic dimming filter and a button connection 503 installed on the wearable device.

[0019] The automatic dimming filter is mounted on the housing 6 and any of the above automatic dimming filters is used.

[0020] One end of the button wiring 503 is equipped with a plug 502 corresponding to the socket 501 on the automatic dimming filter, and the other end is equipped with an external button K1. The plug at one end of the button wiring 503 can be plugged into the socket 501, and the external button K1 at the other end is installed on the wearable device.

[0021] The human safety protection equipment may be a welding mask, and the wearable device may be a mask shell 6 .

[0022] Therefore, the external button K1 can be connected to the interface circuit of the automatic dimming filter only by inserting the plug 502 at one end of the button wiring 503 into the socket 501.

[0023] In summary, the present invention provides an interface circuit that can charge a built-in rechargeable battery and control an automatic dimming filter, that is, by using the diode D1 and the voltage difference between the charging voltage and the power supply terminal of the MCU processor 1, the socket can be used as a charging line socket and as a socket for the key wiring 503. During charging, due to the isolation effect of the diode D1, the charging power supply and the MCU processor 1 will not be affected by the charging.

[0024] The utility model has a simple structure, a sophisticated design and strong practicality, can greatly simplify the structure of the automatic darkening filter, can facilitate the wearer to disassemble and assemble the automatic darkening filter, and enables the wearer to easily replace consumables for the automatic darkening filter such as a transparent protective sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a structural illustration of a welding mask connected to an external button in an embodiment;

[0026] Figure 2 is a diagram illustrating the principle of connecting an external button to the interface circuit of the automatic dimming filter of the embodiment;

[0027] Figure 3 is a structural diagram illustrating the interface circuit of the automatic dimming filter of the embodiment when it is connected to an external button;

[0028] Figure 4 is a structural diagram illustrating a welding mask connected to a charging power source in an embodiment;

[0029] Figure 5 is a diagram illustrating the principle of connecting the interface circuit of the automatic dimming filter of the embodiment to a charging power source;

[0030] Figure 6 1. It is a structural diagram illustrating the interface circuit of the automatic dimming filter of the embodiment when it is connected to a charging power source.

[0031] Reference numerals:

[0032] 1-MCU processor; 2-rechargeable battery; K1-external button; K2-built-in button; 41-driving circuit; 401-headlight; 501-socket; 502-male connector for button; 503-connection for button; 504-male connector for charging; 505-connection for charging; 511-protective cover; 6-housing; 61-automatic dimming filter; 62-installation port; 600-circuit board; 7-charging power supply; 8-control circuit; interface circuit 9; D1-diode; R1-pull-up resistor; C1-decoupling capacitor; VCC1-power supply voltage of MCU processor; VCC2-charging voltage. DETAILED DESCRIPTION

[0033] The following takes the welding helmet as an example and combines the drawings to elaborate on the embodiments and variations of the human body safety protection equipment equipped with a variable light filter. The following description is a concretization of the claims of the utility model. Example

[0034] In this embodiment, a headlight system for lighting is installed on the dimmer filter.

[0035] Figure 1 , Figure 4The structures of connecting the welding mask to an external button and a charging power supply are shown respectively, which are the states of the welding mask when in use and when charging.

[0036] like Figure 1 , 4 As shown, the welding helmet has a mask shell (hereinafter referred to as shell) 6 that can be worn by the wearer. The shell 6 is provided with an opening corresponding to the position of the wearer's eyes, and an automatic darkening filter 61 is detachably mounted on the opening.

[0037] See also Figure 1 In addition to the dimming lens 610 in the middle, the automatic dimming filter 61 is also provided with a headlight 401 for lighting. The key wiring 503 is inserted into the socket of the automatic dimming filter 61. An open mounting port 62 is provided on the side of the housing 6. The external key K1 on the key wiring 503 is fixed to the mounting port 62 by bolts. The wearer can press the external key K1 from the outside of the housing 6 to control the functions of the automatic dimming filter 61, such as turning on the headlight, one-key grinding (even after the welding arc is detected, the color level of the dimming lens 610 will not change). The internal side of the automatic dimming filter 61 is also provided with a built-in key K2. The function of the built-in key K2 is the same as that of the external key K1. The wearer can also turn on the headlight by pressing the built-in key K2.

[0038] Figure 2 and Figure 3 The schematic diagram and circuit diagram of the interface circuit 9 connected to the key wiring 503 are shown respectively. Figure 5 and Figure 6 The schematic diagram and circuit diagram are respectively shown when the interface circuit 9 is connected to a charging power source.

[0039] Combination Figures 1 to 6 As can be seen, the circuit board 600 is provided with a built-in button K2 for controlling the switch of the headlight 401, adjusting the brightness and other functions, an MCU processor 1 and a driving circuit 41, a rechargeable battery 2 for supplying power to the MCU processor 1 and the driving circuit 41, a charging circuit 20 for connecting a charging power source 7 to charge the rechargeable battery 2, and an interface circuit 9.

[0040] The interface circuit 9 includes a control circuit 8 and a socket 501. One end of the key wiring 503 is provided with an external key K1, and the other end is provided with a male connector matching the socket 501, namely, a key connector 502. One end of the charging wiring 505 is provided with a male connector matching the socket 501, namely, a charging connector 504.

[0041] In this embodiment, the socket 501, the button wiring 503, and the button male connector 502 all comply with the Type-C protocol standard, and the button wiring 503 and the charging wiring 505 contain at least two wire cores.

[0042] The control circuit 8 includes a diode D1 , a pull-up resistor R1 , and a decoupling capacitor C1 .

[0043] The connection relationship of the above structure is as follows:

[0044] Combination Figure 2 , 3 , 5, and 6, the I / O pin of the MCU processor 1 is connected to the power supply terminal of the MCU processor 1 through the pull-up resistor R1 as an input pin, and the I / O pin is connected to the VBUS pin of the socket 501 through the diode D1. The positive electrode of the diode D1 is connected to the I / O pin of the MCU processor 1, and the negative electrode is connected to the VBUS pin of the socket 501.

[0045] The positive electrode of the charging circuit 20 is respectively connected to the VBUS pin of the socket 501 , and the negative electrode is connected as the ground and GND pin, for charging the rechargeable battery 2 .

[0046] The two end pins of the built-in button K2 are connected to the I / O pin and the ground respectively.

[0047] The two ends of the built-in key K2 are also connected in parallel with a decoupling capacitor C1 to eliminate the influence of mechanical jitter of the external key K1 and the built-in key K2.

[0048] like Figure 1 , 2 As shown in Figure 3, when the wearer uses a welding helmet for welding:

[0049] Insert the key male connector 502 of the key wiring 503 into the socket 501, and use the external key K1 of the key wiring 503 to control turning on the headlight, one-key grinding, etc. Figure 2 As shown, the rechargeable battery 2 is used as a power source to supply power to the entire automatic dimming filter 61 including the MCU processor 1 , the driving circuit 41 and the headlight 401 .

[0050] like Figure 3 As shown, the two end pins of the external button K1 are respectively connected to the VBUS pin and the GND pin of the button male connector 502 .

[0051] Therefore, if the external key K1 and the built-in key K2 are not pressed, the I / O pin is detected to be at a high level; if the external key K1 or the built-in key K2 is pressed, the MCU processor 1 detects that the I / O pin is at a low level.

[0052] That is, see Figure 2When the wearer is performing welding work, the rechargeable battery 2 supplies power to the MCU processor 1 and the drive circuit 41. If the wearer needs to control the opening and closing of the headlight 401 or adjust the brightness of the headlight 401, the wearer only needs to raise his hand and press the external button K1 set on the outside of the shell 6, or press the built-in button K2 located on the inside of the filter lens 61.

[0053] The MCU processor 1 detects the level change on the I / O pin, that is, whether the external button K1 and the internal button K2 are pressed and the number of times they are pressed, and then uses the driving circuit 41 to control the opening and closing of the headlight 401 or adjust the brightness of the headlight 401 according to the detection result.

[0054] In this process, the diode D1 is in forward connection, and the I / O pin level of the MCU processor 1 can be controlled by pressing the external button K1.

[0055] like Figure 4 , 5 As shown in Figure 6, when the wearer takes off the welding helmet and charges the rechargeable battery:

[0056] Pull out the key wiring 503 from the socket 501, insert the charging male connector 504 of the charging wiring 505 into the socket 501, and connect the charging power source 7 and the charging circuit 20 using the charging wiring 505 to charge the rechargeable battery 2.

[0057] like Figure 6 As shown, the VBUS pin and the GND pin of the charging male connector 504 are connected to the charging power source 7 through wiring.

[0058] During the charging process, the charging voltage VCC2 of the charging power source 7 is higher than the voltage terminal voltage VCC1 of the MCU processor 1 , and the diode D1 is in a reverse connection state, isolating the MCU processor 1 and the charging power source 7 , thereby preventing the charging from affecting the MCU processor 1 .

[0059] In this embodiment, the opening and closing of the headlight 401 is controlled by the MCU processor 1, but an independent headlight control circuit can also be set up separately. The signal input end of the headlight control circuit is the same as the MCU processor 1, which is connected to two pins of the socket 501. The headlight 401 is turned on or off according to the change of the potential between the pins. For example, pressing the external button K1 once turns on the headlight 401, and pressing the external button K1 again turns off the headlight 401.

[0060] In summary, the interface circuit provided by the utility model can be used to charge the built-in rechargeable battery and control the automatic light-dimming filter.

[0061] That is to say, the utility model solves the problem in existing welding helmets that the charging interface required by the rechargeable battery and the connection interface required by the external button cannot be shared, and realizes that one socket can be reused to plug in the external button K1 and the charging power supply, which not only simplifies the structure of the automatic dimming filter, but also facilitates the disassembly and assembly of the automatic dimming filter.

[0062] It is worth noting that, for ease of understanding, the present invention only shows circuits and welding mask structures related to the technical solution. Those skilled in the art should be able to carry out expansion designs based on the embodiments provided by the present invention, and these designs should fall within the scope of protection of the present invention.

[0063] For example, the charging circuit 20 and the charging power supply 7 may have a circuit structure that facilitates safe charging and discharging; the MCU processor 1, the drive circuit 41, the rechargeable battery 2, etc. should also have a circuit structure for realizing the function; the utility model should also be applicable to welding masks with other functions besides controlling headlights and "one-piece grinding", etc.

[0064] The utility model provides an interface circuit which can charge a built-in rechargeable battery and control an automatic dimming filter. Only a diode D1 is used to avoid the charging voltage from affecting an MCU processor 1. When a welding mask is used, current enters the MCU processor 1 through the diode D1.

[0065] As human safety protection equipment, it can be not only a welding mask but also any other equipment that needs to be connected with charging wiring and button wiring.

[0066] The utility model has a simple structure, a sophisticated design and strong practicality, can greatly simplify the structure of the automatic darkening filter, can facilitate the wearer to disassemble and assemble the automatic darkening filter, and enables the wearer to easily replace consumables for the automatic darkening filter such as a transparent protective sheet.

Claims

1. An interface circuit for an automatic dimming filter, the automatic dimming filter comprising a filter lens, an MCU processor (1) for controlling the filter lens, a rechargeable battery (2), and a charging circuit (20). It is characterized in that The interface circuit (9) of the automatic dimming filter comprises a control circuit (8) and a socket (501). The control circuit (8) comprises a diode (D1) and a pull-up resistor (R1). The socket (501) is a socket for multiplexing key wiring and charging wiring and has at least a first pin and a second pin. The first pin is used as a power supply / button pin (VBUS) and is connected to the cathode of the diode (D1) and the anode of the charging circuit (20); the anode of the diode (D1) is connected to an I / O pin of the MCU processor (1) and is connected to the power supply terminal (VCC1) of the MCU processor (1) via the pull-up resistor (R1). The second pin (GND) is connected to the ground of the MCU processor (1) and the charging circuit (20) as a ground.

2. The interface circuit of the automatic darkening filter according to claim 1, characterized in that: A decoupling capacitor (C1) is also connected in parallel between the I / O pin of the MCU processor (1) and the ground terminal.

3. The interface circuit of the automatic darkening filter according to claim 2, characterized in that: The automatic dimming filter (61) is provided with a built-in button (K2), and the pins at both ends of the built-in button (K2) are connected in parallel to the I / O pin and the ground terminal of the MCU processor (1).

4. The interface circuit of the automatic darkening filter according to claim 3, characterized in that: The automatic dimming filter comprises a headlamp (401), a drive circuit (41), and a headlamp control circuit. Both ends of the socket (501) are connected to the headlamp control circuit. The headlamp control circuit controls the lighting and shutting down of the headlamp (401) according to the potential change between the first pin and the bottom second pin in the socket. The headlamp control circuit is an independent circuit or is implemented by the MCU processor (1).

5. The interface circuit of the automatic darkening filter according to any one of claims 1 to 4, characterized in that: The socket (501) is a USB interface female socket.

6. The interface circuit of the automatic darkening filter according to claim 5, characterized in that: The socket (501) is a Type-C USB interface female socket, the first pin is a VBUS terminal, and the second pin (GND) is a GND terminal.

7. Human body safety protection equipment, characterized in that: The human body safety protection equipment includes a wearable device and an automatic dimming filter and a button wiring (503) installed on the wearable device. The automatic dimming filter adopts the interface circuit (9) of the automatic dimming filter according to any one of claims 1 to 6, One end of the key wiring (503) is equipped with a plug (502) corresponding to the socket (501) on the automatic light-dimming filter, and the other end is equipped with an external key (K1). The plug at one end of the button wiring (503) is pluggably inserted into the socket (501), and the external button (K1) at the other end is installed on the wearable device.

8. The human body safety protection equipment according to claim 7, characterized in that: The human body safety protection equipment is a welding mask, and the wearable device is a mask shell (6).

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