Signal transmission circuit for helmet and helmet

Abstract

The present invention discloses a signal transmission circuit for a safety helmet and a safety helmet, comprising: a signal collector connected to a high-pass filtering circuit; the high-pass filtering circuit connected to a signal amplifying circuit; the signal amplifying circuit connected to a rectifier circuit; the rectifier circuit connected to a comparison circuit; the comparison circuit connected to a main control chip of the safety helmet, and used for comparing the biological sensing signal after rectification with a preset first reference voltage, and sending a high-level signal to the main control chip if the voltage value corresponding to the biological sensing signal is greater than the first reference voltage; or comparing the electric field signal after rectification with a preset second reference voltage, and sending a high-level signal to the main control chip if the voltage value corresponding to the electric field signal is greater than the second reference voltage; the above-mentioned arrangement reduces the difficulty of the production process, improves the convenience of the safety helmet and reduces the production cost.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power operation, and in particular to a signal transmission circuit applied to a safety helmet and the safety helmet. Background Art

[0002] Safety helmets are used to protect workers in power grid operations. Workers do not need the electric field warning function of the safety helmets on the way to the work destination. In order to make the safety helmet last longer and effectively use the battery power of the safety helmet, the safety helmet is in shutdown mode during this process. Existing safety helmet products use mechanical buttons, which are generally installed inside the shielding body of the safety helmet. This setting makes the production process more difficult, reduces convenience and increases production costs. Summary of the invention

[0003] Based on this, it is necessary to propose a signal transmission circuit and a safety helmet for use in a safety helmet in order to address the above-mentioned problems.

[0004] A signal transmission circuit applied to a safety helmet, comprising:

[0005] A signal collector, connected to the high-pass filter circuit, for acquiring a biological sensing signal or an electric field signal, and transmitting the biological sensing signal or the electric field signal to the high-pass filter circuit;

[0006] The high-pass filter circuit is connected to the signal amplification circuit, and is used to filter the biological sensing signal or the electric field signal and transmit it to the signal amplification circuit;

[0007] The signal amplifying circuit is connected to the rectifying circuit, and is used to amplify the filtered biological sensing signal or electric field signal and transmit it to the rectifying circuit;

[0008] The rectifier circuit is connected to the comparison circuit and is used to rectify the amplified biological sensing signal or electric field signal and transmit it to the comparison circuit;

[0009] The comparison circuit is connected to the main control chip of the helmet rotor, and is used to compare the rectified biosensing signal with a preset first reference voltage. If the voltage value corresponding to the biosensing signal is greater than the first reference voltage, a high level signal is sent to the main control chip; or compare the rectified electric field signal with a preset second reference voltage. If the voltage value corresponding to the electric field signal is greater than the second reference voltage, a high level signal is sent to the main control chip.

[0010] In one embodiment, the signal collector includes: a first detection piece and a second detection piece;

[0011] The output ends of the first detection chip and the second detection chip are both connected to the high-pass filter circuit.

[0012] In one embodiment, the high-pass filter circuit includes: a first capacitor and a second capacitor;

[0013] One end of the first capacitor is connected to the first detection sheet, and the other end is connected to the signal amplification circuit; the second capacitor is connected to the second detection sheet, and the other end is connected to the signal amplification circuit.

[0014] In one embodiment, the signal amplification circuit includes: a third capacitor and a first operational amplifier;

[0015] The non-inverting input terminal of the first operational amplifier is connected to the end of the second capacitor away from the second detection sheet; the inverting input terminal of the first operational amplifier is grounded; the positive terminal of the first operational amplifier is connected to one end of the third capacitor and an external power supply; the other end of the third capacitor is grounded.

[0016] In one embodiment, the rectifier circuit includes: a diode, a fourth capacitor and a first resistor;

[0017] The anode of the diode is connected to the output end of the first operational amplifier, the cathode of the diode is connected to one end of the first resistor and the comparison circuit, and the other end of the first resistor is grounded; the fourth capacitor is connected in parallel with the first resistor.

[0018] In one embodiment, the comparison circuit includes: a fifth capacitor and a second operational amplifier;

[0019] The inverting input terminal of the second operational amplifier is connected to the cathode of the diode, and the non-inverting input terminal of the second operational amplifier is connected to the external power supply; the output terminal of the second operational amplifier is connected to one end of the fifth capacitor and the main control chip, and the other end of the fifth capacitor is grounded.

[0020] In one embodiment, the high-pass filter circuit further includes: a second resistor;

[0021] One end of the second resistor is connected to an end of the second capacitor away from the second detection sheet, and the other end of the second resistor is grounded.

[0022] In one embodiment, the signal amplification circuit further includes: a fourth resistor and a fifth resistor;

[0023] One end of the fourth resistor is connected to the inverting input terminal of the first operational amplifier, and the other end is grounded;

[0024] One end of the fifth resistor is connected to the inverting input terminal of the first operational amplifier, and the other end of the fifth resistor is connected to the output terminal of the first operational amplifier.

[0025] In one embodiment, the comparison circuit further includes: a sixth resistor and a seventh resistor;

[0026] One end of the sixth resistor is connected to the non-inverting input terminal of the second operational amplifier, and the other end is connected to an external power supply;

[0027] One end of the seventh resistor is connected to the non-inverting input terminal of the second operational amplifier, and the other end of the seventh resistor is connected to the output terminal of the second operational amplifier.

[0028] A safety helmet comprises a helmet body and the signal transmission circuit applied to the safety helmet as described above, wherein the signal transmission circuit applied to the safety helmet is arranged on the helmet body.

[0029] Implementing the embodiments of the present invention will have the following beneficial effects:

[0030] The present application obtains a biosensing signal or an electric field signal through a signal collector, and then transmits it to a high-pass filter circuit for filtering, and then transmits the filtered biosensing signal or electric field signal to a signal amplifier circuit for polarity amplification processing, and the signal amplifier circuit then transmits the amplified biosensing signal or electric field signal to a rectifier circuit for polarity rectification processing, and the rectifier circuit transmits the rectified biosensing signal or electric field signal to a comparison circuit, and the comparison circuit compares the voltage value corresponding to the biosensing signal with a first reference voltage, and if the voltage value corresponding to the biosensing signal is greater than the first reference voltage, a high-level signal is sent to the main control chip; the comparison circuit also compares the electric field signal with a preset second reference voltage, and if the voltage value corresponding to the electric field signal is greater than the second reference voltage, a high-level signal is sent to the main control chip, so that the main control chip controls other circuits in the helmet to work. The above-mentioned setting reduces the difficulty of the production process, improves the convenience of the helmet, and reduces the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] in:

[0033] Figure 1 is a structural block diagram of a signal transmission circuit applied to a helmet in one embodiment;

[0034] Figure 2 The figure is a circuit diagram of a signal collector, a high-pass filter circuit, a signal amplification circuit, a rectifier circuit and a comparison circuit in one embodiment. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Safety helmets are used to provide safety protection for workers in power grid operations. Workers do not need the electric field warning function of the safety helmets on the way to the work destination. In order to extend the battery life of the safety helmets and effectively utilize the battery power of the safety helmets, the safety helmets are in shutdown mode during this process. Existing safety helmet products use mechanical buttons, which are generally installed inside the shielding body of the safety helmet. This setting makes the production process more difficult, reduces convenience and increases production costs. In order to solve the above technical problems, the present application provides a signal transmission circuit applied to safety helmets, referring to Figure 1 , including: a signal collector 10, a high-pass filter circuit 20, a signal amplifying circuit 30, a rectifier circuit 40 and a comparison circuit 50; wherein the signal collector 10 is connected to the high-pass filter circuit 20, for acquiring a biological sensing signal or an electric field signal, and transmitting the biological sensing signal or the electric field signal to the high-pass filter circuit 20; the high-pass filter circuit 20 is connected to the signal amplifying circuit 30, for filtering the biological sensing signal or the electric field signal, and transmitting it to the signal amplifying circuit 30; the signal amplifying circuit 30 is connected to the rectifier circuit 40, for amplifying the filtered biological sensing signal or the electric field signal, and transmitting it to the rectifier circuit 40 ; The rectifier circuit 40 is connected to the comparison circuit 50, and is used to rectify the amplified biological sensing signal or electric field signal and transmit it to the comparison circuit 50; the comparison circuit 50 is connected to the main control chip 60 of the helmet, and is used to compare the rectified biological sensing signal with a preset first reference voltage. If the voltage value corresponding to the biological sensing signal is greater than the first reference voltage, a high level signal is sent to the main control chip 60; or compare the rectified electric field signal with a preset second reference voltage. If the voltage value corresponding to the electric field signal is greater than the second reference voltage, a high level signal is sent to the main control chip 60.

[0037] Based on the above embodiments,

[0038] like Figure 2 As shown, the signal collector 10 includes: a first detection chip 1.1 and a second detection chip 1.2; wherein the output ends of the first detection chip 1.1 and the second detection chip 1.2 are both connected to the high-pass filter circuit 20.

[0039] like Figure 2 As shown, the high-pass filter circuit 20 includes: a first capacitor C108, a second capacitor C98, and a second resistor R98; wherein one end of the first capacitor C108 is connected to the first detection sheet 1.1, and the other end is connected to the signal amplification circuit 30, and the second capacitor C98 is connected to the second detection sheet 1.2, and the other end is connected to the signal amplification circuit 30. One end of the second resistor R98 is connected to an end of the second capacitor C98 away from the second detection sheet 1.2, and the other end of the second resistor R98 is grounded.

[0040] like Figure 2 As shown, the signal amplification circuit 30 includes: a third capacitor E18, a first operational amplifier U38A, a fourth resistor R108 and a fifth resistor R118; wherein the non-inverting input terminal of the first operational amplifier U38A is connected to the end of the second capacitor C98 away from the second detection sheet 1.2; the inverting input terminal of the first operational amplifier U38A is grounded; the positive terminal of the first operational amplifier U38A is connected to one end of the third capacitor E18 and an external power supply; the other end of the third capacitor E18 is grounded. One end of the fourth resistor R108 is connected to the inverting input terminal of the first operational amplifier U38A, and the other end is grounded; one end of the fifth resistor R118 is connected to the inverting input terminal of the first operational amplifier U38A, and the other end is connected to the output terminal of the first operational amplifier U38A.

[0041] like Figure 2 As shown, the rectifier circuit 40 includes: a diode D18, a fourth capacitor E28 and a first resistor R128; wherein, the anode of the diode D18 is connected to the output end of the first operational amplifier U38A, the cathode of the diode D18 is connected to one end of the first resistor R128 and the comparison circuit 50, and the other end of the first resistor R128 is grounded; the fourth capacitor E28 is connected in parallel with the first resistor R128.

[0042] like Figure 2As shown, the comparison circuit 50 includes: a fifth capacitor C88, a second operational amplifier U38B, a sixth resistor R148 and a seventh resistor R138; wherein the inverting input terminal of the second operational amplifier U38B is connected to the cathode of the diode D18, and the non-inverting input terminal of the second operational amplifier U38B is connected to the external power supply; the output terminal of the second operational amplifier U38B is connected to one end of the fifth capacitor C88 and the main control chip 60, and the other end of the fifth capacitor C88 is grounded. One end of the sixth resistor R148 is connected to the non-inverting input terminal of the second operational amplifier U38B, and the other end is connected to the external power supply; one end of the seventh resistor R138 is connected to the non-inverting input terminal of the second operational amplifier U38B, and the other end is connected to the output terminal of the second operational amplifier U38B.

[0043] The present application also provides a safety helmet, comprising a helmet body and the signal transmission circuit applied to the safety helmet as described above, wherein the signal transmission circuit applied to the safety helmet is arranged on the helmet body.

[0044] Here’s how this application works:

[0045] When the safety helmet is in a strong electric field environment, the first detection piece 1.1 (metal detection plane) senses an electric field signal, which is filtered by capacitor C108 and then amplified by the first operational amplifier U38A. It is then rectified into a DC signal by diode D18, the fourth capacitor E28 and the first resistor R128 and sent to the second operational amplifier U38B. The second operational amplifier U38B (which is a reverse Schmitt trigger) compares the voltage value corresponding to the electric field signal with its internally preset second reference voltage. If the voltage value corresponding to the electric field signal is greater than the second reference voltage, a high-level signal is sent to the main control chip 60 to enable the main control chip 60 to control other circuits in the safety helmet to work.

[0046] When the operator touches the second detection piece 1.2 (metal detection plane) with his finger, the second detection piece 1.2 senses a biological sensing signal, which is filtered by the second capacitor C98 and then amplified by the first operational amplifier U38A. The signal is then rectified into a DC signal by the diode D18, the fourth capacitor E28 and the first resistor R128 and sent to the second operational amplifier U38B. The second operational amplifier U38B (which is a reverse Schmitt trigger) compares the voltage value corresponding to the electric field signal with a second reference voltage preset inside it. If the voltage value corresponding to the electric field signal is greater than the second reference voltage, a high-level signal is sent to the main control chip 60 to enable the main control chip 60 to control other circuits in the helmet to work.

[0047] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A signal transmission circuit applied to a helmet, characterized in that: include: A signal collector, connected to the high-pass filter circuit, for acquiring a biological sensing signal or an electric field signal, and transmitting the biological sensing signal or the electric field signal to the high-pass filter circuit; The high-pass filter circuit is connected to the signal amplification circuit, and is used to filter the biological sensing signal or the electric field signal and transmit it to the signal amplification circuit; The signal amplifying circuit is connected to the rectifying circuit, and is used to amplify the filtered biological sensing signal or electric field signal and transmit it to the rectifying circuit; The rectifier circuit is connected to the comparison circuit and is used to rectify the amplified biological sensing signal or electric field signal and transmit it to the comparison circuit; The comparison circuit is connected to the main control chip of the helmet, and is used to compare the rectified biosensing signal with a preset first reference voltage. If the voltage value corresponding to the biosensing signal is greater than the first reference voltage, a high level signal is sent to the main control chip; or compare the rectified electric field signal with a preset second reference voltage. If the voltage value corresponding to the electric field signal is greater than the second reference voltage, a high level signal is sent to the main control chip.

2. The signal transmission circuit for a helmet according to claim 1, characterized in that: The signal collector comprises: a first detection piece and a second detection piece; The output ends of the first detection chip and the second detection chip are both connected to the high-pass filter circuit.

3. The signal transmission circuit for a helmet according to claim 2, characterized in that: The high-pass filter circuit comprises: a first capacitor and a second capacitor; One end of the first capacitor is connected to the first detection sheet, and the other end is connected to the signal amplification circuit; one end of the second capacitor is connected to the second detection sheet, and the other end is connected to the signal amplification circuit.

4. The signal transmission circuit for a helmet according to claim 3, characterized in that: The signal amplification circuit comprises: a third capacitor and a first operational amplifier; The non-inverting input terminal of the first operational amplifier is connected to the end of the second capacitor away from the second detection sheet; the inverting input terminal of the first operational amplifier is grounded; the positive terminal of the first operational amplifier is connected to one end of the third capacitor and an external power supply; the other end of the third capacitor is grounded.

5. The signal transmission circuit for a helmet according to claim 4, characterized in that: The rectifier circuit comprises: a diode, a fourth capacitor and a first resistor; The anode of the diode is connected to the output end of the first operational amplifier, the cathode of the diode is connected to one end of the first resistor and the comparison circuit, and the other end of the first resistor is grounded; the fourth capacitor is connected in parallel with the first resistor.

6. The signal transmission circuit for a helmet according to claim 5, characterized in that: The comparison circuit comprises: a fifth capacitor and a second operational amplifier; The inverting input terminal of the second operational amplifier is connected to the cathode of the diode, and the non-inverting input terminal of the second operational amplifier is connected to the external power supply; the output terminal of the second operational amplifier is connected to one end of the fifth capacitor and the main control chip, and the other end of the fifth capacitor is grounded.

7. The signal transmission circuit for a helmet according to claim 3, characterized in that: The high-pass filter circuit further includes: a second resistor; One end of the second resistor is connected to an end of the second capacitor away from the second detection sheet, and the other end of the second resistor is grounded.

8. The signal transmission circuit for a helmet according to claim 4, characterized in that: The signal amplifying circuit further includes: a fourth resistor and a fifth resistor; One end of the fourth resistor is connected to the inverting input terminal of the first operational amplifier, and the other end is grounded; One end of the fifth resistor is connected to the inverting input terminal of the first operational amplifier, and the other end of the fifth resistor is connected to the output terminal of the first operational amplifier.

9. The signal transmission circuit for a helmet according to claim 6, characterized in that: The comparison circuit further includes: a sixth resistor and a seventh resistor; One end of the sixth resistor is connected to the non-inverting input terminal of the second operational amplifier, and the other end is connected to an external power supply; One end of the seventh resistor is connected to the non-inverting input terminal of the second operational amplifier, and the other end of the seventh resistor is connected to the output terminal of the second operational amplifier.

10. A safety helmet, characterized in that: It comprises a cap body and a signal transmission circuit applied to a safety helmet as described in any one of claims 1 to 9 above, wherein the signal transmission circuit applied to the safety helmet is arranged on the cap body.

Images