CN211239843U - Signal conversion security protection control circuit - Google Patents
Signal conversion security protection control circuit Download PDFInfo
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- CN211239843U CN211239843U CN202020073646.3U CN202020073646U CN211239843U CN 211239843 U CN211239843 U CN 211239843U CN 202020073646 U CN202020073646 U CN 202020073646U CN 211239843 U CN211239843 U CN 211239843U
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Abstract
The utility model discloses a signal conversion security protection control circuit, include: the device comprises a signal input module, a safety protection module, an impedance module, a modulation module and a signal output module, wherein a triode Q1 in the signal input module is used for controlling the on-off of a signal by a non-contact switch, and a receiver U1 is used for amplifying a received signal; an operational amplifier U2 in the safety protection module carries out safety protection on a passing signal and converts a conduction path of the signal through a transistor Q2 and a transistor Q3; a triode Q4 in the impedance module carries out impedance filtering on interference signals generated in the received signals; a signal amplifier U3 in the modulation module receives a signal transmitted after impedance; modulating the signal by an adjustable resistor RV2 and an inductance coil L2 to be suitable for a propagated signal; the capacitor C7 and the capacitor C6 in the signal output module provide stored charges for the operational amplifier U4, so that the modulated signal transmission is stable, and the safety and the protection of signal conversion are improved.
Description
Technical Field
The utility model belongs to the technical field of a security protection technique and specifically relates to a signal conversion security protection control circuit.
Background
The security protection is to take the security of a maintenance system as a guarantee, and prepare for detection when equipment works so as to perform prevention and protection when danger occurs or faults occur; the damage of components is avoided, so that the protected object is not in danger.
Interference sources generated in signal conversion in the existing signal conversion security control circuit cannot be filtered; the circuit with the fault can not be switched quickly, so that the safety of the equipment can not be protected; the stability of data transmission cannot be maintained when the signal is output.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model provides a signal conversion security protection control circuit to solve the above-mentioned problem that prior art exists.
The technical scheme is as follows: a signal conversion security protection control circuit comprises: the device comprises a signal input module, a safety protection module, an impedance module, a modulation module and a signal output module, wherein a triode Q1 in the signal input module is used for controlling the on-off of a signal by a non-contact switch, and a receiver U1 is used for amplifying a received signal; an operational amplifier U2 in the safety protection module carries out safety protection on a passing signal and converts a conduction path of the signal through a transistor Q2 and a transistor Q3; a triode Q4 in the impedance module carries out impedance filtering on interference signals generated in the received signals; a signal amplifier U3 in the modulation module receives a signal transmitted after impedance; modulating the signal by an adjustable resistor RV2 and an inductance coil L2 to be suitable for a propagated signal; the capacitor C7 and the capacitor C6 in the signal output module provide stored charges for the operational amplifier U4 so that the modulated signal transmission is stable.
In a further embodiment, the signal input module includes an interface JP1, a resistor R1, a resistor R2, a transistor Q1, a resistor R4, a lamp LED1, a receiver U1, a resistor R3, and a capacitor C1, where pin 1 of the interface JP1 is respectively connected to one end of the resistor R1, a collector of the transistor Q1, and a cathode of the lamp LED 1; the interface JP1 pin 2 is connected with one end of a resistor R2 and one end of a resistor R4; the other end of the resistor R1 is respectively connected with the base electrode end of the triode Q1 and the other end of the resistor R2; the emitter terminal of the triode Q1 is respectively connected with one end of a resistor R3, the other end of the resistor R4 and a ground wire GND; the other end of the resistor R3 is connected with a pin 2 of a receiver U1; the positive terminal of the lamp LED1 is connected with a pin 3 of a U1 receiver; the pin 4 of the receiver U1 is connected with one end of a capacitor C1; the other end of the capacitor C1 is connected with a ground wire GND; and pin 7 of the receiver U1 is connected with a +5V power supply.
In a further embodiment, the safety protection module comprises a capacitor C2, a resistor R5, a signal operator U2, a resistor R6, an inductor L1, a capacitor C3, an adjustable resistor RV1, a diode D1, a transistor Q2, a resistor R9, and a transistor Q3, wherein the positive terminal of the capacitor C2 is connected with one terminal of the resistor R5, a pin 7 of a receiver U1, and a power supply +5V, respectively; the negative end of the capacitor C2 is respectively connected with a pin 3 of a signal arithmetic unit U2 at the other end of the resistor R5 and a pin 6 of a receiver U1; the pin 2 of the signal arithmetic unit U2 is connected with one end of a resistor R6; the other end of the resistor R6 is respectively connected with one end of a resistor R9 and a pin 6 of a signal arithmetic unit U2; the pin 7 of the signal arithmetic unit U2 is respectively connected with one end of an inductor L1, a pin 1 of an adjustable resistor RV1, a pin 3 of a transistor Q2, a pin 1 of an interface JP1, one end of a resistor R1, a collector end of a triode Q1 and a cathode end of a lamp LED 1; the other end of the inductor L1 is connected with the positive end of a capacitor C3; the negative end of the capacitor C3 is respectively connected with the positive end of the diode D1, the pin 2 of the transistor Q3 and the ground wire GND; and the cathode end of the diode D1 is respectively connected with a pin 2 of an adjustable resistor RV1 and a pin 1 of a transistor Q3.
In a further embodiment, the impedance module includes a resistor R8, a transistor Q4, a transistor Q6, and a thermistor VR1, wherein one end of the resistor R8 is connected to a collector terminal of a transistor Q4, pins 1 and 2 of a transistor Q6, and pin 1 of a transistor Q2, respectively; the other end of the resistor R8 is connected with a pin 3 of a transistor Q3; the base end of the triode Q4 is connected with the other end of the resistor R9; the emitter terminal of the triode Q4 is respectively connected with one end of a thermistor VR1, the cathode terminal of a capacitor C3, the anode terminal of a diode D1, a pin 2 of a transistor Q3 and a ground wire GND; and the pin 4 of the transistor Q6 is connected with the other end of the thermistor VR 1.
In a further embodiment, the modulation module includes a transistor Q4, a capacitor C4, a diode D2, a diode D3, a transistor Q3, an inductor L2, an adjustable resistor RV2, a resistor R10, a signal amplifier U3, an inductor L3, an inductor L4, a diode D4, a resistor R11, and a capacitor C5, where pin 1 of the transistor Q4 is connected to pin 3 of the transistor Q6; the pin 3 of the transistor Q4 is connected with the positive end of a capacitor C4; pin 2 of the transistor Q4 is connected with one end of an inductance coil L2; the other end of the inductance coil L2 is connected with a pin 1 of a transistor Q5; the negative end of the capacitor C4 is respectively connected with the positive end of the diode D2 and the ground wire GND; the negative end of the diode D2 is connected with pin 2 of an adjustable resistor RV 2; the pin 2 of the transistor Q5 is respectively connected with 1 of one end of an inductance coil L3, a pin 3 of a signal amplifier U3 and one end of a resistor R10; pin 2 of the transistor Q5 is connected with the negative terminal of a diode D3; the positive end of the diode D3 is respectively connected with the other end of the resistor R10 and one end of the inductor L4; pin 3 and pin 1 of the adjustable resistor RV2 are connected with pin 2 of a signal amplifier U3; the other end of the inductor L4 is respectively connected with the other end of the inductor L3, a pin 6 of a signal amplifier U3, one end of a resistor R11 and the negative electrode end of a diode D4; the positive end of the diode D4 is connected with one end of a capacitor C5.
In a further embodiment, the signal output module comprises an operational amplifier U4, a resistor R12, a resistor R7, a capacitor C6, a resistor R13, a capacitor C7, a resistor R14, a signal amplifier U5 and a port JP2, wherein a pin 6 of the operational amplifier U4 is connected with the other end of the resistor R11; the pin 4 of the operational amplifier U4 is connected with one end of a resistor R12; the other end of the resistor R12 is connected with the other end of the capacitor C5; the pin 7 of the operational amplifier U4 is respectively connected with a pin 4 of a signal amplifier U5, a pin 4 of a signal amplifier U3 and a power supply + 5V; the pin 3 of the operational amplifier U4 is respectively connected with one end of a resistor R14 and a ground wire GND; pin 2 of the operational amplifier U4 is connected with one end of a resistor R7; the other end of the resistor R7 is respectively connected with one end of a resistor R13 and one end of a capacitor C6; the other end of the capacitor C6 is respectively connected with one end of a capacitor C7 and a ground wire GND; the other end of the resistor R13 is respectively connected with the positive end of the capacitor C7 and a pin 3 of the signal amplifier U5; the other end of the resistor R14 is connected with a pin 2 of a signal amplifier U5; pin 6 of the signal amplifier U5 is connected with pin 1 of a port JP 2; and the terminal JP2 pin 2 is respectively connected with the other end of an inductor L4, the other end of an inductor L3, a pin 6 of a signal amplifier U3, one end of a resistor R11 and the negative electrode of a diode D4.
In a further embodiment, the transistor Q1 and the transistor Q4 are NPN transistors; the capacitor C2, the capacitor C3, the capacitor C4 and the capacitor C7 are all voltage-stabilizing diodes; the diode D1 and the diode D4 are voltage-stabilizing diodes.
Has the advantages that: the utility model carries out impedance filtration to the interference signal generated in the received signal by the triode Q4 in the impedance module, and the transistor Q6 transmits the filtered safe and effective data, thereby the thermistor VR1 detects the path of signal transmission and protects the safety of the work of components; the capacitor C2 in the safety protection module provides stored charge for the operational amplifier U2 to improve the quality of safety protection, and the conduction path is rapidly switched for signal conversion safety protection through the transistor Q2 and the transistor Q3; the capacitor C7 and the capacitor C6 in the signal output module provide stored charges for the operational amplifier U4 to enable the modulated signal to be transmitted, and stability of damaged signal output is maintained.
Drawings
Fig. 1 is a circuit diagram of the module of the present invention.
Fig. 2 is a circuit diagram of the signal input module of the present invention.
Fig. 3 is a circuit diagram of the safety protection module of the present invention.
Fig. 4 is a circuit diagram of the impedance module of the present invention.
Fig. 5 is a circuit diagram of the modulation module of the present invention.
Fig. 6 is a circuit diagram of the signal output module of the present invention.
Detailed Description
Referring to fig. 1 to 6, a signal conversion security control circuit includes: the signal input module comprises an interface JP1, a resistor R1, a resistor R2, a triode Q1, a resistor R4, a lamp LED1, a receiver U1, a resistor R3 and a capacitor C1.
The safety protection module comprises a capacitor C2, a resistor R5, a signal operator U2, a resistor R6, an inductor L1, a capacitor C3, an adjustable resistor RV1, a diode D1, a transistor Q2, a resistor R9 and a transistor Q3.
The impedance module comprises a resistor R8, a triode Q4, a transistor Q6 and a thermistor VR 1.
The modulation module comprises a transistor Q4, a capacitor C4, a diode D2, a diode D3, a transistor Q3, an inductance coil L2, an adjustable resistor RV2, a resistor R10, a signal amplifier U3, an inductance coil L3, an inductance L4, a diode D4, a resistor R11 and a capacitor C5.
The signal output module comprises an operational amplifier U4, a resistor R12, a resistor R7, a capacitor C6, a resistor R13, a capacitor C7, a resistor R14, a signal amplifier U5 and a port JP 2.
The interface JP1 pin 1 in the signal input module is respectively connected with one end of a resistor R1, a collector end of a triode Q1 and a cathode end of a lamp LED 1; the interface JP1 pin 2 is connected with one end of a resistor R2 and one end of a resistor R4; the other end of the resistor R1 is respectively connected with the base electrode end of the triode Q1 and the other end of the resistor R2; the emitter terminal of the triode Q1 is respectively connected with one end of a resistor R3, the other end of the resistor R4 and a ground wire GND; the other end of the resistor R3 is connected with a pin 2 of a receiver U1; the positive terminal of the lamp LED1 is connected with a pin 3 of a U1 receiver; the pin 4 of the receiver U1 is connected with one end of a capacitor C1; the other end of the capacitor C1 is connected with a ground wire GND; and pin 7 of the receiver U1 is connected with a +5V power supply.
The positive end of the capacitor C2 in the safety protection module is respectively connected with one end of a resistor R5, a pin 7 of a receiver U1 and a power supply + 5V; the negative end of the capacitor C2 is respectively connected with a pin 3 of a signal arithmetic unit U2 at the other end of the resistor R5 and a pin 6 of a receiver U1; the pin 2 of the signal arithmetic unit U2 is connected with one end of a resistor R6; the other end of the resistor R6 is respectively connected with one end of a resistor R9 and a pin 6 of a signal arithmetic unit U2; the pin 7 of the signal arithmetic unit U2 is respectively connected with one end of an inductor L1, a pin 1 of an adjustable resistor RV1, a pin 3 of a transistor Q2, a pin 1 of an interface JP1, one end of a resistor R1, a collector end of a triode Q1 and a cathode end of a lamp LED 1; the other end of the inductor L1 is connected with the positive end of a capacitor C3; the negative end of the capacitor C3 is respectively connected with the positive end of the diode D1, the pin 2 of the transistor Q3 and the ground wire GND; and the cathode end of the diode D1 is respectively connected with a pin 2 of an adjustable resistor RV1 and a pin 1 of a transistor Q3.
One end of the resistor R8 in the impedance module is respectively connected with a collector terminal of a triode Q4, a pin 1 and a pin 2 of a transistor Q6 and a pin 1 of a transistor Q2; the other end of the resistor R8 is connected with a pin 3 of a transistor Q3; the base end of the triode Q4 is connected with the other end of the resistor R9; the emitter terminal of the triode Q4 is respectively connected with one end of a thermistor VR1, the cathode terminal of a capacitor C3, the anode terminal of a diode D1, a pin 2 of a transistor Q3 and a ground wire GND; and the pin 4 of the transistor Q6 is connected with the other end of the thermistor VR 1.
The pin 1 of the transistor Q4 in the modulation module is connected with the pin 3 of a transistor Q6; the pin 3 of the transistor Q4 is connected with the positive end of a capacitor C4; pin 2 of the transistor Q4 is connected with one end of an inductance coil L2; the other end of the inductance coil L2 is connected with a pin 1 of a transistor Q5; the negative end of the capacitor C4 is respectively connected with the positive end of the diode D2 and the ground wire GND; the negative end of the diode D2 is connected with pin 2 of an adjustable resistor RV 2; the pin 2 of the transistor Q5 is respectively connected with 1 of one end of an inductance coil L3, a pin 3 of a signal amplifier U3 and one end of a resistor R10; pin 2 of the transistor Q5 is connected with the negative terminal of a diode D3; the positive end of the diode D3 is respectively connected with the other end of the resistor R10 and one end of the inductor L4; pin 3 and pin 1 of the adjustable resistor RV2 are connected with pin 2 of a signal amplifier U3; the other end of the inductor L4 is respectively connected with the other end of the inductor L3, a pin 6 of a signal amplifier U3, one end of a resistor R11 and the negative electrode end of a diode D4; the positive end of the diode D4 is connected with one end of a capacitor C5.
The pin 6 of the operational amplifier U4 in the signal output module is connected with the other end of the resistor R11; the pin 4 of the operational amplifier U4 is connected with one end of a resistor R12; the other end of the resistor R12 is connected with the other end of the capacitor C5; the pin 7 of the operational amplifier U4 is respectively connected with a pin 4 of a signal amplifier U5, a pin 4 of a signal amplifier U3 and a power supply + 5V; the pin 3 of the operational amplifier U4 is respectively connected with one end of a resistor R14 and a ground wire GND; pin 2 of the operational amplifier U4 is connected with one end of a resistor R7; the other end of the resistor R7 is respectively connected with one end of a resistor R13 and one end of a capacitor C6; the other end of the capacitor C6 is respectively connected with one end of a capacitor C7 and a ground wire GND; the other end of the resistor R13 is respectively connected with the positive end of the capacitor C7 and a pin 3 of the signal amplifier U5; the other end of the resistor R14 is connected with a pin 2 of a signal amplifier U5; pin 6 of the signal amplifier U5 is connected with pin 1 of a port JP 2; and the terminal JP2 pin 2 is respectively connected with the other end of an inductor L4, the other end of an inductor L3, a pin 6 of a signal amplifier U3, one end of a resistor R11 and the negative electrode of a diode D4.
The working principle is as follows: the signal transmission interface is inserted into a port JP1, a resistor R1 and a resistor R2 limit the current, so that the signal is prevented from flowing fast and being leaked, a triode Q1 is used for controlling the on-off of signal transmission through a non-contact switch, a lamp LED1 displays whether power voltage exists in the path, and a receiver U1 is electrified to receive signals and amplify and convert the signals; the capacitor C2 and the resistor R5 provide stored charges for the operational amplifier U2 to improve the quality of safety protection, the inductor L1 filters out specific waveband frequencies in signals, the diode D1 is connected and disconnected through a one-way conductive control circuit, and the transistor Q2 and the transistor Q3 quickly switch a conducting path for signal conversion safety protection; the triode Q4 carries out impedance filtration on interference signals generated in the received signals, and the thermistor VR1 detects heating components for signal transmission, so that the safety of the components is protected; the signal amplifier U3 receives the signal transmitted after impedance; modulating the signal by an adjustable resistor RV2 and an inductance coil L2 to be suitable for a propagated signal; the capacitor C7 and the capacitor C6 provide stored charge to the operational amplifier U4 to stabilize modulated signal transmission, and the signal amplifier U5 improves output signal propagation quality and range.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the details of the above embodiments, and the technical concept of the present invention can be modified to perform various equivalent transformations, which all belong to the protection scope of the present invention.
Claims (5)
1. A signal conversion security protection control circuit is characterized by comprising: the device comprises a signal input module, a safety protection module, an impedance module, a modulation module and a signal output module, wherein a triode Q1 in the signal input module is used for controlling the on-off of a signal by a non-contact switch, and a receiver U1 is used for amplifying a received signal; an operational amplifier U2 in the safety protection module carries out safety protection on a passing signal and converts a conduction path of the signal through a transistor Q2 and a transistor Q3; a triode Q4 in the impedance module carries out impedance filtering on interference signals generated in the received signals; a signal amplifier U3 in the modulation module receives a signal transmitted after impedance; modulating the signal by an adjustable resistor RV2 and an inductance coil L2 to be suitable for a propagated signal; the capacitor C7 and the capacitor C6 in the signal output module provide stored charges for the operational amplifier U4 to stabilize the transmission of modulated signals; the signal input module comprises an interface JP1, a resistor R1, a resistor R2, a triode Q1, a resistor R4, a lamp LED1, a receiver U1, a resistor R3 and a capacitor C1, wherein a pin 1 of the interface JP1 is respectively connected with one end of the resistor R1, a collector end of the triode Q1 and a cathode end of the lamp LED 1; the interface JP1 pin 2 is connected with one end of a resistor R2 and one end of a resistor R4; the other end of the resistor R1 is respectively connected with the base electrode end of the triode Q1 and the other end of the resistor R2; the emitter terminal of the triode Q1 is respectively connected with one end of a resistor R3, the other end of the resistor R4 and a ground wire GND; the other end of the resistor R3 is connected with a pin 2 of a receiver U1; the positive terminal of the lamp LED1 is connected with a pin 3 of a U1 receiver; the pin 4 of the receiver U1 is connected with one end of a capacitor C1; the other end of the capacitor C1 is connected with a ground wire GND; and pin 7 of the receiver U1 is connected with a +5V power supply.
2. The signal conversion security control circuit of claim 1, wherein: the safety protection module comprises a capacitor C2, a resistor R5, a signal arithmetic unit U2, a resistor R6, an inductor L1, a capacitor C3, an adjustable resistor RV1, a diode D1, a transistor Q2, a resistor R9 and a transistor Q3, wherein the positive end of the capacitor C2 is respectively connected with one end of the resistor R5, a pin 7 of a receiver U1 and a power supply + 5V; the negative end of the capacitor C2 is respectively connected with a pin 3 of a signal arithmetic unit U2 at the other end of the resistor R5 and a pin 6 of a receiver U1; the pin 2 of the signal arithmetic unit U2 is connected with one end of a resistor R6; the other end of the resistor R6 is respectively connected with one end of a resistor R9 and a pin 6 of a signal arithmetic unit U2; the pin 7 of the signal arithmetic unit U2 is respectively connected with one end of an inductor L1, a pin 1 of an adjustable resistor RV1, a pin 3 of a transistor Q2, a pin 1 of an interface JP1, one end of a resistor R1, a collector end of a triode Q1 and a cathode end of a lamp LED 1; the other end of the inductor L1 is connected with the positive end of a capacitor C3; the negative end of the capacitor C3 is respectively connected with the positive end of the diode D1, the pin 2 of the transistor Q3 and the ground wire GND; and the cathode end of the diode D1 is respectively connected with a pin 2 of an adjustable resistor RV1 and a pin 1 of a transistor Q3.
3. The signal conversion security control circuit of claim 1, wherein: the impedance module comprises a resistor R8, a triode Q4, a transistor Q6 and a thermistor VR1, wherein one end of the resistor R8 is respectively connected with a collector terminal of a triode Q4, pins 1 and 2 of a transistor Q6 and pin 1 of a transistor Q2; the other end of the resistor R8 is connected with a pin 3 of a transistor Q3; the base end of the triode Q4 is connected with the other end of the resistor R9; the emitter terminal of the triode Q4 is respectively connected with one end of a thermistor VR1, the cathode terminal of a capacitor C3, the anode terminal of a diode D1, a pin 2 of a transistor Q3 and a ground wire GND; and the pin 4 of the transistor Q6 is connected with the other end of the thermistor VR 1.
4. The signal conversion security control circuit of claim 1, wherein: the modulation module comprises a transistor Q4, a capacitor C4, a diode D2, a diode D3, a transistor Q3, an inductance coil L2, an adjustable resistor RV2, a resistor R10, a signal amplifier U3, an inductance coil L3, an inductance L4, a diode D4, a resistor R11 and a capacitor C5, wherein a pin 1 of the transistor Q4 is connected with a pin 3 of a transistor Q6; the pin 3 of the transistor Q4 is connected with the positive end of a capacitor C4; pin 2 of the transistor Q4 is connected with one end of an inductance coil L2; the other end of the inductance coil L2 is connected with a pin 1 of a transistor Q5; the negative end of the capacitor C4 is respectively connected with the positive end of the diode D2 and the ground wire GND; the negative end of the diode D2 is connected with pin 2 of an adjustable resistor RV 2; the pin 2 of the transistor Q5 is respectively connected with 1 of one end of an inductance coil L3, a pin 3 of a signal amplifier U3 and one end of a resistor R10; pin 2 of the transistor Q5 is connected with the negative terminal of a diode D3; the positive end of the diode D3 is respectively connected with the other end of the resistor R10 and one end of the inductor L4; pin 3 and pin 1 of the adjustable resistor RV2 are connected with pin 2 of a signal amplifier U3; the other end of the inductor L4 is respectively connected with the other end of the inductor L3, a pin 6 of a signal amplifier U3, one end of a resistor R11 and the negative electrode end of a diode D4; the positive end of the diode D4 is connected with one end of a capacitor C5.
5. The signal conversion security control circuit of claim 1, wherein: the signal output module comprises an operational amplifier U4, a resistor R12, a resistor R7, a capacitor C6, a resistor R13, a capacitor C7, a resistor R14, a signal amplifier U5 and a port JP2, wherein the pin 6 of the operational amplifier U4 is connected with the other end of the resistor R11; the pin 4 of the operational amplifier U4 is connected with one end of a resistor R12; the other end of the resistor R12 is connected with the other end of the capacitor C5; the pin 7 of the operational amplifier U4 is respectively connected with a pin 4 of a signal amplifier U5, a pin 4 of a signal amplifier U3 and a power supply + 5V; the pin 3 of the operational amplifier U4 is respectively connected with one end of a resistor R14 and a ground wire GND; pin 2 of the operational amplifier U4 is connected with one end of a resistor R7; the other end of the resistor R7 is respectively connected with one end of a resistor R13 and one end of a capacitor C6; the other end of the capacitor C6 is respectively connected with one end of a capacitor C7 and a ground wire GND; the other end of the resistor R13 is respectively connected with the positive end of the capacitor C7 and a pin 3 of the signal amplifier U5; the other end of the resistor R14 is connected with a pin 2 of a signal amplifier U5; pin 6 of the signal amplifier U5 is connected with pin 1 of a port JP 2; and the terminal JP2 pin 2 is respectively connected with the other end of an inductor L4, the other end of an inductor L3, a pin 6 of a signal amplifier U3, one end of a resistor R11 and the negative electrode of a diode D4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020073646.3U CN211239843U (en) | 2020-01-14 | 2020-01-14 | Signal conversion security protection control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020073646.3U CN211239843U (en) | 2020-01-14 | 2020-01-14 | Signal conversion security protection control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN211239843U true CN211239843U (en) | 2020-08-11 |
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| CN202020073646.3U Active CN211239843U (en) | 2020-01-14 | 2020-01-14 | Signal conversion security protection control circuit |
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| CN (1) | CN211239843U (en) |
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