Power-on maloperation prevention circuit of underwater intelligent detection equipment

Abstract

The embodiment of the invention discloses a power-on maloperation prevention circuit for underwater intelligent detection equipment. The power-on maloperation prevention circuit comprises a first reset chip, a second reset chip, an analog switch, a microcontroller and an interface chip, a reset signal output end of the first reset chip is respectively connected with a reset port of the microcontroller and a manual reset port of the second reset chip; the reset signal output end of the second reset chip is connected with the control end of the analog switch; the common end of the analog switch is connected with the enabling control end of the interface chip through a resistor, the normally open end of the analog switch is connected with a ground wire, and the normally closed end of the analog switch is connected with a power supply; the signal output end of the microcontroller is connected with the signal input end of the interface chip. The stable output of the microprocessor is ensured, so that the power-on stability is improved, and the error output condition caused by power-on jitter is avoided.

Description

Technical Field

[0001] The invention relates to the field of circuit safety, and in particular to a power-on malfunction prevention circuit for underwater intelligent detection equipment. Background Art

[0002] Intelligent underwater detection equipment that drives pyrotechnics generally has a microprocessor. During the power-on reset period, the output pins of the microprocessor are in an unstable state because the internal software is not loaded and running. If the subsequent action mechanism is directly controlled, it will cause control error output, which may cause serious accidents in severe cases.

[0003] There is no effective solution to the problem of unreliable control output of power-on reset device of intelligent detection equipment in the prior art. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a power-on anti-false operation circuit for underwater detection equipment, which controls the opening and closing of the analog switch through the pulse output of the first reset chip and the second reset chip after power-on, so that the stable control output of the microprocessor is connected to the output end of the interface chip, thereby achieving the purpose of stable output on power-on, so as to solve the problem of unreliable control output of the power-on reset device of the intelligent detection equipment in the prior art.

[0005] To achieve the above-mentioned purpose, the present invention provides a power-on anti-misoperation circuit for underwater detection equipment, comprising: a first reset chip, a second reset chip, an analog switch, a microcontroller and an interface chip; the reset signal output end of the first reset chip is respectively connected to the reset port of the microcontroller and the manual reset port of the second reset chip; the reset signal output end of the second reset chip is connected to the control end of the analog switch; the common end of the analog switch is connected to the enable control end of the interface chip through a resistor, the normally open end is connected to the ground wire, and the normally closed end is connected to the power supply; the signal output end of the microcontroller is connected to the signal input end of the interface chip.

[0006] Further optionally, the analog switch has a built-in single-pole double-throw switch.

[0007] Further optionally, the microcontroller includes a first signal output terminal and a second signal output terminal; the interface chip includes a first signal input terminal and a second signal input terminal; the first signal output terminal is connected to the first signal input terminal; and the second signal output terminal is connected to the second signal input terminal.

[0008] Further optionally, the interface chip includes a third signal output terminal and a fourth signal output terminal; the third signal output terminal is connected to the first output branch, and the third signal output terminal is grounded through a resistor; the fourth signal output terminal leads to the second output branch, and the fourth signal output terminal is grounded through a resistor.

[0009] The above technical solution has the following beneficial effects: through the cooperation of the first reset chip, the second reset chip and the analog switch, the stable output of the microprocessor is guaranteed, thereby improving the power-on stability and avoiding the erroneous output caused by power-on jitter. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] 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.

[0011] Figure 1 It is a structural schematic diagram of a power-on anti-misoperation circuit for underwater intelligent detection equipment provided by an embodiment of the present invention.

[0012] Figure numerals: 1 - first reset chip; 2 - second reset chip; 3 - analog switch; 4 - microcontroller; 5 - interface chip. DETAILED DESCRIPTION

[0013] 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.

[0014] In order to solve the problem of unreliable control output of power-on reset device of intelligent detection equipment in the prior art, an embodiment of the present invention provides a power-on anti-misoperation circuit for underwater intelligent detection equipment. Figure 1 Schematic diagram of the structure of the power-on anti-malfunction circuit of the underwater intelligent detection device provided by the embodiment of the present invention. Figure 1 As shown, the circuit includes: a first reset chip 1, a second reset chip 2, an analog switch 3, a microcontroller 4 and an interface chip 5; the reset signal output end of the first reset chip 1 is respectively connected to the reset port of the microcontroller 4 and the manual reset port of the second reset chip 2; the reset signal output end of the second reset chip 2 is connected to the control end of the analog switch 3; the common end of the analog switch 3 is connected to the enable control end of the interface chip 5 through a resistor, the normally open end is connected to the ground wire, and the normally closed end is connected to the power supply; the signal output end of the microcontroller 4 is connected to the signal input end of the interface chip 5.

[0015] like Figure 1As shown, the reset signal output end of the first reset chip 1 is divided into two branches, which are respectively connected to the reset port of the microcontroller 4 and the manual reset port of the second reset chip 2 to generate a reset signal of the microprocessor to complete the reset of the microprocessor.

[0016] The reset signal output terminal of the second reset chip 2 is connected to the control terminal of the analog switch 3, the common terminal of the analog switch 3 is connected to the enable terminal of the interface chip 5 through a resistor, the normally open contact of the analog switch 3 is connected to the ground wire, and the normally closed contact is connected to the power supply.

[0017] The first reset chip 1 , the second reset chip 2 , the microcontroller 4 and the interface chip 5 are all connected to the power source Vcc.

[0018] The signal output terminal of the microcontroller 4 is connected to the signal input terminal of the interface chip 5 .

[0019] When the system is powered on, the output end of the first reset chip 1 outputs a 200ms low-level pulse and then a high-level pulse. After the microprocessor is reset, the internal software operation is initialized to enter a stable low-level output state. The second reset chip 2 is in working state after powering on. It is connected in series with the reset signal output end of the first reset chip 1 through the manual reset port. The manual reset port outputs a 400ms low-level pulse and then a high level. After the analog switch 3 is powered on, the control end controls the internal switch common port to be connected to the normally closed contact (high level) first, and then to the normally open contact (low level). It outputs a high level for 400ms and then a low level. When the enable end of the control interface chip 5 is powered on, the enable end is at a high level, and the output of the interface chip 5 is in a three-state. During the three-state period, a controllable low level is stably output through a pull-down resistor. When the enable end becomes a low level, the interface chip 5 changes from a three-state to an output state, and the connection between the signal output end of the microprocessor and the signal input end of the interface chip 5 is connected, and the stably controlled output of the microprocessor is connected to the input end of the interface chip 5, thereby achieving the purpose of stable output after power-on, and further ensuring that the port driving the pyrotechnic product outputs a stable low level when powered on, eliminating the influence of the unstable port on the output during the reset of the processor, and preventing erroneous output caused by power-on jitter.

[0020] Preferably, the model of the interface chip 5 in this embodiment is 74HC245.

[0021] As an optional implementation, the analog switch 3 has a built-in single-pole double-throw switch.

[0022] The analog switch 3 has a built-in single-pole double-throw switch, whose control end is connected to the reset signal output port of the second reset chip 2, the common end is connected to the enable end of the interface chip 5 through a resistor, the normally open contact is connected to the ground wire, and the normally closed contact is connected to the power supply.

[0023] As an optional implementation, the microcontroller 4 includes a first signal output terminal and a second signal output terminal; the interface chip 5 includes a first signal input terminal and a second signal input terminal; the first signal output terminal is connected to the first signal input terminal; the second signal output terminal is connected to the second signal input terminal.

[0024] The microcontroller 4 includes two signal output terminals, namely, a first signal output terminal and a second signal output terminal, and the interface chip 5 includes two signal input terminals, namely, a first signal input terminal and a second signal input terminal, and the two signal input terminals of the interface chip 5 are respectively connected to the two signal output terminals of the microcontroller 4. Different signals can be output through different output ports. Of course, the number of signal output terminals and signal input terminals can be arbitrarily set according to requirements.

[0025] As an optional implementation, the interface chip 5 includes a third signal output terminal and a fourth signal output terminal; the third signal output terminal is connected to the first output branch, and the third signal output terminal is grounded through a resistor; the fourth signal output terminal leads to the second output branch, and the fourth signal output terminal is grounded through a resistor.

[0026] like Figure 1 As shown, the interface chip 5 also includes two signal output terminals, namely, a third signal output terminal and a fourth signal output terminal. A first output branch is led out from the third signal output terminal, and the third signal output terminal is simultaneously connected to the ground wire through a resistor; a second output branch is led out from the fourth signal output terminal, and the fourth signal output terminal is simultaneously connected to the ground wire through a resistor, so as to ensure that the interface chip 5 can output multiple signals. Of course, the number of signal output terminals of the interface chip 5 can be arbitrarily set according to requirements.

[0027] The above technical solution has the following beneficial effects: through the cooperation of the first reset chip, the second reset chip and the analog switch, the stable output of the microprocessor is guaranteed, thereby improving the power-on stability and avoiding the erroneous output caused by power-on jitter.

[0028] The specific implementation methods of the above invention further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above content is only the specific implementation methods of the present invention and is not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A circuit for preventing malfunction when powering on an underwater intelligent detection device, characterized in that: include: A first reset chip, a second reset chip, an analog switch, a microcontroller and an interface chip; The reset signal output end of the first reset chip is respectively connected to the reset port of the microcontroller and the manual reset port of the second reset chip; A reset signal output terminal of the second reset chip is connected to a control terminal of the analog switch; The common end of the analog switch is connected to the enable control end of the interface chip through a resistor, the normally open end is connected to the ground wire, and the normally closed end is connected to the power supply; The signal output terminal of the microcontroller is connected to the signal input terminal of the interface chip.

2. The circuit for preventing malfunction of underwater intelligent detection equipment when powered on according to claim 1 is characterized in that: The analog switch has a built-in single-pole double-throw switch.

3. The circuit for preventing malfunction of underwater intelligent detection equipment when powered on according to claim 1 is characterized in that: The microcontroller comprises a first signal output terminal and a second signal output terminal; The interface chip includes a first signal input terminal and a second signal input terminal; The first signal output terminal is connected to the first signal input terminal; The second signal output terminal is connected to the second signal input terminal.

4. The circuit for preventing malfunction of underwater intelligent detection equipment when powered on according to claim 3 is characterized in that: The interface chip includes a third signal output terminal and a fourth signal output terminal; The third signal output terminal is connected to the first output branch, and the third signal output terminal is grounded through a resistor; The fourth signal output terminal leads to a second output branch, and the fourth signal output terminal is grounded through a resistor.

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