Anti-latent-pass circuit based on analog switch

Abstract

The utility model relates to an anti-latent-pass circuit based on an analog switch. The anti-latent-pass circuit comprises an integrating circuit, a logic control circuit, a switching circuit and a reference source circuit, the input end of the integrating circuit is used for current input, the output end of the integrating circuit is electrically connected with the logic control circuit, and the integrating circuit carries out sampling and voltage division on the input current and then carries out integration on the input current; the reference source circuit is electrically connected with the integrating circuit through the switching circuit, and the reference source circuit provides a standard current source; the logic control circuit is electrically connected with the switching circuit, and the switching circuit receives a signal of the logic control circuit to control connection or disconnection between the reference source circuit and the integrating circuit; the power supply part of the analog switch adopts diode partition (by utilizing the unilateral conductivity of a diode), so that the unilateral flow of current is realized, the problem of latent flux is solved, and possible disastrous accidents are effectively prevented; and the potential path problem is solved with extremely low cost.

Description

Technical Field

[0001] This application relates to the field of analog circuit technology, specifically to an anti-submarine circuit based on an analog switch. Background Technology

[0002] Analog switches are widely used due to their low power consumption, high speed, lack of mechanical contacts, small size, long lifespan, and rail-to-rail dynamic range and bidirectional operation. Applications include automatic control systems, digital electronic products, audio processing, video signal switching, and sensor interfaces. They are primarily used to switch signal links between connected and disconnected states. Furthermore, analog switches require attention to performance parameters such as signal-to-noise ratio (SNR), linearity, channel isolation, and bandwidth, maintaining signal integrity and avoiding the introduction of additional noise and distortion. This makes analog switches perform exceptionally well when processing continuously changing analog signals, such as audio, video, and sensor signals. However, in most applications, analog switches require digital control to achieve connection state switching. Because the power supply timing and signal return in mixed-signal circuits are complex, even slight errors can lead to potential circuit breaks.

[0003] In electrical and electronic systems, there exists a special phenomenon that can trigger unintended functions or inhibit desired functions, known as a latent path. This phenomenon does not originate from hardware failure, but rather from potential states that may be unintentionally embedded during the design process. These potential circuit states can pose a serious threat to system equipment and even personal safety. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the main objective of this utility model is to provide an anti-submarine circuit based on an analog switch.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an anti-submarine circuit based on an analog switch, comprising an integrating circuit, a logic control circuit, a switching circuit, and a reference source circuit.

[0006] The input terminal of the integrator circuit is used for current input, and the output terminal of the integrator circuit is electrically connected to the logic control circuit. The integrator circuit samples and divides the input current, and then integrates the input current.

[0007] The reference source circuit is electrically connected to the integrator circuit via a switching circuit, and the reference source circuit provides a standard current source.

[0008] The logic control circuit is electrically connected to the switching circuit. The switching circuit receives a signal from the logic control circuit to control the connection or disconnection between the reference source circuit and the integrator circuit.

[0009] Preferably, the switching circuit includes an analog switch circuit, wherein two diodes are arranged in parallel between the A_VDD terminal of the analog switch circuit and the VDD terminal of the reference source circuit, and the input terminal of the diodes is connected to the VDD terminal of the reference source circuit.

[0010] Preferably, the integrating circuit includes an integrating processor U2 and a capacitor C1 connected in parallel with the integrating processor U2. The V+ and V- pins of the integrating processor U2 are connected to the positive and negative terminals of the power supply and the reference power supply, respectively. The current input to the integrating circuit is connected to the IIN+ and IIN+ pins of the integrating processor U2, respectively. The integrating processor U2 and capacitor C1 connected in parallel are connected in series with resistor R4 and then with resistors R5 and R6 to divide the input signal voltage, and then connected to the IO_B1_57 and IO_B1_71 pins in the logic control circuit.

[0011] Preferably, the logic control circuit includes a control processor FPGA, which is connected to an optocoupler Q2 and a bipolar transistor Q4 via a resistor R32. The optocoupler Q2 and the bipolar transistor Q4 are respectively connected to a reference source circuit.

[0012] Preferably, the switching circuit includes a signal input node, a resistor, and an analog switch. The signal input node is connected to one end of the resistor R35, and the other end of the resistor R35 is connected to the input terminal of the analog switch. The output terminal of the analog switch is connected to the IO_B1_100 of the controller FPGA. The selection pin of the analog switch is connected to the IO_B1_100 pin of the FPGA controller through a resistor.

[0013] Compared with existing technologies, this invention has the following advantages: It employs diode isolation (utilizing the unidirectional conductivity of diodes) in the power supply section of the analog switch, achieving unidirectional current flow and thus solving the problem of potential continuity. This effectively prevents potential catastrophic accidents; it solves the potential continuity problem at minimal cost, ensuring stable circuit operation without uncertain or unexpected operating states. Attached Figure Description

[0014] Figure 1 This is a block diagram of an anti-submarine circuit based on an analog switch in an embodiment of this utility model;

[0015] Figure 2 This is a circuit diagram of the anti-submarine-pass circuit based on an analog switch in an embodiment of this utility model;

[0016] Figure 3 This is a circuit diagram of the integrating circuit in an embodiment of this utility model;

[0017] Figure 4 This is a circuit diagram of the logic control circuit in an embodiment of this utility model;

[0018] Figure 5 This is a circuit diagram of the switching circuit in an embodiment of the present invention. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example

[0020] like Figure 1 and Figure 2 As shown, this embodiment provides an anti-submarine-pass circuit based on an analog switch, including an integrator circuit, a logic control circuit, a switching circuit, and a reference source circuit;

[0021] The input terminal of the integrator circuit is used for current input, and the output terminal of the integrator circuit is electrically connected to the logic control circuit. The integrator circuit samples and divides the input current, and then integrates the input current.

[0022] The reference source circuit is electrically connected to the integrator circuit via a switching circuit, and the reference source circuit provides a standard current source.

[0023] The logic control circuit is electrically connected to the switching circuit. The switching circuit receives a signal from the logic control circuit to control the connection or disconnection between the reference source circuit and the integrator circuit.

[0024] In practice, the integrator circuit samples and divides the input current, then integrates it. The logic control circuit receives the voltage signal generated by the integrator circuit and uses the integration status of the integrator circuit to control the opening and closing of the switching circuit, thereby controlling the reference source circuit to provide a quantitative input current for the integrator circuit.

[0025] In this embodiment, the logic control circuit receives the integral from the integrator circuit to make a logic judgment (determine whether the switching circuit is open or closed), and also outputs a digital pulse.

[0026] The analog switch's power supply section employs diode isolation (utilizing the unidirectional conductivity of diodes) to achieve unidirectional current flow, thus solving the problem of potential continuity. This effectively prevents possible catastrophic accidents; the potential continuity problem is resolved at minimal cost, ensuring stable circuit operation without uncertain or unexpected operating states.

[0027] In another embodiment, the switching circuit includes a signal input node, a resistor, and an analog switch. The signal input node is connected to one end of the resistor R35, and the other end of the resistor R35 is connected to the input terminal of the analog switch. The output terminal of the analog switch is connected to the IO_B1_100 of the controller FPGA. The selection pin of the analog switch is connected to the IO_B1_100 pin of the FPGA controller via a resistor.

[0028] Among them, such as Figure 5 In the analog switching circuit, two diodes are connected in parallel between the A_VDD terminal and the VDD terminal of the reference source circuit. The input terminal of the diode is connected to the VDD terminal of the reference source circuit. The presence of two diodes in parallel in the switching circuit ensures that if one fails, the other can still function normally. During operation, the current provided by the reference source circuit enters the integrating circuit through the diodes in the switching circuit to provide current for the integrating circuit. However, since the current flowing into the integrating circuit through the diodes is unidirectional, there will be no backflow.

[0029] In another embodiment, such as Figure 3 The integrator circuit shown includes an integrator U2 and a capacitor C1 connected in parallel with the integrator U2. The V+ and V- pins of the integrator U2 are connected to the positive and negative terminals of the power supply and the reference power supply, respectively. The current input to the integrator circuit is connected to the IIN+ and IIN+ pins of the integrator U2. The integrator U2 and capacitor C1 connected in parallel are connected in series with resistor R4, and then with resistors R5 and R6 to divide the input signal voltage, which is then connected to the IO_B1_57 and IO_B1_71 pins of the logic control circuit. In actual operation, the integrator U2 is used to receive the input current, integrate it, and input the integrated current data to the IO_B1_57 and IO_B1_71 pins of the logic control circuit, which then performs the logical judgment.

[0030] In another embodiment, such as Figure 4 The logic control circuit shown includes a control processor, which is connected to an optocoupler Q2 and a bipolar transistor Q4 via a resistor R3. The optocoupler Q2 and the bipolar transistor Q4 are respectively connected to a reference source circuit. After receiving the integral from the integrator circuit, the control processor of the logic control circuit determines whether the received integral meets the requirements, and controls the circuit to switch between open and closed states based on the result of the determination.

[0031] The above embodiments are merely illustrative examples of the present utility model and do not constitute a limitation on the protection scope of the present utility model. All designs that are the same as or similar to the present utility model are within the protection scope of the present utility model.

Claims

1. An analog switch based anti-torpedo power supply circuit, characterized by, The integrated circuit, the logic control circuit, the switching circuit and the reference source circuit are included. The input end of the integrated circuit is used for input of current, and the output end of the integrated circuit is electrically connected with the logic control circuit. The reference source circuit is electrically connected with the integrated circuit through the switching circuit, and the reference source circuit provides a standard current source. The logic control circuit is electrically connected with the switching circuit, and the switching circuit receives a signal of the logic control circuit to control the passage or disconnection between the reference source circuit and the integrated circuit.

2. A submarine detection and communication circuit based on analog switches as claimed in claim 1, wherein, The switching circuit includes an analog switch circuit, two diodes in parallel are arranged between an A_VDD terminal in the analog switch circuit and a VDD terminal of the reference source circuit, and the input end of the diode is connected with the VDD terminal of the reference source circuit.

3. A submarine detection and communication circuit based on analog switches as claimed in claim 1, wherein, The integrated circuit includes an integral processor U2 and a capacitor C1 in parallel with the integral processor U2, the V+ and V- pins of the integral processor U2 are respectively connected with the positive and negative poles of a power supply and a reference power supply, the current input into the integrated circuit is respectively connected with the IIN+ and IIN+ pins of the integral processor U2, the integral processor U2 and the capacitor C1 in parallel are connected with the resistor R4 in series, and then the resistor R5 and R6 are used to realize input signal voltage division, and then the IO_B1_57 and IO_B1_71 pins in the logic control circuit are connected.

4. A submarine detection and communication circuit based on analog switches as claimed in claim 1, wherein, The logic control circuit includes a control processor FPGA, the control processor is connected with a photo-coupler Q2 and a bipolar transistor Q4 through a resistor R32, and the photo-coupler Q2 and the bipolar transistor Q4 are respectively connected with the reference source circuit.

5. A submarine detection and communication circuit based on analog switches as claimed in claim 1, wherein, The switching circuit includes a signal input node, a resistor and an analog switch, the signal input node is connected with one end of the resistor R35, the other end of the resistor R35 is connected with the input end of the analog switch, the output end of the analog switch is connected with the IO_B1_100 of the controller FPGA, and the selection pin of the analog switch is connected with the IO_B1_100 pin of the FPGA controller through a resistor.

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