Power-on instant analog quantity detection circuit

Abstract

The utility model belongs to the technical field of electronics, and particularly relates to a power-on instant analog quantity detection circuit. The detection circuit is used for collecting high-frequency signals, storing the high-frequency signals in a capacitor and carrying out discharge collection when needed; the detection circuit comprises a sampling hold circuit, a capacitor charging circuit, a discharging circuit and a follower circuit which are connected in sequence. The input end of the sampling and holding circuit receives external high-frequency signals, the high-frequency signals are collected and stored in the capacitor charging circuit, and the collected high-frequency signals are restored through the discharging circuit when needed.

Description

Technical Field

[0001] This utility model belongs to the field of electronic technology, and in particular relates to an analog quantity detection circuit for instantaneous power-on. Background Technology

[0002] With the rapid development of my country's economy, the power electronics industry has entered a period of rapid development. Related technologies have been widely applied to aerospace and related industries, greatly contributing to the rapid development of my country's aerospace industry. In order to ensure flight safety, it is necessary to monitor its flight status in order to better understand its mechanical condition and provide valuable information for flight.

[0003] A recorder typically needs to be started up before it can function properly. However, considering that product startup takes time, if the recording device has not yet started up properly when data transmission begins, the recording device will be unable to collect the data transmitted during this period, resulting in data loss. For high-frequency signals with frequencies between 3MHz and 30MHz, the ADC's sampling rate is insufficient, making it difficult to collect high-frequency signals. Utility Model Content

[0004] To address the problems in the background technology, this utility model provides a power-on instantaneous analog quantity detection circuit, which mainly solves two problems: First, the recorder can only work normally after normal startup, but the device startup takes time, which will cause the data sent during the device startup process to be uncollected. Therefore, the design stores the data sent during the device startup period in a passive device and then reads it to ensure the integrity of the data. Second, for high-frequency signals with frequencies between 3MHz and 30MHz, the ADC's own sampling rate is insufficient to collect them. Through the designed instantaneous analog quantity detection circuit, peak voltages can be collected and held, which effectively solves this problem.

[0005] To achieve the above objectives, the present invention adopts the following technical solution.

[0006] A power-on analog signal detection circuit is provided, wherein the detection circuit is used to acquire high-frequency signals and store them in a capacitor, and to discharge and acquire them when needed.

[0007] The detection circuit includes: a sample-and-hold circuit, a capacitor charging circuit, a discharging circuit, and a follower circuit connected in sequence;

[0008] The input terminal of the sample-and-hold circuit receives an external high-frequency signal, acquires the high-frequency signal and stores it in the capacitor charging circuit, and restores the acquired high-frequency signal through the discharge circuit when needed.

[0009] Furthermore,

[0010] The sample-and-hold circuit consists of an amplifier and a diode V1. The high-frequency signal is input from the positive input terminal of the amplifier, and a voltage drop of 0.7V is achieved through the diode V1 to reach the output terminal of the amplifier.

[0011] Furthermore,

[0012] The capacitor charging circuit consists of diode V2, resistor R2, capacitor C1 and ground. The high-frequency signal is sampled and held and then input through the positive terminal of diode V2. The capacitor C1 is charged through resistor R2. The function of diode V2 is to prevent excessive current and excessive charging from damaging capacitor C1.

[0013] Furthermore,

[0014] The discharge circuit consists of a relay, an MCU, and a resistor R3. When it is necessary to view the recorded data, the corresponding pin of the MCU controls the relay to close, and the capacitor C1 discharges to restore the collected high-frequency signal.

[0015] Furthermore,

[0016] The follower circuit consists of a follower amplifier and a resistor R1. The high-frequency signal reaches the positive input terminal of the follower amplifier through the resistor R2. One end of the resistor R1 is connected to the output terminal of the follower amplifier as the Vout terminal, and the other end of the resistor R1 is fed back to the negative input terminal of the amplifier, forming a deep negative feedback circuit to perform the feedback process.

[0017] Furthermore, the high-frequency signal is a signal between 3MHz and 30MHz.

[0018] This invention provides an analog signal detection circuit for instantaneous power-on. Through resistors, capacitors, and a "follow-and-hold circuit + processor", it not only solves the problem of data loss due to the recording device not starting at the moment of power-on, but also realizes the acquisition and holding of instantaneous analog signals. It avoids the problem of signal loss due to insufficient sampling frequency during the acquisition of high-frequency signals, and maintains the integrity of the sampled signal information very well. Attached Figure Description

[0019] Figure 1 A schematic diagram of an analog quantity detection circuit for instantaneous power-on provided by this utility model;

[0020] Figure 2 This utility model provides a circuit diagram for detecting analog quantities at the moment of power-on. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings.

[0022] This utility model embodiment provides an analog quantity detection circuit for instantaneous power-on. The detection circuit is used to collect high-frequency signals and store them in a capacitor, and to collect them by discharge when needed.

[0023] like Figure 1 As shown, the detection circuit includes: a sample-and-hold circuit, a capacitor charging circuit, a discharging circuit, and a follower circuit connected in sequence; the input terminal of the sample-and-hold circuit receives an external high-frequency signal, collects the high-frequency signal and stores it in the capacitor charging circuit, and restores the collected high-frequency signal through the discharging circuit when needed.

[0024] like Figure 2 As shown, the sample-and-hold circuit consists of amplifier 1 and diode V2. The high-frequency signal is input from the positive input terminal of amplifier 1. According to the virtual short, Vin+ equals Vin-. There is a voltage drop of 0.7V through V1 to reach the amplifier output.

[0025] Capacitor charging circuit: This circuit consists of diode V2, resistor R2, capacitor C1 and ground. After sampling and holding, the input is through the positive terminal of V2 and charges capacitor C1 through R2. The function of V2 is to prevent excessive current and charging too fast, which could damage capacitor C1.

[0026] Discharge circuit: This circuit consists of a relay, MCU and R3. When it is necessary to view the recorded data, the corresponding pin of the MCU controls the relay to close, the capacitor discharges, and the collected high-frequency signal can be restored.

[0027] Follower circuit: This circuit consists of a follower amplifier and resistor R1. The high-frequency signal reaches the positive input terminal of the follower amplifier through R2. According to the virtual short rule, the voltage at the positive input terminal is equal to the voltage at the negative input terminal. Therefore, the voltage at the positive input terminal is equal to Vout. Since Vout and the R1 amplifier form a deep negative feedback circuit, there is a voltage drop of 0.7V through V2. The voltage of Vout is equal to Vin- and less than Vin+. According to the amplifier characteristics, when Vin+ is greater than Vin-, Vin+ is output. The feedback process continues, and finally the signal output is Vout.

[0028] The meaning of ADC usually refers to the ADC7606 data acquisition chip.

[0029] This invention designs an analog signal detection circuit for instantaneous power-on, primarily addressing the following two issues. First, a recorder typically requires normal startup to function properly. However, considering the startup time, if data transmission begins before the recording device has fully started, the device may miss data transmission during this period, resulting in data loss. The instantaneous power-on analog signal acquisition circuit stores the data transmitted during this startup period in a passive device and uses the CPU to restore the data stored in the passive device, ensuring data integrity. Second, for high-frequency signals between 3MHz and 30MHz, considering the insufficient sampling rate of the ADC, which makes high-frequency signal acquisition difficult, this invention's instantaneous analog signal detection circuit features peak hold, effectively solving this problem and ensuring data security.

Claims

1. A circuit for detecting analog quantities at the moment of power-on, characterized in that, The detection circuit is used to acquire high-frequency signals and store them in a capacitor, which is then discharged and acquired when needed. The detection circuit includes: a sample-and-hold circuit, a capacitor charging circuit, a discharging circuit, and a follower circuit connected in sequence; The input terminal of the sample-and-hold circuit receives an external high-frequency signal, acquires the high-frequency signal and stores it in the capacitor charging circuit, and restores the acquired high-frequency signal through the discharge circuit when needed.

2. The analog quantity detection circuit for instantaneous power-on as described in claim 1, characterized in that, The sample-and-hold circuit consists of an amplifier and a diode V1. The high-frequency signal is input from the positive input terminal of the amplifier, and a voltage drop of 0.7V is achieved through the diode V1 to reach the output terminal of the amplifier.

3. The analog quantity detection circuit for instantaneous power-on as described in claim 2, characterized in that, The capacitor charging circuit consists of diode V2, resistor R2, capacitor C1 and ground. The high-frequency signal is sampled and held and then input through the positive terminal of diode V2, and charges capacitor C1 through resistor R2.

4. The analog quantity detection circuit for instantaneous power-on as described in claim 3, characterized in that, The discharge circuit consists of a relay, an MCU, and a resistor R3. When it is necessary to view the recorded data, the corresponding pin of the MCU controls the relay to close, and the capacitor C1 discharges to restore the collected high-frequency signal.

5. The analog quantity detection circuit for instantaneous power-on as described in claim 4, characterized in that, The follower circuit consists of a follower amplifier and a resistor R1. The high-frequency signal reaches the positive input terminal of the follower amplifier through the resistor R2. One end of the resistor R1 is connected to the output terminal of the follower amplifier as the Vout terminal, and the other end of the resistor R1 is fed back to the negative input terminal of the amplifier, forming a deep negative feedback circuit to perform the feedback process.

6. The analog quantity detection circuit for instantaneous power-on as described in claim 1, characterized in that, The high-frequency signal is a signal between 3MHz and 30MHz.

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