Pulse time sequence detection circuit

Abstract

The utility model discloses a pulse time sequence detection circuit, which comprises a voltage and / or current sensor, a high voltage prevention processing unit, a power frequency signal processing unit, a sensitivity adjusting unit, a comparison unit, an optocoupler driving unit, an optocoupler isolation unit and a micro-control unit. The high-voltage power supply is good in anti-interference performance, good in temperature performance, low in power consumption and powerful in function.

Description

Technical Field

[0001] The utility model relates to the field of electronic circuit control, in particular to a pulse timing detection circuit. Background Art

[0002] A piezoelectric sensor is a sensor that uses the piezoelectric effect of certain materials to convert mechanical stress into an electrical signal. This type of sensor is widely used in fields such as vibration monitoring, acoustic measurement, and pressure detection. The core components of a piezoelectric sensor are made of piezoelectric materials, which generate an electric charge when subjected to an external force. In order to effectively utilize this generated charge and convert it into a useful signal, a specialized detection circuit is usually required. Piezoelectric materials have unique physical properties that generate an electric charge on their surface when subjected to mechanical stress (such as pressure, tension, or deformation). When the external force disappears, this charge also disappears. Therefore, piezoelectric sensors are well-suited for detecting dynamic signals such as vibrations or sound waves.

[0003] The current mature technical solution is a piezoelectric sensor detection circuit based on a charge amplifier. This circuit converts the charge generated by the piezoelectric sensor into a voltage signal through a high-input impedance charge amplifier. The circuit mainly consists of a piezoelectric sensor, a charge amplifier, and an output stage. When the piezoelectric sensor is subjected to an external force, it generates charge, which is converted by the charge amplifier into a voltage signal proportional to the input charge. The disadvantages of this technical solution are:

[0004] 1. Poor temperature stability: Temperature changes will affect the parameters of the charge amplifier, resulting in unstable output.

[0005] 2. Noise sensitivity: External electromagnetic interference can easily introduce noise. Noise can also be generated within the circuit.

[0006] 3. Complexity: To improve performance, circuit designs are often more complex, increasing manufacturing costs and debugging difficulties. Additional components are sometimes required for noise suppression and signal conditioning.

[0007] 4. High power consumption: To maintain high performance, charge amplifiers may consume more power, which may become a problem in battery-powered applications. Utility Model Content

[0008] In view of the above-mentioned defects of the prior art, the purpose of the present invention is to provide a pulse timing detection circuit with good anti-interference performance, good temperature performance, low power consumption and powerful functions.

[0009] The purpose of this utility model is achieved through such technical solution:

[0010] A pulse timing detection circuit, comprising:

[0011] Voltage and / or current sensor, collecting voltage and / or current signals;

[0012] An anti-high-voltage processing unit, whose input terminal is electrically connected to the two output terminals of the current type sensor, eliminates the high-voltage signal output by the non-voltage and / or current sensor;

[0013] The power frequency signal processing unit has an input end electrically connected to the output end of the high voltage protection processing unit, and shields the voltage and / or current signals emitted by the non-voltage and / or current sensors;

[0014] A sensitivity adjustment unit, which adjusts the output voltage value;

[0015] A comparison unit, wherein the non-inverting input terminal is electrically connected to the output terminal of the power frequency signal processing unit and the reverse input terminal is electrically connected to the output terminal of the sensitivity adjustment unit, and determines whether the voltage and / or current sensor sends a voltage and / or current signal;

[0016] The optical coupler driving unit has an input terminal electrically connected to the output terminal of the comparison unit to reduce the level of its input terminal;

[0017] An optocoupler isolation unit, wherein the input end is electrically connected to the output end of the optocoupler driving unit to electrically isolate the input end and the output end thereof;

[0018] The micro control unit has an input end electrically connected to the output end of the optical coupling isolation unit.

[0019] Furthermore, the anti-high-pressure processing unit includes:

[0020] The two ends of the unidirectional transient voltage suppression diode are electrically connected to the two output ends of the voltage and / or current sensor respectively; the positive electrode of the unidirectional transient voltage suppression diode is grounded, and the output negative electrode of the voltage and / or current sensor is grounded.

[0021] Furthermore, the power frequency signal processing unit includes:

[0022] a 55th resistor, a first end of which is electrically connected to the high-voltage protection processing unit;

[0023] a 49th capacitor, a first end of which is electrically connected to the high-voltage protection processing unit;

[0024] a 55th capacitor, having a first end electrically connected to the second end of the 55th resistor and a second end grounded;

[0025] a 63rd resistor, having a first end electrically connected to the second end of the 49th capacitor and a second end grounded;

[0026] a 50th capacitor, a first end electrically connected to the second end of the 49th capacitor;

[0027] a 56th resistor having a first end electrically connected to the second end of the 50th capacitor, and a second end electrically connected to the first end of the 55th capacitor;

[0028] a 53rd resistor, having a first end electrically connected to the second end of the 50th capacitor, and a second end electrically connected to the non-inverting input terminal of the comparison unit;

[0029] The 53rd capacitor has a first end electrically connected to the second end of the 53rd resistor, and a second end grounded.

[0030] Furthermore, the resistance of the 55th resistor is 22K; the 49th capacitor is 150nF; the 55th capacitor is 330nF; the resistance of the 63rd resistor is 11K; the 50th capacitor is 150nF; the resistance of the 56th resistor is 22K; the resistance of the 53rd resistor is 1K; and the 53rd capacitor is 100nF.

[0031] Furthermore, the sensitivity adjustment unit includes:

[0032] a 59th resistor, having a first end electrically connected to the inverting input terminal of the comparison unit and a second end connected to a positive voltage;

[0033] The adjustable resistor has a fixed pin electrically connected to the first end of the 59th resistor, and the movable pins are electrically connected to the comparison unit and grounded respectively.

[0034] Furthermore, the resistance of the 59th resistor is 10K, and the maximum resistance of the adjustable resistor is 10K; the second end of the 59th resistor is connected to a 3.3V voltage.

[0035] Furthermore, the optical coupler driving unit includes:

[0036] a 49th resistor, a first end of which is electrically connected to the output end of the comparison unit;

[0037] a 52nd resistor, having a first end electrically connected to the second end of the 49th resistor and a second end grounded;

[0038] The Q8 transistor has a base electrically connected to the second end of the 49th resistor and an emitter grounded;

[0039] a 47th capacitor, having a first end electrically connected to the collector of the Q8th transistor and a second end grounded;

[0040] a 45th resistor having a first end connected to a positive voltage and a second end electrically connected to the collector of the Q8 transistor;

[0041] The Q5 transistor has a base electrically connected to the second end of the 45th resistor, an emitter electrically connected to the ground, and a collector electrically connected to the input end of the optocoupler isolation unit.

[0042] Furthermore, the resistance of the 49th resistor is 1K; the resistance of the 52nd resistor is 4.7K; the 47th capacitor is 1uF; the resistance of the 45th resistor is 3K; and the first terminal of the 45th resistor is connected to a 3.3V voltage.

[0043] Furthermore, the optical coupling isolation unit includes:

[0044] Optocoupler;

[0045] a 42nd resistor, having a first end electrically connected to the output end of the optocoupler driving unit and the cathode of the light emitting diode of the optocoupler, and a second end connected to a positive voltage;

[0046] a 39th resistor having a first end electrically connected to the anode of the light emitting diode of the photocoupler and a second end electrically connected to the second end of the 42nd resistor;

[0047] The 43rd resistor has a first end electrically connected to the collector of the photocoupler and the input terminal of the micro control unit respectively; and a second end electrically connected to the positive voltage and the enable pin of the photocoupler respectively.

[0048] Furthermore, the resistance of the 42nd resistor is 1K; the resistance of the 39th resistor is 510R; the resistance of the 43rd resistor is 10K; the second terminal of the 42nd resistor is connected to a 5V voltage; and the second terminal of the 43rd resistor is connected to a 3.3V voltage.

[0049] Due to the adoption of the above technical solution, the utility model has the following advantages:

[0050] 1. Voltage and / or current sensors are extremely susceptible to static electricity in dry, cold environments. Static electricity can generate a high voltage at the input terminal, which can easily damage internal electronic components. Apply anti-static treatment to the input terminal of the voltage and / or current sensor to protect its internal electronic components from static interference.

[0051] 2. Power frequency signals can easily affect the detection of piezoelectric pulse signals. By shielding the voltage and / or current signals emitted by non-voltage and / or current sensors, the circuit is not interfered with by external high-frequency or power frequency signals, thus ensuring the accuracy of collected data.

[0052] 3. All temperature-sensitive components in the entire circuit have good temperature stability. The entire circuit has low power consumption, no high-power devices, and is composed almost entirely of passive components. The entire circuit is powerful and can be used with voltage and / or current sensors.

[0053] 4. The circuit debugging speed of the utility model is fast and the circuit manufacturing cost is low.

[0054] Other advantages, objectives and features of the present invention will be described in part in the following description and will be apparent to those skilled in the art based on an examination of the following or may be learned from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The accompanying drawings of the present invention are as follows:

[0056] Figure 1 Schematic diagram of the pulse timing detection circuit in this embodiment.

[0057] Figure 2 4 is a circuit diagram of the voltage and / or current sensor, the high voltage protection processing unit, and the power frequency signal processing unit in the pulse timing detection circuit in this embodiment.

[0058] Figure 3 4 is a circuit diagram of the sensitivity adjustment unit and the comparison unit in the pulse timing detection circuit in this embodiment.

[0059] Figure 4 is a circuit diagram of the optocoupler driving unit in the pulse timing detection circuit in this embodiment.

[0060] Figure 5 is a circuit diagram of the optocoupler isolation unit in the pulse timing detection circuit in this embodiment.

[0061] Figure 6 4 is a circuit diagram of a dual-path pulse timing detection circuit in this embodiment.

[0062] Figure 7 Schematic diagram of the application of the circuit of this embodiment in the second measurement test. DETAILED DESCRIPTION

[0063] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0064] Example:

[0065] like Figure 1 As shown, a pulse timing detection circuit includes:

[0066] The voltage and / or current sensor collects voltage and / or current signals; the voltage and / or current sensor can be a conventional piezoelectric sensor.

[0067] An anti-high-voltage processing unit, whose input terminal is electrically connected to the two output terminals of the current type sensor, eliminates the high-voltage signal output by the non-voltage and / or current sensor;

[0068] The power frequency signal processing unit has an input end electrically connected to the output end of the high voltage protection processing unit, and shields the voltage and / or current signals emitted by the non-voltage and / or current sensors;

[0069] A sensitivity adjustment unit, which adjusts the output voltage value;

[0070] The comparison unit has a non-inverting input terminal electrically connected to the output terminal of the power frequency signal processing unit and a reverse input terminal electrically connected to the output terminal of the sensitivity adjustment unit, and determines whether the voltage and / or current sensor sends a voltage and / or current signal; the comparison unit can use a conventional comparison chip.

[0071] The optical coupler driving unit has an input terminal electrically connected to the output terminal of the comparison unit to reduce the level of its input terminal;

[0072] An optocoupler isolation unit, wherein the input end is electrically connected to the output end of the optocoupler driving unit to electrically isolate the input end and the output end thereof;

[0073] The micro control unit has an input end electrically connected to the output end of the optical coupling isolation unit.

[0074] like Figure 2 As shown, the anti-high-pressure processing unit includes:

[0075] The two ends of the unidirectional transient voltage suppression diode are electrically connected to the two output ends of the voltage and / or current sensor respectively; the positive electrode of the unidirectional transient voltage suppression diode is grounded, and the output negative electrode of the voltage and / or current sensor is grounded.

[0076] like Figure 2 As shown, the power frequency signal processing unit includes:

[0077] a 55th resistor, a first end of which is electrically connected to the high-voltage protection processing unit;

[0078] a 49th capacitor, a first end of which is electrically connected to the high-voltage protection processing unit;

[0079] a 55th capacitor, having a first end electrically connected to the second end of the 55th resistor and a second end grounded;

[0080] a 63rd resistor, having a first end electrically connected to the second end of the 49th capacitor and a second end grounded;

[0081] a 50th capacitor, a first end electrically connected to the second end of the 49th capacitor;

[0082] a 56th resistor having a first end electrically connected to the second end of the 50th capacitor, and a second end electrically connected to the first end of the 55th capacitor;

[0083] a 53rd resistor, having a first end electrically connected to the second end of the 50th capacitor, and a second end electrically connected to the non-inverting input terminal of the comparison unit;

[0084] The 53rd capacitor has a first end electrically connected to the second end of the 53rd resistor, and a second end grounded.

[0085] The resistance of the 55th resistor is 22K; the 49th capacitor is 150nF; the 55th capacitor is 330nF; the resistance of the 63rd resistor is 11K; the 50th capacitor is 150nF; the resistance of the 56th resistor is 22K; the resistance of the 53rd resistor is 1K; and the 53rd capacitor is 100nF.

[0086] like Figure 3 As shown, the sensitivity adjustment unit includes:

[0087] a 59th resistor, having a first end electrically connected to the inverting input terminal of the comparison unit and a second end connected to a positive voltage;

[0088] An adjustable resistor, a fixed pin is electrically connected to the first end of the 59th resistor, and the movable pins are electrically connected to the comparison unit and grounded respectively; the resistance of the 59th resistor is 10K, and the maximum resistance of the adjustable resistor is 10K; the second end of the 59th resistor is connected to a 3.3V voltage.

[0089] like Figure 4 As shown, the optical coupler driving unit includes:

[0090] a 49th resistor, a first end of which is electrically connected to the output end of the comparison unit;

[0091] a 52nd resistor, having a first end electrically connected to the second end of the 49th resistor and a second end grounded;

[0092] The Q8 transistor has a base electrically connected to the second end of the 49th resistor and an emitter grounded;

[0093] a 47th capacitor, having a first end electrically connected to the collector of the Q8th transistor and a second end grounded;

[0094] a 45th resistor having a first end connected to a positive voltage and a second end electrically connected to the collector of the Q8 transistor;

[0095] The Q5 transistor has a base electrically connected to the second end of the 45th resistor, an emitter electrically connected to the ground, and a collector electrically connected to the input end of the optocoupler isolation unit.

[0096] The resistance of the 49th resistor is 1K; the resistance of the 52nd resistor is 4.7K; the 47th capacitor is 1uF; the resistance of the 45th resistor is 3K; and the first terminal of the 45th resistor is connected to a 3.3V voltage.

[0097] like Figure 5 As shown, the optical coupling isolation unit includes:

[0098] Optocoupler;

[0099] a 42nd resistor, having a first end electrically connected to the output end of the optocoupler driving unit and the cathode of the light emitting diode of the optocoupler, and a second end connected to a positive voltage;

[0100] a 39th resistor having a first end electrically connected to the anode of the light emitting diode of the photocoupler and a second end electrically connected to the second end of the 42nd resistor;

[0101] a 43rd resistor, having a first end electrically connected to the collector of the photocoupler and the input terminal of the microcontroller, and a second end electrically connected to a positive voltage and an enable pin of the photocoupler;

[0102] The resistance of the 42nd resistor is 1K; the resistance of the 39th resistor is 510R; the resistance of the 43rd resistor is 10K; the second end of the 42nd resistor is connected to a 5V voltage; the second end of the 43rd resistor is connected to a 3.3V voltage.

[0103] The utility model circuit works like this:

[0104] The voltage and / or current sensor collects dynamic signals and converts the collected dynamic signals into current and / or voltage signals for output;

[0105] Performing anti-static treatment on the current and / or voltage signals output by the voltage and / or current sensor to eliminate high-voltage signals other than those output by the voltage and / or current sensor;

[0106] Shielding the voltage and / or current signals emitted by the non-voltage and / or current sensors after anti-static treatment;

[0107] Adjust the comparison voltage value according to the voltage and / or current sensor type;

[0108] Comparing the voltage value output by the voltage and / or current sensor with the comparison voltage value, outputting a voltage signal if the collected voltage signal is higher than a predetermined adjustable voltage, and not outputting a voltage signal if the collected voltage signal is not higher than the comparison voltage value;

[0109] Adjust the output voltage signal to a low level signal;

[0110] The low-level signal is processed by optical coupling isolation and output to the micro control unit.

[0111] like Figure 6 As shown, the circuit of the present invention can perform dual-channel detection, that is, two groups of circuits are collected at the same time, and the GS8552 chip is used in the comparison unit to compare and output the two voltage values, which can reduce the use of electronic components. The two-channel detection can make the detection results more accurate.

[0112] The application of the detection circuit and method of the utility model in the field of electronic detonators is as follows: Figure 7 As shown, the microcontroller controls the operation of the electronic module with the charge head of the electronic detonator, causing the detonator to explode. The vibration and shock wave generated after the explosion are received by the piezoelectric sensor, and then processed by the circuit of the utility model (piezoelectric second impulse signal detection circuit) and transmitted to the microcontroller, and the microcontroller displays the second information.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A pulse timing detection circuit, characterized in that: include: Voltage and / or current sensor, collecting voltage and / or current signals; An anti-high-voltage processing unit, whose input terminal is electrically connected to the two output terminals of the current type sensor, eliminates the high-voltage signal output by the non-voltage and / or current sensor; The power frequency signal processing unit has an input end electrically connected to the output end of the high voltage protection processing unit, and shields the voltage and / or current signals emitted by the non-voltage and / or current sensors; A sensitivity adjustment unit, which adjusts the output voltage value; A comparison unit, wherein the non-inverting input terminal is electrically connected to the output terminal of the power frequency signal processing unit and the reverse input terminal is electrically connected to the output terminal of the sensitivity adjustment unit, and determines whether the voltage and / or current sensor sends a voltage and / or current signal; The optical coupler driving unit has an input terminal electrically connected to the output terminal of the comparison unit to reduce the level of its input terminal; An optocoupler isolation unit, wherein the input end is electrically connected to the output end of the optocoupler driving unit to electrically isolate the input end and the output end thereof; The micro control unit has an input end electrically connected to the output end of the optical coupling isolation unit.

2. The pulse timing detection circuit according to claim 1, characterized in that: The anti-high-pressure processing unit includes: The two ends of the unidirectional transient voltage suppression diode are electrically connected to the two output ends of the voltage and / or current sensor respectively; the positive electrode of the unidirectional transient voltage suppression diode is grounded, and the output negative electrode of the voltage and / or current sensor is grounded.

3. The pulse timing detection circuit according to claim 1, characterized in that: The power frequency signal processing unit includes: a 55th resistor, a first end of which is electrically connected to the high-voltage protection processing unit; a 49th capacitor, a first end of which is electrically connected to the high-voltage protection processing unit; a 55th capacitor, having a first end electrically connected to the second end of the 55th resistor and a second end grounded; a 63rd resistor, having a first end electrically connected to the second end of the 49th capacitor and a second end grounded; a 50th capacitor, a first end electrically connected to the second end of the 49th capacitor; a 56th resistor having a first end electrically connected to the second end of the 50th capacitor, and a second end electrically connected to the first end of the 55th capacitor; a 53rd resistor, having a first end electrically connected to the second end of the 50th capacitor, and a second end electrically connected to the non-inverting input terminal of the comparison unit; The 53rd capacitor has a first end electrically connected to the second end of the 53rd resistor, and a second end grounded.

4. The pulse timing detection circuit according to claim 3, characterized in that: The resistance of the 55th resistor is 22K; the 49th capacitor is 150nF; the 55th capacitor is 330nF; the resistance of the 63rd resistor is 11K; the 50th capacitor is 150nF; the resistance of the 56th resistor is 22K; the resistance of the 53rd resistor is 1K; and the 53rd capacitor is 100nF.

5. The pulse timing detection circuit according to claim 1, characterized in that: The sensitivity adjustment unit includes: a 59th resistor, having a first end electrically connected to the inverting input terminal of the comparison unit and a second end connected to a positive voltage; The adjustable resistor has a fixed pin electrically connected to the first end of the 59th resistor, and the movable pins are electrically connected to the comparison unit and grounded respectively.

6. The pulse timing detection circuit according to claim 5, characterized in that: The resistance of the 59th resistor is 10K, and the maximum resistance of the adjustable resistor is 10K; the second end of the 59th resistor is connected to a 3.3V voltage.

7. The pulse timing detection circuit according to claim 1, characterized in that: The optical coupler driving unit includes: a 49th resistor, a first end of which is electrically connected to the output end of the comparison unit; a 52nd resistor, having a first end electrically connected to the second end of the 49th resistor and a second end grounded; The Q8 transistor has a base electrically connected to the second end of the 49th resistor and an emitter grounded; a 47th capacitor, having a first end electrically connected to the collector of the Q8th transistor and a second end grounded; a 45th resistor having a first end connected to a positive voltage and a second end electrically connected to the collector of the Q8 transistor; The Q5 transistor has a base electrically connected to the second end of the 45th resistor, an emitter electrically connected to the ground, and a collector electrically connected to the input end of the optocoupler isolation unit.

8. The pulse timing detection circuit according to claim 7, characterized in that: The resistance of the 49th resistor is 1K; the resistance of the 52nd resistor is 4.7K; the 47th capacitor is 1uF; the resistance of the 45th resistor is 3K; and the first terminal of the 45th resistor is connected to a 3.3V voltage.

9. The pulse timing detection circuit according to claim 1, characterized in that: The optical coupling isolation unit includes: Optocoupler; a 42nd resistor, having a first end electrically connected to the output end of the optocoupler driving unit and the cathode of the light emitting diode of the optocoupler, and a second end connected to a positive voltage; a 39th resistor having a first end electrically connected to the anode of the light emitting diode of the photocoupler and a second end electrically connected to the second end of the 42nd resistor; The 43rd resistor has a first end electrically connected to the collector of the photocoupler and the input terminal of the micro control unit respectively; and a second end electrically connected to the positive voltage and the enable pin of the photocoupler respectively.

10. The pulse timing detection circuit according to claim 9, characterized in that: The resistance of the 42nd resistor is 1K; the resistance of the 39th resistor is 510R; the resistance of the 43rd resistor is 10K; the second end of the 42nd resistor is connected to a 5V voltage; the second end of the 43rd resistor is connected to a 3.3V voltage.

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