Circuit of portable oscilloscope

Abstract

The utility model relates to the technical field of electronic measuring instruments, in particular to a circuit of a portable oscilloscope, which comprises a control module, a power management module, a front sampling module, a bias operational amplifier module, a man-machine interaction knob module, a man-machine interaction key module and a communication power supply module. Low-frequency signal waveforms are collected and displayed, and subsequent debugging, maintenance and expansion upgrading are facilitated; the power supply voltage is 5V and 2.5 V, the power consumption is small, the work is separated from the commercial power, a power supply transformation circuit is omitted, and a foundation is laid for reducing the size and the weight of the oscilloscope by combining the simple connection among the modules.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic measuring instruments, in particular to a circuit of a portable oscilloscope. Background Art

[0002] Currently, in the field of electronic measuring instruments, the main instruments used to observe electrical signal waveforms are analog oscilloscopes, desktop digital oscilloscopes, and virtual oscilloscopes. While all of these instruments can observe electrical signal waveforms, analog oscilloscopes struggle to increase their measurement bandwidth and rely on electron guns, fluorescent screens, and other factors, lacking the ability to directly display information such as the frequency and amplitude of the measured electrical signal. Desktop digital oscilloscopes are generally used in indoor environments such as laboratories and research institutes. They require high measurement accuracy and a wide bandwidth and amplitude range for measuring signals, resulting in bulky size. Furthermore, they operate under high-voltage AC power, consume high power, and require connection to mains electricity, making them inconvenient for on-site or outdoor testing. Virtual oscilloscopes, while compact, require connection to a laptop and cannot be used without a computer, resulting in significant limitations and inconvenience.

[0003] Therefore, it is necessary to design a circuit for a portable oscilloscope to meet the requirements of the portable oscilloscope being small in size, not requiring mains power supply, and having low power consumption. Summary of the Invention

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a circuit for a portable oscilloscope to meet the requirements of the portable oscilloscope being small in size, not requiring mains power supply and having low power consumption.

[0005] In order to achieve the above-mentioned purpose, the utility model is a circuit of a portable oscilloscope, including a control module, a power management module, a pre-sampling module, a bias op amp module, a human-computer interaction knob module, a human-computer interaction button module, and a communication power supply module. The 5V interface of the communication power supply module is divided into three paths and respectively connected to the +5V interface of the power management module 1, the +5V interface of the power management module 2, and the +5V interface of the bias op amp module. The -5V interface of the power management module 1 is connected to the -5V interface of the bias op amp module, and the +2.5V interface of the power management module 2 is connected to the The +2.5V interface of the bias op amp module is connected, the output interface of the pre-sampling module is connected to the input interface of the bias op amp module, the ADC output interface of the bias op amp module is connected to the ADC sampling interface of the control module, the human-computer interaction interface 1, human-computer interaction interface 2, and human-computer interaction interface 3 of the control module are connected to interface 1, interface 2, and interface 3 of the human-computer interaction knob module in sequence, and the human-computer interaction interface 4, human-computer interaction interface 5, and human-computer interaction interface 6 of the control module are connected to interface 1, interface 2, and interface 3 of the human-computer interaction button module in sequence.

[0006] The control module includes a main control chip, a display chip, an indicator light, a resistor, a sliding rheostat, a capacitor, a crystal oscillator, and a terminal. The ADC sampling interface, human-computer interaction interface 1, human-computer interaction interface 2, human-computer interaction interface 3, human-computer interaction interface 4, human-computer interaction interface 5, and human-computer interaction interface 6 of the control module are respectively connected to pins 35, 97, 98, 1, 60, 61, and 62 of the main control chip. Pin 36 of the main control chip is divided into two paths and connected to one end of resistor 4 and one end of resistor 5 respectively. The other end of resistor 4 is connected to the 5V power supply terminal. Pin 24 of the main control chip is connected in series with resistor 1 and then connected to the anode of indicator light 1 and the anode of indicator light 2. The cathode of indicator light 2 is connected to one end of resistor 2, pins 15 and 16 of the main control chip are connected to pins 3 and 2 of terminal 1 respectively, pin 1 of terminal 1 is connected to the VCC power supply end, pin 81 of the main control chip is divided into two ways and connected to pin 7 of the display chip and pin 2 of terminal 2 respectively, pin 82 of the main control chip is divided into two ways and connected to pin 8 of the display chip and pin 3 of terminal 2 respectively, pin 83 of the main control chip is divided into two ways and connected to pin 9 of the display chip and pin 4 of terminal 2 respectively, pin 84 of the main control chip is divided into two ways and connected to pin 10 of the display chip and pin 5 of terminal 2 respectively, and pin 8 of the main control chip is divided into two ways and connected to pin 11 of the display chip and pin 5 of terminal 2 respectively. Pin 5 is divided into two ways and connected to pin 11 of the display chip and pin 6 of terminal 2 respectively. Pin 86 of the main control chip is divided into two ways and connected to pin 12 of the display chip and pin 7 of terminal 2 respectively. Pin 87 of the main control chip is divided into two ways and connected to pin 13 of the display chip and pin 8 of terminal 2 respectively. Pin 88 of the main control chip is divided into two ways and connected to pin 14 of the display chip and pin 9 of terminal 2 respectively. Pin 55, pin 56 and pin 57 of the main control chip are connected to pin 4, pin 5 and pin 6 of the display chip respectively. Pin 1 of terminal 2 is divided into four ways and connected to the VCC power supply end, one end of the sliding resistor, pin 2 of the display chip, pin 15 No. 1 is connected to pin 1 of the display chip, No. 3 is connected to the sliding end of the sliding rheostat, No. 12 of the main control chip is divided into two ways and is respectively connected to one end of the crystal oscillator and one end of capacitor seven, No. 13 of the main control chip is divided into two ways and is respectively connected to the other end of the crystal oscillator and one end of capacitor eight, No. 14 of the main control chip is divided into two ways and is respectively connected to one end of resistor nine and one end of capacitor nine, the other end of resistor nine is connected to the 3.3V power supply end, the other end of the sliding rheostat, the other end of resistor two, the other end of resistor five, the cathode of indicator light one, No. 4 of terminal one, No. 1 pin of the display chip, No. 16 pin, No. 94 pin of the main control chip, the other end of capacitor seven, the other end of capacitor eight, and the other end of capacitor nine are grounded.

[0007] The communication power supply module includes a TYPEC chip and a toggle switch. The 5V interface of the communication power supply module is connected to pin 1 of toggle switch 2. Pin 2 of toggle switch 2 is divided into three paths and is respectively connected to the VCC power supply end, pin A4 and pin A9 of the TYPEC chip. Pin 0, pin A1 and pin A12 of the TYPEC chip are grounded.

[0008] The power management module 1 includes a power flip chip, an electrolytic capacitor, and an inductor. The +5V interface of the power management module 1 is divided into three paths, which are respectively connected to pin 8 of the power flip chip, the positive electrode of electrolytic capacitor 2, and one end of inductor 1. The other end of inductor 1 is connected to the 5V power supply end. The -5V interface of the power management module 1 is divided into two paths, which are respectively connected to pin 5 of the power flip chip and the negative electrode of electrolytic capacitor 3. Pin 2 of the power flip chip is connected to the positive electrode of electrolytic capacitor 1, pin 4 of the power flip chip is connected to the negative electrode of electrolytic capacitor 1, the negative electrode of electrolytic capacitor 2, the positive electrode of electrolytic capacitor 3, and pin 3 of the power flip chip are grounded. The power management module 2 includes a voltage stabilizing chip, a resistor, and a capacitor. The +5V interface of the power management module 2 is connected to one end of resistor 12. The +2.5V interface of the power management module 2 is divided into four paths, which are respectively connected to the other end of resistor 12, one end of capacitor 10, pin 1 and pin 2 of the voltage stabilizing chip. Pin 3 of the voltage stabilizing chip and the other end of capacitor 10 are grounded.

[0009] The pre-sampling module includes a toggle switch, a capacitor, a resistor, a diode, and a terminal. The output interface of the pre-sampling module is divided into three paths and respectively connected to the cathode of diode three, the anode of diode four, and one end of resistor seven. The anode of diode three is connected to the cathode of diode five, and the cathode of diode four is connected to the anode of diode six. The other end of resistor seven is divided into four paths and respectively connected to one end of resistor six, one end of resistor eight, one end of capacitor five, and one end of capacitor six. The other end of resistor six is divided into three paths and respectively connected to the other end of capacitor five, one end of capacitor four, and pin 3 of toggle switch one. The other end of capacitor four is connected to pin 1 of toggle switch one, pin 2 of toggle switch one is connected to pin 1 of terminal three, and the anode of diode five, the cathode of diode six, the other end of resistor eight, the other end of capacitor six, pin 2 of terminal three, and pin 3 are grounded.

[0010] The model of the TYPEC chip is TYPE-CF-12 / 16P-OT0.8-L6.5, and the model of the toggle switch 1 and toggle switch 2 is SS-12D02-VG4.

[0011] The bias op amp module includes an op amp chip, a resistor, and a capacitor. The input interface of the bias op amp module is connected to pin 3 of the op amp chip. The +5V interface of the bias op amp module is divided into three paths and respectively connected to one end of resistor 17, pin 1, and pin 5 of the op amp chip. The -5V interface of the bias op amp module is connected to pin 11 of the op amp chip. The +2.5V interface of the bias op amp module is connected to one end of resistor 21. The ADC output interface of the bias op amp module is divided into two paths and respectively connected to one end of resistor 13 and one end of capacitor 14. The other end of resistor 17 is divided into two paths and respectively connected to one end of resistor 20 and pin 2 of the op amp chip. Pin 4 of the op amp chip is connected to one end of capacitor 18, the other end of resistor 21 is divided into two paths and is respectively connected to one end of resistor 22 and pin 12 of the op amp chip, the other end of resistor 22 is divided into two paths and is respectively connected to pins 6 and 7 of the op amp chip, the other end of resistor 13 is divided into three paths and is respectively connected to one end of capacitor 13, one end of resistor 18 and pin 14 of the op amp chip, the other end of capacitor 13 is divided into three paths and is respectively connected to the other end of resistor 18, one end of resistor 19 and pin 13 of the op amp chip, the other end of resistor 20, the other end of capacitor 18, the other end of capacitor 14 and the other end of resistor 19 are grounded.

[0012] The human-computer interaction knob module includes a knob encoder, a resistor, and a capacitor. Interface one of the human-computer interaction knob module is divided into three paths, which are respectively connected to one end of resistor 10, one end of capacitor 11, and A1 pin of the knob encoder. Interface two of the human-computer interaction knob module is divided into three paths, which are respectively connected to one end of resistor 11, one end of capacitor 12, and B1 pin of the knob encoder. Interface three of the human-computer interaction knob module is connected to D1 pin of the knob encoder. The other end of resistor 10 is connected to the 5V power supply terminal, the other end of resistor 11 is connected to the 5V power supply terminal, the other end of capacitor 11, the other end of capacitor 12, C1 pin, E1 pin, MH1 pin, and MH2 pin of the knob encoder are grounded.

[0013] The model of the main control chip is STM32F103, the model of the display chip is LCD1602, the model of the power inverter chip is ICL7660, the model of the voltage regulator chip is TL431, the model of the op amp chip is TL074CDT, and the model of the knob encoder is EC11E152U402.

[0014] The human-computer interaction button module includes a button, a resistor, and a capacitor. The interface of the human-computer interaction button module is divided into three paths, which are respectively connected to one end of resistor 14, one end of capacitor 15, and one end of button 1. The other end of resistor 14 is connected to the 5V power supply end, and the other end of capacitor 15 and the other end of button 1 are grounded. The interface of the human-computer interaction button module is divided into three paths, which are respectively connected to one end of resistor 15, one end of capacitor 16, and one end of button 2. The other end of resistor 15 is connected to the 5V power supply end, and the other end of capacitor 16 and the other end of button 2 are grounded. The interface of the human-computer interaction button module is divided into three paths, which are respectively connected to one end of resistor 16, one end of capacitor 17, and one end of button 3. The other end of resistor 16 is connected to the 5V power supply end, and the other end of capacitor 17 and the other end of button 3 are grounded.

[0015] Compared with the existing technology, the present invention adopts a modular design to realize the acquisition and display of low-frequency signal waveforms, and is also convenient for subsequent debugging, maintenance, and expansion and upgrading; the power supply voltage is 5V and 2.5V, the power consumption is small, it is separated from the mains operation, and the power supply transformer circuit is omitted. Combined with the simple connection between the modules, it lays the foundation for reducing the size and weight of the oscilloscope. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a circuit diagram of the utility model.

[0017] Figure 2 This is a circuit diagram of the control module of the utility model.

[0018] Figure 3 This is the circuit diagram of the power supply communication module of the utility model.

[0019] Figure 4 This is a circuit diagram of the power management module 1 of the utility model.

[0020] Figure 5 This is the circuit diagram of the power management module 2 of the utility model.

[0021] Figure 6 This is the circuit diagram of the pre-sampling module of the utility model.

[0022] Figure 7 This is the circuit diagram of the bias op amp module of the utility model.

[0023] Figure 8 This is the circuit diagram of the human-computer interaction knob module of the utility model.

[0024] Figure 9 This is a circuit diagram of the human-computer interaction key module of the utility model. DETAILED DESCRIPTION

[0025] The present invention will now be further described with reference to the accompanying drawings.

[0026] See also Figure 1 The utility model is a circuit of a portable oscilloscope, including a control module, a power management module, a pre-sampling module, a bias op amp module, a human-computer interaction knob module, a human-computer interaction button module, and a communication power supply module. The 5V interface of the communication power supply module 6 is divided into three paths and respectively connected to the +5V interface of the power management module 1 21, the +5V interface of the power management module 2 22, and the +5V interface of the bias op amp module 4. The -5V interface of the power management module 1 21 is connected to the -5V interface of the bias op amp module 4, and the +2.5V interface of the power management module 2 22 is connected to the bias op amp. The +2.5V interface of module 4 is connected, the output interface of the pre-sampling module 3 is connected to the input interface of the bias op amp module 4, the ADC output interface of the bias op amp module 4 is connected to the ADC sampling interface of the control module 1, the human-computer interaction interface 1, the human-computer interaction interface 2, and the human-computer interaction interface 3 of the control module 1 are respectively connected to the interface 1, interface 2, and interface 3 of the human-computer interaction knob module 51, and the human-computer interaction interface 4, the human-computer interaction interface 5, and the human-computer interaction interface 6 of the control module 1 are respectively connected to the interface 1, interface 2, and interface 3 of the human-computer interaction button module 52.

[0027] See also Figure 2The control module 1 includes a main control chip, a display chip, an indicator light, a resistor, a sliding rheostat, a capacitor, a crystal oscillator, and terminals. The ADC sampling interface, human-computer interaction interface 1, human-computer interaction interface 2, human-computer interaction interface 3, human-computer interaction interface 4, human-computer interaction interface 5, and human-computer interaction interface 6 of the control module 1 are respectively connected to pins 35, 97, 98, 1, 60, 61, and 62 of the main control chip U1A. Pin 36 of the main control chip U1A is divided into two paths and connected to one end of resistor R4 and one end of resistor R5 respectively. The other end of resistor R4 is connected to the 5V power supply terminal. Pin 24 of the main control chip U1A is connected in series with resistor R1. The anode of indicator light D1 is connected, the anode of indicator light D2 is connected to the 5V power supply terminal, the cathode of indicator light D2 is connected to one end of resistor R2, pins 15 and 16 of the main control chip U1A are connected to pins 3 and 2 of terminal one respectively, pin 1 of terminal one is connected to the VCC power supply terminal, pin 81 of the main control chip U1A is divided into two ways and connected to pin 7 of the display chip U2 and pin 2 of terminal two respectively, pin 82 of the main control chip U1A is divided into two ways and connected to pin 8 of the display chip U2 and pin 3 of terminal two respectively, pin 83 of the main control chip U1A is divided into two ways and connected to pin 9 of the display chip U2 and pin 4 of terminal two respectively, the main control Pin 84 of chip U1A is divided into two ways and connected to pin 10 of display chip U2 and pin 5 of terminal 2 respectively. Pin 85 of main control chip U1A is divided into two ways and connected to pin 11 of display chip U2 and pin 6 of terminal 2 respectively. Pin 86 of main control chip U1A is divided into two ways and connected to pin 12 of display chip U2 and pin 7 of terminal 2 respectively. Pin 87 of main control chip U1A is divided into two ways and connected to pin 13 of display chip U2 and pin 8 of terminal 2 respectively. Pin 88 of main control chip U1A is divided into two ways and connected to pin 14 of display chip U2 and pin 9 of terminal 2 respectively. Pins 55, 56 and 57 of main control chip U1A are connected to pin 11 of display chip U2 and pin 6 of terminal 2 respectively. The pins are connected to pins 4, 5, and 6 of the display chip U2 in sequence. Pin 1 of terminal 2 is divided into four paths and connected to the VCC power supply terminal, one end of the sliding rheostat RP1, pins 2 and 15 of the display chip U2 respectively. Pin 3 of the display chip U2 is connected to the sliding end of the sliding rheostat RP1. Pin 12 of the main control chip U1A is divided into two paths and connected to one end of the crystal oscillator Y1 and one end of the capacitor C7 respectively. Pin 13 of the main control chip U1A is divided into two paths and connected to the other end of the crystal oscillator Y1 and one end of the capacitor C8 respectively. Pin 14 of the main control chip U1A is divided into two paths and connected to one end of the resistor R9 and one end of the capacitor C9 respectively. The other end of the resistor R9 is connected to 3.Connect the 3V power supply terminal, the other end of the sliding rheostat RP1, the other end of resistor R2, the other end of resistor R5, the cathode of indicator light D1, pin 4 of terminal 1, pins 1 and 16 of display chip U2, pin 94 of main control chip U1A, the other end of capacitor C7, the other end of capacitor C8, and the other end of capacitor C9 to ground.

[0028] In control module 1, main control chip U1A is responsible for ADC data sampling and controlling human-computer interaction. Main control chip U1A is an STM32F103 with rich on-chip resources, which enables parameter calculation at a low cost. Display chip U2 is responsible for interface display and waveform display. Display chip U2 is an LCD1602, which can be configured with a smaller display screen, eliminating the need for vacuum tubes and a fluorescent screen, resulting in a compact and lightweight design. Indicator light D1 and indicator light D2 respectively display the ADC operating status and power supply status. Terminal 1 TTL1 is a debug terminal for subsequent debugging. Terminal 2 R3 is a 10kΩ resistor used for pull-up. This pin is high when main control chip U1A is not sending a signal. Sliding rheostat RP1 adjusts the V0 voltage, thereby changing the display contrast. The contrast is lowest when connected to power. Crystal oscillator Y1 generates a reference clock signal.

[0029] See also Figure 3 Communication power supply module 6 includes a Type C chip and a toggle switch. The 5V interface of communication power supply module 6 is connected to pin 1 of toggle switch S2. Pin 2 of toggle switch S2 is connected in three ways to the VCC power supply terminal, pins A4 and A9 of Type C chip J1, respectively. Pins 0, A1, and A12 of Type C chip J1 are connected to ground. The model of Type C chip J1 is TYPE-CF-12 / 16P-OT0.8-L6.5, and the model of toggle switch S2 is SS-12D02-VG4.

[0030] The TYPEC chip J1 is connected to the host computer and transmits the bus network data to the host computer for communication. At the same time, the communication power supply module 6 provides +5V DC voltage to other parts of the circuit through the 5V interface.

[0031] See also Figure 4The power management module 21 includes a power flip chip, an electrolytic capacitor, and an inductor. The +5V interface of the power management module 21 is divided into three paths, which are respectively connected to pin 8 of the power flip chip IC1, the positive electrode of the electrolytic capacitor C2, and one end of the inductor L1. The other end of the inductor L1 is connected to the 5V power supply end. The -5V interface of the power management module 21 is divided into two paths, which are respectively connected to pin 5 of the power flip chip IC1 and the negative electrode of the electrolytic capacitor C3. Pin 2 of the power flip chip IC1 is connected to the positive electrode of the electrolytic capacitor C1, pin 4 of the power flip chip IC1 is connected to the negative electrode of the electrolytic capacitor C1, the negative electrode of the electrolytic capacitor C2, the positive electrode of the electrolytic capacitor C3, and pin 3 of the power flip chip IC1 are grounded.

[0032] The power flip chip IC1 is of model ICL7660. The power flip chip IC1 converts a +5V DC voltage into a -5V DC voltage and outputs it to the bias operational amplifier module 4.

[0033] See also Figure 5 The power management module 22 includes a voltage regulator chip, a resistor, and a capacitor. The +5V interface of the power management module 22 is connected to one end of the resistor R12. The +2.5V interface of the power management module 22 is divided into four paths and respectively connected to the other end of the resistor R12, one end of the capacitor C10, and pins 1 and 2 of the voltage regulator chip IC2. Pin 3 of the voltage regulator chip IC2 and the other end of the capacitor C10 are grounded.

[0034] The voltage regulator chip IC2 is a TL431 chip. The voltage regulator chip IC2 reduces the +5V DC voltage to a +2.5V DC voltage and outputs it as a bias voltage to the bias operational amplifier module 4.

[0035] Since the ADC peripheral voltage measurement range of the microcontroller is up to 5V, and the actual measurement needs to be up to 20V positive and negative AC voltage, the original signal needs to be attenuated and biased in the circuit design.

[0036] See also Figure 6The pre-sampling module 3 includes a toggle switch, a capacitor, a resistor, a diode, and a terminal. The output interface of the pre-sampling module 3 is divided into three paths and is respectively connected to the cathode of the diode D3, the anode of the diode D4, and one end of the resistor R7. The anode of the diode D3 is connected to the cathode of the diode D5, the cathode of the diode D4 is connected to the anode of the diode D6, and the other end of the resistor R7 is divided into four paths and is respectively connected to one end of the resistor R6, one end of the resistor R8, one end of the capacitor C5, and one end of the resistor R7. One end of capacitor C6 is connected. The other end of resistor R6 is connected in three ways to the other end of capacitor C5, one end of capacitor C4, and pin 3 of slide switch S1. The other end of capacitor C4 is connected to pin 1 of slide switch S1. Pin 2 of slide switch S1 is connected to pin 1 of terminal 3. The anode of diode D5, the cathode of diode D6, the other end of resistor R8, the other end of capacitor C6, and pins 2 and 3 of terminal 3 are grounded. The model of slide switch S1 is SS-12D02-VG4.

[0037] Pre-sampling module 3 primarily processes DC and AC signals. External signals are input through pin 2 (COM) of toggle switch S1 and are selectively fed into either pin 3 (NO) or pin 1 (NC) via toggle switch S1. When toggle switch S1 is set to pin 3 (NO), DC coupling mode is established. The signal passes through resistors R6 and R8 before being grounded, effectively dividing the DC signal voltage. When toggle switch S1 is set to pin 1 (NC), AC coupling mode is established. The signal is filtered by capacitor C4 before being divided by an RC circuit consisting of capacitors C5, C6, resistors R6, and R8 in parallel. The signal then passes through a clamping circuit consisting of diodes D3, D4, D5, and D6 before being output to bias amplifier module 4. Terminal 3 is the output port for collecting external signals.

[0038] See also Figure 7The bias op amp module 4 includes an op amp chip, a resistor, and a capacitor. The input interface of the bias op amp module 4 is connected to pin 3 of the op amp chip IC3. The +5V interface of the bias op amp module 4 is divided into three paths and respectively connected to one end of the resistor R17, pin 1, and pin 5 of the op amp chip IC3. The -5V interface of the bias op amp module 4 is connected to pin 11 of the op amp chip IC3. The +2.5V interface of the bias op amp module 4 is connected to one end of the resistor R21. The ADC output interface of the bias op amp module 4 is divided into two paths and respectively connected to one end of the resistor R13 and one end of the capacitor C14. The other end of the resistor R17 is divided into two paths and respectively connected to one end of the resistor R20 and pin 2 of the op amp chip IC3. Pin 4 of the op amp chip IC3 It is connected to one end of capacitor 18 C18, the other end of resistor 21 R21 is divided into two paths and is respectively connected to one end of resistor 22 R22 and pin 12 of op amp chip IC3, the other end of resistor 22 R22 is divided into two paths and is respectively connected to pin 6 and pin 7 of op amp chip IC3, the other end of resistor 13 R13 is divided into three paths and is respectively connected to one end of capacitor 13 C13, one end of resistor 18 R18 and pin 14 of op amp chip IC3, the other end of capacitor 13 C13 is divided into three paths and is respectively connected to the other end of resistor 18 R18, one end of resistor 19 R19 and pin 13 of op amp chip IC3, the other end of resistor 20 R20, the other end of capacitor 18 C18, the other end of capacitor 14 C14 and the other end of resistor 19 R19 are grounded.

[0039] The model of the operational amplifier chip IC3 is TL074CDT. The operational amplifier chip IC3 performs operational amplification on the signal obtained from the pre-sampling module 3 and outputs the signal to the main control chip U1A of the control module 1 .

[0040] See also Figure 8 The human-computer interaction knob module 51 includes a knob encoder, a resistor, and a capacitor. Interface one of the human-computer interaction knob module 51 is divided into three paths, which are respectively connected to one end of resistor R10, one end of capacitor C11, and A1 pin of knob encoder S3. Interface two of the human-computer interaction knob module 51 is divided into three paths, which are respectively connected to one end of resistor R11, one end of capacitor C12, and B1 pin of knob encoder S3. Interface three of the human-computer interaction knob module 51 is connected to D1 pin of knob encoder S3. The other end of resistor R10 is connected to 5V power supply terminal, the other end of resistor R11 is connected to 5V power supply terminal, the other end of capacitor C11, the other end of capacitor C12, C1 pin, E1 pin, MH1 pin, and MH2 pin of knob encoder S3 are grounded.

[0041] The model of the knob encoder S3 is EC11E152U402, which supports single click, rotation, and press-to-rotate. The human-computer interaction knob module 51 sends the action signal of the user operating the knob to the main control chip U1A of the control module 1.

[0042] See also Figure 9 The human-computer interaction button module 52 includes a button, a resistor, and a capacitor. The interface of the human-computer interaction button module 52 is divided into three paths, which are respectively connected to one end of the resistor 14 R14, one end of the capacitor 15 C15, and one end of the button 1 S4. The other end of the resistor 14 R14 is connected to the 5V power supply end, and the other end of the capacitor 15 C15 and the other end of the button 1 S4 are grounded. The interface of the human-computer interaction button module 52 is divided into three paths, which are respectively connected to one end of the resistor 15 R15, one end of the capacitor 16 C16, and one end of the button 2 S5. The other end of the resistor 15 R15 is connected to the 5V power supply end, and the other end of the capacitor 16 C16 and the other end of the button 2 S5 are grounded. The interface of the human-computer interaction button module 52 is divided into three paths, which are respectively connected to one end of the resistor 16 R16, one end of the capacitor 17 C17, and one end of the button 3 S6. The other end of the resistor 16 R16 is connected to the 5V power supply end, and the other end of the capacitor 17 C17 and the other end of the button 3 S6 are grounded.

[0043] Button 1 S4 , button 2 S5 , and button 3 S6 include reset, set, and switch buttons. The human-computer interaction button module 52 sends action signals of user-operated buttons to the main control chip U1A of the control module 1 .

[0044] The utility model supports measuring AC sine and triangle waves with a frequency of 1-10kHz and an amplitude of 1-10V, supports rising edge triggering and falling edge triggering, and supports waveform and frequency display.

[0045] This utility model adopts a modular design to realize the acquisition and display of low-frequency signal waveforms, and is also convenient for subsequent debugging, maintenance, and expansion and upgrading; the power supply voltage is 5V and 2.5V, the power consumption is small, it is separated from the mains operation, and the power supply transformer circuit is eliminated. Combined with the simple connection between the modules, it lays the foundation for reducing the size and weight of the oscilloscope.

[0046] The oscilloscope adopting the circuit of the utility model has the advantages of small size, light weight, portability, convenience in use and low cost.

Claims

1. A portable oscilloscope circuit, comprising a control module, a power management module, a pre-sampling module, a bias amplifier module, a human-computer interaction knob module, a human-computer interaction button module, and a communication power supply module, characterized in that: The 5V interface of the communication power supply module (6) is divided into three paths and connected to the +5V interface of the power management module 1 (21), the +5V interface of the power management module 2 (22), and the +5V interface of the bias amplifier module (4). The -5V interface of the power management module 1 (21) is connected to the -5V interface of the bias amplifier module (4). The +2.5V interface of the power management module 2 (22) is connected to the +2.5V interface of the bias amplifier module (4). The output interface of the pre-sampling module (3) is connected to the bias amplifier module ( 4), the ADC output interface of the bias operational amplifier module (4) is connected to the ADC sampling interface of the control module (1), the human-computer interaction interface 1, the human-computer interaction interface 2, and the human-computer interaction interface 3 of the control module (1) are connected to the interface 1, interface 2, and interface 3 of the human-computer interaction knob module (51) in sequence, respectively, and the human-computer interaction interface 4, the human-computer interaction interface 5, and the human-computer interaction interface 6 of the control module (1) are connected to the interface 1, interface 2, and interface 3 of the human-computer interaction button module (52) in sequence.

2. The circuit of a portable oscilloscope according to claim 1, wherein: The control module (1) includes a main control chip, a display chip, an indicator light, a resistor, a sliding rheostat, a capacitor, a crystal oscillator, and a terminal. The ADC sampling interface, the human-computer interaction interface 1, the human-computer interaction interface 2, the human-computer interaction interface 3, the human-computer interaction interface 4, the human-computer interaction interface 5, and the human-computer interaction interface 6 of the control module (1) are respectively connected to pins 35, 97, 98, 1, 60, 61, and 62 of the main control chip (U1A). Pin 36 of the main control chip (U1A) is divided into two paths and connected to one end of resistor 4 (R4) and one end of resistor 5 (R5). The other end of resistor 4 (R4) is connected to the 5V power supply terminal. Pin 24 of the main control chip (U1A) is connected in series. After connecting resistor 1 (R1), it is connected to the anode of indicator light 1 (D1), the anode of indicator light 2 (D2) is connected to the 5V power supply terminal, the cathode of indicator light 2 (D2) is connected to one end of resistor 2 (R2), pins 15 and 16 of the main control chip (U1A) are connected to pins 3 and 2 of terminal 1 respectively, pin 1 of terminal 1 is connected to the VCC power supply terminal, pin 81 of the main control chip (U1A) is divided into two ways and connected to pin 7 of the display chip (U2) and pin 2 of terminal 2 respectively, pin 82 of the main control chip (U1A) is divided into two ways and connected to pin 8 of the display chip (U2) and pin 3 of terminal 2 respectively, pin 83 of the main control chip (U1A) is divided into two ways and connected to pin 10 of the display chip (U2) and pin 11 of terminal 2 respectively. The main control chip (U1A) is connected to pin 9 of the display chip (U2) and pin 4 of terminal 2. The main control chip (U1A) has two pins, No. 84, which are connected to pin 10 of the display chip (U2) and pin 5 of terminal 2 respectively. The main control chip (U1A) has two pins, No. 85, which are connected to pin 11 of the display chip (U2) and pin 6 of terminal 2 respectively. The main control chip (U1A) has two pins, No. 86, which are connected to pin 12 of the display chip (U2) and pin 7 of terminal 2 respectively. The main control chip (U1A) has two pins, No. 87, which are connected to pin 13 of the display chip (U2) and pin 8 of terminal 2 respectively. The main control chip (U1A) has two pins, No. 88, which are connected to pin 14 of the display chip (U2) and pin 15 of terminal 2 respectively. Pin 9 of terminal 2 is connected, pins 55, 56, and 57 of the main control chip (U1A) are connected to pins 4, 5, and 6 of the display chip (U2) in sequence, pin 1 of terminal 2 is divided into four paths and connected to the VCC power supply end, one end of the sliding rheostat (RP1), pin 2 and pin 15 of the display chip (U2), pin 3 of the display chip (U2) is connected to the sliding end of the sliding rheostat (RP1), pin 12 of the main control chip (U1A) is divided into two paths and connected to one end of the crystal oscillator (Y1) and one end of capacitor seven (C7), pin 13 of the main control chip (U1A) is divided into two paths and connected to the other end of the crystal oscillator (Y1) and one end of capacitor eight (C8),Pin 14 of the main control chip (U1A) is connected in two ways to one end of resistor 9 (R9) and one end of capacitor 9 (C9). The other end of resistor 9 (R9) is connected to the 3.3V power supply terminal. The other end of the sliding rheostat (RP1), the other end of resistor 2 (R2), the other end of resistor 5 (R5), the cathode of indicator light 1 (D1), pin 4 of terminal 1, pin 1 and pin 16 of the display chip (U2), pin 94 of the main control chip (U1A), the other end of capacitor 7 (C7), the other end of capacitor 8 (C8), and the other end of capacitor 9 (C9) are grounded.

3. The circuit of a portable oscilloscope according to claim 1, wherein: The communication power supply module (6) includes a TYPEC chip and a toggle switch. The 5V interface of the communication power supply module (6) is connected to pin 1 of the second toggle switch (S2). Pin 2 of the second toggle switch (S2) is connected in three ways to the VCC power supply terminal, pin A4 and pin A9 of the TYPEC chip (J1), respectively. Pin 0, pin A1 and pin A12 of the TYPEC chip (J1) are grounded.

4. The circuit of a portable oscilloscope according to claim 1, wherein: The power management module 1 (21) includes a power reversal chip, an electrolytic capacitor, and an inductor. The +5V interface of the power management module 1 (21) is divided into three paths and is respectively connected to the No. 8 pin of the power reversal chip (IC1), the positive electrode of the electrolytic capacitor 2 (C2), and one end of the inductor 1 (L1). The other end of the inductor 1 (L1) is connected to the 5V power supply end. The -5V interface of the power management module 1 (21) is divided into two paths and is respectively connected to the No. 5 pin of the power reversal chip (IC1) and the negative electrode of the electrolytic capacitor 3 (C3). The No. 2 pin of the power reversal chip (IC1) is connected to the positive electrode of the electrolytic capacitor 1 (C1), and the No. 4 pin of the power reversal chip (IC1) is connected to the The negative electrode of electrolytic capacitor 1 (C1) is connected, the negative electrode of electrolytic capacitor 2 (C2), the positive electrode of electrolytic capacitor 3 (C3), and pin 3 of power inversion chip (IC1) are grounded; the power management module 2 (22) includes a voltage stabilizing chip, a resistor, and a capacitor. The +5V interface of power management module 2 (22) is connected to one end of resistor 12 (R12), and the +2.5V interface of power management module 2 (22) is divided into four paths and respectively connected to the other end of resistor 12 (R12), one end of capacitor 10 (C10), pin 1 and pin 2 of voltage stabilizing chip (IC2), and pin 3 of voltage stabilizing chip (IC2) and the other end of capacitor 10 (C10) are grounded.

5. The circuit of a portable oscilloscope according to claim 1, wherein: The pre-sampling module (3) includes a toggle switch, a capacitor, a resistor, a diode, and a terminal. The output interface of the pre-sampling module (3) is divided into three paths and connected to the cathode of diode three (D3), the anode of diode four (D4), and one end of resistor seven (R7). The anode of diode three (D3) is connected to the cathode of diode five (D5), the cathode of diode four (D4) is connected to the anode of diode six (D6), and the other end of resistor seven (R7) is divided into four paths and connected to one end of resistor six (R6), one end of resistor eight (R8), and one end of capacitor five (C5). , one end of capacitor six (C6) is connected, the other end of resistor six (R6) is divided into three paths and respectively connected to the other end of capacitor five (C5), one end of capacitor four (C4), and pin 3 of slide switch one (S1), the other end of capacitor four (C4) is connected to pin 1 of slide switch one (S1), pin 2 of slide switch one (S1) is connected to pin 1 of terminal three, the anode of diode five (D5), the cathode of diode six (D6), the other end of resistor eight (R8), the other end of capacitor six (C6), pin 2 of terminal three, and pin 3 are grounded.

6. A circuit of a portable oscilloscope according to claim 3 or 5, characterized in that: The model of the TYPEC chip (J1) is TYPE-CF-12 / 16P-OT0.8-L6.5, and the models of the toggle switch 1 (S1) and toggle switch 2 (S2) are SS-12D02-VG4.

7. The circuit of a portable oscilloscope according to claim 1, wherein: The bias op amp module (4) includes an op amp chip, a resistor, and a capacitor. The input interface of the bias op amp module (4) is connected to pin 3 of the op amp chip (IC3). The +5V interface of the bias op amp module (4) is divided into three paths and connected to one end of resistor seventeen (R17), pin 1, and pin 5 of the op amp chip (IC3). The -5V interface of the bias op amp module (4) is connected to pin 11 of the op amp chip (IC3). The +2.5V interface of the bias op amp module (4) is connected to one end of resistor twenty-one (R21). The ADC output interface of the bias op amp module (4) is divided into two paths and connected to one end of resistor thirteen (R13) and one end of capacitor fourteen (C14). The other end of resistor seventeen (R17) is divided into two paths and connected to one end of resistor twenty (R20) and pin 2 of the op amp chip (IC3). Pin 4 of the op amp chip (IC3) is connected to the ADC output interface of the bias op amp module (4). Connected to one end of capacitor 18 (C18), the other end of resistor 21 (R21) is divided into two paths and respectively connected to one end of resistor 22 (R22) and pin 12 of op amp chip (IC3), the other end of resistor 22 (R22) is divided into two paths and respectively connected to pins 6 and 7 of op amp chip (IC3), the other end of resistor 13 (R13) is divided into three paths and respectively connected to one end of capacitor 13 (C13), one end of resistor 18 (R18) and pin 14 of op amp chip (IC3), the other end of capacitor 13 (C13) is divided into three paths and respectively connected to the other end of resistor 18 (R18), one end of resistor 19 (R19) and pin 13 of op amp chip (IC3), the other end of resistor 20 (R20), the other end of capacitor 18 (C18), the other end of capacitor 14 (C14) and the other end of resistor 19 (R19) are grounded.

8. The circuit of a portable oscilloscope according to claim 1, wherein: The human-computer interaction knob module (51) includes a knob encoder, a resistor, and a capacitor. Interface one of the human-computer interaction knob module (51) is divided into three paths and is respectively connected to one end of resistor ten (R10), one end of capacitor eleven (C11), and A1 pin of the knob encoder (S3). Interface two of the human-computer interaction knob module (51) is divided into three paths and is respectively connected to one end of resistor eleven (R11), one end of capacitor twelve (C12), and B1 pin of the knob encoder (S3). Interface three of the human-computer interaction knob module (51) is connected to D1 pin of the knob encoder (S3). The other end of resistor ten (R10) is connected to a 5V power supply terminal. The other end of resistor eleven (R11) is connected to a 5V power supply terminal. The other end of capacitor eleven (C11), the other end of capacitor twelve (C12), C1 pin, E1 pin, MH1 pin, and MH2 pin of the knob encoder (S3) are grounded.

9. A circuit of a portable oscilloscope according to claim 2, 4 or 8, characterized in that: The model of the main control chip (U1A) is STM32F103, the model of the display chip (U2) is LCD1602, the model of the power inverter chip (IC1) is ICL7660, the model of the voltage regulator chip (IC2) is TL431, the model of the op amp chip (IC3) is TL074CDT, and the model of the knob encoder (S3) is EC11E152U402.

10. The circuit of a portable oscilloscope according to claim 1, characterized in that: The human-computer interaction key module (52) includes a key, a resistor, and a capacitor. The interface of the human-computer interaction key module (52) is divided into three paths, which are respectively connected to one end of resistor 14 (R14), one end of capacitor 15 (C15), and one end of key 1 (S4). The other end of resistor 14 (R14) is connected to the 5V power supply end, and the other end of capacitor 15 (C15) and the other end of key 1 (S4) are grounded. The interface of the human-computer interaction key module (52) is divided into three paths, which are respectively connected to one end of resistor 15 (R15), capacitor 16 (C1 6) and one end of button 2 (S5), the other end of resistor 15 (R15) is connected to the 5V power supply terminal, the other end of capacitor 16 (C16) and the other end of button 2 (S5) are grounded, the three-way interface of the human-computer interaction button module (52) is respectively connected to one end of resistor 16 (R16), one end of capacitor 17 (C17) and one end of button 3 (S6), the other end of resistor 16 (R16) is connected to the 5V power supply terminal, and the other end of capacitor 17 (C17) and the other end of button 3 (S6) are grounded.

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