Handheld digital display direct current signal generator

Abstract

The utility model relates to the technical field of signal generators, and provides a handheld digital display direct current signal generator, which comprises a power supply unit, a high-voltage output unit, a voltage regulation unit, a processor and a display unit, the power supply unit is used for providing working power for the high-voltage output unit, the voltage regulation unit, the processor and the display unit; the high-voltage output unit is connected with the processor and is used for outputting a direct-current high-voltage signal; the voltage regulation unit is connected with the processor, and the processor is configured to control a direct-current high-voltage signal output by the high-voltage output unit according to a signal of the voltage regulation unit; and the display unit is connected with the processor and is used for displaying the direct-current high-voltage signal output by the high-voltage output unit. According to the technical scheme, the problem that the direct-current signal generator cannot accurately judge the performance of the direct-current electroscope in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of signal generators, and in particular to a handheld digital display direct current signal generator. Background Art

[0002] A DC tester is a portable device used to detect whether there is electrical energy in a DC circuit. Before using a DC tester, it needs to be inspected, that is, the high-voltage signal output by the DC signal generator ensures that it can send out a clear sound and light alarm signal. The national standard stipulates that the starting voltage of a DC tester is qualified when it starts between 10% and 45% of the rated voltage. Therefore, the existing DC signal generator can only output two voltages, one is 10% of the rated voltage, and the other is 45% of the rated voltage. The DC tester is tested by the elimination method to see if it is qualified. This method can only know that the starting voltage of the DC tester is within the specified range, but it is not sure what the specific starting voltage is. When the DC tester does not send out a clear sound and light alarm signal, it is impossible to judge whether the DC circuit has less than 10% electricity or no electricity, and thus it is impossible to make an accurate judgment on the performance of the DC tester. Utility Model Content

[0003] The utility model provides a handheld digital display DC signal generator, which solves the problem in the related art that the DC signal generator cannot make an accurate judgment on the performance of the DC tester.

[0004] The technical solution of the utility model is as follows:

[0005] A handheld digital display DC signal generator, including a power supply unit, a high voltage output unit, a voltage regulating unit, a processor and a display unit;

[0006] The power supply unit is used to provide working power for the high voltage output unit, the voltage regulating unit, the processor and the display unit;

[0007] The high-voltage output unit is connected to the processor, and the high-voltage output unit is used to output a DC high-voltage signal;

[0008] The voltage regulating unit is connected to the processor, and the processor is configured to control the DC high voltage signal output by the high voltage output unit according to the signal of the voltage regulating unit;

[0009] The display unit is connected to the processor, and is used to display the DC high voltage signal output by the high voltage output unit.

[0010] Furthermore, the voltage regulating unit in the utility model includes a first key circuit, a second key circuit and a third key circuit;

[0011] The first key circuit, the second key circuit and the third key circuit are all connected to the processor.

[0012] Furthermore, the high-voltage output unit in the utility model includes a variable resistor RP1, a capacitor C1, a switch tube Q1, a transformer T1, an inductor L1, a switch tube Q2, a capacitor C3 and a resistor R3;

[0013] The first end of the variable resistor RP1 is connected to the VCC power supply, the second end of the variable resistor RP1 is grounded, the sliding end of the variable resistor RP1 is connected to the first input end of the transformer T1 through the capacitor C1, the sliding end of the variable resistor RP1 is connected to the first end of the switch tube Q1, the control end of the switch tube Q1 is used to receive a PWM control signal, the second end of the switch tube Q1 is grounded, the second input end of the transformer T1 is connected to the third input end of the transformer T1, and the fourth input end of the transformer T1 is grounded;

[0014] The first output end of the transformer T1 is connected to the first end of the inductor L1, the second output end of the transformer T1 is grounded, the second end of the inductor L1 is connected to the first end of the switch tube Q2, the control end of the switch tube Q2 is connected to the processor, the second end of the switch tube Q2 is grounded, the second end of the inductor L1 is grounded through the capacitor C3, the second end of the inductor L1 serves as the first output end of the high-voltage output unit, the first end of the resistor R3 is grounded, and the second end of the resistor R3 serves as the second output end of the high-voltage output unit.

[0015] Furthermore, the high voltage output unit in the present utility model further includes a resistor R6, a resistor R4, an amplifier U1, an optical coupler U4, a resistor R9, a capacitor C6 and a controller U3;

[0016] The first end of the resistor R6 is connected to the first output end of the transformer T1, the second end of the resistor R6 is grounded through the resistor R4, the second end of the resistor R6 is connected to the non-inverting input end of the amplifier U1, the output end of the amplifier U1 is connected to the inverting input end of the amplifier U1, the output end of the amplifier U1 is connected to the first input end of the optocoupler U4, the second input end of the optocoupler U4 is grounded, the first output end of the optocoupler U4 is connected to the discharge end of the controller U3, the second output end of the optocoupler U4 is grounded through the capacitor C6, the second output end of the optocoupler U4 is connected to the threshold input end of the controller U3, the threshold input end of the controller U3 is connected to the trigger input end of the controller U3, the discharge end of the controller U3 is connected to the VCC power supply through the resistor R9, and the output end of the controller U3 is connected to the control end of the switch tube Q1.

[0017] Furthermore, the high voltage output unit in the present utility model further includes a resistor R7, a resistor R8 and an amplifier U2;

[0018] The first end of the resistor R7 is connected to the second end of the resistor R3, the second end of the resistor R7 is grounded through the resistor R8, the second end of the resistor R7 is connected to the non-inverting input end of the amplifier U2, the output end of the amplifier U2 is connected to the inverting input end of the amplifier U2, and the output end of the amplifier U2 is connected to the processor.

[0019] Furthermore, the power supply unit in the utility model includes a button K1, a first end of the button K1 is connected to a battery, and a second end of the button K1 is used to output a VCC power supply.

[0020] Furthermore, the power supply unit in the utility model further includes a resistor R13, a resistor R14, a switch tube Q3, a light emitting diode LED1 and a switch tube Q4;

[0021] The first end of the resistor R13 is connected to the second end of the button K1, the second end of the resistor R13 is grounded through the resistor R14, the second end of the resistor R13 is connected to the control end of the switch tube Q3, the first end of the switch tube Q3 is connected to the second end of the button K1, the second end of the switch tube Q3 is connected to the anode of the light-emitting diode LED1, the cathode of the light-emitting diode LED1 is grounded, the second end of the switch tube Q3 is connected to the control end of the switch tube Q4, the first end of the switch tube Q4 is connected to the second end of the button K1, and the second end of the switch tube Q4 is used to output the VCC power supply.

[0022] The working principle and beneficial effects of the utility model are:

[0023] In the utility model, the voltage is increased to the required voltage by the high-voltage output unit and then output to the DC tester. The DC tester is detected to have sound and light alarms according to different voltage values ​​to determine whether the DC tester is qualified. The output voltage and current will be displayed on the LCD screen, and the output voltage can be manually adjusted by buttons. The utility model can measure the specific starting voltage of the DC tester, providing important judgments for operators so that operators can take corresponding safety precautions, thereby solving the problem in the related art that the DC signal generator cannot make accurate judgments on the performance of the DC tester. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] Figure 1 This is a structural block diagram of the handheld digital display DC signal generator in the utility model;

[0026] Figure 2 It is a circuit diagram of the voltage regulating unit in the utility model;

[0027] Figure 3 This is a circuit diagram of a medium- and high-voltage output unit of the utility model;

[0028] Figure 4 It is a circuit diagram of the power supply unit in the utility model;

[0029] Figure 5 It is a circuit diagram of the highlight display circuit in the utility model. DETAILED DESCRIPTION

[0030] In order to enable people in the technical field to better understand the present solution, the technical solution in the embodiment of the present solution will be clearly described below in conjunction with the drawings in the embodiment of the present solution. Obviously, the described embodiment is an embodiment of a part of the present solution, not all of the embodiments. Based on the embodiments in the present solution, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present solution.

[0031] The term "including" and any other variations in the specification and claims of this solution and the above drawings mean "including but not limited to", and is intended to cover non-exclusive inclusions and is not limited to the examples listed in the text. In addition, the terms "first" and "second" are used to distinguish different objects, rather than to describe a specific order.

[0032] Example 1

[0033] like Figure 1 As shown, this embodiment proposes a handheld digital display DC signal generator, including a power supply unit, a high-voltage output unit, a voltage regulating unit, a processor and a display unit; the power supply unit is used to provide working power for the high-voltage output unit, the voltage regulating unit, the processor and the display unit; the high-voltage output unit is connected to the processor, and the high-voltage output unit is used to output a DC high-voltage signal; the voltage regulating unit is connected to the processor, and the processor is configured to control the DC high-voltage signal output by the high-voltage output unit according to the signal of the voltage regulating unit; the display unit is connected to the processor, and the display unit is used to display the DC high-voltage signal output by the high-voltage output unit.

[0034] In this embodiment, the handheld digital display DC signal generator is mainly composed of a power supply unit, a high-voltage output unit, a voltage regulating unit, a processor and a display unit. In this embodiment, a battery is used as a working power supply. The power supply unit is used to convert the voltage provided by the battery into voltages of different amplitudes to provide a suitable working power supply for the high-voltage output unit, the voltage regulating unit, the processor and the display unit.

[0035] When working, the high voltage output unit is used to output a DC high voltage signal, and the DC high voltage signal is used as the test voltage of the DC tester. The voltage regulating unit is used to adjust the size of the DC high voltage signal output by the high voltage output unit.

[0036] The voltage regulating unit comprises a first key circuit, a second key circuit and a third key circuit; the first key circuit, the second key circuit and the third key circuit are all connected to the processor.

[0037] Specifically, Figure 2 As shown, the voltage regulating unit includes a resistor R21, a button K2, a resistor R18, a button K3, a resistor R19, a button K4 and a resistor R20; the first end of the resistor R21 is connected to a 3.3V power supply, the first end of the button K2, the first end of the button K3 and the first end of the button K4 are all connected to the second end of the resistor R21, the second end of the button K2 is grounded through the resistor R18, the second end of the button K3 is grounded through the resistor R19, and the second end of the button K4 is grounded through the resistor R20.

[0038] Among them, the key K2 and the resistor R18 constitute a first key circuit, the key K3 and the resistor R19 constitute a second key circuit, and the key K4 and the resistor R20 constitute a third key circuit. The resistance values ​​of the resistors R18, R19, and R20 are all different, so when the key K2, the key K3, or the key K4 is pressed, the processor receives different electrical signals.

[0039] The first button circuit is used to increase the amplitude of the DC high voltage signal output by the high voltage output unit. When the button K2 is pressed, the processor receives the voltage signal on the resistor R18, indicating that the amplitude of the DC high voltage signal output by the high voltage output unit needs to be increased.

[0040] The second button circuit is used to reduce the amplitude of the DC high voltage signal output by the high voltage output unit. When the button K3 is pressed, the processor receives the voltage signal on the resistor R19, indicating that the amplitude of the DC high voltage signal output by the high voltage output unit needs to be reduced.

[0041] The third button circuit is for confirmation control. When the amplitude of the DC high-voltage signal output by the high-voltage output unit needs to be increased, press button K2, and then press button K4. The processor receives the voltage signal on resistor R20. At this time, the processor sends a control instruction to the high-voltage output unit. The high-voltage output unit increases the amplitude of the output DC high-voltage signal according to the control instruction issued by the processor, and the same applies when it is decreased.

[0042] The high voltage output unit is used to output DC high voltage signals of different amplitudes according to the control instructions of the processor, and the display unit is used to display the voltage and current amplitude of the DC high voltage signal finally output by the high voltage output unit.

[0043] In this embodiment, the high voltage output unit increases the voltage to the required voltage and then outputs it to the DC tester. The DC tester is detected to see if there is an audible and visual alarm according to different voltage values ​​to determine whether the DC tester is qualified. The output voltage and current will be displayed on the LCD screen, and different output voltages can be manually adjusted by pressing buttons.

[0044] like Figure 3 As shown, in this embodiment, the high-voltage output unit includes a variable resistor RP1, a capacitor C1, a switch tube Q1, a transformer T1, an inductor L1, a switch tube Q2, a capacitor C3 and a resistor R3; the first end of the variable resistor RP1 is connected to the VCC power supply, the second end of the variable resistor RP1 is grounded, the sliding end of the variable resistor RP1 is connected to the first input end of the transformer T1 through the capacitor C1, the sliding end of the variable resistor RP1 is connected to the first end of the switch tube Q1, the control end of the switch tube Q1 is used to receive a PWM control signal, the second end of the switch tube Q1 is grounded, the second input end of the transformer T1 is connected to the third input end of the transformer T1, and the fourth input end of the transformer T1 is grounded; the first output end of the transformer T1 is connected to the first end of the inductor L1, the second output end of the transformer T1 is grounded, the second end of the inductor L1 is connected to the first end of the switch tube Q2, the control end of the switch tube Q2 is connected to the processor, the second end of the switch tube Q2 is grounded, the second end of the inductor L1 is grounded through the capacitor C3, the second end of the inductor L1 serves as the first output end of the high-voltage output unit, the first end of the resistor R3 is grounded, and the second end of the resistor R3 serves as the second output end of the high-voltage output unit.

[0045] In this embodiment, the variable resistor RP1, the capacitor C1, the switch tube Q1, the transformer T1, the inductor L1, the switch tube Q2, the capacitor C3 and the resistor R3 constitute a high-voltage generating circuit. When working, the control end of the switch tube Q1 is used to receive the PWM control signal. When the PWM control signal is at a low level, the switch tube Q1 is turned off, and the VCC power supply charges the capacitor C1 after passing through the variable resistor RP1. There is no electrical signal on the primary coil of the transformer T1. Therefore, the output of the transformer T1 is 0 at this time. When the PWM control signal is at a high level, the switch tube Q1 is turned on, the capacitor C1 is discharged, and the transformer T1 is a step-up transformer. At this time, the magnetic flux of the primary coil of the transformer T1 changes, so a high-voltage signal is generated on the secondary coil of the transformer T1. The high-voltage signal on the secondary coil of the transformer T1 is converted into a DC signal output after being sorted and filtered by the diode D1 and the capacitor C2.

[0046] When the high-voltage output unit is working, the processor also sends a PWM control signal to the control end of the switch tube Q2, wherein the inductor L1, the switch tube Q2 and the capacitor C3 constitute a boost circuit. When the PWM control signal output by the processor is at a high level, the voltage output by the transformer T1 stores energy in the inductor L1. When the PWM control signal output by the processor is at a low level, the switch tube Q2 is cut off. At this time, the inductor L1 discharges as a high-voltage output unit output and charges the capacitor C3 at the same time. The boost circuit can secondary increase the voltage output by the transformer T1 to meet the needs of testing the DC tester.

[0047] When the processor receives the signal from the voltage regulating unit, the processor determines how much the voltage output by the high-voltage output unit needs to be adjusted by judging the number of times buttons K2 and K3 are pressed, and then changes the duty cycle of the output PWM control signal according to the number of times buttons K2 and K3 are pressed, thereby outputting DC high-voltage signals of different amplitudes.

[0048] like Figure 3 As shown, in this embodiment, the high-voltage output unit also includes a resistor R6, a resistor R4, an amplifier U1, an optical coupler U4, a resistor R9, a capacitor C6 and a controller U3; the first end of the resistor R6 is connected to the first output end of the transformer T1, the second end of the resistor R6 is grounded through the resistor R4, the second end of the resistor R6 is connected to the in-phase input end of the amplifier U1, the output end of the amplifier U1 is connected to the inverting input end of the amplifier U1, the output end of the amplifier U1 is connected to the first input end of the optical coupler U4, the second input end of the optical coupler U4 is grounded, the first output end of the optical coupler U4 is connected to the discharge end of the controller U3, the second output end of the optical coupler U4 is grounded through the capacitor C6, the second output end of the optical coupler U4 is connected to the threshold input end of the controller U3, the threshold input end of the controller U3 is connected to the trigger input end of the controller U3, the discharge end of the controller U3 is connected to the VCC power supply through the resistor R9, and the output end of the controller U3 is connected to the control end of the switch tube Q1.

[0049] In this embodiment, resistor R6, resistor R4, amplifier U1, optocoupler U4, resistor R9, capacitor C6 and controller U3 constitute a voltage regulation circuit, which is used to adjust the output voltage of transformer T1 to ensure that the voltage output by transformer T1 is stable and unchanged, and at the same time ensure that the DC high voltage signal output by the high voltage output unit is adjusted more stably and accurately, so as to more accurately judge the starting voltage of the DC tester.

[0050] Among them, the resistor R6 and the resistor R4 are used to detect the voltage output by the transformer T1, and the voltage on the resistor R4 is taken as the reference voltage and added to the in-phase input terminal of the amplifier U1. The amplifier U1 constitutes a follower, which is used to improve the effectiveness of signal transmission. The voltage after following is added to the first input terminal of the optocoupler U4. When the voltage output by the transformer T1 increases, the voltage on the resistor R4 increases, and the output power of the internal light-emitting diode of the optocoupler U4 increases, and the internal resistance of the phototransistor inside the optocoupler U4 decreases. In this embodiment, a 555 timer is used as the controller U3. The controller U3, the resistor R9, the capacitor C6 and the phototransistor inside the optocoupler U4 constitute an oscillation circuit. The output terminal of the controller U3 is used to output a PWM control signal. The frequency of the output PWM control signal of the controller U3 can be changed by changing the internal resistance of the phototransistor inside the optocoupler U4. When the internal resistance of the phototransistor inside the optocoupler U4 decreases, the frequency of the output PWM control signal of the controller U3 decreases, the switching frequency of the switch tube Q1 decreases, and the charging time of the capacitor C1 is shortened, thereby reducing the output voltage of the transformer T1. When the voltage output by transformer T1 decreases, the voltage on resistor R4 decreases, the frequency of the output PWM control signal of controller U3 increases, and the charging time of capacitor C1 increases, so that the output voltage of transformer T1 increases, thereby stabilizing the output voltage of transformer T1.

[0051] like Figure 3 As shown, in this embodiment, the high-voltage output unit also includes a resistor R7, a resistor R8 and an amplifier U2; the first end of the resistor R7 is connected to the second end of the resistor R3, the second end of the resistor R7 is grounded through the resistor R8, the second end of the resistor R7 is connected to the in-phase input end of the amplifier U2, the output end of the amplifier U2 is connected to the inverting input end of the amplifier U2, and the output end of the amplifier U2 is connected to the processor.

[0052] In this embodiment, the high-voltage output unit includes two output terminals, namely, an output positive pole and an output negative pole. When testing the DC tester, the DC tester is tested by connecting the two output terminals of the high-voltage output unit to the detection terminal of the DC tester. During the test, if the current output by the high-voltage output unit is too large, the components inside the DC tester may be burned. For this reason, an overcurrent protection circuit is added in this embodiment. When the output current of the high-voltage output unit is greater than the set value, the processor stops sending the PWM control signal to the control terminal of the switch tube Q2 to prevent the DC tester from being damaged due to excessive test current.

[0053] The overcurrent protection circuit is composed of resistors R7, R8 and amplifier U2. Resistors R7 and R8 form a voltage divider circuit. When the voltage output by the high-voltage output unit increases, the voltage on resistor R8 increases, and vice versa. The amplifier U1 forms a follower, which plays a role in signal isolation. The voltage after following is sent to the processor, and the processor determines whether the output current of the high-voltage output unit is normal through the voltage on resistor R8. Among them, the voltage regulator D2 plays a protective role to prevent the voltage entering the processor from being too high and burning the processor.

[0054] like Figure 4 As shown, in this embodiment, the power supply unit includes a button K1, a first end of the button K1 is connected to a battery, and a second end of the button K1 is used to output a VCC power supply.

[0055] In this embodiment, the battery is used as the power supply. When the DC tester needs to be tested, the button K1 needs to be pressed, and then the battery is connected. The handheld digital display DC signal generator is powered on and starts working. When the test is completed, the battery is disconnected.

[0056] like Figure 4 As shown, in this embodiment, the power supply unit also includes a resistor R13, a resistor R14, a switch tube Q3, a light emitting diode LED1 and a switch tube Q4; the first end of the resistor R13 is connected to the second end of the button K1, the second end of the resistor R13 is grounded through the resistor R14, the second end of the resistor R13 is connected to the control end of the switch tube Q3, the first end of the switch tube Q3 is connected to the second end of the button K1, the second end of the switch tube Q3 is connected to the anode of the light emitting diode LED1, the cathode of the light emitting diode LED1 is grounded, the second end of the switch tube Q3 is connected to the control end of the switch tube Q4, the first end of the switch tube Q4 is connected to the second end of the button K1, and the second end of the switch tube Q4 is used to output the VCC power supply.

[0057] When the battery is over-discharged, it will affect the battery life. When the battery power is lower than the set value, the battery should be disconnected to avoid over-discharge.

[0058] Therefore, an over-discharge protection circuit is added in this embodiment. The over-discharge protection circuit is composed of a resistor R13, a resistor R14, a switch tube Q3, a light-emitting diode LED1 and a switch tube Q4. When the battery power is greater than the set value, the voltage on the resistor R14 is greater than the turn-on voltage of the switch tube Q3. The switch tubes Q3 and Q4 in this embodiment are P-channel enhancement type long effect tubes, so the switch tube Q3 is cut off, the light-emitting diode LED1 is not lit, and the switch tube Q4 is turned on. At this time, when the button K1 is pressed, the battery outputs the VCC power supply through the button K1 and the switch tube Q4.

[0059] When the battery power is less than the set value, the voltage on the resistor R14 is less than the turn-on voltage of the switch tube Q3, the switch tube Q3 is turned on, a voltage is generated on the light-emitting diode LED1, the light-emitting diode LED1 emits light, the control end of the switch tube Q4 becomes a high level, and the switch tube Q4 is cut off. At this time, even if the key K1 is pressed, the battery will not supply power to the high-voltage output unit, the voltage regulating unit, the processor and the display unit. Only the light-emitting diode LED1 emits light, and the light-emitting diode LED1 can play an alarm role.

[0060] like Figure 5 As shown, this embodiment also includes a highlight display circuit, which includes a button K5, a light-emitting diode LED2 and a resistor R22. The first end of the button K5 is connected to the VCC power supply, the second end of the button K5 is connected to the anode of the light-emitting diode LED2, and the cathode of the light-emitting diode LED2 is grounded through the resistor R22.

[0061] In this embodiment, the display unit includes a display screen, and the light-emitting diode LED2 is used to light up the display screen, which is convenient for use in dim light conditions. When the button K5 is pressed, the light-emitting diode LED2 is connected to the VCC power supply, and the light-emitting diode LED2 emits light to light up the display screen.

[0062] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. Handheld digital display DC signal generator, characterized in that: It includes a power supply unit, a high voltage output unit, a voltage regulating unit, a processor and a display unit; The power supply unit is used to provide working power for the high voltage output unit, the voltage regulating unit, the processor and the display unit; The high-voltage output unit is connected to the processor, and the high-voltage output unit is used to output a DC high-voltage signal; The voltage regulating unit is connected to the processor, and the processor is configured to control the DC high voltage signal output by the high voltage output unit according to the signal of the voltage regulating unit; The display unit is connected to the processor, and is used to display the DC high voltage signal output by the high voltage output unit.

2. The handheld digital display DC signal generator according to claim 1, characterized in that: The voltage regulating unit includes a first key circuit, a second key circuit and a third key circuit; The first key circuit, the second key circuit and the third key circuit are all connected to the processor.

3. The handheld digital display DC signal generator according to claim 1, characterized in that: The high voltage output unit includes a variable resistor RP1, a capacitor C1, a switch tube Q1, a transformer T1, an inductor L1, a switch tube Q2, a capacitor C3 and a resistor R3; The first end of the variable resistor RP1 is connected to the VCC power supply, the second end of the variable resistor RP1 is grounded, the sliding end of the variable resistor RP1 is connected to the first input end of the transformer T1 through the capacitor C1, the sliding end of the variable resistor RP1 is connected to the first end of the switch tube Q1, the control end of the switch tube Q1 is used to receive a PWM control signal, the second end of the switch tube Q1 is grounded, the second input end of the transformer T1 is connected to the third input end of the transformer T1, and the fourth input end of the transformer T1 is grounded; The first output end of the transformer T1 is connected to the first end of the inductor L1, the second output end of the transformer T1 is grounded, the second end of the inductor L1 is connected to the first end of the switch tube Q2, the control end of the switch tube Q2 is connected to the processor, the second end of the switch tube Q2 is grounded, the second end of the inductor L1 is grounded through the capacitor C3, the second end of the inductor L1 serves as the first output end of the high-voltage output unit, the first end of the resistor R3 is grounded, and the second end of the resistor R3 serves as the second output end of the high-voltage output unit.

4. The handheld digital display DC signal generator according to claim 3 is characterized in that: The high voltage output unit also includes a resistor R6, a resistor R4, an amplifier U1, an optical coupler U4, a resistor R9, a capacitor C6 and a controller U3; The first end of the resistor R6 is connected to the first output end of the transformer T1, the second end of the resistor R6 is grounded through the resistor R4, the second end of the resistor R6 is connected to the non-inverting input end of the amplifier U1, the output end of the amplifier U1 is connected to the inverting input end of the amplifier U1, the output end of the amplifier U1 is connected to the first input end of the optocoupler U4, the second input end of the optocoupler U4 is grounded, the first output end of the optocoupler U4 is connected to the discharge end of the controller U3, the second output end of the optocoupler U4 is grounded through the capacitor C6, the second output end of the optocoupler U4 is connected to the threshold input end of the controller U3, the threshold input end of the controller U3 is connected to the trigger input end of the controller U3, the discharge end of the controller U3 is connected to the VCC power supply through the resistor R9, and the output end of the controller U3 is connected to the control end of the switch tube Q1.

5. The handheld digital display DC signal generator according to claim 3, characterized in that: The high voltage output unit also includes a resistor R7, a resistor R8 and an amplifier U2; The first end of the resistor R7 is connected to the second end of the resistor R3, the second end of the resistor R7 is grounded through the resistor R8, the second end of the resistor R7 is connected to the non-inverting input end of the amplifier U2, the output end of the amplifier U2 is connected to the inverting input end of the amplifier U2, and the output end of the amplifier U2 is connected to the processor.

6. The handheld digital display DC signal generator according to claim 1, characterized in that: The power supply unit includes a button K1 , a first end of the button K1 is connected to a battery, and a second end of the button K1 is used to output a VCC power supply.

7. The handheld digital display DC signal generator according to claim 6, characterized in that: The power supply unit also includes a resistor R13, a resistor R14, a switch tube Q3, a light emitting diode LED1 and a switch tube Q4; The first end of the resistor R13 is connected to the second end of the button K1, the second end of the resistor R13 is grounded through the resistor R14, the second end of the resistor R13 is connected to the control end of the switch tube Q3, the first end of the switch tube Q3 is connected to the second end of the button K1, the second end of the switch tube Q3 is connected to the anode of the light-emitting diode LED1, the cathode of the light-emitting diode LED1 is grounded, the second end of the switch tube Q3 is connected to the control end of the switch tube Q4, the first end of the switch tube Q4 is connected to the second end of the button K1, and the second end of the switch tube Q4 is used to output the VCC power supply.

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