Oscilloscope

Abstract

The utility model discloses an oscilloscope, and relates to the technical field of oscilloscopes. The oscilloscope comprises an analog signal acquisition circuit, and the input end of the analog signal acquisition circuit is designed to be an external signal input port of the oscilloscope; the input end of the control circuit is connected with the output end of the analog signal acquisition circuit; the input end of the display circuit is connected with the first output end of the control circuit, and the output end of the display circuit is connected with the control end of the display screen; the input end of the power supply circuit is connected to the internal battery, and the output end of the power supply circuit is connected with the power supply ends of the analog signal acquisition circuit, the control circuit, the display circuit and the display screen.

Description

TECHNICAL FIELD

[0001] The utility model relates to oscilloscope technical field especially, relate to a kind of oscilloscope. BACKGROUND

[0002] Oscilloscope is a kind of instrument of observation electric signal, can not be seen and not be touched electronic signal by screen display, and professional oscilloscope price is very expensive, as high as several ten thousand yuan or even several ten thousand yuan, function is comprehensive, volume is also big.However, daily need to carry or the test demand under outdoor scene of business trip, just need to meet basic function, more pursue is portability, professional oscilloscope in the related art cannot meet the requirement. SUMMARY

[0003] The utility model at least one of the technical problems in the related art is aimed at solving in a certain extent.The utility model aims at providing an oscilloscope to improve the portability of oscilloscope.

[0004] To achieve the above-mentioned purpose, the utility model embodiment provides an oscilloscope, which comprises: an analog signal acquisition circuit, an input end of the analog signal acquisition circuit is designed as an external signal input port of the oscilloscope; a control circuit, an input end of the control circuit is connected with an output end of the analog signal acquisition circuit; a display circuit, an input end of the display circuit is connected with a first output end of the control circuit, and an output end of the display circuit is connected with a control end of a display screen; a power supply circuit, an input end of the power supply circuit is connected to an internal battery, and an output end of the power supply circuit is connected with a power supply end of the analog signal acquisition circuit, the control circuit, the display circuit and the display screen.

[0005] In the utility model embodiment, the analog signal acquisition circuit comprises an AD / DC switching circuit, a first acquisition sub-circuit and a second acquisition sub-circuit; an input end of the AD / DC switching circuit is designed as an external signal input port of the oscilloscope, a first output end of the AD / DC switching circuit is connected with an input end of the first acquisition sub-circuit, and a second output end of the AD / DC switching circuit is connected with an input end of the second acquisition sub-circuit; an output end of the first acquisition sub-circuit is connected with a first input end of the control circuit; and an output end of the second acquisition sub-circuit is connected with a second input end of the control circuit.

[0006] The utility model discloses an AD / DC switching circuit, including: relay, the first end of relay is connected to the negative pole of schottky diode, and is connected to the first power supply, the second end of relay is vacant, the first end of first capacitor is connected to the third end of relay, the second end of first capacitor is connected to the fourth end of relay, the first end of second capacitor is connected to the fifth end of relay, the second end of second capacitor is connected to the sixth end of relay, the seventh end of relay is vacant, the eighth end of relay is connected to the positive pole of schottky diode, the control end of first switch tube is designed as the control end of AD / DC switching circuit, the first end of first switch tube is connected to the eighth end of relay, and the second end of first switch tube is grounded, wherein the fifth end of relay is designed as the first input of AD / DC switching circuit, the fourth end of relay is designed as the second input of AD / DC switching circuit, the sixth end of relay is designed as the first output of AD / DC switching circuit, and the third end of relay is designed as the second output of AD / DC switching circuit.

[0007] In the embodiment of the utility model, the first acquisition subcircuit, including: double -way operational amplifier, the first end of double -way operational amplifier is connected to the first end of first resistance, the second end of double -way operational amplifier is connected to the negative pole of the first output end of AD / DC switch circuit, the third end of double -way operational amplifier is connected to the positive pole of the first output end of AD / DC switch circuit, the fourth end of double -way operational amplifier is connected to the negative pole of bipolar power supply, the fifth end of double -way operational amplifier is connected to the second end of first resistance and the first end of second resistance, the sixth end of double -way operational amplifier is connected to the first end of third resistance, the seventh end of double -way operational amplifier is connected to the second end of third resistance and the first end of fourth resistance, the eighth end of double -way operational amplifier is connected to the positive pole of bipolar power supply, eight analog switches, the first end of eight analog switches is connected to the first end of fifth resistance and sixth resistance, the second end of eight analog switches is connected to the first end of seventh resistance and eighth resistance, the third end of eight analog switches is connected to the negative pole of the first output end of AD / DC switch circuit, the fourth end of eight analog switches is connected to the second end of eighth resistance, the fifth end of eight analog switches is connected to the second end of fifth resistance and seventh resistance, the sixth end and eighth end of eight analog switches are ground terminal, the seventh end of eight analog switches is connected to the negative pole of bipolar power supply, the ninth end of eight analog switches is connected to the first control end of control circuit, the tenth end of eight analog switches is connected to the second control end of control circuit, the eleventh end of eight analog switches is connected to the third control end of control circuit, the twelfth end of eight analog switches is connected to the second end of sixth resistance and the first end of ninth resistance, the thirteenth end of eight analog switches is connected to the first end of tenth resistance, the fourteenth end of eight analog switches is connected to the second end of tenth resistance and the first end of eleventh resistance, the fifteenth end of eight analog switches is connected to the second end of ninth resistance and eleventh resistance, the sixteenth end of eight analog switches is connected to the positive pole of bipolar power supply, wherein, the fourth end of eight analog switches is also connected to the first end of twelfth resistance, the second end of twelfth resistance is grounded, the second end of second resistance is connected to second power supply, the second end of fourth resistance is designed as the output end of first acquisition subcircuit, the first end of double -way operational amplifier is also connected with the first end of tenth resistance.

[0008] In the embodiment of the utility model, the oscilloscope further comprises: a charging circuit, including an input interface subcircuit and a charging control subcircuit, the input end of the input interface subcircuit is connected with the output end of a preset power supply device, the output end of the input interface subcircuit is connected with the input end of the charging control subcircuit, and the output end of the charging control subcircuit is connected to the internal battery.

[0009] In the embodiment of the utility model, the charging control subcircuit further includes N control terminals, N is positive integer, the charging circuit further includes: indicator light subcircuit, the indicator light subcircuit includes N light emitting diode, N the light emitting diode with N the control terminal one to one correspondence, the anode of each light emitting diode all connects to third power supply, the cathode of light emitting diode connects to the control terminal corresponding with light emitting diode.

[0010] In the embodiment of the utility model, the oscilloscope further includes: a key circuit, the key circuit includes a key and a key trigger subcircuit, the input end of the key trigger subcircuit is connected with the contact of the key, and the output end of the key trigger subcircuit is connected to the third input end of the control circuit.

[0011] In the embodiment of the utility model, the oscilloscope further includes: a waveform generating circuit, and the input end of the waveform generating circuit is connected with the second output end of the control circuit.

[0012] In the embodiment of the utility model, the power supply circuit includes: a first power supply circuit, the input end of the first power supply circuit is connected to the internal battery, and the output end of the first power supply circuit is used to output the second power supply; and a second power supply circuit, the input end of the second power supply circuit is connected to the internal battery, and the output end of the second power supply circuit is used to output the bipolar power supply.

[0013] In the embodiment of the utility model, the second power supply is a 2.5V power supply, the positive voltage of the bipolar power supply is +5V, and the negative voltage of the bipolar power supply is -5V.

[0014] According to the oscilloscope in the embodiment of the utility model, the oscilloscope is designed to include an analog signal acquisition circuit, a control circuit and a display circuit, the analog signal acquisition circuit acquires signals, the control circuit controls, and the display circuit controls to display, the oscilloscope function is simplified to be realized by the three circuits, the space occupied by the oscilloscope can be reduced, and the portability of the oscilloscope is improved. Moreover, the oscilloscope is powered by the internal battery, and the portability of the oscilloscope is further improved.

[0015] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structure block diagram of the oscilloscope of the embodiment of the utility model;

[0017] Figure 2 It is the circuit diagram of the oscilloscope of one example of the utility model;

[0018] Figure 3 is a circuit diagram of an oscilloscope of another example of the present application;

[0019] Figure 4 is a circuit diagram of an oscilloscope of another example of the present application;

[0020] Figure 5 is a circuit diagram of an oscilloscope of another example of the present application;

[0021] Figure 6 is a circuit diagram of an oscilloscope of another example of the present application;

[0022] Figure 7 is a circuit diagram of an oscilloscope of another example of the present application;

[0023] Figure 8 is a circuit diagram of an oscilloscope of another example of the present application;

[0024] Figure 9 is a circuit diagram of an oscilloscope of another example of the present application;

[0025] Figure 10 is a circuit diagram of an oscilloscope of another example of the present application;

[0026] Figure 11 is a circuit diagram of an oscilloscope of another example of the present application;

[0027] Figure 12 is a circuit diagram of an oscilloscope of another example of the present application;

[0028] Figure 13 is a circuit diagram of an oscilloscope of another example of the present application;

[0029] Figure 14 is a circuit diagram of an oscilloscope of another example of the present application;

[0030] Figure 15 is a circuit diagram of an oscilloscope of another example of the present application;

[0031] Figure 16 is a circuit diagram of an oscilloscope of another example of the present application;

[0032] Figure 17 is a circuit diagram of an oscilloscope of another example of the present application;

[0033] Figure 18 is a circuit diagram of an oscilloscope of another example of the present application;

[0034] Figure 19 is a circuit diagram of an oscilloscope of another example of the present application;

[0035] Figure 20 is a circuit diagram of the oscilloscope of another example of the present application;

[0036] Figure 21 is a circuit diagram of the oscilloscope of another example of the present application;

[0037] Figure 22 is a structural block diagram of the oscilloscope of an example of the present application. DETAILED DESCRIPTION

[0038] The oscilloscope of the embodiments of the present application is described below with reference to the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described with reference to the accompanying drawings are exemplary and should not be construed as limiting the present application.

[0039] Figure 1 is a structural block diagram of the oscilloscope of an example of the present application.

[0040] As shown in Figure 1 , the oscilloscope 1000 comprises: an analog signal acquisition circuit 100, an input end of the analog signal acquisition circuit 100 being designed as an external signal input port of the oscilloscope 1000; a control circuit 101, an input end of the control circuit 101 being connected with an output end of the analog signal acquisition circuit 100; a display circuit 102, an input end of the display circuit 102 being connected with a first output end of the control circuit 101, and an output end of the display circuit 102 being connected with a control end of a display screen; and a power supply circuit 103, an input end of the power supply circuit 103 being connected to an internal battery, and an output end of the power supply circuit 103 being connected with a power supply end of the analog signal acquisition circuit 100, the control circuit 101, the display circuit 102 and the display screen.

[0041] Specifically, the oscilloscope is provided with the analog signal acquisition circuit 100, the control circuit 101 and the display circuit 102, the input end of the analog signal acquisition circuit 100 being designed as the external signal input port of the oscilloscope 1000, and the external signal being input into the oscilloscope 1000 via the input end of the analog signal acquisition circuit 100.

[0042] After the external signal is input into the oscilloscope 1000, the analog signal acquisition circuit 100 performs signal acquisition and sends the acquisition result to the control circuit 101.

[0043] The control circuit 101 is a main controller of the oscilloscope 1000, and is configured to send a control signal to the display circuit 102 according to the acquisition result after receiving the acquisition result of the analog signal acquisition circuit 100. The control circuit 101 can be a circuit including a main controller and a supporting circuit thereof, and the main controller can be a CPU (Central Processing Unit), and the supporting circuit can be a circuit in the related art or can be designed according to actual needs, as long as the main controller can work according to the program in the main controller.

[0044] The display circuit 102 is configured to control the display screen according to the control signal sent by the control circuit 101, so as to display the received waveform on the display screen.

[0045] In addition, the oscilloscope 1000 further includes a power supply circuit 103, the input end of the power supply circuit 103 is connected to an internal battery, and the output end of the power supply circuit 103 is connected to the analog signal acquisition circuit 100, the control circuit 101, the display circuit 102 and the power supply end of the display screen. That is, by arranging the power supply circuit 103, the internal battery is used to supply power to the oscilloscope 1000.

[0046] Therefore, the oscilloscope 1000 is designed to include the analog signal acquisition circuit 100, the control circuit 101 and the display circuit 102, the analog signal acquisition circuit 100 is configured to acquire signals, the control circuit 101 is configured to control, and the display circuit 102 is configured to display. By simplifying the oscilloscope function of the oscilloscope 1000 to be realized by three circuits, the space occupied by the oscilloscope can be reduced, and the portability of the oscilloscope can be improved. In addition, the oscilloscope is powered by an internal battery, which further improves the portability of the oscilloscope.

[0047] In an embodiment of the utility model, the analog signal acquisition circuit 100 includes an AD / DC switching circuit, a first acquisition sub-circuit and a second acquisition sub-circuit. The input end of the AD / DC switching circuit is designed as the external signal input port of the oscilloscope 1000. The first output end of the AD / DC switching circuit is connected to the input end of the first acquisition sub-circuit. The second output end of the AD / DC switching circuit is connected to the input end of the second acquisition sub-circuit. The output end of the first acquisition sub-circuit is connected to the first input end of the control circuit 101. The output end of the second acquisition sub-circuit is connected to the second input end of the control circuit 101.

[0048] Specifically, since the external signal can be a direct current signal or an alternating current signal, the analog signal acquisition circuit 100 includes an AD / DC switching circuit. By the AD / DC switching circuit, the type of signal that can be received by the oscilloscope 1000 is switched according to the type of external signal.

[0049] In other words, when the external signal is a DC signal, the AD / DC switching circuit switches it to allow the oscilloscope 1000 to receive DC signals. When the external signal is an AC signal, the AD / DC switching circuit switches it to allow the oscilloscope 1000 to receive AC signals.

[0050] Furthermore, a first acquisition sub-circuit and a second acquisition sub-circuit are provided to acquire the received signal and to perform other preset processing on the acquired signal, such as amplifying the acquired signal.

[0051] In one embodiment of this utility model, the AD / DC switching circuit includes: a relay, the first terminal of which is connected to the negative terminal of a Schottky diode and to a first power supply; the second terminal of which is unconnected; the third terminal of which is connected to the first terminal of a first capacitor; the fourth terminal of which is connected to the second terminal of the first capacitor; the fifth terminal of which is connected to the first terminal of a second capacitor; the sixth terminal of which is connected to the second terminal of the second capacitor; the seventh terminal of which is unconnected; and the eighth terminal of which is connected to the positive terminal of the Schottky diode; a first switching transistor, the control terminal of which is designed as the control terminal of the AD / DC switching circuit; the first terminal of which is connected to the eighth terminal of the relay; and the second terminal of which is grounded; wherein the fifth terminal of the relay is designed as the first input terminal of the AD / DC switching circuit; the fourth terminal of the relay is designed as the second input terminal of the AD / DC switching circuit; the sixth terminal of the relay is designed as the first output terminal of the AD / DC switching circuit; and the third terminal of the relay is designed as the second output terminal of the AD / DC switching circuit.

[0052] The following is combined Figure 2 The specific embodiments shown will be described in detail.

[0053] exist Figure 2 In the specific embodiment shown, relay RELAY1 includes a first terminal 1, a second terminal 2, a third terminal 3, a fourth terminal 4, a fifth terminal 5, a sixth terminal 6, a seventh terminal 7, and an eighth terminal 8. The internal structure of relay RELAY1 can be configured according to actual conditions, as long as it can control whether the sixth terminal 6 of relay RELAY1 is internally connected to the fifth terminal 5 or the seventh terminal 7 according to the on / off state of the first switch Q1, and can control whether the third terminal 3 of relay RELAY1 is internally connected to the second terminal 2 or the fourth terminal 4 according to the on / off state of the first switch Q1.

[0054] D1 is the Schottky diode described above, VBAT is the first power source described above, and in this embodiment, the first power source is the internal battery described above. RF1 is the first input terminal of the AD / DC switching circuit, RF2 is the second input terminal of the AD / DC switching circuit, A1IN+ is the positive terminal of the first output terminal of the AD / DC switching circuit, and B1IN+ is the positive terminal of the second output terminal of the AD / DC switching circuit.

[0055] Further comprising resistors R13, R14, R16, R17, R22, R23, capacitors C9, C11, C13, C14, wherein the capacitors C9, C11, C13, C14 are filter capacitors, and the resistors R13, R14, R22, R23 are voltage dividing resistors.

[0056] Specifically, the control logic of RELAY1 is shown in Table 1 below:

[0057] Table 1

[0058]

[0059] When RF1 and RF2 input is a direct current signal, a high level signal is output to the control end AC / DC EN, Q1 is turned on, RELAY1 is controlled to be attracted, the pins 3, 6 of RELAY1 are connected with the pins 4, 5 respectively, and the C1 and C2 capacitors are bypassed.

[0060] When RF1 and RF2 input is an alternating current signal, a low level signal is output to the control end AC / DC EN, Q1 is turned off, RELAY1 is controlled to be disconnected, the pins 3, 6 of RELAY1 are connected with the pins 2, 7 respectively, and according to the characteristic of C1 and C2 capacitors that they pass direct current and block alternating current, the direct current alternating current signal can pass through.

[0061] In an embodiment of the utility model, first acquisition subcircuit, include: dual -channel operational amplifier, the first end of dual -channel operational amplifier is connected to the first end of first resistance, the negative pole of the first output end of AD / DC switch circuit is connected to the second end of dual -channel operational amplifier, the positive pole of the first output end of AD / DC switch circuit is connected to the third end of dual -channel operational amplifier, the negative pole of bipolar power supply is connected to the fourth end of dual -channel operational amplifier, the second end of first resistance is connected to the fifth end of dual -channel operational amplifier, and the first end of second resistance is connected to the fifth end of dual -channel operational amplifier, the first end of third resistance is connected to the sixth end of dual -channel operational amplifier, the second end of third resistance is connected to the seventh end of dual -channel operational amplifier, and the first end of fourth resistance is connected to the seventh end of dual -channel operational amplifier, the positive pole of bipolar power supply is connected to the eighth end of dual -channel operational amplifier;Eight analog switches, the first end of eight analog switches is connected to the first end of fifth resistance and sixth resistance, the first end of seventh resistance and eighth resistance is connected to the second end of eight analog switches, the negative pole of the first output end of AD / DC switch circuit is connected to the third end of eight analog switches, the second end of eighth resistance is connected to the fourth end of eight analog switches, the second end of fifth resistance and seventh resistance is connected to the fifth end of eight analog switches, the sixth end and eighth end of eight analog switches are ground terminal, the negative pole of bipolar power supply is connected to the seventh end of eight analog switches, the first control end of control circuit 101 is connected to the ninth end of eight analog switches, the second control end of control circuit 101 is connected to the tenth end of eight analog switches, the third control end of control circuit 101 is connected to the eleventh end of eight analog switches, the second end of sixth resistance and the first end of ninth resistance are connected to the twelfth end of eight analog switches, the first end of tenth resistance is connected to the thirteenth end of eight analog switches, the second end of tenth resistance is connected to the fourteenth end of eight analog switches, and the first end of eleventh resistance is connected to the fourteenth end of eight analog switches, the second end of ninth resistance and eleventh resistance is connected to the fifteenth end of eight analog switches, the positive pole of bipolar power supply is connected to the sixteenth end of eight analog switches;Wherein, the first end of fourth resistance is also connected to the first end of twelfth resistance, the second end of twelfth resistance is grounded, the second end of second resistance is connected to the second power supply, the second end of fourth resistance is designed as the output end of first acquisition subcircuit, and the first end of tenth resistance is also connected to the first end of twelfth resistance.

[0062] The first acquisition subcircuit can refer to the specific embodiment shown in the above Figure 3 .

[0063] In Figure 3In the specific embodiment shown, the first end 1 of the dual operational amplifier U4 is connected to the first end of the first resistor R1, the second end 2 of the dual operational amplifier U4 is connected to the negative pole A1IN- of the first output end of the AD / DC switching circuit, the third end 3 of the dual operational amplifier U4 is connected to the positive pole A1IN+ of the first output end of the AD / DC switching circuit, the fourth end 4 of the dual operational amplifier U4 is connected to the negative pole VDD- 5V of the bipolar power supply, the fifth end 5 of the dual operational amplifier U4 is connected to the second end of the first resistor R1 and to the first end of the second resistor R2, the sixth end 6 of the dual operational amplifier U4 is connected to the first end of the third resistor R3, the seventh end 7 of the dual operational amplifier U4 is connected to the second end of the third resistor R3 and to the first end of the fourth resistor R4, and the eighth end 8 of the dual operational amplifier U4 is connected to the positive pole of the bipolar power supply VDD+ 5V. The second end of the second resistor R2 is connected to the second power supply +2.5V, and the second end of the fourth resistor R4 is designed as the output end of the first acquisition sub-circuit ADC0.

[0064] In Figure 3 the specific embodiment shown, the capacitor C10 is further included. In Figure 3 the specific embodiment shown, the dual operational amplifier U4 is a TLV2372IDR operational amplifier.

[0065] The above-mentioned eight-way analog switch can refer to Figure 4 the specific embodiment shown. Figure 5

[0066] Specifically, in Figure 4 the specific embodiment shown. Figure 5 ​In the specific embodiment shown, the first end 1 of the eight-way analog switch U5 is connected to the first end of the fifth resistor R5 and the sixth resistor R6, the second end 2 of the eight-way analog switch U5 is connected to the first end of the seventh resistor R7 and the eighth resistor R8, the third end 3 of the eight-way analog switch U5 is connected to the negative pole of the first output end of the AD / DC switching circuit, the fourth end 4 of the eight-way analog switch U5 is connected to the second end of the eighth resistor R8, the fifth end 5 of the eight-way analog switch U5 is connected to the second end of the fifth resistor R5 and the seventh resistor R7, the sixth end 6 and the eighth end 8 of the eight-way analog switch U5 are grounded, the ground AGND, the seventh end 7 of the eight-way analog switch U5 is connected to the negative pole VDD-5V of the bipolar power supply, the ninth end 9 of the eight-way analog switch U5 is connected to the first control end of the control circuit 101, the tenth end 10 of the eight-way analog switch U5 is connected to the second control end of the control circuit 101, the eleventh end 11 of the eight-way analog switch U5 is connected to the third control end of the control circuit 101, the twelfth end 12 of the eight-way analog switch U5 is connected to the second end of the sixth resistor R6 and the first end of the ninth resistor R9, the thirteenth end 13 of the eight-way analog switch U5 is connected to the first end of the tenth resistor R10, the fourteenth end 14 of the eight-way analog switch U5 is connected to the second end of the tenth resistor R10 and the first end of the eleventh resistor R11, the fifteenth end 15 of the eight-way analog switch U5 is connected to the second end of the ninth resistor R9 and the eleventh resistor R11, and the sixteenth end 16 of the eight-way analog switch U5 is connected to the positive pole VDD+5V of the bipolar power supply; wherein the fourth end 4 of the eight-way analog switch U5 is also connected to the first end of the twelfth resistor R12, and the second end of the twelfth resistor R12 is grounded.

[0067] In Figure 4 the specific embodiment shown, U5 is an analog switch 74HC4051PW.

[0068] It should be noted that in Figure 3 , Figure 4 , Figure 5 AY0, AY1, AY2, AY3, AY4, AY5, AY6, AY7 are only symbols for identifying connection relationships, for example, Figure 3 AY0 exists in both Figure 5 , it means that the position identified by AY0 in Figure 3 is connected to the position identified by AY0 in Figure 5 , that is, the first end of the above-mentioned dual operational amplifier U4 is also connected to the first end of the tenth resistor R10. AS0, AS1, AS2 respectively represent that the three ports are connected to the first control end, the second control end, and the third control end of the control circuit 101.

[0069] Specifically, Figure 3 , Figure 4 , Figure 5The working principle of the combination circuit composed of the circuit in the control circuit 101 can be seen from the equivalent model shown in Figure 6 It can be seen that by controlling U5, the feedback resistance connected with U4 can be switched, so as to realize different amplification multiples, and the feedback resistance value can be designed by itself. Moreover, the signals output by A 1IN+ and A 1IN- will pass through the double operational amplifier U4 (which can be equivalent to two operational amplifiers in Figure 6 ), realize signal translation, and realize conversion of negative voltage signals into positive voltage signals, so as to ensure that the collected signals are within the collection range of the control circuit 101.

[0070] The control circuit 101 can control the eight-way analog switch U5 by being connected with the ninth end 9, the tenth end 10 and the eleventh end 11 of the eight-way analog switch U5. For details, refer to Table 2 below.

[0071] Table 2

[0072]

[0073] S0 in Table 2 above is the first control end of the control circuit 101, S1 is the second control end of the control circuit 101, and S2 is the third control end of the control circuit 101.

[0074] Z is the equivalent control result of the eight-way analog switch U5. For details, refer to the equivalent circuit shown in Figure 6 , and take A Y0, A Y1 and A Y2 as examples. When S0 is 0, S1 is 0 and S2 is 0, Z is A Y0, which means that when the first control end, the second control end and the third control end of the control circuit 101 all output low level, U5 runs the internal program to realize the closing of the equivalent switch corresponding to A Y0 in Figure 6 ; when S0 is 0, S1 is 0 and S2 is 1, Z is A Y1, which means that when the first control end and the second control end of the control circuit 101 output low level and the third control end outputs high level, U5 runs the internal program to realize the closing of the equivalent switch corresponding to A Y1 in Figure 6 ; when S0 is 0, S1 is 1 and S2 is 0, Z is A Y2, which means that when the first control end and the third control end of the control circuit 101 both output low level and the second control end outputs high level, U5 runs the internal program to realize the closing of the equivalent switch corresponding to A Y2 in Figure 6 .

[0075] In an embodiment of the utility model, the second collection sub-circuit can refer to Figure 7 , Figure 8 and Figure 9The specific embodiment shown is a dual-channel oscilloscope 1000, so two acquisition sub-circuits, a first acquisition sub-circuit and a second acquisition sub-circuit, are provided to realize dual-channel acquisition.

[0076] In this specific embodiment, the second acquisition sub-circuit includes U6 and U7, wherein U6 is a dual-channel operational amplifier and U7 is an eight-channel analog switch. The second acquisition sub-circuit further includes resistors R24, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, and R35, and a capacitor C15.

[0077] It should be noted that, in the specific embodiment shown in Figure 7 , Figure 8 , Figure 9 , BY0, BY1, BY2, BY3, BY4, BY5, BY6, BY7, BS0, BS1, and BS2 are merely symbols for identifying connection relationships, for example, Figure 7 and Figure 9 both have BY0, which means that the position identified by BY0 in Figure 7 is connected to the position identified by BY0 in Figure 9 , that is, the first end 1 of the above-mentioned U6 is also connected to the first end of the resistor R28. The second end ADC1 of the resistor R24 is designed as the output end of the second acquisition sub-circuit. The second end 2 of U6 is connected to the negative electrode B1IN- of the second output end of the AD / DC switching circuit, and the third end 3 of U6 is connected to the positive electrode B1IN+ of the second output end of the AD / DC switching circuit.

[0078] It should be noted that other specific embodiments of the second acquisition sub-circuit can refer to the first acquisition sub-circuit of the above-mentioned embodiments.

[0079] In an embodiment of the utility model, still include: charging circuit, including input interface subcircuit and charge control subcircuit, input interface subcircuit's input end is connected with the output end of preset power supply equipment, and input interface subcircuit's output end is connected with the input end of charge control subcircuit, and the output end of charge control subcircuit is connected to internal battery.

[0080] Specifically, the above-mentioned input interface subcircuit can refer to the specific embodiment shown in Figure 10 .

[0081] In the specific embodiment shown in Figure 10 , the preset power supply equipment is an external USB power supply, and the input interface subcircuit includes a USB1, which is a USB interface and includes a first end 1, a second end 2, a third end 3, a fourth end 4, a fifth end 5, a sixth end 6, and a seventh end 7.

[0082] The first end 1 of the USB interface USB1 is used for receiving an external USB power supply 5V USB, the fourth end of the USB interface USB1 is grounded GND, and the second end 2 and the third end 3 of the USB interface are vacant.

[0083] The above charging control sub-circuit can refer to Figure 11 and Figure 12 the specific embodiments shown.

[0084] Specifically, Figure 11 U13 in is a charging chip, which adopts TP4056 lithium internal battery charging chip, Figure 11 The resistor R44 and the resistor R46 are further arranged in the charging current I = 1200 / R44, and the charging current can be adjusted by adjusting the resistance value of R44. Figure 12 H1 in is a battery interface, and the first pin 1 of H1 and the second pin 2 of H1 are respectively connected to the positive and negative poles of an external power supply battery. Figure 12 VBAT2 in is the voltage provided by the external power supply battery, and the voltage needs to be as same as the voltage VBAT output by the internal battery as far as possible.

[0085] The first end 1 of U13 is grounded, the second end 2 of U13 is connected to the first end of the resistor R44, the third end 3 of U13 is grounded, the fourth end 4 of U13 is connected to the first end of the resistor R46, and the ninth end 9 of U13 is grounded.

[0086] The fifth end 5 and the eighth end 8 of U13 are both used for outputting the voltage VBAT1 for charging the internal battery. Moreover, the voltage output by U13 is the same as the voltage output by the internal battery.

[0087] It should be noted that the above USB1 and the above H1 are arranged in the present application, which means that the oscilloscope 1000 can be powered by an external USB power supply or an external power supply battery. When the USB power supply is used for power supply, the above USB interface USB1 is put into work, and the 5V power supply 5V_USB provided by the external USB power supply is provided to the internal battery; when the external power supply battery is used for power supply, the above battery interface H1 is put into work, and the power supply provided by the external power supply battery is provided to the internal battery. Moreover, when the external power supply battery is used for power supply, the battery interface H1 does not need to pass through the charging control sub-circuit, and can directly charge the internal battery through the external power supply. The interface connected with U13 in the above USB interface USB1 and the interface connected with the internal battery in the above battery interface H1 are not shown in the drawings.

[0088] In an embodiment of the utility model, charging control subcircuit still include N control end, N is positive integer, charging circuit, still include: pilot lamp subcircuit, pilot lamp subcircuit includes N light emitting diode, N light emitting diode with N control end one to one correspondence, the anode of each light emitting diode all connects to third power supply, the cathode of light emitting diode connects to the control end corresponding with light emitting diode.

[0089] Specifically, the pilot lamp subcircuit can refer to the specific embodiment shown in Figure 13 .

[0090] In Figure 13 the specific embodiment shown, pilot lamp subcircuit includes two light emitting diodes, respectively LEDB1 and LEDR1, still includes resistance R45 and resistance R47, Figure 13 CHRG and STDBY in Figure 13 Two ends are connected with the eighth end 8 and the sixth end 6 of U13 in Figure 11 Respectively. CHGE and STDBY control the on-off of pilot lamp, for indicating charging state, and charging voltage is provided by 5V USB. Specifically, as shown in Table 3:

[0091] Table 3

[0092]

[0093] In an embodiment of the utility model, still include: key circuit, key circuit includes key and key trigger subcircuit, the input end of key trigger subcircuit is connected with the contact of key, and the output end of key trigger subcircuit is connected to the third input end of control circuit 101.

[0094] Specifically, the key circuit includes a key and a key trigger subcircuit, the input end of the key trigger subcircuit is connected with the contact of the key, when the key is pressed, the key trigger subcircuit will receive the information that the key is pressed, and the information is used as an input signal, and an output signal is generated according to the input signal, and output to the control circuit 101.

[0095] The key circuit is used to realize various auxiliary functions, including AC / DC signal switching, amplification multiple selection, start-up pause acquisition and other functions, and the key circuit can realize up to 64 function definitions, which can be designed and defined by the user.

[0096] The specific embodiments shown in Figure 14 and Figure 15 will be described below.

[0097] In Figure 14 and Figure 15In the specific embodiment shown, SW1 is a first key of the oscilloscope 1000, SW2 is a second key of the oscilloscope 1000, K11 is a first key output signal, K12 is a second key output signal, K1T is a third key output signal, K21 is a fourth key output signal, K22 is a fifth key output signal, K2T is a sixth key output signal, CN1 is a first connector seat, CN2 is a second connector seat, U8 is an operational amplifier, VOUT DAC is an output of the operational amplifier U8, and DAC is an input of the operational amplifier U8.

[0098] The key output signals can be output to a CPU in the control circuit 101 so that the CPU controls according to the key pressed.

[0099] Table 4

[0100]

[0101] In one embodiment of the utility model, still include: waveform generating circuit, waveform generating circuit's input end is connected with control circuit 101's second output end. Through setting waveform generating circuit, can realize the output of specific wave form and assist test, for example, common waveforms such as square wave, sine wave, through a one-way operational amplifier design into voltage follower, to isolate the signal interference between input and output.

[0102] In one embodiment of the utility model, power supply circuit 103, include: first power supply circuit, the input end of first power supply circuit is connected to internal battery, and the output end of first power supply circuit is used to output second power supply;Second power supply circuit, the input end of second power supply circuit is connected to internal battery, and the output end of second power supply circuit is used to output bipolar power supply.

[0103] The following will be described in conjunction with a specific embodiment.

[0104] In the specific embodiment, the second power supply is a 2.5V power supply, the positive voltage of the bipolar power supply is +5V, and the negative voltage of the bipolar power supply is -5V.

[0105] Specifically, in the specific embodiment, the first power supply circuit can refer to Figure 16 .

[0106] In Figure 16 , resistors R40, capacitors C23, C24, C25, and C26 are provided, U12 is a reference voltage chip, and a CJ431 voltage stabilizing triode is used.

[0107] Among them, the A end of U12 is negative, the R end is reference, and the K end is positive.

[0108] Based on the circuit shown in the figure, the power provided by the internal battery with voltage VBAT can be converted into a second power supply with voltage 2.5V. Figure 16

[0109] The above-mentioned second power supply circuit can refer to Figure 17 and Figure 18 .

[0110] In the Figure 17 , resistance R39, diode D2, capacitor C18, capacitor C19, capacitor C20, capacitor C21, inductor L2, U9 is a DC-DC converter, and in Figure 17 , DC-DC converter AW3605DNR is adopted.

[0111] Based on the circuit shown in the figure, the power provided by the internal battery with voltage VBAT can be converted into a second power supply with voltage 2.5V. Figure 17

[0112] In the Figure 18 , resistance R38, capacitor C16, capacitor C17, capacitor C22, U10 is a DC / DC converter, and in Figure 18 , DC / DC converter SGM3204YN6G / TR is adopted.

[0113] Among them, VCC+5V and VCC-5V mainly supply the operational amplifier and the analog switch, realize double power supply, and expand the input signal voltage range. The use of 2.5V reference voltage can realize the translation of the signal, and ensure that the voltage range of the processed signal is within the collection range of the control circuit 101.

[0114] In this embodiment, the power supply circuit 103 further comprises Figure 19 the circuit shown in the figure.

[0115] In this circuit, it includes capacitor C27, capacitor C28, resistor R41, resistor R42, resistor R43, U11 is a radio frequency linear voltage regulator, and in Figure 19 , radio frequency linear voltage regulator SGM2019-ADJYN5G / TR is adopted.

[0116] In the circuit shown in the figure, the input is a power supply with voltage VBAT, and the output is a 3.3V power supply 3V3. Figure 19 In one embodiment of the present application, a display screen as shown in

[0117] and a display circuit 102 as shown in Figure 20 are provided. Figure 21

[0118] ​​​Among them, U2 is a resistive touch screen, and the control circuit 101 outputs signals to the resistive touch screen U2 for display. U3 is a resistive touch screen control chip to realize the touch function.

[0119] The touch signals of the resistive touchscreen are transmitted to U3 via XL, YU, XR, and YD.

[0120] U3 interacts with the control circuit 101 to control the circuit and change the displayed image. U3 is a resistive touchscreen. Figure 21 The XPT2046 resistive touchscreen chip is used in this device.

[0121] LCD_RST is the LCD reset signal, SPI2 SCK is the first clock signal, LCD_DC is the data command control signal, LCD CS is the chip select signal, SPI2_MOSI is the first CPU data output signal, SPI2 MISO is the first CPU data input signal, LCD BLK is the backlight control signal, SPI4 SCK is the second clock signal, TOU CS is the chip select signal, SPI4 MOSI is the second CPU data output signal, and SPI4 MISO is the second CPU data input signal. All of these signals are obtained through interaction with the CPU in control circuit 101. TOU INT is the result of the control chip power input after passing through R18, and TVDD is the control chip power input.

[0122] In one embodiment of this utility model, see Figure 22 It includes an analog signal acquisition circuit 100, a control circuit 101, a display circuit 102, a power supply circuit 103, an internal battery 104, a button circuit 105, a charging circuit 106, a waveform generation circuit 107, and a preset power supply device 108. Figure 22 In this context, the preset power supply device is a USB power supply used to provide 5V USB power (5V_USB).

[0123] It should be noted that, in Figure 2~Figure 21 In this context, the numbers 1, 2, 3..., 18, etc., simply represent the specific pin number of the device corresponding to each specific number. For example, Figure 3 At point U4 and Figure 4 If there is a 1 at all points U5, then the first end of U4 is... Figure 3 The 1 mark at U4, the first end of U5 is... Figure 4 The 1 mark at U5; for example, in Figure 3 In the image, there are three 1s. The 1 at RELAY1 refers to the first end of RELAY1, the 1 at RF1 refers to the first end of the receiving device at RF1, and the 1 at RF2 refers to the first end of the receiving device at RF2. For example, in... Figure 18In the middle, U10 has 1, 2, 3, 1 represents the first end of U10, 2 represents the second end of U10, and 3 represents the third end of U10. Figure 2~Figure 21 The specific meanings of the numbers 1, 2, 3…, 18 of other parts in the middle can be referred to the above examples.

[0124] The oscilloscope of the embodiment of the utility model, the oscilloscope is designed to include three circuits of analog signal acquisition circuit, control circuit and display circuit, the analog signal acquisition circuit carries out signal acquisition, the control circuit controls, the display circuit controls and displays, the oscilloscope function is simplified to be realized by three circuits, can reduce the space occupied by the oscilloscope, improve the portability of the oscilloscope.

[0125] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein can be considered as a list of ordered steps for implementing logical functions, which can be embodied in any computer readable medium for use by or in connection with an instruction execution system, apparatus or device, such as a computer-based system, a system including a processor or other system that can fetch and execute instructions from the instruction execution system, apparatus or device. For the purpose of this specification, "computer readable medium" can be any device that can contain, store, communicate, propagate or transport a program for use by or in connection with an instruction execution system, apparatus or device or in conjunction with these instruction execution systems, apparatus or devices. More specific examples (non-exhaustive list) of computer readable medium include the following: electrical connections having one or more wires (electronic devices), portable computer diskette (magnetic devices), random access memory (RAM), read only memory (ROM), erasable programmable read only memory (EPROM or flash memory), fiber optic devices, and portable compact disk read only memory (CD ROM). In addition, the computer readable medium can even be paper or other suitable medium on which the program can be printed, because the program can be electronically obtained, for example, by optical scanning of the paper or other medium, followed by editing, interpreting or processing as necessary, and then stored in the computer memory.

[0126] It should be understood that each part of the present application can be realized by hardware, software, firmware or a combination thereof. In the above-described embodiments, a plurality of steps or methods can be realized by software or firmware stored in a memory and executed by a suitable instruction execution system. If realized by hardware, and as in another embodiment, it can be realized by any one or a combination of the following technologies known in the art: discrete logic circuit with logic gate circuit for implementing logic function on data signal, application specific integrated circuit with suitable combination logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) and the like.

[0127] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0128] In the description of the present application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as a limitation of the present application.

[0129] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0130] In the description of the present application, unless otherwise specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0131] In the present application, unless otherwise specified and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact or indirectly contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0132] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. Those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An oscilloscope, characterized by The utility model relates to a kind of oscilloscope, including: Analog signal acquisition circuit, the input end of the analog signal acquisition circuit is designed as the external signal input port of the oscilloscope; Control circuit, the output end of the analog signal acquisition circuit is connected with the input end of the control circuit; Display circuit, the first output end of the control circuit is connected with the input end of the display circuit, and the output end of the display circuit is connected with the control end of display screen; Power supply circuit, the input end of the power supply circuit is connected to internal battery, and the output end of the power supply circuit is connected with the power supply end of the analog signal acquisition circuit, the control circuit, the display circuit and the display screen; The analog signal acquisition circuit includes AD / DC switching circuit, first acquisition subcircuit and second acquisition subcircuit; The input end of the AD / DC switching circuit is designed as the external signal input port of the oscilloscope, the first output end of the AD / DC switching circuit is connected with the input end of the first acquisition subcircuit, and the second output end of the AD / DC switching circuit is connected with the input end of the second acquisition subcircuit; The output end of the first acquisition subcircuit is connected with the first input end of the control circuit; The output end of the second acquisition subcircuit is connected with the second input end of the control circuit.

2. The oscilloscope of claim 1, wherein, The AD / DC switching circuit includes: Relay, the first end of the relay is connected to the negative pole of Schottky diode and is connected to the first power supply, the second end of the relay is vacant, the third end of the relay is connected to the first end of the first capacitor, the fourth end of the relay is connected to the second end of the first capacitor, the fifth end of the relay is connected to the first end of the second capacitor, the sixth end of the relay is connected to the second end of the second capacitor, the seventh end of the relay is vacant, and the eighth end of the relay is connected to the positive pole of the Schottky diode; First switch tube, the control end of the first switch tube is designed as the control end of the AD / DC switching circuit, the first end of the first switch tube is connected to the eighth end of the relay, and the second end of the first switch tube is grounded; Wherein, the fifth end of the relay is designed as the first input end of the AD / DC switching circuit, the fourth end of the relay is designed as the second input end of the AD / DC switching circuit, the sixth end of the relay is designed as the first output end of the AD / DC switching circuit, and the third end of the relay is designed as the second output end of the AD / DC switching circuit.

3. The oscilloscope of claim 1, wherein, The first acquisition subcircuit includes: a dual-channel operational amplifier, a first end of the dual-channel operational amplifier is connected to a first end of a first resistor, a second end of the dual-channel operational amplifier is connected to a negative electrode of a first output end of the AD / DC switching circuit, a third end of the dual-channel operational amplifier is connected to a positive electrode of the first output end of the AD / DC switching circuit, a fourth end of the dual-channel operational amplifier is connected to a negative electrode of a bipolar power supply, a fifth end of the dual-channel operational amplifier is connected to a second end of the first resistor and a first end of a second resistor, a sixth end of the dual-channel operational amplifier is connected to a first end of a third resistor, a seventh end of the dual-channel operational amplifier is connected to a second end of the third resistor and a first end of a fourth resistor, and an eighth end of the dual-channel operational amplifier is connected to a positive electrode of the bipolar power supply; an eight-channel analog switch, a first end of the eight-channel analog switch is connected to first ends of a fifth resistor and a sixth resistor, a second end of the eight-channel analog switch is connected to first ends of a seventh resistor and an eighth resistor, a third end of the eight-channel analog switch is connected to a negative electrode of the first output end of the AD / DC switching circuit, a fourth end of the eight-channel analog switch is connected to a second end of the eighth resistor, a fifth end of the eight-channel analog switch is connected to second ends of the fifth resistor and the seventh resistor, sixth and eighth ends of the eight-channel analog switch are grounded, a seventh end of the eight-channel analog switch is connected to a negative electrode of the bipolar power supply, a ninth end of the eight-channel analog switch is connected to a first control end of the control circuit, a tenth end of the eight-channel analog switch is connected to a second control end of the control circuit, an eleventh end of the eight-channel analog switch is connected to a third control end of the control circuit, a twelfth end of the eight-channel analog switch is connected to a second end of the sixth resistor and a first end of a ninth resistor, a thirteenth end of the eight-channel analog switch is connected to a first end of a tenth resistor, a fourteenth end of the eight-channel analog switch is connected to a second end of the tenth resistor and a first end of an eleventh resistor, a fifteenth end of the eight-channel analog switch is connected to second ends of the ninth resistor and the eleventh resistor, and a sixteenth end of the eight-channel analog switch is connected to a positive electrode of the bipolar power supply; wherein the fourth end of the eight-channel analog switch is further connected to a first end of a twelfth resistor, a second end of the twelfth resistor is grounded, a second end of the second resistor is connected to a second power supply, and a second end of the fourth resistor is designed as an output end of the first acquisition sub-circuit, and the first end of the dual-channel operational amplifier is further connected to the first end of the tenth resistor.

4. The oscilloscope of claim 1, wherein, Further comprising: a charging circuit, including an input interface sub-circuit and a charging control sub-circuit, an input end of the input interface sub-circuit is connected to an output end of a preset power supply device, an output end of the input interface sub-circuit is connected to an input end of the charging control sub-circuit, and an output end of the charging control sub-circuit is connected to the internal battery.

5. The oscilloscope of claim 4, wherein, The charging control sub-circuit further includes N control ends, N is a positive integer, and the charging circuit further includes: The indicator light sub-circuit comprises N light emitting diodes, N light emitting diodes correspond to N control terminals one by one, the positive electrode of each light emitting diode is connected to the third power supply, and the negative electrode of the light emitting diode is connected to the control terminal corresponding to the light emitting diode.

6. The oscilloscope of claim 1, wherein, Further comprising: The key circuit comprises a key and a key trigger sub-circuit, the input end of the key trigger sub-circuit is connected with the contact of the key, and the output end of the key trigger sub-circuit is connected with the third input end of the control circuit.

7. The oscilloscope of claim 1, wherein, Further comprising: The waveform generating circuit is connected with the second output end of the control circuit.

8. The oscilloscope of claim 3, wherein, The power supply circuit comprises: The first power supply circuit is connected with the internal battery, and the output end of the first power supply circuit is used for outputting the second power supply; The second power supply circuit is connected with the internal battery, and the output end of the second power supply circuit is used for outputting the bipolar power supply.

9. The oscilloscope of claim 3, wherein, The second power supply is a 2.5V power supply, the positive voltage of the bipolar power supply is +5V, and the negative voltage of the bipolar power supply is -5V.

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