CN213181726U

CN213181726U - Multifunctional multimeter

Info

Publication number: CN213181726U
Application number: CN202022186338.4U
Authority: CN
Inventors: 陈彪; 陆建学; 刘�东; 陈龙; 罗福权; 蔡丽芬; 谭源; 李庆丹; 饶锡林
Original assignee: China Chippacking Technology Co ltd
Current assignee: China Chippacking Technology Co ltd
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2021-05-11
Anticipated expiration: 2030-09-29

Abstract

The utility model discloses a multifunctional multimeter, which comprises a processing chip, a power supply control module, a LED lighting circuit, an infrared laser circuit, a gear and range switching circuit and a display circuit, wherein the power supply control module, the LED lighting circuit, the infrared laser circuit, the gear and range switching circuit and the display circuit are all electrically connected with the processing chip; the gear and the range switching circuit are realized by matching two relays. Through the circuit design, the multifunctional multimeter has the advantages of practicality, simplicity and portability, and meanwhile, during design, the measurement voltage of the multifunctional multimeter is lower than 36V (for life safety, most of the voltage of a machine table is enough to DC 24V). In addition, the multifunctional multimeter has an LED lighting circuit and an IC open-short circuit measurement, and greatly facilitates the purpose of testers. Meanwhile, the multifunctional multimeter is reserved with an interface, so that more functions can be conveniently upgraded subsequently.

Description

Multifunctional multimeter

Technical Field

The utility model belongs to the technical field of the electrical measuring instrument technique and specifically relates to a multi-functional universal meter of miniature.

Background

The universal meter in the market at present has a large size, and can generally measure the voltage below AC-800V, the voltage below DC-1000V, the voltage difference of a resistor and a diode, the open-short circuit test (buzzing gear) and the test below the current 10A. In a semiconductor test line, a multimeter, a flashlight, and the like are frequently used, and an OS for measuring an IC is often used. The universal meter can not be carried about, tools are placed at a fixed position, and everyone can not be equipped with the universal meter, and the universal meter is inconvenient and time-consuming to find or take due to the fact that the production line space is large.

Therefore, for convenience and improvement of working efficiency, the utility model provides a practical, simple, portable multi-functional multimeter, makes its miniaturization can hand-carry, solves and takes or look for the problem that the multimeter is consuming time on test production line.

SUMMERY OF THE UTILITY MODEL

The following presents a simplified summary of embodiments of the invention in order to provide a basic understanding of some aspects of the invention. It should be understood that the following summary is not an exhaustive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.

According to an aspect of the application, a multifunctional multimeter is provided, which comprises a processing chip, a power control module, an LED lighting circuit, an infrared laser circuit, a gear and range switching circuit and a display circuit, wherein the power control module, the LED lighting circuit, the infrared laser circuit, the gear and range switching circuit and the display circuit are all electrically connected with the processing chip. The gear and range switching circuit is used for switching modes, and the modes comprise a voltage drop measurement mode, a voltage measurement mode and the like. In this application, this gear realizes through two relay cooperations with range switching circuit.

Specifically, the gear and range switching circuit comprises a relay K1, a relay K2, a resistor R2, a resistor R3, a resistor R4, a resistor R6, a resistor R7 and a resistor R8, wherein a 1 st pin of the relay K1 is connected with a power supply VCC, one path of a 2 nd pin of a relay K1 is connected with a 6 th pin of the relay K2, and the other path of the 2 nd pin of the relay K1 is connected with a 5 th pin of the relay K1; one path of a 3 rd pin of the relay K1 is connected with the resistor R2 in series and then connected to the processing chip, and the other path of the 3 rd pin is connected with the resistor R4 and the MOS transistor Q1 in series and then connected to the power supply VCC; the first path of the 4 th pin of the relay K1 is connected with the 3 rd pin of the relay K2 after being connected with the resistor R6 in series, the second path is connected with the 7 th pin of the relay K1, and the third path is grounded; one path of a 6 th pin of the relay K1 is connected in series with the resistor R3 and then is connected to the processing chip, and the other path is grounded; the 8 th pin of the relay K1 is connected to the processing chip; the 1 st pin of the relay K2 is connected with a power supply VCC, the 2 nd pin of the relay K2 is connected with the first end of a resistor R7 and the 7 th pin of the relay K2, the second end of the resistor R7 is connected with a resistor R8 and the 5 th pin of the relay K2, and the 8 th pin of the relay K2 is connected with a processing chip. Preferably, the relay K1 and the relay K2 both adopt a relay with model number TQ2-5V to realize the two-way switch gear shifting.

The power control module comprises a charging circuit, a battery, a USB power supply, a battery and a power switching circuit, wherein the USB power supply is realized by using a MICRO interface (android interface), and not only can be charged, but also can be burned into a program.

The battery and power supply switching circuit is used for selecting a battery or a USB power supply to supply power for the processing chip.

The charging circuit comprises a power management chip, a capacitor C1, a resistor R1, a resistor R9 and a resistor R10, wherein the power management chip is realized by a TP4056 power management IC, a TEMP pin, an EP pin and a GND pin of the power management chip are grounded, and a PROG pin of the power management chip is grounded after being connected with the resistor R10 in series; one path of a VCC pin of the power management chip is connected with a 5V power supply, and the other path of the VCC pin of the power management chip is connected with a capacitor C1 in series and then is grounded; the first path of the CE pin of the power management chip is connected with a 5V power supply, the second path of the CE pin is connected with the STDBY pin of the power management chip after being connected with a resistor R9 in series, and the third path of the CE pin is connected with the CHRG pin of the power management chip after being connected with a resistor R1 in series; the BAT pin of the power management chip is connected to the battery and the power switching circuit. The current of the charging circuit can reach 1A.

Preferably, the charging circuit further comprises an LED light emitting chip LED1 and an LED light emitting chip LED3, the LED light emitting chip LED1 is connected in series between the CE pin of the power management chip and the resistor R9, and the LED light emitting chip LED3 is connected in series between the CHRG pin of the power management chip and the resistor R1, the LED light emitting chip LED1 is used as a warning light for battery full charge, and the LED light emitting chip LED3 is used as a warning light for battery charging.

The multifunctional multimeter further comprises a buzzer (a loudspeaker) electrically connected with the processing chip and used for voice prompt. The display circuit is an OLED display circuit, and the OLED display circuit is realized by adopting an OLED display screen using IIC communication. The LED lighting circuit comprises an LED lamp and a PMOS high-current driver for driving the LED lamp.

The processing chip is realized by adopting a single chip microcomputer, a 51 single chip microcomputer can be used, only a 12-bit ADC analog-to-digital converter is provided, and only one ADC is used. Preferably, the processing chip is realized by a chip with model number STC15W408 AS.

Through the circuit design, the multifunctional multimeter has the advantages of practicality, simplicity and portability, and meanwhile, during design, the measurement voltage of the multifunctional multimeter is lower than 36V (for life safety, most of the voltage of a machine table is enough to DC 24V). In addition, the multifunctional multimeter is provided with an LED lighting circuit, an OLED display circuit and an IC for open-short circuit measurement, so that the purpose of testing personnel is greatly facilitated. Meanwhile, the multifunctional multimeter is reserved with an interface, so that more functions can be conveniently upgraded subsequently.

Drawings

The invention may be better understood by referring to the following description in conjunction with the accompanying drawings, in which like reference numerals are used to designate like or similar parts throughout the figures thereof. The accompanying drawings, which are incorporated in and form a part of this specification, illustrate preferred embodiments of the present invention and, together with the detailed description, serve to explain the principles and advantages of the invention. In the drawings:

FIG. 1 is a block diagram of a multi-function multimeter of the present invention;

FIG. 2 is a schematic circuit diagram of the multi-functional multimeter of the present invention.

Detailed Description

Embodiments of the present invention will be described below with reference to the accompanying drawings. Elements and features described in one drawing or one embodiment of the invention may be combined with elements and features shown in one or more other drawings or embodiments. It should be noted that the figures and descriptions have omitted, for the sake of clarity, the representation and description of components and processes that are not relevant to the present invention and known to those of ordinary skill in the art. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As a specific example, refer to fig. 1, the utility model discloses a multifunctional multimeter, it is including handling chip, power control module, LED lighting circuit, infrared laser circuit, gear and range switching circuit, bee calling organ and OLED display circuit all with handle chip electric connection. In addition, the multifunctional multimeter can also comprise keys, so that the multifunctional multimeter is further convenient for users to operate. Through the proposal, the utility model discloses a LED lighting circuit as the flashlight for the infrared laser circuit that guides to and purpose-built gear and range switching circuit, the product IC's of being convenient for measurement, convenient maintenance and pointing. In addition, the multimeter of this application has used the singlechip to draw commonly used functional module (like ADC analog-to-digital converter), and the measurement voltage design is 36V. Meanwhile, the display circuit displays the Chinese character by using the OLED, and a 128-by-32 pixel dot matrix screen can display the Chinese character (supports screen brightness adjustment).

As a specific implementation scheme, referring to fig. 2, the processing chip is implemented by using a single chip, and may use a 51-chip, with only a 12-bit ADC analog-to-digital converter, and only one ADC. Preferably, the processing chip is realized by a chip with model number STC15W408 AS.

The power control module comprises a charging circuit, a battery, a USB power supply, a battery and a power switching circuit, wherein the USB power supply is realized by using a MICRO interface (android interface), not only can be charged, but also can be burned into a program.

In addition, the charging circuit further comprises an LED light-emitting chip LED1 and an LED light-emitting chip LED3, the LED light-emitting chip LED1 is connected between the CE pin of the power management chip and the resistor R9 in series, the LED light-emitting chip LED3 is connected between the CHRG pin of the power management chip and the resistor R1 in series, the LED light-emitting chip LED1 serves as a prompting lamp for battery charging, and the LED light-emitting chip LED3 serves as a prompting lamp for battery charging.

Because maintenance at ordinary times, manual test products etc. need the flashlight illumination, therefore increased LED lighting circuit (can use PWM to adjust light luminance, drive LED with PMOS) on the special multimeter of this application. The LED lighting circuit comprises an LED lamp for lighting and a PMOS high-current driving module for driving.

The gear and range switching circuit is used for switching modes, wherein the modes comprise a voltage drop measurement mode, a voltage measurement mode and the like. The gear and range switching circuit comprises a relay K1, a relay K2, a resistor R2, a resistor R3, a resistor R4, a resistor R6, a resistor R7 and a resistor R8, wherein a 1 st pin of the relay K1 is connected with a power supply VCC, one path of a 2 nd pin of a relay K1 is connected with a 6 th pin of the relay K2, and the other path of the 2 nd pin of the relay K1 is connected with a 5 th pin of the relay K1; one path of a 3 rd pin of the relay K1 is connected with the resistor R2 in series and then connected to the processing chip, and the other path of the 3 rd pin is connected with the resistor R4 and the MOS transistor Q1 in series and then connected to the power supply VCC; the first path of the 4 th pin of the relay K1 is connected with the 3 rd pin of the relay K2 after being connected with the resistor R6 in series, the second path is connected with the 7 th pin of the relay K1, and the third path is grounded; one path of a 6 th pin of the relay K1 is connected in series with the resistor R3 and then is connected to the processing chip, and the other path is grounded; the 8 th pin of the relay K1 is connected to the processing chip; the 1 st pin of the relay K2 is connected with a power supply VCC, the 2 nd pin of the relay K2 is connected with the first end of a resistor R7 and the 7 th pin of the relay K2, the second end of the resistor R7 is connected with a resistor R8 and the 5 th pin of the relay K2, and the 8 th pin of the relay K2 is connected with a processing chip. In the embodiment, the relay K1 and the relay K2 both adopt the relays with the model number of TQ2-5V to realize the gear switching of the two-way switch. Through above-mentioned circuit, its gear is changed and is used the relay to change, has the advantage of simple easily realizing.

The buzzer is used for voice prompt. The OLED display circuit is realized by adopting an OLED display screen (using IIC communication).

Considering that the diode voltage difference is not used frequently at most in practical use, common functions are integrated together, the voltage is below 36V (for life safety, most of the machine station voltage is enough to be DC 24V), the OS test (diode voltage difference, also called open short circuit test (buzzer)) is realized by pulling up 10K resistance, and the current changes according to the battery voltage change (4.2V/10K equals 420uA), which is enough for common product measurement.

In the foregoing description of specific embodiments of the invention, features described and/or illustrated with respect to one embodiment may be used in the same or similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, elements, steps or components, but does not preclude the presence or addition of one or more other features, elements, steps or components.

In the above embodiments and examples, numerical reference numerals have been used to indicate various steps and/or elements. It will be appreciated by those of ordinary skill in the art that these reference numerals are merely for convenience of description and drawing and do not denote any order or any other limitation.

Furthermore, the method of the present invention is not limited to be performed in the time sequence described in the specification, and may be performed in other time sequences, in parallel, or independently. Therefore, the order of execution of the methods described in this specification does not limit the technical scope of the present invention.

While the present invention has been disclosed above by the description of specific embodiments thereof, it should be understood that all of the embodiments and examples described above are illustrative and not restrictive. Various modifications, improvements or equivalents to the invention may be devised by those skilled in the art within the spirit and scope of the appended claims. Such modifications, improvements and equivalents are also intended to be included within the scope of the present invention.

Claims

1. A multifunctional multimeter, comprising: the intelligent LED power supply comprises a processing chip, a power supply control module, an LED lighting circuit, an infrared laser circuit, a gear and range switching circuit and a display circuit, wherein the power supply control module, the LED lighting circuit, the infrared laser circuit, the gear and range switching circuit and the display circuit are all electrically connected with the processing chip; the gear and the range switching circuit are realized by matching two relays.

2. The multi-function multimeter of claim 1, wherein: the gear and range switching circuit comprises a relay K1, a relay K2, a resistor R2, a resistor R3, a resistor R4, a resistor R6, a resistor R7 and a resistor R8, wherein a 1 st pin of the relay K1 is connected with a power supply VCC, one path of a 2 nd pin of the relay K1 is connected with a 6 th pin of the relay K2, and the other path of the 2 nd pin of the relay K1 is connected with a 5 th pin of the relay K1; one path of a 3 rd pin of the relay K1 is connected with the resistor R2 in series and then connected to the processing chip, and the other path of the 3 rd pin is connected with the resistor R4 and the MOS transistor Q1 in series and then connected to the power supply VCC; the first path of the 4 th pin of the relay K1 is connected with the 3 rd pin of the relay K2 after being connected with the resistor R6 in series, the second path is connected with the 7 th pin of the relay K1, and the third path is grounded; one path of a 6 th pin of the relay K1 is connected in series with the resistor R3 and then is connected to the processing chip, and the other path is grounded; the 8 th pin of the relay K1 is connected to the processing chip; the 1 st pin of the relay K2 is connected with a power supply VCC, the 2 nd pin of the relay K2 is connected with the first end of a resistor R7 and the 7 th pin of the relay K2, the second end of the resistor R7 is connected with a resistor R8 and the 5 th pin of the relay K2, and the 8 th pin of the relay K2 is connected with a processing chip.

3. The multi-function multimeter of claim 1 or 2, wherein: the power control module comprises a charging circuit, a battery, a USB power supply and a battery and power switching circuit, wherein the USB power supply is realized by using a MICRO interface, and the battery and power switching circuit are used for selecting the battery or the USB power supply to supply power for the processing chip.

4. The multi-function multimeter of claim 3, wherein: the charging circuit comprises a power management chip, a capacitor C1, a resistor R1, a resistor R9 and a resistor R10, wherein the power management chip is realized by a TP4056 power management IC, a TEMP pin, an EP pin and a GND pin of the power management chip are grounded, and a PROG pin of the power management chip is grounded after being connected with the resistor R10 in series; one path of a VCC pin of the power management chip is connected with a 5V power supply, and the other path of the VCC pin of the power management chip is connected with a capacitor C1 in series and then is grounded; the first path of the CE pin of the power management chip is connected with a 5V power supply, the second path of the CE pin is connected with the STDBY pin of the power management chip after being connected with a resistor R9 in series, and the third path of the CE pin is connected with the CHRG pin of the power management chip after being connected with a resistor R1 in series; the BAT pin of the power management chip is connected to the battery and the power switching circuit.

5. The multi-function multimeter of claim 3, wherein: the charging circuit further comprises an LED light-emitting chip LED1 and an LED light-emitting chip LED3, the LED light-emitting chip LED1 is connected between a CE pin of the power management chip and the resistor R9 in series, the LED light-emitting chip LED3 is connected between a CHRG pin of the power management chip and the resistor R1 in series, the LED light-emitting chip LED1 serves as a prompting lamp for battery charging, and the LED light-emitting chip LED3 serves as a prompting lamp for battery charging.

6. The multi-function multimeter of claim 1, wherein: the multifunctional multimeter further comprises a buzzer electrically connected with the processing chip and used for voice prompt.

7. The multi-function multimeter of claim 1, wherein: the display circuit is an OLED display screen using IIC communication.

8. The multi-function multimeter of claim 1, wherein: the processing chip is realized by adopting a single chip microcomputer.

9. The multi-function multimeter of claim 1, wherein: the processing chip is realized by adopting a chip with the model STC15W408 AS.