CN212780955U - Touch type intelligent digital multi-purpose meter - Google Patents

Abstract

The utility model relates to the technical field of multimeters, and discloses a touch type intelligent digital multimeter, which comprises a shell, an LCD touch display screen and a lithium battery module, wherein the LCD touch display screen is embedded above the upper end wall of the shell, an A/D conversion circuit, a power supply circuit, a touch circuit, an attenuation circuit, an MCU control circuit and an LCD drive circuit are arranged in the shell and are respectively and electrically connected with the A/D conversion circuit, the A/D conversion circuit comprises an A/D conversion chip, the A/D conversion chip is provided with a signal input port VR, the touch circuit comprises a touch chip, the MCU control circuit comprises an MCU chip, and the touch chip is electrically connected with the MCU chip. The technical scheme of the utility model direct with the form of digit show the measured value on the display screen, it is more convenient to read, the degree of accuracy is high, the practicality is strong.

Description

Touch type intelligent digital multi-purpose meter

Technical Field

The utility model relates to an universal meter technical field, in particular to touch type intelligence digital multimeter.

Background

Multimeters, also known as multiplex meters, multi-purpose meters, triple meters, multi-purpose meters, etc., are indispensable measurement instruments for power electronics and other departments, and generally aim to measure voltage, current and resistance. The multimeter can be used for measuring the resistance, alternating current and direct current voltages of an object to be measured, and can also be used for measuring direct current voltages, and even some multimeters can also be used for measuring main parameters of a transistor, the capacitance of a capacitor and the like.

However, most of the existing multimeters adopt a pointer measuring instrument to read, the measured value is read by the indication of a meter head pointer, the operation is complex, the efficiency is low, the reading is not visual enough, and the error is easy to occur in the reading of the numerical value.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a touch-type intelligence digit multimeter aims at solving the measuring instrument that current multimeter adopted the pointer and reads, and the measured value is read by the gauge outfit pointer instruction, complex operation, and is inefficient, and the reading is directly perceived inadequately, reads the technical problem that numerical value appears the error easily.

In order to achieve the above object, the utility model provides a touch-type intelligent digital multimeter, which comprises a casing, a LCD touch display screen and a lithium battery module, wherein the LCD touch display screen is embedded in the upper end wall of the casing, a power switch key and a pen-shape pen jack are arranged below the upper end wall of the casing, the lithium battery module is arranged in the casing, an A/D conversion circuit and a power circuit, a touch circuit, an attenuation circuit, a MCU control circuit and a LCD driving circuit which are respectively and electrically connected with the A/D conversion circuit are arranged in the casing, the A/D conversion circuit comprises an A/D conversion chip, the A/D conversion chip is provided with a signal input port VR for receiving input signals, the transmitting and receiving ports of the A/D conversion chip are pins P31 and P30, the power circuit is electrically connected with pins VDD and VSS of the A/D conversion chip, the power supply circuit is used for providing power supply required by work; the touch circuit comprises a touch chip, the MCU control circuit comprises an MCU chip, the touch chip is electrically connected with the MCU chip, the LCD touch display screen is electrically connected with the LCD drive circuit, and the LCD touch display screen is driven by the LCD drive circuit to display a measured value.

Further, the A/D conversion chip adopts an SD7501 chip, the touch chip adopts a CA51F551S3 chip, and the MCU chip adopts an HC32L136K8TA chip.

Furthermore, the A/D conversion chip is respectively connected with a transmitting pin 5 and a receiving pin 6 RXD of the MCU chip through a transmitting pin 36 and a receiving pin 35 RXD.

Further, a 5-pin P3.0 of the touch chip is connected with a 62-pin RXD0 of the MCU chip.

Furthermore, the pin RXD0 of the MCU chip is in one-way connection with the pin P3.0 of the touch chip, and the pin 6 and the pin 5 of the MCU chip are in two-way connection with the pin 36 and the pin 35 of the A/D conversion chip respectively.

Adopt the technical scheme of the utility model, following beneficial effect has: the technical scheme of the utility model, the mode that traditional universal meter adopted the gauge outfit pointer to instruct to read has been changed, high durability and convenient use, and is simple in operation, circuit structure is reasonable, through AD conversion chip's discernment, can automatic identification AC and DC voltage, the resistance function, also can manually switch to voltage or electric capacity function, electric field measurement, zero live wire measurement all can be switched by touch button and measure, inside can realize the uninterrupted power function of operation, show the measured value through LCD touch display screen, direct form with the figure shows, it is more convenient to read, the degree of accuracy is high, therefore, the clothes hanger is strong in practicability, can be extensive use in ammeter measurement, fields such as electronic scale and counter.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic diagram of an overall structure of a touch-type intelligent digital multimeter according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a frame connection structure of a touch-type intelligent digital multimeter according to an embodiment of the present invention;

fig. 3 is a schematic diagram of an MCU control circuit of the touch type intelligent digital multimeter according to an embodiment of the present invention;

fig. 4 is a schematic diagram of an a/D conversion circuit of a touch-type intelligent digital multimeter according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a touch circuit of a touch-type intelligent digital multimeter according to an embodiment of the present invention.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a touch type intelligence digit multimeter.

As shown in fig. 1 to 5, in an embodiment of the present invention, the touch-type intelligent digital multimeter comprises a casing 100, an LCD touch screen 200 and a lithium battery module (not shown), wherein the LCD touch screen 200 is embedded above an upper end wall of the casing 100, a power switch button 101 and a pen-type pen socket 102 are arranged below the upper end wall of the casing 100, the lithium battery module is arranged in the casing 100, an a/D conversion circuit 20 and a power circuit 30, a touch circuit 40, an attenuation circuit 50, an MCU control circuit 60 and an LCD driving circuit 70 are arranged in the casing 100, the a/D conversion circuit 20 includes an a/D conversion chip, the a/D conversion chip has a signal input port VR for receiving an input signal, the transmitting and receiving ports of the A/D conversion chip are pins P31 and P30, the power supply circuit 30 is electrically connected with pins VDD and VSS of the A/D conversion chip, and the power supply circuit 30 is electrically connected with the lithium battery module and used for providing power supply required by work; the touch circuit 40 comprises a touch chip, the MCU control circuit 60 comprises an MCU chip, the touch chip is electrically connected with the MCU chip, the LCD touch display screen 10 is electrically connected with the LCD drive circuit 70, and the LCD touch display screen 10 is driven by the LCD drive circuit 70 to display a measured value.

Specifically, the A/D conversion chip adopts an SD7501 chip, the touch chip adopts a CA51F551S3 chip, and the MCU chip adopts an HC32L136K8TAMCU chip.

Specifically, when the voltage is low, the field effect transistor Q2 is turned on, one path supplies voltage to the a/D (SD7501) for operation, the other path supplies power voltage to the HX4004 for 5V boosting, and then the voltage is supplied to the MCU (HC32L136K8TA), the magnetic latching relay, the backlight, and the buzzer for driving.

Specifically, the a/D conversion chip (SD7501) is connected with the transmitting pin 5 and the receiving pin 6 RXD of the MCU chip (HC32L136K8TA) through the transmitting pin 36 and the receiving pin 35 RXD, and signals are bidirectionally transmitted through the two pins; signals at the VR input end enter an A/D (SD7501) after being switched by an attenuator and a magnetic latching relay, are converted by the A/D (SD7501) and then are transmitted to an MCU (HC32L136K8TA) to drive the LCD touch display screen to display, and signals received by the MCU (HC32L136K8TA) are also received and transmitted to an A/D conversion chip (SD7501) to drive the LCD touch display screen to work.

Specifically, a5 pin P3.0 of a touch chip (CA51F551S3) is connected with a 62 pin RXD0 of an MCU chip (HC32L136K8TA) for biphase transmission, P0.2, P3.2, P3.3 and P3.4 are touch switch input pins, and the functions are long-press power on/off, electric field induction/zero line judgment, flashlight lamp switch and latch/backlight lamp switch respectively; these pin functions are transmitted to the MCU chip (HC32L136K8TA) RXD0 via the transmit port P3.0 to enable control of the functions.

Specifically, touch button intelligence light control (D4, D5, D6, D7), when power is opened, 4 are for lighting up, light up the silk screen button on the panel, the button at this moment is the on-state, if 7 seconds have not had button operation, 4 lamps are the off-state. When the MCU chip (HC32L136K8TA) continuously switches data and transmits the data to the 16 pin of the touch chip (CA51F551S3) through the PD05 without turning off the output power of P0.1, so that the MCU chip (HC32L136K8TA) and the A/D conversion chip (SD7501) are always in a working state, no shutdown condition exists, only when a user stops using the MCU chip (HC32L136K8TA) does not switch data, the MCU chip (HC32L136K8TA) transmits the data to the 16 pin of the touch chip (CA51F551S3) through the PD05 pin, and after 5 minutes, P0.1 stops outputting high level except the touch chip (CA51F551S 3).

Specifically, one path of a VR input signal enters an a1 port of an a/D conversion chip (SD7501) after passing through attenuators R7 and R8, the other path of the VR input signal is connected with a pin 5 of a magnetic latching relay through R24, when the voltage is lower than 0.8V, the a/D conversion chip (SD7501) judges that the voltage is low, the default is resistance measurement, at this time, PT23 and PT21 output low and high levels respectively, T6 and T4 are controlled to be in a conducting state, a pin 8 and a pin 1 of the magnetic latching relay are respectively connected with positive electricity and negative electricity, at this time, a pin 3 and a pin 4 of the relay, a pin 5 and a pin 6 are in a short circuit state, and in order to make the chip in a low power consumption state, at this time, PT20 and PT24 are

Specifically, the low and high levels are reversely input to cut off the T3 and the T5, the 5 pin and the 6 pin of the relay are conducted in the resistance measurement state, the measurement signal enters A5, and if the high voltage is input by mistake, the PTC thermistor and the T1 are connected, and the T2 plays a role in protection. When the voltage is higher than 0.8V, PT20 and PT24 output high and low levels, T3 and T5 are switched on to output negative and positive voltages, pins 8 and 1 of the magnetic latching relay obtain opposite voltages, pins 5 and 6 are disconnected with pins 3 and 4 at the moment, the port A5 is in a disconnected state, the high voltage is attenuated by R7 and R8 and enters the port A1, the PT23 and PT21 output low and high levels at the moment, and the T6 and T4 are in a disconnected state.

Specifically, the 62 pin RXD0 of the MCU chip (HC32L136K8TA) is unidirectionally connected with the 5 pin P3.0 of the touch chip (CA51F551S3), the 6 pin and the 5 pin of the MCU chip (HC32L136K8TA) are respectively bidirectionally connected with the 36 pin and the 35 pin of the A/D conversion chip (SD7501), the driving of the backlight and the LCD touch display screen is completed by the MCU chip (HC32L136K8TA),

specifically, the utility model discloses traditional universal meter has been changed and has adopted the mode that the gauge outfit pointer instruction read, high durability and convenient use, and is simple in operation, circuit structure is reasonable, through the discernment of AD conversion chip, can automatic identification AC and DC voltage, the resistance function, also can manually switch to voltage or electric capacity function, electric field measurement, zero live wire measurement all can be switched by touch key and measure, inside can realize the uninterrupted power function of operation, show the measured value through LCD touch display screen, direct form with the figure shows, it is more convenient to read, the degree of accuracy is high, therefore, the clothes hanger is strong in practicability, can be extensive use in the ammeter measurement, fields such as electronic scale and counter.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims (5)

1. A touch type intelligent digital multimeter is characterized by comprising a shell, an LCD touch display screen and a lithium battery module, wherein the LCD touch display screen is embedded above the upper end wall of the shell, a power switch key and a meter pen jack are arranged below the upper end wall of the shell, the lithium battery module is arranged in the shell, an A/D conversion circuit, a power circuit, a touch circuit, an attenuation circuit, an MCU control circuit and an LCD drive circuit are arranged in the shell and are respectively and electrically connected with the A/D conversion circuit, the A/D conversion circuit comprises an A/D conversion chip, the A/D conversion chip is provided with a signal input port VR used for receiving input signals, the transmitting and receiving ports of the A/D conversion chip are pins P31 and P30, and the power circuit is electrically connected with VDD and VSS pins of the A/D conversion chip, the power circuit is electrically connected with the lithium battery module and is used for providing power required by work; the touch circuit comprises a touch chip, the MCU control circuit comprises an MCU chip, the touch chip is electrically connected with the MCU chip, the LCD touch display screen is electrically connected with the LCD drive circuit, and the LCD touch display screen is driven by the LCD drive circuit to display a measured value.

2. The touch type smart digital multimeter of claim 1, wherein the A/D conversion chip is an SD7501 chip, the touch chip is a CA51F551S3 chip, and the MCU chip is an HC32L136K8TA chip.

3. The touch type intelligent digital multimeter according to claim 1, wherein the a/D conversion chip is connected to the transmitting pin 5 and the receiving pin 6 RXD of the MCU chip by a transmitting pin 36 and a receiving pin 35 RXD, respectively.

4. The touch intelligent digital multimeter of claim 1, wherein the 5-pin P3.0 of the touch chip is connected to the 62-pin RXD0 of the MCU chip.

5. The touch type intelligent digital multimeter according to claim 1, wherein the pin RXD0 of the MCU chip is unidirectionally connected to the pin P3.0 of the touch chip, and the pins 6 and 5 of the MCU chip are bidirectionally connected to the pins 36 and 35 of the a/D conversion chip, respectively.

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