CN214480546U

CN214480546U - Pulse level automatic conversion and signal acquisition circuit and equipment

Info

Publication number: CN214480546U
Application number: CN202023032574.7U
Authority: CN
Inventors: 黄强
Original assignee: Shanghai Tongli Information Technology Co ltd
Current assignee: Shanghai Tongli Information Technology Co ltd
Priority date: 2020-12-16
Filing date: 2020-12-16
Publication date: 2021-10-22
Anticipated expiration: 2030-12-16

Abstract

The utility model provides a pulse level automatic switch and signal acquisition circuit, including signal input module, energy storage module, signal conversion module and signal acquisition module, signal input module is connected with energy storage module and signal conversion module, signal acquisition module is connected with signal conversion module, the utility model provides a pair of pulse level automatic switch and signal acquisition circuit have the effect that can both change and gather to the pulse signal of different voltage ranges.

Description

Pulse level automatic conversion and signal acquisition circuit and equipment

Technical Field

The utility model relates to an electronic circuit's technical field specifically, relates to a pulse level automatic switch and signal acquisition circuit and equipment.

Background

In many devices, especially in the devices in the vehicle-mounted industry, a pulse signal acquisition circuit is often used to acquire information of the device, such as pulse frequency, duty ratio, etc., so as to acquire device information, such as rotating speed, vehicle speed, etc.

Generally, a device for sending a pulse signal and a signal acquisition device are not in a power domain, the pulse signal and the voltage of the acquisition device have the possibility of incompatibility, pulse level conversion processing is needed, and conventional solutions include:

SUMMERY OF THE UTILITY MODEL

To the defect among the prior art, the utility model aims at providing a pulse level automatic switch and signal acquisition circuit and equipment.

According to the utility model provides a pair of pulse level automatic switch and signal acquisition circuit, including signal input module, energy storage module, signal conversion module and signal acquisition module, signal input module is connected with energy storage module and signal conversion module, signal acquisition module is connected with signal conversion module.

Preferably, the signal input module comprises a signal source V1, one end of the signal source V1 is grounded, and the other end of the signal source V1 is connected to the energy storage module and the signal conversion module.

Preferably, the energy storage module includes a diode D1, an anode terminal of the diode D1 is connected to the signal source V1 and the signal conversion module, a cathode of the diode D1 is electrically connected to a capacitor C1, and the other end of the capacitor C1 is grounded.

Preferably, the signal conversion module includes a resistor R1, one end of the resistor R1 is connected to an anode of the diode D1 and the signal source V1, the other end of the resistor R1 is electrically connected to a transistor Q1, an emitter of the transistor Q1 is connected to a capacitor C1 and a cathode of the diode D1, a base of the transistor Q1 is connected to the resistor R1, a collector of the transistor Q1 is electrically connected to the resistor R2, the other end of the resistor R2 is electrically connected to the transistor Q2, an emitter of the transistor Q2 is grounded, a base of the transistor Q2 is connected to the resistor R2, a collector of the transistor Q2 is electrically connected to the resistor R3, and the other end of the resistor R3 is electrically connected to the dc power supply VDD.

Preferably, the signal acquisition module includes a central control chip MCU, the central control chip MCU includes a VDD pin and a GPIO pin, the VDD pin is connected to the resistor R3 and the dc power supply VDD, and the GPIO pin is connected to one end of the resistor R3, which is far away from the dc power supply VDD, and a collector of the transistor Q2.

The utility model also provides an equipment, equipment includes the circuit in the above-mentioned.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. pulse signals in different voltage ranges can be converted and collected;

2. the pulse level is automatically converted without manually presetting level conversion voltage;

3. the implementation scheme is simple and the cost is low.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

fig. 1 is a circuit diagram of a pulse level automatic switching and signal acquisition circuit provided by the present invention;

fig. 2 is a front-back comparison diagram of the pulse waveform of the present invention.

Detailed Description

The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.

According to the utility model provides a pair of pulse level automatic switch and signal acquisition circuit, refer to fig. 1 and fig. 2, include: the charging element comprises a diode D1, a capacitor C1 of an energy storage element, a PNP triode Q1 of a signal conversion element, an NPN triode Q2, resistors R1, R2 and R3, a signal acquisition element MCU and a signal source V1 for simulating a pulse signal output by external equipment.

The anode of the charging element diode D1 is connected to an external pulse signal, and the cathode is connected to the energy storage element capacitor C1. The partial circuit realizes the energy collection of the pulse signal by utilizing the unidirectional conductivity of the diode and the energy storage characteristic of the capacitor. At the beginning, after the short storage, the voltage of the capacitor C1 can be maintained in a voltage range close to the high level amplitude of the pulse signal, and the voltage varies with the amplitude of the pulse signal. The energy stored in the capacitor C1 is used to provide the driving voltage and current for the subsequent circuits.

PNP triode Q1, NPN triode Q2, resistance R1, R2 and R3 constitute the signal conversion circuit.

According to the switching characteristic of the PNP transistor Q1, when the input pulse signal, i.e. point a on the graph, is at the low level of the pulse signal, no matter the low level amplitude is 0V or other half-high voltage, for example, 5V, as long as there is a certain voltage difference between the voltage and the high level voltage of the pulse signal, at this time, the emitter of the PNP transistor Q1 is biased forward, Q1 is turned on, the current of the capacitor C1 passes through the PNP transistor Q1 and then through the current-limiting resistor R2 to drive the NPN transistor Q2 to be saturated and turned on, the collector of the Q2, i.e. point F on the graph, is pulled down to 0V, which realizes the level automatic conversion of any pulse low level voltage to 0V voltage.

When the input pulse signal, namely point A on the graph is at the high level of the pulse signal, the emitter of the PNP triode Q1 is reversely biased, the Q1 is cut off, the current of the capacitor C1 cannot flow through the Q2 and the resistor R2, the NPN triode Q2 is in a cut-off state, and the collector of the Q2, namely point F on the graph, is pulled up to VDD by the resistor R3, so that the level automatic conversion of any pulse high-level voltage to VDD voltage is realized.

After passing through the pulse level automatic switching circuit, the high and low levels of the pulse signals are respectively switched to VDD and 0V, the voltage amplitude of the switched pulse signals is consistent with the voltage range of the MCU of the acquisition main control chip, and the MCU can correctly read the pulse signals and then carry out subsequent operation or processing to obtain related information.

Referring to fig. 2, the pulse waveforms of the present invention are compared with each other, the upper waveform is a pulse input signal of 5-12V, and the lower waveform is a converted signal of 0-3.3V.

Through the technical scheme, the utility model can convert and collect pulse signals in different voltage ranges; when the pulse level is automatically converted, the level conversion voltage does not need to be manually preset; and the implementation scheme is simple and the cost is low.

In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims

1. A pulse level automatic conversion and signal acquisition circuit is characterized by comprising a signal input module, an energy storage module, a signal conversion module and a signal acquisition module, wherein the signal input module is connected with the energy storage module and the signal conversion module;

the signal conversion module comprises a resistor R1, one end of the resistor R1 is connected with the anode of a diode D1 and a signal source V1, the other end of the resistor R1 is electrically connected with a triode Q1, the emitter of a triode Q1 is connected with a capacitor C1 and the cathode of the diode D1, the base of a triode Q1 is connected with the resistor R1, the collector of the triode Q1 is electrically connected with the resistor R2, the other end of the resistor R2 is electrically connected with a triode Q2, the emitter of the triode Q2 is grounded, the base of the triode Q2 is connected with the resistor R2, the collector of the triode Q2 is electrically connected with a resistor R3, and the other end of the resistor R3 is electrically connected with a direct current power supply VDD.

2. The automatic pulse level converting and signal collecting circuit as claimed in claim 1, wherein the signal input module comprises a signal source V1, one end of the signal source V1 is connected to ground, and the other end of the signal source V1 is connected to the energy storage module and the signal converting module.

3. The automatic pulse level converting and signal acquiring circuit as claimed in claim 1, wherein the energy storage module comprises a diode D1, an anode terminal of the diode D1 is connected to the signal source V1 and the signal converting module, a cathode of the diode D1 is electrically connected to a capacitor C1, and the other terminal of the capacitor C1 is grounded.

4. The automatic pulse level conversion and signal acquisition circuit of claim 1, wherein the signal acquisition module comprises a central control chip MCU, the central control chip MCU comprises a VDD pin and a GPIO pin, the VDD pin is connected with a resistor R3 and a direct current power supply VDD, and the GPIO pin is connected with one end of a resistor R3 far away from the direct current power supply VDD and a collector of a transistor Q2.

5. An apparatus, characterized in that the apparatus comprises a circuit according to any one of claims 1-4.