CN214281253U - Power supply detection circuit based on digital isolation - Google Patents
Power supply detection circuit based on digital isolation Download PDFInfo
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- CN214281253U CN214281253U CN202120143800.4U CN202120143800U CN214281253U CN 214281253 U CN214281253 U CN 214281253U CN 202120143800 U CN202120143800 U CN 202120143800U CN 214281253 U CN214281253 U CN 214281253U
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Abstract
The utility model relates to a power detection circuit based on digit is kept apart, include: the device comprises a voltage stabilizing module, a digital isolation module and an MCU control module; the voltage stabilizing module is connected with an input power supply to convert the input power supply into stable direct-current voltage; the power pin and the input pin at the front end of the digital isolation module are respectively connected with the voltage stabilizing module; the output pin at the rear end of the digital isolation module is connected with the MCU control module, and the MCU control module judges whether the input power supply is electrified or not according to the high-low level output by the output pin at the rear end of the digital isolation module; when the input power supply is an alternating-current input power supply, the power supply detection circuit based on digital isolation further comprises a rectification module; the input power supply is connected with the voltage stabilizing module through the rectifying module. The utility model discloses can realize detecting the isolation of handing over/direct current input power state, detection circuitry is simple and with low costs, and the testing result is reliable and stable.
Description
Technical Field
The utility model relates to a power detects technical field, especially a power detection circuit based on digit is kept apart.
Background
With the rapid development of modern electronic technology, the market demand for the intellectualization of various electrical devices is more and more urgent, and in most applications, it is necessary to perform state isolation detection on an ac/dc power supply in a system to determine whether the system is normally powered or is in an on/off state. The traditional isolation detection methods for power supply are mainly divided into two types. One type is that the voltage is isolated and reduced by a transformer, and then the voltage is stabilized and filtered, and the voltage is provided for a microcontroller for detection. The other type is that the power state isolation detection is finished by directly utilizing a voltage current sensor, although the detection mode circuit is simple, the price of the sensor is expensive generally, and the large-scale production is not facilitated.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides a power detection circuit based on digit is kept apart, can realize the isolation detection to the AC/DC input power state, and detection circuit is simple and with low costs, and the testing result is reliable and stable.
The utility model adopts the following technical scheme:
a digital isolation based power detection circuit comprising: the device comprises a voltage stabilizing module, a digital isolation module and an MCU control module; the voltage stabilizing module is connected with an input power supply to convert the input power supply into stable direct-current voltage; the power pin and the input pin at the front end of the digital isolation module are respectively connected with the voltage stabilizing module; the output pin at the rear end of the digital isolation module is connected with the MCU control module, and the MCU control module judges whether the input power supply is electrified or not according to the high-low level output by the output pin at the rear end of the digital isolation module; when the input power supply is an alternating-current input power supply, the power supply detection circuit based on digital isolation further comprises a rectification module; the input power supply is connected with the voltage stabilizing module through the rectifying module.
Preferably, the power detection circuit based on digital isolation further includes: a resistor; when the input power supply is an alternating current input power supply, the input power supply is connected with the voltage stabilizing module through a rectifying module and a resistor which are connected in series; when the input power supply is a direct-current input power supply, the input power supply is connected with the voltage stabilizing module through the resistor.
Preferably, the rectifying module comprises a rectifying diode; the anode of the rectifier diode is connected with the input power supply; and the cathode of the rectifier diode is connected with the voltage stabilizing module.
Preferably, the voltage stabilizing module comprises a voltage stabilizing diode; the cathode of the voltage stabilizing diode is respectively connected with the power pin and the input pin at the front end of the digital isolation module; and the anode of the voltage stabilizing diode is connected with the grounding pin at the front end of the digital isolation module.
Preferably, the digital isolation module comprises a single-channel digital isolation chip.
Preferably, the power detection circuit based on digital isolation further includes: the front-end filtering module is used for filtering the output of the voltage stabilizing module; the front-end filtering module comprises a capacitor, or two or more capacitors connected in parallel.
Preferably, a power pin at the rear end of the digital isolation module is connected with a direct current power supply; the direct current power supply is also connected with the MCU control module to supply power.
Preferably, the power detection circuit based on digital isolation further includes: the rear-end filtering module is used for filtering the direct-current power supply; the end filtering module comprises a capacitor, or two or more capacitors connected in parallel; one end of the rear-end filtering module is connected with the direct-current power supply, and the other end of the rear-end filtering module is connected with a grounding pin at the rear end of the digital isolation module.
Compared with the prior art, the beneficial effects of the utility model are as follows:
the utility model can realize the isolation detection of the AC/DC input power state through the voltage stabilizing module, the digital isolation module and the MCU control module, the detection circuit is simple and has low cost, and the detection result is stable and reliable;
the utility model discloses a when the input power is AC input power, the input power reaches the stabilivolt after rectifier diode and resistance partial pressure, after handling through zener diode and filter capacitance, provide power foot and input foot of digital isolation module front end, when there is AC input power input at the front end, the output foot output high level of digital isolation module rear end gives MCU control module, when there is not AC input power input at the front end, the output foot output low level of digital isolation module rear end gives MCU control module;
the utility model discloses an when input power supply is direct current input power supply, input power supply is after resistance partial pressure, reach the stabilivolt, handle the back through zener diode and filter capacitance, provide the power foot and the input foot of digital isolation module front end, when the front end has direct current power supply input, the output foot output high level of digital isolation module rear end gives MCU control module, when the front end does not have direct current power supply input, the output foot output low level of digital isolation module rear end gives MCU control module.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention can be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following description lists the embodiments of the present invention.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Fig. 1 is a block diagram of a first embodiment of the present invention;
fig. 2 is a circuit diagram of a first embodiment of the present invention;
fig. 3 is a block diagram of a second embodiment of the present invention;
fig. 4 is a circuit diagram of a second embodiment of the present invention.
Detailed Description
In order to make the technical solution and advantages of the present invention more clearly understood, the following description is given with reference to the accompanying drawings and embodiments,
the present invention will be described in further detail. It should be understood that the embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of the invention.
For simplicity and clarity of description, the aspects of the present invention are described below by describing several representative embodiments. Numerous details of the embodiments are set forth to provide an understanding of the principles of the invention. It is clear, however, that the solution according to the invention can be implemented without being limited to these details. Some embodiments are not described in detail, but rather only to give a framework, in order to avoid unnecessarily obscuring aspects of the present invention. Hereinafter, "including" means "including but not limited to", "according to … …" means "at least according to … …, but not limited to … … only". In view of the language convention of chinese, the following description, when it does not specifically state the number of a component, means that the component may be one or more, or may be understood as at least one.
Example one
Referring to fig. 1 and 2, the utility model relates to a power detection circuit based on digital isolation, include: the voltage stabilizing module 20, the digital isolation module 30 and the MCU control module 40; the voltage stabilizing module 20 is connected with an input power supply to convert the input power supply into a stable direct current voltage; the power pin and the input pin at the front end of the digital isolation module 30 are respectively connected with the voltage stabilizing module 20; the output pin at the rear end of the digital isolation module 30 is connected with the MCU control module 40, and the MCU control module 40 determines whether the input power is powered according to the high and low levels output by the output pin at the rear end of the digital isolation module 30.
In this embodiment, the input power source comprises an ac input power source; the power detection circuit based on digital isolation further comprises a rectification module 10; the input power is connected to the voltage stabilizing module 20 through the rectifying module 10.
The rectifier module 10 comprises a rectifier diode D1; the anode of the rectifier diode D1 is connected with the input power supply; the cathode of the rectifier diode D1 is connected to the regulator module 20.
The power detection circuit based on digital isolation further comprises: a resistor R1; the input power is connected with the voltage stabilizing module 20 through the rectifying module 10 and the resistor R1 which are connected in series. The resistor R1 needs to select a proper power according to the magnitude of the input power voltage.
The voltage stabilizing module 20 comprises a voltage stabilizing diode D2; the cathode of the zener diode D2 is connected to the power pin VDD1 and the input pin VIN at the front end of the digital isolation module 30, respectively; the anode of the zener diode D2 is connected to the ground pin GND1 at the front end of the digital isolation module 30.
The digital isolation module 30 includes a single channel digital isolation chip U1. In this embodiment, it is preferable that the surge single channel default low level output pi 110xxx series digital isolation chips. Correspondingly, the voltage regulation value of the voltage regulation diode D2 is preferably 5V.
Further, the power detection circuit based on digital isolation further includes: a front-end filtering module for filtering the output of the voltage stabilizing module 20; the front-end filtering module comprises one capacitor or two or more capacitors (C1 and C2) connected in parallel.
The power pin VDD2 at the rear end of the digital isolation module 30 is connected to a dc power VCC; the dc power VCC is also connected to the MCU control module 40 for supplying power.
The power detection circuit based on digital isolation further comprises: the rear-end filtering module is used for filtering the direct-current power supply; the end filtering module comprises a capacitor C3, or two or more capacitors connected in parallel; one end of the rear-end filtering module is connected with the direct-current power supply VCC, and the other end of the rear-end filtering module is connected with a grounding pin GND2 at the rear end of the digital isolation module 30.
In this embodiment, when an ac power is input at the front end, the ac power is first rectified in a single direction by the rectifying diode D1 and divided by the resistor R1 to reach the zener diode D2, and then regulated to +5V by the zener diode D2 and the filter capacitors C1 and C2, and then provided to the power pin VDD1(1, 3) and the input pin VIN (2) at the front end of the digital isolation chip U1, the output pin VOUT (6) at the rear end of the digital isolation chip U1 outputs a high level, and is provided to the I/O input detection of the MCU control module, which detects that the MCU control module is high and represents that the front end is powered; when no direct current power supply is input at the front end, no voltage exists in a power pin VDD1(1, 3) and an input pin VIN (2) at the front end of the digital isolation chip U1, the output pin VOUT (6) at the rear end of the digital isolation chip U1 is output in a low level in a default mode, I/O input detection is provided for the MCU control module, and the MCU control module detects that the output pin is low and represents that the front end does not have power.
Example two
Referring to fig. 3 and 4, the utility model relates to a power detection circuit based on digital isolation, include: the voltage stabilizing module 20, the digital isolation module 30 and the MCU control module 40; the voltage stabilizing module 20 is connected with an input power supply to convert the input power supply into a stable direct current voltage; the power pin and the input pin at the front end of the digital isolation module 30 are respectively connected with the voltage stabilizing module 20; the output pin at the rear end of the digital isolation module 30 is connected with the MCU control module 40, and the MCU control module 40 determines whether the input power is powered according to the high and low levels output by the output pin at the rear end of the digital isolation module 30.
In this embodiment, the input power source includes a dc input power source; the power detection circuit based on digital isolation further comprises: a resistor R1; the input power supply is connected with the voltage stabilizing module through the resistor R1. The resistor R1 needs to select a proper power according to the magnitude of the input power voltage.
The voltage stabilizing module 20 comprises a voltage stabilizing diode D2; the cathode of the zener diode D2 is connected to the power pin VDD1 and the input pin VIN at the front end of the digital isolation module 30, respectively; the anode of the zener diode D2 is connected to the ground pin GND1 at the front end of the digital isolation module 30.
The digital isolation module 30 includes a single channel digital isolation chip U1. In this embodiment, it is preferable that the surge single channel default low level output pi 110xxx series digital isolation chips. Correspondingly, the voltage regulation value of the voltage regulation diode D2 is preferably 5V.
Further, the power detection circuit based on digital isolation further includes: a front-end filtering module for filtering the output of the voltage stabilizing module 20; the front-end filtering module comprises one capacitor or two or more capacitors (C1 and C2) connected in parallel.
The power pin VDD2 at the rear end of the digital isolation module 30 is connected to a dc power VCC; the dc power VCC is also connected to the MCU control module 40 for supplying power.
The power detection circuit based on digital isolation further comprises: the rear-end filtering module is used for filtering the direct-current power supply; the end filtering module comprises a capacitor C3, or two or more capacitors connected in parallel; one end of the rear-end filtering module is connected with the direct-current power supply VCC, and the other end of the rear-end filtering module is connected with a grounding pin GND2 at the rear end of the digital isolation module 30.
In this embodiment, when a direct current power supply is input at the front end, the direct current power supply is divided by a resistor R1 and then reaches a zener diode D2, is stabilized to +5V by the zener diode D2 and filter capacitors C1 and C2, and is provided for a power pin VDD1(1, 3) and an input pin VIN (2) at the front end of a digital isolation chip U1, an output pin VOUT (6) at the rear end of the digital isolation chip U1 outputs a high level, which is provided for I/O input detection of an MCU control module, which detects that the voltage is high and represents that the front end is powered; when no direct current power supply is input at the front end, no voltage exists in a power pin VDD1(1, 3) and an input pin VIN (2) at the front end of the digital isolation chip U1, the output pin VOUT (6) at the rear end of the digital isolation chip U1 is output in a low level in a default mode, I/O input detection is provided for the MCU control module, and the MCU control module detects that the output pin is low and represents that the front end does not have power.
In this embodiment, when the input power is a dc input power, the input power may also include a rectifier module. After the rectifier diode is added, the voltage of the input power supply is reduced to some extent, but the detection result of the MCU control module is not influenced.
The above-mentioned be the utility model discloses a concrete implementation way, nevertheless the utility model discloses a design concept is not limited to this, and the ordinary use of this design is right the utility model discloses carry out immaterial change, all should belong to the act of infringement the protection scope of the utility model.
Claims (8)
1. A digital isolation based power detection circuit, comprising: the device comprises a voltage stabilizing module, a digital isolation module and an MCU control module; the voltage stabilizing module is connected with an input power supply to convert the input power supply into stable direct-current voltage; the power pin and the input pin at the front end of the digital isolation module are respectively connected with the voltage stabilizing module; the output pin at the rear end of the digital isolation module is connected with the MCU control module, and the MCU control module judges whether the input power supply is electrified or not according to the high-low level output by the output pin at the rear end of the digital isolation module; when the input power supply is an alternating-current input power supply, the power supply detection circuit based on digital isolation further comprises a rectification module; the input power supply is connected with the voltage stabilizing module through the rectifying module.
2. The digital isolation based power supply detection circuit of claim 1, further comprising: a resistor; when the input power supply is an alternating current input power supply, the input power supply is connected with the voltage stabilizing module through a rectifying module and a resistor which are connected in series; when the input power supply is a direct-current input power supply, the input power supply is connected with the voltage stabilizing module through the resistor.
3. The digital isolation based power detection circuit of claim 1, wherein the rectification module comprises a rectification diode; the anode of the rectifier diode is connected with the input power supply; and the cathode of the rectifier diode is connected with the voltage stabilizing module.
4. The digital isolation based power detection circuit of claim 1, wherein the voltage regulation module comprises a voltage regulation diode; the cathode of the voltage stabilizing diode is respectively connected with the power pin and the input pin at the front end of the digital isolation module; and the anode of the voltage stabilizing diode is connected with the grounding pin at the front end of the digital isolation module.
5. The digital isolation based power detection circuit of claim 1, wherein the digital isolation module comprises a single channel digital isolation chip.
6. The digital isolation based power supply detection circuit of claim 1, further comprising: the front-end filtering module is used for filtering the output of the voltage stabilizing module; the front-end filtering module comprises a capacitor, or two or more capacitors connected in parallel.
7. The digital isolation based power detection circuit according to claim 1, wherein a power pin at the back end of the digital isolation module is connected to a direct current power supply; the direct current power supply is also connected with the MCU control module to supply power.
8. The digital isolation based power supply detection circuit of claim 7, further comprising: the rear-end filtering module is used for filtering the direct-current power supply; the rear-end filtering module comprises a capacitor, or two or more capacitors connected in parallel; one end of the rear-end filtering module is connected with the direct-current power supply, and the other end of the rear-end filtering module is connected with a grounding pin at the rear end of the digital isolation module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120143800.4U CN214281253U (en) | 2021-01-19 | 2021-01-19 | Power supply detection circuit based on digital isolation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120143800.4U CN214281253U (en) | 2021-01-19 | 2021-01-19 | Power supply detection circuit based on digital isolation |
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| CN214281253U true CN214281253U (en) | 2021-09-24 |
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| CN202120143800.4U Active CN214281253U (en) | 2021-01-19 | 2021-01-19 | Power supply detection circuit based on digital isolation |
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- 2021-01-19 CN CN202120143800.4U patent/CN214281253U/en active Active
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