CN216117771U - AC input voltage detection circuit - Google Patents
AC input voltage detection circuit Download PDFInfo
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- CN216117771U CN216117771U CN202122546564.3U CN202122546564U CN216117771U CN 216117771 U CN216117771 U CN 216117771U CN 202122546564 U CN202122546564 U CN 202122546564U CN 216117771 U CN216117771 U CN 216117771U
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Abstract
The utility model discloses an AC input voltage detection circuit, which comprises a rectifier transformer, a first resistor, a second resistor, a first capacitor, a voltage output end and an MCU (microprogrammed control unit); the rectifier transformer is provided with an input winding connected with an AC input end, a first output winding and a second output winding, wherein the first output winding and the second output winding are connected with the electric component; the second output winding is connected with the first resistor and the second resistor in series in sequence, a connecting point of the first resistor and the second resistor is connected with the voltage output end, and the first capacitor is connected with the second resistor in parallel; the MCU is connected with the voltage output end and used for detecting the voltage of the voltage output end. The utility model does not need to add a voltage transformer, thereby leading the cost to be lower and reducing the volume of the circuit board.
Description
Technical Field
The utility model relates to the technical field of detection circuits, in particular to an AC input voltage detection circuit.
Background
The traditional method for detecting the AC input voltage of the circuit board is to add a voltage transformer for detection, and the input voltage is reduced through the voltage transformer and then output to the MCU for detection.
The detection method needs to add the voltage transformer, and the voltage transformer is high in cost and large in size, so that a large space needs to be occupied on the circuit board, and the size of the circuit board is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing an AC input voltage detection circuit, which does not need to increase a voltage transformer, has lower cost and can reduce the volume of a circuit board.
In order to solve the technical problem, the AC input voltage detection circuit provided by the present invention includes a rectifier transformer, a first resistor, a second resistor, a first capacitor, a voltage output terminal, and an MCU;
the rectifier transformer is provided with an input winding connected with an AC input end, a first output winding and a second output winding, wherein the first output winding and the second output winding are connected with the electric component;
the second output winding is connected with the first resistor and the second resistor in series in sequence, a connecting point of the first resistor and the second resistor is connected with the voltage output end, and the first capacitor is connected with the second resistor in parallel;
the MCU is connected with the voltage output end and used for detecting the voltage of the voltage output end.
Preferably, the AC input voltage detection circuit further includes a diode connected in series between the first resistor and the second output winding, an anode of the diode is connected to the second output winding, and a cathode of the diode is connected to the first resistor.
Preferably, the AC input voltage detection circuit further includes a second capacitor, and the first resistor and the second resistor are connected in series and then connected in parallel with the second capacitor.
Preferably, the AC input voltage detection circuit further includes a third resistor connected in series between a connection point of the first resistor and the second resistor and the voltage output terminal.
After adopting the structure, compared with the prior art, the utility model has the following advantages:
according to the AC input voltage detection circuit, the second output winding is additionally arranged on the original rectifier transformer, the second output winding can output the voltage corresponding to the AC input voltage, and the voltage is subjected to voltage division and reduction and then is output to the MCU through the voltage output end to be detected by the MCU, so that the AC input voltage of the circuit board is detected.
Drawings
Fig. 1 is a circuit schematic of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the AC input voltage detection circuit of the present invention includes a rectifier transformer 10, a first resistor 20, a second resistor 30, a first capacitor 40, a voltage output terminal 50, and an MCU, and the rectifier transformer 10 is inherent to a circuit on a circuit board.
The rectifier transformer 10 has an input winding connected to the AC input terminal, and a first output winding and a second output winding connected to the power consumption components, where the first output winding is used to supply power to the power consumption components on the circuit board, and the second output winding is used to output voltage to detect the AC input voltage.
The second output winding is connected in series with the first resistor 20 and the second resistor 30 in sequence, the connection point of the first resistor 20 and the second resistor 30 is connected with the voltage output end 50, the first capacitor 40 is connected in parallel with the second resistor 30, and the first resistor 20, the second resistor 30 and the first capacitor 40 form a voltage division circuit so as to divide and reduce the voltage of the second output winding.
The MCU is connected to the voltage output terminal 50 and is configured to detect a voltage at the voltage output terminal 50.
The AC input voltage detection circuit further includes a diode 60, the diode 60 is used for voltage stabilization, the diode 60 is connected in series between the first resistor 20 and the second output winding, an anode of the diode 60 is connected to the second output winding, and a cathode of the diode 60 is connected to the first resistor 20.
The AC input voltage detection circuit further includes a second capacitor 70, the second capacitor 70 is used for filtering, and the first resistor 20 and the second resistor 30 are connected in series and then connected in parallel with the second capacitor 70.
The AC input voltage detection circuit further includes a third resistor 80, the third resistor 80 is used for limiting current, and the third resistor 80 is connected in series between a connection point of the first resistor 20 and the second resistor 30 and the voltage output terminal 50.
The above description is only about the preferred embodiment of the present invention, but it should not be understood as limiting the claims, and the present invention may be modified in other structures, not limited to the above structures. In general, all changes which come within the scope of the utility model as defined by the independent claims are intended to be embraced therein.
Claims (4)
1. An AC input voltage detection circuit is characterized by comprising a rectifier transformer (10), a first resistor (20), a second resistor (30), a first capacitor (40), a voltage output end (50) and an MCU;
the rectifier transformer (10) is provided with an input winding connected with an AC input end, a first output winding and a second output winding which are connected with electric components;
the second output winding is sequentially connected with the first resistor (20) and the second resistor (30) in series, the connecting point of the first resistor (20) and the second resistor (30) is connected with the voltage output end (50), and the first capacitor (40) is connected with the second resistor (30) in parallel;
the MCU is connected with the voltage output end (50) and is used for detecting the voltage of the voltage output end (50).
2. The AC input voltage detecting circuit according to claim 1, further comprising a diode (60), wherein the diode (60) is connected in series between the first resistor (20) and the second output winding, an anode of the diode (60) is connected to the second output winding, and a cathode of the diode (60) is connected to the first resistor (20).
3. The AC input voltage detecting circuit according to claim 2, further comprising a second capacitor (70), wherein the first resistor (20) and the second resistor (30) are connected in series and then connected in parallel with the second capacitor (70).
4. The AC input voltage detection circuit according to claim 3, further comprising a third resistor (80), wherein the third resistor (80) is connected in series between a connection point of the first resistor (20) and the second resistor (30) and the voltage output terminal (50).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122546564.3U CN216117771U (en) | 2021-10-21 | 2021-10-21 | AC input voltage detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122546564.3U CN216117771U (en) | 2021-10-21 | 2021-10-21 | AC input voltage detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216117771U true CN216117771U (en) | 2022-03-22 |
Family
ID=80694629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122546564.3U Active CN216117771U (en) | 2021-10-21 | 2021-10-21 | AC input voltage detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216117771U (en) |
-
2021
- 2021-10-21 CN CN202122546564.3U patent/CN216117771U/en active Active
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