Detection circuit of alternating voltage and electronic device

Abstract

The application discloses an alternating voltage detection circuit and electronic equipment. The detection circuit comprises an isolation voltage reduction module, a voltage division module and a pulsating direct current module. The isolation voltage reduction module is connected with the voltage division module, and the voltage division module is connected with the pulsating direct current module. The isolation voltage reduction module is used for receiving an alternating voltage on a high-voltage side and converting the alternating voltage into a low-voltage alternating signal. The voltage division module is used for receiving the low-voltage alternating signal, performing voltage division on the low-voltage alternating signal, and obtaining a target alternating signal. The pulsating direct current module is used for receiving the target alternating signal, generating pulsating direct current according to the target alternating signal and a reference voltage, taking the pulsating direct current as a detection signal of the alternating voltage, and outputting the detection signal. The application can reduce the cost of the alternating voltage detection circuit.

Description

Technical Field

[0001] This application relates to the field of voltage detection technology, specifically to an AC voltage detection circuit and electronic device. Background Technology

[0002] Currently, electronic devices that receive AC voltage as their power supply voltage are generally equipped with a high-voltage side detection circuit for AC voltage, allowing users to obtain AC voltage data to execute logic control.

[0003] However, existing detection circuits typically use isolation amplifiers, which require many external components, resulting in higher costs. Utility Model Content

[0004] In view of this, this application provides an AC voltage detection circuit and electronic device to reduce the cost of AC voltage detection circuits. The technical solution of this application is as follows: This application provides an AC voltage detection circuit, including an isolation step-down module, a voltage divider module, and a pulsating DC module. The isolation step-down module is connected to the voltage divider module, and the voltage divider module is connected to the pulsating DC module. The isolation step-down module receives AC voltage from the high-voltage side and converts the AC voltage into a low-voltage AC signal. The voltage divider module receives the low-voltage AC signal, performs voltage division processing on the low-voltage AC signal to obtain a target AC signal. The pulsating DC module receives the target AC signal, generates pulsating DC current based on the target AC signal and a reference voltage, and outputs the pulsating DC current as the detection signal for the AC voltage.

[0005] In one embodiment of this application, the pulsating DC module includes a pulsating DC unit and a voltage follower unit, wherein the pulsating DC unit is connected to the voltage follower unit; the pulsating DC unit is used to generate the pulsating DC based on the target AC signal and the reference voltage; the voltage follower unit is used to adjust the impedance of the pulsating DC and output the pulsating DC after adjusting the impedance.

[0006] In one embodiment of this application, the pulsating DC unit includes a first resistor and a three-terminal voltage regulator chip; the first end of the first resistor is used to receive the reference voltage, and the second end of the first resistor is connected to the second end of the three-terminal voltage regulator chip and the neutral terminal of the voltage divider module; the first end of the three-terminal voltage regulator chip is connected to the second end, and the third end of the three-terminal voltage regulator chip is connected to the voltage follower unit and grounded.

[0007] In one embodiment of this application, the voltage follower unit includes an operational amplifier; the positive input terminal of the operational amplifier is connected to the live wire terminal of the voltage divider module, the negative input terminal of the operational amplifier is connected to the output terminal, the power supply terminal of the operational amplifier receives the reference voltage, and the ground terminal of the operational amplifier is connected to the pulsating DC unit and grounded.

[0008] In one embodiment of this application, the voltage divider module includes a voltage divider unit and a discharge reset unit, wherein the voltage divider unit is connected to the discharge reset unit; the voltage divider unit is used to perform voltage divider processing on the low-voltage AC signal to obtain a target AC signal; and the discharge reset unit is used to release the charge of the voltage divider unit to reset the voltage divider unit.

[0009] In one embodiment of this application, the voltage divider module includes a first capacitor, a first end of which is connected to the live wire of the isolation step-down module, and a second end of which is connected to the neutral wire of the isolation step-down module.

[0010] In one embodiment of this application, the discharge reset unit includes a second resistor, the first end of which is connected to the live wire of the isolation step-down module, and the second end of which is connected to the neutral wire of the isolation step-down module.

[0011] In one embodiment of this application, the isolation step-down module includes a first Y capacitor and a second Y capacitor; a first end of the first Y capacitor is connected to the live wire of the high-voltage side, and a second end of the first Y capacitor is connected to the live wire of the voltage divider module; a first end of the second Y capacitor is connected to the neutral wire of the high-voltage side, and a second end of the second Y capacitor is connected to the neutral wire of the voltage divider module.

[0012] In one embodiment of this application, the capacitance values ​​of the first Y capacitor and the second Y capacitor are equal.

[0013] A second aspect of this application provides an electronic device, including a controller and the aforementioned detection circuit; the controller is configured to receive the pulsating direct current and obtain voltage data of the alternating current based on the pulsating direct current.

[0014] The detection circuit of this application embodiment converts the AC voltage on the high-voltage side into a low-voltage AC signal by setting an isolation step-down module, then divides the low-voltage AC signal by a voltage divider module to obtain the target AC signal, and finally converts the target AC signal into a pulsating DC output by a pulsating DC module, so as to use the pulsating DC as the AC voltage detection signal, which can reduce the cost of the AC voltage detection circuit. Attached Figure Description

[0015] Figure 1This is a schematic block diagram of an AC voltage detection circuit provided in an embodiment of this application.

[0016] Figure 2 This is a schematic block diagram of a pulsating DC power module provided in an embodiment of this application.

[0017] Figure 3 This is a schematic block diagram of a voltage divider module provided in an embodiment of this application.

[0018] Figure 4 This is a circuit diagram of an AC voltage detection circuit provided in an embodiment of this application.

[0019] Figure 5 This is a schematic block diagram of an electronic device provided in an embodiment of this application. Detailed Implementation

[0020] It should be noted that in the embodiments of this application, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone, where A and B can be singular or plural. The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and drawings of this application are used to distinguish similar objects, not to describe a specific order or sequence.

[0021] It should also be noted that the methods disclosed in the embodiments of this application or the methods shown in the flowcharts include one or more steps for implementing the method. Without departing from the scope of the claims, the execution order of multiple steps can be interchanged, and some steps can also be deleted.

[0022] Currently, electronic devices that receive AC voltage as their power supply voltage are generally equipped with a high-voltage side detection circuit for AC voltage, allowing users to obtain AC voltage data to execute logic control.

[0023] However, existing detection circuits typically use isolation amplifiers, which require many external components, resulting in higher costs.

[0024] This application provides an AC voltage detection circuit and electronic device to reduce the cost of AC voltage detection circuits.

[0025] Please refer to Figure 1 , Figure 1 This is a schematic block diagram of an AC voltage detection circuit provided in an embodiment of this application. The detection circuit 100 includes an isolation step-down module 110, a voltage divider module 120, and a pulsating DC module 130.

[0026] In this embodiment, the isolation step-down module 110 is connected to the voltage divider module 120, and the voltage divider module 120 is connected to the pulsating DC power module 130. The isolation step-down module 110 receives the AC voltage from the high-voltage side and converts it into a low-voltage AC signal.

[0027] Voltage divider module 120 receives low-voltage AC signals, performs voltage divider processing on the low-voltage AC signals to obtain the target AC signal. Pulsating DC module 130 receives the target AC signal, generates pulsating DC based on the target AC signal and reference voltage, and outputs the pulsating DC as a detection signal for AC voltage.

[0028] It is understood that the detection circuit in this application embodiment converts the AC voltage on the high-voltage side into a low-voltage AC signal by setting an isolation step-down module, then performs voltage division processing on the low-voltage AC signal by a voltage divider module to obtain the target AC signal, and finally converts the target AC signal into a pulsating DC output by a pulsating DC module, so as to use the pulsating DC as the AC voltage detection signal, which can reduce the cost of the AC voltage detection circuit.

[0029] In some embodiments, such as Figure 2 As shown, the pulsed DC module 130 includes a pulsed DC unit 131 and a voltage follower unit 132. The pulsed DC unit 131 is connected to the voltage follower unit 132.

[0030] In this embodiment, the pulsating DC unit 131 is used to generate pulsating DC power based on the target AC signal and the reference voltage. The voltage follower unit 132 is used to adjust the impedance of the pulsating DC power and output the pulsating DC power after impedance adjustment.

[0031] It is understood that the pulsed DC module 130 in this embodiment of the application can improve the anti-interference capability and load-carrying capacity of the pulsed DC by setting the voltage follower unit 132 and adjusting the impedance of the pulsed DC, as well as solve the impedance matching problem in the transmission of pulsed DC, and improve the accuracy of the subsequent circuit in detecting AC voltage data after receiving the pulsed DC.

[0032] In some embodiments, such as Figure 3 As shown, the voltage divider module 120 includes a voltage divider unit 121 and a discharge reset unit 122. The voltage divider unit 121 is connected to the discharge reset unit 122.

[0033] In this embodiment, the voltage divider unit 121 is used to perform voltage division processing on the low-voltage AC signal to obtain the target AC signal. The discharge reset unit 122 is used to release the charge of the voltage divider unit 121, thereby resetting the voltage divider unit 121.

[0034] It is understood that the voltage divider module 120 in this embodiment of the application can solve the safety hazards caused by the storage of electrical energy in the voltage divider unit 121 by setting a discharge reset unit 122 to release the charge of the voltage divider unit 121, and can also quickly release the voltage in the voltage divider unit 121 to reset when the direction of the low voltage AC signal changes, so as to ensure that the phase of the target AC signal is synchronized with the phase of the low voltage AC signal, thereby improving the accuracy of AC voltage data detection.

[0035] Please refer to Figure 4 , Figure 4 This is a circuit diagram of an AC voltage detection circuit 100 provided in an embodiment of this application. The detection circuit 100 includes an isolation step-down module 110, a voltage divider module 120, and a pulsating DC module 130. The pulsating DC module 130 includes a pulsating DC unit 131 and a voltage follower unit 132. The voltage divider module 120 includes a voltage divider unit 121 and a discharge reset unit 122, with the voltage divider unit 121 connected to the discharge reset unit 122.

[0036] In this embodiment, the isolation step-down module 110 includes a first Y capacitor CY1 and a second Y capacitor CY2. The first end of the first Y capacitor CY1 is connected to the live wire of the high-voltage side, and the second end of the first Y capacitor CY1 is connected to the live wire of the voltage divider module 120. The first end of the second Y capacitor CY2 is connected to the neutral wire of the high-voltage side, and the second end of the second Y capacitor CY2 is connected to the neutral wire of the voltage divider module 120. The capacitance values ​​of the first Y capacitor CY1 and the second Y capacitor CY2 are equal.

[0037] In some embodiments, the isolation step-down module 110 may also include multiple Y capacitors connected in series to the live wire terminal of the high-voltage side, and multiple Y capacitors connected in series to the neutral wire terminal of the high-voltage side, so as to perform multi-stage step-down of the AC voltage on the high-voltage side to obtain a low-voltage AC signal.

[0038] It is understood that the first Y capacitor CY1 and the second Y capacitor CY2 have the functions of safety isolation and voltage reduction. After isolating and reducing the AC voltage on the high-voltage side, a low-voltage AC signal in phase with the AC voltage can be obtained.

[0039] The voltage divider module 120 includes a first capacitor C1, the first end of which is connected to the live wire of the isolation step-down module 110, and the second end of which is connected to the neutral wire of the isolation step-down module 110.

[0040] The discharge reset unit 122 includes a second resistor R2. The first end of the second resistor R2 is connected to the live wire of the isolation step-down module 110, and the second end of the second resistor R2 is connected to the neutral wire of the isolation step-down module 110.

[0041] The pulsating DC unit 131 includes a first resistor R1 and a three-terminal voltage regulator chip U1. The first terminal of the first resistor R1 is used to receive a reference voltage, and the second terminal of the first resistor R1 is connected to the second terminal of the three-terminal voltage regulator chip U1 and the neutral terminal of the voltage divider module 120. The first terminal and the second terminal of the three-terminal voltage regulator chip U1 are connected, and the third terminal of the three-terminal voltage regulator chip U1 is connected to the voltage follower unit 132 and grounded.

[0042] The voltage follower unit 132 includes an operational amplifier U2. The positive input terminal of the operational amplifier U2 is connected to the live wire terminal of the voltage divider module 120, the negative input terminal of the operational amplifier U2 is connected to the output terminal, the power supply terminal of the operational amplifier U2 receives the reference voltage, and the ground terminal of the operational amplifier U2 is connected to the pulsating DC unit 131 and grounded.

[0043] It can be understood that the pulsating DC unit 131 obtains pulsating DC power by adding the target AC signal and the reference voltage together using the three-terminal voltage regulator chip U1. For example, if the reference voltage is V1 and the AC voltage on the high-voltage side is Vac, then the target AC signal on the first capacitor C1 is Vc1 = Vac. CY1 CY2 2. The pulsating DC output of operational amplifier U2 is Vout = Vc1 + V1.

[0044] Please refer to Figure 5 , Figure 5 This is a schematic block diagram of an electronic device provided in an embodiment of this application. The electronic device 10 includes a controller 101 and a detection circuit 100 from any of the above embodiments.

[0045] In this embodiment, the controller is used to receive pulsating direct current and obtain AC voltage data based on the pulsating direct current. The electronic device 10 includes a smart meter, a communication power supply, a CRPS power supply, etc., which are not limited here.

[0046] It is understood that the beneficial effects of the above-mentioned electronic device 10 can be referred to the beneficial effects of the detection circuit 100 in the foregoing embodiments, and will not be repeated here.

[0047] The embodiments described above are merely preferred embodiments of this application and are not intended to limit the scope of this application. Any modifications and improvements made by those skilled in the art to the technical solutions of this application without departing from the spirit of this application should fall within the protection scope defined by the claims of this application.

Claims

1. An AC voltage detection circuit, characterized in that, It includes an isolation step-down module, a voltage divider module, and a pulsed DC power module, wherein the isolation step-down module is connected to the voltage divider module, and the voltage divider module is connected to the pulsed DC power module; The isolation step-down module is used to receive the AC voltage from the high-voltage side and convert the AC voltage into a low-voltage AC signal; The voltage divider module is used to receive the low-voltage AC signal, perform voltage divider processing on the low-voltage AC signal, and obtain the target AC signal. The pulsating DC module is used to receive the target AC signal, generate pulsating DC based on the target AC signal and the reference voltage, and output the pulsating DC as the detection signal of the AC voltage.

2. The detection circuit as described in claim 1, characterized in that, The pulsed DC module includes a pulsed DC unit and a voltage follower unit, wherein the pulsed DC unit is connected to the voltage follower unit; The pulsating DC unit is used to generate the pulsating DC current based on the target AC signal and the reference voltage; The voltage follower unit is used to adjust the impedance of the pulsating DC power and output the pulsating DC power after the impedance is adjusted.

3. The detection circuit as described in claim 2, characterized in that, The pulsating DC unit includes a first resistor and a three-terminal voltage regulator chip; The first end of the first resistor is used to receive the reference voltage, and the second end of the first resistor is connected to the second end of the three-terminal voltage regulator chip and the neutral terminal of the voltage divider module; the first end of the three-terminal voltage regulator chip is connected to the second end, and the third end of the three-terminal voltage regulator chip is connected to the voltage follower unit and grounded.

4. The detection circuit as described in claim 2, characterized in that, The voltage follower unit includes an operational amplifier; the positive input terminal of the operational amplifier is connected to the live wire terminal of the voltage divider module, the negative input terminal of the operational amplifier is connected to the output terminal, the power supply terminal of the operational amplifier receives the reference voltage, and the ground terminal of the operational amplifier is connected to the pulsating DC unit and grounded.

5. The detection circuit as described in claim 1, characterized in that, The voltage divider module includes a voltage divider unit and a discharge reset unit, wherein the voltage divider unit is connected to the discharge reset unit; The voltage divider unit is used to perform voltage division processing on the low-voltage AC signal to obtain the target AC signal; The discharge and reset unit is used to release the charge of the voltage divider unit and reset the voltage divider unit.

6. The detection circuit as described in claim 5, characterized in that, The voltage divider module includes a first capacitor, the first end of which is connected to the live wire of the isolation step-down module, and the second end of which is connected to the neutral wire of the isolation step-down module.

7. The detection circuit as described in claim 5, characterized in that, The discharge reset unit includes a second resistor, the first end of which is connected to the live wire of the isolation step-down module, and the second end of which is connected to the neutral wire of the isolation step-down module.

8. The detection circuit as described in claim 1, characterized in that, The isolation step-down module includes a first Y capacitor and a second Y capacitor; The first end of the first Y capacitor is connected to the live wire of the high voltage side, and the second end of the first Y capacitor is connected to the live wire of the voltage divider module; the first end of the second Y capacitor is connected to the neutral wire of the high voltage side, and the second end of the second Y capacitor is connected to the neutral wire of the voltage divider module.

9. The detection circuit as described in claim 8, characterized in that, The capacitance values ​​of the first Y capacitor and the second Y capacitor are equal.

10. An electronic device, characterized in that, Includes a controller and a detection circuit as described in any one of claims 1 to 9; The controller is used to receive the pulsating DC power and obtain the voltage data of the AC voltage based on the pulsating DC power.

Images