Low-power-consumption standby circuit

Abstract

The utility model discloses a low power consumption standby circuit, which comprises a discharge controller U1 and a rectification module, the input end of the rectification module is connected with a live wire L and a null line N of commercial power, a piezoresistor MOV1 is connected between the live wire L and the null line N, and the live wire L is connected with a fuse F1 in series; the input end of the rectification module is connected with a capacitor CX1 in parallel, the discharge pin of the discharge controller U1 is connected with the two ends of the capacitor CX1 in parallel, and when the equipment works and the discharge controller U1 detects that the voltage on the live wire L and the zero wire N is in normal work, the discharge controller U1 automatically keeps a non-working state; and when the voltage of the live wire L and the zero wire N is detected to drop or the system is powered off, the discharge controller U1 is automatically started, a loop is formed through the resistor RX1, the resistor RX3, the resistor RX2 and the resistor RX4 to discharge the capacitor CX1, and the residual charge of the capacitor CX1 is quickly released, so that the charge residue on the live wire terminal and the zero wire terminal is avoided, the electric shock risk is reduced, and the power utilization safety is improved.

Description

Technical Field

[0001] This utility model relates to a device with a standby function, and more particularly to a standby circuit. Background Technology

[0002] Low-power standby mode is widely used in various electronic devices. Its main purpose is to reduce energy consumption when the device is not active, thereby extending battery life or reducing overall energy consumption. The advantage of low-power standby mode is that it can significantly reduce the power consumption of the device, extend battery life, and improve the energy efficiency of the device without affecting the device's function.

[0003] Existing standby power supply circuits use switching power supplies or RC step-down circuits to reduce standby power consumption. However, there is still a small amount of power loss inside the circuit. Especially for devices connected to the mains power, the live wire and neutral wire terminals will still have residual charge in the standby state, which poses a risk of electric shock. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, this utility model provides a low-power standby circuit.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A low-power standby circuit includes a discharge controller U1 and a rectifier module. The input terminal of the rectifier module is connected to the live wire L and the neutral wire N of the mains power supply. A varistor MOV1 is connected between the live wire L and the neutral wire N. A fuse F1 is connected in series with the live wire L. A capacitor CX1 is connected in parallel with the input terminal of the rectifier module. The discharge pin of the discharge controller U1 is connected in parallel across the two ends of the capacitor CX1.

[0007] As a further improvement of this utility model, the rectifier module includes a rectifier bridge BD1, the input terminal of the rectifier bridge BD1 is connected to a common mode inductor LF1, the second pin of the rectifier bridge BD1 is connected to the fourth pin of the common mode inductor LF1, the third pin of the rectifier bridge BD1 is connected to the second pin of the common mode inductor LF1, a capacitor CX1 is connected between the first pin and the third pin of the common mode inductor LF1, and a thermistor RT1 is connected in series with the first pin of the common mode inductor LF1.

[0008] As a further improvement of this utility model, the first to fourth pins of the discharge controller U1 are connected to one side of the capacitor CX1 through parallel resistors RX1 and RX3, and the fifth to eighth pins of the discharge controller U1 are connected to the other side of the capacitor CX1 through parallel resistors RX2 and RX4.

[0009] As a further improvement of this utility model, the output terminal of the rectifier bridge BD1 is connected to the load, the first pin of the rectifier bridge BD1 is grounded, and electrolytic capacitors EC1, EC2, EC3 and C1A are connected in parallel between the first and fourth pins of the rectifier bridge BD1.

[0010] As a further improvement of this utility model, a discharge pin X1 is connected between the first and second pins of the common mode inductor LF1, and a discharge pin X2 is connected between the third and fourth pins of the common mode inductor LF1.

[0011] The beneficial effects of this utility model are as follows: This utility model includes a discharge controller U1 and a rectifier module. The input terminal of the rectifier module is connected to the live wire L and the neutral wire N of the mains power. A varistor MOV1 is connected between the live wire L and the neutral wire N. A fuse F1 is connected in series with the live wire L. A capacitor CX1 is connected in parallel with the input terminal of the rectifier module. The discharge pin of the discharge controller U1 is connected in parallel across the two ends of the capacitor CX1. When the device is working, the discharge controller U1 automatically remains in a non-working state. However, when a voltage drop is detected between the live wire L and the neutral wire N or when the system is powered off, the discharge controller U1 automatically starts and discharges the capacitor CX1 through a circuit formed by resistors RX1, RX3, RX2, and RX4, quickly releasing the residual charge on the capacitor CX1. This avoids residual charge on the live wire and neutral wire terminals, reduces the risk of electric shock, and improves electrical safety. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This is the circuit schematic diagram of this utility model. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0015] It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this invention.

[0016] The following describes some embodiments of the present invention with reference to the accompanying drawings.

[0017] Reference Figure 1A low-power standby circuit includes a discharge controller U1 and a rectifier module. The input terminal of the rectifier module is connected to the live wire L and the neutral wire N of the mains power supply. A varistor MOV1 is connected between the live wire L and the neutral wire N. A fuse F1 is connected in series with the live wire L. A capacitor CX1 is connected in parallel with the input terminal of the rectifier module. The discharge pin of the discharge controller U1 is connected in parallel across the two ends of the capacitor CX1. When the device is in standby mode, the discharge controller U1 discharges the capacitor CX1, quickly releasing the residual charge on the capacitor CX1, thereby avoiding residual charge on the live wire terminal and the neutral wire terminal, reducing the risk of electric shock, and improving electrical safety.

[0018] The rectifier module includes a rectifier bridge BD1, with a common-mode inductor LF1 connected to its input terminal. Pin 2 of rectifier bridge BD1 is connected to pin 4 of common-mode inductor LF1, and pin 3 of rectifier bridge BD1 is connected to pin 2 of common-mode inductor LF1. A capacitor CX1 is connected between pins 1 and 3 of common-mode inductor LF1, and a thermistor RT1 is connected in series with pin 1 of common-mode inductor LF1. In this embodiment, the common-mode inductor LF1 is used to suppress common-mode interference signals; the thermistor RT1 has a high resistance at room temperature, which can limit the inrush current at power-on. As current flows and heat is generated, its resistance gradually decreases, resulting in minimal impact on the circuit during normal operation.

[0019] The capacitor CX1 is a common X capacitor, and the discharge controller U1 is model LN9901. LN9901 is an automatic discharge control chip specifically designed for X capacitor systems. This chip has a highly reliable AC power calibration system, which can automatically discharge the X capacitor after a power outage to bring it to safety requirements, discharging the voltage below the allowable voltage. During normal operation, it automatically remains in a non-operating state, maintaining power consumption at no more than 5mW, thus achieving a zero-power X capacitor system.

[0020] Specifically, pins 1-4 of the discharge controller U1 are connected to one side of capacitor CX1 through parallel resistors RX1 and RX3, and pins 5-8 of the discharge controller U1 are connected to the other side of capacitor CX1 through parallel resistors RX2 and RX4. In this embodiment, when the device is working, if the discharge controller U1 detects that the voltage on the live wire L and the neutral wire N is normal, the discharge controller U1 automatically remains in a non-working state, that is, the discharge pins are in an open circuit state, without affecting the circuit; however, when it detects a drop in the voltage on the live wire L and the neutral wire N or a system power failure, the discharge controller U1 automatically starts, and discharges capacitor CX1 through a circuit formed by resistors RX1, RX3, RX2, and RX4, quickly releasing the residual charge on capacitor CX1, thereby avoiding residual charge on the live wire and neutral wire terminals, reducing the risk of electric shock, and improving electrical safety.

[0021] The output terminal of the rectifier bridge BD1 is connected to the load. The first pin of the rectifier bridge BD1 is grounded. Electrolytic capacitors EC1, EC2, EC3 and C1A are connected in parallel between the first and fourth pins of the rectifier bridge BD1. In this embodiment, the rectifier bridge BD1 converts AC mains power into DC power to provide a power supply voltage for the load. Electrolytic capacitors EC1-EC3 and C1A are used to filter the rectified DC voltage to provide a stable DC voltage.

[0022] A discharge pin X1 is connected between pin 1 and pin 2 of the common-mode inductor LF1, and a discharge pin X2 is connected between pin 3 and pin 4 of the common-mode inductor LF1. In this embodiment, during circuit maintenance or repair, the discharge pin X1 or discharge pin X2 can be touched with a screwdriver or a discharge device to release any residual charge in the common-mode inductor LF1, ensuring the safety of the operator.

[0023] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A low-power standby circuit, characterized in that... The system includes a discharge controller U1 and a rectifier module. The input terminal of the rectifier module is connected to the live wire L and the neutral wire N of the mains power supply. A varistor MOV1 is connected between the live wire L and the neutral wire N. A fuse F1 is connected in series with the live wire L. A capacitor CX1 is connected in parallel with the input terminal of the rectifier module. The discharge pin of the discharge controller U1 is connected in parallel across the two ends of the capacitor CX1.

2. The low-power standby circuit according to claim 1, characterized in that... The rectifier module includes a rectifier bridge BD1, with a common-mode inductor LF1 connected to its input terminal. The second pin of the rectifier bridge BD1 is connected to the fourth pin of the common-mode inductor LF1, and the third pin of the rectifier bridge BD1 is connected to the second pin of the common-mode inductor LF1. A capacitor CX1 is connected between the first and third pins of the common-mode inductor LF1, and a thermistor RT1 is connected in series with the first pin of the common-mode inductor LF1.

3. The low-power standby circuit according to claim 2, characterized in that... Pins 1-4 of the discharge controller U1 are connected to one side of capacitor CX1 through resistors RX1 and RX3 in parallel, and pins 5-8 of the discharge controller U1 are connected to the other side of capacitor CX1 through resistors RX2 and RX4 in parallel.

4. The low-power standby circuit according to claim 2, characterized in that... The output terminal of the rectifier bridge BD1 is connected to the load. The first pin of the rectifier bridge BD1 is grounded. Electrolytic capacitors EC1, EC2, EC3 and C1A are connected in parallel between the first and fourth pins of the rectifier bridge BD1.

5. The low-power standby circuit according to claim 2, characterized in that... A discharge pin X1 is connected between pin 1 and pin 2 of the common mode inductor LF1, and a discharge pin X2 is connected between pin 3 and pin 4 of the common mode inductor LF1.

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