AC commercial power monopulse wake-up circuit

Abstract

According to the alternating-current mains supply monopulse wake-up circuit, when the circuit is connected to the mains supply, the circuit only outputs one pulse wake-up signal. The wake-up circuit comprises a rectification energy storage circuit, a pulse width adjusting circuit and an isolation output circuit. The rectification energy storage circuit charges the bus capacitor C21 and supplies power to the pulse width adjusting circuit when the commercial power is in a positive half cycle, and the rectification energy storage circuit discharges power to supply power to the pulse width adjusting circuit through the bus capacitor C21 when the commercial power is in a negative half cycle; a capacitor C20 is arranged in the pulse width adjusting circuit, when the capacitor C20 is not fully charged, current flows through the input end of the isolation output circuit, and the output end of the isolation output circuit outputs a pulse signal; when the capacitor C20 is fully charged, no current flows through the input end of the isolation output circuit, and the output end of the isolation output circuit stops outputting the pulse signal.

Description

Technical Field

[0001] The invention relates to the technical field of power electronics, and in particular to an AC wake-up circuit and an energy storage power supply. Background Art

[0002] With the further breakthrough of lithium battery technology difficulties, energy storage products have been developed rapidly, especially household energy storage products. Since household energy storage products have realized the integration of light, storage and charging, and solved the problem of unstable power system, they have been favored by more and more users. Household energy storage products also involve AC (Alternating Current) charging, PV (Photovoltaic) charging and other working conditions. Among them, there are two main methods of AC charging, one is to manually start charging by pressing the button of the BMS (Battery Management System), and the other is to activate the BMS system charging by AC (Alternating Current). At present, the schemes that can realize AC activation of BMS system charging are relatively limited. The commonly used scheme is to use the design of auxiliary power supply SPS (Switch Power Supply), and after AC makes the auxiliary power supply SPS work normally, MCU (Microcontroller Unit) or other specific circuits are used to generate BMS system activation signals to activate BMS system charging. This commonly used scheme can effectively and reliably activate the BMS system, but the circuit design is complex and the product cost is high.

[0003] The existing AC mains wake-up technology solution is to output a long low or long high level signal through an isolation circuit and a wake-up circuit after the AC mains is connected to wake up the power-consuming device.

[0004] The current AC wake-up circuit technical solution outputs a long low or long high level, which means that the output end of the wake-up circuit is always working, which brings additional energy loss. Summary of the invention

[0005] The main technical problem to be solved by the present invention is to provide an AC mains single-pulse wake-up circuit, which does not need to work continuously after outputting a wake-up signal, thereby reducing energy loss.

[0006] In order to solve the above technical problems, the present invention provides an AC mains single pulse wake-up circuit. When the circuit is connected to the mains, the circuit outputs only one pulse wake-up signal.

[0007] In a preferred embodiment: it includes a rectifier tank circuit, a pulse width adjustment circuit and an isolation output circuit;

[0008] The rectifier energy storage circuit charges the bus capacitor C21 and supplies power to the pulse width adjustment circuit when the mains is in a positive half cycle, and the rectifier energy storage circuit discharges through the bus capacitor C21 to supply power to the pulse width adjustment circuit when the mains is in a negative half cycle;

[0009] The pulse width adjustment circuit is provided with a capacitor C20. When the capacitor C20 is not fully charged, current flows through the input end of the isolated output circuit, and the output end of the isolated output circuit outputs a pulse signal. When the capacitor C20 is fully charged, no current flows through the input end of the isolated output circuit, and the output end of the isolated output circuit stops outputting a pulse signal.

[0010] In a preferred embodiment: the rectifier energy storage circuit includes a diode D1 and a bus capacitor C21, the anode of the diode D1 is connected to the live wire end of the AC mains, and the cathode is connected to one end of the bus capacitor C21 and the pulse width adjustment circuit; the other end of the bus capacitor C21 is connected to the neutral wire end of the AC mains.

[0011] In a preferred embodiment: the capacitor C20 is connected between the cathode of the diode D1 and the isolation output circuit.

[0012] In a preferred embodiment: the isolated output circuit is an optocoupler.

[0013] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0014] The present invention provides an AC mains single pulse wake-up circuit. After connecting to the AC mains, the isolated output circuit starts to output a continuous pulse signal. At the same time, the capacitor C20 in the pulse width adjustment circuit is also in the process of continuous charging. Once the capacitor C20 is fully charged, the isolated output circuit will stop outputting the pulse signal because it cannot get power. The width of the pulse signal is determined by the charging time of the capacitor C20. Therefore, the wake-up circuit outputs a single pulse wake-up signal. Once the pulse signal stops, the entire wake-up circuit will no longer work, unless it is disconnected from the mains and then connected to the mains to output the pulse signal again. Therefore, energy loss can be reduced in this way. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a circuit diagram of the present invention. DETAILED DESCRIPTION

[0016] In order to make the technical solutions and features of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific examples. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0017] The present invention provides an AC mains single pulse wake-up circuit, comprising a rectifier energy storage circuit, a pulse width adjustment circuit and an isolation output circuit;

[0018] The rectifier energy storage circuit includes a diode D1 and a bus capacitor C21, wherein the anode of the diode D1 is connected to the live wire end of the AC mains, and the cathode is connected to one end of the bus capacitor C21 and the pulse width adjustment circuit; the other end of the bus capacitor C21 is connected to the neutral wire end of the AC mains. The bus capacitor C21 is also connected in parallel with a resistor R68.

[0019] The pulse width adjustment circuit includes a capacitor C20 and a resistor R10, which are connected in series between the cathode of the diode D1 and the isolation output circuit. One end of the capacitor C20 connected to the resistor R10 is connected to the neutral line end of the AC mains through a resistor R23.

[0020] The isolated output circuit is an optocoupler.

[0021] The above AC mains single pulse wake-up circuit, when connected to the AC mains, can charge the bus capacitor C21 through the diode D1 and supply power to the pulse width adjustment circuit when the AC mains is in the positive half cycle. At this time, the optocoupler is powered and outputs a pull-down level. When the AC mains is in the negative half cycle, the diode D1 is cut off, the bus capacitor C21 is discharged, and the optocoupler continues to be powered and outputs a pull-down level.

[0022] At the same time, capacitor C20 is also in the charging process. When capacitor C20 is fully charged, current can hardly flow through capacitor C20, no current flows through the optocoupler input, the optocoupler output is turned off, maintaining a high impedance state, and the output pulse ends.

[0023] The above-mentioned AC mains single pulse wake-up circuit, after being connected to the AC mains, the isolated output circuit starts to output a continuous pulse signal. At the same time, the capacitor C20 in the pulse width adjustment circuit is also in the process of continuous charging. Once the capacitor C20 is fully charged, the isolated output circuit will stop outputting the pulse signal because it cannot get power. The width of the pulse signal is determined by the charging time of the capacitor C20. Therefore, the wake-up circuit outputs a single pulse wake-up signal. Once the pulse signal stops, the entire wake-up circuit will no longer work, unless it is disconnected from the mains and then reconnected to the mains to output the pulse signal again. Therefore, energy loss can be reduced in this way.

[0024] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited to this. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. An AC mains single pulse wake-up circuit, characterized in that: When the circuit is connected to the mains, the circuit outputs only one pulse wake-up signal.

2. The AC mains single pulse wake-up circuit according to claim 1, characterized in that: It includes a rectifier energy storage circuit, a pulse width adjustment circuit and an isolation output circuit; The rectifier energy storage circuit charges the bus capacitor C21 and supplies power to the pulse width adjustment circuit when the mains is in a positive half cycle, and the rectifier energy storage circuit discharges through the bus capacitor C21 to supply power to the pulse width adjustment circuit when the mains is in a negative half cycle; The pulse width adjustment circuit is provided with a capacitor C20. When the capacitor C20 is not fully charged, current flows through the input end of the isolation output circuit, and the output end of the isolation output circuit outputs a pulse signal. When the capacitor C20 is fully charged, no current flows through the input end of the isolated output circuit, and the output end of the isolated output circuit stops outputting the pulse signal.

3. The AC mains single pulse wake-up circuit according to claim 2, characterized in that: The rectifier energy storage circuit includes a diode D1 and a bus capacitor C21, wherein the anode of the diode D1 is connected to the live wire end of the AC mains, and the cathode is connected to one end of the bus capacitor C21 and the pulse width adjustment circuit; the other end of the bus capacitor C21 is connected to the neutral wire end of the AC mains.

4. The AC mains single pulse wake-up circuit according to claim 3, characterized in that: The capacitor C20 is connected between the cathode of the diode D1 and the isolation output circuit.

5. The AC mains single pulse wake-up circuit according to claim 4, characterized in that: The isolated output circuit is an optocoupler.

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