Plug-in automatic discharge circuit based on alternating voltage detection

Abstract

The utility model discloses an insert piece formula automatic discharge circuit based on alternating voltage detection, including signal module, control module and discharge module, signal module includes MOS pipe Q3, and MOS pipe Q3 is used to maintain the always open state when accessing alternating current AC_L, and turns into the cut -off state when disconnecting alternating current AC_L, control module includes the triode Q6 of being controlled to MOS pipe Q3, photo -coupler U4 and triode Q5, when MOS pipe Q3 turns into the cut -off state, triode Q6 is conducted, and photo -coupler U4 drives triode Q5 to be conducted, discharge module includes the resistance of parallel connection for current drain when triode Q5 is conducted. MOS pipe cuts off when measuring alternating current pulls out, makes photo -coupler U4 run, and the residual operating current is guided into each resistance of parallel connection and carries out discharge consumption, and each resistance cuts off when the sound loudspeaker is inserted and operates, and only turns on after alternating current pulls out, and the sound loudspeaker will not produce additional standby power consumption.

Description

Technical Field

[0001] This utility model relates to the field of circuit design technology, and in particular to a plug-in automatic discharge circuit based on AC voltage detection. Background Technology

[0002] For high-power audio products, the standby power consumption is usually around 200 milliwatts. This means that even after the power is cut off by unplugging the plug or turning off the switch, the indicator light on the audio product will continue to light up for tens of seconds, confusing the user and potentially causing the user to repeatedly turn the audio product on and off.

[0003] To address this, existing solutions involve connecting a high-power resistor in parallel with the load side of the power board for discharge. However, this high-power resistor consumes additional power during standby, significantly increasing standby power consumption. Utility Model Content

[0004] This embodiment discloses a plug-in automatic discharge circuit based on AC voltage detection, specifically including: Signal module, control module, and discharge module; The signal module includes a MOSFET Q3, which is used to maintain a normally open state when AC power AC_L is connected and to switch to a cut-off state when AC power AC_L is disconnected. The control module includes a transistor Q6, an optocoupler U4, and a transistor Q5, all controlled by the MOS transistor Q3. When the MOSFET Q3 is turned off, the transistor Q6 is turned on, and the optocoupler U4 drives the transistor Q5 to turn on. The discharge module includes resistors R59, R60, R67, R61, R62 and R64 connected in parallel, which are used to discharge current when the transistor Q5 is turned on.

[0005] As an optional implementation, a parallel capacitor C13 and capacitor C22, a resistor R50, a resistor R51 and a diode D21 are sequentially connected between the AC power AC_L and the first pin of the MOS transistor Q3 to output a drive signal to the first pin of the MOS transistor Q3 based on the AC power AC_L. The MOSFET Q3 remains in a normally open state based on the drive signal.

[0006] As an optional implementation, pin 2 of the MOSFET Q3 is grounded; A resistor R52, a capacitor C23, a diode ZD1, and a diode D20 are connected in parallel between pins 1 and 2 of the MOSFET Q3.

[0007] As an optional implementation, the third pin of the MOSFET Q3 is connected to the base of the transistor Q6, and the second pin is connected to the emitter of the transistor Q6; The collector of the transistor Q6 is connected to the second pin of the optocoupler U4, and the first pin of the optocoupler U4 is connected to the trigger current VCC. A light-emitting diode is assembled between pins 1 and 2 of the optocoupler U4 to light up when the transistor Q6 is turned on.

[0008] As an optional implementation, the trigger current VCC is connected to the first pin of the optocoupler U4 via resistors R57 and R54, and to the base of the transistor Q6 via resistors R57 and R54.

[0009] As an optional implementation, a photodiode is mounted between the 3rd and 4th pins of the optocoupler U4; The third pin of the optocoupler U4 is connected to the base of the transistor Q5, and the fourth pin is connected to the collector of the transistor Q5 via the discharge module. The photodiode is used to conduct when the light-emitting diode is lit, and to drive the transistor Q5 to conduct.

[0010] As an optional implementation, one end of the discharge module is connected to the operating current V+, and the other end is connected to the grounding current IGND via the transistor Q5.

[0011] As an optional implementation, the discharge module is provided with a connection terminal at one end connected to the operating current V+, for insertion into the circuit board that drives the audio equipment.

[0012] Compared with the prior art, this embodiment has the following beneficial effects: In this embodiment, the MOSFET is turned off when the AC power is detected to be disconnected, causing the optocoupler U4 to operate. The residual operating current is directed to the parallel resistors for discharge and consumption. The resistors are turned off when the speaker is plugged in and only turn on after the AC power is disconnected, so the speaker will not generate additional standby power consumption. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in this embodiment, the accompanying drawings used in the embodiment will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the circuit principle of a plug-in automatic discharge circuit based on AC voltage detection disclosed in this embodiment. Detailed Implementation

[0015] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] Please see Figure 1 This embodiment discloses a plug-in automatic discharge circuit based on AC voltage detection, comprising: Signal module, control module, and discharge module; The signal module includes a MOSFET Q3, which is used to maintain a normally open state when AC power AC_L is connected and to switch to a cut-off state when AC power AC_L is disconnected. The control module includes transistor Q6, which is controlled by MOSFET Q3, optocoupler U4, and transistor Q5; When MOSFET Q3 is turned off, transistor Q6 is turned on, and optocoupler U4 drives transistor Q5 to turn on. The discharge module includes resistors R59, R60, R67, R61, R62 and R64 connected in parallel to discharge current when transistor Q5 is turned on.

[0017] In this embodiment, the MOSFET is turned off when the AC power is detected to be disconnected, causing the optocoupler U4 to operate. The residual operating current is directed to the parallel resistors for discharge and consumption. The resistors are turned off when the speaker is plugged in and only turn on after the AC power is disconnected, so the speaker will not generate additional standby power consumption.

[0018] As an optional implementation, parallel capacitors C13 and C22, resistor R50, resistor R51 and diode D21 are sequentially connected between AC power AC_L and pin 1 of MOSFET Q3 to output a drive signal to pin 1 of MOSFET Q3 based on AC power AC_L. MOSFET Q3 remains normally open based on the drive signal.

[0019] Here, MOSFET Q3 acts as the detection element for AC power AC_L, and plays a role in controlling the opening and closing of the back-end discharge module. Thus, the discharge module only conducts after the AC power is disconnected, and does not consume power during the normal operation of the audio system.

[0020] As an optional implementation, pin 2 of MOSFET Q3 is grounded; A resistor R52, a capacitor C23, a diode ZD1, and a diode D20 are connected in parallel between pins 1 and 2 of MOSFET Q3.

[0021] As an optional implementation, pin 3 of MOSFET Q3 is connected to the base of transistor Q6, and pin 2 is connected to the emitter of transistor Q6; The collector of transistor Q6 is connected to pin 2 of optocoupler U4, and pin 1 of optocoupler U4 is connected to the trigger current VCC. An LED is mounted between pins 1 and 2 of optocoupler U4 to light up when transistor Q6 is turned on.

[0022] As an optional implementation, the trigger current VCC is connected to the first pin of the optocoupler U4 via resistors R57 and R54, and to the base of the transistor Q6 via resistors R57 and R54.

[0023] Here, when MOSFET Q3 is turned off, transistor Q6 is turned on, and the trigger current VCC is grounded through the LED and transistor Q6. As an optional implementation, a photodiode is mounted between pins 3 and 4 of optocoupler U4; Pin 3 of optocoupler U4 is connected to the base of transistor Q5, and pin 4 is connected to the collector of transistor Q5 via a discharge module. The photodiode is used to turn on when the light-emitting diode is lit, and to drive the transistor Q5 to turn on.

[0024] As an optional implementation, one end of the discharge module is connected to the operating current V+, and the other end is connected to the grounding current IGND via transistor Q5.

[0025] Furthermore, the conducting photodiode turns on transistor Q5, allowing the operating current V+ to flow into the discharge module. Several resistors connected in parallel in the discharge module discharge and consume the residual operating current, ensuring that the DC output can be reduced to 0V within 2 seconds. This causes the indicator light on the audio equipment to turn off quickly, without affecting the user's judgment of the audio equipment's working status.

[0026] As an optional implementation, the end of the discharge module connected to the operating current V+ is provided with a connection terminal for insertion into the circuit board mounted on the audio equipment.

[0027] Here, the circuit board is inserted into the audio equipment in a plug-in style, or soldered onto the circuit board, so that existing audio equipment can be modified without redesigning the circuit.

[0028] Compared with the prior art, this embodiment has the following beneficial effects: In this embodiment, the MOSFET is turned off when the AC power is detected to be disconnected, causing the optocoupler U4 to operate. The residual operating current is directed to the parallel resistors for discharge and consumption. The resistors are turned off when the speaker is plugged in and only turn on after the AC power is disconnected, so the speaker will not generate additional standby power consumption.

Claims

1. A plug-in automatic discharge circuit based on AC voltage detection, characterized in that, include: Signal module, control module, and discharge module; The signal module includes a MOSFET Q3, which is used to maintain a normally open state when AC power AC_L is connected and to switch to a cut-off state when AC power AC_L is disconnected. The control module includes a transistor Q6, an optocoupler U4, and a transistor Q5, all controlled by the MOS transistor Q3. When the MOSFET Q3 is turned off, the transistor Q6 is turned on, and the optocoupler U4 drives the transistor Q5 to turn on. The discharge module includes resistors R59, R60, R67, R61, R62 and R64 connected in parallel, which are used to discharge current when the transistor Q5 is turned on.

2. The plug-in automatic discharge circuit based on AC voltage detection according to claim 1, characterized in that, include: A parallel capacitor C13 and capacitor C22, a resistor R50, a resistor R51 and a diode D21 are sequentially connected between the AC power AC_L and the first pin of the MOS transistor Q3 to output a drive signal to the first pin of the MOS transistor Q3 based on the AC power AC_L. The MOSFET Q3 remains in a normally open state based on the drive signal.

3. The plug-in automatic discharge circuit based on AC voltage detection according to claim 2, characterized in that, include: The second pin of the MOSFET Q3 is grounded; A resistor R52, a capacitor C23, a diode ZD1, and a diode D20 are connected in parallel between pins 1 and 2 of the MOSFET Q3.

4. A plug-in automatic discharge circuit based on AC voltage detection according to claim 2, characterized in that, include: The third pin of the MOSFET Q3 is connected to the base of the transistor Q6, and the second pin is connected to the emitter of the transistor Q6. The collector of the transistor Q6 is connected to the second pin of the optocoupler U4, and the first pin of the optocoupler U4 is connected to the trigger current VCC. A light-emitting diode is assembled between pins 1 and 2 of the optocoupler U4 to light up when the transistor Q6 is turned on.

5. A plug-in automatic discharge circuit based on AC voltage detection according to claim 4, characterized in that, include: The trigger current VCC is connected to the first pin of the optocoupler U4 via resistors R57 and R54, and is also connected to the base of the transistor Q6 via resistors R57 and R54.

6. A plug-in automatic discharge circuit based on AC voltage detection according to claim 4, characterized in that, include: A photodiode is assembled between pins 3 and 4 of the optocoupler U4; The third pin of the optocoupler U4 is connected to the base of the transistor Q5, and the fourth pin is connected to the collector of the transistor Q5 via the discharge module. The photodiode is used to conduct when the light-emitting diode is lit, and to drive the transistor Q5 to conduct.

7. A plug-in automatic discharge circuit based on AC voltage detection according to claim 6, characterized in that, include: One end of the discharge module is connected to the operating current V+, and the other end is connected to the grounding current IGND via the transistor Q5.

8. A plug-in automatic discharge circuit based on AC voltage detection according to claim 7, characterized in that, include: The discharge module has a connection terminal at one end connected to the operating current V+, which is used to insert into the circuit board that drives the audio equipment.

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