Subwoofer capable of automatically starting up with signals

Abstract

A subwoofer capable of being automatically started when signals exist comprises a main power source, an MCU and an RCA input circuit, and when the signals exist, RCA signals are amplified through operational amplifiers U1A and U1B and rectified through a diode D1 to form direct-current voltage; when a third pin of the operational amplifier U3A is compared with a first pin of the operational amplifier U3A in reference voltage and the third pin is higher than the first pin, a fourth pin of the operational amplifier U3A outputs a high level; a triode Q3 is conducted through a high-speed switch diode D4, a triode Q4 is cut off and + 36VON is at a high level, and a main power supply + 36V has output; a high-level trigger detection signal Rerigger is sent to the MCU through a high-speed switching diode D6; the Hold on the MCU enables the + 36VON to keep a high level through a high-speed switching diode D5, and the + 36V of the main power supply is always in an output state. And when no signal exists, the MCU does not detect that the high level triggers the Retrigger within a period of time, the Hold high level on the MCU is turned to be low, the + 36VON is turned to be low level, the + 36V of the main power supply has no output, and the whole machine enters a standby state.

Description

TECHNICAL FIELD

[0001] The utility model relates to sound technology field especially, and it is a bass horn that realizes automatic start -up with signal. BACKGROUND

[0002] As an important component of the sound system, the bass horn is used to enhance the low frequency effect and improve the listening experience. However, the existing bass horn products have some common defects in functional design, mainly reflected in the lack of intelligent standby function, which leads to the following problems:

[0003] 1. High energy consumption: the traditional bass horn keeps the core components such as power amplifier circuit and power module in full power working state when there is no audio signal input for a long time, causing unnecessary waste of electric energy, which does not meet the energy-saving and environmental protection trend of modern electronic products;

[0004] 2. Abnormal sound: when the bass horn is in the no-load working state without signal input, its internal circuit is easily affected by external electromagnetic interference or environmental noise, thus producing abnormal sound such as "hum" and "sizzle". This abnormal sound not only affects the user experience, but also may damage the loudspeaker unit in extreme cases;

[0005] 3. Lack of product competitiveness: in today's increasingly competitive market, products lacking intelligent and humanized design are difficult to meet the needs of consumers for convenient, energy-saving and highly reliable products. The lack of automatic standby function makes the product characteristics not outstanding, and it is difficult to form a competitive advantage among similar products.

[0006] Therefore, there is an urgent need for a solution that enables the bass horn to intelligently detect the working state and automatically enter the low-power standby mode when there is no signal, to solve the above problems. CONTENT OF THE UTILITY MODEL

[0007] The technical problem to be solved by the utility model is to provide a bass horn that realizes automatic start-up with signal, which can automatically detect audio signals and enter standby state when there is no valid signal, thus achieving the purposes of energy saving, eliminating abnormal sound and improving product value.

[0008] In order to solve the above technical problems, the technical scheme of the utility model is: a bass speaker realizing automatic starting with signal, comprising main power supply, MCU and RCA input circuit, the RCA input circuit comprises operational amplifier U1A, operational amplifier U1B, operational amplifier U3A, diode D4, diode D5 and diode D6, RCA input signal is connected with the noninverting input terminal of operational amplifier U1A, the inverting input terminal of operational amplifier U1A is connected with its output terminal, the output terminal of operational amplifier U1A is connected with the noninverting input terminal of operational amplifier U3A through Schottky diode, the output terminal of operational amplifier U3A is connected with the anode of high-speed switching diode D4 and D6 respectively, the cathode of high-speed switching diode D4 is connected with the base of triode Q3, the cathode of high-speed switching diode D6 sends a high level trigger detection signal Retrigger to MCU, the cathode of high-speed switching diode D5 is connected with the base of triode Q3, the anode of high-speed switching diode is connected with the pin Hold of MCU, the emitter of triode Q3 is grounded, the collector of triode Q3 is connected with the base of triode Q4, the emitter of triode Q4 is grounded, and the collector of triode Q4 is connected with the first pin + 36V_ON of main power supply;The first pin + 36V_ON of main power supply is controlled by MCU, and the high level opens the main power supply, and the low level closes the main power supply.

[0009] The utility model principle is: when having signal: RCA signal passes through operational amplifier U1A and U1B amplification, diode D1 rectification, forms direct voltage;In operational amplifier U3A the 3rd pin and the 1st pin reference voltage compare, the current design value RCA input is greater than 10mm when the 3rd pin is higher than the 1st pin, and the 4th pin output of operational amplifier U3A is high level;Through high-speed switching diode D4, triode Q3 is turned on, triode Q4 is cut off + 36V_ON is high level, and the main power supply + 36V has output;Through high-speed switching diode D6, MCU is given a high level trigger detection signal Retrigger;Hold on MCU passes through high-speed switching diode D5 and makes + 36V_ON continue high level, and the main power supply + 36V keeps being output state all the time.No signal: a period of time, MCU does not detect high level trigger Retrigger, and the high level of Hold on MCU is converted to low, and + 36V_ON is low, and the main power supply + 36V has no output, and the whole machine enters standby state.

[0010] As an improvement, the model of the operational amplifier U1A and the operational amplifier U1B is TL972, and the model of the operational amplifier U3A is TL331.

[0011] As an improvement, the model of the high-speed switching diode D4, D5 and D6 is BAS21.

[0012] As an improvement, the RCA socket of the RCA input circuit has a detection pin and is connected with the MCU.

[0013] The utility model compared with prior art brings beneficial effect is:

[0014] Through automatic entering standby mode, the bass in idle state's electric energy consumption is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 It is main power output schematic diagram.

[0016] Fig. 2 It is MCU schematic diagram.

[0017] Fig. 3 It is RCA input circuit schematic diagram. DETAILED DESCRIPTION

[0018] The utility model is further explained below with the drawings of specification.

[0019] As Figs. 1 to 3 Shown, a kind of low-frequency speaker of signal automatic start is realized, including main power supply, MCU and RCA input circuit.The main power supply has two groups of power output, main power supply +36V standby no output, +6V standby has output, power supply MCU and operational amplifier.The RCA input circuit includes operational amplifier U1A, operational amplifier U1B, operational amplifier U3A, diode D4, diode D5 and diode D6, RCA input signal is connected with the noninverting input terminal of operational amplifier U1A, the inverting input terminal of operational amplifier U1A is connected with its output, the output of operational amplifier U1A is connected with the noninverting input terminal of operational amplifier U3A by Schottky diode, the output of operational amplifier U3A is respectively connected with the anode of high-speed switching diode D4, D6, the cathode of high-speed switching diode D4 is connected with the base of triode Q3, the cathode of high-speed switching diode D6 sends a high-level trigger detection signal Retrigger to MCU, the cathode of high-speed switching diode D5 is connected with the base of triode Q3, the anode of high-speed switching diode is connected with the pin Hold of MCU, the emitter of triode Q3 is grounded, the collector of triode Q3 is connected with the base of triode Q4, the emitter of triode Q4 is grounded, the collector of triode Q4 is connected with the 1st foot +36V_ON of main power supply.The 1st foot +36V_ON of main power supply is controlled by MCU, high level opens main power supply, low level closes main power supply.The model of operational amplifier U1A and operational amplifier U1B is TL972, the model of operational amplifier U3A is TL331.The model of high-speed switching diode D4, D5, D6 is all BAS21.RCA input circuit's RCA socket is detected foot and is connected with MCU.

[0020] The utility model discloses a principle has signal time: RCA signal passes through operational amplifier U1A and U1B amplification, diode D1 rectification, forms direct voltage, in operational amplifier U3A the 3d foot and the 1st foot reference voltage comparison, the current design value RCA input is greater than 10mm when the 3d foot is higher than the 1st foot, and operational amplifier U3A the 4th foot output high level, through high -speed switch diode D4 makes triode Q3 conduct, and triode Q4 cut -off +36V_ON is high level, and main power supply +36V has output, through high -speed switch diode D6 gives MCU a high level trigger detection signal Retrigger, and the MCU on Hold passes through high -speed switch diode D5 and makes +36V_ON continuous high level, and main power supply +36V keeps being output state all the time. Without signal time: a period of time in MCU does not detect high level trigger Retrigger, and the MCU on Hold high level turns low, and +36V_ON is low, and main power supply +36V has no output, and the whole machine enters standby state.

Claims

1. A subwoofer that automatically powers on upon receiving a signal, comprising a main power supply, an MCU, and an RCA input circuit, characterized in that: The RCA input circuit comprises an operational amplifier U1A, an operational amplifier U1B, an operational amplifier U3A, a diode D4, a diode D5 and a diode D6, the RCA input signal is connected with the non-inverting input terminal of the operational amplifier U1A, the inverting input terminal of the operational amplifier U1A is connected with its output terminal, the output terminal of the operational amplifier U1A is connected with the non-inverting input terminal of the operational amplifier U3A through a Schottky diode, the output terminal of the operational amplifier U3A is connected with the anode of the high-speed switching diode D4 and the high-speed switching diode D6 respectively, the cathode of the high-speed switching diode D4 is connected with the base of the triode Q3, the cathode of the high-speed switching diode D6 sends a high-level trigger detection signal Retrigger to the MCU, the cathode of the high-speed switching diode D5 is connected with the base of the triode Q3, the anode of the high-speed switching diode is connected with the pin Hold of the MCU, the emitter of the triode Q3 is grounded, the collector of the triode Q3 is connected with the base of the triode Q4, the emitter of the triode Q4 is grounded, and the collector of the triode Q4 is connected with the 1st pin +36V_ON of the main power supply; the 1st pin +36V_ON of the main power supply is controlled by the MCU, the high level opens the main power supply, and the low level closes the main power supply.

2. The bass cannon of claim 1, wherein: The model of the operational amplifier U1A and the operational amplifier U1B is TL972, and the model of the operational amplifier U3A is TL331.

3. The bass shaker of claim 1, wherein: The model of the high-speed switching diode D4, D5 and D6 is BAS21.

4. The bass shaker of claim 1, wherein: The RCA socket of the RCA input circuit has a detection pin and is connected with the MCU.

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