High-penetrating-power audio amplifying circuit

Abstract

A high-penetrating-power audio amplifying circuit is provided with a first amplifying module, a second amplifying module and a third amplifying module, and the second amplifying module is connected with the first amplifying module and the third amplifying module. The high-penetrating-power audio amplifying circuit is provided with the amplifying modules, each amplifying module is a channel, that is, the high-penetrating-power audio amplifying circuit is provided with three-channel output, and the three-channel output can effectively control the gain of each channel, so that the output is more balanced, and as many as three loudspeakers can be driven; a better stereophonic effect, stronger low-frequency response and higher-quality music experience are achieved, the penetrating power of audio output can be effectively improved, and the stability and reliability of output power are greatly improved. Compared with a dual-channel output audio power amplification circuit in the prior art, the audio power amplification circuit provided by the utility model has higher penetrating power and is suitable for being used in an open outdoor environment.

Description

Technical Field

[0001] The utility model relates to the technical field of audio power amplifier circuits, in particular to a high-penetration audio amplifier circuit. Background Art

[0002] At present, the audio power amplifier circuit is mainly based on dual-channel output. The dual-channel output working mode has two independent channels and can output two signals at the same time. The dual channel can improve the volume and quality of the audio output. At the same time, the dual-channel design also makes the mixture of music and sound clearer and more natural, so that the audience can get a better auditory experience. For example, the Chinese patent announcement number is CN203896315U, a dual-channel high-power audio amplifier circuit. However, this dual-channel audio amplifier circuit is limited to small indoor or outdoor spaces. For an open outdoor environment, the sound generated by this dual-channel audio amplifier circuit is difficult to diffuse, resulting in weak audio penetration.

[0003] Therefore, in view of the shortcomings of the prior art, it is necessary to provide a high-penetration audio amplifier circuit to solve the shortcomings of the prior art. Utility Model Content

[0004] The purpose of the utility model is to avoid the shortcomings of the prior art and provide a high-penetration audio amplifier circuit. Compared with the dual-channel audio power amplifier circuit in the prior art, the high-penetration audio amplifier circuit has better stereo effect, low-frequency response and higher-quality music experience, can effectively improve the penetration of audio output, and greatly improve the stability and reliability of output power.

[0005] The above-mentioned purpose of the utility model is achieved through the following technical measures:

[0006] Provided is a high-penetration audio amplifier circuit, which is provided with a first amplifier module, a second amplifier module and a third amplifier module, wherein the second amplifier module is connected to the first amplifier module and the third amplifier module respectively.

[0007] The first amplification module is provided with a first signal differential input unit, a first constant current load bias unit, a first signal voltage amplification unit, a first thermal coupling bias unit, a first lead compensation unit and a first current amplification unit. The first signal differential input unit is respectively connected to the first constant current load bias unit and the first signal voltage amplification unit, the first signal voltage amplification unit is connected to the first thermal coupling bias unit and the first current amplification unit, and the first thermal coupling bias unit is connected to the first current amplification unit and the first lead compensation unit.

[0008] The second amplification module is provided with a second signal differential input unit, a second constant current load bias unit, a second signal voltage amplification unit, a second thermal coupling bias unit, a second lead compensation unit and a second current amplification unit. The second signal differential input unit is respectively connected to the second constant current load bias unit and the second signal voltage amplification unit, the second signal voltage amplification unit is connected to the second thermal coupling bias unit and the second current amplification unit, and the second thermal coupling bias unit is connected to the second current amplification unit and the second lead compensation unit.

[0009] The third amplification module is provided with a third signal differential input unit, a third constant current load bias unit, a third signal voltage amplification unit, a third thermal coupling bias unit, a third lead compensation unit and a third current amplification unit. The third signal differential input unit is respectively connected to the third constant current load bias unit and the third signal voltage amplification unit, the third signal voltage amplification unit is connected to the third thermal coupling bias unit and the third current amplification unit, and the third thermal coupling bias unit is connected to the third current amplification unit and the third lead compensation unit.

[0010] The first signal differential input unit, the second signal differential input unit and the third signal differential input unit are connected, the first signal voltage amplification unit, the second signal voltage amplification unit and the third signal voltage amplification unit are connected, the first constant current load bias unit, the second constant current load bias unit and the third constant current load bias unit are connected, the first thermal coupling bias unit, the second thermal coupling bias unit and the third thermal coupling bias unit are connected, the first lead compensation unit, the second lead compensation unit and the third lead compensation unit are connected; the first current amplification unit, the second current amplification unit and the third current amplification unit are connected.

[0011] Preferably, the above-mentioned first signal differential mode input unit is provided with a resistor R1, a transistor TR1 and a transistor TR2, one end of the resistor R1 is connected to the peripheral circuit as a pin 4, the other end of the resistor R1 is connected to the collector of the transistor TR1, the collector of the transistor TR1 is also connected to the first signal voltage amplification unit, the emitter of the transistor TR1 is connected to the emitter of the transistor TR2, the emitter of the transistor TR1 is connected to the first constant current load bias unit, the collector of the transistor TR2 is connected to the pin 4, the base of the transistor TR1 is connected to the peripheral circuit as a pin 1, and the base of the transistor TR2 is connected to the peripheral circuit as a pin 2.

[0012] Preferably, the above-mentioned second signal differential input unit is provided with a resistor R13, a transistor TR14 and a transistor TR15, one end of the resistor R13 is connected to pin 4, the other end of the resistor R13 is connected to the collector of the transistor TR15, the collector of the transistor TR15 is also connected to the second signal voltage amplification unit, the emitter of the transistor TR15 is connected to the emitter of the transistor TR14, the emitter of the transistor TR15 is connected to the second constant current load bias unit, the collector of the transistor TR14 is connected to pin 4, the base of the transistor TR15 is connected to the peripheral circuit as pin 15, and the base of the transistor TR14 is connected to the peripheral circuit as pin 14.

[0013] Preferably, the above-mentioned third signal differential mode input unit is provided with a resistor R20, a transistor TR22 and a transistor TR23, one end of the resistor R20 is connected to pin 4, the other end of the resistor R20 is connected to the collector of the transistor TR23, the collector of the transistor TR23 is also connected to the third signal voltage amplification unit, the emitter of the transistor TR23 is connected to the emitter of the transistor TR22, the emitter of the transistor TR23 is connected to the third constant current load bias unit, the collector of the transistor TR22 is connected to pin 4, the base of the transistor TR22 is connected to the peripheral circuit as pin 17, and the base of the transistor TR23 is connected to the peripheral circuit as pin 10.

[0014] Preferably, the above-mentioned first constant current load bias unit is provided with a transistor TR3, a resistor R2, a diode D1-1 and a diode D1-2, the collector of the transistor TR3 is connected to the emitter of the transistor TR1, the emitter of the transistor TR3 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to the peripheral circuit as a pin 12, the base of the transistor TR3 is connected to the peripheral circuit as a pin 5, the base of the transistor TR3 is also connected to the positive electrode of the diode D1-1, the negative electrode of the diode D1-1 is connected to the positive electrode of the diode D1-2, and the negative electrode of the diode D1-2 is connected to the pin 12.

[0015] Preferably, the above-mentioned second constant current load bias unit is provided with a transistor TR16 and a resistor R14, the collector of the transistor TR16 is connected to the emitter of the transistor TR14, the emitter of the transistor TR16 is connected to one end of the resistor R14, the other end of the resistor R14 is connected to pin 12, and the base of the transistor TR16 is connected to pin 5.

[0016] Preferably, the above-mentioned third constant current load bias unit is provided with a transistor TR24 and a resistor R21, the collector of the transistor TR24 is connected to the emitter of the transistor TR23, the emitter of the transistor TR24 is connected to one end of the resistor R21, the other end of the resistor R21 is connected to pin 12, and the base of the transistor TR23 is connected to pin 5.

[0017] Preferably, the above-mentioned first lead compensation unit is provided with a transistor TR5, a resistor R5 and a resistor R7, the collector of the transistor TR5 is connected to the first thermal coupling bias unit and the first current amplification unit, the base series resistor R5 of the transistor TR5 is connected to pin 5, and the emitter series resistor R7 of the transistor TR5 is connected to pin 12.

[0018] Preferably, the above-mentioned second lead compensation unit is provided with a transistor TR13, a resistor R9 and a resistor R10, the collector of the transistor TR13 is connected to the second thermal coupling bias unit and the second current amplification unit, the base series resistor R10 of the transistor TR13 is connected to pin 5, and the emitter series resistor R9 of the transistor TR13 is connected to pin 12.

[0019] Preferably, the above-mentioned third lead compensation unit is provided with a transistor TR20, a resistor R16 and a resistor R17, the collector of the transistor TR20 is connected to the third thermal coupling bias unit and the third current amplification unit, the base series resistor R17 of the transistor TR20 is connected to pin 5, and the emitter series resistor R16 of the transistor TR20 is connected to pin 12.

[0020] Preferably, the above-mentioned first signal voltage amplifying unit is provided with a transistor TR4 and a capacitor C1, the base of the transistor TR4 is connected in series with the capacitor C1 and the collector, the base of the transistor TR4 is connected to the collector of the transistor TR1, the collector of the transistor TR4 is connected to the first thermal coupling bias unit and the first current amplifying unit, and the emitter of the transistor TR4 is connected to pin 4.

[0021] Preferably, the above-mentioned second signal voltage amplifying unit is provided with a transistor TR11 and a capacitor C2, the base of the transistor TR11 is connected in series with the capacitor C2 and the collector, the base of the transistor TR11 is connected to the collector of the transistor TR15, the collector of the transistor TR11 is connected to the second thermal coupling bias unit and the second current amplifying unit, and the emitter of the transistor TR11 is connected to pin 4.

[0022] Preferably, the above-mentioned third signal voltage amplifying unit is provided with a transistor TR21 and a capacitor C3, the base of the transistor TR21 is connected in series with the capacitor C3 and the collector, the base of the transistor TR21 is connected to the collector of the transistor TR23, the collector of the transistor TR21 is connected to the third thermal coupling bias unit and the third current amplifying unit, and the emitter of the transistor TR21 is connected to pin 4.

[0023] Preferably, the above-mentioned first thermal coupling bias unit is provided with a transistor TR5-1, a transistor TR5-2, a resistor R3 and a resistor R5. The base of the transistor TR5-1 is connected in series with the resistor R3 and connected to the collector of the transistor TR4. The base of the transistor TR5-1 is also connected in series with the resistor R4 and connected to the collector of the transistor TR6. The collector of the transistor TR5-1 is connected to the collector of the transistor TR4. The collector of the transistor TR5-1 is also connected to the collector of the transistor TR5-2. The emitter of the transistor TR5-1 is connected to the base of the transistor TR5-2. The emitter of the transistor TR5-2 is connected to the collector of the transistor TR6.

[0024] Preferably, the second thermally coupled bias unit is provided with a transistor TR12-1, a transistor TR12-2, a resistor R11 and a resistor R12. The base of the transistor TR12-1 is connected in series with the resistor R11 and connected to the collector of the transistor TR11. The base of the transistor TR12-1 is also connected in series with the resistor R12 and connected to the collector of the transistor TR13. The collector of the transistor TR12-1 is connected to the collector of the transistor TR11. The collector of the transistor TR12-1 is also connected to the collector of the transistor TR12-2. The emitter of the transistor TR12-1 is connected to the base of the transistor TR12-2. The emitter of the transistor TR12-2 is connected to the collector of the transistor TR13.

[0025] Preferably, the third thermal coupling bias unit is provided with a transistor TR19-1, a transistor TR19-2, a resistor R18 and a resistor R19. The base of the transistor TR19-1 is connected in series with the resistor R18 and connected to the collector of the transistor TR21. The base of the transistor TR19-1 is also connected in series with the resistor R19 and connected to the collector of the transistor TR20. The collector of the transistor TR19-1 is connected to the collector of the transistor TR21. The collector of the transistor TR19-1 is also connected to the collector of the transistor TR19-2. The emitter of the transistor TR19-1 is connected to the base of the transistor TR19-2. The emitter of the transistor TR19-2 is connected to the collector of the transistor TR20.

[0026] Preferably, the above-mentioned first current amplification unit is provided with chip TR7, chip TR8 and resistor R6, the base series resistor R6 of chip TR7 is connected to the collector of transistor TR5-2, the collector of chip TR7 is connected to the peripheral circuit as pin 8, the emitter of chip TR7 is connected to the peripheral circuit as pin 6, the base of chip TR8 is connected to the emitter of transistor TR5-2, the collector of chip TR8 is connected to the peripheral circuit as pin 9, and the emitter of chip TR8 is connected to the peripheral circuit as pin 7.

[0027] Preferably, the above-mentioned two current amplification units are provided with chip TR9, chip TR10 and resistor R8, the base series resistor R8 of chip TR9 is connected to the collector of transistor TR12-2, the collector of chip TR9 is connected to pin 8, the emitter of chip TR9 is connected to the peripheral circuit as pin 10, the base of chip TR10 is connected to the emitter of transistor TR12-2, the collector of chip TR10 is connected to pin 9, and the emitter of chip TR10 is connected to the peripheral circuit as pin 11.

[0028] Preferably, the above-mentioned third current amplification unit is provided with chip TR17, chip TR18 and resistor R15, the base series resistor R15 of chip TR17 is connected to the collector of transistor TR19-2, the collector of chip TR17 is connected to pin 8, the emitter of chip TR17 is connected to the peripheral circuit as pin 18, the collector of chip TR18 is connected to pin 9, the collector of chip TR18 is connected to pin 9, and the emitter of chip TR18 is connected to the peripheral circuit as pin 18.

[0029] The high-penetration audio amplifier circuit of the utility model is further provided with a heat dissipation copper block, and the chip TR7, the chip TR8, the chip TR9, the chip TR10, the chip TR17 and the chip TR18 are all sintered with the heat dissipation copper block.

[0030] The model of chip TR8, chip TR10, chip TR18 is 2113P; the model of chip TR7, chip TR9, chip TR17 is 2113N; the model of transistor TR4, transistor TR11 and transistor TR21 is ST5401; the model of transistor TR1, transistor TR2, transistor TR14, transistor TR15, transistor TR22 and transistor TR23 is FMW3; the model of transistor TR3, transistor TR5-1, transistor TR5-2, transistor TR6, transistor TR12-1, transistor TR12-2, transistor TR13, transistor TR16, transistor TR19-1, transistor TR19-2, transistor TR19-3, transistor TR20-4, transistor TR21-5, transistor TR22-6, transistor TR23-7, transistor TR24-8, transistor TR25-9, transistor TR26-10, transistor TR26-21, transistor TR27-3, transistor TR28-4, transistor TR29-11, transistor TR29-22, transistor TR29-33, transistor TR29-12, transistor TR29-23, transistor TR29-24, transistor TR29-35 The model of tube TR20 and transistor TR24 is LBC846BWT1G; the model of resistor R5, resistor R10 and resistor R17 is 0603 / 10K / J; the model of resistor R1, resistor R13 and resistor R20 is 0603 / 1K / J; the model of resistor R4, resistor R12 and resistor R19 is 0603 / 2.4K / J; the model of resistor R3, resistor R11 and resistor R18 is 0603 / 4.7K / J; the model of resistor R2, resistor R7, resistor R9, resistor R14, resistor R16 and resistor R21 is 0603 / 470 / J; the model of capacitor C1, capacitor C2 and capacitor C3 is 0805 / 39PF / K / 50V.

[0031] The utility model discloses a high-penetration audio amplifier circuit, which is provided with a first amplifier module, a second amplifier module and a third amplifier module, wherein the second amplifier module is respectively connected to the first amplifier module and the third amplifier module; the first amplifier module is provided with a first signal differential mode input unit, a first constant current load bias unit, a first signal voltage amplifier unit, a first thermal coupling bias unit, a first lead compensation unit and a first current amplifier unit, wherein the first signal differential mode input unit is respectively connected to the first constant current load bias unit and the first signal voltage amplifier unit, the first signal voltage amplifier unit is respectively connected to the first thermal coupling bias unit and the first current amplifier unit, the first thermal coupling bias unit is respectively connected to the first current amplifier unit and the first lead compensation unit; the second amplifier module is provided with a second signal differential mode input unit, a second constant current load bias unit, a second signal voltage amplifier unit, a second thermal coupling bias unit, a second lead compensation unit and a second current amplifier unit, wherein the second signal differential mode input unit is respectively connected to the second constant current load bias unit and the second signal voltage amplifier unit, the second signal voltage amplifier unit is respectively connected to the second thermal coupling bias unit and the second current amplifier unit, the second thermal coupling bias unit is respectively connected to the second current amplifier unit Unit and the second lead compensation unit; the third amplification module is provided with a third signal differential input unit, a third constant current load bias unit, a third signal voltage amplification unit, a third thermal coupling bias unit, a third lead compensation unit and a third current amplification unit, the third signal differential input unit is respectively the third constant current load bias unit and the third signal voltage amplification unit, the third signal voltage amplification unit and the third thermal coupling bias unit, the third current amplification unit, the third thermal coupling bias unit and the third current amplification unit and the third lead compensation unit; the first signal differential input unit, the second The signal differential input unit is connected to the third signal differential input unit, the first signal voltage amplification unit, the second signal voltage amplification unit and the third signal voltage amplification unit are connected, the first constant current load bias unit, the second constant current load bias unit and the third constant current load bias unit are connected, the first thermal coupling bias unit, the second thermal coupling bias unit and the third thermal coupling bias unit are connected, the first lead compensation unit, the second lead compensation unit and the third lead compensation unit are connected; the first current amplification unit, the second current amplification unit and the third current amplification unit are connected.The high-penetration audio amplifier circuit is provided with an amplifier module, each of which is a channel, that is, the utility model is provided with a three-channel output, which can effectively control the gain of each channel, making the output more balanced, so as to drive up to 3 speakers, achieve better stereo effects, stronger low-frequency response and higher-quality music experience, and can effectively improve the penetration of audio output, and greatly improve the stability and reliability of output power. Compared with the audio power amplifier circuit with dual-channel output in the prior art, the audio amplifier circuit of the utility model has higher penetration and is suitable for use in open outdoor environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention is further described with reference to the accompanying drawings, but the contents in the accompanying drawings do not constitute any limitation to the present invention.

[0033] Figure 1 This is a circuit diagram of the high-penetration audio amplifier circuit of Example 1.

[0034] Figure 2 This is the circuit diagram of the peripheral circuit.

[0035] exist Figures 1 to 2 Including:

[0036] A first signal differential mode input unit 11, a first constant current load bias unit 21, a first signal voltage amplification unit 31, a first thermal coupling bias unit 41, a first lead compensation unit 51, a first current amplification unit 61,

[0037] The second signal differential mode input unit 12, the second constant current load bias unit 22, the second signal voltage amplification unit 32, the second thermal coupling bias unit 42, the second lead compensation unit 52, the second current amplification unit 62,

[0038] The third signal differential mode input unit 13 , the third constant current load bias unit 23 , the third signal voltage amplification unit 33 , the third thermal coupling bias unit 43 , the third lead compensation unit 53 , and the third current amplification unit 63 . DETAILED DESCRIPTION

[0039] The technical solution of the utility model is further described in conjunction with the following embodiments.

[0040] Example 1

[0041] A high-penetration audio amplifier circuit, such as Figure 1 As shown, a first amplifying module, a second amplifying module and a third amplifying module are provided, and the second amplifying module is connected to the first amplifying module and the third amplifying module respectively.

[0042] The first amplification module is provided with a first signal differential input unit 11, a first constant current load bias unit 21, a first signal voltage amplification unit 31, a first thermal coupling bias unit 41, a first lead compensation unit 51 and a first current amplification unit 61. The first signal differential input unit 11 is respectively connected to the first constant current load bias unit 21 and the first signal voltage amplification unit 31, the first signal voltage amplification unit 31 is connected to the first thermal coupling bias unit 41 and the first current amplification unit 61, and the first thermal coupling bias unit 41 is connected to the first current amplification unit 61 and the first lead compensation unit 51.

[0043] The second amplification module is provided with a second signal differential input unit 12, a second constant current load bias unit 22, a second signal voltage amplification unit 32, a second thermal coupling bias unit 42, a second lead compensation unit 52 and a second current amplification unit 62. The second signal differential input unit 12 is respectively connected to the second constant current load bias unit 22 and the second signal voltage amplification unit 32, the second signal voltage amplification unit 32 and the second thermal coupling bias unit 42, the second current amplification unit 62, the second thermal coupling bias unit 42 and the second current amplification unit 62 and the second lead compensation unit 52.

[0044] The third amplification module is provided with a third signal differential input unit 13, a third constant current load bias unit 23, a third signal voltage amplification unit 33, a third thermal coupling bias unit 43, a third lead compensation unit 53 and a third current amplification unit 63. The third signal differential input unit 13 is respectively connected to the third constant current load bias unit 23 and the third signal voltage amplification unit 33, the third signal voltage amplification unit 33 is connected to the third thermal coupling bias unit 43 and the third current amplification unit 63, and the third thermal coupling bias unit 43 is connected to the third current amplification unit 63 and the third lead compensation unit 53.

[0045] The first signal differential input unit 11, the second signal differential input unit 12 and the third signal differential input unit 13 are connected, the first signal voltage amplification unit 31, the second signal voltage amplification unit 32 and the third signal voltage amplification unit 33 are connected, the first constant current load bias unit 21, the second constant current load bias unit 22 and the third constant current load bias unit 23 are connected, the first thermal coupling bias unit 41, the second thermal coupling bias unit 42 and the third thermal coupling bias unit 43 are connected, the first lead compensation unit 51, the second lead compensation unit 52 and the third lead compensation unit 53 are connected; the first current amplification unit 61, the second current amplification unit 61 and the third current amplification unit 63 are connected.

[0046] The first signal differential input unit 11 is provided with a resistor R1, a transistor TR1 and a transistor TR2, one end of the resistor R1 is connected to the peripheral circuit as a pin 4, the other end of the resistor R1 is connected to the collector of the transistor TR1, the collector of the transistor TR1 is also connected to the first signal voltage amplification unit 31, the emitter of the transistor TR1 is connected to the emitter of the transistor TR2, the emitter of the transistor TR1 is connected to the first constant current load bias unit 21, the collector of the transistor TR2 is connected to the pin 4, the base of the transistor TR1 is connected to the peripheral circuit as a pin 1, and the base of the transistor TR2 is connected to the peripheral circuit as a pin 2.

[0047] The second signal differential input unit 12 is provided with a resistor R13, a transistor TR14 and a transistor TR15, one end of the resistor R13 is connected to pin 4, the other end of the resistor R13 is connected to the collector of the transistor TR15, the collector of the transistor TR15 is also connected to the second signal voltage amplification unit 32, the emitter of the transistor TR15 is connected to the emitter of the transistor TR14, the emitter of the transistor TR15 is connected to the second constant current load bias unit 22, the collector of the transistor TR14 is connected to pin 4, the base of the transistor TR15 is connected to the peripheral circuit as pin 15, and the base of the transistor TR14 is connected to the peripheral circuit as pin 14.

[0048] The third signal differential input unit 13 is provided with a resistor R20, a transistor TR22 and a transistor TR23, one end of the resistor R20 is connected to pin 4, the other end of the resistor R20 is connected to the collector of the transistor TR23, the collector of the transistor TR23 is also connected to the third signal voltage amplification unit 33, the emitter of the transistor TR23 is connected to the emitter of the transistor TR22, the emitter of the transistor TR23 is connected to the third constant current load bias unit 23, the collector of the transistor TR22 is connected to pin 4, the base of the transistor TR22 is connected to the peripheral circuit as pin 17, and the base of the transistor TR23 is connected to the peripheral circuit as pin 10.

[0049] The first constant current load bias unit 21 is provided with a transistor TR3, a resistor R2, a diode D1-1 and a diode D1-2. The collector of the transistor TR3 is connected to the emitter of the transistor TR1, the emitter of the transistor TR3 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to the peripheral circuit as a pin 12, the base of the transistor TR3 is connected to the peripheral circuit as a pin 5, the base of the transistor TR3 is also connected to the anode of the diode D1-1, the cathode of the diode D1-1 is connected to the anode of the diode D1-2, and the cathode of the diode D1-2 is connected to the pin 12.

[0050] The second constant current load bias unit 22 is provided with a transistor TR16 and a resistor R14, the collector of the transistor TR16 is connected to the emitter of the transistor TR14, the emitter of the transistor TR16 is connected to one end of the resistor R14, the other end of the resistor R14 is connected to the pin 12, and the base of the transistor TR16 is connected to the pin 5.

[0051] The third constant current load bias unit 23 is provided with a transistor TR24 and a resistor R21, the collector of the transistor TR24 is connected to the emitter of the transistor TR23, the emitter of the transistor TR24 is connected to one end of the resistor R21, the other end of the resistor R21 is connected to the pin 12, and the base of the transistor TR23 is connected to the pin 5.

[0052] The first leading compensation unit 51 is provided with a transistor TR5, a resistor R5 and a resistor R7. The collector of the transistor TR5 is connected to the first thermal coupling bias unit 41 and the first current amplification unit 61. The base series resistor R5 of the transistor TR5 is connected to the pin 5. The emitter series resistor R7 of the transistor TR5 is connected to the pin 12.

[0053] The second lead compensation unit 52 is provided with a transistor TR13, a resistor R9 and a resistor R10. The collector of the transistor TR13 is connected to the second thermal coupling bias unit 42 and the second current amplification unit 62. The base series resistor R10 of the transistor TR13 is connected to the pin 5. The emitter series resistor R9 of the transistor TR13 is connected to the pin 12.

[0054] The third leading compensation unit 53 is provided with a transistor TR20, a resistor R16 and a resistor R17. The collector of the transistor TR20 is connected to the third thermal coupling bias unit 43 and the third current amplification unit 63. The base series resistor R17 of the transistor TR20 is connected to the pin 5. The emitter series resistor R16 of the transistor TR20 is connected to the pin 12.

[0055] The first signal voltage amplifying unit 31 is provided with a transistor TR4 and a capacitor C1, the base of the transistor TR4 is connected in series with the capacitor C1 and the collector, the base of the transistor TR4 is connected to the collector of the transistor TR1, the collector of the transistor TR4 is connected to the first thermal coupling bias unit 41 and the first current amplifying unit 61, and the emitter of the transistor TR4 is connected to the pin 4.

[0056] The second signal voltage amplifying unit 32 is provided with a transistor TR11 and a capacitor C2, the base of the transistor TR11 is connected in series with the capacitor C2 and the collector, the base of the transistor TR11 is connected to the collector of the transistor TR15, the collector of the transistor TR11 is connected to the second thermal coupling bias unit 42 and the second current amplifying unit 62, and the emitter of the transistor TR11 is connected to the pin 4.

[0057] The third signal voltage amplifying unit 33 is provided with a transistor TR21 and a capacitor C3, the base of the transistor TR21 is connected in series with the capacitor C3 and the collector, the base of the transistor TR21 is connected to the collector of the transistor TR23, the collector of the transistor TR21 is connected to the third thermal coupling bias unit 43 and the third current amplifying unit 63, and the emitter of the transistor TR21 is connected to the pin 4.

[0058] The first thermal coupling bias unit 41 is provided with a transistor TR5-1, a transistor TR5-2, a resistor R3 and a resistor R5. The base of the transistor TR5-1 is connected in series with the resistor R3 and connected to the collector of the transistor TR4. The base of the transistor TR5-1 is also connected in series with the resistor R4 and connected to the collector of the transistor TR6. The collector of the transistor TR5-1 is connected to the collector of the transistor TR4. The collector of the transistor TR5-1 is also connected to the collector of the transistor TR5-2. The emitter of the transistor TR5-1 is connected to the base of the transistor TR5-2. The emitter of the transistor TR5-2 is connected to the collector of the transistor TR6.

[0059] The second thermal coupling bias unit 42 is provided with a transistor TR12-1, a transistor TR12-2, a resistor R11 and a resistor R12. The base of the transistor TR12-1 is connected in series with the resistor R11 and connected to the collector of the transistor TR11. The base of the transistor TR12-1 is also connected in series with the resistor R12 and connected to the collector of the transistor TR13. The collector of the transistor TR12-1 is connected to the collector of the transistor TR11. The collector of the transistor TR12-1 is also connected to the collector of the transistor TR12-2. The emitter of the transistor TR12-1 is connected to the base of the transistor TR12-2, and the emitter of the transistor TR12-2 is connected to the collector of the transistor TR13.

[0060] The third thermal coupling bias unit 43 is provided with a transistor TR19-1, a transistor TR19-2, a resistor R18 and a resistor R19. The base of the transistor TR19-1 is connected in series with the resistor R18 and connected to the collector of the transistor TR21. The base of the transistor TR19-1 is also connected in series with the resistor R19 and connected to the collector of the transistor TR20. The collector of the transistor TR19-1 is connected to the collector of the transistor TR21. The collector of the transistor TR19-1 is also connected to the collector of the transistor TR19-2. The emitter of the transistor TR19-1 is connected to the base of the transistor TR19-2, and the emitter of the transistor TR19-2 is connected to the collector of the transistor TR20.

[0061] The first current amplification unit 61 is provided with a chip TR7, a chip TR8 and a resistor R6. The base of the chip TR7 is connected in series with the resistor R6 and is connected to the collector of the transistor TR5-2. The collector of the chip TR7 is connected to the peripheral circuit as pin 8. The emitter of the chip TR7 is connected to the peripheral circuit as pin 6. The base of the chip TR8 is connected to the emitter of the transistor TR5-2. The collector of the chip TR8 is connected to the peripheral circuit as pin 9. The emitter of the chip TR8 is connected to the peripheral circuit as pin 7.

[0062] The second current amplification unit 62 is provided with a chip TR9, a chip TR10 and a resistor R8. The base of the chip TR9 is connected in series with the resistor R8 and is connected to the collector of the transistor TR12-2. The collector of the chip TR9 is connected to the pin 8. The emitter of the chip TR9 is connected to the peripheral circuit as the pin 10. The base of the chip TR10 is connected to the emitter of the transistor TR12-2. The collector of the chip TR10 is connected to the pin 9. The emitter of the chip TR10 is connected to the peripheral circuit as the pin 11.

[0063] The third current amplification unit 63 is provided with a chip TR17, a chip TR18 and a resistor R15. The base series resistor R15 of the chip TR17 is connected to the collector of the transistor TR19-2, the collector of the chip TR17 is connected to the pin 8, the emitter of the chip TR17 is connected to the peripheral circuit as the pin 18, the collector of the chip TR18 is connected to the pin 9, the collector of the chip TR18 is connected to the pin 9, and the emitter of the chip TR18 is connected to the peripheral circuit as the pin 18.

[0064] The circuit diagram of the peripheral circuit of the utility model is as follows Figure 2 As shown, the function of the peripheral circuit is to ensure the normal operation of the high-penetration audio amplifier circuit. However, the peripheral circuit is not the focus of the invention of the utility model, and will not be described in detail here.

[0065] The first amplifying module, the second amplifying module and the third amplifying module of the utility model are the same channel amplifying circuits. The working process of the high-penetration audio amplifier circuit is as follows: after the first amplifying module is powered normally, a 3.5V-5.5V DC voltage signal is actively provided to pin 5, so that the first constant current load bias unit 21 can function normally as a constant current; the audio input signal and the feedback signal are input from pin 1 and pin 2 respectively, and after amplification and input by the first signal differential input unit 11, the input signal is voltage amplified in the first signal voltage amplifying unit 31, and then prevented from oscillation by the advance compensation of the first advance compensation unit 51, and finally current amplified in the first current amplifying unit 61, and power output is performed to the external speaker. For the first thermal coupling bias unit 41, its main function is to thermally couple the two high-power output tubes of chip TR7 and chip TR8 in the high-heat first current amplifying unit 61, so that the circuit can always maintain a stable bias state and eliminate crossover distortion.

[0066] After the second amplifier module is powered normally, a 3.5V to 5.5V DC voltage signal is actively provided to pin 5, so that the second constant current load bias unit 22 can function normally as a constant current; the audio input signal and the feedback signal are input from pins 14 and 15 respectively, and after being amplified and input by the second signal differential input unit 12, the input signal is voltage-amplified in the second signal voltage amplifier unit 32, and then prevented from oscillation by the advance compensation of the second advance compensation unit 52, and finally current-amplified in the second current amplifier unit 62, and power output is performed to the external speaker. As for the second thermal coupling bias unit 42, its main function is to thermally couple the two high-power output tubes of chip TR9 and chip TR10 in the high-heat second current amplifier unit 62, so that the circuit can always maintain a stable bias state and eliminate crossover distortion.

[0067] After the third amplifier module is powered normally, a 3.5V-5.5V DC voltage signal is actively provided to pin 5, so that the third constant current load bias unit 23 can function normally as a constant current; the audio input signal and the feedback signal are input from pin 16 and pin 17 respectively, and after being amplified and input by the second signal differential mode input unit 12, the input signal is voltage amplified in the third signal voltage amplification unit 33, and then prevented from oscillation by the advance compensation of the third advance compensation unit 53, and finally current amplified in the third current amplification unit 63, and power output is performed to the external speaker. As for the third thermal coupling bias unit 43, its main function is to thermally couple the two high-power output tubes of the triode TR1 and the chip TR18 in the high-heat third current amplification unit 63, so that the circuit can always maintain a stable bias state and eliminate crossover distortion.

[0068] The high-penetration audio amplifier circuit of the utility model has three channels. Compared with the existing two-channel, an additional channel is added to drive one more speaker to increase the output by 50%, improve the volume of the sound, and spread the sound to a wider range, thereby improving the penetration.

[0069] The high-penetration audio amplifier circuit is provided with an amplifier module, each of which is a channel, that is, the utility model is provided with a three-channel output, which can effectively control the gain of each channel, making the output more balanced, so as to drive up to 3 speakers, achieve better stereo effects, stronger low-frequency response and higher-quality music experience, and can effectively improve the penetration of audio output, and greatly improve the stability and reliability of output power. Compared with the audio power amplifier circuit with dual-channel output in the prior art, the audio amplifier circuit of the utility model has higher penetration and is suitable for use in open outdoor environments.

[0070] Example 2

[0071] A high-penetration audio amplifier circuit, the other features of which are the same as those of Example 1, and also has the following features: a heat dissipation copper block is also provided, and chips TR7, TR8, TR9, TR10, TR17 and TR18 are all sintered with the heat dissipation copper block.

[0072] It should be noted that, because the current of chips TR7, chip TR8, chip TR9, chip TR10, chip TR17 and chip TR18 is relatively large, they are sintered with the heat dissipation copper block and then attached to the circuit board to achieve better heat dissipation effect.

[0073] The model of chip TR8, chip TR10, and chip TR18 is 2113P; the model of chip TR7, chip TR9, and chip TR17 is 2113N; the model of transistor TR4, transistor TR11, and transistor TR21 is ST5401; the model of transistor TR1, transistor TR2, transistor TR14, transistor TR15, transistor TR22, and transistor TR23 is FMW3; the model of transistor TR3, transistor TR5, transistor TR6, transistor TR12, transistor TR13, transistor TR16, transistor TR19, transistor TR20, and transistor TR24 is LBC846BWT1G; the model of resistor R5, resistor R10 and resistor R17 is 0603 / 10K / J; the model of resistor R1, resistor R13 and resistor R20 is 0603 / 1K / J; the model of resistor R4, resistor R12 and resistor R19 is 0603 / 2.4K / J; the model of resistor R3, resistor R11 and resistor R18 is 0603 / 4.7K / J; the model of resistor R2, resistor R7, resistor R9, resistor R14, resistor R16 and resistor R21 is 0603 / 470 / J; the model of capacitor C1, capacitor C2 and capacitor C3 is 0805 / 39PF / K / 50V.

[0074] Compared with Example 1, the present embodiment uses a heat dissipation copper block to timely dissipate the chips TR7-1, TR7-2, TR8-1, TR8-2, TR9-1, TR9-2, TR10-1, TR10-2, TR17-

[0075] 1. The heat generated by chip TR17-2, chip TR18-1 and chip TR18-2 is conducted to extend the service life of the high-penetration audio amplifier circuit.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit the protection scope of the utility model. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. A high-penetration audio amplifier circuit, characterized in that: A first amplifying module, a second amplifying module and a third amplifying module are provided, wherein the second amplifying module is connected to the first amplifying module and the third amplifying module respectively; The first amplification module is provided with a first signal differential mode input unit, a first constant current load bias unit, a first signal voltage amplification unit, a first thermal coupling bias unit, a first lead compensation unit and a first current amplification unit, the first signal differential mode input unit is respectively connected to the first constant current load bias unit and the first signal voltage amplification unit, the first signal voltage amplification unit is connected to the first thermal coupling bias unit and the first current amplification unit, the first thermal coupling bias unit is connected to the first current amplification unit and the first lead compensation unit; The second amplification module is provided with a second signal differential mode input unit, a second constant current load bias unit, a second signal voltage amplification unit, a second thermal coupling bias unit, a second lead compensation unit and a second current amplification unit, the second signal differential mode input unit is respectively connected to the second constant current load bias unit and the second signal voltage amplification unit, the second signal voltage amplification unit is connected to the second thermal coupling bias unit and the second current amplification unit, the second thermal coupling bias unit is connected to the second current amplification unit and the second lead compensation unit; The third amplification module is provided with a third signal differential mode input unit, a third constant current load bias unit, a third signal voltage amplification unit, a third thermal coupling bias unit, a third lead compensation unit and a third current amplification unit. The third signal differential mode input unit is respectively connected to the third constant current load bias unit and the third signal voltage amplification unit, the third signal voltage amplification unit is connected to the third thermal coupling bias unit and the third current amplification unit, and the third thermal coupling bias unit is connected to the third current amplification unit and the third lead compensation unit; The first signal differential input unit, the second signal differential input unit and the third signal differential input unit are connected, the first signal voltage amplification unit, the second signal voltage amplification unit and the third signal voltage amplification unit are connected, the first constant current load bias unit, the second constant current load bias unit and the third constant current load bias unit are connected, the first thermal coupling bias unit, the second thermal coupling bias unit and the third thermal coupling bias unit are connected, the first lead compensation unit, the second lead compensation unit and the third lead compensation unit are connected; the first current amplification unit, the second current amplification unit and the third current amplification unit are connected.

2. The high-penetration audio amplifier circuit according to claim 1, characterized in that: The first signal differential mode input unit is provided with a resistor R1, a transistor TR1 and a transistor TR2, one end of the resistor R1 is connected to the peripheral circuit as a pin 4, the other end of the resistor R1 is connected to the collector of the transistor TR1, the collector of the transistor TR1 is also connected to the first signal voltage amplification unit, the emitter of the transistor TR1 is connected to the emitter of the transistor TR2, the emitter of the transistor TR1 is connected to the first constant current load bias unit, the collector of the transistor TR2 is connected to the pin 4, the base of the transistor TR1 is connected to the peripheral circuit as a pin 1, and the base of the transistor TR2 is connected to the peripheral circuit as a pin 2; The second signal differential mode input unit is provided with a resistor R13, a transistor TR14 and a transistor TR15, one end of the resistor R13 is connected to the pin 4, the other end of the resistor R13 is connected to the collector of the transistor TR15, the collector of the transistor TR15 is also connected to the second signal voltage amplification unit, the emitter of the transistor TR15 is connected to the emitter of the transistor TR14, the emitter of the transistor TR15 is connected to the second constant current load bias unit, the collector of the transistor TR14 is connected to the pin 4, the base of the transistor TR15 is connected to the peripheral circuit as the pin 15, and the base of the transistor TR14 is connected to the peripheral circuit as the pin 14; The third signal differential mode input unit is provided with a resistor R20, a transistor TR22 and a transistor TR23, one end of the resistor R20 is connected to pin 4, the other end of the resistor R20 is connected to the collector of the transistor TR23, the collector of the transistor TR23 is also connected to the third signal voltage amplification unit, the emitter of the transistor TR23 is connected to the emitter of the transistor TR22, the emitter of the transistor TR23 is connected to the third constant current load bias unit, the collector of the transistor TR22 is connected to pin 4, the base of the transistor TR22 is connected to the peripheral circuit as pin 17, and the base of the transistor TR23 is connected to the peripheral circuit as pin 10.

3. The high-penetration audio amplifier circuit according to claim 2, characterized in that: The first constant current load bias unit is provided with a transistor TR3, a resistor R2, a diode D1-1 and a diode D1-2, the collector of the transistor TR3 is connected to the emitter of the transistor TR1, the emitter of the transistor TR3 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to the peripheral circuit as a pin 12, the base of the transistor TR3 is connected to the peripheral circuit as a pin 5, the base of the transistor TR3 is also connected to the positive electrode of the diode D1-1, the negative electrode of the diode D1-1 is connected to the positive electrode of the diode D1-2, and the negative electrode of the diode D1-2 is connected to the pin 12; The second constant current load bias unit is provided with a transistor TR16 and a resistor R14, the collector of the transistor TR16 is connected to the emitter of the transistor TR14, the emitter of the transistor TR16 is connected to one end of the resistor R14, the other end of the resistor R14 is connected to the pin 12, and the base of the transistor TR16 is connected to the pin 5; The third constant current load bias unit is provided with a transistor TR24 and a resistor R21, the collector of the transistor TR24 is connected to the emitter of the transistor TR23, the emitter of the transistor TR24 is connected to one end of the resistor R21, the other end of the resistor R21 is connected to the pin 12, and the base of the transistor TR23 is connected to the pin 5.

4. The high-penetration audio amplifier circuit according to claim 3, characterized in that: The first leading compensation unit is provided with a transistor TR5, a resistor R5 and a resistor R7, the collector of the transistor TR5 is connected to the first thermal coupling bias unit and the first current amplification unit, the base series resistor R5 of the transistor TR5 is connected to the pin 5, and the emitter series resistor R7 of the transistor TR5 is connected to the pin 12; The second leading compensation unit is provided with a transistor TR13, a resistor R9 and a resistor R10, the collector of the transistor TR13 is connected to the second thermal coupling bias unit and the second current amplification unit, the base series resistor R10 of the transistor TR13 is connected to the pin 5, and the emitter series resistor R9 of the transistor TR13 is connected to the pin 12; The third leading compensation unit is provided with a transistor TR20, a resistor R16 and a resistor R17, the collector of the transistor TR20 is connected to the third thermal coupling bias unit and the third current amplification unit, the base series resistor R17 of the transistor TR20 is connected to pin 5, and the emitter series resistor R16 of the transistor TR20 is connected to pin 12.

5. The high-penetration audio amplifier circuit according to claim 4, characterized in that: The first signal voltage amplifying unit is provided with a transistor TR4 and a capacitor C1, the base of the transistor TR4 is connected in series with the capacitor C1 and the collector, the base of the transistor TR4 is connected to the collector of the transistor TR1, the collector of the transistor TR4 is connected to the first thermal coupling bias unit and the first current amplifying unit, and the emitter of the transistor TR4 is connected to the pin 4; The second signal voltage amplifying unit is provided with a transistor TR11 and a capacitor C2, the base of the transistor TR11 is connected in series with the capacitor C2 and the collector, the base of the transistor TR11 is connected to the collector of the transistor TR15, the collector of the transistor TR11 is connected to the second thermal coupling bias unit and the second current amplifying unit, and the emitter of the transistor TR11 is connected to the pin 4; The third signal voltage amplifying unit is provided with a transistor TR21 and a capacitor C3, the base of the transistor TR21 is connected in series with the capacitor C3 and the collector, the base of the transistor TR21 is connected to the collector of the transistor TR23, the collector of the transistor TR21 is connected to the third thermal coupling bias unit and the third current amplifying unit, and the emitter of the transistor TR21 is connected to pin 4.

6. The high-penetration audio amplifier circuit according to claim 5, characterized in that: The first thermal coupling bias unit is provided with a transistor TR5-1, a transistor TR5-2, a resistor R3 and a resistor R5, the base of the transistor TR5-1 is connected in series with the resistor R3 and connected to the collector of the transistor TR4, the base of the transistor TR5-1 is also connected in series with the resistor R4 and connected to the collector of the transistor TR6, the collector of the transistor TR5-1 is connected to the collector of the transistor TR4, the collector of the transistor TR5-1 is also connected to the collector of the transistor TR5-2, the emitter of the transistor TR5-1 is connected to the base of the transistor TR5-2, and the emitter of the transistor TR5-2 is connected to the collector of the transistor TR6; The second thermal coupling bias unit is provided with a transistor TR12-1, a transistor TR12-2, a resistor R11 and a resistor R12, the base of the transistor TR12-1 is connected in series with the resistor R11 and connected to the collector of the transistor TR11, the base of the transistor TR12-1 is also connected in series with the resistor R12 and connected to the collector of the transistor TR13, the collector of the transistor TR12-1 is connected to the collector of the transistor TR11, the collector of the transistor TR12-1 is also connected to the collector of the transistor TR12-2, the emitter of the transistor TR12-1 is connected to the base of the transistor TR12-2, and the emitter of the transistor TR12-2 is connected to the collector of the transistor TR13; The third thermal coupling bias unit is provided with a transistor TR19-1, a transistor TR19-2, a resistor R18 and a resistor R19. The base of the transistor TR19-1 is connected in series with the resistor R18 and connected to the collector of the transistor TR21. The base of the transistor TR19-1 is also connected in series with the resistor R19 and connected to the collector of the transistor TR20. The collector of the transistor TR19-1 is connected to the collector of the transistor TR21. The collector of the transistor TR19-1 is also connected to the collector of the transistor TR19-2. The emitter of the transistor TR19-1 is connected to the base of the transistor TR19-2, and the emitter of the transistor TR19-2 is connected to the collector of the transistor TR20.

7. The high-penetration audio amplifier circuit according to claim 6, characterized in that: The first current amplifying unit is provided with a chip TR7, a chip TR8 and a resistor R6, the base of the chip TR7 is connected in series with the resistor R6 and connected to the collector of the transistor TR5-2, the collector of the chip TR7 is connected to the peripheral circuit as a pin 8, the emitter of the chip TR7 is connected to the peripheral circuit as a pin 6, the base of the chip TR8 is connected to the emitter of the transistor TR5-2, the collector of the chip TR8 is connected to the peripheral circuit as a pin 9, and the emitter of the chip TR8 is connected to the peripheral circuit as a pin 7; The second current amplifying unit is provided with a chip TR9, a chip TR10 and a resistor R8, the base of the chip TR9 is connected in series with the resistor R8 and the collector of the transistor TR12-2, the collector of the chip TR9 is connected to the pin 8, the emitter of the chip TR9 is connected to the peripheral circuit as the pin 10, the base of the chip TR10 is connected to the emitter of the transistor TR12-2, the collector of the chip TR10 is connected to the pin 9, and the emitter of the chip TR10 is connected to the peripheral circuit as the pin 11; The third current amplification unit is provided with chip TR17, chip TR18 and resistor R15, the base series resistor R15 of chip TR17 is connected to the collector of transistor TR19-2, the collector of chip TR17 is connected to pin 8, the emitter of chip TR17 is connected to the peripheral circuit as pin 18, the collector of chip TR18 is connected to pin 9, the collector of chip TR18 is connected to pin 9, and the emitter of chip TR18 is connected to the peripheral circuit as pin 18.

8. The high-penetration audio amplifier circuit according to claim 7, characterized in that: A heat dissipation copper block is also provided, and the chip TR7, the chip TR8, the chip TR9, the chip TR10, the chip TR17 and the chip TR18 are all sintered with the heat dissipation copper block.

9. The high-penetration audio amplifier circuit according to claim 8, characterized in that: The model of chip TR8, chip TR10, and chip TR18 is 2113P; The model of chip TR7, chip TR9 and chip TR17 is 2113N; The model of transistor TR4, transistor TR11 and transistor TR21 is ST5401; The model of transistors TR1, TR2, TR14, TR15, TR22 and TR23 is FMW3; The model of transistor TR3, transistor TR5-1, transistor TR5-2, transistor TR6, transistor TR12-1, transistor TR12-2, transistor TR13, transistor TR16, transistor TR19-1, transistor TR19-2, transistor TR20 and transistor TR24 is LBC846BWT1G; The model of resistor R5, resistor R10 and resistor R17 is 0603 / 10K / J; the model of resistor R1, resistor R13 and resistor R20 is 0603 / 1K / J; The models of resistors R4, R12 and R19 are 0603 / 2.4K / J; The models of resistors R3, R11 and R18 are 0603 / 4.7K / J; The models of resistors R2, R7, R9, R14, R16 and R21 are 0603 / 470 / J; The models of capacitor C1, capacitor C2 and capacitor C3 are 0805 / 39PF / K / 50V.

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