CN217643155U

CN217643155U - 65W small-volume sound box power supply circuit

Info

Publication number: CN217643155U
Application number: CN202221730087.4U
Authority: CN
Inventors: 罗维
Original assignee: Shenzhen Gang Cheung Fair Electronics Co ltd
Current assignee: Shenzhen Gang Cheung Fair Electronics Co ltd
Priority date: 2022-07-05
Filing date: 2022-07-05
Publication date: 2022-10-21
Anticipated expiration: 2032-07-05

Abstract

The utility model discloses a 65W small-size sound box power supply circuit, which comprises a power grid L, a power grid N and a PWM control chip, wherein the power grid L is connected with a discharging unit, the discharging unit is connected with a voltage stabilizing unit, and the voltage stabilizing unit is connected with a peak absorption loop unit; wherein: the voltage stabilizing unit is including connecting the rectifier bridge BG1 of the unit that discharges, rectifier DB1 is used for becoming the direct current with the alternating current rectification, rectifier BG 1's the output positive pole links to each other and is connected with transformer T1's main coil input with electric capacity EC1, electric capacity EC2, electric capacity EC 3's positive pole and is used for providing electric power for transformer T1, transformer T1 main winding's output and switch tube Q1's drain electrode are connected, the utility model discloses a SSR's chip scheme, stability is high, and is efficient, stand-by power consumption is little, and the synchronous rectification is adopted in the output rectification.

Description

65W small-volume sound box power supply circuit

Technical Field

The utility model relates to an intelligence audio amplifier technical field specifically is 65W little volume audio amplifier power supply circuit.

Background

The scene that intelligent audio amplifier used in each occasion constantly increases to because small-size electronic product all is a consumer, the demand has a long-term stable market demand when steadily increasing, and supporting power also has a more stable demand.

In the prior art, the current required by a sound box product at the starting moment and when bass is played is 3 times or even more than that of normal operation, but the duration time of the sound box product is only ten milliseconds, and the current mainstream method in the current sound box power supply market is to amplify an overcurrent point so that the overcurrent point is more than 3 times of rated current. This makes the cost of the power supply relatively high with a certain risk. Meanwhile, due to the popularization of the intelligent sound box, the requirement of consumers on appearance and volume is higher, and therefore a 65W small-volume sound box power circuit is provided for solving the problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a 65W little volume audio amplifier power supply circuit to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the 65W small-volume sound box power supply circuit comprises a power grid L, a power grid N and a PWM control chip, wherein the power grid L is connected with a discharge unit, the discharge unit is connected with a voltage stabilizing unit, and the voltage stabilizing unit is connected with a peak absorption loop unit;

wherein: the voltage stabilizing unit comprises a rectifier bridge BG1 connected with the discharging unit, the rectifier bridge BG1 is used for rectifying alternating current into direct current, the positive electrode of the output end of the rectifier bridge BG1 is connected with the positive electrodes of a capacitor EC1, a capacitor EC2 and a capacitor EC3 and is connected with the input end of a main coil of a transformer T1 for supplying power to the transformer T1, the output end of a main winding of the transformer T1 is connected with the drain electrode of a switch tube Q1, a resistor R3 and a resistor R3C are connected in parallel on a source electrode connecting line of the switch tube Q1 and are used for returning the current of the main winding of the transformer T1 to the negative electrode of the capacitor EC3, a resistor R4 and a resistor R4A are connected on an output end positive electrode connecting line of the rectifier bridge BG1, the free end of the resistor R4A is connected with the capacitor EC4, the resistor R4A is connected with a fifth pin of the capacitor EC4 and is used for supplying voltage to the chip U1 when the power is powered on, the grid of the switch tube Q1 is connected with a resistor R8 and a resistor R9, the resistor R9 is connected with a diode D3 in parallel, the resistor R8, the resistor R9 and the diode D3 are used for controlling the on and off of a switch tube Q1, the output end of the rectifier bridge BG1 is connected with an inductor T1-A in parallel on a drain electrode connecting line of the switch tube Q1, the output end of the inductor T1-A is connected with a switch tube Q2, a capacitor EC5 and a capacitor EC6 are connected in parallel on a connecting line of the switch tube Q2, a resistor R23 and a capacitor C7 are connected in parallel on the switch tube Q2, a resistor R23A is connected in parallel on the resistor R23, a resistor R19 is connected on a connecting line of the switch tube Q2 connecting chip U2, a capacitor C10 is connected in parallel on the switch tube Q2 connecting chip U2 and is used for providing energy required by the operation for the chip U2, a resistor R22 is connected on a connecting line of the switch tube Q2, a free end of the resistor R22 is connected with a U3A and is used for providing stable voltage for the U3A, and a resistor R16 and a resistor R17 are connected on a connecting line of the switch tube Q2, the free end of the resistor R17 is connected with U4.

Preferably, the unit of discharging is including the resistance fuse F1 who connects the electric wire netting L line, resistance fuse F1 free end is connected piezo-resistor MOV1 one end and thermistor NTC one end, common mode inductance LF1 input is connected to thermistor NTC's free end, electric wire netting N line is connected with common mode inductance LF1 input after linking to each other with piezo-resistor MOV1, two feet of output of common mode inductance LF1 link to each other with X electric capacity CX1 respectively, X electric capacity CX1 one end links to each other with resistance R12, R14 one end, resistance R12, resistance R14 other end link to each other with resistance R13, resistance R15 one end respectively, X electric capacity CX 1's the other end and connect common mode inductance LF2 are connected to resistance R13, resistance R15's the other end, resistance R12, resistance R13, resistance R14, resistance R15 constitute the network of discharging and are used for X electric capacity CX 1's voltage discharges to safe voltage fast.

Preferably, the spike absorption loop unit comprises one end of an auxiliary winding of the transformer T1 connected to one end of the resistor R5, the other end of the resistor R5 is connected to the positive end of the diode D2, the negative end of the diode D2 is connected to the positive electrode of the capacitor EC4 and the capacitor C2, and is connected to the fifth pin of the chip U1 and used for providing a voltage for the chip U1 to normally operate, and the third pin of the chip U1 is connected to the resistor R11 and used for adjusting the operating frequency of the chip U1. The seventh pin of the chip U1 is connected to the negative electrode of the EC2 for the reference ground of the chip, the positive end of the diode D1 is connected with the drain electrode of the Q1 and the output end of the primary winding of the transformer T1, the negative end of the diode D1 is connected with one end of the resistor R2 and one end of the resistor R2A, the other ends of the resistor R2 and the resistor R2A are connected with a parallel network formed by the resistor R1, the resistor R1A, the resistor R1B and the capacitor C1, the other end of the parallel network formed by the resistor R1, the resistor R1A, the resistor R1B and the capacitor C1 is connected to the positive end of the capacitor EC3, and the model of the chip U1 is G1610.

Preferably, the type of the rectifier bridge BG1 is GBU606, the main winding of the transformer T1 is used for storing energy when the switching tube Q1 is turned on, the main winding of the transformer is used for releasing energy when the switching tube Q1 is turned off, and the type of the chip U2 is G3602.

Preferably, the phases of the primary winding and the secondary winding of the transformer T1 are opposite, the type of the transformer T1 is PQ2620, the type of the U3A is an opto-coupler EL817, and the type of the U4 is a chip TL431.

Preferably, the resistor R23, the resistor 23A and the capacitor C7 form an RC network for suppressing a peak for the switching tube Q1 so that the switching tube Q1 operates within a safe voltage range.

Preferably, the spike absorption loop unit is used for ensuring that the switching tube Q1 operates within a safe voltage range.

Preferably, a capacitor C6 is connected between the drain and the source of the switching tube Q1 in parallel, a negative electrode of the capacitor EC3 is connected to one end of CY1, the other end of CY1 is connected to a negative electrode of the secondary output, and CY1 is a Y capacitor CY1.

Preferably, two ends of the capacitor EC6 are connected to a common mode inductor LF3, and the other end of the common mode inductor LF3 is connected to the output V +/V-.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the chip scheme adopting SSR has high stability, high efficiency and low standby power consumption.

2. Except for a plurality of large-size devices such as a transformer, a filter, a capacitor, a fuse, a power MOS (metal oxide semiconductor), a control chip and the like, other small-power resistors, capacitors and secondary synchronous rectification ICs (integrated circuits) adopt an SMT (surface mount technology) process, so that the production efficiency is improved, and the consistency of the production quality is ensured.

And 3, synchronous rectification is adopted for output rectification, so that the high-efficiency and low-temperature rise are realized.

4. The G1610 chip is a Peakload function initiated in the industry, and can meet the requirement that the transient power reaches more than 300% of rated power on the premise of extremely low cost of the whole machine.

5. The input end is connected with the piezoresistor, so that the damage of lightning to the power supply and the post-stage equipment is effectively prevented, and the reliability of the power supply is improved.

Drawings

FIG. 1 is a schematic circuit diagram of the present invention;

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: the 65W small-volume sound box power supply circuit comprises a power grid L, a power grid N and a PWM control chip, wherein the power grid L is connected with a discharge unit, the discharge unit is connected with a voltage stabilizing unit, and the voltage stabilizing unit is connected with a peak absorption loop unit;

wherein: the voltage stabilizing unit comprises a rectifier bridge BG1 connected with the discharging unit, the rectifier bridge BG1 is used for rectifying alternating current into direct current, the positive electrode of the output end of the rectifier bridge BG1 is connected with the positive electrodes of a capacitor EC1, a capacitor EC2 and a capacitor EC3 and is connected with the input end of a main coil of a transformer T1 for supplying power to the transformer T1, the output end of a main winding of the transformer T1 is connected with the drain electrode of a switching tube Q1, a resistor R3 and a resistor R3C are connected in parallel on a source electrode connecting line of the switching tube Q1 and are used for returning current of the main winding of the transformer T1 to the negative electrode of the capacitor EC3, a resistor R4 and a resistor R4A are connected on an output end positive electrode connecting line of the rectifier bridge BG1, the free end of the resistor R4A is connected with the capacitor EC4, the resistor R4A is connected with a fifth pin of the capacitor EC1 and is used for supplying voltage to the chip U1 when the power is powered on, and after the chip U1 is normally started to work, a controllable square wave is output at the 6 pin of the U1, the on-off of a switch tube Q1 is controlled by resistors R8 and R9 and a diode D3, the model of a chip U1 is G1610, the grid electrode of the switch tube Q1 is connected with the resistor R8 and the resistor R9, the resistor R9 is connected with the diode D3 in parallel, the resistor R8, the resistor R9 and the diode D3 are used for controlling the on-off of the switch tube Q1, the output end of a rectifier bridge BG1 is connected with a drain electrode of the switch tube Q1 in parallel with an inductor T1-A, the output end of the inductor T1-A is connected with a switch tube Q2, the connecting line of the switch tube Q2 is connected with a capacitor EC5 and a capacitor EC6 in parallel, the switch tube Q2 is connected with a resistor R23 and a capacitor C7 in parallel, the resistor R23A is connected with the resistor R23A in parallel, the connecting line of the switch tube Q2 is connected with a resistor R19, the switch tube Q2 is connected with a chip U2 and is connected with a capacitor C10 in parallel with the chip U2 and used for providing energy required by the work for the chip U2, the connecting line of the switch tube Q2 is connected with a resistor R22, and a resistor R3A 22 and used for providing stable voltage for the U3A, a resistor R16 and a resistor R17 are connected to a connecting wire of a switch tube Q2, the free end of the resistor R17 is connected with a U4 and used for stabilizing voltage, a capacitor EC3 is connected with a U3B, the negative electrode of the capacitor EC 3B is grounded, the output end of the U3B is connected with a second pin of a chip U1, the model of a rectifier bridge BG1 is GBU606, a main winding of a transformer T1 is used for storing energy when the switch tube Q1 is switched on, the main winding of the transformer is used for releasing energy when the switch tube Q1 is switched off, the model of the chip U2 is G3602, the main winding of the transformer is used for releasing energy according to the Lenz law of an inductance coil when the switch tube Q1 is switched off, and a resistor R23, a resistor 23A and a capacitor C7 form an RC network which is used for inhibiting peaks for the switch tube Q1 to enable the switch tube Q1 to work in a safe voltage range and improve EMI effect, the phase of a main winding of a transformer T1 is opposite to that of a secondary winding, the type of the transformer T1 is PQ2620, the type of a U3A is an optoelectronic coupler is EL817, the type of a U4 is TL431, after the detection of the chip U2, a high level is output at 5 pins at the same time to enable a switching tube Q2 to be conducted, capacitors EC5 and EC6 are charged to release energy for an output end, a capacitor C6 is connected between a drain electrode and a source electrode of the switching tube Q1 in parallel, the negative electrode of the capacitor EC3 is connected with one end of a CY1, the other end of the CY1 is connected with the negative electrode of a secondary output, the CY1 is a Y capacitor CY1 which is used as a low-resistance passage of power switch noise to improve the EMI effect, two ends of the capacitor EC6 are connected with a common mode inductor LF3, the other end of the common mode inductor LF3 is connected with an output V +/V-, common mode interference signals output by a power supply are reduced, and the EMI effect is improved.

The unit that discharges is including the resistance fuse F1 who connects the electric wire netting L line, resistance fuse F1 free end connects piezo-resistor MOV1 one end and thermistor NTC one end, common mode inductance LF1 input is connected to thermistor NTC's free end, electric wire netting N line is connected with the input of common mode inductance LF1 after linking to each other with piezo-resistor MOV1, two feet of output of common mode inductance LF1 link to each other with X electric capacity CX1 respectively, X electric capacity CX1 one end and resistance R12, R14 one end links to each other, resistance R12, resistance R14 other end respectively with resistance R13, resistance R15 one end links to each other, resistance R13, the other end of X electric capacity CX1 is connected to the other end of resistance R15 and common mode inductance LF2 is connected, resistance R12, resistance R13, resistance R14, resistance R15 constitutes the network that discharges and is used for the voltage of X electric capacity CX1 to discharge to the safe voltage fast.

The peak absorption loop unit is used for ensuring that the switching tube Q1 works in a safe voltage range and improving the EMI effect, the peak absorption loop unit comprises one end of an auxiliary winding of a transformer T1 and one end of a resistor R5, the other end of the resistor R5 is connected with the positive end of a diode D2, the negative end of the diode D2 is connected with the positive electrode of a capacitor EC4 and a capacitor C2, is connected with a fifth pin of the chip U1 and is used for providing a voltage for the chip U1 to normally work, and the third pin of the chip U1 is connected with a resistor R11 and is used for adjusting the working frequency of the chip U1. The seventh pin of the chip U1 is connected to the cathode of the EC2 as the reference ground of the chip, the positive end of the diode D1 is connected with the drain electrode of the Q1 and the output end of the primary winding of the transformer T1, the negative end of the diode D1 is connected with one end of the resistor R2 and one end of the resistor R2A, the other ends of the resistor R2 and the resistor R2A are connected with a parallel network formed by the resistor R1, the resistor R1A, the resistor R1B and the capacitor C1, and the other end of the parallel network formed by the resistor R1, the resistor R1A, the resistor R1B and the capacitor C1 is connected to the positive end of the capacitor EC 3.

After alternating current is rectified and filtered, a controllable square wave is generated by a power chip G1610 to control the switching on of a switching tube, meanwhile, the output end of a power device is connected with a primary main winding of a transformer, higher voltage is reduced to safety voltage required by people through the transformer, the high voltage is rectified by a secondary synchronous rectifier and filtered by an output electrolytic capacitor to form 20V direct current voltage, and the output voltage is connected to an output line to supply power for sound equipment; g1610 can adjust the working frequency according to the detected current signal to ensure that the output voltage is relatively fixed on a stable value under different loads; by adjusting the resistance set by G1610, the working frequency of G1610 under different loads can be set; g1610 can stably work for 40mS at 300% of rated output current;

the core of the circuit is that a PWM control chip G1610 generates a controllable square wave, the square wave controls the power MOS to be switched on to enable the electromagnetic coupling of a primary winding and a secondary winding in a transformer, the high voltage after alternating current rectification is reduced to required safe low voltage, and a stable 20V direct current voltage is output after the rectification and the filtering of an output synchronous rectifier; the output adopts a special CCM synchronous rectification mode, the synchronous rectification has the characteristic of wide output voltage range, and the safe direct-current voltage output DC line after rectification and filtration supplies power to the electronic product. When the output current reaches 300% of the rated current instantaneously, the PWM controller G1610 enters a frequency-doubled operating state to output sufficient current and maintain the required time.

And 3, synchronous rectification is adopted for output rectification, and the method has the characteristics of high efficiency and low temperature rise.

5. The input end is connected with the piezoresistor, so that the damage of lightning stroke to the power supply and the post-stage equipment is effectively prevented, and the reliability of the power supply is improved.

Table 1 shows the product test report

TABLE 1

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

Claims

1.65W little volume audio amplifier power supply circuit, including electric wire netting L, electric wire netting N and PWM control chip, its characterized in that: the power grid L is connected with a discharge unit, the discharge unit is connected with a voltage stabilizing unit, and the voltage stabilizing unit is connected with a peak absorption loop unit;

2. A 65W small volume speaker power supply circuit as in claim 1, wherein: the unit of discharging is including the resistance fuse F1 who connects the electric wire netting L line, resistance fuse F1 free end is connected piezo-resistor MOV1 one end and thermistor NTC one end, common mode inductance LF1 input is connected to thermistor NTC's free end, electric wire netting N line is connected with common mode inductance LF1 input after connecting with piezo-resistor MOV1, two feet of output of common mode inductance LF1 link to each other with X electric capacity CX1 respectively, X electric capacity CX1 one end links to each other with resistance R12, R14 one end, resistance R12, resistance R14 other end link to each other with resistance R13, resistance R15 one end respectively, X electric capacity CX 1's the other end and connect common mode inductance LF2 are connected to resistance R13, resistance R15's the other end, resistance R12, resistance R13, resistance R14, resistance R15 constitute the network of discharging and are used for the quick discharge of the voltage to safe voltage of X electric capacity CX 1.

3. A 65W low-volume speaker power supply circuit as claimed in claim 1, wherein: the peak absorption loop unit comprises a transformer T1, wherein one end of an auxiliary winding of the transformer T1 is connected with one end of a resistor R5, the other end of the resistor R5 is connected with the positive end of a diode D2, the negative end of the diode D2 is connected with the positive electrode of a capacitor EC4 and a capacitor C2, is connected with the fifth pin of the chip U1 and is used for providing normal working voltage for the chip U1, a resistor R11 is connected onto the third pin of the chip U1 and is used for adjusting the working frequency of the chip U1, the seventh pin of the chip U1 is connected to the negative electrode of the EC2 in a reference mode of the chip, the positive end of the diode D1 is connected with the drain electrode of the Q1 and the output end of a main winding of the transformer T1, the negative end of the diode D1 is connected with one end of a resistor R2 and a resistor R2A, the other end of the resistor R2 and the other end of the resistor R1A are connected with a parallel network consisting of a resistor R1, a resistor R1B and a capacitor C1B, the other end of the parallel network consisting of the capacitor C1 is connected with the positive end of a capacitor EC3, and the chip U1 is connected with the type of the chip G1610.

4. A 65W low-volume speaker power supply circuit as claimed in claim 1, wherein: the type of the rectifier bridge BG1 is GBU606, the main winding of the transformer T1 is used for storing energy when the switch tube Q1 is switched on, the main winding of the transformer is used for releasing energy when the switch tube Q1 is switched off, and the type of the chip U2 is G3602.

5. A 65W low-volume speaker power supply circuit as claimed in claim 1, wherein: the phase of the primary winding and the phase of the secondary winding of the transformer T1 are opposite, the type of the transformer T1 is PQ2620, the type of the U3A is an optoelectronic coupler EL817, and the type of the U4 is a chip TL431.

6. A 65W low-volume speaker power supply circuit as claimed in claim 1, wherein: the resistor R23, the resistor 23A and the capacitor C7 form an RC network for restraining a peak for the switching tube Q1 so that the switching tube Q1 can work within a safe voltage range.

7. A 65W low-volume speaker power supply circuit as claimed in claim 1, wherein: the peak absorption loop unit is used for ensuring that the switching tube Q1 works in a safe voltage range.

8. A 65W low-volume speaker power supply circuit as claimed in claim 1, wherein: and a capacitor C6 is connected between the drain electrode and the source electrode of the switch tube Q1 in parallel, the negative electrode of the capacitor EC3 is connected with one end of the CY1, the other end of the CY1 is connected with the negative electrode of the secondary output, and the CY1 is a Y capacitor CY1.

9. A 65W small volume speaker power supply circuit as in claim 1, wherein: and two ends of the capacitor EC6 are connected with a common-mode inductor LF3, and the other end of the common-mode inductor LF3 is connected with an output V +/V-.