CN117081514A - Power supply system of digital audio power amplifier - Google Patents
Power supply system of digital audio power amplifier Download PDFInfo
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- CN117081514A CN117081514A CN202311095940.9A CN202311095940A CN117081514A CN 117081514 A CN117081514 A CN 117081514A CN 202311095940 A CN202311095940 A CN 202311095940A CN 117081514 A CN117081514 A CN 117081514A
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- 230000001276 controlling effect Effects 0.000 claims abstract description 8
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- 239000003990 capacitor Substances 0.000 claims description 66
- 238000002955 isolation Methods 0.000 claims description 31
- 230000000087 stabilizing effect Effects 0.000 claims description 10
- 230000003287 optical effect Effects 0.000 claims description 6
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/007—Protection circuits for transducers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Acoustics & Sound (AREA)
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- Amplifiers (AREA)
Abstract
The invention discloses a power supply system of a digital audio power amplifier, and relates to the technical field of power supply design; the digital audio power amplifier comprises a switch power supply module, a digital audio power amplifier and a control module, wherein the switch power supply module is used for providing an adjustable power supply for the digital audio power amplifier and the control module; the detection module is used for detecting the voltage, the current and the temperature of the output end of the switching power supply module in real time and sending the detected voltage, the detected current and the detected temperature to the MCU control module; the detection module is connected with the output end of the switching power supply module; the MCU control module is used for regulating and controlling the output power of the switching power supply module according to the voltage, the current and the temperature and regulating and controlling the output power of the digital audio power amplifier according to the voltage, the current and the temperature; the output of the switch power supply module and the output of the digital audio power amplifier are controlled in a rated power range through the detection module and the MCU control module, and when the low-impedance loudspeaker of the digital audio power amplifier causes overlarge current, the power of the loudspeaker is not matched with the power supply voltage and the temperature is overlarge, the current limiting control is timely carried out, so that the stability of the system is ensured.
Description
Technical Field
The invention relates to the technical field of power supply design, in particular to a power supply system of a digital audio power amplifier.
Background
The digital audio power amplifier system reliability design device is frequently touched in the using process and has the advantages that the temperature in the digital audio power amplifier system is too high, the current is too high due to the fact that a low-impedance loudspeaker and an output short circuit are arranged, the power section of the loudspeaker is not matched with a power supply system, and the digital audio power amplifier system reliability design device is controlled by a switching power supply constant-current module, a constant-voltage module, a fault detection module, a temperature detection module, an MCU control module and a display screen controller, so that the power limitation and the safe normal working operation of the power amplifier are achieved, and the reliability of the whole system is improved.
For example, 1: the power amplifier is used for designing a loudspeaker with rated power of 3000W (PO) =2×1500W/4Ω (voltage) The current is 2× (77.5V/4 Ω) =38.75a), the voltage and current of the power amplifier are known, the voltage and current required to be output by the switching power supply module are obtained, (the voltage is 2× (77.5V/1.414) =2×110 vdc=220 Vdc), the power is 220v×14.5a=3190w and is larger than 3000W of the power amplifier, when the output of the power amplifier is connected with<4 omega speaker, such as 2× ((77.5 v) 2 The power rating of the switching power supply output 3190W is exceeded by/3Q) =4000W, and the switching power supply module is difficult to withstand such a large power.
For example 2: when the rated power 3190W continuously works and the temperature exceeds 80 ℃, the system is dangerous or even damaged when the rated power 3190W continuously works at a high temperature, the temperature is reduced by a power reduction mode (for example, 1500W), the power is increased when the temperature is reduced, and the stability of the whole system is ensured by the change of the temperature along with the power. For example 3: when the power segment of the speaker is not matched with the power supply system, the power amplifier requires a 2000W (PO) 2×1000W/4Ω speaker, and outputs a voltage (voltage Current 2X (63.3V/4 Ω) =31.65a), the required current voltage is set by the LCD display controller to the power supply system of the power amplifier.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: when the digital audio power amplifier has overcurrent and overhigh temperature, the reliability design device of the existing digital power amplifier to the system can not well play a role in stabilizing the digital power amplifier, the invention aims to provide a power supply system of the digital audio power amplifier, which is structurally improved on the basis of the power supply technology of the existing digital audio power amplifier, and the output of a switch power supply module and the digital audio power amplifier is controlled in a rated power range through the cooperation of a detection module and an MCU control module, so that the stability of the system is ensured.
The invention is realized by the following technical scheme:
the present solution provides a power supply system of a digital audio power amplifier, comprising:
the switch power supply module is used for providing an adjustable power supply for the digital audio power amplifier, the control module and the display module;
the detection module is used for detecting the voltage, the current and the temperature of the output end of the switching power supply module in real time and sending the detected voltage, the detected current and the detected temperature to the MCU control module; the detection module is connected with the output end of the switching power supply module;
and the MCU control module is used for regulating and controlling the output power of the switching power supply module according to the voltage, the current and the temperature and regulating and controlling the output power of the digital audio power amplifier according to the voltage, the current and the temperature.
The working principle of the scheme is as follows: the detection module regulates and controls the output power of the switching power supply module through the MCU control module to perform current limiting control when detecting that the power supply voltage of the switching power supply module is not matched with the power of the digital audio power amplifier and the temperature is too high; when the system has the problems that the digital audio power amplifier is over-current and has over-high temperature, the power section of the loudspeaker is not matched with the power supply system, and the like, the reliability design device of the existing digital power amplifier on the system can not well play a role in stabilizing the digital power amplifier through the system; the power supply system of the digital audio power amplifier is structurally improved on the basis of the existing digital audio power amplifier power supply technology, the switching power supply module and the digital audio power amplifier are controlled within the rated power range through the cooperation of the detection module and the MCU control module, and current limiting control is timely carried out when the low-impedance loudspeaker of the digital audio power amplifier causes overlarge current, the power and the power supply voltage of the loudspeaker are not matched and the temperature is overlarge, so that the stability of the system is ensured.
The further optimization scheme is that the method further comprises the following steps: the device comprises a constant current control module, a constant voltage control module and an LCD display module;
the LCD display module is used for displaying the output power of the digital audio power amplifier and is connected with the MCU control module; the MCU control module regulates and controls the output power of the switching power supply module according to the output power of the LCD display module display digital audio power amplifier;
the MCU control module is connected with the switching power supply module through the constant current control module and regulates and controls the current of the switching power supply module;
the MCU control module is connected with the switching power supply module through the constant voltage control module and regulates and controls the voltage of the switching power supply module.
The further optimization scheme is that the method further comprises the following steps: an isolation diode, a first optocoupler U1 and a second optocoupler U2;
the MCU control module is connected to the switching power supply module through a second optical coupler U2;
the constant current control module and the constant voltage control module are respectively connected with the cathode of an isolation diode, and the anode of the isolation diode is connected with the first optical coupler U1.
The further optimization scheme is that the circuit structure of the constant voltage control module is as follows: positive connection of isolation diode
One end of the resistor R22 is connected with the first cathode of the isolation diode, and the other end of the resistor R is connected with the output end of the operational amplifier U12A; the positive electrode input end of the operational amplifier U12A is connected with a resistor R19 in series and then is connected to the MCU control module; one end of the capacitor C11 is connected with the positive electrode input end of the operational amplifier U12A, and the other end of the capacitor C is grounded;
the negative electrode input end of the operational amplifier U12A is connected with the capacitor C9 and the resistor R21 in series and then connected with the output end of the operational amplifier U12, one end of the capacitor C8 is connected with the output end of the operational amplifier U12A, and the other end of the capacitor C8 is connected with the negative electrode input end of the operational amplifier U12A;
the voltage source of 100V-220V is connected with the resistor R28 and the resistor R17 in series and then is connected with the negative input end of the operational amplifier U12A, and a serial branch consisting of the capacitor C12A and the resistor R18 is connected with two sides of the resistor R17 in parallel; one end of the resistor R20 is connected with the negative input end of the operational amplifier U12A, and the other end is grounded.
The further optimization scheme is that the circuit structure of the constant current control module is as follows:
one end of the resistor R27 is connected with the second cathode of the isolation diode, the other end of the resistor R27 is connected with the output end of the operational amplifier U12B, the positive input end of the operational amplifier U12B is connected with the MCU control module in series with the resistor R24, and the negative input end of the operational amplifier U12B is connected with the current acquisition module in series with the resistor R23; one end of the capacitor C15 is connected with the positive electrode input end of the operational amplifier U12B, and the other end of the capacitor C is grounded;
the negative input end of the operational amplifier U12B is connected with the resistor R23 and the capacitor C14 in series and then is connected with the output end of the operational amplifier U12B; one end of the capacitor C13 is connected with the negative input end of the operational amplifier U12B, and the other end of the capacitor C is connected with the output end of the operational amplifier U12B.
In a further optimized scheme, the detection module includes: the device comprises a voltage acquisition module, a current acquisition module and a temperature acquisition module;
the current acquisition module comprises an overcurrent detection resistor and a current collector, wherein the overcurrent detection resistor is connected in series with the output end of the switching power supply module, one end of the current acquisition module is connected with the overcurrent detection resistor, and the other end of the current acquisition module is connected with the MCU control module;
the temperature acquisition module is used for acquiring the temperatures of the switching power supply module and the digital audio power amplifier.
The further optimization scheme is that the switching power supply module comprises an output voltage V+ end and an output voltage V-end;
the output voltage V+ end and the output voltage V-end are both connected to the digital audio power amplifier, one end of the voltage acquisition module is connected with the output voltage V+ end, and the other end of the voltage acquisition module is connected with the MCU control module; one end of the current acquisition module is connected with the output voltage V-end, and the other end of the current acquisition module is connected with the MCU control module.
The further optimization scheme is that the digital audio power amplifier further comprises a fault detection module, wherein the fault detection module is arranged at the output end of the digital audio power amplifier and is connected with the MCU control module;
the MCU control module also turns off the switching power supply module according to the detection result of the fault detection module.
The further optimization scheme is that the circuit structure of the temperature acquisition module comprises:
the 12V power supply is connected into a first temperature sensor R1, and the first temperature sensor R1 is connected with a current limiting resistor R4 in series and then is connected to the first anode of an isolation diode D2; the 12V power supply is connected to a second temperature sensor R2, and the second temperature sensor R2 is connected with a current limiting resistor R5 in series and then is connected to the second anode of an isolation diode D2; the first temperature sensor R1 is used for detecting the temperature of the output end of the switching power supply module; the second temperature sensor R2 is used for detecting the temperature of the digital audio power amplifier;
the negative electrode of the isolation diode D2 is connected with the resistor R3 in series and then is used as the output end of the temperature detection module to be connected with the MCU control module; the positive electrode of the diode D6 is connected with the output end of the temperature detection module, and the negative electrode of the diode D6 is connected with a +3.3V power supply; one end of the resistor R8 is connected with the output end of the temperature detection module, and the other end of the resistor R is grounded; the capacitor C4 is connected in parallel to both sides of the resistor R8.
The further optimization scheme is that the circuit structure of the fault detection module comprises:
the digital audio power amplifier module outputs to the positive end of the loudspeaker, the negative end of the loudspeaker is grounded, and the positive end of the loudspeaker is connected with the current limiting resistor R14;
the current limiting resistor R14 is connected with the cathode of the voltage stabilizing diode D3, one end of the nonpolar capacitor C5 is connected between the current limiting resistor R14 and the voltage stabilizing diode D3, and the other end of the nonpolar capacitor C5 is grounded;
the positive electrode of the zener diode D3 is connected with the positive electrode of the zener diode D4, and the negative electrode of the zener diode D4 is connected with the positive electrode of the zener diode; the base electrode of the NPN triode Q3 is connected, one end of the divider resistor R15 is connected with the base electrode of the NPN triode Q3, and the other end is connected with the emitter electrode of the NPN triode Q3; the emitter of the NPN triode Q3 is grounded, the emitter of the NPN triode Q1 is connected with the base electrode of the NPN triode Q3, the base electrode of the NPN triode Q1 is grounded, and the collector electrode of the NPN triode Q1 is connected with a resistor R10 and then connected with a power supply V+;
one end of the resistor R11 is connected with the collector of the NPN triode Q1, the other end of the resistor R is connected with the collector of the NPN triode Q3, the base electrode of the PNP triode Q2 is connected with the collector of the NPN triode Q1, and the emitter electrode of the PNP triode Q2 is connected with the power supply V+; the collector of the PNP triode Q2 is connected with the resistor R12 and the resistor R13 in series and then grounded, the capacitor C6 is connected with two sides of the resistor R13 in parallel, the base of the NPN triode Q4 is connected between the resistor R12 and the resistor R13, the collector of the NPN triode Q4 is connected with the MCU control module, and the emitter of the NPN triode Q4 is grounded.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention provides a power supply system of a digital audio power amplifier; based on the existing digital audio power amplifier power supply technology, structural improvement is carried out, the output of the switching power supply module and the digital audio power amplifier is controlled in a rated power range through the detection module and the MCU control module, and when the low-impedance loudspeaker of the digital audio power amplifier causes overlarge current, unmatched power and power supply voltage of the loudspeaker and overhigh temperature, current limiting control is timely carried out, so that the stability of a system is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are needed in the examples will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and that other related drawings may be obtained from these drawings without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is a schematic diagram of a power supply system for an audio power amplifier;
FIG. 2 is a schematic circuit diagram of a constant voltage control module;
FIG. 3 is a schematic circuit diagram of a constant current control module;
FIG. 4 is a schematic circuit diagram of a temperature acquisition module;
FIG. 5 is a schematic circuit diagram of a fault detection module;
FIG. 6 is a schematic circuit diagram of a voltage acquisition module;
fig. 7 is a schematic circuit diagram of a current collection module.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Example 1
The power supply system of the digital audio power amplifier of this embodiment, as shown in fig. 1, includes:
the switch power supply module is used for providing an adjustable power supply for the digital audio power amplifier, the control module and the display module;
the detection module is used for detecting the voltage, the current and the temperature of the output end of the switching power supply module in real time and sending the detected voltage, the detected current and the detected temperature to the MCU control module; the detection module is connected with the output end of the switching power supply module;
and the MCU control module is used for regulating and controlling the output power of the switching power supply module according to the voltage, the current and the temperature and regulating and controlling the output power of the digital audio power amplifier according to the voltage, the current and the temperature.
Further comprises: the device comprises a constant current control module, a constant voltage control module and an LCD display module;
the LCD display module is used for displaying the output power of the digital audio power amplifier and is connected with the MCU control module; the MCU control module regulates and controls the output power of the switching power supply module according to the output power of the LCD display module display digital audio power amplifier;
the MCU control module is connected with the switching power supply module through the constant current control module and regulates and controls the current of the switching power supply module;
the MCU control module is connected with the switching power supply module through the constant voltage control module and regulates and controls the voltage of the switching power supply module.
Further comprises: an isolation diode, a first optocoupler U1 and a second optocoupler U2;
the MCU control module is connected to the switching power supply module through a second optical coupler U2;
the constant current control module and the constant voltage control module are respectively connected with the cathode of an isolation diode, and the anode of the isolation diode is connected with the first optical coupler U1.
The detection module comprises: the device comprises a voltage acquisition module, a current acquisition module and a temperature acquisition module;
the current acquisition module comprises an overcurrent detection resistor and a current collector, wherein the overcurrent detection resistor is connected in series with the output end of the switching power supply module, one end of the current acquisition module is connected with the overcurrent detection resistor, and the other end of the current acquisition module is connected with the MCU control module;
the temperature acquisition module is used for acquiring the temperatures of the switching power supply module and the digital audio power amplifier.
The switching power supply module comprises an output voltage V+ end and an output voltage V-end;
the output voltage V+ end and the output voltage V-end are both connected to the digital audio power amplifier, one end of the voltage acquisition module is connected with the output voltage V+ end, and the other end of the voltage acquisition module is connected with the MCU control module; one end of the current acquisition module is connected with the output voltage V-end, and the other end of the current acquisition module is connected with the MCU control module.
The digital audio power amplifier also comprises a fault detection module, wherein the fault detection module is arranged at the output end of the digital audio power amplifier and is connected with the MCU control module;
the MCU control module also turns off the switching power supply module according to the detection result of the fault detection module.
When the low-impedance loudspeaker of the digital audio power amplifier causes overlarge current, the output voltage V+ end and the output voltage V-end form large current, voltage acquisition is carried out through an overcurrent detection resistor of the output voltage V-and when the temperature detection module detects that the temperature of a certain component is overhigh, the acquired voltage is transmitted to the MCU control module and then fed back to a control circuit of the digital audio power amplifier module, the control circuit limits an input signal, then the output power of the digital audio power amplifier is reduced and then is output to the loudspeaker, when the fault detection module detects that a certain loudspeaker has DC direct current voltage, the MCU controller is transmitted to the MCU controller to close the switching power supply through the U2 photoelectric coupler, the switching power supply stops working, and the system reliability of the loudspeaker and the switching power supply is protected. The voltage acquisition module is used for acquiring voltage and current, the MCU controller is used for transmitting the total power, current, voltage, temperature and faults of data displayed on the LCD controller, the LCD controller is used for setting the output voltage and output current of the switching power supply to the digital audio power amplifier through the constant voltage control module and the constant current control module to provide a power supply system, different loudspeaker power sections are used for providing different output current and voltages, the effect of impedance matching between the digital power amplifier and a loudspeaker is achieved, and the reliability of the amplifier and the switching power rectifying system is guaranteed.
Example 2
Based on the above embodiments, as shown in fig. 2, the circuit structure of the constant voltage control module of the present embodiment is: the positive pole of the isolation diode is connected with a resistor R28, a resistor R29 and a resistor R30 in series, and then is connected with a +12V power supply; the first optocoupler U1 is connected across the resistor R29.
One end of the resistor R22 is connected with the first cathode of the isolation diode, and the other end of the resistor R is connected with the output end of the operational amplifier U12A; the positive electrode input end of the operational amplifier U12A is connected with a resistor R19 in series and then is connected to the MCU control module; one end of the capacitor C11 is connected with the positive electrode input end of the operational amplifier U12A, and the other end of the capacitor C is grounded;
the negative electrode input end of the operational amplifier U12A is connected with the capacitor C9 and the resistor R21 in series and then connected with the output end of the operational amplifier U12, one end of the capacitor C8 is connected with the output end of the operational amplifier U12A, and the other end of the capacitor C8 is connected with the negative electrode input end of the operational amplifier U12A;
the voltage source of 100V-220V is connected with the resistor R28 and the resistor R17 in series and then is connected with the negative input end of the operational amplifier U12A, and a serial branch consisting of the capacitor C12A and the resistor R18 is connected with two sides of the resistor R17 in parallel; one end of the resistor R20 is connected with the negative input end of the operational amplifier U12A, and the other end is grounded.
When the output V+ end (220 Vdc) of the switching power supply is provided for the operational amplifier U12A (2 pins) through the current limiting resistor R28, the resistor R17 and the voltage dividing resistor R20, the obtained reference voltage 2.5V is provided for the operational amplifier U12A (2 pins), an RC network circuit formed by the resistor R18 and the capacitor C12 prevents the starting voltage from overshooting, a compensation network circuit is formed by the resistor R21, the capacitor C9 and the capacitor C8, so that the switching power supply works stably, the dynamic response is good, when the output (0-3.3V) of the V_MCU control module or the output (2.5V) is achieved, the RC filter circuit formed by the capacitor C11 is connected to the operational amplifier U12A (3 pins) through the resistor R19, the output of the operational amplifier U12A (1 pin) pulls down the current limiting resistors R28 and R22, and the potential on the isolation diode D1, the output voltage V+ (220 Vdc) is changed after the working frequency of the LLC_FB is changed, and the switching power supply can be completed according to the actual voltage V+ requirement.
Example 3
Based on the above embodiments, as shown in fig. 3, the circuit structure of the constant current control module of the present embodiment includes:
one end of the resistor R27 is connected with the second cathode of the isolation diode, the other end of the resistor R27 is connected with the output end of the operational amplifier U12B, the positive input end of the operational amplifier U12B is connected with the MCU control module in series with the resistor R24, and the negative input end of the operational amplifier U12B is connected with the current acquisition module in series with the resistor R23; one end of the capacitor C15 is connected with the positive electrode input end of the operational amplifier U12B, and the other end of the capacitor C is grounded;
the negative input end of the operational amplifier U12B is connected with the resistor R23 and the capacitor C14 in series and then is connected with the output end of the operational amplifier U12B; one end of the capacitor C13 is connected with the negative input end of the operational amplifier U12B, and the other end of the capacitor C is connected with the output end of the operational amplifier U12B.
When the output V-end of the switching power supply passes through the current detection resistor S1, the current acquisition module S4 takes out a current signal, the obtained reference voltage 725mV is provided for the operational amplifier U12A (6 feet) through the current limiting resistor R23, the resistor R26, the capacitor C14 and the capacitor C13 form a compensation network circuit, so that the switching power supply works stably, the dynamic response is good, when the output of the I_MCU control module is 0-1000mV or is greater than 725mV, the current signal is transmitted to the operational amplifier U12A (5 feet) through the RC filter circuit formed by the resistor R24 and the capacitor C15, the current limiting resistors R27 and R28 are output by the operational amplifier U12A (7 feet), after the potential on the isolation diode D1 is pulled down, the photoelectric coupler U1 is conducted to work in a linear state, the output current is changed after the working frequency of the LLC_FB is changed, and the switching power supply can be completed according to the actual current requirements.
Example 4
Based on the above embodiments, as shown in fig. 4, the circuit structure of the temperature acquisition module of the present embodiment includes:
the 12V power supply is connected into a first temperature sensor R1, and the first temperature sensor R1 is connected with a current limiting resistor R4 in series and then is connected to the first anode of an isolation diode D2; the 12V power supply is connected to a second temperature sensor R2, and the second temperature sensor R2 is connected with a current limiting resistor R5 in series and then is connected to the second anode of an isolation diode D2; the first temperature sensor R1 is used for detecting the temperature of the output end of the switching power supply module; the second temperature sensor R2 is used for detecting the temperature of the digital audio power amplifier;
the negative electrode of the isolation diode D2 is connected with the resistor R3 in series and then is used as the output end of the temperature detection module to be connected with the MCU control module; the positive electrode of the diode D6 is connected with the output end of the temperature detection module, and the negative electrode of the diode D6 is connected with a +3.3V power supply; one end of the resistor R8 is connected with the output end of the temperature detection module, and the other end of the resistor R is grounded; the capacitor C4 is connected in parallel to both sides of the resistor R8.
When the temperature of a certain component in the digital audio power amplifier or the switching power supply module is too high, the first temperature sensor R1, the resistance value of the first temperature sensor R2 based on the highest temperature detection is divided by the current limiting resistor R5, the resistor R4, the voltage dividing resistor R7, the resistor R9 and the filter capacitor C3, and the voltage obtained by the capacitor C1 is sent to the positive electrode of the isolation diode D2 (1 and 2 pins), and the voltage output by the negative electrode of the isolation diode D2 (3 pins) is sent to the MCU control module within the range of 0.1-3V of the acquired voltage obtained by the current limiting resistor R3, the voltage dividing resistor R8 and the filter capacitor C4 through the voltage dividing resistor R6 and the filter capacitor C2. The protection diode D6 is a pin for preventing the MCU control from being damaged by the excessive voltage; the first temperature sensor R1 and the second temperature sensor R2 have resistance values based on the highest temperature detection.
Example 5
Based on the above embodiments, as shown in fig. 5, the circuit structure of the fault detection module of the present embodiment includes:
the digital audio power amplifier module outputs to the positive end of the loudspeaker, the negative end of the loudspeaker is grounded, and the positive end of the loudspeaker is connected with the current limiting resistor R14;
the current limiting resistor R14 is connected with the cathode of the voltage stabilizing diode D3, one end of the nonpolar capacitor C5 is connected between the current limiting resistor R14 and the voltage stabilizing diode D3, and the other end of the nonpolar capacitor C5 is grounded;
the positive electrode of the zener diode D3 is connected with the positive electrode of the zener diode D4, and the negative electrode of the zener diode D4 is connected with the positive electrode of the zener diode; the base electrode of the NPN triode Q3 is connected, one end of the divider resistor R15 is connected with the base electrode of the NPN triode Q3, and the other end is connected with the emitter electrode of the NPN triode Q3; the emitter of the NPN triode Q3 is grounded, the emitter of the NPN triode Q1 is connected with the base electrode of the NPN triode Q3, the base electrode of the NPN triode Q1 is grounded, and the collector of the NPN triode Q1 is connected with the offset resistor R10 and then connected with the power supply V+;
one end of the resistor R11 is connected with the collector of the NPN triode Q1, the other end of the resistor R is connected with the collector of the NPN triode Q3, the base electrode of the PNP triode Q2 is connected with the collector of the NPN triode Q1, and the emitter electrode of the PNP triode Q2 is connected with the power supply V+; the collector of the PNP triode Q2 is connected with the resistor R12 and the resistor R13 in series and then grounded, the capacitor C6 is connected with two sides of the resistor R13 in parallel, the base of the NPN triode Q4 is connected between the resistor R12 and the resistor R13, the collector of the NPN triode Q4 is connected with the MCU control module, and the emitter of the NPN triode Q4 is grounded.
When the digital audio power amplifier module outputs a positive and negative direct voltage (+/-DC) to the positive end of the loudspeaker, the positive end of the loudspeaker is filtered by the current limiting resistor R14 and the nonpolar capacitor C5.
When the digital audio power amplifier outputs direct-current voltage (V+) and then is subjected to voltage reduction through a voltage stabilizing diode D3, the voltage is conducted to a voltage dividing resistor R15 and added to the B pole of an NPN triode Q3, the CE pole of the NPN triode Q3 is conducted and grounded, the B pole of a PNP triode Q2 is conducted and grounded through a current limiting resistor R11, a bias voltage is provided for the PNP triode Q2 by a bias resistor R10, the CE pole of the PNP triode Q2 is conducted to generate voltage V+ to be divided by a resistor R12 and a resistor R13, a filter capacitor C6 is conducted to the B pole of the NPN triode Q4, and a low level is generated by conducting the triode Q4 to the MCU control module.
When the power amplifier outputs direct current voltage (V-), the direct current voltage is conducted through a voltage stabilizing diode D3, then the direct current voltage is reduced to a voltage dividing resistor R15 and added to the E pole of an NPN triode Q1, the E pole of the NPN triode Q1 is lower than the B pole of the NPN triode Q1, the CE pole of the NPN triode Q1 is conducted, a bias resistor R10 provides a bias voltage for a PNP triode Q2, the B pole of the PNP triode Q2 is changed into a low level, the CE pole of the PNP triode Q2 is conducted to generate voltage V+ to be divided by a current limiting resistor R12 and a resistor R13, a filter capacitor C6 is conducted to the B pole of the NPN triode Q4, and the triode Q4 is conducted to generate a low level to the MCU control module. The nonpolar capacitor C5 performs a filtering function for outputting positive and negative voltages.
Example 6
Based on the above embodiments, as shown in fig. 6, the circuit structure of the voltage acquisition module of the present embodiment includes: the output V+ of the switching power supply passes through a current limiting resistor R31, the other end of the current limiting resistor R31 is connected with a voltage dividing resistor, a filter capacitor C16, a protection diode D6 and a V+DC_MCU control module, the protection diode D6 is connected with +3.3V, and the voltage dividing resistor R32 and the filter capacitor C16 are connected with V-GND. Specific control principle: the output V+ of the switching power supply is limited by a resistor R31, the resistor R32 is divided and the capacitor of C16 is filtered, and then a voltage is taken out for the MCU control module to collect, so that the protection diode D6 is used for preventing the MCU serial port from being damaged due to overhigh voltage.
As shown in fig. 7, the circuit structure of the current collection module includes: the output V+ of the switching power supply is connected with the positive electrode of a filter capacitor C1, V-is connected with an overcurrent detection resistor R1 and a current acquisition module U1 (1 pin), the other end of the overcurrent detection resistor R1 is connected with a V-GDN, the negative electrode of the filter capacitor C2 and a current acquisition module U1 (2 pin), the other end of the filter capacitor C1 is connected with GND, the current acquisition module U1 (7 pin) is connected with a current limiting resistor R2 and a resistor R3, the other end of the current limiting resistor R2 is connected with an IOUT_sampling resistor, the other end of the current limiting resistor R3 is connected with an MCU_control module, the current acquisition module U1 (4 pin), (5 pin) is connected with V-GND, and the current acquisition module U1 (8 pin) is connected with +12V.
Specific control principle: the output of the switching power supply is obtained from two ends of the V-series overcurrent detection resistor R1, current signals are sent to the input end of the current acquisition module U1 for amplification, the amplified current signals are output from the (7-pin) output to be divided into two groups, one group is sent to the input end of the IOUT_constant current control module for constant current control, and the other group is sent to the MCU_control module for acquisition.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A power supply system for a digital audio power amplifier, comprising:
the switching power supply module is used for providing an adjustable power supply for the digital audio power amplifier and the MCU control module;
the detection module is used for detecting the voltage, the current and the temperature of the output end of the switching power supply module in real time and sending the detected voltage, the detected current and the detected temperature to the MCU control module; the detection module is connected with the output end of the switching power supply module;
and the MCU control module is used for regulating and controlling the output power of the switching power supply module according to the voltage, the current and the temperature and regulating and controlling the output power of the digital audio power amplifier according to the voltage, the current and the temperature.
2. The power supply system of a digital audio power amplifier of claim 1, further comprising: the device comprises a constant current control module, a constant voltage control module and an LCD display module;
the LCD display module is used for displaying the output power of the digital audio power amplifier and is connected with the MCU control module; the MCU control module regulates and controls the output power of the switching power supply module according to the output power of the LCD display module display digital audio power amplifier;
the MCU control module is connected with the switching power supply module through the constant current control module and regulates and controls the current of the switching power supply module;
the MCU control module is connected with the switching power supply module through the constant voltage control module and regulates and controls the voltage of the switching power supply module.
3. The power supply system of a digital audio power amplifier of claim 2, further comprising: an isolation diode, a first optocoupler U1 and a second optocoupler U2;
the MCU control module is connected to the switching power supply module through a second optical coupler U2;
the constant current control module and the constant voltage control module are respectively connected with the cathode of an isolation diode, and the anode of the isolation diode is connected with the first optical coupler U1.
4. A power supply system for a digital audio power amplifier according to claim 3, wherein the circuit structure of the constant voltage control module is: positive connection of isolation diode
One end of the resistor R22 is connected with the first cathode of the isolation diode, and the other end of the resistor R is connected with the output end of the operational amplifier U12A; the positive electrode input end of the operational amplifier U12A is connected with a resistor R19 in series and then is connected to the MCU control module; one end of the capacitor C11 is connected with the positive electrode input end of the operational amplifier U12A, and the other end of the capacitor C is grounded;
the negative electrode input end of the operational amplifier U12A is connected with the capacitor C9 and the resistor R21 in series and then connected with the output end of the operational amplifier U12, one end of the capacitor C8 is connected with the output end of the operational amplifier U12A, and the other end of the capacitor C8 is connected with the negative electrode input end of the operational amplifier U12A;
the voltage source of 100V-220V is connected with the resistor R28 and the resistor R17 in series and then is connected with the negative input end of the operational amplifier U12A, and a serial branch consisting of the capacitor C12A and the resistor R18 is connected with two sides of the resistor R17 in parallel; one end of the resistor R20 is connected with the negative input end of the operational amplifier U12A, and the other end is grounded.
5. A power supply system for a digital audio power amplifier according to claim 3, wherein the circuit structure of the constant current control module is:
one end of the resistor R27 is connected with the second cathode of the isolation diode, the other end of the resistor R27 is connected with the output end of the operational amplifier U12B, the positive input end of the operational amplifier U12B is connected with the MCU control module in series with the resistor R24, and the negative input end of the operational amplifier U12B is connected with the current acquisition module in series with the resistor R23; one end of the capacitor C15 is connected with the positive electrode input end of the operational amplifier U12B, and the other end of the capacitor C is grounded;
the negative input end of the operational amplifier U12B is connected with the resistor R23 and the capacitor C14 in series and then is connected with the output end of the operational amplifier U12B; one end of the capacitor C13 is connected with the negative input end of the operational amplifier U12B, and the other end of the capacitor C is connected with the output end of the operational amplifier U12B.
6. The power supply system of a digital audio power amplifier of claim 1, wherein the detection module comprises: the device comprises a voltage acquisition module, a current acquisition module and a temperature acquisition module;
the current acquisition module comprises an overcurrent detection resistor and a current collector, wherein the overcurrent detection resistor is connected in series with the output end of the switching power supply module, one end of the current acquisition module is connected with the overcurrent detection resistor, and the other end of the current acquisition module is connected with the MCU control module;
the temperature acquisition module is used for acquiring the temperatures of the switching power supply module and the digital audio power amplifier.
7. A power supply system for a digital audio power amplifier according to claim 3, wherein the switching power supply module comprises an output voltage v+ terminal and an output voltage V-terminal;
the output voltage V+ end and the output voltage V-end are both connected to the digital audio power amplifier, one end of the voltage acquisition module is connected with the output voltage V+ end, and the other end of the voltage acquisition module is connected with the MCU control module; one end of the current acquisition module is connected with the output voltage V-end, and the other end of the current acquisition module is connected with the MCU control module.
8. The power supply system of the digital audio power amplifier according to claim 1, further comprising a fault detection module, wherein the fault detection module is arranged at an output end of the digital audio power amplifier, and the fault detection module is connected with the MCU control module;
the MCU control module also turns off the switching power supply module according to the detection result of the fault detection module.
9. The power supply system of a digital audio power amplifier of claim 6, wherein the circuit structure of the temperature acquisition module comprises:
the 12V power supply is connected into a first temperature sensor R1, and the first temperature sensor R1 is connected with a current limiting resistor R4 in series and then is connected to the first anode of an isolation diode D2; the 12V power supply is connected to a second temperature sensor R2, and the second temperature sensor R2 is connected with a current limiting resistor R5 in series and then is connected to the second anode of an isolation diode D2; the first temperature sensor R1 is used for detecting the temperature of the output end of the switching power supply module; the second temperature sensor R2 is used for detecting the temperature of the digital audio power amplifier;
the negative electrode of the isolation diode D2 is connected with the resistor R3 in series and then is used as the output end of the temperature detection module to be connected with the MCU control module; the positive electrode of the diode D6 is connected with the output end of the temperature detection module, and the negative electrode of the diode D6 is connected with a +3.3V power supply; one end of the resistor R8 is connected with the output end of the temperature detection module, and the other end of the resistor R is grounded; the capacitor C4 is connected in parallel to both sides of the resistor R8.
10. The power supply system of a digital audio power amplifier of claim 8, wherein the circuit structure of the fault detection module comprises:
the digital audio power amplifier module outputs to the positive end of the loudspeaker, the negative end of the loudspeaker is grounded, and the positive end of the loudspeaker is connected with the current limiting resistor R14;
the current limiting resistor R14 is connected with the cathode of the voltage stabilizing diode D3, one end of the nonpolar capacitor C5 is connected between the current limiting resistor R14 and the voltage stabilizing diode D3, and the other end of the nonpolar capacitor C5 is grounded;
the positive electrode of the zener diode D3 is connected with the positive electrode of the zener diode D4, and the negative electrode of the zener diode D4 is connected with the positive electrode of the zener diode; the base electrode of the NPN triode Q3 is connected, one end of the divider resistor R15 is connected with the base electrode of the NPN triode Q3, and the other end is connected with the emitter electrode of the NPN triode Q3; the emitter of the NPN triode Q3 is grounded, the emitter of the NPN triode Q1 is connected with the base electrode of the NPN triode Q3, the base electrode of the NPN triode Q1 is grounded, and the collector electrode of the NPN triode Q1 is connected with a resistor R10 and then connected with a power supply V+;
one end of the resistor R11 is connected with the collector of the NPN triode Q1, the other end of the resistor R is connected with the collector of the NPN triode Q3, the base electrode of the PNP triode Q2 is connected with the collector of the NPN triode Q1, and the emitter electrode of the PNP triode Q2 is connected with the power supply V+; the collector of the PNP triode Q2 is connected with the resistor R12 and the resistor R13 in series and then grounded, the capacitor C6 is connected with two sides of the resistor R13 in parallel, the base of the NPN triode Q4 is connected between the resistor R12 and the resistor R13, the collector of the NPN triode Q4 is connected with the MCU control module, and the emitter of the NPN triode Q4 is grounded.
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| CN102281013A (en) * | 2011-08-25 | 2011-12-14 | 华南理工大学 | Multi-module parallel power supply device and cooperative control method thereof |
| CN202406025U (en) * | 2011-12-09 | 2012-08-29 | 佛山市南庄广昌电器塑料有限公司 | Adjustable constant-current and temperature control soft protection switch power supply circuit |
| CN108683075A (en) * | 2018-04-24 | 2018-10-19 | 杭州科雷机电工业有限公司 | A kind of high current high frequency modulated laser Constant-power drive circuit and control method |
| CN208227289U (en) * | 2018-05-04 | 2018-12-11 | 珠海惠威科技有限公司 | A kind of power control device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102281013A (en) * | 2011-08-25 | 2011-12-14 | 华南理工大学 | Multi-module parallel power supply device and cooperative control method thereof |
| CN202406025U (en) * | 2011-12-09 | 2012-08-29 | 佛山市南庄广昌电器塑料有限公司 | Adjustable constant-current and temperature control soft protection switch power supply circuit |
| CN108683075A (en) * | 2018-04-24 | 2018-10-19 | 杭州科雷机电工业有限公司 | A kind of high current high frequency modulated laser Constant-power drive circuit and control method |
| CN208227289U (en) * | 2018-05-04 | 2018-12-11 | 珠海惠威科技有限公司 | A kind of power control device |
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