CN209982328U - Multiphase boosting power supply circuit of audio power amplifier - Google Patents
Multiphase boosting power supply circuit of audio power amplifier Download PDFInfo
- Publication number
- CN209982328U CN209982328U CN201920849852.6U CN201920849852U CN209982328U CN 209982328 U CN209982328 U CN 209982328U CN 201920849852 U CN201920849852 U CN 201920849852U CN 209982328 U CN209982328 U CN 209982328U
- Authority
- CN
- China
- Prior art keywords
- power supply
- unit
- resistor
- pwm signal
- generation control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Amplifiers (AREA)
- Dc-Dc Converters (AREA)
Abstract
The utility model discloses an audio power amplifier's heterogeneous boost power supply circuit, include: the PWM signal generation control unit is used for outputting at least two groups of PWM signals with the same frequency and equal phase division of 360 degrees; the PWM signal driving units are matched with the PWM signals in number and are respectively connected with the PWM signal generation control unit; the power supply boosting units are matched with the PWM signals in quantity, the control end of each power supply boosting unit is connected with one PWM signal driving unit, the input end of each power supply boosting unit is used for receiving external power supply signals, and the output end of each power supply boosting unit is connected together for confluence output. The power supply signal is evenly distributed to at least two power supply boosting units for amplification and confluence output, so that a multi-phase boosting power supply is formed.
Description
Technical Field
The utility model relates to a car audio power amplifier's power field, concretely relates to audio power amplifier's heterogeneous boost power supply circuit.
Background
At present, the power supply of the audio power amplifier of the common automobile comes from a vehicle-mounted generator or a storage battery. Because the storage battery of the common automobile is rated at 12V, the output power of the audio power amplifier directly powered by the storage battery can only achieve smaller output of 30Wrms @ 10% THD; the high-power automobile audio power amplifier on the market generally adopts a push-pull type switch boosting power supply, but the high-power push-pull type switch power supply has the characteristics of large size of a switch transformer, complex winding, lower switching frequency and the like, so that the efficiency, the size and the output ripple factor of the general automobile audio power amplifier are not ideal.
Disclosure of Invention
Not enough to prior art, the utility model provides an audio power amplifier's heterogeneous boost power supply circuit for solve the problem of the not ideal enough of efficiency of car audio power amplifier power.
The content of the utility model is as follows:
a multi-phase boost power supply circuit for an audio power amplifier, comprising:
the PWM signal generation control unit is used for outputting at least two groups of PWM signals with the same frequency and equal phase division of 360 degrees;
the number of the PWM signal driving units is matched with that of the PWM signals, the PWM signal driving units are respectively connected with the PWM signal generation control unit, and each PWM signal driving unit is used for receiving a group of PWM signals and amplifying and outputting the PWM signals;
the power boost unit, quantity with PWM signal phase-match, and every the control end of power boost unit with one PWM signal drive unit connects, every the input of power boost unit is used for receiving outside power signal, every the output of power boost unit links together and carries out the output of converging.
Preferably, each power supply boosting unit comprises a switch tube, an inductor and a diode, a control end of the switch tube is connected with the PWM signal driving unit, a high-voltage end of the switch tube is connected with one end of the inductor, a low-voltage end of the switch tube is grounded, the other end of the inductor is used for receiving an external power supply signal, the high-voltage end of the switch tube is further connected with an anode of the diode, a cathode of the diode is grounded through a filter circuit, and the diode is used for outputting a rectification signal.
Preferably, a current sampling unit is further connected between the low-voltage end of the switching tube and the ground end, and an output end of the current sampling unit is connected with a current sampling end of the PWM signal generation control unit.
Preferably, the current sampling unit includes a first resistor, a second resistor and a first capacitor, a first end of the first resistor is grounded, a second end of the first resistor is connected to the low-voltage end of the switching tube, a first end of the second resistor is connected to the low-voltage end of the switching tube, a second end of the second resistor is connected to the current sampling end of the PWM signal generation control unit, and a second end of the second resistor is grounded through the first capacitor.
Preferably, the output end of each power supply boosting unit is further connected with a voltage sampling unit, and the output end of the voltage sampling unit is connected with the feedback end of the PWM signal generation control unit.
Preferably, the voltage sampling unit includes third to fifth resistors and a second capacitor, a first end of the third resistor and a first end of the fourth resistor are connected in parallel and then connected to an output terminal of each power supply boosting unit, a second end of the third resistor is connected to the first end of the fifth resistor through the second capacitor, a second end of the fifth resistor is grounded, the second end of the fifth resistor is further connected to the feedback terminal of the PWM signal generation control unit, and the second end of the fourth resistor is connected to the first end of the fifth resistor.
Preferably, the PWM signal generation control unit includes a chip with model number TPS 40090.
Preferably, the PWM signal driving unit includes a chip of model EG 27324.
The utility model has the advantages that: the utility model discloses with power signal average assignment two at least power boost units enlarge and converge the output to form heterogeneous power that steps up, compare with traditional single phase power, when output is the same, output current is by average assignment every phase power that steps up, can reduce the total power consumption of circuit, thereby promotes the efficiency of car audio power amplifier power.
Drawings
Fig. 1 is a schematic circuit block diagram 1 according to an embodiment of the present invention;
fig. 2 is a schematic block diagram 1 of a power supply boosting unit according to an embodiment of the present invention;
fig. 3 is a schematic block diagram 2 of a power supply boosting unit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a current sampling unit according to an embodiment of the present invention;
fig. 5 is a schematic block circuit diagram 2 according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a voltage sampling unit according to an embodiment of the present invention;
fig. 7 is a schematic circuit diagram according to an embodiment of the present invention.
Detailed Description
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Referring to fig. 1, the multi-phase boost power supply circuit of an audio power amplifier disclosed in this embodiment includes a power signal input unit 4, an output unit 5, a PWM signal generation control unit 1, a PWM signal driving unit 2, and a power boost unit 3, where the power signal input unit 4 is connected to the PWM signal generation control unit 1, the PWM signal driving unit 2, and the power boost unit 3 is connected to the output unit 5.
The PWM signal generation control unit 1 is configured to output at least two sets of PWM signals having the same frequency and equal phases of 360 °, for example, when two sets of PWM signals are output, the phases of the PWM signals are 180 °, and when three sets of PWM signals are output, the phases of the PWM signals are 120 °.
The number of the PWM signal driving units 2 is matched with the number of the PWM signals and is respectively connected with the PWM signal generation control unit 1, and each PWM signal driving unit 2 is used for receiving a group of PWM signals and amplifying and outputting the PWM signals.
The number of the power supply boosting units 3 is matched with the PWM signals, the control end of each power supply boosting unit 3 is connected with one PWM signal driving unit 2, the input end of each power supply boosting unit 3 is used for receiving external power supply signals, the output end of each power supply boosting unit 3 is connected together for confluence output, and the power supply boosting units 3 are controlled by the PWM signals and used for boosting and outputting the power supply signals.
Referring to fig. 2, the power BOOST units 3 are BOOST type power BOOST circuits, each power BOOST unit 3 includes a switch 31, an inductor 32 and a diode 33, the switch 31 of this embodiment is preferably a MOS transistor, the control terminal of the switch 31 is connected to the PWM signal driving unit 2, the high-voltage terminal of the switch 31 is connected to one terminal of the inductor 32, the low-voltage terminal of the switch 31 is grounded, the other terminal of the inductor 32 is used for receiving an external power signal, the high-voltage terminal of the switch 31 is further connected to the anode of the diode 33, the cathode of the diode 33 is grounded through a filter circuit 34, the diode 33 is used for outputting a rectified signal, the PWM signal driving unit 2 drives the switch 31 to be turned on and off, and the inductor 32 performs energy storage and electric energy release operations, the output voltage of the power BOOST unit 3 is higher than the power voltage by the connection method of the power source and the inductor 32 in series connection, i.e. performs BOOST conversion, the signals after the boost conversion can reduce ripples through rectification and filtering.
Referring to fig. 3, in order to control the output maximum output current, a current sampling unit 35 is further connected between the low voltage terminal of the switching tube 31 and the ground terminal, and the output terminal of the current sampling unit 35 is connected to the current sampling terminal of the PWM signal generation control unit 1. The PWM signal generation control unit 1 collects the sampling signal from each current sampling unit 35, and adjusts the duty ratio of each group of PWM signals according to the sampling signal, thereby achieving the purpose of average current output of each phase circuit. If the sampling current exceeds the preset maximum output current value, the PWM signal generation control unit 1 enters a protection mode until the output current drops to a normal level and then is released.
Referring to fig. 4, the current sampling unit 35 includes a first resistor 351, a second resistor 352 and a first capacitor 353, a first end of the first resistor 351 is grounded, a second end of the first resistor 351 is connected to the low-voltage end of the switch tube 31, a first end of the second resistor 352 is connected to the low-voltage end of the switch tube 31, a second end of the second resistor 352 is connected to the current sampling end of the PWM signal generation control unit 1, and a second end of the second resistor 352 is also grounded through the first capacitor 353. The first resistor 351 and the second resistor 352 are current sampling resistors for converting the current signal into a voltage signal and sending the voltage signal to the PWM signal generation control unit 1.
Referring to fig. 5, in order to stabilize the output voltage, the output end of each power supply boosting unit 3 is further connected to a voltage sampling unit 6, the output end of the voltage sampling unit 6 is connected to the feedback end of the PWM signal generation control unit 1, and the PWM signal generation control unit 1 adjusts the duty ratio of each PWM signal according to the signal of the voltage sampling unit 6 to adjust the switching time of the switching tube 31, so that the output voltage is controlled within a required voltage value range.
Referring to fig. 6, the voltage sampling unit 6 includes third to fifth resistors R8 and a second capacitor C15, a first end of the third resistor R10 and a first end of the fourth resistor R9 are connected in parallel and then respectively connected to the output end of each power boosting unit 3, a second end of the third resistor R10 is connected to a first end of the fifth resistor R8 through the second capacitor C15, a second end of the fifth resistor R8 is grounded, a second end of the fifth resistor R8 is further connected to the feedback end of the PWM signal generation control unit 1, and a second end of the fourth resistor R9 is connected to a first end of the fifth resistor R8.
Referring to fig. 7, the PWM signal generation control unit 1 of the present embodiment includes a chip U1 manufactured by TI corporation and having a model number of TPS40090 and its peripheral circuits, the TPS40090 chip has a maximum of 4 sets of PWM control signals output and adjustable output frequency, voltage and protection current, and the PWM signal generation control unit 1 generates 4 sets of square wave signals having a frequency of 500KHz and a phase difference of 90 °, and sends the square wave signals to the PWM signal driving unit 2 for amplification. The pin PWM1, the pin PWM2, the pin PWM3 and the pin PWM4 of the chip U1 are signal output terminals of the PWM signal generation control unit 1, the pin CS1, the pin CS2, the pin CS3 and the pin CS4 of the chip U1 are current sampling terminals of the PWM signal generation control unit 1, and the pin FB of the chip U1 is a feedback terminal of the PWM signal generation control unit 1.
The PWM signal driving unit 2 comprises a chip with the model of EG27324, and as the chip of EG27324 is a double-group driving chip, the embodiment adopts two EG27324 chips (U2 and U3) which respectively correspond to 4 groups of wave signals, and the EG27324 chip has the characteristics of wide power supply voltage, small static power consumption, strong output carrying capacity, short input and output delay and high cost performance. The amplified square wave signal drives the power supply boosting unit 3 to perform boosting conversion, and the boosted and converted signal is subjected to rectification filtering and then is converged and output.
In the present embodiment, a multi-phase power supply is composed of the PWM signal generation control unit 1, the PWM signal driving unit 2, and the power supply boosting unit 3, and compared with a single-phase power supply, when the output power is the same, the output current is equally distributed to each phase of boosting power supply, according to the relation formula between the consumed power and the load current: p ═ I2Consumed power of R, 4-phase power supply
Therefore, the total power consumption of the 4-phase power supply is only 1/4 of the common single-phase power supply, so that the total power consumption of the circuit can be reduced, and the efficiency of the power supply of the automobile audio power amplifier is improved. Because of the multi-phase power supply, the current flowing through each phase of power supply is reduced, so that the inductor 32 with smaller magnetic core size and smaller diameter of the enameled copper wire can be selected, and the size of the product is reduced. In addition, thanks to the phase difference between the phases of the multi-phase power supply, the rectified dc signal has a much lower ripple after being converged than that of a general single-phase power supply, i.e., the output ripple coefficient of the present embodiment is smaller under the same filtering condition.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and the technical effects of the present invention can be achieved by the same means, which all belong to the protection scope of the present invention. The technical solution and/or the embodiments of the invention may be subject to various modifications and variations within the scope of the invention.
Claims (8)
1. A multi-phase boost power supply circuit for an audio power amplifier, comprising:
the PWM signal generation control unit (1) is used for outputting at least two groups of PWM signals with the same frequency and equal phase division of 360 degrees;
the number of the PWM signal driving units (2) is matched with that of the PWM signals, the PWM signal driving units are respectively connected with the PWM signal generation control unit (1), and each PWM signal driving unit (2) is used for receiving a group of PWM signals and amplifying and outputting the PWM signals;
power boost unit (3), quantity with PWM signal phase-match, and every the control end of power boost unit (3) with one PWM signal drive unit (2) are connected, every the input of power boost unit (3) is used for receiving outside power signal, every the output of power boost unit (3) links together and converges and export.
2. The multi-phase boost power supply circuit for an audio power amplifier of claim 1, wherein: every power boost unit (3) include switch tube (31), inductance and diode, the control end of switch tube (31) with PWM signal drive unit (2) are connected, and the high-voltage terminal of switch tube (31) is connected with the one end of inductance, and the low-voltage terminal ground connection of switch tube (31), the other end of inductance are used for receiving outside power signal, and the high-voltage terminal of switch tube (31) still is connected with the positive pole of diode, and the negative pole of diode passes through filter circuit (34) ground connection, and the diode is used for exporting the rectification signal.
3. The multi-phase boost power supply circuit for an audio power amplifier of claim 2, wherein: and a current sampling unit (35) is further connected between the low-voltage end of the switch tube (31) and the grounding end, and the output end of the current sampling unit (35) is connected with the current sampling end of the PWM signal generation control unit (1).
4. The multi-phase boost power supply circuit for an audio power amplifier of claim 3, wherein: the current sampling unit (35) comprises a first resistor (351), a second resistor (352) and a first capacitor (353), wherein the first end of the first resistor (351) is grounded, the second end of the first resistor (351) is connected with the low-voltage end of the switch tube (31), the first end of the second resistor (352) is connected with the low-voltage end of the switch tube (31), the second end of the second resistor (352) is connected with the current sampling end of the PWM signal generation control unit (1), and the second end of the second resistor (352) is grounded through the first capacitor (353).
5. The multi-phase boost power supply circuit of an audio power amplifier according to claim 1 or 4, characterized in that: the output end of each power supply boosting unit (3) is also connected with a voltage sampling unit (6), and the output end of the voltage sampling unit (6) is connected with the feedback end of the PWM signal generation control unit (1).
6. The multi-phase boost power supply circuit for an audio power amplifier of claim 5, wherein: the voltage sampling unit (6) comprises third to fifth resistors R8 and a second capacitor C15, a first end of the third resistor R10 and a first end of the fourth resistor R9 are connected in parallel and then are respectively connected with an output end of each power supply boosting unit (3), a second end of the third resistor R10 is connected with a first end of a fifth resistor R8 through a second capacitor C15, a second end of the fifth resistor R8 is grounded, a second end of the fifth resistor R8 is also connected with a feedback end of the PWM signal generation control unit (1), and a second end of the fourth resistor R9 is connected with a first end of the fifth resistor R8.
7. The multi-phase boost power supply circuit for an audio power amplifier of claim 1, wherein: the PWM signal generation control unit (1) comprises a chip with the model number of TPS 40090.
8. The multi-phase boost power supply circuit for an audio power amplifier of claim 1, wherein: the PWM signal driving unit (2) comprises a chip with the model number EG 27324.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920849852.6U CN209982328U (en) | 2019-06-06 | 2019-06-06 | Multiphase boosting power supply circuit of audio power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920849852.6U CN209982328U (en) | 2019-06-06 | 2019-06-06 | Multiphase boosting power supply circuit of audio power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209982328U true CN209982328U (en) | 2020-01-21 |
Family
ID=69265594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920849852.6U Active CN209982328U (en) | 2019-06-06 | 2019-06-06 | Multiphase boosting power supply circuit of audio power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209982328U (en) |
-
2019
- 2019-06-06 CN CN201920849852.6U patent/CN209982328U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8058747B2 (en) | Systems to connect multiple direct current energy sources to an alternating current system | |
| CN201985759U (en) | DCDC (direct current direct current) output circuit | |
| CN107925343A (en) | The Hysteresis control of power supply changeover device based on transformer | |
| CN109756115A (en) | A kind of boost power translation circuit, method, inverter, apparatus and system | |
| CN101295936B (en) | Exterior feeding control power supply of high voltage frequency convertor power unit | |
| CN105939107B (en) | A kind of quasi- boost switching DC-DC converter of mixed type | |
| CN108400709A (en) | A kind of two-way DC/DC converters of integrated three level of bipolarity of crisscross parallel magnetic | |
| CN105226946A (en) | A kind of overvoltage/undervoltage surge control circuit | |
| CN110504836A (en) | Buck converter based on STC circuit Yu resonance Buck circuit | |
| US20190372382A1 (en) | Dc charging system for storage battery of electric vehicle | |
| CN201860261U (en) | Boost circuit | |
| CN211701859U (en) | Negative voltage input and negative voltage output switch type voltage reduction conversion circuit | |
| CN108054939B (en) | High power density three-phase PFC power module | |
| CN112350583B (en) | Current type push-pull bridge type soft switch bidirectional direct current converter | |
| JPH1198685A (en) | Game machine power supply circuit | |
| Hirachi et al. | Cost-effective bidirectional chopper-based battery link UPS with common input-output bus line and its control scheme | |
| CN209982328U (en) | Multiphase boosting power supply circuit of audio power amplifier | |
| CN217278843U (en) | Power supply energy recovery system | |
| CN201438672U (en) | DC-DC direct current power circuit | |
| CN214045191U (en) | Wireless charging circuit, system and electronic equipment | |
| CN205430061U (en) | Keep apart power adapter system with power factor correction function | |
| CN107154735A (en) | A kind of special DC DC12V10A converters of electric car | |
| CN213027830U (en) | 2000W high-frequency inverter | |
| CN209805675U (en) | Logic voltage conversion circuit applied to T-CON board | |
| CN2819617Y (en) | DC booster power-supply circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |