CN219181414U - Audio switching power supply - Google Patents
Audio switching power supply Download PDFInfo
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- CN219181414U CN219181414U CN202223217073.5U CN202223217073U CN219181414U CN 219181414 U CN219181414 U CN 219181414U CN 202223217073 U CN202223217073 U CN 202223217073U CN 219181414 U CN219181414 U CN 219181414U
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The utility model discloses an audio switching power supply, and relates to the technical field of switching power supplies. The circuit comprises a power input interface, a two-stage low-pass filter network, a first rectifying filter circuit, a power switch circuit, a second rectifying filter circuit and a voltage feedback circuit; the input end of the second-stage low-pass filter network is electrically connected with the power input interface, the output end of the second-stage low-pass filter network is electrically connected with the input end of the first rectifying and filtering circuit, the output end of the first rectifying and filtering circuit is electrically connected with the input end of the power switch circuit, the output end of the power switch circuit is electrically connected with the input end of the second rectifying and filtering circuit, and the output end of the second rectifying and filtering circuit is used for being connected with a load; the input end of the voltage feedback circuit is electrically connected with the output end of the second rectifying and filtering circuit, and the output end of the voltage feedback circuit is electrically connected with the input end of the power switch circuit. According to the audio switching power supply, voltage with high stability, small ripple coefficient and low noise can be output.
Description
Technical Field
The utility model relates to the technical field of switching power supplies, in particular to an audio switching power supply.
Background
The audio power amplifier of the speaker usually requires a switching power supply, which is one of the important factors determining whether the speaker can perfectly reproduce the audio signal because the speaker is a special audio device. When the traditional switching power supply is applied to an audio power amplifier, the output voltage is not stable enough, and various electromagnetic interferences exist in a circuit, so that the ripple component is large, the sound is polluted, and the bottom noise of the sound box is serious. In addition, when the sound box plays some loud acoustic music, the switching power supply of the audio power amplifier is often required to have enough power reserve, and the traditional switching power supply is often smaller in power, so that the requirements cannot be met.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a stable audio switching power supply.
According to an embodiment of the utility model, an audio switching power supply includes:
a power input interface;
the input end of the second-stage low-pass filter network is electrically connected with the power input interface;
the input end of the first rectifying and filtering circuit is electrically connected with the output end of the second-stage low-pass filtering network;
the input end of the power switch circuit is electrically connected with the output end of the first rectifying and filtering circuit;
the input end of the second rectifying and filtering circuit is electrically connected with the output end of the power switch circuit, and the output end of the second rectifying and filtering circuit is used for being connected with a load;
and the input end of the voltage feedback circuit is electrically connected with the output end of the second rectifying and filtering circuit, and the output end of the voltage feedback circuit is electrically connected with the input end of the power switch circuit.
According to some embodiments of the utility model, a fuse is further provided between the power input interface and the secondary low-pass filter network.
According to some embodiments of the utility model, the second-stage low-pass filter network comprises:
a thermistor, a first end of which is electrically connected with a first end of the power input interface;
the first input end of the first common mode inductor is electrically connected with the second end of the thermistor, and the second input end of the first common mode inductor is electrically connected with the second end of the power input interface through the fuse;
the first end of the first capacitor is electrically connected with the first output end of the first common-mode inductor, and the second end of the first capacitor is electrically connected with the second output end of the first common-mode inductor;
a second common mode inductor, wherein a first input end of the second common mode inductor is electrically connected with a first end of the first capacitor, and a second input end of the second common mode inductor is electrically connected with a second end of the first capacitor;
and the first end of the second capacitor is electrically connected with the first output end of the second common-mode inductor, and the second end of the second capacitor is electrically connected with the second output end of the second common-mode inductor.
According to some embodiments of the utility model, the second-stage low-pass filter network further comprises:
the first end of the first resistor is electrically connected with the first output end of the first common-mode inductor;
the first end of the second resistor is electrically connected with the second end of the first resistor, and the second end of the second resistor is electrically connected with the second output end of the first common-mode inductor;
a third resistor, a first end of which is electrically connected with a first end of the first resistor;
a fourth resistor, the first end of the fourth resistor being electrically connected to the second end of the third resistor, the second end of the fourth resistor being electrically connected to the second end of the second resistor; the connection point between the first resistor and the second resistor is electrically connected with the connection point between the third resistor and the fourth resistor.
According to some embodiments of the utility model, the first rectifying and filtering circuit includes:
the input end of the rectifier bridge is electrically connected with the output end of the second-level low-pass filter network;
and the first end of the third capacitor is electrically connected with the output end of the rectifier bridge and the input end of the power switch circuit respectively, and the second end of the third capacitor is grounded.
According to some embodiments of the utility model, the power switching circuit comprises:
the first end of the primary coil of the pulse transformer is electrically connected with the output end of the first rectifying and filtering circuit, and the secondary coil of the pulse transformer is electrically connected with the input end of the second rectifying and filtering circuit;
the drain electrode of the MOS tube is electrically connected with the second end of the primary coil of the pulse transformer;
the starting pin of the DC-DC control chip is electrically connected with the output end of the first rectifying and filtering circuit, the output pin of the DC-DC control chip is electrically connected with the grid electrode of the MOS tube, the voltage feedback pin of the DC-DC control chip is electrically connected with the output end of the voltage feedback circuit, and the current detection pin of the DC-DC control chip is electrically connected with the source electrode of the MOS tube.
According to some embodiments of the utility model, the DC-DC control chip is model GR8874.
According to some embodiments of the utility model, the voltage feedback circuit includes a voltage reference diode and a photo-coupler, a reference voltage end of the voltage reference diode is electrically connected with an output end of the second rectifying and filtering module through a fifth resistor, an anode end of the voltage reference diode is grounded, a cathode end of the voltage reference diode is electrically connected with an input end of the photo-coupler, and an output end of the photo-coupler is electrically connected with a voltage feedback pin of the DC-DC control chip.
The audio switching power supply provided by the embodiment of the utility model has at least the following beneficial effects: the alternating current mains supply enters the switching power supply through the power supply input interface, a secondary low-pass filter network filters high-frequency interference signals in the mains supply, and the high-frequency signals generated by the switching power supply are ensured not to be connected in series into a power grid; then, the power supply enters a first rectifying and filtering circuit to carry out rectification and filtering to form direct-current voltage which is supplied to a power switching circuit; the power switch circuit controls the change rate of voltage and current by controlling the on and off of the switch, so as to form the required voltage, and outputs direct-current voltage to a load after rectification and filtering by the second rectification and filtering circuit; meanwhile, the voltage output by the second rectifying and filtering circuit is fed back to the power switching circuit through the voltage feedback circuit to form a closed loop structure, so that the voltage output is stabilized, and finally the audio switching power supply with high stability, small ripple coefficient, low noise and wider working frequency range is obtained.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic diagram of a module of an audio switching power supply according to an embodiment of the present utility model;
FIG. 2 is a schematic circuit diagram of a two-stage low-pass filter network and a first rectifying filter circuit according to an embodiment of the present utility model;
FIG. 3 is a schematic circuit diagram of a power switching circuit, a second rectifying and filtering circuit, and a voltage feedback circuit according to an embodiment of the present utility model;
the power supply comprises a power input interface 100, a two-stage low-pass filter network 200, a first rectifying and filtering circuit 300, a power switch circuit 400, a second rectifying and filtering circuit 500 and a voltage feedback circuit 600.
Detailed Description
Reference will now be made in detail to the present embodiments of the present utility model, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present utility model, but not to limit the scope of the present utility model.
In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
As shown in fig. 1, an audio switching power supply according to an embodiment of the present utility model includes a power input interface 100, a two-stage low-pass filter network 200, a first rectifying and filtering circuit 300, a power switching circuit 400, a second rectifying and filtering circuit 500, and a voltage feedback circuit 600; the input end of the second-stage low-pass filter network 200 is electrically connected with the power input interface 100, the output end of the second-stage low-pass filter network 200 is electrically connected with the input end of the first rectifying and filtering circuit 300, the output end of the first rectifying and filtering circuit 300 is electrically connected with the input end of the power switch circuit 400, the output end of the power switch circuit 400 is electrically connected with the input end of the second rectifying and filtering circuit 500, and the output end of the second rectifying and filtering circuit 500 is used for being connected with a load; an input terminal of the voltage feedback circuit 600 is electrically connected to an output terminal of the second rectifying and filtering circuit 500, and an output terminal of the voltage feedback circuit 600 is electrically connected to an input terminal of the power switching circuit 400.
According to the audio switching power supply provided by the embodiment of the utility model, alternating current commercial power enters the switching power supply through the power input interface 100 (J3), the two-stage low-pass filter network 200 filters high-frequency interference signals in the commercial power, and the high-frequency signals generated by the switching power supply are ensured not to be connected in series into a power grid; subsequently, the power supply enters the first rectifying and filtering circuit 300 to rectify and filter, so as to form a direct-current voltage to be supplied to the power switching circuit 400; the power switching circuit 400 controls the rate of change of the voltage and the current by controlling the on and off of the switch, thereby forming a desired voltage, and outputs a dc voltage to the load after rectification and filtering by the second rectifying and filtering circuit 500; meanwhile, the voltage output by the second rectifying and filtering circuit 500 is fed back to the power switch circuit 400 through the voltage feedback circuit 600 to form a closed loop structure, so that the voltage output is stabilized, and finally the audio switch power supply with high stability, small ripple coefficient, low noise and wider working frequency range is obtained.
Specifically, as shown in fig. 2, in some embodiments of the present utility model, a fuse F1 is further disposed between the power input interface J3 and the two-stage low-pass filter network 200. The fuse F1 plays a role in overcurrent protection and prevents the circuit from being damaged due to overlarge current.
As shown in fig. 2, the two-stage low-pass filter network 200 includes a thermistor NTC1, a first common-mode inductor L1, a first capacitor C1, a second common-mode inductor L2, and a second capacitor C2, where a first end of the thermistor NTC1 is electrically connected to a first end of the power input interface J3 (i.e., pin 2 of J3), a second end of the thermistor NTC1 is electrically connected to a first input end of the first common-mode inductor L1 (i.e., pin 3 of L1), and a second input end of the first common-mode inductor L1 (i.e., pin 1 of L1) is electrically connected to a second end of the power input interface J3 (i.e., pin 1 of J3) through a fuse F1; the first end of the first capacitor C1 is electrically connected with the first output end of the first common mode inductor L1 (namely the 4 th pin of L1), and the second end of the first capacitor C1 is electrically connected with the second output end of the first common mode inductor L1 (namely the 2 nd pin of L1); the first input end of the second common-mode inductor L2 (namely the 4 th pin of L2) is electrically connected with the first end of the first capacitor C1, and the second input end of the second common-mode inductor L2 (namely the 2 nd pin of L2) is electrically connected with the second end of the first capacitor C1; the first end of the second capacitor C2 is electrically connected to the first output end of the second common-mode inductor L2 (i.e., the 3 rd pin of L2), and the second end of the second capacitor C2 is electrically connected to the second output end of the second common-mode inductor L2 (i.e., the 1 st pin of L2). The second-stage low-pass filter network 200 is used for filtering high-frequency interference signals in the alternating current commercial power and ensuring that high-frequency signals generated by the switching power supply are not connected in series with the power grid.
As shown in fig. 2, in some embodiments of the present utility model, the first low-pass filter network 100 further includes a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4; the first end of the first resistor R1 is electrically connected with the first output end of the first common-mode inductor L1, the second end of the first resistor R1 is electrically connected with the first end of the second resistor R2, and the second end of the second resistor R2 is electrically connected with the second output end of the first common-mode inductor L1; the first end of the third resistor R3 is electrically connected with the first end of the first resistor R1, the second end of the third resistor R3 is electrically connected with the first end of the fourth resistor R4, and the second end of the fourth resistor R4 is electrically connected with the second end of the second resistor R2; the connection point between the first resistor R1 and the second resistor R2 is electrically connected to the connection point between the third resistor R3 and the fourth resistor R4.
As shown in fig. 2, in some embodiments of the present utility model, the first rectifying and filtering circuit 300 includes a rectifying bridge BD1 and a third capacitor C3, wherein an input terminal of the rectifying bridge BD1 is electrically connected to an output terminal of the second low-pass filtering network 200 (i.e. a 2 nd pin and a 3 rd pin of the rectifying bridge BD1 are respectively electrically connected to two ends of the second capacitor C2), an output terminal of the rectifying bridge BD1 (i.e. a 1 st pin of the BD 1) is electrically connected to a first terminal of the third capacitor C3, a 4 th pin of the rectifying bridge BD1 and a second terminal of the third capacitor C3 are grounded, and an output terminal of the third capacitor C3 outputs the dc voltage VBUS to the power switch circuit 400. The first rectifying and smoothing circuit 300 is used for rectifying and smoothing the power supply, and outputs a direct current of about +300V to the power switching circuit 400.
As shown in fig. 3, in some embodiments of the present utility model, the power switch circuit 400 includes components such as a pulse transformer T1, a MOS transistor Q3, and a DC-DC control chip U1, a first end of a primary coil of the pulse transformer T1 (i.e., a 4 th pin of the T1) is electrically connected to an output end (i.e., VBUS) of the first rectifying and filtering circuit 300, a second end of the primary coil of the pulse transformer T1 (i.e., a 6 th pin of the T1) is electrically connected to a drain electrode of the MOS transistor Q3, and a secondary coil of the pulse transformer T1 is electrically connected to an input end of the second rectifying and filtering circuit 500; the grid electrode of the MOS tube Q3 is electrically connected with an output pin OUT of the DC-DC control chip U1 through a diode D5 and a resistor R17, a starting pin HV of the DC-DC control chip U1 is electrically connected with the output end of the first rectifying and filtering circuit 300 through a resistor R15 and a resistor R16, a voltage feedback pin COMP of the DC-DC control chip U1 is electrically connected with the output end of the voltage feedback circuit 600, and a current detection pin CS of the DC-DC control chip U1 is electrically connected with the source electrode of the MOS tube Q3 through a resistor R28. The model of the DC-DC control chip U1 is GR8874. The power switching circuit 400 stores high-frequency energy in the pulse transformer T1, and transfers the energy to the secondary of the pulse transformer T1 when the MOS transistor Q3 is turned off, and a stable dc voltage is obtained after rectification and filtering by the second rectifying and filtering circuit 500, and is supplied to a load. The pulse transformer T1 can function as follows: firstly, the conversion of electric field-magnetic field-electric field energy is realized, and stable direct current voltage is provided for a load; secondly, the transformer function can be realized, and multiple paths of different direct-current voltage values can be output through the primary winding and the multiple secondary windings of the pulse transformer T1, so that direct-current electric quantity is provided for different circuit units; thirdly, the electric isolation effect can be realized, the hot ground and the cold ground are isolated, electric shock accidents are avoided, and the safety of a user terminal is ensured.
As shown in fig. 3, in some embodiments of the present utility model, the second rectifying and filtering circuit 500 includes components such as a diode D1, a diode D2, a diode D8, a resistor R33, a resistor R34, a resistor R35, a resistor R46, a capacitor C13, a capacitor C4, a capacitor C8, a capacitor C23, a capacitor C5, a capacitor C6, and a capacitor C11, and is configured to rectify and filter the voltage output by the power switch circuit 400, and then output different dc voltage values such as +12v, +24v, and +6v to different circuit units.
As shown in fig. 3, in some embodiments of the present utility model, the voltage feedback circuit 600 includes components such as a voltage reference diode U8 and a photo-coupler U6, a reference voltage end of the voltage reference diode U8 is electrically connected to an output end of the second rectifying and filtering module 500 through a fifth resistor R5, an anode end of the voltage reference diode U8 is grounded, a cathode end of the voltage reference diode U8 is electrically connected to an input end of the photo-coupler U6, and an output end of the photo-coupler U6 is electrically connected to a voltage feedback pin COMP of the DC-DC control chip U1 through a zener diode Z3 and a capacitor C56. The voltage feedback circuit 600 is configured to feed back the voltage output by the second rectifying and filtering module 500 to the voltage feedback pin COMP of the DC-DC control chip U1, thereby forming a closed loop structure and stabilizing the output of the voltage. The voltage reference diode U8 is of the type AP431SRG-SOT-23-DIODES.
According to the audio switching power supply provided by the embodiment of the utility model, the audio switching power supply has the performance indexes of small volume, light weight, high efficiency, high power, high stability, low noise and wider working frequency range through the design and optimization of the control circuit in the switching power supply. According to the audio switching power supply provided by the embodiment of the utility model, the change rate of voltage and current in the circuit is reduced through the two-stage low-pass filter network 200, the first rectifying and filtering circuit 300 and the second rectifying and filtering circuit 500, the ripple coefficient is reduced, and the sound is effectively prevented from being polluted; the power switching circuit 400 corrects the converted waveform by a soft switching technique to reduce harmonic components in the circuit; the reasonable power switch circuit is designed and optimized, and the change rate of voltage and current when the switch is turned on and off is controlled; the voltage feedback circuit 600 forms a closed loop structure to further stabilize the voltage output. The audio switching power supply adopts a double loop feedback (namely, an external sampling feedback loop is isolated by the voltage feedback circuit 600, and a peak current sampling feedback internal loop is magnetized by the primary coil of the pulse transformer T1) control system with good stability, so that a pulse duty ratio is quickly adjusted by PWM signals, and further, the output voltage of the previous period and the peak current magnetized by the primary coil are effectively adjusted in each period, and the purpose of stabilizing the output voltage is achieved.
In the description of the present specification, a description referring to the terms "one embodiment," "further embodiment," "some specific embodiments," or "some examples," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. An audio switching power supply, comprising:
a power input interface;
the input end of the second-stage low-pass filter network is electrically connected with the power input interface;
the input end of the first rectifying and filtering circuit is electrically connected with the output end of the second-stage low-pass filtering network;
the input end of the power switch circuit is electrically connected with the output end of the first rectifying and filtering circuit;
the input end of the second rectifying and filtering circuit is electrically connected with the output end of the power switch circuit, and the output end of the second rectifying and filtering circuit is used for being connected with a load;
and the input end of the voltage feedback circuit is electrically connected with the output end of the second rectifying and filtering circuit, and the output end of the voltage feedback circuit is electrically connected with the input end of the power switch circuit.
2. The audio switching power supply of claim 1, wherein a fuse is further provided between the power input interface and the secondary low pass filter network.
3. The audio switching power supply of claim 2 wherein said two-stage low pass filter network comprises:
a thermistor, a first end of which is electrically connected with a first end of the power input interface;
the first input end of the first common mode inductor is electrically connected with the second end of the thermistor, and the second input end of the first common mode inductor is electrically connected with the second end of the power input interface through the fuse;
the first end of the first capacitor is electrically connected with the first output end of the first common-mode inductor, and the second end of the first capacitor is electrically connected with the second output end of the first common-mode inductor;
a second common mode inductor, wherein a first input end of the second common mode inductor is electrically connected with a first end of the first capacitor, and a second input end of the second common mode inductor is electrically connected with a second end of the first capacitor;
and the first end of the second capacitor is electrically connected with the first output end of the second common-mode inductor, and the second end of the second capacitor is electrically connected with the second output end of the second common-mode inductor.
4. The audio switching power supply of claim 3 wherein said two-stage low pass filter network further comprises:
the first end of the first resistor is electrically connected with the first output end of the first common-mode inductor;
the first end of the second resistor is electrically connected with the second end of the first resistor, and the second end of the second resistor is electrically connected with the second output end of the first common-mode inductor;
a third resistor, a first end of which is electrically connected with a first end of the first resistor;
a fourth resistor, the first end of the fourth resistor being electrically connected to the second end of the third resistor, the second end of the fourth resistor being electrically connected to the second end of the second resistor; the connection point between the first resistor and the second resistor is electrically connected with the connection point between the third resistor and the fourth resistor.
5. The audio switching power supply of claim 1 wherein said first rectifying and filtering circuit comprises:
the input end of the rectifier bridge is electrically connected with the output end of the second-level low-pass filter network;
and the first end of the third capacitor is electrically connected with the output end of the rectifier bridge and the input end of the power switch circuit respectively, and the second end of the third capacitor is grounded.
6. The audio switching power supply of claim 1 wherein the power switching circuit comprises:
the first end of the primary coil of the pulse transformer is electrically connected with the output end of the first rectifying and filtering circuit, and the secondary coil of the pulse transformer is electrically connected with the input end of the second rectifying and filtering circuit;
the drain electrode of the MOS tube is electrically connected with the second end of the primary coil of the pulse transformer;
the starting pin of the DC-DC control chip is electrically connected with the output end of the first rectifying and filtering circuit, the output pin of the DC-DC control chip is electrically connected with the grid electrode of the MOS tube, the voltage feedback pin of the DC-DC control chip is electrically connected with the output end of the voltage feedback circuit, and the current detection pin of the DC-DC control chip is electrically connected with the source electrode of the MOS tube.
7. The audio switching power supply of claim 6, wherein the DC-DC control chip is model GR8874.
8. The audio switching power supply of claim 6, wherein the voltage feedback circuit comprises a voltage reference diode and a photo coupler, a reference voltage end of the voltage reference diode is electrically connected with the output end of the second rectifying and filtering circuit through a fifth resistor, an anode end of the voltage reference diode is grounded, a cathode end of the voltage reference diode is electrically connected with the input end of the photo coupler, and an output end of the photo coupler is electrically connected with the voltage feedback pin of the DC-DC control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223217073.5U CN219181414U (en) | 2022-12-01 | 2022-12-01 | Audio switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223217073.5U CN219181414U (en) | 2022-12-01 | 2022-12-01 | Audio switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219181414U true CN219181414U (en) | 2023-06-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223217073.5U Active CN219181414U (en) | 2022-12-01 | 2022-12-01 | Audio switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219181414U (en) |
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- 2022-12-01 CN CN202223217073.5U patent/CN219181414U/en active Active
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