CN211239798U - Power amplifier power-on time sequence protection circuit - Google Patents
Power amplifier power-on time sequence protection circuit Download PDFInfo
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- CN211239798U CN211239798U CN201921061994.2U CN201921061994U CN211239798U CN 211239798 U CN211239798 U CN 211239798U CN 201921061994 U CN201921061994 U CN 201921061994U CN 211239798 U CN211239798 U CN 211239798U
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- power
- power amplifier
- switch circuit
- converter
- time sequence
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Abstract
The utility model discloses a power amplifier power-on time sequence protection circuit, including chronogenesis switch circuit, stabiliser and DC/DC converter, the first power of stabiliser input termination, output termination chronogenesis switch circuit, first power still is connected with the DC/DC converter, chronogenesis switch circuit input has still connect second power and TTL level signal, chronogenesis switch circuit output termination DC/DC converter enable end, DC/DC converter output termination power amplifier malleation end, the second power divide into two the tunnel, and one of them way connects chronogenesis switch circuit, and another way connects the power amplifier negative pressure end. The utility model discloses circuit link simple structure easily realizes and processes, can not occupy too much volume, and the integrated level is high, can directly integrate to in power and the control PCB link.
Description
Technical Field
The utility model belongs to the technical field of power amplifier in the communication, concretely relates to power amplifier goes up electric time sequence protection circuit.
Background
The power amplifier is called power amplifier for short, commonly called loudspeaker, and is the most basic equipment in sound system, and its task is to amplify the weak electric signal from signal source (from sound console in professional sound system) to drive loudspeaker to make sound.
The power amplifier is used for amplifying weak signals from the sound source or the pre-amplifier and pushing the sound box to play sound. The power of a set of good sound system power amplifier is not available. The power amplifier is the largest family of various sound equipment and mainly has the function of amplifying a weak signal input by a sound source equipment and then generating enough current to push a loudspeaker to replay sound. Different power amplifiers are also different in internal signal processing, circuit design and production process due to the consideration of power, impedance, distortion, dynamics and different application ranges and control and regulation functions.
Along with the great increase of the market demand of the transceiver module, the demand of a transmission link for a high-power amplifier chip is also increased sharply. The power amplifier chip has the requirements on the power-on sequence, particularly the grid voltage, and once the power amplifier chip is not protected by the power-on sequence, the normal working performance of the power amplifier chip is influenced, and the power amplifier chip is likely to be burnt out. In this case, a circuit with timing protection will play an important role.
Disclosure of Invention
For overcoming the not enough of above-mentioned existence, the utility model discloses an inventor is through long-term exploration attempt and many times's experiment and effort, constantly reforms and innovate, has provided a power amplifier power-on sequence protection circuit, and this circuit link simple structure easily realizes and processes, can not occupy too much volume, and the integrated level is high, can directly integrate to in power and the control PCB link.
In order to realize the purpose, the utility model adopts the technical scheme that: a power amplifier power-on time sequence protection circuit comprises a time sequence switch circuit, a voltage stabilizer and a DC/DC converter, wherein the input end of the voltage stabilizer is connected with a first power supply, the output end of the voltage stabilizer is connected with the time sequence switch circuit, the first power supply is also connected with the DC/DC converter, the input end of the time sequence switch circuit is also connected with a second power supply and a TTL level signal, the output end of the time sequence switch circuit is connected with an enabling end of the DC/DC converter, the output end of the DC/DC converter is connected with a power amplifier positive-voltage end, the second power supply is divided into two paths, one path is connected with the time sequence switch circuit, and the.
According to the utility model discloses in power amplifier power sequence protection circuit, its further preferred technical scheme be first power is malleation 24V single power.
According to the utility model discloses in power amplifier power sequence protection circuit, its further preferred technical scheme, the second power is negative pressure 5V single power.
According to the utility model discloses in power amplifier power-on sequence protection circuit, its further preferred technical scheme, second power input sequential switch circuit be-5V's reference voltage.
According to the utility model discloses in power amplifier power sequence protection circuit, its further preferred technical scheme, output voltage is +5V behind the stabiliser for first power.
Compared with the prior art the utility model has the advantages of as follows:
the utility model discloses circuit link simple structure easily realizes and processes, can not occupy too much volume, and the integrated level is high, can directly integrate to in power and the control PCB link.
The utility model discloses a duplicate protection not only can realize not playing the protection and can realize outside TTL level control when adding the negative pressure, satisfies the effect of playing the protection link under the condition that two levels of monitoring normal existence simultaneously.
The utility model discloses the circuit still has the consumption little, and inside NAND gate only needs 1uA starting current can normally advantage such as work.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic block diagram of the design of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the detailed description of the embodiments of the present invention provided below is not intended to limit the scope of the claimed invention, but is merely representative of selected embodiments of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.
Examples
As shown in fig. 1: a power amplifier power-on time sequence protection circuit comprises a time sequence switch circuit, a voltage stabilizer and a DC/DC converter. The circuit of the embodiment is further externally connected with a first power supply, a second power supply and a TTL circuit, wherein the first power supply provides +24V voltage for the circuit, the second power supply provides-5V voltage for the circuit, and the TTL circuit provides TTL level signals for the circuit.
In the circuit, the input end of the voltage stabilizer is connected with a first power supply, the power supply of the first power supply is converted into +5V, and then the +5V power supply is input into the time sequence switch circuit, namely the output end of the voltage stabilizer is connected with the time sequence switch circuit. The first power supply is also connected to a DC/DC converter. The input end of the time sequence switch circuit is also connected with a second power supply and a TTL level signal output by the TTL circuit. The output end of the time sequence switch circuit is connected with the enabling end of the DC/DC converter, and the output end of the DC/DC converter is connected with the positive voltage end of the power amplifier. The second power supply is divided into two paths, wherein one path is used as a reference voltage and connected with a time sequence switch circuit, and the other path is connected with a power amplifier negative voltage end.
The principle of the utility model is that: supply voltage is VCC +24V for, and the negative pressure is-5V (the outside provides), and the function is realized to the TTL level: the high level is normally output, and the low level is turned off. V + OUT and V-OUT respectively provide positive pressure and negative pressure for the power amplifier. EN is an enabling end of the DC/DC power supply module, the port can be high level (enabled) only when TTL is set to be high level and-5V exists at the same time, and the port is low level (turned off) in any other state. The power-on time sequence protection of the power amplifier can be realized through the link, and the power amplifier tube core is prevented from being firstly subjected to positive pressure under the condition that negative pressure is not applied, so that the power amplifier tube core is prevented from being burnt.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. The first feature being "under," "below," and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or merely indicates that the first feature is at a lower level than the second feature.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the spirit and scope of the invention, and such modifications and enhancements are intended to be within the scope of the invention.
Claims (5)
1. A power amplifier power-on sequence protection circuit is characterized in that: the power amplifier comprises a time sequence switch circuit, a voltage stabilizer and a DC/DC converter, wherein the input end of the voltage stabilizer is connected with a first power supply, the output end of the voltage stabilizer is connected with the time sequence switch circuit, the first power supply is further connected with the DC/DC converter, the input end of the time sequence switch circuit is further connected with a second power supply and a TTL level signal, the output end of the time sequence switch circuit is connected with the enabling end of the DC/DC converter, the output end of the DC/DC converter is connected with the positive voltage end of the power amplifier, the second power supply is divided into two paths, one path is connected with the time sequence switch.
2. The power amplifier power-on sequence protection circuit of claim 1, wherein the first power supply is a positive voltage 24V single power supply.
3. The power amplifier power-on sequence protection circuit of claim 1, wherein the second power supply is a negative voltage 5V single power supply.
4. The power amplifier power-on sequence protection circuit of claim 3, wherein the second power input sequence switch circuit is a-5V reference voltage.
5. The power amplifier power-on sequence protection circuit of claim 1, wherein the output voltage of the first power supply after passing through the voltage regulator is + 5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921061994.2U CN211239798U (en) | 2019-07-09 | 2019-07-09 | Power amplifier power-on time sequence protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921061994.2U CN211239798U (en) | 2019-07-09 | 2019-07-09 | Power amplifier power-on time sequence protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211239798U true CN211239798U (en) | 2020-08-11 |
Family
ID=71939363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921061994.2U Active CN211239798U (en) | 2019-07-09 | 2019-07-09 | Power amplifier power-on time sequence protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211239798U (en) |
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2019
- 2019-07-09 CN CN201921061994.2U patent/CN211239798U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A Power Amplifier Power on Timing Protection Circuit Effective date of registration: 20230927 Granted publication date: 20200811 Pledgee: Chengdu small business financing Company Limited by Guarantee Pledgor: CHENGDU JINGLI ELECTRONIC TECHNOLOGY Co.,Ltd. Registration number: Y2023510000226 |