CN218499013U - High-power amplifier startup soft start circuit - Google Patents
High-power amplifier startup soft start circuit Download PDFInfo
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- CN218499013U CN218499013U CN202221436778.3U CN202221436778U CN218499013U CN 218499013 U CN218499013 U CN 218499013U CN 202221436778 U CN202221436778 U CN 202221436778U CN 218499013 U CN218499013 U CN 218499013U
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Abstract
The utility model discloses a soft start circuit for the startup of a high-power amplifier, which comprises a transformer T1, a power switch SW1, a current-limiting resistor R2, a relay K1, a switch tube Q1, a capacitor C1, serially connected C3-6, a resistor R1 and rectifier bridges BD1 and BD2; through the structure, current can be limited through the current-limiting resistor R2 at the moment of starting up, so that the rectifier bridge BD2 slowly charges the capacitor C3-6, the other path of the transformer T1 charges the capacitor C1 through the rectifier bridge BD1, the full charge time of the capacitor C1 is consistent with that of the capacitor C3-6, when the power supply voltage of the capacitor C1 reaches the conduction voltage of the switch tube Q1, the switch tube Q1 is conducted, so that the coil of the relay K1 is electrified, the contact of the relay K1 is closed, the current-limiting resistor R2 is short-circuited, and the relay K1 is not provided with a resistance value when being conducted, so that the transformer T1 can work at the maximum current, the instant large-current impact of starting up is avoided, and the purpose of protecting the switch is achieved.
Description
Technical Field
The utility model relates to an electronic circuit field, in particular to high-power amplifier start soft start circuit.
Background
The sound equipment is common equipment in daily life, the sound equipment with higher power can be used in professional occasions, and at the moment of starting a common high-power amplifier, because a transformer is connected to charge 4 10000Uf/63V filter capacitors of the power amplifier, the instantaneous current is very high, a power switch and a fuse are easily burnt under the high-current impact, even the voltage instability of a family can be influenced, and other electric appliances are impacted to flicker; therefore, a power amplifier startup soft start circuit is urgently needed to solve the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a high-power amplifier start soft start circuit.
The utility model discloses a technical scheme that its technical problem was solved to an embodiment adopted is: a high-power amplifier startup soft start circuit comprises a transformer T1, a power switch SW1, a current-limiting resistor R2, a relay K1, a switch tube Q1, a capacitor C1, serially connected C3-6, a resistor R1, a rectifier bridge BD1 and a BD2, wherein one end of the power switch SW1 is connected with one end of an external power supply, the other end of the power switch SW1 is respectively connected with one end of the current-limiting resistor R2 and one end of a contact of the relay K1, the other end of the current-limiting resistor R2, the other end of the contact of the relay K1 and the other end of the external power supply are connected with a primary winding of the transformer T1, two ends of a first secondary winding of the transformer T1 are respectively connected with an input end of the rectifier bridge BD2, an output end of the rectifier bridge BD2 is respectively connected with two ends of the serially connected capacitors C3-6 and a power amplifier, two ends of a second secondary winding of the transformer T1 are respectively connected with an input end of the rectifier bridge BD1, an output end of the rectifier bridge BD1 is respectively connected with one end of the resistor R1 and one end of the relay K1, the other end of the switch tube Q1 is connected with a ground terminal of the switch tube, and a control terminal of the capacitor Q1.
Further, a current limiting resistor R2 is provided as a thermistor.
The utility model has the advantages that: a startup soft start circuit of a high-power amplifier comprises a transformer T1, a power switch SW1, a current-limiting resistor R2, a relay K1, a switch tube Q1, a capacitor C1, serially connected C3-6, a resistor R1, rectifier bridges BD1 and BD2; through the structure, current can be limited through the current-limiting resistor R2 at the moment of starting up, so that the rectifier bridge BD2 slowly charges the capacitor C3-6, the other path of the transformer T1 charges the capacitor C1 through the rectifier bridge BD1, the full charge time of the capacitor C1 is consistent with that of the capacitor C3-6, when the power supply voltage of the capacitor C1 reaches the conduction voltage of the switch tube Q1, the switch tube Q1 is conducted, so that the coil of the relay K1 is electrified, the contact of the relay K1 is closed, the current-limiting resistor R2 is short-circuited, and the relay K1 is not provided with a resistance value when being conducted, so that the transformer T1 can work at the maximum current, the instant large-current impact of starting up is avoided, and the purpose of protecting the switch is achieved.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a circuit of a power amplifier startup soft start circuit.
Detailed Description
This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.
In the description of the present invention, the meaning of a plurality is two or more, and the terms greater than, less than, exceeding, etc. are understood as excluding the number, and the terms greater than, less than, and the like are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise explicitly defined, the terms "set," "installed," "connected," and the like are to be understood in a broad sense, and for example, may be directly connected or may be indirectly connected through an intermediate medium; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be a mechanical connection; either as communication within the two elements or as an interactive relationship of the two elements. The technical skill in the art can reasonably determine the specific meaning of the above words in the present invention by combining the specific contents of the technical solution.
Referring to fig. 1, a power amplifier startup soft start circuit with high power includes a transformer T1, a power switch SW1, a current limiting resistor R2, a relay K1, a switch tube Q1, a capacitor C1, C3-6 connected in series, a resistor R1, a rectifier bridge BD1, and a BD2, wherein one end of the power switch SW1 is connected to one end of an external power supply, the other end of the power switch SW1 is connected to one end of the current limiting resistor R2 and one end of a contact of the relay K1, the other end of the current limiting resistor R2, the other end of the contact of the relay K1, and the other end of the external power supply are connected to a primary winding of the transformer T1, two ends of a first secondary winding of the transformer T1 are connected to an input end of the rectifier bridge BD2, an output end of the rectifier bridge BD2 is connected to two ends of the capacitors C3-6 connected in series and a power amplifier, two ends of a second secondary winding of the transformer T1 are connected to an input end of the rectifier bridge BD1, an output end of the rectifier bridge BD1 is connected to one end of the resistor R1 and one end of the relay K1, another end of the switch tube Q1 is connected to one end of the switch tube, and another end of the capacitor Q1, and another end of the capacitor C1 are connected to a ground of the capacitor C1, and a control terminal of the capacitor Q1.
The current limiting resistor R2 is provided as a thermistor.
The utility model discloses in, L, external power source is connected to N, press switch SW1 after, external power source passes through switch SW1 this moment, current-limiting resistor R2, transformer T1 forms the turn-on circuit, but carry out the current-limiting because of circuit cluster current-limiting resistor R2, so transformer T1's first secondary winding is through rectifier bridge DB2 to electric capacity C3, C4, C5, C6 carries out slow charging, meanwhile transformer T1's second secondary winding is through rectifier bridge BD1, resistance R1 charges to electric capacity C1, when electric capacity C1 mains voltage slowly rises, be greater than when conducting voltage, (electric capacity C3 this moment, C4, C5, C6 also slowly are full of), switch tube Q1 begins to switch on, electric capacity C1's the full charge time and electric capacity C3, C4, C5, C6 is full of electricity time unanimous, can draw relay K1's 2 feet down after switch tube Q1 switches on, the electric current passes through relay K1, switch tube Q1 return circuit, K1 actuation, switch relay K1's contact actuation, switch-on relay is because the maximum current that can reach this moment when the switch-on relay, the electric current rush current protection relay, the electric current can be the biggest electric current of this moment, the electric relay, the purpose of this moment, the electric current is avoided, the big current impact of switch-on relay, the electric current.
Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications and substitutions are included in the scope defined by the claims of the present application.
Claims (2)
1. A high-power amplifier startup soft start circuit is characterized in that: the power supply comprises a transformer T1, a power switch SW1, a current-limiting resistor R2, a relay K1, a switch tube Q1, a capacitor C1, serially connected C3-6, a resistor R1, a rectifier bridge BD1 and a BD2, wherein one end of the power switch SW1 is connected with one end of an external power supply, the other end of the power switch SW1 is respectively connected with one end of the current-limiting resistor R2 and one end of a contact of the relay K1, the other end of the current-limiting resistor R2, the other end of the contact of the relay K1 and the other end of the contact of the external power supply are connected with a primary winding of the transformer T1, two ends of a first secondary coil of the transformer T1 are respectively connected with an input end of the rectifier bridge BD2, an output end of the rectifier bridge BD2 is respectively connected with two ends of the serially connected capacitors C3-6 and a power amplifier, two ends of a second secondary winding of the transformer T1 are respectively connected with an input end of the rectifier bridge BD1, an output end of the rectifier bridge BD1 is respectively connected with one end of the resistor R1 and one end of the relay K1, the other end of the relay K1 is respectively connected with one end of the switch tube Q1, and the other end of the capacitor C1, and the other end of the capacitor C1 are respectively connected with a control terminal of the switch tube.
2. The power amplifier startup soft start circuit of claim 1, characterized in that: the current limiting resistor R2 is set as a thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221436778.3U CN218499013U (en) | 2022-06-08 | 2022-06-08 | High-power amplifier startup soft start circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221436778.3U CN218499013U (en) | 2022-06-08 | 2022-06-08 | High-power amplifier startup soft start circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218499013U true CN218499013U (en) | 2023-02-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221436778.3U Active CN218499013U (en) | 2022-06-08 | 2022-06-08 | High-power amplifier startup soft start circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218499013U (en) |
-
2022
- 2022-06-08 CN CN202221436778.3U patent/CN218499013U/en active Active
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