Power amplifier with hot plugging function
A hot-swap and functional technology, applied in the field of power amplifiers, can solve problems such as large inrush current, connector ignition and oxidation, reset, etc., and achieve the effects of low cost, small footprint and simple design
Active Publication Date: 2013-11-20
SUNWAVE COMM
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Problems solved by technology
[0003] The power amplifier is an important part of the communication equipment. At the same time, because the power amplifier has relatively high requirements on the power supply, a filter circuit is generally added after the DC power input terminal when designing the power amplifier. figure 1 , and these filter circuits have a large number of capacitors and need one or more capacitors with a capacitance of hundreds of uF or more. Therefore, when the power amplifier is hot-swappable, the DC power input port on the power amplifier is in an instant short circuit state , resulting in a large inrush current, causing ignition and oxidation of the connector, or causing other components of the communication system to be reset due to short-term overvoltage or undervoltage of the DC power supply
Method used
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[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. While the invention will be described in conjunction with the preferred embodiments, it will be understood that it is not intended to limit the invention to the described embodiments. On the contrary, the invention is to cover alternatives, modifications and equivalents, which may be included within the scope of the invention as defined by the appended claims.
[0019] Such as Figure 7 The schematic diagram of the power amplifier circuit with hot-swappable function of the present invention is shown: there is a MOS tube slow start circuit on the power amplifier DC power supply, and the circuit is composed of a MOS tube device and an RC charging circuit. The charging process during the unplugging operation is carried out through the MOS tube; the power amplifier opening control signal PA-EN controls the state of the MOS after passing through the RC chargi...
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The invention discloses a power amplifier with a hot plugging function. A hot plugging function circuit 1 is arranged between a power VCC1 and a filter circuit 1. A hot plugging function circuit 2 is arranged between a power VCC2 and a filter circuit 2. The hot plugging function circuit 1 and the hot plugging function circuit 2 are controlled through an amplifier start control signal PA-EN. The power amplifier has the advantages that an amplifier direct-current power source is provided with an MOS transistor soft start circuit which comprises an MOS transistor and an RC charge circuit; after passing the RC charge circuit, the amplifier start control signal PA-EN controls the state of the MOS transistor, the MOS transistor is turned on from being turned off, drain-source impedance RDS gradually decreases from open circuit to approximately 0hm, and accordingly the power amplifier is charged and normally powered by the direct-current power source; the whole hot plugging function circuit is simple in design, low in cost and small in size.
Description
technical field [0001] The invention relates to a power amplifier, more specifically, it relates to a power amplifier with a hot plug function. Background technique [0002] With the development of communication electronic technology, customers have higher and higher requirements for the reliability of communication equipment, and the long-term interruption of communication network will lead to large-scale complaints and economic losses. Therefore, more and more communication devices require that the devices be upgraded, repaired and replaced without interruption of power supply. [0003] The power amplifier is an important part of the communication equipment. At the same time, because the power amplifier has relatively high requirements on the power supply, a filter circuit is generally added after the DC power input terminal when designing the power amplifier. figure 1 , and these filter circuits have a large number of capacitors and need one or more capacitors with a cap...
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Inventor 俞利光李鑫胡晓飞
Owner SUNWAVE COMM