Three working states of power amplifier tube

Three working states of power amplifier tube

The low-frequency power output stage is classified into Class A, Class B, and Class C according to the working state of the power amplifier tube.

They have their own characteristics:



(1). The main advantage of Class A power output stage is low distortion, and the main disadvantage is low efficiency.

Its output power Po, power consumption PD, collector maximum power consumption Pcmax and efficiency are:

Po = Ec2 / 2RL PD = 2Ec2 / RL

Pcmax = 2Ec2 / RL = 4Po η = Po / PD = 1/4 = 25%

(2) The main advantage of Class B power output stage is high efficiency, and the main disadvantage is the existence of severe crossover distortion.

Its output power Po, power consumption PD, collector maximum power consumption Pcmax and efficiency are:

Po = Ec2 / 2RL PD = 2Ec2 / πRL

Pcmax = 2Ec2 / π2RL? 0.4Po η = Po / PD = π / 4 = 78%

(3). Class A and B power output stage absorbs the advantages of Class A and Class B, so it is widely used,

But its circuit structure is more complicated than Class A and Class B. As shown below:


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Lithium Ion Battery For Electric Golf Cart

Advantages of Lithium Golf Batteries
Lithium golf batteries (or LiFePO4 batteries) have been around for a while now on electric golf buggies, but until recently have been quite expensive. Most brands now including MGI Golf, Autocaddy, Motocaddy and Powakaddy come standard with lithium ion batteries. But not only can you get a lithium battery for a new golf buggy, there are suppliers providing them for older buggies by running on the same voltage as a lead acid battery.

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Another advantage is in the weight of the battery. A lithium battery weights on average 5 times less than a similar amp-hour lead acid battery. This makes it easier to lift making it easier to transport to other golf courses. The lighter weight also puts less strain on your buggy and therefore less wear and tear over time. This will improve the life of your buggy and mean less repairs will be required.
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Charging times are also reduced when using lithium batteries over lead acid. Whilst it can take over 8 hours to charge a lead acid battery, a lithium battery can be fully charged in less than 3 hours. Lithium batteries are also able to be left off charge for longer periods of time compared to a lead acid battery. Once fully charged your lithium battery can be left off charge for up to 3 months before any damage occurs, whilst a lead acid battery will start to sulphide within 3 weeks.

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