Increase the situation in order to explain the battery duration when is realized through the G audio amplifier, our calculation is because of the following value:
PBATT: Power of battery
VBATT: Mains voltage of the battery
IBATT: Electric current of the battery power
VDD: DC/DC converter output voltage
cell phone jammer PDD: DC/DC converter output power
VOUT: Load voltage
RL: Load impedance
POUT: Support the power consumption
IOUT: Load current
In a standard class ab amplifier, the power electric current means exporting the electric current IBATT = IOUT . Use G types step down the converter When, the electric current of the power battery It is part of output current, it is with formula IBATT =
car gps tracker IDD x VDD/VBATT shows.
Suppose an amplifier, 200 mVRMS driving 32 Ohm to support, support the output current: IOUT = VOUT/RL =200mVRMS/32=6.25 mA. Assume the quiescent current is 1 mA IDDQ ,Then the totalcurrent that the amplifier draws is: IBATT =7.25 mA.
Then, the algorithmic method of the total power that the class ab amplifier draws is as follows suppose it is Li-Ion battery as the lithium ion of a 4.2V :
PBATT Class-AB =VBATT x IBATT =4.2V x 7.25 mA =30.45 mW Eq. 1
In terms of G amplifer A, its rail of voltage is produced by a switch type DC/DC converter, it depends on DC/DC converter output voltage and efficiency to supply the power. Suppose DC/DC converter output voltage is 1.3V, then the calculation equation is:
PDD = VDD*IDD =1.3v * 7.25mA =9.425 mW Eq. 2
The power of aggregate supply is DC/DC converter output power except that with DC/DC converter efficiency. Suppose that efficiency is 90% to step down, the total power offered to G amplifer A is:
PBATT Class-G =PDD/ 90% = 11.09 mW Eq. 3
At this moment, under the same condition, compare the class ab amplifier, there is about 3 times more less power that the G earphone amplifier draws. The reducing intensity and VBATT/VDD of power consumption becomes straight proportionate relationships. In we give an example, it is that 4.2/1.3 *Converter – efficiency =4.2/1.3*0.9 =~3
The electric-saving situation of the battery is shown as Fig. 1. Here, we use it by the battery-opwered totally identical A-IN of a lithium ion, compare with two ABs and G earphone amplifier. Just as we observed, compare the class ab amplifier 70 hours ,G Kind earphone amplifier battery duration 150 hours It is long 2 times are many. To the terminal user who uses the walkie audiofrequency apparatus, this means more long music reproduction time and holding time.
The battery discharge curve of Fig. 1 indicates G amplifer A has more long operation time than the class ab amplifier
In a word, it
Mobile Phone Watches is AB a kind of topological revision that the G audio amplifier is topological, it has power of adaptation, can change with source of the audio frequency. The topological structure reduce power consumption, raise the efficiency, thus bring long the intersection of battery and duration for using G amplifer A topological earphone.
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