Showing posts with label rectifier. Show all posts
Showing posts with label rectifier. Show all posts
Tuesday, October 20, 2015
Half Wave Stator to Full wave
We all know that small bikes charging system is made up of only a Half wave ac to dc conversion thus making it impossible for the system to give enough juice out from the stator to charge batteries at low rpm...To compensate for a FULL WAVE rectifier be installed on this system, we need to do some modifying to the stator,
the picture shown uses the stock configuration of a Half Wave system with an AC lighting coil present for headlight connection center tapped to the whole winding of the stator. One end of the coil is connected to chassis ground. I order for this system to give way for a FULL WAVE rectifier, the grounding system must be omitted and center tapped connection for headlight must be removed as shown on the next picture below.
the headlight will be redirected to the battery by cutting the yellow line of the AC lighting coil from the Stock regulator/rectifier, so that the headlight ON off switch as well as the HI/LOW system will still be used without any rewiring that headlight path.
ADVANTAGES of this system than the latter.
with full wave regulation you have almost twice usable dc power (and cleaner) than with half wave
last , cleaner regulation with the sens wire, if well used, it deliver more power if their is a drop (big consumption) than the other fixed simplier one where lighting often drop
and better protection for you electronic again drop or over charge
Read more »
ADVANTAGES of this system than the latter.
with full wave regulation you have almost twice usable dc power (and cleaner) than with half wave
last , cleaner regulation with the sens wire, if well used, it deliver more power if their is a drop (big consumption) than the other fixed simplier one where lighting often drop
and better protection for you electronic again drop or over charge
Single phase voltage regulator (full wave)
Here is another voltage regulator for motorcycle design to be used on single phase stator.
This is the simplest full wave design commonly used on almost all commuter bikes with 4 pin connector. Do not be mistaken with the half wave versions, for this one cannot be used on half wave stator design to which the other end of the windings is directly connected to ground. Again this is for a FULL WAVE converted stator design and modifications.
By looking at the schematic, and comparing it to my previous post of voltage regulators, it is almost identical, with the design, and only component values are different. C1, R1, Q1, D1, and R3 compromising the sensing and regulating circuit, whereas D2,D3, Q2 and Q3 are the shunting components of the stator winding.
D4 to D7 are your rectifiers that converts the AC coming from the stator to DC for charging your battery. With the values as shown, the output of this regulator is 14.4 at 5000rpm. You can modify this circuit for your intended application, to output 15 volts rather than 14.4 for quick charging of your battery when there are too much load on your system, by altering D1, to 13 volts rather than 12.6 volts..
This system is Stator dependent...meaning, this can't output more power on what your stator can give, all charging system power rely on your stator max output...
Part list
R1= 3.3k ohms
R2= 1 k ohms
R3= 1.5k ohms
R4= 100 ohms
Q1= 2n5401
C1= 10uf / 25volts
D1= 12.6 volts zener / 1 watt
D2 /D3= 1n4007
SCR1 /SCR2= bt151-500 or bt151-600
D4-D7= bridge rated 100v 10A
Read more »
By looking at the schematic, and comparing it to my previous post of voltage regulators, it is almost identical, with the design, and only component values are different. C1, R1, Q1, D1, and R3 compromising the sensing and regulating circuit, whereas D2,D3, Q2 and Q3 are the shunting components of the stator winding.
D4 to D7 are your rectifiers that converts the AC coming from the stator to DC for charging your battery. With the values as shown, the output of this regulator is 14.4 at 5000rpm. You can modify this circuit for your intended application, to output 15 volts rather than 14.4 for quick charging of your battery when there are too much load on your system, by altering D1, to 13 volts rather than 12.6 volts..
This system is Stator dependent...meaning, this can't output more power on what your stator can give, all charging system power rely on your stator max output...
Part list
R1= 3.3k ohms
R2= 1 k ohms
R3= 1.5k ohms
R4= 100 ohms
Q1= 2n5401
C1= 10uf / 25volts
D1= 12.6 volts zener / 1 watt
D2 /D3= 1n4007
SCR1 /SCR2= bt151-500 or bt151-600
D4-D7= bridge rated 100v 10A
Motorcycle Voltage Regulator DIY
Introduction:
This project is a voltage regulator for a 3-phase, permanent-magnet alternator found on motorcycles. The same design can be used for single-phase alternators simply by eliminating some parts. This project only describes the regulator, even though a rectifier is typically integrated into the unit.
Circuit Analysis:
Please refer to the circuit diagram during the analysis of the circuit.
Overview:
The way this type of regulator controls the alternator’s output voltage is by simply shorting out the stator winding for one cycle of the ac waveform. This is called shunting. This is done because it is much easier to short-circuit an inductor (the stator winding is an inductor) than to open-circuit an inductor. Very high voltages are induced when an inductor circuit is opened. This may cause a breakdown in the winding’s insulator.
The device used to shunt one cycle of one phase is an SCR. A silicon-controlled rectifier acts as a diode when triggered at its gate. It stops conducting when the current drops below a very low threshold value. Once it stops conducting, it will not conduct again until it receives another gate signal.
A voltage detection circuit is used to trigger the gate on each of the three SCRs. The threshold voltage to trigger the gate is selected as 14.6volt (on the motorcycle’s system-voltage). This is when the gate would trigger if there were no capacitor as described in the next paragraph.
Since the voltage from an alternator fluctuates, the detection circuit will trigger during a peak in the waveform of one of the phases, but this causes the average voltage to be too low. To raise the average system-voltage without increasing the detection threshold, a simple capacitor is used to delay the triggering of the SCR gates. The capacitor acts as a filter to reduce the ac ripple going to the detection circuit. If the system voltage was strictly DC voltage (with no ripple) the gate would trigger at 14.6v and the average voltage would be 14.6v. In reality, the average voltage is always less than the threshold voltage and only approaches it as the ripple reduces. The actual trigger voltage is higher than 14.6v, but the average voltage is lower than 14.6v. As the ripple reduces, the average and trigger voltages approach 14.6v.
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