JP3493226B2 - Generator voltage adjustment circuit - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voltage regulator circuit for a generator, and more particularly to a voltage for simultaneously regulating an AC load voltage of a battery, a lamp or the like fed from an AC generator mounted on a small motorcycle or the like. It relates to the adjustment circuit.

[0002]

2. Description of the Related Art FIG. 3 is a conventional circuit diagram of this type. In FIG. 3, 1 is a magneto coil of a magnet type AC generator, (a), (b) and (c) are its output terminals and intermediate taps, L is a lamp, etc. With the AC load, the middle tap (c) and the other end (b) of the magneto coil 1
They are connected to each other via a switch SW. BATT is a battery charged by the output of both terminals (a) and (b) of the generator coil 1, and S1 is between both terminals (a) and (b) of the armature coil 1 or between intermediate taps (c) and (b). ) Connected in parallel with the thyristor (SCR), the polarity of which is ignited in a half cycle which is not used for charging the AC voltage of the AC generator 1 when the voltage of the AC load L or the voltage of the magneto coil 1 exceeds a set value. It is connected to the. COT1 is the AC load L
Alternatively, a control circuit for directly detecting both positive and negative voltages of the magneto coil 1 and giving an ignition signal to the thyristor S1 when the voltage is equal to or higher than a set value, S2 is ignited when the battery BATT is equal to or lower than the set voltage, A second thyristor COT2, which is connected so that a charging current flows through the battery BATT, is a second control circuit which detects the voltage of the battery BATT and gives an ignition signal to the thyristor S2 when the voltage is below a set value.

The operation of this circuit begins with the battery BATT.
When the voltage becomes high, the control circuit COT2 causes the thyristor S
By shutting off the gate current of 2, the battery voltage is controlled to a predetermined value. When the switch SW is closed and the AC load L is activated, the voltage of the load L is controlled by the control circuit COT1.
Half wave or full wave is detected by. When the voltage applied to the load L becomes high, the control circuit COT1 supplies a gate current to the thyristor S1 to turn on the thyristor S1 to short-circuit the generator coil 1 to control the voltage of the load L.

According to such a conventional circuit, since the thyristors S1 and S2 are connected to the forward polarities during the half cycle of the generated output, the thyristor S1 does not operate when the battery is charged, and therefore the voltage control of the battery BATT is performed. On the other hand, the thyristor S2 is in a non-operating state during AC load voltage control, and stable voltage control is possible such that the voltage efficiency of the load can be improved without affecting AC load control. .

[0005]

The above-mentioned circuit has various advantages. On the other hand, in controlling the AC load, since the surplus power of the generator is short-circuited by the thyristor S1, the AC load has a small capacity or a large load fluctuation. In this case, a large short-circuit current flows through the magneto coil 1 and the thyristor S1 and is consumed as heat, which causes a problem that the power supply efficiency is deteriorated.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a voltage regulator suitable for miniaturization of a generator by improving power supply efficiency without impairing the advantages of conventional circuits.

[0007]

SUMMARY OF THE INVENTION The present invention detects a battery charged by an output of a generator coil of a generator, a switching element S2 connected in series to a charging circuit of the battery, and the battery voltage. Then, a second control circuit for controlling the switching element S2 and a field effect transistor D0 having a parasitic diode built-in are connected in series to an AC load between both terminals of the power generation coil or between the intermediate taps, and the field effect is The transistor D0 is controlled by a first control circuit which is controlled by detecting a voltage between both terminals of the power generating coil or an alternating current load voltage, and the first control circuit is a positive and negative half of the power generating coil. A holding circuit that holds the gate bias voltage of the field-effect transistor and a voltage between terminals of the generator coil or an AC load voltage are provided during the period of wave output. When the voltage exceeds the voltage, the holding circuit is opened to control the half-wave output of the generator coil, and when the generator coil has the opposite-polarity half-wave output, the field effect transistor D0 is set to the gate bias state to make a parasitic diode. It is characterized by being provided with an open control circuit for supplying power to an AC load through a battery.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 are basic circuit diagrams showing an embodiment of the present invention. In FIG. 1, the generator coil 1 is provided with an intermediate terminal (c) , one of which is a charging coil L.
1 shows an example in which the other one is a lamp coil L2, and FIG. 2 shows an example of a magneto coil 1 not particularly provided with an intermediate terminal.
B 1 is common to FIG. 2. 1 and 2, MOSF
ET represents a field effect transistor (hereinafter MOSFET) with a built-in parasitic diode D0, which forms a series circuit with the lamp load L and is connected between the lamp coils L2 (FIG. 1) or the generator coil (FIG. 2). There is. COT1 is a MOSFET
, REG indicates a voltage adjusting device, and A to D in the figure indicate respective connection terminals.

The basic operation of this circuit is that when the upper side of the power generation coil 1 (on the side of the charging coil L1) is +, the thyristor S2 is turned on and the battery BATT is charged. When the charging voltage of the battery BATT exceeds a specified value, the control circuit CO
Through T2, thyristor S2 is turned off and charging is stopped.
The above operation is repeated. On the other hand, the MOSFET is reverse-biased between the source and the drain in the above state (in the same manner as the conventional circuit). Tobias state (reduce the impedance of MOSFET)
As a power supply to the lamp L via the parasitic diode D0. This state is repeated.

Next, when the lower side of the magneto coil 1 is + (the polarity opposite to that shown in the figure), the thyristor S2 is turned off and the battery BATT is not charged. On the other hand, in the MOSFET, if the voltage of the lamp L is less than the specified value, the MOSFET is forward biased between the drain and the source and turned on to supply power to the lamp L. When the voltage of the lamp L or the voltage of the magneto coil 1 exceeds a specified value, the operation of the control circuit COT1 causes the MO
The gate bias state of the SFET is released and the MOSFET
Turns off. MOSFET is in this state (ON-OF
Since F) is repeated according to the detected voltage, pulse-shaped control is performed during this period (in the negative half cycle) to limit the lamp voltage to the specified value.

FIGS. 4, 5 and 6 are wiring diagrams of a voltage regulator REG applied to an embodiment of the present invention, in which input / output terminals (a) to (d) correspond to the terminals of FIGS. 1 and 2. To do. First, in FIG. B4, the control circuit COT2 of the thyristor S2 is formed by a reference zener diode ZD1 for battery voltage detection, a limiting resistor R1, a reverse current blocking diode D1, a gate protection diode D2 and the like. , The well-known operation of ON-OFF controlling the gate of the thyristor S2 according to the battery voltage is performed. Next, in the control circuit COT1, (1) is a voltage detection circuit for an AC load voltage or a generator coil, which includes a voltage detection bridge REC and an average value voltage detection capacitor C.
1. Zener diode DZ2 for detection reference, control switch element Tr1 for detection signal generation, resistors R2, R3, etc., and capacitor C1-switch element Tr1-zener diode when the detection voltage exceeds a specified value. A current flows in the path of DZ2 and a voltage detection signal is generated when the switch element Tr1 is turned on. (When detecting the voltage of the generating coil 1, the terminal E in the figure is connected to the terminal A side.)

Next, (2) is a MOSFET gate via.
In the open circuit control circuit, C2 is a gate bias voltage holding coil.
A MOSFET is connected between the gate G and the source S of the MOSFET.
When the drain (D) side has (+) polarity, the diode
It is charged through a charging circuit composed of D3 and resistor R4. Na
By the way, omit the diode D3 and the resistor R4 of this charging circuit.
The voltage detection circuit (1) side resistor R2 and bridge die
It may be replaced with the mode REC. DZ3 is a capacitor
Zener diode that limits the charging voltage of C2 to a specified value
And Tr2 are the gate (G) and source of the MOSFET.
A gate connected between (S) (between both ends of the capacitor C2)
It is a control switch element for releasing the bias. This circuit
The operation of the capacitor C2 is
When the battery is charged to the polarity shown in the figure,
Output for a positive half cycle and a negative half cycle.
Held between the gate and source of the MOSFET.
The as-voltage applied state is maintained. And the pole of the generator coil
Sex is upperButWhen (+) (polarity shown in the figure),
Despite the reverse bias condition, the gate between the source and drain is
AC bias through parasitic diode D0
Supply power to the load side (C terminal). Also, under the generator coilBut
When (+), the control switch element T of the voltage detection circuit (1)
When r1 is turned on, the control switch element Tr2 is turned on (conduction
State), and the electric charge of the capacitor C2 is discharged through Tr2,
The gate-source voltage of the MOSFET is short-circuited to
Turn off (cut off) the SFET.

The circuit operation of FIG. 4 will be described in detail below.
The control operation of the battery BATT is the same as that of the conventional example and will not be described. First, the polarity shown (upper side of the generator coil is (+)
The positive cycle of the AC voltage generated from the coil 1 flows to the parasitic diode D0 of the MOSFET, and the lamp L
Applied to. When the negative cycle of the generated voltage of coil 1
A current flows through the lamp L → diode D3 → resistor R4 → zener DZ3 and capacitor C2 to charge the capacitor C2, and the power supply voltage of the Zener diode DZ3 rises. At the same time, a Zener diode voltage is applied between the MOSFET gate and source, and the MOSFET is turned on. Therefore, the negative cycle of the generated voltage of the coil 1 is applied to the lamp L.
Next, it is generated at both ends of the lamp L due to the increase in the rotation speed of the coil 1.
When voltage rises, resistance R2 → bridge REC
→ resistor R5, capacitor C1 → resistor R6 → bridge REC
→ A current flows through the resistor R7 and detects the lamp L voltage. The capacitor C1 is inserted to detect the voltage applied to the lamp L as an average value. Therefore, flicker of the lamp L is unlikely to occur. Also, the electricity generated at both ends of the lamp
Zener diode transistor → Tr1 base by pressure
Current flows and the transistor Tr1 turns on. As a result, the collector of the transistor Tr1 → resistor R8 → resistor R
9. The base of the transistor Tr2 and the current flow to turn on the transistor Tr2. When the transistor Tr2 is turned on, the gate of the MOSFET is gated and the MOSFET is turned on.
T turns off. When the voltage generated across the lamp becomes lower than the voltage of VBE of transistor Tr1 + voltage of Zener diode DZ2, transistors Tr1 and Tr2 turn off and MOSFE
T turns on. By repeating the above, the lamp L voltage is controlled to be constant. Also, during the positive cycle of the voltage of the coil 1, the zener diode is connected by the capacitor C2.
Since the voltage DZ3 is applied to the gate of the MOSFET, the MOSFET is turned on in the reverse direction, and the voltage drop (loss) can be reduced.

Next, FIG. 5 shows an embodiment in which the circuit of FIG. 4 is partly simplified, in which the control switch element Tr2 is omitted and the control switch element Tr1 also has this function. Get the effect.

FIG. 6 shows another embodiment of the present invention, which is different from the above embodiment in that a P-channel type MOSFET is used as the MOSFET. Is played.

[0016]

As is apparent from the above description, according to the present invention, the battery voltage control and the AC load voltage control are independently controlled with respect to the output of the magneto coil, so that mutual stable control is possible. Therefore, the power supply efficiency is improved because the power is cut off (opened) to both loads without short-circuit consumption of surplus power. In particular, it is possible to perform PWM (pulse width control) during half-cycle output when AC power is not supplied to the battery, so efficient voltage control is possible for small AC loads or load fluctuations, and the generator itself is miniaturized. It has great practical effects such as contributing to

[Brief description of drawings]

FIG. 1 is a basic circuit of an embodiment of the present invention.

FIG. 2 is a basic circuit of an embodiment of the present invention.

FIG. 3 Conventional circuit

FIG. 4 is a circuit diagram (wiring diagram) of an embodiment of the present invention.

FIG. 5 is a circuit diagram (wiring diagram) of an embodiment of the present invention.

FIG. 6 is a circuit diagram (wiring diagram) of an embodiment of the present invention.

[Explanation of symbols]

1 generator coil S1 MOSFET S2 thyristor COT1 control circuit COT2 control circuit BATT battery L AC load (lamp) (1) Voltage detection circuit (2) Open control circuit C1 and C2 capacitors DZ1, DZ2, DZ3 Zener diode Tr1, Tr2 control switch element (transistor) D0 Parasitic diode D3, R4 diode for charging circuit, resistor

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) H02P 9/30 H02J 7/14 H02J 7/24

Claims (2)

(57) [Claims] 1. A battery is charged by the output of a generator coil of a generator.
Connected in series with the battery and the charging circuit of the battery
The switched switching element S2 and the battery voltage
Second control for outputting and controlling the switching element S2
Between the circuit and both terminals of the generator coil or an intermediate tap
In between, a field effect transistor D0 with a built-in parasitic diode
The field effect transistor D connected in series with an AC load
0 is the voltage between both terminals of the generator coil or AC load
It is controlled by the first control circuit which detects and controls the voltage.
And the first control circuit is connected to the generator coil.
And the negative half-wave output period, the field effect transistor gate
Holding circuit for holding a bias voltage and the generator coil
The voltage between terminals or the AC load voltage exceeds the specified voltage.
When the holding circuit is opened, the half-wave output of the generator coil
Control and the half-wave of opposite polarity of the generator coil.
When the power is applied, the field effect transistor D0 is in the gate bias state.
As a power supply to an AC load through a parasitic diode
Voltage control of generator characterized by having an open control circuit
Alignment circuit. 2. The open control circuit comprises a field effect transistor.
Between the gate and source of the star D0, the control switch element Tr
2 and the gate bias voltage holding capacitor C2
Connected to the column, the voltage between the terminals of the generator coil or AC negative
When the load voltage reaches a predetermined value, the control switch element Tr2
Conducts, and the capacitor is short-circuited, and the gate bias voltage is
The pressure is released so as to release the pressure.
The voltage regulator circuit of the described generator.