JPS59220032A - Control circuit for charging generator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention controls the output magnetic pressure of a charging generator driven by an inner box engine or the like to a predetermined value, and also controls the output magnetic pressure of a charging generator to a predetermined value or less. ? The standard relates to a charging generator with a drive switching circuit that switches energization between the charge indicator light and the load connected in series, and a control circuit, particularly at the connection point between the charge indicator light and the load or the power generator The purpose is to protect the second rectified output end of the machine from a ground fault.

First, a conventional device of this type will be explained with reference to FIG.

In the figure, +11 is a three-phase AC generator installed in a vehicle (not shown) and driven by an engine (not shown), which connects an armature coil (101) and a field coil (102) connected in a three-phase star pattern. have. (2) is a full-wave rectifier that full-wave rectifies the AC output of the generator tl+, (201) (
202) (goa) are Ol and 2nd regular L no 1, respectively.
1; Output end and ground end, +31 is the above field coil (102
) by controlling the field current flowing through the
This pressure adjustment device controls the gm output voltage to a predetermined value, and is composed of the following parts.

That is, (301) is a surge absorbing quaiode connected to both ends of the field coil (102), (802) (
803) is a Darlington-connected output transistor (80
4) is a resistor that constitutes the pace circuit of the transistor (8'02) (808), and (805) is a resistor 1- that controls on/off the transistor (so2) C80B).
The j control transistor (aoe) is a zener diode (807) that detects the voltage at the second firefly output terminal (12) of the power generator 4JAm and becomes conductive when this output voltage reaches a predetermined value. (+083 are resistors connected in series with each other and forming a voltage dividing circuit for the second rectified output @(202) voltage.

+417d storage battery, (5) is the key switch, (6) is the charging indicator, (7) is the load, (8) is the commonly used oscillation circuit, (9) is the switching circuit, and the generator tl+
The initial excitation current to the field coil (i02) at the time of startup is set. The component configuration is as follows.

That is, (901) is a switching transistor that controls the initial excitation current on and off, (902) is a backflow blocking diode during power generation, and (908) is the switching transistor (90).
The resistor (904) that constitutes the pace circuit of 1) is the switching transistor (901) fully turned on from the oscillator (8);
Use a diode to control off.

(1 is the drive switching circuit, which is composed of the following parts. (110) (111) is the charging indicator light (6)
The Darlington-connected driving transistor that drives the transistor, (112) ff The resistor that constitutes the pace circuit of the transistor, (ll'l) (114) is the upper 6 transistor! Drive transistor (110) (Ill
) is made conductive when it is non-conductive, and supplies current to the load (7)! [llll transistor, (115) is the second
The resistor Hle) which defines the base current of the transistors (118) and (114) is a switching transistor (117) which is conductive at a voltage equal to or higher than a second predetermined value which defines the ignition state at a voltage equal to or greater than the first predetermined value. ) is a diode that blocks the conduction of electricity to the resistor (115) when the switching transistor (lie) is 1JM; (118) is connected to the base terminal of the switching transistor (116);
When the rectified output terminal (202) voltage is equal to or higher than a second predetermined value, the zener diode becomes conductive, and the resistor defines the current that flows when the calyx of the (119) I-iaA Zeppu diode (118) passes.

Next, a previous version of the device configured as described above will be described.

First, when the key switch (5) is closed when starting the engine, the transistor (8 (12) C3
A pace current flows through the transistor (802).
(8o3) is conductive. The transistor (80J (80
8) becomes conductive, the key switch (
5), Ichikan transistor (901), diode (90
2), -Wla coat /l/ (1o2), through the transistor C802) (81[), the field coil (
102), a field current flows and a field magnetomotive force is generated.

At this time, the opening/closing transistor (901) is connected to the oscillation circuit (8
), it is always on through the diode (909),
Off controlled. FIG. 3 shows the oscillation waveform output from the oscillation circuit, and FIG. 4 shows the initial excitation current waveform supplied to the field coil (102).

In the figure, the field current increases sequentially when the switching transistor (901) is on due to the influence of the inductance of the field coil (11), and when it is off, the field current increases due to the influence of the inductance of the field coil (11).
301). The average ll#1 of the field current is set by the oscillation circuit (8), and initial excitation is performed.

When the machine opening is started in this state and the generator tl+ is driven, an AC output is induced in the Kaiisogo coil (101) according to its rotation speed, and this output is full-wave rectified by the full-wave rectifier +21. Ru. Here, when the pot outflow output is below the first predetermined value, the voltage dividing point potential of the voltage dividing circuit constituted by the resistors (307) and (808) is still low, so the zener diode (
ao6) does not reach a conductive state and maintains a non-conductive state, and the supply of field current is maintained, thereby causing the generator I
The output voltage of ll increases as the rotational speed increases. After that, if the rotational speed of the generator il+ further increases and the output voltage exceeds the predetermined value of the voltage divider circuit, the voltage dividing point potential of the voltage dividing circuit will also become high.
1■JL, Base current is supplied to the transistor (805) through the Zener diode (SOa),
Transistor (805) becomes conductive. The transistor (
When transistor (802) <8
03) I"ii cutoff The current I"ii flowing through the field coil (102) is cut off, and the output voltage of the generator (1) decreases. When this output voltage drops to a predetermined value, the Zener diode (808) and the transistor (805) become non-conductive again, and the transistor (802) (11(
Ll13 is conductive and the field coil (1023 is energized,
The output voltage of generator ti+ rises again. By repeating the above-mentioned operation, the output voltage of the generator +11 is controlled to the predetermined value of the generator +11, and at this controlled voltage, the storage battery (4
).

Here, the operation of the drive switching circuit (11) will be described as follows. Second rectified output Ivil (2021
When the generator 111 starts up, the tonic pressure is less than the second predetermined value, so the Zener diode (118) and the switching transistor (116) are in a cut-off state.

As a result, the transistor (118) (114
Since no current is supplied to the base of transistor 1, it is in a cut-off state, and drive transistor 1 (110) (Ill) is supplied with base current through the resistor (112) and is turned on exclusively.

The charge indicator light (6) is driven by the conduction of the drive transistor (110) (ill)! and lights up. Next, when the output voltage of the generator tl+ is controlled to a predetermined value, the zener diode (118) and the switching transistor (l16) are dedicated to The second drive transistor (118) (l14) is cut off and the resistor (115)
A pace' current is supplied through the conductor. As a result, the charging indicator light (6) is turned off and the load (7) is energized via the second drive transistor (1181 (114)).

However, in the above conventional device,
When point A in FIG. 1 is grounded while the output voltage of Drive transistor (113) (114)
There was a risk of damage due to excessive current flowing through the device. Also, B.J.
, or grounded, there was a danger that the switching transistor (9) would be destroyed.

The present invention provides an excellent charging generator control circuit that eliminates the above-mentioned drawbacks. An embodiment of the present invention shown in FIG. 2 will be described below. In FIG. 2, 0 is a protection circuit, which is composed of the following parts. That is, (1203 is a Zener diode that constitutes the power supply for the protection circuit 0, (121) is the Zener diode (120)
(12g) is a current detection shunt that detects the current flowing through the key switch (5), (128) is a detection transistor that is driven when overcurrent is detected, 12!4) is a capacitor (125) charged via the detection transistor (lza)' when an overcurrent is detected.
(124) Resistance that defines the heno charging current, (126
) is the discharge resistance of the above capacitor (1g4), (127
) is a comparator that conducts the output when overcurrent is detected, (1
2s) h29) (180) (181) constitutes a hysteresis circuit and sets the comparison voltage of the comparator (127) with respect to the charging voltage of the capacitor (ig4), (182) n upper e comparator (127)
When the switching transistor (116) (i, 1
This is the quiode of iii.

(13i9) l-j Same as above, open/close transistor (
901) (f'' is the second diode that cuts off.

In the embodiment device configured as described above, the α generator i
The output voltage of 11 is controlled to a predetermined value of the load (7).
is energized through the second transistors (113) (114), and if point A in FIG. 2 is completely grounded or grounded through a resistor, the second drive transistor (118) ( 114), an excessive current flows through it. Moreover, when the point B is grounded, the control transistor (9
01), an excessive current flows. When the overcurrent exceeds the predetermined value of O8 that defines overcurrent, the current detection shunt (
122) The voltage across both ends becomes greater than or equal to the base-emitter voltage of the detection transistor (12'+3), and the transistor (
i2a) I″ii conduction. As a result, the capacitor (12
4) is a detection transistor (123) as shown in FIG.
, and are charged via the resistor (125). Here, the voltage at point D of the non-inverting input (→ terminal) of the comparator (127) is
During normal operation, the resistance (129) for the parallel combined resistance value of the series combined resistance of resistance (1803 (1811) and resistance (IH))
The fourth predetermined value is determined by the ratio of .

When the charging voltage of the capacitor (xg4) is charged below the fourth predetermined value, the comparator (u7) becomes conductive as shown in the OFF diagram, and the switching transistor (116) becomes a diode (18J f). By cutting off the switching transistor (116), the second drive transistors (118) (114) are no longer supplied with pace current and are cut off.
) is also blocked via the second diode (138).

As a result, the voltage across the current detection shunt (1221) becomes zero because there is no current, and the voltage across the current detection shunt (1221) becomes zero due to the lack of current.
) is also cut off, and the capacitor (ig4) is slowly discharged through the resistor (126), as shown in FIG.

At this time, the non-inverting input (-1-
Since the output of the comparator (li) is conductive, the voltage at point D of terminal 1 is determined by the resistance (128) and the resistance (129) (
The fifth predetermined value is less than or equal to the fourth predetermined value determined by the ratio with the parallel combined resistance of In).
The output of the comparator hg71) maintains the conductive state until the pancreatic pressure is discharged to below the fifth predetermined value.

When the direct voltage at the terminal of the capacitor (124) becomes equal to or lower than the fifth predetermined value, the output of the comparator (x273) is cut off and the second drive transistor (118) (
114) becomes conductive again, but as shown in FIG. 5, if an overcurrent exceeding the predetermined value of O8 flows again, the above-mentioned cutoff operation is repeated.

As described above, in the device of the present invention, the second drive transistors (118) (114) conduct and the load (
A fault occurs when both ends of the load (7) are completely short-circuited or short-circuited through a resistor while the power is energized, or the second rectified output end (
If an excessive current exceeding a predetermined value of the current detection shunt (122) flows through the grounding terminal (202), the second driving transistor (202) 118) (114) E, 1: This has the effect of preventing damage to the U switching transistor c9ol).

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram showing a conventional device, Fig. 2 is an electric circuit diagram showing an example of this system, Fig. 3 is an output waveform diagram of the oscillation circuit, and Fig. 4 is a supply to the field coil. Figure 5 is a waveform diagram of the initial excitation current flowing through the key switch (5) to the current detection shunt (1g2);
The figure is a terminal voltage waveform diagram of conte/f' (124), and the OFF diagram is an output terminal voltage waveform diagram of the comparator (1137). In the figure, (1j is an AC generator, 121 is a full-wave rectifier, (3) is a voltage regulator, (4) is a storage battery, (5) is a key switch, (6) is a charging indicator, and (7) is load,(
8) is an oscillation circuit, (9) is an opening/closing circuit, (1 is a drive switching circuit, and (121 is a protection circuit. In the figures, the same reference numerals indicate the same or equivalent parts. Agent: Ida Masuo Oiwa a Amendment (spontaneous) !i15'1-Director-General 1 Indication of matter a'1 Mochi1 Sekisho 58-9268
No. 2 No. 2, Title of the invention: Charging power generation n control circuit 3, Person making the amendment, Representative Kata Yuhito, Detailed description of the invention in the specification, and drawings. 6. Contents of amendment (1) [Diode (909)] on page 6, line 14 of the specification
Correct J to 1 diode (904) J. (2) The reference numeral 181 in Figure 2 of the drawings has been corrected to 181 as shown in the attached sheet. 7 At least one copy of the revised catalog drawings of attached documents (Figure 2)

Claims (1)

[Claims] An alternating current generator with a Qiqizi coil and a field coil, rectifying the alternating current output of the generator, a rectifying device having a second false output end and a grounding end, and an original rectifying output of the rectifying device. By controlling the storage battery charged by the output of the end, the field coil excited by the output of the fan 2 rectified output end of the current device, and the field current flowing through the field coil, the generator a voltage regulating device for controlling the output voltage of the circuit to a predetermined value, a switching circuit having a switching transistor inserted in series between the rectified output terminal of the coil 2 and the storage battery via a key switch, and the switching transistor; an oscillation circuit for controlling on and off the charging indicator lamp and the load connected in series between the crystal battery and the ground via the key switch; a second drive transistor for driving a charge indicator lamp that shuts off when a predetermined value is exceeded; and a second drive transistor for driving a load that conducts the load when the second predetermined value is exceeded; ．． A switching circuit includes a switching transistor that switches the operation of the second driving transistor, a direct U torque detection shunt that detects the current flowing through the key switch, and a current flowing into the shunt when the current flows to the shunt reaches a predetermined value. A detection transistor that becomes conductive when the voltage exceeds the limit, a capacitor that is charged when the detection transistor becomes conductive, and a resistor that constitutes a circuit for the capacitor.
When the charging voltage to the capacitor and the capacitor exceeds a predetermined value of 11 μm, the second drive transistor and the upper &! Aiso for charging, characterized by a comparator circuit that has a hysteresis characteristic that drives the transistor in the direction of blocking it! j control circuit.