JPS62268327A - Automotive high voltage 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] [Industrial Application] The present invention relates to a control device for a generator, which is an electrical component of an automobile engine, and is particularly suitable for operating a quick heater for defrosting a front windshield. It relates to a high voltage generator.

[Prior Art] Automobiles are equipped with various electrical components, and their power source is a battery (storage battery), which is charged by a generator driven by the engine. It is designed to be used while

In conventional automobiles, the rated operating voltage of the various electrical components installed therein is determined by the voltage of the battery, for example +2V DC, and this cannot be changed arbitrarily. There wasn't.

[Problem that the invention seeks to solve]

By the way, in recent years, such relatively low pressure ff1ilJ
Operates with 2 voltages - General fl! In addition to devices, various electrical components have been proposed that can operate at higher voltages to achieve better performance and help ensure the safety of automobiles. An example of such electrical equipment is a defrost quick heater built into the windshield.

Here is a practical example of this quick heater.
Automotive Engineering Magazine October 1985 issue, page 38
inieering, 0cjober, 1985 PP
38), and according to it, a quick heater consisting of
It has been reported that by supplying a certain amount of current, sufficient results can be obtained in 2 to 3 minutes even in severe winter conditions.

Therefore, it can be said that it is extremely desirable to equip ordinary automobiles with such electrical components, but conventional automobile power supplies do not give any particular consideration to the generation of such high voltages. Therefore, there was a problem in that it was not possible to equip electrical equipment with excellent performance such as a quick heater.

An object of the present invention is to sufficiently address the problems of the prior art described above, and to enable any vehicle to be easily equipped with electrical components such as quick heaters that operate at high voltage and exhibit excellent performance. To easily provide a high voltage generator for an automobile.

[Means for solving problems]

According to the present invention, the above object is to temporarily disconnect a generator driven by an engine from a battery, so that the output voltage of the generator can be controlled independently of the battery voltage. achieved. .

[For production]

Generators for automobiles are separately excited type, so if the output is separated from the battery, it is possible to generate a considerably high voltage by controlling the increase in field am current, which can be used for quick heaters, etc. Even high-voltage electrical equipment can be operated satisfactorily.

〔Example〕

Regarding the high voltage generator for automobiles according to the present invention,
This will be explained in detail with reference to the illustrated embodiment.6 Figure 1 shows one embodiment of the present invention.In Figure 1, 1 represents the entire generator;
1 is the armature coil.

12 is a voltage regulator, 13 is a field coil, 14 is a diode bridge, 4 is a key switch, 5 is a quick heater heating element, 6 is a defrost switch, 7 is a battery, 8 is a relay (relay), 9 is a Idle up solenoid, and 1o is a timer circuit.

The source side 1 is driven by an engine (not shown) and generates a DC voltage at a terminal B via a diode bridge 14. The voltage at terminal B is then taken into the voltage regulator 12, divided by resistors 2.2, 2.203. Field coil 13
is controlled so that the output voltage of the generator 1, that is, the terminal I
A voltage of 3 is suitable for charging the battery 7, e.g.
4V voltage c or less, this voltage is referred to as the first set voltage)
so that it is maintained. Each time the voltage regulation function is performed.

The quick heater 5 is a resistor made of a semiconductor layer formed in the laminated layer of the windshield made of laminated glass, and is normally operated by the voltage of the battery 7 to warm the windshield and prevent the formation of frost. However, when frost has already formed on the windshield before the engine starts, such as early in the morning during a cold season, a voltage higher than the first set voltage, for example 60V (hereinafter referred to as this voltage) is set. This voltage is referred to as a second set voltage), thereby rapidly heating the windshield so that defrosting can be completed in a medium amount of time.

The relay 8 is of a normally closed contact type, and is controlled by the output OUT of the timer circuit 10, and functions to disconnect the battery 7 from the output of the generator 1.

Idle up solenoid 9 is the same as relay 8.
It is controlled by the output OUT of the timer circuit 10, and functions to increase the idle speed of an engine (not shown) by a predetermined value.

The timer circuit 10 starts a timer operation at the same time as the defrosting switch 6 is turned on, generates an output out, and operates to extinguish the output after a predetermined period of time has elapsed.

FIG. 2 shows details of the timer circuit 10.
is a temperature sensor, 102 is an integration circuit, 1o3 is an output circuit,
104 is a comparison circuit, 105 is a resistor for voltage division, 106 is a resistor for voltage control, +07 is a Zener diode for voltage stabilization, and TH represents a thermistor.

Next, the operation of this timer circuit 10 will be explained.

When the switch 6 shown in FIG. 1 is closed, the output voltage of the generator l is applied to the input terminal I n of FIG. be applied to the temperature sensor 101. As a result, the voltage v1 at the connection point between the resistor +05 and thermistor TH of the temperature sensor 101 is as shown in FIG.
It changes according to the ambient temperature T'', and as the temperature [T] decreases, the voltage V] becomes -(2).

On the other hand, the integrating circuit 102 directly divides the voltage at the input terminal In with the resistors 12+ and 122, and divides this voltage into the diode 1.
25 to a low-pass filter consisting of a resistor 123 and a capacitor 124, and is integrated to generate an output voltage V,+. The second voltage ■- is the fourth
As shown in the figure, the value changes with the passage of time, and when the switch 6 is closed, zero increases from 18= to 18=, and eventually saturates.

Comparison circuit 104 compares these voltages V] and V2, and outputs the comparison result from output circuit 103 to output out. That is, if the relationship between the voltages Vl and v2 is V1<Vz, then the comparator circuit 1
The output of 04 is low level.

Therefore, the transistors 131 and 132 are cut off and the output out is released, and when Vl>V2, the output of the comparator circuit 104 is at a high level, so the transistors 131 and 132 are conductive, and a voltage is generated at the output out. . Therefore, the voltage v1 in FIG. 3 and the voltage V in FIG. 4, ! As is clear from the characteristics of this output circuit +03
As shown in FIG. 5, the generation time from the output out- changes depending on the ambient temperature, and as the ambient temperature decreases, a voltage is generated for a longer time.

Therefore, returning to FIG. 1, the operation of this embodiment will be explained.

When the key switch 4 is closed and the engine rotates, the generator 1 starts generating electricity, and the battery 7 comes to be charged.

Here, when the defrost switch 6 is closed, the quick heater 5 starts to be energized and the timer circuit 10 starts to operate, generating a voltage at its output OUT, which causes the relay 8 to operate and drain the battery 7. Disconnect from generator 1,
Additionally, the idle up solenoid 9 operates to increase the engine speed. In addition, in parallel with this, the output OUT of the timer circuit 10 is also supplied to the transistor 201 of the voltage adjustment Mi=+2, which makes the transistor 201 conductive and short-circuits the resistor 204. As a result, this voltage The output voltage of the Jl!flt machine 1, which is being adjusted by the J11 device 12, increases, and a second voltage higher than the first set voltage is supplied to the quick heater 5. It can exert a powerful defrosting effect.

Then, when a time determined by the timer circuit 10 according to the characteristics shown in FIG. The solenoid 9 returns to its inoperative state, and the transistor 201 also returns to its cut-off state. And this result.

The battery 7 is connected to the generator 1, and the generated voltage is returned to the first set voltage suitable for charging the battery 7, and the normal operating state is entered, and the first set voltage is applied to the quick heater 5. J, and automatically shifts to an operating state that suppresses frost formation.

Here, the adjustment operation of the first set voltage and the second set voltage by the voltage regulator 12 will be explained.

First, when the C terminal of the voltage regulator 12 is open, that is, the voltage at the output OUT of the timer circuit IO is zero, 1-
Because transistor 201 is blocking it.

The voltage at point D is determined by a voltage divider circuit made up of resistors 202, 203, and 204, and therefore the voltage at point B at this time, that is, the first set voltage V b x is as follows.

Vb1=(Vz+Vbe)・(1+R2
02/ (R203+R2o4))...(1) Here, v: Zener voltage Vbe of Zener diode 205: Base-emitter voltage R of h transistor 206,...: Resistance $202 (7) Resistance value R2゜3: Resistance value of resistor 203 R2oa: Resistance value of resistor 204 Next, when a voltage is applied to the C terminal, that is, when a voltage is generated at the output OUT of the timer circuit 10, the transistor 201 is conductive, at this time, the voltage dividing circuit that generates the voltage at point D is only resistors 202 and 203. Therefore, the voltage at point B at this time, that is, the second set voltage Vbr is (1 ) in the formula R21,j=
o and oite, it will be as follows.

V b 2 = (Vz +Vbe) ・(1+R2゜♂/R2,9) ・・・・・・ (2) These (1)
As is clear from the equation and equation (2), the voltage Vbz is larger than the voltage Vbz, and a high voltage can be supplied to the quick heater 5 only while the timer circuit 10 is generating the output out. can.

At this time, the battery 7 is disconnected by the relay 8, so even if the generator 1 generates a high voltage, there is no risk that the battery 7 will be overcharged, and the high voltage can be safely transferred. can be generated.

Further, according to this embodiment, due to the characteristics of the timer circuit 10, as shown in FIG. 5, the lower the ambient temperature is, the longer the high voltage is generated.

A sufficient effect of defrosting the windshield can be obtained, and defrosting can be completed in a short time.

Next, two other embodiments of the present invention will be described. In the twelfth embodiment, most of the components are integrated into the generator, and therefore a relay is used to disconnect the battery from the generator. Instead, SCfζ (thyristor) is used, and this SCR is shared with a part of the diode for converting the output of the generator into DC.

In FIG. 6, 15 is an SCR group, 100 is a timer circuit, and this timer circuit 100 is constructed integrally with the generator 1a, and the rest is the same as the embodiment shown in FIG. 1.

FIG. 7 is a detailed circuit diagram of the timer circuit lOO, and the second
The difference from the embodiment shown in the figure is that the output circuit 103 is removed and is replaced with diodes 131-133, 151-153, resistors 141-143, 171, and a resistor 1.
70, an SCR trigger circuit is provided.

When the output of the comparator circuit 104 is at a low level, the transistor 170 is cut off, so each S of the SCR group 15
CR gates Gl, G2. G3 has a resistance of $141.14
2.143 and diodes 131°132.133 to the anodes P1. P2. II)3
Since the SCRs of Niku et al. are all conductive, therefore, at this time.

The battery 7 is connected to the generator 4 Also, when the output of the comparator circuit 104 is at a high level, the transistor 170 is in a conductive state, so at this time, each S
The current from the anodes pt, p2, and P3 of CR is connected to resistors 141, 142.143, and diodes 151.15
2.153 and to ground through transistor 170, both of these SCRs remain cut off.

Therefore, in this embodiment, as in the embodiment shown in FIG. 1, each SCR of the SCR group 15 is cut off from when the switch 6 is turned on until a predetermined time determined by the ambient temperature has elapsed. As it is, the battery 7 is disconnected from the generator, and at this time, the transistor 201 is turned on by the output of the timer circuit IO, so the power generation Ia1
The generated voltage a becomes a high-voltage second set voltage and is supplied to the quick heater 5, so that rapid defrosting can be performed. Then, when a predetermined time has elapsed, the timer circuit 1
The output of ()0 disappears, which causes transistor 2
01 is cut off, and the voltage at the I terminal of the generator 1a becomes the first set voltage, which is the voltage 1-ii of the battery 7. At the same time, each S (: R of the SCR group 15 becomes conductive, so that the battery 7 is connected to a generator to ensure proper charging status.

Therefore, according to this embodiment, high reliability can be easily obtained since a switching means using a contact point such as a relay is not used, and most of the components can be integrated into an integrated circuit. Therefore, these components can also be built into the generator 1a, and the configuration can be sufficiently simplified and the wiring can be rationalized.

〔Effect of the invention〕

As explained above, according to the present invention, a specific electric load can be handled differently. Since the necessary high voltage can be stably supplied regardless of the voltage of the battery, it fully addresses the problems of the conventional technology, does not require the installation of a special high voltage power supply, and prevents overcharging of the battery. It is possible to provide a high voltage generator at low cost, which allows an automobile to be easily equipped with an electrical component such as a quick heater that exhibits high performance by operating at high voltage without any fear.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing an embodiment of a high voltage generator for automobiles according to the present invention, Fig. 2 is a circuit diagram showing details of a timer circuit, Fig. 3 is a characteristic curve diagram of a temperature sensor, and Fig. 4 is a circuit diagram showing details of a timer circuit. Figure 5 is a characteristic curve diagram of the timer circuit, Figure 6 is a circuit diagram showing one embodiment of the present invention, 7th is a circuit diagram showing another embodiment of the timer circuit. The diagram is: 1... Generator, 4... Keisui') child, 5...
・ ・Quick heater (heating element), b... 4i Torikawa's su (Tsuchi, 7... Battery, 8... Relay, 9... A- (Dollar up Tsu) / Noid, 10・
...Timer circuit, 11...Electric+'&f2+
-(Le, 12...Voltage 111111I, I3...
field coil.

Claims (1)

[Claims] 1. A separately excited generator driven by an engine, and a voltage regulator that controls the field current of this generator to adjust its output voltage to a predetermined first set voltage; A power supply device for an automobile comprising a storage battery charged by the generator, further comprising a switch means for disconnecting a connection path between the generator and the storage battery, and a switch means for controlling a set voltage of the voltage regulator to control the voltage of the generator. voltage control means for adjusting the output voltage of the generator to a second set voltage higher than the first set voltage, and by operating both the switch means and the voltage control means simultaneously, A high voltage generator for an automobile, characterized in that it is configured to supply the second set voltage to an electrical load. 2. In claim 1, the switch means and the voltage control means are configured to be controlled by a timer means activated by the start of energization to the specific electric load. A high voltage generator for automobiles featuring: 3. The high voltage generator for an automobile according to claim 1, wherein the switch means is constituted by a relay. 4. In claim 1, the generator is an alternating current generator, and at least one of the rectifier elements for converting the output of the alternator to direct current is replaced with a thyristor group. A high voltage generator for an automobile, characterized in that the switch means is constituted by this thyristor group. 5. A high voltage generator for an automobile according to claim 2, characterized in that the operating time of the timer means is controlled by ambient temperature. 6. The high voltage generator for an automobile according to claim 5, wherein the specific electric load is a quick heater for defrosting a front windshield. 7. In claim 5, the timer means includes an integrating circuit that time-integrates the voltage applied from the generator to the electrical load, and a temperature detection circuit that generates a signal representing ambient temperature. A high voltage generator for an automobile, characterized in that it is configured to generate a timer output by comparing the output voltages of these two circuits. 8. The high voltage generator for an automobile according to claim 2, wherein the output of the timer means is also supplied to an operation input of an idle-up mechanism of the engine.