JPH047678Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a power generation device for a vehicle.

Generally, alternating current generators for vehicles such as automobiles are
During operation, the power generating device is driven by an internal combustion engine, and thereby has the function of generating a charging current to be applied to a power storage device mounted on a vehicle or the like. Such a power generation device for a vehicle can obtain an adequate output current, that is, a charging current, even when the internal combustion engine is rotating at a relatively low speed, and can obtain a suitable output current, that is, a charging current, even when the internal combustion engine is rotating at a relatively low speed, and when the internal combustion engine is rotating at a high speed. , a higher output current is preferably obtained.

The present invention is based on the above-mentioned requirements and aims to provide a novel power generation device for vehicles that is small and has high output.

The invention will be described below with reference to illustrated embodiments.

FIG. 1 shows a specific circuit of the power generation device according to the present invention.

A power generation device 1 for a vehicle includes an armature winding 2 of an alternating current generator that is Y-connected, a full-wave rectifier circuit 3 connected to the armature winding, and an electric generator of the alternating current generator that is also Y-connected. It is composed of a child winding 4 and a full-wave rectifier circuit 5 connected to the armature winding. Furthermore, the power generation device 1 includes diodes D ₁₃ and D ₁₄ , a thyristor SCR,
A field winding 6 of an alternating current generator is provided. The diodes D ₁₃ and D ₁₄ allow the parallel connection of the full-wave rectifier circuits 3 and 5, so that the cathode of the diode D ₁₃ , together with the output terminal A, connects the cathodes of the diodes D ₇ to D ₉ of the full-wave rectifier circuit 5. It is connected to the common connection point (positive output of the full-wave rectifier circuit 5), and the anode of the diode _D13 is connected to the diodes D1 to _D3 of the full-wave rectifier circuit _3.
is connected to the common connection point of the cathodes (positive output of the full-wave rectifier circuit 3). Further, the cathode of the diode D ₁₄ is connected to the common connection point of the anodes of the diodes D ₁₀ to D ₁₂ of the full-wave rectifier circuit 5 (negative output of the full-wave rectifier circuit 5), and the anode of the diode D ₁₄ is
Along with output terminal B, the diode of the full wave rectifier circuit
It is connected to the common connection point of the anodes of D ₄ to _{D 6} (negative output of the full-wave rectifier circuit 3). Thyristor SCR is
It is a switching element that functions to allow series connection of full-wave rectifier circuits 3 and 5, and is a thyristor.
The anode of the SCR is connected to a common connection point of the cathodes of diodes D ₁ to _{D 3} of the full-wave rectifier circuit 3,
Its cathode is the diode of the full-wave rectifier circuit 5.
connected to the common connection point of the anodes of D ₁₀ ~ _{D 12} ,
Its gate is connected to control input terminal C. Further, a voltage regulator 7, a capacitor 8, and a load resistor 9 are connected in parallel between output terminals A and B of the power generation device 1.

In the above configuration, a part of the voltage of the capacitor 8 is applied to the input terminal D at the same time as the internal combustion engine (not shown) is started, and an exciting current flows through the field winding 6, so that the armature winding 2 and 4 are each energized and start generating electricity.

Now, if the thyristor SCR is in a conductive state,
As mentioned above, the full-wave rectifier circuits 3 and 5 are connected in series, and the internal combustion As the rotational speed of the engine increases, the output current changes as shown by the curve ABC. On the other hand, when the thyristor SCR is in the non-conducting state, the full-wave rectifier circuits 3 and 5 are connected in parallel by the diodes _D13 and _D14 , and the output current follows the curve dbe as the rotational speed of the internal combustion engine increases. It changes like this.
Therefore, as is clear from the characteristic curve in Figure 2,
At low speeds, the output current rises faster in the series connection state than in the parallel connection state, and at high speeds, a higher output current can be obtained in the parallel connection state than in the series connection state. In view of these characteristics, the present invention attempts to obtain the characteristic curve abe.

Specifically, at the same time as the internal combustion engine starts, a gate control current is applied to the gate of the thyristor SCR via the control input terminal C to turn the thyristor SCR into a conductive state. The gate control current is output from a suitable rotational speed detection circuit (not shown) that monitors the rotational speed of the internal combustion engine. Next, when the rotational speed of the internal combustion engine reaches a preset speed P, the input of the gate control current is stopped and the field winding is controlled by the voltage regulator 7 to make the anode of the thyristor SCR negative with respect to the cathode. The supply of excitation current to the line 6 is temporarily stopped to stop power generation, or a reverse voltage is applied to the thyristor SCR, thereby rendering the thyristor SCR in a non-conducting state. Therefore, the full-wave rectifier circuits 3 and 5 are connected in series in a low-speed operating state from when the internal combustion engine starts until the rotational speed reaches P, and the full-wave rectifier circuit 3 is connected in series in a high-speed operating state exceeding the rotational speed P. and 5 are connected in parallel.
As a result, as the rotational speed of the internal combustion engine increases,
As shown in FIG. 2, the output current changes as shown by the curve abe. Note that the output current is supplied to the capacitor 8 as a charging current.

As described above, according to the present invention, it is possible to provide a power generation device for a vehicle that has a simple configuration and can rapidly generate output during low-speed operation and obtain high output during high-speed operation. In addition, in the illustrated embodiment,
Although a thyristor SCR is used as a switching element, a relay device or a transistor may be used instead.

[Brief explanation of the drawing]

FIG. 1 is a specific circuit diagram showing an embodiment of the present invention. FIG. 2 is a characteristic curve diagram showing the relationship between the rotational speed of the internal combustion engine and the output current of the power generator. Explanation of symbols, 1... Generator, 2, 4... Armature winding, 3, 5... Full wave rectifier circuit, 6... Field winding, 7... Voltage regulator, 8... Condenser, 9...Load resistance, _D1 to _D14 ...Diode, SCR...Thyristor, A, B...Output terminal, C...Control input terminal, D...Input terminal.

Claims (1)

[Claims for Utility Model Registration] 1. The first and second
an alternator equipped with armature windings 2 and 4, and first and second full-wave rectifier circuits 3 and 5 that provide rectified outputs of the generated outputs of the first and second armature windings, respectively. , first and second diodes
D ₁₃ , D ₁₄ and a switching element SCR, the first diode D ₁₃ has an anode connected to the positive output side of the first full-wave rectifier circuit 3, and a cathode connected to the positive output side of the first full-wave rectifier circuit 3. The second diode _D14 has an anode connected to the negative output side of the first full-wave rectifier circuit 3, and a cathode connected to the negative output side of the second full-wave rectifier circuit 3. It is connected to the negative output side of the full-wave rectifier circuit 5, and the positive output side of the second full-wave rectifier circuit 5 and the negative output side of the first full-wave rectifier circuit 3 are connected to external output terminals A and B, respectively. The switching element SCR is connected between the positive output side of the first full-wave rectifier circuit 3 and the negative output side of the second full-wave rectifier circuit 5, and is connected to the internal combustion engine at a preset rotational speed. A generator for a vehicle that is conductive during low-speed operation up to a preset rotational speed, and becomes non-conductive during high-speed operation exceeding a preset rotational speed. 2. The power generating device according to claim 1, wherein the switching element is a thyristor. 3. The power generation device according to claim 1, wherein the switching element is a transistor. 4. The power generation device according to claim 1, wherein the switching element is a relay device.