JPH0515060A - Portable booster power supply - Google Patents

Abstract

PURPOSE:To enable a vehicle to be started even if a vehicle battery voltage is dropped by inserting a booster circuit into a path which charges a large- capacity of a portable booster power supply. CONSTITUTION:When a switch 15 is turned on at a terminal 17, a switching circuit 14 initiates ON/OFF. At the same time, a transistor 12 is also turned on/off but current flows along a path, namely from a battery 1 though a reactor 13 to a transistor 12, while the transistor 12 is ON, thus enabling an electromagnetic energy to be accumulated at the reactor 13. When the transistor 12 is turned off, a high voltage is generated by an energy which is stored at the reactor 13. This voltage is transmitted to a capacitor 11 through a diode 10, thus turning into a smoothed high-voltage DC voltage. A large-capacity capacitor 6 is charged by this booster voltage so that it is charged to a voltage which is lower than that of the battery 1, an energy which is larger than before can be taken out, thus enabling a starter 3 to be started even if the voltage of the battery 1 is reduced.

Description

Detailed Description of the Invention [Industrial applications]

 The present invention relates to a portable booster power source which is used by being charged from a battery of a vehicle or the like.

[Prior Art]

 FIG. 2 shows a portable booster power source devised prior to the present invention, which is the premise of the present invention. In FIG. 2, 1 is a battery, 2 is a battery terminal, 3 is a starter, 4 is a generator, 5 is a starter switch, 6 is a large-capacity capacitor, 7 is a booster cable, 8 is a booster terminal, and E is a portable booster power supply. , F are circuits on the vehicle side. The portable booster power source E is configured by connecting a booster cable 7 with a booster terminal 8 to a large capacity capacitor 6. The large-capacity capacitor 6 is a capacitor that is small but has a large capacity in units of farad (eg, 10F to 150F). An example of such a capacitor is an electric double layer capacitor. The vehicle-side circuit F is well known, but its operation will be briefly described. When the stutter switch 5 is turned on, the voltage of the battery 1 is first applied to the C terminal of the starter 3. Then, the path in the starter 3 connected to the B terminal is also turned on, and the voltage of the battery 1 is applied via the B terminal. This starts the starter 3. When the engine starts to rotate by starting the starter 3, the generator 4 driven by the engine starts power generation. The generator 4 charges the battery 1 and also supplies electric power to an on-vehicle electric device (not shown). The portable booster power source E is used when the battery 1 is exhausted and the starter 3 cannot be started. The usage method is as follows. First, the starter switch 5 is turned off, and the booster terminal 8 is connected to the battery terminal 2. The large-capacity capacitor 6 is charged by the battery 1. Generally, the capacitor can be charged in an extremely short time as compared with the battery, and the large capacity capacitor 6 can be charged in a short time. Next, when the starter switch 5 is turned on, current is mainly supplied from the large-capacity capacitor 6 to the starter 3. This is because the internal resistance of the large-capacity capacitor 6 is much smaller than the internal resistance of the battery 1. Moreover, since this current is the discharge current of the capacitor, a large current is supplied in a short time. Since the starter 3 is a device that requires a large current for a short time, the manner of supplying the current as described above exactly matches the demand of the starter 3. Therefore, the starter 3 which has not been started by the battery 1 can be started by the portable booster power source E. The portable booster power source E was devised as having such characteristics.

[Problems to be Solved by the Invention]

 (Problem) However, in the above-mentioned portable booster power supply, charging stops when the charging voltage becomes equal to the voltage of the battery, so that the energy remaining in the battery cannot be fully utilized. There was a problem. (Explanation of Problems) As can be understood from the circuit of FIG. 2, the charging of the large-capacity capacitor 6 from the battery 1 is performed when the charging voltage of the large-capacity capacitor 6 becomes equal to the voltage of the battery 1. finish. If it comes to start the starter 3 with the charge, the portable booster power supply E will have fulfilled its mission and there will be no problem. However, if the voltage of the battery 1 is low, the charging of the large-capacity capacitor 6 ends abruptly, and the charging energy is small. Then, even if the starter switch 5 is turned on and the starter 3 is discharged, there are cases where the starter 3 cannot be started. An object of the present invention is to solve such a problem.

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, a portable booster power supply of the present invention includes a large-capacity capacitor, a switch for switching a charging path to the large-capacity capacitor and a discharging path from the large-capacity capacitor, and a charging path. It was equipped with an inserted booster circuit.

[Work]

 If a booster circuit is installed in the path that charges the large-capacity capacitor of the portable booster power supply, the energy taken out from the battery, which is the charging power supply, can be made larger than when not installed. , When using a portable booster power supply to start a vehicle starter, it is possible to extract sufficient energy to start even when the vehicle battery voltage drops significantly.

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a portable booster power source according to an embodiment of the present invention. The reference numerals correspond to those in FIG. 2, 9 and 10 are diodes, 11 is a capacitor, 12 is a transistor, 13 is a reactor, 14 is a switching circuit, 15 is a switch, 16 and 17 are terminals, and H is It is a booster circuit. In the portable booster power source E of the present invention, the charging path and the discharging path are separated, and the booster circuit H 1 is inserted in the charging path. The switch 15 is a switch for switching between the charging path and the discharging path. The transistor 12 is a transistor that is turned on / off by the switching circuit 14, and this and the reactor 13 boost the battery voltage. The switching circuit 14 is a circuit that performs switching when a voltage is applied. The diode 10 is for backflow prevention, and the capacitor 11 is for smoothing. The boosting operation is as follows. When the switch 15 is turned on to the terminal 17, the switching circuit 14 starts turning on and off. Along with this, the transistor 12 is also turned on and off, but while the transistor 12 is on, a current flows through the path of the battery 1 → reactor 13 → transistor 12, and electromagnetic energy is stored in the reactor 13. When the transistor 12 is on, the anode side of the diode 10 is at ground potential, so the diode 10 is off. When the transistor 12 is turned off, a high voltage is generated by the energy stored in the reactor 13. This voltage is transmitted to the capacitor 11 through the diode 10 and made into a high-voltage smoothed direct current. That is, a boosted voltage can be obtained. Since the large-capacity capacitor 6 is charged by this boosted voltage, it is charged to a voltage higher than the voltage of the battery 1. That is, more energy can be extracted from the battery 1 than in the conventional case. When the starter 3 is started by the portable booster power source E (that is, when the large-capacity capacitor 6 is discharged), the switch 15 is switched to the terminal 16. When the starter switch 5 is turned on, the discharge current flows through the diode 9 to the starter 3. Since the large-capacity capacitor 6 takes out more energy than before even when the voltage of the battery 1 is lowered, it is possible to supply a sufficient current for starting the starter 3.

【The invention's effect】

 As described above, according to the portable booster power supply of the present invention, the energy taken out from the battery or the like, which is the charging power supply, is larger than that of the conventional portable booster power supply in which the booster circuit is not inserted. You can Therefore, when the portable booster power source is used to start the vehicle starter, for example, even when the vehicle battery voltage is significantly reduced, it is possible to extract sufficient energy to start the vehicle.

[Brief description of drawings]

 FIG. 1 ... Portable booster power source according to an embodiment of the present invention FIG. 2 ... Portable booster power source which is a premise of the present invention In the drawing, 1 is a battery, 2 is a battery terminal, 3 is a starter, and 4 is Generator 5, 5 starter switch, 6 large capacity capacitor, 7 booster cable, 8 booster terminal, 9 and 10 diode, 11 capacitor, 12 transistor, 13 reactor, 14 switching circuit, 15 Is a switch, 16 and 17 are terminals, E is a portable booster power supply, F is a vehicle side circuit, and H is a booster circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihiro Shirata 8 Tsutana, Fujisawa City, Kanagawa Prefecture Isuzu Motors Ltd. Fujisawa Plant (72) Keiichi Iida 8th Shelf, Fujisawa City, Kanagawa Isuzu Motors Fujisawa Co., Ltd. Inside the factory (72) Inventor Takeshi Yoshizawa 8 Soil Shelf, Fujisawa City, Kanagawa Prefecture Isuzu Motors Ltd. Fujisawa Plant (72) Inventor Hiroyoshi Morohoshi 8th Shelf, Fujisawa City, Kanagawa Isuzu Motors Ltd. Fujisawa Plant (72) Inventor Hitoshi Sawada 8 Fujitasawa, Kanagawa Prefecture, Shentan 8 Isuzu Motors Co., Ltd., Fujisawa Factory (72) Inventor, Jota Sato 8s, Fujisawa, Kanagawa Kensou, Fujisawa Factory (72) Inventor, Kazutoshi Otani 8 Fujisawa, Kanagawa Prefecture

Claims (1)

Claim: What is claimed is: 1. A large capacity capacitor, a switch for switching between a charging path to the large capacity capacitor and a discharging path from the large capacity capacitor, and a booster circuit inserted in the charging path. A portable booster power supply characterized by that.