 Control device for the charging of at least one battery |
| The present invention seeks to overcome these drawbacks by using a control device that operates ... |
|
| Portable power supply incorporating a generator driven by an engine |
| Features of the present invention improve conventional engine-driven generators in portable power ... |
|
| Hardware modeling system and method of use |
| The present invention is an improved hardware modeling system and method of use. The hardware ... |
|
| Rechargeable battery protection circuit |
| The rechargeable battery protection circuit of the present invention is provided with a switching ... |
|
| Power control apparatus and method for a body implantable medical device |
| The present invention has certain objects. That is, various embodiments of the present invention ... |
|
| Spread spectrum communication system utilizing differential code shift keying |
| The present invention is a spread spectrum data communication system that utilizes a modulation ... |
|
| Voltage monitoring circuit for rechargeable battery |
| A voltage monitoring circuit and method for use in monitoring the voltage of a rechargeable battery ... |
|
| Adaptive per-pair skew compensation method for extended reach differential transmission |
| What is claimed is: 1. A differential transmission de-skew system comprising: a first delay block; ... |
|
| Time controlled battery charger |
| We claim as our invention: 1. In an on-board charger for an electric vehicle, the vehicle having a ... |
|
|
Battery protective circuit
| Details |
Inventors: Fujita, Hiroyuki; Inoue, Koichi;
Assignee: Rohm Co., Ltd. (Kyoto, JP)
Primary Examiner: Tso; Edward H.
Assistant Examiner:
Attorney, Agent or Firm: Nikaido, Marmelstein, Murray & Oram LLP
A battery protection circuit has an overcharge detection circuit that detects overcharge of a battery and a charge inhibition circuit that, when overcharge is detected, inhibits charging with a delay produced by a capacitance element. This charge inhibition circuit can detect a short circuit in the capacitance element that is used to produce a predetermined delay, and, when it detects a short circuit in the capacitance element, it inhibits charging without delay. Thus, since charging is inhibited even when the capacitance element is short-circuited, a power supply unit incorporating this battery protection circuit is safer to use. |
|
DETAILED DESCRIPTION We claim: 1.
A battery protection circuit that, on detecting overcharge of a battery, secures a delay by use of a capacitance element before inhibiting charging of the battery, comprising: means for detecting a short circuit in the capacitance element, wherein charging of the battery is inhibited when a short circuit is detected in the capacitance element.
2.
A battery protection circuit as claimed in claim 1, further comprising: means for applying a predetermined voltage to the capacitance element; means for detecting a voltage at the capacitance element; and means for inhibiting charging of the battery when the voltage at the capacitance element drops below the predetermined voltage.
3.
A battery protection circuit as claimed in claim 1, further comprising: an offset setting circuit for applying a predetermined voltage V.
sub.
2 to the capacitance element when overcharge is not detected; a capacitance element charging circuit for supplying the capacitance element with a predetermined current when overcharge is detected; first and second comparators that output a high level when a voltage at their first input terminal exceeds a voltage at their second input terminal; and an OR circuit that outputs a high level when either of the first and second comparators outputs a high level, wherein the first comparator receives, at its first input terminal, the voltage at the capacitance element and, at its second input terminal, a predetermined voltage V.
sub.
1, and the second comparator receives, at its first input terminal, a predetermined voltage V.
sub.
3 and, at its second input terminal, the voltage at the capacitance element, the predetermined voltages having a relation V.
sub.
1 >V.
sub.
2 >V.
sub.
3, and wherein charging of the battery is inhibited by a high level output from the OR circuit.
4.
A battery protection circuit as claimed in claim 3, wherein the offset setting circuit is realized by connecting the capacitance element to a node between a constant current source and a diode
|
| Related patents |
|
|
Battery pack charging apparatus and method
What is claimed is: 1. A charging apparatus for charging a plurality of detachable battery packs, said charging apparatus comprising: a charging device configured to ...
|
|
|
Gas turbine engine starter-generator exciter starting system and method including a capacitance circuit element
The present invention relates to a gas turbine engine starter-generator that, when operating as a motor, can generate torque that is sufficiently high to start an ...
|
|
|
Battery charger
WITH REFERENCE TO THE DRAWINGS In the following, if a voltage is stated at a particular point in a circuit, it is to be understood that such voltage is measured ...
|
|
|
Overvoltage and backflow current protection for a battery charger
OF THE EMBODIMENTS OF THE INVENTION The embodiments of the present invention may be practiced in a variety of settings that implement a power converter, such as a ...
|
|
|
Battery charge indicator
What is claimed is: 1. A battery charge monitoring means for deriving an indication of the state of charge of a defined type of battery, the monitoring means having: ...
|
|
|
Tamper resistant circuit boards
The present invention satisfies this need by means of a physical barrier that also functions as a tampering sensor or sensors monitored by electrical circuitry that ...
|
|
|
Auxiliary battery voltage/temperature compensation for automotive 12 volt system for electric vehicles
OF THE INVENTION Referring now to the drawings and more particularly to FIG. 1, shown thereat is an electrically powered motor vehicle 10 such as shown and described in ...
|
|
|
Device for and method of switching and monitoring batteries
It is an object of the present invention to switch between parallel-connected batteries when the battery in use dies. It is another object of the present invention to ...
|
|
|
Battery voltage measurement device
According to one aspect of the present invention, a battery voltage measurement device includes: a plurality of first switching sections, in which each pair of adjacent ...
|
|
|
Method for failure detection in a radio frequency device
OF THE PREFERRED EMBODIMENT It will be appreciated that for simplicity and clarity of illustration, elements shown in the figures have not necessarily been drawn to ...
|
|
|
Electrical and Wave 
