Current integrating value detection device and current detection device and battery adopting them
A technology of current detection resistors and detection devices, which is applied in the direction of measuring devices, measuring current/voltage, measuring electricity, etc., and can solve problems such as large influence and current detection errors
Inactive Publication Date: 2004-01-28
HITACHI LTD +2
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Problems solved by technology
[0005] The current detection error caused by this offset has a greater influence in the case of calculating the current integration value
For example, even when the load current is actually zero, it may be mistaken for continuous consumption of 250mA, and the integrated value may show a large value.
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[0034] Hereinafter, the present invention will be described in detail based on embodiments.
[0035] Fig. 1 is a diagram showing a first embodiment of the present invention. In this figure, 1 is the battery, 2 is the current detection resistor, 3 is the load, 4 is the input state selector, 5 is the integrator, 6 is the integrating capacitor, 7 is the integrating capacitor inverter, 8 is the first comparator , 9 is the first integral reset voltage source, 10 is the integral reset device, 11 is the pulse counter, 12 is the count value reading device, 13 is the average current value calculation device per unit time, 14 is the charger, 15 is the charge and discharge switch . 16 is the 2nd comparator, 17 is the 2nd integral reset voltage source, 18 is OR gate, 19 is increment / decrement reverse device. As a method of realizing the integral reset device 10, there are various methods as described later, but in the first embodiment, a reset switch as shown in the figure is used as a ...
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The present invention provides apparatus for detecting the integrated value of current flow, apparatus for detecting the value of current flow employing those apparatus each of which becomes insensitive to the offset in an operational amplifier. Each includes: a current sensor resistor; an integrator; an input status selector; an integration capacitor connected to the integrator; and a connection-polarity inverter of the integration capacitor. The input status selector switches alternately so as to provide two statuses of a status a and a status b at intervals of a predetermined time which are equal to one another, and in the status a, introduces therethrough the voltage which corresponds to the battery current value and which is developed across terminals of the current sensor resistor into an input of the integrator, while in the status b, inverts the polarity of the current sensor voltage developed across the terminals of the current sensor resistor to introduce therethrough the resultant voltage into the input of the integrator, or to introduce therethrough the voltage of zero to the input of the integrator. The connection-polarity inverter of the integration capacitor alternately switches connection polarity of integration capacitor.
Description
technical field [0001] The present invention relates to a current integrated value detection device and a current detection device for displaying the remaining capacity of a primary battery or a secondary battery used in a portable information terminal, etc., and a battery pack using the detection device. circuit techniques for the effects of undesired offsets. Background technique [0002] In portable information terminals such as notebook personal computers, users are always worried about how much power is left in the battery in use and how long it can be used in the future. Once the remaining battery capacity falls below a predetermined value, it is necessary to issue a warning to the user, and perform data backup and other processing. For this reason, there is a need for a method that can detect the remaining battery capacity as accurately as possible. [0003] Therefore, conventionally, it has been conceived to monitor battery charging and discharging current at any t...
Claims
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IPC IPC(8): G01R31/36
CPCG01R31/361G01R31/3648G01R31/3828G01R11/34
Inventor 野田胜竹内崇土屋光典山口刚史田中伸
Owner HITACHI LTD