EP0300537A1
Expired / Lapsed
EP
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Battery-powered device
Assignee: Koninklijke Philips NV
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Filing: 1988-07-04
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Granted: —
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Expires: 2008-07-04
Abstract
Abstract If when a load (R L ) is powered by a battery (6) first detection means (100) detect that the expired discharge time measured by measurement means (40, 70) is equal to the first reference value stored in a memory (22), first time measurement means (40, 80) measure the time during which the load (R L ) is powered by the battery (6). When the load (R L ) is switched off and is not connected to the mains voltage via a power-supply circuit (1), the battery (6) is discharged by a discharger (9). Second time-measurement means (50, 80) measure the time during which this discharger (9) is operative until second detection means (13) detect a battery voltage for which the battery (6) may be regarded as fully discharged. After comparison of the sum of the time intervals measured by the first and the second time-measurement means with a second reference value stored in a memory (21), the correction means (10) correct the reference value stored in a memory (22) in such a way that during a next discharge the sum of the time intervals measured by the first and the second time-measurement means is better in agreement with the second reference value.
Inventors
- 👤 Robert Han Munnig Schmidt
- 👤 Geert Jan Bosscha
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 05:51
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/36; H; H02; H02J; H02J7/00; H02J7/90; H02J7/92; H02J7/96; Y; Y10; Y10S; Y10S320/00; Y10S320/16; Y10S320/18; Y10S320/21
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
170 words
A device comprising - a load which can be powered by a battery, and - a power-supply circuit for charging the battery and/or powering the load, characterized in that the device further comprises - first detection means for detecting expiry of a discharge time of the battery, - second detection means for detecting a battery voltage substantially equal to a threshold value, - a discharger for discharging the battery, with the load switched off, after detection of expiry of the discharge time until detection of the threshold value, - first time-measurement means for measuring the time during which the load is powered by the battery after detection of expiry of said discharge time until the threshold value is reached, - second time-measurement means for measuring the time during which the discharger has been operative, and - correction means for correcting the expired discharge time depending on the magnitude of the weighted sum of the time intervals measured by the first and the second time-measurement means relative to a reference value.
Claim 2
Independent Claim
170 words
A device comprising - a load which can be powered by a battery, and - a power-supply circuit for charging the battery and/or powering the load, characterized in that the device further comprises - first detection means for detecting expiry of a discharge time of the battery, - second detection means for detecting a battery voltage substantially equal to a threshold value, - a discharger for discharging the battery, with the load switched off, after detection of expiry of the discharge time until detection of the threshold value, - first time-measurement means for measuring the time during which the load is powered by the battery after detection of expiry of said discharge time until the threshold value is reached, - second time-measurement means for measuring the time during which the discharger has been operative, and - correction means for correcting the expired discharge time depending on the magnitude of the weighted sum of the time intervals measured by the first and the second time-measurement means relative to a reference value.
Claim 3
Dependent Claim
58 words
A device as claimed in Claim 1, characterized in that the device further comprises: - third detection means for detecting a weighted sum of the time intervals measured by the first and second time-measurement means, which sum is substantially equal to the reference value, and for switching off the discharger or the load after detection of said sum.
Claim 4
Dependent Claim
28 words
A device is claimed in Claim 1 or 2, characterized in that the device comprises means for switching off the power-supply circuit when the discharger circuit is operative.
Claim 5
Dependent Claim
36 words
A device as claimed in Claim 1, 2 or 3, characterized in that the discharger comprises a series arrangement of a resistor and a transistor switch, which series arrangement is connected in parallel with the load.
Claim 6
Independent Claim
19 words
A device as claimed in Claim3, characterized in that a light-emitting diode is arranged in series with the resistor.
Claim 7
Dependent Claim
15 words
A dry-shaver provided with a device as claimed in any one of the preceding Claims.
Claim 8
Dependent Claim
191 words
Legend to Figure 4: Block no.: Designation: 200 start 202 t,t₀=0 204 motor on 206 mains on 208 t -→ t+1 210 t₀ < t s 220 V b < V₁ 222 BLI-LED on 223 t,t₁,t₂,t tot =0 224 motor on 226 mains on 228 t=t₁ 230 V b < V₁ 232 t -→ t+1 234 discharge on, t -→ t₁, t=t₂ 236 V b < V₁ 238 t=t+1 240 motor on 242 discharge off, t -→ t₂, t=t₁ 244 t tot =t₁+c.t₂ 248 t tot < t r 250 t s -→ t s -Δ 252 t s -→ t s +Δ 254 end Legend to Figure 5: Block no.: Designation: 300 t,t₁,t₂,t tot =0 302 motor on 304 mains on 306 t -→ t+1 308 t tot =t₁+c.t₂ 310 t tot < t r 312 t s -→ t s +Δ 314 V b < V₁ 316 t s -→ t s -Δ 318 discharge on, t -→ t₁, t=t₂ 320 t -→ t+1 322 t tot =t₁+c.t₂ 324 t tot < t r 326 V b < V₁ 328 motor on 330 discharge off, t -→ t₂, t=t₁
Claim 9
Dependent Claim
191 words
Legend to Figure 4: Block no.: Designation: 200 start 202 t,t₀=0 204 motor on 206 mains on 208 t -→ t+1 210 t₀ < t s 220 V b < V₁ 222 BLI-LED on 223 t,t₁,t₂,t tot =0 224 motor on 226 mains on 228 t=t₁ 230 V b < V₁ 232 t -→ t+1 234 discharge on, t -→ t₁, t=t₂ 236 V b < V₁ 238 t=t+1 240 motor on 242 discharge off, t -→ t₂, t=t₁ 244 t tot =t₁+c.t₂ 248 t tot < t r 250 t s -→ t s -Δ 252 t s -→ t s +Δ 254 end Legend to Figure 5: Block no.: Designation: 300 t,t₁,t₂,t tot =0 302 motor on 304 mains on 306 t -→ t+1 308 t tot =t₁+c.t₂ 310 t tot < t r 312 t s -→ t s +Δ 314 V b < V₁ 316 t s -→ t s -Δ 318 discharge on, t -→ t₁, t=t₂ 320 t -→ t+1 322 t tot =t₁+c.t₂ 324 t tot < t r 326 V b < V₁ 328 motor on 330 discharge off, t -→ t₂, t=t₁
References Cited (Backward Citations)
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