Induction type power supply system and intruding metal detection method thereof
First Claim
1. A method used for an induction type power supply system, for detecting whether an intruding metal exists in a power transmission range of the induction type power supply system, the method comprising:
- interrupting at least one driving signal of the induction type power supply system to stop driving a supplying-end coil of the induction type power supply system;
obtaining a first attenuation slope during a first period when driving of the supplying-end coil is stopped, and obtaining a second attenuation slope during a second period when driving of the supplying-end coil is stopped; and
determining whether the intruding metal exists in the power transmission range of the induction type power supply system according to the first attenuation slope and the second attenuation slope;
wherein the second period is later than the first period, and the step of determining whether the intruding metal exists in the power transmission range of the induction type power supply system according to the first attenuation slope and the second attenuation slope comprises;
increasing a value of an accumulator of intruding metal determination when a value of the first attenuation slope minus the second attenuation slope is greater than a first threshold value;
decreasing the value of the accumulator of intruding metal determination when the value of the first attenuation slope minus the second attenuation slope is smaller than the first threshold value; and
determining that the intruding metal exists in the power transmission range of the induction type power supply system when the value of the accumulator of intruding metal determination is greater than a second threshold value.
1 Assignment
0 Petitions
Accused Products
Abstract
A method used for an induction type power supply system, for detecting whether an intruding metal exists in a power transmission range of the induction type power supply system, includes interrupting at least one driving signal of the induction type power supply system to stop driving a supplying-end coil of the induction type power supply system; obtaining a first attenuation slope during a first period when driving of the supplying-end coil is stopped, and obtaining a second attenuation slope during a second period when driving of the supplying-end coil is stopped; and determining whether the intruding metal exists in the power transmission range of the induction type power supply system according to the first attenuation slope and the second attenuation slope.
-
Citations
20 Claims
-
1. A method used for an induction type power supply system, for detecting whether an intruding metal exists in a power transmission range of the induction type power supply system, the method comprising:
-
interrupting at least one driving signal of the induction type power supply system to stop driving a supplying-end coil of the induction type power supply system; obtaining a first attenuation slope during a first period when driving of the supplying-end coil is stopped, and obtaining a second attenuation slope during a second period when driving of the supplying-end coil is stopped; and determining whether the intruding metal exists in the power transmission range of the induction type power supply system according to the first attenuation slope and the second attenuation slope; wherein the second period is later than the first period, and the step of determining whether the intruding metal exists in the power transmission range of the induction type power supply system according to the first attenuation slope and the second attenuation slope comprises; increasing a value of an accumulator of intruding metal determination when a value of the first attenuation slope minus the second attenuation slope is greater than a first threshold value; decreasing the value of the accumulator of intruding metal determination when the value of the first attenuation slope minus the second attenuation slope is smaller than the first threshold value; and determining that the intruding metal exists in the power transmission range of the induction type power supply system when the value of the accumulator of intruding metal determination is greater than a second threshold value.
-
-
2. A method used for an induction type power supply system, for detecting whether an intruding metal exists in a power transmission range of the induction type power supply system, the method comprising:
-
interrupting at least one driving signal of the induction type power supply system to stop driving a supplying-end coil of the induction type power supply system; obtaining a first attenuation slope during a first period when driving of the supplying-end coil is stopped, and obtaining a second attenuation slope during a second period when driving of the supplying-end coil is stopped; and determining whether the intruding metal exists in the power transmission range of the induction type power supply system according to the first attenuation slope and the second attenuation slope; wherein the step of obtaining the first attenuation slope during the first period when driving of the supplying-end coil is stopped and obtaining the second attenuation slope during the second period when driving of the supplying-end coil is stopped comprises; retrieving a plurality of peak values of oscillation on a coil signal of the supplying-end coil when driving of the supplying-end coil is stopped; and comparing the plurality of peak values respectively with a corresponding peak voltage level among a plurality of peak voltage levels generated in a previous time driving of the supplying-end coil is stopped. - View Dependent Claims (3, 4, 5, 6, 7, 8)
-
-
9. An induction type power supply system comprising a supplying-end module, the supplying-end module comprising:
-
a supplying-end coil; a resonant capacitor, coupled to the supplying-end coil, for performing resonance together with the supplying-end coil; at least one power driver unit, coupled to the supplying-end coil and the resonant capacitor, for sending at least one driving signal to the supplying-end coil to drive the supplying-end coil to generate power and interrupting the at least one driving signal to stop driving the supplying-end coil; and a processor, for receiving a coil signal of the supplying-end coil and performing the following steps; obtaining a first attenuation slope during a first period when driving of the supplying-end coil is stopped, and obtaining a second attenuation slope during a second period when driving of the supplying-end coil is stopped; and determining whether an intruding metal exists in the power transmission range of the induction type power supply system according to the first attenuation slope and the second attenuation slope; wherein the second period is later than the first period, and the processor further performs the following steps to determine whether the intruding metal exists in the power transmission range of the induction type power supply system according to the first attenuation slope and the second attenuation slope; increasing a value of an accumulator of intruding metal determination when a value of the first attenuation slope minus the second attenuation slope is greater than a first threshold value; decreasing the value of the accumulator of intruding metal determination when the value of the first attenuation slope minus the second attenuation slope is smaller than the first threshold value; and determining that the intruding metal exists in the power transmission range of the induction type power supply system when the value of the accumulator of intruding metal determination is greater than a second threshold value.
-
-
10. An induction type power supply system comprising a supplying-end module, the supplying-end module comprising:
-
a supplying-end coil; a resonant capacitor, coupled to the supplying-end coil, for performing resonance together with the supplying-end coil; at least one power driver unit, coupled to the supplying-end coil and the resonant capacitor, for sending at least one driving signal to the supplying-end coil to drive the supplying-end coil to generate power and interrupting the at least one driving signal to stop driving the supplying-end coil; a processor, for receiving a coil signal of the supplying-end coil and performing the following steps; obtaining a first attenuation slope during a first period when driving of the supplying-end coil is stopped, and obtaining a second attenuation slope during a second period when driving of the supplying-end coil is stopped; and determining whether an intruding metal exists in the power transmission range of the induction type power supply system according to the first attenuation slope and the second attenuation slope; and a plurality of comparator modules, coupled to the processor, each of the plurality of comparator modules for retrieving a corresponding peak value among a plurality of peak values of oscillation on the coil signal when driving of the supplying-end coil is stopped, and comparing the peak value with a peak voltage level corresponding to the peak value among a plurality of peak voltage levels generated in a previous time driving of the supplying-end coil is stopped. - View Dependent Claims (12, 13, 14, 15, 16, 17)
-
-
11. An induction type power supply system comprising a supplying-end module, the supplying-end module comprising:
-
a supplying-end coil; a resonant capacitor, coupled to the supplying-end coil, for performing resonance together with the supplying-end coil; at least one power driver unit, coupled to the supplying-end coil and the resonant capacitor, for sending at least one driving signal to the supplying-end coil to drive the supplying-end coil to generate power and interrupting the at least one driving signal to stop driving the supplying-end coil; a processor, for receiving a coil signal of the supplying-end coil and performing the following steps; obtaining a first attenuation slope during a first period when driving of the supplying-end coil is stopped, and obtaining a second attenuation slope during a second period when driving of the supplying-end coil is stopped; and determining whether an intruding metal exists in the power transmission range of the induction type power supply system according to the first attenuation slope and the second attenuation slope; and a comparator module, coupled to the processor, for respectively retrieving a plurality of peak values of oscillation on the coil signal when driving of the supplying-end coil is stopped, and in turn comparing a peak value among the plurality of peak values with a peak voltage level corresponding to the peak value among a plurality of peak voltage levels generated in a previous time driving of the supplying-end coil is stopped.
-
-
18. A method used for an induction type power supply system, for detecting whether an intruding metal exists in a power transmission range of the induction type power supply system, the method comprising:
-
interrupting at least one driving signal of the induction type power supply system to stop driving a supplying-end coil of the induction type power supply system; setting a reference voltage level; detecting a coil signal of the supplying-end coil to obtain time points of two continuous times the coil signal rises to exceed the reference voltage level when driving of the supplying-end coil is stopped; obtaining a length of oscillation cycle of the coil signal when driving of the supplying-end coil is stopped according to the time points of two continuous times the coil signal rises to exceed the reference voltage level; and obtaining an attenuation slope of the coil signal when driving of the supplying-end coil is stopped according to the length of oscillation cycle. - View Dependent Claims (19, 20)
-
Specification