Information transmitter and an apparatus including the same
There are provided an information transmitter and an apparatus including the same. The information transmitter includes a signal generator configured to output an information signal including pulses changed from a first state to a second state or a third state and subsequently changed from the second state or the third state to the first state. A time period in which some of the pulses are changed from the first state to the second state or the third state may be shorter than a time period in which some of the pulses are changed from the second state or the third state to the first state. The information transmitter also includes a transmitting coil configured to receive the information signal and generate a magnetic field based on the information signal.
1. An apparatus, comprising:
a signal generator configured to output an information signal, the information signal comprising pulses changed from a state of zero voltage to a state of a positive reference voltage or a state of a negative reference voltage and subsequently changed from the state of the positive reference voltage or the state of the negative reference voltage to the state of zero voltage, such that (1) a first time period in which some of the pulses are changed from the state of zero voltage to the state of the positive reference voltage or the state of the negative reference voltage satisfies a first condition having a step function, (2) a second time period in which some of the pulses are changed from the state of the positive reference voltage or the state of the negative reference voltage to the state of zero voltage satisfies a second condition other than the step function, (3) the state of the positive reference voltage is maintained for a third time period after a first change from the state of zero voltage to the state of the positive reference voltage, and (4) the state of the negative reference voltage is maintained for the third time period after a second change from the state of zero voltage to the state of the negative reference voltage; and
a transmitting coil configured to receive the information signal and generate a magnetic field based on the information signal,
wherein the signal generator comprises,
a controller configured to output a control signal based on information to be transmitted, and
a generator configured to output the information signal in response to the control signal, and
wherein the generator comprises,
a capacitor connected to the transmitting coil in series, and
at least one switch configured to apply a voltage to one end of the capacitor in response to the control signal.
2. The apparatus of claim 1 , wherein the information signal linearly changes with respect to a time in some sections thereof in response to the information signal changing from the state of the positive reference voltage or the state of the negative reference voltage to the state of zero voltage.
3. The apparatus of claim 1 , wherein the information signal exponentially changes with respect to a time in some sections in response to the information signal changing from the state of the positive reference voltage or the state of the negative reference voltage to the state of zero voltage.
4. The apparatus of claim 1 , wherein the information signal changes from the state of the positive reference voltage or the state of the negative reference voltage to the state of zero voltage after a fourth time period elapses.
5. The apparatus of claim 1 , wherein the signal generator comprises:
a storage configured to store information signal values corresponding to a magnitude of the information signal based on a time and provide the information signal values; and
an information signal generator configured to generate the information signal in response to the information signal values.
6. An apparatus, comprising:
a battery configured to supply power; and
an information transmitter configured to receive the power and transmit information, the information transmitter comprising,
a signal generator configured to output an information signal, the information signal comprising pulses changed from a state of zero voltage to a state of a positive reference voltage or a state of a negative reference voltage and subsequently changed from the state of the positive reference voltage or the state of the negative reference voltage to the state of zero voltage, such that (1) a first time period in which some of the pulses are changed from the state of zero voltage to the state of the positive reference voltage or the state of the negative reference voltage satisfies a first condition having a step function, (2) a second time period in which some of the pulses are changed from the state of the positive reference voltage or the state of the negative reference voltage to the state of zero voltage satisfies a second condition other than the step function, (3) the state of the positive reference voltage is maintained for a third time period after a first change from the state of zero voltage to the state of the positive reference voltage, and (4) the state of the negative reference voltage is maintained for the third time period after a second change from the state of zero voltage to the state of the negative reference voltage, and
a transmitting coil configured to receive the information signal and generate a magnetic field based on the information signal to transmit the information,
wherein the signal generator comprises,
a controller configured to output a control signal based on information to be transmitted,
a capacitor connected to the transmitting coil in series, and
at least one switch configured to apply a voltage to one end of the capacitor in response to the control signal.
7. The apparatus of claim 6 , wherein the information signal changes from the state of the positive reference voltage or the state of the negative reference voltage to the state of zero voltage after a fourth time period elapses.
8. The apparatus of claim 6 , wherein the signal generator comprises:
a storage configured to store information signal values corresponding to a magnitude of the information signal based on a time and provide the information signal values; and
an informational signal generator configured to generate the information signal in response to the information signal values.
9. An information transmitter, comprising:
a signal generator comprising,
a storage configured to store an information signal value corresponding to a magnitude of an information signal, and
a generator circuit configured to generate the information signal having a magnitude corresponding to the information signal value, the information signal comprising a first pulse shifted from a state of zero voltage to a state of a positive reference voltage or a state of a negative reference voltage in a first time period and a second pulse shifted from the state of the positive reference voltage or the state of the negative reference voltage to the state of zero voltage in a second time period, such that (1) the first time period satisfies a condition having a step function, (2) the second time period satisfies a condition other than the step function, (3) the state of the positive reference voltage is maintained for a third time period after a first change from the state of zero voltage to the state of the positive reference voltage, and (4) the state of the negative reference voltage is maintained for the third time period after a second change from the state of zero voltage to the state of the negative reference voltage; and
a transmitting coil configured to produce a magnetic flux based on the information signal,
wherein the signal generator further includes,
a control circuit configured to output a control signal based on information to be transmitted,
a capacitor connected to the transmitting coil in series, and
at least one switch configured to apply a voltage to one end of the capacitor in response to the control signal.
10. The information transmitter of claim 9 , wherein an amount of consumed power is in proportion to a value obtained by integrating a square of a voltage of the information signal applied to the transmitting coil with respect to a time.
11. The information transmitter of claim 9 , wherein the magnetic flux varies based on a type of the information signal to be transmitted.
12. The apparatus of claim 6 , wherein the information transmitter is configured to transmit information based on a magnetic secure transfer scheme.