POWER TRANSMISSION DEVICE, ELECTRONIC INSTRUMENT, AND WAVEFORM MONITORING CIRCUIT
First Claim
1. A power transmission device included in a non-contact power transmission system that transmits power to a power reception device by electromagnetically coupling a primary coil and a secondary coil to transmit power to a load of the power reception device, the power transmission device comprising:
- a waveform monitoring circuit that generates and outputs a waveform-monitoring induced voltage signal based on a coil end signal of the primary coil; and
a power transmission control device that controls a power transmission driver that drives the primary coil, the power transmission control device receiving the waveform-monitoring induced voltage signal and detecting a waveform of the induced voltage signal to detect a power-reception-side load state,the waveform monitoring circuit including a first rectifier circuit having a limiter function, the first rectifier circuit including a first resistor that is a current-limiting resistor provided between a coil end node where the coil end signal of the primary coil is generated and a first monitoring node where a waveform-monitoring first induced voltage signal is generated, performing a limiter operation that clamps the first induced voltage signal at a high-potential-side power supply voltage, and performing a half-wave rectification of the first induced voltage signal.
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Accused Products
Abstract
A power transmission device of a non-contact power transmission system includes a waveform monitoring circuit that generates and outputs a waveform-monitoring induced voltage signal based on a coil end signal of a primary coil, and a power transmission control device that controls a power transmission driver that drives the primary coil, the power transmission control device receiving the waveform-monitoring induced voltage signal and detecting a change in waveform of the induced voltage signal to detect a power-reception-side load state. The waveform monitoring circuit includes a first rectifier circuit having a limiter function, the first rectifier circuit including a current-limiting resistor provided between a coil end node where the coil end signal of the primary coil is generated and a monitoring node where the waveform-monitoring induced voltage signal is generated, performing a limiter operation that clamps the induced voltage signal at a high-potential-side power supply voltage, and subjecting the induced voltage signal to half-wave rectification.
63 Citations
19 Claims
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1. A power transmission device included in a non-contact power transmission system that transmits power to a power reception device by electromagnetically coupling a primary coil and a secondary coil to transmit power to a load of the power reception device, the power transmission device comprising:
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a waveform monitoring circuit that generates and outputs a waveform-monitoring induced voltage signal based on a coil end signal of the primary coil; and a power transmission control device that controls a power transmission driver that drives the primary coil, the power transmission control device receiving the waveform-monitoring induced voltage signal and detecting a waveform of the induced voltage signal to detect a power-reception-side load state, the waveform monitoring circuit including a first rectifier circuit having a limiter function, the first rectifier circuit including a first resistor that is a current-limiting resistor provided between a coil end node where the coil end signal of the primary coil is generated and a first monitoring node where a waveform-monitoring first induced voltage signal is generated, performing a limiter operation that clamps the first induced voltage signal at a high-potential-side power supply voltage, and performing a half-wave rectification of the first induced voltage signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A waveform monitoring circuit provided in a power transmission device included in a non-contact power transmission system that transmits power to a power reception device by electromagnetically coupling a primary coil and a secondary coil to transmit power to a load of the power reception device, the waveform monitoring circuit comprising:
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a first rectifier circuit having a limiter function, the first rectifier circuit including a first resistor that is a current-limiting resistor provided between a coil end node where a coil end signal of the primary coil is generated and a first monitoring node where a waveform-monitoring first induced voltage signal is generated, performing a limiter operation that clamps the first induced voltage signal at a high-potential-side power supply voltage, performing a half-wave rectification of the first induced voltage signal, and outputting the first induced voltage signal to a power transmission control device of the power transmission device; and a second rectifier circuit that includes a second resistor that is a current-limiting resistor provided between the coil end node and a second monitoring node where a waveform-monitoring second induced voltage signal is generated, a third resistor provided between the second monitoring node and a low-potential-side power supply node, and a third diode provided between the second monitoring node and the low-potential-side power supply node, a forward direction of the third diode being a direction from the low-potential-side power supply node to the second monitoring node, the second rectifier circuit outputting the second induced voltage signal to the power transmission control device.
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Specification