CN211089239U - Optical feedback circuit for self-tuning wireless power supply - Google Patents
Optical feedback circuit for self-tuning wireless power supply Download PDFInfo
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- CN211089239U CN211089239U CN201921705162.XU CN201921705162U CN211089239U CN 211089239 U CN211089239 U CN 211089239U CN 201921705162 U CN201921705162 U CN 201921705162U CN 211089239 U CN211089239 U CN 211089239U
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Abstract
The utility model relates to an optical feedback circuit for self-tuning wireless power supply, which comprises a secondary side signal extraction circuit and a primary side signal comparison control circuit, wherein a current detection resistor is connected in series with the secondary side of a wireless power supply circuit, and the secondary side current flows to form a voltage signal to control the on-off of a depletion type MOS (metal oxide semiconductor) tube; the sampling resistor and the light-emitting diode are connected in parallel to the drain electrode of the MOS tube, a proper sampling resistor resistance value is selected, and the light-emitting diode emits light and sends an optical signal only when the drain electrode of the MOS tube reaches a conduction current peak value; the optical signal is received by the photodiode, and is transmitted to the microcontroller through the trans-impedance amplifier and the zero-crossing comparator in sequence. The utility model has the advantages of low power consumption and high efficiency.
Description
Technical Field
The utility model belongs to from the wireless power supply field of tuning, especially the feedback path in the wireless power supply technique of automatic tuning about LL C topological structure.
Background
The LL C topology is a classic transformer circuit and can be used as the electromagnetic induction wireless power supply field, when a self-tuning wireless power supply system based on the LL C topology works, if the transmission distance changes, the resonant frequency of the circuit can be changed, and meanwhile, the system can automatically recognize the change of the resonant frequency and adjust the working frequency to automatically track the resonant frequency, and a primary side path for automatic tracking and dissipation needs to be established, so that a more simple and efficient feedback way is needed to be established.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a simple efficient feedback path implementation mode to the low consumption provides the feedback path for LL C topological structure's self-tuning wireless power supply technique technical scheme as follows:
an optical feedback circuit for self-tuning wireless power supply, the feedback circuit comprising a secondary signal extraction circuit and a primary signal comparison control circuit, characterized in that the secondary signal extracts a secondary current as a feedback signal, wherein,
the current detection resistor is connected in series with the secondary side of the wireless power supply circuit, and the current of the secondary side flows through the secondary side to become a voltage signal to control the on-off of the depletion type MOS tube;
the sampling resistor and the light-emitting diode are connected in parallel to the drain electrode of the MOS tube, a proper sampling resistor resistance value is selected, and the light-emitting diode emits light and sends an optical signal only when the drain electrode of the MOS tube reaches a conduction current peak value;
the optical signal is received by the photodiode, and is transmitted to the microcontroller through the trans-impedance amplifier and the zero-crossing comparator in sequence.
Drawings
FIG. 1 shows a circuit block diagram of an optical feedback circuit implementation;
FIG. 2 shows VGSAnd (4) waveform.
In fig. 1: 1 is a direct current power supply; 2 is an inverter bridge circuit; 3 is a resonant circuit; 4 is a transformer wireless power supply circuit; 5 is a rectifying and filtering circuit; 6 is the equivalent load; 7 is a half-bridge driving chip; and 8 is a microcontroller. 9 is a sampling resistor; 10 is a light emitting diode; 11 is a depletion MOS tube; 12 is a current sensing resistor; 13 is an optical signal; 14 is a photodiode; 15 is a transimpedance amplifier; 16 is a zero-crossing comparator, and 17 is a MOS tube drain current.
In fig. 2: reference numeral 18 denotes a depletion type MOS transistor turn-on voltage, 19 denotes a threshold voltage at which the light emitting diode is turned on, and 20 denotes a turn-on time of the light emitting diode per turn.
Detailed Description
The self-tuning wireless power supply circuit to LL C topological structure, the utility model provides a wireless feedback loop's embodiment can satisfy wireless power supply's operation requirement, compares in traditional feedback loop, the utility model discloses provide the feedback with extremely low consumption, avoided reducing wireless power supply's power supply efficiency because of feedback loop's introduction.
According to LL C topology wireless power supply principle, utilize feedback loop to draw the zero point information of secondary side current as the feedback quantity, control primary side voltage and secondary side current cophase, can realize the automatic tracking to resonant frequency the utility model discloses utilize and examine that current resistance 12 will change the secondary side current through the rectification into voltage output, the voltage signal of loading on examining current resistance 12 is shown in fig. 2.
The wireless feedback circuit of the feedback circuit is shown in fig. 1 and comprises a depletion type mos tube 11, a sampling resistor 9, a light emitting diode 10 and a photodiode 14, and the specific connection mode is shown in fig. 1.
The specific implementation method is to use the voltage signal of the current detection resistor 12 as the control signal of the depletion type mos tube 11, and adjust the resistance value of the current detection resistor 12, so that the voltage signal can control the mos tube to be turned off and turned on, as shown in fig. 2, 18 is the on voltage of the mos tube. When V isGSWhen the voltage is increased to a conducting voltage 18, the mos tube is conducted, and the drain current 17 of the mos tube is very small along with the voltage VGSThe drain current 17 is gradually increased, the drain current 10 is converted into a voltage signal by the sampling resistor 9 and is loaded at two ends of the light emitting diode 10, and when the voltage V is increased by adjusting the resistance value of the sampling resistor 9GSThe led 10 is turned on to emit light at zero time, as shown in fig. 2, 19 is the threshold voltage of the led, and 20 is the light emitting time of each period of the led. The zero point information of the secondary side current is extracted through the method, and meanwhile, the light emitting diode only emits light once in each period and has short time, so that the influence of the introduction of the circuit on the power consumption of the secondary side circuit is small.
The primary circuit receives an optical signal 13 generated by the light emitting diode 10 by using the photodiode 14, the light emitting diode 14 generates an output current after receiving the optical signal 13, the output current is amplified by the transimpedance amplifier 15 and is transmitted to the zero-crossing comparator 16 for zero point extraction, and the zero-crossing comparator 16 transmits a zero-point signal to the microcontroller 8 for processing.
The microprocessor 8 adjusts the working frequency of the circuit to make the zero phase of the output voltage of the inverter circuit the same as the zero phase of the secondary side signal, thereby realizing the tracking of the resonant frequency.
Claims (1)
1. An optical feedback circuit for self-tuning wireless power supply, the feedback circuit comprising a secondary signal extraction circuit and a primary signal comparison control circuit, characterized in that the secondary signal extracts a secondary current as a feedback signal, wherein,
the current detection resistor is connected in series with the secondary side of the wireless power supply circuit, and the current of the secondary side flows through the secondary side to become a voltage signal to control the on-off of the depletion type MOS tube;
the sampling resistor and the light-emitting diode are connected in parallel to the drain electrode of the MOS tube, a proper sampling resistor resistance value is selected, and the light-emitting diode emits light and sends an optical signal only when the drain electrode of the MOS tube reaches a conduction current peak value;
the optical signal is received by the photodiode, and is transmitted to the microcontroller through the trans-impedance amplifier and the zero-crossing comparator in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921705162.XU CN211089239U (en) | 2019-10-12 | 2019-10-12 | Optical feedback circuit for self-tuning wireless power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921705162.XU CN211089239U (en) | 2019-10-12 | 2019-10-12 | Optical feedback circuit for self-tuning wireless power supply |
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| CN211089239U true CN211089239U (en) | 2020-07-24 |
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| CN201921705162.XU Active CN211089239U (en) | 2019-10-12 | 2019-10-12 | Optical feedback circuit for self-tuning wireless power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110676949A (en) * | 2019-10-12 | 2020-01-10 | 天津大学 | Optical feedback circuit for self-tuning wireless power supply |
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2019
- 2019-10-12 CN CN201921705162.XU patent/CN211089239U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110676949A (en) * | 2019-10-12 | 2020-01-10 | 天津大学 | Optical feedback circuit for self-tuning wireless power supply |
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