CN212726580U - Wireless charging overvoltage protection device and system - Google Patents
Wireless charging overvoltage protection device and system Download PDFInfo
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Abstract
The utility model belongs to the technical field of wireless charging, especially, relate to a wireless overvoltage protection device and system that charges, wireless overvoltage protection device that charges includes transmitting terminal and receiving terminal, the transmitting terminal includes the first resonance unit of being connected with the power end, the receiving terminal includes the second resonance unit of being connected with the load end, a serial communication port, the receiving terminal still includes the overvoltage protection unit of being connected with second resonance unit, the overvoltage protection unit including be used for detecting the overvoltage detection module whether the output voltage of receiving terminal is excessive pressure and with the resonance adjustment module of being connected with overvoltage detection module and second resonance unit respectively. The overvoltage detection module detects whether the output voltage of the receiving end is overvoltage or not, and under the condition that overvoltage occurs, the resonance adjusting unit and the second resonance unit form a new resonance circuit, so that the output voltage of the receiving end cannot be too high, and a device with high withstand voltage and high overcurrent capacity is not needed to be adopted by a device of the receiving end.
Description
Technical Field
The utility model belongs to the technical field of wireless charging, especially, relate to a wireless overvoltage protection device and system that charges.
Background
The wireless charging system is characterized in that the transmitting coil and the receiving coil transmit energy through a magnetic field to realize non-contact transmission of electric energy. Because the multifunctionality is good, the reliability is high, the flexibility is good, security and life are higher, in addition contactless, the characteristics of no wearing and tearing, the wireless power consumption demand of electronic equipment under the different conditions can be satisfied to the wireless charging technology, compromises the demand of information transmission function simultaneously.
However, the distance between the transmitting coil and the receiving coil changes in the working process of the wireless charging system, especially, the distance between the transmitting coil and the receiving coil changes suddenly, and the coupling coefficient between the coils changes suddenly, which may cause the voltage or current of the controller at the receiving end to increase suddenly, damage the device or load at the receiving end, and seriously affect the reliability and stability of the wireless charging system.
The current common method is to detect the voltage of a receiving terminal, transmit an overvoltage signal to a transmitting terminal through wireless communication, and finally turn off a drive to protect the transmitting terminal. However, the above-mentioned method is relatively serious, and there is a delay time of about 300ms, which causes that the voltage or current is very large during the protection, and the situation that the wireless communication has a risk problem of communication failure, and communication interruption and the like is caused, and the protection cannot be performed in time, so that the receiving end needs to adopt a device with very high withstand voltage and stronger overcurrent capability, so that the efficiency is reduced, the cost is increased, the volume of the controller is greatly increased, and the auxiliary power supply is difficult to be realized because the voltage variation range is too large. However, even if the receiving end adopts a device with high withstand voltage and strong overcurrent, the receiving end cannot be guaranteed to be effectively protected, and the device or the load of the receiving end still can be damaged at a certain probability.
SUMMERY OF THE UTILITY MODEL
The utility model provides a wireless overvoltage protector that charges aims at solving current overvoltage protector and needs wireless communication to inform the transmitting terminal, has the time delay condition, and the protection reliability is low for the receiving terminal need adopt withstand voltage very high and the technical problem of the stronger device of ability that overflows.
The utility model discloses a realize like this, provide a wireless overvoltage protector that charges, including transmitting terminal and receiving terminal, the transmitting terminal includes the first resonance unit of being connected with the power end, the receiving terminal includes the second resonance unit of being connected with the load end, the receiving terminal still include with the overvoltage protection unit that the second resonance unit is connected, overvoltage protection unit is including being used for detecting whether overvoltage detection module of overvoltage and with respectively with overvoltage detection module with the resonance adjustment module that the second resonance unit is connected of output voltage of receiving terminal.
Furthermore, the resonance adjusting module comprises a first switch tube, a second switch tube, a first capacitor and a second capacitor, the first switch tube is connected with the overvoltage detecting module, the first capacitor and the grounding terminal, the second switch tube is connected with the overvoltage detecting module, the second capacitor and the grounding terminal, and the first capacitor and the second capacitor are connected with the second resonance unit.
Furthermore, the first switching tube is a first MOS tube, and the second switching tube is a second MOS tube.
Further, the overvoltage detection module comprises a comparator, a first resistor, a second resistor, a third resistor and a fourth resistor, wherein the output voltage of the receiving end is output to one end of the first resistor, the other end of the first resistor is connected with one end of the second resistor and one end of the third resistor respectively, the other end of the second resistor is connected with the grounding end, the other end of the third resistor is connected with the in-phase input end of the comparator and one end of the fourth resistor respectively, and the other end of the fourth resistor is connected with the output end of the comparator, the first switch tube and the second switch tube respectively.
Furthermore, the overvoltage detection module comprises an ADC sampler, an MCU controller, a fifth resistor and a sixth resistor, the output voltage of the receiving end is output to one end of the fifth resistor, the other end of the fifth resistor is respectively connected with one end of the sixth resistor and the ADC sampler, the other end of the sixth resistor is connected with a grounding end, the ADC sampler is connected with the MCU controller, and the MCU controller is connected with the first switch tube and the second switch tube.
Furthermore, the first resonance unit is a transmitting end series resonance module, and the second resonance unit comprises a receiving end series resonance module and a rectifying module connected with the receiving end series resonance module.
Furthermore, the transmitting terminal series resonance module comprises a transmitting coil, a third switch tube, a fourth switch tube, a third capacitor and a fourth capacitor, the third switch tube is respectively connected with the power end, the fourth switch tube, the third capacitor and one end of the transmitting coil, the fourth switch tube is respectively connected with the power end and one end of the fourth capacitor, and the other end of the fourth capacitor is connected with the other end of the transmitting coil.
Furthermore, the third switching tube is a third MOS tube, and the fourth switching tube is a fourth MOS tube.
Furthermore, the receiving end series resonance module comprises a receiving coil and a fifth capacitor, the rectifying module comprises a first diode, a second diode, a third diode, a fourth diode and a sixth capacitor, one end of the receiving coil is connected with one end of the fifth capacitor, the other end of the fifth capacitor is respectively connected with the resonance adjusting unit, the anode of the first diode and the cathode of the third diode, the cathode of the first diode is respectively connected with the cathode of the second diode, one end of the sixth capacitor and the overvoltage detection module, the anode of the second diode is respectively connected with the other end of the receiving coil, the resonance adjusting unit and the cathode of the fourth diode, and the anode of the third diode is respectively connected with the anode of the fourth diode and the other end of the sixth capacitor, the sixth capacitor is also connected in parallel with the load end.
The utility model also provides a wireless overvoltage protection system that charges, include:
a load end; and
the wireless charging overvoltage protection device is described above;
wherein the load terminal is connected to the second resonance unit.
The beneficial effects of the utility model reside in that, whether overvoltage detection module detects the output voltage of receiving terminal excessive pressure, under the condition that takes place excessive pressure, new resonant circuit is constituteed with the second resonance unit to resonance adjustment unit for the output voltage of receiving terminal can not be too high, all plays the guard action to receiving terminal device and load, and therefore, the receiving terminal device need not to adopt withstand voltage very high and the stronger device of overcurrent capacity, can not all suffer from the damage because of the voltage is too high.
Drawings
Fig. 1 is a block diagram of a wireless charging overvoltage protection device provided in an embodiment of the present invention;
fig. 2 is a circuit diagram of a first resonance unit and a second resonance unit provided by an embodiment of the present invention;
fig. 3 is a circuit diagram of an overvoltage protection unit according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a first implementation of an overvoltage detection module according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a second implementation of an overvoltage detection module according to an embodiment of the present invention;
fig. 6 is an equivalent circuit diagram after resonance adjustment of the second resonance unit provided by the embodiment of the present invention;
fig. 7 is a coordinate axis diagram of time-output voltage when overvoltage occurs by using the wireless charging overvoltage protection device provided by the embodiment of the invention;
fig. 8 is a coordinate axis diagram of time-output voltage when overvoltage occurs in the unused wireless charging overvoltage protection device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The utility model discloses in, whether overvoltage detection module 221 detects the output voltage of receiving terminal excessive pressure, under the condition that takes place the excessive pressure, new resonant circuit is constituteed with second resonance unit 210 to resonance adjustment unit for the output voltage of receiving terminal can not be too high, all play the guard action to receiving terminal device and load end, so, the receiving terminal device need not to adopt withstand voltage very high and the stronger device of overcurrent capacity, can not suffer from the damage because of voltage is too high everywhere.
Example one
The embodiment provides a wireless charging overvoltage protection device, refer to fig. 1, and include a transmitting terminal and a receiving terminal, the transmitting terminal includes the first resonant unit 110 connected with the power end, the receiving terminal includes the second resonant unit 210 connected with the load end, the receiving terminal further includes an overvoltage protection unit 220 connected with the second resonant unit 210, the overvoltage protection unit 220 includes an overvoltage detection module 221 for detecting whether the output voltage of the receiving terminal is overvoltage and a resonance adjustment module 222 respectively connected with the overvoltage detection module 221 and the second resonant unit 210.
The power terminal transmits electricity to the first resonant unit 110, the first resonant unit 110 is in a magnetic field coupling region that is not electrically connected to the second resonant unit 210, the first resonant unit 110 transmits energy to the second resonant unit 210 by electromagnetic conversion, and the second resonant unit 210 transmits electricity to the load terminal.
In the wireless charging process, the overvoltage detection module 221 detects whether the output voltage transmitted from the receiving terminal to the load terminal is overvoltage, and transmits a signal to the resonance adjustment module 222 according to the overvoltage condition, so that the resonance adjustment module 222 is connected or not connected to the circuit of the receiving terminal.
If an overvoltage occurs during the wireless charging process, the overvoltage detection module 221 transmits a conduction signal to the resonance adjustment module 222, so that the resonance adjustment module 222 is conducted, the resonance adjustment module 222 and the second resonance unit 210 form a new resonance circuit, and the resonance adjustment module 222 participates in the resonance state of the second resonance unit 210, so that the output voltage of the receiving end is not too high, and both the receiving end device and the load end are protected. Since the output voltage of the receiving end is not too high, the situation that the device and the load end of the receiving end are damaged is not worried about, and then the transmitting end can be informed by adopting wireless communication so as to enable the transmitting end to make corresponding response, such as restarting after being turned off. Or other methods are adopted to enable the transmitting end to know that the receiving end has the overvoltage condition, for example, after the overvoltage protection is triggered, the current of the transmitting coil Lp is suddenly reduced due to the change of the resonance parameter, so that whether the current of the transmitting end is suddenly reduced can be judged by sampling the current of the transmitting end, and the judgment basis of whether the receiving end is in overvoltage or not can be taken as the judgment basis.
If no overvoltage occurs during the wireless charging process, the overvoltage detection module 221 transmits a disconnection signal to the resonance adjustment module 222, so that the resonance adjustment module 222 maintains a disconnection state and is not connected to the second resonance unit 210, and the circuit at the receiving end is not affected.
Referring to fig. 3, the resonance adjustment module 222 includes a first switch tube, a second switch tube, a first capacitor C5 and a second capacitor C6, the first switch tube is respectively connected to the overvoltage detection module 221, the first capacitor C5 and a ground terminal, the second switch tube is respectively connected to the overvoltage detection module 221, the second capacitor C6 and the ground terminal, and the first capacitor C5 and the second capacitor C6 are both connected to the second resonance unit 210.
When the overvoltage detection module 221 transmits a conduction signal to the resonance adjustment module 222, the first switch and the second switch are both turned on, so that the first capacitor C5 and the second capacitor C6 are both connected to the second resonance unit 210, and form a new resonance circuit with the second resonance unit 210, so that the output voltage at the receiving end is not too high.
When the overvoltage detection module 221 transmits the turn-off signal to the resonance adjustment module 222, the first switch tube and the second switch tube are both kept in the turn-off state, so that the first capacitor C5 and the second capacitor C6 are not connected to the second resonance unit 210, and the resonance process at the receiving end is not affected.
The first switching tube is a first MOS tube Q3, and the second switching tube is a second MOS tube Q4. Of course, other devices, such as a relay and a semiconductor switch tube, may be used for the first switch tube and the second switch tube, as long as the same or corresponding functions can be achieved, and are not described in detail herein.
Referring to fig. 4, the overvoltage detection module 221 includes a comparator, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4, an output voltage of the receiving end is outputted to one end of the first resistor R1, the other end of the first resistor R1 is connected to one end of the second resistor R2 and one end of the third resistor R3, the other end of the second resistor R2 is connected to a ground terminal, the other end of the third resistor R3 is connected to the non-inverting input end of the comparator and one end of the fourth resistor R4, and the other end of the fourth resistor R4 is connected to the output end of the comparator, the first switch tube, and the second switch tube.
The output voltage of the receiving end is transmitted to the non-inverting input end of the comparator after passing through the first resistor R1, the second resistor R2 and the third resistor R3, the inverting input end of the comparator is provided with a comparison voltage, and the output voltage is compared with the comparison voltage. When the output voltage is higher than the comparison voltage, the comparator outputs an OVP signal (high level) to the first switch tube and the second switch tube through the output end, so that the first switch tube and the second switch tube are conducted. When the output voltage is lower than the comparison voltage, the comparator outputs an OVP signal (low level) to the first switch tube and the second switch tube through the output end, so that the first switch tube and the second switch tube are disconnected.
In the present embodiment, the comparator may also adopt other devices, such as an operational amplifier and the like.
Other implementations for the over-voltage detection module 221 are also possible. Referring to fig. 5, the overvoltage detection module 221 includes an ADC sampler, an MCU controller, a fifth resistor R5 and a sixth resistor R6, the output voltage of the receiving end is output to one end of the fifth resistor R5, the other end of the fifth resistor R5 is connected to one end of the sixth resistor R6 and the ADC sampler respectively, the other end of the sixth resistor R6 is connected to a ground terminal, the ADC sampler is connected to the MCU controller, and the MCU controller is connected to the first switch tube and the second switch tube.
ADC samplers (Analog-to-Digital converters) refer to Analog-to-Digital converters that are capable of converting a continuously varying Analog signal into a discrete Digital signal. After the ADC sampler acquires the output voltage of the receiving end, the digital signal is transmitted to the MCU controller through analog-to-digital conversion, and the MCU controller forms a processing signal according to the digital signal. Specifically, when an overvoltage condition occurs at the receiving end, the MCU controller transmits a high level to the first switch tube and the second switch tube according to the digital signal transmitted by the ADC sampler, so that the first switch tube and the second switch tube are conducted. When the receiving end is not in an overvoltage condition, the MCU controller transmits a low level to the first switch tube and the second switch tube according to the digital signal transmitted by the ADC sampler, so that the first switch tube and the second switch tube are disconnected.
Specifically, the first resonance unit 110 is a transmitting end series resonance module, and the second resonance unit 210 includes a receiving end series resonance module 211 and a rectification module 212 connected to the receiving end series resonance module 211. The transmitting end series resonance module converts direct current transmitted by a power end into high-frequency alternating current power and transmits the high-frequency alternating current power to the receiving end series resonance module 211, the receiving end series resonance module 211 transmits the high-frequency alternating current power to the rectifying module 212, and the rectifying module 212 converts the high-frequency alternating current power into direct current power and transmits the direct current power to a load end, so that wireless charging of the load end is realized.
Referring to fig. 2, DC refers to a power supply end, the transmitting end series resonance module includes a transmitting coil Lp, a third switching tube, a fourth switching tube, a third capacitor C1, and a fourth capacitor C2, the third switching tube is connected to the power supply end, the fourth switching tube, the third capacitor C1, and one end of the transmitting coil Lp, the fourth switching tube is connected to the power supply end and one end of the fourth capacitor C2, and the other end of the fourth capacitor C2 is connected to the other end of the transmitting coil Lp. The transmitting coil Lp, the third switching tube, the fourth switching tube, the third capacitor C1 and the fourth capacitor C2 form a resonant circuit of a transmitting end.
The third switching tube is a third MOS tube Q1, and the fourth switching tube is a fourth MOS tube Q2. Of course, other devices, such as a relay and a semiconductor switch tube, may be adopted for the third switch tube and the fourth switch tube, as long as the same or corresponding functions can be achieved, and the details are not repeated here.
Referring to fig. 2, Rload refers to a load terminal, the receiving terminal series resonant module 211 includes a receiving coil Ls and a fifth capacitor C3, the rectifying module 212 includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4 and a sixth capacitor C4, one end of the receiving coil Ls is connected to one end of the fifth capacitor C3, the other end of the fifth capacitor C3 is respectively connected to the resonance adjusting unit, the anode of the first diode D1 and the cathode of the third diode D3, the cathode of the first diode D1 is respectively connected to the cathode of the second diode D2, one end of the sixth capacitor C4 and the overvoltage detection module 221, the anode of the second diode D2 is respectively connected to the other end of the receiving coil Ls, the resonance adjusting unit and the cathode of the fourth diode D4, the anode of the third diode D3 is respectively connected to the anode of the fourth diode D4 and the other end of the sixth capacitor C4, the sixth capacitor C4 is also connected in parallel with the load terminal.
The receiving coil Ls and the fifth capacitor C3 constitute a resonant circuit at the receiving end, and the first diode D1, the second diode D2, the third diode D3, the fourth diode D4 and the sixth capacitor C4 constitute a full-bridge rectification circuit. When the receiving end is over-voltage, the first switch tube and the second switch tube are turned on, so that the first capacitor C5 and the second capacitor C6 are connected to the receiving end series resonance module 211, and the first capacitor C5, the second capacitor C6 and the fifth capacitor C3 form a new resonance circuit, so that the output voltage of the receiving end cannot be too high.
In this embodiment, after triggering the overvoltage protection, the output voltage of the receiving end can be calculated by the following formula
：
Wherein,
referring to the impedance of the resonant circuit at the transmitting end, the impedance can be calculated by the following formula:
Referring to fig. 7, if the wireless charging overvoltage protection device is used, when the receiving terminal is in overvoltage, the output voltage of the receiving terminal does not exceed 80V, so that the receiving terminal only needs to use a device with a voltage withstanding grade of 100V to effectively play a role in protection. Referring to fig. 8, if the wireless charging overvoltage protection device is not used, when the receiving terminal overvoltage occurs, the output voltage of the receiving terminal continuously increases along with the time change. The wireless charging overvoltage protection device has extremely high protection reliability.
Example two
The second embodiment provides a wireless overvoltage protection system that charges, includes:
a load end; and
the wireless charging overvoltage protection device according to embodiment one;
wherein the load terminal is connected to the second resonant unit 210.
The wireless charging overvoltage protection system is characterized in that the wireless charging overvoltage protection device is used, the overvoltage detection module 221 detects whether the output voltage of the receiving end is overvoltage or not, and under the condition that overvoltage occurs, the resonance adjustment unit and the second resonance unit 210 form a new resonance circuit, so that the output voltage of the receiving end cannot be too high, and the receiving end device and the load end are protected.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a wireless overvoltage protector that charges, includes transmitting terminal and receiving terminal, the transmitting terminal includes the first resonance unit of being connected with the power end, the receiving terminal includes the second resonance unit of being connected with the load end, a serial communication port, the receiving terminal still include with the overvoltage protection unit that the second resonance unit is connected, overvoltage protection unit including be used for detecting whether overvoltage detection module and with respectively with overvoltage detection module and the resonance adjustment module that the second resonance unit is connected of the output voltage of receiving terminal.
2. The wireless charging overvoltage protection device according to claim 1, wherein the resonance adjustment module comprises a first switch tube, a second switch tube, a first capacitor and a second capacitor, the first switch tube is connected to the overvoltage detection module, the first capacitor and a ground terminal, the second switch tube is connected to the overvoltage detection module, the second capacitor and the ground terminal, and the first capacitor and the second capacitor are both connected to the second resonance unit.
3. The wireless charging overvoltage protection device of claim 2, wherein the first switching transistor is a first MOS transistor, and the second switching transistor is a second MOS transistor.
4. The wireless charging overvoltage protection device according to claim 2, wherein the overvoltage detection module includes a comparator, a first resistor, a second resistor, a third resistor, and a fourth resistor, an output voltage of the receiving terminal is output to one end of the first resistor, the other end of the first resistor is connected to one ends of the second resistor and the third resistor, respectively, the other end of the second resistor is connected to a ground terminal, the other end of the third resistor is connected to a non-inverting input terminal of the comparator and one end of the fourth resistor, respectively, and the other end of the fourth resistor is connected to an output terminal of the comparator, the first switch tube, and the second switch tube, respectively.
5. The wireless charging overvoltage protection device according to claim 2, wherein the overvoltage detection module comprises an ADC sampler, an MCU controller, a fifth resistor and a sixth resistor, the output voltage of the receiving terminal is output to one end of the fifth resistor, the other end of the fifth resistor is connected to one end of the sixth resistor and the ADC sampler respectively, the other end of the sixth resistor is connected to a ground terminal, the ADC sampler is connected to the MCU controller, and the MCU controller is connected to the first switch tube and the second switch tube.
6. The wireless charging overvoltage protection device according to any one of claims 1 to 5, wherein the first resonance unit is a transmitting end series resonance module, and the second resonance unit comprises a receiving end series resonance module and a rectifying module connected with the receiving end series resonance module.
7. The wireless charging overvoltage protection device as claimed in claim 6, wherein the transmitting terminal series resonance module comprises a transmitting coil, a third switching tube, a fourth switching tube, a third capacitor and a fourth capacitor, the third switching tube is respectively connected to the power terminal, the fourth switching tube, the third capacitor and one end of the transmitting coil, the fourth switching tube is respectively connected to the power terminal and one end of the fourth capacitor, and the other end of the fourth capacitor is connected to the other end of the transmitting coil.
8. The wireless charging overvoltage protection device according to claim 7, wherein the third switching tube is a third MOS tube, and the fourth switching tube is a fourth MOS tube.
9. The wireless charging overvoltage protection device according to claim 6, wherein the receiving end series resonance module comprises a receiving coil and a fifth capacitor, the rectifying module comprises a first diode, a second diode, a third diode, a fourth diode and a sixth capacitor, one end of the receiving coil is connected to one end of the fifth capacitor, the other end of the fifth capacitor is respectively connected to the resonance adjusting unit, the anode of the first diode and the cathode of the third diode, the cathode of the first diode is respectively connected to the cathode of the second diode, one end of the sixth capacitor and the overvoltage detection module, the anode of the second diode is respectively connected to the other end of the receiving coil, the resonance adjusting unit and the cathode of the fourth diode, the anode of the third diode is respectively connected to the anode of the fourth diode and the other end of the sixth capacitor, the sixth capacitor is also connected in parallel with the load end.
10. A wireless charging overvoltage protection system, comprising:
a load end; and
the wireless charging overvoltage protection device of any one of claims 1 to 9;
wherein the load terminal is connected to the second resonance unit.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114465332A (en) * | 2022-04-14 | 2022-05-10 | 珠海智融科技股份有限公司 | Power supply switching system and method for wired charging and wireless charging |
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2021
- 2021-01-28 CN CN202120243078.1U patent/CN212726580U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114465332A (en) * | 2022-04-14 | 2022-05-10 | 珠海智融科技股份有限公司 | Power supply switching system and method for wired charging and wireless charging |
| CN114465332B (en) * | 2022-04-14 | 2022-07-22 | 珠海智融科技股份有限公司 | Power supply switching system and method for wired charging and wireless charging |
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