CN112688382A - Charging circuit, circuit control method and electronic equipment - Google Patents
Charging circuit, circuit control method and electronic equipment Download PDFInfo
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- CN112688382A CN112688382A CN202011478811.4A CN202011478811A CN112688382A CN 112688382 A CN112688382 A CN 112688382A CN 202011478811 A CN202011478811 A CN 202011478811A CN 112688382 A CN112688382 A CN 112688382A
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Abstract
The present disclosure relates to the technical field of electronic devices, and in particular to a charging circuit, a circuit control method, and an electronic device, wherein the charging circuit has a charging mode and an excitation mode, the charging circuit is configured to charge a battery in the charging mode, the charging circuit is configured to excite a flash lamp in the excitation mode, and the charging circuit includes: the device comprises a first coil, a second coil, a boosting unit, a switching unit and a rectifier bridge unit; the second coil is connected with the flashlight and can be coupled with the first coil; the boosting unit is connected with the first coil; the switching unit is respectively connected with the first coil, the second coil and the boosting unit; and the rectifier bridge unit is respectively connected with the switching unit and the battery. The number of devices in the electronic equipment can be saved, and the electronic equipment is light and thin.
Description
Technical Field
The disclosure relates to the technical field of electronic equipment, in particular to a charging circuit, a circuit control method and electronic equipment.
Background
With the development and progress of the technology, people have higher and higher requirements on the functions of mobile communication electronic equipment such as mobile phones, and in order to meet the requirements, a large number of various functional devices are often required to be integrated in the electronic equipment so as to realize richer functions. However, it is not favorable for the miniaturization of the electronic device to install a large number of various functional devices inside the electronic device.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The present disclosure is directed to a charging circuit, a circuit control method, and an electronic device, so as to reduce the number of devices inside the electronic device to at least a certain extent.
According to a first aspect of the present disclosure, there is provided a charging circuit having a charging mode in which the charging circuit is configured to charge a battery and an ignition mode in which the charging circuit is configured to ignite a flash lamp, the charging circuit comprising:
a first coil;
the first end of the second coil is connected with the flash lamp and can be coupled with the first coil;
a booster unit connected to the first coil;
the switching unit is respectively connected with the first coil, the second coil and the boosting unit;
a rectifier bridge unit respectively connected to the switching unit and the battery;
in a charging mode, the switching unit controls the first coil and the rectifier bridge unit to be conducted, and controls the rectifier bridge unit, the boosting unit and the second coil to be turned off, so that the battery is charged through the first coil and the rectifier bridge unit; in the excitation mode, the switching unit controls the rectifier bridge unit to be conducted with the first coil through the voltage boosting unit so as to improve the voltage of the first coil, and controls the flash lamp to be conducted with the rectifier bridge through the second coil so as to excite the flash lamp through the induced voltage of the second coil.
According to a second aspect of the present disclosure, there is provided a control method of a circuit for controlling the charging circuit described above, the control method comprising:
charging the battery using the first coil and the rectifier bridge unit in response to the charge control signal;
and responding to an excitation control signal, providing an alternating current driving signal to the first coil through the rectifier bridge unit and the boosting unit by using the battery, and receiving the alternating current driving signal and driving a flash lamp to emit light by using the second coil.
According to a third aspect of the present disclosure, there is provided an electronic device including the charging circuit described above.
According to the charging circuit provided by the embodiment of the disclosure, in a charging mode, the first coil is used for receiving an alternating current power supply signal, and the battery is charged through the resonant capacitor and the rectifier bridge unit, so that wireless charging of electronic equipment is realized; when the electronic equipment is in an excitation mode, the battery is used for providing an alternating current driving signal to the first coil through the rectifier bridge unit and the boosting unit, and the second coil receives the alternating current driving signal and drives the flash lamp to emit light, so that the flash lamp of the electronic equipment is excited. The wireless charging and flash lamp excitation functions are integrated in the charging circuit, the number of devices in the electronic equipment can be reduced, the electronic equipment is light and thin, and the cost of the electronic equipment is reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The above and other features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 is a schematic diagram of a first charging circuit provided in an exemplary embodiment of the present disclosure;
fig. 2 is a schematic diagram of a second charging circuit provided in an exemplary embodiment of the present disclosure;
fig. 3 is a schematic diagram of a third charging circuit provided in an exemplary embodiment of the present disclosure;
fig. 4 is a schematic diagram of a fourth charging circuit provided in an exemplary embodiment of the present disclosure;
fig. 5 is a schematic diagram of a charging mode of a charging circuit provided in an exemplary embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a charging circuit firing pattern provided by an exemplary embodiment of the present disclosure;
fig. 7 is a schematic diagram of a lighting mode of a charging circuit provided in an exemplary embodiment of the present disclosure;
FIG. 8 is a flow chart of a circuit control method provided in an exemplary embodiment of the present disclosure;
fig. 9 is a schematic view of an electronic device provided in an exemplary embodiment of the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the embodiments of the disclosure can be practiced without one or more of the specific details, or with other methods, components, materials, devices, steps, and so forth. In other instances, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in the form of software, or in one or more software-hardened modules, or in different networks and/or processor devices and/or microcontroller devices.
The electronic device in the embodiment of the present disclosure may be an electronic device with a wireless charging function and a flash lamp, such as a mobile phone, a tablet computer, an electronic book, or a wearable terminal. The flash lamp may be a xenon lamp or the like requiring high voltage excitation. In the related art, the wireless charging circuit and the flash drive circuit in the electronic device are separately provided, which results in a large number of devices in the electronic device.
The disclosed embodiment first provides a charging circuit having a charging mode for charging a battery 110 and an excitation mode for exciting a flash 120, as shown in fig. 1, the charging circuit includes a first coil 210, a second coil 220, a boosting unit 230, a switching unit 240, and a rectifier bridge unit 250; a second coil 220 is connected with the flashlight 120, and the second coil 220 can be coupled with the first coil 210; the boosting unit 230 is connected to the first coil 210; the switching unit 240 is connected to the first coil 210, the second coil 220 and the boosting unit 230, respectively; the rectifier bridge unit 250 connects the switching unit 240 and the battery 110, respectively.
In the charging mode, the switching unit 240 controls the first coil 210 and the rectifier bridge unit 250 to be turned on, and controls the rectifier bridge unit and the boosting unit 230 and the second coil 220 to be turned off, so as to charge the battery 110 through the first coil 210 and the rectifier bridge unit 250; in the excitation mode, the switching unit 240 controls the rectifier bridge unit 250 to be conducted with the first coil 210 through the voltage boosting unit 230 to increase the voltage of the first coil 210, and controls the flash lamp 120 to be conducted with the rectifier bridge through the second coil 220 to excite the flash lamp 120 through the induced voltage of the second coil 220.
The charging circuit provided by the embodiment of the present disclosure, in the charging mode, uses the first coil 210 for receiving an ac power signal, and charges the battery 110 through the resonant capacitor 260 and the rectifier bridge unit 250, thereby implementing wireless charging of the electronic device; in the excitation mode, the battery 110 supplies an ac driving signal to the first coil 210 through the rectifier bridge unit 250 and the voltage boost unit 230, and the second coil 220 receives the ac driving signal and drives the flash lamp 120 to emit light, so that the electronic device flash lamp 120 is excited. The wireless charging and the flash lamp 120 excitation function are integrated in the charging circuit, so that the number of devices in the electronic equipment can be reduced, the electronic equipment is light and thin, and the cost of the electronic equipment is reduced.
Further, as shown in fig. 2, the charging circuit further includes a resonant capacitor 260 having a first end connected to the rectifier bridge unit 250 and a second end connected to the first end of the first coil 210. The resonant capacitor 260 and the first coil 210 form an LLC resonant circuit.
On this basis, as shown in fig. 4, the switching unit 240 includes: a first switching unit 241, a second switching unit 242, and a third switching unit 243. The first switching unit 241 is connected to the rectifier bridge unit 250 and the second end of the first coil 210, respectively; the second switching unit 242 connects the flash 120 and the rectifying bridge unit 250; the third switching unit 243 is connected to the first terminal of the resonance capacitor 260, the second terminal of the resonance capacitor 260, and the second terminal of the second coil 220, respectively;
in the charging mode, the first switching unit 241 is turned on, the second switching unit 242 and the third switching unit 243 are turned off, and the first coil 210 is configured to receive an ac power signal and charge the battery 110 through the resonant capacitor 260 and the rectifier bridge unit 250; in the excitation mode, the first switching unit 241 is turned off, the second switching unit 242 and the third switching unit 243 are turned on, the battery 110 provides an ac driving signal to the first coil 210 through the rectifier bridge unit 250 and the boosting unit 230, and the second coil 220 receives the ac driving signal and drives the flash lamp 120 to emit light.
When in the charging mode, the first switching unit 241 is turned on, the second switching unit 242 and the third switching unit 243 are turned off, and the first coil 210 is used for receiving an alternating current power supply signal and charging the battery 110 through the resonant capacitor 260 and the rectifier bridge unit 250, so that wireless charging of the electronic device is realized; when in the ignition mode, the first switching unit 241 is turned off, the second switching unit 242 and the third switching unit 243 are turned on, the battery 110 provides an ac driving signal to the first coil 210 through the rectifier bridge unit 250 and the boosting unit 230, and the second coil 220 receives the ac driving signal and drives the flash 120 to emit light, so that the electronic device flash 120 is ignited. The wireless charging and the flash lamp 120 excitation function are integrated in the charging circuit, so that the number of devices in the electronic equipment can be reduced, the electronic equipment is light and thin, and the cost of the electronic equipment is reduced.
Further, as shown in fig. 3, the charging circuit provided in the embodiment of the present disclosure may further include a voltage stabilizing unit 270 and a voltage regulating unit 280, one end of the voltage stabilizing unit 270 is connected to the rectifier bridge unit 250, the other end of the voltage stabilizing unit 270 is connected to the voltage regulating unit 280, and the voltage regulating unit 280 is connected to the battery 110. The voltage stabilizing unit 270 is used for filtering out a voltage ripple of a signal output by the rectifier bridge unit 250 in the charging mode. The voltage regulating unit 280 is used for reducing the voltage of the signal transmitted by the rectifier bridge unit 250 in the charging phase and increasing the voltage output by the battery 110 in the excitation phase. In the charging mode, the voltage regulating unit 280 can allow the voltage applied to the first coil 210 to be larger, so as to reduce the current on the first coil 210, and reduce the heat generation and energy consumption of the first coil 210. During the ignition phase, the voltage regulating unit 280 boosts the voltage of the signal output from the battery 110, which is beneficial to the ignition of the flash lamp 120.
The following will describe each part of the charging circuit provided by the embodiment of the present disclosure in detail:
the first coil 210 may be a wireless charging receiving coil, and the first coil 210 may be coupled to a coil in a wireless charging base when in a charging mode. The coil in the wireless charging base converts the power signal into an electromagnetic signal, and the first coil 210 receives the electromagnetic signal and converts the electromagnetic signal into an electrical signal. First coil 210 and resonance capacitor 260 are connected, and during the mode of charging, first coil 210 and resonance capacitor 260 form LLC resonant circuit, can realize 110kHz ~ 148 kHz's stable resonance, when wireless charging base end coil has alternating current and is close to with first coil 210, can be at first coil 210 electromagnetic induction play alternating current.
The rectifier bridge unit 250 may include: the first MOS transistor M1, the second MOS transistor M2, the third MOS transistor M3 and the fourth MOS transistor M4, the first end of the first MOS transistor M1 is connected with the battery 110, and the second end of the first MOS transistor M1 is connected with a first node; a first end of the second MOS transistor M2 is connected to the battery 110, and a second end of the second MOS transistor M2 is connected to the second node; a first end of the third MOS transistor M3 is connected with the third node, and a second end of the third MOS transistor M3 is connected with the first node; a first end of the fourth MOS transistor M4 is connected with the third node, and a second end of the fourth MOS transistor M4 is connected with the second node;
a second terminal of the resonant capacitor 260 is connected to the first node, the first and second switching units 241 and 242 are connected to the second node, and the third node may be grounded.
In the charging mode, the first MOS transistor M1, the second MOS transistor M2, the third MOS transistor M3, and the fourth MOS transistor M4 are all turned on under the control of the control signal, forming a full-bridge rectifier circuit, through which the ac signal induced by the first coil 210 can be converted into the dc signal.
In the excitation mode, the rectifier bridge unit 250 may serve as an inverter for the battery 110, and convert the dc signal driving signal output by the battery 110 into an ac driving signal. For example, the first MOS transistor M1 and the fourth MOS transistor M4 are turned on, the second MOS transistor M2 and the third MOS transistor M3 are turned off in the first period, and the first MOS transistor M1 and the fourth MOS transistor M4 are turned off, and the second MOS transistor M2 and the third MOS transistor M3 are turned on in the second period. The dc signal driving signal output from the battery 110 is converted into an ac driving signal by the first period and the second period alternately occurring.
The third switching unit 243 may include a first switch Q1, a second switch Q2, and a third switch Q3, a second terminal of the first switch Q1 being connected to the second terminal of the resonant capacitor 260, a first terminal of the first switch Q1 being connected to the second terminal of the third switch Q3; a first terminal of the second switch Q2 is connected to a second terminal of the third switch Q3, and a second terminal of the second switch Q2 is connected to a second terminal of the second coil 220. A first terminal of the third switch Q3 is connected to the first node.
The first switch Q1, the second switch Q2 and the third switch Q3 may be MOS transistors, or devices having switching functions such as a relay and a load switch.
In the charge mode, the first, second, and third switches Q1, Q2, and Q3 are off, and in the fire mode, the first, second, and third switches Q1, Q2, and Q3 are on.
The charging circuit also has a light-emitting mode in which the charging circuit is used to drive the flash 120 to continuously emit light, the first switch unit 241 is turned off, the second switch unit 242 is turned on, the first switch Q1 is turned off, and the second switch Q2 and the third switch Q3 are turned on.
The first switching unit 241 may include a fourth switch Q4 and a fifth switch Q5, the fourth switch Q4 and the fifth switch Q5 are connected in series, and the fourth switch Q4 is connected to the second end of the first coil 210 and the fifth switch Q5 is connected to the second node.
The fourth switch Q4 and the fifth switch Q5 are turned on in the charging mode, the fourth switch Q4 and the fifth switch Q5 are turned off in the firing mode, and the fourth switch Q4 and the fifth switch Q5 are turned off in the lighting mode.
The second switching unit 242 may include a sixth switch Q6 and a seventh switch Q7, the sixth switch Q6 and the seventh switch Q7 being connected in series, the flash 120 being connected to the sixth switch Q6, and the seventh switch Q7 being connected to the second node.
The sixth switch Q6 and the seventh switch Q7 are turned off in the charging mode, the sixth switch Q6 and the seventh switch Q7 are turned on in the firing mode, and the sixth switch Q6 and the seventh switch Q7 are turned on in the lighting mode.
The fourth switch Q4, the fifth switch Q5, the sixth switch Q6 and the seventh switch Q7 may be MOS transistors, or devices having a switching function, such as a relay and a load switch.
The boosting unit 230 includes: the circuit comprises a first resistor R1, a second resistor R2, a first diode D1, a second diode D2, a diac VD1, a first capacitor C1 and a second capacitor C2. A first end of the first resistor R1 is connected to the rectifier bridge unit 250 (second node); the input terminal of the first diode D1 is connected to the third switching unit 243; the input end of the second diode D2 is connected with the output end of the first diode D1; a first end of the diac VD1 is connected to the output end of the second diode D2, and a second end of the diac VD1 is connected to the second end of the first coil 210; a first end of the second resistor R2 is connected with the input end of the first diode D1, and a second end of the second resistor R2 is connected with the output end of the second diode D2; a first end of the first capacitor C1 is connected to a second end of the first resistor R1, and a second end of the first capacitor C1 is connected to an output end of the first diode D1; a first terminal of the second capacitor C2 is connected to the input terminal of the first diode D1, and a second terminal of the second capacitor C2 is connected to the output terminal of the second diode D2.
In the excitation phase, the first switch Q1, the second switch Q2 and the third switch Q3 are turned on, and the voltage boosting unit 230 is used for performing bootstrap voltage boosting on the signal output by the rectifier bridge unit 250. The rectifier bridge unit 250 outputs an ac signal, and when the first capacitor C1 has a low level at the end of the first resistor R1 and the anode of the first diode D1 has a high level, the voltage output from the rectifier bridge unit 250 is written into the first capacitor C1. When the first capacitor C1 is at a high level and the anode of the first diode D1 is at a low level, the voltage of the first capacitor C1 is raised and charged to the second capacitor C2, and the voltage of the second capacitor C2 is gradually boosted. When the voltage of the second capacitor C2 rises to a certain degree, the diac VD1 is broken down and conducted, and the charge stored in the second capacitor C2 is transferred to the first coil 210.
The flash lamp 120 is connected to the second coil 220, and since the flash lamp 120 is a xenon lamp, a higher voltage is required for excitation. In the excitation mode, the first coil 210 and the second coil 220 are coupled to form a transformer. The number of turns of the second coil 220 is greater than that of the first coil 210, so that the voltage output by the second coil 220 is greater than that of the first coil 210, and the voltage is increased again to excite the flash lamp 120.
The voltage stabilizing unit 270 is disposed between the rectifier bridge unit 250 and the voltage regulating unit 280, and the voltage stabilizing unit 270 operates when the charging circuit operates in the charging mode. The voltage stabilizing unit 270 may include a low dropout linear regulator (LDO) for filtering out a voltage ripple of the signal output from the rectifier bridge unit 250.
The voltage regulating unit 280 may include a charge pump voltage regulating circuit, which is respectively connected to the battery 110 and the voltage stabilizing unit 270, and is configured to step down a signal transmitted by the rectifier bridge unit 250 during a charging phase and step up a voltage output by the battery 110 during an excitation phase and a light emitting phase. Of course, in practical applications, the voltage regulating unit 280 may also be other DC-DC voltage regulating circuits, such as a boost circuit.
It should be noted that, in the embodiment of the present disclosure, each MOS transistor has a first end and a second end, where the first end may be a source of the MOS transistor, and the second end may be a drain of the MOS transistor; or the first end can be the drain electrode of the MOS tube, and the second end can be the source electrode of the MOS tube. Each MOS tube also comprises a control end which can be a grid electrode of the MOS tube. The control end receives the control signal and further controls the corresponding MOS tube to be conducted. Each MOS tube can be an N-type MOS tube, a P-type MOS tube, a CMOS or the like.
As shown in fig. 4, the battery 110 is connected to the voltage regulating unit 280, the voltage regulating unit 280 is connected to the voltage stabilizing unit 270, the voltage stabilizing unit 270 is connected to a first end of the first MOS transistor M1, and a second end of the first MOS transistor M1 is connected to the first node; a first end of the second MOS transistor M2 is connected to the voltage regulator unit 270, and a second end of the second MOS transistor M2 is connected to the second node; a first end of the third MOS transistor M3 is connected with the third node, and a second end of the third MOS transistor M3 is connected with the first node; the first end of the fourth MOS transistor M4 is connected to the third node, and the second end of the fourth MOS transistor M4 is connected to the second node. A first terminal of the resonant capacitor 260 is connected to the first terminal of the first coil 210, and a second terminal of the resonant capacitor 260 is connected to the rectifier bridge unit 250. The third switch Q3 has a first terminal connected to the second terminal of the resonant capacitor 260, a second terminal connected to the second terminal of the first switch Q1 and the first terminal of the second switch Q2, a first terminal of the first switch Q1 connected to the first terminal of the resonant capacitor 260, and a second terminal of the second switch Q2 connected to the second terminal of the second coil 220. A first end of the first resistor R1 is connected with a second node; the input end of the first diode D1 is connected with the second end of the second switch Q2; the input end of the second diode D2 is connected with the output end of the first diode D1; the output end of a second diode D2 is connected to the first end of the trigger diode, and the second end is connected to the second end of the first coil 210; the first end of the second resistor R2 is connected with the input end of the first diode D1, and the second end is connected with the output end of the second diode D2; the first end of the first capacitor C1 is connected with the second end of the first resistor R1, and the second end is connected with the output end of the first diode D1; the second capacitor C2 has a first terminal connected to the input terminal of the first diode D1 and a second terminal connected to the output terminal of the second diode D2. A first terminal of the fourth switch Q4 is connected to the second terminal of the first coil 210, a second terminal of the fourth switch Q4 is connected to a first terminal of the fifth switch Q5, and a second terminal of the fifth switch Q5 is connected to the second node. A first terminal of a sixth switch Q6 is connected to flash 120, a second terminal of the sixth switch Q6 is connected to a first terminal of a seventh switch Q7, and a second terminal of the seventh switch Q7 is connected to the second node.
In the charging phase, as shown in fig. 5, the control signal controls the fourth switch Q4 and the fifth switch Q5 to be turned on, and the first switch Q1, the second switch Q2, the third switch Q3, the sixth switch Q6 and the seventh switch Q7 to be turned off. The first MOS to fourth MOS transistor M4 in the rectifier bridge unit 250 are turned on to form a rectifier circuit. The first coil 210 generates an ac power signal in response to an electromagnetic signal transmitted by the wireless charging base. After passing through the resonant capacitor 260, the ac signal enters a rectifying circuit, the rectifying circuit converts the ac signal into a dc signal, and the dc signal is charged to the battery 110 after passing through the voltage stabilization unit 270 and the voltage boosting unit 280.
In the excitation stage, as shown in fig. 6, the control signal controls the fourth switch Q4 and the fifth switch Q5 to turn off, the first switch Q1, the second switch Q2, the third switch Q3, the sixth switch Q6 and the seventh switch Q7 to turn on, the battery 110 outputs a dc driving signal, the dc driving signal is boosted once after passing through the voltage regulating unit 280, and the rectifier bridge unit 250 serves as an inverter to convert the dc signal into an ac signal. The first MOS transistor M1 and the fourth MOS transistor M4 are conducted, the second MOS transistor M2 and the third MOS transistor M3 are turned off in the first time period, the first MOS transistor M1 and the fourth MOS transistor M4 are turned off in the second time period, and the second MOS transistor M2 and the third MOS transistor M3 are conducted. The dc signal driving signal output from the battery 110 is converted into an ac driving signal by the first period and the second period alternately occurring. The ac signal is bootstrapped by the voltage boost unit 230, and when the first capacitor C1 is at a low level at the end of the first resistor R1 and the anode of the first diode D1 is at a high level, the voltage output by the rectifier bridge unit 250 is written into the first capacitor C1. When the first capacitor C1 is at a high level and the anode of the first diode D1 is at a low level, the voltage of the first capacitor C1 is raised and charged to the second capacitor C2, and the voltage of the second capacitor C2 is gradually boosted. When the voltage of the second capacitor C2 rises to a certain degree, the diac is broken down and turned on, the charge stored in the second capacitor C2 is transferred to the first coil 210, and the first coil 210 emits an electromagnetic signal. The second coil 220 obtains a high voltage alternating current in response to the electromagnetic signal of the first coil 210, thereby exciting the flash lamp 120.
In the light emitting stage, as shown in fig. 7, in some application scenarios, the flash lamp 120 is required to continuously emit light, and the voltage requirement for continuous light emission of the flash lamp 120 is smaller than the excitation voltage, at this time, the rectifier bridge unit 250 may be switched by the switching unit 240 to directly increase the alternating current to the flash lamp 120. The control signal controls the first switch Q1, the fourth switch Q4 and the fifth switch Q5 to be turned off, and the second switch Q2, the third switch Q3, the sixth switch Q6 and the seventh switch Q7 to be turned on. The ac signal transmitted from the rectifier bridge unit 250 is applied to the flash lamp 120 through the second coil 220, and the flash lamp 120 is maintained to emit light continuously. In the light-emitting stage, the voltage power supply lower than that in the excitation stage is realized through the first switch, so that the electric energy can be saved on one hand, and the service life of the flash lamp can be prolonged on the other hand.
The charging circuit provided by the embodiment of the present disclosure, in the charging mode, uses the first coil 210 for receiving an ac power signal, and charges the battery 110 through the resonant capacitor 260 and the rectifier bridge unit 250, thereby implementing wireless charging of the electronic device; in the excitation mode, the battery 110 supplies an ac driving signal to the first coil 210 through the rectifier bridge unit 250 and the voltage boost unit 230, and the second coil 220 receives the ac driving signal and drives the flash lamp 120 to emit light, so that the electronic device flash lamp 120 is excited. The wireless charging and the flash lamp 120 excitation function are integrated in the charging circuit, so that the number of devices in the electronic equipment can be reduced, the electronic equipment is light and thin, and the cost of the electronic equipment is reduced.
The exemplary embodiment of the present disclosure also provides a control method of a circuit, which is used for controlling the charging circuit described above, as shown in fig. 8, the control method may include the following steps:
step S810, in response to the charging control signal, charging the battery by using the first coil and the rectifier bridge unit;
in response to the excitation control signal, the ac driving signal is supplied to the first coil through the rectifier bridge unit 250 and the boosting unit using the battery, and the ac driving signal is received and the flash 120 is driven to emit light using the second coil in step S820.
In the charging circuit control method provided by the embodiment of the present disclosure, in the charging mode, the first coil 210 is controlled to receive an ac power signal, and the battery 110 is charged through the resonant capacitor 260 and the rectifier bridge unit 250, so that wireless charging of the electronic device is realized; in the excitation mode, the control battery 110 provides an ac driving signal to the first coil 210 through the rectifier bridge unit 250 and the voltage boost unit 230, and the second coil 220 receives the ac driving signal and drives the flash lamp 120 to emit light, so that the electronic device flash lamp 120 is excited. The wireless charging and the flash lamp 120 excitation function are integrated in the charging circuit, so that the number of devices in the electronic equipment can be reduced, the electronic equipment is light and thin, and the cost of the electronic equipment is reduced.
In step S810, the battery 110 may be charged using the first coil 210 and the rectifier bridge unit 250 in response to the charging control signal.
The charging control signal may control the fourth switch Q4 and the fifth switch Q5 to be turned on, and the first switch Q1, the second switch Q2, the third switch Q3, the sixth switch Q6 and the seventh switch Q7 to be turned off. The first MOS to fourth MOS transistor M4 in the rectifier bridge unit 250 are turned on to form a rectifier circuit. The first coil 210 generates an ac power signal in response to an electromagnetic signal transmitted by the wireless charging base. After passing through the resonant capacitor 260, the ac signal enters a rectifying circuit, the rectifying circuit converts the ac signal into a dc signal, and the dc signal is charged to the battery 110 after passing through the voltage stabilization unit 270 and the voltage boosting unit 280.
In step S820, an ac driving signal may be provided to the first coil 210 through the rectifier bridge unit 250 and the boosting unit 230 using the battery 110 in response to the excitation control signal, and the second coil 220 may receive the ac driving signal and drive the flash lamp 120 to emit light.
The excitation control signal can control the fourth switch Q4 and the fifth switch Q5 to be turned off, the first switch Q1, the second switch Q2, the third switch Q3, the sixth switch Q6 and the seventh switch Q7 to be turned on, the battery 110 outputs a direct current driving signal, the voltage is boosted once after passing through the voltage regulating unit 280, and at this time, the rectifier bridge unit 250 serves as an inverter to convert the direct current signal into an alternating current signal. The first MOS transistor M1 and the fourth MOS transistor M4 are conducted, the second MOS transistor M2 and the third MOS transistor M3 are turned off in the first time period, the first MOS transistor M1 and the fourth MOS transistor M4 are turned off in the second time period, and the second MOS transistor M2 and the third MOS transistor M3 are conducted. The dc signal driving signal output from the battery 110 is converted into an ac driving signal by the first period and the second period alternately occurring. The ac signal is bootstrapped by the voltage boost unit 230, and when the first capacitor C1 is at a low level at the end of the first resistor R1 and the anode of the first diode D1 is at a high level, the voltage output by the rectifier bridge unit 250 is written into the first capacitor C1. When the first capacitor C1 is at a high level and the anode of the first diode D1 is at a low level, the voltage of the first capacitor C1 is raised and charged to the second capacitor C2, and the voltage of the second capacitor C2 is gradually boosted. When the voltage of the second capacitor C2 rises to a certain degree, the diac is broken down and turned on, the charge stored in the second capacitor C2 is transferred to the first coil 210, and the first coil 210 emits an electromagnetic signal. The second coil 220 obtains a high voltage alternating current in response to the electromagnetic signal of the first coil 210, thereby exciting the flash lamp 120.
Further, the control method of the circuit provided by the embodiment of the present disclosure may further include: in response to the light emission control signal, power is continuously supplied to the flash 120 using the battery 110 and the rectifier bridge unit 250 and the second coil 220.
In some application scenarios, the flash lamp 120 is required to continuously emit light, and the voltage requirement for continuous emission of the flash lamp 120 is smaller than the excitation voltage, and at this time, the switching unit 240 may switch the rectifier bridge unit 250 to directly increase the ac power to the flash lamp 120. The control signal controls the first switch Q1, the fourth switch Q4 and the fifth switch Q5 to be turned off, and the second switch Q2, the third switch Q3, the sixth switch Q6 and the seventh switch Q7 to be turned on. The ac signal transmitted from the rectifier bridge unit 250 is applied to the flash lamp 120 through the second coil 220, and the flash lamp 120 is maintained to emit light continuously.
It should be noted that although the various steps of the methods of the present disclosure are depicted in the drawings in a particular order, this does not require or imply that these steps must be performed in this particular order, or that all of the depicted steps must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions, etc.
The exemplary embodiment of the present disclosure also provides an electronic device, as shown in fig. 9, which includes the charging circuit 200 thereon. The charging circuit 200 has a charging mode in which the charging circuit is used to charge the battery 110 and an ignition mode in which the charging circuit is used to ignite the flash lamp 120, and the charging circuit 200 includes a first coil 210, a second coil 220, a boosting unit 230, a switching unit 240, and a rectifying bridge unit 250; a second coil 220 is connected with the flashlight 120, and the second coil 220 can be coupled with the first coil 210; the boosting unit 230 is connected to the first coil 210; the switching unit 240 is connected to the first coil 210, the second coil 220 and the boosting unit 230, respectively; the rectifier bridge unit 250 connects the switching unit 240 and the battery 110, respectively.
In the charging mode, the switching unit 240 controls the first coil 210 and the rectifier bridge unit 250 to be turned on, and controls the rectifier bridge unit and the boosting unit 230 and the second coil 220 to be turned off, so as to charge the battery 110 through the first coil 210 and the rectifier bridge unit 250; in the excitation mode, the switching unit 240 controls the rectifier bridge unit 250 to be conducted with the first coil 210 through the voltage boosting unit 230 to increase the voltage of the first coil 210, and controls the flash lamp 120 to be conducted with the rectifier bridge through the second coil 220 to excite the flash lamp 120 through the induced voltage of the second coil 220.
According to the electronic device provided by the embodiment of the disclosure, in the charging mode, the first coil 210 is used for receiving an alternating current power supply signal, and the battery 110 is charged through the resonant capacitor 260 and the rectifier bridge unit 250, so that wireless charging of the electronic device is realized; in the excitation mode, the battery 110 supplies an ac driving signal to the first coil 210 through the rectifier bridge unit 250 and the voltage boost unit 230, and the second coil 220 receives the ac driving signal and drives the flash lamp 120 to emit light, so that the electronic device flash lamp 120 is excited. The wireless charging and the flash lamp 120 excitation function are integrated in the charging circuit, so that the number of devices in the electronic equipment can be reduced, the electronic equipment is light and thin, and the cost of the electronic equipment is reduced.
The electronic device in the embodiment of the present disclosure may be an electronic device with a wireless charging function and a flash lamp, such as a mobile phone, a tablet computer, an electronic book, or a wearable terminal. The following description will be given taking an electronic device as a mobile phone as an example.
The electronic device may further include a display screen 10, a middle frame 20, a main board 30, a battery 110, and the like, where the display screen 10, the middle frame 20, and the rear cover 50 form an accommodating space for accommodating other electronic components or functional modules of the electronic device. Meanwhile, the display screen 10 forms a display surface of the electronic device for displaying information such as images, texts, and the like. The Display screen 10 may be a Liquid Crystal Display (LCD) or an Organic Light-Emitting Diode (OLED) Display screen.
A glass cover may be provided over the display screen 10. Wherein, the glass cover plate can cover the display screen 10 to protect the display screen 10 and prevent the display screen 10 from being scratched or damaged by water.
The display screen 10 may include a display area as well as a non-display area. Wherein the display area performs the display function of the display screen 10 for displaying information such as images, text, etc. The non-display area does not display information. The non-display area can be used for arranging functional modules such as a camera, a receiver, a proximity sensor and the like. In some embodiments, the non-display area may include at least one area located at an upper portion and a lower portion of the display area.
The display screen 10 may be a full-face screen. At this time, the display screen 10 may display information in a full screen, so that the electronic apparatus has a large screen occupation ratio. The display screen 10 includes only display areas and no non-display areas.
The middle frame 20 may be a hollow frame structure. The material of the middle frame 20 may include metal or plastic. The main board 30 is mounted inside the receiving space. For example, the main board 30 may be mounted on the middle frame 20 and be received in the receiving space together with the middle frame 20. The main board 30 is provided with a grounding point to realize grounding of the main board 30.
One or more of the functional modules such as a motor, a microphone, a speaker, a receiver, an earphone interface, a universal serial bus interface (USB interface), a proximity sensor, an ambient light sensor, a gyroscope, and a processor may be integrated on the main board 30. Meanwhile, the display screen 10 may be electrically connected to the main board 30. The charging circuit can be arranged on the main board, or the electronic device can further comprise a secondary circuit board, and the charging circuit is arranged on the secondary circuit board.
Wherein, the sensor module can include degree of depth sensor, pressure sensor, gyroscope sensor, baroceptor, magnetic sensor, acceleration sensor, distance sensor, be close optical sensor, fingerprint sensor, temperature sensor, touch sensor, ambient light sensor and bone conduction sensor etc.. The Processor may include an Application Processor (AP), a modem Processor, a Graphics Processing Unit (GPU), an Image Signal Processor (ISP), a controller, a video codec, a Digital Signal Processor (DSP), a baseband Processor, and/or a Neural Network Processor (NPU), and the like. The different processing units may be separate devices or may be integrated into one or more processors.
The main board 30 is also provided with a display control circuit. The display control circuit outputs an electric signal to the display screen 10 to control the display screen 10 to display information. The light emitting control unit and the color change control unit may be provided on the main board.
The battery 110 is mounted inside the receiving space. For example, the battery 110 may be mounted on the middle frame 20 and received in the receiving space together with the middle frame 20. The battery 110 may be electrically connected to the motherboard 30 to enable the battery 110 to power the electronic device. The main board 30 may be provided with a power management circuit. The power management circuit is used to distribute the voltage provided by the battery 110 to the various electronic components in the electronic device.
The rear cover 50 serves to form an outer contour of the electronic apparatus. The rear cover 50 may be integrally formed. In the forming process of the rear cover 50, a rear camera hole, a fingerprint identification module mounting hole and the like can be formed in the rear cover 50. The camera assembly 10 may be provided on a main board and a center frame, and the camera assembly 10 receives light from the rear camera hole. The flash 210 may be provided to the main board or the bezel and exposed to the rear cover 50.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is to be limited only by the terms of the appended claims.
Claims (13)
1. A charging circuit having a charging mode in which the charging circuit is configured to charge a battery and an ignition mode in which the charging circuit is configured to ignite a flash lamp, the charging circuit comprising:
a first coil;
the second coil is connected with the flash lamp and can be coupled with the first coil;
a booster unit connected to the first coil;
the switching unit is respectively connected with the first coil, the second coil and the boosting unit;
a rectifier bridge unit respectively connected to the switching unit and the battery;
in a charging mode, the switching unit enables the first coil and the rectifier bridge unit to be conducted, and enables the rectifier bridge unit, the boosting unit and the second coil to be turned off, so that the battery is charged through the first coil and the rectifier bridge unit; in the excitation mode, the switching unit enables the rectifier bridge unit to be conducted with the first coil through the voltage boosting unit so as to improve the voltage of the first coil and excite the flash lamp through the induced voltage of the second coil.
2. The charging circuit of claim 1, further comprising:
and the resonant capacitor is connected between the first end of the first coil and the rectifier bridge unit.
3. The charging circuit according to claim 2, wherein the switching unit includes:
the first switch unit is respectively connected with the rectifier bridge unit and the second end of the first coil;
a second switch unit connecting the flash lamp and the rectifier bridge unit;
a third switching unit respectively connected to a first terminal of the resonance capacitor, a second terminal of the resonance capacitor, and a second terminal of the second coil;
in a charging mode, the first switch unit is turned on, the second switch unit and the third switch unit are turned off, and the first coil is used for receiving an alternating current power supply signal and charging the battery through the resonant capacitor and the rectifier bridge unit; when the flash lamp is in an excitation mode, the first switch unit is turned off, the second switch unit and the third switch unit are turned on, the battery provides an alternating current driving signal for the first coil through the rectifier bridge unit and the boosting unit, and the second coil receives the alternating current driving signal and drives the flash lamp to emit light.
4. The charging circuit of claim 3, wherein the boost unit comprises:
the first end of the first resistor is connected with the rectifier bridge unit;
the input end of the first diode is connected with the third switching unit;
the input end of the second diode is connected with the output end of the first diode;
the first end of the bidirectional trigger diode is connected with the output end of the second diode, and the second end of the bidirectional trigger diode is connected with the second end of the first coil;
the first end of the second resistor is connected with the input end of the first diode, and the second end of the second resistor is connected with the output end of the second diode;
the first end of the first capacitor is connected with the second end of the first resistor, and the second end of the first capacitor is connected with the output end of the first diode;
and the first end of the second capacitor is connected with the input end of the first diode, and the second end of the second capacitor is connected with the output end of the second diode.
5. The charging circuit of claim 3, wherein the third switching unit comprises:
a first switch, wherein a first end of the first switch is connected with a first end of the resonant capacitor, and a second end of the first switch is connected with a second end of the resonant capacitor;
and the first end of the second switch is connected with the first end of the resonant capacitor, and the second end of the second switch is connected with the second end of the second coil.
6. The charging circuit of claim 5, wherein the third switching circuit further comprises:
and a first end of the third switch is connected with the first end of the resonant capacitor, and a second end of the third switch is respectively connected with the second end of the first switch and the first end of the second switch.
7. The charging circuit of claim 5, further comprising a light-emitting mode, wherein the charging circuit is configured to drive the flash to emit light continuously, the first switch unit is turned off, the second switch unit is turned on, the first switch is turned off, and the second switch is turned on.
8. The charging circuit of claim 1, wherein the second coil has a greater number of turns than the first coil.
9. The charging circuit of claim 1, wherein the rectifier bridge unit comprises:
the first end of the first MOS tube is connected with the battery, and the second end of the first MOS tube is connected with a first node;
the first end of the second MOS tube is connected with the battery, and the second end of the second MOS tube is connected with a second node;
a first end of the third MOS tube is connected with a third node, and a second end of the third MOS tube is connected with the first node;
a first end of the fourth MOS tube is connected with the third node, and a second end of the fourth MOS tube is connected with the second node;
the second end of the resonant capacitor is connected with the first node, and the first switch unit and the second switch unit are connected with the second node.
10. The charging circuit of claim 1, further comprising:
and the voltage stabilizing unit is arranged between the rectifier bridge unit and the battery.
11. The charging circuit of claim 1, further comprising:
the voltage regulating unit is arranged between the rectifier bridge unit and the battery and used for reducing the voltage of the signal transmitted by the rectifier bridge unit in the charging stage and increasing the voltage output by the battery in the excitation stage.
12. A method for controlling a charging circuit according to any one of claims 1 to 11, the method comprising:
charging the battery using the first coil and the rectifier bridge unit in response to the charge control signal;
and responding to an excitation control signal, providing an alternating current driving signal to the first coil through the rectifier bridge unit and the boosting unit by using the battery, and receiving the alternating current driving signal and driving a flash lamp to emit light by using the second coil.
13. An electronic device, characterized in that the electronic device comprises a charging circuit according to any of claims 1-12.
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| CN202011478811.4A CN112688382B (en) | 2020-12-15 | 2020-12-15 | Charging circuit, circuit control method and electronic equipment |
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| CN202011478811.4A CN112688382B (en) | 2020-12-15 | 2020-12-15 | Charging circuit, circuit control method and electronic equipment |
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