CN108347159B - Wireless driving power supply - Google Patents
Wireless driving power supply Download PDFInfo
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- CN108347159B CN108347159B CN201810186176.9A CN201810186176A CN108347159B CN 108347159 B CN108347159 B CN 108347159B CN 201810186176 A CN201810186176 A CN 201810186176A CN 108347159 B CN108347159 B CN 108347159B
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- 238000005070 sampling Methods 0.000 claims abstract description 29
- 230000008878 coupling Effects 0.000 claims description 27
- 238000010168 coupling process Methods 0.000 claims description 27
- 238000005859 coupling reaction Methods 0.000 claims description 27
- 230000005674 electromagnetic induction Effects 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000005672 electromagnetic field Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 208000031361 Hiccup Diseases 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
- H02M1/092—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices the control signals being transmitted optically
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a wireless driving power supply, which comprises a power loop and a control loop; the power loop comprises a power input side circuit and an output side circuit; the power input side circuit is connected with an external voltage source, a pulse signal source and the input end of the power output side circuit; the output end of the power output side circuit is connected with an external charging device; the control loop comprises a sampling circuit and a signal control circuit; the input end of the sampling circuit is connected with the output end of the power output side circuit; the signal control circuit is connected with the output end of the sampling circuit and the pulse signal source. The invention can distinguish the control loop from the power loop, which is used for reducing the complexity of the circuit and avoiding the components of the control signal in the output voltage or current waveform.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a wireless driving power supply.
Background
The wireless driving power supply is widely applied to occasions such as wireless chargers. The power of the wireless driving power supply is transmitted from the input side to the output side through two coupling coils, and the output control of the voltage or the current is realized by multiplexing the two coupling coils.
However, in the conventional wireless driving power supply, in the uninterrupted working process, the control circuit at the input and output sides is a closed loop circuit which is not in electrical contact with any electric component, but because the control signals at the input and output sides are superimposed on the power circuit formed by the two coupling coils, the control signals are required to be extracted by the signal extraction circuit.
The inventors have found that the above-described wireless drive power supply, which superimposes the control loop and the power loop portions together, not only complicates the overall circuit, but also causes the output voltage or current waveform to have a component of the control signal.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a wireless driving power supply, which not only can distinguish a control loop from a power loop so as to reduce the complexity of a circuit, but also can avoid the existence of control signal components in the output voltage or current waveform.
In order to solve the technical problems, an embodiment of the present invention provides a wireless driving power supply, including a power loop and a control loop; wherein,,
the power loop comprises a power input side circuit and a power output side circuit; the power input side circuit comprises a first input end, a second input end, a power output side circuit and a power output side circuit, wherein the first input end of the power input side circuit is connected with an external voltage source, the second input end of the power input side circuit is connected with a pulse signal source with variable signal frequency, the output end of the power input side circuit is connected with the input end of the power output side circuit through electromagnetic induction, and the power input side circuit is used for generating corresponding electric energy according to the signal frequency of the pulse signal source and transmitting the electric energy to the power output side circuit; the output end of the power output side circuit is connected with an external charging device and is used for transmitting the electric energy to the external charging device for supplying power;
the control loop comprises a sampling circuit and a signal control circuit; the input end of the sampling circuit is connected with the output end of the power output side circuit and is used for sensing the voltage and/or current output by the power output side circuit; the input end of the signal control circuit is connected with the output end of the sampling circuit, the output end of the signal control circuit is connected with the pulse signal source and is used for identifying the voltage and/or current induced by the sampling circuit and adjusting the signal frequency of the pulse signal source according to the identified voltage and/or current, so that the signal frequency of the pulse signal source changes within a constant range and the output voltage or current of the power output side circuit can be controlled to be maintained at a corresponding preset value.
The power input side circuit comprises an LC resonance circuit formed by a first coupling coil and a first capacitor and a driving circuit connected with the LC resonance circuit and driving the LC resonance circuit;
the power output side circuit comprises a second coupling coil, one end of which is connected with the first coupling coil to realize electromagnetic induction, and a first diode rectifier bridge or an MOS tube synchronous rectifier circuit, wherein the first diode rectifier bridge or the MOS tube synchronous rectifier circuit is connected with the other end of the second coupling coil.
The driving circuit in the power input side circuit is one of a symmetrical half-bridge circuit, an asymmetrical half-bridge circuit and a full-bridge circuit.
The asymmetric half-bridge circuit comprises a half-bridge driving chip, a second diode rectifier bridge, a first MOS tube and a second MOS tube; wherein,,
the half-bridge driving chip is connected with the pulse signal source, the grid electrode of the first MOS tube and the grid electrode of the second MOS tube;
the drain electrode of the first MOS tube is connected with the external voltage source through the second diode rectifier bridge, and the source electrode is connected with the drain electrode of the second MOS tube and one end of the LC resonance circuit;
and the source electrode of the second MOS tube is connected with the other end of the LC resonance circuit and grounded.
The first MOS tube and the second MOS tube are N-channel MOS tubes.
The sampling circuit comprises a first singlechip, a voltage acquisition circuit and a light emitting diode; the first singlechip is connected with the output end of the voltage acquisition circuit and the anode of the light-emitting diode; the input end of the voltage acquisition circuit is connected with the output end of the power output side circuit; the negative electrode of the light-emitting diode is grounded;
the signal control circuit comprises a second singlechip and a photosensitive sensor; wherein, the photosensitive sensor is matched with the light emitting diode, one end of the photosensitive sensor is grounded, and the other end of the photosensitive sensor is connected with the second singlechip; the second singlechip is also connected with the pulse signal source.
Wherein, the light emitting diode is a light emitting diode with the wavelength between 300nM and 750 nM; the photosensor is a photodiode with a wavelength between 300nM and 750 nM.
The sampling circuit further comprises a first three-terminal voltage stabilizer connected with the first singlechip.
The signal control circuit further comprises a second three-terminal voltage stabilizer connected with the second singlechip.
The embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, the control loop and the power loop in the wireless driving power supply are two independent circuits, and the circuits are simple and reliable, so that the control loop and the power loop can be distinguished, the complexity of the circuits is reduced, the control signals are not overlapped on the power loop, and the output voltage or current waveform is prevented from storing the components of the control signals.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that it is within the scope of the invention to one skilled in the art to obtain other drawings from these drawings without inventive faculty.
Fig. 1 is a schematic diagram of system configuration connection of a wireless driving power supply according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a system architecture connection of the power loop of FIG. 1;
FIG. 3 is a schematic diagram of another system architecture connection of the power loop of FIG. 1;
FIG. 4 is a schematic diagram illustrating a system configuration connection when the driving circuit of the power input side circuit in FIGS. 2 and 3 is an asymmetric half-bridge circuit;
FIG. 5 is a schematic diagram of a system architecture connection of the control loop of FIG. 1;
FIG. 6 is a schematic diagram of another system architecture connection of the control loop of FIG. 1;
FIG. 7 is a diagram of an application scenario of the power input side circuit of FIGS. 2 and 3;
FIG. 8 is a diagram of an application scenario of the power output side circuit of FIGS. 2 and 3;
FIG. 9 is an application scenario diagram of the sampling circuit of FIGS. 5 and 6;
fig. 10 is an application scenario diagram of the signal control circuit in fig. 5 and 6.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
As shown in fig. 1, in an embodiment of the present invention, a wireless driving power supply is provided, which includes a power loop 1 and a control loop 2; wherein,,
the power circuit 1 includes a power input side circuit 11 and a power output side circuit 12; the first input end a1 of the power input side circuit 11 is connected with an external voltage source Ud, the second input end a2 is connected with a pulse signal source PWM with variable signal frequency, and the output end a3 is connected with the input end of the power output side circuit 12 through electromagnetic induction, so as to generate corresponding electric energy according to the signal frequency of the pulse signal source PWM and transmit the electric energy to the power output side circuit 12; the output end of the power output side circuit 12 is connected with an external charging device (not shown) for transmitting electric energy to the external charging device for power supply;
the control loop 2 includes a sampling circuit 21 and a signal control circuit 22; the input end of the sampling circuit 21 is connected with the output end of the power output side circuit 12, and is used for sensing the voltage and/or current output by the power output side circuit 12; the input end of the signal control circuit 22 is connected to the output end of the sampling circuit 21, and the output end is connected to the pulse signal source PWM, for identifying the voltage and/or current induced by the sampling circuit 21, and adjusting the signal frequency of the pulse signal source PWM according to the identified voltage and/or current, so that the signal frequency of the pulse signal source PWM varies within a constant range, so as to control the output voltage or current of the power output side circuit 12 to be maintained at a corresponding preset value.
It should be noted that, the voltage and/or current magnitude sensed by the signal control circuit 22 and the sampling circuit 21 may be directly recognized by a numerical value, or may be further recognized by a decision according to the numerical value. For example, the recognized numerical value is compared with a preset threshold value, and the recognition is determined by the open/close state of a switch, a lamp, or other physical object according to the comparison result.
In the embodiment of the present invention, as shown in fig. 2 and 3, the power input side circuit 11 includes an LC resonance circuit 111 formed of a first coupling coil 1111 and a first capacitor 1112, and a driving circuit 112 connected to the LC resonance circuit 111 and driving the LC resonance circuit 111; the power output side circuit 12 includes a second coupling coil 121 having one end thereof for electromagnetic induction with the first coupling coil 1111, and a first diode rectifier bridge 122 (shown in fig. 2) or a MOS transistor synchronous rectifier circuit 123 (shown in fig. 3) connected to the other end of the second coupling coil 121. The driving circuit 112 in the power input side circuit 11 is one of a symmetrical half-bridge circuit, an asymmetrical half-bridge circuit, and a full-bridge circuit.
In one embodiment, as shown in fig. 4, the asymmetric half-bridge circuit includes a half-bridge driver chip 1121, a second diode rectifier bridge 1122, a first MOS transistor 1123, and a second MOS transistor 1124; wherein,,
the half-bridge driving chip 1121 is connected with the pulse signal source PWM, the grid G of the first MOS tube 1123 and the grid G of the second MOS tube 1124;
the drain D of the first MOS transistor 1123 is connected to an external voltage source Ud through the second diode rectifier bridge 1122, and the source S is connected to the drain D of the second MOS transistor 1124 and one end of the LC resonant circuit 111;
the source S of the second MOS transistor 1124 is connected to the other end of the LC resonant circuit 111 and grounded.
Wherein, the first MOS tube 1123 and the second MOS tube 1124 are N-channel MOS tubes.
In the embodiment of the present invention, as shown in fig. 5, the sampling circuit 21 includes a first singlechip 211, a voltage acquisition circuit 212, and a light emitting diode 213; the first singlechip 211 is connected with the output end of the voltage acquisition circuit 212 and the positive electrode (+) of the light emitting diode 213; an input end of the voltage acquisition circuit 212 is connected with an output end of the power output side circuit 12; the negative electrode (-) of the light emitting diode 213 is grounded; the signal control circuit 22 comprises a second singlechip 221 and a photosensitive sensor 222; wherein, the photosensitive sensor 222 is matched with the light emitting diode 213 to sense the light signal emitted by the light emitting diode 213, one end of the photosensitive sensor is grounded, and the other end of the photosensitive sensor is connected with the second singlechip 221; the second singlechip 221 is also connected with a pulse signal source PWM. In one embodiment, light emitting diode 213 is a light emitting diode having a wavelength between 300nM and 750 nM; the photosensor 222 is a photodiode with a wavelength between 300nM-750 nM.
Of course, as shown in fig. 6, in order to ensure that the voltages collected and generated by the sampling circuit 21 and the signal control circuit 22 have stability, the sampling circuit 21 further includes a first three-terminal voltage regulator 214 connected to the first singlechip 211; the signal control circuit 22 further includes a second three-terminal voltage regulator 223 connected to the second single-chip microcomputer 221.
The working principle of the wireless driving power supply in the embodiment of the invention is as follows: the electric energy is transmitted from the input side to the output side through the electromagnetic field between the first coupling coil 1111 of the power input side circuit 11 and the second coupling coil 121 of the power output side circuit 12 in the power loop 1, the sampling circuit 21 in the control loop 2 collects the signal of the output voltage and/or current of the power output side circuit 12, then the light emitting diode 213 is driven to emit light through the electro-optical conversion, the photosensitive sensor 222 of the signal control circuit 22 in the control loop 2 receives the light signal of the light emitting diode 213, and changes the light signal into the corresponding electric pulse signal through the photoelectric conversion to adjust the signal frequency of the pulse signal source PWM, so that the signal frequency of the pulse signal source PWM is changed within a constant range, and the output voltage or current of the power output side circuit 22 can be controlled to be maintained at the corresponding preset value.
As shown in fig. 7 to 10, the application scenario of the wireless driving power supply in the embodiment of the present invention is further described:
fig. 7 is a power input side circuit. The IC101 is a half-bridge driving chip, the T101 is a first MOS tube, the T102 is a second MOS tube, the D101-D104 form a second diode rectifier bridge, the L101 is a first coupling coil, and the C104 is a first capacitor. IC101, D101-D104 and T101/T102 are formed into the driving circuit of the asymmetric half-bridge circuit; l101 and C104 constitute an LC resonance circuit, and the resonance frequency is fo. Meanwhile, the IC102 constitutes an auxiliary power supply circuit on the power input side, providing VCC0 to the signal control circuit in the control loop, and providing V10 to the half-bridge driving circuit constituted by the IC 101.
Fig. 8 is a power output side circuit. L201 is a second coupling coil, and D201-D204 form a first diode rectifier bridge. At this time, the first coupling coil L101 in fig. 7 and the second coupling coil L201 in fig. 8 constitute a near field coupling coil, and energy is coupled from the first coupling coil L101 to the second coupling coil L201. There is no connection between the two coupling coils L101 and L201, thus realizing a wireless constant voltage power supply.
Fig. 9 is a sampling circuit. U301 is a first three-terminal voltage regulator, converting the output voltage Vo into an auxiliary power source VS; r301 and R302 form a voltage acquisition circuit, and a sampling signal is input to an ADC end of the first singlechip U302; the LED401 is a light emitting diode.
Fig. 10 is a signal control circuit. U602 is a second three-terminal voltage regulator, which converts the auxiliary power VCC0 in fig. 7 into an auxiliary power VP; the second singlechip U601 forms signal processing; the photodiode P501 is a photosensor and receives the light signal of the light emitting diode LED 401.
At this time, after the wireless driving power source is powered on, the signal frequency fs of the half-bridge driving signal PWM1 obtained by the power input side circuit from the pulse signal source is gradually reduced from high to fo, and the power output side circuit obtains electric energy through the second coupling coil L201 to output the voltage Vo. Along with the gradual decrease of the signal frequency fs of the half-bridge driving signal PWM1 from high to fo, the output voltage Vo collected by the sampling circuit gradually rises, VS stabilizes and starts the first singlechip U302 of the sampling circuit to output the electric pulse driving signal PWM2 with variable duty ratio as a handshake signal to drive the 4-light emitting diode LED401 to emit light. Once the photosensor P501 in the signal control circuit receives the handshake signal of the 4 light emitting diode LED401, a feedback voltage Vf is generated for the second single chip microcomputer U602, the second single chip microcomputer U602 enters a normal working state after detecting the handshake signal, at this time, the second single chip microcomputer U602 adjusts the frequency of the signal PWM1 of the pulse signal source according to Vf, and inputs the adjusted signal PWM1 to the IC101 half-bridge driving chip to drive the asymmetric half-bridge. When Vo reaches a stable value, the duty ratio of the handshake signal PWM2 output by the first singlechip U302 also reaches stability, so that the value of the feedback voltage Vf in the signal control circuit is also stable, and therefore, the frequency fs of the signal PWM1 of the pulse signal source is stabilized at a certain working frequency to perform micro closed-loop adjustment, so that the output voltage Vo is stabilized.
When the power output side circuit is not placed close to the power input side circuit, or when an iron sheet is placed close to the power input side circuit, although the driving frequency fs of the power input side circuit is slowly reduced from the resonant frequency fo of the high forward coupling coil, the photosensor P501 does not receive the handshake signal of the light emitting diode LED401, the power input side circuit is operated in a hiccup state, for example, the power input side circuit stops operating for 30 seconds, and then the signal frequency fs of the power input side circuit is slowly reduced from the high forward resonant frequency fo again, and the closed loop operation state is not performed until the photosensor P501 receives the signal of the light emitting diode LED 401. Therefore, the circuit at the power input side can be prevented from outputting high-intensity electromagnetic fields all the time, the nearby electrical equipment can be possibly interfered, eddy current loss can be formed in the nearby iron sheet, electric energy is wasted, and safety accidents such as fire danger and the like even occur.
The embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, the control loop and the power loop in the wireless driving power supply are two independent circuits, and the circuits are simple and reliable, so that the control loop and the power loop can be distinguished, the complexity of the circuits is reduced, the control signals are not overlapped on the power loop, and the output voltage or current waveform is prevented from storing the components of the control signals.
The above disclosure is only a preferred embodiment of the present invention, and it is needless to say that the scope of the invention is not limited thereto, and therefore, the equivalent changes according to the claims of the present invention still fall within the scope of the present invention.
Claims (9)
1. The wireless driving power supply is characterized by comprising a power loop and a control loop; wherein,,
the power loop comprises a power input side circuit and a power output side circuit; the power input side circuit comprises a first input end, a second input end, a power output side circuit and a power output side circuit, wherein the first input end of the power input side circuit is connected with an external voltage source, the second input end of the power input side circuit is connected with a pulse signal source with variable signal frequency, the output end of the power input side circuit is connected with the input end of the power output side circuit through electromagnetic induction, and the power input side circuit is used for generating corresponding electric energy according to the signal frequency of the pulse signal source and transmitting the electric energy to the power output side circuit; the output end of the power output side circuit is connected with an external charging device and is used for transmitting the electric energy to the external charging device for supplying power;
the control loop comprises a sampling circuit and a signal control circuit; the input end of the sampling circuit is connected with the output end of the power output side circuit and is used for sensing the voltage and/or current output by the power output side circuit; the input end of the signal control circuit is connected with the output end of the sampling circuit, the output end of the signal control circuit is connected with the pulse signal source and is used for identifying the voltage and/or current induced by the sampling circuit and adjusting the signal frequency of the pulse signal source according to the identified voltage and/or current, so that the signal frequency of the pulse signal source changes within a constant range and the output voltage or current of the power output side circuit can be controlled to be maintained at a corresponding preset value.
2. The wireless driving power supply of claim 1, wherein the power input side circuit includes an LC resonance circuit formed of a first coupling coil and a first capacitor, and a driving circuit connected to the LC resonance circuit and driving the LC resonance circuit;
the power output side circuit comprises a second coupling coil, one end of which is connected with the first coupling coil to realize electromagnetic induction, and a first diode rectifier bridge or an MOS tube synchronous rectifier circuit, wherein the first diode rectifier bridge or the MOS tube synchronous rectifier circuit is connected with the other end of the second coupling coil.
3. The wireless driving power supply of claim 2, wherein the driving circuit in the power input side circuit is one of a symmetrical half-bridge circuit, an asymmetrical half-bridge circuit, and a full-bridge circuit.
4. The wireless drive power supply of claim 3, wherein said asymmetric half-bridge circuit comprises a half-bridge drive chip, a second diode rectifier bridge, a first MOS transistor and a second MOS transistor; wherein,,
the half-bridge driving chip is connected with the pulse signal source, the grid electrode of the first MOS tube and the grid electrode of the second MOS tube;
the drain electrode of the first MOS tube is connected with the external voltage source through the second diode rectifier bridge, and the source electrode is connected with the drain electrode of the second MOS tube and one end of the LC resonance circuit;
and the source electrode of the second MOS tube is connected with the other end of the LC resonance circuit and grounded.
5. The wireless drive power supply of claim 4, wherein said first MOS transistor and said second MOS transistor are both N-channel MOS transistors.
6. The wireless drive power supply of claim 1, wherein the sampling circuit comprises a first single-chip microcomputer, a voltage acquisition circuit and a light emitting diode; the first singlechip is connected with the output end of the voltage acquisition circuit and the anode of the light-emitting diode; the input end of the voltage acquisition circuit is connected with the output end of the power output side circuit; the negative electrode of the light-emitting diode is grounded;
the signal control circuit comprises a second singlechip and a photosensitive sensor; wherein, the photosensitive sensor is matched with the light emitting diode, one end of the photosensitive sensor is grounded, and the other end of the photosensitive sensor is connected with the second singlechip; the second singlechip is also connected with the pulse signal source.
7. The wireless drive power supply of claim 6, wherein said light emitting diode is a light emitting diode having a wavelength between 300nM and 750 nM; the photosensor is a photodiode with a wavelength between 300nM and 750 nM.
8. The wireless drive power supply of claim 7, wherein said sampling circuit further comprises a first three-terminal voltage regulator coupled to said first single-chip microcomputer.
9. The wireless drive power supply of claim 7, wherein said signal control circuit further comprises a second three-terminal voltage regulator coupled to said second single-chip microcomputer.
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| TWI314808B (en) * | 2006-09-06 | 2009-09-11 | Delta Electronics Inc | Resonance converter and driving method for synchronous rectifier thereof |
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