CN114069739A - Voltage stabilization output method and wireless charging receiving device - Google Patents

Voltage stabilization output method and wireless charging receiving device Download PDF

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Publication number
CN114069739A
CN114069739A CN202010761462.0A CN202010761462A CN114069739A CN 114069739 A CN114069739 A CN 114069739A CN 202010761462 A CN202010761462 A CN 202010761462A CN 114069739 A CN114069739 A CN 114069739A
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circuit
voltage
switch
output
charged
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柳百毅
韩成建
陈为
冯绍杰
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

When the output voltage of the voltage stabilizing circuit (namely the voltage at two sides of the load) is smaller than a preset voltage value, the load is disconnected with the charging circuit, so that the voltage stabilizing circuit is prevented from entering an unstable interval, and the voltage at two ends of the load is lower; when the output voltage of the voltage stabilizing circuit is greater than or equal to the preset voltage value, the load is reconnected with the charging circuit, so that the voltage stabilizing circuit can work in a stable interval, and the stability of the output voltage of the load side is realized.

Description

Voltage stabilization output method and wireless charging receiving device
Technical Field
The application relates to the field of circuits, in particular to a voltage stabilizing output method and a wireless charging receiving device.
Background
The omnidirectional wireless charging is a technology that charging is less affected by distance and direction and effective charging can be realized in any direction within an effective charging area range. The technology is an improvement on a unidirectional-based 'patch-type' wireless charging technology, and is one of the trends of the development of the future wireless charging technology. At present, a receiving side voltage stabilizing circuit for omnidirectional wireless charging generally adjusts a duty ratio of a direct current/direct current (DC/DC) converter to adjust a load output voltage through a proportional-integral-derivative (PID) control algorithm, so that the load voltage is stable, but the conventional voltage stabilizing circuit does not consider an alternating current internal resistance of a receiving side coil, so that the conventional voltage stabilizing circuit has an unstable interval in which a voltage stabilizing function fails, and meanwhile, the conventional wireless charging closed-loop control system is complex, expensive and complex in control algorithm.
How to stabilize the load-side voltage becomes an urgent problem to be solved.
Disclosure of Invention
Compared with the traditional voltage stabilizing circuit, the method for voltage stabilization output improves the influence caused by the high alternating current internal resistance of the receiving side coil, avoids the unstable interval of voltage stabilization failure of the voltage stabilizing circuit, and accordingly realizes the stability of the voltage on the load side.
In a first aspect, a method for stabilizing voltage output is provided, including: judging whether the output voltage of the first circuit is higher than or equal to a first preset voltage value or not, wherein the output voltage is used for charging equipment to be charged; when the output voltage of the first circuit is higher than or equal to a first preset voltage value, connecting the equipment to be charged with the first circuit; and when the output voltage of the first circuit is lower than a first preset voltage value, disconnecting the equipment to be charged from the first circuit.
In the technical scheme, when the output voltage of the voltage stabilizing circuit (namely the voltage at two sides of the load) is smaller than a preset voltage value, the load is disconnected from the charging circuit so as to prevent the voltage stabilizing circuit from entering an unstable interval and enable the voltage at two ends of the load to be lower; when the output voltage of the voltage stabilizing circuit is greater than or equal to the preset voltage value, the load is reconnected with the charging circuit, so that the voltage stabilizing circuit can work in a stable interval, and the voltage at the load side is stabilized. Compared with the traditional wireless charging system and the voltage stabilizing circuit thereof, the wireless charging system can realize the voltage stabilizing function at a longer distance under the same condition, and allows the receiving coil to have higher internal resistance, so that the design range of the receiving coil is wider.
With reference to the first aspect, in some implementations of the first aspect, the device to be charged is connected to the first circuit when an output voltage of the first circuit is higher than or equal to a first preset voltage value and an input voltage of the first circuit is higher than or equal to a second preset voltage value, where the input voltage is used to provide a voltage for the output voltage.
With reference to the first aspect, in certain implementations of the first aspect, the device to be charged is connected to the first circuit when an input voltage of the first circuit is higher than or equal to a second preset voltage value, where the input voltage is used to provide a voltage for the output voltage, and when the input voltage of the first circuit is higher than or equal to the second preset voltage value, the output voltage of the first circuit is higher than or equal to the first preset voltage value.
In a second aspect, a wireless charging receiving apparatus is provided, including: the induction circuit is used for providing voltage for the equipment to be charged; the rectifying circuit is used for converting alternating current generated by the induction circuit into direct current; a DC/DC converter for regulating the voltage of the device to be charged; the first switch is connected between the output positive electrode of the rectifying circuit and the input positive electrode of the DC/DC converter; the second switch is connected between the output positive electrode of the rectifying circuit and the output positive electrode of the DC/DC converter; and the third switch is connected between the output positive electrode of the DC/DC converter and the positive electrode of the equipment to be charged.
In the above technical solution, a specific circuit for implementing the voltage stabilizing method of the first aspect through logic control of three switches is provided, the three switches are applied among the rectifying circuit, the voltage stabilizing circuit and the output load thereof, and the operating mode of the circuit does not need to be controlled by the primary side, that is, the circuit can implement voltage stabilizing output in a wider range without establishing communication with the primary side circuit.
With reference to the second aspect, in certain implementations of the second aspect, the wireless charge receiving apparatus further includes: and the charging circuit is connected between the second switch and the output negative electrode of the DC/DC converter and is used for increasing the voltage on two sides of the charging circuit to a first preset voltage value under the conditions that the second switch is closed and the first switch and the third switch are opened.
With reference to the second aspect, in some implementations of the second aspect, the wireless charge receiving apparatus further includes: the intelligent switch gating module is used for controlling the on/off of the first switch, the second switch and the third switch.
With reference to the second aspect, in certain implementations of the second aspect, the intelligent switch gating module is a relay, and the relay includes a first switch, a second switch, and a third switch.
In a third aspect, a method for outputting a regulated voltage is provided, where the method is applied to the wireless charging receiving apparatus of the second aspect, and the method includes: when the voltage on the two sides of the equipment to be charged is smaller than a first preset voltage value, closing the second switch and opening the first switch and the third switch; or when the voltage on the two sides of the charging circuit is greater than or equal to the first preset voltage value, the second switch is opened and the first switch and the third switch are closed.
In a fourth aspect, a wireless charging transmitting apparatus is provided, including: the switch group comprises N switches, wherein N is more than or equal to 2 and is an integer; the induction coil array comprises N coils, and N switches are respectively in one-to-one correspondence with the N induction coils; the power circuit is used for providing excitation current for the induction coil array; the power circuit, the switch group and the induction coil array are connected in series.
In the technical scheme, aiming at the scene that a plurality of transmitting coils work in multiple directions, the coupling effect of the receiving coil and the transmitting coil can also influence the size of the unstable interval of the voltage stabilizing circuit, and the coil with the best coupling effect with the receiving coil in the transmitting induction coil array can be determined under the condition of not needing original secondary side communication through the size of the primary side current corresponding to the transmitting coil, so that the size of the unstable interval of the voltage stabilizing circuit is reduced.
With reference to the fourth aspect, in some implementations of the fourth aspect, the wireless charging transmitting apparatus further includes: the sampling circuit is used for periodically sampling the current on the N coils; the comparison circuit is used for comparing the sampled currents on the N coils and determining the minimum current on the N coils; and the intelligent switch gating module is used for determining the on or off of the N switches according to the minimum current on the N coils.
With reference to the fourth aspect, in some implementations of the fourth aspect, the intelligent switch gating module is a relay, and the relay includes N switches in the switch group.
In a fifth aspect, a method for determining a transmitting induction coil is provided, which is applied to the wireless charging transmitting apparatus of the fourth aspect, and includes: under the condition that the output voltages of the power circuits are the same, sequentially closing N switches at N moments, and simultaneously opening the rest (N-1) switches; respectively sampling currents on the N coils after the N switches are sequentially closed; determining the minimum current on the N coils according to the sampled currents on the N coils; the intelligent switch gating module closes the switch corresponding to the minimum current value and simultaneously disconnects the rest (N-1) switches.
According to the scheme provided by the embodiment, when the output voltage of the voltage stabilizing circuit (namely the voltage at two sides of the load) is smaller than the preset voltage value, the load is disconnected from the charging circuit, so that the voltage stabilizing circuit is prevented from entering an unstable interval, and the voltage at two ends of the load is lower; when the output voltage of the voltage stabilizing circuit is greater than or equal to the preset voltage value, the load is reconnected with the charging circuit, so that the voltage stabilizing circuit can work in a stable interval, and the voltage at the load side is stabilized.
Drawings
FIG. 1 is a schematic diagram of a conventional post-stage voltage regulator circuit.
FIG. 2 is a drawing showingV in traditional voltage stabilizing circuit under influence of internal resistance of receiving coiloAnd D.
Fig. 3 is a method for stabilizing voltage output according to an embodiment of the present application.
Fig. 4 is a schematic diagram of a three-switch wireless charging receiving apparatus provided in the present application.
Fig. 5 is a schematic diagram of a single-switch wireless charge receiving apparatus provided in the present application.
Fig. 6 is a schematic diagram of a two-switch wireless charge receiving apparatus provided in the present application.
FIG. 7 is at VoV different when the target stable value is 5sAnd D.
Fig. 8 is a schematic diagram of a wireless charging transmitting device provided in the present application.
Fig. 9 is a schematic diagram of a three-transmitting-coil wireless charging transmitting device provided in the present application.
Fig. 10 a planar spiral coil design proposed by the present application.
Detailed Description
The technical solution in the present application will be described below with reference to the accompanying drawings.
The technical scheme of the embodiment of the application can be applied to various scenes needing wireless charging. The intelligent wearable electric vehicle has the advantages that the intelligent wearable electric vehicle has more freedom, flexibility and convenience in space position in application fields such as intelligent wearable and electric vehicles.
The wireless charging technology is a technology for realizing non-contact electric energy transmission through an air medium not through a wire but through modes of electromagnetic induction, radio frequency, microwave, laser and the like. At present, wireless charging research achievements are quite abundant, and 'patch type' wireless charging is already commercialized and widely applied to the fields of smart phones and the like. However, the use of the "patch type" wireless charging device is limited because the device is required to be closely attached to the charging pad. For example, when the device is moved at will, such as when a mobile phone is put in a pocket and a watch is worn on a hand, it is difficult to achieve effective wireless charging, and the device must be placed flat on a charging pad.
The omnidirectional wireless charging is a technology that charging is less affected by distance and direction and effective charging can be realized in any direction within an effective charging area range. The technology is an improvement on a unidirectional-based 'patch-type' wireless charging technology, and is one of the trends of the development of the future wireless charging technology.
At present, a control strategy of time division multiplexing and excitation amplitude adjustment is adopted, and a three-dimensional orthogonal transmitting coil is adopted, so that the omnidirectional wireless charging of a receiving coil is realized. On the basis, a front-end monitoring control strategy is further provided, so that the system can realize omnidirectional control without sampling signals of a receiving side. This strategy, while solving the problem of transmitting side to receiving side communication to some extent, requires the use of an SS compensation network and requires that the circuit not operate near the resonance point, reducing system output power and efficiency.
Referring to FIG. 1, FIG. 1 is a schematic diagram of a conventional post-stage voltage regulator circuit. The voltage stabilizing circuit realizes the regulation of load voltage through a rear-stage direct current/direct current (DC/DC) converter. The receiving side generally performs rectification, filtering, and voltage regulation by a DC/DC converter, thereby achieving a constant output voltage on the load side. A DC/DC converter is a device that converts a DC power supply of a certain voltage class into a DC power supply of another voltage class. By collecting the value of the output voltage VoThe duty ratio of the DC/DC converter is adjusted by a proportional-integral-derivative (PID) control algorithm to adjust the output voltage, so that the load voltage is stabilized.
However, this method of adjusting the output voltage by adjusting the duty ratio does not consider the ac internal resistance of the receiving coil, and the load voltage V in fig. 1 is obtained while considering the influence of the internal resistance of the receiving-side induction coiloAnd receiving side coil induced voltage VsThe following relationships exist:
Figure BDA0002613198830000041
wherein Vs is the induced voltage of the receiving coil, RsFor receiving the ac resistance of the coil, D is DC/DC modeThe duty cycle of the block. ReIs an equivalent resistance to the input of the DC/DC module on the load side, and
Figure BDA0002613198830000042
where eta is the efficiency of the DC/DC module, RoIs a load.
Referring to fig. 2, fig. 2 shows a V-voltage regulator circuit under the influence of the internal resistance of the receiving coil in the conventional voltage regulator circuitoAnd D. In FIG. 2 at Vs＝1，Rs＝10，RoWhen V is 100, η is 0.9, fig. 2oWhen D increases, this part of the interval is called the stable interval, and when V is increasedoWhen D decreases with an increase in D, this part of the interval is called an unstable interval.
As can be seen from fig. 2, the unstable interval is located in the interval with a high duty ratio, and V is set to be a value when the receiving-side circuit is not powered and starts operating in accordance with the modulation method for adjusting the duty ratio of the DC/DC converter according to the conventional PID control algorithmoIt is usually relatively small, i.e. the system is initially put into operation, requiring a rapid rise in VoAt this time, the duty ratio D is increased through PID adjustment, so that the voltage stabilizing circuit is easy to step into an unstable working interval.
When the conventional load voltage stabilizing circuit shown in fig. 1 has an unstable interval due to the increasing duty ratio, and the output voltage V is increasedoBelow load RoWhen the voltage required by normal work is needed, the traditional load voltage stabilizing circuit can continuously increase the duty ratio of the DC/DC converter through a PID control link, and as can be seen from fig. 2, the voltage V is output in an unstable intervaloAs the duty ratio D increases, the duty ratio becomes lower, and the voltage stabilizing effect cannot be achieved by such a cycle.
In view of this, the present application provides a feedback-free structure of a receiving-side output voltage stabilizing circuit, which optimizes a conventional load voltage stabilizing circuit, so as to better implement the voltage stabilizing function of the load circuit.
Various embodiments provided herein will be described in detail below with reference to the accompanying drawings.
Fig. 3 is a method for stabilizing voltage output according to an embodiment of the present application.
S301, judging whether the output voltage of the first circuit is higher than or equal to a first preset voltage value, if so, jumping to S302, and if not, jumping to S303.
And S302, when the output voltage of the first circuit is higher than or equal to a first preset voltage value, connecting the device to be charged with the first circuit, wherein the output voltage is used for charging the device to be charged.
Optionally, when the output voltage of the first circuit is higher than or equal to a first preset voltage value and the input voltage of the first circuit is higher than or equal to a second preset voltage value, the device to be charged is connected to the first circuit.
Optionally, when the input voltage of the first circuit is higher than or equal to a second preset voltage value, the device to be charged is connected to the first circuit, wherein when the input voltage of the first circuit is higher than the second preset voltage value, the output voltage of the first circuit is higher than or equal to the first preset voltage value.
And S303, disconnecting the device to be charged from the first circuit when the output voltage of the first circuit is lower than a first preset voltage value.
Optionally, in S304, when the device to be charged is disconnected, the output voltage of the first circuit is charged to increase the voltage value of the output voltage of the first circuit, and then S301 is skipped. According to the technical scheme, whether the equipment to be charged is connected to the charging circuit or not is determined according to the output voltage value between circuits for directly charging the load, so that the situation that the equipment to be charged enters an unstable working interval due to the fact that the equipment to be charged is connected to the equipment to be charged when the output voltage value is small is avoided.
By way of example and not limitation, the present application provides three methods of achieving the regulated output based on the existing voltage regulator circuit.
The first method comprises the following steps: a three-switch mode.
Referring to fig. 4, fig. 4 is a schematic view of a three-switch wireless charging receiving apparatus provided in the present application.
This receiving side wireless charging receiving arrangement includes: a sensing circuit, a rectifying circuit, a first circuit,wherein the first circuit comprises: DC/DC converter, first switch (S)1) A second switch (S)2) And a third switch (S)3) A first capacitor (C)o) And a relay (i.e., an example of an intelligent gating module). Wherein the content of the first and second substances,
the induction circuit is used for providing voltage for the equipment to be charged;
the rectifying circuit is used for converting alternating current generated by the induction circuit into direct current;
a DC/DC converter for regulating the voltage of the device to be charged;
the relay is used as a logic switch and comprises two normally open contacts S1And S3A normally closed contact S2And a relay coil for passing a conduction voltage V of the coil in the relaysetControlling the first switch, the second switch and the third switch to be closed or opened;
a first switch connected between an output positive electrode of the rectifying circuit and an input positive electrode of the DC/DC converter;
a second switch connected between the output positive electrode of the rectifying circuit and the output positive electrode of the DC/DC converter;
the third switch is connected between the output positive electrode of the DC/DC converter and the positive electrode of the equipment to be charged;
and the first capacitor is used for charging the coil in the relay.
Referring to FIG. 1, a conventional voltage regulator circuit is equivalent to the switch S in FIG. 41And S3Remains normally closed, and S2Is kept normally open.
Specifically, when the receiving side is not operating, the receiving side circuit holds the switch S1And S3Is kept in a normally open state, and S2The normally closed state is maintained. When the receiving side starts to work, the relay coil is powered by the output capacitor CoProviding, the on-state voltage value V of the relay coilsetThe voltage stabilizing circuit can be ensured to work in a stable interval. When C is presentoVoltage V acrosso(i.e., the output voltage of the first circuit) up to the relay coil turn-on voltage VsetOpening, openingOff S1And S3Closure, S2And when the voltage stabilizing circuit is disconnected, the voltage stabilizing circuit is equivalent to the traditional voltage stabilizing circuit, and the circuit adjusts the duty ratio D of the DC/DC converter through a PID control algorithm to adjust the load voltage Vo. When the capacitance CoThe voltage at two ends is less than the relay coil conducting voltage VsetTime, i.e. load voltage VoLess than relay coil conducting voltage VsetTime relay switch S2Closed, switch S1And S3Open circuit, the voltage stabilizing circuit does not work, and the receiving coil induces voltage V at the momentsWill be directly given to CoCharging until CoThe voltage at the two ends rises to the relay coil conducting voltage VsetAt this time, switch S1And S3Closed, switch S2When the DC/DC converter is disconnected, the DC/DC converter starts to work normally to supply power to the load, and the output voltage V is outputoThe voltage rises to a certain value, so that the DC/DC module can normally work in a stable interval.
It should be understood that fig. 4 only shows one connection mode of the three switches, and the switch connection mode capable of implementing the voltage stabilization method proposed by the present application is within the protection scope of the present application, for example: the three switches in fig. 4 may also be connected symmetrically, that is, the first switch is connected between the output negative electrode of the rectifying circuit and the input negative electrode of the DC/DC converter, the second switch is connected between the output negative electrode of the rectifying circuit and the output negative electrode of the DC/DC converter, and the third switch is connected between the output negative electrode of the DC/DC converter and the negative electrode of the device to be charged.
In the technical scheme, the situation that the alternating current internal resistance of the receiving side coil can cause the traditional voltage stabilizing circuit to have an unstable interval with a voltage stabilizing function failure is considered, a working mode of three-switch logic switching is provided on the basis of the traditional voltage stabilizing circuit, the traditional voltage stabilizing circuit is prevented from working in the unstable interval, the three switches are applied among the receiving coil, the voltage stabilizing circuit and an output load, the working mode of the three switches is not controlled by a primary side, namely, the voltage stabilizing output in a large range can be realized without establishing communication with the primary side circuit, and meanwhile, compared with the traditional voltage stabilizing circuit, the load can realize the voltage stabilizing function at a longer distance under the same condition.
Optionally, in the case that the device to be charged of the voltage stabilizing circuit of fig. 4 is disconnected, C in fig. 4inThe voltage values of both sides are Vin(an example of an input voltage of the first circuit), where Vo＝VinD/(1-D), so that V can be detectedinOr VoTo judge the output voltage VoWhether or not the set value is reached is compared with the detection VoDetecting V in boost modeinLower relay voltage, low power consumption, but VinAfter reaching the set value, VoThere may be a period of time before the set value is reached, so there is a risk of stepping into an unstable region, and therefore it is necessary to set the detection V according to a specific circuitinOr VoThis is not a specific limitation of the present application.
And the second method comprises the following steps: single switch mode.
Referring to fig. 5, fig. 5 is a schematic view of a single-switch wireless charge receiving apparatus provided in the present application.
This wireless receiving arrangement that charges includes: induction circuit, rectifying circuit, DC/DC converter, third switch (S)3) A first capacitor (C)o) And a relay (i.e., an example of an intelligent gating module).
The induction circuit is used for providing voltage for the equipment to be charged; the rectifying circuit is used for converting alternating current generated by the induction circuit into direct current; a DC/DC converter for regulating the voltage of the device to be charged; the third switch is connected between the output positive electrode of the DC/DC converter and the positive electrode of the equipment to be charged; the first capacitor is used for charging a coil in the relay; and the relay is used for controlling the closing or opening of the third switch through the conducting voltage of the coil in the relay.
Optionally, when the voltage V is applied across the first capacitoroLess than the on-voltage V of the relayset(i.e., an example of the first preset voltage value), the relay turns off the third switch; or when the voltage V across the first capacitoroGreater than or equal to the on-voltage V of the relaysetThe relay is closedThe third switch is closed.
Alternatively, C in FIG. 5 is shown with the third switch of the voltage stabilizing circuit of FIG. 5 open (i.e., the device to be charged is disconnected)inThe voltage values of both sides are Vin(i.e., another example of the input voltage of the first circuit), then Vo＝VinD/(1-D), and therefore also by detecting VinTo judge the output voltage VoWhether or not the set value is reached is compared with the detection VoDetecting V in boost modeinLower relay voltage, low power consumption, but VinAfter reaching the set value, VoThere may be a period of time before the set value is reached, so there is a risk of stepping into an unstable region, and therefore it is necessary to set the detection V according to a specific circuitinOr VoThis is not a specific limitation of the present application. And the third is that: two-switch type.
Referring to fig. 6, fig. 6 is a schematic view of a two-switch wireless charge receiving apparatus provided in the present application.
This wireless receiving arrangement that charges includes: induction circuit, rectifying circuit, DC/DC converter, third switch (S3), fourth switch (S4), first capacitor (C)o) A second capacitor (C)in) A first relay and a second relay.
The induction circuit is used for providing voltage for the equipment to be charged; the rectifying circuit is used for converting alternating current generated by the induction circuit into direct current; a DC/DC converter for regulating the voltage of the device to be charged; the third switch is connected between the output positive electrode of the DC/DC converter and the positive electrode of the equipment to be charged; the fourth switch is connected between the output negative electrode of the DC/DC converter and the negative electrode of the equipment to be charged; the first capacitor is used for charging a coil in the first relay; the second capacitor is used for charging a coil in the second relay; the first relay is used for controlling the closing or opening of the third switch through the conducting voltage of a coil in the relay; and the second relay is used for controlling the closing or opening of the fourth switch through the conducting voltage of the coil in the second relay.
Optionally, when electricity is present across the first capacitorPressure VoIs less than the breakover voltage V of the first relayset1(i.e., an example of the first preset voltage value), the first relay turns off the third switch; or when the voltage V across the second capacitorinLess than the turn-on voltage V of the second relayset2(i.e., an example of the second preset voltage value), the second relay turns off the fourth switch; or when the voltage V across the first capacitoroIs greater than or equal to the breakover voltage V of the first relayset1And the voltage V across the second capacitorinGreater than or equal to the turn-on voltage V of the second relayset2The first relay closes the third switch and the second relay closes the fourth switch.
By way of example and not limitation, the DC/DC converter in all embodiments of the present application may be a Buck-Boost circuit.
It should be understood that the present application only provides three specific circuit structure diagrams for implementing the voltage stabilization method proposed in the present application by way of example, and any circuit structure capable of implementing the voltage stabilization method of the present application falls within the scope of protection of the present application.
Except that the internal resistance of the coil at the receiving side can influence the function of the voltage stabilizing circuit, the induced voltage V at the receiving sidesThe difference also affects the unstable region of the voltage regulator circuit.
Referring to FIG. 7, FIG. 7 is at VoV different when the target stable value is 5sAnd D. It can be seen that in FIG. 7 at Rs，RoWhen eta is the same, by VoAs an example, the target stable value is 5, and the induced voltage V issV is equal to 5, 10, 15 respectivelysThe larger the size, the smaller the instability interval indicated by the shaded portion.
The induced voltage V is influenced by the coupling effect of the receiving coil and the transmitting coilsIn view of the above, the present application provides a primary circuit structure, which can better implement the voltage stabilizing function of the load circuit by gating the transmitting coil coupled with the receiving coil best.
Fig. 8 is a schematic diagram of a wireless charging transmitting device provided in the present application.
The wireless isThe charging and transmitting device comprises a primary circuit power circuit and a switch group (for example, n (n ≧ 2) gating switches S of the primary circuit1,…,Sn) An array of transmission coils, wherein the array of transmission coils comprises n conductive transmission coils TX1,…,TXnAnd gates switch S1,…,SnAnd conducting a transmitting induction coil TX1,…,TXnAnd correspond to each other. The power circuit, switch set and induction coil array are connected in series as shown in figure 7.
Optionally, the apparatus may further include a sampling circuit, a comparing circuit, and a peak hold circuit. Wherein the content of the first and second substances,
and the power circuit is used for providing excitation current for the transmitting induction coil array.
And the high-frequency sampling circuit is used for periodically sampling the current on the n conductive transmitting coils.
And the peak holding circuit is used for carrying out peak current on the sine wave current sampled on the n conducting transmitting coils.
And the comparison circuit is used for comparing the sampled currents on the n coils and determining the minimum current on the n coils.
And the intelligent switch gating module is used for determining the on or off of the n switches in the switch group according to the minimum current on the n coils.
It will be appreciated that the parameters of the currents must be the same when comparing the currents on the n coils using a comparison circuit, for example: comparing the peak or average current over the n coils, etc.
It should be noted that the n transmission coils and the reception coil on the reception side have mutual inductance M, respectively1,…,MnUnder the condition that the power circuit outputs the same voltage, the self-inductances of the n conductive transmitting induction coils can be considered to be completely the same in the calculation process of the current.
Alternatively, by applying at time t1,…,tnSequentially gating switch S1,…,SnAnd sequentially acquiring the current i of each transmitting induction coil branch through a Micro Controller Unit (MCU)1,…,inAs mentioned above mayThe peak current of the n coils may be a mean current of the n coils, and the present application is not limited specifically. Since the higher the coupling coefficient of the transmitting induction coil and the receiving coil, the smaller the current of the transmitting coil, the comparison circuit is based on the time t1,…,tnDetermination of the minimum current value i by the currents in the n transmitting coils that are switched onkThe intelligent switch gating module closes the minimum current i according to the minimum current valuekSwitch S of corresponding conducting coilkOpening the remaining other switches of the switch group, i.e. to TXkThe coil is the best conducting coil.
Optionally, a relay may be used as an example of the intelligent switch gating module, and the relay includes a switch S1,…,SnAnd a relay coil corresponding to each switch.
Optionally, the high-frequency sampling circuit uses the LTC6252 with a bandwidth of 720MHz as a pre-sampling scaling circuit, and guarantees a sampling range under the condition of meeting the bandwidth requirement.
Optionally, the peak holding circuit adopts the OPA615 as a transconductance value peak sampling circuit, and the bandwidth of the OPA615 is 720MHz, which is easy to meet the requirement of high-frequency sampling.
The transmitting side circuit comprises 3 switches S1、S2And S3The transmitting coil array includes 3 conductive transmitting coils TX _ x, TX _ y, TX _ z for illustration, wherein, the gating switch S1、S2And S3Respectively correspond to the conductive transmitting coils TX _ x, TX _ y and TX _ z one by one.
Referring to fig. 9, fig. 9 is a schematic diagram of a three-transmitting-coil wireless charging transmitting device provided in the present application.
When the receiving coil RX _ x is positioned in the x direction, the conductive transmitting coil TX _ x in the x direction is preferably coupled with the receiving coil RX _ x, and at the moment, the 3 conductive transmitting coils TX _ x, TX _ y and TX _ z have mutual inductance Mxx，MyxAnd MzxWherein M isxx>Myx，Mxx>MzxThen, under the condition that the power circuit outputs the same voltage, the switch S can be sequentially gated1、S2And S3By sampling the current i of each branch1，i2，i3Of (a) wherein i1，i2，i3Peak currents through the transmitting coils TX _ x, TX _ y, TX _ z, respectively, due to Mxx>Myx，Mxx>MzxThen i is1<i2，i1<i3According to the minimum current value, determining TX _ x as the best conducting coil, closing switch S1The transmitting coil TX _ x is gated. At this time, the transmitting coil TX _ x and the receiving coil RX _ x are preferably coupled, and the larger the induced voltage of the receiving side circuit is, the smaller the unstable interval is.
It should be understood that LTX _ x, LTX _ y, and LTX _ z in fig. 9 sequentially represent the self-inductances of the 3 transmitting coils in the x, y, and z directions, and the self-inductances of the 3 receiving coils can be considered to be identical in the calculation process of the above currents.
In the technical scheme, the transmitting coils in the transmitting coil array are sequentially gated, the optimal conducting coil on the transmitting side is determined and gated according to the peak current of each transmitting coil branch, the coupling effect of the transmitting coils and the receiving coil is the best, the induction voltage of the receiving coil is the highest, and in the scheme, only the transmitting side circuit is required to judge the current, and the transmitting side circuit is not required to communicate with the receiving side circuit.
In addition, the application also provides a method for determining the primary circuit transmitting induction coil. The current of each coil in the coil array is sequentially acquired at different times, and the coil with the minimum current is selected as the actual transmitting coil, and the specific method is the same as that described in fig. 8 and 9, and the process is not repeated here.
From the above, the receiving side induction coil significantly improves the ac internal resistance RsThe conventional voltage stabilizing circuit has an unstable interval with a voltage stabilizing function failure, so that the conventional induction coil is improved, and the alternating current internal resistance of the induction coil at the receiving side can be reduced.
According to the finite element simulation result of the planar spiral coil, the magnetic field distribution of the planar spiral coil has the characteristics of larger magnetic field intensity at the inner side and the outer side and smaller magnetic field intensity at the middle. In order to reduce the ac resistance of the coil, it is necessary to design a smaller winding wire diameter at a place with a larger field strength, so that the eddy current loss can be reduced.
Referring to fig. 10, fig. 10 illustrates a planar spiral coil design proposed by the present application. The induction coil is formed by combining a plurality of turns of coils, wherein the Inner Diameter (ID) and the Outer Diameter (OD) of the induction coil and the cross section of the coil are shown in figure 10, for the design of the coupling coil, a proper position in the middle of the induction coil is selected as the turn position of the maximum line width, the turn width of each turn is firstly increased by k1 from inside to outside, then is decreased by k2, and the turn gap is firstly changed by kg1 from inside to outside and then is changed by kg2, wherein k1 is more than 1, k2 is more than 1, kg1 is more than or equal to 1, and kg2 is more than or equal to 1.
The above-mentioned embodiments, objects, technical solutions and advantages of the present application are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present application, and are not intended to limit the scope of the present application, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present application should be included in the scope of the present application.

Claims (12)

1. A method of stabilizing voltage output, comprising:
judging whether the output voltage of the first circuit is higher than or equal to a first preset voltage value or not, wherein the output voltage is used for charging the equipment to be charged;
when the output voltage of the first circuit is higher than or equal to the first preset voltage value, connecting the equipment to be charged with the first circuit;
and when the output voltage of the first circuit is lower than the first preset voltage value, disconnecting the equipment to be charged from the first circuit.
2. The method of claim 1, wherein connecting the device to be charged to the first circuit when the output voltage of the first circuit is greater than or equal to a first preset voltage value comprises:
when the output voltage of the first circuit is higher than or equal to the first preset voltage value and the input voltage of the first circuit is higher than or equal to the second preset voltage value, the device to be charged is connected with the first circuit, wherein the input voltage is used for providing voltage for the output voltage.
3. The method of claim 1, wherein connecting the device to be charged to the first circuit when the output voltage of the first circuit is greater than or equal to a first preset voltage value comprises:
connecting the device to be charged with the first circuit when the input voltage of the first circuit is higher than or equal to a second preset voltage value,
the input voltage is used for providing voltage for the output voltage, and when the input voltage of the first circuit is higher than or equal to the second preset voltage value, the output voltage of the first circuit is higher than or equal to the first preset voltage value.
4. A wireless charging receiving device, comprising:
the induction circuit is used for providing voltage for the equipment to be charged;
the rectifying circuit is used for converting alternating current generated by the induction circuit into direct current;
a DC/DC/DC converter for regulating a voltage of the device to be charged;
a first switch connected between an output positive electrode of the rectifying circuit and an input positive electrode of the DC/DC converter;
a second switch connected between an output positive electrode of the rectifying circuit and an output positive electrode of the DC/DC converter;
a third switch connected between an output positive electrode of the DC/DC converter and a positive electrode of the device to be charged.
5. The wireless charge receiving arrangement of claim 4, further comprising:
and the charging circuit is connected between the second switch and the output negative electrode of the DC/DC converter, and is used for increasing the voltage on two sides of the charging circuit to a first preset voltage value under the conditions that the second switch is closed and the first switch and the third switch are opened.
6. The wireless charge receiving arrangement of claim 5, further comprising:
the intelligent switch gating module is used for controlling the first switch, the second switch and the third switch to be switched on or switched off.
7. The wireless charge receiving device of claim 6, wherein the intelligent switch gating module is a relay, and the relay comprises the first switch, the second switch and the third switch.
8. A method of outputting a regulated voltage, applied to the wireless charging receiving apparatus according to any one of claims 4 to 7, the method comprising:
when the voltage on the two sides of the equipment to be charged is smaller than the first preset voltage value, closing the second switch and opening the first switch and the third switch; or
And when the voltage on two sides of the charging circuit is greater than or equal to the first preset voltage value, the second switch is opened, and the first switch and the third switch are closed.
9. A wireless charging transmitting device, comprising:
the switch group comprises N switches, wherein N is more than or equal to 2 and is an integer;
the induction coil array comprises N coils, and the N switches are respectively in one-to-one correspondence with the N induction coils;
a power circuit for providing an excitation current to the array of induction coils;
the power circuit, the switch set and the induction coil array are connected in series.
10. The wireless charging transmitting device of claim 9, further comprising:
a sampling circuit for periodically sampling the current on the N coils;
a comparison circuit for comparing the sampled currents on the N coils to determine a minimum current on the N coils;
and the intelligent switch gating module is used for determining the on or off of the N switches according to the minimum current on the N coils.
11. The wireless charging transmitting device of claim 10, wherein the intelligent switch gating module is a relay comprising N switches in the switch group.
12. A method for determining a transmitting induction coil, applied to the wireless charging transmitting device according to any one of claims 9 to 11, comprising:
under the condition that the output voltages of the power circuits are the same, sequentially closing the N switches at N moments, and simultaneously opening the rest (N-1) switches;
respectively sampling the current on the N coils after the N switches are sequentially closed;
determining a minimum current on the N coils from the sampled currents on the N coils;
and closing the switch corresponding to the minimum current value, and simultaneously opening the rest (N-1) switches.
CN202010761462.0A 2020-07-31 2020-07-31 Voltage stabilization output method and wireless charging receiving device Pending CN114069739A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010761462.0A CN114069739A (en) 2020-07-31 2020-07-31 Voltage stabilization output method and wireless charging receiving device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010761462.0A CN114069739A (en) 2020-07-31 2020-07-31 Voltage stabilization output method and wireless charging receiving device

Publications (1)

Publication Number Publication Date
CN114069739A true CN114069739A (en) 2022-02-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
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