CN111817411A - Step-down rectification circuit and wireless charging control unit - Google Patents
Step-down rectification circuit and wireless charging control unit Download PDFInfo
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- CN111817411A CN111817411A CN202010729726.4A CN202010729726A CN111817411A CN 111817411 A CN111817411 A CN 111817411A CN 202010729726 A CN202010729726 A CN 202010729726A CN 111817411 A CN111817411 A CN 111817411A
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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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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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
- 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
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0034—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using reverse polarity correcting or protecting circuits
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/25—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only arranged for operation in series, e.g. for multiplication of voltage
Abstract
The invention discloses a wireless charging control unit, comprising: the voltage reduction rectifying circuit selects a charging path according to the driving of the controller; the controller judges whether charging can be carried out or not according to the working condition of the charged induction coil and the working condition of the charged electric storage equipment, adjusts the charging time of the voltage reduction rectifying circuit according to the voltage of the charged electric storage equipment, and selects a charging path to charge the charged electric storage equipment according to the potentials at the two ends of the charged induction coil; the voltage reduction rectification circuit is connected with the charged induction coil, and each control point of the voltage reduction rectification circuit is respectively connected with different driving pins of the controller. The invention also discloses a voltage reduction rectification and voltage reduction rectification circuit. The wireless charging control unit provided by the invention can reduce the coil current at the vehicle end, can also reduce the current of the rectifier tube, reduces the output current ripple, can prevent the equipment from being damaged by transient voltage, can reduce the number and size of required electric elements, reduces the cost and improves the wireless charging efficiency.
Description
Technical Field
The invention relates to the field of industrial control, in particular to a voltage reduction rectification circuit connected between a wireless charging charged induction coil and a charged electric storage device (BA). The invention also relates to a wireless charging control unit with the voltage reduction rectifying circuit.
Background
In recent years, new energy vehicles are rapidly developed, and more people begin to choose to accept an environment-friendly travel mode of an electric vehicle. Meanwhile, many automobile manufacturers consider the automobile development direction in the future and invest a large amount of funds for research and development. However, due to practical obstacles to charging problems, it has not been fully generalized. At present, the most important part of electric vehicles is the batteries and charging devices, and they can only use lithium batteries in a short time due to technical bottlenecks, so that wireless (induction) charging systems become another important research and development point. Compared with a wired charging system, wireless charging has multiple advantages and can conform to the future development trend of new energy automobiles. The main application scenario of wireless charging is automatic driving, including but not limited to an automatic driving automobile, a bus, a logistics vehicle, a sweeping robot, and the like. Traditional socket formula charging mode needs the manual work to connect charging plug. While unlimited charging may enable charging without manual operation at all. The wireless charging system is mainly divided into a Wall terminal (Wall Box), a ground terminal coil (BP), a vehicle terminal control unit (VCU) and a vehicle terminal coil (VP).
With the development of wireless charging, the topological structure that the car end charges the battery is five-flower eight. Such as full-bridge rectification, full-wave rectification, current-doubler boost rectification, etc. The topological structures have the defects that the output ripple current is large, and the service life of the battery is influenced; or the current stress of the rectifier tube is large, the efficiency is low and the cost is high. At present, most of automobile wireless charging systems adopt current-doubling boosting rectification. The topology is more suitable for the condition of high voltage and medium current, if the topology is used for low voltage and large current, large current is output to charge a battery, the resonance current of the vehicle end coil (VP) is large, and the voltage of the vehicle end coil (VP) needs to be increased to obtain large resonance current, so that the voltage stress of the rectifier tube is increased, and the current stress of the rectifier tube is also large. Because not only does the rectification need to flow current to charge the battery, but also when the boost fet is switched, reactive current flows. The existing car end rectification topological structure working under the working condition has the defects of large volume and high production cost, and is not beneficial to miniaturization due to the fact that the number of electric elements is large. Moreover, a large number of electrical elements of the conventional buck rectifying circuit can form a large number of output current ripples, and the circuit can be damaged due to transient state higher than the output current ripples under the condition of reverse dragging.
Disclosure of Invention
The invention aims to provide a voltage reduction rectification circuit which is connected between a wireless charging charged induction coil and a charged electric storage device (BA), can reduce the current of the wireless charging charged induction coil and filter the induced current (reduce output current ripple), has an anti-reverse function and can reduce the number of required electric elements.
Another technical problem to be solved by the present invention is to provide a wireless charging control unit having the above buck rectifying circuit.
In order to solve the above technical problem, the present invention provides a buck rectification circuit for a wireless charging device, including:
a filter circuit WF electrically connected between a connection point first BA1 and a connection point second BA2 of the charged storage device BA; the filter circuit WF can adopt a capacitor or a circuit formed by a resistor and a capacitor which are connected in parallel;
a first connection point S1.1 of the first filter switch structure S1 is electrically connected with a second connection point P1.2 of the first resonance device P1, a second connection point S1.2 of the first filter switch structure S1 is electrically connected with a first connection point S2.1 of the second filter switch structure S2 and is electrically connected with a first BA1 connection point BA of the charged electric storage equipment through a first inductor L1, and a control point of the first filter switch structure S1 is used as a first Ctrl1 control end of the voltage reduction rectification circuit;
the second connection point S2.2 of the second filter switch structure S2 is electrically connected to the second connection point Q1.2 of the first rectifier device Q1, the second connection point S3.2 of the third filter switch structure S3 and the second connection point BA2 of the charged power storage device BA, and is connected to ground, and the control point of the second connection point S2.2 is used as the second Ctrl2 of the buck rectifier circuit;
a first connection point S3.1 of the third filter switch structure S3 is electrically connected with a second connection point S4.2 of the fourth filter switch structure S4 and is connected with a first connection point BA2 of the charged power storage device BA through a second inductor L2, and a control point of the first connection point S3.1 is used as a control end three Ctrl3 of the voltage reduction rectification circuit;
a connection point I S4.1 of the filter switch structure IV S4 is electrically connected with a connection point II P2 of the buck rectification circuit, and a control point of the connection point I S4.1 is used as a control end IV Ctrl4 of the buck rectification circuit;
the first resonance device C1 and the second resonance device C2 are in parallel resonance with the vehicle-end induction coil, and the first resonance device C1 and the second resonance device C2 are connected between the first connection point and the second connection point of the voltage reduction rectification circuit in series; the capacitance of the first resonator component C1 and the capacitance of the second resonator component C2 can be selected;
a first connection point Q1.1 of the first rectifying device Q1 is electrically connected between the first resonant device C1 and the second resonant device C2, and a second connection point Q1.2 of the first rectifying device Q1 is electrically connected with a second connection point Q2.2 of the second rectifying device Q2;
a connection point I Q2.1 of the second rectifying device Q2 is electrically connected with a connection point II P2 of the step-down rectifying circuit;
diodes can be selected from the first rectifying device Q1 and the second rectifying device Q2;
wherein at least one of the first filtering switch structure to the fourth filtering switch structure S1 to S4 is the following filtering switch structure;
the first end of the switching device S is connected between the capacitor three C3 and the capacitor four C4, the second end of the switching device S is connected to the ground through the capacitor five C5, and the capacitor three C3 and the capacitor four C4 are connected in series between the first connection point and the second connection point of the filter switch structure and are connected with the inductor three L3 in parallel; the third end of the switch device S is used as a control point I of the filter switch structure, the capacitance values of the capacitor three C3 and the capacitor four C4 are equal, and the capacitance value of the capacitor five C5 is more than 100 times larger than the capacitance values of the capacitor three C3 and the capacitor four C4.
Optionally, the step-down rectification circuit is further improved, wherein the first filtering switch structure to the fourth filtering switch structure S1 to S4 do not adopt an NMOS for the filtering switch structure.
Correspondingly, NMOS can be adopted in the first filtering switch structure to the fourth filtering switch structure S1 to S4
Optionally, the filter switch structures of the buck rectifier circuit, i.e., the filter switch structures from S1 to S4, are further improved, two ends of each switch are connected in parallel with an anti-reverse circuit, and the anti-reverse circuits are identical in structure;
the anti-reverse circuit comprises an anti-reverse diode and a transient suppression diode, and the anti-reverse diode and the transient suppression diode are connected in series to form the anti-reverse circuit;
the anode of the transient suppression diode is connected with the switch at the high-position end of the switch, the anode of the anti-reverse diode is connected with the switch at the low-voltage end, and the cathode of the anti-reverse diode is connected with the cathode of the transient suppression diode.
The invention provides a wireless charging control unit with any one of the voltage reduction rectification circuits, which comprises:
the voltage reduction rectifying circuit is electrically connected between the charged induction coil and the charged electric storage equipment BA, and the voltage reduction rectifying circuit selects a charging path to charge the charged electric storage equipment BA according to the driving of the controller;
the controller judges whether charging can be carried out or not according to the working condition of the charged induction coil and the working condition of the charged storage equipment BA, adjusts the charging time of the voltage reduction rectifying circuit according to the voltage of the charged storage equipment BA, and selects a charging path to charge the charged storage equipment BA according to the potentials at the two ends of the charged induction coil;
the first connection point P1 of the buck rectification circuit is electrically connected with the first connection point of the charged induction coil, the second connection point P2 of the buck rectification circuit is electrically connected with the second connection point of the charged induction coil, and each control point of the buck rectification circuit is respectively connected with different driving pins of the controller.
Optionally, the wireless charging control unit is further modified, if the controller detects that the potential of the first connection point of the charged induction coil is higher than the potential of the second connection point, the first filter switch structure S1 and the third filter switch structure S3 are turned on, and the second filter switch structure S2 and the fourth filter switch structure S4 are turned off;
if the controller detects that the potential of the first connecting point of the charged induction coil is lower than the potential of the second connecting point, the first filtering switch structure S1 and the third filtering switch structure S3 are turned off, and the second filtering switch structure S2 and the fourth filtering switch structure S4 are turned on.
Optionally, the wireless charging control unit is further improved, the controller drives all switches of the buck rectifying circuit to be turned on, if the current signal of the charged induction coil, the charging current signal of the charged electric storage device BA and the voltage signal are obtained, the charging is allowed to be performed, otherwise, the charging is not allowed to be performed.
Optionally, the wireless charging control unit is further improved, and if the controller detects that the voltage of the charged power storage device BA rises, the on duration of all switches of the buck rectifying circuit is reduced and the off duration is increased in the control period.
Compared with the prior technical scheme adopting current-doubling boosting rectification, the voltage-reducing rectification circuit provided by the invention at least has the following technical effects:
1. the invention integrates the voltage reduction rectification circuit and the current doubling circuit, and reduces the current of the coil at the vehicle end to 0.8 time of the original current on the premise of reducing electric elements as much as possible and reasonably selecting device parameters. Therefore, the technical scheme of reducing the number of required electric elements can be realized, the size of the voltage reduction rectification circuit can be reduced due to the reduction of the number of the electric elements, the cost is reduced, and the efficiency is improved.
2. The filter switch structure provided by the invention can accurately filter (reduce output current ripples) the voltage reduction rectifying circuit compared with the existing structure. The filtering (reducing output current ripple) effect can be achieved only by selecting any one of the first filtering switch structure and the fourth filtering switch structure.
Fig. 3 is an equivalent circuit diagram of the filter switch structure in an off state. Supposing that the capacitance values of the capacitor three C3 and the capacitor four C4 are both C and the inductance value of the inductor three L3 is L, when the switching device S is turned off, only L and C in parallel resonance exist between the two ends of the filter switch structure, and high impedance is presented. Therefore, no path exists, the filtering switch structure is in an off state, and the working parameters of all devices are selected according to the actual working conditions.
Fig. 4 is an equivalent circuit diagram of the filter switch structure in the on state. When the switching device S is turned on, since the capacitance of the capacitor five C5 is much larger than C (much larger than 100 times), so that the capacitor five C5 appears as a short circuit at the operating frequency of the filtering switch structure, the point at which the capacitor three C3 and the capacitor four C4 are connected is shorted to the ground by the switching device S. An impedance network consisting of an inductor three L3, a capacitor three C3 and a capacitor four C4 is formed between two connecting points of the filter switch structure. The absolute values of the inductance L of the inductor three L3 and the capacitance C of the capacitor three C3 and the capacitor four C4 were determined. Therefore, the filter switch structure provided by the invention only uses relatively few circuit elements, not only provides high isolation in the off state, but also has an impedance conversion function in the on state, so that the inductor three L3, the capacitor three C3 and the capacitor four C4 play circuit functions in the off state and the on state, and the function of filtering output current ripples is realized by using fewer circuit elements.
3. The voltage rectifying circuit is protected by connecting the switch with the anti-reverse circuit in parallel, and the anti-reverse circuit uses the transient suppression anti-reverse circuit consisting of the transient suppression diode and the anti-reverse diode. The transient suppression diode is a key element of a protection circuit, and parameters of the transient suppression diode need to be selected according to actual conditions. The transient suppression diode has higher response speed than a capacitor and stronger protection capability on the switching device. The voltage reduction rectification circuit can be prevented from being damaged by transient high voltage generated by dragging a vehicle.
The working principle of the wireless charging control unit provided by the invention is as follows:
when the vehicle end control unit VCU starts the in-position detection before charging, the in-position detection is to detect the offset and distance condition of the ground end coil BP and the vehicle end coil VP and the coupling condition of the two coils.
And the DSP controller turns on all the first to fourth filter switch structures, detects that the current of the vehicle end coil VP is sent to the DSP controller, and sends a battery voltage signal to the DSP controller, so that the DSP controller knows the coupling condition of the ground end coil BP and the vehicle end coil VP and the battery voltage. When the DSP controller detects that the battery voltage rises, the conduction time of the MOS tube is reduced, namely, as the battery voltage rises, the duty ratio of the MOS tube is reduced.
When the vehicle end control unit VCU detects that the first end potential of the vehicle end coil VP is high and the second end potential is low (positive up and negative down), the first filter switch structure S1 and the third filter switch structure S3 are turned on, the second filter switch structure S2 and the fourth filter switch structure S4 are turned off, and two paths are provided for charging the battery: firstly, current passes through a first capacitor C1, a filter switch structure I S1, an inductor I L1, a charged electric storage device BA, a rectifier device II Q2 (diode) and then reaches a vehicle end coil VP; secondly, the inductor two L2 continuously flows through the charged power storage device BA and the filter switch structure three S3 to the inductor one L1.
When the vehicle end control unit VCU detects that the first end potential of the vehicle end coil VP is low and the second end potential is high (negative up and positive down), the first filter switch structure Q1 and the third switch S3 are turned off, the second filter switch structure S2 and the fourth filter switch structure S4 are turned on, and there are two paths for charging the battery: firstly, current passes through a filter switch structure IV S4, an inductor II L2, a charged electric storage device BA, a rectifying device I Q1 (diode) and a first capacitor C1 and then reaches a vehicle end coil VP; secondly, the inductor I L1 continuously flows through the charged power storage device BA, the filter switch structure II S2 and the inductor I L1.
The wireless charging control unit provided by the invention can at least realize the following technical effects that the voltage reduction rectifying circuit and the current doubling circuit are integrated together, so that the VP current and the rectifying tubes are reduced to 0.8 time of the original current, and the current is small, so that the rectifying tubes with smaller specifications or the number of the parallel rectifying tubes can be selected, the cost is further reduced, and the wireless charging efficiency is improved. Double-inductor (L1 and L2) current doubling is adopted, current ripples of the two inductors are complementary and have a 180-degree difference, and the energy current ripples are greatly reduced after the current ripples are superposed. The VP current of the coil at the vehicle end can be reduced, the current of the rectifier tube can be reduced, and the output current ripple is reduced; the number of required electric elements is reduced, the size of the voltage reduction rectification circuit can be reduced due to the reduction of the number of the required electric elements, the cost is reduced, and the wireless charging efficiency is improved. And moreover, the filtering switch structure is adopted, so that the current ripple can be greatly reduced, and the wireless charging control unit can be controlled more accurately. The structure that the filtering switch structure is connected in parallel with the anti-reverse circuit is adopted, the wireless charging control unit can be prevented from being damaged by transient high voltage, and the safety and the stability of the wireless charging control unit are improved.
Drawings
The invention will be described in further detail with reference to the following detailed description and accompanying drawings:
fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a filter switch according to a first embodiment of the present invention.
Fig. 3 is a schematic diagram of the first structural principle of the filter switch of the present invention.
Fig. 4 is a schematic diagram of the structural principle of the filter switch of the present invention.
Fig. 5 is a schematic diagram of a filter switch according to a second embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a third embodiment of the present invention.
Fig. 7-9 are schematic diagrams of a third embodiment of the present invention.
Description of the reference numerals
Capacitors one to five C1 to C5
Rectifier device Q1
Rectifier two Q2
Anti-reverse diode D1
Transient suppression diode D2
Filter switch structure one to filter switch structure four S1 to S4
Switching device S
First to fourth control terminals Ctrl1 to Ctrl4
Inductors one to three L1 to L3
BA1 (positive pole) as the connection point of the charged storage battery BA
BA connection point of charged accumulator BA2 (cathode)
Filter circuit WF
Voltage reduction rectification circuit RC
DSP controller DSP
And a vehicle end induction coil VP.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and technical effects of the present invention will be fully apparent to those skilled in the art from the disclosure in the specification. The invention is capable of other embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the general spirit of the invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
A first embodiment, as shown in fig. 1, provides a buck rectifier circuit, comprising:
a filter circuit WF electrically connected between a connection point first BA1 and a connection point second BA2 of the charged storage device BA;
a first connection point S1.1 of the first filter switch structure S1 is electrically connected with a second connection point P1.2 of the first resonance device P1, a second connection point S1.2 of the first filter switch structure S1 is electrically connected with a first connection point S2.1 of the second filter switch structure S2 and is electrically connected with a first BA1 connection point BA of the charged electric storage equipment through a first inductor L1, and a control point of the first filter switch structure S1 is used as a first Ctrl1 control end of the voltage reduction rectification circuit;
the second connection point S2.2 of the second filter switch structure S2 is electrically connected to the second connection point Q1.2 of the first rectifier device Q1, the second connection point S3.2 of the third filter switch structure S3 and the second connection point BA2 of the charged power storage device BA, and is connected to ground, and the control point of the second connection point S2.2 is used as the second Ctrl2 of the buck rectifier circuit;
a first connection point S3.1 of the third filter switch structure S3 is electrically connected with a second connection point S4.2 of the fourth filter switch structure S4 and is connected with a first connection point BA2 of the charged power storage device BA through a second inductor L2, and a control point of the first connection point S3.1 is used as a control end three Ctrl3 of the voltage reduction rectification circuit;
a connection point I S4.1 of the filter switch structure IV S4 is electrically connected with a connection point II P2 of the buck rectification circuit, and a control point of the connection point I S4.1 is used as a control end IV Ctrl4 of the buck rectification circuit;
the first resonance device C1 and the second resonance device C2 are in parallel resonance with the vehicle-end induction coil, and the first resonance device C1 and the second resonance device C2 are connected between the first connection point and the second connection point of the voltage reduction rectification circuit in series;
a first connection point Q1.1 of the first rectifying device Q1 is electrically connected between the first resonant device C1 and the second resonant device C2, and a second connection point Q1.2 of the first rectifying device Q1 is electrically connected with a second connection point Q2.2 of the second rectifying device Q2;
a connection point I Q2.1 of the second rectifying device Q2 is electrically connected with a connection point II P2 of the step-down rectifying circuit;
referring to fig. 2, at least one of the first to fourth filter switch structures S1 to S4 is a filter switch structure as follows;
the first end of the switching device S is connected between the capacitor three C3 and the capacitor four C4, the second end of the switching device S is connected to the ground through the capacitor five C5, and the capacitor three C3 and the capacitor four C4 are connected in series between the first connection point and the second connection point of the filter switch structure and are connected with the inductor three L3 in parallel; the third end of the switch device S is used as a control point I of the filter switch structure, the capacitance values of the capacitor three C3 and the capacitor four C4 are equal, and the capacitance value of the capacitor five C5 is more than 100 times larger than the capacitance values of the capacitor three C3 and the capacitor four C4.
In the first embodiment, the first to fourth filter switch structures S1 to S4 are further improved by not using an NMOS for the filter switch structure.
Second embodiment, with continued reference to fig. 1, the present invention provides a buck rectifier circuit comprising:
a filter circuit WF electrically connected between a connection point first BA1 and a connection point second BA2 of the charged storage device BA;
a first connection point S1.1 of the first filter switch structure S1 is electrically connected with a second connection point P1.2 of the first resonance device P1, a second connection point S1.2 of the first filter switch structure S1 is electrically connected with a first connection point S2.1 of the second filter switch structure S2 and is electrically connected with a first BA1 connection point BA of the charged electric storage equipment through a first inductor L1, and a control point of the first filter switch structure S1 is used as a first Ctrl1 control end of the voltage reduction rectification circuit;
the second connection point S2.2 of the second filter switch structure S2 is electrically connected to the second connection point Q1.2 of the first rectifier device Q1, the second connection point S3.2 of the third filter switch structure S3 and the second connection point BA2 of the charged power storage device BA, and is connected to ground, and the control point of the second connection point S2.2 is used as the second Ctrl2 of the buck rectifier circuit;
a first connection point S3.1 of the third filter switch structure S3 is electrically connected with a second connection point S4.2 of the fourth filter switch structure S4 and is connected with a first connection point BA2 of the charged power storage device BA through a second inductor L2, and a control point of the first connection point S3.1 is used as a control end three Ctrl3 of the voltage reduction rectification circuit;
a connection point I S4.1 of the filter switch structure IV S4 is electrically connected with a connection point II P2 of the buck rectification circuit, and a control point of the connection point I S4.1 is used as a control end IV Ctrl4 of the buck rectification circuit;
the first resonance device C1 and the second resonance device C2 are in parallel resonance with the vehicle-end induction coil, and the first resonance device C1 and the second resonance device C2 are connected between the first connection point and the second connection point of the voltage reduction rectification circuit in series;
a first connection point Q1.1 of the first rectifying device Q1 is electrically connected between the first resonant device C1 and the second resonant device C2, and a second connection point Q1.2 of the first rectifying device Q1 is electrically connected with a second connection point Q2.2 of the second rectifying device Q2;
a connection point I Q2.1 of the second rectifying device Q2 is electrically connected with a connection point II P2 of the step-down rectifying circuit;
referring to fig. 5, at least one of the first to fourth filter switch structures S1 to S4 has the following structure;
the first end of the switching device S is connected between the capacitor three C3 and the capacitor four C4, the second end of the switching device S is connected to the ground through the capacitor five C5, and the capacitor three C3 and the capacitor four C4 are connected between the connection point one and the connection point two of the switch in series and are connected with the inductor three L3 in parallel; the third end of the switch device S is used as a control point I of the filter switch structure, the capacitance values of the capacitor three C3 and the capacitor four C4 are equal, the capacitance value of the capacitor five C5 is more than 100 times larger than the capacitance values of the capacitor three C3 and the capacitor four C4, two ends of each of the switches of the filter switch structure I to the filter switch structure four S1 to S4 are connected in parallel with an anti-reverse circuit, and the anti-reverse circuits are identical in structure;
the anti-reverse circuit comprises an anti-reverse diode D1 and a transient suppression diode D2, wherein the anti-reverse diode D1 and the transient suppression diode D2 are connected in series to form the anti-reverse circuit;
the anode of the transient suppression diode D2 is connected to the high-potential end of the switch, the anode D1 of the anti-reverse diode is connected to the low-voltage end of the switch, and the cathode of the anti-reverse diode D1 is connected to the cathode of the transient suppression diode D2.
In a third embodiment, as shown in fig. 6, the present invention provides a wireless charging control unit, including:
the vehicle-end induction coil VP is suitable for carrying out current wireless transmission with the wireless charging ground-end coil through electromagnetic induction;
the voltage reduction rectification and voltage reduction rectification circuit RC is connected between the vehicle end induction coil VP and the charged electric storage equipment BA of the vehicle-mounted battery, and is driven by the DSP controller to provide different charging paths to charge the charged electric storage equipment (BA) of the vehicle-mounted battery;
the DSP controller can judge whether the wireless charging ground end coil and the vehicle end induction coil are in place or not according to the working condition of the vehicle end induction coil and the working condition of the charged power storage device BA of the vehicle-mounted battery before starting charging, can adjust the turn-on time of the step-down rectification circuit according to the voltage of the charged power storage device BA of the vehicle-mounted battery, and can enable the step-down rectification circuit to provide different charging paths according to the potentials at two ends of the vehicle end induction coil so as to charge the charged power storage device BA of the vehicle-mounted.
According to the first embodiment of the wireless charging control unit, the VP current of the coil at the vehicle end can be reduced, the current of the rectifier tube can be reduced, and the output current ripple can be reduced; the number of required electric elements is reduced, and the size of the voltage reduction rectification and voltage reduction rectification circuit can be reduced due to the reduction of the number of the required electric elements, so that the cost is reduced, and the efficiency is improved.
The wireless charging control unit is further explained as follows, and the principle is shown in fig. 7;
the DSP controller judges whether the wireless charging ground end coil and the vehicle end induction coil are in place or not in the following mode;
and the DSP controller drives the filtering switch structure S1-S4 to be conducted, if the DSP controller obtains a current signal of the vehicle-end induction coil, a charging current signal of the vehicle-mounted battery charged electric storage device BA and a voltage signal of the vehicle-mounted battery charged electric storage device BA by sampling, the wireless charging ground coil and the vehicle-end induction coil are judged to be in place, and if not, the wireless charging ground coil and the vehicle-end induction coil are judged not to be in place.
After the wireless charging ground coil and the vehicle end induction coil are in place, the DSP controller controls the implementation of wireless charging in the following mode;
and if the DSP controller detects that the voltage of the vehicle-mounted battery is increased by the BA of the charged electric storage equipment, the conduction time of the MOS tube is reduced, and the duty ratio of the filtering switch structure S1-S4 is controlled to be reduced.
If the DSP controller detects that the first end of the induction coil at the vehicle end is high in potential and the second end is low (positive up and negative down), driving the first filtering switch structure S1 and the third filtering switch structure S3 to be switched on, and switching off the second filtering switch structure S2 and the fourth filtering switch structure S4; there are two paths for charging the battery, as shown with reference to fig. 8.
When the vehicle end control unit VCU detects that the first end potential of the vehicle end coil VP is low and the second end potential is high (negative up and positive down), the first filtering switch structure S1 and the third filtering switch structure S3 are driven to be turned off, and the second filtering switch structure S2 and the fourth filtering switch structure S4 are driven to be turned on; there are two paths for charging the battery, as shown with reference to fig. 9.
The present invention has been described in detail with reference to the specific embodiments and examples, but these are not intended to limit the present invention. Many variations and modifications may be made by one of ordinary skill in the art without departing from the principles of the present invention, which should also be considered as within the scope of the present invention.
Claims (7)
1. A step-down rectification circuit for a wireless charging device, comprising:
a filter circuit (WF) electrically connected between a first connection point and a second connection point of the charged power storage device (BA);
the first connection point of the first filter switch structure (S1) is electrically connected with the second connection point of the first resonance device (P1), the second connection point of the first filter switch structure (S1) is electrically connected with the second connection point of the second filter switch structure (S2) and is electrically connected with the first connection point of the charged electric storage equipment (BA) through the first inductor (L1), and the control point of the first filter switch structure (S8926) is used as the first control end (Ctrl 1) of the voltage reduction rectification circuit;
the second connection point of the second filter switch structure (S2) is electrically connected with the second connection point of the first rectifier device (Q1), the second connection point of the third filter switch structure (S3) and the second connection point of the charged electric storage device (BA) and is connected with the ground in parallel, and the control point of the second connection point is used as the second control end (Ctrl 2) of the buck rectification circuit;
the first connection point of the third filter switch structure (S3) is electrically connected with the second connection point of the fourth filter switch structure (S4) and is connected with the first connection point of the charged electric storage equipment (BA) through the second inductor (L2), and the control point of the first connection point is used as the third control end (Ctrl 3) of the voltage reduction rectification circuit;
a first connection point of a fourth filter switch structure (S4) is electrically connected with a second connection point of the buck rectification circuit, and a control point of the first connection point is used as a fourth control end (Ctrl 4) of the buck rectification circuit;
the first resonance device (C1) and the second resonance device (C2) are in parallel resonance with the vehicle-end induction coil, and the first resonance device (C1) and the second resonance device (C2) are connected between the first connection point and the second connection point of the voltage reduction rectifying circuit in series;
the first connection point of the first rectifying device (Q1) is electrically connected between the first resonant device (C1) and the second resonant device (C2), and the second connection point of the first rectifying device (Q1) is electrically connected with the second connection point of the second rectifying device (Q2);
the first connection point of the second rectifying device (Q2) is electrically connected with the second connection point of the step-down rectifying circuit;
wherein at least one of the first to fourth filter switch structures (S1-S4) is the following filter switch structure;
the first end of the switching device (S) is connected between the capacitor three (C3) and the capacitor four (C4), the second end of the switching device (S) is connected to the ground through the capacitor five (C5), and the capacitor three (C3) and the capacitor four (C4) are connected between the connection point one and the connection point two of the filter switch structure in series and are connected with the inductor three (L3) in parallel; the third end of the switch device (S) is used as a control point one of the filter switch structure, the capacitance values of the capacitor three (C3) and the capacitor four (C4) are equal, and the capacitance value of the capacitor five (C5) is more than 100 times larger than the capacitance values of the capacitor three (C3) and the capacitor four (C4).
2. The step-down rectifier circuit according to claim 1, wherein: the first to fourth filter switch structures (S1-S4) do not use NMOS for the filter switch structures.
3. The step-down rectifier circuit according to claim 1, wherein: the two ends of each of the first filtering switch structure, the second filtering switch structure and the fourth filtering switch structure (S1-S4) are connected in parallel with an anti-reverse circuit, and the anti-reverse circuits are identical in structure;
the anti-reverse circuit comprises an anti-reverse diode and a transient suppression diode, and the anti-reverse diode and the transient suppression diode are connected in series to form the anti-reverse circuit;
the anode of the transient suppression diode is connected with the switch at the high-position end of the switch, the anode of the anti-reverse diode is connected with the switch at the low-voltage end, and the cathode of the anti-reverse diode is connected with the cathode of the transient suppression diode.
4. A wireless charging control unit having the step-down rectification circuit according to any one of claims 1 to 3, comprising:
the voltage reduction rectifying circuit is electrically connected between the charged induction coil and the charged electric storage equipment (BA), and the voltage reduction rectifying circuit selects a charging path to charge the charged electric storage equipment (BA) according to the driving of the controller;
the controller judges whether charging can be carried out or not according to the working condition of the charged induction coil and the working condition of the charged electric storage equipment (BA), the controller adjusts the charging time of the voltage reduction rectifying circuit according to the voltage of the charged electric storage equipment (BA), and the controller selects a charging path to charge the charged electric storage equipment (BA) according to the electric potentials at the two ends of the charged induction coil;
the first connection point of the voltage reducing rectification circuit is electrically connected with the first connection point of the charged induction coil, the second connection point of the voltage reducing rectification circuit is electrically connected with the second connection point of the charged induction coil, and each control point of the voltage reducing rectification circuit is respectively connected with different driving pins of the controller.
5. The wireless charging control unit of claim 4, wherein:
if the controller detects that the potential of the first connecting point of the charged induction coil is higher than the potential of the second connecting point, the first filter switch structure (S1) and the third filter switch structure (S3) are switched on, and the second filter switch structure (S2) and the fourth filter switch structure (S4) are switched off;
if the controller detects that the potential of the first connection point of the charged induction coil is lower than the potential of the second connection point, the first filter switch structure (S1) and the third filter switch structure (S3) are turned off, and the second filter switch structure (S2) and the fourth filter switch structure (S4) are turned on.
6. The wireless charging control unit of claim 4, wherein: the controller drives all switches of the step-down rectification circuit to be conducted, if the current signal of the charged induction coil, the charging current signal of the charged electric storage device (BA) and the voltage signal are obtained, the charging is allowed to be carried out, otherwise, the charging is not allowed to be carried out.
7. The wireless charging control unit of claim 4, wherein: if the controller detects that the voltage of the charged electric storage equipment (BA) rises, the on-time of all switches of the voltage reduction rectification circuit is shortened in the control period, and the off-time is prolonged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010729726.4A CN111817411A (en) | 2020-07-27 | 2020-07-27 | Step-down rectification circuit and wireless charging control unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010729726.4A CN111817411A (en) | 2020-07-27 | 2020-07-27 | Step-down rectification circuit and wireless charging control unit |
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| CN111817411A true CN111817411A (en) | 2020-10-23 |
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| CN202010729726.4A Withdrawn CN111817411A (en) | 2020-07-27 | 2020-07-27 | Step-down rectification circuit and wireless charging control unit |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108574479A (en) * | 2017-03-08 | 2018-09-25 | 康希通信科技（上海）有限公司 | Single-pole single-throw(SPST RF switch and its hilted broadsword of composition throw RF switch more |
| CN111404405A (en) * | 2020-04-28 | 2020-07-10 | 上海纵青新能源科技有限公司 | Step-down rectification circuit and wireless charging vehicle end control unit |
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2020
- 2020-07-27 CN CN202010729726.4A patent/CN111817411A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108574479A (en) * | 2017-03-08 | 2018-09-25 | 康希通信科技（上海）有限公司 | Single-pole single-throw(SPST RF switch and its hilted broadsword of composition throw RF switch more |
| CN111404405A (en) * | 2020-04-28 | 2020-07-10 | 上海纵青新能源科技有限公司 | Step-down rectification circuit and wireless charging vehicle end control unit |
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| 张宇坤等: "基于TPS2492的离散量功率驱动接口优化设计研究", 《科技经济导刊》 * |
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