CN110165916A - Control circuit, control method and the wireless charging transmitter using it of switching circuit - Google Patents
Control circuit, control method and the wireless charging transmitter using it of switching circuit Download PDFInfo
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- CN110165916A CN110165916A CN201910305166.7A CN201910305166A CN110165916A CN 110165916 A CN110165916 A CN 110165916A CN 201910305166 A CN201910305166 A CN 201910305166A CN 110165916 A CN110165916 A CN 110165916A
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- 238000001514 detection method Methods 0.000 claims description 36
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- 238000012512 characterization method Methods 0.000 claims description 2
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- 238000010586 diagram Methods 0.000 description 10
- 239000003990 capacitor Substances 0.000 description 8
- 230000009467 reduction Effects 0.000 description 4
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Classifications
-
- 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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac 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
- H02M7/537—Conversion of dc power input into ac 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, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac 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, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
-
- 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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac 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
- H02M7/537—Conversion of dc power input into ac 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, e.g. single switched pulse inverters
- H02M7/539—Conversion of dc power input into ac 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, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—Conversion of dc power input into ac 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, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
Abstract
The present invention proposes the control circuit, control method and the wireless charging transmitter using it of a kind of switching circuit, the switching circuit includes first switch tube, second switch, third switching tube and the 4th switching tube, first switch tube and second switch first end are as switching circuit input terminal or output end, first switch tube second end is connected with third switching tube first end, and common end is the first common end；Second switch second end is connected with the 4th switching tube first end, and common end is the second common end；The third switching tube second end and the 4th switching tube second end ground connection；First common end and the second common end are separately connected lc circuit or L circuit, and the control circuit controls the switching circuit work in various modes according to application demand.
Description
Technical field
The present invention relates to field of power electronics, in particular to a kind of control circuit of switching circuit, control method and application
Its wireless charging transmitter.
Background technique
In switching circuit applied to the prior art of wireless charging, the switching circuit include including first switch tube,
Second switch, third switching tube and the 4th switching tube, first switch tube and second switch first end are defeated as switching circuit
Enter end, first switch tube second end is connected with third switching tube first end, and common end is the first common end；Second switch
Two ends are connected with the 4th switching tube first end, and common end is the second common end；The third switching tube second end and described
Four switching tube second ends ground connection；First common end and the second common end are separately connected lc circuit, first switch tube and third switch
Pipe forms first bridge arm of switching circuit, second bridge arm of second switch and the 4th switching tube composition switching circuit.The
One bridge arm of one pulse-width signal PWM1 control switch circuit, the second modulated signal PWM2 control switch circuit another
Bridge arm, the switching circuit can be connected into full bridge inverter and two independent half-bridge inversion circuits.The switch electricity of the prior art
The circuit-mode that road can be connected into is single, is not able to satisfy the demand of a variety of circuit-modes.Existing switching circuit is applied in wireless charging
When in electricity, the output voltage of adapter needs just to obtain the defeated of switching circuit after DC voltage conversion circuit under normal conditions
Enter voltage, circuit structure is more complicated.
Summary of the invention
The object of the present invention is to provide a kind of control circuit of switching circuit, control method and using its wireless charging hair
Emitter, for solving the problems, such as the prior art, there are switching circuit operating mode is single.
To achieve the above object, the present invention provides a kind of control circuit of switching circuit, the switching circuit includes the
One switching tube, second switch, third switching tube and the 4th switching tube, first switch tube first end and second switch first end
The input terminal or output end of corresponding circuit respectively under switching circuit different working modes, first switch tube second end and
The connection of three switching tube first ends, common end are the first common end；Second switch second end and the 4th switching tube first end connect
It connects, common end is the second common end；The third switching tube second end and the 4th switching tube second end ground connection；First is public
End and the second common end are separately connected lc circuit or L circuit altogether；First switch tube and third switching tube form switching circuit
First bridge arm, second bridge arm of second switch and the 4th switching tube composition switching circuit, the first common end and the second public affairs
End is respectively the middle-end of first bridge arm and the middle-end of second bridge arm altogether；
The control circuit selects the operating mode of the switching circuit according to the working condition of pattern detection circuit；Institute
Control circuit is stated according to the operating mode of switching circuit, receives the first pulse-width signal and the second pulse-width signal, or
Feedback voltage and the first pulse-width signal are received, or receives feedback voltage and the second pulse-width signal, described in control
Switching circuit works in corresponding modes.
Optionally, the control circuit includes pattern detection circuit, and there are three types of working condition, institutes for the pattern detection circuit
Pattern detection circuit is stated in work in the first state, the switching circuit work exists in full-bridge inverting mode, or work
Two independent semi-bridge inversion modes；The pattern detection circuit work is in second of state, and one of selected on-off circuit
Bridge arm work works in boost mode, another bridge arm of selected on-off circuit in semi-bridge inversion mode；The mode detection electricity
Road works in the third state, the work of a bridge arm of selected on-off circuit in decompression mode, selected on-off circuit it is another
A bridge arm work is in semi-bridge inversion mode.
Optionally, the control circuit further includes control module and drive module, and the control module first input end connects
The output end of pattern detection circuit is connect, the second input terminal connects for receiving feedback voltage, the drive module first input end
The pattern detection circuit output end is connect, second input terminal of drive module connects the control module output end, the drive
Dynamic model block third input terminal and the 4th input terminal are respectively used to receive the first pulse-width signal and the second pulse-width signal.
Optionally, in the first state, the control module does not receive feedback voltage for pattern detection circuit work, and first
One bridge arm of pulse-width signal control switch circuit, another bridge arm of the second pulse-width signal control switch circuit,
The switching circuit work is in full-bridge inverting mode or two independent semi-bridge inversion modes.
Optionally, in second of state, the control module receives feedback voltage for the pattern detection circuit work, the
One switching tube first end or second switch first end are the output end of a bridge arm of switching circuit, the feedback voltage table
The output voltage of the bridge arm is levied, the feedback voltage controls bridge arm work in boost mode；First pulse-width signal or
Another bridge arm of second pulse-width signal control switch circuit works in semi-bridge inversion mode.
Optionally, in the third state, the control module receives feedback voltage, institute for the pattern detection circuit work
The average value of voltage at a bridge arm middle-end of feedback voltage characterization switching circuit is stated, the feedback voltage controls bridge arm work
In decompression mode；The work of another bridge arm of first pulse-width signal or the second pulse-width signal control switch circuit exists
Semi-bridge inversion mode.
Optionally, the switching circuit work is in full-bridge inverting mode, two middle-ends of two bridge arms of switching circuit
Between connect lc circuit；One bridge arm of switching circuit works in semi-bridge inversion mode or decompression mode, the bridge arm middle-end
Connect lc circuit；One bridge arm of switching circuit works in boost mode, and the middle-end of the bridge arm connects L circuit.
Optionally, the control circuit further includes linear voltage-stabilizing circuit, the linear voltage-stabilizing circuit input terminal connection switch
The output end of one bridge arm of circuit, the output end are first switch tube first end or second switch first end；It is described linear
Voltage regulator circuit exports voltage of voltage regulation.
Optionally, the control circuit further includes protection circuit, and the protection circuit input end receives first switch tube and adopts
Sample electric current, second switch sample rate current, first switch tube first end voltage, second switch first end voltage and temperature detection
Signal, output end connect driving circuit input terminal, the protection circuit to switching circuit progress overvoltage protection, under-voltage protection,
Overcurrent protection and overheat protector.
Optionally, the control module receives enable signal, when the enable signal is high level, the normal work of switching circuit
Make；When the enable signal is low level, switching circuit stops working.
The present invention also provides a kind of control method of switching circuit, the switching circuit includes first switch tube, second opens
Guan Guan, third switching tube and the 4th switching tube, first switch tube and second switch first end as switching circuit input terminal or
Person's output end, first switch tube second end are connected with third switching tube first end, and common end is the first common end；Second switch
Pipe second end is connected with the 4th switching tube first end, and common end is the second common end；The third switching tube second end and institute
State the 4th switching tube second end ground connection；First common end and the second common end are separately connected lc circuit or L circuit；First switch
First bridge arm of pipe and third switching tube composition switching circuit, the of second switch and the 4th switching tube composition switching circuit
Two bridge arms, the first common end and the second common end are respectively the middle-end of two bridge arms；
According to the working condition of pattern detection circuit, the operating mode of the switching circuit is selected；The control circuit root
According to the operating mode of switching circuit, the first pulse-width signal and the second pulse-width signal are received, or receives feedback voltage
With the first pulse-width signal, or reception feedback voltage and the second pulse-width signal, worked with controlling the switching circuit
In corresponding modes.
The present invention also provides a kind of wireless charging transmitters, including a kind of control circuit of switching circuit of any of the above.
Compared with prior art, the invention has the following advantages that according to the working condition of pattern detection circuit, described in selection
The operating mode of switching circuit；According to the operating mode of switching circuit, pass through the first pulse-width signal and the second pulsewidth modulation
Signal perhaps passes through feedback voltage and the first pulse-width signal or passes through feedback voltage and the second pulse-width signal, with
The switching circuit work is controlled in corresponding modes.Switching circuit of the present invention can work under various modes, i.e. present invention switch
Circuit can be connected into a variety of circuit-modes.When the present invention is applied in wireless charging, the output voltage of adapter passes through switching circuit
One mode carry out DC converting, then after the voltage after DC converting is carried out inversion by another mode of switching circuit
Output, the present invention only need alteration switch circuit-mode, do not need additional circuit structure.
Detailed description of the invention
Fig. 1 is the control circuit schematic diagram of switching circuit of the present invention；
Fig. 2 is that switching circuit of the present invention works in the circuit diagram of full-bridge inverting mode；
Fig. 3 is that switching circuit of the present invention works in the circuit diagram of two independent half-bridge modes；
Fig. 4 is that switching circuit of the present invention works in the circuit diagram of boost mode and semi-bridge inversion mode；
Fig. 5 is that switching circuit of the present invention works in the circuit diagram of decompression mode and semi-bridge inversion mode；
Specific embodiment
The preferred embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention is not restricted to these
Embodiment.The present invention covers any substitution made in the spirit and scope of the present invention, modification, equivalent method and scheme.
In order to make the public have thorough understanding to the present invention, it is described in detail in the following preferred embodiment of the present invention specific
Details, and the present invention can also be understood completely in description without these details for a person skilled in the art.
The present invention is more specifically described by way of example referring to attached drawing in the following passage.It should be noted that attached drawing is adopted
With more simplified form and using non-accurate ratio, to convenient, the lucidly aid illustration embodiment of the present invention the mesh
's.
As shown in Figure 1, illustrating the control circuit schematic diagram of switching circuit of the present invention, the switching circuit includes described opens
Powered-down road includes first switch tube Q1, second switch Q2, third switching tube Q3 and the 4th switching tube, first switch tube Q1 and
Two switching tube Q2 first ends are as switching circuit input terminal or output end, first switch tube Q1 second end and third switching tube Q3
First end connection, common end are the first common end；Second switch Q2 second end is connected with the 4th switching tube Q4 first end,
Common end is the second common end；The third switching tube Q3 second end and the 4th switching tube Q4 second end ground connection；First is public
End and the second common end are separately connected LC or L circuit (referring to LC the or L circuit in Fig. 2, Fig. 3, Fig. 4 and Fig. 5), first switch altogether
First bridge arm of pipe Q1 and third switching tube Q3 composition switching circuit, second switch Q2 and the 4th switching tube Q4 composition switch
Second bridge arm of circuit, the first common end and the second common end are respectively in the middle-end and second bridge arm of first bridge arm
End.The control circuit include linear voltage-stabilizing circuit U01, pattern detection circuit U02, control module U03, drive module U04 and
Protect circuit U 05.Pattern detection circuit U02 input terminal detects signal MODE, output end connection control mould for reception pattern
Block U03 first input end and drive module U04 first input end.The second input terminal of control module U03 is for receiving feedback voltage
The second input terminal of FB, drive module U04 connects the control module U03 output end, drive module U04 third input terminal and the 4th
Input terminal is respectively used to receive the first pulse-width signal PWM1 and the second pulse-width signal PWM2, drive module U04 output
Four switching tubes of driving signal driving switch circuit.There are three types of working condition, pattern detection circuit works by pattern detection circuit U02
Make in the first state: reception pattern does not detect signal MODE to pattern detection circuit U02, and control module U03 does not receive feedback
Voltage FB, drive module U04 receive the first pulse-width signal PWM1 and the second pulse-width signal PWM2, the first pulsewidth modulation
One bridge arm of signal PWM1 control switch circuit, another bridge arm of the second pulse-width signal PWM2 control switch circuit,
The switching circuit can work in full-bridge inverting mode or two independent semi-bridge inversion modes.Pattern detection circuit work exists
When second of state: the received mode detection signal MODE of pattern detection circuit U02 is low level, and control module U03 receives anti-
Feedthrough voltage FB, first switch tube first end or second switch first end are the output end of a bridge arm of switching circuit, instead
Feedthrough voltage FB characterizes the output voltage of the bridge arm, and feedback voltage FB controls bridge arm work in boost mode；First pulsewidth modulation
Signal PWM1 or the second pulse-width signal PWM2 controls the work of another bridge arm in semi-bridge inversion mode.Pattern detection circuit
In the third state, control module U03 receives feedback voltage FB for work, and feedback voltage FB is characterized in one bridge arm of switching circuit
The average value of voltage at end, feedback voltage FB control bridge arm work in decompression mode, the first modulated signal PWM1 or second
Another bridge arm of modulated signal PWM2 control switch circuit works in semi-bridge inversion mode.Linear voltage-stabilizing circuit U01 input terminal
First switch tube Q1 first end or second switch Q2 first end are connected, output end exports voltage regulation signal LDO.Protect circuit
U05 input terminal receives first switch tube Q1 sample rate current, second switch Q2 sample rate current, first switch tube Q1 first end electricity
Pressure, second switch Q2 first end voltage and temperature detection signal, output end connect drive module U04 input terminal, the guarantor
Protection circuit U05 carries out overvoltage protection, under-voltage protection, overcurrent protection and overheat protector to switching circuit.The control module U03 is also
Enable signal EN is received, when the enable signal EN is high level, switching circuit is worked normally；The enable signal EN is low electricity
Usually, switching circuit stops working.
Fig. 2 illustrates switching circuit of the present invention and works in the circuit diagram of full-bridge inverting mode, first switch tube Q1's
The first end of first end and second switch is input terminal, receives input voltage VIN, and lc circuit is what capacitor C and inductance L was formed
Series circuit, the first common end SW1 of the series circuit first end connection switch circuit, series circuit the second connection switch electricity
The second common end SW2 on road.Switching circuit work can be connected into full bridge inverter in the full-bridge inverting mode i.e. switching circuit,
The corresponding first switch tube Q1 of bridge arm and third switching tube Q3 on the left of first pulse-width signal PWM1 control switch circuit, second
The corresponding second switch Q2 and the 4th switching tube Q4 of bridge arm on the right side of pulse-width signal PWM2 control switch circuit.
Fig. 3 illustrates circuit diagram of the switching circuit work of the present invention in two semi-bridge inversion modes, first switch tube
The first end of Q1 and the first end of second switch Q2 are input terminal, receive input voltage VIN.Lc circuit includes the first lc circuit
With the second lc circuit, the first lc circuit is the series circuit that capacitor C1 and inductance L1 is formed, and series circuit first end connection is opened
Powered-down the first common end of road SW1, series circuit second end ground connection；Second lc circuit is the series connection that capacitor C2 and inductance L2 is formed
Circuit, series circuit first end connection switch circuit the second common end SW2, series circuit second end ground connection.Switch electricity
Road work can be connected into two independent half-bridge inversion circuits, the first arteries and veins in the two independent full-bridge inverting modes i.e. switching circuit
The corresponding first switch tube Q1 and third switching tube Q3 of bridge arm, first switch tube on the left of wide modulated signal PWM1 control switch circuit
Q1, third switching tube Q3 and the first lc circuit form an independent half-bridge inversion circuit；Second pulse-width signal PWM2 control
Bridge arm corresponding second switch Q2 and the 4th switching tube Q4, second switch Q2, the 4th switching tube Q4 on the right side of switching circuit processed
Another independent half-bridge inversion circuit is formed with the second lc circuit.
Fig. 4 illustrates switching circuit of the present invention work in the circuit diagram of boost mode and semi-bridge inversion mode, and first
The first end of switching tube Q1 is the output end of booster circuit, and the first end of second switch Q2 is the input of half-bridge inversion circuit
End, feedback voltage FB characterize the output voltage of circuit under boost mode, and the present embodiment is that voltage is averaged at the first common end SW1
Value.L circuit is the circuit for including inductance, that is, includes inductance L1, and inductance L1 first end receives input voltage VIN, inductance L1 second
Hold the first common end of connection switch circuit SW1；The series circuit of capacitor C2 and inductance L2 composition is lc circuit, the series circuit the
One the second common end of connection switch circuit SW2, series circuit second end ground connection.Switching circuit work is in boost mode and half
The bridge inverter mode i.e. switching circuit can be connected into independent booster circuit and half-bridge inversion circuit, feedback voltage FB control switch electricity
The corresponding first switch tube Q1 and third switching tube Q3 of bridge arm on the left of road, first switch tube, third switching tube Q3 and L circuit composition
One independent booster circuit；The corresponding second switch Q2 of bridge arm on the right side of second pulse-width signal PWM2 control switch circuit
With the 4th switching tube Q4, second switch Q2, the 4th switching tube Q4 and lc circuit form another independent half-bridge inversion circuit.
Fig. 5 illustrates switching circuit of the present invention work in the circuit diagram of decompression mode and semi-bridge inversion mode, and first
The first end of switching tube Q1 is the output end of reduction voltage circuit, and the first end of second switch Q2 is the input of half-bridge inversion circuit
End, feedback voltage FB characterize the output voltage of reduction voltage circuit, and the present embodiment is first switch tube Q1 first end voltage.Lc circuit packet
Include the first lc circuit and the second lc circuit, the first lc circuit includes capacitor C1 and inductance L1, capacitor C1 first end and inductance L1
One end connection, common end are reduction voltage circuit output end, capacitor C1 second end ground connection, inductance L1 second end connection switch circuit the
One common end SW1；Second lc circuit is the series circuit that capacitor C2 and inductance L2 is formed, series circuit the first connection switch electricity
The second common end of road SW2, series circuit second end ground connection.The switching circuit works in decompression mode and semi-bridge inversion mode
The switching circuit can be connected into independent booster circuit and half-bridge inversion circuit, bridge arm pair on the left of feedback voltage FB control switch circuit
The first switch tube Q1 and third switching tube Q3 answered, first switch tube, third switching tube Q3 and the first lc circuit form one solely
Vertical reduction voltage circuit；The corresponding second switch Q2 and the 4th of bridge arm on the right side of second pulse-width signal PWM2 control switch circuit
Switching tube Q4, second switch Q2, the 4th switching tube Q4 and the second lc circuit form another independent half-bridge inversion circuit.
Although embodiment is separately illustrated and is illustrated above, it is related to the common technology in part, in ordinary skill
Personnel apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and the content recorded is not known, then
It can refer to another embodiment on the books.
Embodiments described above does not constitute the restriction to the technical solution protection scope.It is any in above-mentioned implementation
Made modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution within the spirit and principle of mode
Within enclosing.
Claims (12)
1. a kind of control circuit of switching circuit, it is characterised in that: the switching circuit includes first switch tube, second switch
Pipe, third switching tube and the 4th switching tube, first switch tube first end and second switch first end be respectively switching circuit not
With the input terminal or output end of circuit corresponding under operating mode, first switch tube second end and third switching tube first end connect
It connects, common end is the first common end；Second switch second end is connected with the 4th switching tube first end, common end second
Common end；The third switching tube second end and the 4th switching tube second end ground connection；First common end and the second common end
It is separately connected lc circuit or L circuit；First bridge arm of first switch tube and third switching tube composition switching circuit, second opens
Second bridge arm of pipe and the 4th switching tube composition switching circuit is closed, the first common end and the second common end are respectively first bridge
The middle-end of the middle-end of arm and second bridge arm；
The control circuit selects the operating mode of the switching circuit according to the working condition of pattern detection circuit；The control
Circuit processed receives the first pulse-width signal and the second pulse-width signal, or receive according to the operating mode of switching circuit
Feedback voltage and the first pulse-width signal, or feedback voltage and the second pulse-width signal are received, to control the switch
Circuit works in corresponding modes.
2. the control circuit of switching circuit according to claim 1, it is characterised in that: the control circuit includes mode inspection
Slowdown monitoring circuit, there are three types of working condition, the pattern detection circuits to work in the first state for the pattern detection circuit, institute
Switching circuit work is stated in full-bridge inverting mode, or work is in two independent semi-bridge inversion modes；The mode detection electricity
Road works in second of state, the work of a bridge arm of selected on-off circuit in boost mode, selected on-off circuit it is another
A bridge arm work is in semi-bridge inversion mode；The pattern detection circuit work is in the third state, and the one of selected on-off circuit
A bridge arm work works in decompression mode, another bridge arm of selected on-off circuit in semi-bridge inversion mode.
3. the control circuit of switching circuit according to claim 2, it is characterised in that: the control circuit further includes control
Module and drive module, the output end of the control module first input end connection mode detection circuit, the second input terminal are used
In receiving feedback voltage, the drive module first input end connects the pattern detection circuit output end, the drive module
Second input terminal connects the control module output end, and the drive module third input terminal and the 4th input terminal are respectively used to connect
Receive the first pulse-width signal and the second pulse-width signal.
4. the control circuit of switching circuit according to claim 2 or 3, it is characterised in that: pattern detection circuit work exists
When the first state, the control module does not receive feedback voltage, a bridge of the first pulse-width signal control switch circuit
Arm, another bridge arm of the second pulse-width signal control switch circuit, switching circuit work in full-bridge inverting mode or
Person two independent semi-bridge inversion modes.
5. the control circuit of switching circuit according to claim 2 or 3, it is characterised in that: the pattern detection circuit work
Make in second of state, the control module receives feedback voltage, first switch tube first end or second switch first
End is the output end of a bridge arm of switching circuit, and the feedback voltage characterizes the output voltage of the bridge arm, the feedback voltage
Bridge arm work is controlled in boost mode；First pulse-width signal or the second pulse-width signal control switch circuit it is another
One bridge arm work is in semi-bridge inversion mode.
6. the control circuit of switching circuit according to claim 2 or 3, it is characterised in that: the pattern detection circuit work
Make in the third state, the control module receives feedback voltage, a bridge arm of the feedback voltage characterization switching circuit
The average value of voltage at middle-end, the feedback voltage control bridge arm work in decompression mode；First pulse-width signal or
Another bridge arm of second pulse-width signal control switch circuit works in semi-bridge inversion mode.
7. the control circuit of switching circuit according to claim 1,2 or 3, it is characterised in that: the switching circuit work
In full-bridge inverting mode, lc circuit is connected between two middle-ends of two bridge arms of switching circuit；One bridge of switching circuit
Arm works in semi-bridge inversion mode or decompression mode, which connects lc circuit；One bridge arm work of switching circuit
Make in boost mode, the middle-end of the bridge arm connects L circuit.
8. the control circuit of switching circuit according to claim 1,2 or 3, it is characterised in that: the control circuit is also wrapped
Linear voltage-stabilizing circuit, the output end of one bridge arm of the linear voltage-stabilizing circuit input terminal connection switch circuit are included, which is
First switch tube first end or second switch first end；The linear voltage-stabilizing circuit exports voltage of voltage regulation.
9. the control circuit of switching circuit according to claim 1,2 or 3, it is characterised in that: the control circuit is also wrapped
Protection circuit is included, the protection circuit input end reception first switch tube sample rate current, second switch sample rate current, first open
Pipe first end voltage, second switch first end voltage and temperature detection signal are closed, output end connects driving circuit input terminal,
The protection circuit carries out overvoltage protection, under-voltage protection, overcurrent protection and overheat protector to switching circuit.
10. the control circuit of switching circuit according to claim 3, it is characterised in that: the control module receives enabled
Signal, when the enable signal is high level, switching circuit is worked normally；When the enable signal is low level, switching circuit
It stops working.
11. a kind of control method of switching circuit, it is characterised in that: the switching circuit includes first switch tube, second switch
Pipe, third switching tube and the 4th switching tube, first switch tube and second switch first end as switching circuit input terminal or
Output end, first switch tube second end are connected with third switching tube first end, and common end is the first common end；Second switch
Second end is connected with the 4th switching tube first end, and common end is the second common end；The third switching tube second end and described
4th switching tube second end ground connection；First common end and the second common end are separately connected lc circuit or L circuit；First switch tube
With first bridge arm of third switching tube composition switching circuit, the second of second switch and the 4th switching tube composition switching circuit
A bridge arm, the first common end and the second common end are respectively the middle-end of two bridge arms；
According to the working condition of pattern detection circuit, the operating mode of the switching circuit is selected；According to the work of switching circuit
Mode is believed by the first pulse-width signal and the second pulse-width signal, or by feedback voltage and the first pulsewidth modulation
Number, or by feedback voltage and the second pulse-width signal, to control the switching circuit work in corresponding modes.
12. a kind of wireless charging transmitter, it is characterised in that: the control including any one switching circuit in claim 1-10
Circuit.
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| CN201910305166.7A CN110165916A (en) | 2019-04-16 | 2019-04-16 | Control circuit, control method and the wireless charging transmitter using it of switching circuit |
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| CN201910305166.7A CN110165916A (en) | 2019-04-16 | 2019-04-16 | Control circuit, control method and the wireless charging transmitter using it of switching circuit |
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Family
ID=67639509
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| CN201910305166.7A Pending CN110165916A (en) | 2019-04-16 | 2019-04-16 | Control circuit, control method and the wireless charging transmitter using it of switching circuit |
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