CN110311579A - Communication protocol circuits and timesharing current-sensing circuit therein and method - Google Patents
Communication protocol circuits and timesharing current-sensing circuit therein and method Download PDFInfo
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- CN110311579A CN110311579A CN201811066313.1A CN201811066313A CN110311579A CN 110311579 A CN110311579 A CN 110311579A CN 201811066313 A CN201811066313 A CN 201811066313A CN 110311579 A CN110311579 A CN 110311579A
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- communication protocol
- timesharing
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention proposes a kind of communication protocol circuits and timesharing current-sensing circuit therein and method.Timesharing current-sensing circuit includes: current mirroring circuit, has power switch, is coupled between builtin voltage contact and communication protocol voltage point, to supply communication protocol electric current；And sampling switch, it is coupled between builtin voltage contact and reference mode, with timesharing sampling method, during sampling, samples communication protocol electric current, and generate sampling current；Bias circuit provides reference voltage to reference mode to the communication protocol voltage according to communication protocol voltage point during sampling；Signal conversion circuit, to generate timesharing current sense signal according to sampling current；And first switch, it is coupled with sampling switch, to operate during determining sampling；It wherein, is a part of the complete period of power switch supply communication agreement electric current during sampling.
Description
Technical field
The present invention relates to a kind of communication protocol circuits and timesharing current-sensing circuit therein and method, particularly relate to one kind
With the communication protocol circuits and timesharing current-sensing circuit therein of timesharing sampling method sampling communication protocol electric current.The present invention is also
It is related to the timesharing current detection method for communication protocol circuits.
Background technique
Fig. 1 shows a kind of schematic diagram of the flyback type electric source supply device 100 of prior art, wherein alternating voltage Vac via
After rectification circuit 101 rectifies, input voltage vin is generated.The first side winding W1 of transformer 102 receives input voltage vin.Once
Side power switch PSW controls the turn-on time of first side winding W1, and converts in secondary side winding W2 and generate output voltage Vout.
Primary side power switch PSW is controlled by pwm control circuit 105.Pwm control circuit 105 carries out feedback control, pwm control circuit
105 are relevant to output voltage Vout or output electricity by optically coupled circuit 104 or from the acquirement of auxiliary winding mode (not shown)
The feedback voltage signal COMP of stream, and obtained from current sensing circuit 106 and be relevant to the electric current for flowing through primary side power switch PSW
Current sensing signal CS, and generate pwm signal.Pwm control circuit 105 generates switching signal GATE according to pwm signal,
To control the operation of primary side power switch PSW.In order to improve power conversion efficiency, flyback type electric source supply device 100 it is secondary
Side winding W2 is electrically connected synchronous rectification switch circuit 108, by synchronous commutating control circuit 107 according to synchronous rectification switch circuit
108 cross-pressure and control so that secondary side winding W2 conducting when first side winding W1 is not turned on, input voltage vin is turned
It is changed to output voltage Vout.
Fig. 2 shows the schematic diagram of the flyback type electric source supply device 200 of another prior art.With flyback type electric source supply device
100 is different, and flyback type electric source supply device 200 further comprises communication protocol circuits 209.When flyback type electric source supply device 200 to
As charger (such as AC power source adapter) in use, communication protocol circuits 209 exchange information with load circuit 211, and
Communication protocol signals CPS is generated, decides whether to provide communication protocol electric current Ibus to load circuit 211, and with communication protocol electricity
The communication protocol voltage point VBUS on road 209 provides charge power supply.Communication protocol circuits 209 are coupled to communication protocol to confirm
The specification of charge power supply required for load circuit 211 (for example, rechargeable battery) outside voltage point VBUS, if with return
The specification of charge power supply provided by formula of speeding power supply unit 200 is consistent, in order to avoid cause flyback type electric source supply device 200 or load
Circuit damage.
The communication protocol such as meeting USBPD, QC, PumpExpress of communication protocol circuits 209.In addition, flyback power supply
Power supply unit 200 and 100 difference of flyback type electric source supply device, flyback type electric source supply device 100 shown in Fig. 1, feedback electricity
Pressure signal COMP is relevant to output voltage Vout or flows through the output electric current of secondary side winding W2.And flyback shown in Fig. 2
Power supply unit 200, feedback voltage signal COMP, which is relevant to, flows through the builtin voltage contact for being coupled to communication protocol circuits 209
Power switch between VDD and communication protocol voltage point VBUS (open in such as Fig. 2 by 209 inner dotted line power of communication protocol circuits
Shown in pass) communication protocol electric current Ibus.
In prior art flyback type electric source supply device 200 shown in Fig. 2, accurately communication protocol electric current should be maintained
Ibus current sense maintains relatively low power loss again, is choice problem common at present.
In view of this, the present invention i.e. in view of the above shortcomings of the prior art, propose a kind of communication protocol circuits with it is therein
Timesharing current-sensing circuit and method can precisely sense communication protocol electric current Ibus, and relatively low power can be maintained to damage
Consumption.
Summary of the invention
One of viewpoint is sayed, the present invention provides a kind of communication protocol circuits, are used for a flyback type electric source supply device
In, include: an information exchange circuit to exchange information with a load circuit, and generates a communication protocol signals, to determine to be
One communication protocol electric current of no offer gives the load circuit；And a timesharing current-sensing circuit, it is coupled with the information exchange circuit,
To generate a timesharing current sense signal according to the communication protocol electric current；Wherein, the flyback type electric source supply device is according to this point
When current sense signal, an input voltage is converted into an output voltage, and for should communication protocol electric current；Wherein, the timesharing
Current-sensing circuit includes: a current mirroring circuit, has a power switch, is coupled to a builtin voltage contact and a communication protocol
(protocol) between voltage point, for should communication protocol electric current；And a sampling switch, it is coupled to the builtin voltage and connects
Between point and a reference mode, (discrete time sampling) method is sampled with timesharing, during a sampling, sampling should
Communication protocol electric current, and generate a sampling current；One bias circuit is coupled with the sampling switch, to according to the communication protocol
One communication protocol voltage of voltage point, a reference voltage is provided during the sampling and gives the reference mode；One signal conversion electricity
Road is coupled with the bias circuit, to generate a timesharing current sense signal according to the sampling current；And a first switch,
It is coupled with the sampling switch, to operate during determining the sampling；It wherein, is the power switch during the sampling for that should lead to
Believe a part during the one of agreement electric current is complete.
Another viewpoint is sayed, the present invention provides a kind of timesharing current-sensing circuits, are used for a communication protocol circuits, should
Communication protocol circuits in a flyback type electric source supply device, which to have an information exchange circuit, to
One load circuit exchanges information, and generates a communication protocol signals, decides whether that providing a communication protocol electric current gives load electricity
Road；And the timesharing current-sensing circuit, it is coupled with the information exchange circuit, to generate one point according to the communication protocol electric current
When current sense signal；Wherein, which converts an input voltage according to the timesharing current sense signal
For an output voltage, and for should communication protocol electric current；The timesharing current-sensing circuit includes: a current mirroring circuit, has one
Power switch is coupled between a builtin voltage contact and a communication protocol (protocol) voltage point, for that should communicate
Agreement electric current；And a sampling switch, it is coupled between the builtin voltage contact and a reference mode, is sampled with timesharing
(discrete time sampling) method samples the communication protocol electric current during a sampling, and generates a sampling electricity
Stream；One bias circuit is coupled with the sampling switch, to the communication protocol voltage according to the communication protocol voltage point, in
One reference voltage is provided during the sampling and gives the reference mode；One signal conversion circuit is coupled with the bias circuit, to basis
The sampling current generates the timesharing current sense signal；And a first switch, coupled with the sampling switch, to operate with
During determining the sampling；Wherein, during the sampling for the power switch for should communication protocol electric current one it is complete during one
Part.
In a preferred embodiment, which also includes a second switch, with the signal conversion circuit
Coupling, determines to be converted to the sampling current into the timesharing current sense signal to operate.
In a preferred embodiment, which is equal to the communication protocol voltage.
In a preferred embodiment, which includes: a current-to-voltage converting circuit, with the sampling switch coupling
It connects, to be converted to a sampling voltage for the sampling current；And a sample-and-hold circuit, with the current-to-voltage converting circuit
Coupling keeps the sampling voltage to sample, and generates the timesharing current sense signal.
In a preferred embodiment, which includes: a signal switching current mirror circuit, with the sampling switch
Coupling, to be converted to a conversion sampling current for the sampling current；And a sample-and-hold circuit, electricity is converted with the signal
Current mirror circuit coupling keeps the conversion sampling current to sample, and generates the timesharing current sense signal.
Another viewpoint is sayed, present invention provides a kind of timesharing current detection method for communication protocol circuits,
Include: (discrete time sampling) method sampled with timesharing, during a sampling, samples a communication protocol electric current,
And a sampling current is generated, wherein a power switch, is coupled to a builtin voltage contact and a communication protocol (protocol) electricity
Between crimping point, for should communication protocol electric current；According to a communication protocol voltage of the communication protocol voltage point, taken in this
A reference voltage is provided during sample to a reference mode, and the sampling current flows through the reference mode；According to the sampling current, produce
A raw timesharing current sense signal；And one first switch of operation is during determining the sampling；It wherein, is the function during the sampling
Rate switch for should communication protocol electric current one it is complete during a part.
In a preferred embodiment, timesharing current detection method for being used for communication protocol circuits, also comprising operation one the
Two switch and determine the sampling current being converted to the timesharing current sense signal.
In a preferred embodiment, which is equal to the communication protocol voltage.
In a preferred embodiment, the step of this is according to the sampling current, generates a timesharing current sense signal include: by
The sampling current is converted to a sampling voltage；And sampling keeps the sampling voltage, and generate the timesharing current sense signal.
In a preferred embodiment, the step of this is according to the sampling current, generates a timesharing current sense signal include: by
The sampling current is converted to a conversion sampling current；And sampling keeps the conversion sampling current, and generate the timesharing electric current and detect
Survey signal.
Below by way of specific embodiment elaborate, should be easier to understand the purpose of the present invention, technology contents, feature and
The effect of it is realized.
Detailed description of the invention
Fig. 1 shows a kind of schematic diagram of the flyback type electric source supply device 100 of prior art.
Fig. 2 shows the schematic diagram of the flyback type electric source supply device 200 of another prior art.
Fig. 3 shows the schematic diagram of flyback type electric source supply device 300 according to the present invention.
Fig. 4 A and Fig. 4 B shows the schematic diagram of timesharing current-sensing circuit 410 and signal waveform according to the present invention respectively.
Fig. 5 A and Fig. 5 B shows the schematic diagram of timesharing current-sensing circuit 510 and signal waveform according to the present invention respectively.
Fig. 6 A and Fig. 6 B shows the schematic diagram of timesharing current-sensing circuit 610 and signal waveform according to the present invention respectively.
Fig. 7 A and Fig. 7 B shows the schematic diagram of timesharing current-sensing circuit 710 and signal waveform according to the present invention respectively.
Specific embodiment
Attached drawing in the present invention belongs to signal, is mostly intended to indicate coupling relationship and each signal waveform between each circuit
Between relationship, as circuit, signal waveform and frequency then and not according to ratio draw.
Referring to Fig. 3, being as shown in the figure the schematic diagram of flyback type electric source supply device 300 according to the present invention.As shown,
Flyback type electric source supply device 300 include rectification circuit 101, transformer 102, primary side power switch PSW, optically coupled circuit 104,
Pulsewidth modulation (pulse width modulation, PWM) control circuit 105, primary side current sensing circuit 106, synchronize it is whole
Flow control circuit 107, synchronous rectification switch circuit 108 and communication protocol circuits 309.
Transformer 102 has first side winding W1 and secondary side winding W2, and wherein first side winding W1 is defeated to receive one
Enter voltage Vin, secondary side winding W2 is to generate output voltage Vout.In one embodiment, input voltage vin can be by rectified current
Alternating voltage Vac is rectified and is generated by road 101.Primary side power switch PSW is coupled to first side winding W1.Pwm control circuit
105 are located at the primary side of transformer 102, according to current sensing signal CS and feedback voltage signal COMP, with the modulation such as such as PWM
Mode and generate switch control signal GATE to control primary side power switch PSW.In order to improve power conversion efficiency, flyback
The secondary side winding W2 of power supply unit 300 is electrically connected synchronous rectification switch circuit 108, by synchronous commutating control circuit 107
It is controlled according to the cross-pressure of synchronous rectification switch circuit 108, so that secondary side winding W2 conducting when first side winding W1 is not turned on,
Input voltage vin is converted to output voltage Vout.
Please continue to refer to Fig. 3, flyback type electric source supply device 300 includes communication protocol circuits 309.Communication protocol circuits 309
Communication protocol voltage point VBUS for example to provide charge power supply.Communication protocol circuits 309 are coupled to communication to confirm
The rule of charge power supply required for the load circuit 211 (for example, rechargeable battery) coupled outside voltage protocol contact VBUS
Lattice, if it is consistent with the specification of charge power supply provided by flyback type electric source supply device 300, in order to avoid cause flyback type electric source supply
Device 300 or load circuit 211 damage.The communication protocol such as meeting USBPD, QC, PumpExpress of communication protocol circuits 309.
In addition, feedback voltage signal COMP, which is relevant to, flows through coupling in flyback type electric source supply device 300 shown in Fig. 3
Power switch SW1's between the builtin voltage contact VDD and communication protocol voltage point VBUS of communication protocol circuits 309 is logical
Believe agreement electric current Ibus.It should be noted that communication protocol circuits 309 for example can also not do any sound according to load circuit 211
It is answering as a result, selecting fixed specification, such as the charge power supply of the fixed current in 5 volts of voltage (V), 0~2 ampere (A).
Wherein, communication protocol circuits 309 generate an optical coupling signal in optical coupling according to timesharing current sense signal TDCS
Contact OPT, and in a manner of optical coupling, feedback voltage signal COMP is generated, sends pulsewidth modulation to via optically coupled circuit 104
(pulse width modulation, PWM) controller 105.Wherein PWM controller 105 (should according to feedback voltage signal COMP
Optical coupling signal), primary side power switch PSW is operated, and input voltage vin is converted into output voltage Vout to communication protocol
The builtin voltage contact VDD of circuit 309, and supply communication agreement electric current Ibus flows through builtin voltage contact VDD and communication protocol
Between voltage point VBUS.
Wherein, communication protocol circuits 309 include timesharing current-sensing circuit 310 and information exchange circuit 312.Information exchange
Circuit 312 generates communication protocol signals CPS to exchange information with load circuit 211, to decide whether to provide communication protocol
Electric current Ibus is to load circuit 211.Timesharing current-sensing circuit 310 and information exchange circuit 312 couple, to according to communication protocols
It discusses electric current Ibus and generates timesharing current sense signal TDCS.Current-sensing circuit 310 includes current mirroring circuit 3101, bias circuit
3102, signal conversion circuit 3103 and first switch S1.
Wherein, current mirroring circuit 3101 has power switch SW1 and sampling switch SW2.Power switch SW1 is coupled to inside
Between voltage point VDD and communication protocol voltage point VBUS, to be operable for answering communication protocols according to communication protocol signals CPS
Discuss electric current Ibus.Sampling switch SW2 is coupled between builtin voltage contact VDD and reference mode VBR, with timesharing sampling method,
During sampling (such as between time point t1 and t2, t3 and t4 shown in Fig. 4 B during), communication protocol electric current Ibus is sampled,
And generate sampling current ISEN.Bias circuit 3102 and sampling switch SW2 are coupled, to according to communication protocol voltage point VBUS
Communication protocol voltage, during sampling provide reference voltage VREF give reference mode VBR.
Signal conversion circuit 3103 and bias circuit 3102 couple, to generate timesharing electric current according to sampling current ISEN
Detection signal TDCS.First switch S1 and sampling switch SW2 are coupled, to operate with during determining sampling (such as shown in Fig. 4 B
Time point t1 and t2, between t3 and t4 during).It wherein, is power switch SW1 supply communication agreement electric current during sampling
A part during the one of Ibus is complete.
The present invention during sampling, samples communication protocol electric current Ibus using timesharing sampling method；In this way, compared to
Low consumed power, can drop in the mode of full time sampling.For another aspect, the present invention is using timesharing sampling method in taking
During sample, communication protocol electric current Ibus is sampled, CTR current transfer ratio (M:1 as shown in Figure 4 A) can also be reduced, to increase
The accuracy of sensing.Such as CTR current transfer ratio can be set as M:1=100:1, because being timesharing sampling, compared to full-time
Sampling method can improve efficiency to avoid waste of energy, also avoid system overheat；It is set when compared to by full-time sampling method
CTR current transfer ratio is set as M:1=1000:1, and accuracy is relatively high.
Fig. 4 A and Fig. 4 B shows the schematic diagram of timesharing current-sensing circuit 410 and signal waveform according to the present invention respectively.
It is a kind of specific implementation of the timesharing current-sensing circuit 410 for flyback type electric source supply device of the invention shown in Fig. 4 A
Example.As shown, current-sensing circuit 410 include current mirroring circuit 4101, bias circuit 4102, signal conversion circuit 4103,
First switch S1 and second switch S2.
Wherein, current mirroring circuit 4101 has power switch SW1 and sampling switch SW2.Power switch SW1 is coupled to inside
Between voltage point VDD and communication protocol voltage point VBUS, to be operable for answering communication protocols according to communication protocol signals CPS
Discuss electric current Ibus.Sampling switch SW2 is coupled between builtin voltage contact VDD and reference mode VBR, with timesharing sampling method,
During sampling (such as between time point t1 and t2, t3 and t4 shown in Fig. 4 B during), communication protocol electric current Ibus is sampled,
And generate sampling current ISEN.
It should be noted that current mirroring circuit 4101 has diode (diode-connected) MOS element with general
Exemplary currents mirror circuits it is different.In typical current mirroring circuit, power switch SW1 can take diode MOS element
Electric connection mode, but in the present embodiment, power switch SW1 is not the electric connection mode for taking diode MOS element,
But the electric current outflow end (reference mode VBR) of sampling switch SW2 is adjusted in electricity identical as communication protocol voltage point VBUS
Press the function to realize current mirroring circuit.
Bias circuit 4102 and sampling switch SW2 are coupled, to the communication protocol according to communication protocol voltage point VBUS
Voltage provides reference voltage VREF during sampling and gives reference mode VBR.Signal conversion circuit 4103 and 4102 coupling of bias circuit
It connects, to generate timesharing current sense signal TDCS according to sampling current ISEN.First switch S1 and sampling switch SW2 is coupled,
To operate during determining sampling (such as between time point t1 and t2, t3 and t4 shown in Fig. 4 B during).Wherein, it samples
The a part for the complete period that period is power switch SW1 supply communication agreement electric current Ibus.In a kind of preferred embodiment
In, 1/10th of complete period is such as, but not limited to less than during sampling.
In the present embodiment, first switch S1 be coupled to the switch SW3 in reference mode VBR and bias circuit 4102 it
Between.Compared to timesharing current-sensing circuit 310 shown in Fig. 3, timesharing current-sensing circuit 410 also includes second switch S2, with
Signal conversion circuit 4103 couples, and determines to be converted to sampling current ISEN into timesharing current sense signal TDCS to operate.
As shown in Figure 4 A, bias circuit 4102 is for example with operational amplifier Q1 and switch SW3.Operational amplifier Q1 according to
The voltage of communication protocol voltage point VBUS, and reverse input end is electrically connected to reference mode VBR, operational amplifier Q1's is defeated
The reference voltage VREF of reference mode VBR during sampling, is adjusted to and communication protocol voltage by outlet control switch SW3
The voltage of contact VBUS is equal.
In a preferred embodiment, signal conversion circuit 4103 for example including current-to-voltage converting circuit (such as but not
It is limited to for resistance R1 as shown in the figure) and sample-and-hold circuit.Current-to-voltage converting circuit is during sampling, with sampling switch
SW2 coupling, to be converted to sampling voltage VSEN for sampling current ISEN.As shown, during sampling, i.e. time point t1
Between t2 or between time point t3 and t4, current-to-voltage converting circuit, i.e. resistance R1 are coupled to sampling switch SW2 and connect
Between ground potential GND, sampling current ISEN flows through resistance R1, generates sampling voltage VSEN.
Sample-and-hold circuit, inductance C1 such as, but not limited to as shown in the figure are coupled with current-to-voltage converting circuit, are used
Sampling voltage VSEN is kept with sampling, and generates timesharing current sense signal TDCS, so that communication protocol circuits 309 are according to timesharing
Current sense signal TDCS generates optical coupling signal in optical coupling contact OPT, and in a manner of optical coupling, generates feedback voltage signal
COMP sends pulsewidth modulation (pulse width modulation, PWM) controller 105 to via optically coupled circuit 104.
Fig. 5 A and Fig. 5 B shows the schematic diagram of timesharing current-sensing circuit 510 and signal waveform according to the present invention respectively.
It is a kind of specific implementation of the timesharing current-sensing circuit 510 for flyback type electric source supply device of the invention shown in Fig. 5 A
Example.As shown, current-sensing circuit 510 include current mirroring circuit 5101, bias circuit 5102, signal conversion circuit 5103,
First switch S1 and second switch S2.
Wherein, current mirroring circuit 5101 has power switch SW1 and sampling switch SW2.Power switch SW1 is coupled to inside
Between voltage point VDD and communication protocol voltage point VBUS, to be operable for answering communication protocols according to communication protocol signals CPS
Discuss electric current Ibus.Sampling switch SW2 is coupled between builtin voltage contact VDD and reference mode VBR, with timesharing sampling method,
During sampling (such as between time point t1 and t2, t3 and t4 shown in Fig. 5 B during), communication protocol electric current Ibus is sampled,
And generate sampling current ISEN.
Bias circuit 5102 and sampling switch SW2 are coupled, to the communication protocol according to communication protocol voltage point VBUS
Voltage provides reference voltage VREF during sampling and gives reference mode VBR.Signal conversion circuit 5103 and 5102 coupling of bias circuit
It connects, to generate timesharing current sense signal TDCS according to sampling current ISEN.First switch S1 and sampling switch SW2 is coupled,
To operate during determining sampling (such as between time point t1 and t2, t3 and t4 shown in Fig. 5 B during).Wherein, it samples
The a part for the complete period that period is power switch SW1 supply communication agreement electric current Ibus.
The present embodiment and embodiment difference shown in Fig. 4 A, in the present embodiment, first switch S1 is coupled to power
Between switch SW1 and sampling switch SW2, but it is identical as the first switch S1 effect of embodiment shown in Fig. 4 A, be all to
Operation is during determining sampling.
Fig. 6 A and Fig. 6 B shows the schematic diagram of timesharing current-sensing circuit 610 and signal waveform according to the present invention respectively.
It is a kind of specific implementation of the timesharing current-sensing circuit 610 for flyback type electric source supply device of the invention shown in Fig. 6 A
Example.As shown, current-sensing circuit 610 include current mirroring circuit 6101, bias circuit 6102, signal conversion circuit 6103,
First switch S1 and second switch S2.
Wherein, current mirroring circuit 6101 has power switch SW1 and sampling switch SW2.Power switch SW1 is coupled to inside
Between voltage point VDD and communication protocol voltage point VBUS, to be operable for answering communication protocols according to communication protocol signals CPS
Discuss electric current Ibus.Sampling switch SW2 is coupled between builtin voltage contact VDD and reference mode VBR, with timesharing sampling method,
During sampling (such as between time point t1 and t2, t3 and t4 shown in Fig. 6 B during), communication protocol electric current Ibus is sampled,
And generate sampling current ISEN.
Bias circuit 6102 and sampling switch SW2 are coupled, to the communication protocol according to communication protocol voltage point VBUS
Voltage provides reference voltage VREF during sampling and gives reference mode VBR.Signal conversion circuit 6103 and 6102 coupling of bias circuit
It connects, to generate timesharing current sense signal TDCS according to sampling current ISEN.First switch S1 and sampling switch SW2 is coupled,
To operate during determining sampling (such as between time point t1 and t2, t3 and t4 shown in Fig. 5 B during).Wherein, it samples
A part for the complete period that period is power switch SW1 supply communication agreement electric current Ibus, in a kind of preferable embodiment party
In formula, 1/10th of complete period is such as, but not limited to less than during sampling.
Different from embodiment shown in Fig. 4 A, in the present embodiment, current-to-voltage converting circuit includes switch S3 and capacitor
C2, during sampling, switch S2 and S3 is all not turned on, and sampling current ISEN charges to capacitor C2；And during sampling after when
Between during point t2 to t5, time point t4 to t6, switch S2 conducting and switch S3 holding is not turned on, make electric current IFB to capacitor C3
(sampling protection circuit) charging, generates timesharing current sense signal TDCS.
Fig. 7 A and Fig. 7 B shows the schematic diagram of timesharing current-sensing circuit 710 and signal waveform according to the present invention respectively.
It is a kind of specific implementation of the timesharing current-sensing circuit 710 for flyback type electric source supply device of the invention shown in Fig. 7 A
Example.As shown, current-sensing circuit 710 include current mirroring circuit 7101, bias circuit 7102, signal conversion circuit 7103,
First switch S1 and second switch S2.
Wherein, current mirroring circuit 7101 has power switch SW1 and sampling switch SW2.Power switch SW1 is coupled to inside
Between voltage point VDD and communication protocol voltage point VBUS, to be operable for answering communication protocols according to communication protocol signals CPS
Discuss electric current Ibus.Sampling switch SW2 is coupled between builtin voltage contact VDD and reference mode VBR, with timesharing sampling method,
During sampling (such as between time point t1 and t2, t3 and t4 shown in Fig. 7 B during), communication protocol electric current Ibus is sampled,
And generate sampling current ISEN.
Bias circuit 7102 and sampling switch SW2 are coupled, to the communication protocol according to communication protocol voltage point VBUS
Voltage provides reference voltage VREF during sampling and gives reference mode VBR.Signal conversion circuit 7103 and 7102 coupling of bias circuit
It connects, to generate timesharing current sense signal TDCS according to sampling current ISEN.First switch S1 and sampling switch SW2 is coupled,
To operate during determining sampling (such as between time point t1 and t2, t3 and t4 shown in Fig. 7 B during).Wherein, it samples
A part for the complete period that period is power switch SW1 supply communication agreement electric current Ibus, in a kind of preferable embodiment party
In formula, 1/10th of complete period is such as, but not limited to less than during sampling.
Different from embodiment shown in Fig. 4 A, in the present embodiment, signal conversion circuit 7103 includes signal switching current
Mirror circuit (such as being formed by the switch SW4 and SW5 in Fig. 7 A) and sample-and-hold circuit (capacitor C3 as shown in Figure 7 A).Letter
Number switching current mirror circuit is coupled with sampling switch SW2, to be converted to conversion sampling current ITD for sampling current ISEN.
Sample-and-hold circuit and signal switching current mirror circuit couple, and keep conversion sampling current ITD to sample, and generate timesharing electricity
Flow detection signal TDCS.
In detail, conversion sampling current ITD is determined by the grid-source voltage (Vgs) of switch SW5；During sampling, open
S2 conducting is closed, sampling current ISEN determines switch SW4, i.e., is as shown in Figure 7 A diode (diode-connected)
MOS element, the grid-source voltage (Vgs) with switch SW5, therefore, communication protocol electric current Ibus determines conversion sampling current
ITD, in a kind of preferred embodiment, conversion sampling current ITD is proportional to communication protocol electric current Ibus.When switch S2 is not led
It is logical, the grid-source voltage (Vgs) of switch SW5 due to capacitor C3 reason and be kept so that sampling keeps conversion sampling electricity
The stream relative timesharing current sense signal TDCS of ITD is held up, and in a kind of preferred embodiment, sampling keeps conversion
Sampling current ITD is equal to timesharing current sense signal TDCS.
Illustrate the present invention for preferred embodiment above, but described above, is only easy to those skilled in the art
Understand the contents of the present invention, interest field not for the purpose of limiting the invention.Illustrated each embodiment, however it is not limited to individually
Using, it can also be with combined application, for example, two or more embodiments can be with united application, and the portion in an embodiment
It is grouped as and is also substituted for corresponding building block in another embodiment.In addition, under same spirit of the invention, this field
Technical staff is contemplated that various equivalence changes and various combinations, and for example, the current mirroring circuit in previous embodiment is simultaneously
It is not limited to shown MOS transistor, can also be replaced with all kinds of switches such as BJT or JFET." according to certain letter alleged by the present invention
Number carry out processing or operation or generate certain output result ", be not limited to according to the signal itself, also comprising when necessary, by this
Signal carry out Voltage to current transducer, Current Voltage conversion and/or ratio conversion etc., later according to the signal after conversion at
Reason or operation generate certain output result.It follows that under same spirit of the invention, it may occur to persons skilled in the art that respectively
Kind equivalence changes and various combinations, there are many a combination thereof mode, explanation numerous to list herein.Therefore, the scope of the present invention is answered
Cover above-mentioned and other all equivalence changes.
Claims (15)
1. a kind of communication protocol circuits, for including in a flyback type electric source supply device:
One information exchange circuit to exchange information with a load circuit, and generates a communication protocol signals, to decide whether to mention
The load circuit is given for a communication protocol electric current；And
One timesharing current-sensing circuit is coupled with the information exchange circuit, to generate a timesharing according to the communication protocol electric current
Current sense signal；
Wherein, which is converted to output electricity for an input voltage according to the timesharing current sense signal
Pressure, and supplying should communication protocol electric current；
Wherein, which includes:
One current mirroring circuit has a power switch, is coupled between a builtin voltage contact and a communication protocol voltage point,
For should communication protocol electric current；And a sampling switch, be coupled between the builtin voltage contact and a reference mode, with point
When sampling method sample the communication protocol electric current during a sampling, and generate a sampling current；
One bias circuit is coupled with the sampling switch, to the communication protocol voltage according to the communication protocol voltage point, in
One reference voltage is provided during the sampling and gives the reference mode；
One signal conversion circuit is coupled with the bias circuit, to generate timesharing current sense letter according to the sampling current
Number；And
One first switch is coupled with the sampling switch, to operate during determining the sampling；
Wherein, during the sampling for the power switch for should communication protocol electric current one it is complete during a part.
2. communication protocol circuits as described in claim 1, wherein the timesharing current-sensing circuit also includes a second switch, with
Signal conversion circuit coupling, determines to be converted to the sampling current into the timesharing current sense signal to operate.
3. communication protocol circuits as described in claim 1, wherein the reference voltage is equal to the communication protocol voltage.
4. communication protocol circuits as described in claim 1, wherein the signal conversion circuit includes:
One current-to-voltage converting circuit is coupled with the sampling switch, to be converted to a sampling voltage for the sampling current；With
And
One sample-and-hold circuit is coupled with the current-to-voltage converting circuit, keeps the sampling voltage to sample, and generates this point
When current sense signal.
5. communication protocol circuits as described in claim 1, wherein the signal conversion circuit includes:
One signal switching current mirror circuit is coupled with the sampling switch, to be converted to conversion sampling electricity for the sampling current
Stream；And
One sample-and-hold circuit is coupled with the signal switching current mirror circuit, keeps the conversion sampling current to sample, and is produced
The raw timesharing current sense signal.
6. a kind of timesharing current-sensing circuit, is used for a communication protocol circuits, which is used for a flyback power supply
In power supply unit, which has an information exchange circuit, and to exchange information with a load circuit, and it is logical to generate one
Believe protocol signal, decides whether that providing a communication protocol electric current gives the load circuit；And the timesharing current-sensing circuit, with this
Information exchange circuit coupling, to generate a timesharing current sense signal according to the communication protocol electric current；Wherein, flyback electricity
Source power supply unit is converted to an output voltage according to the timesharing current sense signal, by an input voltage, and supplying should communication protocol
Electric current；The timesharing current-sensing circuit includes:
One current mirroring circuit has a power switch, is coupled between a builtin voltage contact and a communication protocol voltage point,
For should communication protocol electric current；And a sampling switch, be coupled between the builtin voltage contact and a reference mode, with point
When sampling method sample the communication protocol electric current during a sampling, and generate a sampling current；
One bias circuit is coupled with the sampling switch, to the communication protocol voltage according to the communication protocol voltage point, in
One reference voltage is provided during the sampling and gives the reference mode；
One signal conversion circuit is coupled with the bias circuit, according to the sampling current, to generate timesharing current sense letter
Number；And
One first switch is coupled with the sampling switch, to operate during determining the sampling；
Wherein, during the sampling for the power switch for should communication protocol electric current one it is complete during a part.
7. timesharing current-sensing circuit as claimed in claim 6 includes also a second switch, with the signal conversion circuit coupling
It connects, determines to be converted to the sampling current into the timesharing current sense signal to operate.
8. timesharing current-sensing circuit as claimed in claim 6, wherein the reference voltage is equal to the communication protocol voltage.
9. timesharing current-sensing circuit as claimed in claim 6, wherein the signal conversion circuit includes:
One current-to-voltage converting circuit is coupled with the sampling switch, to be converted to a sampling voltage for the sampling current；With
And
One sample-and-hold circuit is coupled with the current-to-voltage converting circuit, keeps the sampling voltage to sample, and generates this point
When current sense signal.
10. timesharing current-sensing circuit as claimed in claim 6, wherein the signal conversion circuit includes:
One signal switching current mirror circuit is coupled with the sampling switch, to be converted to conversion sampling electricity for the sampling current
Stream；And
One sample-and-hold circuit is coupled with the signal switching current mirror circuit, keeps the conversion sampling current to sample, and is produced
The raw timesharing current sense signal.
11. a kind of timesharing current detection method for communication protocol circuits, includes:
With timesharing sampling method, during a sampling, a communication protocol electric current is sampled, and generates a sampling current, wherein a function
Rate switch, is coupled between a builtin voltage contact and a communication protocol voltage point, for should communication protocol electric current；
According to a communication protocol voltage of the communication protocol voltage point, a reference voltage is provided during the sampling to a reference
Node, and the sampling current flows through the reference mode；
According to the sampling current, a timesharing current sense signal is generated；And
A first switch is operated during determining the sampling；
Wherein, during the sampling for the power switch for should communication protocol electric current one it is complete during a part.
12. the timesharing current detection method of communication protocol circuits is used for as claimed in claim 11, also comprising operation one second
It switchs and determines the sampling current being converted to the timesharing current sense signal.
13. being used for the timesharing current detection method of communication protocol circuits as claimed in claim 11, wherein the reference voltage etc.
In the communication protocol voltage.
14. being used for the timesharing current detection method of communication protocol circuits as claimed in claim 11, wherein this is according to the sampling
Electric current, generate a timesharing current sense signal the step of include:
By the sampling current, a sampling voltage is converted to；And
Sampling keeps the sampling voltage, and generates the timesharing current sense signal.
15. being used for the timesharing current detection method of communication protocol circuits as claimed in claim 11, wherein this is according to the sampling
Electric current, generate a timesharing current sense signal the step of include:
By the sampling current, a conversion sampling current is converted to；And
Sampling keeps the conversion sampling current, and generates the timesharing current sense signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US16/219,831 US10505464B2 (en) | 2018-03-25 | 2018-12-13 | Communication protocol circuit and discrete-time current sense circuit and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201862647805P | 2018-03-25 | 2018-03-25 | |
| US62/647,805 | 2018-03-25 |
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