CN106533398A - Trapezoidal wave generating circuit used for USB PD controller - Google Patents
Trapezoidal wave generating circuit used for USB PD controller Download PDFInfo
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- CN106533398A CN106533398A CN201610826419.1A CN201610826419A CN106533398A CN 106533398 A CN106533398 A CN 106533398A CN 201610826419 A CN201610826419 A CN 201610826419A CN 106533398 A CN106533398 A CN 106533398A
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- circuit
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- wave generation
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K4/00—Generating pulses having essentially a finite slope or stepped portions
- H03K4/02—Generating pulses having essentially a finite slope or stepped portions having stepped portions, e.g. staircase waveform
- H03K4/026—Generating pulses having essentially a finite slope or stepped portions having stepped portions, e.g. staircase waveform using digital techniques
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- Electronic Switches (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a trapezoidal wave generating circuit used for a USB PD controller. The circuit comprises a square signal input, a first square wave generating circuit and a second square wave generating circuit which are connected in parallel, and switching circuits, wherein each of the first square wave generating circuit and the second square wave generating circuit is formed by a charging and discharging circuit and a current source circuit; the charging and discharging circuits and the current source circuits are connected to a power supply VDD in series at a ground terminal; the square signal input is respectively connected to two charging and discharging circuits; the switching circuits are connected behind the first square wave generating circuit and the second square wave generating circuit; and the two switching circuits are connected in parallel to output a trapezoidal wave signal VOUT together. The trapezoidal wave generating circuit realized by the invention can generate strong trapezoidal wave with more stable edge time and solves a problem of physical layer communication in a USB PD protocol and is particularly suitable for the USB PD controller.
Description
Technical field
The invention belongs to electronic technology field, more particularly to a kind of USB interface control based on Power Delivery agreements
Device processed.
Background technology
The consumption electronic products such as mobile phone, panel computer occupy more and more important position in daily life
Put, usage frequency and duration are all dramatically increased, and power consumption also day by day increases.And it is limited to slow of material and electrochemical industry
Exhibition, the lifting improvement speed of battery are slower, and battery capacity can not increasingly meet consumer demand, cause charge frequency more next
It is higher.Battery capacity is discontented with for mitigating consumer, the method for shortening battery charge time is constantly studied by Ge great electronics firms.
At present, more ripe rapid nitriding include QC (Quick Charge) standards that Qualcomm proposes and
Max Charge standards that TI companies propose etc..But, these standards only belong to individual businesses, it is difficult to become industry unification mark
It is accurate.USB-IF (USB Implementers Forum, USB application persons forum) announces USB Power for the first time in July, 2012
1.0 protocol specifications of Delivery (PD), set 5 kinds of power settings ranks (Profile 1～5), reach as high as 100 watts of electricity
Power transmission quantity, and, feeder ear (Source) and power connection end (Sink) have can mutually to the power supply of reversible supply characteristic,
Such that it is able to allow various power devices can meet power demands by a USB cable, the shortening device charging interval simultaneously optimizes
The convenience of mobile applications.USB PD protocol specifications can also be with existing USB 3.0/2.0, BC1.2/1.1/1.0 charging specifications
It is compatible.This agreement obtains the support of the major companies such as Intel, Hewlett-Packard, ST microelectronics, auspicious Sa electronics, Microsoft, is expected to become capable
The unified standard of industry, and 3.0 versions have been issued in 2016.
Charging handshake procedure based on USB PD agreements is as follows：USB of the adapter with electrical equipment by TYPE-C standards
Cable sets up the connection of CC interfaces, and adapter acquiescence exports 5V to electrical equipment, carries out small current and charge at a slow speed.Adapter and electricity consumption
Equipment carries out physical layer communication by CC interfaces, and electrical equipment informs the charging voltage required for adapter and electric current, if suitable
Orchestration has this power supply capacity, then adjust charging voltage and electric current.It can be seen that, physical layer communication is that UDB PD agreements can be normally carried out
Basis.
As patent application 200920029063.4 discloses a kind of staircase generator of integrating circuit control, can including one
Programmed logic control circuit (PLD), an integrating circuit, two comparison circuits, five analog switches, the product that this utility model is provided
The staircase generator of parallel circuit control, using pure hardware controls, reaches good slope waveform, logic control using integrating circuit
The good flex point switching of circuit realiration processed, is not take up software resource, and has reached the theoretical smooth output for 0 of slope resolving power imitating
Really, several key factors：Height, rise and fall rate, cycle can be independently arranged, and application is more flexible.Although this application
In propose rising edge trapezoidal wave and trailing edge trapezoidal wave.Then, only rising edge slowly climb or only trailing edge it is slow under
The waveform of drop can not calculate " trapezoidal " ripple, and the trapezoidal wave is easily affected by interface parasitic capacitance, causes edge time to change
It is larger, so as to not be suitable for USB PD control devices.
It is a kind of important to need solution badly that trapezoidal wave based on BMC (Biphase Mark Coding) physical layer produces problem
Problem certainly.BMC communicating requirements send and receive the trapezoidal wave that representative value is 1.1V on CC interfaces, and require the side of trapezoidal wave
Along the time in 300nS or so.Generally, the edge time of signal is easily affected by CC interface parasitic capacitances, parasitic capacitance compared with
Edge time when big is longer, and edge time when parasitic capacitance is less is shorter.If design is improper, the edge of trapezoidal wave can be by
Change in different electrical equipments, so as to cause communication failure because agreement is unsatisfactory for.
The content of the invention
Based on this, the primary purpose of the present invention is to provide a kind of trapezoidal wave generation circuit for USB PD control devices, with
Solve the problems, such as that the physical layer communication in USB PD agreements, the i.e. trapezoidal wave based on BMC physical layers produce problem.
Another mesh ground of the present invention is to provide a kind of trapezoidal wave generation circuit for USB PD control devices, the circuit
A relatively stable trapezoidal wave of stalwartness, edge time can be exported, is particularly suitable for USB PD control devices.
For achieving the above object, the technical scheme is that：
A kind of trapezoidal wave generation circuit for USB PD control devices, which includes the input of square-wave signal all the way, in parallel
First square wave generation circuit and the second square wave generation circuit, on-off circuit；Wherein, first square wave generation circuit and second party
Wave generation circuit is constituted by charge-discharge circuit and current source circuit, and the charge-discharge circuit is series at power supply with current source circuit
VDD is in earth terminal；The square-wave signal input connects two charge-discharge circuits respectively, and the two-way current source circuit is parallel to power supply
On VDD, and the first square wave generation circuit and the second square wave generation circuit have been followed by on-off circuit, and two on-off circuits are connected in parallel on one
Play common output trapezoidal wave signal VOUT.
The current source circuit is made up of PMOS or NMOS tube, the sources connected in parallel of PMOS or NMOS tube in together,
Input is terminated at power supply, and outfan is then connected to charge-discharge circuit.
The charge-discharge circuit is that electric capacity and metal-oxide-semiconductor are constituted, and wherein, the source electrode of metal-oxide-semiconductor is connected to square-wave signal input, electricity
Appearance is connected to the input of metal-oxide-semiconductor.
Further, the electric capacity is connected between the input of metal-oxide-semiconductor and earth terminal.
Further, the electric capacity is connected between the input of metal-oxide-semiconductor and power vd D.
Further, the metal-oxide-semiconductor of the charge-discharge circuit of first square wave generation circuit is connected to square-wave signal input, the
The charge-discharge circuit of two square wave generation circuits is then connected to the input of square-wave signal by phase inverter.
The on-off circuit, is realized by NMOS tube.
Further, one of NMOS tube of the on-off circuit is connected to electric capacity.
The trapezoidal wave generation circuit realized by the present invention, can be using the rising produced the characteristics of rectangular wave needed for trapezoidal wave
Along, trailing edge, and the trapezoidal wave for producing is healthy and strong, edge time is relatively stable, and the physical layer communication solved in USB PD agreements is asked
Topic, is particularly suitable for USB PD control devices.
And the present invention realizes that circuit is simple, it is easy to accomplish.
Description of the drawings
Fig. 1 is the circuit diagram of institute's embodiment of the present invention.
Fig. 2 is the oscillogram of institute's embodiment of the present invention.
Fig. 3 is the circuit diagram of institute's embodiment of the present invention two.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, it is below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, and
It is not used in the restriction present invention.
Shown in Fig. 1, the first realization for the trapezoidal wave generation circuit for USB PD control devices implemented by the present invention
Scheme (abbreviation scheme one), which includes square-wave signal VCK inputs, the first square wave generation circuit in parallel and the second square wave all the way
Produce circuit, on-off circuit.
First square wave generation circuit and the second square wave generation circuit are constituted by charge-discharge circuit and current source circuit, charge and discharge
Circuit is series at power vd D in earth terminal with current source circuit；Square-wave signal input connects two charge-discharge circuits respectively, described
Two-way current source circuit is parallel on power vd D, and the first square wave generation circuit and the second square wave generation circuit have been followed by switch
Circuit, two on-off circuits are connected in parallel common output trapezoidal wave signal VOUT.
Specifically, the charge-discharge circuit of the first square wave generation circuit is that electric capacity C1 and NMOS tube MN1 are constituted, current source electricity
Road is made up of PMOS MP1, and MP1 is connected between the input of MN1 and power vd D；The discharge and recharge of the second square wave generation circuit
Circuit is that electric capacity C2 and NMOS tube MN2 are constituted, and current source circuit is made up of PMOS MP2, MP2 be connected to the input of MN2 and
Between power vd D；And between MN2 and VCK, it is provided with phase inverter INV1.Electric capacity C1 and C2 are connected to the input of MN1 and MN2 respectively
And earth terminal between.
Together with, input is terminated at power supply to the sources connected in parallel of MP1 and MP2, and outfan is then connected to MN1, MN2 respectively.
On-off circuit, then realized by NMOS tube MN3 and MN4.Wherein, MN3 is connected to the outfan of MP2, and MN4 is then connected to MP1
Outfan.MN4 is further connected with electric capacity.
Generally, in 1.1V or so, edge time requires left in 300nS the amplitude of the trapezoidal wave used in USB PD communications
It is right.Therefore, for the special applications of USB PD communications, trapezoidal wave circuit arrangement one proposed by the invention is as shown in figure 1, node
Waveform is as shown in Fig. 2 principle is as follows：
Trapezoidal wave amplitude in due to PD agreements only has 1.1V, and the drain voltage VPW of MN3 is set to 1.1V, power supply electricity
Pressure VDD is then required more than 3V.
Square-wave input signal VCK provides the square-wave signal of certain frequency, and bias voltage VBP exports PMOS MP1/MP2
Fixed current I1 and I2.
When square wave VCK is high level, the conducting of NMOS tube MN1., in strobe, node VN1 is drop-down for the electric charge of electric capacity C1
To ground, while also MN4 is turned off.Signal VCKNs of the VCK after phase inverter INV1 be low level, MN2 shut-off.Electric capacity C2 quilts
MP2 charges, and node VN2 uniformly rises to form an oblique wave, until supply voltage VDD.When VN2 is more than the threshold value of NMOS tube MN3
After voltage Vthn, MN3 is opened.MN3 can cause VOUT to follow the rising ramp of VN2 uniformly to rise as source follower, until
VOUT is equal to and is maintained at VPW.So, the rising ramp of VOUT is just defined in the presence of VN2, the time of this oblique wave
Tn2 is determined that by NMOS tube threshold value vthn, electric current I2, electric capacity C2 the value for adjusting electric current I2 and electric capacity C2 can adjust tn2.
When square wave VCK is low level, VCKN is high level, and in strobe, node VN2 is pulled down to the electric charge of electric capacity C2
Ground, while also turn off MN3.Electric capacity C1 is charged by MP1, and node VN1 uniformly rises to form an oblique wave, until supply voltage
VDD.After threshold voltage vt hns of the VN1 more than NMOS tube MN4, MN4 is opened and pull-down current, and VOUT then declines therewith, so as to
Decline oblique wave of the formation time for tn1.Tn1 can be adjusted by the value for adjusting electric current I1 and electric capacity C1.
Scheme two is as shown in Figure 3.Essentially consist in one difference of scheme shown in Fig. 1：In scheme two, phase inverter is connected to
Between two current source circuit PMOSs in parallel, electric capacity has been changed to connect power supply by connection over the ground.
In other implementations, current source circuit can be changed to NMOS tube by PMOS.Equally, charge-discharge circuit
NMOS tube can also be changed to PMOS.
Thus, the trapezoidal wave generation circuit realized, can be using the rising produced the characteristics of rectangular wave needed for trapezoidal wave
Along, trailing edge, and the trapezoidal wave for producing is healthy and strong, edge time is relatively stable, and the physical layer communication solved in USB PD agreements is asked
Topic, is particularly suitable for USB PD control devices.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (8)
1. a kind of trapezoidal wave generation circuit for USB PD control devices, it is characterised in that the circuit includes square wave letter all the way
Number input, the first in parallel square wave generation circuit and the second square wave generation circuit, on-off circuit；Wherein, first square wave is produced
Raw circuit and the second square wave generation circuit are by charge-discharge circuit and current source circuit composition, the charge-discharge circuit and current source
Circuit connected in series is in power vd D in earth terminal；The square-wave signal input connects two charge-discharge circuits, the two-way current source respectively
Circuit in parallel is on power vd D, and the first square wave generation circuit and the second square wave generation circuit have been followed by on-off circuit, and two are opened
Powered-down road is connected in parallel common output trapezoidal wave signal VOUT.
2. the trapezoidal wave generation circuit of USB PD control devices is used for as claimed in claim 1, it is characterised in that the current source
Circuit is made up of PMOS or NMOS tube, and in together, input is terminated at power supply to the sources connected in parallel of PMOS or NMOS tube, exports
End is then connected to charge-discharge circuit.
3. the trapezoidal wave generation circuit of USB PD control devices is used for as claimed in claim 1, it is characterised in that the discharge and recharge
Circuit is that electric capacity and metal-oxide-semiconductor are constituted, and wherein, the source electrode of metal-oxide-semiconductor is connected to square-wave signal input, and electric capacity is connected to the input of metal-oxide-semiconductor
End.
4. the trapezoidal wave generation circuit of USB PD control devices is used for as claimed in claim 3, it is characterised in that the electric capacity connects
Between the input and earth terminal of metal-oxide-semiconductor.
5. the trapezoidal wave generation circuit of USB PD control devices is used for as claimed in claim 3, it is characterised in that the electric capacity connects
Between the input and power vd D of metal-oxide-semiconductor.
6. the trapezoidal wave generation circuit of USB PD control devices is used for as claimed in claim 4, it is characterised in that the first party
The metal-oxide-semiconductor of the charge-discharge circuit of wave generation circuit is connected to square-wave signal input, the charge-discharge circuit of the second square wave generation circuit
The input of square-wave signal is connected to by phase inverter then.
7. the trapezoidal wave generation circuit of USB PD control devices is used for as claimed in claim 1, it is characterised in that the switch electricity
Road, is realized by NMOS tube.
8. the trapezoidal wave generation circuit of USB PD control devices is used for as claimed in claim 7, it is characterised in that the switch electricity
One of NMOS tube on road is connected to electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610826419.1A CN106533398B (en) | 2016-09-14 | 2016-09-14 | A kind of trapezoidal wave generation circuit for USB PD control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610826419.1A CN106533398B (en) | 2016-09-14 | 2016-09-14 | A kind of trapezoidal wave generation circuit for USB PD control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106533398A true CN106533398A (en) | 2017-03-22 |
| CN106533398B CN106533398B (en) | 2019-11-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610826419.1A Active CN106533398B (en) | 2016-09-14 | 2016-09-14 | A kind of trapezoidal wave generation circuit for USB PD control device |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201533292U (en) * | 2009-07-09 | 2010-07-21 | 山东艾诺仪器有限公司 | Trapezoidal wave generator controlled by integrating circuit |
| CN101789737A (en) * | 2010-02-03 | 2010-07-28 | 薛晓明 | Brshless DC motor inhibiting electromagnetic torque pulsation method and device |
| CN103595312A (en) * | 2013-10-30 | 2014-02-19 | 江苏科技大学 | Brushless direct current motor control device and method based on current source inverter |
-
2016
- 2016-09-14 CN CN201610826419.1A patent/CN106533398B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201533292U (en) * | 2009-07-09 | 2010-07-21 | 山东艾诺仪器有限公司 | Trapezoidal wave generator controlled by integrating circuit |
| CN101789737A (en) * | 2010-02-03 | 2010-07-28 | 薛晓明 | Brshless DC motor inhibiting electromagnetic torque pulsation method and device |
| CN103595312A (en) * | 2013-10-30 | 2014-02-19 | 江苏科技大学 | Brushless direct current motor control device and method based on current source inverter |
Non-Patent Citations (1)
| Title |
|---|
| 李子昀: "基于电流型逆变***的直流电机转矩脉动抑制", 《工业控制计算机》 * |
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| CN106533398B (en) | 2019-11-08 |
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