CN113556844A - Signal generation device and power expander - Google Patents

Signal generation device and power expander Download PDF

Info

Publication number
CN113556844A
CN113556844A CN202110892298.1A CN202110892298A CN113556844A CN 113556844 A CN113556844 A CN 113556844A CN 202110892298 A CN202110892298 A CN 202110892298A CN 113556844 A CN113556844 A CN 113556844A
Authority
CN
China
Prior art keywords
time
driving
local
output end
switch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202110892298.1A
Other languages
Chinese (zh)
Other versions
CN113556844B (en
Inventor
不公告发明人
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chengdu Century Photosynthesis Technology Co ltd
Original Assignee
Chengdu Century Photosynthesis Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chengdu Century Photosynthesis Technology Co ltd filed Critical Chengdu Century Photosynthesis Technology Co ltd
Publication of CN113556844A publication Critical patent/CN113556844A/en
Application granted granted Critical
Publication of CN113556844B publication Critical patent/CN113556844B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

The invention provides a signal generating device and a power expander, wherein the signal generating device is arranged between a photoelectric coupler and a local drive switch and is used for acquiring the working time of the output end of the photoelectric coupler; compensating the working time according to preset compensation time, and determining the driving time for driving the local driving switch, wherein the compensation time is the time predetermined according to intrinsic parameters of the photoelectric coupler and the local driving switch; and generating a first driving signal with driving time to drive the local driving switch to work. According to the signal generating device and the power expander provided by the embodiment of the invention, the local drive switch and the front-stage drive switch have the same conduction time, so that when the power expander is used for expansion, the front-stage controlled object and the rear-stage controlled object have the same on-off time, and the running states of the front-stage controlled object and the rear-stage controlled object are the same.

Description

Signal generation device and power expander
Technical Field
The invention relates to the technical field of control equipment, in particular to a signal generating device and a power expander.
Background
In the home and business application scenes, the LED (light emitting diode) lamp strip has been widely used as a common atmosphere lighting fixture, and as the consumption level of people increases, consumers have new requirements for brightness and color adjustment, arbitrary extension and the like.
The current LED control driver cannot achieve any length due to power limitation, and some general LED power expanders exist in the market and can achieve the extension function, but after multi-stage extension and amplification, the extended lamp strip and the lamp strip before extension have obvious brightness and color difference (the color difference only aims at the color lamp strip), and the LED control driver is particularly obvious under low brightness.
Disclosure of Invention
To solve the above problems, embodiments of the present invention provide a signal generating apparatus and a power expander.
In a first aspect, an embodiment of the present invention provides a signal generating apparatus, which is applied to a power expander, an input end of the signal generating apparatus is configured to be connected to an output end of a photocoupler of the power expander, and a first output end of the signal generating apparatus is configured to transmit a first driving signal to a local driving switch of the power expander;
the signal generating means is for:
collecting the working time of the output end of the photoelectric coupler;
compensating the working time according to preset compensation time, and determining the driving time for driving the local driving switch, wherein the compensation time is predetermined time according to intrinsic parameters of the photoelectric coupler and the local driving switch;
and generating a first driving signal with the driving time, and driving the local driving switch to work so that the conduction time of the local driving switch is consistent with the conduction time of a previous stage driving switch before the power expander.
In one possible implementation, the compensation time includes a first delay time determined according to an intrinsic parameter of the photocoupler and a second delay time determined according to an intrinsic parameter of the local driving switch;
the first delay time is the difference value between the working time of the output end of the photoelectric coupler and the conduction time of the front-stage driving switch; the second delay time is a difference between the on time of the local driving switch and the driving time.
In one possible implementation, the intrinsic parameters of the photocoupler include: rise time Tr of the photocouplerU1Fall time TfU1Delay rise time TLHU1And a delayed fall time THLU1；
If the working time of the output end of the photoelectric coupler is the time between the starting time point of the falling edge and the ending time point of the rising edge, the first delay time Td1 is:
Td1＝TLHU1+a×TrU1-THLU1+b×TfU1；
if the working time of the output end of the photoelectric coupler is the time between the ending time point of the falling edge and the starting time point of the rising edge, the first delay time Td1 is:
Td1＝TLHU1-(1-a)×TrU1-THLU1-(1-b)×TfU1；
wherein, a is the proportion of the time of non-conduction in the falling edge of the output end of the photoelectric coupler, and b is the proportion of the time of non-conduction in the rising edge of the output end of the photoelectric coupler.
In one possible implementation, the intrinsic parameters of the local drive switch include: a rise time Tr of a drive voltage of the local drive switchQ0VFall time TfQ0VAnd a rise time Tr of a drive current of the local drive switchQ0IFall time TfQ0I；
The second delay time Td2 is:
Td2＝(1-c)×TfQ0V+(1-d)×TfQ0I-m×TrQ0V-n×TrQ0I；
wherein c is a proportion of the time of non-conduction in a falling edge of the driving voltage of the local driving switch, d is a proportion of the time of non-conduction in a falling edge of the driving current of the local driving switch, m is a proportion of the time of non-conduction in a rising edge of the driving voltage of the local driving switch, and n is a proportion of the time of non-conduction in a rising edge of the driving current of the local driving switch.
In one possible implementation, the driving time Tout for driving the local driving switch is:
Tout＝Twork-Td1-Td2；
wherein Twork is the collected working time of the output end of the photoelectric coupler, Td1 is the first delay time, and Td2 is the second delay time.
In one possible implementation, the output of the optoelectronic coupler is the output on the high-level side.
In a possible implementation manner, the signal generating device further includes a second output terminal;
the second output end is used for transmitting a second driving signal irrelevant to the working time to a local driving switch of the power expander, and the first output end and the second output end do not work simultaneously.
In a possible implementation manner, in a case where the first output terminal outputs the first driving signal, the second output terminal is in a high impedance state;
and under the condition that the second output end outputs the second driving signal, the first output end is in a high-impedance state.
In a second aspect, an embodiment of the present invention further provides a power expander, including: an opto-coupler, a local drive switch and a signal generating device as described above.
In a possible implementation, in case the power spreader comprises the signal generating device of claim 7 or 8,
the first output end of the signal generating device is connected with a local driving switch of the power expander, the front stage and the rear stage of the power expander are respectively used for accessing a controlled object, and the second output end of the signal generating device does not work;
or the second output end of the signal generating device is connected with a local driving switch of the power expander, the rear stage of the power expander is used for accessing a controlled object, and the first output end of the signal generating device does not work.
In the foregoing aspect of the embodiments of the present invention, a signal generating device is disposed between a photocoupler of a power expander and a local driving switch, where the signal generating device is preset with a compensation time determined based on intrinsic parameters of the photocoupler and the local driving switch, and compensates for a collected working time of an output end of the photocoupler, so as to generate a driving time, so that when a first driving signal with the driving time drives the local driving switch, the local driving switch and a preceding stage driving switch have a consistent on-time, and when the local driving switch is expanded based on the power expander, controlled objects in front and rear stages have a same on-off time, so that operating states of the controlled objects in front and rear stages are consistent.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 illustrates a schematic diagram of a conventional power spreading architecture;
fig. 2 shows an operation timing diagram of a conventional power expander;
fig. 3 is a schematic diagram illustrating a structure of a power expander according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of the output driving signal of the signal generating device according to the embodiment of the present invention;
fig. 5 shows an operation timing diagram of a power expander provided by an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating another structure of a power expander according to an embodiment of the present invention;
fig. 7 is a schematic diagram illustrating an application scenario of the power expander according to the embodiment of the present invention.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The structure of the current power expander can be seen in fig. 1, and the dashed line box in fig. 1 shows the composition of a conventional power expander, which mainly comprises a photocoupler U1, an inverter U2 and a driving switch Q2, and the working principle of the power expander is as follows:
the power expander (or the control driver) at the front stage outputs PWM signals (the frequency is generally 1 KHz-4 KHz), and drives the driving switch Q1 at the front stage to be switched on and off, so that the high-frequency switching-on and switching-off of the lamp strips D1-D10 at the front stage are realized, and the purpose of adjusting the macroscopic brightness of the lamp strips D1-D10 can be achieved by adjusting the duty ratio of the PWM signals; the multi-path synchronous use can realize color mixing to achieve the purpose of adjusting color. The photoelectric coupler U1 is used for isolating the drive signal from the power circuit, so that the preceding power supply V1+ and a post-stage power supply V2+ may not be the same; for example, the front stage power supply V1+ 24V, rear power supply V2+ 48V, or, a preceding power supply V1+ and a post-stage power supply V2+ are both 24V, except that they are powered by different voltage sources. The inverter U2's effect is the promotion that realizes the driving force, can the direct drive rear drive switch Q2 break-make after the reversal to the lamp area D11-D20 high frequency break-make of control rear stage. Wherein, the driving switches Q1 and Q2 can be field effect transistors. DC-DC is a DC voltage converter for converting an external power source (e.g., power source V)2(+) into the operating voltage V of the power expander3+。
Aiming at the problem that the traditional power expander has brightness difference after multi-stage extension, the inventor finds that the brightness difference is caused by the inherent delay characteristics of components (such as U1, U2, Q2 and the like) in the power expander. Specifically, a timing diagram of the operation of the power expander can be seen in fig. 2.
A PWM signal is input to the gate of the pre-drive switch Q1, and the gate-source voltage Vgs of the pre-drive switch Q1 is set at the rising edge of the PWM signal in one cycle of the PWM signalQ1Gradually increase and rise to the Miller platformVoltage VthQ1Time (i.e. at time point t)1) The pre-driver Q1 starts to turn on, and the drain current Id of Q1 is turned onQ1And gradually increases. When the drain current IdQ1Above a certain threshold value (i.e. at point in time t)2) The front light strip D1-D10 starts to emit light and the photocoupler U1 starts to operate, and after a while, the input voltage Vi of the inverter U2 is made to be the sameU2(this voltage is also the output voltage Vo of the photocoupler U1U1) Starts to fall (at time t)4) Then at the input voltage ViU2Above a certain threshold, inverter U2 begins to operate (i.e., at time t)5). After a further delay, the output voltage Vo of inverter U2U2Starts to rise (i.e. at a point of time t)7). The output voltage Vo of the inverter U2U2Gate-source voltage Vgs equivalent to that of the subsequent-stage drive switch Q2Q2When the voltage Vo is higher than the reference voltageU2When the voltage is greater than a certain value, the rear driving switch Q2 is turned on (i.e. at the time point t)8) Drain current Id of the subsequent-stage drive switch Q2Q2Gradually increase when the drain current IdQ2Above a certain threshold value (i.e. at point in time t)10) The light strip D11-D20 of the rear stage starts to emit light in an on state. At the falling edge of the PWM signal, the process is similar to that described above and will not be described in detail here.
It can be found by analysis that the front-stage driving switch Q1 has a rise time Tr during the whole circuit operationQ1(i.e. t)1And t3Time period in between), fall time TfQ1(ii) a The photoelectric coupler U1 has a falling delay time THLU1(i.e. t)2And t5Time period in between), fall time TfU1(i.e. t)4And t6Time period in between), a rise delay time TLHU1Rising time TrU1(ii) a Inverter U2 also has a rise delay time TLHU2(i.e. t)5And t8Time period in between), rise time TrU2(i.e. t)7And t9Time period in between), the fall delay time THLU2Fall time TfU2(ii) a The rear stage drive switch Q2 has a rise time TrQ2Fall time TfQ2And the like. Since the time required for the rising process and the falling process of each device are different (for example, the rising time Tr of the front-stage drive switch Q1)Q1And fall time TfQ1Different), the on-time T1 of the front-stage driving switch Q1 is different from the on-time T2 of the rear-stage driving switch Q2, so that the duty ratios of the front-stage and rear-stage PWM signals are different, and the brightness of the front-stage and rear-stage light strips is different. In general, in a single period, the on time T2 of the rear stage Q2 is longer than the on time T1 of the front stage Q1, that is, the duty ratio becomes large and the luminance becomes high. When the whole loop is expanded in multiple stages, the change amplitude is larger, and the whole brightness and color are inconsistent.
To solve the problem, the embodiment of the present invention provides a signal generating apparatus, which is applied to a power expander, and by actively controlling the duty ratio of the local driving switch Q0, the duty ratios of the front-stage driving switch and the rear-stage driving switch (i.e., the front-stage driving switch Q1 and the local driving switch Q0) are made to be consistent, so that the brightness of the multi-stage expanded light strip can still be kept consistent. Fig. 3 is a schematic diagram showing a configuration in which the signal generating apparatus is applied to a power expander, and a dotted frame in fig. 3
As shown in fig. 3, the input terminal of the signal generating device U0 is configured to be connected to the output terminal of the optocoupler U1 of the power expander, and the first output terminal of the signal generating device U0 is configured to transmit the first driving signal to the local driving switch Q0 of the power expander. As shown in fig. 4, the signal generating device U0 is specifically configured to perform the following steps:
step 401: and collecting the working time of the output end of the photoelectric coupler U1.
In the embodiment of the present invention, the operating time of the output end of the photocoupler U1 refers to a time period during which the output end of the photocoupler U1 can output an effective voltage, and the effective voltage is a voltage output by the photocoupler U1 in response to a high level output from a side of a previous-stage controlled object (e.g., the previous-stage light strip D1-D10). Specifically, when the output end of the photocoupler U1 outputs the effective voltage, it can be collected by the input end of the signal generating device U0, so that the signal generating device U0 can determine the operating time of the output end of the photocoupler U1.
Step 402: the operating time is compensated according to a preset compensation time, which is a time predetermined according to intrinsic parameters of the photocoupler U1 and the local drive switch Q0, and the driving time for driving the local drive switch Q0 is determined.
Step 403: the first driving signal with the driving time is generated to drive the local driving switch Q0 to work, so that the conducting time of the local driving switch Q0 is consistent with the conducting time of the previous driving switch Q1 before the power expander.
As described above in connection with fig. 1 and fig. 2, in the conventional power expander, intrinsic parameters (such as rise time, fall time, etc.) of the photocoupler U1, the inverter U2, the rear stage driving switch Q2, etc. may cause different conduction times of the front and rear stages; in the embodiment of the present invention, the intrinsic parameters of the photocoupler U1 and the rear driving switch Q2 still affect the on-time of the front and rear stages, but the intrinsic parameters are fixed, so in the embodiment, the compensation time is preset, and the working time is compensated based on the compensation time, so that the compensated driving time can make the on-time of the local driving switch Q0 coincide with the on-time of the previous front driving switch Q1 when the local driving switch Q0 is driven. Specifically, the signal generating device U0 generates a driving signal with the driving time, i.e., a first driving signal, and drives the local driving switch Q0 to operate with the first driving signal, so that the local driving switch Q0 and the previous driving switch Q1 have the same on-time, i.e., are driven by PWM signals with the same duty ratio. For example, the local driving switch Q0 may be a fet, and the first driving signal is connected to a gate of the fet to control on/off of the fet.
It should be noted that, in the embodiment of the present invention, the driving switches Q0, Q1 and the like all adopt a PWM control method, that is, the first driving signal is a PWM signal, and the "operating time", "driving time", "on time of the preceding driving switch Q1" and the like are all time within one cycle. The local driving switch Q0 is substantially the same as the previous subsequent driving switch Q2, and is a driving switch in the current power expander, and the driving switch is named differently, only for convenience of distinguishing the power expander provided in this embodiment from the conventional power expander.
The signal generating device provided by the embodiment of the invention is arranged between a photocoupler U1 and a local drive switch Q0 of a power expander, is preset with compensation time determined based on intrinsic parameters of the photocoupler U1 and the local drive switch Q0, compensates the collected working time of the output end of the photocoupler U1, generates drive time, enables the local drive switch Q0 and a front stage drive switch Q1 to have consistent conduction time when a first drive signal with the drive time drives the local drive switch Q0, enables controlled objects of front and rear stages to have the same conduction time when the power expander is used for expansion, and enables the running states of the controlled objects of the front and rear stages to be consistent. For example, the light strips of the front and rear stages have the same brightness, etc.
On the basis of the above embodiment, the compensation time includes a first delay time determined according to the intrinsic parameter of the photocoupler U1 and a second delay time determined according to the intrinsic parameter of the local drive switch Q0; the first delay time is the difference between the working time of the output end of the photoelectric coupler U1 and the conduction time of the front-stage drive switch Q1; the second delay time is the difference between the on time of the local drive switch Q0 and the drive time.
In the embodiment of the invention, when the collected working time is compensated, the delay time caused by the photoelectric coupler U1, namely the first delay time, needs to be compensated; when the local driving switch Q0 is driven by the first driving signal generated by the signal generating device U0, the actual on time of the local driving switch Q0 is different from the driving time of the first driving signal, and the difference is characterized by the second delay time in this embodiment. The present embodiment comprehensively determines the compensation time by the first delay time and the second delay time, so that the local driving switch Q0 driven by the first driving signal has the same on-time as the previous driving switch Q1.
Specifically, the first delay time is a difference between the operating time of the output terminal of the photocoupler U1 and the on time of the previous stage driving switch Q1 (i.e., previous stage on time), and the second delay time is a difference between the on time of the local driving switch Q0 (i.e., next stage on time) and the driving time; that is, the first delay time Td1 is the operating time Twork — the previous stage conducting time T1, and the second delay time Td2 is the subsequent stage conducting time T2 — the driving time Tout. By adding the above two expressions, Td1+ Td2 is Twork-T1+ T2-Tout; if the front stage on-time T1 is the same as the rear stage on-time T2, Td1+ Td2 is Twork-Tout, so the driving time Tout is the collected working time Twork-Td1-Td 2; the compensation time is Td1+ Td 2.
In the embodiment of the present invention, the signal generating device U0 is disposed between the photocoupler U1 and the local driving switch Q0 of the power expander, so that the compensation time can be determined based on the intrinsic parameters of the photocoupler U1 and the local driving switch Q0, and the compensation time is independent of the previous driving switch Q1, that is, the power expander can compensate the voltage output by the previous driving switch Q1 (i.e., the voltage collected by the input terminal of the photocoupler U1) relatively well without knowing the intrinsic parameters of the previous driving switch Q1, and make the two driving switches Q0 and Q1 have the same conduction time.
The signal generation device U0 provided by the embodiment of the invention can determine the driving time only after the working time is acquired, so the signal generation device U0 can normally output the first driving signal only after a period of about one cycle; however, since the first driving signal is a PWM signal, the delay of about one cycle does not affect the operating states of the front and rear controlled objects, such as the brightness of the front light strip D1-D10 and the rear light strip D11-D20. Moreover, the time of one period is generally small and is in the millisecond level, and the user cannot feel the difference between the front level and the rear level. For example, if the frequency of the driving signal is 1kHz, the period thereof is 1 ms.
The operation of the power expander shown in fig. 3 will be described in detail with reference to the timing diagram shown in fig. 5.
In the embodiment of the invention, the photoelectricity of the power expanderThe coupler U1 has the same working principle as the photocoupler of the conventional power expander, and reference may be made to the description related to fig. 1 and 2, which is not repeated herein. In the embodiment of the invention, the intrinsic parameters of the photoelectric coupler U1 comprise: rise time Tr of photocoupler U1U1Fall time TfU1Delay rise time TLHU1And a delayed fall time THLU1. Wherein the delayed fall time THL is shown in FIG. 5U1The switch Q1 begins to conduct for the preceding stage (i.e., time t)2) The voltage at the output of the optocoupler U1 drops to a certain threshold (i.e. time t)5) Time of (1), fall time TfU1The elapsed time of the falling edge of the output terminal of the photocoupler U1 (i.e. the time point t)4To t6Time in between), delay rise time TLHU1The switch Q1 is driven to stop conducting for the front stage (i.e. time point t)7) The voltage at the output of the optocoupler U1 rises to a certain threshold (i.e. time t)9) Time of rise time TrU1The elapsed time for the rising edge of the output terminal of the photocoupler U1 (i.e., the time point t8To t10The time in between).
In the embodiment of the invention, the input end of the signal acquisition device U0 acquires the voltage of the output end of the photoelectric coupler U1, and the voltage Vi of the input end of the signal acquisition device U0U0And the output end voltage Vo of the photoelectric coupler U1U1The same; since the working time of the output terminal of the photocoupler U1 is the time collected by the signal generating device U0, the collection is performed in different manners, and different working times may be collected. For example, the working time Twork of the output terminal of the photocoupler U1 may be the starting time point of the falling edge of the output terminal of the photocoupler U1 (i.e., the time point t)4) And the end time point of the rising edge (i.e. time point t)10) The working time Twork may also be the ending time point of the falling edge of the output end of the photocoupler U1 (i.e. the time point t)6) And the starting time point of the rising edge (i.e. time point t)8) The time in between. FIG. 5 shows the working time Twork as the time point t4To a time point t10The time between isIllustrating the process. After the working time Twork is acquired, the first delay time can be determined.
Specifically, if the working time Twork is the time point t4To a time point t10The time between, as shown in FIG. 5, the front stage on time T1 minus TLHU1Plus the time that U1 is not conducting on its falling edge (i.e., time t)4To t5Time) of the working time, the starting point of the working time (i.e. the time point t) can be obtained4) To a point of time t7The time between; and, in addition, THLU1And the time of non-conduction in the rising edge of U1 (i.e., time t)9To t10Time) to obtain the working time Twork. I.e., T1-THLU1+b×TfU1+TLHU1+a×TrU1Thus, the first delay time Td 1-T1-TLHU1+a×TrU1-THLU1+b×TfU1。
Where a is the proportion of the time for which the output terminal of the photocoupler U1 is not turned on in the falling edge, and b is the proportion of the time for which the output terminal of the photocoupler U1 is not turned on in the rising edge. Thus, b × TfU1I.e. the time point t4To t5Time of (a) x TrU1I.e. the time point t9To t10Time of (d).
Correspondingly, if the working time of the output end of the photocoupler U1 is the time between the end time point of the falling edge and the start time point of the rising edge, that is, the working time Twork is the time point t6To a time point t8The time between, as can be seen: T1-THLU1-(1-b)×TfU1+TLHU1-(1-a)×TrU1Ttwork, Td1 is TLHU1-(1-a)×TrU1-THLU1-(1-b)×TfU1. Wherein (1-b). times.TfU1I.e. the time point t5To t6Time (1-a). times.TrU1I.e. the time point t8To t9Time of (d).
In the embodiment of the invention, the first driving signal output by the signal generating device U0 is used for driving the local driving switch Q0 to be switched on and off, and the voltage Vo output by the signal generating device U0U0I.e., the gate-source voltage Vgs of the local drive switch Q0Q0. At a point in time t11The first drive signal begins to drive the local drive switch Q0; when the first drive signal ends driving, i.e. at the point of time t16Q0 is stopped from being driven, and the corresponding gate-source voltage VgsQ0Gradually decreases. In this embodiment, the driving time Tout of the first driving signal is the time point (i.e. time point t) for starting driving11) To the point of time when the driving is ended (i.e., the point of time t)16)。
Moreover, the working principle of the local driving switch Q0 is similar to that of the previous driving switch Q1, and the working process of the local driving switch Q0 is not described herein. In the embodiment of the present invention, the intrinsic parameters of the local driving switch Q0 include: rise time Tr of drive voltage (e.g., gate-source voltage) of local drive switch Q0Q0V(i.e., time t)11To t13Time of (d), fall time TfQ0V(i.e., time t)16To t18Time) and the rise time Tr of the drive current (e.g., source current) of the local drive switch Q0Q0I(i.e., time t)12To t15Time of (d), fall time TfQ0I(i.e., time t)17To t20Time of (d).
In the embodiment of the present invention, let c be the proportion of the time of non-conduction in the falling edge of the driving voltage of the local driving switch Q0, d be the proportion of the time of non-conduction in the falling edge of the driving current of the local driving switch Q0, m be the proportion of the time of non-conduction in the rising edge of the driving voltage of the local driving switch Q0, and n be the proportion of the time of non-conduction in the rising edge of the driving current of the local driving switch Q0. The drive time Tout minus the rise time Tr as shown in fig. 5Q0VThe off time of (1), minus the rise time TrQ0IThe non-conducting time of (1) is the time point (t) when the local driving switch Q0 begins to conduct14) To the end of the drive (i.e. at time t)16) The time of (d); followed by a fall time TfQ0VMiddle on-time and middle fall-time TfQ0IThe on-time of the local drive switch Q0, i.e., the next stage on-time T2, is recorded.
Thus, Tout-m × TrQ0V-n×TrQ0I+(1-c)×TfQ0V+(1-d)×TfQ0IT2, the second delay time Td2 is T2-Tout is (1-c) × TfQ0V+(1-d)×TfQ0I-m×TrQ0V-n×TrQ0I。
The coefficients a, b, c, d, m and n are all numbers between 0 and 1, and the data is determined based on the actual performance of the device. Typically, the above factor is equal to about 0.5.
In the embodiment of the present invention, the compensation time (i.e., the first delay time and the second delay time) is preset, and after the working time Twork is collected, the corresponding driving time Tout can be determined to be Twork-Td1-Td2, and when the signal generation device U0 drives the local driving switch Q0 with the driving time Tout, the local driving switch Q0 and the previous driving switch Q1 can be ensured to have the same on-time.
Further alternatively, as shown in fig. 3, the output terminal of the photocoupler U1 is an output terminal on the high side. That is, the input end of the signal generating device U0 is connected to the high side of the photocoupler U1, and the digital high-low level characteristics (for example, high at 0.6Vcc or more and low at 0.2Vcc or less) of the microprocessor MCU in the signal generating device U0 accelerate the acquisition rate, reduce the delay (delay inconsistency between different brightnesses) influence caused by the rising edge and the falling edge of the photocoupler U1, and at the same time, under the condition that the CTR (current transfer ratio) is fixed, a small photocoupler input current can be used, the performance attenuation of the photocoupler U1 is slowed down, the life of the power expander is prolonged, and the anti-interference capability of the power expander is improved.
Further optionally, referring to fig. 6, the signal generating device U0 further includes a second output terminal 2; the second output terminal 2 is used to transmit a second driving signal independent of the operation time to the local driving switch Q0 of the power expander.
In the embodiment of the present invention, the first output terminal 1 of the signal generating device U0 is configured to output the first driving signal based on the working time, so that the local driving switch Q0 can have the same on-time as the previous driving switch Q1; the signal generator U0 is further provided with a second output 2 capable of autonomously generating a second driving signal, i.e. the second driving signal is independent of the operating time, or the second driving signal can be output even if the operating time of U1 is not acquired. In order to avoid that two output terminals simultaneously send driving signals to the local driving switch Q0, the first output terminal 1 and the second output terminal 2 in this embodiment do not operate simultaneously.
Optionally, in a case where the first output terminal 1 outputs the first driving signal, the second output terminal 2 is in a high impedance state; in the case that the second output terminal 2 outputs the second driving signal, the first output terminal 1 is in a high impedance state. In the embodiment of the invention, when one output end of the signal generating device U0 works, the other end is set to be in a high impedance state, so that the influence on the other output end when one output end outputs a driving signal can be avoided, and the source of the driving signal of the power expander is convenient to switch.
Based on the same inventive concept, an embodiment of the present invention further provides a power expander, as shown in fig. 3 or fig. 6, including: a photocoupler U1, a local drive switch Q0 and a signal generating device U0 as provided in any of the above embodiments.
Further alternatively, if the signal generating device U0 includes the second output terminal 2, the power expander can be used in the scenario required by the conventional power expander, and the power expander can also be regarded as a control driver, i.e. the power expander does not have the controlled object of the previous stage. Specifically, as shown in fig. 7, the power expander 100 at the front stage serves as a control driver to drive the front stage light strips D1-D10, and then the power expander 200 at the rear stage is connected to drive the rear stage light strips D11-D20.
Specifically, if the power expander is used as a control driver, i.e. for the power expander 100 in the previous stage, the second output terminal 2 of the signal generating device U0 is connected to the driving switch Q1 of the power expander 100, and outputs a second driving signal (also a PWM signal) to the driving switch Q1; the rear stage of the power expander 100 is used for accessing controlled objects D1-D10; at this time, the first output terminal 1 of the signal generating device U0 does not operate, i.e., does not generate the first driving signal.
If the power expander is used as a conventional power expander, that is, for the power expander 200 at the rear stage, the first output terminal 1 of the signal generating device U0 is connected to the driving switch Q0 of the power expander 200, and the front stage and the rear stage of the power expander 200 are respectively used for accessing controlled objects, that is, the light strips D1-D10 and the light strips D11-D20; also, the second output terminal 2 of the signal generating device U0 is not operated, i.e., does not output the second driving signal.
The power expander provided by the embodiment of the invention can be applied to different scenes by controlling different output ends to output the driving signals, namely, the power expander not only has an expanding function, but also can be used as a driving controller with a driving function.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and the present invention shall be covered by the claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (10)

1. A signal generating device is applied to a power expander and is characterized in that an input end of the signal generating device is used for being connected with an output end of a photoelectric coupler of the power expander, and a first output end of the signal generating device is used for transmitting a first driving signal to a local driving switch of the power expander;
the signal generating means is for:
collecting the working time of the output end of the photoelectric coupler;
compensating the working time according to preset compensation time, and determining the driving time for driving the local driving switch, wherein the compensation time is predetermined time according to intrinsic parameters of the photoelectric coupler and the local driving switch;
and generating a first driving signal with the driving time, and driving the local driving switch to work so that the conduction time of the local driving switch is consistent with the conduction time of a previous stage driving switch before the power expander.
2. Signal generation device according to claim 1,
the compensation time comprises a first delay time determined according to intrinsic parameters of the photoelectric coupler and a second delay time determined according to intrinsic parameters of the local drive switch;
the first delay time is the difference value between the working time of the output end of the photoelectric coupler and the conduction time of the front-stage driving switch; the second delay time is a difference between the on time of the local driving switch and the driving time.
3. The signal generating apparatus of claim 2, wherein the intrinsic parameters of the photocoupler include: rise time Tr of the photocouplerU1Fall time TfU1Delay rise time TLHU1And a delayed fall time THLU1；
If the working time of the output end of the photoelectric coupler is the time between the starting time point of the falling edge and the ending time point of the rising edge, the first delay time Td1 is:
Td1＝TLHU1+a×TrU1-THLU1+b×TfU1；
if the working time of the output end of the photoelectric coupler is the time between the ending time point of the falling edge and the starting time point of the rising edge, the first delay time Td1 is:
Td1＝TLHU1-(1-a)×TrU1-THLU1-(1-b)×TfU1；
wherein, a is the proportion of the time of non-conduction in the falling edge of the output end of the photoelectric coupler, and b is the proportion of the time of non-conduction in the rising edge of the output end of the photoelectric coupler.
4. Signal generation device according to claim 2,
the intrinsic parameters of the local drive switch include: a rise time Tr of a drive voltage of the local drive switchQ0VFall time TfQ0VAnd a rise time Tr of a drive current of the local drive switchQ0IFall time TfQ0I；
The second delay time Td2 is:
Td2＝(1-c)×TfQ0V+(1-d)×TfQ0I-m×TrQ0V-n×TrQ0I；
wherein c is a proportion of the time of non-conduction in a falling edge of the driving voltage of the local driving switch, d is a proportion of the time of non-conduction in a falling edge of the driving current of the local driving switch, m is a proportion of the time of non-conduction in a rising edge of the driving voltage of the local driving switch, and n is a proportion of the time of non-conduction in a rising edge of the driving current of the local driving switch.
5. The signal generating apparatus of claim 2, wherein a driving time Tout for driving the local driving switch is:
Tout＝Twork-Td1-Td2；
wherein Twork is the collected working time of the output end of the photoelectric coupler, Td1 is the first delay time, and Td2 is the second delay time.
6. The signal generating apparatus according to claim 1, wherein the output terminal of the photocoupler is an output terminal on a high side.
7. The signal generating device according to any one of claims 1 to 6, characterized in that the signal generating device further comprises a second output;
the second output end is used for transmitting a second driving signal irrelevant to the working time to a local driving switch of the power expander, and the first output end and the second output end do not work simultaneously.
8. The signal generating apparatus of claim 6,
under the condition that the first output end outputs the first driving signal, the second output end is in a high-impedance state;
and under the condition that the second output end outputs the second driving signal, the first output end is in a high-impedance state.
9. A power expander, comprising: an opto-coupler, a local drive switch and a signal generating device as claimed in any one of claims 1 to 8.
10. The power expander according to claim 9, wherein, in the case where the power expander comprises the signal generating apparatus according to claim 7 or 8,
the first output end of the signal generating device is connected with a local driving switch of the power expander, the front stage and the rear stage of the power expander are respectively used for accessing a controlled object, and the second output end of the signal generating device does not work;
or the second output end of the signal generating device is connected with a local driving switch of the power expander, the rear stage of the power expander is used for accessing a controlled object, and the first output end of the signal generating device does not work.
CN202110892298.1A 2021-06-25 2021-08-04 Signal generating device and power expander Active CN113556844B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202110712766 2021-06-25
CN2021107127662 2021-06-25

Publications (2)

Publication Number Publication Date
CN113556844A true CN113556844A (en) 2021-10-26
CN113556844B CN113556844B (en) 2023-09-22

Family

ID=78105630

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110892298.1A Active CN113556844B (en) 2021-06-25 2021-08-04 Signal generating device and power expander

Country Status (1)

Country Link
CN (1) CN113556844B (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5498977A (en) * 1995-03-03 1996-03-12 Hewlett-Packard Company Output driver having process, voltage and temperature compensation for delay and risetime
JPH104673A (en) * 1996-06-13 1998-01-06 Mitsubishi Electric Corp Power converter
CN101505558A (en) * 2008-02-04 2009-08-12 通嘉科技股份有限公司 Light emission element driving circuit having compensation mechanism
JP2010016937A (en) * 2008-07-02 2010-01-21 Yaskawa Electric Corp Power conversion device and dead time compensation method
US20120201019A1 (en) * 2011-02-07 2012-08-09 Chung Jinhwa Led emitting device and driving method thereof
JP2012169147A (en) * 2011-02-14 2012-09-06 Mitsubishi Electric Corp Lighting device and luminaire
CN104868722A (en) * 2014-02-26 2015-08-26 英飞凌科技奥地利有限公司 Power Conversion With Delay Compensation
US20200067553A1 (en) * 2018-07-25 2020-02-27 Kabushiki Kaisha Toshiba Asynchronous communication device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5498977A (en) * 1995-03-03 1996-03-12 Hewlett-Packard Company Output driver having process, voltage and temperature compensation for delay and risetime
JPH104673A (en) * 1996-06-13 1998-01-06 Mitsubishi Electric Corp Power converter
CN101505558A (en) * 2008-02-04 2009-08-12 通嘉科技股份有限公司 Light emission element driving circuit having compensation mechanism
JP2010016937A (en) * 2008-07-02 2010-01-21 Yaskawa Electric Corp Power conversion device and dead time compensation method
US20120201019A1 (en) * 2011-02-07 2012-08-09 Chung Jinhwa Led emitting device and driving method thereof
JP2012169147A (en) * 2011-02-14 2012-09-06 Mitsubishi Electric Corp Lighting device and luminaire
CN104868722A (en) * 2014-02-26 2015-08-26 英飞凌科技奥地利有限公司 Power Conversion With Delay Compensation
US20200067553A1 (en) * 2018-07-25 2020-02-27 Kabushiki Kaisha Toshiba Asynchronous communication device

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
MING-SHIAN LIN等: "An LED Driver With Pulse Current Driving Technique", 《 IEEE TRANSACTIONS ON POWER ELECTRONICS》 *
余剑青: "基于LED光衰补偿的节能型路灯控制系统研究", 《中国优秀硕士学位论文全文数据库（电子期刊）-信息科技辑》 *
张树: "单级复合开关LED驱动电源拓扑及其控制技术研究", 《中国博士学位论文全文数据库（电子期刊）》 *

Also Published As

Publication number Publication date
CN113556844B (en) 2023-09-22

Similar Documents

Publication Publication Date Title
CN103428953B (en) For the system and method utilizing system controller to carry out brightness adjustment control
CN101304625B (en) Drive circuit and electronic apparatus equipped therewith
CN202353859U (en) Controllable silicon light regulation device and illuminating system
US20120112657A1 (en) Low cost power supply circuit and method
CN101588664A (en) Light emitting diode drive circuit and circuit for controlling power switch
CN101179879A (en) Luminous device and driving circuit
CN103957648B (en) Controllable silicon, simulation, PWM light modulation universal circuit and LED drive chip
CN112821727A (en) Switching power supply system
CN201860494U (en) Light-emitting diode driving circuit with light modulating sequential control
CN102868302A (en) Gate drive circuit
CN107409460B (en) Dual control LED driver
CN113556844B (en) Signal generating device and power expander
CN102570834B (en) The control circuit switched for the interval of power converter and method
KR20140091477A (en) Switching regulator including charge pump
CN202085071U (en) Fly-back boost converter in non-isolation type
JPH07194104A (en) Synchronous rectifier
TW201810947A (en) System and method of driving power transistor
CN112153778B (en) LED lamp adjusting device for Internet of things control and LED lamp
CN115066052A (en) Control method for rectangular wave signal change of single signal line
CN113241942A (en) Bootstrap driving circuit applied to four-switch buck-boost converter
CN113382505A (en) Navigation aid lamp driving control device based on broadband power line carrier communication
US8988051B2 (en) Synchronous rectifying buck-boost converter
CN108307566B (en) LED optical communication power supply driving system
CN111176152A (en) Optical coupling switching input signal source circuit
CN104935165A (en) Power supply device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant