CN219834431U - PWM dimming signal transmission compensation circuit - Google Patents
PWM dimming signal transmission compensation circuit Download PDFInfo
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- CN219834431U CN219834431U CN202320372828.4U CN202320372828U CN219834431U CN 219834431 U CN219834431 U CN 219834431U CN 202320372828 U CN202320372828 U CN 202320372828U CN 219834431 U CN219834431 U CN 219834431U
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- 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
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- 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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model discloses a PWM dimming signal transmission compensation circuit, which comprises a photoelectric coupler, an input module, a first output module and a second output module, wherein the first output module comprises a first switching tube, a second switching tube and a first current limiting resistor; the anode of a diode of the photoelectric coupler is connected with the first power supply end, the cathode of the diode is connected with the output end of the input module, the collector of the triode is connected with the second power supply end, the emitter of the triode is grounded, and the input end of the input module is connected with the signal input end; the grid electrode of the first switch tube is connected with the second power supply end through the first current limiting resistor, the drain electrode of the first switch tube is connected with the signal output end, and the source electrode of the first switch tube is grounded; the grid electrode of the second switching tube is connected with the emitter electrode of the triode of the photoelectric coupler, the drain electrode of the second switching tube is connected with the grid electrode of the first switching tube, and the source electrode of the second switching tube is grounded; the input end of the second output module is connected with the second power supply end, and the output end of the second output module is connected with the drain electrode of the first switching tube. The PWM dimming signal transmission compensation circuit provided by the utility model can reduce the waveform distortion degree of an output signal.
Description
Technical Field
The utility model relates to the technical field of signal compensation, in particular to a PWM dimming signal transmission compensation circuit.
Background
The optical coupler transmission circuit is mainly used for transmitting signals of two parts of circuits needing to be isolated through the optical coupler. In the prior art, the PWM dimming signal transmission circuit is mainly designed based on an optocoupler transmission circuit, as shown in fig. 2, when the PWM dimming signal transmission circuit is put into use, the secondary PWM dimming signal output after the primary PWM dimming signal is isolated and converted by the optocoupler will generate a waveform distortion phenomenon, that is, the secondary PWM dimming signal has low precision, and at this time, an engineer needs to spend additional time and effort to perform distortion compensation on the secondary PWM dimming signal, and then the secondary PWM dimming signal can be used by a post-stage circuit.
Disclosure of Invention
The utility model provides a PWM dimming signal transmission compensation circuit, which solves one or more technical problems in the prior art, and at least provides a beneficial selection or creation condition.
The utility model provides a PWM dimming signal transmission compensation circuit, which comprises a photoelectric coupler, an input module, a first output module and a second output module;
the input end of the input module is connected with the signal input end, the output end of the input module is connected with the diode cathode of the photoelectric coupler, and the diode anode of the photoelectric coupler is connected with the first power supply end; the triode collector of the photoelectric coupler is connected with the second power supply end, and the triode emitter of the photoelectric coupler is grounded;
the first output module comprises a first switching tube, a second switching tube and a first current limiting resistor, wherein the grid electrode of the first switching tube is connected with the second power supply end through the first current limiting resistor, the drain electrode of the first switching tube is connected with the signal output end, and the source electrode of the first switching tube is grounded; the grid electrode of the second switching tube is connected with the triode emitter of the photoelectric coupler, the drain electrode of the second switching tube is connected with the grid electrode of the first switching tube, and the source electrode of the second switching tube is grounded;
the input end of the second output module is connected with the second power supply end, and the output end of the second output module is connected with the drain electrode of the first switch tube.
Further, the input module comprises a third switching tube and a second current limiting resistor;
the grid electrode of the third switching tube is connected with the signal input end through the second current limiting resistor, the drain electrode of the third switching tube is connected with the diode cathode of the photoelectric coupler, and the source electrode of the third switching tube is grounded.
Further, the input module further comprises a first bleeder resistor connected in parallel between the gate and the source of the third switching tube.
Further, the second output module comprises a diode component and a third current limiting resistor, and the diode component is formed by connecting a plurality of diodes end to end in sequence;
the input end of the diode component is connected with the second power supply end through the third current limiting resistor, and the output end of the diode component is connected with the drain electrode of the first switching tube.
Further, the turn-on voltage of the diode assembly is not less than the turn-on voltage of the first switching tube.
Further, the first switching tube, the second switching tube and the third switching tube are N-channel field effect tubes.
Further, the first output module further comprises a protection resistor, and the protection resistor is connected in parallel between a triode collector and a triode emitter of the photoelectric coupler.
Further, the circuit further comprises a second bleeder resistor, and the triode emitter of the photoelectric coupler is grounded through the second bleeder resistor.
Further, the circuit further comprises a fourth current limiting resistor, and a diode anode of the photoelectric coupler is connected with the first power supply end through the fourth current limiting resistor.
Further, the circuit further comprises a fifth current limiting resistor, and a triode collector of the photoelectric coupler is connected with the second power supply end through the fifth current limiting resistor.
The utility model has at least the following beneficial effects: the primary PWM dimming signal is subjected to optical coupling isolation by the PWM dimming signal transmission compensation circuit and then is output to the secondary PWM dimming signal, and in the process, the rising edge time and the falling edge time of the secondary PWM dimming signal can be effectively shortened by utilizing the high-speed on-off capability of the field effect transistor, so that the waveform distortion degree of the secondary PWM dimming signal can be reliably reduced, and an engineer does not need to additionally carry out distortion compensation on the secondary PWM dimming signal, thereby shortening the development period of the engineer. In addition, when the PWM dimming signal transmission compensation circuit is in a power-off and power-off state, unnecessary circuit output errors can be avoided by arranging the diode component.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate and do not limit the utility model.
Fig. 1 is a schematic diagram of a PWM dimming signal transmission compensation circuit according to an embodiment of the present utility model;
fig. 2 is a schematic diagram of a PWM dimming signal transmission circuit in the prior art;
fig. 3 is a schematic diagram showing the signal transmission effect of the PWM dimming signal transmission circuit in the prior art when the PWM dimming signal transmission circuit is put into use;
fig. 4 is a schematic diagram of a signal transmission effect of a PWM dimming signal transmission compensation circuit when the PWM dimming signal transmission compensation circuit is put into use in an embodiment of the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
It should be noted that although functional block diagrams are depicted as block diagrams, and logical sequences are shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the block diagrams in the system. The terms first, second and the like in the description and in the claims and in the above-described figures, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Referring to fig. 1, fig. 1 is a schematic diagram of a PWM dimming signal transmission compensation circuit according to an embodiment of the utility model, wherein the circuit actually includes an input module 100, a photo coupler U1, a first output module 200, and a second output module 300.
In this embodiment, the circuit is further provided with a signal input terminal (i.e. pwm_c port in fig. 1), a signal output terminal (i.e. pwm_o port in fig. 1), and a first power supply terminal (i.e. pwm_o port in fig. 1)
+3.3V port) and a second power supply terminal (i.e., 5V port in fig. 1); the signal input end (i.e. the pwm_c port in fig. 1) is used for accessing the primary PWM dimming signal, the signal output end (i.e. the pwm_o port in fig. 1) is used for outputting the secondary PWM dimming signal, the first power supply end (i.e. the +3.3v port in fig. 1) is used for accessing the +3.3v dc power supply, and the second power supply end (i.e. the 5V port in fig. 1) is used for accessing the 5V dc power supply.
Specifically, the diode anode of the photo-coupler U1 is connected to the first power supply terminal (i.e., +3.3v port in fig. 1), the diode cathode of the photo-coupler U1 is connected to the output terminal of the input module 100, and the input terminal of the input module 100 is connected to the signal input terminal (i.e., pwm_c port in fig. 1); the triode collector of the photoelectric coupler U1 is connected with the second power supply end (namely the 5V port in FIG. 1), and the triode emitter of the photoelectric coupler U1 is directly grounded.
Specifically, the first output module 200 includes a first current limiting resistor R1, a protection resistor R2, a first switching tube Q1, and a second switching tube Q2; the grid electrode of the first switching tube Q1 is connected with one end of the first current limiting resistor R1, the other end of the first current limiting resistor R1 is connected with the second power supply end (i.e., the 5V port in fig. 1), the source electrode of the first switching tube Q1 is directly grounded, the drain electrode of the first switching tube Q1 is connected with the signal output end (i.e., the pwm_o port in fig. 1), the drain electrode of the first switching tube Q1 is also connected with the output end of the second output module 300, and the input end of the second output module 300 is connected with the second power supply end (i.e., the 5V port in fig. 1); the grid electrode of the second switching tube Q2 is connected with the triode emitter electrode of the photoelectric coupler U1, the source electrode of the second switching tube Q2 is directly grounded, and the drain electrode of the second switching tube Q2 is connected with the grid electrode of the first switching tube Q1.
The protection resistor R2 is connected in parallel between the triode emitter and the triode collector of the photoelectric coupler U1, so that the photoelectric coupler U1 can be reversely protected to avoid device damage caused by continuous rising of reverse voltage, and the protection resistor R2 should be set to have a larger resistance value in the embodiment, so that current basically flows through the photoelectric coupler U1; in addition, the first current limiting resistor R1 can prevent the device from being damaged due to the excessive current passing through the first switching tube Q1.
Specifically, the input module 100 includes a second current limiting resistor R3, a first bleeder resistor R4, and a third switching tube Q3; the gate of the third switching tube Q3 is connected to one end of the second current limiting resistor R3, the other end of the second current limiting resistor R3 is connected to the signal input end (i.e., pwm_c port in fig. 1), the source of the third switching tube Q3 is directly grounded, and the drain of the third switching tube Q3 is connected to the diode cathode of the photo coupler U1.
The first bleeder resistor R4 is connected in parallel between the source electrode and the grid electrode of the third switching tube Q3, so that not only can bias voltage be provided for the third switching tube Q3, but also a small amount of static electricity possibly occurring between the source electrode and the grid electrode of the third switching tube Q3 can be discharged, and the third switching tube Q3 is prevented from generating misoperation or even breakdown; in addition, the second current limiting resistor R3 can prevent the device from being damaged due to the excessive current passing through the third switching tube Q3.
Specifically, the second output module 300 includes a diode assembly formed by sequentially connecting a plurality of diodes end to end with a third current limiting resistor R5; the input end of the diode component is connected with one end of the third current limiting resistor R5, the other end of the third current limiting resistor R5 is connected with the second power supply end (namely a 5V port in FIG. 1), and the output end of the diode component is connected with the drain electrode of the first switching tube Q1; the third current limiting resistor R5 may realize a protection function for the diode assembly.
In this embodiment, the PWM dimming signal transmission compensation circuit is further preferably provided with a second bleeder resistor R6, a fourth current limiting resistor R7, and a fifth current limiting resistor R8; one end of the second bleeder resistor R6 is connected with the triode emitter of the photoelectric coupler U1, and the other end of the second bleeder resistor R6 is directly grounded and mainly plays a role in stabilizing a static working point; one end of the fourth current limiting resistor R7 is connected with the diode anode of the photo coupler U1, and the other end of the fourth current limiting resistor R7 is connected with the first power supply end (i.e., the +3.3v port in fig. 1); one end of the fifth current limiting resistor R8 is connected with a triode collector of the photoelectric coupler U1, and the other end of the fifth current limiting resistor R8 is connected with the second power supply end (namely a 5V port in FIG. 1); the fourth current limiting resistor R7 and the fifth current limiting resistor R8 are both provided to prevent the optocoupler U1 from being damaged by overcurrent.
In this embodiment, the first switching transistor Q1, the second switching transistor Q2 and the third switching transistor Q3 are all N-channel field effect transistors, and the reason why they are not transistors is as follows:
the switching speed of the field effect transistor is far greater than that of the triode, and the switching speed discreteness of the field effect transistor is far less than that of the triode, so that the waveform distortion degree of the secondary PWM dimming signal output by the signal output end (namely the PWM_O port in fig. 1) can be effectively reduced when the PWM dimming signal transmission compensation circuit provided by the embodiment is put into use; in addition, the triode is a current type control device, the amplification factor of the triode is required to be combined to match the base current and the collector current in advance, and the field effect transistor is a voltage type control device, so that the problem of current matching is not required to be considered, and the triode can be flexibly used.
In this embodiment, the PWM dimming signal transmission compensation circuit mainly performs the function of outputting the primary PWM dimming signal received by the signal input end (i.e. the pwm_c port in fig. 1) from the signal output end (i.e. the pwm_o port in fig. 1) after optocoupler isolation in the normal power supply state, and the specific implementation principle includes the following steps:
(1) When the signal input end (i.e. the pwm_c port in fig. 1) receives a high level, the third switching tube Q3 is in a conducting state, a current passes through a diode of the photo coupler U1, a triode of the photo coupler U1 is in a conducting state, at this time, the second switching tube Q2 is in a conducting state, the first switching tube Q1 is in a blocking state, and the signal output end (i.e. the pwm_o port in fig. 1) outputs a high level;
(2) When the signal input terminal (i.e. the pwm_c port in fig. 1) receives a low level, the third switching tube Q3 is in an off state, no current passes through the diode of the photo coupler U1, the triode of the photo coupler U1 is in an off state, at this time, the second switching tube Q2 is in an off state, the first switching tube Q1 is in an on state, and the signal output terminal (i.e. the pwm_o port in fig. 1) outputs a low level.
In this embodiment, the PWM dimming signal transmission compensation circuit may effectively reduce the waveform distortion degree of the secondary PWM dimming signal output by the signal output end (i.e. the pwm_o port in fig. 1), and is mainly implemented in effectively shortening the level conversion time of the secondary PWM dimming signal, which is described below in connection with the schematic structural diagram of the PWM dimming signal transmission circuit shown in fig. 2:
in the PWM dimming signal transmission circuit proposed in the prior art, when the pwm_c1 port in fig. 2 is switched from a low reception level to a high reception level, the potential of the triode emitter of the photo coupler u1_1 needs to gradually rise to the highest point, and the pwm_o1 port in fig. 2 can output the high level; similarly, when the pwm_c1 port in fig. 2 is switched from the receiving high level to the receiving low level, the potential of the transistor emitter of the photo coupler u1_1 needs to gradually drop to the lowest point, and the pwm_o1 port in fig. 2 can output the low level.
In the PWM dimming signal transmission compensation circuit according to this embodiment, when the signal input end (i.e. the pwm_c port in fig. 1) is switched from a low reception level to a high reception level, the potential of the triode emitter of the photo-coupler U1 only needs to gradually rise to the on voltage of the second switching tube Q2, so that the second switching tube Q2 is rapidly turned on and the first switching tube Q1 is rapidly turned off, and the second power supply end (i.e. the 5V port in fig. 1) is used to provide a high level output for the signal output end (i.e. the pwm_o port in fig. 1) without waiting for the potential of the triode emitter of the photo-coupler U1 to gradually rise to the highest point;
similarly, when the signal input end (i.e. the pwm_c port in fig. 1) is switched from the receiving high level to the receiving low level, the potential of the triode emitter of the photo-coupler U1 only needs to gradually drop to be smaller than the conducting voltage of the second switching tube Q2, so that the second switching tube Q2 is rapidly turned off and the first switching tube Q1 is rapidly turned on, without waiting for the potential of the triode emitter of the photo-coupler U1 to gradually drop to the lowest point, and the signal output end (i.e. the pwm_o port in fig. 1) can directly output the low level to the ground through the first switching tube Q1.
In a specific application process, for the PWM dimming signal transmission circuit shown in fig. 2, the resistance value of the resistor r3_1 is 1kΩ, the resistance value of the resistor r4_1 is 10kΩ, the resistance value of the resistor r6_1 is 4.7kΩ, the resistance value of the resistor r7_1 is 470 Ω, the resistance value of the resistor r8_1 is 0 Ω, and then any one primary PWM dimming signal is input into the PWM dimming signal transmission circuit for optical coupling isolation transmission processing, so as to obtain a signal transmission effect diagram shown in fig. 3;
for the PWM dimming signal transmission compensation circuit shown in fig. 1, the resistance values of the first current limiting resistor R1, the second current limiting resistor R3 and the third current limiting resistor R5 are all 1kΩ, the resistance value of the protection resistor R2 is 470kΩ, the resistance value of the first bleeder resistor R4 is 10kΩ, the resistance value of the second bleeder resistor R6 is 4.7kΩ, the resistance value of the fourth current limiting resistor R7 is 470 Ω, the resistance value of the fifth current limiting resistor R8 is 0 Ω, and then the same primary PWM dimming signal is input into the PWM dimming signal transmission compensation circuit for performing optical coupling isolation transmission processing, so as to obtain a signal transmission effect diagram shown in fig. 4;
as can be seen from comparing the waveforms of fig. 3 and fig. 4, for the secondary PWM dimming signal output by the signal output terminal (i.e., the pwm_o port in fig. 1), both the rising edge and the falling edge of the secondary PWM dimming signal become significantly steeper, which means that the rising edge time and the falling edge time of the currently output secondary PWM dimming signal are effectively shortened, so as to reliably reduce the waveform distortion degree of the currently output secondary PWM dimming signal.
In the present embodiment, the diode assembly is provided and the on voltage thereof is defined to be equal to or greater than the on voltage of the first switching tube Q1 for the following reasons:
when the PWM dimming signal transmission compensation circuit is in the power-off state, the signal input end (i.e. the pwm_c port in fig. 1) continuously inputs a low level, and at this time, the first switching tube Q1 will be maintained in a conducting state, so that the signal output end (i.e. the pwm_o port in fig. 1) continuously outputs a low level;
when the supply voltage provided by the second supply terminal (i.e. the 5V port in fig. 1) gradually drops below the on voltage of the first switching tube Q1, the first switching tube Q1 will switch to an off state, and the diode assembly cannot be in the on state at this time, so as to ensure that the signal output terminal (i.e. the pwm_o port in fig. 1) can stop outputting;
if the diode component is not provided, when the supply voltage provided by the second supply terminal (i.e. the 5V port in fig. 1) gradually drops below the on voltage of the first switching tube Q1, the first switching tube Q1 will switch to the off state, but the signal output terminal (i.e. the pwm_o port in fig. 1) will output the residual voltage, thereby causing unnecessary circuit output errors.
In a specific application process, the first switching tube Q1, the second switching tube Q2 and the third switching tube Q3 are N-channel field effect tubes with the model of SFY2N7002ATK, and the turn-on voltage is approximately 2V; the diode assembly may be formed by sequentially connecting the diode D1, the diode D2 and the diode D3 in series, as shown in fig. 1, and the diode D1, the diode D2 and the diode D3 are all diodes with a model T-1N4148WA, and the turn-on voltage is approximately 0.7V, i.e. the turn-on voltage of the diode assembly is actually 2.1V, which meets the setting requirement specified in the present embodiment.
In the embodiment of the utility model, the primary PWM dimming signal is output after being subjected to optical coupling isolation by the PWM dimming signal transmission compensation circuit, and the rising edge time and the falling edge time of the secondary PWM dimming signal can be effectively shortened by utilizing the high-speed on-off capability of the field effect transistor in the process, so that the waveform distortion degree of the secondary PWM dimming signal can be reliably reduced, and an engineer does not need to additionally carry out distortion compensation on the secondary PWM dimming signal, thereby shortening the development period of the engineer. In addition, when the PWM dimming signal transmission compensation circuit is in a power-off and power-off state, unnecessary circuit output errors can be avoided by arranging the diode component.
While the preferred embodiment of the present utility model has been described in detail, the present utility model is not limited to the above embodiment, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present utility model, and these equivalent modifications and substitutions are intended to be included in the scope of the present utility model as defined in the appended claims.
Claims (10)
1. The PWM dimming signal transmission compensation circuit is characterized by comprising a photoelectric coupler, an input module, a first output module and a second output module;
the input end of the input module is connected with the signal input end, the output end of the input module is connected with the diode cathode of the photoelectric coupler, and the diode anode of the photoelectric coupler is connected with the first power supply end; the triode collector of the photoelectric coupler is connected with the second power supply end, and the triode emitter of the photoelectric coupler is grounded;
the first output module comprises a first switching tube, a second switching tube and a first current limiting resistor, wherein the grid electrode of the first switching tube is connected with the second power supply end through the first current limiting resistor, the drain electrode of the first switching tube is connected with the signal output end, and the source electrode of the first switching tube is grounded; the grid electrode of the second switching tube is connected with the triode emitter of the photoelectric coupler, the drain electrode of the second switching tube is connected with the grid electrode of the first switching tube, and the source electrode of the second switching tube is grounded;
the input end of the second output module is connected with the second power supply end, and the output end of the second output module is connected with the drain electrode of the first switch tube.
2. The PWM dimming signal transmission compensation circuit of claim 1, wherein the input module comprises a third switching tube and a second current limiting resistor;
the grid electrode of the third switching tube is connected with the signal input end through the second current limiting resistor, the drain electrode of the third switching tube is connected with the diode cathode of the photoelectric coupler, and the source electrode of the third switching tube is grounded.
3. The PWM dimming signal transmission compensation circuit of claim 2, wherein the input module further comprises a first bleeder resistor connected in parallel between the gate and source of the third switching tube.
4. The PWM dimming signal transmission compensation circuit of claim 1, wherein the second output module comprises a diode assembly and a third current limiting resistor, the diode assembly being formed by a plurality of diodes connected end to end in sequence;
the input end of the diode component is connected with the second power supply end through the third current limiting resistor, and the output end of the diode component is connected with the drain electrode of the first switching tube.
5. The PWM dimming signal transmission compensation circuit of claim 4, wherein the turn-on voltage of the diode assembly is not less than the turn-on voltage of the first switching tube.
6. The PWM dimming signal transmission compensation circuit of claim 2, wherein the first, second and third switching transistors are N-channel field effect transistors.
7. The PWM dimming signal transmission compensation circuit of claim 1, wherein the first output module further comprises a protection resistor connected in parallel between a triode collector and a triode emitter of the optocoupler.
8. The PWM dimming signal transmission compensation circuit of claim 1, further comprising a second bleeder resistor, the triode emitter of the optocoupler being grounded through the second bleeder resistor.
9. The PWM dimming signal transmission compensation circuit of claim 1, further comprising a fourth current limiting resistor, wherein a diode anode of the optocoupler is connected to the first power supply terminal through the fourth current limiting resistor.
10. The PWM dimming signal transmission compensation circuit of claim 1, further comprising a fifth current limiting resistor, wherein a triode collector of the optocoupler is connected to the second power supply terminal through the fifth current limiting resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320372828.4U CN219834431U (en) | 2023-02-28 | 2023-02-28 | PWM dimming signal transmission compensation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320372828.4U CN219834431U (en) | 2023-02-28 | 2023-02-28 | PWM dimming signal transmission compensation circuit |
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| Publication Number | Publication Date |
|---|---|
| CN219834431U true CN219834431U (en) | 2023-10-13 |
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|---|---|---|---|
| CN202320372828.4U Active CN219834431U (en) | 2023-02-28 | 2023-02-28 | PWM dimming signal transmission compensation circuit |
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| CN (1) | CN219834431U (en) |
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- 2023-02-28 CN CN202320372828.4U patent/CN219834431U/en active Active
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