CN110729891A - Analog control circuit of optical switch - Google Patents
Analog control circuit of optical switch Download PDFInfo
- Publication number
- CN110729891A CN110729891A CN201911177934.1A CN201911177934A CN110729891A CN 110729891 A CN110729891 A CN 110729891A CN 201911177934 A CN201911177934 A CN 201911177934A CN 110729891 A CN110729891 A CN 110729891A
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- Prior art keywords
- circuit
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- input
- optical switch
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/157—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with digital control
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The invention relates to an analog control circuit of an optical switch, which comprises a voltage input filter circuit, an electricity-proof power supply inverting circuit, a DC/DC voltage reduction and stabilization circuit, a DC/DC booster circuit, a signal input circuit, a high-speed operation circuit, a signal amplification circuit and an output circuit, wherein the input end of the voltage input filter circuit is connected with the input end of the electricity-proof power supply inverting circuit, the output end of the electricity-proof power supply inverting circuit is respectively connected with the input ends of the DC/DC voltage reduction and stabilization circuit and the DC/DC booster circuit, and the output end of the DC/DC booster circuit is respectively connected with the input ends of the signal amplification circuit and the output circuit. The circuit of the invention adopts analog quantity control, and can adjust the light power output by the rear end of the switch as required, thereby solving the problem of adjusting the light power output which cannot be solved by a digital switch; meanwhile, the circuit is compatible with all functions of the existing digital switch, and can be used for digital control and analog control.
Description
Technical Field
The invention belongs to the technical field of optical switches, and particularly relates to an analog control circuit of an optical switch.
Background
With the development of optoelectronic technology, optical communication has been advanced to various industries, and gradually replaced the traditional communication mode in various fields such as industry, household, and the like. In the communication industry, in order to reasonably use communication resources, various switches and control switches are often added in an optical loop, and the traditional method is to adopt a digital switch mode, namely, the optical loop can only be switched on or switched off. Can not meet the requirements of some special working conditions. In view of the above, it is necessary to provide a more efficient circuit.
Disclosure of Invention
The invention aims to provide an analog control circuit of an optical switch, which adopts analog quantity control and can adjust the optical power output by the rear end of the switch as required so as to solve the problem of adjustment of the optical power output which cannot be solved by a digital switch; meanwhile, the circuit is compatible with all functions of the existing digital switch, and can be used for digital control and analog control; the product has simple structure, small volume and low cost.
In order to achieve the above object, the present invention has the following technical means.
An analog control circuit of an optical switch comprises a voltage input filter circuit, a power-supply-preventing reverse circuit, a DC/DC voltage reduction and stabilization circuit, a DC/DC booster circuit, a signal input circuit, a high-speed arithmetic circuit, a signal amplification circuit and an output circuit, wherein the input end of the voltage input filter circuit is connected with the input end of the power-supply-preventing reverse circuit, the output end of the power-supply-preventing reverse circuit is respectively connected with the input ends of the DC/DC voltage reduction and stabilization circuit and the DC/DC booster circuit, and the output end of the DC/DC booster circuit is respectively connected with the input ends of the signal amplification circuit and the output circuit; the output end of the DC/DC voltage reduction and stabilization circuit is connected with the input end of the high-speed operation circuit; the output end of the signal input circuit is connected with the input end of the high-speed operation circuit; the output end of the high-speed operation circuit is connected with the input end of the signal amplification circuit; the output end of the signal amplifying circuit is connected with the input end of the signal amplifying circuit.
Furthermore, the input side of the voltage input filter circuit adopts a universal interface 5.5-2.1MM interface, and the interior of the voltage input filter circuit adopts ruby capacitor energy storage filtering.
Further, the DC/DC voltage reduction and stabilization circuit stabilizes 12V into a 5V power supply, and a 78M05 is added to supply power to the chip.
Further, the DC/DC booster circuit BOOSTs 12V into 410V voltage through the BOOST booster circuit, and supplies the 410V voltage to the power supply of the amplifying circuit.
Furthermore, the high-speed operational circuit adopts a high-speed operational amplifier, calculates the amplification ratio according to the requirement, and outputs and drives a post-stage amplification triode.
Furthermore, the signal amplifying circuit adopts a group of PNP and NPN high-voltage triode as an amplifying tube.
The invention has the beneficial effects that: the circuit of the invention adopts analog quantity control, and can adjust the light power output by the rear end of the switch as required, thereby solving the problem of adjusting the light power output which cannot be solved by a digital switch; meanwhile, the circuit is compatible with all functions of the existing digital switch, and can be used for digital control and analog control.
Drawings
FIG. 1 is a block diagram of the circuit connections used in an embodiment of the present invention.
Fig. 2 is a circuit diagram of a voltage input filter used in an embodiment of the present invention.
FIG. 3 is a diagram of a DC/DC buck regulator circuit used in an embodiment of the present invention.
Fig. 4 is a diagram of a DC/DC boost circuit used in an embodiment of the present invention.
FIG. 5 is a high speed operation circuit used in the embodiment of the present invention.
Fig. 6 is a diagram of a signal amplification circuit used in an embodiment of the present invention.
Fig. 7 is a schematic diagram of the signal amplification principle used in the present invention.
Fig. 8 is a schematic diagram of a signal output circuit used in the present invention.
Detailed Description
The invention will be better understood from the following description of specific embodiments thereof with reference to the accompanying drawings and examples.
Examples
As shown in fig. 1, the analog control circuit of an optical switch in this embodiment includes a voltage input filter circuit, a power-proof anti-reverse circuit, a DC/DC voltage-reducing and voltage-stabilizing circuit, a DC/DC voltage-boosting circuit, a signal input circuit, a high-speed operation circuit, a signal amplification circuit and an output circuit, wherein an input end of the voltage input filter circuit is connected to an input end of the power-proof anti-reverse circuit, an output end of the power-proof anti-reverse circuit is connected to input ends of the DC/DC voltage-reducing and voltage-stabilizing circuit and the DC/DC voltage-boosting circuit, and an output end of the DC/DC voltage-boosting circuit is connected to input ends of the signal amplification circuit and the output circuit; the output end of the DC/DC voltage reduction and stabilization circuit is connected with the input end of the high-speed operation circuit; the output end of the signal input circuit is connected with the input end of the high-speed operation circuit; the output end of the high-speed operation circuit is connected with the input end of the signal amplification circuit; the output end of the signal amplifying circuit is connected with the input end of the signal amplifying circuit.
As shown in FIG. 2, the input side of the voltage input filter circuit adopts a universal interface 5.5-2.1MM interface, and the interior of the voltage input filter circuit adopts ruby capacitor energy storage filtering.
As shown in FIG. 3, the DC/DC buck regulator circuit regulates 12V to 5V power, and adds a 78M05 to supply power to the chip.
As shown in fig. 4, the DC/DC BOOST circuit BOOSTs 12V to 410V through the BOOST circuit for the power supply of the amplifier circuit.
As shown in fig. 5, the high-speed operational circuit employs a high-speed operational amplifier, calculates an amplification ratio according to a demand, and outputs and drives a post-stage amplification triode.
As shown in fig. 6, the signal amplifying circuit uses a group of PNP and NPN high voltage transistors as the amplifying transistor.
The analog control circuit of the optical switch in the embodiment can be used for controlling the on-off of the optical fiber transmission switch, controlling the on-off size of the optical fiber transmission switch and controlling the optical transmission power; the direct current output by the DC/DC conversion circuit is adopted for voltage reduction so as to supply power to the power supply circuit, and the direct current output by the DC/DC conversion circuit is used for voltage boosting so as to supply power to the driving power supply circuit; the optical switch is used for switching in a digital signal to control the optical switch to be switched on and off in a digital quantity mode; the optical switch is used for switching in an analog signal to control the optical switch to be switched on and off in an analog mode; the port access is used for manually operating the on-off of the optical switch; the port access is used for manually operating the output size of the continuous control switch.
The specific working principle of the invention is as follows: fig. 7 shows a conventional booster power supply circuit. When the inductor is designed to work in a continuous mode, if voltage drops of the inductor, the switching tube and the diode are neglected, the duty ratio D of the boost power supply with the 12V input and the 410V output can be calculated by the following formula.
D＝(Vo-VI)/Vo＝(410-12)/410＝97.1％
This requires that the duty cycle of the boost chip be above 97.1%. Also, in continuous current mode, the control loop will exhibit a right half-plane zero which will increase the amplitude gain but reduce the phase margin. The larger the duty cycle, the lower the frequency point of the right half-plane zero. When the duty ratio reaches more than 97.1%, the frequency of the right half-plane zero point is already low, and if the right half-plane zero point enters the bandwidth of a loop, the loop is unstable. When this occurs, the output voltage does not rise to the target value at all times. This problem is solved only by further reducing the bandwidth, but this results in a poor dynamic response. From the physical aspect, when the duty ratio is large, the turn-off time of the switching tube is short, so that the energy stored in the inductor cannot be completely transferred to the load in the short time, and therefore the output voltage is reduced. The minimum inductance to maintain the inductor in continuous mode can be calculated according to the following formula, where D is 97.1%.
When the switching frequency f is 1.6MHz, it is calculated that when the inductance L is larger than 23.2uH, the inductor can work in a continuous mode under the condition that the output current Io is 2 mA. Generally, the inductance volume above 23uH is relatively large.
The inductance is further reduced until the current through the inductor in each switching cycle drops to zero, so that the inductor operates in discontinuous mode. The discontinuous mode has a smaller duty cycle than the continuous mode for the same voltage, power and switching frequency, and is related to the load current level. The duty cycle of the discontinuous mode is calculated as a formula.
From the above formula, the smaller the inductance L, the smaller the duty ratio D. In addition, the peak value IPK of the inductor current in the discontinuous mode can be calculated by the formula
The formula shows that the smaller the inductance L, the larger the peak current IPK, which requires a chip and an inductor with larger current. At the same time, a larger peak current also means a larger output voltage ripple. Therefore, when designing the discontinuous mode circuit, the duty cycle, the peak current and the ripple need to be balanced, and the design is performed by using a proper chip and an inductor. In terms of chip voltage, the input working voltage of the power supply chip is required to be as low as 12V and the output voltage is required to be higher than 410V to meet the requirement no matter in a continuous mode or a discontinuous mode. The output voltage range of the current 12V input boost converter chip is generally within 70V. In order to realize the output of 410V, a voltage doubling circuit needs to be used.
The voltage doubling circuit boosts the output voltage by an integral multiple by using a transformer or a charge pump. It can realize higher output voltage on the current boost chip. Under the continuous current mode, the voltage doubling circuit can also obviously reduce the duty ratio, reduce the required inductance and enlarge the selection range of the chip and the inductance.
The charge pump is a circuit which multiplies the alternating voltage to a higher voltage by utilizing the energy storage of a capacitor and the unidirectional conduction characteristic of a diode. The input voltage can be raised to 2 times, 3 times or even higher times the voltage peak UI by different series of capacitor and diode combinations. The advantage of this capacitive voltage doubler circuit is that no matter how many times the UI is finally raised, no too high surge voltage will appear on the input power, so that a power supply with higher output voltage can be designed by using a low voltage chip, as shown in fig. 8.
Compared with the prior art, the invention can realize the design of a boosting power supply with 12V input and 410V/2mA output by combining the boosting and charge pump circuits, and can meet the requirements of small volume, low ripple and low cost. The boost converter chip selects a chip with the output reaching 80V, and then 480V output can be realized through the 6-stage voltage doubling circuit.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (6)
1. An analog control circuit for an optical switch, comprising: the anti-power-supply anti-reverse circuit comprises a voltage input filter circuit, an anti-power-supply anti-reverse circuit, a DC/DC voltage reduction and stabilization circuit, a DC/DC booster circuit, a signal input circuit, a high-speed operation circuit, a signal amplification circuit and an output circuit, wherein the input end of the voltage input filter circuit is connected with the input end of the anti-power-supply anti-reverse circuit, the output end of the anti-power-supply anti-reverse circuit is respectively connected with the input ends of the DC/DC voltage reduction and stabilization circuit and the DC/DC booster circuit, and the output end of the DC/DC booster circuit is respectively connected with the input ends of the signal; the output end of the DC/DC voltage reduction and stabilization circuit is connected with the input end of the high-speed operation circuit; the output end of the signal input circuit is connected with the input end of the high-speed operation circuit; the output end of the high-speed operation circuit is connected with the input end of the signal amplification circuit; and the output end of the signal amplification circuit is connected with the input end of the signal amplification circuit.
2. An analog control circuit for an optical switch according to claim 1, wherein: the input side of the voltage input filter circuit adopts a universal interface 5.5-2.1MM interface, and the interior of the voltage input filter circuit adopts ruby capacitor energy storage filtering.
3. An analog control circuit for an optical switch according to claim 1, wherein: the DC/DC voltage reduction and stabilization circuit stabilizes 12V to a 5V power supply, and a 78M05 is added to supply power to the chip.
4. An analog control circuit for an optical switch according to claim 1, wherein: the DC/DC booster circuit BOOSTs 12V voltage into 410V voltage through the BOOST booster circuit, and the 410V voltage is supplied to an amplifying circuit power supply.
5. An analog control circuit for an optical switch according to claim 1, wherein: the high-speed operational circuit adopts a high-speed operational amplifier, calculates the amplification proportion according to the requirement, and outputs and drives a post-stage amplification triode.
6. An analog control circuit for an optical switch according to claim 1, wherein: the signal amplification circuit adopts a group of PNP and NPN high-voltage triode as an amplification tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911177934.1A CN110729891A (en) | 2019-11-27 | 2019-11-27 | Analog control circuit of optical switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911177934.1A CN110729891A (en) | 2019-11-27 | 2019-11-27 | Analog control circuit of optical switch |
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| Publication Number | Publication Date |
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| CN110729891A true CN110729891A (en) | 2020-01-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911177934.1A Pending CN110729891A (en) | 2019-11-27 | 2019-11-27 | Analog control circuit of optical switch |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006172806A (en) * | 2004-12-14 | 2006-06-29 | Koito Mfg Co Ltd | Lighting control circuit of vehicular lighting fixture |
| CN101694968A (en) * | 2009-05-14 | 2010-04-14 | 绿达光电股份有限公司 | Numerically controlled switching type power supply |
| US20140167648A1 (en) * | 2012-12-18 | 2014-06-19 | Richtek Technology Corporation | Power converter circuit for low power illumination device, control circuit thereof and method thereof |
| CN108768174A (en) * | 2018-06-15 | 2018-11-06 | 哈尔滨工业大学深圳研究生院 | A kind of analog-digital hybrid formula multiphase interleaving power inverter |
| CN208094847U (en) * | 2018-04-10 | 2018-11-13 | 浙江榆阳电子有限公司 | A kind of efficient low ripple dimming LED drive circuit |
| CN109193901A (en) * | 2018-10-16 | 2019-01-11 | 广东电网有限责任公司 | A kind of power-supply system of data acquisition equipment |
-
2019
- 2019-11-27 CN CN201911177934.1A patent/CN110729891A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006172806A (en) * | 2004-12-14 | 2006-06-29 | Koito Mfg Co Ltd | Lighting control circuit of vehicular lighting fixture |
| CN101694968A (en) * | 2009-05-14 | 2010-04-14 | 绿达光电股份有限公司 | Numerically controlled switching type power supply |
| US20140167648A1 (en) * | 2012-12-18 | 2014-06-19 | Richtek Technology Corporation | Power converter circuit for low power illumination device, control circuit thereof and method thereof |
| CN208094847U (en) * | 2018-04-10 | 2018-11-13 | 浙江榆阳电子有限公司 | A kind of efficient low ripple dimming LED drive circuit |
| CN108768174A (en) * | 2018-06-15 | 2018-11-06 | 哈尔滨工业大学深圳研究生院 | A kind of analog-digital hybrid formula multiphase interleaving power inverter |
| CN109193901A (en) * | 2018-10-16 | 2019-01-11 | 广东电网有限责任公司 | A kind of power-supply system of data acquisition equipment |
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Application publication date: 20200124 |