CN112260542A - Circuit for realizing on/off signal isolation transmission function and control method - Google Patents
Circuit for realizing on/off signal isolation transmission function and control method Download PDFInfo
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- CN112260542A CN112260542A CN202010937569.6A CN202010937569A CN112260542A CN 112260542 A CN112260542 A CN 112260542A CN 202010937569 A CN202010937569 A CN 202010937569A CN 112260542 A CN112260542 A CN 112260542A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a circuit for realizing the function of transmitting on/off signals in an isolating way, which comprises a transformer, a primary side circuit and a secondary side circuit; the primary circuit comprises an auxiliary source module, a voltage ring connected with the auxiliary source module and a control signal input module connected to a first input end of the voltage ring; the first input end of the voltage ring and the positive electrode of the voltage source are respectively connected with two ends of the second resistor; the third resistor and the fourth resistor are connected in series, and the connection end of the third resistor and the fourth resistor is connected with the second input end of the voltage ring; the other end of the third resistor is connected with the negative electrode of the voltage source, and the other end of the fourth resistor is connected with the auxiliary source module; the secondary side circuit comprises a diode and a capacitor which are connected in series with two ends of a secondary side winding of the transformer, and a fifth resistor and a sixth resistor which are connected in series with two ends of the capacitor; the connection end of the diode and the capacitor is connected with the LDO module, the connection end of the fifth resistor and the sixth resistor is connected with the MCU, and the LDO module is connected with the MCU. The circuit for realizing the function of transmitting the on/off signals in an isolating way has the advantages of simple circuit, low cost, easy realization, good thermal stability and the like.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a circuit for realizing the function of transmitting an on/off signal in an isolation manner and a control method.
Background
At present, in the application of a high-end power supply, in order to ensure the signal stability and safety of the power supply, an on/off control signal sampling circuit and a control circuit need to be electrically isolated so as to meet the functional requirements of the power supply. To achieve this function, it is often necessary to design the coupling circuit to not only provide electrical isolation, but also to pass on/off control signals. However, in the prior art, such a circuit is often built in a photoelectric manner, and not only are many electronic components required and large in occupied volume, but also the devices are difficult to arrange under the condition of limited available space and poor in thermal stability.
Disclosure of Invention
The invention aims to provide a circuit for realizing the function of transmitting an on/off signal in an isolating way and a control method thereof.
In order to overcome the above-mentioned drawbacks in the prior art, an embodiment of the present invention provides a circuit for implementing a function of isolating a passing on/off signal, including: the transformer, the primary circuit and the secondary circuit;
the primary side circuit includes:
the transformer comprises an auxiliary source module connected with a primary winding of the transformer, a voltage ring module connected with the auxiliary source module, and a control signal input module connected to a first input end of the voltage ring module through a first resistor; wherein the content of the first and second substances,
the first input end of the voltage ring module and the anode of the voltage source module are respectively connected with two ends of the second resistor; the third resistor and the fourth resistor are connected in series, and the connecting end of the third resistor and the fourth resistor is connected to the second input end of the voltage ring module; the other end of the third resistor is connected with the negative electrode of the voltage source module, and the other end of the fourth resistor is connected to the auxiliary source module;
the secondary side circuit comprises:
a first diode and a first capacitor are connected in series to two ends of a secondary winding of the transformer, and a fifth resistor and a sixth resistor are connected in series to two ends of the first capacitor;
the first diode with the LDO module is connected to the link of first electric capacity, fifth resistance R200 with the MCU module is connected to the link of sixth resistance, the LDO module with the MCU module is connected.
Furthermore, the negative electrode of the voltage source module is grounded, and the connection end of the first capacitor and the sixth resistor is grounded.
Further, the first capacitor is an electrolytic capacitor.
Further, the fifth resistor and the sixth resistor are connected in series to two ends of the first capacitor, and the fifth resistor and the sixth resistor include: the fifth resistor is connected with the anode of the first capacitor, and the sixth resistor is connected with the cathode of the first capacitor.
Furthermore, the circuit for realizing the function of transmitting on/off signals in an isolation way also comprises a PWM control and protection circuit module connected with the MCU module and a switching power supply power module connected with the PWM control and protection circuit module, wherein,
one end of the switching power supply power module is connected with the auxiliary source module, and the other end of the switching power supply power module is connected with a load.
Further, the power module of the switching power supply is a topology structure of any switching power supply.
The embodiment of the invention also provides a control method of a circuit for realizing the function of isolating and transmitting the on/off signals, which comprises the following steps: and receiving the input voltage transmitted by the connection end of the fifth resistor and the sixth resistor, and generating an output control voltage according to the detected result of the change of the high and low levels of the input signal so as to realize the function of transmitting an on/off signal in an isolating way.
Compared with the prior art, the circuit capable of realizing the function of transmitting the on/off signals in an isolated mode can effectively realize the function of transmitting the on/off signals in an isolated mode by changing the auxiliary source, and has the advantages of being simple in circuit, few in devices, low in cost, easy to realize, good in thermal stability and the like.
Drawings
FIG. 1 is a schematic diagram of a circuit for implementing an isolated on/off signal function according to an embodiment of the present invention;
fig. 2 is a diagram of an application of a circuit for implementing an isolated on/off signal transfer function in a power supply system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present invention provides a circuit for implementing an on/off signal isolation function, including: a transformer 10, a primary side circuit 20 and a secondary side circuit 30;
the primary side circuit 20 includes:
the transformer comprises an auxiliary source module 201 connected with a primary winding of the transformer 10, a voltage ring module 202 connected with the auxiliary source module 201, and a control signal input module 203 connected to a first input end of the voltage ring module 202 through a first resistor R100; wherein the content of the first and second substances,
the first input end of the voltage ring module 202 and the anode of the voltage source module 40 are respectively connected with two ends of a second resistor; the third resistor R103 and the fourth resistor R102 are connected in series, and the connection end of the third resistor R103 and the fourth resistor R102 is connected to the second input end of the voltage ring module 202; the other end of the third resistor R103 is connected to the negative electrode of the voltage source module 40, and the other end of the fourth resistor R102 is connected to the auxiliary source module 201;
the secondary side circuit 30 includes:
a first diode D200 and a first capacitor C200 are connected in series to two ends of a secondary winding of the transformer, and a fifth resistor R200 and a sixth resistor R201 are connected in series to two ends of the first capacitor C200;
the first diode D200 with LDO module 301 is connected to the link of first electric capacity C200, fifth resistance R200 with MCU module 302 is connected to the link of sixth resistance R201, LDO module 301 with MCU module 302 is connected.
Further, the negative electrode of the voltage source module 40 is grounded, and the connection end of the first capacitor C200 and the sixth resistor R201 is grounded.
In this embodiment, it should be noted that the auxiliary source circuit is configured to provide a supply voltage for the primary side signal circuit and the secondary side signal circuit of the main power supply system, respectively. The auxiliary source module 201, the voltage loop module 202, the second resistor R101, the voltage source 40(Vref), the third resistor R103, the fourth resistor R102, and the primary side portion of the transformer 10 jointly generate an output voltage Vout _ vcc to provide a supply voltage for the primary side signal circuit. The secondary side of the transformer 10, the first diode D200, and the first capacitor C200 are coupled to generate a voltage Vsec _ vcc, which passes through the LDO module 301 to provide a supply voltage for the MCU module 302 and the PWM control and protection circuit module 50.
The circuit capable of realizing the function of transmitting the on/off signals in the isolated mode can effectively realize the function of transmitting the on/off signals in the isolated mode by changing the auxiliary source, and has the advantages of being simple in circuit, few in devices, low in cost, easy to realize, good in thermal stability and the like.
In one exemplary embodiment of the present invention, the first capacitor C200 is an electrolytic capacitor, wherein the electrolytic capacitor generally comprises a metal foil (aluminum/tantalum) as a positive electrode, an insulating oxide layer (aluminum oxide/tantalum pentoxide) of the metal foil as a dielectric, and the electrolytic capacitor is divided into an aluminum electrolytic capacitor and a tantalum electrolytic capacitor according to the difference of the positive electrode. The negative electrode of the aluminum electrolytic capacitor is composed of a thin paper/film or an electrolytic polymer soaked with an electrolyte solution (liquid electrolyte); manganese dioxide is generally used as the negative electrode of the tantalum electrolytic capacitor, and the polar electrolytic capacitor generally plays roles of power filtering, decoupling, signal coupling, time constant setting, direct current blocking and the like in a power circuit or a medium-frequency and low-frequency circuit. When the filter capacitor is used in a direct current power supply circuit, the anode (positive pole) of the filter capacitor is connected with the positive pole end of the power supply voltage, and the cathode (negative pole) of the filter capacitor is connected with the negative pole end of the power supply voltage, so that the filter capacitor cannot be reversely connected, otherwise, the filter capacitor can be damaged.
In an exemplary embodiment of the present invention, the connecting of the fifth resistor R200 and the sixth resistor R201 in series to the two ends of the first capacitor C200 includes: the fifth resistor R200 is connected to the positive electrode of the first capacitor C200, and the sixth resistor R201 is connected to the negative electrode of the first capacitor C200.
Referring to fig. 2, in an exemplary embodiment of the present invention, the circuit for implementing the function of transmitting an on/off signal in an isolated manner further includes a PWM control and protection circuit module connected to the MCU module 302, and a switching power module 60 connected to the PWM control and protection circuit module 50, where one end of the switching power module 60 is connected to the auxiliary power module 201, and the other end is connected to a load.
Further, the switching power supply power module 60 is a topology structure of any switching power supply.
The PWM control and protection circuit is used to control and protect the main power system, and at the same time, can receive the output control signal related to the on/off control signal transmitted by the MCU module 302, so as to realize indirect control of the main power system by the on/off signal.
The embodiment of the invention also provides a control method of a circuit for realizing the function of isolating and transmitting the on/off signals, which comprises the following steps: and receiving the input voltage transmitted by the connection end of the fifth resistor R200 and the sixth resistor R201, and generating an output control voltage according to the detected result of the change of the high and low levels of the input signal so as to realize the function of isolating and transmitting an on/off signal.
The first resistor R100 transmits an on/off control signal to a voltage loop module in the auxiliary source circuit through a superposition theorem, so that the reference voltage collected by the voltage loop module is changed, and Vout _ vcc and Vsec _ vcc are correspondingly changed.
The fifth resistor R200 and the sixth resistor R201 input a Vsec _ vcc signal related to an on/off control signal to the MCU module through resistor voltage division, and the MCU module generates an output control signal to the PWM control and protection circuit module after correspondingly processing the detected signal, thereby realizing the function of controlling the main output of the power supply system by transmitting the on/off signal in an isolated manner.
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 (7)
1. A circuit for implementing a function of isolating on/off signals from each other, comprising: the transformer, the primary circuit and the secondary circuit;
the primary side circuit includes:
the transformer comprises an auxiliary source module connected with a primary winding of the transformer, a voltage ring module connected with the auxiliary source module, and a control signal input module connected to a first input end of the voltage ring module through a first resistor; wherein the content of the first and second substances,
the first input end of the voltage ring module and the anode of the voltage source module are respectively connected with two ends of the second resistor; the third resistor and the fourth resistor are connected in series, and the connecting end of the third resistor and the fourth resistor is connected to the second input end of the voltage ring module; the other end of the third resistor is connected with the negative electrode of the voltage source module, and the other end of the fourth resistor is connected to the auxiliary source module;
the secondary side circuit comprises:
a first diode and a first capacitor are connected in series to two ends of a secondary winding of the transformer, and a fifth resistor and a sixth resistor are connected in series to two ends of the first capacitor;
the first diode with the LDO module is connected to the link of first electric capacity, fifth resistance R200 with the MCU module is connected to the link of sixth resistance, the LDO module with the MCU module is connected.
2. The circuit for realizing the function of transmitting an on/off signal in an isolated manner according to claim 1, wherein the negative pole of the voltage source module is grounded, and the connection end of the first capacitor and the sixth resistor is grounded.
3. The circuit for performing the function of isolating and passing on/off signals of claim 1, wherein the first capacitor is an electrolytic capacitor.
4. The circuit for realizing the function of transmitting an on/off signal in an isolated manner according to claim 1, wherein the fifth resistor and the sixth resistor are connected in series to two ends of the first capacitor, and the circuit comprises: the fifth resistor is connected with the anode of the first capacitor, and the sixth resistor is connected with the cathode of the first capacitor.
5. The circuit for realizing the function of transmitting on/off signals in an isolating way according to claim 1, further comprising a PWM control and protection circuit module connected with the MCU module and a switching power supply power module connected with the PWM control and protection circuit module; one end of the switching power supply power module is connected with the auxiliary source module, and the other end of the switching power supply power module is connected with a load.
6. The circuit for realizing the function of transmitting on/off signals in an isolated manner according to claim 5, wherein the switching power supply power module is a topological structure of any switching power supply.
7. A control method for realizing a circuit for isolating and transmitting an on/off signal is characterized by comprising the following steps: and receiving the input voltage transmitted by the connection end of the fifth resistor and the sixth resistor, and generating an output control voltage according to the detected result of the change of the high and low levels of the input signal so as to realize the function of transmitting an on/off signal in an isolating way.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010937569.6A CN112260542A (en) | 2020-09-07 | 2020-09-07 | Circuit for realizing on/off signal isolation transmission function and control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010937569.6A CN112260542A (en) | 2020-09-07 | 2020-09-07 | Circuit for realizing on/off signal isolation transmission function and control method |
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| Publication Number | Publication Date |
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| CN112260542A true CN112260542A (en) | 2021-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010937569.6A Pending CN112260542A (en) | 2020-09-07 | 2020-09-07 | Circuit for realizing on/off signal isolation transmission function and control method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105099210A (en) * | 2015-09-17 | 2015-11-25 | 绵阳市维博电子有限责任公司 | Electric quantity isolation sensor |
| CN106921296A (en) * | 2017-04-20 | 2017-07-04 | 中国电子科技集团公司第四十三研究所 | A kind of transmitted in both directions magnetic isolation feedback circuit and its implementation |
| CN109194143A (en) * | 2018-11-13 | 2019-01-11 | 江苏兆能电子有限公司 | A kind of isolation detection route of digital switch power supply medium-long range switching signal |
| CN110932559A (en) * | 2019-12-03 | 2020-03-27 | 成都长城开发科技有限公司 | Power module of ammeter |
-
2020
- 2020-09-07 CN CN202010937569.6A patent/CN112260542A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105099210A (en) * | 2015-09-17 | 2015-11-25 | 绵阳市维博电子有限责任公司 | Electric quantity isolation sensor |
| CN106921296A (en) * | 2017-04-20 | 2017-07-04 | 中国电子科技集团公司第四十三研究所 | A kind of transmitted in both directions magnetic isolation feedback circuit and its implementation |
| CN109194143A (en) * | 2018-11-13 | 2019-01-11 | 江苏兆能电子有限公司 | A kind of isolation detection route of digital switch power supply medium-long range switching signal |
| CN110932559A (en) * | 2019-12-03 | 2020-03-27 | 成都长城开发科技有限公司 | Power module of ammeter |
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Address after: 201600 Building 1, 469 sanbang Road, Songjiang District, Shanghai Applicant after: Shanghai Juntao Technology Co.,Ltd. Address before: 201600 Building 1, 469 sanbang Road, Songjiang District, Shanghai Applicant before: SHANGHAI JUNTAO POWER EQUIPMENT Co.,Ltd. |
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Application publication date: 20210122 |