CN115065421B - Dual-path isolation output rectifying circuit, interface circuit board and electrical equipment - Google Patents

Dual-path isolation output rectifying circuit, interface circuit board and electrical equipment Download PDF

Info

Publication number
CN115065421B
CN115065421B CN202210593545.2A CN202210593545A CN115065421B CN 115065421 B CN115065421 B CN 115065421B CN 202210593545 A CN202210593545 A CN 202210593545A CN 115065421 B CN115065421 B CN 115065421B
Authority
CN
China
Prior art keywords
output
isolation
rectifying diode
module
diode
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.)
Active
Application number
CN202210593545.2A
Other languages
Chinese (zh)
Other versions
CN115065421A (en
Inventor
周立功
郑暖
耿陈毅
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.)
Guangzhou Zhiyuan Electronics Co Ltd
Original Assignee
Guangzhou Zhiyuan Electronics 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 Guangzhou Zhiyuan Electronics Co Ltd filed Critical Guangzhou Zhiyuan Electronics Co Ltd
Priority to CN202210593545.2A priority Critical patent/CN115065421B/en
Publication of CN115065421A publication Critical patent/CN115065421A/en
Application granted granted Critical
Publication of CN115065421B publication Critical patent/CN115065421B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
    • 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
    • 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
    • H02M3/33569—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 having several active switching elements
    • H02M3/33573—Full-bridge at primary side of an isolation transformer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L2012/40208—Bus networks characterized by the use of a particular bus standard
    • H04L2012/40215—Controller Area Network CAN
    • 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
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The embodiment of the application provides a double-path isolation output rectifying circuit, an interface circuit board and electrical equipment, wherein the circuit comprises a transformer module, a first isolation output module and a second isolation output module, the input end of the transformer module is connected with the driving end of a micropower isolation power supply, and the output end of the transformer module is provided with a first output winding and a second output winding which have the same number of turns; the first input end and the second input end of the first isolation output module are respectively connected with the same-name end and the different-name end of the first output winding, the first input end and the second input end of the second isolation output module are respectively connected with the same-name end and the different-name end of the second output winding, and the output ends of the first isolation output module and the second isolation output module are respectively connected with the first load resistor and the second load resistor. The scheme can effectively reduce voltage fluctuation between reference grounds and avoid mutual interference between two paths of outputs.

Description

Dual-path isolation output rectifying circuit, interface circuit board and electrical equipment
Technical Field
The embodiment of the application relates to the technical field of bus communication, in particular to a double-path isolation output rectifying circuit, an interface circuit board and electrical equipment.
Background
In the fields of bus communication and data acquisition, a micropower isolation power supply is often required to be used for isolating an external interface, such as an CAN interface, an RS485 communication interface, a voltage acquisition interface and the like.
In some applications of the two-way interface, a voltage of two-way isolation is required, although the output power of the micro-power isolation power supply is lower, because of the existence of more long lines or large-area copper cladding in the PCB (Printed Circuit Board ), in the case of input sensitive devices such as CAN chips and other sensitive devices in a circuit, voltage fluctuation between the reference ground of two-way isolation output CAN be introduced into the input of the sensitive devices through the distribution parameters (such as equivalent capacitance and the like) of the PCB, so that signal input errors or anomalies are caused.
Disclosure of Invention
The embodiment of the application provides a double-path isolation output rectifying circuit, an interface circuit board and electrical equipment, which can effectively reduce voltage fluctuation between reference grounds and avoid mutual interference between two paths of outputs.
In a first aspect, an embodiment of the present application provides a two-way isolation output rectifying circuit, including a transformer module, a first isolation output module, and a second isolation output module;
the input end of the transformer module is connected with the driving end of the micropower isolation power supply, and the output end of the transformer module is provided with a first output winding and a second output winding which have the same number of turns;
the first input end of the first isolation output module is connected with the homonymous end of the first output winding, the second input end of the first isolation output module is connected with the heteronymous end of the first output winding, the first output end of the first isolation output module is connected with the first end of the first load resistor, and the second output end of the first isolation output module and the second end of the first load resistor are both connected with a first reference ground;
The first input end of the second isolation output module is connected with the homonymous end of the second output winding, the second input end of the second isolation output module is connected with the heteronymous end of the second output winding, the first output end of the second isolation output module and the first end of the second load resistor are both connected with a second reference ground, and the second output end of the second isolation output module is connected with the second end of the second load resistor.
In some embodiments, the first isolation output module includes a first rectifying diode, a first isolation capacitor and a second rectifying diode, an anode end of the first rectifying diode is connected to a homonymous end of the first output winding, a cathode end of the first rectifying diode and an anode end of the second rectifying diode are respectively connected to two ends of the first isolation capacitor, a cathode end of the second rectifying diode is connected to a heteronymous end of the first output winding, and a cathode end of the first rectifying diode and an anode end of the second rectifying diode are respectively used as a first output end and a second output end of the first isolation output module, and an end, connected to the anode end of the second rectifying diode, of the first isolation capacitor is the first reference ground.
In some embodiments, the second isolation output module includes a third rectifier diode, a second isolation capacitor and a fourth rectifier diode, a cathode end of the third rectifier diode is connected to a homonymous end of the second output winding, an anode end of the third rectifier diode and a cathode end of the fourth rectifier diode are respectively connected to two ends of the second isolation capacitor, an anode end of the fourth rectifier diode is connected to a synonym end of the second output winding, an anode end of the third rectifier diode and a cathode end of the fourth rectifier diode are respectively used as a first output end and a second output end of the second isolation output module, and an end, connected to the anode end of the third rectifier diode, of the second isolation capacitor is the second reference ground.
In some embodiments, the first isolated output module further includes a fifth rectifier diode and a sixth rectifier diode, a cathode terminal of the fifth rectifier diode is connected to a cathode terminal of the first rectifier diode, an anode terminal of the fifth rectifier diode is connected to a cathode terminal of the second rectifier diode, a cathode terminal of the sixth rectifier diode is connected to an anode terminal of the first rectifier diode, and an anode terminal of the sixth rectifier diode is connected to an anode terminal of the second rectifier diode.
In some embodiments, the second isolated output module further includes a seventh rectifier diode and an eighth rectifier diode, an anode terminal of the seventh rectifier diode is connected to an anode terminal of the third rectifier diode, a cathode terminal of the seventh rectifier diode is connected to an anode terminal of the fourth rectifier diode, an anode terminal of the eighth rectifier diode is connected to a cathode terminal of the third rectifier diode, and a cathode terminal of the eighth rectifier diode is connected to a cathode terminal of the fourth rectifier diode.
In some embodiments, when the micropower isolation output power supply is a full-bridge driving module, an input end of the transformer module is connected with a transformer driving output pin of a full-bridge driving chip of the full-bridge driving module.
In some embodiments, when the micropower isolation output power supply is a push-pull driving module, an input end of the transformer module is connected with a transformer driving output pin of a push-pull driving chip of the push-pull driving module.
In a second aspect, an embodiment of the present application further provides an interface circuit board, including a two-way isolation output rectifying circuit according to the embodiment of the first aspect.
In a third aspect, an embodiment of the present application further provides an electrical apparatus, including an interface circuit board according to an embodiment of the second aspect.
In some embodiments, the electrical device is an isolated CAN transceiver.
According to the embodiment of the application, the first isolation output module and the second isolation output module are respectively arranged on the two output windings at the output end of the transformer module, so that voltage fluctuation between the first reference ground and the second reference ground can be effectively reduced, and when a sensitive device sensitive to input exists in a circuit, interference such as input errors or abnormality of the sensitive device caused by voltage fluctuation between two paths of output is avoided, two paths of signals are effectively isolated, and the reliability of the whole circuit is improved.
Drawings
Fig. 1 is a schematic structural diagram of a two-way isolation output rectifying circuit according to an embodiment of the present application;
FIG. 2 is a schematic diagram of another dual-path isolated output rectifier circuit according to an embodiment of the present application;
FIG. 3 is an equivalent circuit diagram of the circuit of FIG. 1 incorporating distributed capacitance;
FIG. 4 is a schematic diagram of a dual-path isolated output rectifier circuit according to an embodiment of the present application;
FIG. 5 is an equivalent circuit diagram of the circuit of FIG. 1 when the circuit is connected to a sensitive device;
fig. 6 is a voltage waveform diagram before and after applying the dual-path isolation output rectifying circuit according to the embodiment of the present application.
Detailed Description
Embodiments of the present application will be described in further detail below with reference to the drawings and examples. It should be understood that the particular embodiments described herein are illustrative only and are not limiting of embodiments of the application. It should be further noted that, for convenience of description, only some, but not all of the structures related to the embodiments of the present application are shown in the drawings.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type, and are not limited to the number of objects, such as the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
Fig. 1 is a schematic structural diagram of a dual-path isolated rectifying output circuit according to an embodiment of the present application, as shown in fig. 1, a full-bridge driving module is used as a micropower isolated power source, the full-bridge driving module includes a full-bridge driving chip U1 and a third isolated capacitor C3, the third isolated capacitor C3 is connected to an enable terminal pin and a ground pin of the full-bridge driving chip U1, and the model of the full-bridge driving chip may be VPS8702. The two transformer driving output pins of the full-bridge driving chip U1 are connected with the input end of the transformer module 101, the transformer module 101 adopts a transformer T1 with a double-output winding structure, and the input winding T1-0 of the transformer module is connected with the two transformer driving output pins of the full-bridge driving chip U1.
The same-name end of the first output winding t1_1 of the transformer T1 is connected to the first input end of the first isolation output module 102, the different-name end of the first output winding t1_1 is connected to the second input end of the first isolation output module 102, the first output end and the second output end of the first isolation output module 102 are respectively connected to two ends of the first load resistor RL1, and the second output end of the first isolation output module 102 is connected to the first reference ground G1.
The first isolation output module 102 includes a first rectifying diode D1, a first isolation capacitor C1 and a second rectifying diode D2, where an anode end of the first rectifying diode D1 is connected to a homonymous end of the first output winding t1_1, a cathode end of the first rectifying diode D1 is connected to one end of the first isolation capacitor C1, an anode end of the second rectifying diode D2 is connected to the other end of the first isolation capacitor C1, and a cathode end of the second rectifying diode D2 is connected to a heteronymous end of the first output winding t1_1, so that the first isolation output capacitor C1 is connected in parallel with the first load resistor RL1, and two ends of the first isolation output capacitor C1 are respectively used as a first output end and a second output end of the first isolation output module 102, i.e., a cathode end of the first rectifying diode D1 and an anode end of the second rectifying diode D2 are respectively used as a first output end and a second output end of the first isolation output module 102.
The same-name end of the second output winding T1_2 of the transformer is connected with the first input end of the second isolation output module 103, the different-name end of the second output winding T1_2 is connected with the second input end of the second isolation output module 103, the first output end and the second output end of the second isolation output module 103 are respectively connected with two ends of the second load resistor RL2, and the first output end of the second isolation output module 103 is connected with the second reference ground G2.
The second isolation output module 103 includes a third rectifying diode D3, a second isolation capacitor C2 and a fourth rectifying diode D4, where a cathode end of the third rectifying diode D3 is connected to a homonymous end of the second output winding t1_2, an anode end of the third rectifying diode D3 is connected to one end of the second isolation capacitor C2, a cathode end of the fourth rectifying diode D4 is connected to the other end of the second isolation capacitor C2, and an anode end of the fourth rectifying diode D4 is connected to a heteronymous end of the second output winding t1_2, so that the second isolation output capacitor C2 is connected in parallel with the second load resistor RL2, and two ends of the second isolation output capacitor C2 are respectively used as a first output end and a second output end of the second isolation output module 103, that is, an anode end of the third rectifying diode D3 and a cathode end of the fourth rectifying diode D4 are respectively used as a first output end and a second output end of the second isolation output module 103.
It is contemplated that the first load resistor RL1 and the second load resistor RL2 are used to represent equivalent resistances of loads that access the two-way isolated output rectifying circuit, and that the first reference ground and the second reference ground represent reference grounds for voltages in the circuit. It should be noted that the micro-power isolation power supply may also be a push-pull driving module, for example, the push-pull driving module includes a push-pull driving chip with a model number VPS 8504B.
Fig. 2 is a schematic structural diagram of another two-way isolation output rectifying circuit provided in an embodiment of the present application, where a micro-power isolation power supply adopts a push-pull driving module, the push-pull driving module includes a push-pull driving chip U2 and a fourth isolation capacitor C4, the fourth isolation capacitor C4 is connected to an enable terminal pin and a ground terminal pin of the push-pull driving chip U2, two transformer driving pins of the push-pull driving chip U2 are connected to an input terminal of a transformer module 101, the transformer module 101 adopts a transformer T1 with a dual-input dual-output winding structure, a dual-input winding t1_0 is provided with two homonymous terminals, a first homonymous terminal of the winding t1_0 is connected to a transformer driving output pin of the push-pull driving chip U2, such as a VD1 pin, and a first homonymous terminal and a second homonymous terminal of the winding t1_0 are connected to a power input pin of the push-pull driving chip U2, such as a VD2 pin. And the first isolated output module 102 and the second isolated output module 103 connected to the first output winding t1_1 and the second output winding t1_2 of the transformer T1 are both configured as shown in fig. 1.
Fig. 3 is an equivalent circuit diagram of the circuit shown in fig. 1, in which distributed capacitances are introduced, as shown in fig. 3, because there are distributed capacitances between two output windings and between two reference grounds, it is understood that the distributed capacitances are equivalent capacitances, such as a first distributed capacitance Cw1 between the homonymous end of the first output winding t1_1 and the homonymous end of the second output winding t1_2, a second distributed capacitance Cw2 between the heteronymous end of the first output winding t1_1 and the heteronymous end of the second output winding t1_2, and a third distributed capacitance Cg between the first reference ground G1 and the second reference ground G2.
Taking the output of the transformer T1 as a positive period for illustration, in the output loop of the first output winding t1_1, that is, in the loop of the first output winding t1_1, the first rectifying diode D1, the first load resistor RL1, and the second rectifying diode D2, both the first rectifying diode D1 and the second rectifying diode D2 are in a conducting state; in the output loop of the second output winding t1_2, that is, in the loop of the second output winding t1_2, the third rectifier diode D3, the second load resistor RL2, and the fourth rectifier diode D4, the third rectifier diode D3 and the fourth rectifier diode D4 are in an off state, and the off voltage thereof is equal to the output voltage of the second output winding t1_2.
Therefore, in the loop of the first output winding t1_1, the first distributed capacitor Cw1, the third rectifying diode D3, the third distributed capacitor Cg and the second rectifying diode D2, the voltage of the third rectifying diode D3 counteracts the output voltage of the first output winding t1_1, so that the voltage across the third distributed capacitor Cg is 0, i.e. the voltage fluctuation between the reference grounds is 0.
Similarly, when the output of the transformer T1 is in the negative period, in the loop of the second output winding t1_2, the second distribution capacitor Cw2, the second rectifying diode D2, the third distribution capacitor Cg and the third rectifying diode D3, the voltage of the second rectifying diode D2 counteracts the output voltage of the second output winding t1_2, so that the voltage across the third distribution capacitor Cg is 0, that is, the voltage fluctuation between the reference grounds is 0.
Therefore, the output voltage of the output winding of the transformer is counteracted by the arrangement of the rectifier diode by the double-path isolation output circuit, so that the voltage between two reference grounds is 0, namely, the voltage fluctuation between the reference grounds is effectively reduced, the guarantee can be provided for the access of the sensitive device, the interference to the sensitive device is reduced, and the reliability of the whole circuit is improved.
In fig. 4, as shown in fig. 4, on the basis of the two-way isolation output rectifying circuit shown in fig. 1, a fifth rectifying diode D5 and a sixth rectifying diode D6 are further included in the first isolation output module 102, where the first rectifying diode D1, the second rectifying diode D2, the fifth rectifying diode D5 and the sixth rectifying diode D6 form a bridge rectifying structure, a cathode end of the fifth rectifying diode D5 is connected to a cathode end of the first rectifying diode D1, an anode end of the fifth rectifying diode D5 is connected to a cathode end of the second rectifying diode D2, an anode end of the sixth rectifying diode D6 is connected to an anode end of the second rectifying diode D2, and a cathode end of the sixth rectifying diode D6 is connected to an anode end of the first rectifying diode D1.
The second isolation output module further comprises a seventh rectifying diode D7 and an eighth rectifying diode D8, a bridge rectifying structure is formed among the third rectifying diode D3, the fourth rectifying diode D4, the seventh rectifying diode D7 and the eighth rectifying diode D8, an anode end of the seventh rectifying diode D7 is connected with an anode end of the third rectifying diode D3, a cathode end of the seventh rectifying diode D7 is connected with an anode end of the fourth rectifying diode D4, an anode end of the eighth rectifying diode D8 is connected with a cathode end of the third rectifying diode D3, and a cathode end of the eighth rectifying diode D8 is connected with a cathode end of the fourth rectifying diode D4.
The bridge rectifier structures are arranged on the two output windings, so that voltage fluctuation between two reference grounds can be reduced, guarantee can be provided for accessing the sensitive device, and interference to the sensitive device is reduced.
Fig. 5 is an equivalent circuit diagram of the circuit shown in fig. 1 when the circuit is connected to a sensing device, and the sensing device is illustratively a CAN chip, so that a capacitor Cch and a resistor Rch are a CAN pin input capacitor and an input resistor of the CAN chip, and the capacitor Cch and the resistor Rch are arranged in parallel.
As shown in the figure, in the equivalent circuit, a first end of a first distributed capacitor Cw1 is connected to a same-name end of a first output winding t1_1, a first end of a second distributed capacitor Cw2 is connected to a different-name end of a second output winding t1_2, the different-name end of the first output winding t1_1 is connected to a second end of the second distributed capacitor Cw2, the same-name end of the second output winding t1_2 is connected to a second end of the first distributed capacitor Cw1, a first end of a third distributed capacitor Cg is connected to a second distributed capacitor Cw2, a first end of the third distributed capacitor Cg is also connected to a first end of a capacitor Cch, an equivalent capacitor Cgh is connected to a second end of the third distributed capacitor Cg and a second end of the capacitor Cch, and the equivalent capacitor Cgh is an equivalent capacitor between a reference ground G2 and a CAN pin; VD2 represents the voltage value of the second rectifying diode D2, VD3 represents the voltage value of the third rectifying diode D3, and the voltages of the second rectifying diode D2 and the third rectifying diode D3 are applied between the second end of the first distributed capacitance Cw1 and the second end of the third distributed capacitance Cg.
Fig. 6 is a voltage waveform diagram before and after the application of the two-way isolation output rectifying circuit according to the embodiment of the present application. In the related art, the output winding of the transformer module is generally provided with a half-wave rectification structure, so fig. 6 (a) is a voltage waveform diagram when the circuit according to the embodiment of the present application is not adopted and is used for representing voltage waveforms of a plurality of detection points corresponding to the circuit structure adopted in the related art, fig. 6 (b) is a voltage waveform diagram of an equivalent circuit shown in fig. 5 and is used for representing voltage waveforms of a plurality of detection points adopting the circuit according to the embodiment of the present application, and fig. 6 (a) and 6 (b) both show voltage waveforms of the output voltage v1_1 of the first output winding t1_1, the voltage VG2 at two ends of the third distribution capacitor Cg and the pin voltage VCANH of the CAN chip.
The voltage of the CAN chip pin is related to the voltage across the third distributed capacitor, that is, VCANH is related to VG2, and when VG2 is larger, VCANH is larger, it is conceivable that the voltage is larger, with the peak-to-peak value of the voltage waveform as a reference, and the larger the peak-to-peak value is, the larger the fluctuation is.
As shown in fig. 6 (a), in the case of the circuit according to the embodiment of the present application, the voltage of v1_1 fluctuates between 5V and-5V, VG2 fluctuates between 2.6V and-2.6V, VCANH fluctuates between 1V and-1.2V, and the voltage waveform of VCANH is saw-tooth.
As shown in fig. 6 (b), when the circuit according to the embodiment of the present application is applied, and the voltage of v1_1 is the same, VG2 fluctuates between 0.1V and-0.1V, and VCANH fluctuates between 50mV and-50 mV.
It is conceivable that in practical application, due to the influence of factors such as circuit loss, the cut-off voltage of the third rectifier diode D3 and the fourth rectifier diode D4 will be slightly smaller than the output voltage of the second output winding t1_2, so that the voltage between the two reference grounds is slightly higher than 0V.
Therefore, after the interface circuit is applied to the design of the double-path isolation output rectifying circuit, when an input sensitive device such as a CAN chip is connected, the fluctuation between two reference grounds CAN be effectively reduced, the voltage fluctuation of a chip pin is reduced, the influence of the fluctuation between the reference grounds on the voltage of the chip pin is effectively eliminated, the influence on the total output power of the micropower isolation power supply is reduced, and the total output power of the isolation power supply is not influenced.
The embodiment of the application also provides an interface circuit board, which comprises the double-path isolation output rectifying circuit, namely the double-path isolation output rectifying circuit CAN be integrated on the interface circuit board, when an input sensitive device such as a CAN chip is connected to the interface circuit board, the interface circuit board CAN effectively reduce interference, so that the interference is difficult to influence the input of the sensitive device, the voltage fluctuation of a chip pin is reduced, the total output power of a micropower isolation power supply CAN be kept stable, and meanwhile, the total output power of the isolation power supply cannot be influenced.
The embodiment of the application also provides an electrical device which comprises the interface circuit board described in the embodiment, wherein the electrical device CAN be an isolated CAN transceiver, an isolated RS-485 transceiver and the like.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
Note that the above is only a preferred embodiment of the present application and the technical principle applied. It will be understood by those skilled in the art that the present application is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the application. Therefore, while the application has been described in connection with the above embodiments, the application is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the application, which is set forth in the following claims.

Claims (8)

1. A two-way isolated output rectifier circuit, comprising:
The input end of the transformer module is connected with the driving end of the micropower isolation power supply, and the output end of the transformer module is provided with a first output winding and a second output winding with the same number of turns;
The first output end of the first isolation output module is connected with the first end of the first load resistor, and the second output end of the first isolation output module and the second end of the first load resistor are both connected with a first reference ground;
The first isolation output module comprises a first rectifying diode, a first isolation capacitor and a second rectifying diode, wherein the anode end of the first rectifying diode is connected with the homonymous end of the first output winding, the cathode end of the first rectifying diode and the anode end of the second rectifying diode are respectively connected with the two ends of the first isolation capacitor, the cathode end of the second rectifying diode is connected with the synonym end of the first output winding, and the cathode end of the first rectifying diode and the anode end of the second rectifying diode are respectively used as the first output end and the second output end of the first isolation output module;
The first input end of the second isolation output module is connected with the same-name end of the second output winding, the second input end of the second isolation output module is connected with the different-name end of the second output winding, the first output end of the second isolation output module and the first end of the second load resistor are both connected with a second reference ground, and the second output end of the second isolation output module is connected with the second end of the second load resistor;
The second isolation output module comprises a third rectifier diode, a second isolation capacitor and a fourth rectifier diode, wherein the cathode end of the third rectifier diode is connected with the homonymous end of the second output winding, the anode end of the third rectifier diode and the cathode end of the fourth rectifier diode are respectively connected with the two ends of the second isolation capacitor, the anode end of the fourth rectifier diode is connected with the synonym end of the second output winding, and the anode end of the third rectifier diode and the cathode end of the fourth rectifier diode are respectively used as the first output end and the second output end of the second isolation output module;
A first distributed capacitor is arranged between the homonymous end of the first output winding and the homonymous end of the second output winding, a second distributed capacitor is arranged between the heteronymous end of the first output winding and the heteronymous end of the second output winding, and a third distributed capacitor is arranged between the first reference ground and the second reference ground;
when the output of the transformer is in a positive period, in the first output winding, the first distributed capacitor, the third rectifier diode, the third distributed capacitor and the second rectifier diode loop, the voltage of the third rectifier diode counteracts the output voltage of the first output winding, and the voltage at two ends of the third distributed capacitor is 0, so that the voltage fluctuation between the first reference ground and the second reference ground is 0;
When the output of the transformer is in a negative period, the voltage of the second rectifying diode counteracts the output voltage of the second output winding in the second output winding, the second distributing capacitor, the second rectifying diode, the third distributing capacitor and the third rectifying diode loop, and the voltage at two ends of the third distributing capacitor is 0, so that the voltage fluctuation between the first reference ground and the second reference ground is 0.
2. The two-way isolation output rectifying circuit of claim 1, wherein the first isolation output module further comprises a fifth rectifying diode and a sixth rectifying diode, wherein a cathode terminal of the fifth rectifying diode is connected to a cathode terminal of the first rectifying diode, an anode terminal of the fifth rectifying diode is connected to a cathode terminal of the second rectifying diode, a cathode terminal of the sixth rectifying diode is connected to an anode terminal of the first rectifying diode, and an anode terminal of the sixth rectifying diode is connected to an anode terminal of the second rectifying diode.
3. The two-way isolation output rectifying circuit of claim 1, wherein the second isolation output module further comprises a seventh rectifying diode and an eighth rectifying diode, an anode terminal of the seventh rectifying diode is connected to an anode terminal of the third rectifying diode, a cathode terminal of the seventh rectifying diode is connected to an anode terminal of the fourth rectifying diode, an anode terminal of the eighth rectifying diode is connected to a cathode terminal of the third rectifying diode, and a cathode terminal of the eighth rectifying diode is connected to a cathode terminal of the fourth rectifying diode.
4. The two-way isolation output rectifier circuit of claim 1, wherein when the micropower isolation output power source is a full-bridge drive module, an input end of the transformer module is connected to a transformer drive output pin of a full-bridge drive chip of the full-bridge drive module.
5. The two-way isolation output rectifying circuit of claim 4, wherein when the micropower isolation output power supply is a push-pull driving module, an input end of the transformer module is connected with a transformer driving output pin of a push-pull driving chip of the push-pull driving module.
6. An interface circuit board comprising a two-way isolated output rectifier circuit according to any one of claims 1-5.
7. An electrical device comprising the interface circuit board of claim 6.
8. The electrical device of claim 7, wherein the electrical device is an isolated CAN transceiver.
CN202210593545.2A 2022-05-27 2022-05-27 Dual-path isolation output rectifying circuit, interface circuit board and electrical equipment Active CN115065421B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210593545.2A CN115065421B (en) 2022-05-27 2022-05-27 Dual-path isolation output rectifying circuit, interface circuit board and electrical equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210593545.2A CN115065421B (en) 2022-05-27 2022-05-27 Dual-path isolation output rectifying circuit, interface circuit board and electrical equipment

Publications (2)

Publication Number Publication Date
CN115065421A CN115065421A (en) 2022-09-16
CN115065421B true CN115065421B (en) 2024-05-17

Family

ID=83199361

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210593545.2A Active CN115065421B (en) 2022-05-27 2022-05-27 Dual-path isolation output rectifying circuit, interface circuit board and electrical equipment

Country Status (1)

Country Link
CN (1) CN115065421B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN206294081U (en) * 2016-11-15 2017-06-30 惠州市蓝微新源技术有限公司 A kind of BMS insulating power supplies circuit
CN107395022A (en) * 2017-07-25 2017-11-24 杭州士兰微电子股份有限公司 Mode of resonance switch converters and its control method
CN212627692U (en) * 2020-08-16 2021-02-26 苏州源特半导体科技有限公司 Multi-output isolation non-stabilized voltage power supply circuit based on isolation transformer
CN212726860U (en) * 2020-08-16 2021-03-16 苏州源特半导体科技有限公司 Power supply circuit based on isolation transformer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN206294081U (en) * 2016-11-15 2017-06-30 惠州市蓝微新源技术有限公司 A kind of BMS insulating power supplies circuit
CN107395022A (en) * 2017-07-25 2017-11-24 杭州士兰微电子股份有限公司 Mode of resonance switch converters and its control method
CN212627692U (en) * 2020-08-16 2021-02-26 苏州源特半导体科技有限公司 Multi-output isolation non-stabilized voltage power supply circuit based on isolation transformer
CN212726860U (en) * 2020-08-16 2021-03-16 苏州源特半导体科技有限公司 Power supply circuit based on isolation transformer

Also Published As

Publication number Publication date
CN115065421A (en) 2022-09-16

Similar Documents

Publication Publication Date Title
US9726697B2 (en) Coupled inductor current sensing apparatus and systems
CN101924464B (en) Component fault detection for use with a multi-phase DC-DC converter
CN103066851B (en) Control circuit for primary side flyback type converter
CN1938734A (en) Two wire transmitter with isolated can output
US20140268464A1 (en) Output over-voltage protection circuit for power factor correction
CN101253674A (en) Charge pump circuit for rfid integrated circuits
CN109061272A (en) A kind of current detection circuit
CN101614761B (en) Current-sensing circuit
CN104242630A (en) Power supply apparatus
CN108809086A (en) Voltage generation circuit
CN115065421B (en) Dual-path isolation output rectifying circuit, interface circuit board and electrical equipment
CN107046368B (en) Power supply change-over device
CN204119024U (en) A kind of voltage signal conditioning circuit based on TL431
US7696794B2 (en) Drive circuit for a switch in a switching converter
CN115963888A (en) Constant current control device and constant current control method
KR102170996B1 (en) Power blackout sensing system with a phantom voltage detector
CN112671236B (en) Voltage conversion circuit and display device
CN103869853A (en) Voltage regulation integrated circuit, voltage regulation circuit and voltage regulation method
CN103299527A (en) Switching power supply circuit
CN206673849U (en) The high-performance electric source module that nuclear power station reactor core Nuclear measurement system uses
CN101562426A (en) Power amplification circuit
CN110865232A (en) Isolated power grid voltage sampling device with temperature compensation and sampling method
CN115033043B (en) Testing device of low-dropout linear voltage regulator
CN215931999U (en) Digital display high-precision voltage and current detection circuit
CN211670640U (en) Power supply circuit and electronic equipment

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
CB02 Change of applicant information

Address after: 510000 room 306, 3rd floor, 43 Sicheng Road, software park, Tianhe District, Guangzhou City, Guangdong Province

Applicant after: GUANGZHOU ZHIYUAN ELECTRONICS Co.,Ltd.

Address before: 510000 room 306, 3rd floor, 43 Sicheng Road, software park, Tianhe District, Guangzhou City, Guangdong Province

Applicant before: GUANGZHOU ZHIYUAN ELECTRONICS Co.,Ltd.

CB02 Change of applicant information
GR01 Patent grant
GR01 Patent grant