CN115065421A - Double-path isolation output rectifying circuit, interface circuit board and electrical equipment - Google Patents

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

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Publication number
CN115065421A
CN115065421A CN202210593545.2A CN202210593545A CN115065421A CN 115065421 A CN115065421 A CN 115065421A CN 202210593545 A CN202210593545 A CN 202210593545A CN 115065421 A CN115065421 A CN 115065421A
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China
Prior art keywords
output
isolation
terminal
diode
module
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CN202210593545.2A
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Chinese (zh)
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CN115065421B (en
Inventor
周立功
郑暖
耿陈毅
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Guangzhou Zhiyuan Electronics Co Ltd
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Guangzhou Zhiyuan Electronics Co Ltd
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    • 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

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  • 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 drive 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 homonymous end and the synonym 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 homonymous end and the synonym 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

Double-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 field of bus communication and data acquisition, a micropower isolation power supply is often needed for realizing isolation of external interfaces, such as CAN interfaces, RS485 communication interfaces, voltage acquisition interfaces and the like.
In some applications of the two-way interface, a two-way isolated voltage is required, and although the output power of the micropower isolation power supply is low, because a Printed Circuit Board (PCB) has more long lines or large-area copper clad, under the condition that an input sensitive device such as a CAN chip exists in a Circuit, voltage fluctuation between reference grounds of two-way isolated output is introduced into the input of the sensitive device through distribution parameters (such as equivalent capacitance and the like) of the PCB, so that signal input errors or abnormalities of the sensitive device 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 isolated output rectification circuit, including a transformer module, a first isolated output module, and a second isolated output module;
the input end of the transformer module is connected with the drive 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;
a first input end of the first isolation output module is connected with a homonymous end of the first output winding, a second input end of the first isolation output module is connected with a heteronymous end of the first output winding, a first output end of the first isolation output module is connected with a first end of a first load resistor, and a second output end of the first isolation output module and a 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 terminal of the first rectifying diode is connected to the homonymous terminal of the first output winding, a cathode terminal of the first rectifying diode and an anode terminal of the second rectifying diode are respectively connected to two terminals of the first isolation capacitor, a cathode terminal of the second rectifying diode is connected to the synonym terminal of the first output winding, the cathode terminal of the first rectifying diode and the anode terminal of the second rectifying diode are respectively used as the first output terminal and the second output terminal of the first isolation output module, and a terminal of the first isolation capacitor connected to the anode terminal of the second rectifying diode is the first reference ground.
In some embodiments, the second isolation output module includes a third rectifying diode, a second isolation capacitor and a fourth rectifying diode, a cathode terminal of the third rectifying diode is connected to the dotted terminal of the second output winding, an anode terminal of the third rectifying diode and a cathode terminal of the fourth rectifying diode are respectively connected to two terminals of the second isolation capacitor, an anode terminal of the fourth rectifying diode is connected to the dotted terminal of the second output winding, an anode terminal of the third rectifying diode and a cathode terminal of the fourth rectifying diode are respectively used as the first output terminal and the second output terminal of the second isolation output module, and a terminal of the second isolation capacitor connected to an anode terminal of the third rectifying diode is the second reference ground.
In some embodiments, the first isolated output module further includes a fifth rectifying diode and a sixth rectifying diode, a cathode terminal of the fifth rectifying diode is connected to the cathode terminal of the first rectifying diode, an anode terminal of the fifth rectifying diode is connected to the cathode terminal of the second rectifying diode, a cathode terminal of the sixth rectifying diode is connected to the anode terminal of the first rectifying diode, and an anode terminal of the sixth rectifying diode is connected to the anode terminal of the second rectifying diode.
In some embodiments, the second isolated output module further includes 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.
In some embodiments, when the micro-power isolated output power source is a full-bridge driving module, the input terminal of the transformer module is connected to a transformer driving output pin of a full-bridge driving chip of the full-bridge driving module.
In some embodiments, when the micro-power isolated output power supply is a push-pull driving module, the input terminal of the transformer module is connected to 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, which includes the dual-path isolated output rectification circuit described in the embodiment of the first aspect.
In a third aspect, an embodiment of the present application further provides an electrical device, which includes the interface circuit board according to the 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 of the output end of the transformer module, voltage fluctuation between the first reference ground and the second reference ground can be effectively reduced, and when a sensitive device is input in a circuit, interference such as input error or abnormity of the sensitive device caused by voltage fluctuation between two paths of output is avoided, so that 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 isolated output rectification circuit according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of another two-way isolation output rectification 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 structural diagram of another two-way isolated output rectification circuit provided in the embodiment of the present application;
FIG. 5 is an equivalent circuit diagram of the circuit of FIG. 1 when coupled to a sensitive device;
fig. 6 is a voltage waveform diagram before and after applying a dual-path isolation output rectification circuit according to an embodiment of the present application.
Detailed Description
The embodiments of the present application will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad embodiments of the present application. It should be further noted that, for convenience of description, only some structures related to the embodiments of the present application are shown in the drawings, not all of the structures are shown.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
Fig. 1 is a schematic structural diagram of a two-way isolation rectification output circuit provided in an embodiment of the present application, as shown in fig. 1, a full-bridge driving module is used as a micro-power isolation power supply, the full-bridge driving module includes a full-bridge driving chip U1 and a third isolation capacitor C3, the third isolation 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 VPS 8702. Two transformer driving output pins of the full-bridge driving chip U1 are connected to the input end of the transformer module 101, the transformer module 101 adopts a transformer T1 with a dual-output winding structure, and the input winding T1_0 of the transformer module is connected to two transformer driving output pins of the full-bridge driving chip U1.
The dotted terminal of the first output winding T1_1 of the transformer T1 is connected to the first input terminal of the first isolation output module 102, the different-dotted terminal of the first output winding T1_1 is connected to the second input terminal of the first isolation output module 102, the first output terminal and the second output terminal of the first isolation output module 102 are respectively connected to two terminals of the first load resistor RL1, and the second output terminal of the first isolation output module 102 is connected to the first reference ground G1.
The first isolated output module 102 includes a first rectifying diode D1, a first isolating capacitor C1 and a second rectifying diode D2, an anode terminal of the first rectifying diode D1 is connected to the dotted terminal of the first output winding T1_1, a cathode terminal of the first rectifying diode D1 is connected to one terminal of the first isolating capacitor C1, an anode terminal of the second rectifying diode D2 is connected to the other terminal of the first isolating capacitor C1, and the cathode terminal of the second rectifying diode D2 is connected to the synonym terminal of the first output winding T1_1, therefore, the first isolated output capacitor C1 is connected in parallel with the first load resistor RL1, and two ends of the first isolated output capacitor C1 are respectively used as the first output end and the second output end of the first isolated output module 102, namely, the cathode terminal of the first rectifying diode D1 and the anode terminal of the second rectifying diode D2 serve as the first output terminal and the second output terminal of the first isolated output module 102, respectively.
The dotted terminal of the second output winding T1_2 of the transformer is connected to the first input terminal of the second isolation output module 103, the different-dotted terminal of the second output winding T1_2 is connected to the second input terminal of the second isolation output module 103, the first output terminal and the second output terminal of the second isolation output module 103 are respectively connected to two terminals of the second load resistor RL2, and the first output terminal of the second isolation output module 103 is connected to the second reference ground G2.
The second isolation output module 103 comprises a third rectifying diode D3, a second isolation capacitor C2 and a fourth rectifying diode D4, wherein the cathode terminal of the third rectifying diode D3 is connected with the dotted terminal of the second output winding T1_2, the anode terminal of the third rectifying diode D3 is connected with one end of the second isolation capacitor C2, the cathode terminal of the fourth rectifying diode D4 is connected with the other end of the second isolation capacitor C2, the anode terminal of the fourth rectifying diode D4 is connected with the dotted terminal of the second output winding T1_2, therefore, the second isolated output capacitor C2 is connected in parallel with the second load resistor RL2, and two ends of the second isolated output capacitor C2 are respectively used as the first output end and the second output end of the second isolated output module 103, that is, the anode terminal of the third rectifying diode D3 and the cathode terminal of the fourth rectifying diode D4 serve as the first output terminal and the second output terminal of the second isolated output module 103, respectively.
It is contemplated that the first load resistance RL1 and the second load resistance RL2 are used to represent the equivalent resistance of a load connected into the dual isolated output rectification circuit, and the first ground reference and the second ground reference represent ground reference terminals of the voltage in the circuit. It should be noted that the micropower isolation power supply may also be a push-pull driving module, for example, the push-pull driving module includes a push-pull driving chip of model VPS 8504B.
Fig. 2 is a schematic structural diagram of another two-way isolated output rectification circuit provided in this embodiment of the present application, wherein a micro power isolated power supply employs a push-pull driving module, the push-pull driving module includes a push-pull driving chip U2 and a fourth isolating capacitor C4, the fourth isolating capacitor C4 is connected to an enable pin and a ground pin of the push-pull driving chip U2, two transformer driving pins of the push-pull driving chip U2 are connected to input terminals of a transformer module 101, the transformer module 101 employs a transformer T1 with a dual-input dual-output winding structure, a dual-input winding T1_0 of which is provided with two dotted terminals, a first dotted terminal of the winding T1_0 is connected to one transformer driving output pin of the push-pull driving chip U2, such as a VD1 pin, and a first dotted terminal and a second dotted terminal of the winding T1_0 are connected to a power input pin of the driving chip U2, such as a VIN pin, a second dotted terminal of the push-pull driving chip T1_0 is connected to another transformer driving output pin of the push-pull driving chip U2, such as VD2 pin. And the first and second isolated output modules 102 and 103 connected to the first and second output windings T1_1 and T1_2 of the transformer T1 are configured as shown in fig. 1.
Fig. 3 is an equivalent circuit diagram of the circuit shown in fig. 1, which introduces distributed capacitance, and as shown in fig. 3, since distributed capacitance exists between both output windings and between two reference grounds, it can be understood that distributed capacitance is equivalent capacitance, such as a first distributed capacitance Cw1 existing between the dotted terminal of the first output winding T1_1 and the dotted terminal of the second output winding T1_2, a second distributed capacitance Cw2 existing between the dotted terminal of the first output winding T1_1 and the dotted terminal of the second output winding T1_2, and a third distributed capacitance Cg existing between the first reference ground G1 and the second reference ground G2.
Taking the positive cycle of the output of the transformer T1 as an example, in the output loop of the first output winding T1_1, i.e., in the loop of the first output winding T1_1, the first rectifier diode D1, the first load resistor RL1 and the second rectifier diode D2, both the first rectifier diode D1 and the second rectifier diode D2 are in a conducting state; in the output circuit of the second output winding T1_2, that is, in the circuit of the second output winding T1_2, the third rectifier diode D3, the second load resistor RL2, and the fourth rectifier diode D4, both the third rectifier diode D3 and the fourth rectifier diode D4 are in the 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 cancels 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 rectifier diode D2, the third distribution capacitor Cg and the third rectifier diode D3, the voltage of the second rectifier diode D2 cancels 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 double-path isolation output circuit cancels the output voltage of the output winding of the transformer through the arrangement of the rectifier diode, so that the voltage between the two reference grounds is 0, namely, the voltage fluctuation between the two reference grounds is effectively reduced, the guarantee can be provided when a sensitive device is connected, the interference to the sensitive device is reduced, and the reliability of the whole circuit is improved.
Fig. 4 is a schematic structural diagram of a dual-path isolated output rectifier circuit provided in the embodiment of the present application, as shown in fig. 4, on the basis of the dual-path isolated output rectifier circuit shown in fig. 1, the first isolated output module 102 further includes a fifth rectifier diode D5 and a sixth rectifier diode D6, the first rectifier diode D1, the second rectifier diode D2, the fifth rectifier diode D5 and the sixth rectifier diode D6 form a bridge rectifier structure, a cathode terminal of the fifth rectifier diode D5 is connected to a cathode terminal of the first rectifier diode D1, an anode terminal of the fifth rectifier diode D5 is connected to a cathode terminal of the second rectifier diode D2, an anode terminal of the sixth rectifier diode D6 is connected to an anode terminal of the second rectifier diode D2, and a cathode terminal of the sixth rectifier diode D6 is connected to an anode terminal of the first rectifier diode D1.
The second isolated output module further includes 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 terminal of the seventh rectifying diode D7 is connected to an anode terminal of the third rectifying diode D3, a cathode terminal of the seventh rectifying diode D7 is connected to an anode terminal of the fourth rectifying diode D4, an anode terminal of the eighth rectifying diode D8 is connected to a cathode terminal of the third rectifying diode D3, and a cathode terminal of the eighth rectifying diode D8 is connected to a cathode terminal of the fourth rectifying diode D4.
The bridge rectifier structures are arranged on the two output windings, so that voltage fluctuation between the two reference grounds can be reduced, guarantee can be provided for access of sensitive devices, and interference on the sensitive devices is reduced.
Fig. 5 is an equivalent circuit diagram of the circuit shown in fig. 1 when a sensitive device is connected, for example, the connected sensitive device is a CAN chip, and therefore, the capacitor Cch and the resistor Rch are an input capacitor and an input resistor of a CAN pin 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 the first distributed capacitor Cw1 is connected to a dotted end of the first output winding T1_1, a first end of the second distributed capacitor Cw2 is connected to a dotted end of the second output winding T1_2, a dotted end of the first output winding T1_1 is connected to a second end of the second distributed capacitor Cw2, a dotted end of the second output winding T1_2 is connected to a second end of the first distributed capacitor Cw1, a first end of the third distributed capacitor Cg is connected to the second distributed capacitor Cw2, a first end of the third distributed capacitor Cg is further connected to a first end of a capacitor Cch, the 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 the reference ground G2 and the CAN pin; VD2 denotes a voltage value of the second rectifying diode D2, VD3 denotes a voltage value of the third rectifying diode D3, and voltages of the second rectifying diode D2 and the third rectifying diode D3 are applied between the second terminal of the first distribution capacitor Cw1 and the second terminal of the third distribution capacitor Cg.
Fig. 6 is a voltage waveform diagram before and after a dual-path isolation output rectification circuit is applied according to the embodiment of the present application. In the related art, the output winding of the transformer module is usually provided with a half-wave rectification structure, and therefore, fig. 6(a) is a voltage waveform diagram when the CAN chip is connected without using the circuit described in the embodiment of the present application, and is used to show voltage waveforms at a plurality of detection points corresponding to the circuit structure used in the related art, fig. 6(b) is a voltage waveform diagram of an equivalent circuit shown in fig. 5, and is used to show voltage waveforms at a plurality of detection points of the circuit described in the embodiment of the present application, and fig. 6(a) and fig. 6(b) each show a voltage waveform of an output voltage VT1_1 of the first output winding T1_1, a voltage VG2 at two ends of the third distribution capacitor Cg, and a pin voltage VCANH of the CAN chip.
The voltage of the pin of the CAN chip is related to the voltage across the third distribution capacitor, that is, the fluctuation of VCANH is related to VG2, when the fluctuation of VG2 is larger, the fluctuation of VCANH is larger, it is conceivable that the fluctuation of voltage CAN be referred to by the peak-to-peak value of the voltage waveform, and the larger the peak-to-peak value is, the larger the fluctuation is.
As shown in FIG. 6(a), without the circuit of the embodiment of the present application, the voltage of VT1_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-toothed.
As shown in FIG. 6(b), when the circuit of the embodiment of the present application is applied and the voltage of VT1_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 applications, due to circuit loss and other factors, the cut-off voltages of the third rectifying diode D3 and the fourth rectifying diode D4 are 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 design of the double-path isolation output rectifying circuit is applied to the interface circuit, when a sensitive input device such as a CAN chip is connected, the fluctuation between two reference grounds CAN be effectively reduced, the voltage fluctuation of chip pins is reduced, the influence of the fluctuation between the reference grounds on the voltage of the chip pins 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 rectification circuit, namely, the double-path isolation output rectification circuit CAN be integrated on the interface circuit board, when the interface circuit board is connected with a sensitive input device such as a CAN chip, the interference CAN be effectively reduced, so that the interference is difficult to influence the input of the sensitive device, the voltage fluctuation of chip pins is reduced, the total output power of the micropower isolation power supply CAN be kept stable, and the total output power of the isolation power supply CAN not be influenced.
The embodiment of the application also provides electrical equipment, which comprises the interface circuit board, and the electrical equipment 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 an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present application and the technical principles employed. 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, although the present application has been described in more detail with reference to the above embodiments, the present application is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims (10)

1. A dual path 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 which have the same number of turns;
a first input end of the first isolation output module is connected with a homonymous end of the first output winding, a second input end of the first isolation output module is connected with a heteronymous end of the first output winding, a first output end of the first isolation output module is connected with a first end of a first load resistor, and a second output end of the first isolation output module and a 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.
2. The dual-path isolation output rectification circuit according to claim 1, wherein the first isolation output module comprises a first rectifying diode, a first isolation capacitor and a second rectifying diode, an anode terminal of the first rectifying diode is connected to a dotted terminal of the first output winding, a cathode terminal of the first rectifying diode and an anode terminal of the second rectifying diode are respectively connected to two terminals of the first isolation capacitor, a cathode terminal of the second rectifying diode is connected to a dotted terminal of the first output winding, and the cathode terminal of the first rectifying diode and the anode terminal of the second rectifying diode are respectively used as a first output terminal and a second output terminal of the first isolation output module.
3. The dual-path isolation output rectification circuit according to claim 1 or 2, wherein the second isolation output module comprises a third rectifying diode, a second isolation capacitor and a fourth rectifying diode, a cathode terminal of the third rectifying diode is connected to the dotted terminal of the second output winding, an anode terminal of the third rectifying diode and a cathode terminal of the fourth rectifying diode are respectively connected to two terminals of the second isolation capacitor, an anode terminal of the fourth rectifying diode is connected to the dotted terminal of the second output winding, and an anode terminal of the third rectifying diode and a cathode terminal of the fourth rectifying diode are respectively used as the first output terminal and the second output terminal of the second isolation output module.
4. The dual-path isolation output rectification circuit of claim 2, wherein the first isolation output module further comprises a fifth rectification diode and a sixth rectification diode, a cathode terminal of the fifth rectification diode is connected to a cathode terminal of the first rectification diode, an anode terminal of the fifth rectification diode is connected to a cathode terminal of the second rectification diode, a cathode terminal of the sixth rectification diode is connected to an anode terminal of the first rectification diode, and an anode terminal of the sixth rectification diode is connected to an anode terminal of the second rectification diode.
5. The dual-path isolation output rectification circuit of claim 3, wherein the second isolation output module further comprises a seventh rectification diode and an eighth rectification diode, an anode terminal of the seventh rectification diode is connected with an anode terminal of the third rectification diode, a cathode terminal of the seventh rectification diode is connected with an anode terminal of the fourth rectification diode, an anode terminal of the eighth rectification diode is connected with a cathode terminal of the third rectification diode, and a cathode terminal of the eighth rectification diode is connected with a cathode terminal of the fourth rectification diode.
6. The dual-path isolated output rectification circuit of claim 1, wherein when the micro-power isolated output power source is a full-bridge driving module, the input terminal of the transformer module is connected to the transformer driving output pin of the full-bridge driving chip of the full-bridge driving module.
7. The dual-path isolation output rectification circuit according to claim 6, wherein when the micro-power isolation output power supply is a push-pull driving module, the input end of the transformer module is connected to a transformer driving output pin of a push-pull driving chip of the push-pull driving module.
8. An interface circuit board comprising a two-way isolated output rectification circuit according to any one of claims 1-7.
9. An electrical apparatus comprising the interface board of claim 8.
10. The electrical device of claim 9, wherein the electrical device is an isolated CAN transceiver.
CN202210593545.2A 2022-05-27 Dual-path isolation output rectifying circuit, interface circuit board and electrical equipment Active CN115065421B (en)

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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

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