CN220368604U - Redundant circuit based on ideal diode - Google Patents
Redundant circuit based on ideal diode Download PDFInfo
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- CN220368604U CN220368604U CN202321817763.6U CN202321817763U CN220368604U CN 220368604 U CN220368604 U CN 220368604U CN 202321817763 U CN202321817763 U CN 202321817763U CN 220368604 U CN220368604 U CN 220368604U
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Abstract
The utility model discloses an ideal diode-based redundant circuit, which comprises a two-path DC-DC converter output voltage regulating circuit and a two-path ideal diode driver N3. The utility model can control the MOS tube voltage drop through the two-way ideal diode driver N3 under the condition of two-way output redundancy so as to ensure smooth current conversion from one channel to the other channel and no oscillation; if a certain power supply fails or is in short circuit, the two-way ideal diode driver chip can rapidly turn off the MOS tube, so that instantaneous reverse current can be reduced to the maximum extent; and the fault of one path of output DC-DC converter does not affect the regulation of the output voltage of the other path of DC-DC converter.
Description
Technical Field
The utility model relates to the technical field of circuit design, in particular to a redundant circuit based on an ideal diode.
Background
In the power supply design, in order to improve the safety and reliability of the system, two output redundancy is often required to be designed, namely at least one additional power supply is added in the system, and when one power supply fails, the other power supplies can provide electric energy for the system. Therefore, the fault of the DC-DC converter of one path of output cannot affect the regulation of the output voltage of the other path of DC-DC converter.
In the past, the power redundancy is realized by a diode mode, and two paths of power supplies are connected to a common point of a load through diode output, so as to prevent faults such as short circuit of an input power supply and the like of the system. Since the diode only allows current to flow in a single direction, the diode can achieve fault isolation of the redundant bus, thereby allowing the system to remain operational using the remaining power supply. However, when the conventional diode is used, the diode is always in a forward conduction state, and the inherent conduction voltage drop of the diode causes the problems of serious heat generation and serious power loss in high-power application occasions, so that potential safety hazards and resource waste are caused. Because the same function output of the power modules can affect the service life of the redundant power modules, and all power supply modules can be involved when the load end is short-circuited.
The other power redundancy backup means that the power module is composed of a plurality of modules with the same function, and is powered by one of the modules in normal time, when the power module fails, the backup module is started and put into operation, and the disadvantage of the mode is that the power switching has a time interval, and the working voltage can drop first and then rise in the time interval, so that voltage gaps are easily caused, and the control chip at the later stage can cause external load restart due to instantaneous power failure. In addition, the redundancy scheme can generate voltage changes with different amplitude values in the switching process of the main power supply and the standby power supply or generate surges at the switching moment, so that the external load performance is influenced.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide a redundant circuit based on an ideal diode, which ensures the stability of voltage after redundancy.
The technical scheme adopted by the utility model is as follows:
the redundant circuit based on the ideal diode comprises a two-way DC-DC converter output voltage regulating circuit and a two-way ideal diode driver N3;
the first path of DC-DC converter output voltage regulating circuit comprises a DC-DC converter N1, a common mode inductor L1, a resistor R1, a capacitor C2, a MOS tube M1 and a voltage stabilizing diode V1; the positive input end +VI and the negative input end-VI of the DC-DC converter N1 are respectively connected with the positive end and the negative end of the DC voltage, the positive output end +VO and the +S end of the DC-DC converter N1 are connected with the first input end of the common-mode inductor L1, and the negative output end-VO and the-S end are connected with the second input end of the common-mode inductor L1; the resistor R1 is connected between the TRIM terminal and the-S terminal of the DC-DC converter N1; two ends of a capacitor C1 are connected between two input ends of the common-mode inductor L1, and two ends of a capacitor C2 are connected between two output ends of the common-mode inductor L1; the first output end of the common-mode inductor L1, the source electrode of the MOS tube M1 and the positive electrode of the voltage stabilizing diode V1 are connected and then connected to the IN1 end of the double-path ideal diode driver N3; the grid electrode of the MOS tube M1 is connected with the cathode of the voltage stabilizing diode V1 and then connected with the GATE1 end of the double-path ideal diode driver N3, and the drain electrode of the MOS tube M1 is connected with the direct-current output port +OUT; the second output end of the common mode inductor L1 is connected with a direct current output port-OUT;
the second path of DC-DC converter output voltage regulating circuit comprises a DC-DC converter N2, a common mode inductor L2, a resistor R2, a capacitor C3, a capacitor C4, a MOS tube M2 and a voltage stabilizing diode V2; the positive input end +VI and the negative input end-VI of the DC-DC converter N2 are respectively connected with the positive end and the negative end of the DC voltage, the positive output end +VO and the +S end of the DC-DC converter N2 are connected with the first input end of the common-mode inductor L2, and the negative output end-VO and the-S end are connected with the second input end of the common-mode inductor L2; the resistor R2 is connected between the TRIM terminal and the-S terminal of the DC-DC converter N2; two ends of a capacitor C3 are connected between two input ends of the common-mode inductor L2, and two ends of a capacitor C4 are connected between two output ends of the common-mode inductor L2; the first output end of the common-mode inductor L2, the source electrode of the MOS tube M2 and the positive electrode of the voltage stabilizing diode V2 are connected and then connected to the IN2 end of the double-path ideal diode driver N3; the grid electrode of the MOS tube M2 is connected with the cathode of the voltage stabilizing diode V2 and then connected with the GATE2 end of the double-path ideal diode driver N3, and the drain electrode of the MOS tube M2 is connected with the direct-current output port +OUT; the second output terminal of the common-mode inductance L2 is connected to the dc output port-OUT.
Specifically, the terminals fuserft 1 and fuserft 2 of the two-way ideal diode driver N3 are indication terminals for outputting a safety fault corresponding to one channel of module, and the signal indicates whether the output voltage of the channel is normal or not, and the circuit is short-circuited when the circuit is not used.
Specifically, the MON1 and MON2 ends of the two-way ideal diode driver N3 are module output voltage monitoring ends, and the corresponding fault indication ends are PWRFLT1 and PWRFLT2, which are grounded when not in use.
By adopting the technical scheme, the utility model has the following advantages:
the utility model can control the MOS tube voltage drop through the two-way ideal diode driver N3 under the condition of two-way output redundancy so as to ensure smooth current conversion from one channel to the other channel and no oscillation; if a certain power supply fails or is in short circuit, the two-way ideal diode driver chip can rapidly turn off the MOS tube, so that instantaneous reverse current can be reduced to the maximum extent; and the fault of one path of output DC-DC converter does not affect the regulation of the output voltage of the other path of DC-DC converter.
Drawings
Fig. 1 is a schematic circuit diagram of the present utility model.
Detailed Description
The present utility model is further explained below with reference to the drawings and examples, which are not to be construed as limiting the scope of the utility model, and the purpose of the present utility model is to protect all technical improvements within the scope of the utility model.
An ideal diode-based redundancy circuit is shown in connection with fig. 1, and comprises a two-way DC-DC converter output voltage regulating circuit and a two-way ideal diode driver N3.
The first path of DC-DC converter output voltage regulating circuit comprises a DC-DC converter N1, a common mode inductor L1, a resistor R1, a capacitor C2, a MOS tube M1 and a voltage stabilizing diode V1; the positive input end +VI and the negative input end-VI of the DC-DC converter N1 are respectively connected with the positive end and the negative end of the direct current voltage, the positive output end +VO and the compensating end +S of the DC-DC converter N1 are connected with the first input end of the common-mode inductor L1, and the negative output end-VO and the compensating end-S are connected with the second input end of the common-mode inductor L1; the resistor R1 is connected between the TRIM terminal and the-S terminal of the DC-DC converter N1; two ends of a capacitor C1 are connected between two input ends of the common-mode inductor L1, and two ends of a capacitor C2 are connected between two output ends of the common-mode inductor L1; the first output end of the common-mode inductor L1, the source electrode of the MOS tube M1 and the positive electrode of the voltage stabilizing diode V1 are connected and then connected to the IN1 end of the double-path ideal diode driver N3; the grid electrode of the MOS tube M1 is connected with the cathode of the voltage stabilizing diode V1 and then connected with the GATE1 end of the double-path ideal diode driver N3, and the drain electrode of the MOS tube M1 is connected with the direct-current output port +OUT; the second output terminal of the common-mode inductance L1 is connected to the dc output port-OUT.
The second path of DC-DC converter output voltage regulating circuit comprises a DC-DC converter N2, a common mode inductor L2, a resistor R2, a capacitor C3, a capacitor C4, a MOS tube M2 and a voltage stabilizing diode V2; the positive input end +VI and the negative input end-VI of the DC-DC converter N2 are respectively connected with the positive end and the negative end of the DC voltage, the positive output end +VO and the +S end of the DC-DC converter N2 are connected with the first input end of the common-mode inductor L2, and the negative output end-VO and the-S end are connected with the second input end of the common-mode inductor L2; the resistor R2 is connected between the TRIM terminal and the-S terminal of the DC-DC converter N2; two ends of a capacitor C3 are connected between two input ends of the common-mode inductor L2, and two ends of a capacitor C4 are connected between two output ends of the common-mode inductor L2; the first output end of the common-mode inductor L2, the source electrode of the MOS tube M2 and the positive electrode of the voltage stabilizing diode V2 are connected and then connected to the IN2 end of the double-path ideal diode driver N3; the grid electrode of the MOS tube M2 is connected with the cathode of the voltage stabilizing diode V2 and then connected with the GATE2 end of the double-path ideal diode driver N3, and the drain electrode of the MOS tube M2 is connected with the direct-current output port +OUT; the second output terminal of the common-mode inductance L2 is connected to the dc output port-OUT.
The double-path ideal diode driver N3 adopts a double-redundancy output chip XC4355, the FUSEFLT1 and FUSEFLT2 ends of the chip XC4355 are indication ends of corresponding one path of module output safety faults, and whether the path of output voltage is normal or not is indicated by the signal, and the circuit is short-circuited when the circuit is not used; MON1 and MON2 ends of the two-way ideal diode driver N3 are module output voltage monitoring ends, and corresponding fault indication ends are PWRFLT1 and PWRFLT2 and are grounded when not used.
The model of the ideal diode redundant circuit of the utility model is SHBS250-300S28BPIL; the specific working mode is as follows:
the DC-DC converter N1 outputs +28V voltage after the power supply is electrified, when the output voltage deviation is large, the voltage is regulated through the voltage regulating resistor R1, and then the regulated +28V direct current voltage is output after the regulated voltage is filtered through a CLC filter circuit consisting of the capacitor C1, the common mode inductor L1 and the capacitor C1.
The load current at the output end flows through the body diode of the MOS tube M1 with higher IN1 voltage of the dual-redundancy output chip XC4355, and the corresponding GATE1 pin voltage immediately rises to drive the MOS tube M1 to be turned on; XC4355 attempts to regulate the voltage drop of MOS transistor M1 to 25mV; if the voltage drop caused by the load current exceeds 25mV, the gate electrode drive of the MOS tube M1 is completely opened, the MOS tube M1 is conducted, the first path has output, and the voltage drop is equal to RDS (on): ILOAD; when the voltage of the source S and the drain D of the MOS transistor M1 is greater than +15V, the voltage of the zener diode V1 is clamped at +15V, so that the MOS transistor M1 is protected from damage.
Under the condition of power failure, for example, if the input voltage of the first path suddenly shorts to the ground, the reverse current can temporarily flow through the turned-on MOS tube M1, in this case, the XC4355 can quickly respond and quickly turn off the MOS tube M1 within 300ns, so as to prevent the reverse current from increasing, and further, the damage of the front-end power supply module caused by the reverse voltage can be effectively avoided.
The DC-DC converter N2 outputs +28V voltage after the power supply is electrified, when the output voltage deviation is large, the voltage is regulated through the voltage regulating resistor R2, and then the regulated +28V direct current voltage is output after the regulated voltage is filtered through a CLC filter circuit consisting of the capacitor C3, the common mode inductor L2 and the capacitor C4.
The load current at the output end flows through the body diode of the MOS tube M2 with higher IN2 voltage of the dual-redundancy output chip XC4355, and the corresponding GATE2 pin voltage immediately rises to drive the MOS tube M2 to be turned on; XC4355 attempts to regulate the voltage drop of MOS transistor M2 to 25mV; if the voltage drop caused by the load current exceeds 25mV, the gate electrode drive of the MOS tube M2 is completely opened, the MOS tube M2 is conducted, and the second path has output, and the voltage drop is equal to RDS (on): ILOAD; when the voltage of the source S and the drain D of the MOS transistor M2 is greater than +15V, the voltage of the zener diode V2 is clamped at +15V, so that the MOS transistor M2 is protected from damage.
Under the condition of power failure, for example, if the input voltage of the second path suddenly shorts to the ground, the reverse current can temporarily flow through the turned-on MOS tube M2, in this case, the XC4355 can quickly respond and quickly turn off the MOS tube M2 within 300ns, so as to prevent the reverse current from increasing, and further, the damage of the front-end power supply module caused by the reverse voltage can be effectively avoided.
When the voltages of the two power supplies are approximately equal, the XC4355 internal regulating mechanism ensures that the load current is switched smoothly, the MOS tubes do not oscillate, and the current flowing through each channel depends on the RDS (on) of each MOS tube and the output impedance of the power supply.
Because the MOS transistors M1 and M2 are isolated in voltage, when the M1 is abnormal due to the failure of the DC-DC converter N1, the M2 is not affected, and the output voltage of the DC-DC converter N2 is not affected; when the fault of the DC-DC converter N2 causes the abnormality of M2, M1 is not affected, and the output voltage of the first DC-DC converter N1 is not affected, so that the redundancy function is realized after the double redundancy output chip XC 4355.
The utility model is not described in detail in the prior art.
The embodiments selected herein for the purposes of disclosing the present utility model are presently considered to be suitable, however, it is to be understood that the present utility model is intended to include all such variations and modifications as fall within the spirit and scope of the present utility model.
Claims (3)
1. The redundant circuit based on the ideal diode is characterized by comprising a two-way DC-DC converter output voltage regulating circuit and a two-way ideal diode driver N3;
the first path of DC-DC converter output voltage regulating circuit comprises a DC-DC converter N1, a common mode inductor L1, a resistor R1, a capacitor C2, a MOS tube M1 and a voltage stabilizing diode V1; the positive input end +VI and the negative input end-VI of the DC-DC converter N1 are respectively connected with the positive end and the negative end of the DC voltage, the positive output end +VO and the +S end of the DC-DC converter N1 are connected with the first input end of the common-mode inductor L1, and the negative output end-VO and the-S end are connected with the second input end of the common-mode inductor L1; the resistor R1 is connected between the TRIM terminal and the-S terminal of the DC-DC converter N1; two ends of a capacitor C1 are connected between two input ends of the common-mode inductor L1, and two ends of a capacitor C2 are connected between two output ends of the common-mode inductor L1; the first output end of the common-mode inductor L1, the source electrode of the MOS tube M1 and the positive electrode of the voltage stabilizing diode V1 are connected and then connected to the IN1 end of the double-path ideal diode driver N3; the grid electrode of the MOS tube M1 is connected with the cathode of the voltage stabilizing diode V1 and then connected with the GATE1 end of the double-path ideal diode driver N3, and the drain electrode of the MOS tube M1 is connected with the direct-current output port +OUT; the second output end of the common mode inductor L1 is connected with a direct current output port-OUT;
the second path of DC-DC converter output voltage regulating circuit comprises a DC-DC converter N2, a common mode inductor L2, a resistor R2, a capacitor C3, a capacitor C4, a MOS tube M2 and a voltage stabilizing diode V2; the positive input end +VI and the negative input end-VI of the DC-DC converter N2 are respectively connected with the positive end and the negative end of the DC voltage, the positive output end +VO and the +S end of the DC-DC converter N2 are connected with the first input end of the common-mode inductor L2, and the negative output end-VO and the-S end are connected with the second input end of the common-mode inductor L2; the resistor R2 is connected between the TRIM terminal and the-S terminal of the DC-DC converter N2; two ends of a capacitor C3 are connected between two input ends of the common-mode inductor L2, and two ends of a capacitor C4 are connected between two output ends of the common-mode inductor L2; the first output end of the common-mode inductor L2, the source electrode of the MOS tube M2 and the positive electrode of the voltage stabilizing diode V2 are connected and then connected to the IN2 end of the double-path ideal diode driver N3; the grid electrode of the MOS tube M2 is connected with the cathode of the voltage stabilizing diode V2 and then connected with the GATE2 end of the double-path ideal diode driver N3, and the drain electrode of the MOS tube M2 is connected with the direct-current output port +OUT; the second output terminal of the common-mode inductance L2 is connected to the dc output port-OUT.
2. The ideal diode-based redundancy circuit of claim 1, wherein: the FUSEFLT1 and FUSEFLT2 ends of the two-way ideal diode driver N3 are indication ends corresponding to one-way module output safety faults, and whether the output voltage of the way is normal or not is indicated by the indication ends, and the circuit is short-circuited when the circuit is not used.
3. The ideal diode-based redundancy circuit of claim 1, wherein: MON1 and MON2 ends of the two-way ideal diode driver N3 are module output voltage monitoring ends, and corresponding fault indication ends are PWRFLT1 and PWRFLT2 and are grounded when not used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321817763.6U CN220368604U (en) | 2023-07-12 | 2023-07-12 | Redundant circuit based on ideal diode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321817763.6U CN220368604U (en) | 2023-07-12 | 2023-07-12 | Redundant circuit based on ideal diode |
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| Publication Number | Publication Date |
|---|---|
| CN220368604U true CN220368604U (en) | 2024-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202321817763.6U Active CN220368604U (en) | 2023-07-12 | 2023-07-12 | Redundant circuit based on ideal diode |
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- 2023-07-12 CN CN202321817763.6U patent/CN220368604U/en active Active
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