CN218868097U - Double-output power supply circuit - Google Patents
Double-output power supply circuit Download PDFInfo
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- CN218868097U CN218868097U CN202223470817.4U CN202223470817U CN218868097U CN 218868097 U CN218868097 U CN 218868097U CN 202223470817 U CN202223470817 U CN 202223470817U CN 218868097 U CN218868097 U CN 218868097U
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Abstract
The utility model discloses a double-circuit output power supply circuit, including EMI EMC and the bridge type rectifier module of input alternating current, DC-DC conversion module, two at least direct current output module and output feedback module, EMI EMC and bridge type rectifier module link to each other with DC-DC conversion module, two output module are connected to DC-DC conversion module, output module mutual independence, output feedback module with DC-DC conversion module links to each other. The utility model discloses keep apart completely between two way output circuit. The method not only meets the application requirements, but also can solve the problem of electrical isolation among loops, improves the reliability of products and reduces the cost.
Description
Technical Field
The utility model relates to a multichannel output power.
Background
In many project applications, a switching power supply with dual output is required to be used, and in the dual output power supply in the current market, two output loops are designed in a common ground mode, and complete isolation among different output loops is not achieved. When one of the output loops fails, the devices of the other loop are easily damaged due to the common ground. A small part of the power supply is designed into a power supply with double-path isolated output, and the power supply is realized by adding a DC-DC isolated conversion circuit on a main output power supply loop, so that the cost is higher.
Disclosure of Invention
The utility model discloses the purpose is: the double-output power supply with completely isolated output loops of two outputs is provided.
The technical scheme of the utility model is that: a double-output power circuit comprises an EMI/EMC and bridge rectifier module for inputting alternating current, a DC-DC conversion module, at least two direct current output modules of a first output module and a second output module and an output feedback module, wherein the EMI/EMC and bridge rectifier module is connected with the DC-DC conversion module, the DC-DC conversion module is connected with the first output module and the second output module, the first output module and the second output module are mutually independent, and the output feedback module is connected with the DC-DC conversion module.
Further, EMI EMC and bridge rectifier module include piezo-resistor, electric capacity, common mode inductance, rectifier bridge and first electrolytic capacitor, EMI EMC and bridge rectifier module input alternating current EMI EMC and bridge rectifier module's L, N input connect piezo-resistor and electric capacity in parallel, then through common mode inductance, connect the rectifier bridge, connect first electrolytic capacitor between two output of rectifier bridge.
Further, the DC-DC conversion module comprises a power management chip and a transformer, a B/O pin of the power management chip is connected with a high level output by the EMI/EMC and the bridge rectifier module through a first resistor, and is grounded through a second resistor, a D pin of the power management chip is connected with the high level output by the EMI/EMC and the bridge rectifier module through a main winding of the transformer, one end of an auxiliary winding of the transformer is grounded, the other end of the auxiliary winding is connected with a VCC pin of the power management chip through a first diode, the VCC pin is grounded through a second electrolytic capacitor, an S pin of the power management chip is grounded through a third resistor, a TIMER pin of the power management chip is grounded through a first capacitor, and an FB pin of the power management chip is connected with the output feedback module through an optocoupler.
Furthermore, the first output module includes a second diode, a third electrolytic capacitor and a fourth resistor, one end of the Ns1 winding of the transformer is connected to the first output voltage ground, the other end of the Ns1 winding of the transformer provides a direct current voltage through a rectifying and filtering circuit formed by the second diode and the third electrolytic capacitor, the cathode of the third electrolytic capacitor is connected to one end of the fourth resistor and to the first output voltage ground, and the anode of the third electrolytic capacitor is connected to the anode of the first output voltage through the other end of the fourth resistor 4.
Further, the second output module comprises a fourth chip, a third diode, a fourth electrolytic capacitor, a fifth resistor, a sixth resistor and a seventh resistor, one end of the Ns2 winding of the transformer is connected with the anode of the fourth electrolytic capacitor through the third diode, the anode of the fourth electrolytic capacitor is connected with pin 1 of the fourth chip through the fifth resistor, and pin 2 of the fourth chip is connected to pin 1 of the chip and the anode of the second output voltage through the sixth resistor; and the pin 2 of the fourth chip is connected to a second output voltage ground through a seventh resistor, and the other end of the Ns2 winding of the transformer is connected with the negative electrode of the fourth electrolytic capacitor and is connected to the second output voltage ground.
Further, the output feedback module comprises an optical coupler chip, a third chip, a second capacitor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor and a twelfth resistor, wherein pin 1 of the optical coupler is connected to the direct current output voltage Vs1 of the first output module through the eighth resistor, pin 2 of the optical coupler is connected to the ninth resistor, the tenth resistor and pin 1 of the third chip, and the other end of the ninth resistor is connected to pin 1 of the optical coupler; the other end of the tenth resistor is connected with a pin 2 of the third chip through a second capacitor; a pin 2 of the third chip is connected to a direct current output voltage Vs1 of the first output module through an eleventh resistor, and a pin 2 of the third chip is connected to the ground of the first output module through a twelfth resistor; and the 3 pins of the third chip are connected with the ground of the first output module.
The utility model has the advantages that: the output loops are isolated from each other, the reliability is good, the application requirement is met, the electrical isolation problem among the loops can be solved, the reliability of the product is improved, and the cost is reduced.
Drawings
The invention will be further described with reference to the following drawings and examples:
fig. 1 is a circuit diagram of the dual output power circuit of the present invention.
Detailed Description
The embodiment is as follows: the dual-output power circuit shown in fig. 1 comprises an EMI/EMC and bridge rectifier module for inputting alternating current, a DC-DC conversion module, two first output modules and second output modules for outputting direct current, and an output feedback module, wherein the EMI/EMC and bridge rectifier module are connected to the DC-DC conversion module, the DC-DC conversion module is connected to the two output modules of the first output module and the second output module, the two output modules are independent from each other, and the output feedback module is connected to the DC-DC conversion module.
EMI EMC and bridge rectifier module in this embodiment includes piezo-resistor VR1, electric capacity CX1, common mode inductance L1, rectifier bridge BD1 and first electrolytic capacitor CE1, EMI EMC and bridge rectifier module input alternating current, at EMI EMC and bridge rectifier module's L, parallelly connected piezo-resistor VR1 of N input and electric capacity CX1, then through common mode inductance L1, connect rectifier bridge BD1, connect first electrolytic capacitor CE1 between two output of rectifier bridge BD 1.
The DC-DC conversion module in this embodiment includes a power management chip HF500 and a transformer T1.
The B/O pin of the power management chip HF500 is connected to the EMI/EMC and the high level Vbus output by the bridge rectifier module through a first resistor R1, and is connected to ground through a second resistor R2.
The pin D of the power management chip HF500 is connected with EMI/EMC and high level Vbus output by the bridge rectifier module through the main winding of the transformer, one end of the auxiliary winding of the transformer T1 is grounded, the other end of the auxiliary winding of the transformer T1 is connected with the VCC pin of the power management chip HF500 through the first diode D1, and the VCC pin is grounded through the second electrolytic capacitor CE 2.
The S pin of the power management chip HF500 is grounded through a third resistor R3.
The TIMER pin of the power management chip HF500 is connected to ground through a first capacitor C1.
The FB pin of the power management chip HF500 is connected with the output feedback module through the optical coupler IC 2.
The first output module in this embodiment includes a second diode D2, a third electrolytic capacitor CE3, and a fourth resistor R4, one end of the Ns1 winding of the transformer T1 is connected to the first output voltage ground GND1, the other end of the Ns1 winding provides a dc voltage through a rectifying and filtering circuit formed by the second diode D2 and the third electrolytic capacitor CE3, the cathode of the third electrolytic capacitor CE3 is connected to one end of the fourth resistor R4 and is connected to the first output voltage ground GND1, and the anode of the third electrolytic capacitor CE3 is connected to the first output voltage anode through the other end of the fourth resistor R4.
The second output module in this embodiment includes a fourth chip IC4, a third diode D3, a fourth electrolytic capacitor CE4, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7, one end of the Ns2 winding of the transformer T1 is connected to the anode of the fourth electrolytic capacitor CE4 through the third diode D3, the anode of the fourth electrolytic capacitor CE4 is connected to the pin 1 of the fourth chip IC4 through the fifth resistor R5, and the pin 2 of the fourth chip IC4 is connected to the pin 1 of the chip IC4 and the second output voltage anode through the sixth resistor R6; the pin 2 of the fourth chip IC4 is connected to the second output voltage ground GND2 via the seventh resistor R7, and the other end of the Ns2 winding of the transformer T1 is connected to the negative electrode of the fourth electrolytic capacitor CE4 and to the second output voltage ground GND2. The first output module and the second output module realize double-path output by adopting a mode of adding windings by a transformer, and the cost is low. And the power supply can be expanded into a multi-output power supply, and the expansibility is strong.
The output feedback module in this embodiment includes 817 optical coupler chip IC2, third chip IC3, second capacitor C2, eighth resistor R8, ninth resistor R9, tenth resistor R10, eleventh resistor R11 and twelfth resistor R12, pin 1 of the optical coupler IC2 is connected to dc output voltage Vs1 of the first output module through eighth resistor R8, pin 2 of the optical coupler IC2 is connected to ninth resistor R9, tenth resistor R10 and pin 1 of the third chip IC3, and the other end of the ninth resistor R9 is connected to pin 1 of the optical coupler IC 2; the other end of the tenth resistor R10 is connected with a pin 2 of the third chip IC3 through a second capacitor C2; a pin 2 of the third chip IC3 is connected to the dc output voltage Vs1 of the first output module through an eleventh resistor R11, and a pin 2 of the third chip IC3 is connected to the ground of the first output module through a twelfth resistor R12; the pin 3 of the third chip IC3 is connected to the first output module ground. Thus, the two output loops are completely isolated. The method not only meets the application requirements, but also can solve the problem of electrical isolation among loops, improves the reliability of products and reduces the cost.
The third chip IC3 and the fourth chip IC4 both adopt 431 chips for constant voltage control, and the circuit is simple.
The above-mentioned embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which should not be construed as limiting the scope of the present invention. All modifications made according to the spirit of the main technical scheme of the present invention shall be covered within the protection scope of the present invention.
Claims (6)
1. A double-output power circuit is characterized by comprising an EMI/EMC and bridge rectifier module for inputting alternating current, a DC-DC conversion module and an output feedback module, wherein the DC-DC conversion module at least comprises a first output module, a second output module, two direct current output modules and the output feedback module, the EMI/EMC and bridge rectifier module is connected with the DC-DC conversion module, the DC-DC conversion module is connected with the first output module and the second output module, the first output module and the second output module are mutually independent, and the output feedback module is connected with the DC-DC conversion module.
2. The dual output power circuit of claim 1, wherein the EMI/EMC and bridge rectifier module comprises a voltage dependent resistor (VR 1), a capacitor (CX 1), a common mode inductor (L1), a rectifier bridge (BD 1) and a first electrolytic capacitor (CE 1), the EMI/EMC and bridge rectifier module inputs an alternating current, the voltage dependent resistor (VR 1) and the capacitor (CX 1) are connected in parallel to the L and N inputs of the EMI/EMC and bridge rectifier module, and then the rectifier bridge (BD 1) is connected through the common mode inductor (L1), and the first electrolytic capacitor (CE 1) is connected between two outputs of the rectifier bridge (BD 1).
3. The dual output power circuit of claim 2, wherein the DC-DC conversion module comprises a power management chip (HF 500) and a transformer (T1), a B/O pin of the power management chip (HF 500) is connected to the high level (Vbus) output by the EMI/EMC and bridge rectifier module through a first resistor (R1) and is connected to ground through a second resistor (R2), a D pin of the power management chip (HF 500) is connected to the high level (Vbus) output by the EMI/EMC and bridge rectifier module through a primary winding of the transformer, an auxiliary winding of the transformer (T1) is connected to ground at one end and is connected to the VCC pin of the power management chip (HF 500) through a first diode (D1), the VCC pin is connected to ground at the same time through a second electrolytic capacitor (CE 2), an S pin of the power management chip (HF 500) is connected to ground through a third resistor (R3), a TIMER pin of the power management chip (HF 500) is connected to ground through a first capacitor (C1), and a feedback pin of the power management chip (HF 500) is connected to the feedback module (FB 2).
4. The dual output power circuit of claim 3, wherein the first output module comprises a second diode (D2), a third electrolytic capacitor (CE 3) and a fourth resistor (R4), one end of the Ns1 winding of the transformer (T1) is connected to the first output voltage ground (GND 1), the other end of the Ns1 winding of the transformer (T1) is connected to the third output voltage ground (GND 3) through a rectifying and filtering circuit formed by the second diode (D2) and the third electrolytic capacitor (CE 3), the negative electrode of the third electrolytic capacitor (CE 3) is connected to one end of the fourth resistor (R4) and connected to the first output voltage ground (GND 1), and the positive electrode of the third electrolytic capacitor (CE 3) is connected to the first output voltage positive electrode through the other end of the fourth resistor (R4).
5. The dual output power circuit of claim 4, wherein the second output module comprises a fourth chip (IC 4), a third diode (D3), a fourth electrolytic capacitor (CE 4), a fifth resistor (R5), a sixth resistor (R6) and a seventh resistor (R7), one end of the Ns2 winding of the transformer (T1) is connected with the positive electrode of the fourth electrolytic capacitor (CE 4) through the third diode (D3), the positive electrode of the fourth electrolytic capacitor (CE 4) is connected with the pin 1 of the fourth chip (IC 4) through the fifth resistor (R5), and the pin 2 of the fourth chip (IC 4) is connected with the pin 1 of the chip (IC 4) and the positive electrode of the second output voltage through the sixth resistor (R6); and the pin 2 of the fourth chip (IC 4) is connected to the second output voltage ground (GND 2) through a seventh resistor (R7), and the other end of the Ns2 winding of the transformer (T1) is connected with the cathode of a fourth electrolytic capacitor (CE 4) and is connected to the second output voltage ground (GND 2).
6. The dual-output power circuit of claim 5, wherein the output feedback module comprises an optical coupler (IC 2), a third chip (IC 3), a second capacitor (C2), an eighth resistor (R8), a ninth resistor (R9), a tenth resistor (R10), an eleventh resistor (R11) and a twelfth resistor (R12), wherein a pin 1 of the optical coupler (IC 2) is connected to the DC output voltage Vs1 of the first output module through the eighth resistor (R8), a pin 2 of the optical coupler (IC 2) is connected to the pin 1 of the ninth resistor (R9), the tenth resistor (R10) and the third chip (IC 3), and the other end of the ninth resistor (R9) is connected to the pin 1 of the optical coupler (IC 2); the other end of the tenth resistor (R10) is connected with a pin 2 of a third chip (IC 3) through a second capacitor (C2); a pin 2 of the third chip (IC 3) is connected to a direct current output voltage Vs1 of the first output module through an eleventh resistor (R11), and a pin 2 of the third chip (IC 3) is connected to the ground of the first output module through a twelfth resistor (R12); the 3 pins of the third chip (IC 3) are connected with the first output module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223470817.4U CN218868097U (en) | 2022-12-06 | 2022-12-06 | Double-output power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223470817.4U CN218868097U (en) | 2022-12-06 | 2022-12-06 | Double-output power supply circuit |
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| Publication Number | Publication Date |
|---|---|
| CN218868097U true CN218868097U (en) | 2023-04-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223470817.4U Active CN218868097U (en) | 2022-12-06 | 2022-12-06 | Double-output power supply circuit |
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| CN (1) | CN218868097U (en) |
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- 2022-12-06 CN CN202223470817.4U patent/CN218868097U/en active Active
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