Single-winding double-output high-power power supply

Abstract

The utility model discloses a single winding double output high -power power supply, including with the filter rectifier circuit of alternating current input connection, with the PFC circuit of filter rectifier circuit output connection, with the flyback two constant voltage output circuits of PFC circuit output connection. Flyback two constant voltage output circuit includes the integrated chip IC3 of setting between transformer TR2 primary side circuit and transformer TR2 secondary side winding, is provided with the pin 5 and pin 9 of being connected with transformer TR2 secondary side winding respectively on integrated chip IC3, pin 9 is connected through field effect transistor Q3 and with field effect transistor Q3 series connection setting's first output branch, and first output branch exports 15v voltage, pin 5 is connected through field effect transistor Q2 and with field effect transistor Q2 series connection setting's second output branch, and second output branch exports 12v voltage. The utility model discloses power supply second road output voltage power accuracy is at 3 5%, can satisfy the occasion of high output requirement.

Description

Technical Field

[0001] This utility model relates to a single-winding dual-output high-power power supply, and more particularly to a low-cost, high-voltage-accuracy single-winding dual-output high-power power supply. Background Technology

[0002] Traditional power supplies have two outputs, using two windings of a transformer. The disadvantages are: 1. The cost of multiple windings of the transformer is high; 2. There is only one feedback (main circuit) for the output voltage, and the other relies on the coupling of the transformer. When the main circuit is under light or heavy load, the output voltage of the other circuit fluctuates greatly by ±20%; 3. The application is limited.

[0003] The conventional approach is as follows: multi-winding transformer output, with multiple windings coupled through the transformer to output different voltages; LDO added to the output to improve the stability of the output voltage; DC-DC switch control at the output, achieving output voltage stability through a DC-DC switching conversion circuit at the output terminal.

[0004] Based on the above-mentioned problems, we urgently need to develop a single-winding, dual-output high-power power supply with high output voltage accuracy to meet the needs of efficient multi-output power supplies in industrial, smart meter, and home appliance applications. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a single-winding dual-output high-power power supply with the characteristics of low cost and high output voltage accuracy.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a single-winding dual-output high-power power supply, the innovation of which is: the single-winding dual-output high-power power supply includes a filter rectifier circuit connected to the AC input, a PFC circuit connected to the output of the filter rectifier circuit, and a flyback two-way constant voltage output circuit connected to the output of the PFC circuit.

[0007] The flyback dual-channel constant voltage output circuit includes a primary winding of transformer TR2 connected to the output of PFC circuit, a primary circuit of transformer TR2 located between the output of PFC circuit and the primary winding of transformer TR2, and an integrated chip IC3 located between the primary circuit of transformer TR2 and the secondary winding of transformer TR2. The integrated chip IC3 has pins 5 and 9 connected to the secondary winding of transformer TR2 respectively. Pin 9 is connected to a first output branch connected in series with field-effect transistor Q3 through field-effect transistor Q3. The first output branch outputs a 15V voltage. Pin 5 is connected to a second output branch connected in series with field-effect transistor Q2 through field-effect transistor Q2. The second output branch outputs a 12V voltage.

[0008] Preferably, the filter rectifier circuit includes a common-mode inductor LF2 and a variable resistor VR1 disposed between the AC input ACL terminal and the AC input ACN terminal, a thermistor RT1 disposed between the AC input ACL terminal and the common-mode inductor LF2, a common-mode inductor LF1 disposed in series with the common-mode inductor LF2, and a bridge rectifier circuit disposed in series with the common-mode inductor LF1. The output terminal of the bridge rectifier circuit is connected to the PFC circuit via the bridge rectifier branch and the output terminal VRECT of the filter rectifier circuit.

[0009] Preferably, a capacitor CX1 is connected in series between the common mode inductor LF2 and the common mode inductor LF1; the input terminal of the bridge rectifier circuit is connected to the AC input PE terminal through capacitors CY1 and CY2 connected in parallel.

[0010] The bridge rectifier branch includes a capacitor CB1 located at the output end of the bridge rectifier circuit, an inductor L1 located at the output end of the bridge rectifier circuit, a capacitor CB2 connected in series with the inductor L1 and connected in parallel with each other, and a capacitor C34. One end of the capacitor C34 is grounded, and the other end of the capacitor C34 is the output end VRECT of the filter rectifier circuit.

[0011] Preferably, the PFC circuit includes a transformer L2 connected to the filter rectifier circuit, an integrated chip IC1 connected to the transformer L2, and a feedback circuit connected to the integrated chip IC1. The feedback circuit is provided with an output terminal Vbus of a regulated 390V voltage connected to the flyback two-way constant voltage output circuit.

[0012] Preferably, the integrated chip IC1 is a PFS5176F.

[0013] Preferably, the feedback circuit is located between pin 21 on the integrated chip IC1 and transformer L2. Pin 21 on the integrated chip IC1 is grounded. Electrolytic capacitors EC1 and EC3, electrolytic capacitors EC2 and EC4, and resistors RX1 and RX2 are connected in series between pin 21 on the integrated chip IC1 and transformer L2. Electrolytic capacitors EC1, EC2 and RX1 are connected in parallel.

[0014] A diode D2 is provided between the transformer L2 and the feedback circuit. A capacitor C2 and a resistor R3 are connected in parallel and in series on the diode D2. The diode D2 is connected to the output terminal Vbus after intersecting with the feedback circuit.

[0015] Preferably, the primary side circuit of the transformer TR2 includes resistors R61, R35, R39, and capacitor C24 connected in series across the primary winding of the transformer TR2; resistors R62, R36, R40, and diode D7 connected in series across the primary winding of the transformer TR2; resistors R61 and R62 connected in parallel; resistors R35 and R36 connected in parallel; resistors R39 and R40 connected in parallel; capacitor C24 and diode D7 connected in parallel; the series-connected resistors R62 and R36 connected in parallel with capacitor C20; capacitor C20 grounded through capacitor C35; capacitor C24 connected to the integrated chip IC3; and resistor R61 connected to the output of the PFC circuit.

[0016] Preferably, the transformer TR2 is provided with a primary secondary winding, and the primary secondary winding of the transformer TR2 is connected to the primary secondary winding circuit of the transformer TR2.

[0017] The primary winding circuit of transformer TR2 includes diode D6, resistors R69 and R70 connected in series with diode D6 and in parallel with each other, and electrolytic capacitor EC9 connected in series with resistors R69 and R70. Electrolytic capacitor EC9 is connected to one end of the primary winding of transformer TR2 and then grounded. Resistor R37 and capacitor C21 are connected in parallel with diode D6 and in series with each other.

[0018] The intersection of resistor R69 and electrolytic capacitor EC9 is the VCC-P2 terminal. The VCC-P2 terminal is connected to pin 17 on integrated chip IC3 through diodes ZD5 and D10 and resistor R49, which are connected in series. Pin 17 on integrated chip IC3 is grounded through capacitor C33. A resistor R46 is connected in parallel with diode ZD5.

[0019] Preferably, the integrated chip IC3 is an IMX2378F;

[0020] The first output branch includes a diode ZD4 connected in series with the field-effect transistor Q3 and a diode D5 connected in series with the diode ZD4. The diode ZD4 is located across the secondary winding of the transformer TR2. A capacitor C80 and a resistor R80 are connected in parallel with the diode ZD4. A capacitor C22 and a resistor R42 are connected in parallel with the field-effect transistor Q3. A resistor R41 is connected in parallel with the resistor R42. A capacitor C19 and a resistor R34 are connected in parallel with the diode D5. A resistor R33 is connected in parallel with the resistor R34. The end of the diode D5 furthest from the diode ZD4 is the output terminal of the first output branch. The output terminal of the first output branch is grounded through an electrolytic capacitor EC11. An electrolytic capacitor EC10 is connected in parallel with the electrolytic capacitor EC11.

[0021] Preferably, the second output branch includes a diode ZD3 and a resistor R38 connected in parallel with the field-effect transistor Q2. The field-effect transistor Q2 is connected to pin 5 through a capacitor C23. One end of the field-effect transistor Q2 is connected to one end of the secondary winding of the transformer TR2, and the other end of the field-effect transistor Q2 is the output terminal of the second output branch. The output terminal of the second output branch is grounded through an electrolytic capacitor EC14, and an electrolytic capacitor EC13 is connected in parallel with the electrolytic capacitor EC14.

[0022] The advantages of this invention are as follows: The power supply of this invention can be used in home appliances, industry, charging piles, and other fields, especially in applications requiring high accuracy of multi-output voltage. Compared to conventional multi-output power supplies with a second output voltage accuracy of ±20%, which is unsuitable for applications with high output requirements, the power supply of this invention has a second output voltage accuracy of 3-5%, which can meet the needs of applications with high output requirements, such as high-end home appliances and motherboards with MCUs and intelligent modules that have high power supply voltage requirements. The single-winding dual-output power supply design reduces costs, improves output voltage accuracy, and has wider compatibility with market applications.

[0023] Compared with the existing structure, this utility model has the following advantages: 1. It provides constant voltage control of <±5% for load step transitions from 0-100%; 2. It can provide overload protection for each output; 3. It does not require a subsequent voltage regulator circuit; 4. The output is synchronously rectified, which can achieve a power efficiency of over 90%. Attached Figure Description

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 This is a circuit diagram of a filter and rectifier circuit in a single-winding dual-output high-power power supply according to this utility model.

[0026] Figure 2 This is a circuit diagram of the PFC circuit in a single-winding dual-output high-power power supply according to this utility model.

[0027] Figure 3 This is a circuit diagram of a flyback dual-constant voltage output circuit in a single-winding dual-output high-power power supply according to this utility model. Detailed Implementation

[0028] The single-winding dual-output high-power power supply of this utility model includes a filter and rectifier circuit connected to the AC input, a PFC circuit connected to the output of the filter and rectifier circuit, and a flyback two-way constant voltage output circuit connected to the output of the PFC circuit.

[0029] The flyback dual constant voltage output circuit includes the primary winding of transformer TR2 connected to the output of PFC circuit, the primary winding of transformer TR2 located between the output of PFC circuit and the primary winding of transformer TR2, and an integrated chip IC3 located between the primary winding of transformer TR2 and the secondary winding of transformer TR2. The integrated chip IC3 has pins 5 and 9 connected to the secondary winding of transformer TR2 respectively. Pin 9 is connected to a first output branch connected in series with field-effect transistor Q3 through field-effect transistor Q3. The first output branch outputs a 15V voltage. Pin 5 is connected to a second output branch connected in series with field-effect transistor Q2 through field-effect transistor Q2. The second output branch outputs a 12V voltage.

[0030] This utility model's power supply can be used in home appliances, industry, charging piles, and other fields, especially in applications requiring high accuracy for multi-output voltages. Compared to conventional multi-output power supplies with a second output voltage accuracy of ±20%, which is unsuitable for applications with high output requirements, this utility model's power supply has a second output voltage accuracy of 3-5%, meeting the needs of applications with high output requirements, such as high-end home appliances and motherboards with MCUs and intelligent modules that require high power supply voltage. The single-winding dual-output power supply design reduces costs, improves output voltage accuracy, and has wider compatibility with market applications.

[0031] The filter rectifier circuit of this utility model includes a common-mode inductor LF2 and a variable resistor VR1 disposed between the AC input ACL terminal and the AC input ACN terminal, a thermistor RT1 disposed between the AC input ACL terminal and the common-mode inductor LF2, a common-mode inductor LF1 disposed in series with the common-mode inductor LF2, and a bridge rectifier circuit disposed in series with the common-mode inductor LF1. The output terminal of the bridge rectifier circuit is connected to the PFC circuit via the bridge rectifier branch and the output terminal VRECT of the filter rectifier circuit.

[0032] A capacitor CX1 is connected in series between the common-mode inductor LF2 and the common-mode inductor LF1 mentioned above; the input terminal of the bridge rectifier circuit is connected to the AC input PE terminal through capacitors CY1 and CY2 connected in parallel.

[0033] The bridge rectifier branch includes capacitor CB1 located at the output terminal of the bridge rectifier circuit, inductor L1 located at the output terminal of the bridge rectifier circuit, capacitor CB2 connected in series with inductor L1 and connected in parallel with each other, and capacitor C34. One end of capacitor C34 is grounded, and the other end of capacitor C34 is the output terminal VRECT of the filter rectifier circuit.

[0034] The PFC circuit of this utility model includes a transformer L2 connected to the filter rectifier circuit, an integrated chip IC1 connected to the transformer L2, and a feedback circuit connected to the integrated chip IC1. The feedback circuit is provided with an output terminal Vbus of 390V voltage for output regulation, which is connected to the flyback two-way constant voltage output circuit. The integrated chip IC1 of this utility model is PFS5176F (not limited to this model).

[0035] The feedback circuit of this invention is located between pin 21 of the integrated chip IC1 and transformer L2. Pin 21 of the integrated chip IC1 is grounded. Between pin 21 of the integrated chip IC1 and transformer L2, there are electrolytic capacitors EC1 and EC3 connected in series, electrolytic capacitors EC2 and EC4 connected in series, and resistors RX1 and RX2 connected in series. Electrolytic capacitors EC1, EC2, and RX1 are connected in parallel. A diode D2 is located between transformer L2 and the feedback circuit. A capacitor C2 and a resistor R3 connected in series are connected in parallel to diode D2. Diode D2 intersects with the feedback circuit and is connected to the output terminal Vbus.

[0036] The primary side circuit of transformer TR2 of this utility model includes resistors R61, R35, R39 and capacitor C24 connected in series across the primary winding of transformer TR2; resistors R62, R36, R40 and diode D7 connected in series across the primary winding of transformer TR2; resistors R61 and R62 connected in parallel; resistors R35 and R36 connected in parallel; resistors R39 and R40 connected in parallel; capacitor C24 and diode D7 connected in parallel; resistors R62 and R36 connected in series are connected in parallel with capacitor C20; capacitor C20 is grounded through capacitor C35; capacitor C24 is connected to integrated chip IC3; and resistor R61 is connected to the output of PFC circuit.

[0037] The aforementioned transformer TR2 is equipped with a primary secondary winding, which is connected to the primary secondary winding circuit of transformer TR2. The primary secondary winding circuit of transformer TR2 includes a diode D6, resistors R69 and R70 connected in series with and in parallel with diode D6, and an electrolytic capacitor EC9 connected in series with the parallel resistors R69 and R70. Electrolytic capacitor EC9 is connected to one end of the primary secondary winding of transformer TR2 and then grounded. A resistor R37 and a capacitor C21 are connected in parallel with diode D6 and connected in series with each other.

[0038] The intersection of resistor R69 and electrolytic capacitor EC9 is the VCC-P2 terminal. The VCC-P2 terminal is connected to pin 17 on integrated chip IC3 through diodes ZD5 and D10 and resistor R49, which are connected in series. Pin 17 on integrated chip IC3 is grounded through capacitor C33. Resistor R46 is connected in parallel with diode ZD5.

[0039] The integrated chip IC3 of this utility model is IMX2378F (not limited to this model). The first output branch includes diode ZD4 connected in series with field-effect transistor Q3 and diode D5 connected in series with diode ZD4. Diode ZD4 is located at both ends of the secondary winding of transformer TR2. A capacitor C80 and a resistor R80 connected in series are connected in parallel with diode ZD4. A capacitor C22 and a resistor R42 connected in series are connected in parallel with field-effect transistor Q3. A resistor R41 is connected in parallel with resistor R42. A capacitor C19 and a resistor R34 connected in series are connected in parallel with diode D5. A resistor R33 is connected in parallel with resistor R34. The end of diode D5 furthest from diode ZD4 is the output terminal of the first output branch. The output terminal of the first output branch is grounded through electrolytic capacitor EC11. An electrolytic capacitor EC10 is connected in parallel with electrolytic capacitor EC11.

[0040] The second output branch includes a diode ZD3 and a resistor R38 connected in parallel with the field-effect transistor Q2. The field-effect transistor Q2 is connected to pin 5 through a capacitor C23. One end of the field-effect transistor Q2 is connected to one end of the secondary winding of the transformer TR2, and the other end of the field-effect transistor Q2 is the output terminal of the second output branch. The output terminal of the second output branch is grounded through an electrolytic capacitor EC14, and an electrolytic capacitor EC13 is connected in parallel with the electrolytic capacitor EC14.

[0041] This invention's multi-output control independently adjusts each output by requesting pulses from the primary winding based on the pin voltage of the integrated chip IC3 for each output. Transformer energy is then directed cycle-by-cycle to the output requiring power. This is achieved by turning on the corresponding gating MOSFET Q2 or Q3 connected in series with the outputs CV1 or CV2; the transformer design should ensure that VOR is between VCV1 and VCV2.

[0042] Compared with the existing structure, this utility model has the following advantages: 1. It provides constant voltage control of <±5% for load step transitions from 0-100%; 2. It can provide overload protection for each output; 3. It does not require a subsequent voltage regulator circuit; 4. The output is synchronously rectified, which can achieve a power efficiency of over 90%.

[0043] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and applications beyond the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this teaching should not be determined by reference to the above description, but rather by reference to the appended claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the inventors have not considered that subject matter as part of the disclosed utility model subject matter.

Claims

1. A single winding dual output high power supply, characterized by: The single-winding dual-output high-power power supply includes a filter and rectifier circuit connected to the AC input, a PFC circuit connected to the output of the filter and rectifier circuit, and a flyback two-way constant voltage output circuit connected to the output of the PFC circuit. The flyback dual-channel constant voltage output circuit includes a primary winding of transformer TR2 connected to the output of PFC circuit, a primary circuit of transformer TR2 located between the output of PFC circuit and the primary winding of transformer TR2, and an integrated chip IC3 located between the primary circuit of transformer TR2 and the secondary winding of transformer TR2. The integrated chip IC3 has pins 5 and 9 connected to the secondary winding of transformer TR2 respectively. Pin 9 is connected to a first output branch connected in series with field-effect transistor Q3 through field-effect transistor Q3. The first output branch outputs a 15V voltage. Pin 5 is connected to a second output branch connected in series with field-effect transistor Q2 through field-effect transistor Q2. The second output branch outputs a 12V voltage.

2. A single winding double output high power supply as claimed in claim 1, characterized in that: The filtering and rectifier circuit includes a common-mode inductor LF2 and a variable resistor VR1 disposed between the AC input ACL terminal and the AC input ACN terminal, a thermistor RT1 disposed between the AC input ACL terminal and the common-mode inductor LF2, a common-mode inductor LF1 disposed in series with the common-mode inductor LF2, and a bridge rectifier circuit disposed in series with the common-mode inductor LF1. The output terminal of the bridge rectifier circuit is connected to the PFC circuit via the bridge rectifier branch and the output terminal VRECT of the filtering and rectifier circuit.

3. A single winding double output high power supply as claimed in claim 2, characterized in that: A capacitor CX1 is connected in series between the common mode inductor LF2 and the common mode inductor LF1; the input terminal of the bridge rectifier circuit is connected to the AC input PE terminal through capacitors CY1 and CY2 connected in parallel. The bridge rectifier branch includes a capacitor CB1 located at the output end of the bridge rectifier circuit, an inductor L1 located at the output end of the bridge rectifier circuit, a capacitor CB2 connected in series with the inductor L1 and connected in parallel with each other, and a capacitor C34. One end of the capacitor C34 is grounded, and the other end of the capacitor C34 is the output end VRECT of the filter rectifier circuit.

4. A single winding double output high power supply as claimed in claim 1, wherein: The PFC circuit includes a transformer L2 connected to the filter rectifier circuit, an integrated chip IC1 connected to the transformer L2, and a feedback circuit connected to the integrated chip IC1. The feedback circuit is provided with an output terminal Vbus of 390V voltage, which is connected to the flyback two-way constant voltage output circuit.

5. A single winding double output high power supply as claimed in claim 4, characterized in that: The integrated chip IC1 is PFS5176F.

6. A single winding double output high power supply as claimed in claim 4, wherein: The feedback circuit is set between pin 21 on the integrated chip IC1 and transformer L2. Pin 21 on the integrated chip IC1 is grounded. Electrolytic capacitors EC1 and EC3, electrolytic capacitors EC2 and EC4, and resistors RX1 and RX2 are connected in series between pin 21 on the integrated chip IC1 and transformer L2. Electrolytic capacitors EC1, EC2 and RX1 are connected in parallel. A diode D2 is provided between the transformer L2 and the feedback circuit. A capacitor C2 and a resistor R3 are connected in parallel and in series on the diode D2. The diode D2 is connected to the output terminal Vbus after intersecting with the feedback circuit.

7. A single-winding dual-output high-power power supply as described in claim 1, characterized in that: The primary side circuit of transformer TR2 includes resistors R61, R35, R39, and capacitor C24 connected in series across the primary winding of transformer TR2; resistors R62, R36, R40, and diode D7 connected in series across the primary winding of transformer TR2; resistors R61 and R62 connected in parallel; resistors R35 and R36 connected in parallel; resistors R39 and R40 connected in parallel; capacitor C24 and diode D7 connected in parallel; resistors R62 and R36 connected in series connected in parallel with capacitor C20; capacitor C20 is grounded through capacitor C35; capacitor C24 is connected to integrated chip IC3; and resistor R61 is connected to the output of PFC circuit.

8. A single winding double output high power supply as claimed in claim 7, characterized in that: The transformer TR2 is provided with a primary secondary winding, which is connected to the primary secondary winding circuit of the transformer TR2. The primary winding circuit of transformer TR2 includes diode D6, resistors R69 and R70 connected in series with diode D6 and in parallel with each other, and electrolytic capacitor EC9 connected in series with resistors R69 and R70. Electrolytic capacitor EC9 is connected to one end of the primary winding of transformer TR2 and then grounded. Resistor R37 and capacitor C21 are connected in parallel with diode D6 and in series with each other. The intersection of resistor R69 and electrolytic capacitor EC9 is the VCC-P2 terminal. The VCC-P2 terminal is connected to pin 17 on integrated chip IC3 through diodes ZD5 and D10 and resistor R49, which are connected in series. Pin 17 on integrated chip IC3 is grounded through capacitor C33. A resistor R46 is connected in parallel with diode ZD5.

9. A single winding double output high power supply as claimed in claim 1, wherein: The integrated chip IC3 is an IMX2378F; The first output branch includes a diode ZD4 connected in series with the field-effect transistor Q3 and a diode D5 connected in series with the diode ZD4. The diode ZD4 is located across the secondary winding of the transformer TR2. A capacitor C80 and a resistor R80 are connected in parallel with the diode ZD4. A capacitor C22 and a resistor R42 are connected in parallel with the field-effect transistor Q3. A resistor R41 is connected in parallel with the resistor R42. A capacitor C19 and a resistor R34 are connected in parallel with the diode D5. A resistor R33 is connected in parallel with the resistor R34. The end of the diode D5 furthest from the diode ZD4 is the output terminal of the first output branch. The output terminal of the first output branch is grounded through an electrolytic capacitor EC11. An electrolytic capacitor EC10 is connected in parallel with the electrolytic capacitor EC11.

10. A single winding double output high power supply as claimed in claim 1, wherein: The second output branch includes a diode ZD3 and a resistor R38 connected in parallel with the field-effect transistor Q2. The field-effect transistor Q2 is connected to pin 5 through a capacitor C23. One end of the field-effect transistor Q2 is connected to one end of the secondary winding of the transformer TR2, and the other end of the field-effect transistor Q2 is the output terminal of the second output branch. The output terminal of the second output branch is grounded through an electrolytic capacitor EC14, and an electrolytic capacitor EC13 is connected in parallel with the electrolytic capacitor EC14.

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