CN221283037U - Single-chip single-transformer isolation and non-isolation double-circuit output circuit - Google Patents
Single-chip single-transformer isolation and non-isolation double-circuit output circuit Download PDFInfo
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- CN221283037U CN221283037U CN202323139808.1U CN202323139808U CN221283037U CN 221283037 U CN221283037 U CN 221283037U CN 202323139808 U CN202323139808 U CN 202323139808U CN 221283037 U CN221283037 U CN 221283037U
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- 238000002955 isolation Methods 0.000 title abstract description 24
- 238000010521 absorption reaction Methods 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 69
- 238000004804 winding Methods 0.000 claims description 20
- 238000011084 recovery Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 230000002093 peripheral effect Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000009977 dual effect Effects 0.000 abstract description 3
- 230000000087 stabilizing effect Effects 0.000 description 6
- 235000008429 bread Nutrition 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
Abstract
The utility model discloses a single-chip single-transformer isolation and non-isolation double-circuit output circuit which comprises a U1 chip, a T2 transformer, an R2 safety resistor connected with the L end of a power supply, a Z1 piezoresistor with one end connected with the N end of the power supply and the other end connected with the R2 safety resistor, a D2 rectifier bridge with one end connected with the R2 safety resistor and the other end connected with the Z1 piezoresistor, a pi-type filter with one end connected with the D2 rectifier bridge and the other end connected with an RCD absorption loop, a D3 rectifier diode and a D4 rectifier diode connected with the T2 transformer. The utility model adopts one power chip and one transformer to construct an isolated and non-isolated double-circuit output power circuit, can output two paths of isolated and non-isolated direct current power supplies, is suitable for a power supply control system for dual power supply application of alternating current-direct current input isolation and non-isolated power supply, has simple peripheral circuit, can realize high-frequency operation, has high conversion efficiency and is beneficial to miniaturization design.
Description
Technical Field
The utility model relates to the technical field of circuits, in particular to a single-chip single-transformer isolation and non-isolation double-circuit output circuit.
Background
The isolation and non-isolation of the power supply are mainly aimed at switching power supplies, and the common views in the industry are as follows:
1. Isolation power: there is no direct electrical connection between the input and output loops of the power supply, an insulating high resistance state between the input and output, and no current loop.
2. Non-isolated power: there is a direct current loop between the input and the output, e.g. common ground between the input and the output.
Applications for isolated and non-isolated power supplies:
1. The power supply of the front stage of the system is generally an isolated power supply in order to improve the anti-interference performance and ensure the reliability.
2. The IC or part of the circuits in the circuit board are powered, and a non-isolated scheme is preferred from the aspects of cost performance and volume.
3. In the occasions with requirements for safety, such as AC-DC (alternating current-direct current) which is required to be connected with commercial power or medical power, an isolated power supply is required to ensure the personal safety, and an enhanced isolated power supply is also required in some occasions.
4. For power supply for remote industrial communications, to effectively reduce the effects of ground potential differences and wire coupling interference, isolated power supplies are typically used to individually power each communication node.
5. For the occasion with severe requirements on endurance by adopting battery power supply, non-isolated power supply is adopted.
When the existing isolated and non-isolated two-way output circuits are used, a plurality of circuits and units are often additionally arranged on the isolated and non-isolated two-way output circuits, so that the peripheral circuits are complex, the high-frequency work is not suitable, the conversion efficiency is low, and the miniaturized design is not facilitated.
For example, a linear voltage stabilizing circuit supporting conversion from isolated or non-isolated high-voltage alternating current to direct current is disclosed in publication No. CN211127608U, the circuit comprises a non-isolated application circuit which is arranged independently or is connected with the non-isolated application circuit, the non-isolated application circuit comprises a rectifying unit for rectifying sine wave alternating current voltage into steamed bread waveform, a low-voltage switch unit for detecting the voltage of the steamed bread waveform and intercepting a low-voltage part to be sent to a first output voltage circuit, an LDO voltage stabilizing unit connected with the low-voltage switch unit, and an output voltage setting unit connected with the LDO voltage stabilizing unit and capable of adjusting a fixed voltage output value, and the LDO voltage stabilizing unit for low-voltage differential linear voltage reduction is used for sending the stable direct current voltage to a second output voltage circuit; the isolation application circuit comprises an isolation transformer, a rectification filter unit and a third output voltage circuit, wherein the isolation transformer is connected with the LDO voltage stabilizing unit in parallel, and the DC inverter unit is sequentially connected with the rectification filter unit, and the rectification filter unit is connected with the third output voltage circuit.
The circuit of the patent consists of a plurality of circuits and units, and the peripheral circuit is complex, is not suitable for high-frequency work, has low conversion efficiency and is not beneficial to miniaturization design.
Therefore, it is necessary to invent a single-chip single-transformer isolated and non-isolated dual output circuit to solve the above-mentioned problems.
Disclosure of utility model
The utility model aims to provide a single-chip single-transformer isolation and non-isolation double-circuit output circuit, which solves the problems that when some existing isolation and non-isolation double-circuit output circuits in the technology are used, a plurality of circuits and units are often additionally arranged on the single-chip single-transformer isolation and non-isolation double-circuit output circuit, so that peripheral circuits are complex, are not suitable for high-frequency work, are poor in conversion efficiency and are also unfavorable for miniaturized design.
In order to achieve the above object, the present utility model provides the following technical solutions: the utility model provides a single-chip single transformer keeps apart and non-keeps apart double-circuit output circuit, including U1 chip, T2 transformer, with the R2 insurance resistance that power L holds to link to each other, one end links to each other with power N end and the other end links to each other with R2 insurance resistance Z1 piezo-resistor, one end links to each other with the D2 rectifier bridge that Z1 piezo-resistor links to each other, one end links to each other with D2 rectifier bridge and the other end links to each other with RCD rectifier diode, D3 rectifier diode and the D4 rectifier diode that RCD absorbs the return circuit and link to each other with T2 transformer, D4 rectifier diode winding ground wire and the primary winding sharing of T2 transformer, RCD absorbs the return circuit and links to each other with T2 transformer, T2 transformer links to each other with the D end of U1 chip, be connected with C3 electric capacity between VDD end and the S end of U1 chip, be connected with R7 resistance between the S end and the FB end of U1 chip, be connected with R6 resistance between FB end and the D4 rectifier diode of U1 chip.
Because the D3 rectifying diode winding ground wire is independent, the D4 rectifying diode winding ground wire is shared with the primary winding of the T2 transformer, the D3 rectifying diode outputs an isolated direct current power supply, and the D4 rectifying diode outputs a non-isolated direct current power supply.
Preferably, the pi-type filter is composed of an E2 polarity capacitor, an L1 inductor and an E3 polarity capacitor, and two ends of the L1 inductor are respectively connected with the E2 polarity capacitor and the E3 polarity capacitor.
The current is filtered by the pi-type filter and then is input into the T2 transformer, and the current passes through the primary winding of the T2 transformer to the drain electrode D pole of the built-in MOS of the U1 chip.
Preferably, one end of the E2 polarity capacitor is connected to the D2 rectifier bridge, and the ground wires of the E2 polarity capacitor and the E3 polarity capacitor are shared by the D2 rectifier bridge.
The input alternating current is rectified through a D2 rectifier bridge.
Preferably, the RCD absorption back route is composed of an R3 resistor, a C1 capacitor and a D6 diode, and the R3 resistor, the C1 capacitor and the D6 diode are connected with each other.
The RCD absorption loop is formed by the R3 resistor, the C1 capacitor and the D6 diode, so as to reduce the peak voltage generated by the leakage inductance of the T2 transformer at the moment of MOS switch.
Preferably, one end of the R3 resistor is connected with the E3 polar capacitor, one end of the C1 capacitor is connected with the T2 transformer, and one end of the D6 diode is connected with the D end of the U1 chip.
Preferably, one end of the D3 rectifying diode is connected with an R1 resistor, the other end of the D3 rectifying diode is connected with an E1 polar capacitor, the R1 resistor and the E1 polar capacitor are connected with each other, one end of the R6 resistor is connected with an E4 polar capacitor, the R1 resistor is 1K ohms, the specification of the E1 polar capacitor is 25v 220uf, and the specification of the E4 polar capacitor is 50v 4.7uf.
Preferably, the R2 fuse resistor is a winding resistor of 4.7r1w, the specification of the Z1 piezoresistor is 7D471K, the model of the D2 rectifier bridge is MB6S, the model of the D3 rectifier diode is ES1D, the model of the D4 rectifier diode is M7, the specification of the C3 capacitor is 50v 105, the R7 resistor is 2K ohms, and the R6 resistor is 15K ohms.
The R2 fuse resistor is used for inhibiting surge current and plays a role of a fuse, and the Z1 piezoresistor is used for inhibiting surge voltage.
Preferably, the specification of the E2 polarity capacitor and the E3 polarity capacitor is 400V 4.7uF, the specification of the L1 inductor is 3.3mH, the R3 resistor is 200K ohms, the specification of the C1 capacitor is 1KV102, and the model of the D6 diode is M7.
In the technical scheme, the utility model has the technical effects and advantages that:
The utility model adopts one power chip and one transformer to construct an isolated and non-isolated double-circuit output power circuit, can output two paths of isolated and non-isolated direct current power supplies, is suitable for a power supply control system for dual power supply application of alternating current-direct current input isolation and non-isolated power supply, has simple peripheral circuit, can realize high-frequency operation, has high conversion efficiency and is beneficial to miniaturization design.
Drawings
Fig. 1 is a circuit schematic of the present utility model.
Reference numerals illustrate:
1. A U1 chip; 2. a T2 transformer; 3. r2 is a safety resistor; 4. z1 piezoresistors; 5. d2 rectifier bridge; 6. d3 rectifier diode; 7. d4 rectifier diode; 8. c3 capacitance; 9. r7 resistance; 10. r6 resistance; 11. e2 polarity capacitance; 12. an L1 inductor; 13. e3 polarity capacitance; 14. r3 resistance; 15. c1 capacitance; 16. d6 diode; 17. r1 resistance; 18. e1 polarity capacitance; 19. and E4 is a polar capacitor.
Detailed Description
In order to make the technical scheme of the present utility model better understood by those skilled in the art, the present utility model will be further described in detail with reference to the accompanying drawings.
The utility model provides a single-chip single-transformer isolation and non-isolation double-circuit output circuit shown in fig. 1, which comprises a U1 chip 1, a T2 transformer 2, an R2 fuse resistor 3 connected with the L end of a power supply, a Z1 piezoresistor 4 connected with the N end of the power supply and the R2 fuse resistor 3 at one end, a D2 rectifier bridge 5 connected with the R2 fuse resistor 3 at the other end and the Z1 piezoresistor 4, a pi-type filter connected with the D2 rectifier bridge 5 at one end and an RCD absorption loop at the other end, a D3 rectifier diode 6 connected with the T2 transformer 2 and a D4 rectifier diode 7, wherein the winding ground wire of the D3 rectifier diode 6 is independent, the winding ground wire of the D4 rectifier diode 7 is shared with the primary winding of the T2 transformer 2, the RCD absorption loop is connected with the T2 transformer 2, the T2 transformer 2 is connected with the D end of the U1 chip 1, a C3 capacitor 8 is connected between the S end and the S end of the U1 chip 1, a R7 resistor 9 is connected between the S end and the FB end of the U1 chip 1, and a diode 10 is connected with the FB end of the U1 chip 1 and the FB 4 rectifier diode 7.
In one aspect of this embodiment, the pi-type filter is composed of an E2 polar capacitor 11, an L1 inductor 12 and an E3 polar capacitor 13, two ends of the L1 inductor 12 are respectively connected with the E2 polar capacitor 11 and the E3 polar capacitor 13, one end of the E2 polar capacitor 11 is connected with the D2 rectifier bridge 5, the ground wires of the E2 polar capacitor 11 and the E3 polar capacitor 13 are shared with the D2 rectifier bridge 5, the RCD absorption loop is composed of an R3 resistor 14, a C1 capacitor 15 and a D6 diode 16, the R3 resistor 14, the C1 capacitor 15 and the D6 diode 16 are connected with each other, one end of the R3 resistor 14 is connected with the E3 polar capacitor 13, one end of the C1 capacitor 15 is connected with the T2 transformer 2, one end of the D6 diode 16 is connected with the D end of the U1 chip 1, one end of the D3 rectifier diode 6 is connected with an R1 resistor 17, the other end of the D3 rectifier diode 6 is connected with an E1 polarity capacitor 18, an R1 resistor 17 and the E1 polarity capacitor 18 are connected with each other, one end of an R6 resistor 10 is connected with an E4 polarity capacitor 19, the R1 resistor 17 is 1K ohm, the E1 polarity capacitor 18 has the specification of 25V 220uF, the E4 polarity capacitor 19 has the specification of 50V 4.7uF, the R2 resistor 3 is a winding resistor of 4.7R 1W, the Z1 piezoresistor 4 has the specification of 7D471K, the D2 rectifier bridge 5 has the model MB6S, the D3 rectifier diode 6 has the model ES1D, the D4 rectifier diode 7 has the model M7, the C3 capacitor 8 has the specification of 50V 105, the R7 resistor 9 has the specification of 2K ohm, the R6 resistor 10 has the specification of 15K ohm, the specifications of the E2 polarity capacitor 11 and the E3 polarity capacitor 13 have the specification of 400V4.7uF, the L1 inductor 12 has the specification of 3.3mH, the R3 resistor 14 has the specification of 200K ohm, the C1 resistor 15 has the specification of 1D 1 diode 6D 6 and the model M6.
The working principle of the utility model is as follows:
Referring to fig. 1 of the specification, when an input voltage is applied to an AC, the voltage passes through an R2 fuse resistor 3 and a Z1 varistor, then the input AC is rectified through a D2 rectifier bridge 5, an E2 polarity capacitor 11, an L1 inductor 12 and an E3 polarity capacitor 13 form a pi-type filter, after rectification and filtration, the current passes through a primary winding of a T2 transformer 2 to a drain D pole of an MOS built-in to a U1 chip 1, a voltage stabilizing source built-in 5V to the U1 chip 1 charges a C3 capacitor 8, when the voltage reaches an operating voltage 5V of the U1 chip 1, a PWM signal is output inside the U1 chip 1 to turn on the built-in MOS, at this time, a primary winding loop of the T2 transformer 2 is conducted, an inductor current is linearly increased, the winding voltage is positive and negative, the primary winding stores energy, at this time, the D3 rectifier diode 6 and the D4 rectifier diode 7 are reversely biased according to a homonymous terminal relation, and at this time, the output voltage is maintained by the energy stored on the E1 polarity capacitor 18 and the E4 polarity capacitor 19. When the Feedback (FB) pin current of the U1 chip 1 is larger than a set value, the internal MOS is turned off, the same-name end of the primary winding of the T2 transformer 2 is reversely converted into upper negative and lower positive, the D3 rectifier diode 6 and the D4 rectifier diode 7 are positively biased to be conducted according to the same-name end relation and simultaneously charge a capacitor and supply power to a load, the ground wire of the D3 rectifier diode 6 is independent, the ground wire of the D4 rectifier diode 7 is shared with the primary side, so that the D3 rectifier diode 6 outputs an isolated direct current power supply, and the D4 rectifier diode 7 outputs a non-isolated direct current power supply.
Claims (8)
1. The utility model provides a single chip single transformer keeps apart and non-keeps apart double-circuit output circuit, including U1 chip (1), T2 transformer (2), R2 insurance resistance (3) that link to each other with power L end, one end links to each other with power N end and the other end links to each other with R2 insurance resistance (3) Z1 piezo-resistor (4), one end links to each other with R2 insurance resistance (3) and the other end links to each other with Z1 piezo-resistor (4) D2 rectifier bridge (5), one end links to each other with D2 rectifier bridge (5) and the other end with RCD absorbs pi type wave filter that the return circuit links to each other, D3 rectifier diode (6) and D4 rectifier diode (7) that link to each other with T2 transformer (2), its characterized in that: the winding ground wire of the D3 rectifier diode (6) is independent, the winding ground wire of the D4 rectifier diode (7) is shared by the primary winding of the T2 transformer (2), the RCD absorption loop is connected with the T2 transformer (2), the T2 transformer (2) is connected with the D end of the U1 chip (1), a C3 capacitor (8) is connected between the VDD end and the S end of the U1 chip (1), an R7 resistor (9) is connected between the S end and the FB end of the U1 chip (1), and an R6 resistor (10) is connected between the FB end of the U1 chip (1) and the D4 rectifier diode (7).
2. The single-chip single-transformer isolated and non-isolated two-way output circuit of claim 1, wherein: the pi-type filter consists of an E2 polar capacitor (11), an L1 inductor (12) and an E3 polar capacitor (13), wherein two ends of the L1 inductor (12) are respectively connected with the E2 polar capacitor (11) and the E3 polar capacitor (13).
3. The single-chip single-transformer isolated and non-isolated two-way output circuit of claim 2, wherein: one end of the E2 polarity capacitor (11) is connected with the D2 rectifier bridge (5), and the ground wires of the E2 polarity capacitor (11) and the E3 polarity capacitor (13) are shared with the D2 rectifier bridge (5).
4. The single-chip single-transformer isolated and non-isolated two-way output circuit of claim 2, wherein: the RCD absorption recovery route is composed of an R3 resistor (14), a C1 capacitor (15) and a D6 diode (16), and the R3 resistor (14), the C1 capacitor (15) and the D6 diode (16) are connected with each other in pairs.
5. The single-chip single-transformer isolated and non-isolated two-way output circuit of claim 4, wherein: one end of the R3 resistor (14) is connected with the E3 polar capacitor (13), one end of the C1 capacitor (15) is connected with the T2 transformer (2), and one end of the D6 diode (16) is connected with the D end of the U1 chip (1).
6. The single-chip single-transformer isolated and non-isolated two-way output circuit of claim 1, wherein: the LED lamp is characterized in that one end of the D3 rectifier diode (6) is connected with an R1 resistor (17), the other end of the D3 rectifier diode (6) is connected with an E1 polarity capacitor (18), the R1 resistor (17) and the E1 polarity capacitor (18) are connected with each other, one end of the R6 resistor (10) is connected with an E4 polarity capacitor (19), the R1 resistor (17) is 1K ohms, the specification of the E1 polarity capacitor (18) is 25V 220uF, and the specification of the E4 polarity capacitor (19) is 50V 4.7uF.
7. The single-chip single-transformer isolated and non-isolated two-way output circuit of claim 1, wherein: the R2 safety resistor (3) is a winding resistor of 4.7R1W, the specification of the Z1 piezoresistor (4) is 7D471K, the model of the D2 rectifier bridge (5) is MB6S, the model of the D3 rectifier diode (6) is ES1D, the model of the D4 rectifier diode (7) is M7, the specification of the C3 capacitor (8) is 50V 105, the R7 resistor (9) is 2K ohms, and the R6 resistor (10) is 15K ohms.
8. The single-chip single-transformer isolated and non-isolated two-way output circuit of claim 4, wherein: the specifications of the E2 polar capacitor (11) and the E3 polar capacitor (13) are 400V 4.7uF, the specification of the L1 inductor (12) is 3.3mH, the R3 resistor (14) is 200K ohms, the specification of the C1 capacitor (15) is 1KV102, and the model of the D6 diode (16) is M7.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221283037U true CN221283037U (en) | 2024-07-05 |
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