CN205160385U - Power converter based on printed circuit board - Google Patents

Power converter based on printed circuit board Download PDF

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Publication number
CN205160385U
CN205160385U CN201521017655.6U CN201521017655U CN205160385U CN 205160385 U CN205160385 U CN 205160385U CN 201521017655 U CN201521017655 U CN 201521017655U CN 205160385 U CN205160385 U CN 205160385U
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China
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circuit
circuit board
resistance
printed circuit
electric capacity
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CN201521017655.6U
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Chinese (zh)
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高宜国
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Wuhan Sitanda Electronic Technology Co Ltd
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Wuhan Sitanda Electronic Technology Co Ltd
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Abstract

The utility model relates to a power converter based on printed circuit board, including casing and printed circuit board, printed circuit board fixes in the casing, last power connecting seat, at least one power source and at least one USB interface of being equipped with of printed circuit board, and the power connecting seat passes through the power cord to be connected with external power source, has laid power switching circuit on printed circuit board, and every power source all is connected with power switching circuit, and power switching circuit includes printed circuit board 0, excess temperature protection circuit and USB printed circuit board 1. The utility model discloses a power converter based on printed circuit board, with a plurality of integrated circuit on printed circuit board, the integrated level is high, the scheme is nimble, simple process. In addition, except normal power source to domestic appliance provide voltage, can also charge to direct current low voltage power supply electronic product through the USB interface. The utility model discloses a power converter, the quality is reliable, and is small, and intelligent environmental protection is energy -efficient.

Description

A kind of power supply changeover device based on printed circuit board
Technical field
The utility model relates to power technique fields, particularly relates to a kind of power supply changeover device based on printed circuit board.
Background technology
Along with the raising of quality of life, the application of electronic product is more and more extensive, and the demand that people charge to electronic product is more and more higher, it is also proposed corresponding requirement to power supply changeover device.Using the power supply changeover device of USB charging inlet, is the effective way improving electronic product charging.Although the power supply changeover device of normal domestic use provides household electrical appliance interface, because household electrical appliance interface is single, do not have USB charging inlet, household electrical appliance and electronic product charging can not simultaneously electricity consumptions, and underaction, the experience of user is also poor.Further, along with the activity in production of the mankind strengthens, Changes in weather is more and more faster, and Thunderstorm Weather also gets more and more, and household electrical appliance and electronic product are also more and more easily subject to the impact of Thunderstorm Weather.In addition, household electrical appliance and electronic product price high, people also need the power supply changeover device of a lightning protection to protect the high electrical equipment of price and electronic product.Therefore, existing power supply changeover device is for electronic product and household electrical appliance or the more scene of office electrical equipment, and the effect that can play is more and more limited.For this reason, need to develop a kind of power supply changeover device that can overcome above-mentioned defect.
Summary of the invention
Technical problem to be solved in the utility model is for above-mentioned the deficiencies in the prior art, provides a kind of power supply changeover device based on printed circuit board.
The technical scheme that the utility model solves the problems of the technologies described above is as follows: a kind of power supply changeover device based on printed circuit board, comprise housing and printed circuit board, described printed circuit board is fixed in described housing, described printed circuit board is provided with electrical power connection block, at least one power interface and at least one USB interface, described electrical power connection block is connected with external power source by power line, described printed circuit board is laid with power-switching circuit, and each described power interface is all connected described power-switching circuit with described power-switching circuit comprises overload protecting circuit, thermal-shutdown circuit and USB charging circuit, described electrical power connection block, overload protecting circuit, thermal-shutdown circuit and USB charging circuit are connected by power line successively, described USB interface is connected with described USB charging circuit.
The beneficial effects of the utility model are: a kind of power supply changeover device based on printed circuit board of the present utility model, and be integrated on a printed circuit board by multiple circuit, integrated level is high, and scheme is flexible, and technique is simple.In addition, except normal power interface provides voltage to household electrical appliance, can also be charged to DC low-voltage powered electronic product by USB interface.Power supply changeover device of the present utility model, reliable in quality, volume is little, intelligent environment protection, energy-efficient.
On the basis of technique scheme, the utility model can also do following improvement:
Further: described overload protecting circuit comprises overload light Lamp and overcurrent protection switch K1; the positive pole of described overload light Lamp is connected with the live wire of power line by described overcurrent protection switch K1; negative pole is connected with the zero line of power line; and described overcurrent protection switch K1 is both as the master control switch of power supply changeover device, also as disconnect during overload.
The beneficial effect of above-mentioned further scheme is: can when overload appears in circuit by described overload light Lamp and overcurrent protection switch K1; overcurrent protection switch K1 disconnects automatically; cut off circuit; circuit or household electrical appliance are avoided to burn; and by described overload light Lamp reminding user; easy to use, security performance is high.
Further: described thermal-shutdown circuit comprises temperature control insurance F1B-F3B, described temperature control insurance F1B-F3B is connected on the live wire of power line between described overload protecting circuit and USB charging circuit, zero line and ground wire respectively, for automatically fusing when temperature is too high.
The beneficial effect of above-mentioned further scheme is: by described temperature control insurance F1-F3, automatically fuse after can reaching uniform temperature when line work, cut off circuit, prevent because circuit local temperature is too high and cause and burn or cause fire, its potential safety hazard used of further reduction, guarantees the fail safe that user uses.
Further: also to comprise an EMC circuit, a described EMC circuit connected in series is between described overload protecting circuit and thermal-shutdown circuit.A described EMC circuit comprises electric capacity CX1 and common mode inductance L1,1, No. 3 pin of described electric capacity CX1 connects one to one with the positive pole of described indicator light Lamp and negative pole respectively, described common mode inductance L1 is connected between 1, No. 3 pin of described common mode inductance L1, and 2, No. 4 pins of described common mode inductance L1 insure that the input of F1, F2 is corresponding to be connected respectively with described temperature control.
The beneficial effect of above-mentioned further scheme is: can reduce electromagnetic interference by a described EMC circuit, reduces electromagnetic radiation, reduces the harm to health, intelligent environment protection.
Further: also to comprise lightning-protection surge protection circuit, described lightning-protection surge protection circuit is connected with described thermal-shutdown circuit.Described lightning-protection surge protection circuit comprises piezo-resistance RV1-RV5; described piezo-resistance RV1, piezo-resistance RV2 and piezo-resistance RV3 are connected in parallel between the output of described temperature control insurance F1, F2, and the two ends of described piezo-resistance RV1B are connected with the ground wire of power line with piezo-resistance RV5 respectively by described piezo-resistance RV4.
The beneficial effect of above-mentioned further scheme is: by described lightning-protection surge protection circuit can prevent described power supply changeover device be struck by lightning or surge time be damaged, effectively absorb burst thunderbolt or the huge energy of surge, avoid with protective device impaired.
Further: also to comprise lightning-protection surge indicating circuit, described lightning-protection surge indicating circuit is connected with described thermal-shutdown circuit.Described lightning-protection surge indicating circuit comprises resistance R1 and LED 1, and described resistance R1 and LED 1 are connected on described temperature control insures between the output of F1, F2.
The beneficial effect of above-mentioned further scheme is: by described lightning-protection surge indicating circuit can more intuitively display circuit no have be struck by lightning or occurred surge; when circuit is struck by lightning or occur surge; the voltage at the piezo-resistance RV1-RV5 two ends in described lightning-protection surge protection circuit reduces; LED 1 is extinguished, plays warning function.
Further: also to comprise ground connection mistake indicating circuit, described ground connection mistake indicating circuit is connected with described thermal-shutdown circuit.Described ground connection mistake indicating circuit comprises backward diode D2, electric capacity C2, electric capacity C3, light-emitting diode D5, resistance R3, resistance R4, resistance R6 and triode Q1, the output that F1 is insured in positive pole and the described temperature control of described backward diode D2 is connected, negative pole is connected with the positive pole of described electric capacity C2, and the positive pole of described electric capacity C2 is also connected with the ground wire of power line by described resistance R4, the output that F2 is insured in negative pole and the described temperature control of described electric capacity C2 is connected, one end of described resistance R6 is connected with the positive pole of described electric capacity C2, the other end is connected with the positive pole of described electric capacity C3, the negative pole of described electric capacity C3 is connected with the negative pole of described electric capacity C2, the positive pole of described electric capacity C3 is connected with the positive pole of light-emitting diode D5, the negative pole of described light-emitting diode D5 is connected with the collector electrode of described triode Q1, the emitter of described triode Q1 is connected with the negative pole of described electric capacity C3, the base stage of described triode Q1 is connected with the ground wire of power line by described resistance R3.
The beneficial effect of above-mentioned further scheme is: can be lighted by described light-emitting diode D5 when circuit ground breaks down by described ground connection mistake indicating circuit, facilitate reminding user, improves the security performance of circuit further.
Further: described USB charging circuit comprises the 2nd EMC circuit, circuit of synchronous rectification, PFM/PWM control circuit, feedback circuit and and the electric current adapter circuit that connect one to one identical with described USB interface quantity; described 2nd EMC circuit is connected with described thermal-shutdown circuit; and described 2nd EMC circuit, circuit of synchronous rectification, PFM/PWM control circuit, feedback circuit are connected successively, each described electric current adapter circuit is all connected with described feedback circuit.
The beneficial effect of above-mentioned further scheme is: external dc low-voltage electronic equipment is accessed described USB charging circuit by described USB interface, can charge to outside low-voltage electronic equipment eaily, and described USB charging circuit adopts general direct current 5V voltage charging, versatility is very strong, convenient and practical.
Further: described USB charging circuit also comprises filter circuit, described filter circuit comprises diode D4, electric capacity C6, electric capacity C7 and resistance R14, the positive pole of described diode D4 is connected with described PFM/PWM control circuit, negative pole is by described electric capacity C6 ground connection, and described electric capacity C7 and resistance R14 is all connected in parallel on described electric capacity C6 two ends.
The beneficial effect of above-mentioned further scheme is: can be filtered the clutter in circuit when charging by described filter circuit, reduce the alternating component in direct voltage, retain its flip-flop, output voltage ripple coefficient is reduced, waveform becomes smoother, guarantees the work that circuit is more stable.
Further: described power interface is welded on described printed circuit board by copper plug.
The beneficial effect of above-mentioned further scheme is: can be switched on power by described copper plug by household electrical appliance eaily by the way, and often, long service life, structure is simple, with low cost, and electrical contact is stablized in plug.
Accompanying drawing explanation
Fig. 1 is a kind of power converter structure schematic diagram based on printed circuit board of the utility model embodiment one;
Fig. 2 is a kind of based on overload protecting circuit equivalent circuit diagram in the power supply changeover device of printed circuit board of the utility model embodiment one;
Fig. 3 is a kind of based on thermal-shutdown circuit figure in the power supply changeover device of printed circuit board of the utility model embodiment one;
Fig. 4 is a kind of based on USB charging circuit configuration schematic diagram in the power supply changeover device of printed circuit board of the utility model embodiment one;
Fig. 5 is of the present utility model a kind of based on the 2nd EMC circuit diagram in the power supply changeover device of printed circuit board;
Fig. 6 is of the present utility model a kind of based on circuit of synchronous rectification figure in the power supply changeover device of printed circuit board;
Fig. 7 is of the present utility model a kind of based on PFM/PWM control circuit figure in the power supply changeover device of printed circuit board;
Fig. 8 is of the present utility model a kind of based on feedback circuit figure in the power supply changeover device of printed circuit board;
Fig. 9 is of the present utility model a kind of based on electric current adapter circuit figure in the power supply changeover device of printed circuit board;
Figure 10 is of the present utility model a kind of based on filter circuit figure in the power supply changeover device of printed circuit board;
Figure 11 is a kind of based on thermal-shutdown circuit figure in the power supply changeover device of printed circuit board of the utility model embodiment two;
Figure 12 is a kind of based on an EMC circuit diagram in the power supply changeover device of printed circuit board of the utility model embodiment two;
Figure 13 is a kind of based on lightning-protection surge protection circuit figure in the power supply changeover device of printed circuit board of the utility model embodiment two;
Figure 14 is a kind of based on lightning-protection surge indicating circuit figure in the power supply changeover device of printed circuit board of the utility model embodiment two;
Figure 15 is a kind of based on ground connection mistake indicating circuit figure in the power supply changeover device of printed circuit board of the utility model embodiment two.
In accompanying drawing, the list of parts representated by each label is as follows:
1100, electrical power connection block; 1200, overload protecting circuit; 1300, thermal-shutdown circuit; 1400, an EMC circuit; 1500, lightning-protection surge protection circuit; 1600, lightning-protection surge indicating circuit, 1700, ground connection mistake indicating circuit, 1800, power interface; 1900, USB charging circuit; 1910, the 2nd EMC circuit, 1920, circuit of synchronous rectification, 1930, PFM/PWM control circuit; 1940, feedback circuit; 1950, electric current adapter circuit, 1960, USB interface, 1970, filter circuit.
Embodiment
Be described principle of the present utility model and feature below in conjunction with accompanying drawing, example, only for explaining the utility model, is not intended to limit scope of the present utility model.
As shown in Figure 1, a kind of power converter structure schematic diagram based on printed circuit board, comprise housing and printed circuit board, described printed circuit board is fixed in described housing, described printed circuit board is provided with electrical power connection block 1100, at least one power interface 1800 and at least one usb 1 960, described electrical power connection block 1100 is connected with external power source by power line, described printed circuit board is laid with power-switching circuit, and each described power interface 1800 is all connected with described power-switching circuit.
Wherein, described power-switching circuit comprises overload protecting circuit 1200, thermal-shutdown circuit 1300 and USB charging circuit 1900; described electrical power connection block 1100, overload protecting circuit 1200, thermal-shutdown circuit 1300 and USB charging circuit 1900 are connected by power line successively, and described usb 1 960 is connected with described USB charging circuit 1900.
In the present embodiment; be illustrated in figure 2 described overload protecting circuit 1200 equivalent circuit diagram; described overload protecting circuit 1200 is encapsulated in three end rocker type switches; comprise overload light Lamp and overcurrent protection switch K1; the positive pole of described overload light Lamp is connected with the live wire of power line by described overcurrent protection switch K1; negative pole is connected with the zero line of power line; and described overcurrent protection switch K1 is both as the master control switch of power supply changeover device; also as disconnect during overload; a switch two kinds of purposes, easy to use.Can when there is overload in circuit by described overload light Lamp and overcurrent protection switch K1, overcurrent protection switch K1 disconnects automatically, cuts off circuit; circuit or household electrical appliance are avoided to burn; and by described overload light Lamp reminding user, easy to use, security performance is high.
In the present embodiment; as shown in Figure 3; described thermal-shutdown circuit 1300 comprises temperature control insurance F1-F3; described temperature control insurance F1-F3 is connected on the live wire of power line between described overload protecting circuit 1200 and USB charging circuit 1900, zero line and ground wire respectively, for automatically fusing when temperature is too high.By described temperature control insurance F1-F3, automatically fuse after can reaching uniform temperature when line work, cut off circuit, prevent due to circuit because local temperature is too high and cause and burn or cause fire, its potential safety hazard used of further reduction, guarantees the fail safe that user uses.
In the present embodiment, as shown in Figure 4, described USB charging circuit 1900 comprises the 2nd EMC circuit 1910, circuit of synchronous rectification 1920, PFM/PWM control circuit 1930, feedback circuit 1940 and and the electric current adapter circuit 1950 that connect one to one identical with described usb 1 960 quantity, described 2nd EMC circuit 1910 is connected with described thermal-shutdown circuit 1300, and described 2nd EMC circuit 1910, circuit of synchronous rectification 1920, PFM/PWM control circuit 1930, feedback circuit 1940 is connected successively, each described electric current adapter circuit 1950 is all connected with described feedback circuit 1940.External dc low-voltage electronic equipment is accessed described USB charging circuit 1900 by described usb 1 960, can charge to outside low-voltage electronic equipment eaily, and described USB charging circuit adopts general direct current 5V voltage charging, versatility is very strong, convenient and practical.
Wherein, as shown in Figure 5; described 2nd EMC circuit 1910 comprises fuse F4, electric capacity CX2, common mode inductance L2; the output that 1, No. 3 pin of described common mode inductance L2 insures F1, F2 with temperature control in described thermal-shutdown circuit 1300 is respectively connected; described electric capacity CX2 is connected in parallel between 1, No. 3 pin of described common mode inductance L2, and described fuse F4 is connected on No. 1 pin of described common mode inductance L2 and described temperature control is insured on the live wire between F1.Can electromagnetic interference be reduced by described 2nd EMC circuit 1910, reduce electromagnetic radiation, reduce the harm to health, intelligent environment protection.
As shown in Figure 6, described circuit of synchronous rectification 1920 comprises rectifier BD1 and electric capacity C1,2 pins of described rectifier BD1 are connected with 4 pins of described common mode inductance L2, No. 3 pins of described rectifier BD1 are connected with No. 2 pins of described common mode inductance L2, and described electric capacity C1 is connected in parallel between No. 1 pin of described rectifier BD1 and No. 4 pins, No. 1 pin of described rectifier BD1 is also connected with described PFM/PWM control circuit 1930.Convert alternating voltage to direct voltage by described rectifier BD1, after being convenient to follow-up step-down, carry out USB charging to external electronic device.
As shown in Figure 7, described PFM/PWM control circuit 1930 comprises transformer T1, Switching Power Supply control chip U1, resistance R5, electric capacity C4, electric capacity C18, diode D3, No. 1 pin of described transformer T1 is connected with No. 1 pin of described rectifier BD1, No. 2 pins respectively with 5 of described Switching Power Supply control chip U1, 6, 7, No. 8 pins connect, 4, No. 6 pin ground connection, described diode D3 and resistance R5 is connected between No. 1 pin of described transformer T1 and No. 2 pins, and described electric capacity C18 is connected in parallel on described resistance R5 two ends, 1 of described Switching Power Supply control chip U1, No. 2 equal ground connection of pin, No. 4 pins are by described electric capacity C4 ground connection.
As shown in Figure 8, described feedback circuit 1940 comprises optocoupler U3, resistance R2, electric capacity C8, resistance R36, resistance R21, resistance R22, electric capacity C24, resistance R35 and voltage-stabiliser tube U2, described resistance R22, resistance R21 and electric capacity C24 is in sequential series, and be connected in parallel on 1 of described optocoupler U3 with described resistance 36, between No. 2 pins, No. 3 pins of described optocoupler U3 are by described resistance R2 and electric capacity C8 ground connection, and described resistance R2 is connected with No. 3 pins of described Switching Power Supply control chip U1 with the common port of electric capacity C8, No. 4 pins of described optocoupler U3 are connected with No. 4 pins of described Switching Power Supply control chip U1, the common port of described resistance R21 and electric capacity C24 is by described resistance R35 ground connection, No. 2 pins of described optocoupler U3 are also connected with No. 3 pins of described voltage-stabiliser tube U2, No. 2 pin ground connection of described voltage-stabiliser tube U2, No. 1 pin is connected with the common port of resistance R21 and electric capacity C24.Here, described voltage-stabiliser tube U2 employing model is the voltage stabilizing chip of TL431.
As shown in Figure 9, described electric current adapter circuit 1950 comprises resistance R10, resistance R23-R26, described resistance R23-26 connects successively and forms closed circuit, and the common end grounding of described resistance R23 and resistance 24, described resistance R10 is connected between the common port of described resistance R23 and resistance R26 and described resistance R24 and the common port of resistance R25, and the two ends of described resistance R10 connect with 2, No. 3 pins of corresponding described usb 1 960 respectively, No. 1 pin of described usb 1 960 is connected with No. 10 pins of described transformer T1.
Preferably, as shown in Figure 10, described USB charging circuit 1900 also comprises filter circuit 1970, described filter circuit 1970 comprises diode D4, electric capacity C6, electric capacity C7 and resistance R14, the positive pole of described diode D4 is connected with No. 10 pins of transformer T1 described in described PFM/PWM control circuit 1930, negative pole is by described electric capacity C6 ground connection, and described electric capacity C7 and resistance R14 is all connected in parallel on described electric capacity C6 two ends.Can be filtered the clutter in circuit when charging by described filter circuit 1970, reduce the alternating component in direct voltage, retain its flip-flop, output voltage ripple coefficient is reduced, and waveform becomes smoother, guarantees the work that circuit is more stable.
In the present embodiment, described power interface 1800 is welded on described printed circuit board by copper plug.Can be switched on power by described copper plug by household electrical appliance eaily by the way, often, long service life, structure is simple, with low cost, and electrical contact is stablized in plug.
Preferably; as shown in figure 11; a kind of power supply changeover device based on printed circuit board described in the utility model also comprises an EMC circuit 1400; a described EMC circuit 1400 is connected between described overload protecting circuit 1200 and thermal-shutdown circuit 1300; for reducing electromagnetic interference, reduce electromagnetic radiation.
As shown in figure 12, a described EMC circuit 1400 comprises electric capacity CX1 and common mode inductance L1,1, No. 3 pin of described common mode inductance L1 connects one to one with the positive pole of described indicator light Lamp and negative pole respectively, described common mode inductance L1 is connected between 1, No. 3 pin of described common mode inductance L1, and 2, No. 4 pins of described common mode inductance L1 insure that the input of F1, F2 is corresponding to be connected respectively with described temperature control.Can electromagnetic interference be reduced by a described EMC circuit 1400, reduce electromagnetic radiation, reduce the harm to health, intelligent environment protection.
Preferably, a kind of power supply changeover device based on printed circuit board of the present utility model also comprises lightning-protection surge protection circuit 1500, and described lightning-protection surge protection circuit 1500 is connected with described thermal-shutdown circuit 1300.
As shown in figure 13; described lightning-protection surge protection circuit 1500 comprises piezo-resistance RV1-RV5; described piezo-resistance RV1, piezo-resistance RV2 and piezo-resistance RV3 are connected in parallel between the output of described temperature control insurance F1, F2, and the two ends of described piezo-resistance RV1B are connected with the ground wire of power line with piezo-resistance RV5 respectively by described piezo-resistance RV4.By described lightning-protection surge protection circuit 1500 can prevent described power supply changeover device be struck by lightning or surge time be damaged, effectively absorb burst thunderbolt or the huge energy of surge, avoid with protective device impaired.
Preferably, a kind of power supply changeover device based on printed circuit board of the present utility model also comprises lightning-protection surge indicating circuit 1600, and described lightning-protection surge indicating circuit 1600 is connected with described thermal-shutdown circuit 1300.
As shown in figure 14, described lightning-protection surge indicating circuit 1600 comprises resistance R1 and LED 1, and described resistance R1 and LED 1 are connected on described temperature control insures between the output of F1, F2.By described lightning-protection surge indicating circuit 1600 can more intuitively display circuit no have be struck by lightning or occurred surge; when circuit is struck by lightning or occur surge; the voltage at the piezo-resistance RV1-RV5 two ends in described lightning-protection surge protection circuit 1500 reduces; LED 1 is extinguished, plays warning function.
Preferably, a kind of power supply changeover device based on printed circuit board of the present utility model also comprises ground connection mistake indicating circuit 1700, and described ground connection mistake indicating circuit 1700 is connected with described thermal-shutdown circuit 1300.
As shown in figure 15, described ground connection mistake indicating circuit 1700 comprises backward diode D2, electric capacity C2, electric capacity C3, light-emitting diode D5, resistance R3, resistance R4, resistance R6 and triode Q1, the output that F1 is insured in positive pole and the described temperature control of described backward diode D2 is connected, negative pole is connected with the positive pole of described electric capacity C2, and the positive pole of described electric capacity C2 is also connected with the ground wire of power line by described resistance R4, the output that F2 is insured in negative pole and the described temperature control of described electric capacity C2 is connected, one end of described resistance R6 is connected with the positive pole of described electric capacity C2, the other end is connected with the positive pole of described electric capacity C3, the negative pole of described electric capacity C3 is connected with the negative pole of described electric capacity C2, the positive pole of described electric capacity C3 is connected with the positive pole of light-emitting diode D5, the negative pole of described light-emitting diode D5 is connected with the collector electrode of described triode Q1, the emitter of described triode Q1 is connected with the negative pole of described electric capacity C3, the base stage of described triode Q1 is connected with the ground wire of power line by described resistance R3.Can be lighted by described light-emitting diode D5 when circuit ground breaks down by described ground connection mistake indicating circuit 1700, facilitate reminding user, improve the security performance of circuit further.
A kind of power supply changeover device based on printed circuit board of the present utility model, be integrated on a printed circuit board by multiple circuit, integrated level is high, and scheme is flexible, and technique is simple.In addition, except normal power interface provides voltage to household electrical appliance, can also be charged to DC low-voltage powered electronic product by USB interface.Power supply changeover device of the present utility model, reliable in quality, flexible configuration, intelligent environment protection, energy-efficient.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.

Claims (10)

1. the power supply changeover device based on printed circuit board, it is characterized in that: comprise housing and printed circuit board, described printed circuit board is fixed in described housing, described printed circuit board is provided with electrical power connection block (1100), at least one power interface (1800) and at least one USB interface (1960), described electrical power connection block (1100) is connected with external power source by power line, described printed circuit board is laid with power-switching circuit, and each described power interface (1800) is all connected with described power-switching circuit;
Described power-switching circuit comprises overload protecting circuit (1200), thermal-shutdown circuit (1300) and USB charging circuit (1900); described electrical power connection block (1100), overload protecting circuit (1200), thermal-shutdown circuit (1300) and USB charging circuit (1900) are connected by power line successively, and described USB interface (1960) is connected with described USB charging circuit (1900).
2. a kind of power supply changeover device based on printed circuit board according to claim 1; it is characterized in that: described overload protecting circuit (1200) comprises overload light Lamp and overcurrent protection switch K1; the positive pole of described overload light Lamp is connected with the live wire of power line by described overcurrent protection switch K1; negative pole is connected with the zero line of power line; and described overcurrent protection switch K1 is both as the master control switch of power supply changeover device, also as disconnect during overload.
3. a kind of power supply changeover device based on printed circuit board according to claim 2; it is characterized in that: described thermal-shutdown circuit (1300) comprises temperature control insurance F1-F3; described temperature control insurance F1-F3 is connected on the live wire of power line between described overload protecting circuit (1200) and USB charging circuit (1900), zero line and ground wire respectively, for automatically fusing when temperature is too high.
4. a kind of power supply changeover device based on printed circuit board according to claim 3, it is characterized in that: also comprise an EMC circuit (1400), a described EMC circuit (1400) is connected between described overload protecting circuit (1200) and thermal-shutdown circuit (1300), for reducing electromagnetic interference, reduce electromagnetic radiation;
A described EMC circuit (1400) comprises electric capacity CX1 and common mode inductance L1,1, No. 3 pin of described common mode inductance L1 connects one to one with the positive pole of described indicator light Lamp and negative pole respectively, described electric capacity CX1 is connected between 1, No. 3 pin of described common mode inductance L1, and 2, No. 4 pins of described common mode inductance L1 insure that the input of F1, F2 is corresponding to be connected respectively with described temperature control.
5. a kind of power supply changeover device based on printed circuit board according to claim 4, it is characterized in that: also comprise lightning-protection surge protection circuit (1500), described lightning-protection surge protection circuit (1500) is connected with described thermal-shutdown circuit (1300);
Described lightning-protection surge protection circuit (1500) comprises piezo-resistance RV1-RV5; described piezo-resistance RV1, piezo-resistance RV2 and piezo-resistance RV3 are connected in parallel between the output of described temperature control insurance F1, F2, and the two ends of described piezo-resistance RV1 are connected with the ground wire of power line with piezo-resistance RV5 respectively by described piezo-resistance RV4.
6. a kind of power supply changeover device based on printed circuit board according to claim 4, it is characterized in that: also comprise lightning-protection surge indicating circuit (1600), described lightning-protection surge indicating circuit (1600) is connected with described thermal-shutdown circuit (1300);
Described lightning-protection surge indicating circuit (1600) comprises resistance R1 and LED 1, and described resistance R1 and LED 1 are connected on described temperature control insures between the output of F1, F2.
7. a kind of power supply changeover device based on printed circuit board according to claim 4, it is characterized in that: also comprise ground connection mistake indicating circuit (1700), described ground connection mistake indicating circuit (1700) is connected with described thermal-shutdown circuit (1300);
Described ground connection mistake indicating circuit (1700) comprises backward diode D2, electric capacity C2, electric capacity C3, light-emitting diode D5, resistance R3, resistance R4, resistance R6 and triode Q1, the output that F1 is insured in positive pole and the described temperature control of described backward diode D2 is connected, negative pole is connected with the positive pole of described electric capacity C2, and the positive pole of described electric capacity C2 is also connected with the ground wire of power line by described resistance R4, the output that F2 is insured in negative pole and the described temperature control of described electric capacity C2 is connected, one end of described resistance R6 is connected with the positive pole of described electric capacity C2, the other end is connected with the positive pole of described electric capacity C3, the negative pole of described electric capacity C3 is connected with the negative pole of described electric capacity C2, the positive pole of described electric capacity C3 is connected with the positive pole of light-emitting diode D5, the negative pole of described light-emitting diode D5 is connected with the collector electrode of described triode Q1, the emitter of described triode Q1 is connected with the negative pole of described electric capacity C3, the base stage of described triode Q1 is connected with the ground wire of power line by described resistance R3.
8. a kind of power supply changeover device based on printed circuit board according to claim 4, it is characterized in that: described USB charging circuit (1900) comprises the 2nd EMC circuit (1910), circuit of synchronous rectification (1920), PFM/PWM control circuit (1930), feedback circuit (1940) and and the electric current adapter circuit (1950) that connect one to one identical with described USB interface (1960) quantity, described 2nd EMC circuit (1910) is connected with described thermal-shutdown circuit (1300), and described 2nd EMC circuit (1910), circuit of synchronous rectification (1920), PFM/PWM control circuit (1930), feedback circuit (1940) is connected successively, each described electric current adapter circuit (1950) is all connected with described feedback circuit (1940).
9. a kind of power supply changeover device based on printed circuit board according to claim 8, it is characterized in that: described USB charging circuit (1900) also comprises filter circuit (1970), described filter circuit (1970) comprises diode D4, electric capacity C6, electric capacity C7 and resistance R14, the positive pole of described diode D4 is connected with described PFM/PWM control circuit (1930), negative pole is by described electric capacity C6 ground connection, and described electric capacity C7 and resistance R14 is all connected in parallel on described electric capacity C6 two ends.
10. a kind of power supply changeover device based on printed circuit board according to claim 9, is characterized in that: described power interface (1800) is welded on described printed circuit board by copper plug.
CN201521017655.6U 2015-12-09 2015-12-09 Power converter based on printed circuit board Expired - Fee Related CN205160385U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105406733A (en) * 2015-12-09 2016-03-16 武汉思坦达电子科技有限公司 Printed circuit board-based power converter
US10411486B2 (en) 2016-09-09 2019-09-10 Delta Electronics (Thailand) Public Company Limited Power conversion device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105406733A (en) * 2015-12-09 2016-03-16 武汉思坦达电子科技有限公司 Printed circuit board-based power converter
US10411486B2 (en) 2016-09-09 2019-09-10 Delta Electronics (Thailand) Public Company Limited Power conversion device

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