CN203827185U - Switching power supply circuit being compatible with various communication command and supporting multistage buck-boost - Google Patents
Switching power supply circuit being compatible with various communication command and supporting multistage buck-boost Download PDFInfo
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- CN203827185U CN203827185U CN201420231400.9U CN201420231400U CN203827185U CN 203827185 U CN203827185 U CN 203827185U CN 201420231400 U CN201420231400 U CN 201420231400U CN 203827185 U CN203827185 U CN 203827185U
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Abstract
The utility model discloses a switching power supply circuit being compatible with various communication commands and supporting multistage buck-boost. The switching power supply circuit comprises an AC input rectifying and EMI filtering circuit, a flyback switching circuit, a control circuit, a power supply circuit, an output rectifying and filtering circuit, a feedback sampling circuit, an overshoot absorption circuit, a command protocol receiving and coding circuit and a command transmission circuit, wherein an input end of the AC input rectifying and EMI filtering circuit is connected with an AC power supply, and an output end is connected with an input end of the power supply circuit; an input end of the flyback switching circuit is connected with an output end of the control circuit and an output end of the overshoot absorption circuit, and an output end is connected with an input end of the output rectifying and filtering circuit; and an input end of the control circuit is connected with an output end of the power supply circuit and an input end of the feedback sampling circuit, and the output end is connected with the input end of the flyback switching circuit, an input end of the command protocol receiving and coding circuit and an input end of the command transmission circuit.
Description
Technical field
The utility model relates to circuit field, relates more specifically to a kind of switching power circuit of supporting to receive multiple different communication instruction and the adjustable feature of output voltage that possesses.
Background technology
At present, the Switching Power Supply charger of conventional design compatible a kind of communication protocol only on market, thus can only be a kind of portable set charging of same type.As example, Fig. 1 shows the block diagram of only supporting a kind of switch power supply system of protocol scheme in prior art.As described in Figure 1, for example, in only supporting the switch power supply system of a kind of protocol scheme category-A communication instruction of current signal (such as), category-A portable set 100 sends category-A communication instruction by its main control chip 101 to Switching Power Supply 200, after decoding chip 201 decoding instructions in Switching Power Supply 200, by 202 pairs of power outputs of power control module, control, thereby provide to the load blocks 102 of this portable equipment the electric energy that possesses adjustability.Yet incompatible due to instruction, the function that this Switching Power Supply 200 cannot provide output to regulate to other portable equipment outside category-A portable set.
As another example, Fig. 2 shows the graphical representation of exemplary on the secondary control switch power supply charging quickly road of only supporting a kind of protocol scheme in prior art.As shown in Figure 2, category-B portable set is only supported a kind of protocol scheme category-B communication instruction of voltage signal (for example such as), receiver by only supporting category-B communication instruction provides instruction to the control circuit of Switching Power Supply, thereby controls power supply circuits to this portable set charging.Equally, the function that this Switching Power Supply cannot provide output to regulate to other portable equipment outside category-B portable set.
And when the portable set to different charges, different due to the communication instruction that portable set is sent out, often need to change different mains chargers and charge to it.Obviously, this has brought great trouble to operator's operation.
Therefore, in the urgent need to a kind of can compatible different communication protocol (instruction) and output voltage adjustable switching power circuit flexibly.
Utility model content
Be at least and solved above technological difficulties, the utility model provides a kind of Design and manufacture cost low, and circuit structure is simple, the compatible good adjustable switching power circuit of output voltage electric current.
According to switching power circuit of the present utility model, comprise AC input rectifying, EMI filter circuit, flyback switching circuit, control circuit, power supply circuits, output rectifier and filter, feedback sample circuit, overshoot absorbing circuit, command protocols received code circuit and command circuit, wherein: the input of AC input rectifying, EMI filter circuit is connected with AC power, output is connected with the input of power supply circuits; The input of flyback switching circuit is connected with the output of overshoot absorbing circuit with the output of control circuit, and output is connected with the input of output rectifier and filter; The input of control circuit is connected with the input of the output of power supply circuits, feedback sample circuit, and output is connected with input, the input of command protocols received code circuit and the input of command circuit of flyback switching circuit; The input of power supply circuits is connected with the output of AC input rectifying, EMI filter circuit, and output is connected with the input of feedback sample circuit and the input of control circuit; The input of output rectifier and filter is connected with the output of flyback switching circuit, and output is connected with the input of load and command protocols received code circuit; The input of feedback sample circuit is connected with the input of the output of power supply circuits, control circuit, and output is connected with the input of overshoot absorbing circuit; The input of overshoot absorbing circuit is connected with the output of feedback sample circuit, and output is connected with the input of flyback switching circuit; The input of command protocols received code circuit is with the output of control circuit, the output of the output of output rectifier and filter and command circuit is connected, and output is connected with load; And the input of command circuit is connected with the output of control circuit, output is connected with the input of output rectifier and filter, the input of command protocols received code circuit.
The utility model Switching Power Supply charging circuit includes the decoding circuit of multiple main flow communication protocol on market, the communication instruction that dissimilar portable set is sent can obtain well being identified, thereby differentiating is category-A type equipment, category-B type equipment, or C kind equipment, adopt the designed Switching Power Supply charger of the utility model switching power circuit only with a charger, to equipment dissimilar on market, to charge, and according to different communication instructions, export the voltage of different grades, in very big raising system charge efficiency, also improved greatly the compatibility to various dissimilar portable sets.
For example, when manufacturer is when producing the charger of portable set, only need manufacture a kind of charging device for this decoding circuit and just can be good at all portable sets on compatible almost market, save greatly system manufacturing cost, Safety Approval cost.And in future, may reduce greatly the quantity of charger on market, thereby reduce greatly in the past due to the discarded environmental pollution causing of a large amount of waste and old chargers.
The Switching Power Supply that the utility model is provided is applied in the application of portable set battery charging field, can be applied in the charging occasion of the portable set of number of different types, can save greatly system cost.
Accompanying drawing explanation
Below in conjunction with accompanying drawing to understanding better the utility model in the description of embodiment of the present utility model, wherein:
Fig. 1 shows the block diagram of only supporting a kind of switch power supply system of protocol scheme in prior art;
Fig. 2 shows the graphical representation of exemplary on the secondary control switch power supply charging quickly road of only supporting another kind of protocol scheme in prior art;
Fig. 3 shows according to the summary block diagram of the compatible scheme of the multi-communication protocol of the utility model embodiment;
Fig. 4 shows a kind of exemplary connection according to the switching power circuit of the utility model embodiment;
Fig. 5 shows according to the exemplary connection of the another kind of the switching power circuit of the utility model embodiment;
Fig. 6 shows according to the detailed icon of a kind of connection of the switching power circuit of the utility model embodiment;
Fig. 7 controls a kind of illustrative methods of fall time while showing non-essential resistance step-down;
Fig. 8 controls the another kind of illustrative methods of fall time while showing non-essential resistance step-down;
Fig. 9 shows a kind of exemplary connection according to the power supply circuits of the switching power circuit of the utility model embodiment;
Figure 10 shows according to the exemplary connection of the another kind of the power supply circuits of the switching power circuit of the utility model embodiment; And
Figure 11 shows according to the various exemplary connection of the overshoot absorbing circuit of the switching power circuit of the utility model embodiment.
Embodiment
Feature and the exemplary embodiment of the utility model various aspects will be described in detail below.Many details have been contained in description below, to provide complete understanding of the present utility model.But, it will be apparent to one skilled in the art that the utility model can be in the situation that do not need some details in these details to implement.Below the description of embodiment is only used to provide the clearer understanding of the utility model by example of the present utility model is shown.The utility model is never limited to any concrete configuration proposing below, but under the prerequisite that does not depart from spirit of the present utility model, has covered any modification, replacement and the improvement of coherent element or parts.
According to switch power supply route two parts of the utility model embodiment, form, a part is that former limit feedback PWM controls main control chip, and a part is communication protocol reception and coding chip in addition.
According to an embodiment, Fig. 3 shows according to the summary block diagram of the compatible scheme of the multi-communication protocol of the utility model embodiment.As shown in Figure 3, Switching Power Supply 300 comprises that being connected to power supply inputs 310 power device 301, command protocols received code circuit (command receiver) 302 and 305, control chip 304 and comprise alternatively the barrier assembly 303 between said modules.Power device 301 is to connected portable set 302 power outputs, and dissimilar portable set sends different output voltage regulating command (for example instruction A, instruction B) to Switching Power Supply.
In Fig. 3, the various supply power modes such as the applicable interchange of power pack or direct current supply.Dissimilar portable set sends different output voltage regulating commands to Switching Power Supply, and its transmission means can have current delivery or voltage transmission, comprises single line or the Multi-encoding mode such as multi-thread.Instruction type comprises the multiple instructions such as current impulse, potential pulse, digital pulse signal, pwm pulse voltage.Switching Power Supply type comprises the various circuit structures such as isolated form and non-isolation type, in isolated form circuit structure, its feedback system is applicable to former limit feedback system, the various circuit topological structures such as Switching Power Supply power transfer topological structure comprises step-down Buck in addition, the Boost that boosts, buck Buck-Boost, flyback Flyback, normal shock Forward.
For ease of setting forth content of the present utility model, according to an embodiment, a kind of inverse-excitation type switch power-supply for mobile telephone external charger of take below describes as example, but, those skilled in the art are to be understood that, the utility model coverage is not limited in following instance application, but has range of application widely.
Fig. 4 shows a kind of exemplary connection according to the Switching Power Supply of the utility model embodiment.In Fig. 4, circuit adopts and exchanges input, and circuit structure is isolated form inverse-excitation type switch power-supply circuit.The category-A instruction of sending of secondary side load equipment, its method is the mode changing by specific rule by output load current, is changed by flyback transformer T1-A and transfers to former limit chip U1, controls the variation of output voltage.For example, and if load equipment has sent category-B instruction (potential pulse or voltage quasi position change by specific rule (pattern)), category-B instruction can enter chip U3 by data receiver D-and/or D+, after the instruction of chip U3 identification category-B, it is encoded, thereby encoded signal is transferred to former limit chip U1 via photoelectrical coupler U2-A, for controlling the variation of output voltage.
Fig. 5 shows according to the exemplary connection of the another kind of the switching power circuit of the utility model embodiment.As shown in Figure 5, according to the difference of line start mode and supply power mode, circuit can also derive the circuit connecting of another form.For example, the control chip U1 of control circuit can be 8 pins.And the resistance R between input rectifying filter circuit and power supply circuits 2 can be connected between the GATE pin of control chip U1 of input rectifying filter circuit and control circuit, so that different controlled supply power modes to be provided.
Fig. 6 shows according to the detailed icon of a kind of connection of the switching power circuit of the utility model embodiment.As shown in Figure 6, according to the adjustable switch flyback switch circuit of the utility model embodiment, mainly comprise following assembly: AC input rectifying, EMI filter circuit (1), flyback switching circuit (2), control circuit (3), power supply circuits (4), output rectifier and filter (5), feedback sample circuit (6), overshoot absorbing circuit (7), command protocols received code circuit (8) and command circuit (9).
AC input rectifying, EMI filter circuit (1) can comprise fuse FUSE, bridge rectifier, X capacitive part.Other common connection that can also comprise this area between 2 of the AB of AC input rectifying, EMI filter circuit (1).
Flyback switching circuit (2) can comprise flyback transformer T1-A, switch MOS FET pipe or BJT triode Q2 and primary current sample resistance part R7.
The main devices of control circuit (3) is a pwm chip and necessary peripheral auxiliary element, is the control chip of one six function pin (pin) or eight function pin in the present embodiment, wherein (not according to pin position order):
VDD: power supply input pin, for chip power supply, start, be connected with power supply circuits (4),
FB: feedback sample pin, for detection of output voltage, be connected with feedback sample circuit (6),
GND: chip lower margin, the reference ground of chip,
GATE:Gate drives pin, for the switch of power ratio control MOSFET or BJT triode, is connected with flyback switching circuit (2),
CS: current sample pin, for detection of transformer primary side electric current, on sampling resistor R7, gather information of voltage, be connected with flyback switching circuit (2),
DATA: communication instruction pin, for receiving the command information of the regulation output voltage and current of load equipment transmission, and instruction protocol transmission circuit (8) is connected,
SOURCE: source class pin, in the circuit that adopts octal chip, with this pin, be connected with MOSFET source class in flyback switching circuit (2) or the emitter of BJT triode, and
CMP: loop compensation pin, with this pin, external loop compensation electric capacity, for improving degeneration factor loop response and stability in the circuit that adopts octal chip.
Command protocols received code circuit (8) is the decoding and coding chip of 6 function pin, can receive but be not limited to following signal: voltage quasi position signal, electric current level signal, pwm pulse modulation signal, digitally encoded signal etc.And the pin of command protocols received code circuit (8) following (not according to pin position order) in the present embodiment:
VDD: power supply pin, for chip power supply, start and be connected with main control circuit output (5),
GND: chip lower margin, the reference ground of chip,
D+: the positive receiving terminal pin of data,
D-: data minus receiving terminal pin,
VD: signal transmission pin, the coded pulse of this pin is transferred to pwm chip (3) by optocoupler transmission circuit (9), and
VP: connect PWM Master control chip (3) output Vbus, the time length while controlling output voltage decline by R8.As an example, Fig. 7 shows outer meeting resistance for controlling output voltage a kind of illustrative methods of fall time.
According to another embodiment, Fig. 8 shows the another kind of illustrative methods that declines and control without outer meeting resistance output voltage.
In addition,, except the connection shown in Fig. 6, between the A of power supply circuits (4), B, also has other connection at 2.For example, according to an embodiment, Fig. 9 shows a kind of exemplary connection according to the power supply circuits of the switching power circuit of the utility model embodiment; Figure 10 shows according to the exemplary connection of the another kind of the power supply circuits of the switching power circuit of the utility model embodiment.As shown in Figure 9, A point can pass through resistance R 3, via switch Q1, is connected to B point; Or as shown in figure 10, A point can be connected directly to B point by resistance R 3.
As shown in Figure 6, output rectifier and filter (5) can comprise output rectifier diode D8, filter capacitor C6 and three major parts of input dummy load, according to the needs of EMI, output rectifier diode can RC absorbing circuit in parallel depending on D8, for different output ripple requirements, output filter circuit can increase π type filter circuit or common mode filtering circuit.Other common connection that can also comprise this area between 2 of output rectifier and filter (5) AB.
Feedback sample circuit (6) can comprise the auxiliary winding T1-B of transformer and the resistor voltage divider network being comprised of one or more resistance R 4, R5, thereby detects output voltage information.
Overshoot absorbing circuit (7) can comprise absorption resistance R6, Absorption Capacitance C5 and unilateral diode D7 tri-parts.According to an embodiment, Figure 11 shows according to the various exemplary connection of the overshoot absorbing circuit of the switching power circuit of the utility model embodiment.In addition, between A in overshoot absorbing circuit (7), B, can also include but not limited to connection as described in Figure 11 at 2.
Command circuit (9) can comprise one or more current-limiting resistance R9, optical coupler U2-BA, U2-B.Command circuit (9) is connected former limit and feeds back between PWM controller (3), output circuit (5) and command protocols received code circuit (8).When command protocols received code circuit (8) boosting of receiving that portable mobile apparatus provides or step-down signal, by internal conversion, provide dissimilar signal and include but not limited to: voltage quasi position signal, pwm pulse modulation signal, digitally encoded signal etc.What signal was transferred to PWM controller (3) by optocoupler once surveys the multistage output realize secondary side output voltage.
The switching power circuit that the utility model provides has the following advantages: low cost of manufacture, and circuit structure is simple, and compatibility is good and output voltage electric current is adjustable.
Below with reference to specific embodiment of the utility model, the utility model has been described, but those skilled in the art all understand, can carry out various modifications, combination and change to these specific embodiments, and can not depart from the spirit and scope of the present utility model that limited by claims or its equivalent.In addition, it is only exemplary that any signal arrows in accompanying drawing should be considered to, rather than restrictive, unless separately there is concrete indication.When term is also contemplated as when the ability of separation or combination is not known, the combination of assembly or step also will be considered to record.
Claims (11)
1. a switching power circuit, comprise AC input rectifying, EMI filter circuit, flyback switching circuit, control circuit, power supply circuits, output rectifier and filter, feedback sample circuit, overshoot absorbing circuit, command protocols received code circuit and command circuit, wherein:
The input of described AC input rectifying, EMI filter circuit is connected with AC power, and output is connected with the input of described power supply circuits;
The input of described flyback switching circuit is connected with the output of described overshoot absorbing circuit with the output of described control circuit, and output is connected with the input of described output rectifier and filter;
The input of described control circuit is connected with the input of the output of described power supply circuits, described feedback sample circuit, and output is connected with input, the input of described command protocols received code circuit and the input of described command circuit of described flyback switching circuit;
The input of described power supply circuits is connected with the output of described AC input rectifying, EMI filter circuit, and output is connected with the input of described feedback sample circuit and the input of described control circuit;
The input of described output rectifier and filter is connected with the output of flyback switching circuit, and output is connected with the input of load and described command protocols received code circuit;
The input of described feedback sample circuit is connected with the input of the output of described power supply circuits, described control circuit, and output is connected with the input of described overshoot absorbing circuit;
The input of described overshoot absorbing circuit is connected with the output of described feedback sample circuit, and output is connected with the input of described flyback switching circuit;
The input of described command protocols received code circuit is with the output of described control circuit, the output of the output of described output rectifier and filter and described command circuit is connected, and output is connected with load; And
The input of described command circuit is connected with the output of described control circuit, and output is connected with the input of described output rectifier and filter, the input of described command protocols received code circuit.
2. switching power circuit according to claim 1, is characterized in that, described control circuit comprises pulse width modulation (PWM) control chip, and this pwm chip comprises:
Power supply input pin, is used to described control chip power supply, is connected with the output of described power supply circuits;
Feedback sample pin, for detection of the output voltage of described switching power circuit, is connected with the input of described feedback sample circuit;
Chip grounding leg, as the reference ground of described control chip;
Drive pin, for driving the switching tube of described flyback switching circuit, be connected with the input of described flyback switching circuit;
Current sample pin, for the primary current of the transformer of described flyback switching circuit is sampled, is connected with the output of described flyback switching circuit; And
Communication instruction pin, for receiving the command information of the regulation output voltage and current of described load transmission, is connected with the input of described command circuit.
3. switching power circuit according to claim 2, is characterized in that, in adopting the circuit of octal chip, this pwm chip also comprises: loop compensation pin, external loop compensation electric capacity, for improving degeneration factor loop response and stability.
4. switching power circuit according to claim 2, is characterized in that, in adopting the circuit of octal chip, this pwm chip also comprises: source class pin, is connected for the emitter of the MOSFET source class with described flyback switching circuit or BJT triode.
5. switching power circuit according to claim 2, is characterized in that, described command protocols received code circuit comprises decoding and coding chip, and this decoding and coding chip comprises:
Power supply pin, the power supply startup for described chip, is connected with the output of described control circuit;
Chip grounding leg, as the reference ground of described control chip;
C:D+ pin, as the positive receiving terminal of data;
D:D-pin, as data minus receiving terminal; And
E:VD pin, for the pin of signal transmission, the coded pulse of this E:VD pin is transferred to described pwm chip.
6. switching power circuit according to claim 5, it is characterized in that, this decoding and coding chip also comprises: F:VP pin, by resistance, be connected to described pwm chip or be directly connected to described pwm chip, time length while declining to control output voltage for output voltage signal.
7. switching power circuit according to claim 1, is characterized in that, this switching power circuit also comprises optocoupler transmission circuit, is connected between described control circuit and described command protocols received code circuit use transfer encoding pulse.
8. switching power circuit according to claim 1, is characterized in that, output rectifier and filter comprises output rectifier diode and filter capacitor.
9. switching power circuit according to claim 8, is characterized in that, output rectifier and filter also comprises π type filter circuit and/or common mode filtering circuit.
10. switching power circuit according to claim 1, is characterized in that, feedback circuit is comprised of sample resistance.
11. switching power circuits according to claim 1, is characterized in that, by the regular variation of output load current and by transformer coupled, control the method for output voltage.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420231400.9U CN203827185U (en) | 2014-05-07 | 2014-05-07 | Switching power supply circuit being compatible with various communication command and supporting multistage buck-boost |
| TW103211836U TWM499008U (en) | 2014-05-07 | 2014-07-03 | Switch power supply circuit with adjustable output voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420231400.9U CN203827185U (en) | 2014-05-07 | 2014-05-07 | Switching power supply circuit being compatible with various communication command and supporting multistage buck-boost |
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| Publication Number | Publication Date |
|---|---|
| CN203827185U true CN203827185U (en) | 2014-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420231400.9U Expired - Lifetime CN203827185U (en) | 2014-05-07 | 2014-05-07 | Switching power supply circuit being compatible with various communication command and supporting multistage buck-boost |
Country Status (2)
| Country | Link |
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| CN (1) | CN203827185U (en) |
| TW (1) | TWM499008U (en) |
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- 2014-05-07 CN CN201420231400.9U patent/CN203827185U/en not_active Expired - Lifetime
- 2014-07-03 TW TW103211836U patent/TWM499008U/en not_active IP Right Cessation
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