CN213305255U - Power supply circuit with multiple output voltages and power supply device - Google Patents
Power supply circuit with multiple output voltages and power supply device Download PDFInfo
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- CN213305255U CN213305255U CN202021322590.7U CN202021322590U CN213305255U CN 213305255 U CN213305255 U CN 213305255U CN 202021322590 U CN202021322590 U CN 202021322590U CN 213305255 U CN213305255 U CN 213305255U
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Abstract
The utility model relates to a supply circuit and power supply unit with a plurality of output voltage, include: the device comprises a voltage stabilizing circuit, a DC-DC circuit, an output interface and a control circuit; the input end of the voltage stabilizing circuit and the input end of the DC-DC circuit are connected with an input voltage, the output end of the voltage stabilizing circuit is connected with the power supply end of the control circuit, the output end of the DC-DC circuit is connected with the input end of the output circuit, the output end of the output circuit is connected with the input end of the output interface, the control end of the control circuit is connected with the feedback end of the DC-DC circuit, and the detection end of the control circuit is connected with the output interface; when the output interface is connected to a load, the control circuit detects the voltage of the load and outputs a control signal to the DC-DC circuit according to the voltage of the load so as to control the DC-DC circuit to adjust the output voltage of the output circuit according to the control signal. The power supply circuit can realize the output of a plurality of voltages only by one output interface, and has the advantages of simple circuit structure, low cost, small power supply volume and convenient maintenance.
Description
Technical Field
The utility model relates to a power technical field, more specifically say, relate to a supply circuit and power supply unit with a plurality of output voltage.
Background
The power supply products are often load products of which the power supply needs to be matched with different voltages, while the existing power supply products often meet the requirements of loads with different voltages by designing a plurality of output interfaces, and simultaneously need to design a plurality of different output circuits so as to meet the loads with different voltages. The circuit structure is complex, the cost is low, the more load voltage types that need to be met, the more complex the circuit is, the higher the cost is, the larger the power supply volume is, and the maintenance difficulty is high.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the present invention is to provide a power supply circuit and a power supply apparatus having a plurality of output voltages, in view of the above-mentioned drawbacks of the prior art.
The utility model provides a technical scheme that its technical problem adopted is: constructing a power supply circuit having a plurality of output voltages, comprising: the device comprises a voltage stabilizing circuit, a DC-DC circuit, an output interface and a control circuit;
the input end of the voltage stabilizing circuit and the input end of the DC-DC circuit are connected with an input voltage, the output end of the voltage stabilizing circuit is connected with the power supply end of the control circuit, the output end of the DC-DC circuit is connected with the input end of the output circuit, the output end of the output circuit is connected with the input end of the output interface, the control end of the control circuit is connected with the feedback end of the DC-DC circuit, and the detection end of the control circuit is connected with the output interface;
when the output interface is connected to a load, the control circuit detects the voltage of the load and outputs a control signal to the DC-DC circuit according to the voltage of the load so as to control the DC-DC circuit to adjust the output voltage of the output circuit according to the control signal.
Preferably, the method further comprises the following steps: a feedback circuit disposed between the control circuit and the DC-DC circuit;
the feedback circuit receives the control signal output by the control circuit, processes the control signal and then sends the processed control signal to the feedback end of the DC-DC circuit.
Preferably, the feedback circuit includes: a switching circuit and a filter circuit;
the input end of the switch circuit is connected with the control end of the control circuit, the output end of the switch circuit is connected with the input end of the filter circuit, and the output end of the filter circuit is connected with the feedback end of the DC-DC circuit.
Preferably, the method further comprises the following steps: the first regulating circuit is connected with the output interface;
the first adjusting circuit adjusts the output voltage of the output circuit according to the adjusting operation input by the user.
Preferably, the method further comprises the following steps: the second regulating circuit is connected with the control circuit;
the second adjusting circuit outputs an adjusting signal to the control circuit according to the key operation input by the user, and the control circuit outputs a control signal to the DC-DC circuit according to the adjusting signal.
Preferably, the voltage stabilizing circuit comprises: the third diode, the eleventh resistor, the tenth capacitor, the voltage stabilizing chip, the ninth capacitor and the eleventh capacitor;
the anode of the third diode is connected with an input voltage, the cathode of the third diode is connected with the second pin of the voltage stabilizing chip through the eleventh resistor, one end of the tenth capacitor is connected with the second pin of the voltage stabilizing chip, and the other end of the tenth capacitor is grounded; a first end of the ninth capacitor is connected with the second pin of the voltage stabilizing chip, a second end of the ninth capacitor is grounded, the eleventh capacitor is connected with the ninth capacitor in parallel, the first pin of the voltage stabilizing chip is grounded, and the second pin of the voltage stabilizing chip outputs a power supply voltage;
the anode of the third diode is the input end of the voltage stabilizing circuit, and the second pin of the voltage stabilizing chip is the output end of the voltage stabilizing circuit.
Preferably, the control circuit includes: a control chip;
a first pin of the control chip is connected with a second pin of the voltage stabilizing chip, and a seventh pin of the control chip outputs the control signal; a sixth pin of the control chip is connected to the output interface through a sixteenth resistor;
and a seventh pin of the control chip is a control end of the control circuit.
Preferably, the DC-DC circuit includes: the circuit comprises a third capacitor, a fourth capacitor, a second resistor, a conversion chip, a first inductor and a first diode;
the first end of the third capacitor and the first end of the fourth capacitor are connected with the input voltage, the second end of the third capacitor and the second end of the fourth capacitor are grounded, the first pin of the conversion chip is connected with the input voltage, the second pin of the conversion chip is grounded through the second resistor, the fourth pin of the conversion chip is connected with the first end of the first inductor, the second end of the first inductor is connected with the input end of the output circuit, the cathode of the first diode is connected with the fourth pin of the conversion chip, the anode of the first diode is grounded, and the fifth pin of the conversion chip is connected with the output circuit and the filter circuit;
the first pin of the conversion chip is an input end of the DC-DC circuit, the second end of the first inductor is an output end of the DC-DC circuit, and the fifth pin of the conversion chip is a feedback end of the DC-DC circuit.
Preferably, the output circuit includes: a fourteenth resistor, a fourth resistor, a first capacitor, a first resistor, a fifteenth resistor, a thirteenth resistor and a second capacitor;
a first end of the fourteenth resistor is connected to the second end of the first inductor, a second end of the fourteenth resistor is connected to the first end of the fourth resistor and the fifth pin of the conversion chip, and a second end of the fourth resistor is grounded; the first capacitor is connected in parallel with the fourth resistor and the fifteenth resistor, the first resistor and the fifteenth resistor are connected in series and then connected in parallel with the first capacitor, the connecting end of the first resistor and the fifteenth resistor is also connected with the first end of the thirteenth resistor, the second end of the thirteenth resistor is grounded through the second capacitor, and the second end of the thirteenth resistor is also connected with the second pin of the control chip;
a first end of the fourteenth resistor is an input end of the output circuit, and a first end of the first resistor and a second end of the fifteenth resistor are output ends of the output circuit.
Preferably, the switching circuit includes: the circuit comprises an eighth resistor, a ninth resistor, a tenth resistor and a first triode;
a first end of the eighth resistor is connected with a seventh pin of the control chip, and a second end of the eighth resistor is connected with a base electrode of the first triode; the base electrode of the first triode is connected with the first end of the ninth resistor, the second end of the ninth resistor and the first end of the tenth resistor are connected with the power supply voltage, the second end of the tenth resistor is connected with the emitting electrode of the first triode, and the collecting electrode of the first triode is connected with the filter circuit.
Preferably, the filter circuit includes: the fourth resistor, the fifth resistor, the sixth resistor, the fifth capacitor, the sixth capacitor, the seventh capacitor, the eighth capacitor and the second diode;
a first end of the seventh resistor is connected with a collector of the first triode, and a second end of the seventh resistor is connected with an anode of the second diode sequentially through the fifth resistor and the sixth resistor; the first end of the fifth capacitor is connected with the first end of the seventh resistor, and the second end of the fifth capacitor is grounded; a first end of the sixth capacitor is connected between the seventh resistor and the fifth resistor, and a second end of the sixth capacitor, a second end of the seventh capacitor and a second end of the eighth capacitor are grounded; the first end of the seventh capacitor is connected between the fifth resistor and the sixth resistor, the first end of the eighth capacitor is connected between the sixth resistor and the second diode, and the cathode of the second diode is connected with the fifth pin of the conversion chip.
Preferably, the output interface includes: a first end, a second end and a third end;
a first end of the output interface is connected with a first end of the first resistor, and a third end of the output interface is connected with a second end of the fifteenth resistor;
the second end of the output interface is connected with the sixth pin of the control chip through the sixteenth resistor, and the third end of the output interface is grounded.
Preferably, the first adjusting circuit includes: setting a key, a twelfth resistor and a twelfth capacitor;
the first end of the setting key is connected with the power supply voltage through the twelfth resistor, and the second end of the setting key is grounded;
the first end of the twelfth capacitor is connected with the first end of the sixteenth resistor, the second end of the twelfth capacitor is grounded, and the first end of the setting key is also connected with the second end of the sixteenth resistor.
Preferably, the second regulating circuit includes: the first key, the eighteenth resistor, the twentieth resistor, the fourteenth capacitor, the second key, the thirteenth capacitor, the seventeenth resistor and the nineteenth resistor;
the first end of the first key is connected with the power supply voltage through the eighteenth resistor, and the second end of the first key and the second end of the fourteenth capacitor are grounded; a first end of the twentieth resistor and a first end of the fourteenth capacitor are connected with a fourth pin of the control chip, and a second end of the twentieth resistor is connected with a first end of the first key;
the first end of the second key is connected with the power supply voltage through the seventeenth resistor, and the second end of the second key and the second end of the thirteenth capacitor are grounded; and the first end of the nineteenth resistor and the first end of the thirteenth capacitor are connected with the fifth pin of the control chip, and the second end of the nineteenth resistor is connected with the first end of the first key.
The utility model also provides a power supply unit, including above power supply circuit who has a plurality of output voltage.
Implement the utility model discloses a supply circuit with a plurality of output voltage has following beneficial effect: the method comprises the following steps: the device comprises a voltage stabilizing circuit, a DC-DC circuit, an output interface and a control circuit; the input end of the voltage stabilizing circuit and the input end of the DC-DC circuit are connected with an input voltage, the output end of the voltage stabilizing circuit is connected with the power supply end of the control circuit, the output end of the DC-DC circuit is connected with the input end of the output circuit, the output end of the output circuit is connected with the input end of the output interface, the control end of the control circuit is connected with the feedback end of the DC-DC circuit, and the detection end of the control circuit is connected with the output interface; when the output interface is connected to a load, the control circuit detects the voltage of the load and outputs a control signal to the DC-DC circuit according to the voltage of the load so as to control the DC-DC circuit to adjust the output voltage of the output circuit according to the control signal. The power supply circuit can realize the output of a plurality of voltages only by one output interface, and has the advantages of simple circuit structure, low cost, small power supply volume and convenient maintenance.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic block diagram of a power supply circuit having multiple output voltages according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of another embodiment of a power supply circuit with multiple output voltages according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a power supply circuit with multiple output voltages according to an embodiment of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, the detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings.
It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. Furthermore, the description of the upper, lower, left, right, front, rear, etc. used in the present invention is only relative to the mutual position relationship of the components of the present invention in the drawings. Furthermore, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any combination of one or more of the associated listed items.
Referring to fig. 1, fig. 1 is a schematic block diagram of an alternative embodiment of the present invention. The power supply circuit with the plurality of output voltages can be suitable for power supply products such as batteries and the like.
Specifically, as shown in fig. 1, the power supply circuit with multiple output voltages may include: a voltage stabilizing circuit 11, a DC-DC circuit 12, an output circuit 13, an output interface 14 and a control circuit 15.
The input end of the voltage stabilizing circuit 11 and the input end of the DC-DC circuit 12 are connected with an input voltage, the output end of the voltage stabilizing circuit 11 is connected with the power supply end of the control circuit 15, the output end of the DC-DC circuit 12 is connected with the input end of the output circuit 13, the output end of the output circuit 13 is connected with the input end of the output interface 14, the control end of the control circuit 15 is connected with the feedback end of the DC-DC circuit 12, and the detection end of the control circuit 15 is connected with the output interface 14.
When the output interface 14 is connected to a load, the control circuit 15 detects the voltage of the load and outputs a control signal to the DC-DC circuit 12 according to the voltage of the load, so as to control the DC-DC circuit 12 to adjust the output voltage of the output circuit 13 according to the control signal. In some embodiments, when a load is connected to the output interface 14, the control circuit 15 detects the load connected to the output interface 14 to identify the voltage of the load, and outputs a control signal to the DC-DC circuit 12 according to the voltage of the load, and the DC-DC circuit 12 adjusts the output voltage of the output circuit 13 according to the control signal, so that the output voltage output by the output circuit 13 can meet the voltage requirement of the load, and thus one output interface 14 can meet the requirement of loads with different voltages, that is, one output interface 14 can output different output voltages. For example, if the voltage requirement of the load a is 5V, when the load a is connected to the output interface 14, the control circuit 15 may identify the voltage of the load a by detecting the voltage at the output interface 14, and then output a corresponding control signal to the DC-DC circuit 12, and the DC-DC circuit 12 adjusts the output circuit 13 according to the received control signal, so that the output voltage output by the output circuit 13 is 5V to meet the voltage requirement of the load a; or if the voltage requirement of the load B is 10V, when the load B is connected to the output interface 14, the control circuit 15 may identify the voltage of the load B by detecting the voltage at the output interface 14, and then output a corresponding control signal to the DC-DC circuit 12, and the DC-DC circuit 12 adjusts the output circuit 13 according to the received control signal, so that the output voltage output by the output circuit 13 is 10V to meet the voltage requirement of the load B.
Further, in some embodiments, the method further comprises: a feedback circuit 16 provided between the control circuit 15 and the DC-DC circuit 12. The feedback circuit 16 receives the control signal output by the control circuit 15, processes the control signal, and sends the processed control signal to the feedback end of the DC-DC circuit 12.
In some embodiments, the feedback circuit 16 includes: a switching circuit and a filter circuit.
The input end of the switching circuit is connected with the control end of the control circuit 15, the output end of the switching circuit is connected with the input end of the filter circuit, and the output end of the filter circuit is connected with the feedback end of the DC-DC circuit 12. The switching circuit can be realized by a triode or an MOS (metal oxide semiconductor) transistor. The filter circuit can be realized by freely combining resistors and capacitors in series, parallel or series-parallel connection.
By detecting the voltage of the output interface 14 through the control circuit 15, when the output interface 14 is connected to a load, the control circuit 15 can automatically identify the required voltage of the load, and output a control signal to the feedback circuit 16 according to the required voltage of the load, the feedback circuit 16 processes the control signal and feeds the control signal back to the feedback end of the DC-DC circuit 12, and the DC-DC circuit 12 adjusts the output voltage of the output circuit 13 according to the signal received by the feedback end, so as to meet the voltage requirement of the load.
Referring to fig. 2, fig. 2 is a schematic block diagram of another alternative embodiment provided by the present invention.
The implementation is based on the embodiment of fig. 1, and further includes: a first regulating circuit 17 connected to the output interface 14. The first adjusting circuit 17 adjusts the output voltage of the output circuit 13 according to an adjusting operation input by a user.
Specifically, the purpose of setting the output voltage can be achieved by adjusting the first adjusting circuit 17 by a user, so as to meet the voltage requirement of the load. In some embodiments, the first adjusting circuit 17 may be implemented by a key, wherein the key may be operated by a plurality of key operation modes such as long pressing, short pressing, multiple quick pressing, and the like, so as to set the output voltage by the key.
Further, as shown in fig. 2, the method may further include: a second regulating circuit 18 connected to the control circuit 15. The second adjusting circuit 18 outputs an adjusting signal to the control circuit 15 according to a key operation input by a user, and the control circuit 15 outputs a control signal to the DC-DC circuit 12 according to the adjusting signal. In some embodiments, the second adjusting circuit 18 may be implemented by one or more buttons, wherein the one or more buttons may achieve the purpose of increasing or decreasing the output voltage according to different operations of the user, such as long pressing, short pressing, multiple quick pressing, and the like, so as to control the output voltage, so that the output voltage can meet the load requirement.
By providing the first regulating circuit 17 and/or the second regulating circuit 18, when the control circuit 15 cannot recognize the voltage of the load connected to the output interface 14, the first regulating circuit 17 and/or the second regulating circuit 18 can be used to regulate and control the output voltage, so that the output voltage can meet the load requirement.
Referring to fig. 3, fig. 3 is a circuit diagram of an alternative embodiment of the various embodiments provided by the present invention.
As shown in fig. 3, the regulator circuit 11 includes: the circuit comprises a third diode D3, an eleventh resistor R11, a tenth capacitor C10, a voltage stabilizing chip U3, a ninth capacitor C9 and an eleventh capacitor C11.
The anode of the third diode D3 is connected to the input voltage VIN, the cathode of the third diode D3 is connected to the second pin of the voltage regulation chip U3 through the eleventh resistor R11, one end of the tenth capacitor C10 is connected to the second pin of the voltage regulation chip U3, and the other end of the tenth capacitor C10 is grounded; the first end of the ninth capacitor C9 is connected with the second pin of the voltage stabilization chip U3, the second end of the ninth capacitor C9 is grounded, the eleventh capacitor C11 is connected with the ninth capacitor C9 in parallel, the first pin of the voltage stabilization chip U3 is grounded, and the second pin of the voltage stabilization chip U3 outputs the supply voltage VCC.
The anode of the third diode D3 is the input terminal of the voltage regulator circuit 11, and the second pin of the voltage regulator chip U3 is the output terminal of the voltage regulator circuit 11.
In some embodiments, the control circuit 15 includes: and a control chip U2.
The first pin of the control chip U2 is connected with the second pin of the voltage stabilizing chip U3, and the seventh pin of the control chip U2 outputs a control signal; the sixth pin of the control chip U2 is connected to the output interface 14 through a sixteenth resistor R16. The seventh pin of the control chip U2 is a control terminal of the control circuit 15.
In some embodiments, the DC-DC circuit 12 includes: the circuit comprises a third capacitor C3, a fourth capacitor C4, a second resistor R2, a conversion chip U1, a first inductor L1 and a first diode D1.
The first end of the third capacitor C3 and the first end of the fourth capacitor C4 are connected with an input voltage VIN, the second end of the third capacitor C3 and the second end of the fourth capacitor C4 are grounded, the first pin of the conversion chip U1 is connected with the input voltage VIN, the second pin of the conversion chip U1 is grounded through a second resistor R2, the fourth pin of the conversion chip U1 is connected with the first end of the first inductor L1, the second end of the first inductor L1 is connected with the input end of the output circuit 13, the cathode of the first diode D1 is connected with the fourth pin of the conversion chip U1, the anode of the first diode D1 is grounded, and the fifth pin of the conversion chip U1 is connected with the output circuit 13 and the filter circuit.
The first pin of the conversion chip U1 is an input terminal of the DC-DC circuit 12, the second terminal of the first inductor L1 is an output terminal of the DC-DC circuit 12, and the fifth pin of the conversion chip U1 is a feedback terminal of the DC-DC circuit 12.
In some embodiments, the output circuit 13 includes: a fourteenth resistor R14, a fourth resistor R4, a first capacitor C1, a first resistor R1, a fifteenth resistor R15, a thirteenth resistor R13, and a second capacitor.
A first end of the fourteenth resistor R14 is connected to the second end of the first inductor L1, a second end of the fourteenth resistor R14 is connected to the first end of the fourth resistor R4 and the fifth pin of the conversion chip U1, and a second end of the fourth resistor R4 is grounded; the first capacitor C1 is connected in parallel with the fourth resistor R4 and the fifteenth resistor R15, the first resistor R1 and the fifteenth resistor R15 are connected in series and then connected in parallel with the first capacitor C1, the connection end of the first resistor R1 and the fifteenth resistor R15 is further connected with the first end of the thirteenth resistor R13, the second end of the thirteenth resistor R13 is grounded through the second capacitor, and the second end of the thirteenth resistor R13 is further connected with the second pin of the control chip U2.
A first end of the fourteenth resistor R14 is an input end of the output circuit 13, and a first end of the first resistor R1 and a second end of the fifteenth resistor R15 are output ends of the output circuit 13.
In some embodiments, the switching circuit comprises: an eighth resistor R8, a ninth resistor R9, a tenth resistor R10 and a first triode Q1.
A first end of the eighth resistor R8 is connected with a seventh pin of the control chip U2, and a second end of the eighth resistor R8 is connected with a base electrode of the first triode Q1; the base of the first triode Q1 is connected with the first end of the ninth resistor R9, the second end of the ninth resistor R9 and the first end of the tenth resistor R10 are connected with the power supply voltage VCC, the second end of the tenth resistor R10 is connected with the emitter of the first triode Q1, and the collector of the first triode Q1 is connected with the filter circuit.
In some embodiments, the filter circuit comprises: the circuit comprises a seventh resistor R7, a fifth resistor R5, a sixth resistor R6, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8 and a second diode D2.
A first end of the seventh resistor R7 is connected to a collector of the first triode Q1, and a second end of the seventh resistor R7 is connected to an anode of the second diode D2 through the fifth resistor R5 and the sixth resistor R6 in sequence; a first end of the fifth capacitor C5 is connected to a first end of the seventh resistor R7, and a second end of the fifth capacitor C5 is grounded; a first end of a sixth capacitor C6 is connected between the seventh resistor R7 and the fifth resistor R5, and a second end of the sixth capacitor C6, a second end of the seventh capacitor C7 and a second end of the eighth capacitor C8 are grounded; the first end of the seventh capacitor C7 is connected between the fifth resistor R5 and the sixth resistor R6, the first end of the eighth capacitor C8 is connected between the sixth resistor R6 and the second diode D2, and the cathode of the second diode D2 is connected to the fifth pin of the switch chip U1.
In some embodiments, the output interface 14 includes: a first end, a second end, and a third end.
The first end of the output interface 14 is connected with the first end of the first resistor R1, and the third end of the output interface 14 is connected with the second end of the fifteenth resistor R15; the second terminal of the output interface 14 is connected to the sixth pin of the control chip U2 through a sixteenth resistor R16, and the third terminal of the output interface 14 is further grounded.
In some embodiments, the first regulating circuit 17 comprises: the key SW, the twelfth resistor R12 and the twelfth capacitor are set. The first end of the setting button SW is connected with the power supply voltage VCC through a twelfth resistor R12, and the second end of the setting button SW is grounded; the first end of the twelfth capacitor is connected to the first end of the sixteenth resistor R16, the second end of the twelfth capacitor is grounded, and the first end of the setting button SW is further connected to the second end of the sixteenth resistor R16.
In some embodiments, the second regulating circuit 18 includes: a first key SW1, an eighteenth resistor R18, a twentieth resistor R20, a fourteenth capacitor C14, a second key SW2, a thirteenth capacitor C13, a seventeenth resistor R17 and a nineteenth resistor R19.
The first end of the first key SW1 is connected to the supply voltage VCC through an eighteenth resistor R18, and the second end of the first key SW1 and the second end of the fourteenth capacitor C14 are grounded; the first end of the twentieth resistor R20 and the first end of the fourteenth capacitor C14 are connected to the fourth pin of the control chip U2, and the second end of the twentieth resistor R20 is connected to the first end of the first key SW 1. A first end of the second key SW2 is connected to the supply voltage VCC through a seventeenth resistor R17, and a second end of the second key SW2 and a second end of the thirteenth capacitor C13 are grounded; the first end of the nineteenth resistor R19 and the first end of the thirteenth capacitor C13 are connected to the fifth pin of the control chip U2, and the second end of the nineteenth resistor R19 is connected to the first end of the first key SW 1.
The utility model also provides a power supply unit, include the embodiment of the utility model discloses a supply circuit with a plurality of output voltage. Optionally, the power supply device includes, but is not limited to, a power supply, a battery, and other power supply products.
Through setting up this power supply circuit who has a plurality of output voltage, only need an output interface can realize the output of a plurality of voltages, circuit structure is simple, and is with low costs, and the power is small, and it is convenient to maintain.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and implement the present invention accordingly, which can not limit the protection scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention shall fall within the scope of the claims of the present invention. It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (15)
1. A power supply circuit having a plurality of output voltages, comprising: the device comprises a voltage stabilizing circuit, a DC-DC circuit, an output interface and a control circuit;
the input end of the voltage stabilizing circuit and the input end of the DC-DC circuit are connected with an input voltage, the output end of the voltage stabilizing circuit is connected with the power supply end of the control circuit, the output end of the DC-DC circuit is connected with the input end of the output circuit, the output end of the output circuit is connected with the input end of the output interface, the control end of the control circuit is connected with the feedback end of the DC-DC circuit, and the detection end of the control circuit is connected with the output interface;
when the output interface is connected to a load, the control circuit detects the voltage of the load and outputs a control signal to the DC-DC circuit according to the voltage of the load so as to control the DC-DC circuit to adjust the output voltage of the output circuit according to the control signal.
2. The power supply circuit with multiple output voltages of claim 1, further comprising: a feedback circuit disposed between the control circuit and the DC-DC circuit;
the feedback circuit receives the control signal output by the control circuit, processes the control signal and then sends the processed control signal to the feedback end of the DC-DC circuit.
3. The power supply circuit of claim 2, wherein the feedback circuit comprises: a switching circuit and a filter circuit;
the input end of the switch circuit is connected with the control end of the control circuit, the output end of the switch circuit is connected with the input end of the filter circuit, and the output end of the filter circuit is connected with the feedback end of the DC-DC circuit.
4. The power supply circuit with multiple output voltages of claim 3, further comprising: the first regulating circuit is connected with the output interface;
the first adjusting circuit adjusts the output voltage of the output circuit according to the adjusting operation input by the user.
5. The power supply circuit with multiple output voltages of claim 4, further comprising: the second regulating circuit is connected with the control circuit;
the second adjusting circuit outputs an adjusting signal to the control circuit according to the key operation input by the user, and the control circuit outputs a control signal to the DC-DC circuit according to the adjusting signal.
6. The power supply circuit of claim 5, wherein the voltage regulator circuit comprises: the third diode, the eleventh resistor, the tenth capacitor, the voltage stabilizing chip, the ninth capacitor and the eleventh capacitor;
the anode of the third diode is connected with an input voltage, the cathode of the third diode is connected with the second pin of the voltage stabilizing chip through the eleventh resistor, one end of the tenth capacitor is connected with the second pin of the voltage stabilizing chip, and the other end of the tenth capacitor is grounded; a first end of the ninth capacitor is connected with the second pin of the voltage stabilizing chip, a second end of the ninth capacitor is grounded, the eleventh capacitor is connected with the ninth capacitor in parallel, the first pin of the voltage stabilizing chip is grounded, and the second pin of the voltage stabilizing chip outputs a power supply voltage;
the anode of the third diode is the input end of the voltage stabilizing circuit, and the second pin of the voltage stabilizing chip is the output end of the voltage stabilizing circuit.
7. The power supply circuit of claim 6 having a plurality of output voltages, wherein the control circuit comprises: a control chip;
a first pin of the control chip is connected with a second pin of the voltage stabilizing chip, and a seventh pin of the control chip outputs the control signal; a sixth pin of the control chip is connected to the output interface through a sixteenth resistor;
and a seventh pin of the control chip is a control end of the control circuit.
8. The power supply circuit of claim 7 having multiple output voltages, wherein the DC-DC circuit comprises: the circuit comprises a third capacitor, a fourth capacitor, a second resistor, a conversion chip, a first inductor and a first diode;
the first end of the third capacitor and the first end of the fourth capacitor are connected with the input voltage, the second end of the third capacitor and the second end of the fourth capacitor are grounded, the first pin of the conversion chip is connected with the input voltage, the second pin of the conversion chip is grounded through the second resistor, the fourth pin of the conversion chip is connected with the first end of the first inductor, the second end of the first inductor is connected with the input end of the output circuit, the cathode of the first diode is connected with the fourth pin of the conversion chip, the anode of the first diode is grounded, and the fifth pin of the conversion chip is connected with the output circuit and the filter circuit;
the first pin of the conversion chip is an input end of the DC-DC circuit, the second end of the first inductor is an output end of the DC-DC circuit, and the fifth pin of the conversion chip is a feedback end of the DC-DC circuit.
9. The power supply circuit of claim 8 having a plurality of output voltages, wherein the output circuit comprises: a fourteenth resistor, a fourth resistor, a first capacitor, a first resistor, a fifteenth resistor, a thirteenth resistor and a second capacitor;
a first end of the fourteenth resistor is connected to the second end of the first inductor, a second end of the fourteenth resistor is connected to the first end of the fourth resistor and the fifth pin of the conversion chip, and a second end of the fourth resistor is grounded; the first capacitor is connected in parallel with the fourth resistor and the fifteenth resistor, the first resistor and the fifteenth resistor are connected in series and then connected in parallel with the first capacitor, the connecting end of the first resistor and the fifteenth resistor is also connected with the first end of the thirteenth resistor, the second end of the thirteenth resistor is grounded through the second capacitor, and the second end of the thirteenth resistor is also connected with the second pin of the control chip;
a first end of the fourteenth resistor is an input end of the output circuit, and a first end of the first resistor and a second end of the fifteenth resistor are output ends of the output circuit.
10. The power supply circuit with multiple output voltages of claim 8, wherein the switching circuit comprises: the circuit comprises an eighth resistor, a ninth resistor, a tenth resistor and a first triode;
a first end of the eighth resistor is connected with a seventh pin of the control chip, and a second end of the eighth resistor is connected with a base electrode of the first triode; the base electrode of the first triode is connected with the first end of the ninth resistor, the second end of the ninth resistor and the first end of the tenth resistor are connected with the power supply voltage, the second end of the tenth resistor is connected with the emitting electrode of the first triode, and the collecting electrode of the first triode is connected with the filter circuit.
11. The power supply circuit with multiple output voltages of claim 10, wherein the filtering circuit comprises: the fourth resistor, the fifth resistor, the sixth resistor, the fifth capacitor, the sixth capacitor, the seventh capacitor, the eighth capacitor and the second diode;
a first end of the seventh resistor is connected with a collector of the first triode, and a second end of the seventh resistor is connected with an anode of the second diode sequentially through the fifth resistor and the sixth resistor; the first end of the fifth capacitor is connected with the first end of the seventh resistor, and the second end of the fifth capacitor is grounded; a first end of the sixth capacitor is connected between the seventh resistor and the fifth resistor, and a second end of the sixth capacitor, a second end of the seventh capacitor and a second end of the eighth capacitor are grounded; the first end of the seventh capacitor is connected between the fifth resistor and the sixth resistor, the first end of the eighth capacitor is connected between the sixth resistor and the second diode, and the cathode of the second diode is connected with the fifth pin of the conversion chip.
12. The power supply circuit of claim 9, wherein the output interface comprises: a first end, a second end and a third end;
a first end of the output interface is connected with a first end of the first resistor, and a third end of the output interface is connected with a second end of the fifteenth resistor;
the second end of the output interface is connected with the sixth pin of the control chip through the sixteenth resistor, and the third end of the output interface is grounded.
13. The power supply circuit with multiple output voltages of claim 12, wherein the first regulation circuit comprises: setting a key, a twelfth resistor and a twelfth capacitor;
the first end of the setting key is connected with the power supply voltage through the twelfth resistor, and the second end of the setting key is grounded;
the first end of the twelfth capacitor is connected with the first end of the sixteenth resistor, the second end of the twelfth capacitor is grounded, and the first end of the setting key is also connected with the second end of the sixteenth resistor.
14. The power supply circuit with multiple output voltages of claim 12, wherein the second regulation circuit comprises: the first key, the eighteenth resistor, the twentieth resistor, the fourteenth capacitor, the second key, the thirteenth capacitor, the seventeenth resistor and the nineteenth resistor;
the first end of the first key is connected with the power supply voltage through the eighteenth resistor, and the second end of the first key and the second end of the fourteenth capacitor are grounded; a first end of the twentieth resistor and a first end of the fourteenth capacitor are connected with a fourth pin of the control chip, and a second end of the twentieth resistor is connected with a first end of the first key;
the first end of the second key is connected with the power supply voltage through the seventeenth resistor, and the second end of the second key and the second end of the thirteenth capacitor are grounded; and the first end of the nineteenth resistor and the first end of the thirteenth capacitor are connected with the fifth pin of the control chip, and the second end of the nineteenth resistor is connected with the first end of the first key.
15. A power supply arrangement comprising a power supply circuit with multiple output voltages as claimed in any one of claims 1 to 14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021322590.7U CN213305255U (en) | 2020-07-06 | 2020-07-06 | Power supply circuit with multiple output voltages and power supply device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021322590.7U CN213305255U (en) | 2020-07-06 | 2020-07-06 | Power supply circuit with multiple output voltages and power supply device |
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| CN213305255U true CN213305255U (en) | 2021-05-28 |
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| CN202021322590.7U Active CN213305255U (en) | 2020-07-06 | 2020-07-06 | Power supply circuit with multiple output voltages and power supply device |
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| CN (1) | CN213305255U (en) |
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2020
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