CN110581647A - Signal source circuit based on charger and battery power supply and power supply method - Google Patents
Signal source circuit based on charger and battery power supply and power supply method Download PDFInfo
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- CN110581647A CN110581647A CN201910932996.2A CN201910932996A CN110581647A CN 110581647 A CN110581647 A CN 110581647A CN 201910932996 A CN201910932996 A CN 201910932996A CN 110581647 A CN110581647 A CN 110581647A
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- power supply
- charger
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- battery
- signal source
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/36—Arrangements using end-cell switching
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
Abstract
the invention relates to a signal source circuit based on power supply of a charger and a battery and a power supply method, belongs to the technical field of direct current power supply, and solves the problems of large power loss and low working efficiency of the existing power source resource. The charger comprises a charger interface, a battery box interface, a single-pole double-throw switch and a buck-boost module; the boost-buck module comprises a boost chip, an inductor L1, a capacitor C3 and a freewheeling diode D2; one end of the inductor L1 is connected with a positive power supply input end, the other end of the inductor L1 is connected with one end of a capacitor C3, and the other end of the capacitor C3 is connected with the anode of a freewheeling diode D2; the VIN end of the boost chip is connected with the positive input end of the power supply, the SWITCH end is connected with one end of the capacitor C3, and the GND end is connected with the negative input end of the power supply. The effect of replacing a low-power direct-current source with the output wide-range voltage is achieved, the working efficiency of the circuit is improved, and meanwhile, the power loss is reduced.
Description
Technical Field
the invention relates to the technical field of direct current power supply, in particular to a signal source circuit based on power supply of a charger and a battery and a power supply method.
Background
In the production debugging process of some products, if one or a plurality of voltage sources are needed to provide voltage signals, one or a plurality of voltage sources are occupied, and under the condition that equipment resources are in short supply, the production schedule is delayed.
When a voltage signal source is needed in work, an engineer can directly use one small power source to achieve the purpose under the general condition, when a certain product needs a plurality of voltage signal sources, more power sources are occupied, and therefore resources are wasted, and progress is possibly delayed due to insufficient equipment.
due to the above conditions, the existing power source has large power loss, low working efficiency and resource shortage.
disclosure of Invention
In view of the foregoing analysis, embodiments of the present invention provide a signal source circuit and a power supply method based on a charger and a battery to solve the problems of large power consumption and low working efficiency of the existing power source.
The purpose of the invention is mainly realized by the following technical scheme:
A signal source circuit based on power supply of a charger and a battery is characterized by comprising a charger interface, a battery box interface, a single-pole double-throw switch and a buck-boost module;
the positive electrode of the charger interface and the positive electrode of the battery box interface are respectively connected with one immobile end of the single-pole double-throw switch; the power supply outputs a voltage signal after being transformed by the voltage boosting and reducing module;
The boost-buck module comprises a boost chip, an inductor L1, a capacitor C3 and a freewheeling diode D2; one end of the inductor L1 is connected with a positive power supply input end, the other end of the inductor L1 is connected with one end of a capacitor C3, and the other end of the capacitor C3 is connected with the anode of a freewheeling diode D2; the VIN end of the boost chip is connected with the positive input end of the power supply, the SWITCH end is connected with one end of the capacitor C3, and the GND end is connected with the negative input end of the power supply.
On the basis of the scheme, the invention is further improved as follows:
further, the charger interface comprises a mobile phone charger interface micro usb, a type-c and a notebook charger interface DC-005.
Further, the circuit also comprises a resistor R1 and a capacitor C2; one end of the resistor R1 is connected with the COMP end of the boost chip, the other end of the resistor R1 is connected with one end of the capacitor C2, and the other end of the capacitor C2 is connected with the negative input end of the power supply.
Further, the circuit also comprises a resistor R2 and a resistor R3; the resistor R2 is an adjustable resistor; one end of the resistor R2 is connected with one end of the resistor R3 and the FB end of the boost chip, and the slidable end and the other end are connected with the cathode of the freewheeling diode D2; the other end of the resistor R3 is connected with the negative input end of the power supply.
further, the output voltage of the signal source circuit is:
Vout＝1.23×(1+R2/R3)
In the formula of UFBRepresenting the voltage at the FB pin of the boost chip, UFB＝1.23V；
By changing the resistance ratio of the resistor R2 and the resistor R3, the magnitude of the output voltage is changed.
Furthermore, the circuit also comprises an energy storage inductor L2, wherein one end of the energy storage inductor L2 is connected with the anode of the freewheeling diode D2, and the other end is connected with the negative input end of the power supply.
Further, the circuit also includes input filter capacitors C1 and C6; and one ends of the input filter capacitors C1 and C6 are simultaneously connected with the positive input end of the power supply, and the other ends are simultaneously connected with the negative input end of the power supply.
Further, the circuit further comprises an output capacitor C4, wherein one end of the output capacitor C4 is connected with the cathode of the freewheeling diode D2, and the other end of the output capacitor C4 is connected with the negative input end of the power supply.
further, the value of the capacitance C3 is calculated by the following formula:
According to the relation between input and output:in the formula of UinRepresenting the voltage at the input port, U0Represents the voltage of the required output port, D represents the duty cycle;
Voltage fluctuation DeltaU0comprises the following steps: delta U0＝5％U0
Output current I0comprises the following steps:Wherein P represents the power of the output port;
The switching frequency is:in the formula, TonIndicating the turn-on time, T, of the transistor in the boost chipoffRepresenting the turn-off time of a triode in the boost chip;
the calculation formula of the capacitance C3 is as follows:
On the other hand, the embodiment of the invention provides a method for providing a signal source based on a charger and a battery-powered direct-current signal source circuit, which specifically comprises the following steps:
Building the direct current signal source circuit; the capacitance value of the capacitor C3 is expressed by the formuladetermining;
A charger is connected to the charger interface or a battery is connected to the battery box interface;
The corresponding interface of the charger or the battery is accessed through the single-pole double-throw switch gating;
adjusting the resistance ratio of the resistor R2 and the resistor R3 according to the output voltage of the required signal source to obtain the required voltage value Vout＝UFBx (1+ R2/R3) wherein UFBRepresenting the voltage at the FB pin of the boost chip.
compared with the prior art, the invention can realize at least one of the following beneficial effects:
1. the signal source circuit is built by adopting the battery or the charger which is easy to obtain, the effect of replacing a low-power direct current source by the output wide-range voltage is realized, a low-cost adjustable voltage signal source module is used for replacing partial functions of a power source, the realization is convenient, the equipment resource is saved, and the working efficiency is improved.
2. by adjusting the resistance value of R2, the effect of changing the output voltage is realized, so that the signal source circuit has wide applicability and is easy to implement.
3. The signal source module has the advantages of simple structure, small volume, light weight and easy implementation and carrying.
in the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
the drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a schematic diagram of a charger and battery powered DC signal source in one embodiment;
FIG. 2 is a schematic block diagram of the interior of LM2577 in one embodiment;
FIG. 3 is a voltage range test chart for one embodiment;
FIG. 4 is a diagram of a power supply for a cell phone charger in one embodiment;
FIG. 5 is a diagram illustrating the completion of an embodiment.
Detailed Description
the accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
in one embodiment of the present invention, a signal source circuit based on a charger and a battery is disclosed, as shown in fig. 1. The charger comprises a charger interface, a battery box interface, a single-pole double-throw switch and a buck-boost module; the positive pole of the charger interface and the positive pole of the battery box interface are respectively connected with one immobile end of the single-pole double-throw switch; the moving end of the single-pole double-throw switch is a positive power supply input end, the negative electrode of the charger interface and the negative electrode of the battery box interface are negative power supply input ends, and the power supply outputs a voltage signal after being boosted by the voltage boosting and reducing module. The boost-buck module comprises a boost chip, an inductor L1, a capacitor C3 and a freewheeling diode D2; one end of the inductor L1 is connected with the positive power supply input end, the other end is connected with one end of the capacitor C3, and the other end of the capacitor C3 is connected with the anode of the freewheeling diode D2; the VIN end of the boost chip is connected with the positive input end of the power supply, the SWITCH end is connected with one end of the capacitor C3, and the GND end is connected with the negative input end of the power supply.
The specific boost chip is realized by LM 2577.
When the dry battery is implemented, three dry batteries are selected and are arranged in the battery box to be connected in series for power supply.
the charger or the dry battery is used for supplying power, a wide range of voltage can be output to serve as a special voltage signal source, a low-power direct current source is replaced within the use range of the signal power level, resources are saved, and the working efficiency is improved. By the signal source circuit, the effect of replacing a low-power direct-current source with output wide-range voltage is achieved, and the working efficiency of the circuit is improved.
In practice, the voltage range is tested as shown in FIG. 3. As can be seen from the figure, the input voltage is 4V at the lowest, and the output voltage is 36V at the highest. The specific output parameters of the circuit designed this time are shown in the following table:
TABLE 1 main indices of DC signal source
| Main index item | Index parameter |
| Input voltage range | 4.0V～28.0V |
| Output voltage range | 1.5V～36.0V |
| Maximum output current | 3A |
| Maximum output power | 7W |
Preferably, the charger interface comprises a mobile phone charger interface micro usb, a type-c and a notebook charger interface DC-005; meanwhile, the charger interface and the battery interface are isolated by a single-pole double-throw switch.
Specifically, any one power supply mode of a micro usb interface, a type-c interface, a DC-005 interface and a battery box of the mobile phone charger can be selected. As shown in fig. 4, the charger interface is a power supply diagram of the mobile phone charger.
the charger interface and the battery interface are isolated by the single-pole double-throw switch, so that the problem of interference or damage possibly caused by simultaneous power supply is solved, and the working efficiency of the circuit is improved.
Preferably, the circuit further comprises a resistor R1 and a capacitor C2; one end of the resistor R1 is connected with the COMP end of the boost chip, the other end is connected with one end of the capacitor C2, and the other end of the capacitor C2 is connected with the negative input end of the power supply.
through resistance R1 and electric capacity C2, realized the compensation of boost chip LM2577, improved the stability of chip internal feedback loop.
specifically, an LM2577 boost chip is selected as a switch chip, and an internal schematic block diagram of the LM2577 chip is shown in fig. 2, where a voltage of an FB pin is 1.23V. The main parameters of the LM2577 chip are shown in the following table:
TABLE 2 LM2577 basic index table
Preferably, the circuit further comprises a resistor R2 and a resistor R3; the resistor R2 is an adjustable resistor, one end of the resistor R2 is connected with one end of the resistor R3 and the FB end of the boost chip, and the slidable end and the other end are connected with the cathode of the fly-wheel diode D2; the other end of the resistor R3 is connected with the negative input end of the power supply.
Preferably, the output voltage of the signal source circuit is:
Vout＝UFB×(1+R2/R3)
in the formula of UFBrepresenting the voltage at the FB pin of the boost chip, U in one embodiment of the inventionFB＝1.23V；
by adjusting the resistance value of R2, the effect of changing the output voltage is realized, so that the signal source circuit has wide applicability and is easy to implement.
Preferably, the circuit further comprises an energy storage inductor L2, wherein one end of the energy storage inductor L2 is connected with the anode of the freewheeling diode D2, and the other end is connected with the negative input end of the power supply.
through the inductor L2, the follow current of the circuit is realized when the triode in the boost chip is disconnected; when the triode is switched on, the energy is stored, so that the circuit outputs stable voltage and current.
Specifically, the inductance of the inductor L2 is the same as that of the inductor L1, so that the problem that other devices are damaged due to the fact that the inductor is possibly in failure due to inductor saturation is solved, and the reliability of the circuit is improved.
preferably, the circuit further comprises input filter capacitors C1 and C6 and an output capacitor C4; one end of each of the input filter capacitors C1 and C6 is simultaneously connected with a positive power supply input end, and the other end of each of the input filter capacitors C1 and C6 is simultaneously connected with a negative power supply input end; one end of the output capacitor C4 is connected with the cathode of the freewheeling diode D2, and the other end is connected with the negative input end of the power supply.
the effect of stabilizing the input voltage is realized through the capacitor C1; the noise removal effect of the circuit is realized through the capacitor C6; through output capacitor C4, the effect of stable output voltage has been realized, has improved the work efficiency of system.
Preferably, the value of the capacitance C3 is calculated by the following formula:
According to the relation between input and output:In the formula of UinRepresents the voltage of the input port, and has a minimum value of 4V, U0The voltage of the required output port is represented, the maximum value is 36V, and D represents the duty ratio;
voltage fluctuation DeltaU0Comprises the following steps: delta U0＝5％U0
output current I0Comprises the following steps:Wherein P represents the power of the output port;
The switching frequency is:in the formula, Tonindicating the turn-on time, T, of the transistor in the boost chipoffRepresenting the turn-off time of a triode in the boost chip;
the capacitance C3 is calculated as:
Specifically, the formula for calculating the capacitor C3 is given by the above formula, where the output voltage is the largest, and when the input voltage is the smallest, the duty ratio D is the largest, and the capacitance value of the capacitor C3 reaches the largest value. From the input voltage to output voltage relationship:Calculated Dmax0.9; the voltage fluctuation is not more than 5 percent (not the final ripple voltage, the output end is also provided with a filter capacitor) of the output voltage according to the industry standard, namely delta U0＝5％U01.8V, and the output current is 5% multiplied by 36Vswitching frequency fswaccording to the data of the boost chip, the data is 52 kHZ; bringing the above parameters intoThe calculation formula of the input capacitor C3 is as follows:Namely, the capacitance value of the capacitor C3 should not be lower than 17.3 muF, and the withstand voltage should exceed 28V (the highest input voltage), so the ceramic chip capacitance of 22 muF, 35V is selected.
After the main circuit is designed, two voltage meter heads can be added in the circuit to read the input voltage value and the output voltage value of the port. The actual object completion figure is shown in figure 5, and the voltage signal source module is small in size and can be placed in an inlet bag for carrying.
another embodiment of the present invention provides a method for providing a signal source based on a signal source circuit powered by a charger and a battery, including:
building a direct current signal source circuit; the capacitance value of the capacitor C3 is expressed by the formulaDetermining;
A charger is connected to the charger interface or a battery is connected to the battery box interface;
The corresponding interface of the charger or the battery is accessed through the single-pole double-throw switch gating;
adjusting the resistance ratio of the resistor R2 and the resistor R3 according to the output voltage of the required signal source to obtain the required voltage value Vout＝UFBX (1+ R2/R3) wherein UFBrepresenting the voltage at the FB pin of the boost chip.
The invention has novel concept, low cost and convenient circuit structure, and solves the problems of resource waste of a large-cost power supply, influence on practical use and the like due to insufficient resources of the conventional power supply.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. a signal source circuit based on power supply of a charger and a battery is characterized by comprising a charger interface, a battery box interface, a single-pole double-throw switch and a buck-boost module;
The positive electrode of the charger interface and the positive electrode of the battery box interface are respectively connected with one immobile end of the single-pole double-throw switch; the power supply outputs a voltage signal after being transformed by the voltage boosting and reducing module;
the boost-buck module comprises a boost chip, an inductor L1, a capacitor C3 and a freewheeling diode D2; one end of the inductor L1 is connected with a positive power supply input end, the other end of the inductor L1 is connected with one end of a capacitor C3, and the other end of the capacitor C3 is connected with the anode of a freewheeling diode D2; the VIN end of the boost chip is connected with the positive input end of the power supply, the SWITCH end is connected with one end of the capacitor C3, and the GND end is connected with the negative input end of the power supply.
2. the charger and battery powered based signal source circuit of claim 1, wherein the charger interface comprises a cell phone charger interface micro usb, type-c and a notebook charger interface DC-005.
3. The charger-and-battery-powered signal source circuit of claim 1, further comprising a resistor R1 and a capacitor C2;
One end of the resistor R1 is connected with the COMP end of the boost chip, the other end of the resistor R1 is connected with one end of the capacitor C2, and the other end of the capacitor C2 is connected with the negative input end of the power supply.
4. The charger-and-battery-powered signal source circuit as claimed in claim 1, further comprising a resistor R2 and a resistor R3;
The resistor R2 is an adjustable resistor;
One end of the resistor R2 is connected with one end of the resistor R3 and the FB end of the boost chip, and the slidable end and the other end are connected with the cathode of the freewheeling diode D2; the other end of the resistor R3 is connected with the negative input end of the power supply.
5. The charger-and-battery-powered signal source circuit as recited in claim 4, wherein the output voltage of the signal source circuit is:
Vout＝UFB×(1+R2/R3)
In the formula of UFBThe voltage of the FB pin of the boost chip is represented;
by changing the resistance ratio of the resistor R2 and the resistor R3, the magnitude of the output voltage is changed.
6. The signal source circuit based on the charger and the battery power supply as claimed in claim 1, further comprising an energy storage inductor L2, wherein one end of the energy storage inductor L2 is connected to the anode of the freewheeling diode D2, and the other end is connected to the negative input terminal of the power supply.
7. The charger-and-battery-powered signal source circuit of claim 1, further comprising input filter capacitors C1 and C6;
And one ends of the input filter capacitors C1 and C6 are simultaneously connected with the positive input end of the power supply, and the other ends are simultaneously connected with the negative input end of the power supply.
8. the charger-and-battery-powered signal source circuit as recited in claim 1, further comprising an output capacitor C4;
One end of the output capacitor C4 is connected with the cathode of the freewheeling diode D2, and the other end is connected with the negative input end of the power supply.
9. The charger and battery powered signal source circuit as claimed in claim 5, wherein the value of the capacitor C3 is calculated by the following equation:
According to the relation between input and output:
In the formula of UinRepresenting the voltage at the input port, U0Represents the voltage of the required output port, D represents the duty cycle;
voltage fluctuation DeltaU0Comprises the following steps: delta U0＝5％U0
output current I0Comprises the following steps:
Wherein P represents the power of the output port;
The switching frequency is:
In the formula, Tonindicating the turn-on time, T, of the transistor in the boost chipoffrepresenting the turn-off time of a triode in the boost chip;
The calculation formula of the capacitance C3 is as follows:
10. A method for providing a signal source based on a charger and a battery is characterized by comprising the following steps:
Building a direct current signal source circuit according to claim 9; the capacitance value of the capacitor C3 is expressed by the formulaDetermining;
a charger is connected to the charger interface or a battery is connected to the battery box interface;
the corresponding interface of the charger or the battery is accessed through the single-pole double-throw switch gating;
Adjusting the resistance ratio of the resistor R2 and the resistor R3 according to the output voltage of the required signal source to obtain the required voltage value Vout＝UFBX (1+ R2/R3) wherein UFBrepresenting the voltage at the FB pin of the boost chip.
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Application publication date: 20191217 |