CN108832666B - Detection device of transmission interface and power supply system - Google Patents
Detection device of transmission interface and power supply system Download PDFInfo
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- CN108832666B CN108832666B CN201810195526.8A CN201810195526A CN108832666B CN 108832666 B CN108832666 B CN 108832666B CN 201810195526 A CN201810195526 A CN 201810195526A CN 108832666 B CN108832666 B CN 108832666B
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- 238000001514 detection method Methods 0.000 title claims abstract description 133
- 230000005540 biological transmission Effects 0.000 title claims abstract description 49
- 238000002955 isolation Methods 0.000 claims abstract description 47
- 230000003287 optical effect Effects 0.000 claims description 31
- 239000003990 capacitor Substances 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 13
- 238000004804 winding Methods 0.000 description 5
- 230000032683 aging Effects 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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
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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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from AC mains by converters
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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
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/10—Control circuit supply, e.g. means for supplying power to the control circuit
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Voltage And Current In General (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to the field of intelligent power supply, in particular to a detection device of a transmission interface. The detection device comprises an isolation voltage reduction circuit, a control circuit and a detection circuit, wherein the detection circuit comprises a first detection end connected with a D+ pin or a D-pin of a transmission interface and a second detection end connected with a negative electrode of the transmission interface, and the control circuit comprises a signal output end which is respectively connected with the isolation voltage reduction circuit and the control circuit; when the first detection end and the second detection end of the control circuit are communicated, the control signal output end enters a first output state, and otherwise, the control signal output end enters a second output state. The invention also relates to a power supply system. The invention can safely, reliably and intelligently identify the connection condition of the to-be-charged power supply equipment, the charger and the adapter, and automatically determine whether to stop or start the work of the charger and the adapter according to the connection condition without human intervention.
Description
Technical Field
The invention relates to the field of intelligent power supply, in particular to a detection device of a transmission interface and a power supply system.
Background
With the increasing growth of portable electronic devices, such as mobile phones, IPAD, mobile computers, personal multimedia, etc., the demands and requirements for chargers and adapters are also increasing. In the current market, the charger and adapter circuits mainly adopt two topological structure circuits such as transformer feedback (shown in fig. 1) and optocoupler 431 feedback (shown in fig. 2), and the energy management standards of various countries have higher and higher requirements on the efficiency and standby of the two topological structures.
According to the standard of energy star six, the efficiency of the low-power charger and the adapter is greatly improved, and the standby time is required to be smaller than 100mW, and in the technical aspect, the working modes and the working currents of the main control chip U5 in the figure 1 and the main control chip U6 in the figure 2 can be adjusted by adopting secondary synchronous rectification.
At present, from the use experience of most users, after the portable device is fully charged or the adapter is not used, the portable device is only disconnected from the charger and the adapter, but the charger and the adapter are not disconnected from the alternating current power grid, that is, the charger and the adapter still work, and still have output voltage and still have standby power consumption of at least 100 mW.
And, long-time, uninterrupted operation may cause the HV pin-in power device of the main control chip U5 of fig. 1, and the transformer T2, and the DRAN pin-in power device of the main control chip U6 of fig. 2, and the transformer T3 to be destroyed by aging. In fig. 1 and fig. 2, the power device built in the main control chip works at a voltage of about 300V and at a standby frequency of 300Hz-5KHz, and electromagnetic pollution is also generated to the power grid.
In some public places, the charging service is provided for free, and the charger and the adapter basically work continuously throughout the year. Particularly, a plurality of intelligent sockets and panels are arranged, the charger and the adapter are directly arranged in the sockets and the panels, and the phenomenon that one main control chip is provided with a plurality of charging ports for outputting is also caused, so that the problem of energy waste and electromagnetic pollution is solved when the main control chip is not charged, and the problem of great safety is solved.
In view of the foregoing, it is highly desirable to provide a circuit that can intelligently identify whether a portable device is connected to a charger or an adapter, and determine whether the charger or the adapter is operating or outputting power according to the connection condition. The problem to be solved is simply technically without difficulty, but is limited by other factors, which lead to no currently commercially acceptable solution, for the following reasons:
1. the cost of the added intelligent recognition control circuit cannot exceed the cost of the charger and the adapter, and the cost must be lower;
2. the size of the intelligent recognition control circuit is increased, and the volume of the intelligent recognition control circuit is required to be far smaller than that of a charger and an adapter, otherwise, the user experience and the power density are affected;
3. the power consumption of the added intelligent recognition control circuit is required to be one order of magnitude lower than the current 100mW, and the power consumption is required to be below 10mW, otherwise, the intelligent recognition control circuit has no meaning;
4. electromagnetic compatibility, under no-charge condition, the high voltage parts in fig. 1 and 2 must stop working to prevent electromagnetic pollution.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a detection device of a transmission interface aiming at the defects in the prior art, so that the problems of energy waste, electromagnetic interference pollution to a power grid and the environment, safety accidents caused by aging of components and the like caused by standby and no shutdown of a charger and an adapter in the current market are solved, and the detection device has great economic and social benefits.
The technical problem to be solved by the invention is to provide a power supply system aiming at the defects in the prior art, so that the problems of energy waste, electromagnetic interference pollution to a power grid and the environment, safety accidents caused by aging of components and the like caused by standby of a charger and an adapter without shutdown in the current market are solved, and the power supply system has great economic and social benefits.
The technical scheme adopted for solving the technical problems is as follows: the detection device comprises an isolation voltage reduction circuit, a control circuit and a detection circuit, wherein the detection circuit comprises a first detection end connected with a D+ pin or a D-pin of the transmission interface and a second detection end connected with a negative electrode of the transmission interface, and the control circuit comprises a signal output end, and the detection circuit is respectively connected with the isolation voltage reduction circuit and the control circuit; when the first detection end and the second detection end of the control circuit are communicated, the control signal output end enters a first output state, and otherwise, the control signal output end enters a second output state.
Among them, the preferred scheme is: the control circuit further comprises a first triode and a first optical coupler, wherein the base electrode of the first triode is respectively connected with the first detection end and the output end of the isolation voltage reduction circuit, the primary side of the first optical coupler is respectively connected with the output end of the isolation voltage reduction circuit and the collector electrode of the first triode, and the secondary side of the first optical coupler is respectively connected with the signal output end and the ground end; the first triode is disconnected when the first detection end and the second detection end are connected, the first optical coupler is controlled to be disconnected, and the signal output end does not output a signal; and the first triode is conducted when the first detection end and the second detection end are disconnected when the first triode is connected, the first optical coupler is controlled to be conducted, and the signal output end is grounded.
Among them, the preferred scheme is: the detection device comprises a second optical coupler and a second triode, wherein the secondary side of the second triode and the secondary side of the second optical coupler form a control circuit, the primary side of the second optical coupler, the first detection end and the second detection end form a detection circuit, the primary side of the second optical coupler is respectively connected with the first detection end and the output end of the isolation voltage reduction circuit, the base electrode of the second triode is respectively connected with the secondary side of the second optical coupler and the input end of the isolation voltage reduction circuit, the collector electrode of the second triode is connected with the signal output end, and the emitter electrode of the second triode is grounded; the second optical coupler is conducted when the first detection end and the second detection end are communicated, and controls the second triode to be disconnected, and the signal output end does not output a signal; and the second optical coupler is disconnected when the first detection end and the second detection end are connected, and controls the second triode to be conducted, and the signal output end is grounded.
Among them, the preferred scheme is: the isolation voltage reducing circuit comprises a voltage reducing circuit and an isolation circuit, wherein the isolation circuit comprises a clock chip, a third triode and a first transformer, the base electrode of the third triode is connected with the ck control end of the clock chip, the input unit of the voltage reducing circuit is connected with a power supply, the primary coil of the first transformer is respectively connected with the output end of the voltage reducing circuit and the collector electrode of the third triode, and the secondary coil of the first transformer is used as the output end of the voltage reducing circuit.
Among them, the preferred scheme is: the first transformer is a high frequency power transformer.
Among them, the preferred scheme is: the voltage reducing circuit comprises a fourth triode, wherein the base electrode of the fourth triode is connected with the positive electrode of the power supply through a resistor and grounded through a voltage stabilizing diode, the collector electrode of the fourth triode is connected with the positive electrode of the power supply, and the emission set of the fourth triode is respectively connected with the primary coil of the first transformer and vdd of the clock chip and grounded through a capacitor.
The clock chip comprises a sawtooth wave generator with a first operational amplifier and a duty ratio regulating and driving circuit with a second operational amplifier, wherein the in-phase of the first operational amplifier is grounded through a resistor, the opposite phase of the first operational amplifier is grounded through a capacitor, the output end of the first operational amplifier is connected with the in-phase of the second operational amplifier, the opposite phase of the first operational amplifier is connected with a pull-up resistor, and the output end of the first operational amplifier is used as a ck control end.
The technical scheme adopted for solving the technical problems is as follows: the power supply system comprises a detection device and a power supply circuit, wherein the power supply circuit comprises a power input end, a main control circuit, a second transformer and a transmission interface, a primary coil of the second transformer is respectively connected with the power input end and the main control circuit, a secondary coil of the second transformer is connected with the transmission interface, the power input end is connected with the input end of an isolation voltage reduction circuit of the detection device and is also connected with the power end of the main control circuit through a resistor, and the power end of the main control circuit is also connected with the signal output end of the detection device; the main control circuit is connected with the power input end when the signal output end does not output a signal, and controls the power supply circuit to work; and the main control circuit is grounded when the signal output end is grounded, and the power supply circuit stops working.
Among them, the preferred scheme is: the power supply circuit is a charging circuit or an adapting circuit.
Among them, the preferred scheme is: the power supply system comprises a plurality of transmission interfaces, a first detection end of the detection device is connected with a D+ pin or a D-pin of each transmission interface respectively, and a second detection end of the detection device is connected with a negative electrode of each transmission interface respectively.
Compared with the prior art, the invention can safely, reliably and intelligently identify the connection conditions of the equipment to be charged and the power supply, the charger and the adapter, and automatically determine whether to stop or start the operation of the charger and the adapter according to the connection conditions without human intervention, thereby having the advantages of high safety, low power consumption, small volume and low cost; the problems of energy waste, electromagnetic interference pollution to the power grid and the environment, safety accidents caused by aging of components and parts and the like, which are caused by standby of chargers and adapters in the current market without shutdown, are solved, and the method has great economic and social benefits.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic circuit diagram of a prior art power supply circuit employing transformer feedback;
FIG. 2 is a schematic circuit diagram of a prior art power supply circuit employing optocoupler 431 feedback;
FIG. 3 is a block diagram of the detection device of the present invention;
FIG. 4 is a block diagram of the detection device based on the isolated step-down circuit of the present invention;
FIG. 5 is a schematic circuit diagram of a detection device of the present invention;
FIG. 6 is a schematic diagram of a second circuit of the detection device of the present invention;
FIG. 7 is a schematic circuit diagram of a clock chip of the present invention;
FIG. 8 is a block diagram of the power supply system of the present invention;
FIG. 9 is a block diagram of the power supply circuit of the present invention;
FIG. 10 is a schematic circuit diagram of a power supply system of the present invention;
FIG. 11 is a schematic diagram of a power supply system of the present invention;
FIG. 12 is a schematic circuit diagram of a power supply system based on multiple transmission interfaces according to the present invention;
fig. 13 is a schematic circuit diagram of a power supply system based on multiple transmission interfaces according to the present invention.
Detailed Description
Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 3 and 4, the present invention provides a preferred embodiment of a detection device for a transmission interface.
A detection device of a transmission interface 20, the detection device comprises an isolation voltage dropping circuit 11, a control circuit 13 and a detection circuit 12, the detection circuit 12 comprises a first detection end 121 connected with a D+ pin or a D-pin of the transmission interface 20, and a second detection end 122 connected with a negative electrode of the transmission interface 20, the control circuit 13 comprises a signal output end 131, and the detection circuit 12 is respectively connected with the isolation voltage dropping circuit 11 and the control circuit 13; when the first detection end 121 and the second detection end 122 are communicated, the control circuit 13 controls the signal output end 131 to enter the first output state, and otherwise, controls the signal output end 131 to enter the second output state.
Specifically described below:
in the transmission interface 20, the transmission interface 20 is preferably a USB interface, or may be another power supply interface, where the interface is generally a female interface, and when an external interface (sub-port) is inserted into the transmission interface 20, the first detection end 121, a d+ pin or D-pin of the transmission interface 20, a negative electrode of the transmission interface 20, and the second detection end 122 are connected, and meanwhile, an anode of the power supply 30, an anode of the isolation step-down circuit 11, the first detection end 121, a d+ pin or D-pin of the transmission interface 20, a negative electrode of the transmission interface 20, the second detection end 122, a negative electrode of the isolation step-down circuit 11, and a negative electrode of the power supply 30 are connected, and after the isolation step-down circuit 11 and the detection circuit 12 are connected, the control circuit 13 controls the signal output end 131 to enter the first output state; when the external control chip recognizes that the control signal output end 131 enters the first output state, corresponding operation is performed, for example, the control transmission interface 20 is powered on; otherwise, the control signal output end 131 enters the second output state, and the external control chip recognizes that the control signal output end 131 enters the second output state, and performs corresponding operations, such as controlling the transmission interface 20 to be powered off.
In this embodiment, two preferred solutions of the detection device are provided.
Scheme one, and referring to fig. 5.
The control circuit 13 further includes a first triode Q5 and a first optocoupler U2, where a base electrode of the first triode Q5 is connected to the first detection end 121 and an output end of the isolation buck circuit 11, and a primary side of the first optocoupler U2 is connected to the output end of the isolation buck circuit 11 and a collector electrode of the first triode Q5, and a secondary side of the first optocoupler U2 is connected to the signal output end 131 and a ground end; the first triode Q5 is disconnected when the first detection end 121 and the second detection end 122 are connected, and controls the first optocoupler U2 to be disconnected, and the signal output end 131 does not output a signal; and, the first transistor Q5 is turned on when the first detection terminal 121 and the second detection terminal 122 are turned off, and controls the first optocoupler U2 to be turned on, and the signal output terminal 131 is grounded.
Specifically, when the first detection end 121 and the second detection end 122 are connected, that is, the first detection end 121, the d+ pin or D-pin of the transmission interface 20, the negative electrode of the transmission interface 20, and the second detection end 122 are connected, the isolation voltage reduction circuit 11 and the first detection end 121 and the second detection end 122 form a loop, the current of the isolation voltage reduction circuit 11 enters the branch of the resistor R1 through the output end thereof, the first triode Q5 is disconnected, that is, the collector and the emitter of the first triode Q5 are not conducted, the primary side of the first optocoupler U2 is not electrified, the secondary side of the first optocoupler U2 is disconnected, and the signal output end 131VCC does not output a signal.
And when the first detection end 121 and the second detection end 122 are disconnected, the isolation voltage reduction circuit 11 and the first detection end 121 cannot form a loop, the positive electrode of the isolation voltage reduction circuit 11 provides a bias voltage for the first triode Q5 through the resistor R1, the first triode Q5 is turned on, that is, the collector and the emitter of the first triode Q5 are turned on, the primary side of the first optocoupler U2 is turned on, that is, the positive electrode of the isolation voltage reduction circuit 11 supplies power to the primary side of the first optocoupler U2 through the resistor R4, the secondary side of the first optocoupler U2 is grounded along with the path, and the signal output end 131VCC is grounded.
Scheme two, and refer to fig. 6.
The detection device comprises a second optical coupler U1 and a second triode Q4, wherein the second triode Q4 and the secondary side of the second optical coupler U1 form a control circuit 13, the primary side of the second optical coupler U1, a first detection end 121 and a second detection end 122 form a detection circuit 12, the primary side of the second optical coupler U1 is respectively connected with the first detection end 121 and the output end of the isolation voltage reduction circuit 11, the base electrode of the second triode Q4 is respectively connected with the secondary side of the second optical coupler U1 and the input end of the isolation voltage reduction circuit 11, the collector electrode of the second triode Q is connected with the signal output end 131, and the emitter electrode of the second triode Q is grounded; the second optical coupler U1 is turned on when the first detection end 121 is connected to the second detection end 122, and controls the second triode Q4 to be turned off, and the signal output end 131 does not output a signal; and, the second optocoupler U1 is turned off when the first detection terminal 121 and the second detection terminal 122 are connected, and controls the second transistor Q4 to be turned on, and the signal output terminal 131 is grounded.
Specifically, when the first detection end 121 and the second detection end 122 are connected, that is, the first detection end 121, the d+ pin or the D-pin of the transmission interface 20, the negative electrode of the transmission interface 20, and the second detection end 122 are connected, the isolation voltage reduction circuit 11 and the first detection end 121 and the second detection end 122 form a loop, the current of the isolation voltage reduction circuit 11 enters the branch of the resistor R4 through the output end thereof, the primary side of the second optocoupler U1 is electrified, the secondary side thereof is conducted, the current of the positive electrode VIN of the power supply 30 goes to the ground through the resistor R5, the secondary side of the second optocoupler U1, the second triode Q4 is disconnected, that is, the collector and the emitter of the second triode Q4 are not conducted, and the signal output end 131VCC does not output a signal.
And when the first detection end 121 and the second detection end 122 are disconnected, the isolation voltage reduction circuit 11 and the first detection end 121 cannot form a loop, the primary side of the second optocoupler U1 is not electrified, the secondary side thereof is disconnected, the positive pole VIN of the power supply 30 provides bias voltage for the base electrode of the second triode Q4 through the resistor R5, the second triode Q4 is conducted, and the signal output end 131VCC is grounded.
The optical coupler is used for isolation control, and has the advantages of simple structure, small volume and low cost.
As shown in fig. 5 to 7, the present invention provides a preferred embodiment of a voltage step-down circuit.
The isolation step-down circuit 11 comprises a step-down circuit 111 and an isolation circuit 112, the isolation circuit 112 comprises a clock chip (clock gen), a third triode Q2 and a first transformer T1, a base electrode of the third triode Q2 is connected with a ck control end of the clock chip, an input unit of the step-down circuit 111 is connected with the power supply 30, a primary coil of the first transformer T1 is respectively connected with an output end of the step-down circuit 111 and a collector electrode of the third triode Q2, and a secondary coil of the first transformer T1 is used as an output end of the step-down circuit 111.
Specifically, and referring to fig. 7, the clock chip includes a sawtooth wave generator with a first operational amplifier U3 and a duty cycle adjusting and driving circuit with a second operational amplifier U4, where the first operational amplifier U3 is grounded through a resistor R6, its opposite phase is grounded through a capacitor C3, its output terminal is connected to the second operational amplifier U4 through a resistor R8, further, the first operational amplifier U3 is connected to the output terminal of the resistor R8 through a resistor R7, and its opposite phase is connected to the output terminal of the resistor R8 through a resistor R9; the inverse phase of the second operational amplifier U4 is connected to the pull-up resistor R10, and further, the inverse phase of the second operational amplifier U4 is grounded through the resistor R11, and the output end of the second operational amplifier U4 is used as the ck control end. And the light passing zener diodes DZ3 and DZ4 are grounded between the resistor R8 and the same phase of the second operational amplifier U4.
The clock chip adopts a double operational amplifier structure to generate square waves with a certain duty ratio and frequency for realizing power conversion, and the problems of insufficient driving capability, cost and power consumption caused by the realization of complex chips such as a singlechip or a 555 timer are avoided.
Further, the secondary winding of the first transformer T1 is further connected to a rectifying and filtering circuit, the rectifying and filtering circuit includes a diode D1 connected to an output end of the secondary winding of the first transformer T1, a capacitor C2 connected in parallel to the secondary winding of the first transformer T1, a resistor R2 and a resistor R3 connected in series with each other, and a triode Q3, where a base of the triode Q3 is connected to a node of the resistor R2 and the resistor R3, and a collector of the triode Q3 is connected to an output end of the secondary winding of the first transformer T1, and an emitter thereof is grounded.
Preferably, the first transformer T1 is a high frequency power transformer. Because the output transformation ratio is small, the power is low, the volume can be made very small, and the problems of large volume, high power consumption and high price caused by adopting a power frequency transformer are avoided.
In this embodiment, the step-down circuit 111 includes a fourth triode Q1, wherein a base electrode of the fourth triode Q1 is connected to the positive electrode VIN of the power supply 30 through a resistor R1 and is grounded through a zener diode DZ1, a collector electrode of the fourth triode Q1 is connected to the positive electrode VIN of the power supply 30, and an emitter of the fourth triode Q1 is respectively connected to a primary coil of the first transformer T1 and vdd of the clock chip and is grounded through a capacitor C1.
Further, the power supply 30 is stepped down to a voltage of 5V by the step-down circuit 111, and is stepped down again to a voltage of 2.5V by the isolation circuit 112.
Preferably, the step-down circuit 111 is an ultra-low power consumption isolation circuit 112, and the voltage stress born by the device in the switch changer for providing the ultra-low power consumption isolation power source 30,5V to 2.5V for the detection device is very small, so that the device can work continuously for a long time, the problems of excessive loss and overheat are avoided, the cost is reduced, the size is small, and the electromagnetic pollution is avoided.
As shown in fig. 8 and 9, the present invention provides a preferred embodiment of a power supply system.
The power supply system comprises a detection device 41 and a power supply circuit 42, wherein the power supply circuit 42 comprises a power input end 422, a main control circuit 424, a second transformer 423 and a transmission interface 421, a primary coil of the second transformer 423 is respectively connected with the power input end 422 and the main control circuit 424, a secondary coil of the second transformer 423 is connected with the transmission interface 421, the power input end 422 is connected with an input end of an isolation step-down circuit of the detection device 41 and is also connected with a power end of the main control circuit 424 through a resistor, and a power end of the main control circuit 424 is also connected with a signal output end of the detection device 41; the main control circuit 424 is connected to the power input terminal 422 when the signal output terminal does not output a signal, and controls the power supply circuit 42 to operate; and the main control circuit 424 is grounded when the signal output terminal is grounded, and the power supply circuit 42 stops working.
In the present embodiment, two preferred solutions of the detection device 41 are provided.
Scheme one, referring to fig. 10, a charging circuit for power supply circuit 42 is employed.
The power input end 422 includes a L, N input end, and inputs the input end to the bridge rectifier circuit DB1, and the output end thereof is respectively connected to the primary winding of the transformer T2 and leads out an output power end VIN to supply power to the detecting device 41; the transformer T2 is connected to the HV pin of the main control chip U5, and its power supply terminal VCC is connected to the signal output terminal VCC of the detecting device 41 and is controlled by the signal output terminal VCC of the detecting device 41. The main control circuit 424 includes a main control chip U5, i.e. a peripheral circuit, and the second transformer 423 includes a transformer T2 and a peripheral circuit.
When the signal output terminal VCC does not output a signal, the output terminal power resistor R12 of the power input terminal 422 supplies power to the power terminal VCC of the main control chip U5, and the main control chip U5 works to make the power input terminal 422, the main control circuit 424 and the second transformer 423 form a loop, and the transmission interface 421 is powered on.
When the signal output terminal VCC is grounded, the power supply terminal VCC of the main control chip U5 is grounded, and the main control chip U5 stops working, so that the power supply input terminal 422, the main control circuit 424, and the second transformer 423 cannot form a loop, and the transmission interface 421 is powered off.
Scheme II, referring to FIG. 11, an adaptation circuit for the power supply circuit 42 is employed.
The circuit of the adaptation circuit is substantially the same as the supply circuit 42, mainly the feedback parts of the adaptation circuit are different, and will not be described again.
As shown in fig. 12 and 13, the present invention provides a preferred embodiment of a power supply system based on multiple transmission interfaces.
The power supply system comprises a plurality of transmission interfaces 421, a first detection end of the detection device 41 is respectively connected with a d+ pin or a D-pin of each transmission interface 421, and a second detection end of the detection device 41 is respectively connected with a negative electrode of each transmission interface 421.
The foregoing description of the preferred embodiments of the present invention is not intended to limit the scope of the invention, but rather is intended to cover all modifications and variations within the scope of the present invention as defined in the appended claims.
Claims (5)
1. A detection device of a transmission interface, which is characterized in that: the detection device comprises an isolation voltage reduction circuit, a control circuit and a detection circuit, wherein the detection circuit comprises a first detection end connected with a D+ pin or a D-pin of a transmission interface and a second detection end connected with a negative electrode of the transmission interface, and the control circuit comprises a signal output end which is respectively connected with the isolation voltage reduction circuit and the control circuit; when the first detection end and the second detection end of the control circuit are communicated, the control signal output end enters a first output state, otherwise, the control signal output end enters a second output state;
the control circuit further comprises a first triode and a first optical coupler, wherein the base electrode of the first triode is respectively connected with the first detection end and the output end of the isolation voltage reduction circuit, the primary side of the first optical coupler is respectively connected with the output end of the isolation voltage reduction circuit and the collector electrode of the first triode, and the secondary side of the first optical coupler is respectively connected with the signal output end and the ground end; the first triode is disconnected when the first detection end and the second detection end are connected, the first optical coupler is controlled to be disconnected, and the signal output end does not output a signal; the first triode is conducted when the first detection end and the second detection end are disconnected when the first triode is connected, the first optical coupler is controlled to be conducted, and the signal output end is grounded; or the detection device comprises a second optical coupler and a second triode, wherein the secondary side of the second triode and the secondary side of the second optical coupler form a control circuit, the primary side of the second optical coupler, the first detection end and the second detection end form a detection circuit, the primary side of the second optical coupler is respectively connected with the first detection end and the output end of the isolation voltage reduction circuit, the base electrode of the second triode is respectively connected with the secondary side of the second optical coupler and the input end of the isolation voltage reduction circuit, the collector electrode of the second triode is connected with the signal output end, and the emitter electrode of the second triode is grounded; the second optical coupler is conducted when the first detection end and the second detection end are communicated, and controls the second triode to be disconnected, and the signal output end does not output a signal; the second optical coupler is disconnected when the first detection end and the second detection end are connected, and controls the second triode to be conducted, and the signal output end is grounded;
the isolation voltage reducing circuit comprises a voltage reducing circuit and an isolation circuit, wherein the isolation circuit comprises a clock chip, a third triode and a first transformer, the base electrode of the third triode is connected with the ck control end of the clock chip, the input unit of the voltage reducing circuit is connected with a power supply, the primary coil of the first transformer is respectively connected with the output end of the voltage reducing circuit and the collector electrode of the third triode, and the secondary coil of the first transformer is used as the output end of the voltage reducing circuit;
the first transformer is a high-frequency power transformer;
the voltage reducing circuit comprises a fourth triode, wherein the base electrode of the fourth triode is connected with the positive electrode of the power supply through a resistor and grounded through a voltage stabilizing diode, the collector electrode of the fourth triode is connected with the positive electrode of the power supply, and the emission set of the fourth triode is respectively connected with the primary coil of the first transformer and vdd of the clock chip and grounded through a capacitor.
2. The detection apparatus according to claim 1, wherein: the clock chip comprises a sawtooth wave generator with a first operational amplifier and a duty ratio regulating and driving circuit with a second operational amplifier, wherein the in-phase of the first operational amplifier is grounded through a resistor, the opposite phase of the first operational amplifier is grounded through a capacitor, the output end of the first operational amplifier is connected with the in-phase of the second operational amplifier, the opposite phase of the first operational amplifier is connected with a pull-up resistor, and the output end of the first operational amplifier is used as a ck control end.
3. A power supply system, characterized by: the power supply system comprises the detection device and a power supply circuit as claimed in claim 1 or 2, wherein the power supply circuit comprises a power input end, a main control circuit, a second transformer and a transmission interface, a primary coil of the second transformer is respectively connected with the power input end and the main control circuit, a secondary coil of the second transformer is connected with the transmission interface, the power input end is connected with the input end of an isolation voltage reduction circuit of the detection device, and is also connected with the power end of the main control circuit through a resistor, and the power end of the main control circuit is also connected with the signal output end of the detection device; the main control circuit is connected with the power input end when the signal output end does not output a signal, and controls the power supply circuit to work; and the main control circuit is grounded when the signal output end is grounded, and the power supply circuit stops working.
4. A power supply system according to claim 3, characterized in that: the power supply circuit is a charging circuit or an adapting circuit.
5. A power supply system according to claim 3, characterized in that: the power supply system comprises a plurality of transmission interfaces, a first detection end of the detection device is connected with a D+ pin or a D-pin of each transmission interface respectively, and a second detection end of the detection device is connected with a negative electrode of each transmission interface respectively.
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| CN201810195526.8A CN108832666B (en) | 2018-03-09 | 2018-03-09 | Detection device of transmission interface and power supply system |
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| CN201810195526.8A CN108832666B (en) | 2018-03-09 | 2018-03-09 | Detection device of transmission interface and power supply system |
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| CN108832666B true CN108832666B (en) | 2024-04-02 |
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