CN214544139U - Power supply with multiple inputs - Google Patents
Power supply with multiple inputs Download PDFInfo
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- CN214544139U CN214544139U CN202023201698.3U CN202023201698U CN214544139U CN 214544139 U CN214544139 U CN 214544139U CN 202023201698 U CN202023201698 U CN 202023201698U CN 214544139 U CN214544139 U CN 214544139U
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Abstract
The utility model discloses a power supply of multichannel input, including AC conversion circuit, DC conversion circuit, voltage feedback circuit, first opto-coupler and second opto-coupler, be used for converting the input alternating current into first low voltage direct current through AC conversion circuit; the direct current conversion circuit is used for converting the input direct current into the first low-voltage direct current; one end of the voltage feedback circuit is connected with the output end of the first low-voltage direct current; the input end of the first optical coupler is connected with the voltage feedback circuit, and the output end of the first optical coupler is connected with the voltage feedback end of the alternating current conversion circuit; the input end of the second optical coupler is connected with the voltage feedback circuit, and the output end of the second optical coupler is connected with the voltage feedback end of the direct current conversion circuit. Therefore, the input voltage of 220V, 110V or three direct current paths can be used as an input power supply, the output voltage of 19V is used for supplying power for a notebook computer or 5V is used for supplying power for a mobile phone, and the use of a user is facilitated.
Description
Technical Field
The utility model relates to a power technical field especially relates to a power supply of multichannel input.
Background
The power supply charger takes alternating current or direct current as an input power supply, and outputs direct current voltage to charge the electronic equipment after voltage conversion. In existing charging power supplies, only one input supply voltage is typically supported. For example, 110V, 220V or one of 5V. The input supply voltage is then converted into a supply voltage for the electronic device. For example, 19V or 5V. However, the applicability of a charging device that supports only one input power source is relatively poor. Especially for users who travel across the country for a long time or go on a business trip, the situation that the electronic device cannot be charged due to the fact that the appropriate input power source is not available may occur.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, an object of the present invention is to provide a power supply with multiple inputs.
In order to achieve the above object, according to the present invention, a power supply for multi-path input comprises:
an AC conversion circuit for converting an input AC power to a first low voltage DC power;
the output end of the direct current conversion circuit is connected with the output end of the alternating current conversion circuit, and the direct current conversion circuit is used for converting the input direct current into the first low-voltage direct current;
one end of the voltage feedback circuit is connected with the output end of the first low-voltage direct current;
the input end of the first optical coupler is connected with the voltage feedback circuit, and the output end of the first optical coupler is connected with the voltage feedback end of the alternating current conversion circuit;
and the input end of the second optical coupler is connected with the voltage feedback circuit, and the output end of the second optical coupler is connected with the voltage feedback end of the direct current conversion circuit.
Further, according to an embodiment of the present invention, the ac conversion circuit includes:
the alternating current-direct current conversion circuit is used for converting input alternating current into high-voltage direct current;
the transformer circuit comprises a transformer, and one end of a primary coil of the transformer is connected with the high-voltage direct-current output end of the alternating-current and direct-current conversion circuit;
the drain electrode of the switching tube is connected with the other end of the primary coil of the transformer, and the source electrode of the switching tube is connected with the reference ground;
the pulse output control end of the pulse modulation controller is connected with the grid electrode of the switching tube;
and one end of the first direct current filter circuit is connected with the secondary coil of the transformer so as to filter and stabilize the output voltage of the secondary coil into the first low-voltage direct current.
Further, according to an embodiment of the present invention, the dc conversion circuit includes:
the boost inductor is connected with the input direct current at one end;
the drain electrode of the first MOS switch tube is connected with the other end of the boosting inductor, and the source electrode of the first MOS switch tube is connected with a reference ground;
a second MOS switch tube, wherein a source electrode of the second MOS switch tube is connected with the other end of the boosting inductor;
the two control ends of the boost controller are respectively connected with the grid electrode of the first MOS switch tube and the grid electrode of the second MOS switch tube so as to control the boost of the output voltage of the boost inductor through the first MOS switch tube and the second MOS switch tube;
and one end of the second direct current filter circuit is connected with the drain electrode of the second MOS switch tube so as to filter and stabilize the output voltage of the second MOS switch tube into the first low-voltage direct current.
Further, according to the utility model discloses an embodiment, the power supply of multichannel input still includes USB power supply circuit, USB power supply circuit with first low voltage direct current's output is connected, with will first low voltage direct current converts USB supply voltage into.
Further, according to an embodiment of the present invention, the voltage feedback circuit includes:
the voltage division circuit comprises a resistor R10 and a resistor R22, one end of the resistor R10 is connected with the output end of the first low-voltage direct current, the other end of the resistor R10 is connected with one end of the resistor R22, and the other end of the resistor R22 is connected with a reference ground;
a voltage comparison end of the controllable precision voltage stabilizer is connected with a common end of the resistor R10 and the resistor R22, an anode end of the controllable precision voltage stabilizer is connected with a reference ground, and a cathode end of the controllable precision voltage stabilizer is connected with an output end of the first low-voltage direct current through a resistor R17 and a resistor R9;
the cathode end of the controllable precision voltage stabilizer is connected with one end of a resistor R17, the other end of the resistor R17 is connected with one end of a resistor R9, and the other end of the resistor R9 is connected with the output end of the first low-voltage direct current.
Further, according to an embodiment of the present invention, two ends of the light emitting diode of the first optical coupler are connected to two ends of the resistor R17, an emitter of the photo triode end of the first optical coupler is connected to a reference ground, and a collector of the photo triode end of the first optical coupler is connected to the voltage feedback end of the pulse modulation controller;
two ends of a light emitting diode of the second optical coupler are connected with two ends of the resistor R17, an emitter of a photosensitive triode end of the second optical coupler is connected with a reference ground, and a collector of the photosensitive triode end of the first optical coupler is connected with a voltage feedback end of the boost controller.
Further, according to an embodiment of the present invention, the USB power circuit includes:
the DC-DC voltage conversion module is connected with an input end and an output end of the first low-voltage direct current so as to convert the first low-voltage direct current into a USB power supply voltage;
a USB identification controller;
and the USB interface is respectively connected with the USB identification controller and the DC-DC voltage conversion module so as to identify the USB equipment and output a USB power supply.
Further, according to the utility model discloses an embodiment, the first direct current filter circuit includes:
a synchronous rectification MOS tube Q1, wherein the drain electrode of the synchronous rectification MOS tube Q1 is connected with one end of the secondary coil of the transformer, and the source electrode of the synchronous rectification MOS tube Q1 outputs the first low-voltage direct current;
and the detection end of the synchronous rectification controller is connected with one end of the secondary coil of the transformer through a resistor R37, and the other end of the synchronous rectification controller is connected with the grid electrode of the synchronous rectification MOS tube Q1.
And the positive end of the capacitor EC3 is connected with the other end of the secondary coil of the transformer, and the negative end of the capacitor EC3 is connected with the ground reference.
Further, according to an embodiment of the present invention, the ac conversion circuit further includes: and the source electrode of the switching tube is connected with the reference ground through the current detection circuit, and is also connected with the voltage feedback end of the pulse modulation controller.
The utility model provides a power supply with multi-path input, which is used for converting input alternating current into first low-voltage direct current through an alternating current conversion circuit; the output end of the direct current conversion circuit is connected with the output end of the alternating current conversion circuit, and the direct current conversion circuit is used for converting input direct current into first low-voltage direct current; one end of the voltage feedback circuit is connected with the output end of the first low-voltage direct current; the input end of the first optical coupler is connected with the voltage feedback circuit, and the output end of the first optical coupler is connected with the voltage feedback end of the alternating current conversion circuit; the input end of the second optical coupler is connected with the voltage feedback circuit, and the output end of the second optical coupler is connected with the voltage feedback end of the direct current conversion circuit. Therefore, the input voltage of 220V, 110V or three direct current paths can be used as an input power supply, the output voltage of 19V is used for supplying power for a notebook computer or 5V is used for supplying power for a mobile phone, and the use of a user is facilitated.
Drawings
Fig. 1 is a block diagram of a power supply structure with multiple inputs according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a circuit structure of an ac conversion circuit, a voltage feedback circuit, a first optical coupler, and a second optical coupler provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a dc conversion circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a USB power circuit structure provided in an embodiment of the present invention.
Reference numerals:
an AC conversion circuit 10;
a first/second road ac input interface 101;
an ac-dc conversion circuit 102;
a transformer circuit 103;
a first dc filter output circuit 104;
a switching tube 105;
a pulse modulation controller 106;
a direct current conversion circuit 20;
a direct current input interface 201;
a dc voltage conversion circuit 202;
a second dc filter output circuit 203;
a voltage feedback circuit 30;
a first optical coupler 40;
a second optical coupler 50;
a USB power supply circuit 60;
a dc output interface 70.
The purpose of the present invention is to provide a novel and improved method and apparatus for operating a computer.
Detailed Description
In order to make the technical field person understand the scheme of the present invention better, the following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical scheme in the embodiments of the present invention. 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 to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Referring to fig. 1 to 3, an embodiment of the present invention provides a power supply with multiple inputs, including: the circuit comprises an alternating current conversion circuit 10, a direct current conversion circuit 20, a voltage feedback circuit 30, a first optical coupler 40 and a second optical coupler 50, wherein the alternating current conversion circuit 10 is used for converting input alternating current into first low-voltage direct current; as shown in fig. 1 and 2, a first ac power, which may be 220V ac power, or a second ac power, which may be 110V ac power, may be connected through the power input interface of the ac conversion circuit 10. So as to introduce 220V alternating current or 110 alternating current into the alternating current conversion circuit 10, convert the first alternating current or the second alternating current into voltage by the alternating current conversion circuit 10, thereby converting into the first low-voltage direct current, and output. In an embodiment of the present invention, the first low voltage dc may be 19V low voltage dc, or 5V low voltage dc. Thereby supplying power for notebook computers or electronic equipment such as mobile phones and the like.
The output end of the dc conversion circuit 20 is connected to the output end of the ac conversion circuit 10, and the dc conversion circuit 20 is configured to convert the input dc power into a first low-voltage dc power; as shown in fig. 1 and 3, the input terminal of the dc conversion circuit 20 may be connected to a dc input power source. For example, a 5V dc input power source may be connected, and the input dc input power source may be converted in voltage and then directly output to be the first low voltage dc power, for example, a 19V low voltage dc power, or a 5V low voltage dc power. Thereby supplying power for notebook computers or electronic equipment such as mobile phones and the like.
That is, the ac conversion circuit 10 and the dc conversion circuit 20 can input a plurality of input power sources as power sources, convert the power sources into a set output voltage, and input the voltage to power the electronic device. Therefore, the problem that a notebook or a mobile phone cannot be charged due to the fact that the voltage of the power supply is not adaptive in the process of business trip or travel, particularly cross-country travel, of a user can be solved, and the mobile phone charger is greatly convenient for the user to use.
One end of the voltage feedback circuit 30 is connected with the output end of the first low-voltage direct current; voltage sampling is carried out on the first low-voltage direct current, the input end of a first optical coupler 40 is connected with a voltage feedback circuit 30, and the output end of the first optical coupler 40 is connected with the voltage feedback end of an alternating current conversion circuit 10; the input end of the second optical coupler 50 is connected with the voltage feedback circuit 30, and the output end of the second optical coupler 50 is connected with the voltage feedback end of the direct current conversion circuit 20. The voltage feedback circuit 30 can sample the voltage of the first low-voltage direct current output by the ac conversion circuit 10 or the dc conversion circuit 20, and the first low-voltage direct current is fed back to the voltage feedback end of the ac conversion circuit 10 or the dc conversion circuit 20 through the first optocoupler 40 or the second optocoupler 50, so that the first regulated direct current is subjected to pulse width modulation through the ac conversion circuit 10 or the dc conversion circuit 20, and the voltage stability of the output first regulated direct current is ensured. The same output voltage feedback of the two voltage conversion circuits is realized through the two optical couplers, the whole structure is ingenious, and the production cost is low.
The utility model provides a power supply with multi-path input, which is used for converting input alternating current into first low-voltage direct current through an alternating current conversion circuit 10; the output end of the dc conversion circuit 20 is connected to the output end of the ac conversion circuit 10, and the dc conversion circuit 20 is configured to convert the input dc power into a first low-voltage dc power; one end of the voltage feedback circuit 30 is connected with the output end of the first low-voltage direct current; the input end of the first optical coupler 40 is connected with the voltage feedback circuit 30, and the output end of the first optical coupler 40 is connected with the voltage feedback end of the alternating current conversion circuit 10; the input end of the second optical coupler 50 is connected with the voltage feedback circuit 30, and the output end of the second optical coupler 50 is connected with the voltage feedback end of the direct current conversion circuit 20. Therefore, the input voltage of 220V, 110V or three direct current paths can be used as an input power supply, the output voltage of 19V is used for supplying power for a notebook computer or 5V is used for supplying power for a mobile phone, and the use of a user is facilitated.
Referring to fig. 1 and 2, the ac conversion circuit 10 includes: the system comprises an alternating current-direct current conversion circuit 102, a transformer circuit 103, a switching tube 105, a pulse modulation controller 106 and a first direct current filter circuit, wherein the alternating current-direct current conversion circuit 102 is used for converting input alternating current into high-voltage direct current; as shown in fig. 2, the ac-dc converter circuit 102 may be electrically connected to a 220V or 110V input ac via a CON1 interface to introduce the input ac into the ac-dc converter circuit 102, and the ac-dc converter circuit 102 may convert the input ac into a high-voltage dc by rectifying and filtering the input ac and output the dc to the dc converter circuit 20.
The transformer circuit 103 comprises a transformer, one end of a primary coil of the transformer is connected with a high-voltage direct-current output end of the alternating-current and direct-current conversion circuit 102; the high-voltage direct current output by the ac/dc conversion circuit 102 can be output by voltage transformation after being pulse-modulated by a transformer, so that the output first low-voltage direct current can be transformed to a set voltage value of 5V or 19V. In addition, the transformer has a high isolation effect on the power supply voltage of the primary coil and the secondary coil, and isolation between the output first low-voltage direct current and the alternating current is also ensured, so that the output power supply of the first low-voltage direct current is safer and more reliable.
The drain electrode of the switch tube 105 is connected with the other end of the primary coil of the transformer, and the source electrode of the switch tube 105 is connected with the reference ground; since the switching tube 105 is disposed between the primary winding of the transformer and the reference ground, the high voltage dc current on the primary winding of the transformer can be pulse-modulated by controlling the on/off of the switching tube 105. The switching transistor 105 is a MOS transistor.
The pulse output control end of the pulse modulation controller 106 is connected with the grid electrode of the switching tube 105; the pulse modulation controller 106 outputs a pulse modulation signal, and the pulse modulation signal acts on the control end (gate) of the switching tube 105, so that the switching tube 105 can be controlled to be turned on and off. The pulse modulation controller 106 controls the pulse width of the output pulse modulation signal according to the feedback voltage value, so that the output voltage of the first low-voltage direct current can be regulated or stabilized.
One end of the first direct current filter circuit is connected with a secondary coil of the transformer so as to filter and stabilize the output voltage of the secondary coil into first low-voltage direct current. As shown in fig. 2, the first dc filter circuit includes: the synchronous rectification circuit comprises a synchronous rectification MOS tube Q1, a synchronous rectification controller and a capacitor EC3, wherein the drain electrode of the synchronous rectification MOS tube Q1 is connected with one end of a secondary coil of a transformer, and the source electrode of the synchronous rectification MOS tube Q1 outputs first low-voltage direct current; the synchronous rectification MOS tube is provided with an output end of the secondary coil of the transformer, and is switched on or switched off under the action of the synchronous rectification controller, so that the voltage transformation modulation signal output by the secondary coil of the transformer is rectified and output.
The detection end of the synchronous rectification controller is connected with one end of the secondary coil of the transformer through a resistor R37, and the other end of the synchronous rectification controller is connected with the grid electrode of a synchronous rectification MOS tube Q1. The synchronous rectification controller controls the on-off of the synchronous rectification MOS tube Q1 by detecting the flyback voltage of the secondary coil of the transformer. Compared with a direct diode rectification mode, the switching speed is higher, the consumed power is lower, and the efficiency of the whole circuit is improved.
The positive terminal of the capacitor EC3 is connected to the other end of the secondary winding of the transformer, and the negative terminal of the capacitor EC3 is connected to ground. The capacitor EC3 can stabilize and filter the pulse direct current rectified and output by the synchronous rectification MOS transistor Q1, and then outputs a first low-voltage direct current.
Referring to fig. 1 and 3, the dc conversion circuit 20 includes: the boost converter comprises a boost inductor, a first MOS switch tube Q4, a second MOS switch tube Q3, a boost controller and a second direct current filter output circuit 203, wherein one end of the boost inductor is connected with input direct current; the input direct current can be boosted through the boosting inductor and then output or directly output. For example, when the input power is 5V and the output voltage is 19V, the input 5V voltage may be boosted to a voltage value required for 19V voltage by the boost sensing. And when the output voltage is also 5V, the boost inductor can directly output the 5V voltage.
The drain electrode of the first MOS switch tube Q4 is connected with the other end of the boost inductor, and the source electrode of the first MOS switch tube Q4 is connected with the reference ground; the first MOS transistor Q4 is a boost inductor charging switch transistor 105, and charges the boost inductor when the first MOS transistor is turned on.
The source electrode of the second MOS switching tube Q3 is connected with the other end of the boost inductor; the second MOS switch Q3 is a boost inductor discharge switch Q105, and when the second MOS switch Q3 is turned on, the boost inductor discharges and outputs the external discharge.
Two control ends of the boost controller are respectively connected with the grid electrode of the first MOS switch tube Q4 and the grid electrode of the second MOS switch tube Q3 so as to control the boost of the output voltage of the boost inductor through the first MOS switch tube Q4 and the second MOS switch tube Q3; the turn-on or turn-off time of the first MOS switch tube Q4 or the second MOS switch tube Q3 is controlled by the boost controller. The output power supply can be regulated and controlled. For example, the output is 19V or 5V or other voltage values.
One end of the second dc filter circuit is connected to the drain of the second MOS switch Q3, so as to filter and stabilize the output voltage of the second MOS switch Q3 into the first low-voltage dc. The boost inductor outputs a pulse power supply signal under the action of the boost controller, the first MOS switch tube Q4 and the second MOS switch tube Q3, and the pulse power supply signal can be rectified and filtered into first low-voltage direct current through the second direct current filter circuit and then output as a power supply.
Referring to fig. 1 and 4, the USB power supply circuit 60 is further included, and the USB power supply circuit 60 is connected to the output terminal of the first low-voltage dc power supply to convert the first low-voltage dc power supply into a USB power supply voltage (a second low-voltage dc power supply). In some applications, when the first low-voltage dc power supplies 19V, such application requirements can be satisfied by the USB power circuit 60 in order to simultaneously supply 5V USB electronic devices.
As shown in fig. 4, the USB power supply circuit 60 includes: the USB interface is connected with the DC-DC voltage conversion module, and the input end of the DC-DC voltage conversion module is connected with the output end of the first low-voltage direct current so as to convert the first low-voltage direct current into USB power supply voltage; the DC-DC voltage conversion module can convert the first low-voltage direct current into a power supply voltage for the USB, so that power is supplied to the USB device. The USB identification controller is a single-path USB charging protocol port control IC, can automatically identify the type of the charging equipment, and handshakes with the equipment through a corresponding USB charging protocol to obtain the maximum charging current, so that the charging time is saved on the premise of protecting the charging equipment.
The USB interface is respectively connected with the USB identification controller and the DC-DC voltage conversion module so as to identify the USB equipment and output a USB power supply. The USB interface can be connected with USB equipment to realize the handshake of the USB quick charging protocol and the output of the power supply.
Referring to fig. 1 and 2, the voltage feedback circuit 30 includes: the voltage dividing circuit comprises a resistor R10 and a resistor R22, one end of the resistor R10 is connected with the output end of the first low-voltage direct current, the other end of the resistor R10 is connected with one end of the resistor R22, and the other end of the resistor R22 is connected with a reference ground; the voltage comparison end of the controllable precision voltage stabilizer is connected with the common ends of the resistor R10 and the resistor R22, the anode end of the controllable precision voltage stabilizer is connected with a reference ground, and the cathode end of the controllable precision voltage stabilizer is connected with the output end of the first low-voltage direct current through the resistor R17 and the resistor R9;
the cathode end of the controllable precision voltage stabilizer is connected with one end of a resistor R17, the other end of a resistor R17 is connected with one end of a resistor R9, and the other end of the resistor R9 is connected with the output end of the first low-voltage direct current. As shown in fig. 2, the first low-voltage dc output voltage is divided by the resistor R10 and the resistor R22 and then outputted to the voltage comparison terminal of the controllable precision voltage regulator as a comparison voltage, and the conduction of the controllable precision voltage regulator is achieved by the voltage comparison value in the controllable precision voltage regulator, so that the conduction current is generated in the resistor R17 and the resistor R9.
As shown in fig. 2, two ends of the light emitting diode of the first optical coupler 40 are connected to two ends of the resistor R17, an emitter of the photo triode end of the first optical coupler 40 is connected to a reference ground, and a collector of the photo triode end of the first optical coupler 40 is connected to a voltage feedback end of the pulse modulation controller 106; two ends of a light emitting diode of the second optical coupler 50 are connected with two ends of a resistor R17, an emitter of a photosensitive triode end of the second optical coupler 50 is connected with a reference ground, and a collector of the photosensitive triode end of the first optical coupler 40 is connected with a voltage feedback end of the boost controller. Because the diode light-emitting ends of the first optical coupler 40 and the second optical coupler 50 are respectively arranged at two ends of the resistor R17, after the controllable precision voltage stabilizer is conducted according to the feedback voltage value, the feedback conduction current can be generated, the first optical coupler 40 and the second optical coupler 50 can emit light through the resistor R17, the feedback signal quantity is fed back to the pulse modulation controller 106 of the alternating current conversion circuit 10 or the voltage feedback end of the boost controller of the direct current conversion circuit 20, the output voltage value is adjusted through the pulse modulation controller 106 or the boost controller, and the stability of the output voltage of the first low-voltage direct current is ensured. The optical coupler feedback circuit can accurately feed back the first low-voltage direct current to the feedback ends of the pulse modulation controller 106 of the alternating current conversion circuit 10 and the direct current conversion circuit 20. The feedback circuit is efficient and reliable, and the stability of the first low-voltage direct current is ensured.
Referring to fig. 2, the ac conversion circuit 10 further includes: and a current detection circuit, wherein the source electrode of the switching tube 105 is connected with the reference ground through the current detection circuit, and the source electrode of the switching tube 105 is also connected with the voltage feedback end of the pulse modulation controller 106. As shown in fig. 2, the current detection circuit includes a current sampling resistor RS1, one end of the current sampling resistor RS1 is connected to the source of the switching tube 105, the drain of the current sampling resistor RS1 is connected to the reference ground, and the working current of the primary coil of the transformer can be obtained through the sampling resistor, so as to perform overcurrent protection on the circuit.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (9)
1. A multiple-input power supply, comprising:
an AC conversion circuit for converting an input AC power to a first low voltage DC power;
the output end of the direct current conversion circuit is connected with the output end of the alternating current conversion circuit, and the direct current conversion circuit is used for converting the input direct current into the first low-voltage direct current;
one end of the voltage feedback circuit is connected with the output end of the first low-voltage direct current;
the input end of the first optical coupler is connected with the voltage feedback circuit, and the output end of the first optical coupler is connected with the voltage feedback end of the alternating current conversion circuit;
and the input end of the second optical coupler is connected with the voltage feedback circuit, and the output end of the second optical coupler is connected with the voltage feedback end of the direct current conversion circuit.
2. The multiple-input power supply according to claim 1, wherein the ac conversion circuit comprises:
the alternating current-direct current conversion circuit is used for converting input alternating current into high-voltage direct current;
the transformer circuit comprises a transformer, and one end of a primary coil of the transformer is connected with the high-voltage direct-current output end of the alternating-current and direct-current conversion circuit;
the drain electrode of the switching tube is connected with the other end of the primary coil of the transformer, and the source electrode of the switching tube is connected with the reference ground;
the pulse output control end of the pulse modulation controller is connected with the grid electrode of the switching tube;
and one end of the first direct current filter circuit is connected with the secondary coil of the transformer so as to filter and stabilize the output voltage of the secondary coil into the first low-voltage direct current.
3. The multiple-input power supply according to claim 2, wherein the dc conversion circuit comprises:
the boost inductor is connected with the input direct current at one end;
the drain electrode of the first MOS switch tube is connected with the other end of the boosting inductor, and the source electrode of the first MOS switch tube is connected with a reference ground;
a second MOS switch tube, wherein a source electrode of the second MOS switch tube is connected with the other end of the boosting inductor;
the two control ends of the boost controller are respectively connected with the grid electrode of the first MOS switch tube and the grid electrode of the second MOS switch tube so as to control the boost of the output voltage of the boost inductor through the first MOS switch tube and the second MOS switch tube;
and one end of the second direct current filter circuit is connected with the drain electrode of the second MOS switch tube so as to filter and stabilize the output voltage of the second MOS switch tube into the first low-voltage direct current.
4. The multiple-input power supply according to claim 3, further comprising a USB power supply circuit connected to the output of the first low-voltage DC power supply to convert the first low-voltage DC power supply to a USB supply voltage.
5. The multiple-input power supply according to claim 4, wherein the voltage feedback circuit comprises:
the voltage division circuit comprises a resistor R10 and a resistor R22, one end of the resistor R10 is connected with the output end of the first low-voltage direct current, the other end of the resistor R10 is connected with one end of the resistor R22, and the other end of the resistor R22 is connected with a reference ground;
a voltage comparison end of the controllable precision voltage stabilizer is connected with a common end of the resistor R10 and the resistor R22, an anode end of the controllable precision voltage stabilizer is connected with a reference ground, and a cathode end of the controllable precision voltage stabilizer is connected with an output end of the first low-voltage direct current through a resistor R17 and a resistor R9;
the cathode end of the controllable precision voltage stabilizer is connected with one end of a resistor R17, the other end of the resistor R17 is connected with one end of a resistor R9, and the other end of the resistor R9 is connected with the output end of the first low-voltage direct current.
6. The multi-input power supply according to claim 5, wherein two ends of the light emitting diode of the first optical coupler are connected with two ends of the resistor R17, the emitter of the photo triode end of the first optical coupler is connected with a reference ground, and the collector of the photo triode end of the first optical coupler is connected with the voltage feedback end of the pulse modulation controller;
two ends of a light emitting diode of the second optical coupler are connected with two ends of the resistor R17, an emitter of a photosensitive triode end of the second optical coupler is connected with a reference ground, and a collector of the photosensitive triode end of the first optical coupler is connected with a voltage feedback end of the boost controller.
7. The multiple-input power supply according to claim 4, wherein the USB power supply circuit comprises:
the DC-DC voltage conversion module is connected with an input end and an output end of the first low-voltage direct current so as to convert the first low-voltage direct current into a USB power supply voltage;
a USB identification controller;
and the USB interface is respectively connected with the USB identification controller and the DC-DC voltage conversion module so as to identify the USB equipment and output a USB power supply.
8. The multiple-input power supply according to claim 2, wherein the first dc filter circuit comprises:
a synchronous rectification MOS tube Q1, wherein the drain electrode of the synchronous rectification MOS tube Q1 is connected with one end of the secondary coil of the transformer, and the source electrode of the synchronous rectification MOS tube Q1 outputs the first low-voltage direct current;
a detection end of the synchronous rectification controller is connected with the one end of the secondary coil of the transformer through a resistor R37, and the other end of the synchronous rectification controller is connected with a grid electrode of the synchronous rectification MOS tube Q1;
and the positive end of the capacitor EC3 is connected with the other end of the secondary coil of the transformer, and the negative end of the capacitor EC3 is connected with the ground reference.
9. The multiple-input power supply according to claim 2, wherein the ac conversion circuit further comprises: and the source electrode of the switching tube is connected with the reference ground through the current detection circuit, and is also connected with the voltage feedback end of the pulse modulation controller.
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| CN114204643A (en) * | 2021-12-16 | 2022-03-18 | 深圳市助尔达电子科技有限公司 | Intelligent quick charging source |
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