JP2017221011A - Device, controller and method for power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device, a power supply controller and a power supply method, capable of preventing the occurrence of a timing at which power is not supplied at the changeover of a charge current and voltage.SOLUTION: A power supply device 4 includes: a first system power (reference power 51); a second system power (first power 52 and second power 53); a first output switch S1 which makes the conduction or cutoff of a VBUS route of the first system power; a second output switch S2 which makes the conduction or cutoff of a VBUS route of the second system power; a multiplexer 70 which connects either of the second system power to the VBUS route; and a power supply controller 60 which, while monitoring the VBUS voltage of the VBUS route, controls the first output switch S1, the second output switch S2 and a signal EN of the multiplexer 70, on the basis of the VBUS voltage.SELECTED DRAWING: Figure 8

Description

  The present embodiment relates to a power supply device, a power supply controller, and a power supply method, and more particularly, to a power supply device, a power supply controller, and a power supply method capable of switching between charging current and voltage.

  2. Description of the Related Art Conventionally, DC outlets that can communicate with each other between a terminal device and a power line carrier communication network that support a communication standard involving power supply have been provided (see, for example, Patent Document 1).

  Power supply technology using a data line includes a power over Ethernet (PoE) technology and a universal serial bus (USB) technology.

  USB technology includes USB 2.0 with a maximum of 2.5 W, USB 3.1 with a maximum of 4.5 W, and battery charging standard BC1.2 with a maximum of 7.5 W, depending on the power supply level.

  The USB power delivery specification is an independent standard that is compatible with conventional cables and connectors and coexists with USB 2.0, USB 3.1, and USB battery charging standard BC1.2 (see Non-Patent Document 1, for example). .) In this standard, the charging current and voltage can be selected within the range of 5V to 12V to 20V, current 1.5A to 2A to 3A to 5A, and USB charging up to 10W, 18W, 36W, 65W, and 100W at maximum. Power can be supplied.

  There is a DC / DC converter as a power source for performing such power supply. The DC / DC converter includes a diode rectification method and a synchronous rectification method.

JP 2011-82802 A

Edited by Bob Dunstan, “USB Power Delivery Specification Revision 1.0”, released July 5, 2012, http://www.usb.org/developers/docs/

  However, according to the prior art, there is a timing at which power is not supplied when switching between charging current and voltage.

  The present embodiment provides a power supply device, a power supply controller, and a power supply method that can prevent the occurrence of a timing at which power is not supplied when switching between charging currents and voltages.

  According to one aspect of the present embodiment, the first system power supply, the second system power supply including two or more power supplies, and the first system power supply or the VBUS path of the power supply of the first system An output switch; a second output switch that conducts or blocks a VBUS path of the power supply of the second system; a multiplexer that connects one of the power supplies of the second system to the VBUS path; and a VBUS voltage of the VBUS path And a power supply controller that controls the first output switch, the second output switch, and the signal of the multiplexer based on the VBUS voltage.

  According to another aspect of the present embodiment, the first system power supply, the second system power supply including two or more power supplies, and the VBUS path of the first system power supply are electrically connected or blocked. Output switch, a second output switch for conducting or blocking the VBUS path of the second system power supply, a multiplexer for connecting one of the second system power supplies to the VBUS path, and a VBUS of the VBUS path A power supply controller for use in a power supply apparatus comprising: a power supply controller that controls a signal of the first output switch, the second output switch, and the multiplexer based on the VBUS voltage while monitoring a voltage A monitoring unit that monitors the VBUS voltage of the VBUS path, and the first output based on the VBUS voltage monitored by the monitoring unit. Switch, the second output switch, and the power supply controller and a control unit for controlling the signal of the multiplexer is provided.

  According to another aspect of the present embodiment, the first system power supply, the second system power supply including two or more power supplies, and the VBUS path of the first system power supply are electrically connected or blocked. Output switch, a second output switch for conducting or blocking the VBUS path of the second system power supply, a multiplexer for connecting one of the second system power supplies to the VBUS path, and a VBUS of the VBUS path A power supply device comprising a power supply controller that controls a signal of the first output switch, the second output switch, and the multiplexer based on the VBUS voltage while monitoring a voltage. A monitoring method for monitoring a VBUS voltage of the VBUS path, and a method for supplying the data based on the VBUS voltage monitored in the monitoring step. A first output switch, the second output switch, and a power supply method and a control step of controlling a signal of the multiplexer is provided.

  According to the present embodiment, it is possible to provide a power supply device, a power supply controller, and a power supply method capable of preventing the occurrence of a timing at which power is not supplied when switching between charging currents and voltages.

The typical circuit block block diagram of the electric power supply apparatus which concerns on a basic technique. The typical circuit block block diagram of the electric power supply apparatus which concerns on a comparative example. The timing chart which shows the electric power supply method in the case of switching from a reference power supply to a 1st power supply in the electric power supply apparatus which concerns on a comparative example. The graph which shows the change of the VBUS voltage shown by FIG. Explanatory drawing of the state of the electric power supply apparatus in the time T1 shown by FIG. Explanatory drawing of the state of the electric power supply apparatus in the time T2 shown by FIG. Explanatory drawing of the state of the electric power supply apparatus in the time T3 shown by FIG. The typical circuit block block diagram of the electric power supply apparatus which concerns on 1st Embodiment. The timing chart which shows the electric power supply method in the case of switching from a reference power supply to a 1st power supply in the electric power supply apparatus which concerns on 1st Embodiment. The graph which shows the change of the VBUS voltage shown by FIG. Explanatory drawing of the state of the electric power supply apparatus in the time T1 shown by FIG. Explanatory drawing of the state of the electric power supply apparatus in the time T2 shown by FIG. Explanatory drawing of the state of the electric power supply apparatus in time T4 shown by FIG. Explanatory drawing of the state of the electric power supply apparatus in the time T5 shown by FIG. The typical circuit block block diagram of the MOS switch applied to the electric power supply apparatus which concerns on 1st Embodiment. The typical circuit block block diagram of the electric power supply apparatus which concerns on 2nd Embodiment. The typical circuit block block diagram of the electric power supply apparatus which concerns on 3rd Embodiment. The typical circuit block block diagram of the electric power supply apparatus which concerns on 4th Embodiment. The typical circuit block block diagram of the electric power supply apparatus which concerns on 5th Embodiment.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones. Therefore, specific thicknesses and dimensions should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

  Further, the embodiments described below exemplify apparatuses and methods for embodying the technical idea of the present invention, and the embodiments of the present invention include the material, shape, structure, The layout is not specified as follows. Various modifications can be made to the embodiment of the present invention within the scope of the claims.

[Basic technology]
As shown in FIG. 1, the power supply device 4 according to the basic technology includes a first system power source (reference power source 51), a second system power source (first power source 52, second power source 53), and a first power source. An output switch S1, a second output switch S2, a multiplexer 70, and a power supply controller 60 are provided. Hereinafter, for example, the reference power source 51 may be a 5V power source, the first power source 52 may be a 12V power source, and the second power source 53 may be a 20V power source, for example. As will be described below, power is supplied to the charger 80 by switching the DC voltage of the first system power supply and the second system power supply.

  A first output switch S <b> 1 is provided between the first system power supply (reference power supply 51) and the charger 80 to turn on or off the VBUS power line. The first output switch S1 is, for example, two n-channel MOSFETs (Metal Oxide Semiconductor Field Effect Transistors) Q11 and Q12 connected in series. The gates of the MOSFETs Q11 and Q12 are connected to the power supply controller 60 via signal lines S1G1 and S1G2.

  A second output switch S <b> 2 is provided between the second power supply (first power supply 52 and second power supply 53) and the charger 80 to turn on or off the VBUS power line. The second output switch S2 is, for example, two n-channel MOSFETs Q13 and Q14 connected in series. The gates of the MOSFETs Q13 and Q14 are connected to the power supply controller 60 via signal lines S2G1 and S2G2.

  The multiplexer 70 is connected to the power supply controller 60 via signal lines D0, D1, and D2. Based on the control signals of the signal lines D0, D1, and D2, the switching of the power supply of the second system is determined, and connected to the power line of the VBUS (hereinafter referred to as “VBUS path”). It functions when the signal EN of the multiplexer 70 is in the enable state “H”, and does not function when it is in the disable state “L”.

  The charger 80 is a battery charger or the like that charges power.

  The power supply controller 60 is an IC that realizes USB PD (USB Power Delivery) with a USB-Type-C connector, and enables power supply / reception up to 100 W (20 V / 5 A) between USB-Type-C compatible devices. . Even devices such as notebook PCs and TVs that require large power can be driven by power supply from the USB terminal.

[Comparative example]
(Power supply device)
FIG. 2 is a schematic circuit block diagram of a power supply apparatus 400 according to the comparative example. Although not shown here, the power supply apparatus 400 according to the comparative example also includes a power supply controller that realizes USBPD with a USB-Type-C connector. MOSFETs Q11, Q12, Q13, and Q14 are represented by switch symbols. When the switch is turned off, the voltage corresponding to the forward voltage of the diode is dropped. Therefore, when the switch is in the off state, it is represented by a diode symbol. The point that the multiplexer switches the power supply of the second system is also as described in the basic technique. According to such a power supply device 400, since communication corresponding to the USB-Type-C standard is performed, the signal EN of the multiplexer is disabled “L” at the time of switching the DC voltage, and there is a timing when power is not supplied. To do.

(Power supply method)
FIG. 3 is a timing chart illustrating a power supply method when switching from the reference power supply 51 to the first power supply 52 in the power supply apparatus 400 according to the comparative example. FIG. 4 is a graph showing changes in the VBUS voltage shown in FIG. 5 shows the state of the power supply apparatus 400 at time T1 shown in FIG. 3, FIG. 6 shows the state of the power supply apparatus 400 at time T2 shown in FIG. 3, and FIG. 7 shows the state of FIG. It shows the state of the power supply device 400 at the time T3.

  First, as shown in FIG. 3, at time t0, the power supply controller turns on the control signals of the signal lines S1G1 and S1G2, turns off the control signals of the signal lines S2G1 and S2G2, respectively, EN is disabled to “L”. At this time, as shown in FIG. 5, MOSFET Q11 is turned on, MOSFET Q12 is turned on, MOSFET Q13 is turned off, and MOSFET Q14 is turned off. As a result, the reference power supply 51 is brought into conduction with the charger 80, so that the VBUS voltage becomes 5V (see time T1) as shown in FIG.

  Next, as shown in FIG. 3, the power supply controller switches the control signal of the signal line S1G1 from the on state to the off state at time t1, and turns on the control signal of the signal line S2G2 from the off state at time t2. Switch to state. At this time, as shown in FIG. 6, the MOSFET Q11 is turned off, the MOSFET Q12 is turned on, the MOSFET Q13 is turned off, and the MOSFET Q14 is turned on, but the multiplexer signal EN remains in the disabled state “L”. As a result, as shown in FIG. 4, the VBUS voltage drops from 5 V (see time T2).

  Next, as shown in FIG. 3, the power supply controller switches the control signal of the signal line S1G2 from the on state to the off state at time t3. At this time, as shown in FIG. 7, the MOSFET Q11 is turned off, the MOSFET Q12 is turned off, the MOSFET Q13 is turned off, and the MOSFET Q14 is turned on, but the multiplexer signal EN remains in the disabled state “L”. As a result, as shown in FIG. 4, the VBUS voltage further drops (see time T3).

  At this time, if the power supply controller detects that the VBUS voltage has fallen below a predetermined value (for example, 3.42 V), it performs a hard reset. Specifically, at time t4, the control signal of the signal line S2G1 is switched from the off state to the on state, and the signal EN of the multiplexer is set to the enable state “H”. As a result, the first power supply 52 (or the second power supply 53) switched by the multiplexer is brought into conduction with the charger 80, so that the VBUS voltage after time t4 is up to 12V (or 20V) as shown in FIG. To rise.

  As described above, according to the power supply apparatus 400 according to the comparative example, since communication corresponding to the USB-Type-C standard is performed, the signal EN of the multiplexer is in the “L” state when the DC voltage is switched, and power is supplied. The timing which is not done occurs. Specifically, when the multiplexer signal EN is not in the enable state “H” at the timing shown in FIG. 7, there is a problem that 0 V is applied to the VBUS voltage (see time t4 in FIG. 4).

[First embodiment]
(Power supply device)
As shown in FIG. 8, the power supply device 4 according to the first embodiment includes a first system power supply (reference power supply 51), a second system power supply (first power supply 52, second power supply 53), and Any one of the first output switch S1 that conducts or cuts off the VBUS path of the power supply of the first system, the second output switch S2 that conducts or cuts off the VBUS path of the power supply of the second system, and the power supply of the second system While monitoring the VBUS voltage on the VBUS path, the multiplexer 70 that connects these to the VBUS path controls the signal EN of the first output switch S1, the second output switch S2, and the multiplexer 70 based on the VBUS voltage. And a power supply controller 60.

  Specifically, when switching between the reference power source 51 and the first power source 52 or the second power source 53, the power supply controller 60 and the VBUS path of the reference power source 51 and the VBUS of the first power source 52 or the second power source 53 for a predetermined time. Conduct both paths.

  Further, when switching from the reference power supply 51 to the first power supply 52 or the second power supply 53, the power supply controller 60 may perform control so that the first output switch S1 is not turned off when there is no VBUS voltage.

  Further, when switching from the first power supply 52 or the second power supply 53 to the reference power supply 51, the power supply controller 60 may perform control so that the second output switch S2 is not turned off when there is no VBUS voltage.

  When the power supply controller 60 switches from the first power supply 52 (or the second power supply 53) to the second power supply 53 (or the first power supply 52), the power supply controller 60 switches from the first power supply 52 (or the second power supply) to the reference power supply 51. After switching, the reference power supply 51 may be switched to the second power supply 53 (or the first power supply 52).

  The first output switch S1 includes a first MOSFET Q11 and a second MOSFET Q12 connected in series downstream thereof, and the second output switch S2 includes a third MOSFET Q13 and a second MOSFET connected in series downstream thereof. 4MOSFETQ14 may be included.

  The power supply controller 60 sets the signal EN of the multiplexer 70 to the enable state “H” at the timing when the first MOSFET Q11 is in the off state, the second MOSFET Q12 is in the on state, the third MOSFET Q13 is in the off state, and the fourth MOSFET Q14 is in the on state. Good.

  The power supply controller 60 also includes charge pumps CP1 and CP2 that boost the voltage. As a feedback line for the charge pumps CP1 and CP2, a feedback line S1_SRC connected between the first MOSFET Q11 and the second MOSFET Q12, and a third MOSFET Q13. And a feedback line S2_SRC connected between the first MOSFET Q14 and the fourth MOSFET Q14.

  Further, the power supply controller 60 may be compatible with the USB-Type-C standard and the USB PD standard.

  The power supply controller 60 also includes a monitoring unit 61 that monitors the VBUS voltage of the VBUS path, a first output switch S1, a second output switch S2, and a multiplexer based on the VBUS voltage monitored by the monitoring unit 61 And a control unit 62 for controlling 70 signals EN.

(Power supply method)
FIG. 9 is a timing chart showing a power supply method when switching from the reference power supply 51 to the first power supply 52 in the power supply apparatus 4 according to the first embodiment. FIG. 10 is a graph showing changes in the VBUS voltage shown in FIG. 11 shows the state of the power supply device 4 at time T1 shown in FIG. 9, FIG. 12 shows the state of the power supply device 4 at time T2 shown in FIG. 9, and FIG. 13 shows the state of FIG. 14 shows the state of the power supply device 4 at time T4, and FIG. 14 shows the state of the power supply device 4 at time T5 shown in FIG.

  First, as shown in FIG. 9, at time t0, the power supply controller 60 turns on the control signals of the signal lines S1G1 and S1G2 and turns off the control signals of the signal lines S2G1 and S2G2, respectively. The signal EN is set to the disable state “L”. At this time, as shown in FIG. 11, the first MOSFET Q11 is turned on, the second MOSFET Q12 is turned on, the third MOSFET Q13 is turned off, and the fourth MOSFET Q14 is turned off. As a result, the reference power supply 51 is brought into conduction with the charger 80, so that the VBUS voltage becomes 5V (see time T1) as shown in FIG.

  Next, as shown in FIG. 9, the power supply controller 60 switches the control signal of the signal line S1G1 from the on state to the off state at time t1, and at time t2, the power supply controller 60 switches the control signal of the signal line S2G2 from the off state. Switch on. At this time, as shown in FIG. 12, the first MOSFET Q11 is turned off, the second MOSFET Q12 is turned on, the third MOSFET Q13 is turned off, and the fourth MOSFET Q14 is turned on, but the signal EN of the multiplexer 70 is in the disabled state “L”. It remains. As a result, as shown in FIG. 10, the VBUS voltage drops from 5 V (see time T2).

  Here, as shown in FIG. 9, when the VBUS voltage becomes 5V-Vf (time t3), the power supply controller 60 switches the signal of the multiplexer 70 to the enable state “H”. Vf is the voltage of the diode drop. At this time, as shown in FIG. 13, the first MOSFET Q11 is off, the second MOSFET Q12 is on, the third MOSFET Q13 is off, and the fourth MOSFET Q14 is on. As a result, both the reference power supply 51 and the first power supply 52 (or the second power supply 53) are brought into conduction with the charger 80, so that the VBUS voltage rises as shown in FIG. 10 (see time T4).

  Next, as illustrated in FIG. 9, when the VBUS voltage becomes 12 V (or 20 V) −Vf (time t4), the power supply controller 60 switches the control signal of the signal line S1G2 from the on state to the off state. At this time, as shown in FIG. 14, the first MOSFET Q11 is turned off, the second MOSFET Q12 is turned off, the third MOSFET Q13 is turned off, and the fourth MOSFET Q14 is turned on. Thereby, as shown in FIG. 10, the VBUS voltage becomes constant at 12 V (or 20 V) −Vf (see time T5).

  Finally, as shown in FIG. 9, the power supply controller 60 switches the control signal of the signal line S2G1 from the off state to the on state at time t5. At this time, the first MOSFET Q11 is turned off, the second MOSFET Q12 is turned off, the third MOSFET Q13 is turned on, and the fourth MOSFET Q14 is turned on. Thereby, as shown in FIG. 10, the VBUS voltage after time t5 rises to 12V (or 20V).

  As described above, in the power supply device 4 according to the first embodiment, while monitoring the VBUS voltage, the output switch (first output switch S1) of the reference power supply 51 is not turned off when there is no VBUS voltage. ing. That is, for the moment (time T4), the VBUS path of the first power supply 52 (or the second power supply 53) is also turned on while the VBUS path of the reference power supply 51 is turned on. In this way, it is possible to prevent the occurrence of a timing at which power is not supplied at the time of switching between the charging current and voltage, and therefore it is possible to switch the voltage without applying a hard reset. As a result, it is possible to prevent a drop in the VBUS voltage and prevent the cold plug from being detected.

  Here, the case of switching from the reference power supply 51 to the first power supply 52 is illustrated, but the other switching operations are the same. For example, when switching from the first power source 52 to the second power source 53, the first power source 52 may be switched to the reference power source 51 in the same procedure as described above, and then the reference power source 51 may be switched to the second power source 53. If the VBUS voltage does not fall below 3.42V, it is possible to switch the voltages to each other without causing an abnormal state.

  In addition, here, as the first output switch S1 (second output switch S2), two MOSFETs Q11 and Q12 (Q13, Q14) connected in series are illustrated, but the structure of the switch is limited to this. It is not a thing. Of course, according to the structure in which the two MOSFETs Q11 and Q12 are connected in series as described above, the VBUS path can be more reliably cut off, which is particularly useful when safety is important.

(MOS switch)
A schematic circuit block configuration example of the first output switch S1 and the second output switch S2 applicable to the power supply device 4 according to the first embodiment is shown in FIG. MOSFETs Q11 and Q12 (Q13 and Q14) are provided. The gates of the two MOSFETs Q11 and Q12 (Q13, Q14) connected in series are connected to the secondary-side controller 16 and are turned on / off by the secondary-side controller 16.

The secondary controller 16 includes a communication unit 42, a logic circuit 44, a driver 46, a comparison circuit 48, and the like. The communication unit 42 includes a communication pin COM, which are connected via the AC coupling capacitor C _C to the output (VBUS). The switch SW3 is connected to the filter circuit (LF · CF) via the discharge terminal DIS and the resistor R11. By turning on the switch SW3, the charges accumulated in the VBUS line and the capacitor CF can be discharged. The VBUS voltage and the reference voltage _VTH are compared by the comparison circuit 48, and the comparison result is input to the logic circuit 44. The logic circuit 44 controls a driver 46, an error amplifier (EA), and the like based on signals from the comparison circuit 48, the communication unit 42, and the like. The driver 46 drives the MOSFETs Q11, Q12, Q13, and Q14 through the output terminals OUT1, OUT2, OUT3, and OUT4, and switches the switches to the first power supply 52 and the second power supply 53 through the enable terminal EN. It is possible.

  The secondary-side controller 16 may include a functional unit similar to that of the power supply controller 60, and may prevent the occurrence of a timing at which power is not supplied when switching between charging current and voltage.

The secondary side controller 16 are connected via the AC coupling capacitor C _C to the output (VBUS).

  In the power supply apparatus according to the first embodiment, an AC signal is superimposed on the power line output (VBUS) and input from the outside.

In the power supply apparatus according to the first embodiment, a control input signal is input from the power line output (VBUS) to the secondary-side controller 16 via the AC coupling capacitor _CC, and the power information on the output side is an error amplifier. Feedback is provided to the primary side via the EA.

In the power supply device according to the first embodiment, it is also possible to use a control input signal inputted from the power line output (VBUS) via the AC coupling capacitor C _C in USB-PD communication. For this reason, according to the load (for example, smart phone, laptop PC, tablet PC etc.) connected to an output, it has a variable function in the relationship between an output voltage and an output current. The same applies to the second to fifth embodiments described below.

[Second Embodiment]
As shown in FIG. 16, the power supply device 4A according to the second embodiment is arranged between the input and the output, and a ground potential is applied to the primary side inductance L1 of the transformer 15, the diode D1, the capacitor C1, and the transformer 15. A DC / DC converter 13 comprising a MOSFET Q1 and a resistor RS connected in series, a primary controller 30 for controlling the MOSFET Q1, and a primary controller 30 connected between the input and the primary controller 30. A power supply circuit 10 for supplying power to the output, a secondary controller 16 connected to the output and capable of controlling the output voltage V _o and the output current I _o , the output of the DC / DC converter 13 and the secondary controller 16 The connected error amplifier 21 for error compensation and the error amplifier 21 are connected to each other, and output information is sent to the primary controller 30. And an insulating circuit 20 for feeding back to

Similarly to FIG. 15, the secondary controller 16 may be connected to the output (VBUS) via an AC coupling capacitor C _C (not shown).

  Further, as shown in FIG. 16, the power supply device 4A according to the second embodiment includes a switch SW that cuts off the output of the DC / DC converter 13 and the power line output (VBUS), and the switch SW and the power line output (VBUS). ) And a filter circuit (LF · CF) disposed therebetween. This switch SW can be turned on / off by the secondary controller 16. Here, in the power supply device 4A according to the second embodiment, the configuration of the switch SW is a switch circuit configuration including MOSFETs Q11, Q12, Q13, and Q14 in the power supply device 4 according to the first embodiment. Applicable. That is, in the power supply device 4A according to the second embodiment, the same configuration as the switch circuit configuration including the MOSFETs Q11, Q12, Q13, and Q14 is simplified by the switch SW.

  In the power supply device 4A according to the second embodiment, an AC signal is superimposed on the power line output (VBUS) and input from the outside.

In the power supply apparatus 4A according to the second embodiment, the control input signal from the power line output (VBUS) via the AC coupling capacitor C _C (not shown) is inputted to the secondary-side controller 16, the output-side power Information is fed back to the primary controller 30 via the error amplifier 18 and the insulation circuit 20. The primary-side controller 30 can control the ON / OFF of the MOSFET Q1 and can stabilize the output voltage.

In the power supply apparatus 4A according to the second embodiment, similarly to the control input signal input from the output (VBUS) via the AC coupling capacitor C _C first embodiment (FIG. 15) It can also be used for USB-PD communication.

  In the power supply device 4A according to the second embodiment, the amount of current conducted to the primary side inductance L1 is detected by the current sensing resistor RS, and the primary side controller 30 detects the primary side excess current. The amount of current such as current is controlled. As a result, the power supply device 4A according to the second embodiment has an output voltage value and output current value MAX variable function.

In the power supply device 4A according to the second embodiment, the output voltage value and the output possible current capacity (MAX) of the step-down DC / DC converter 13 are controlled by feedback control from the secondary controller 16 to the primary controller 30. Value) Variable function. Therefore, the load connected to the output (e.g., smart phones, laptop PC, tablet PC, etc.) in accordance with, a variable function of the relationship between the output voltage V _o and the output current I _o.

[Third embodiment]
As shown in FIG. 17, the power supply device 4 according to the third embodiment controls a DC / DC converter 13 disposed between an input and an output, and an input current of the DC / DC converter 13. The secondary controller 30 includes a secondary controller 16 coupled to the control input and receiving a control input signal of the control input and feeding back to the primary controller 30. Here, the control input signal of the control input is input to the communication pin COM of the secondary controller 16. Further, the primary side controller 30 controls the input current based on the control input signal fed back from the secondary side controller 16, so that the output voltage value and the output possible current capacity (MAX value) of the DC / DC converter 13 are controlled. ) Is variable. An output capacitor C _O is connected between the power line output (VBUS) and the ground potential.

  Further, as shown in FIG. 17, a control terminal CT may be provided, and a control input may be coupled to the control terminal CT. Moreover, the control output signal of the power supply device 4 according to the third embodiment can be output to the external device via the control terminal CT.

Further, the power supply device 4 according to the third embodiment includes an AC coupling capacitor C _C (not shown) coupled to the control input, and the secondary controller 16 has a control terminal via the AC coupling capacitor C _C. It may be connected to CT.

Further, the control terminal CT may be directly connected to the secondary controller 16. That is, the secondary-side controller 16 without the control input signal of the control input through the AC coupling capacitor C _C, it may be entered directly.

  In addition, the power supply device 4 according to the third embodiment includes an insulating circuit 20 that is connected to the secondary controller 16 and feeds back a control input signal to the primary controller 30 as shown in FIG. May be. A capacitor, a photocoupler, a transformer, or the like can be applied to the insulating circuit 20. Further, a bidirectional transformer with an insulating driver, a bidirectional element, or the like may be applied depending on the application.

  Further, as shown in FIG. 17, the power supply device 4 according to the third exemplary embodiment includes an error amplifier 21 for error compensation that is connected to the secondary controller 16 and feeds back a control input signal to the insulating circuit 20. You may have. The error amplifier 21 is controlled by the secondary side controller 16 and can perform error compensation of a control input signal fed back to the isolation circuit 20.

  The power supply device 4 according to the third embodiment includes a switch SW that is connected to the output of the DC / DC converter 13 and cuts off the output voltage of the DC / DC converter 13 as shown in FIG. May be. The switch SW can cut off the output of the DC / DC converter 13 and the power line output (VBUS). This switch SW can be turned on / off by the secondary controller 16. Here, in the power supply device 4 according to the third embodiment, the configuration of the switch SW is a switch circuit configuration including MOSFETs Q11, Q12, Q13, and Q14 in the power supply device 4 according to the first embodiment. Applicable. That is, in the power supply device 4 according to the third embodiment, the same configuration as the switch circuit configuration including the MOSFETs Q11, Q12, Q13, and Q14 is represented by a switch SW.

  Further, as shown in FIG. 17, the power supply device 4 according to the third embodiment is connected between the input of the DC / DC converter 13 and the primary side controller 30, and is connected to the primary side controller 30. A power supply circuit 10 for supplying power may be provided.

  In the power supply device 4 according to the third embodiment, unlike the second embodiment in which an AC signal is superimposed on the power line output (VBUS) and input from the outside, separately from the power line output (VBUS). Provide control input. For this reason, the separation inductance LF is not always necessary. That is, it is not necessary to separate the input of the control input signal from the output to the DC / DC converter 13 by the filter circuit including the inductance LF and the capacitor CF. For this reason, in the power supply device 4 according to the third embodiment, the mounting space can be relatively reduced, and the size and cost can be reduced.

In the power supply device 4 according to the third embodiment, the control input signal from the control input through the AC coupling capacitor C _C is inputted to the secondary-side controller 16, by the control input signal, the power information on the output side Is fed back to the primary controller 30 via the error amplifier 18 and the insulation circuit 20. The primary side controller 30 controls ON / OFF of the MOSFET Q1 to stabilize the output voltage.

In the power supply device 4 according to the third embodiment, the USB-PD communication as in the second embodiment of the control input signal inputted via the AC coupling capacitor C _C from the control terminal CT It is also possible to use it.

In the power supply device 4 according to the third embodiment, the output voltage value and the output possible current capacity (MAX) of the step-down DC / DC converter 13 are controlled by feedback control from the secondary controller 16 to the primary controller 30. Value) Variable function. Therefore, the load connected to the output (e.g., smart phones, laptop PC, tablet PC, etc.) in accordance with, a variable function of the relationship between the output voltage V _o and the output current I _o.

[Fourth embodiment]
As shown in FIG. 18, the power supply device 4A according to the fourth embodiment is arranged between the input and the output, and the ground potential is applied to the primary side inductance L1 of the transformer 15, the diode D1, the capacitor C1, and the transformer 15. Are connected between a DC / DC converter 13 composed of a MOS transistor Q1 and a resistor RS connected in series, a primary controller 30 for controlling the MOS transistor Q1, and an input and the primary controller 30. A power supply circuit 10 that supplies power to the secondary controller 30, a secondary controller 16 that is connected to the output and can control the output voltage V _o and the output current I _o , the output of the DC / DC converter 13, and the secondary The error amplifier 21 for error compensation connected to the side controller 16 and the error amplifier 21 are connected to the primary side controller. And an insulating circuit 20 that feeds back to the trawler 30.

Similarly to FIG. 15, the secondary controller 16 may be connected to the output (VBUS) via an AC coupling capacitor C _C (not shown).

  As shown in FIG. 18, the power supply device 4A according to the fourth embodiment includes a switch SW that cuts off the output of the DC / DC converter 13 and the power line output (VBUS), and the switch SW and the power line output (VBUS). ) And a filter circuit (LF · CF) disposed therebetween. This switch SW can be turned on / off by the secondary controller 16. Here, in the power supply device 4A according to the fourth embodiment, the configuration of the switch SW is a switch circuit configuration including MOSFETs Q11, Q12, Q13, and Q14 in the power supply device 4 according to the first embodiment. Applicable. That is, in the power supply device 4A according to the fourth embodiment, a configuration similar to the switch circuit configuration including the MOSFETs Q11, Q12, Q13, and Q14 is simplified and represented by the switch SW.

  In the power supply device 4A according to the fourth embodiment, an AC signal is superimposed on the power line output (VBUS) and input from the outside.

In the power supply device 4A according to the fourth embodiment, the control input signal is input to the secondary controller 16 from the power line output (VBUS) via the AC coupling capacitor C _C (not shown), and the output side power is output. Information is fed back to the primary controller 30 via the error amplifier 18 and the insulation circuit 20. The primary-side controller 30 can control the ON / OFF of the MOS transistor Q1, and can stabilize the output voltage.

Further, in the power supply device 4A according to the fourth embodiment, the control input signal input from the control input via the AC coupling capacitor C _C (not shown) is sent to the USB− as in the third embodiment. It can also be used for PD communication.

  Further, in the power supply device 4A according to the fourth embodiment, the amount of current conducted to the primary side inductance L1 is detected by the current sensing resistor RS, and the primary side controller 30 detects the primary side excess. The amount of current such as current is controlled. As a result, the power supply device 4A according to the fourth embodiment has an output voltage value and output current value MAX variable function.

In the power supply device 4A according to the fourth embodiment, the output voltage value and the output possible current capacity (MAX) of the step-down DC / DC converter 13 are controlled by feedback control from the secondary controller 16 to the primary controller 30. Value) Variable function. Therefore, the load connected to the output (e.g., smart phones, laptop PC, tablet PC, etc.) in accordance with, a variable function of the relationship between the output voltage V _o and the output current I _o.

[Fifth embodiment]
As shown in FIG. 19, the power supply device 4 according to the fifth embodiment controls a DC / DC converter 13 disposed between an input and an output, and an input current of the DC / DC converter 13. The secondary controller 30, the signal conversion circuit 25 coupled to the plurality of control inputs and switching the control input signals of the plurality of control inputs, and the control input signal coupled to the signal conversion circuit 25 and switched in the signal conversion circuit 25 And a secondary controller 16 that receives and feeds back to the primary controller 30.

The control input signal switched in the signal conversion circuit 25 is input to the communication pin COM of the secondary controller 16. Further, the primary side controller 30 controls the input current of the DC / DC converter 13 based on the control input signal fed back from the secondary side controller 16, whereby the output voltage value and output of the DC / DC converter 13 are controlled. The possible current capacity (MAX value) is made variable. An output capacitor C _O is connected between the power line output (VBUS) and the ground potential.

  Further, as shown in FIG. 19, a plurality of control terminals CT1, CT2,..., CTn may be provided, and a plurality of control inputs may be coupled to the plurality of control terminals CT1, CT2,. Further, the control output signal of the power supply device 4 according to the fifth embodiment can be output to an external device via the plurality of control terminals CT1, CT2,.

In the power supply device 4 according to the fifth embodiment, AC coupling capacitors C _t1 , C _t2 ,... C connected between the plurality of control terminals CT1, CT2,. _The signal conversion circuit 25 may be coupled to a plurality of control inputs via AC coupling capacitors C _t1 , C _t2 ,..., C _tn that include _tn (not shown) and are coupled to the plurality of control inputs.

The plurality of control inputs may be directly connected to the signal conversion circuit 25. That is, a plurality of control input control input signals may be directly input to the signal conversion circuit 25 without passing through the AC coupling capacitors C _t1 , C _{t2 ,.}

The power supply device 4 according to the fifth embodiment may include a coupling capacitor C _C that couples the secondary-side controller 16 and the signal conversion circuit 25. Further, while the secondary-side controller 16, the signal conversion circuit 25, not through the coupling capacitor C _C, may be directly connected.

  In the power supply device 4 according to the fifth embodiment, the signal conversion circuit 25 can execute, for example, any one of frequency conversion, DC level conversion, and amplitude level conversion.

  In the power supply device 4 according to the fifth embodiment, the signal conversion circuit 25 may be controlled by the secondary controller 16.

  Further, as shown in FIG. 19, the power supply device 4 according to the fifth embodiment includes an insulating circuit 20 that is connected to the secondary controller 16 and feeds back a control input signal to the primary controller 30. May be. A capacitor, a photocoupler, a transformer, or the like can be applied to the insulating circuit 20. Further, a bidirectional transformer with an insulating driver, a bidirectional element, or the like may be applied depending on the application.

  Further, as shown in FIG. 19, the power supply device 4 according to the fifth embodiment includes an error compensation error amplifier 21 that is connected to the secondary-side controller 16 and feeds back a control input signal to the insulation circuit 20. You may have. The error amplifier 21 is controlled by the secondary side controller 16 and can perform error compensation of a control input signal fed back to the isolation circuit 20.

  Further, as shown in FIG. 19, the power supply device 4 according to the fifth embodiment includes a switch SW that is connected to the output of the DC / DC converter 13 and cuts off the output voltage of the DC / DC converter 13. May be. The switch SW can cut off the output of the DC / DC converter 13 and the power line output (VBUS). This switch SW can be turned on / off by the secondary controller 16. Here, in the power supply device 4 according to the fifth embodiment, the configuration of the switch SW is a switch circuit configuration including MOSFETs Q11, Q12, Q13, and Q14 in the power supply device 4 according to the first embodiment. Applicable. That is, in the power supply apparatus 4 according to the fifth embodiment, the same configuration as the switch circuit configuration including the MOSFETs Q11, Q12, Q13, and Q14 is represented by a switch SW.

  Further, the power supply device 4 according to the fifth embodiment is connected between the input of the DC / DC converter 13 and the primary controller 30 as shown in FIG. A power supply circuit 10 for supplying power may be provided.

  In the power supply device 4 according to the fifth embodiment, unlike the fourth embodiment in which an AC signal is superimposed on the power line output (VBUS) and input from the outside, separately from the power line output (VBUS). With multiple control inputs. For this reason, the separation inductance LF is not always necessary. That is, it is not necessary to separate the input of the control input signal from the output to the DC / DC converter 13 by the filter circuit including the inductance LF and the capacitor CF. For this reason, in the power supply device 4 according to the fifth embodiment, the mounting space can be relatively reduced, and the size and cost can be reduced.

In the power supply device 4 according to the fifth embodiment, the control input signal is inputted via the AC coupling capacitor _{C t1 · C t2 · ... ·} C tn from a plurality of control inputs, further switching in the signal conversion circuit 25 The control input signal is input to the secondary-side controller 16, and control information including power information on the output side is fed back to the primary-side controller 30 through the error amplifier 18 and the insulating circuit 20 by this control input signal. Is done. The primary controller 30 controls ON / OFF of the MOS transistor Q1 and stabilizes the output voltage.

In the power supply apparatus according to the fifth embodiment, control input signals input from a plurality of control inputs via AC coupling capacitors C _t1 , C _{t2 ,.} It is also possible to use it for USB-PD communication in the same way.

In the power supply device 4 according to the fifth embodiment, the output voltage value and the output possible current capacity (MAX) of the step-down DC / DC converter 13 are controlled by feedback control from the secondary controller 16 to the primary controller 30. Value) Variable function. Therefore, the load connected to the output (e.g., smart phones, laptop PC, tablet PC, etc.) in accordance with, a variable function of the relationship between the output voltage V _o and the output current I _o.

  As described above, according to the present embodiment, a power supply device, a power supply controller, and a power supply method that can prevent the occurrence of a timing when power is not supplied when switching between charging current and voltage are provided. Can be provided.

[Other embodiments]
As described above, the embodiments have been described. However, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  As described above, the present invention naturally includes various embodiments not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

  The power supply apparatus according to this embodiment can be applied to a DC-DC power supply, a USB-Type-C / PD DC-DC power supply, and a USB-Type-C DC-DC power supply. In addition, the present invention can be applied to electronic devices in various fields such as automobiles, aircraft, ships, railways, rockets, medical equipment, industrial machines, and robots.

4, 4A ... Power supply device 51 ... Reference power supply (first system power supply)
52 ... 1st power supply (2nd system power supply)
53. Second power source (second system power source)
60 ... Power supply controller 61 ... Monitoring unit 62 ... Control unit 70 ... Multiplexer 80 ... Chargers CP1, CP2 ... Charge pumps D0, D1, D2 ... Signal lines Q11, Q12, Q13, Q14 ... MOSFETs
S1 ... 1st output switch S2 ... 2nd output switch S1_SRC, S2_SRC ... Feedback line S1G1, S1G2, S2G1, S2G2 ... Signal line

Claims (21)

A first power source;
A second power source including two or more power sources;
A first output switch for conducting or blocking the VBUS path of the first system power supply;
A second output switch for conducting or blocking the VBUS path of the power supply of the second system;
A multiplexer connecting any one of the power supplies of the second system to the VBUS path;
A power supply controller that controls a signal of the first output switch, the second output switch, and the multiplexer based on the VBUS voltage while monitoring a VBUS voltage of the VBUS path. Power supply device.   When switching the power supply of the first system and the power supply of the second system, the power supply controller conducts both the VBUS path of the power supply of the first system and the VBUS path of the power supply of the second system for a predetermined time. The power supply device according to claim 1, wherein:   The power supply controller controls the first output switch not to be turned off when there is no VBUS voltage when switching from the first power source to the second power source. The power supply apparatus according to claim 2.   The power supply controller controls the second output switch not to be turned off when there is no VBUS voltage when switching from any one of the second system power sources to the first system power source. The power supply apparatus according to claim 2.   When switching from a specific power source included in the second system power source to another specific power source, the power supply controller switches from the specific power source to the first system power source, and then switches to the first system power source. The power supply apparatus according to claim 2, wherein the power supply is switched to the other specific power source. The first output switch includes a first field effect transistor and a second field effect transistor connected in series downstream thereof,
The power supply apparatus according to claim 1, wherein the second output switch includes a third field effect transistor and a fourth field effect transistor connected in series on the downstream side thereof.   The power supply controller is configured such that the first field effect transistor is in an off state, the second field effect transistor is in an on state, the third field effect transistor is in an off state, and the fourth field effect transistor is in an on state. The power supply device according to claim 6, wherein a signal of the multiplexer is enabled. The power supply controller includes a charge pump that boosts a voltage,
As a feedback line for the charge pump, a feedback line connected between the first field effect transistor and the second field effect transistor, and between the third field effect transistor and the fourth field effect transistor. The power supply device according to claim 6, further comprising a connected feedback line.   The power supply apparatus according to any one of claims 1 to 8, wherein the power supply controller is compatible with a USB-Type-C standard and a USBPD standard. A first system power source, a second system power source including two or more power sources, a first output switch for conducting or blocking a VBUS path of the first system power source, and a second system power source Based on the VBUS voltage while monitoring the VBUS voltage of the VBUS path, a second output switch for conducting or blocking the VBUS path, a multiplexer for connecting one of the power supplies of the second system to the VBUS path, A power supply controller for use in a power supply apparatus comprising: the first output switch; the second output switch; and a power supply controller that controls a signal of the multiplexer,
A monitoring unit for monitoring the VBUS voltage of the VBUS path;
A power supply controller comprising: a control unit that controls a signal of the first output switch, the second output switch, and the multiplexer based on a VBUS voltage monitored by the monitoring unit.   When switching between the power supply of the first system and the power supply of the second system, the control unit makes both the VBUS path of the power supply of the first system and the VBUS path of the power supply of the second system conductive for a predetermined time. The power supply controller according to claim 10.   The control unit controls the first output switch not to be turned off when the VBUS voltage is not present when switching from the first power source to the second power source. Item 12. The power supply controller according to Item 11.   The control unit controls the second output switch not to be turned off when there is no VBUS voltage when switching from one of the power supplies of the second system to the power supply of the first system. Item 12. The power supply controller according to Item 11.   When switching from a specific power source included in the second system power source to another specific power source, the control unit switches from the specific power source to the first system power source, and then from the first system power source. The power supply controller according to claim 11, wherein the power supply controller is switched to the other specific power source.   The power supply controller according to claim 10, wherein the power supply controller is compatible with the USB-Type-C standard and the USBPD standard. A first system power source, a second system power source including two or more power sources, a first output switch for conducting or blocking a VBUS path of the first system power source, and a second system power source Based on the VBUS voltage while monitoring the VBUS voltage of the VBUS path, a second output switch for conducting or blocking the VBUS path, a multiplexer for connecting one of the power supplies of the second system to the VBUS path, A power supply method comprising: a power supply device comprising: a power supply controller that controls a signal of the first output switch, the second output switch, and the multiplexer;
A monitoring step of monitoring the VBUS voltage of the VBUS path;
And a control step of controlling signals of the first output switch, the second output switch, and the multiplexer based on the VBUS voltage monitored in the monitoring step.   In the control step, when switching between the power supply of the first system and the power supply of the second system, both the VBUS path of the power supply of the first system and the VBUS path of the power supply of the second system are made conductive for a predetermined time. The power supply method according to claim 16.   In the control step, when switching from the first power source to the second power source, the first output switch is controlled not to be turned off when the VBUS voltage is absent. Item 18. The power supply method according to Item 17.   In the control step, when switching from one of the power supplies of the second system to the power supply of the first system, control is performed so that the second output switch is not turned off when there is no VBUS voltage. Item 18. The power supply method according to Item 17.   In the control step, when switching from a specific power source included in the power source of the second system to another specific power source, after switching from the specific power source to the power source of the first system, the power source of the first system The power supply method according to claim 17, wherein the power supply is switched to the other specific power source.   The power supply method according to any one of claims 16 to 20, wherein the power supply controller is compatible with a USB-Type-C standard and a USBPD standard.

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