CN110661425B - Power supply circuit and protocol control circuit therein - Google Patents
Power supply circuit and protocol control circuit therein Download PDFInfo
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- CN110661425B CN110661425B CN201910211640.XA CN201910211640A CN110661425B CN 110661425 B CN110661425 B CN 110661425B CN 201910211640 A CN201910211640 A CN 201910211640A CN 110661425 B CN110661425 B CN 110661425B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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Abstract
A power supply circuit and a protocol control circuit therein. The power supply circuit includes: the power conversion circuit, the path switch and the protocol control circuit, the protocol control circuit controls the power conversion circuit and the path switch. The protocol control circuit includes: the shared pin is coupled to the confluence node through the temperature-sensitive element and is used for correspondingly transmitting signals with different functions in at least two different modes; and a signal detection circuit for sensing a voltage at the bus node through the shared pin in a power supply start mode to determine whether to control the path switch to turn on the power supply path to enter a power supply mode; and the temperature sensor is used for receiving a temperature signal generated by the temperature sensitive element through the shared pin in a power supply mode so as to measure the environment temperature of the temperature sensitive element.
Description
Technical Field
The present invention relates to a power supply circuit, and more particularly, to a power supply circuit with protocol control function. The invention also relates to a protocol control circuit used in the power supply circuit.
Background
Fig. 1 shows a prior art power supply circuit (power supply circuit 1), in which a protocol control circuit 350 is used to control a power conversion circuit 110 and a path switch QP, the power conversion circuit 110 is used to convert an input power VIN and generate an output power at an output node NOUT; the path switch QP is coupled between the output node NOUT and the bus node NB for controlling a power path between the output node NOUT and the bus node NB. In the prior art, the protocol control circuit 350 is an integrated circuit, which includes 10 pins: feedback control pin 351, current sense pin 352, ground pin 353, power pin 354, null pin 305, temperature sense pin 356, bus sense pin 357, switch control pin 358, first configuration channel pin 359, and second configuration channel pin 360. The protocol control circuit 350 receives and transmits the configuration of the output power of the power conversion circuit 110 through the first configuration channel pin 359 and the second configuration channel pin 360, and generates the output power at the output node NOUT according to the configuration of the output power. The protocol control circuit 350 senses the voltage at the bus node NB through the bus sensing pin 357 to determine whether to control the path switch QP to turn on the power path to enter a power mode in the power-on mode. In addition, the protocol control circuit 350 also receives a temperature signal generated by the temperature sensitive resistor RT through the temperature sensing pin 356 in the power supply mode, wherein the temperature signal is in response to an ambient temperature of the temperature sensitive resistor RT.
The prior art shown in fig. 1 has the disadvantage of using pins with independent functions, so the total pin count of the protocol control circuit 350 is large, resulting in high cost and large circuit size.
Compared with the prior art shown in fig. 1, the present invention uses the same shared pin to correspondingly transmit signals with different functions in at least two different modes, thereby reducing the total pin count and circuit size of the protocol control circuit 350 and further reducing the cost.
Disclosure of Invention
From one aspect, the present invention provides a power supply circuit, comprising: a power conversion circuit for converting an input power to generate an output power at an output node; a path switch coupled between the output node and a bus node for controlling a power path between the output node and the bus node; a temperature sensitive element coupled to the bus node; and a protocol control circuit for controlling the power conversion circuit and the path switch; the protocol control circuit includes: a shared pin coupled to the bus node through the temperature sensitive element, the shared pin being configured to correspondingly transmit signals of different functions in at least two different modes; and a signal detection circuit, for sensing the voltage on the bus node through the shared pin in a power-on mode to determine whether to control the path switch to turn on the power path to enter a power-on mode, wherein in the power-on mode, the path switch is turned off; and is used for receiving a temperature signal generated by the temperature sensitive element through the shared pin in the power supply mode so as to measure an environment temperature of the temperature sensitive element.
In one embodiment, the protocol control circuit further includes a discharge circuit coupled to the bus node through the common pin and the temperature sensitive element, the discharge circuit including a discharge current source and/or a discharge switch, wherein the discharge current source and/or the discharge switch discharges a voltage at the bus node to a predetermined reference potential through the common pin when the path switch is turned off.
In one embodiment, the protocol control circuit further includes a power pin coupled to the output node to receive the output power to provide power to the protocol control circuit, wherein in the power mode, the signal detection circuit obtains the temperature signal according to a voltage difference between the power pin and the common pin.
In one embodiment, the signal detection circuit includes a first current source or a first resistor coupled to the temperature sensitive element through the common pin for biasing the temperature sensitive element to generate the temperature signal.
In one embodiment, the signal detection circuit includes a first comparison circuit for comparing a divided voltage of the power pin with a divided voltage of the common pin to determine whether the temperature signal of the temperature sensitive device exceeds a temperature threshold.
In one embodiment, the signal detection circuit further comprises an offset voltage source for providing an offset voltage to adjust a divided voltage of the voltage on the power pin or a divided voltage of the voltage on the common pin, wherein the temperature threshold is related to the offset voltage.
In one embodiment, the signal measuring circuit includes at least one analog-to-digital conversion circuit for converting a divided voltage of the power pin and a divided voltage of the common pin to obtain the temperature signal.
In one embodiment, the signal detection circuit further includes a micro control unit for determining whether the temperature signal of the temperature sensitive element exceeds a temperature threshold according to the conversion result of the at least one analog-to-digital conversion circuit.
In one embodiment, the power supply circuit is characterized by one of the following: in the power supply starting mode, the first comparison circuit senses the voltage on the bus node through the shared pin to judge whether to control the path switch to conduct the power supply path so as to enter the power supply mode; or the signal testing circuit further comprises a second comparison circuit, which is used for sensing the voltage on the bus node through the shared pin in the power supply starting mode to judge whether to control the path switch to conduct the power supply path so as to enter the power supply mode.
In one embodiment, in the power-up mode, the at least one adc circuit senses a voltage at the bus node through the common pin to determine whether to control the path switch to turn on the power path to enter the power-up mode.
In one embodiment, the protocol control circuit further includes a switch control pin coupled to a control terminal of the path switch, wherein the path control circuit controls the path switch by controlling a voltage of the switch control pin.
In one embodiment, the protocol control circuit further includes a first configuration channel pin and a second configuration channel pin for receiving and transmitting a configuration of the output power of the power supply circuit, wherein the first configuration channel pin and the second configuration channel pin conform to a universal bus Type C specification (USB Type C).
In one embodiment, the protocol control circuit further includes a feedback control pin, wherein the protocol control circuit controls a level of an output voltage or an output current of the output power of the power conversion circuit through the feedback control pin.
In one embodiment, the protocol control circuit further includes a current sensing pin for sensing a current on the power path and a ground pin for providing a ground potential.
In one embodiment, the protocol control circuit is an integrated circuit that includes the 8 and only 8 pins.
From another perspective, the present invention also provides a protocol control circuit for a power supply circuit, the power supply circuit comprising: a power conversion circuit for converting an input power to generate an output power at an output node; a path switch coupled between the output node and a bus node for controlling a power path between the output node and the bus node; and a temperature sensitive element coupled to the bus node; the protocol control circuit is used for controlling the power conversion circuit and the path switch; the protocol control circuit includes: a shared pin coupled to the bus node through the temperature sensitive element, the shared pin being configured to correspondingly transmit signals of different functions in at least two different modes; and a signal detection circuit, for sensing the voltage on the bus node through the shared pin in a power-on mode to determine whether to control the path switch to turn on the power path to enter a power-on mode, wherein in the power-on mode, the path switch is turned off; and is used for receiving a temperature signal generated by the temperature sensitive element through the shared pin in the power supply mode so as to measure an environment temperature of the temperature sensitive element.
The purpose, technical content, features and effects of the invention will be more easily understood by the following detailed description of specific embodiments.
Drawings
Fig. 1 shows a schematic diagram of a prior art power supply circuit.
FIG. 2 is a schematic diagram of a power supply circuit according to the present invention.
FIG. 3 is a schematic diagram of a protocol control circuit in the power supply circuit according to an embodiment of the present invention.
FIG. 4 is a schematic diagram of a discharge circuit in the protocol control circuit according to an embodiment of the present invention.
FIG. 5A is a schematic diagram of a signal detection circuit in the protocol control circuit according to an embodiment of the present invention.
FIG. 5B is a schematic diagram of a signal detection circuit in the protocol control circuit according to an embodiment of the present invention.
FIG. 6A is a schematic diagram of a signal detection circuit in the protocol control circuit according to an embodiment of the present invention.
FIG. 6B is a schematic diagram of a signal detection circuit in the protocol control circuit according to an embodiment of the present invention.
FIG. 7 is a schematic diagram of a signal detection circuit in the protocol control circuit according to an embodiment of the present invention.
Detailed Description
The drawings in the present disclosure are schematic and are intended to show the coupling relationship between circuits and the relationship between signal waveforms, and the circuits, signal waveforms and frequencies are not drawn to scale.
FIG. 2 is a block diagram (power supply circuit 2) of a power supply circuit according to an embodiment of the present invention, the power supply circuit includes a control power conversion circuit 110, a protocol control circuit 300 and a path switch QP, wherein the protocol control circuit 300 is used for controlling the power conversion circuit 110 and the path switch QP, the power conversion circuit 110 is used for converting an input power to generate an output power at an output node NOUT; the path switch QP is coupled between the output node NOUT and the bus node NB for controlling a power path between the output node NOUT and the bus node NB.
Referring to fig. 3, fig. 3 shows a schematic diagram of a protocol control circuit (protocol control circuit 300) according to an embodiment of the present invention. The protocol control circuit 300 includes a shared pin 305 and a signal evaluation circuit 320.
The common pin 305 is coupled to the bus node NB through a temperature sensitive resistor RT, and the common pin 305 is used for correspondingly transmitting signals with different functions in at least two different modes. The signal evaluation circuit 320 is used for sensing the voltage at the bus node NB through the common pin 305 to determine whether to control the path switch QP to turn on the power path to enter the power supply mode in the power-on mode, wherein the path switch QP is turned off in the power-on mode. The signal measurement circuit 320 is further configured to receive a temperature signal generated by the temperature sensitive resistor RT through the shared pin 305 in the power supply mode to measure an ambient temperature of the temperature sensitive resistor RT. The temperature-sensitive resistor RT may be, for example, a Negative Temperature Coefficient (NTC) temperature-sensitive resistor or a positive temperature coefficient (PTC-positive temperature coefficient). In addition, according to the spirit of the present invention, the temperature sensitive resistor may be other temperature sensitive elements which are electrically sensitive to temperature and can detect the temperature.
As shown in fig. 2, in the present embodiment, the power conversion circuit 110 is a flyback power conversion circuit, which includes a primary side control circuit 112 for controlling the primary side switch 20 and a secondary side control circuit 113 for controlling the secondary side switch 50. However, according to the spirit of the present invention, the power conversion circuit is not limited thereto, and in other embodiments, the power conversion circuit may be other types of switching power conversion circuits, such as but not limited to buck, boost, or buck-boost switching power conversion circuits, or linear power conversion circuits.
In one embodiment, the protocol control circuit 300 is an integrated circuit that includes at least the "shared pin 305". In addition, it should be noted that "through the shared pin" means that, in the present embodiment, in different modes, a corresponding signal (e.g., a voltage on the bus node NB or a temperature signal generated by the temperature sensitive resistor RT) is transmitted from the outside of the protocol control circuit 300 to the inside of the protocol control circuit 300 through the shared pin 305, and the corresponding signal is sensed or received by an internal circuit (e.g., the signal measurement circuit 320). In other embodiments, passing through a specific pin may refer to receiving a corresponding signal from the outside of the protocol control circuit 300 to the inside of the protocol control circuit 300 through the specific pin, or transmitting a corresponding signal from the inside of the protocol control circuit 300 to the outside of the protocol control circuit 300 through the specific pin.
Referring to fig. 2, in an embodiment, the protocol control circuit 300 further includes a first configuration channel pin 307 and a second configuration channel pin 308 for receiving and transmitting configuration of the output power of the power supply circuit 100, wherein the first configuration channel pin 307 and the second configuration channel pin 308 conform to a universal bus Type C specification (USB Type C), and in this embodiment, the first configuration channel pin 307 and the second configuration channel pin 308 correspond to the configuration channel pins CC1 and CC2 of the universal bus Type C specification, respectively.
The "power-on mode" means that, in an embodiment where the power supply circuit 2 conforms to the universal bus Type C specification, for example, after the protocol control circuit 300 receives the configuration of the output power of the power supply circuit 100 through the first configuration channel pin 307 and the second configuration channel pin 308, the protocol control circuit 300 controls the power conversion circuit 110 to convert the input power VIN in the "power-on mode" and generate the output power corresponding to the configuration at the output node NOUT according to the configuration of the output power, as described above, in the "power-on mode", the path switch QP is turned off. Then, in the "power mode", the path switch QP is controlled to turn on the power path to enter the power mode, that is, in the power mode, the path switch QP is turned on, so that the voltage VBUS coupled to the bus node NB is equal to the output voltage VO to supply power to the subsequent load circuit coupled to the bus node NB.
The "arrangement" of the output power source means that, for example, the level of the output voltage VO or the output current IO of the output power source can be set through the first arrangement channel pin 307 and the second arrangement channel pin 308.
Referring to fig. 3, in an embodiment, the protocol control circuit 300 further includes a discharge circuit 330 coupled to the bus node NB through the common pin 305 and the temperature sensitive resistor RT. As shown in fig. 4, in an embodiment, the discharging circuit 330 includes a discharging current source 331 and/or a discharging switch 332, wherein the discharging current source 331 and/or the discharging switch 332 discharges the voltage VBUS on the bus node NB to a predetermined reference potential through the common pin 305 when the path switch QP is turned off. In one embodiment, the reference potential is, for example, ground potential. Specifically, according to the specification of universal bus Type C, for example, when the path switch QP is turned off due to shutdown or other reasons, the residual voltage on the bus node NB needs to be discharged to a threshold value (for example, ground) within a predetermined time, in this embodiment, the discharging circuit 330 can implement the discharging function through the shared pin 305 and the temperature sensitive resistor RT.
Referring to fig. 2, in an embodiment, the protocol control circuit 300 further includes a power pin 304 coupled to the output node NOUT for receiving an output power to provide the power to the protocol control circuit 300, wherein in the power mode, the signal detection circuit 320 obtains the temperature signal according to a voltage difference between the power pin 304 and the common pin 305. Specifically, as shown in fig. 2, in the power supply mode, the path switch QP is in an on state, and the on resistance thereof is negligible relative to the resistance of the temperature sensitive resistor RT, that is, the voltage difference between the power pin 304 and the shared pin 305 is substantially equal to the voltage difference on the temperature sensitive resistor RT, so that, according to the present invention, in the power supply mode, the signal measurement circuit 320 obtains the temperature signal according to the voltage difference between the power pin 304 and the shared pin 305. In one embodiment, the signal determination circuit 320 may obtain the temperature signal directly according to the voltage difference between the power pin 304 and the common pin 305, or in another embodiment, the signal determination circuit 320 may obtain the temperature signal indirectly according to the voltage difference between the power pin 304 and the common pin 305, that is, according to a signal (e.g., a divided voltage) related to the voltage difference, which will be described in detail later.
Referring to fig. 5A and 5B, fig. 5A and 5B show a schematic diagram of a signal measurement circuit (signal measurement circuit 320) in an embodiment of a protocol control circuit according to the present invention. In one embodiment, the signal detection circuit 320 includes a current source IS2 (fig. 5A) or a resistor R2 (fig. 5B) coupled to the temperature-sensitive resistor RT through the common pin 305 for biasing the temperature-sensitive resistor RT to generate the temperature signal, in particular, in an embodiment having a current source IS2, the voltage difference across the temperature-sensitive resistor RT IS related to the current source IS2, and in an embodiment having a resistor R2, the voltage difference across the temperature-sensitive resistor RT IS related to the resistance of the resistor R2, for example, the voltage difference across the temperature-sensitive resistor RT IS a divided voltage of the temperature-sensitive resistor RT and the resistor R2. In one embodiment, the current source IS2 and the resistor R2 may be used together.
As shown in fig. 5B, in the embodiment, the resistor R2 includes resistors R21 and R22 connected in series to divide the voltage VBT on the common pin 305, thereby obtaining the related signal of the temperature signal. As shown in fig. 5A, in the present embodiment, the divided voltage of the voltage VDD at the power pin 304 is obtained through the series connection of the resistors RD1 and RD 2.
Referring to fig. 5A and 5B, in one embodiment, the signal detection circuit 320 includes a comparison circuit 321 for comparing the divided voltage (V1) on the power pin 304 with the divided voltage (V2) of the voltage VBT on the common pin 305 to determine whether the temperature signal of the temperature sensitive resistor RT exceeds a temperature threshold. In detail, as shown in fig. 5A or 5B, in the present embodiment, since the temperature sensitive resistor RT is coupled between the common pin 305 and the bus node NB, in the power supply mode, the voltage VBUS at the bus node NB is substantially equal to the voltage VDD at the power pin 304, and therefore, in the present embodiment, the comparing circuit 321 uses the divided voltage of the voltage VDD at the power pin 304 as the comparing threshold to offset the variation of the voltage VDD.
It should be noted that, in an embodiment, the voltage division ratio may be a value greater than 0 and less than or equal to 1, and the voltage division ratio of the voltage on the power pin 304 and the voltage division ratio of the voltage VBT on the common pin 305 may be determined according to requirements, and is not limited herein.
Referring to fig. 5A and 5B, in an embodiment, at least one of the input terminals of the comparison circuit 321 may further include an offset voltage source for providing an offset voltage VOS to adjust the divided voltage of the voltage VDD on the power pin 304 or the divided voltage of the voltage VBT on the common pin 305.
It should be noted that, in the embodiments of fig. 5A and 5B, although the comparison circuit 321 does not directly measure the voltage difference across the temperature-sensitive resistor RT, the comparison between the divided voltage of the voltage VDD on the power pin 304 and the divided voltage of the voltage VBT on the common pin 305 can be regarded as obtaining the temperature signal through the information related to the voltage difference across the temperature-sensitive resistor RT.
In addition, when the comparison result CPO1 of the comparison circuit 321 represents that the temperature signal exceeds the temperature threshold, a protection operation may be performed, such as stopping power conversion, turning off the path switch QP, or notifying the related previous stage circuit or the next stage load circuit, in an embodiment.
Referring to fig. 6A and 6B, fig. 6A and 6B show a signal measurement circuit (signal measurement circuit 320') in another embodiment of the protocol control circuit of the present invention. In one embodiment, the signal detection circuit 320' includes at least one analog-to-digital conversion circuit for converting the divided voltage of the voltage VDD on the power pin 304 and the divided voltage of the voltage VBT on the common pin 305 to obtain the temperature signal. As shown, in the present embodiment, the signal detection circuit 320' includes analog-to-digital conversion circuits 322 and 323 for converting the divided voltage of the voltage VDD on the power pin 304 and the divided voltage of the voltage VBT on the common pin 305 into digital signals (SVD and SVB), respectively, and in one embodiment, the signal detection circuit 320 further includes a Micro Control Unit (MCU)324 for receiving and processing the digital signals SVD and SVB, thereby determining whether the temperature signal on the temperature sensitive resistor RT exceeds the temperature threshold. In another embodiment, the signal determination circuit 320' can convert the divided voltage of the voltage VDD on the power pin 304 and the divided voltage of the voltage VBT on the common pin 305 into digital signals by an analog-to-digital conversion circuit in a time-sharing manner.
Referring to fig. 5B, in an embodiment, the comparison circuit 321 may further be configured to sense the voltage VBUS at the bus node NB through the common pin 305 to determine whether to control the path switch QP to turn on the power path to enter the power supply mode, and in detail, as shown in fig. 5B, in the power supply start mode, the comparison circuit 321 may compare a divided voltage of the voltage VBT at the common pin 305 with a bus voltage threshold to determine whether to control the path switch QP to turn on the power path to enter the power supply mode, specifically, one input terminal of the comparison circuit 321 is coupled to the bus voltage threshold in the power supply start mode, and is coupled to the divided voltage VDD at the power pin 304 in the power supply mode.
Referring to fig. 7, fig. 7 shows a schematic diagram of a signal measurement circuit (signal measurement circuit 320) in the protocol control circuit according to an embodiment of the present invention. In one embodiment, the signal evaluation circuit 320 further includes another comparison circuit 340 for sensing the voltage VBUS at the bus node NB through the shared pin 305 to determine whether to control the path switch QP to turn on the power path to enter the power mode in the power-up mode, and in particular, in the present embodiment, the comparison circuit 340 compares the divided voltage VBT (related to the voltage VBUS at the bus node NB) at the shared pin 305 with the bus voltage threshold VTHB to determine whether to control the path switch QP to turn on the power path to enter the power mode.
Referring to fig. 6A and 6B, in an embodiment, in the power up mode, the adc 322 senses the voltage on the bus node NB through the common pin 305 to determine whether the control path switch QP turns on the power path to enter the power mode, and in detail, the adc 322 receives and converts the divided voltage of the voltage VBT on the common pin 305 (related to the voltage VBUS on the bus node NB) into a digital signal through the common pin 305, and then the mcu 324 determines whether the control path switch QP turns on the power path to enter the power mode.
Referring to fig. 2, in an embodiment, the protocol control circuit 300 further includes a switch control pin 306 and a driving circuit 310, the driving circuit 310 is coupled to the control terminal of the path switch QP through the switch control pin 306, wherein the driving circuit 310 controls the path switch QP by controlling the voltage of the switch control pin 306 according to the determination result of the signal detection circuit 320. In one embodiment, the protocol control circuit 300 further includes a feedback control pin 301, wherein the protocol control circuit 300 controls the output voltage value or the output current value of the output power of the power conversion circuit 110 through the feedback control pin 301. In this embodiment, the protocol control circuit 300 is coupled to the optical coupling element 370 through the feedback control pin 301, for example, to control the power conversion circuit 110 in a non-contact feedback manner. Of course, in other embodiments, the feedback control may be performed in a contact feedback manner. When the power conversion circuit 110 is another type of power conversion circuit, the feedback mode is adaptively set according to the requirement of the power conversion circuit, and is not limited herein.
Referring to fig. 2, in one embodiment, the protocol control circuit 300 further includes a current sensing pin 302 and a ground pin 303, wherein the current sensing pin 302 is used for sensing a current on the power path, and the ground pin 303 is used for providing a ground potential.
In one embodiment, the protocol control circuit 300 includes the 8 and only 8 pins (i.e., the pins 301 and 308).
The present invention has been described with respect to the preferred embodiments, but the above description is only for the purpose of making the content of the present invention easy to understand for those skilled in the art, and is not intended to limit the scope of the present invention. The embodiments described are not limited to single use, but may be used in combination, for example, two or more embodiments may be combined, and some components in one embodiment may be substituted for corresponding components in another embodiment. Further, equivalent variations and combinations are contemplated by those skilled in the art within the spirit of the present invention, and the term "processing or computing or generating an output result based on a signal" is not limited to the signal itself, and includes, if necessary, performing voltage-to-current conversion, current-to-voltage conversion, and/or scaling on the signal, and then processing or computing the converted signal to generate an output result. It is understood that equivalent variations and combinations are possible and will occur to those skilled in the art, which combinations are not intended to be exhaustive, within the same spirit of the invention. Accordingly, the scope of the present invention should be determined to encompass all such equivalent variations as described above.
Claims (25)
1. A power supply circuit, comprising:
a power conversion circuit for converting an input power to generate an output power at an output node;
a path switch coupled between the output node and a bus node for controlling a power path between the output node and the bus node;
a temperature sensitive element coupled to the bus node; and
a protocol control circuit for controlling the power conversion circuit and the path switch; the protocol control circuit includes:
a shared pin coupled to the bus node through the temperature sensitive element, the shared pin being configured to correspondingly transmit signals of different functions in at least two different modes; and
a signal detection circuit, for sensing the voltage on the bus node through the shared pin in a power-on mode to determine whether to control the path switch to turn on the power path to enter a power-on mode, wherein in the power-on mode, the path switch is turned off; and is used for receiving a temperature signal generated by the temperature sensitive element through the shared pin in the power supply mode so as to measure an environment temperature of the temperature sensitive element.
2. The power supply circuit of claim 1, wherein the protocol control circuit further comprises a discharge circuit coupled to the bus node through the common pin and the temperature sensitive element, the discharge circuit comprising a discharge current source and/or a discharge switch, wherein the discharge current source and/or the discharge switch discharges the voltage at the bus node to a predetermined reference potential through the common pin when the path switch is turned off.
3. The power supply circuit as claimed in claim 1, wherein the protocol control circuit further comprises a power pin coupled to the output node to receive the output power to provide power to the protocol control circuit, wherein in the power mode, the signal detection circuit obtains the temperature signal according to a voltage difference between the power pin and the common pin.
4. The power supply circuit of claim 1, wherein the signal detection circuit comprises a first current source or a first resistor coupled to the temperature sensitive device through the common pin for biasing the temperature sensitive device to generate the temperature signal.
5. The power supply circuit of claim 3, wherein the signal detection circuit comprises a first comparison circuit for comparing a divided voltage of the power pin with a divided voltage of the common pin to determine whether the temperature signal of the temperature sensitive device exceeds a temperature threshold.
6. The power supply circuit of claim 5, wherein the signal detection circuit further comprises an offset voltage source for providing an offset voltage to adjust a voltage division on the power pin or a voltage division on the common pin, wherein the temperature threshold is related to the offset voltage.
7. The power supply circuit of claim 3, wherein the signal detection circuit comprises at least one analog-to-digital conversion circuit for converting a divided voltage of the power pin and a divided voltage of the common pin to obtain the temperature signal.
8. The power supply circuit according to claim 7, wherein the signal detection circuit further comprises a micro control unit for determining whether the temperature signal of the temperature sensitive element exceeds a temperature threshold according to the conversion result of the at least one analog-to-digital conversion circuit.
9. The power supply circuit of claim 5, wherein one of:
in the power supply starting mode, the first comparison circuit senses the voltage on the bus node through the shared pin to judge whether to control the path switch to conduct the power supply path so as to enter the power supply mode; or
The signal detection circuit further comprises a second comparison circuit, which is used for sensing the voltage on the bus node through the shared pin in the power supply starting mode to judge whether to control the path switch to conduct the power supply path so as to enter the power supply mode.
10. The power supply circuit of claim 7, wherein in the power-up mode, the at least one analog-to-digital conversion circuit senses a voltage at the bus node via the common pin to determine whether to control the path switch to turn on the power path to enter the power-up mode.
11. A protocol control circuit for a power supply circuit, the power supply circuit comprising: a power conversion circuit for converting an input power to generate an output power at an output node; a path switch coupled between the output node and a bus node for controlling a power path between the output node and the bus node; and a temperature sensitive element coupled to the bus node; the protocol control circuit is used for controlling the power conversion circuit and the path switch; the protocol control circuit includes:
a shared pin coupled to the bus node through the temperature sensitive element, the shared pin being configured to correspondingly transmit signals of different functions in at least two different modes; and
a signal detection circuit, for sensing the voltage on the bus node through the shared pin in a power-on mode to determine whether to control the path switch to turn on the power path to enter a power-on mode, wherein in the power-on mode, the path switch is turned off; and is used for receiving a temperature signal generated by the temperature sensitive element through the shared pin in the power supply mode so as to measure an environment temperature of the temperature sensitive element.
12. The protocol control circuit of claim 11, further comprising a discharge circuit coupled to the bus node through the common pin and the temperature sensitive element, the discharge circuit comprising a discharge current source and/or a discharge switch, wherein the discharge current source and/or the discharge switch discharges the voltage at the bus node to a predetermined reference potential through the common pin when the path switch is turned off.
13. The protocol control circuit of claim 11, further comprising a power pin coupled to the output node to receive the output power to provide power to the protocol control circuit, wherein in the power mode, the signal detection circuit obtains the temperature signal according to a voltage difference between the power pin and the common pin.
14. The protocol control circuit of claim 11, wherein the signal detection circuit comprises a first current source or a first resistor coupled to the temperature sensitive element through the common pin for biasing the temperature sensitive element to generate the temperature signal.
15. The protocol control circuit of claim 13 wherein the signal detection circuit comprises a first comparison circuit for comparing the divided voltage of the power pin with the divided voltage of the common pin to determine whether the temperature signal of the temperature sensitive device exceeds a temperature threshold.
16. The protocol control circuit of claim 15, wherein the signal detection circuit further comprises an offset voltage source for providing an offset voltage to adjust a voltage division on the power pin or a voltage division on the common pin, wherein the temperature threshold is related to the offset voltage.
17. The protocol control circuit of claim 13 wherein the signal detection circuit comprises at least one analog-to-digital converter for converting the divided voltage of the power pin and the divided voltage of the common pin to obtain the temperature signal.
18. The protocol control circuit of claim 17, wherein the signal detection circuit further comprises a micro-control unit for determining whether the temperature signal of the temperature sensitive device exceeds a temperature threshold according to the conversion result of the at least one analog-to-digital conversion circuit.
19. The protocol control circuit of claim 15, wherein one of:
in the power supply starting mode, the first comparison circuit senses the voltage on the bus node through the shared pin to judge whether to control the path switch to conduct the power supply path so as to enter the power supply mode; or
The signal detection circuit further comprises a second comparison circuit, which is used for sensing the voltage on the bus node through the shared pin in the power supply starting mode to judge whether to control the path switch to conduct the power supply path so as to enter the power supply mode.
20. The protocol control circuit of claim 17 wherein in the power-up mode, the at least one analog-to-digital conversion circuit senses a voltage at the bus node via the common pin to determine whether to control the path switch to turn on the power path to enter the power-up mode.
21. The protocol control circuit of claim 13 further comprising a switch control pin coupled to a control terminal of the path switch, wherein the path control circuit controls the path switch by controlling a voltage of the switch control pin.
22. The protocol control circuit of claim 21 further comprising a first configuration channel pin and a second configuration channel pin for receiving and transmitting a configuration of the output power of the power supply circuit, wherein the first configuration channel pin and the second configuration channel pin conform to a universal bus Type C specification (USB Type C).
23. The protocol control circuit of claim 22 further comprising a feedback control pin, wherein the protocol control circuit controls a level of an output voltage or an output current of the output power of the power conversion circuit through the feedback control pin.
24. The protocol control circuit of claim 23 further comprising a current sense pin for sensing current in the power path and a ground pin for providing ground potential.
25. The protocol control circuit of claim 24 wherein the protocol control circuit is an integrated circuit comprising said 8 and only 8 pins.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US16/419,041 US10530264B1 (en) | 2018-06-28 | 2019-05-22 | Power supply circuit and protocol control circuit thereof |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201862691433P | 2018-06-28 | 2018-06-28 | |
| US62/691,433 | 2018-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN105632559A (en) * | 2014-11-24 | 2016-06-01 | 华邦电子股份有限公司 | Drain regulator for NOR flash memory |
| CN106612074A (en) * | 2015-10-26 | 2017-05-03 | 万国半导体(开曼)股份有限公司 | Power supply device |
| US9912224B2 (en) * | 2014-06-19 | 2018-03-06 | Richtek Technology Corporation | Power supply system and short circuit and/or bad connection detection method thereof, and power converter thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9252662B2 (en) * | 2013-04-17 | 2016-02-02 | Cooledge Lighting, Inc. | Illumination device control systems and methods |
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|---|---|---|---|---|
| US9912224B2 (en) * | 2014-06-19 | 2018-03-06 | Richtek Technology Corporation | Power supply system and short circuit and/or bad connection detection method thereof, and power converter thereof |
| CN105632559A (en) * | 2014-11-24 | 2016-06-01 | 华邦电子股份有限公司 | Drain regulator for NOR flash memory |
| CN106612074A (en) * | 2015-10-26 | 2017-05-03 | 万国半导体(开曼)股份有限公司 | Power supply device |
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| CN110661425A (en) | 2020-01-07 |
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