CN107493091B - Power supply method and device - Google Patents
Power supply method and device Download PDFInfo
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- CN107493091B CN107493091B CN201610412248.8A CN201610412248A CN107493091B CN 107493091 B CN107493091 B CN 107493091B CN 201610412248 A CN201610412248 A CN 201610412248A CN 107493091 B CN107493091 B CN 107493091B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/01—Details
- H03K3/015—Modifications of generator to maintain energy constant
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Abstract
The invention discloses a power supply method which is suitable for supplying power to an external electronic device with at least one voltage stabilizing capacitor with different specifications. The power supply method comprises the following steps: the method comprises the steps of generating a periodic signal, periodically switching a load switch circuit by using the periodic signal, enabling the load switch circuit to periodically charge and discharge a voltage stabilizing capacitor, generating a starting signal which is continuous with the periodic signal, continuously starting the load switch circuit by using the starting signal, enabling the load switch circuit to supply power to an external electronic device according to a flag signal, and determining the level of the flag signal by using the load switch circuit to detect the current amount of the power supply to the external electronic device. During the period of periodic charging and discharging, the current amount for supplying power to the external electronic device is reduced. The power supply method and the device thereof can charge the overlarge voltage-stabilizing capacitor to reach the normal working voltage so as to continuously supply power to the external electronic device.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to a power supply technology, and more particularly, to a power supply method and apparatus.
[ background of the invention ]
There are many different load-switch integrated circuits (load-switch ICs) on the market today. Basically, the load switch ICs all have an over-current protection (OCP) mechanism. The OCP mechanism may have one or more protection conditions. If all the conditions of the OCP mechanism are met, the load switch IC enters a protection mode. After entering the protection mode, the load switch IC is in an inoperable state unless the protection mode is released. Therefore, the OCP mechanism provides a relatively safe mechanism to avoid the risks derived from exceeding the OCP condition, such as the large current generated by the power source short-circuiting to ground, which may cause the electronic device to burn out and even cause fire.
In this case, the OCP mechanism can determine whether the output current is higher than the overcurrent protection point (critical current) by setting the overcurrent protection point. In addition to setting the critical current, it can also be determined whether the over-current event is long or short through blank time (blanking time). For example, when the blank time is 0.5 milliseconds (ms), if an over-current condition occurs and the duration is greater than 0.5 ms, the latch-off load switch IC is latched. In most cases, this mechanism of over-current protection of the load switch IC is sufficient, but some electronic devices have a voltage stabilizing capacitor with a large capacitance at the front end, so that a large current (which cannot be smaller than the critical current during the blank time) is instantaneously drawn at the initial stage of charging, and the load switch IC enters into the protection mode, and cannot charge the electronic device.
To solve this problem, it is of course the simplest way to adjust the critical current high so that the load switch IC can operate normally. However, since different electronic devices may have different voltage stabilizing capacitors with different capacitance values, the OCP mechanism of the load switch IC loses its stricter protection by increasing the critical current.
[ summary of the invention ]
In one embodiment, a power supply method is suitable for supplying power to an external electronic device having at least one voltage-stabilizing capacitor with different specifications. The power supply method comprises the following steps: the method comprises the steps of generating a periodic signal, periodically switching a load switch circuit by using the periodic signal, enabling the load switch circuit to periodically charge and discharge a voltage stabilizing capacitor, generating a starting signal which is continuous with the periodic signal, continuously starting the load switch circuit by using the starting signal, enabling the load switch circuit to supply power to an external electronic device according to a flag signal, and determining the level of the flag signal by using the load switch circuit to detect the current amount of the power supply to the external electronic device. During the period of periodic charging and discharging, the current amount for supplying power to the external electronic device is reduced.
In one embodiment, a power supply device is suitable for supplying power to an external electronic device having at least one voltage-stabilizing capacitor with different specifications. The power supply device includes: the load switch circuit is coupled with the signal generating circuit and the power supply port. The signal generating circuit is used for generating a periodic signal and an opening signal which is continuous with the periodic signal. The power supply port is used for being coupled with an external electronic device. When the load switch circuit receives the periodic signal, the load switch circuit responds to the periodic signal and periodically switches to periodically charge and discharge the voltage stabilizing capacitor. During the periodic charging and discharging period, the load switch circuit reduces the current amount for supplying power to the external electronic device. When the load switch circuit receives the opening signal, the load switch circuit supplies power to the external electronic device according to the flag signal, and detects the current amount supplied to the external electronic device to determine the level of the flag signal.
In summary, the power supply method and the device thereof according to the present invention are suitable for supplying power to external electronic devices having voltage-stabilizing capacitors with different specifications, so that under the condition of a protection mode without an OCP mechanism, an excessively large voltage-stabilizing capacitor is charged first to reach a normal operating voltage, and further, the external electronic devices are continuously supplied with power.
[ description of the drawings ]
Fig. 1 is a schematic diagram of a power supply device according to an embodiment of the invention.
Fig. 2 is a schematic diagram of another embodiment of a power supply device according to the invention.
Fig. 3 is a schematic diagram of a power supply device according to another embodiment of the invention.
Fig. 4 is a waveform diagram of the correlation signal of fig. 3.
FIG. 5 is a flowchart illustrating a power supply method according to an embodiment of the invention.
Fig. 6 is a flowchart of another embodiment of a power supply method according to the present invention.
[ detailed description ] embodiments
Fig. 1 is a schematic diagram of a power supply device according to an embodiment of the invention. Referring to fig. 1, a power supply apparatus 10 is adapted to supply power to external electronic devices 20 having different specifications of regulated capacitance values. In other words, the external electronic device 20 has a charging terminal P2i and one or more voltage-stabilizing capacitors Cs, and the voltage-stabilizing capacitors Cs are connected in parallel with the charging terminal P2 i. The charging/discharging circuit 210 is coupled between the charging/discharging circuit 210 and the charging terminal P2i, and the charging/discharging circuit 210 is coupled between the charging/discharging circuit 210 and the functional circuit 230. The charging/discharging circuit 210 receives the power input from the charging terminal P2i through the voltage-stabilizing capacitor Cs, and accordingly provides the power required by the function circuit 230.
The power supply device 10 includes: a signal generating circuit 110, a power supply port P1o, and a load switch circuit 130, wherein the load switch circuit 130 is coupled between the signal generating circuit 110 and the power supply port P1 o. The power port P1o of the power supply device 10 is coupled to the charging port P2i of the external electronic device 20, and the power port P1o may be in a hot swap type.
The signal generating circuit 110 generates a control signal Vc and provides the control signal Vc to the load switch circuit 130. The load switch circuit 130 receives the control signal Vc and provides power to the external electronic device 20 through the power supply port P1o according to the control signal Vc.
Here, the control signal Vc may include two forms: one form is a periodic signal applied during the initial charging period (see the first time period T1 of fig. 4), and the other form is an on signal during the normal charging period (see the second time period T2 of fig. 4).
During the initial charging period (i.e., the first time period T1 in fig. 4), the signal generating circuit 110 generates a periodic signal and uses the periodic signal to periodically switch the load switch circuit 130, so that the load switch circuit 130 periodically charges and discharges the voltage stabilizing capacitor Cs through the power port P1o and the charging port P2 i. During the periodic charging and discharging period (i.e., the initial charging period for generating the periodic signal), the load switch circuit 130 decrements the current amount Io supplied to the external electronic device 20 in response to the periodic signal.
After a predetermined time, the signal generating circuit 110 generates the turn-on signal following the periodic signal, and uses the turn-on signal to continuously turn on the load switch circuit 130, so that the load switch circuit 130 provides power to the external electronic device 20 through the power port P1o and the charging port P2i according to a flag signal. During the period of generating the on signal (i.e., the normal charging period, such as the second time period T2 shown in fig. 4), the load switch circuit 130 detects the current amount Io supplied to the external electronic device 20, and determines the level of the flag signal according to the detected current amount Io. The determination of the level of the flag signal will be described in detail later.
The periodic signal is a signal in which the first level and the second level are alternately generated for a plurality of times, and the start signal is maintained at the second level, wherein the first level is higher than the second level in the present embodiment. Herein, the time of each second level of the periodic signal is less than the time of the second level of the turn-on signal. In other words, the signal generating circuit 110 repeatedly and alternately outputs the first level and the second level within a predetermined time period, and then maintains the output at the second level.
Here, the load switch circuit 130 is in an on state when receiving the second level, and is in an off state when receiving the first level.
The present invention is technically characterized in that, by properly adjusting the periodic charging/discharging time (i.e. the sum of the time of the first level and the second level of the periodic signal), the power supply apparatus 10 can effectively raise the power supply voltage over time and simultaneously reduce the charging current (the current amount Io of the power supply).
Fig. 2 is a schematic diagram of another embodiment of a power supply device according to the invention. In one embodiment, when the power port P1o of the power supply apparatus 10 is in a non-hot-plug mode, the power supply apparatus 10 further includes a power start unit 150, as shown in fig. 2, wherein the power start unit 150 may be a virtual key or a physical key. The user triggers the power supply start unit 150 to cause the power supply start unit 150 to output a power supply start signal Son to the signal generating circuit 110. The signal generating circuit 110 receives the power-on start signal Son, and starts generating the periodic signal in response to the power-on start signal Son. After generating the periodic signal for a predetermined time, the signal generating circuit 110 changes the periodic signal from the first time period T1 to the turn-on signal of the second time period T2.
Specifically, during the period of generating the on signal, the load switch circuit 130 detects the amount of current Io supplied to the external electronic device 20. When the detected current amount Io does not reach the protection condition of the current-current protection (OCP) mechanism, the load switch circuit 130 generates a flag signal of the third level, so that the load switch circuit 130 continuously supplies power to the external electronic device 20 in response to the turn-on signal. On the contrary, when the detected current amount Io reaches the protection condition of the OCP mechanism, the load switch circuit 130 generates a flag signal of the fourth level, so that the load switch circuit 130 stops supplying power to the external electronic device 20. In other words, when the flag signal is at the third level, the load switch circuit 130 operates normally, i.e., the on signal controls the load switch circuit 130 to continuously supply power to the external electronic device 20. When the flag signal is at the fourth level, the load switch circuit 130 is forced to stop, i.e. the load switch circuit 130 is not controlled by the start signal to forcibly stop supplying power to the external electronic device 20.
Fig. 3 is a schematic diagram of a power supply device according to another embodiment of the invention. In some embodiments, referring to fig. 3, the load switch circuit 130 may be implemented by a load-switch integrated circuit (load-switch IC) LS. The load switch ICLS has a power-on pin Jo and a power-supply pin Jt. The enable pin Jo of the load switch ICLS is coupled to the signal generating circuit 110 and receives the control signal Vc from the signal generating circuit 110. The power supply pin Jt of the load switch ICLS is coupled to the power supply port P1o, and provides power to the external electronic device 20 through the power supply port P1 o.
In some embodiments, the signal generating circuit 110 includes a grounding switch Ms and a control unit 112. The control unit 112 is coupled to the control terminal of the grounding switch Ms. The first end of the grounding switch Ms is electrically connected to the power source terminal and the starting pin Jo of the load switch ICLS. The second terminal of the grounding switch Ms is electrically connected to ground.
The control unit 112 outputs a turn-off signal to the grounding switch Ms to turn off (off) the grounding switch Ms. At this time, the enable pin Jo of the load switch ICLS is electrically connected to the power source terminal, so that the enable pin Jo of the load switch ICLS is pulled to a high level (i.e., the control signal Vc of the first level). At this time, the load switch ICLS is in the off state.
The control unit 112 outputs a turn-on signal to the grounding switch Ms to turn on (on) the grounding switch Ms. At this time, the enable pin Jo of the load switch ICLS is electrically connected to the ground by the ground switch Ms, so that the enable pin Jo of the load switch ICLS is pulled to the low level (i.e., the control signal Vc of the second level). At this time, the load switch ICLS is in an active state, and the load switch ICLS outputs power to the power port P1o through the power pin Jt.
Fig. 4 is a waveform diagram of the correlation signal of fig. 3. During the first time period T1 (i.e., the initial charging period), the control unit 112 repeatedly and alternately switches the grounding switch Ms, so that the enable pin Jo of the load switch ICLS is repeatedly and alternately at the high level and the low level (i.e., the periodic signal). Also, during the first time period T1, the momentary large current Ip generated at the beginning of charging induces the load switch ICLS to generate the low level flag signal Vf (i.e., the fourth level flag signal). The present invention is technically characterized in that the load switch IC is reset by the periodic signal, and the flag signal Vf generated by the load switch ICLS is restored to the high level (i.e., the flag signal of the fifth level), so that the power supply pin Jt of the load switch ICLS can maintain power supply. During a first time period T1, the supply voltage Vo output by the supply pin Jt of the load switch ICLS gradually increases until it stabilizes; at the same time, the charging current (the current amount Io of the power supply) gradually decreases.
Then, for a second time period T2 (i.e., a normal charging period), the control unit 112 controls the ground switch Ms to be maintained at the on state, so that the enable pin Jo of the load switch ICLS is maintained at the low level (i.e., the control signal Vc is an on signal). During the second time period T2, the load switch ICLS outputs the power supply voltage Vo from the power supply pin Jt to the power supply port P1o according to the level of the flag signal Vf and the level of the control signal Vc (i.e., the turn-on signal), so as to supply power to the external electronic device 20.
Here, an output capacitor Co is externally connected to the power supply pin Jt of the load switch ICLS, and the output capacitor Co is coupled between the power supply pin Jt and the ground. The load switch ICLS further includes a power supply pin Ji, a power good pin (Jp), a current limit setting pin Js, a fault indication pin Jf, and a ground pin Jg. The power pin Ji is electrically connected to a power source terminal, and a power supply capacitor Ci is coupled between the power pin Ji and ground. The power out good pin Jp is coupled to ground. The current limit setting pin Js is coupled to ground through a current limit resistor Rs. The fault indication pin Jf is coupled to the power source terminal through a pull-up resistor Rf. The ground pin Jg is coupled to ground.
In some embodiments, the signal generating circuit 110 further includes four resistors R1, R2, R3, R4. The resistor R1 is coupled between the power source terminal and the first terminal of the ground switch Ms, and the resistor R2 is coupled between the first terminal of the ground switch Ms and the enable pin Jo. Resistor R3 is coupled between enable pin Jo and ground. The resistor R4 is coupled between the control terminal of the grounding switch Ms and the ground. The second terminal of the grounding switch Ms is coupled to the ground. The ground switch Ms may be a metal-oxide-semiconductor field-effect transistor (MOSFET), and the first terminal, the second terminal and the control terminal of the ground switch Ms may be a drain, a source and a gate, respectively.
In view of the above, the present invention also provides a power supply method. The power supply method is suitable for supplying power to external electronic devices 20 with voltage-stabilizing capacitors Cs of different specifications. Referring to fig. 5, a flowchart of an embodiment of a power supply method according to the invention is shown. The power supply method includes generating a periodic signal (step S310), periodically switching the load switch circuit 130 using the periodic signal to cause the load switch circuit 130 to periodically charge and discharge the voltage stabilizing capacitor Cs (step S330), generating a turn-on signal following the periodic signal (step S350), continuously turning on the load switch circuit 130 using the turn-on signal to cause the load switch circuit 130 to supply power to the external electronic device 20 according to the flag signal Vf (step S370), and determining the level of the flag signal Vf by using the load switch circuit 130 to detect the Io of the power supplied to the external electronic device 20 (step S390). During the period of periodic charging and discharging, the current amount for supplying power to the external electronic device is reduced. Therefore, by properly adjusting the periodic charging/discharging time (i.e., the sum of the time of the first level and the second level of the periodic signal), the supply voltage can be effectively stepped up with time and the charging current (the current amount Io of the supply) can be reduced at the same time.
In some embodiments, the periodic signal and the open signal are repeatedly and alternately generated while supporting the hot plug mode (i.e., after step S390, the process returns to step S310 and the subsequent steps).
Fig. 6 is a flowchart of another embodiment of a power supply method according to the present invention. In some embodiments, when the hot plug mode is not supported, the power supply method further includes receiving a power supply start signal (step S301), as shown in fig. 6. At this time, step S310 is performed in response to the power supply start signal, that is, in response to the power supply start signal, a periodic signal is generated (step S310').
In some embodiments, the periodic signal is a signal in which a first level and a second level are alternately generated, and the turn-on signal is a signal maintained at the second level. Wherein, the time of each second level of the periodic signal is less than the time of the second level of the start signal.
Here, the load switch circuit 130 is in an on state when receiving the second level, and is in an off state when receiving the first level.
In summary, the power supply method and the device thereof according to the present invention are suitable for supplying power to the external electronic device 20 having different specifications of the voltage-stabilizing capacitor Cs, so that under the condition of the protection mode without the OCP mechanism, the excessively large voltage-stabilizing capacitor Cs is charged first to reach the normal operating voltage, and then the external electronic device 20 is continuously supplied with power.
Claims (12)
1. A power supply method is suitable for supplying power to an external electronic device with at least one voltage stabilizing capacitor with different specifications, and is characterized by comprising the following steps:
generating a periodic signal;
using the periodic signal to periodically switch a load switch circuit to enable the load switch circuit to periodically charge and discharge the at least one voltage stabilizing capacitor, wherein during the periodic charge and discharge, the current amount of the external electronic device is supplied by the power in a descending manner;
generating an opening signal continuous to the periodic signal;
continuously turning on the load switch circuit by using the turn-on signal, so that the load switch circuit supplies power to the external electronic device according to a flag signal; and
the level of the flag signal is determined by detecting the amount of current supplied to the external electronic device by the load switch circuit.
2. The method according to claim 1, wherein the periodic signal is a signal in which a first level and a second level are alternately generated, the on signal is maintained at the second level, and the time of each of the second levels of the periodic signal is shorter than the time of the second level of the on signal.
3. The method of claim 2, wherein the load switch circuit is turned on when receiving the second level and turned off when receiving the first level.
4. The power supply method of claim 1, wherein the periodic signal and the turn-on signal are alternately generated repeatedly.
5. The power supply method of claim 1, wherein the step of generating a periodic signal further comprises:
a power-on start signal is received, wherein the generating of the periodic signal includes generating the periodic signal in response to the power-on start signal.
6. The power supply method of claim 1, wherein the step of using the enable signal to continuously enable the load switch circuit to provide power to the external electronic device according to a flag signal comprises:
when the flag signal is at a third level, the load switch circuit is enabled to respond to the starting signal to continuously supply power to the external electronic device; and
when the flag signal is at the fourth level, the load switch circuit is caused to stop supplying power to the external electronic device.
7. A power supply device, suitable for supplying power to an external electronic device having at least one voltage-stabilizing capacitor with different specifications, the power supply device comprising:
a signal generating circuit for generating a periodic signal and a turn-on signal following the periodic signal;
a power supply port for coupling with the external electronic device; and
a load switch circuit coupled to the signal generating circuit and the power supply port;
when the load switch circuit receives the periodic signal, the load switch circuit responds to the periodic signal to periodically switch to periodically charge and discharge the at least one voltage-stabilizing capacitor, and during the periodic charge and discharge, the load switch circuit gradually reduces the current amount for supplying power to the external electronic device; and
when the load switch circuit receives the opening signal, the load switch circuit supplies power to the external electronic device according to a flag signal, and detects the current amount supplied to the external electronic device to determine the level of the flag signal.
8. The power supply of claim 7 wherein the periodic signal is a signal in which a first level and a second level are alternately generated, the turn-on signal is maintained at a fifth level, and the time of the second level of the periodic signal is shorter than the time of the fifth level of the turn-on signal.
9. The power supply of claim 8 wherein the load switch circuit is active when receiving the second level and is inactive when receiving the first level.
10. The power supply of claim 9 wherein the signal generating circuit repeatedly generates the periodic signal and the turn-on signal alternately.
11. The power supply device according to claim 7, further comprising:
the signal generating circuit receives the power supply starting signal and generates the periodic signal in response to the power supply starting signal.
12. The power supply apparatus of claim 7 wherein the load switch circuit continuously powers the external electronic device in response to the enable signal when the flag signal is at a third level; and when the flag signal is at a fourth level, the load switch circuit stops supplying power to the external electronic device.
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| CN201610412248.8A CN107493091B (en) | 2016-06-13 | 2016-06-13 | Power supply method and device |
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| CN201610412248.8A CN107493091B (en) | 2016-06-13 | 2016-06-13 | Power supply method and device |
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