CN106207976A - Overcurrent protection chip and overcurrent protection circuit of power supply - Google Patents

Abstract

The invention provides an overcurrent protection chip and an overcurrent protection circuit of a power supply. The overcurrent protection chip comprises three input ends, a first memory module, a second memory module and a switching selection circuit. The three input terminals are respectively used for receiving the correction data, the first current load potential and the second current load potential. The switching selection circuit is used for comparing the correction data with the first current load potential and comparing the correction data with the second current load potential. Wherein the correction data is stored in one of the memory cells of the first memory module when the correction data corresponds to the first current load potential. When the correction data coincides with the second current load, the correction data is stored in one memory cell of the second memory module.

Description

Over-current protection chip and over-current protection circuit of power supply

technical field

The invention relates to an overcurrent protection chip and an overcurrent protection circuit of a power supply, in particular to an overcurrent protection chip and an overcurrent protection circuit of a power supply capable of setting multiple sets of overcurrent protection values.

Background technique

The power supply is used to supply power to the electronic device. In order to prevent the electronic device from being overloaded beyond the safe load range of the power supply, the power supply is usually equipped with an overcurrent protection (OCP) circuit to detect the load. current, and output an over-current protection signal when the load current is higher than the upper limit of the load, so as to notify the power supply to take corresponding protection measures, such as shutting down.

Please refer to FIG. 1 . FIG. 1 is a schematic diagram of a conventional power supply overcurrent protection circuit 10 coupled to a calibration tool and a load machine 120 . The overcurrent protection circuit 10 is disposed in the power supply for providing overcurrent protection of the power supply. The over-current protection chip 100 is used to provide an over-current protection value 140 for setting the current value of the over-current protection circuit 10 when the over-current protection mechanism is activated. When the output current of the power supply exceeds the set over-current protection value 140, the over-current protection circuit 10 will activate its over-current protection mechanism. In order to meet the over-current protection needs of different power supplies, the over-current protection chip 100 is designed to calibrate its over-current protection value 140 . When correcting the overcurrent protection value 140, the overcurrent protection chip 100 will be coupled with the calibration tool 110 and the load machine 120, so that the calibration tool 110 and the load machine 120 can calibrate the overcurrent protection chip 100, and complete the calibration Sometimes the overcurrent protection chip 100 generates the correction data 130 . The correction data 130 will be stored in the overcurrent protection chip 100, and when the overcurrent protection chip 100 leaves the factory and is installed in the power supply, the overcurrent protection chip 100 can generate an overcurrent in real time according to the stored correction data 130 The protection value 140 is used to set the current value of the over-current protection circuit 10 when the over-current protection mechanism is activated.

However, since the correction data 130 stored in the overcurrent protection chip 100 cannot be changed after the overcurrent protection chip 100 leaves the factory, the power supply factory must change its specification and design after producing the power supply. , the overcurrent protection chip 100 in the power supply cannot be recalibrated for recycling. Furthermore, when the power supply needs multiple sets of over-current protection settings, the over-current protection chip 100 can only provide one set of over-current protection values 140 , which is not enough for use. In addition, if the power supply has multiple sets of over-current protection values 140 that need to be corrected, the load machine 120 must cooperate with the correcting sequence of the multiple over-current protection chips 100 , and the correcting sequence cannot be changed arbitrarily, which lacks flexibility.

Contents of the invention

The invention provides an overcurrent protection chip of a power supply. The overcurrent protection chip includes a first input terminal, a second input terminal, a third input terminal, a first memory module, a second memory module and a switch selection circuit. The first input terminal is used for receiving calibration data. The second input end is used for receiving the first current load potential. The third input end is used for receiving the second current load potential. Each of the first memory module and the second memory module includes at least one memory unit, and each memory unit is used to record an overcurrent protection value. The switching selection circuit is coupled to the first input terminal, the second input terminal and the third input terminal, and is used for comparing the calibration data with the first current load potential, and comparing the calibration data with the second current load potential. Wherein when the correction data corresponds to the first current load potential, the correction data is stored in a memory unit of the first memory module. When the correction data coincides with the second current load potential, the correction data is stored in a memory cell of the second memory module.

The invention also provides an overcurrent protection circuit of the power supply. The overcurrent protection circuit includes a plurality of overcurrent protection chips, wherein each overcurrent protection chip includes a first input terminal, a second input terminal, a third input terminal, a first memory module, a second memory module, a switching selection circuit, a slot A bit comparison unit, a first selection switch and a second selection switch. The first input terminal is used for receiving calibration data. The second input end is used for receiving the first current load potential. The third input end is used for receiving the second current load potential. Each of the first memory module and the second memory module includes at least one memory unit, and each memory unit is used to record an overcurrent protection value. The switching selection circuit is coupled to the first input terminal, the second input terminal and the third input terminal, and is used for comparing the calibration data with the first current load potential, and comparing the calibration data with the second current load potential. Wherein when the correction data corresponds to the first current load potential, the correction data is stored in a memory unit of the first memory module. When the correction data coincides with the second current load potential, the correction data is stored in a memory cell of the second memory module. The slot comparing unit is used for comparing the slot comparing command and the slot position, so as to output the enable signal and determine the potential of the enable signal. The first selection switch is used for controlling the electrical connection between the first input end, the switching selection circuit and the first memory module according to the enable signal. The second selection switch is used for controlling the electrical connection between the first input end, the switching selection circuit and the second memory module according to the enabling signal. The slot comparison units of the plurality of overcurrent protection chips are coupled to each other, and receive slot comparison commands and slot positions respectively.

Description of drawings

FIG. 1 is a schematic diagram of a conventional overcurrent protection circuit of a power supply coupled to a calibration tool and a load machine.

FIG. 2 is a schematic diagram of an overcurrent protection circuit of a power supply coupled to a calibration tool and a load machine according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of a switching selection circuit of an overcurrent protection chip according to an embodiment of the present invention.

4 is a schematic diagram of a power supply overcurrent protection circuit coupled to a calibration tool and a load machine according to another embodiment of the present invention.

FIG. 5 is a flow chart of calibrating the overcurrent protection chip in FIG. 2 .

FIG. 6 is a flow chart of calibrating the multiple overcurrent protection chips in FIG. 4 .

FIG. 7 is a flow chart of the power supply installed with the overcurrent protection chip shown in FIG. 2 from calibration to delivery.

【Symbol Description】

10, 20, 30 Overcurrent protection circuit

110 correction tools

120 load machine

130, 130A, 130B, 130C, 130D, D _S correction data

140, 240A, 240B, 240C, 240D overcurrent protection value

100, 200, 200_1, 200_2 overcurrent protection chip

210 switch selection circuit

212A, 212B load comparison unit

214 Calibration group selector

216 Comparators

217 Potential adjustment unit

218 decoder

220 slot comparison unit

224A first memory module

224B Second memory module

230A, 230B heavy duty selector

A1 to AX, B1 to BX memory cells

E _N1 , E _N2 enable signal

I _A1 load current

I _A2 current

Iv1 to Ivn current source

P1 to P3 input

V _A1 first current load potential

V _A2 first correction current sense potential

V _B1 second current load potential

V _B2 second correction current sense potential

V _C1 third current load potential

V _C2 third correction current sense potential

V _D1 fourth current load potential

V _D2 fourth correction current sense potential

V _S1 first output level

V _S2 second output level

Vcs voltage input terminal

V1 to Vn switch control signal

R _A1 , R _A2 , R _B2 , R _C2 , R _D2 resistors

S1, S2 slot positions

S _COM slot comparison command

SW ₁ , SW ₂ selection switch

SW, SW _A , SW _B switches

S410 to S460, S510 to S550, S610 to S670 steps

T1 to T3 input

detailed description

Please refer to Figure 2. FIG. 2 is a schematic diagram of a power supply overcurrent protection circuit 20 coupled to a calibration tool 110 and a load machine 120 according to an embodiment of the present invention. The overcurrent protection circuit 20 is disposed in the power supply for providing multiple sets of overcurrent protection values for the power supply. In this embodiment, the overcurrent protection circuit 20 has an overcurrent protection chip 200 , and the overcurrent protection chip 200 can provide two sets of overcurrent protection values 240A and 240B for the power supply. However, the present invention is not limited thereto, and each overcurrent protection chip 200 can also be designed to provide three or more sets of overcurrent protection values.

With the provided two sets of over-current protection values 240A and 240B, the over-current protection chip 200 can set two sets of current values when the over-current protection circuit 20 activates the over-current protection mechanism. When the output current of any of the two sets of power outputs of the power supply exceeds the set over-current protection value 240A or 240B, the over-current protection circuit 20 will activate its over-current protection mechanism. Likewise, in order to meet the over-current protection specifications of different power supplies, the over-current protection chip 200 is designed to calibrate its over-current protection values 240A and 240B respectively. When correcting the overcurrent protection values 240A and 240B, the overcurrent protection chip 200 will be coupled with the calibration tool 110 and the load machine 120, so that the calibration tool 110 and the load machine 120 can calibrate the overcurrent protection chip 200, and then When the calibration is completed, the overcurrent protection chip 200 is made to generate the calibration data 130A and 130B. The correction data 130A and 130B will be respectively stored in the first memory module 224A and the second memory module 224B of the overcurrent protection chip 200, and when the overcurrent protection chip 200 leaves the factory and is installed in the power supply, the overcurrent protection chip 200 can generate overcurrent protection values 240A and 240B in real time according to the correction data 130A and 130B stored in the first memory module 224A and the second memory module 224B, so as to set the overcurrent protection circuit 20 when the overcurrent protection mechanism is activated. Two sets of current values.

In this embodiment, the overcurrent protection chip 200 includes three input terminals P1 to P3 , a first memory module 224A, a second memory module 224B, and a switching selection circuit 210 . The three input terminals P1 to P3 are respectively used to receive the calibration data D _S from the calibration tool 110 , and receive the first current load potential V _A1 and the second current load potential V _B1 from the load machine 120 . The switch selection circuit 210 is coupled to the three input terminals P1 to P3 of the overcurrent protection chip 200, and is used for comparing the calibration data D _S with the first current load potential V _A1 , and comparing the calibration data D _S with the second current load potential V _B1 . In this embodiment, each of the first memory module 224A and the second memory module 224B includes a plurality of memory units A1 to AX and B1 to BX, and each memory unit is used to record an overcurrent protection value. Wherein, the number of memory units included in the first memory module 224A and the second memory module 224B can be adjusted as needed, for example, the first memory module 224A and the second memory module 224B can have only one memory unit respectively.

In addition, the overcurrent protection correction of the overcurrent protection chip 200 is achieved by switching the selection circuit 210 to compare the correction data D _S , the first current load potential V _A1 and the second current load potential V _B1 . In detail, during the process of overcurrent protection calibration for the overcurrent protection chip 200, before the calibration of the current protection chip 200 is completed, the calibration tool 110 will continuously output different calibration data D _S , and when the calibration data D When _S matches the first current load potential V _A1 , the correction of the overcurrent protection value 240A is completed; and when the correction data D _S matches the second current load potential V _B1 , the correction of the overcurrent protection value 240B is completed. As for how to judge whether the correction data D _S is consistent with the current load potential (such as V _A1 and/or V _B1 ) provided by the load machine 120, please refer to the patent application No. 101139698 filed by the applicant on October 26, 2012 scheme, or refer to the description of Figure 3 later. In addition, when the corrected data D _S matches the first current load potential V _A1 (for example, the corrected data D _S at this time is the corrected data 130A), the corrected data D _S will be stored in the memory unit A1 of the first memory module 224A. to a memory cell in AX; and when the corrected data D _S matches the second current load potential V _B1 (for example: the corrected data D _S at this time is the corrected data 130B), the corrected data D _S will be stored in the second One of the memory cells B1 to BX of the memory module 224B. After that, the overcurrent protection chip 200 can output two sets of overcurrent protection values 240A and 240B according to the calibration data respectively stored in the first memory module 224A and the second memory module 224B. Since the overcurrent protection chip 200 can provide two sets of current protection values 240A and 240B, compared with the overcurrent protection chip 100 in the prior art, which can only provide one set of overcurrent protection values 140, the overcurrent protection chip 200 is more suitable Used for power supplies that can provide multiple sets of power outputs (such as multiple sets of different voltages). In addition, since the first current load potential V _A1 and the second current load potential V _B1 provided by the load machine 120 can be set separately, and when the correction data D _S and the first current load potential V _A1 or the second current load When the potential V _B1 matches, the correction of the overcurrent protection value 240A or 240B is completed. Therefore, the sequence of the current protection value 240A and 240B to be corrected by the overcurrent protection chip 200 may vary according to the actual situation, and is not subject to specific correction. order constraints. In detail, the calibration of the current protection value 240A can be completed first and then the calibration of the current protection value 240B, or the calibration of the current protection value 240B can be completed first and then the calibration of the current protection value 240A can be completed. In addition, if the first current load potential V _A1 is set to be the same as the second current load potential V _B1 , the setting of the current protection values 240A and 240B can be completed at the same time.

In an embodiment of the present invention, the switch selection circuit 210 includes two load comparison units 212A and 212B, a correction group selector 214 and two switches SW _A and SW _B . The load comparison units 212A and _212B are coupled to the voltage input terminal Vcs through resistors _RA2 and RB2 respectively. The load comparison unit 212A can adjust the first calibration current sense potential V _A2 of the load comparison unit 212A according to the calibration data D _S . Similarly, the load comparing unit 212B can adjust the second corrected current sense potential V _B2 of the load comparing unit 212B according to the corrected data D _S . As for how the load comparing units 212A and 212B respectively adjust the first calibration current-sensing potential V _A2 and the second calibration current-sensing potential V _B2 according to the calibration data D _S , further description will be given below. In addition, the switch SW _A is used to control the electrical connection between the calibration tool 110 and the first memory module 224A, and the switch SW _B is used to control the electrical connection between the calibration tool 110 and the second memory module 224B. The calibration group selector 214 is coupled to the output terminals of the two load comparison units 212A and 212B. When the first calibration current induction potential V _A2 is equal to the first current load potential V _A1 , the calibration group selector 214 turns on SW _A so that the calibration data D _S is stored in a memory unit of the first memory module 224A. Similarly, when the second correction current sensing potential V _B2 is equal to the second current load potential V _B1 , the correction group selector 214 turns on SW _B so that the correction data _DS is stored in a memory unit of the second memory module 224B .

How to determine whether the calibration data _DS is consistent with the current load potential (such as V _A1 and/or V _B1 ) provided by the load machine 120 will be further described below. Please refer to FIG. 3 , which is a schematic diagram of a switching selection circuit 212A of an overcurrent protection chip according to an embodiment of the present invention. The load comparison unit 212A is coupled to the resistors R _A1 and R _A2 , and includes three input terminals T1 to T3 , a comparator 216 , a potential adjustment unit 217 and a decoder 218 . Wherein, the three input terminals T1 to T3 are respectively coupled to the input terminal P2, the voltage input terminal Vcs and the input terminal P1 of the overcurrent protection chip 200 to respectively receive the first current load potential V _A1 , the system voltage and the calibration data D _S . A first end of the resistor R _A1 (current detection resistor) is coupled to the voltage input terminal Vcs, and a second end of the resistor R _A1 is coupled to the load machine 120 . A first end of the resistor R _A2 is coupled to the voltage input end Vcs. The first current load potential V _A1 received by the input terminal T1 is also the voltage signal of the second terminal of the resistor R _A1 . Since the load current I _A1 will flow through the resistor R _A1 , the voltage drop between the first terminal and the second terminal of the resistor R _A1 will be proportional to the magnitude of the load current I _A1 , so the voltage signal at the second terminal of the resistor R _A1 ( That is, the first current load potential V _A1 ) can be used as a load current detection signal. The input terminal T2 is used for receiving the first calibration current sensing potential V _A2 , that is, the voltage signal of the second terminal of the resistor R _A2 . The magnitude of the first correction current-induced potential V _A2 is determined by the potential adjustment unit 217 . The first input terminal of the comparator 216 is coupled to the input terminal T1, the second input terminal of the comparator 216 is coupled to the input terminal T2, and the comparator 216 is used for comparing the first current load potential V _A1 and the first correction current sense potential V _A2 outputs the first output level V _S1 at its output terminal. In this embodiment, when the first current load potential V _A1 is lower than the first correction current induction potential V _A2 , the first output level V _S1 rises from a low voltage level to a high voltage level, that is, at the output terminal Outputting an over-current protection signal to notify the power supply to take corresponding protection measures, such as shutdown or other operations.

The potential adjustment unit 217 is coupled to the input terminal T2. In this embodiment, the potential adjustment unit 217 includes a plurality of current sources Iv1 to Ivn and a plurality of switches SW. A plurality of switches SW are respectively coupled between a plurality of current sources Iv1 to Ivn and the ground terminal, and are used to turn on and off according to the switch control signals V1 to Vn, so as to control the magnitude of the current I _A2 flowing through the resistor R _A2 , and then adjust The first corrected current-induced potential V _A2 . The decoder 218 is used to output a plurality of switch control signals V1 to Vn to the plurality of switches SW according to the received correction data D _S , so as to control the opening and closing of the plurality of switches SW. For example, in the overcurrent protection setting state of the power supply of the present invention, the calibration tool 110 will provide a predetermined load, so that the load current I _A1 passing through the resistor R _A1 is the upper limit of the load. The calibration tool 110 transmits the calibration data _DS to the decoder 218 via the input terminal T3. The correction data D _S includes a plurality of setting values, and each setting value can be decoded by the decoder 218 into a plurality of switch control signals V1 to Vn, so as to control the opening and closing of the plurality of switches SW, and further control the flow through the resistor R The magnitude of the current I _A2 of _A2 (that is, to control the first correction current induction potential V _A2 ). The potential adjustment unit 217 gradually adjusts the first correction current induction potential V _A2 according to multiple set values until the first output level V _S1 output by the comparator 216 transitions (for example, from a low voltage level to a high voltage level). level, or drop from a high voltage level to a low voltage level), at this time it represents the voltage level when the first correction current sensing potential V _A2 is equal to or quite close to the upper limit of the load, and the first output level V _S1 can be fed back to the correction The tool 110 enables the calibration tool 110 to know the transition timing of the first output level V _S1 , and writes and stores the corresponding calibration data D _S in the first memory module 224A to become the calibration data 130A. As for the transition mode of the second output level V _S2 of the load comparison unit 212B, since it is similar to the transition mode of the first output level V _S1 of the load comparison unit 212A, it will not be repeated here.

In an embodiment of the present invention, the overcurrent protection chip 200 may further include two rework selectors 230A and 230B. The rework selector 230A is used to select the latest correction data stored in the first memory module 224A from the plurality of memory units A1 to AX of the first memory module 224A, and the rework selector 230B is used to select The latest correction data stored in the second memory module 224B is selected from the plurality of memory units B1 to BX of the memory module 224B. In other words, the rework selectors 230A and 230B will only select the latest recorded calibration data from the first memory module 224A and the second memory module 224B respectively, while other old calibration data will not be selected. After the rework selectors 230A and 230B respectively select the latest recorded calibration data, the overcurrent protection circuit 20 can generate the above two sets of overcurrent protection values 240A and 240B according to the selected calibration data. In addition, it is worth noting that the rework selectors 230A and 230B are respectively set in response to the first memory module 224A and the second memory module 224B having a plurality of memory units A1 to AX and B1 to BX. In other words, in other embodiments of the present invention, if the first memory module 224A and the second memory module 224B each have only one memory unit, the rework selectors 230A and 230B do not need to be provided.

In addition, although the current protection chip 200 in this embodiment is designed to provide two sets of over-current protection values 240A and 240B. However, the present invention is not limited thereto, and each overcurrent protection chip 200 can also be designed to provide three or more sets of overcurrent protection values. Wherein, each time a group of overcurrent protection values is added, it is only necessary to configure a load comparison unit and a memory module, and make the load machine 120 provide another current load potential to the additionally configured load comparison unit, and then complete the corresponding wiring (such as : switch control, signal transmission, etc.) can be. In detail, if in an embodiment of the present invention, the current protection chip is designed to provide three sets of current protection values, then the current protection chip can be additionally added in addition to the above-mentioned three input terminals P1 to P3 An input terminal is used to receive the third current load potential provided by the load machine 120 . In addition, the switching selection circuit 210 may further include another load comparison unit for comparing the correction data Ds with the above-mentioned third current load potential, and when the correction data Ds matches the above-mentioned third current load potential, the correction data Ds is It is stored in one memory unit of the above-mentioned additionally configured memory module. A single overcurrent protection chip can provide four or more sets of circuit settings for overcurrent protection values, and so on.

In an embodiment of the present invention, the overcurrent protection chip 200 may further include a slot comparison unit 220 and two selection switches SW ₁ and SW ₂ . The slot comparison unit 220 is mainly used for parallel connection with other overcurrent protection chips 200 to increase the number of power output groups that can be corrected by the power supply, which will be described below with reference to FIG. 4 . Please refer to FIG. 4 . FIG. 4 is a schematic diagram of a power supply overcurrent protection circuit 30 coupled to a calibration tool 110 and a load machine 120 according to another embodiment of the present invention. The overcurrent protection circuit 30 includes two overcurrent protection chips 200_1 and 200_2. The circuit structure of the overcurrent protection chips 200_1 and 200_2 is the same as that of the overcurrent protection chip 200 in FIG. 2 . Wherein, the overcurrent protection chip 200_1 is used to generate two sets of overcurrent protection values 240A and 240B according to the calibration data D _S , the first current load potential V _A1 and the second current load potential V _B1 , while the overcurrent protection chip 200_2 is used for generating two sets of overcurrent protection values 240A and 240B. Two sets of overcurrent protection values 240C and 240D are generated according to the calibration data D _S , the third current load potential V _C1 and the fourth current load potential V _D1 . Basically, the operation of the over-current protection chip 200_1 is the same as that of the over-current protection chip 200 in FIG. 2 . As for the overcurrent protection chip 200_2, its operation method is also similar, except that the input of the overcurrent protection chip 200_2 is the third current load potential V _C1 and the fourth current load potential V _D1 , and generates calibration data 130C and 130D and correspondingly outputs the other The overcurrent protection values of the two groups are 240C and 240D. In addition, the load comparison units 212A and 212B of the overcurrent protection chip 200_2 are coupled to the voltage input terminal Vcs through resistors R _C2 and R _D2 respectively. The load comparison unit 212A of the overcurrent protection chip 200_2 can adjust the third correction current sensing potential V _C2 according to the correction data D _S , and the load comparison unit 212B of the overcurrent protection chip 200_2 can adjust the fourth correction current sensing potential according to the correction data D _S V _D2 . Since the operation mode of the over-current protection chips 200_1 and 200_2 is similar to that of the over-current protection chip 200, so for the operation mode of the over-current protection chips 200_1 and 200_2, only the slot comparison unit 220 and the two selection switches will be described in the following description Parts of SW ₁ and SW ₂ will be described, and the operation methods of other components will not be repeated.

The overcurrent protection chips 200_1 and 200_2 will receive the slot comparison command S _COM and the slot positions S1 and S2, and compare the slot comparison command S _COM and the slot positions S1 and S2 to output enable signals E _N1 and S2 respectively. E _N2 , and determine the potentials of the enabling signals E _N1 and E _N2 . In one embodiment of the present invention, the states of multiple pins of the comparison unit 220 (for example: whether to be grounded or coupled to a specific voltage) of the overcurrent protection chips 200_1 and 200_2 can be set to respectively Set the slot positions S1 and S2 accordingly. In addition, when the slot-comparison command S _COM is consistent with the slot position S1 , the enabling signal E _N1 is at the first potential to turn on the selection switches SW ₁ and SW ₂ of the over-current protection chip 200_1 . When the slot position comparison command S _COM is inconsistent with the slot position S1 , the enable signal E _N1 is at the second potential to turn off the selection switches SW ₁ and SW ₂ of the overcurrent protection chip 200_1 . Similarly, when the slot-comparison command S _COM is consistent with the slot position S2 , the enable signal EN2 is at the first potential to turn on the selection switches SW ₁ and SW ₂ of the over-current protection chip _{200_2} . When the slot position comparison command S _COM is inconsistent with the slot position S2 , the enable signal EN2 is at the second potential to turn off the selection switches SW ₁ and SW ₂ of the overcurrent protection chip _{200_2} . Therefore, the selection switch SW1 _of the overcurrent protection chip _{200_1} controls the calibration tool 110 to switch the electrical connection between the selection circuit 210 and the first memory module 224A according to the enable signal EN1, and the selection switch SW1 of the overcurrent protection chip 200_1 The SW ₂ controls the electrical connection between the calibration tool 110 and the switch selection circuit 210 and the second memory module 224B according to the enable signal E _N1 . Similarly, the selection switch SW1 _of the overcurrent protection chip _{200_2} controls the electrical connection between the calibration tool 110 and the switching selection circuit 210 and the first memory module 224A of the overcurrent protection chip 200_2 according to the enable signal EN2, and The selection switch SW2 of the current protection chip 200_1 controls the electrical connection between the calibration tool 110 and the switching selection circuit 210 of the overcurrent protection chip 200_2 and the _second memory module 224B according to the enable signal E _N2 . Therefore, by connecting a plurality of overcurrent protection chips in series, the number of power output groups that can be corrected by the power supply can be expanded. In addition, although two overcurrent protection chips 200_1 and 200_2 are connected in series for illustration in FIG. 4 , the present invention is not limited thereto. In other words, the present invention can be further applied to a power supply with three or more overcurrent protection chips connected in series through the above method of comparing the slots with the command S _COM and the slot positions of a plurality of current protection chips. .

Please refer to FIG. 5 , which is a flow chart of calibrating the overcurrent protection chip 200 in FIG. 2 . In step S410 , the calibration target group is set by the calibration tool 110 to determine the current load potential that the load machine 120 subsequently outputs to the calibration target. In step S420 , the load potential of the corrected target current is given by the load machine 120 . In step S430, the group to be corrected is judged by switching the selection circuit 210 to determine which memory module among the memory modules 224A and 224B the subsequent corrected data D _S should be stored in. In step S440, the load comparison unit 212A or 212B performs calibration corresponding to the corrected group. In step S450, through the calibration tool 110, it is determined whether there are other groups to be corrected. If there are other groups to be calibrated, go back to step S410; otherwise, complete the calibration of the overcurrent protection chip 200 (step S460).

Please refer to FIG. 6 , which is a flow chart of calibrating the plurality of overcurrent protection chips 200_1 and 200_2 in FIG. 4 . In step S510 , multiple overcurrent protection chips are connected through the slot comparison unit 220 of each overcurrent protection chip. In step S520 , the calibration tool 110 sends a slot comparison command S _COM to the slot comparison unit 220 of each overcurrent protection chip. In step S530 , each slot comparison unit 220 compares the slot comparison command S _COM with the slot positions S1 and S2 . In step S540, each slot comparison unit 220 determines whether the slot comparison command S _COM matches the slot position S1 or S2. If they match, step S550 is executed to perform the calibration procedure as shown in FIG. 5 . On the contrary, if they do not match, go back to step S520.

Please refer to FIG. 7 . FIG. 7 is a flowchart of a power supply installed with the overcurrent protection chip 200 shown in FIG. 2 from calibration to delivery. In step S610 , the calibration specification is set by the calibration tool 110 . In step S620 , the calibration procedure as shown in FIG. 5 is started by the calibration tool 110 and the loading machine 120 . In step S630 , the corrected and determined corrected data 130A and 130B are respectively stored in a memory unit of the first memory module 224A and the second memory module 224B. In step S640, the newly recorded correction data is selected from the first memory module 224A and the second memory module 224B by the rework selectors 230A and 230B, respectively. In step S650, the power supply is tested according to the selected latest recorded calibration data. In step S660, it is determined whether the test result meets the specification. If the specification is met, then proceed to the shipping procedure of step S670. On the contrary, if the specification is not met, go back to step S610 to re-calibrate.

To sum up, through the over-current protection chip and the over-current protection circuit of the present invention, multiple groups of over-current protection settings can be conveniently set for the power supply. Furthermore, each set of correctable power outputs can be matched with a memory module containing multiple memory units, so that power supply manufacturers can easily recover power when they need to change the specification and design of the power supply after production The supplier completes the setting of the overcurrent correction of the new specification by updating the correction data stored in the memory module. In addition, multiple slot comparison units can be connected in series through the slot comparison unit, so that the number of correctable power output groups of the power supply can be easily expanded without additionally designing a new overcurrent protection chip, so it has extremely high flexibility in use.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.

Claims (9)

1. An overcurrent protection chip for a power supply, comprising: the first input terminal is used to receive calibration data; the second input terminal is used to receive the first current load potential; the third input terminal is used for receiving the second current load potential; The first memory module includes at least one memory unit, and each memory unit of the first memory module is used to record an overcurrent protection value; The second memory module includes at least one memory unit, and each memory unit of the second memory module is used to record an overcurrent protection value; and A switching selection circuit, coupled to the first input terminal, the second input terminal and the third input terminal, for comparing the calibration data with the first current load potential, and comparing the calibration data with the second current load Potential; wherein when the correction data matches the first current load potential, the correction data is stored in a memory unit of the first memory module; Wherein when the correction data matches the second current load potential, the correction data is stored in a memory unit of the second memory module. 2. The overcurrent protection chip as claimed in claim 1, further comprising: a fourth input terminal for receiving a third current load potential; and The third memory module includes at least one memory unit, and each memory unit of the third memory module is used to record an overcurrent protection value; Wherein the switching selection circuit is also coupled to the fourth input terminal, and is used for comparing the correction data and the third current load potential, and when the correction data is consistent with the third current load potential, the correction data is stored in a memory unit of the third memory module. 3. The overcurrent protection chip as claimed in claim 1, wherein the switching selection circuit comprises: a first load comparison unit, configured to adjust a first correction current induction potential of the first load comparison unit according to the correction data; a second load comparison unit, configured to adjust a second correction current induction potential of the second load comparison unit according to the correction data; a correction group selector, coupled to the output end of the first load comparison unit and the output end of the second load comparison unit; a first switch, coupled to the first input terminal, the correction group selector and the first memory module, for controlling the electrical connection between the first input terminal and the first memory module; and a second switch, coupled to the first input terminal, the correction group selector and the second memory module, for controlling the electrical connection between the second input terminal and the second memory module; Wherein when the first calibration current induction potential is equal to the first current load potential, the calibration group selector turns on the first switch, so that the calibration data is stored in a memory unit of the first memory module; Wherein when the second calibration current sensing potential is equal to the second current load potential, the calibration group selector turns on the second switch, so that the calibration data is stored in a memory unit of the second memory module. 4. The overcurrent protection chip as claimed in claim 1, wherein each of the first memory module and the second memory module comprises a plurality of memory cells, and the overcurrent protection chip further comprises: The first rework selector is used to select the latest correction data stored in the first memory module from the plurality of memory units of the first memory module; and The second rework selector is used for selecting the latest correction data stored in the second memory module from the plurality of memory units of the second memory module. 5. The overcurrent protection chip as claimed in claim 1, further comprising: The slot comparison unit is used to compare a slot comparison command and a slot position to output a enable signal; a first selection switch, used for controlling the electrical connection between the first input end, the switching selection circuit and the first memory module according to the enabling signal; and The second selection switch is used for controlling the electrical connection between the first input end, the switching selection circuit and the second memory module according to the enabling signal. 6. An overcurrent protection circuit of a power supply, comprising a plurality of overcurrent protection chips, wherein each overcurrent protection chip comprises: the first input terminal is used for receiving a correction data; the second input terminal is used to receive the first current load potential; The third input end is used for receiving a second current load potential; The first memory module includes at least one memory unit, and each memory unit of the first memory module is used to record an overcurrent protection value; The second memory module includes at least one memory unit, and each memory unit of the second memory module is used to record an overcurrent protection value; A switching selection circuit, coupled to the first input terminal, the second input terminal and the third input terminal, for comparing the calibration data with the first current load potential, and comparing the calibration data with the second current load potential, wherein when the corrected data coincides with the first current load potential, the corrected data is stored in a memory cell of the first memory module, and when the corrected data coincides with the second current load potential, the correction data is stored into a memory unit of the second memory module; The slot comparing unit is used for comparing the slot comparing command and the slot position, so as to output the enable signal and determine the potential of the enable signal; a first selection switch, used for controlling the electrical connection between the first input end, the switching selection circuit and the first memory module according to the enabling signal; and a second selection switch, used for controlling the electrical connection between the first input end, the switching selection circuit and the second memory module according to the enabling signal; The slot comparison units of the overcurrent protection chips are coupled to each other, and receive the slot comparison command and the slot position respectively. 7. The overcurrent protection circuit as claimed in claim 6, wherein each overcurrent protection chip further comprises: a fourth input terminal for receiving a third current load potential; and The third memory module includes at least one memory unit, and each memory unit of the third memory module is used to record an overcurrent protection value; Wherein the switching selection circuit is also coupled to the fourth input terminal, and is used for comparing the correction data and the third current load potential, and when the correction data is consistent with the third current load potential, the correction data is stored in a memory unit of the third memory module. 8. The overcurrent protection circuit as claimed in claim 6, wherein the switching selection circuit of each overcurrent protection chip comprises: a first load comparison unit, configured to adjust a first correction current induction potential of the first load comparison unit according to the correction data; a second load comparison unit, configured to adjust a second correction current induction potential of the second load comparison unit according to the correction data; a correction group selector, coupled to the output end of the first load comparison unit and the output end of the second load comparison unit; a first switch, coupled to the first input terminal, the correction group selector and the first memory module, for controlling the electrical connection between the first input terminal and the first memory module; and a second switch, coupled to the first input terminal, the correction group selector and the second memory module, for controlling the electrical connection between the second input terminal and the second memory module; Wherein when the first calibration current induction potential is equal to the first current load potential, the calibration group selector turns on the first switch, so that the calibration data is stored in a memory unit of the first memory module; Wherein when the second calibration current sensing potential is equal to the second current load potential, the calibration group selector turns on the second switch, so that the calibration data is stored in a memory unit of the second memory module. 9. The overcurrent protection circuit as claimed in claim 6, wherein the first memory module and the second memory module of each overcurrent protection chip each comprise a plurality of memory cells, and each overcurrent protection chip further comprises: The first rework selector is used to select the latest correction data stored in the first memory module from the plurality of memory units of the first memory module; and The second rework selector is used for selecting the latest correction data stored in the second memory module from the plurality of memory units of the second memory module.