Power supply detection circuit and detection method thereof

Abstract

The invention provides a power supply detection circuit and a detection method thereof, the power supply detection circuit comprises a sensing circuit and a signal generation circuit, a correction circuit is arranged in the signal generation circuit, the sensing circuit senses an output power supply signal of a power supply, thereby obtaining sensing impedance, and the correction circuit is connected with the signal generation circuit. Therefore, a corresponding power supply sensing signal is generated according to the sensing impedance and the output power supply signal, so that the signal generation circuit generates a proportional power supply signal, and the correction circuit generates a correction signal according to the proportional power supply signal so as to drive the signal generation circuit to perform feedback control according to the correction signal and generate the proportional power supply signal. Therefore, the proportional power supply signal corresponds to a load condition and is applied to providing an output power supply signal with reduced errors.

Description

Technical Field

[0001] The present invention relates to a detection circuit and a detection method thereof, and in particular to a power supply detection circuit and a detection method thereof. Background Art

[0002] In recent years, with the advancement of technology, consumer electronic devices with different application functions have gradually been developed, such as smart phones, laptops, smart networked TVs, etc. These consumer electronic devices with different functions not only meet the different life needs of the general public, but also integrate into the daily life of the general public, thereby providing convenience in life for the general public.

[0003] These consumer electronic devices with different functions include various corresponding electronic components based on their own functions, such as: processing units, data storage components, memory components, display components, etc., and the power supply voltage required by each electronic component is different. Therefore, when the consumer electronic device needs an external power supply, it cannot be directly connected to the AC power supply (mains power) provided by the current power supply system. In addition, general electronic components are driven by DC power. In order to provide corresponding power for each electronic component so that the electronic component can operate normally, the power supply plays an important intermediate role. These consumer electronic devices with different functions need to use the power supply to convert the AC power supply, such as the general mains power, into an appropriate DC power supply for the consumer electronic device to use, such as: supplying the output power of the rated voltage.

[0004] The disadvantages of the conventional power supply are as follows:

[0005] If the output power is a single voltage (eg 12V) output power and a current sensing resistor is used to sense the output power, the proportional current signal corresponding to the rated load of the power supply has the sum of the errors of each resistor.

[0006] If the output voltage is a multi-voltage (e.g. 12V / 5V / 3.3V) output power supply, and the output power is detected by using a current detection resistor, then the proportional current signal corresponding to the rated load of the power supply has not only the sum of the errors of each resistor, but also the error in the normalized control of the output power.

[0007] Therefore, how to automatically detect the output power of the power supply and automatically correct the error under the condition of supplying rated power is a problem that those skilled in the art want to solve. Summary of the invention

[0008] One purpose of the present invention is to provide a power detection circuit and a detection method thereof, wherein a correction circuit generates a corresponding correction signal according to a proportional power signal generated by a signal generating circuit, and feeds back the correction signal to the signal generating circuit to generate the proportional power signal, thereby automatically detecting the output power size of the power supply and automatically adjusting the proportional power signal corresponding to the power supply to be applied to the output power control of the power supply.

[0009] In order to achieve the above main purpose, the present invention provides a power detection circuit, which includes a sensing circuit and a signal generating circuit, wherein the sensing circuit is provided with a plurality of impedance components, and a correction circuit is provided in the signal generating circuit, wherein the sensing circuit is coupled to a power supply, so that the sensing circuit senses an output power signal of the power supply, and obtains a sensing impedance according to the output power signal and the impedance components, thereby allowing the sensing circuit to generate a power sensing signal according to the sensing impedance and the output power signal, and the signal generating circuit is coupled to the sensing circuit, and generates a proportional power signal according to the power sensing signal, and the signal generating circuit simultaneously generates a correction signal according to the proportional power signal through the correction circuit, so as to drive the signal generating circuit to perform feedback control according to the correction signal and generate the proportional power signal. Here, the proportional power signal can be used to control an output power of the power supply, thereby avoiding the sum of the errors of each resistor and the error in the normalized control of the output power.

[0010] In one embodiment of the present invention, the sensing circuit comprises:

[0011] An amplifier circuit is coupled to the load sensing component and is provided with the impedance components. The load sensing component senses the output power signal to obtain a load sensing signal. The amplifier circuit obtains the sensing impedance according to the load sensing signal and the impedance components. The amplifier circuit amplifies the load sensing signal according to the sensing impedance to generate a gain signal. And a first conversion circuit generates the power sensing signal according to the gain signal.

[0012] In one embodiment of the present invention, the sensing circuit further includes a summing circuit coupled to the voltage conversion circuit and summing the power sensing signal.

[0013] In one embodiment of the present invention, the amplifier circuit includes: a first amplifier coupled to the load sensing component and amplifying the load sensing signal;

[0014] An impedance selection circuit is coupled to the first amplifier and is provided with the impedance components. The impedance selection circuit obtains the sensing impedance according to the load sensing signal and the impedance components; and

[0015] The second amplifier is coupled to the impedance selection circuit and generates the gain signal according to the sensing impedance and the load detection signal.

[0016] In one embodiment of the present invention, the first conversion circuit has a signal conversion ratio, and the first conversion circuit further generates the mirror current signal according to the signal conversion ratio.

[0017] In one embodiment of the present invention, the signal generating circuit further comprises:

[0018] an input circuit coupled to the sensing circuit and generating an input signal according to the power sensing signal; and

[0019] A second conversion circuit is coupled to the input circuit and generates the proportional power signal according to the input signal;

[0020] The correction circuit feeds back the correction signal to the second conversion circuit to drive the second conversion circuit to generate the proportional power signal according to the correction signal.

[0021] In one embodiment of the present invention, the signal generating circuit further comprises:

[0022] The trigger circuit is coupled to the correction circuit and generates a trigger signal to the correction circuit according to the start signal.

[0023] In one embodiment of the present invention, the start signal corresponds to the output power signal or the power sensing signal or the proportional power signal.

[0024] The present invention further provides a detection method of a power detection circuit, which first senses an output power signal of a power supply through a sensing circuit and obtains a sensing impedance according to the output power signal and a plurality of impedance components, thereby generating a power sensing signal, and then generates a proportional power signal according to the power sensing signal through a signal generating circuit, and generates a correction signal according to the proportional power signal through a correction circuit, so as to be fed back to the signal generating circuit and used to generate the proportional power signal. Here, the proportional power signal can be used to control an output power of the power supply, thereby avoiding the error in the sum of the resistance errors and the output power normalization control.

[0025] In one embodiment of the present invention, the step of sensing an output power signal of a power supply by a sensing circuit and selecting a sensing impedance according to the output power signal and a plurality of impedance components to generate a power sensing signal includes:

[0026] The load sensing component senses the output power signal to obtain a load sensing signal;

[0027] The sensing impedance is selected by an amplifier circuit according to the load sensing signal and the impedance components to amplify the load sensing signal according to the sensing impedance to generate a gain signal; and the power sensing signal is generated by a first conversion circuit according to the gain signal.

[0028] In one embodiment of the present invention, the step of selecting the sensing impedance according to the load sensing signal and the impedance components through an amplifier circuit to amplify the load sensing signal according to the sensing impedance to generate a gain signal includes:

[0029] amplifying the load sensing signal by a first amplifier;

[0030] Obtaining the sensing impedance according to the load sensing signal and a plurality of impedance components through an impedance selection circuit; and

[0031] The gain signal is generated by a second amplifier according to the sensing impedance and the load sensing signal.

[0032] In one embodiment of the present invention, in the step of generating the power sensing signal according to the gain signal by the first conversion circuit, the first conversion circuit further generates the power sensing signal according to the signal conversion ratio. In one embodiment of the present invention, in the step of generating the proportional power signal according to the sensing signal by the signal generating circuit, it includes:

[0033] generating an input signal according to the sensing signal through an input circuit; and

[0034] The proportional power signal is generated according to the input signal through a second conversion circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 : It is a block diagram of a power detection circuit according to a first embodiment of the present invention;

[0036] Figure 2 : It is a circuit diagram of a power detection circuit according to a second embodiment of the present invention;

[0037] Figure 3 :It is a flow chart of a testing method of a power detection circuit according to a second embodiment of the present invention;

[0038] Figure 4 :It is a flow chart of a testing method of a power detection circuit according to a third embodiment of the present invention;

[0039] Figure 5 :It is a flow chart of a testing method of a power detection circuit according to a fourth embodiment of the present invention;

[0040] Figure 6:It is a flow chart of a testing method of a power detection circuit according to a fifth embodiment of the present invention;

[0041] Figure 7 : It is a circuit diagram of a power detection circuit according to a sixth embodiment of the present invention.

[0042] Reference numerals:

[0043] 10 Power detection circuit

[0044] 1021 first load sensing component

[0045] 1022 second load sensing component

[0046] 1023 third load sensing component

[0047] 102nth load sensing assembly

[0048] 12 Sensing circuit

[0049] 122 amplifier circuit

[0050] 12221~1222nFirst amplifier

[0051] 12231~1223n sensing amplified signal

[0052] 12241~1224n impedance selection circuit

[0053] 12261~1226n Second amplifier

[0054] 1241~124n first conversion circuit

[0055] 126 summation circuit

[0056] 14Signal generating circuit

[0057] 142 Correction Circuit

[0058] 1422 Calibration Signal

[0059] 144 Input Circuit

[0060] 1442 Input signal

[0061] 146 Second conversion circuit

[0062] 1462 output signal

[0063] 148 Trigger Circuit

[0064] 1482 trigger signal

[0065] G1~Gn gain signal

[0066] I_PSU% proportional power signal

[0067] Iout1 first output current signal

[0068] Iout2 second output current signal

[0069] Iout3 third output current signal

[0070] R4 resistor

[0071] R11 first resistor

[0072] R12 first resistor device

[0073] R121~R127 resistor

[0074] R21 second resistor

[0075] R22 second resistor device

[0076] R221~R227 resistor

[0077] R31 third resistor

[0078] R32 The third resistor device

[0079] R321~R327 resistor

[0080] RS1 first sensing resistor

[0081] RS2 Second sensing resistor

[0082] RS3 third sensing resistor

[0083] PSON start signal

[0084] SEN1~SENn power sensing signal

[0085] SENS total sensing signal

[0086] SR1~SRn sensing impedance

[0087] SW1 first switching circuit

[0088] SW2 second switching circuit

[0089] SW3 third switching circuit

[0090] V1~Vn output power signal

[0091] VL1~VLn load sensing signal

[0092] VCC drive power supply

[0093] α1~αn gain coefficient

[0094] γ1~γn first conversion coefficient

[0095] β Second conversion coefficient

[0096] γ1:1~γn:1 signal conversion ratio DETAILED DESCRIPTION

[0097] In order to enable you to have a better understanding and recognition of the features and effects of the present invention, we hereby provide a preferred embodiment and a detailed description, as follows:

[0098] Certain words are used in the specification and claims to refer to specific components. However, those with ordinary knowledge in the technical field of the present invention should understand that manufacturers may use different terms to refer to the same component. Moreover, the specification and claims do not use the difference in name as a way to distinguish components, but use the overall technical difference of the components as the criterion for distinction. The word "including" mentioned throughout the specification and claims is an open term and should be interpreted as "including but not limited to". Furthermore, the word "coupled" here includes any direct and indirect connection means. Therefore, if the text describes a first device coupled to a second device, it means that the first device can be directly connected to the second device, or can be indirectly connected to the second device through other devices or other connection means.

[0099] When the conventional power supply supplies a single voltage power supply, the proportional current signal corresponding to the rated load has the sum of the errors of each resistor. In addition, when the conventional power supply supplies multiple voltage power supplies, the proportional current signal corresponding to the rated load has not only the sum of the errors of each resistor, but also the error in the normalized control of the output power.

[0100] The present invention provides a power detection circuit and a detection method thereof, wherein a correction circuit generates a power sensing signal to a signal generating circuit based on sensing an output power signal of a power supply, and a correction signal is fed back to the signal generating circuit to generate a proportional power signal, thereby automatically detecting the output power size of the power supply and automatically adjusting the proportional power signal corresponding to the power supply to be applied to the output power control of the power supply.

[0101] Hereinafter, the present invention will be described in detail by illustrating various embodiments of the present invention through the accompanying drawings. However, the concept of the present invention may be embodied in many different forms and should not be construed as being limited to the exemplary embodiments described herein.

[0102] See also Figure 1, which is a block diagram of a power detection circuit of the first embodiment of the present invention. As shown in the figure, the first embodiment of the present invention discloses a power detection circuit 10 used in the present invention, which includes a sensing circuit 12 and a signal generating circuit 14. The sensing circuit 12 is coupled to the signal generating circuit 14. The sensing circuit 12 is coupled to a power supply (not shown) to detect at least one output power signal V1-Vn of the power supply, thereby generating corresponding power sensing signals SEN1-SENn, and n is greater than or equal to 1. The signal generating circuit 14 generates a proportional power signal I_PSU% according to the power sensing signals SEN1-SENn, and a correction circuit 142 is provided in the signal generating circuit 14. The correction circuit 142 generates a correction signal 1422 through the proportional power signal I_PSU%, which is fed back to the signal generating circuit 14 to generate the proportional power signal I_PSU%, which is used to control an output power of the power supply, that is, to control the output power of the output power signals V1-Vn. Details are as follows.

[0103] See also Figure 1 The sensing circuit 12 includes an amplifier circuit 122 and a plurality of first conversion circuits 1241-124n. The amplifier circuit 122 includes at least one first amplifier 12221-1222n, at least one impedance selection circuit 12241-1224n and at least one second amplifier 12261-1226n. The first amplifiers 12221-1222n are coupled to the load sensing components 1021-102n. The impedance selection circuits 12241-1224n are coupled to the first amplifiers 12221-1222n. The second amplifiers 12261-1226n are coupled to the impedance selection circuits 12241-1224n. The first conversion circuits 1241-124n are coupled to the second amplifiers 12261-1226n. n is greater than or equal to 1.

[0104] Continue with the above and refer to Figure 2 , Figure 2 1 is a circuit diagram of a power detection circuit of a second embodiment of the present invention. The load sensing components 1021-102n are coupled to the power supply, and thus are coupled to at least one output power signal V1-Vn of the power supply, so that the load sensing components 1021-102n generate corresponding load sensing signals VL1-VLn, where n is greater than or equal to 1. Therefore, the load sensing signals VL1-VLn are input to the first amplifiers 12221-1222n, and after amplification, sensing amplified signals 12231-1223n are generated, and are input to the impedance selection circuits 12241-1224n. The impedance selection circuits 12241-1224n select the sensing amplified signals 12231-1223n corresponding to the load sensing signals VL1-VLn and a plurality of impedance components (for example, such as Figure 2The first resistor device R12 shown has a plurality of resistors R121-R127) to obtain corresponding sensing impedances SR1-SRn, and the sensing impedances SR1-SRn correspond to the gain coefficients α1-αn of the gain signals G1-Gn, and then the second amplifiers 12261-1226n generate the gain signals G1-Gn according to the sensing impedances SR1-SRn and the load detection signals VL1-VLn. The first conversion circuits 1241-124n generate the power sensing signals SEN1-SENn according to the gain signals G1-Gn, wherein the first conversion circuits 1241-124n respectively have a first conversion coefficient γ1-γn, so the first conversion circuits 1241-124n further convert the gain signals G1-Gn into the power sensing signals SEN1-SENn according to the signal conversion ratios γ1:1-γn:1.

[0105] That is to say, the present invention obtains sensing impedances SR1-SRn according to the load sensing signals VL1-VLn and the impedance components through the amplifier circuit 122, and the amplifier circuit 122 amplifies the load sensing signals VL1-VLn according to the sensing impedances SR1-SRn to generate gain signals G1-Gn, and then the first conversion circuits 1241-124n generate power sensing signals SEN1-SENn according to the gain signals G1-Gn. This is equivalent to the sensing circuit 12 detecting the output power signals V1-Vn, and obtaining the sensing impedances SR1-SRn according to the output power signals V1-Vn and the impedance components, and the sensing circuit 12 generates the power sensing signals SEN1-SENn according to the sensing impedances SR1-SRn and the output power signals V1-Vn.

[0106] In addition, the sensing circuit 12 of the present invention further includes a summing circuit 126, which is coupled to the first conversion circuits 1241~124n, integrates the power sensing signals SEN1~SENn, and generates a summing sensing signal SENS. Therefore, when n=1, the summing sensing signal SENS is equivalent to a power sensing signal of the power sensing signals SEN1~SENn, that is, the signal generating circuit 14 can receive a single power sensing signal or multiple power sensing signals to generate a corresponding proportional power signal I_PSU%.

[0107] Continuing from above, see Figure 1 Also see Figure 2The signal generating circuit 14 further includes an input circuit 144 and a second conversion circuit 146. The input circuit 144 is coupled to the sensing circuit 12, that is, coupled to the first conversion circuits 1241~124n. This embodiment uses the input circuit 144 coupled to the first conversion circuits 1241~124n via the summing circuit 126 as an example. Therefore, this embodiment uses the input circuit 144 receiving the summed sensing signal SENS as an example, but the present invention is not limited to this. The input circuit 144 can be directly coupled to the first conversion circuits 1241~124n, that is, the input circuit 144 is equivalent to the summing circuit 126, thereby integrating and receiving the power sensing signals SEN1~SENn to generate the corresponding input signal 1442. Among them, the input circuit 144 of this embodiment is an output terminal of an amplifier coupled to the gate of a transistor, and coupled to a negative input terminal of the amplifier through a resistor coupled to the source of the transistor, a positive input terminal of the amplifier is coupled to the sensing circuit 12, and the drain of the transistor is coupled to the second conversion circuit 146.

[0108] Continuing with the above, the second conversion circuit 146 is coupled to the input circuit 144, thereby receiving the input signal 1442 and generating a corresponding output signal 1462 based on the input signal 1442. That is, the output signal 1462 of the second conversion circuit 146 of this embodiment is the proportional power signal I_PSU% of the present invention. Thus, the proportional power signal I_PSU% is applied to control the output power of the power supply, that is, to control the output power of the output power signals V1~Vn. Furthermore, the present invention further generates a correction signal 1422 according to the proportional power signal I_PSU% through the correction circuit 142, that is, generates a corresponding correction signal 1422 according to the output signal 1462, so as to feedback the correction signal 1422 to the second conversion circuit 146, thereby feedback controlling the second conversion circuit 146, thereby driving the second conversion circuit 146 to feedback control the output signal 1462, thereby reducing the sum of the resistance errors of the proportional current signal I_PSU% corresponding to the rated load under the single voltage output power signal V1~Vn, and at the same time, under the multi-voltage output power signal V1~Vn, the error in the normalized control of the output power is further reduced.

[0109] In addition, the correction circuit 142 of the present invention can further provide a trigger signal 1482 to the correction circuit 142 by a trigger circuit 148, so as to enable the correction circuit 142 to generate a corresponding correction signal 1422 according to the output signal 1462 to feed back to the second conversion circuit 146, wherein the trigger circuit 148 is enabled according to a start signal PSON to generate the trigger signal 1482 to the correction circuit 142, and the start signal PSON is the corresponding output power signal V1~Vn or the power sensing signal SEN1~SENn or the proportional power signal I_PSU%.

[0110] Please read further Figure 2 As shown in the figure, this embodiment is based on Figure 2 The circuit diagram further illustrates that in this embodiment, the first load sensing component 1021 includes a first sensing resistor RS1 and a first resistor R11 as examples, and the impedance selection circuit 12241 includes a first resistor device R12 and a switching circuit SW1 as examples, wherein the first resistor device R12 includes the resistors R121-127, and the first sensing resistor RS1 is much smaller than the first resistor R11. For example, the first sensing resistor RS1 is 1 milliohm (mΩ). The first sensing resistor RS1 is used to sense the first output power signal V1. In this embodiment, it is used to sense The first output power signal V1 is passed through the first output current signal Iout1 generated by the first sensing resistor RS1, thereby obtaining the load sensing signal VL1, and the corresponding load sensing signal VL1 is amplified by the first amplifier 12221 to generate a sensing amplified signal 12231, and then the impedance selection circuit 12241 switches the first resistor device R12 through the switching circuit SW1 according to the sensing amplified signal 12231 corresponding to the load sensing signal VL1, thereby forming a corresponding sensing impedance SR1, which is a gain coefficient α1 corresponding to the load sensing signal VL1.

[0111] That is, the load sensing signal VL1 is obtained through the first load sensing component 1021, and then amplified by the first amplifier 12221, so that the impedance selection circuit 12241 switches the first resistor device R12 through the switching circuit SW1 according to the load sensing signal VL1, thereby forming a corresponding sensing impedance SR1, thereby obtaining a corresponding gain coefficient α1. Continuing from the above, the second amplifier 12261 generates a corresponding gain signal G1 to the first conversion circuit 1241 according to the sensing impedance SR1 and the load sensing signal VL1. The first conversion circuit 1241 generates a power sensing signal SEN1 according to the signal conversion ratio γ1:1 obtained by its first conversion coefficient γ1. This embodiment further sets a summing circuit 126, so that the power sensing signal SEN1 will be first transmitted to the summing circuit 126, thereby forming a node signal TP, but the present invention is not limited to this, and can be directly transmitted to the signal generating circuit 14. In this embodiment, the first conversion circuit 1241 is exemplified by a current mirror circuit, so the gain signal G1 may be a current signal, and the power sensing signal SEN1 generated by the first conversion circuit 1241 may also be a current signal.

[0112] See also Figure 2In this embodiment, a second circuit is further used to sense a second output power signal V2. The second load sensing component 1022 includes a second sensing resistor RS2 and a second resistor R12. The second load sensing component 1022 senses the second output power signal V2, and the second sensing resistor RS2 of the second load sensing component 1022 senses a second output current signal Iout2 of the second output power signal V2 to obtain a load sensing signal VL2. The corresponding load sensing signal VL2 is amplified by the first amplifier 12222 to generate a sensing amplified signal 12232. The impedance selection circuit 12242 switches the resistors R221~R227 of the second resistor device R22 through the switching circuit SW2 according to the sensing amplification signal 12232 to obtain the sensing impedance SR2, that is, to obtain the gain coefficient α2 of the corresponding load sensing signal VL2, and then generates the corresponding gain signal G2 according to the sensing impedance SR2 and the load sensing signal VL2 through the second amplifier 12262, so that the first conversion circuit 1242 generates the corresponding power supply sensing signal SEN2 according to the signal conversion ratio γ2:1 obtained by the gain signal G2 and its first conversion coefficient γ2.

[0113] Continuing from the above, after receiving the power sensing signals SEN1 and SEN2 (that is, the total sensing signal SENS), the input circuit 144 of the signal generating circuit 14 will generate a corresponding input signal 1442 to the second conversion circuit 146, so that the second conversion circuit 146 generates a corresponding output signal 1462 according to the input signal 1442, that is, generates a corresponding proportional power signal I_PSU%, wherein the second conversion circuit 146 converts the input signal 1442 into an output signal 1462 according to a second conversion coefficient β, which is the proportional power signal I_PSU%. The second conversion circuit 146 of this embodiment is a current mirror circuit, so the input signal 1442 and the proportional power signal I_PSU% of this embodiment are current signals, but the present invention is not limited to this, and can be converted into voltage signals by adding capacitors or other passive components before and after. The correction circuit 142 generates a corresponding correction signal 1422 according to the output signal 1462 of the second conversion circuit 146 and feeds it back to the second conversion circuit 146 to feedback control the second conversion circuit 146 to generate its output signal 1462, that is, feedback control the proportional power signal I_PSU%.

[0114] In addition, the present embodiment further provides a trigger circuit 148, which generates a corresponding trigger signal 1482 to the correction circuit 142 according to the start signal PSON, so as to drive the correction circuit 142 to generate a corresponding correction signal 1422 according to the output signal 1462 of the second conversion circuit 146 and feed it back to the second conversion circuit 146, thereby generating a corresponding proportional power signal I_PSU%. In the present embodiment, the first output power signal V1 and the second output power signal V2 are at a single voltage, so under the single voltage output power signals V1 and V2, the sum of the resistor errors of the proportional current signal I_PSU% corresponding to the rated load is reduced.

[0115] For example: the first sensing resistor RS1 and the second sensing resistor RS2 are both 1mΩ, and the gain coefficients α1 and α2 corresponding to the sensing impedance SR1 and the sensing impedance SR2 are 60, the signal conversion ratios γ1:1 and γ2:1 are both 1:1, and the resistor R4 of the input circuit 144 is 1kΩ, and the sum of the first output current signal Iout1 and the second output current signal Iout2 is 100 amperes (A), and the total output power of the power supply is 1000 watts (W), so the voltage level of the node signal TP is 100A*1mΩ*60, that is, 6V. The current value corresponding to the full-load output proportional power signal I_PSU% is 1mA, and the current value corresponding to the proportional power signal I_PSU% is β*TP / R4, that is, 1mA=β*6V / 1kΩ, and β is 0.16667. If the first output current signal Iout1 and the second output current signal Iout2 are 50A and 30A respectively, the voltage level of the node signal TP is 4.8V, and the proportional power signal I_PSU% is 0.16667*4.8V / 1k, which is 0.8mA, equivalent to 80% output power.

[0116] Please read further Figure 3 , which is a flow chart of a testing method of a power detection circuit according to a second embodiment of the present invention, the steps of which include:

[0117] Step S10: sensing the output power signal of the power supply through the sensing circuit and obtaining the sensing impedance according to the output power signal to generate a power sensing signal;

[0118] Step S20: generating a proportional power signal according to the power sensing signal through a signal generating circuit; and

[0119] Step S30: Generate a correction signal according to the proportional power signal through the correction circuit to drive the signal generation circuit to feedback control and generate the proportional power signal.

[0120] In step S10, please refer to FIG. 1 and Figure 2The output power signals V1-Vn of the power supply are sensed by the sensing circuit 12, and the corresponding sensing impedances SR1-SRn are obtained according to the sensing results, thereby generating corresponding power sensing signals SEN1-SENn according to the sensing results and the corresponding sensing impedances SR1-SRn, where n is greater than or equal to 1.

[0121] In step S20, please refer to Figure 1 and Figure 2 The signal generating circuit 14 further generates a proportional power signal I_PSU% according to the power sensing signals SEN1~SENn generated in step S10. In particular, in the subsequent step S30, the correction circuit 142 generates a corresponding correction signal 1422 according to the proportional power signal I_PSU%, and feeds it back to the signal generating circuit 14, so that the signal generating circuit 14 generates a corresponding proportional power signal I_PSU%. In this way, under the output power signal V1~Vn of a single voltage, the sum of the resistance errors of the proportional current signal I_PSU% corresponding to the rated load is reduced. At the same time, under the output power signal V1~Vn of multiple voltages, the error in the normalized control of the output power is further reduced.

[0122] Further reading Figure 4 , which is a flow chart of a test method of a power detection circuit according to a third embodiment of the present invention. Step S10 is further expanded into the following steps:

[0123] Step S102: Sense the output power signal through the load sensing component to obtain a load sensing signal;

[0124] Step S104: amplifying the sensing signal according to the selected impedance value through an amplifier circuit to generate a gain signal; and

[0125] Step S106: Generate a power sensing signal according to the gain signal through the first conversion circuit.

[0126] In step S102, please refer to Figure 1 and Figure 2 The load sensing components 1021-102n coupled to the sensing circuit 12 sense the power output signals V1-Vn of the power supply and generate corresponding load sensing signals VL1-VLn to be input to the amplifier circuit 122, where n is greater than or equal to 1.

[0127] In step S104, please refer to Figure 1 and Figure 2, the amplifier circuit 122 obtains the corresponding sensing impedances SR1-SRn according to the load sensing signals VL1-VLn, which is equivalent to obtaining the corresponding gain coefficients α1-αn. Thus, the amplifier circuit 122 generates corresponding gain signals G1-Gn according to the sensing impedances SR1-SRn and the load sensing signals VL1-VLn, where n is greater than or equal to 1.

[0128] In step S106, please refer to Figure 1 and Figure 2 , through the first conversion circuits 1241 ˜ 124n, corresponding power sensing signals SEN1 ˜SENn are generated according to the gain signals G1 ˜Gn, thereby being used to generate corresponding proportional current signals I_PSU% in step S20 and step S30.

[0129] Further reading Figure 5 , which is a flow chart of a method for testing a power detection circuit according to a fourth embodiment of the present invention. Step S104 is further expanded into the following steps:

[0130] Step S1042: amplifying the load sensing signal through the first amplifier;

[0131] Step S1044: obtaining a sensing impedance according to the load sensing signal and the impedance component through the impedance selection circuit; and

[0132] Step S1046: Generate a gain signal through the second amplifier according to the sensed impedance and the load sensed signal. In step S1042, please refer to Figure 1 and Figure 2 The first amplifiers 12221 - 1222n are coupled to the load sensing components 1021 - 102n, thereby receiving the load sensing signals VL1 - VLn, amplifying the load sensing signals VL1 - VLn and transmitting them to the impedance selection circuits 12241 - 1224n, where n is greater than or equal to 1.

[0133] In step S1044, please refer to Figure 1 and Figure 2 The impedance selection circuits 12241 - 1224n obtain corresponding sensing impedances SR1 - SRn from the impedance components according to the load sensing signals VL1 - VLn, that is, obtain corresponding gain coefficients α1 - αn, where n is greater than or equal to 1.

[0134] In step S1046, please refer to Figure 1 and Figure 2The second amplifiers 12261~1226n obtain the load sensing signals VL1~VLn amplified by step S1042 and the sensing impedances SR1~SRn obtained in step S1044, that is, obtain the corresponding load sensing signals VL1~VLn and gain coefficients α1~αn, and thus generate corresponding gain signals G1~Gn to the first conversion circuits 1241~124n according to the load sensing signals VL1~VLn and the gain coefficients α1~αn, where n is greater than or equal to 1.

[0135] Further reading Figure 6 , which is a flow chart of a method for testing a power detection circuit according to a fifth embodiment of the present invention. Step S20 is further expanded into the following steps:

[0136] Step S202: generating an input signal according to the power sensing signal through an input circuit; and

[0137] Step S204: Generate a proportional power signal according to the input signal through the second conversion circuit.

[0138] In step S202, please refer to Figure 1 and Figure 2 The power sensing signals SEN1 -SENn generated in step S10 or step S106 are transmitted to the input circuit 144 , and the output circuit 144 generates a corresponding input signal 1442 to the second conversion circuit 146 according to the power sensing signals SEN1 -SENn.

[0139] In step S204, please refer to Figure 1 and Figure 2 When the second conversion circuit 146 receives the input signal 1442, it will convert the input signal 1442 into a corresponding output signal 1462, that is, the proportional power signal I_PSU%, according to the corresponding second conversion coefficient β.

[0140] In addition to detecting the first output power signal V1 and the second output power signal V2 of a single voltage as described in the above embodiment, it is also possible to Figure 7 As shown, it detects a first power output signal V1, a second power output signal V2 and a third power output signal V3 of multiple voltages.

[0141] See also Figure 7, which is a circuit diagram of the power detection circuit of the seventh embodiment of the present invention. As shown in the figure, the power detection circuit 10 of the present invention can further detect the first power output signal V1, the second power output signal V2 and the third output power signal V3 of multiple voltages, wherein the sensing circuit 12 of this embodiment further adds a set of circuits for detecting the third output power signal V3. The circuit components for detecting the first output power signal V1 and the second output power signal V2 are the same as those in Figure 2 , so no further description is given. This embodiment is similar to Figure 2 In addition to the additional circuit for detecting the third output power signal V3, the signal conversion ratio of each circuit group of the sensing circuit 12 is different from that of other circuit groups, for example: γ1:1, γ2:1, γ3:1 are 1:1, 12 / 5:1, 12 / 3.3:1, that is, 1:1, 12:5, 12:3.3. This embodiment uses a 1:1 12V power supply as an example of a maximum output voltage power supply, but the present invention is not limited to this, and can be based on the maximum voltage level as a reference to convert into each signal conversion ratio.

[0142] See also Figure 7 In this embodiment, a third circuit is further used to sense the third output power signal V3. The third load sensing component 1023 includes a third sensing resistor RS3 and a third resistor R13. That is, the third load sensing component 1023 senses the third output power signal V3, and the third sensing resistor RS3 of the third load sensing component 1023 senses a third output current signal Iout3 of the third output power signal V3, thereby obtaining a load sensing signal VL3, thereby amplifying the corresponding load sensing signal VL3 through the first amplifier 12223 to generate a corresponding sensing amplified signal. 12233 to the impedance selection circuit 12243, and the resistors R321-R327 of the second resistor device R32 are switched through the impedance selection circuit 12243 through the switching circuit SW3 to obtain the sensing impedance SR3, which is the gain coefficient α3 corresponding to the load sensing signal VL3, and then the second amplifier 12263 generates the corresponding gain signal G3 according to the sensing impedance SR3 and the load sensing signal VL3, so that the first conversion circuit 1243 generates the corresponding power sensing signal SEN3 according to the signal conversion ratio γ3:1 obtained by the gain signal G3 and its first conversion coefficient γ3. That is to say, the signal generating circuit 14 of this embodiment generates the corresponding proportional power signal I_PSU% according to the sum of the power sensing signals SEN1, SEN2, and SEN3, and is further implemented in the case of a multi-voltage power output signal.

[0143] For example, the first sensing resistor RS1 and the second sensing resistor RS2 are both 1 mΩ, and the gain coefficient α1 corresponding to the sensing impedance SR1 and the sensing impedance SR2 is 40, the gain coefficients α2 and α3 are 50, the signal conversion ratios γ1:1, γ2:1 and γ3:1 are 1:1, 0.4167:1 and 0.275:1, and the resistor R4 of the input circuit 144 is 1 kΩ, and the first output current signal Iout1 is 100 A, the second output current signal Iout2 and the third output current signal Iout3 are 40 A and 20 A, and the total output power of the power supply is 1466 watts (W). Therefore, the voltage level of the node signal TP is 100A*1mΩ*40+40A*1mΩ*0.4167*50+20A*1mΩ*0.275*50, and the result is 5.1084V. The current value corresponding to the full-load output proportional power signal I_PSU% is 1mA, and the current value corresponding to the proportional power signal I_PSU% is β*TP / R4, that is, 1mA=β*5.1084V / 1kΩ, it can be seen that β is 0.1957. If the first output current signal Iout1, the second output current signal Iout2 and the third output current signal Iout3 are 50A, 20A, and 10A respectively, the voltage level of the node signal TP is 4.5542V, and the proportional power signal I_PSU% is 0.16667*4.5542V / 1k, which is 0.89mA, equivalent to 89% output power. It can be seen from the above embodiments that the present invention can be applied to the case of a single voltage or multi-voltage power output signal, and detect the corresponding proportional power signal I_PSU%, thereby providing correction through the correction circuit 142 so that the output power of the power supply can be normalized power, for example: greater than 80% output power, that is, the so-called power supply maintaining 80PLUS certification, which is a power supply with better quality in the industry, thereby avoiding the performance of the power supply from being reduced, and the power detection circuit of the present invention automatically detects the output power size of the power supply and automatically adjusts the proportional power signal corresponding to the power supply, so as to be applied to the output power control of the power supply.

[0144] However, what is described above is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. All equivalent changes and modifications made according to the shape, structure, characteristics and spirit described in the patent application scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A power detection circuit, characterized in that: It includes: A sensing circuit coupled to the power supply, the sensing circuit having a plurality of impedance components, the sensing circuit detecting an output power signal of the power supply, and obtaining sensing impedances corresponding to the impedance components according to the output power signal, and the sensing circuit generating a power sensing signal according to the sensing impedance and the output power signal; as well as A signal generating circuit coupled to the sensing circuit, wherein the signal generating circuit is provided with a correction circuit, wherein the signal generating circuit generates a proportional power signal according to the power sensing signal, wherein the correction circuit generates a correction signal according to the proportional power signal and feeds back the correction signal to the signal generating circuit, thereby driving the signal generating circuit to further generate the proportional power signal according to the correction signal; The proportional power signal is used to control an output power of the power supply.

2. The power detection circuit as claimed in claim 1, characterized in that: The sensing circuit comprises: An amplifier circuit is coupled to the load sensing component and is provided with the impedance components. The load sensing component senses the output power signal to obtain a load sensing signal. The amplifier circuit obtains the sensing impedance according to the load sensing signal and the impedance components. The amplifier circuit amplifies the load sensing signal according to the sensing impedance to generate a gain signal. And a first conversion circuit generates the power sensing signal according to the gain signal.

3. The power detection circuit as claimed in claim 2, characterized in that: The sensing circuit further includes a summing circuit coupled to the voltage conversion circuit and summing the power sensing signal.

4. The power detection circuit as claimed in claim 2, characterized in that: The amplifier circuit includes: a first amplifier, which is coupled to the load sensing component and amplifies the load sensing signal; An impedance selection circuit is coupled to the first amplifier and is provided with the impedance components. The impedance selection circuit obtains the sensing impedance according to the load sensing signal and the impedance components; as well as The second amplifier is coupled to the impedance selection circuit and generates the gain signal according to the sensing impedance and the load detection signal.

5. The power detection circuit as claimed in claim 2, characterized in that: The first conversion circuit has a signal conversion ratio, and the first conversion circuit further generates the mirror current signal according to the signal conversion ratio.

6. The power detection circuit as claimed in claim 1, characterized in that: The signal generating circuit further comprises: An input circuit coupled to the sensing circuit and generating an input signal according to the power sensing signal; as well as A second conversion circuit is coupled to the input circuit and generates the proportional power signal according to the input signal; The correction circuit feeds back the correction signal to the second conversion circuit to drive the second conversion circuit to generate the proportional power signal according to the correction signal.

7. The power detection circuit as claimed in claim 6, characterized in that: The signal generating circuit further comprises: The trigger circuit is coupled to the correction circuit and generates a trigger signal to the correction circuit according to the start signal.

8. The power detection circuit as claimed in claim 1, wherein: The start signal corresponds to the output power signal or the power sensing signal or the proportional power signal.

9. A detection method for a power detection circuit, characterized in that: The steps include: The output power signal of the power supply is sensed by a sensing circuit and sensing impedances of a plurality of impedance components corresponding to the output power signal are obtained to generate a power sensing signal; Generate a proportional power signal according to the power sensing signal through a signal generating circuit; The correction circuit generates a correction signal according to the proportional power signal to drive the signal generating circuit to feedback control and generate the proportional power signal; The proportional power signal is used to control an output power of the power supply.

10. The detection method of the power detection circuit as claimed in claim 9, characterized in that: The step of sensing an output power signal of a power supply by a sensing circuit and selecting a sensing impedance according to the output power signal and a plurality of impedance components to generate a power sensing signal comprises: The load sensing component senses the output power signal to obtain a load sensing signal; The sensing impedance is selected by an amplifier circuit according to the load sensing signal and the impedance components to amplify the load sensing signal according to the sensing impedance to generate a gain signal; and the power sensing signal is generated by a first conversion circuit according to the gain signal.

11. The detection method of the power detection circuit as claimed in claim 10, characterized in that: The step of selecting the sensing impedance according to the load sensing signal and the impedance components through an amplifier circuit to amplify the load sensing signal according to the sensing impedance to generate a gain signal includes: amplifying the load sensing signal by a first amplifier; Obtaining the sensing impedance according to the load sensing signal and a plurality of impedance components through an impedance selection circuit; and The gain signal is generated by a second amplifier according to the sensing impedance and the load sensing signal.

12. The detection method of the power detection circuit as claimed in claim 10, characterized in that: In the step of generating the power sensing signal according to the gain signal by the first conversion circuit, the first conversion circuit further generates the power sensing signal according to a signal conversion ratio.

13. The detection method of the power detection circuit as claimed in claim 9, characterized in that: The step of generating a proportional power signal according to the sensing signal by a signal generating circuit includes: generating an input signal according to the sensing signal through an input circuit; and The proportional power signal is generated according to the input signal by the second conversion circuit.

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