TW201241445A - Power detection method for primary-side circuit of power supply and the power detection circuit - Google Patents

Abstract

A power detection method for primary-side circuit of power supply and the power detection circuit, in which the power detection method includes a voltage sampling procedure, a current sampling procedure and a power calculation procedure; where the voltage sampling procedure acquires the AC voltage signal of the city power and raises the DC level of AC voltage signal of the city power by letting the negative half cycle of the voltage signal as positive voltage level, then digitally transforms the AC voltage signal into DC sine signal, and then performs the voltage sampling at a certain time interval to obtain voltage RMS value. The current sampling procedure acquires the AC current signal of the city power, and then analogously transforms the AC current signal into DC sine signal, and then performs the current sampling at a certain time interval to obtain current RMS value. The power calculation procedure reads each of the acquired voltage and current sampled values, which are then multiplied with each other and finally divided by the cycle time to obtain power value.

Description

201241445 VI. Description of the Invention: [Technical Field] The present invention relates to a power supply method for a power supply, and a low-cost and high-precision primary-side circuit power detection method. [Prior Art] At present, a general-purpose computer or a high-end computer, such as a power supply for a server, has the ability to communicate with the motherboard in both directions. In order to ensure that the computer can normally switch on or off the servo sequence of the machine or the servo, the power supply is in addition to the door machine to detect that the output power is stable. 'Proactively notify the motherboard that the current power supply is good: the signal must return the current primary voltage value and current. The value and power value allow the power computer to know the power status of the power supply. Therefore, the power supply is in compliance with the requirements of the computer to report the power status. $ 豕 豕 豕 豕 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于Precisely record the turn-in voltage and input current of the power supply and establish a comparison table. When the detection circuit composed of the OP operational amplifier inside the power supply supply roughly estimates the voltage value and the current value, the table is checked by the comparison table, and the result of the check is returned to the computer. Since the look-up table is recorded by a precision meter, the accuracy of the detection result of the detecting circuit provided in the power supply is not required. However, this practice is still not optimal, because the comparison table is impossible to verify all the variables, so there is still a certain difference with the actual value, and as shown in Figure 9, in order not to increase. The cost of the above-mentioned table look-up procedure is directly executed by the original power supply inside the power supply 201204445. Therefore, the detection of the detected signal by the detection circuit into a DC signal can be directly input, that is, it cannot be directly calculated by some primary-side microprocessors, and the voltage signal is executed. And the current signal lin must pass through the primary side microprocessor "> however, such as the power value. Therefore, in order to meet the accuracy requirements, the power measurement 1C is used instead of the OP amplifier. The detection circuit 'causes the power measurement lc to perform precise calculations, so it can provide a more accurate power state' and also includes the calculation of the power value. The circuit using the power quantity wave j IC is as shown in FIG. 10, the power measurement end of the power measurement |C 4〇 is connected to (4), the supply side H circuit (4) the AC power input end Vin' and the current sensing The terminal is connected to a series of current detectors RD connected to the input end of the AC power source, and is further connected to the output end of the full-bridge rectifier 12 of the secondary side circuit 1〇, so as to accurately calculate the voltage value of the primary side circuit 1〇. , motor value and power value. Since the power measurement 4〇 is connected to the primary side circuit 10, the operation result must be output to the two-side circuit control benefit 31 and the l2c output interface 32 of the secondary side circuit 3〇 for transmission to the computer; The side circuit 1〇 is not the same as the second side circuit 3〇, so the power measurement IC 40 output signal must be transmitted through the signal conversion processor 41, the primary side microprocessor 13 and an optical coupler 14 to output to the second time. The side circuit controller 31 is finally outputted to the 丨丨◦ output interface 32 connected to the computer. As can be seen from the above description, in order to provide accurate primary side voltage value, electric: 'l value and power value difference, < A high-cost power measurement. Because the power 1 test C signal format is different from the primary side microprocessor, it is necessary to additionally add a - signal conversion processor to increase the cost of the overall power supply; The circuit of the side circuit power state needs to be improved step by step. 4 201241445 SUMMARY OF THE INVENTION In view of the above-mentioned prior art problems, the main object of the present invention is to provide a method for detecting the power of a primary side circuit of a power supply at a low cost, with high precision. The main technical means used to achieve the above purpose is that the power detection method is directly executed by the primary side microprocessor, and includes a voltage sampling program, a current sampling program and a power calculation program, wherein The voltage sampling program includes the following steps: taking the mains AC voltage signal; raising the DC level of the mains AC voltage signal, so that the negative half cycle voltage signal is a positive voltage level; the digital conversion AC voltage signal is a DC string signal; And voltage sampling at regular intervals to obtain a voltage rms value. The current sampling program includes the following steps: extracting a commercial AC current signal; analogizing the alternating current signal to a DC string signal; and sampling the current at a time interval to obtain a current rms value. The above power calculation program includes the following steps: reading the voltage and current sample values captured by the mother and the multiplication; and dividing by one cycle time to obtain the power value. In order to be directly executable by the primary side microprocessor, the method of the present invention does not need to additionally add a signal conversion processor, and the voltage rms value of the mains AC power supply is calculated to first increase the extracted commercial AC voltage signal. Its DC level ' makes the negative half-cycle voltage signal a positive voltage level, and can be directly transmitted to the human-side microprocessor for calculation at 201241445; and the commercial AC current signal directly takes the full-bridge filter of the human-side circuit. A current signal with a small amplitude can be obtained and converted into a DC sine wave signal analogously, and directly input to a human side microprocessor +, so that the primary side microprocessor can measure the voltage of the DC sine wave signal and the thunder , *, p & i: peach 'grab voltage and current sampling value for power transmission directly through the original primary side microprocessor and secondary side circuit controller communication pipeline 'output the operation result to the secondary side Circuit controller. In this way, the present invention does not have to use expensive power measurements, and the signal conversion processor provides the value of the ink, current, and power of the power used for the purpose. The power calculation program synchronously captures the voltage and current sampling values in the step of determining a complete cycle time, first presetting a voltage value and a current value, when continuously drawing the voltage or current sampling value, compared with the preset voltage value and Current value: When the output is higher than the result, lower than the result, higher than the result, and lower than the result, the voltage and current sampling are completed. In the above-mentioned power calculation program, in the step of synchronously grabbing the voltage and current sampling values, the table-correcting method is further adopted for the sampling value of the grab current, that is, the complex array correction parameter is established in the look-up table, and each group of correction parameter acquisition methods includes There are: Adjust the AC power supply voltage value of the power supply; During the period of outputting different voltage values, perform the following steps to obtain the current correction parameters of each output voltage value; adjust the current AC current current value for the first time; & - # The electric meter measures the first real electric RMS value of the analog DC sine wave current signal, and the first detection current sampling value after the synchronization is obtained, and the current correction parameter constitutes the first slanting operation formula; 6 201241445 Adjusting the current AC current value to measure the second real current rms value of the analog DC sine wave current signal with a precision meter, and synchronously obtaining the second detected current sample value after sampling, and matching the current correction parameter to form a second point slant An arithmetic expression; and solving the correction parameters of the first and second point oblique expressions, that is, obtaining the current input alternating current A set of current at a voltage value of the correction parameter. Therefore, when the corresponding current correction parameters of the different input voltage values are established, after the current primary current value is detected, the current correction parameter corresponding to the current input voltage value in the table can be read, and the detection side is corrected. The current value is close to the current value actually measured by a precision meter, and then the power is calculated. The main technical means used in the present invention is that the primary side circuit with the power detection function includes: a voltage §fl number conversion circuit connected to the AC power input end of the primary side circuit to capture the commercial AC voltage signal, And increase the DC level of the mains AC voltage signal, so that the negative half cycle voltage signal is positive voltage level output, and a current signal conversion circuit is connected to the primary bridge of the primary side circuit with a current detector. The output end of the analog bridge sine wave current signal has a reduced amplitude; the primary side microprocessor has its input terminal connected to the voltage signal conversion circuit and the current signal conversion circuit to compare the analog voltage signal Converting the DC sine wave signal, and then sampling the DC sine wave signal of the voltage and current in each cycle at a fixed time and multiplying the voltage and current sample values captured each time, and then dividing by Cycle time to obtain the power value. The above-mentioned invention directly obtains the voltage value, current value and power value of the commercial power source by the power supply-secondary circuit using the primary side microprocessor in conjunction with the simple voltage and power 201241445 flow signal conversion circuit. The primary side microprocessor further has a current correction reference table, wherein the input current waveform of the power supply varies with the input voltage, and the voltage and current signal conversion circuit is mainly composed of an operational amplifier, and the input current is After the op amp has distortion, in order to maintain a certain current detection accuracy, the primary side microprocessor must have a built-in current correction comparison table, and each time the current sampling value is obtained, the current correction is performed in a table lookup manner. [Embodiment] Please refer to FIG. 1 as a circuit block diagram of a power supply device including a primary side circuit of the present invention, wherein the primary side circuit system mainly includes an electromagnetic isolation unit 11 and a full bridge filter. 12, a BUKL capacitor cB, a transformer 1 5 primary side coil 1 51, a series connected to the transformer] 5 primary side coil 1 51 active switch Q and a primary side microprocessor 1 that controls the active switch Q open and close In addition, the power detecting circuit of the primary side circuit 1 of the present invention includes, in addition to the primary side microprocessor 13, a voltage signal conversion circuit 20' connected to the primary side circuit 1 〇 AC power input. The terminal Vin' draws the mains AC voltage signal, as shown in FIG. 3a and raises the DC level of the input voltage signal Va, so that the negative half-cycle signal is positive voltage level and then outputs; in this embodiment, As shown in FIG. 2, the voltage signal conversion circuit 20 includes a differential circuit 201 and a current level generating circuit 202. The forward and reverse input terminals of the differential circuit 201 are respectively connected to a power supply AC. The input terminals |_, N, and the forward input terminal 201241445 are further connected to the DC level generating circuit 202 to scale down the mains AC voltage signal Vin, and increase the AC voltage signal DC level 'to make the AC voltage signal amplitude not And a current signal conversion circuit 21 connected to the output end of the full-bridge filter 12 of the primary side circuit 10 by a current detector Rd, and the analog DC string outputted to the full-bridge filter 12 The wave current signal amplitude is reduced as shown in Figure 4B. In this embodiment, as shown in FIG. 3, the current signal conversion circuit 21 includes a differential circuit including a forward input terminal and an inverse input terminal, and the forward and reverse input terminals are respectively connected to The two ends of the current detector rd. The input terminal of the primary side microprocessor 13 of the present invention is respectively connected to the voltage signal conversion circuit 20 and the current signal conversion circuit 21. Since the amplitudes of the voltage signal and the current signal are reduced, the input to the primary side can be directly input. The processor 1 3; wherein the primary side microprocessor 彳3 converts the analog voltage signal digits into a DC sine wave signal, and then repeats the sine wave signal of the voltage and current in each period by a fixed time, and The voltage and current sample values captured each time are multiplied, and then divided by the cycle time to obtain the power value. Referring to FIG. 5A, the above-mentioned sub-microprocessor 彳3 must be able to determine the single-cycle time for the received voltage signal and current signal to calculate the power value; therefore, the single-microprocessor 13 - Cycle time D is judged, first preset - voltage value Vref and - current value, when the continuously captured voltage or current sample value, as shown in Figure 5B, compared to the preset voltage value Vref and the electric cooling value is judged to be higher than the result · Below the result, above the result, below the result: Then the voltage and current samples of the cycle time T are completed. Since the secondary side microprocessor 13 converts the input exchange signal digit 201241445 into a DC sine wave voltage signal v number 1〇, as shown in FIG. 4A & 48, the voltage is obtained synchronously due to the direct (four) wave power (4). When sampling values and motor sampling values, they can be directly multiplied for calculation of power values. : Based on the power supply input current will change with the input voltage signal size, the differential current system of the current and current signal conversion circuits 20, 21 is mainly composed of operational amplification gs, which will cause the input current to be distorted by the operational amplifier. Therefore, in order to maintain a certain current detection accuracy, the primary side microprocessor 13 must have a built-in current correction reference table, and each time the current sampling value is obtained, the current correction is performed by a look-up table method; the current correction comparison table includes There are multiple array input voltages and correction parameters; please refer to FIG. 6 , which is the method for obtaining the calibration parameters of each group in the above-mentioned current correction comparison table, which includes: adjusting the power supply output different voltage values Si 〇; During the voltage value period, the following steps are respectively performed to obtain the current correction parameter S1 1 of each output voltage value; the current AC current current value (80V/1 A) S 12 is adjusted for the first time; the analog DC sine wave current is measured by the precision electric meter. The first true current rms value of the signal is Μ. And synchronously obtaining the first detected current sampling value 丨 "msrawi ” and matching the current correction parameter to form a first point oblique expression:

Mci = CSn*lrmsraw1 + COffsetn (S13); adjust the current AC current current value (80V/15A) S14 for the second time; measure the second true current rms value Mu of the analog DC sine wave current signal with a precision meter, and The second detected current sampling value lrmsraW2 after sampling is obtained synchronously, and the second point oblique operation formula is constructed according to the current correction parameter: Mc2 = CSn*lrmsraw2 + COffsetn (S15); and 201241445, and the first and second points are deciphered. The correction parameter dc 〇 ffsetn of the oblique operation formula obtains a set of current calibration numbers S16 under the current input voltage (10) v). Through the above steps, the current correction parameters under different voltage values are repeatedly calculated, that is, the current calibration table in Table 1 below: CCP (voltage value) CCP1

CS (check gain

CS COffset (check offset value)

Coffseti CCP? CS:

Coffset CCP, CS,

Coffset, therefore, when the primary side microprocessor 13 obtains the current sampling value lrmsraw from the DC sine wave current signal, it can read the current current value in the current correction comparison table, "the current correction parameter of the coffee, and correct the detection. Know the primary current value Irmsraw, so that it is close to the current value 丨rms measured by the precision meter, to ensure the accuracy of the judged current value; the corrected current value is: IrmsMrmSrav/CSm + Coffset, for subsequent Power calculation.

If V rms CCP, for a wide range of available mains supply voltages for general-purpose power supplies, for example, from 80V to 1 64V, the current correction table for each input voltage must take considerable time. The current value of different currents under different voltage values must be detected by a precision meter (for example, 8〇v, 106V, 132V, 198V, 164V) to obtain the power 11 201241445 flow correction parameters of different input voltages; therefore, the present invention can adopt multiple segments. The meaning, that is, pre-storage, 'and voltage and its current correction parameter', if it is detected that the current voltage is not arbitrary - store more ', and the voltage' is taken closest to the current voltage value and is a small voltage value The current correction parameter performs a correction of the detected current. Since the power supply is overloaded, the current is more severely distorted by the voltage and current signal conversion circuit waveforms. Therefore, when 5 sets of voltages are applied, more voltage values can be taken in the heavy-load high-voltage range to obtain current correction. parameter. In addition, the present invention further provides a method for the current correction comparison table to store only the current correction parameters at different voltages of the array. If the primary side microprocessor detects that the current input voltage does not match the current correction parameter of the stored voltage, Then read the two-phase near voltage of the current voltage in the current correction comparison table, and extend it to its current voltage value by an interpolation algorithm to infer the current correction parameter of the current month 'J voltage value, as exemplified below; The detection voltage Vrms is determined to be located between the first voltage CCPm and the second voltage CCPm i stored in the current correction comparison table, wherein the current correction parameters corresponding to the first and second voltages are the verification gain values CSm, CSm, respectively. - 彳 and check offset values c 〇 ffsetm, Coffsetm", and the current correction parameters csm - 1m, Coffsetm.im of the known voltage Vrms, the internal difference calculation with the first and second voltage and its current correction parameters , as listed in the following two formulas:

CS m-lm C〇ffset„ CSm.,{CCPm -

~CCPm'l-;CCPm *CCP CCPm-CCPm_t C〇ffsetm_,{CCPm-Vrms) + COffsetm(Vrmi-CCPm_,) CCPm -CCPm.t then compare the current voltage Vrms value with the first and second voltages Size relationship, select a set of current correction parameters, for the current current correction, which includes 12 201241445 Yes: Reference parameter When the current electricity M is less than the first - electricity house, the current correction number of the first - electric current is "current" Msraw is corrected; when the current voltage falls between the first voltage and the second voltage, the current correction parameter obtained by the internal difference is corrected for the current current crypto coffee; and when the meshing voltage is greater than the second voltage, the Current correction of two voltages ^ < CCPm.x ifCCPm.t <Vn > CCP „ Correction of current current lrmsraw; firms = Irmsraw x CS^ + COffset _ 〇v ^CCP_ fn~\m >

Irms = Irmsraw x CSm_lm + COffset Irms = Irmsraw x CSm + COffsetn In this way, the primary side microprocessor 彳3 of the present invention can still use the preset current correction parameter even if the current correction parameters of all voltages are not built. The difference method is derived; please refer to FIG. 7A and FIG. 7B to pre-store four groups of W8GV '125V' 175V, 235V) and their corresponding current correction parameters with the internal difference method to push the current correction parameter (csm) nterpr 〇|atj〇n,

Coffsetjnterprolation), respectively, is calculated from the actual current correction parameters (CSm - "ea Coffset - real" and the segmented selection of current correction parameters (CSm_Section, Coffset - Section) calculated by precision electric meter measurement, as shown in the figure The segmented fit internal difference method can realize the stepless correction, and is close to the actual calculation result by the precision electric meter. Therefore, the present invention does not only need the primary side microprocessor to match the simple voltage and current. The signal conversion circuit can calculate the current voltage value, current value and power value of the power supply; and by simply pre-storing the complex array voltage and its current correction parameters, the current calculation can be performed in a segmental or non-segment manner. Using the current correction parameter of the electric voltage, the current synchronous detection current sampling is corrected to report the current value and the power value measured by the actual precision electric meter, and it is not necessary to use the expensive power measurement 丨c and the signal conversion processing. The power supply has power detection. It can be seen from the above that the power supply primary side circuit of the present invention The power detection method includes a voltage sampling program, a current sampling program and a power calculation program. As shown in FIG. 8, the voltage sampling program includes the following steps: taking a page to take a commercial AC voltage signal S20; The DC level of the voltage signal makes the negative half cycle voltage signal positive voltage level S21; the digital conversion AC voltage signal is DC string signal S22; and the voltage sampling is performed at a certain time interval to obtain a voltage rms value S23 〇 Moreover, the current sampling program includes the following steps: capturing the mains AC current signal S3〇; analogizing the alternating current signal to the DC string signal S31; and sampling the current at a certain time interval to obtain a current rms value S33 ° The above power calculation program includes the following steps: reading the voltage and current sampling values of each grab and multiplying them by S4〇; and dividing by one cycle time, obtaining the power value S41. The above power calculation program synchronously grabs In the voltage and current sampling value step, to determine a complete cycle time, first preset a voltage value and a The flow value 'when the continuously captured voltage or current sample value is judged to be the result, lower than the result, higher than the result, and lower than the result 201241445 compared with the preset voltage value and current value, it is known that a cycle has been completed. J. Voltage and current sampling. In the above power calculation program, ψ, 4+^4, step-by-step grab voltage and current sampling value step, for grab current sampling value 7 矣 途 ★ ★ 士 士 士 — — 采用 采用 采用 采用The table correction method, that is, the complex array correction parameter is established in the table - includes: and each group of fork positive parameter acquisition manners adjusts the power supply output different voltage values; and outputs different voltage values such as pq + Λ During the value period, perform the following steps to obtain the current correction parameters for each turn-off voltage value; 鞠 adjust the load of the power supply _ ^ ^ φ κ, and the battle is red, so that the power supply outputs the DC power signal; Using the precision electric meter to measure the first true current rms value of the class of the quaternary, ώ i - φ ^ ^ j ratio DC sine wave current signal, and the synchronous medium ^ ^", the first detection current after sampling sampling The value, combined with the current correction / number constitutes the first point of the oblique operation; then adjust the load of the power supply Λ take the horse heavy load 'to make the power supply output the first DC power signal; where the flute ^, Β π τ the first - And the voltage of the second DC power signal is the same, but the current is different; the electric power is also measured by a precision electric meter _ μι_古+ 1 with the second real electric power, the rms value of the 4 j-class DC sine wave current signal, and the synchronization The sample m.., the second detection current after the sampling is taken, the value, and the current correction is used to count the furnace A # / number to form the second point oblique operation formula; and the first and second points are interpreted obliquely瞀4 A 1 A ·, the correction parameter of the slanting π type, that is, the H flow correction parameter under the target output voltage value. Therefore, when the present invention detects the 电流_. 】 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖 刖The current value of one or two people is close to the current measured by the actual quantity of the goods in the meter. 15 201241445 [Simplified diagram] Figure 1: Block diagram of an isolated switching power supply. Figure 2 is a waveform diagram of the alternating voltage signal of the present invention. Figure 3 is a waveform diagram of the alternating current signal of the present invention. Fig. 4A is a detailed circuit diagram of a voltage signal conversion circuit of the present invention. Figure 4B is a detailed circuit diagram of the current signal conversion circuit of the present invention. Fig. 5A is a waveform diagram for determining a single cycle time of the DC sine wave voltage signal of the present invention. Fig. 5B is a waveform diagram showing the sampled voltage value of the DC sine wave voltage signal of the present invention. Fig. 6 is a flow chart showing the procedure for establishing a set of correction parameters in the current correction comparison table of the present invention. Fig. 7A is a statistical table of the check gain value calculated by the segmented, stepless current correction mode and the actual precision electric meter. Fig. 7B is a statistical table of check offset values calculated by the segmented, stepless current correction method and the actual precision electric meter. Figure 8 is a flow chart of the power detection method of the present invention. Figure 9 is a current waveform diagram of the primary side circuit of an isolated switched power supply. Figure 10. A circuit diagram of an isolated switched-mode power supply. 11 electromagnetic isolation unit [main component symbol description] 1 0 - secondary side circuit 16 201241445 1 2 full bridge rectifier 14 optical coupler 1 51 - secondary side coil 201 differential circuit 21 current signal conversion circuit 31 secondary side circuit controller 40 Power measurement IC 1 3 - secondary side microprocessor 15 5 dust filter 20 voltage signal conversion circuit 202 DC level adjustment circuit 30 secondary side circuit 32 l2C output interface 41 signal conversion processor 17

Claims (1)

201241445 VII. Patent application scope: 1. A power supply detection method for a power supply primary side circuit includes a voltage sampling program, a current sampling program and a power calculation program, wherein: the voltage sampling program includes the following steps: Take the mains AC voltage signal; increase the DC level of the mains AC voltage signal, so that the negative half cycle voltage signal is positive voltage level; the digital conversion AC voltage signal is DC string signal; and the voltage sampling is performed at regular intervals. Obtaining a voltage rms value; the current sampling program includes the following steps: extracting a commercial AC current signal; analogizing the alternating current signal to a DC sine wave signal; and sampling the current at a certain time interval to obtain a current mean square The root value; and the above power juice program includes the following steps: reading each of the captured electrical and current sampling values and multiplying them; and dividing by one cycle time to obtain the power value. 2. For the power rate k-measurement method of the primary side of the power supply as described in the patent scope of the invention, the power calculation program synchronously captures the voltage and current: in the sample step, "to judge" a complete cycle time First, preset a voltage <two motor value' when continuously drawing the voltage or current sample value, compared with the pre-value and current value to judge higher than the result, lower than the result, higher than the result, lower than the result, Then we know that 匕70 is a cycle of voltage and current sampling. For example, in the power detection method of the primary side 18 201241445 circuit of the power supply device described in the scope of the patent application, in the step of synchronously grasping the voltage and current sampling value of the above power calculation program, the current sampling value is captured and then the table lookup method is used. Correction. This look-up table method establishes a current correction comparison table, which includes a complex array voltage and its current correction parameter, reads the current correction parameter value according to the synchronous capture voltage value, and samples the current. The value is corrected. 4 The power detection method of the primary side circuit of the power supply device as described in claim 3, wherein the calibration parameter setting manner of the current correction comparison table includes: adjusting the power supply output different voltage values; During the different voltage value periods, the following steps are respectively performed to obtain the current correction parameters of the respective output voltage values; the first adjustment of the AC power supply current; and the measurement of the first real current rms value of the analog DC sine wave current signal by the precision meter' And synchronously obtaining the first detection current sampling value after sampling, and matching the current correction parameter to form a first point oblique operation formula; adjusting the AC power supply current for the second time; measuring the second real current of the analog DC sine wave current signal by using a precision electric meter a root mean square value, and a second detected current sample value after the synchronization is obtained, and a second point oblique operation formula is matched with the current correction parameter; and the correction parameters of the first and second point oblique expressions are solved, that is, obtained A set of current correction parameters at the current voltage value. 5. According to Shen Qing Patent Range 帛 4, the power detection method of the primary side circuit of the power supply device, the above table lookup method reads the motor %c JL parameter value according to the synchronous grabbing voltage value, if the check It is known that the current voltage does not match the current calibration, and any voltage in the table is read. The current correction is performed by reading the electrical μ correction parameter of the current value of 19 201241445 which is the closest to the current voltage. 6. The power detection method of the primary side circuit of the power supply device as described in claim 4 of the patent application scope, wherein the above-mentioned table lookup method is based on the synchronous capture of the electric value reading step - the current value of the current value of the current value It is known that the current electric house does not match any one of the current correction comparison tables, and then reads a current voltage and its current correction parameter which is closest to the current voltage in the current correction comparison table, and calculates the current correction of the current voltage by the internal difference method. parameter. 7. The power detection method for the primary side circuit of the power supply device according to claim 6, wherein the current correction parameter includes a check gain value and a check offset value, and the current voltage is used to estimate the current voltage. The current correction parameter includes: 7 the first voltage cpmm and the second voltage c〇pm1 are closest to the current voltage V; and the current correction parameters for reading the second voltage and the second voltage, including the verification gain values CSm, CSm·! Check the offset values c〇ffSetm, Coffsetw; perform the internal difference operation to calculate the current gain check value CSm_^ and the check offset value C0ffsetm 1m: m -CCP„ ccpm - one, ccp, ccp - COffsel , =g〇ggWCCPw-Vrms) + COffseiJVrmr-CCP^) · CCP-CCP^ ' Compare the current voltage vrms value with the magnitude of the first and second voltages, select the group current correction parameter, and correct the current current The method includes: when the current voltage is less than the first voltage, correcting the current current lrmsraw with the current correction parameter of the first voltage; when the current voltage falls between the first voltage and the second voltage, the internal difference method is 2012414 45 The current correction parameter is corrected for the current current yaw aw; and when the current voltage is greater than the second voltage, the current current lrmsraw is corrected by the current correction parameter of the second voltage; Irms = Irmsraw, CSm.i+C 〇ffSetm_u <〇〇ρ Bu = +. Sangha-; 〇: Pdccp. {lrms = IrmsrawxCSm+C〇ffsetm ifVJ>cc; mm 8. - Power supply - power detection circuit for the secondary circuit, including There are: Eight-voltage signal conversion circuit 'connected to the AC power input terminal of the primary side circuit' to capture the commercial AC voltage signal, and raise the DC level of the commercial AC voltage signal, so that the negative half cycle voltage signal is positive voltage After the level is output, a current signal conversion circuit is connected to the output end of the full-bridge filter of the secondary circuit by the current detector, and the output is switched to the edge of the full bridge. The analog dc sine wave current signal amplitude is reduced; & the primary side microprocessor wheel 岵 八 eight we ^ do not enter the k system / knife connected to the voltage signal conversion circuit and current signal conversion circuit, due to electricity The amplitudes of the voltage signal and the current signal have been reduced, so the bowl can be directly input to the primary side microprocessor; wherein the primary side microprocessor converts the analog voltage to the DC string signal, and then Sampling the DC chord signal of the voltage and current in each of the fine-tuning-+J-like cycles at a fixed time, and will now recognize the voltage of the bamboo-person-carrying The current sample value is multiplied and then divided by the cycle time to obtain the power value. 9. The power detection circuit of claim 8, wherein the voltage signal conversion circuit comprises: a DC level generating circuit; and the differential circuit 'the forward and reverse input terminals are respectively connected to the power source The supplier AC power supply wheel terminal L, N 'where the forward input terminal is connected to the step 21 201241445 to the DC level generating circuit to proportionally reduce the commercial AC voltage signal, and increase the AC voltage signal to make the AC voltage The signal amplitude is not less than zero. 1 0. The power detection circuit according to claim 8 or 9, wherein the current signal conversion circuit comprises a differential circuit including a forward input terminal and a reverse input terminal. The input ends are respectively connected to the two ends of the current detector. 11 · The power detection circuit according to item 1 of the scope of the patent application, the primary side microprocessor calculates a single cycle time for determining the voltage signal and the current signal, and presets a voltage value and a current value, when continuously grasping The sampled voltage or current sample value is compared with the preset voltage value and the current value to determine that the voltage and current samples have been completed for one cycle when the result is higher than the result, lower than the result, higher than the result, and lower than the result. 1 2 If the power detection circuit described in item 1 of the Shenqing patent scope, the primary side microprocessor is built-in current correction comparison table, the current correction for the I table includes the complex array voltage and its current correction parameters. The current sampling value is corrected according to the current reading parameter value of the current reading voltage positive parameter according to the current detection voltage method. 1 3. If the power detection circuit described in item 2 of the patent scope is applied, ^ the primary side microprocessor reads the 1 stream correction parameter value according to the synchronous capture voltage value by the look-up table method, if it is detected At present, the voltage is not matched to the current correction, and the current correction parameter of the current voltage is the closest and smaller. 14. The power detection circuit according to item 12 of the patent scope, the ancient primary side microprocessor uses the look-up table method to read the current flow correction parameter value according to the synchronous grabbing voltage value, if the current voltage is not detected Matching the current correction, 22 .201241445 According to any voltage in the table, the current correction reference table reads the two voltages closest to the current voltage and its current correction parameters, and calculates the current correction parameters of the current voltage by the internal difference method. 15. The power detection circuit according to claim 14, wherein the current correction parameter includes a verification gain value and a verification offset value, and the current correction parameter corresponding to the current voltage by the internal difference method includes: 7 The first voltage CCPm and the second voltage cCPm" are closest to the current voltage Vrms; and the current correction parameters of the first voltage and the second voltage are read, including the check gain values CSm, CSm-·!, and the check offset value C〇ffsetm, c〇ffsetm i ; perform internal differential operation to calculate the current voltage calibration gain value CSmi π and check offset value COffsetm.1m: CCPm ~ CCP^. First, CCP household CCP„-' + COffsetm(yrmr-CCP_.). CCPm-CCP' cs-m ~ ccpm CQffset / Revising the relationship between the vrms value of the meshing voltage and the magnitude of the first and second voltages' Select a set of current correction parameters, Current correction, 纟 includes: when the current voltage is less than the first voltage m - the current correction parameter corrects the current current | rmSraw; when the current voltage falls between the first voltage and the second voltage, the internal difference method is used The current correction parameter is current The stream lnmsraw is corrected; and when the current voltage is greater than the second voltage, the current correction parameter of the second voltage is corrected for the current current ms "msraw; / Irms = Irmsrttw x CSm_Xm + C〇ffs^t Irms = Irmsraw x CSm + COffset Irms = Irmsmw x CS,^ + COffi^ Cut < CCP an if〇CPm.l<Vrna^CCPm ifV->CCP„ 23