CN115882739A - Power supply voltage adjusting method, rectification power supply and control circuit - Google Patents
Power supply voltage adjusting method, rectification power supply and control circuit Download PDFInfo
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Abstract
The application relates to a power supply voltage adjusting method, a rectification power supply and a control circuit. The method comprises the following steps: the method comprises the steps of obtaining a first pulse width modulation signal loaded at a controlled end of a direct current voltage conversion circuit, determining a first duty ratio of the first pulse width modulation signal, obtaining an output voltage, an input current and an input voltage of a power factor correction circuit, and calculating a difference value between the first duty ratio and an expected duty ratio. And then determining a reference voltage according to the difference value, and adjusting a second duty ratio of the second pulse width modulation signal according to the reference voltage and the output voltage, the input current and the input voltage of the power factor correction circuit so as to adjust the voltage output by the power factor correction circuit. The output voltage of the power factor correction circuit is adjusted based on the comparison result of the first duty ratio of the direct current conversion circuit and the expected duty ratio, and the overall output conversion efficiency of the rectification power supply is improved under the condition that the first duty ratio of the direct current conversion circuit is kept relatively stable.
Description
Technical Field
The present application relates to the field of charging technologies, and in particular, to a power supply voltage adjusting method, a rectifier power supply, and a control circuit.
Background
With the development of switching power supplies and charging technologies, various AC/DC (Alternating Current/Direct Current) rectified power supplies have appeared.
The existing AC/DC rectified Power supply mostly consists of a PFC (Power Factor Correction) circuit and a DC/DC (Direct Current/Direct Current) circuit, and the output voltage of the PFC circuit is adjusted based on the output voltage of the DC/DC circuit, so as to improve the overall output conversion efficiency of the AC/DC rectified Power supply.
However, the current output voltage regulation strategy of the PFC circuit still has the problem that the overall output efficiency is too low.
Disclosure of Invention
In view of the above, it is desirable to provide a power supply voltage adjusting method, a rectified power supply, and a control circuit that can improve the overall output conversion efficiency of an AC/DC rectified power supply.
In a first aspect, a power supply voltage adjusting method is provided, which is applied to a control circuit in a rectified power supply, the rectified power supply includes a power factor correction circuit, a dc voltage conversion circuit and a control circuit, an input terminal of the power factor correction circuit is used for accessing a power supply network, an output terminal of the power factor correction circuit is connected with an input terminal of the dc voltage conversion circuit, an input terminal of the control circuit is connected with a controlled terminal of the dc voltage conversion circuit, an input terminal of the power factor correction circuit and an output terminal of the power factor correction circuit, and a control terminal of the control circuit is connected with the controlled terminal of the power factor correction circuit, the method includes:
acquiring a first pulse width modulation signal loaded at a controlled end of a direct current voltage conversion circuit, and determining a first duty ratio of the first pulse width modulation signal;
acquiring output voltage, input current and input voltage of a power factor correction circuit;
calculating a difference between the first duty cycle and the desired duty cycle; when the expected duty ratio is the highest conversion efficiency of the direct-current voltage conversion circuit, the duty ratio of a pulse width modulation signal loaded at the controlled end of the direct-current voltage conversion circuit;
determining a reference voltage according to the difference;
adjusting a second duty ratio of the second pulse width modulation signal according to the reference voltage and the output voltage, the input current and the input voltage of the power factor correction circuit so as to adjust the voltage output by the power factor correction circuit;
the second pulse width modulation signal is a signal loaded on the controlled end of the power factor correction circuit.
In one embodiment, determining the reference voltage based on the difference comprises:
acquiring a preset duty ratio stepping threshold;
and under the condition that the difference value is larger than zero and larger than a preset duty ratio stepping threshold value, the latest stored reference voltage is adjusted upwards, and the adjustment result of the latest stored reference voltage is used as the reference voltage.
In one embodiment, in a case where the difference value is greater than zero and greater than a preset duty ratio step threshold, the step-up of the latest stored reference voltage and the step-up result of the latest stored reference voltage as the reference voltage includes:
under the condition that the difference value is larger than zero and larger than a preset duty ratio stepping threshold value, acquiring the latest stored reference voltage and the reference voltage correction quantity;
the reference voltage is determined by the sum of the newly stored reference voltage and the reference voltage value modifier.
In one embodiment, determining the reference voltage based on the difference comprises:
acquiring a preset duty ratio stepping threshold;
and under the condition that the difference value is smaller than zero and the absolute value of the difference value is larger than the preset duty ratio stepping threshold value, the latest stored reference voltage is adjusted downwards, and the adjustment result of the latest stored reference voltage is used as the reference voltage.
In one embodiment, in a case where the difference is smaller than zero and the absolute value thereof is larger than the preset duty ratio step threshold, the step-down of the latest stored reference voltage and the step-down result of the latest stored reference voltage as the reference voltage include:
under the condition that the difference value is smaller than zero and the absolute value of the difference value is larger than a preset duty ratio stepping threshold value, acquiring the latest stored reference voltage and the reference voltage correction quantity;
the reference voltage is determined from the difference between the newly stored reference voltage and the correction amount of the reference voltage value.
In one embodiment, the step of obtaining the output voltage, the input current and the input voltage of the power factor correction circuit further comprises:
sampling the output voltage of the direct-current voltage conversion circuit;
calculating the absolute value of the difference value between the output voltage of the direct-current voltage conversion circuit and the preset output voltage;
comparing the absolute value with a preset voltage threshold;
and under the condition that the accumulated times of the absolute value greater than the preset voltage threshold is greater than the preset times, the step of acquiring the output voltage, the input current and the input voltage of the power factor correction circuit is carried out.
In one embodiment, the method further comprises:
if the accumulated times of the absolute value being smaller than the preset voltage threshold is smaller than or equal to the preset times, executing the following steps until the accumulated times of the absolute value being larger than the preset voltage threshold is larger than the preset times:
acquiring the output voltage of the direct-current voltage conversion circuit;
determining a reference voltage according to the output voltage of the direct-current voltage conversion circuit, a preset output voltage, the turn ratio of a primary coil and a secondary coil of the direct-current voltage conversion circuit and a first duty ratio;
and acquiring the output voltage, the input current, the input voltage and the reference voltage of the power factor correction circuit, and adjusting the second pulse width modulation signal to stabilize the output voltage of the power factor correction circuit.
In one embodiment, the method further comprises:
acquiring the output voltage of the direct-current voltage conversion circuit;
calculating the absolute value of the difference value between the output voltage of the direct-current voltage conversion circuit and the preset output voltage;
comparing the absolute value with a preset voltage threshold;
and when the absolute value is smaller than the preset voltage threshold, circularly executing the method steps for regulating the power supply voltage in the embodiment until the absolute value is larger than the preset voltage threshold.
In a second aspect, a rectified power supply is provided, which includes a power factor correction circuit, a dc voltage conversion circuit, and a control circuit, where an input terminal of the power factor correction circuit is used to access a power supply network, an output terminal of the power factor correction circuit is connected to an input terminal of the dc voltage conversion circuit, an input terminal of the control circuit is connected to a controlled terminal of the dc voltage conversion circuit, an input terminal of the power factor correction circuit, and an output terminal of the power factor correction circuit, a control terminal of the control circuit is connected to the controlled terminal of the power factor correction circuit, and the control circuit is configured to perform the power supply voltage regulation method in any one of the above embodiments.
In a third aspect, a control circuit is provided, which comprises a memory and a processor, the memory storing a computer program, and the processor implementing the steps of the method in any of the above embodiments when executing the computer program.
The power supply voltage adjusting method, the rectifying power supply and the control circuit are based on the rectifying power supply composed of the power factor correction circuit, the direct current voltage conversion circuit and the control circuit, the control circuit is used for obtaining a first pulse width modulation signal loaded at a controlled end of the direct current voltage conversion circuit, determining a first duty ratio of the first pulse width modulation signal, simultaneously obtaining output voltage, input current and input voltage of the power factor correction circuit, and calculating a difference value of the first duty ratio and an expected duty ratio. When the desired duty ratio is the highest conversion efficiency of the direct-current voltage conversion circuit, the duty ratio of the pulse width modulation signal loaded at the controlled end of the direct-current voltage conversion circuit is obtained. And then determining a reference voltage according to the difference value, and adjusting a second duty ratio of the second pulse width modulation signal according to the reference voltage and the output voltage, the input current and the input voltage of the power factor correction circuit so as to adjust the voltage output by the power factor correction circuit. The second pulse width modulation signal is a signal loaded on the controlled end of the power factor correction circuit. The output voltage of the power factor correction circuit is adjusted based on the comparison result of the first duty ratio of the direct current conversion circuit and the expected duty ratio, and the overall output conversion efficiency of the rectification power supply is improved under the condition that the first duty ratio of the direct current conversion circuit is kept relatively stable.
Drawings
FIG. 1 is a schematic diagram of an exemplary embodiment of a power supply voltage regulation method;
FIG. 2 is a schematic flow chart diagram of a method for regulating power supply voltage in one embodiment;
FIG. 3 is a schematic flow chart of a method for regulating power supply voltage in another embodiment;
FIG. 4 is a schematic flow chart of a supply voltage adjustment method according to yet another embodiment;
FIG. 5 is a schematic flow chart diagram of a method for regulating power supply voltage in accordance with yet another embodiment;
FIG. 6 is a schematic flow chart of a supply voltage regulation method in yet another embodiment;
FIG. 7 is a schematic diagram of a rectified power supply according to an embodiment;
FIG. 8a is a schematic diagram illustrating an overall flowchart of a method for regulating a supply voltage according to an embodiment;
FIG. 8b is a schematic flow diagram of portion A of the overall flow diagram of FIG. 8 a;
FIG. 8c is a schematic flow chart of part B of the overall flow chart of FIG. 8 a;
FIG. 9 is a block diagram showing the structure of a power supply voltage regulator according to an embodiment;
FIG. 10 is a diagram showing an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The method for adjusting the power supply voltage provided by the embodiment of the application can be applied to the application environment shown in fig. 1. The rectified power supply comprises a power factor correction circuit 104, a direct current voltage conversion circuit 106 and a control circuit 102, wherein an input end of the power factor correction circuit 104 is used for being connected to the power supply network 100, an output end of the power factor correction circuit 104 is connected with an input end of the direct current voltage conversion circuit 106, an input end of the control circuit 102 is connected with a controlled end of the direct current voltage conversion circuit 106, an input end of the power factor correction circuit 104 and an output end of the power factor correction circuit 104, a control end of the control circuit 102 is connected with the controlled end of the power factor correction circuit 104, an output end of the direct current voltage conversion circuit 106 is used for being connected with a load 300, output voltage or current of the rectified power supply is input to the load 300, and power is supplied to the load 300. The control circuit 102 obtains a first pulse width modulation signal loaded at the controlled end of the dc voltage conversion circuit 106, determines a first duty ratio of the first pulse width modulation signal, further obtains an output voltage, an input current and an input voltage of the power factor correction circuit 104, and calculates a difference value between the first duty ratio and an expected duty ratio; when the desired duty ratio is the highest conversion efficiency of the dc voltage conversion circuit 106, the duty ratio of the pulse width modulation signal loaded to the controlled end of the dc voltage conversion circuit 106; then the control circuit 102 determines a reference voltage according to the difference; adjusting a second duty ratio of the second pulse width modulation signal according to the reference voltage and the output voltage, the input current and the input voltage of the power factor correction circuit 104 to adjust the voltage output by the power factor correction circuit 104; the second pwm signal is a signal applied to the controlled terminal of the pfc circuit 104.
In one embodiment, as shown in fig. 2, a power supply voltage regulation method is provided, which is described by taking as an example the method applied to the control circuit of the rectified power supply in fig. 1, and the method comprises the following steps:
s202, acquiring a first pulse width modulation signal loaded at a controlled end of the direct current voltage conversion circuit, and determining a first duty ratio of the first pulse width modulation signal.
The DC voltage conversion circuit is a DC/DC circuit, and further may refer to a phase-shifted full-bridge circuit, a resonant circuit, and the like, which is used to perform voltage boost or voltage buck conversion on the voltage input thereto, and it should be noted that the selection of the electronic components and the specific connection relationship in the circuit may be set by those skilled in the art as needed, and are not limited herein. The first pulse width modulation signal is an electrical signal for controlling the on-time of a Metal-Oxide-Semiconductor (MOS) transistor in the dc-to-dc voltage conversion circuit to implement output of the switching regulator power supply; and the first duty ratio is the proportion of the conduction time of the MOS tube in the first pulse width modulation signal to the control time of the total pulse width modulation signal.
And S204, acquiring the output voltage, the input current and the input voltage of the power factor correction circuit.
The power factor correction circuit is a circuit that performs power factor correction on an output voltage of a power supply network and outputs a bus voltage, and in a specific embodiment, the power factor correction circuit may be a three-phase wiener circuit, a boost (boost) circuit, or the like. The output voltage of the power factor correction circuit refers to the bus voltage output after power factor correction; the input current of the power factor correction circuit refers to one phase of alternating current in three phases of alternating currents output from a power supply network, for example, three phases of alternating currents of the three phases of alternating currents are a phase of alternating current, B phase of alternating current and C phase of alternating current, and the input current of the power factor correction circuit is one phase of the a phase of alternating current, the B phase of alternating current and the C phase of alternating current. Similarly, the meaning of the input voltage of the pfc circuit is similar to the input current of the pfc circuit, and is not described herein again.
S206, calculating a difference value between the first duty ratio and the expected duty ratio; when the desired duty ratio is the highest conversion efficiency of the direct current voltage conversion circuit, the duty ratio of the pulse width modulation signal loaded on the controlled end of the direct current voltage conversion circuit.
It should be noted that, in an actual dc voltage conversion circuit, there is a certain loss in both on and off of the MOS transistor, so that the dc voltage conversion circuit causes energy loss in the voltage boosting or reducing process, and the energy conversion efficiency is too low. For example, under the condition that the load is less in access, in order to ensure the normal operation of the load and avoid overvoltage damage, the duty ratio of an MOS transistor in the direct current voltage conversion circuit needs to be reduced under the condition that the output voltage of the power factor conversion circuit is not changed, so that the voltage requirement of the load is met; however, when the output voltage of the power factor conversion circuit is too high, the duty ratio of the MOS transistor in the dc voltage conversion circuit is forcibly reduced to meet the voltage requirement when the load is low, which may cause the turn-on and turn-off loss of the MOS transistor to be increased, and reduce the conversion efficiency of the dc voltage conversion circuit. Furthermore, under the condition that the load is connected more, in order to ensure the normal operation of the load and avoid the influence of too low voltage on the performance of the equipment, the duty ratio of an MOS (metal oxide semiconductor) tube in the direct current voltage conversion circuit needs to be increased under the condition that the output voltage of the power factor conversion circuit is not changed, so that the voltage requirement of the load is met; when the output voltage of the power factor conversion circuit is too low, the duty ratio of the MOS transistor in the dc voltage conversion circuit may not be increased, and the voltage requirement of the load may still be satisfied.
When the desired duty ratio is the highest conversion efficiency of the dc voltage conversion circuit, the duty ratio of the pwm signal applied to the controlled terminal of the dc voltage conversion circuit, i.e. the output voltage regardless of the power factor, can maintain the conversion efficiency of the dc voltage conversion circuit at the highest level, for example, in a specific embodiment, the desired duty ratio is 90%. It should be noted that the selection of the desired duty ratio is set according to the actual circuit structure of the dc voltage converting circuit, and the desired duty ratio of 90% in the above embodiment is merely used as an example and is not limited herein. And the difference between the first duty cycle and the desired duty cycle is indicative of the deviation of the first duty cycle from the desired duty cycle.
And S208, determining a reference voltage according to the difference.
The reference voltage is a target voltage when the power factor correction circuit adjusts the output voltage, that is, the output voltage is adjusted based on the reference voltage, so that the output voltage of the power factor correction circuit reaches the reference voltage as much as possible.
And S210, adjusting a second duty ratio of the second pulse width modulation signal according to the reference voltage, the output voltage, the input current and the input voltage of the power factor correction circuit so as to adjust the voltage output by the power factor correction circuit.
The second pulse width modulation signal is a signal loaded at the controlled end of the power factor correction circuit and is used for controlling the conduction time of an MOS (metal oxide semiconductor) tube in the power factor correction circuit so as to adjust the voltage output by the power factor correction circuit.
Specifically, it should be noted that the control circuit may include a voltage loop, a current reference signal determination module, and a triangular wave modulator. The input end of the voltage loop is connected with the output end of the power factor correction circuit, the output end of the voltage loop is connected with the input end of the current reference signal determining module, the input end of the current reference signal determining module is also used for being connected with a power supply network, the output end of the current reference signal determining module is connected with the input end of the current loop, the input end of the current loop is also used for being connected with the power supply network, the output end of the current loop is connected with the input end of the triangular wave modulator, and the output end of the triangular wave modulator is connected with the power factor correction circuit.
After obtaining the reference voltage, the output voltage, the input current and the input voltage of the power factor correction circuit, inputting the reference voltage and the output voltage of the power factor correction circuit into a voltage loop in the control circuit to obtain a voltage loop output result, inputting the result and the input current of the power factor correction circuit into a current reference signal determination module to obtain a current reference signal, then obtaining a duty ratio of a pulse width modulation signal corresponding to the on-off control of an MOS (metal oxide semiconductor) transistor in the power factor correction circuit by the current loop based on the current reference signal and the input current of the power factor correction circuit, inputting the duty ratio into a triangular wave modulator, obtaining a driving electric signal for driving the MOS transistor of the power factor correction circuit by the triangular wave modulator based on the duty ratio, and further adjusting the output voltage of the power factor correction circuit.
In the above embodiment, based on the rectified power supply composed of the power factor correction circuit, the dc voltage conversion circuit, and the control circuit, the control circuit obtains the first pulse width modulation signal loaded at the controlled end of the dc voltage conversion circuit, determines the first duty ratio of the first pulse width modulation signal, obtains the output voltage, the input current, and the input voltage of the power factor correction circuit, and calculates the difference between the first duty ratio and the desired duty ratio. When the desired duty ratio is the highest conversion efficiency of the direct-current voltage conversion circuit, the duty ratio of the pulse width modulation signal loaded at the controlled end of the direct-current voltage conversion circuit is obtained. And then determining a reference voltage according to the difference value, and adjusting a second duty ratio of a second pulse width modulation signal according to the reference voltage and the output voltage, the input current and the input voltage of the power factor correction circuit so as to adjust the voltage output by the power factor correction circuit. The second pulse width modulation signal is a signal loaded on the controlled end of the power factor correction circuit. The output voltage of the power factor correction circuit is adjusted based on the comparison result of the first duty ratio of the direct current conversion circuit and the expected duty ratio, the overall output conversion efficiency of the rectification power supply is improved under the condition that the first duty ratio of the direct current conversion circuit is kept relatively stable, and the problem that the output capacity of the rectification power supply is insufficient due to too low output voltage of the power factor correction circuit is solved.
In one embodiment, determining the reference voltage from the difference comprises:
and S302, acquiring a preset duty ratio stepping threshold.
The preset duty ratio step threshold is a standard threshold in the step calculator, and is used for measuring a deviation between the first duty ratio and the expected duty ratio, for example, the preset duty ratio step threshold may be set to be 1%, and when a difference between the first duty ratio and the expected duty ratio is 2%, it indicates that the deviation between the first duty ratio and the expected duty ratio exceeds a preset range, and the first duty ratio needs to be adjusted. However, as can be seen from the above embodiments, the first duty ratio is not changed during the adjustment of the output voltage of the power factor correction circuit, so that the deviation condition reflects the need to adjust the reference voltage that affects the adjustment of the output voltage of the power factor correction circuit. It should be noted that the preset duty ratio step threshold may be set according to the adjustment accuracy of the power supply voltage, and is not limited herein.
And S304, under the condition that the difference value is larger than zero and larger than the preset duty ratio stepping threshold value, the latest stored reference voltage is adjusted upwards, and the adjustment result of the latest stored reference voltage is used as the reference voltage.
The latest stored reference voltage may refer to an initial reference voltage input by the control circuit during initial adjustment of the power supply voltage, or may refer to a reference voltage updated into the memory after the last adjustment during adjustment.
In the above embodiment, based on the comparison between the preset duty ratio step threshold and the difference between the first duty ratio and the desired duty ratio, when the difference is greater than zero and greater than the preset duty ratio step threshold, the latest stored reference voltage is adjusted up to determine the reference voltage, and then the voltage output by the power factor correction circuit is adjusted based on the reference voltage, so that the adjustment precision is higher.
In one embodiment, in a case that the difference value is greater than zero and greater than a preset duty ratio step threshold, the step-up of the newly stored reference voltage and the step-up result of the newly stored reference voltage as the reference voltage includes:
s306, acquiring the latest stored reference voltage and the reference voltage correction quantity under the condition that the difference value is larger than zero and larger than the preset duty ratio stepping threshold value;
and S308, determining the reference voltage according to the sum of the newly stored reference voltage and the reference voltage value correction quantity.
The reference voltage correction amount is a value for correcting the reference voltage, that is, the reference voltage is corrected when the reference voltage does not meet the power supply voltage regulation requirement. The specific setting value can be set according to the actual precision requirement, and the data can be directly stored in the memory and can be directly acquired in the determination process of the control circuit on the reference voltage.
In the above embodiment, when the difference is greater than zero and greater than the preset duty ratio step threshold, the latest stored reference voltage and the correction amount of the reference voltage are summed, and the value of the latest stored reference voltage is adjusted up, so as to determine the reference voltage, that is, a more accurate value of the reference voltage is obtained, and the accuracy of adjusting the voltage output by the power factor correction circuit is improved.
In one embodiment, determining the reference voltage based on the difference comprises:
s302, acquiring a preset duty ratio stepping threshold;
and S310, under the condition that the difference value is smaller than zero and the absolute value of the difference value is larger than the preset duty ratio stepping threshold value, the latest stored reference voltage is adjusted downwards, and the adjustment result of the latest stored reference voltage is used as the reference voltage.
In this embodiment, the meaning of the preset duty ratio step threshold is similar to that in the above embodiment, and the step of determining the reference voltage according to the difference is also similar to that in the above embodiment, and is not described herein again.
In the above embodiment, based on the comparison between the preset duty ratio step threshold and the difference between the first duty ratio and the desired duty ratio, the latest stored reference voltage is adjusted downward when the difference is smaller than zero and the absolute value of the difference is greater than the preset duty ratio step threshold, so as to determine the reference voltage, and then the voltage output by the power factor correction circuit is adjusted based on the reference voltage, so that the adjustment accuracy is higher.
In one embodiment, in a case where the difference is smaller than zero and an absolute value thereof is larger than a preset duty ratio step threshold, the step-down of the latest stored reference voltage and the step-down result of the latest stored reference voltage as the reference voltage includes:
s312, under the condition that the difference value is smaller than zero and the absolute value of the difference value is larger than the preset duty ratio stepping threshold value, acquiring the latest stored reference voltage and the correction quantity of the reference voltage;
and S314, determining the reference voltage according to the difference between the newly stored reference voltage and the reference voltage value correction quantity.
In this embodiment, the meaning of the reference voltage value correction is similar to that in the above embodiment, and the process of determining the reference voltage is also similar to that in the above embodiment, and the specific process may refer to the above embodiment, and is not repeated herein.
In the above embodiment, when the difference is smaller than zero and the absolute value of the difference is greater than the preset duty ratio step threshold, the difference between the latest stored reference voltage and the correction amount of the reference voltage is calculated, and then the value of the latest stored reference voltage is adjusted downward, so as to determine the reference voltage, that is, obtain a more accurate value of the reference voltage, and improve the accuracy of adjusting the voltage output by the power factor correction circuit.
In one embodiment, the step of obtaining the output voltage, the input current and the input voltage of the power factor correction circuit further comprises:
s402, sampling the output voltage of the direct-current voltage conversion circuit;
the output voltage of the dc voltage converting circuit is the output voltage after the dc voltage converting circuit performs the step-down or step-up processing, and is used for supplying power to the load.
S404, calculating the absolute value of the difference value between the output voltage of the direct-current voltage conversion circuit and the preset output voltage;
the preset output voltage is an ideal output voltage of the direct-current voltage conversion circuit and is used for representing the ideal output voltage output by the direct-current voltage conversion circuit when loss is not counted under preset input data. Further, the preset output voltage may be set according to the amount of load connected, which is not limited herein.
S406, comparing the absolute value with a preset voltage threshold;
the preset voltage threshold is a preset value used for measuring whether the output voltage is within the target range of the ideal output voltage. For example, when the absolute value of the difference between the output voltage of the dc voltage conversion circuit and the preset output voltage is greater than or less than the preset voltage threshold, it is determined that the output voltage is not within the target range, and it should be noted that the preset voltage threshold may also be set according to the actual accuracy requirement.
And S408, under the condition that the accumulated times of the absolute value greater than the preset voltage threshold is greater than the preset times, the step of acquiring the output voltage, the input current and the input voltage of the power factor correction circuit is carried out.
The statistics of the accumulated times is used for representing whether the output voltage of the direct current voltage conversion circuit is stable, that is, in the process of sampling the output voltage of the direct current voltage conversion circuit for multiple times, the times of the output voltage in the target range of the ideal output voltage is greater than the preset times, which indicates that the output voltage of the direct current voltage conversion circuit is stable.
In the above embodiment, the number of times that the output voltage is within the target range of the ideal output voltage is counted, so as to determine whether the output voltage of the dc voltage conversion circuit is stable, and adjust the power supply voltage after the output voltage is stable, thereby ensuring the effectiveness and accuracy of the adjustment.
In one embodiment, the method further comprises:
s502, if the accumulated times of the absolute value less than the preset voltage threshold is less than or equal to the preset times, the following steps are executed until the accumulated times of the absolute value greater than the preset voltage threshold is greater than the preset times.
It can be known from the foregoing embodiment that, the cumulative number of times that the absolute value is smaller than the preset voltage threshold is smaller than or equal to the preset number of times means that the output voltage of the dc voltage conversion circuit is in an unstable state, at this time, the output voltage of the dc voltage conversion circuit needs to be adjusted first, and the power supply voltage adjustment is performed on the premise that the output voltage is stable, that is, the power supply voltage adjustment is started when the cumulative number of times that the absolute value is greater than the preset voltage threshold is greater than the preset number of times.
S504, acquiring the output voltage of the direct current voltage conversion circuit;
s506, determining a reference voltage according to the output voltage of the direct-current voltage conversion circuit, a preset output voltage, the turn ratio of a primary side coil and a secondary side coil of the direct-current voltage conversion circuit and a first duty ratio;
the output voltage, the preset output voltage and the first duty ratio of the dc voltage converting circuit may refer to the description in the above embodiments, and are not described herein again. The meaning of the turns ratio between the primary winding and the secondary winding of the dc voltage converting circuit is well known to those skilled in the art and will not be described herein.
Specifically, after the above data is acquired, the reference voltage is determined by the following formula (1):
V pfc =(V out +2*V d )/[2*(N p /N s )*D th ] （1）
wherein, V pfc Is a reference voltage; v out Presetting output voltage for the direct current voltage conversion circuit; v d Is the output voltage of the DC voltage conversion circuit, N p /N s The turn ratio of a primary coil and a secondary coil of the direct-current voltage conversion circuit is set; d th Is a first duty cycle.
And S508, acquiring the output voltage, the input current, the input voltage and the reference voltage of the power factor correction circuit, and adjusting the second pulse width modulation signal to stabilize the output voltage of the power factor correction circuit.
Specifically, in this embodiment, the meaning of the second pwm signal can refer to the description in the above embodiment, and the adjusting process of the second pwm signal and the adjusting process of the output voltage of the pfc circuit can also refer to the description in the above embodiment, and are not described herein again.
In the above embodiment, when the output voltage of the dc voltage conversion circuit is unstable, the output voltage is adjusted first, and the power supply voltage is adjusted only when the output voltage is stable, so as to ensure the validity and accuracy of the power supply voltage adjustment.
In one embodiment, the method further comprises:
s602, acquiring the output voltage of the direct current voltage conversion circuit;
s604, calculating the absolute value of the difference value between the output voltage of the direct current voltage conversion circuit and a preset output voltage;
s606, comparing the absolute value with a preset voltage threshold;
s608, when the absolute value is smaller than the preset voltage threshold, the method steps of adjusting the power supply voltage in the above embodiment are executed in a loop until the absolute value is larger than the preset voltage threshold.
The description of the parameters in this embodiment may refer to the description in the above embodiments, and is not repeated herein. Specifically, after the output voltage of the power factor correction circuit is adjusted based on the power supply voltage adjusting method, the output voltage of the direct current voltage conversion circuit is monitored, a monitoring result is fed back to the control circuit, and when the absolute value is smaller than the preset voltage threshold, the method steps of power supply voltage adjustment in the above embodiment are executed in a circulating manner until the absolute value is larger than the preset voltage threshold, so that the power supply voltage adjustment is more accurate.
To describe the aspects of the present application in more detail, the following description is made in conjunction with specific circuit structures and software program implementing logic of the rectified power supply. As shown in fig. 7 and fig. 8 a-8 c.
The control loop in fig. 7 is described below by taking an a-phase in three-phase alternating current as an example, ua, ub, and uc are three-phase input voltages of the mains supply, where ua is the a-phase input voltage, ucomp is a voltage loop calculation link, icomp is a current loop calculation link, where a diamond link identified by a diode is a rectification link, and where a link identified by a sawtooth wave is a sawtooth wave modulation link. STEP is a STEP amplitude limiting link, which functions to output a normal number when the input is larger than the preset duty ratio STEP threshold, and output a negative constant when the input is smaller than the preset duty ratio STEP, otherwise, the output is zero. Hs1 is an input voltage sampling coefficient, and an input voltage signal | ua | is obtained through sampling and rectification. Hs is an input current sampling coefficient, ia is an input current, and | ia | is obtained through sampling and rectification. D is the duty ratio of a DC-DC phase-shifted full-bridge circuit transmitted to a main control chip of the PFC circuit by the DC voltage conversion circuit, dref is the duty ratio of the highest efficiency point, and (Dref-D) is the input of the stepping amplitude limiting link STEP, and the difference between Vref and the output of the stepping amplitude limiting link STEP is used as the reference voltage of the voltage ring Ucomp. Vbus is the output voltage, and Kv is the output voltage sampling coefficient. The output voltage sample result and Vref are input as a voltage loop Ucomp. The output of the voltage loop Ucomp is multiplied by the input voltage signal | ua | to obtain the input current reference signal. The input current reference signal and the input current sampling | ia | are operated by a current loop Icomp to output a PFC duty ratio PIout, and the value of the PIout is modulated by a triangular wave to form a PWM signal for driving an MOS tube of a PFC circuit.
Specifically, as shown in fig. 8a to 8c, the logic is implemented as follows:
(1): starting the process;
(2): initializing variables, namely clearing all variable reference voltage Vref, output voltage Vout of a DC/DC circuit, preset output voltage Vset of the DC/DC circuit, output voltage Vbus of a PFC circuit, accumulated times Tcount and PWM value;
(3): according to a set sampling frequency f, sampling input voltage Va, input current Ia and bus voltage Vbus (namely the output voltage of an FPC (flexible printed circuit)) of a current PFC circuit and output voltage Vout of a DC/DC circuit;
(4): judging whether the output voltage of the DC/DC circuit reaches a preset output voltage and keeps stable for a period of time, if so, switching in a power supply voltage regulation mode for dynamically regulating the output voltage of the FPC circuit according to the duty ratio of the DC-DC circuit, and if not, keeping a linear bus voltage regulation mode, namely, regulating based on the formula (1) of the embodiment;
(5): calculating a reference voltage Vref according to a voltage regulation formula (1) according to a preset output voltage Vout of a DC/DC circuit, a duty ratio theoretical value Dth, a turn ratio Np/Ns of a primary coil and a secondary coil of a direct current voltage conversion circuit and an output voltage Vd of the direct current voltage conversion circuit;
(6) And (9): comparing Vref with an allowed bus voltage maximum value Vmax, and taking the Vref as Vmax if the Vref is larger than the Vmax;
(7) And (10): comparing Vref with an allowed bus voltage minimum value Vmin, and taking the Vref as Vmin if the Vref is smaller than Vmin;
(8): calculating the Vref value through a voltage ring and a current ring to obtain a duty ratio PWM value of an MOS (metal oxide semiconductor) tube in the PFC, and modulating the PWM value to form a driving PWM signal of a switching tube;
(11) - (12): when the difference between Vset and Vout is less than a constant Verr (i.e., a predetermined voltage threshold), the count value Tcount is incremented by a time for the recording output voltage to remain stable, otherwise Tcount is unchanged.
(13): the duty cycle (i.e., the first duty cycle) of the DC-DC circuit, the last beat bus voltage Vbus, and the last beat reference voltage Vref are read. Sampling input voltage ua and input current ia;
(14) - (18): calculating the difference value between the DC-DC duty ratio and the duty ratio (namely the expected duty ratio) at the highest efficiency point, if the difference value is positive and is greater than a preset duty ratio stepping threshold Dset, increasing a reference voltage correction amount Vdelta on the Vref of the previous beat by the Vref, and if the difference value is negative and the absolute value of the difference value is greater than the Dset, reducing the reference voltage correction amount Vdelta on the Vref of the previous beat by the Vref;
(19): the bus voltage reference value Vref and the bus voltage Vbus are voltage loop input, and the voltage loop output is Vo;
(20): multiplying the voltage loop output Vo by the absolute value | ua | of the input voltage sample to obtain an input current reference signal;
(21): the absolute value | ia | of the input current reference signal and the input current sampling is the input of a current loop, and the output of the current loop is the duty ratio PWM of an MOS tube in the PFC;
(22): the duty ratio value is modulated by triangular waves to form an MOS tube driving signal of the PFC;
(23): when the absolute value of the difference between the output voltage set value and the output voltage sampling is not greater than Verr, the control circuit continues to circularly execute the mode of carrying out bus voltage regulation according to the DC-DC duty ratio;
(24): when the output voltage set value and the output voltage sampling value are greater than Verr, the Tcount is cleared, and the module is switched to a mode of regulating the power supply voltage according to the formula (1);
(25): flow ends (due to shutdown of module, etc.)
In the above embodiment, the output voltage of the PFC circuit is dynamically regulated and controlled by detecting the difference between the duty cycle of the DC/DC circuit and the duty cycle of the maximum efficiency point, so that the DC-DC duty cycle is kept stable, the efficiency of the whole rectification power supply in a wide input and output voltage range is improved, and the problem of insufficient output capacity is avoided. Furthermore, the regulation mode is switched in after the rectification power supply is started to operate stably, so that the regulation accuracy and effectiveness are ensured.
It should be understood that, although the steps in the flowcharts related to the embodiments as described above are sequentially displayed as indicated by arrows, the steps are not necessarily performed sequentially as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a part of the steps in the flowcharts related to the embodiments described above may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the execution order of the steps or stages is not necessarily sequential, but may be rotated or alternated with other steps or at least a part of the steps or stages in other steps.
Based on the same inventive concept, the embodiment of the present application further provides a power supply voltage adjusting apparatus for implementing the power supply voltage adjusting method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the method, so the specific limitations in one or more embodiments of the power supply voltage regulating device provided below can be referred to the limitations of the power supply voltage regulating method in the above, and are not described herein again.
In one embodiment, as shown in fig. 9, there is provided a power supply voltage adjusting apparatus including:
a duty ratio determining module 902, configured to obtain a first pulse width modulation signal loaded at a controlled end of the dc voltage converting circuit, and determine a first duty ratio of the first pulse width modulation signal;
a data obtaining module 904, configured to obtain an output voltage, an input current, and an input voltage of the power factor correction circuit;
a difference calculation module 906 for calculating a difference between the first duty cycle and the desired duty cycle; when the expected duty ratio is the highest conversion efficiency of the direct-current voltage conversion circuit, the duty ratio of a pulse width modulation signal loaded at the controlled end of the direct-current voltage conversion circuit;
a first reference voltage determination module 908 for determining a reference voltage based on the difference;
the adjusting module 910 is configured to adjust a second duty ratio of the second pwm signal according to the reference voltage and the output voltage, the input current, and the input voltage of the pfc circuit to adjust the voltage output by the pfc circuit;
the second pulse width modulation signal is a signal loaded on the controlled end of the power factor correction circuit.
In one embodiment, the first reference voltage determining module 908 includes:
a duty ratio stepping threshold value obtaining unit for obtaining a preset duty ratio stepping threshold value;
and the first adjusting unit is used for adjusting the latest stored reference voltage in an up-regulation mode under the condition that the difference value is larger than zero and larger than a preset duty ratio stepping threshold value, and taking the up-regulation result of the latest stored reference voltage as the reference voltage.
In one embodiment, the first adjusting unit includes:
the first data acquisition unit is used for acquiring the latest stored reference voltage and the latest stored reference voltage correction quantity under the condition that the difference value is larger than zero and larger than a preset duty ratio stepping threshold value;
and a first reference voltage determining unit for determining the reference voltage from the sum of the reference voltage stored last and the reference voltage value correction amount.
In one embodiment, the first reference voltage determining module 908 further includes:
a duty ratio stepping threshold value obtaining unit for obtaining a preset duty ratio stepping threshold value;
and the second adjusting unit is used for adjusting the latest stored reference voltage downwards under the condition that the difference value is less than zero and the absolute value of the difference value is greater than the preset duty ratio stepping threshold value, and taking the adjustment result of the latest stored reference voltage as the reference voltage.
In one embodiment, the second adjusting unit includes:
the second data acquisition unit is used for acquiring the latest stored reference voltage and reference voltage correction quantity under the condition that the difference value is smaller than zero and the absolute value of the difference value is larger than the preset duty ratio stepping threshold value;
and a second reference voltage determining unit for determining the reference voltage from a difference between the reference voltage newly stored and the reference voltage value correction amount.
In one embodiment, the power supply voltage regulator further includes:
the sampling module is used for sampling the output voltage of the direct-current voltage conversion circuit;
the absolute value calculation module is used for calculating the absolute value of the difference value between the output voltage of the direct-current voltage conversion circuit and the preset output voltage;
the comparison module is used for comparing the absolute value with a preset voltage threshold;
and the first execution module is used for entering the step of acquiring the output voltage, the input current and the input voltage of the power factor correction circuit under the condition that the accumulated times that the absolute value is greater than the preset voltage threshold is greater than the preset times.
In one embodiment, the power supply voltage regulator further includes:
a second execution module, configured to, when the number of times that the absolute value is smaller than the preset voltage threshold is smaller than or equal to the preset number, execute the following steps until the number of times that the absolute value is larger than the preset voltage threshold is larger than the preset number:
the output voltage acquisition module is used for acquiring the output voltage of the direct current voltage conversion circuit;
the second reference voltage determining module is used for determining a reference voltage according to the output voltage of the direct current voltage conversion circuit, the preset output voltage, the turn ratio of the primary coil and the secondary coil of the direct current voltage conversion circuit and the first duty ratio;
and the voltage stabilizing module is used for acquiring the output voltage, the input current, the input voltage and the reference voltage of the power factor correction circuit and regulating the second pulse width modulation signal so as to stabilize the output voltage of the power factor correction circuit.
In one embodiment, the power supply voltage regulator further includes:
the output voltage acquisition module is used for acquiring the output voltage of the direct current voltage conversion circuit;
the absolute value calculation module is used for calculating the absolute value of the difference value of the output voltage of the direct current voltage conversion circuit and the preset output voltage;
the comparison module is used for comparing the absolute value with a preset voltage threshold;
and a third execution module, configured to execute the method steps for adjusting the power supply voltage in the foregoing embodiment in a loop when the absolute value is smaller than the preset voltage threshold until the absolute value is larger than the preset voltage threshold.
The modules in the power supply voltage regulating device can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as shown in fig. 10. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used to store supply voltage adjustment data. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method of supply voltage regulation.
Those skilled in the art will appreciate that the architecture shown in fig. 10 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a control circuit is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the steps of the above method embodiments when executing the computer program.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
In an embodiment, a computer program product is provided, comprising a computer program which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, databases, or other media used in the embodiments provided herein can include at least one of non-volatile and volatile memory. The nonvolatile Memory may include a Read-Only Memory (ROM), a magnetic tape, a floppy disk, a flash Memory, an optical Memory, a high-density embedded nonvolatile Memory, a resistive Random Access Memory (ReRAM), a Magnetic Random Access Memory (MRAM), a Ferroelectric Random Access Memory (FRAM), a Phase Change Memory (PCM), a graphene Memory, and the like. Volatile Memory can include Random Access Memory (RAM), external cache Memory, and the like. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others. The databases referred to in various embodiments provided herein may include at least one of relational and non-relational databases. The non-relational database may include, but is not limited to, a block chain based distributed database, and the like. The processors referred to in the various embodiments provided herein may be, without limitation, general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, or the like.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.
Claims (10)
1. A power supply voltage regulating method, applied to a control circuit in a rectified power supply, wherein the rectified power supply includes a power factor correction circuit, a dc voltage converting circuit and a control circuit, an input terminal of the power factor correction circuit is used for accessing a power supply network, an output terminal of the power factor correction circuit is connected with an input terminal of the dc voltage converting circuit, an input terminal of the control circuit is connected with a controlled terminal of the dc voltage converting circuit, an input terminal of the power factor correction circuit and an output terminal of the power factor correction circuit, and a control terminal of the control circuit is connected with the controlled terminal of the power factor correction circuit, the method comprising:
acquiring a first pulse width modulation signal loaded at a controlled end of the direct current voltage conversion circuit, and determining a first duty ratio of the first pulse width modulation signal;
acquiring output voltage, input current and input voltage of the power factor correction circuit;
calculating a difference between the first duty cycle and a desired duty cycle; the expected duty ratio is the duty ratio of a pulse width modulation signal loaded at the controlled end of the direct current voltage conversion circuit when the conversion efficiency of the direct current voltage conversion circuit is the highest;
determining a reference voltage according to the difference value;
adjusting a second duty ratio of a second pulse width modulation signal according to the reference voltage and the output voltage, the input current and the input voltage of the power factor correction circuit so as to adjust the voltage output by the power factor correction circuit;
the second pulse width modulation signal is a signal loaded on the controlled end of the power factor correction circuit.
2. The method of claim 1, wherein determining a reference voltage from the difference comprises:
acquiring a preset duty ratio stepping threshold;
and under the condition that the difference value is larger than zero and larger than the preset duty ratio stepping threshold value, the latest stored reference voltage is adjusted upwards, and the adjustment result of the latest stored reference voltage is used as the reference voltage.
3. The method of claim 2, wherein the step-up of the latest stored reference voltage and the step-up of the latest stored reference voltage as the reference voltage if the difference is greater than zero and greater than the preset duty cycle step threshold comprises:
acquiring the latest stored reference voltage and reference voltage correction quantity under the condition that the difference value is larger than zero and larger than the preset duty ratio stepping threshold value;
the reference voltage is determined by the sum of the most recently stored reference voltage and the reference voltage value modifier.
4. The method of claim 1, wherein determining a reference voltage based on the difference comprises:
acquiring a preset duty ratio stepping threshold;
and under the condition that the difference value is smaller than zero and the absolute value of the difference value is larger than the preset duty ratio stepping threshold value, the latest stored reference voltage is adjusted downwards, and the adjustment result of the latest stored reference voltage is used as the reference voltage.
5. The method of claim 4, wherein the step-down of the latest stored reference voltage and the step-down of the latest stored reference voltage as the reference voltage in the case that the difference is smaller than zero and the absolute value of the difference is larger than the preset duty cycle step threshold comprises:
under the condition that the difference value is smaller than zero and the absolute value of the difference value is larger than the preset duty ratio stepping threshold value, acquiring the latest stored reference voltage and reference voltage correction quantity;
the reference voltage is determined from the difference between the most recently stored reference voltage and the reference voltage value correction amount.
6. The method of claim 1, wherein the step of obtaining the output voltage, the input current, and the input voltage of the pfc circuit is preceded by the step of:
sampling the output voltage of the direct current voltage conversion circuit;
calculating the absolute value of the difference value between the output voltage of the direct-current voltage conversion circuit and a preset output voltage;
comparing the absolute value with a preset voltage threshold;
and under the condition that the accumulated times that the absolute value is greater than the preset voltage threshold is greater than the preset times, the step of obtaining the output voltage, the input current and the input voltage of the power factor correction circuit is carried out.
7. The method of claim 6, further comprising:
if the accumulated times that the absolute value is smaller than the preset voltage threshold is smaller than or equal to the preset times, executing the following steps until the accumulated times that the absolute value is larger than the preset voltage threshold is larger than the preset times:
acquiring the output voltage of the direct-current voltage conversion circuit;
determining the reference voltage according to the output voltage of the direct-current voltage conversion circuit, the preset output voltage, the turn ratio of a primary coil and a secondary coil of the direct-current voltage conversion circuit and the first duty ratio;
and acquiring the output voltage, the input current, the input voltage and the reference voltage of the power factor correction circuit, and adjusting the second pulse width modulation signal to stabilize the output voltage of the power factor correction circuit.
8. The method of claim 1, further comprising:
acquiring the output voltage of the direct-current voltage conversion circuit;
calculating the absolute value of the difference value between the output voltage of the direct-current voltage conversion circuit and a preset output voltage;
comparing the absolute value with a preset voltage threshold;
when the absolute value is smaller than the preset voltage threshold, the method steps of claim 1 are executed in a loop until the absolute value is larger than the preset voltage threshold.
9. A rectified power supply, comprising a power factor correction circuit, a dc voltage conversion circuit and a control circuit, wherein an input terminal of the power factor correction circuit is used for accessing a power supply network, an output terminal of the power factor correction circuit is connected with an input terminal of the dc voltage conversion circuit, an input terminal of the control circuit is connected with a controlled terminal of the dc voltage conversion circuit, an input terminal of the power factor correction circuit and an output terminal of the power factor correction circuit, a control terminal of the control circuit is connected with the controlled terminal of the power factor correction circuit, and the control circuit is used for executing the power supply voltage regulation method according to any one of claims 1 to 8.
10. A control circuit comprising a memory and a processor, the memory storing a computer program, characterized in that the processor realizes the steps of the method of any one of claims 1 to 8 when executing the computer program.
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Address after: 511458 room 409-a156, a157, No. 1, Mingzhu 1st Street, Hengli Town, Nansha District, Guangzhou City, Guangdong Province Patentee after: China Southern Power Grid Industry Investment Group Co.,Ltd. Patentee after: Southern Power Grid Electric Vehicle Service Co.,Ltd. Patentee after: Yonglian Technology (Changshu) Co.,Ltd. Address before: 511458 room 409-a156, a157, No. 1, Mingzhu 1st Street, Hengli Town, Nansha District, Guangzhou City, Guangdong Province Patentee before: China Southern Power Grid Industry Investment Group Co.,Ltd. Patentee before: Southern Power Grid Electric Vehicle Service Co.,Ltd. Patentee before: Yonglian smart energy technology (Changshu) Co.,Ltd. |
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