CN213754319U - Low-cost power factor correction control circuit and driving power supply - Google Patents

Low-cost power factor correction control circuit and driving power supply Download PDF

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CN213754319U
CN213754319U CN202022490613.1U CN202022490613U CN213754319U CN 213754319 U CN213754319 U CN 213754319U CN 202022490613 U CN202022490613 U CN 202022490613U CN 213754319 U CN213754319 U CN 213754319U
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capacitor
power factor
circuit
factor correction
switch tube
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宋祖梅
陈圣伦
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Anhui Letu Electronic Technology Co ltd
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Anhui Letu Electronic Technology Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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Abstract

The utility model discloses a low-cost power factor correction control circuit and drive power supply, this circuit includes electric wire netting input Vin, rectifier bridge DB1, electric capacity C1, electric capacity C2, switch tube S1, switch tube S2, switch tube S3, diode D1, inductance L1, resistance R1, transformer T1, first output rectifier circuit, output electric capacity Co, power factor correction control circuit and resonance control drive circuit. Has the advantages that: the utility model can prevent the overstress of the circuit device and realize the power factor correction function; the utility model discloses a control circuit and drive power supply are rectified to low-cost power factor, the circuit is simple, and control is convenient, compares in two-stage circuit, and circuit cost is lower, compares in passive charge pump PFC, can compromise generating line appearance voltage and power factor well, can be applicable to the input and the output load scope of broad.

Description

Low-cost power factor correction control circuit and driving power supply
Technical Field
The utility model relates to a circuit and drive power supply technical field particularly, relate to a low-cost power factor correction control circuit and drive power supply.
Background
In the field of power supplies, a driving power supply with high power density, high efficiency and low cost is more competitive. Usually, the driving power source selects a resonant circuit to achieve the objectives of high power density and high efficiency. The resonant circuit can realize zero voltage switching-on of two or more switching tubes on the primary side and zero current switching-off of the secondary side rectifier diode, can reduce the switching loss of a power supply, and improves the efficiency and the power density of the power converter. Meanwhile, in order to improve the power factor, a primary active PFC power factor correction circuit is often added at a front stage of the resonant circuit, but this results in a complex circuit and high cost.
Therefore, in the prior art, a charge pump circuit replaces a PFC (Power Factor Correction) circuit, so that a single-stage resonant circuit meets the Power Factor requirement. However, the resonant circuit having the charge pump has the following problems: when the circuit is under the working condition that the amplitude of the input voltage is changed within a certain range, when the amplitude of the input voltage is increased and the energy required by the resonance main circuit is unchanged, the voltage on the bus capacitor is immediately increased; or, when the output power of the resonant main circuit changes within a certain range (i.e. the power required by the resonant main circuit changes within a certain range), the output power decreases and the input voltage does not change, and the voltage on the bus capacitor increases immediately. If the voltage on the bus capacitor is at a higher amplitude level, the related devices of the later stage resonant main circuit need to bear higher voltage stress. Therefore, when designing the circuit, these devices of the resonant main circuit need to select the withstand voltage performance according to the bus capacitor voltage of the highest magnitude. The devices with high voltage resistance are expensive, and for circuits which work under low-amplitude bus capacitor voltage for a long time and occasionally work under high-amplitude bus capacitor voltage, the devices with high voltage resistance are selected to be too wasteful and must be selected, otherwise, the devices can be damaged due to voltage resistance under the high-amplitude bus capacitor voltage.
Meanwhile, the charge pump PFC is used as a passive measure, so that ideal power factor correction is difficult to realize in a wider input and load range, and the power factor and harmonic effect are not ideal.
In view of this, a technical problem to be solved by those skilled in the art is to stably limit the voltage of the bus capacitor to a certain voltage value, to avoid voltage stress on the device due to the overhigh voltage of the bus capacitor, and to achieve better power factor correction in a wider input and load range.
An effective solution to the problems in the related art has not been proposed yet.
SUMMERY OF THE UTILITY MODEL
To the problem among the correlation technique, the utility model provides a low-cost power factor correction control circuit and drive power supply to overcome the above-mentioned technical problem that current correlation technique exists.
Therefore, the utility model discloses a specific technical scheme as follows:
according to an aspect of the utility model, a low-cost power factor correction control circuit is provided, this low-cost power factor correction control circuit includes electric wire netting input Vin, rectifier bridge DB1, electric capacity C1, electric capacity C2, switch tube S1, switch tube S2, switch tube S3, diode D1, inductance L1, resistance R1, transformer T1, first output rectifier circuit, output electric capacity Co, power factor correction control circuit and resonance control drive circuit; the grid input Vin is connected to the first end and the third end of the rectifier bridge DB1, the second end of the rectifier bridge DB1 is sequentially connected to the positive electrode of the capacitor C1 and the first end of the switch tube S1, the second end of the switch tube S1 is sequentially connected to one end of the resistor R1 and the first end of the switch tube S2, the other end of the resistor R1 is connected to one end of the inductor L1, the other end of the inductor L1 is connected to the first input end of the transformer T1, the second input end of the transformer T1 is connected to one end of the capacitor C2, the output end of the transformer T1 is connected to the first output rectifying circuit in parallel, the first output rectifying circuit is connected to the output capacitor Co in parallel, the other end of the capacitor C2 is sequentially connected to the first end of the switch tube S3, the negative electrode of the diode D1 and the fourth end of the rectifier bridge DB1, and the positive electrode of the diode D1 is sequentially connected to the negative electrode of the capacitor C1, The second end of the switch tube S3 and the second end of the switch tube S2 are connected and grounded, the power factor correction control circuit is connected with the third end of the switch tube S3, the first end of the resonance control driving circuit is connected with the third end of the switch tube S1, and the second end of the resonance control driving circuit is connected with the third end of the switch tube S2;
the power factor correction control circuit controls the conduction time of the switch tube S3, and can limit and stabilize the voltage of the capacitor C1; when the current of the inductor L1 flows in the positive half cycle, the conduction time of the switch tube S3 is controlled, the current which is supplied to the capacitor C1 through the rectifier bridge DB1 and the input power grid Vin can be controlled, the longer the conduction time of the switch tube S3 is, the smaller the current which is charged to the capacitor C1 is, and on the contrary, the shorter the conduction time of the switch tube S3 is, the larger the current which is charged to the capacitor C1 is; when the on-time of the switch tube S3 is at a certain value, the charging and discharging currents of the capacitor C1 are equal, and the voltage of the capacitor C1 is at a steady state;
the power factor correction control circuit controls and modulates the conduction time and the conduction duty ratio of the switching tube S3 according to the input power grid voltage, so that the average value of the current flowing through the rectifier bridge DB1 and the power grid tracks the input power grid voltage in a power frequency period, and the power factor correction function is realized;
the power factor correction control circuit samples a Vir signal, a steamed bread wave voltage Vin _ rec signal obtained by rectifying the power grid Vin, and a bus capacitor voltage Vbus, and realizes the limiting and stable control of the bus voltage C1 and the power factor correction function of the power grid by adopting a double-loop control mode of average current control of an outer loop and an inner loop of a voltage loop.
Further, the capacitor C1 is a polar capacitor.
Further, the capacitor Co is a polar capacitor.
According to another aspect of the present invention, there is provided a driving power supply comprising the above low-cost power factor correction control circuit.
The utility model has the advantages that:
the utility model discloses a control circuit and drive power supply are rectified to low-cost power factor, through the on-time of controlling active switch pipe S3, restriction and the voltage of having stabilized bus capacitance C1 prevent the overstress of circuit device. Meanwhile, the input power grid current is sampled, a double-loop average current control mode is adopted, and the input current tracks the input power grid voltage by controlling the conduction time of the active switching tube S3, so that the power factor correction function is realized. The utility model discloses a control circuit and drive power supply are rectified to low-cost power factor, and the circuit is simple, and control is convenient. Compared with a two-stage circuit, the circuit has lower cost. Compared with a passive charge pump PFC, the method can well give consideration to bus capacitance voltage and power factors, and can be suitable for a wider input and output load range.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a first embodiment;
FIG. 2 is a voltage waveform diagram of the first embodiment
FIG. 3 is a partial schematic view of FIG. 1;
FIG. 4 is a schematic view of the second embodiment;
FIG. 5 is a voltage waveform diagram of the second embodiment;
FIG. 6 is a schematic diagram of the power factor correction control circuit of FIG. 4;
fig. 7 is a voltage waveform diagram of fig. 6.
Detailed Description
For further explanation of the embodiments, the drawings are provided as part of the disclosure and serve primarily to illustrate the embodiments and, together with the description, to explain the principles of operation of the embodiments, and to provide further explanation of the invention and advantages thereof, it will be understood by those skilled in the art that various other embodiments and advantages of the invention are possible, and that elements in the drawings are not to scale and that like reference numerals are generally used to designate like elements.
According to the utility model discloses an embodiment provides a low-cost power factor correction control circuit and drive power supply.
Example one
Referring now to the drawings and the detailed description, as shown in fig. 1-3, according to the embodiment of the present invention, a low-cost power factor correction control circuit includes a power grid input Vin, a rectifier bridge DB1, a capacitor C1, a capacitor C2, a switch tube S1, a switch tube S2, a switch tube S3, a diode D1, an inductor L1, a resistor R1, a transformer T1, a first output rectifier circuit, an output capacitor Co, a power factor correction control circuit, and a resonance control driving circuit; the grid input Vin is connected to the first end and the third end of the rectifier bridge DB1, the second end of the rectifier bridge DB1 is sequentially connected to the positive electrode of the capacitor C1 and the first end of the switch tube S1, the second end of the switch tube S1 is sequentially connected to one end of the resistor R1 and the first end of the switch tube S2, the other end of the resistor R1 is connected to one end of the inductor L1, the other end of the inductor L1 is connected to the first input end of the transformer T1, the second input end of the transformer T1 is connected to one end of the capacitor C2, the output end of the transformer T1 is connected to the first output rectifying circuit in parallel, the first output rectifying circuit is connected to the output capacitor Co in parallel, and the other end of the capacitor C2 is sequentially connected to the first end of the switch tube S3, the negative electrode of the diode D1 and the fourth end of the rectifier bridge DB1, the anode of the diode D1 is sequentially connected to the cathode of the capacitor C1, the second terminal of the switch tube S3, and the second terminal of the switch tube S2, and is grounded, the power factor correction control circuit is connected to the third terminal of the switch tube S3, the first terminal of the resonance control driving circuit is connected to the third terminal of the switch tube S1, and the second terminal of the resonance control driving circuit is connected to the third terminal of the switch tube S2.
In one embodiment, the capacitor C1 is a polar capacitor.
In one embodiment, the capacitor Co is a polar capacitor.
In one embodiment, the resonance control driving circuit performs feedback control to obtain a desired output voltage Vo and current Io; the power factor correction control circuit controls the voltage of the stabilizing capacitor C1 in a feedback mode, and the power factor correction function is achieved.
In one embodiment, when the current of the inductor L1 flows from right to left in a negative half cycle, the diode D1 is turned on, the rectifier bridge DB1 is turned off, and the current does not pass through the input grid Vin.
In one embodiment, when the current of the inductor L1 flows from left to right in a positive half cycle, if the switching tube S3 is turned on, the rectifier bridge DB1 is turned off, and the current does not pass through the input grid Vin.
In one embodiment, when the current of the inductor L1 flows from left to right in a positive half cycle, if the switch tube S3 is turned off, the rectifier bridge DB1 is turned on, and the current passes through the input grid Vin.
In one embodiment, the resonant control drive circuit supplies energy to the output capacitor and the load through the transformer via the first output rectifier circuit.
In one embodiment, the resonant control driving circuit adopts frequency feedback control of the output voltage and the output current, the control mode of the resonant control driving circuit is similar to that of a common series resonant and series-parallel resonant circuit, the switching tube S1 and the switching tube S2 are symmetrically and complementarily driven, and the set output voltage Vo and the set output current Io are obtained through frequency control.
The utility model also provides a drive power supply, this drive power supply comprises above-mentioned low-cost power factor correction control circuit.
In one embodiment, when the switching tube S3 is in a continuous conduction state, the input voltage is input to the grid Vin, the rectifier bridge DB1 and the capacitor C1 to form an uncontrolled rectifier circuit, and no power factor correction function is provided, at this time, the working voltage of the capacitor C1 is the lowest, and the grid current harmonic is also large; the positive half-cycle resonant current of the inductor L1 is input into the power grid Vin through the rectifier bridge DB1, and the capacitor C1 is charged. The current flowing through the switching tube S1 is necessarily smaller than the positive half-cycle current of the inductor L1, so that the charging current is always larger than the discharging current, and the voltage of the capacitor C1 rises all the time until the device is damaged; as shown in fig. 2 and fig. 3, the power factor correction control circuit controls the on-time of the switch transistor S3, so as to limit and stabilize the voltage of the capacitor C1. When the current of the inductor L1 flows in the positive half cycle, the on-time of the switch tube S3 is controlled, so that the current supplied to the capacitor C1 through the rectifier bridge DB1 and the input grid Vin can be controlled, the longer the on-time of the switch tube S3 is, the smaller the current supplied to the capacitor C1 is, and conversely, the shorter the on-time of the switch tube S3 is, the larger the current supplied to the capacitor C1 is. When the on-time of the switch tube S3 is at a certain value, the charging and discharging currents of the capacitor C1 are equal, and the voltage of the capacitor C1 is in a steady state. Therefore, the on-time of the switch tube S3 is controlled to limit and stabilize the voltage of the capacitor C1, thereby avoiding overstressing the circuit device.
In one embodiment, the power factor correction control circuit controls and modulates the conduction time and the conduction duty ratio of the switching tube S3 according to the input power grid voltage, so that the average value of the current flowing through the rectifier bridge DB1 and the power grid tracks the input power grid voltage in the power frequency period, the power factor correction function is realized, the power factor is improved, and the current harmonic is reduced.
In one embodiment, the power factor correction control circuit samples a Vir signal, a steamed bread wave voltage Vin _ rec signal obtained by rectifying the power grid Vin, and a bus capacitor voltage Vbus, and realizes the limiting and stable control of a bus voltage C1 and the power factor correction function of the power grid by adopting a double-loop control mode of average current control of an outer loop and an inner loop of a voltage loop.
Example two
As shown in fig. 4, the power factor correction control circuit according to the embodiment of the present invention includes a grid input Vin, a rectifier bridge DB1, a capacitor C1, a capacitor C2, a switch tube S1, a switch tube S2, a switch tube S3, a diode D1, an inductor L1, a resistor R1, a transformer T1, a first output rectifying circuit, a second output rectifying circuit, an output capacitor Co, a power factor correction control circuit, and a resonance control driving circuit; the grid input Vin is connected to the first end and the third end of the rectifier bridge DB1, the second end of the rectifier bridge DB1 is sequentially connected to the positive electrode of the capacitor C1 and the first end of the switch tube S1, the second end of the switch tube S1 is sequentially connected to one end of the resistor R1 and the first end of the switch tube S2 and grounded, the other end of the resistor R1 is sequentially connected to the first end of the power factor correction control circuit and one end of the inductor L1, the other end of the inductor L1 is connected to the first input end of the transformer T1, the second input end of the transformer T1 is connected to one end of the capacitor C2, the output end of the transformer T1 is connected in parallel to the first output rectifying circuit, the first output rectifying circuit is connected in parallel to the output capacitor Co, and the other end of the capacitor C2 is sequentially connected to the first end of the switch tube S3, the negative electrode of the diode D1 and the fourth end of the rectifier bridge DB1, the anode of the diode D1 is sequentially connected to the cathode of the capacitor C1, the second end of the switch tube S3 and the second end of the switch tube S2, the Vg _ S3 end of the power factor correction control circuit is connected to the third end of the switch tube S3, the Vin _ rec end of the power factor correction control circuit is connected to the second output rectifying circuit, the Vg _ S1 end of the resonance control driving circuit is connected to the third end of the switch tube S1, and the Vg _ S2 end of the resonance control driving circuit is connected to the third end of the switch tube S2.
In one embodiment, see fig. 6, the voltage across the sampling resistor R1 is used as a signal to characterize the resonant current of the inductor L1. The midpoint of the connection between the switching tube S1 and the switching tube S2 is used as a sampling signal reference ground, and two voltage terminals Vir are IL 1R 1. When the inductor L1 current flows from left to right in the positive direction, the Vir signal is negative. When the inductor L1 current flows in the reverse direction from right to left, the Vir signal is positive. As shown in fig. 4, the S4 driving signal in fig. 6 is the same as the S3 driving in fig. 4. After Vir is controlled by S4 in fig. 6, the resultant signal is proportional to the input current.
In one embodiment, the power factor correction control circuit samples a Vir signal, a steamed bread wave voltage Vin _ rec signal obtained by rectifying the power grid Vin, and a bus capacitor voltage Vbus, and realizes the functions of limiting and stably controlling the bus voltage and correcting the power factor of the power grid by adopting a double-loop control mode of average current control of an outer loop and an inner loop of a voltage loop.
In one embodiment, as shown in fig. 6, the voltage-loop feedback operational amplifier output Vcomp is multiplied by Vin _ rec as the reference of the current inner loop, which is superimposed with the input current sampling signal as the non-inverting input of the current inner loop operational amplifier, and the operational amplifier output signal Icomp is compared with the signal generator signal Vt to trigger the control switch S3 to be turned on.
In one embodiment, when the current of the inductor L1 changes from positive to negative half cycles, the switch tube S3 is still in the conducting state, instead of the diode D1 conducting, so as to reduce the conducting loss. The switch tube S3 is turned off when the negative half-cycle current flowing through the switch tube S3 gradually decreases to the set comparison value.
In one embodiment, as shown in fig. 5 and 6, the Vt signal is a sawtooth signal obtained by charging the capacitor C with a fixed constant current source, and the constant current source charges the capacitor when the detected Vir signal is higher than the set comparison threshold Vth. When the Vir signal is detected to be lower than the set comparison threshold Vth, the switch connected in parallel with the capacitor is kept on, and the Vt signal is kept to be zero.
In one embodiment, as shown in fig. 6 and 7, when the Vir signal is detected to be lower than the set comparison threshold Vth and during the conduction period of the switch tube S1, i.e. when the driving signal HG is at a high level, the flip-flop latch is reset, and the switch tube S3 is turned off.
For the convenience of understanding the technical solution of the present invention, the following detailed description is made on the working principle or the operation mode of the present invention in the practical process.
In practical application, when the switch tube S1 is turned on and the switch tube S2 is turned off, and the switch tube S3 or the diode D1 is turned on, a current passes through the switch tube S1, the inductor L1, the transformer T1, the resonant capacitor C2, the switch tube S3, the diode D1 or the capacitor C1;
when the switch tube S1 turns off the switch tube S2 and turns on, and the switch tube S3 or the diode D1 turns on, the current passes through the diode S2, the inductor L1, the transformer T1, the resonant capacitor C2, the switch tube S3 or the diode D1;
when the switch tube S1 is connected and the switch tube S2 is turned off, and the switch tube S3 and the diode D1 are turned off, current passes through the switch tube S1, the inductor L1, the transformer T1, the resonant capacitor C2, the rectifier bridge DB1 and is input into a power grid Vin;
when the switch tube S1 turns off the switch tube S2 and turns on, and the switch tube S3 and the diode D1 turn off, current flows through the switch tube S1, the inductor L1, the transformer T1, the resonant capacitor C2, the rectifier bridge DB1, and is input to the grid Vin.
To sum up, the utility model discloses a control circuit and drive power supply are rectified to low-cost power factor, through the on-time of controlling active switch pipe S3, the restriction with stabilized bus capacitor C1' S voltage, prevent circuit device overstress. Meanwhile, the input power grid current is sampled, a double-loop average current control mode is adopted, and the input current tracks the input power grid voltage by controlling the conduction time of the active switching tube S3, so that the power factor correction function is realized. The utility model discloses a control circuit and drive power supply are rectified to low-cost power factor, and the circuit is simple, and control is convenient. Compared with a two-stage circuit, the circuit has lower cost. Compared with a passive charge pump PFC, the method can well give consideration to bus capacitance voltage and power factors, and can be suitable for a wider input and output load range.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (4)

1. A low-cost power factor correction control circuit is characterized by comprising a power grid input Vin, a rectifier bridge DB1, a capacitor C1, a capacitor C2, a switch tube S1, a switch tube S2, a switch tube S3, a diode D1, an inductor L1, a resistor R1, a transformer T1, a first output rectifying circuit, an output capacitor Co, a power factor correction control circuit and a resonance control drive circuit;
wherein, the grid input Vin is connected to the first end and the third end of the rectifier bridge DB1, the second end of the rectifier bridge DB1 is sequentially connected to the positive electrode of the capacitor C1 and the first end of the switch tube S1, the second end of the switch tube S1 is sequentially connected to one end of the resistor R1 and the first end of the switch tube S2, the other end of the resistor R1 is connected to one end of the inductor L1, the other end of the inductor L1 is connected to the first input end of the transformer T1, the second input end of the transformer T1 is connected to one end of the capacitor C2, the output end of the transformer T1 is connected to the first output rectifying circuit in parallel, the first output rectifying circuit is connected to the output capacitor Co in parallel, and the other end of the capacitor C2 is sequentially connected to the first end of the switch tube S3, the negative electrode of the diode D1 and the fourth end of the rectifier bridge DB1, the anode of the diode D1 is sequentially connected to the cathode of the capacitor C1, the second terminal of the switching tube S3, and the second terminal of the switching tube S2, and is grounded, the power factor correction control circuit is connected to the third terminal of the switching tube S3, the first terminal of the resonance control driving circuit is connected to the third terminal of the switching tube S1, and the second terminal of the resonance control driving circuit is connected to the third terminal of the switching tube S2;
the power factor correction control circuit controls the conduction time of the switch tube S3, and can limit and stabilize the voltage of the capacitor C1;
the power factor correction control circuit controls and modulates the conduction time and the conduction duty ratio of the switching tube S3 according to the input power grid voltage, so that the average value of the current flowing through the rectifier bridge DB1 and the power grid tracks the input power grid voltage in a power frequency period, and the power factor correction function is realized;
the power factor correction control circuit samples a Vir signal, a steamed bread wave voltage Vin _ rec signal obtained by rectifying the power grid Vin, and a bus capacitor voltage Vbus, and realizes the limiting and stable control of the bus voltage C1 and the power factor correction function of the power grid by adopting a double-loop control mode of average current control of an outer loop and an inner loop of a voltage loop.
2. The low-cost PFC control circuit as claimed in claim 1, wherein said capacitor C1 is a polar capacitor.
3. The low-cost power factor correction control circuit as claimed in claim 1, wherein said capacitor Co is a polar capacitor.
4. A driving power supply comprising a low cost power factor correction control circuit as claimed in any one of claims 1 to 3.
CN202022490613.1U 2020-11-02 2020-11-02 Low-cost power factor correction control circuit and driving power supply Active CN213754319U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202022490613.1U CN213754319U (en) 2020-11-02 2020-11-02 Low-cost power factor correction control circuit and driving power supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202022490613.1U CN213754319U (en) 2020-11-02 2020-11-02 Low-cost power factor correction control circuit and driving power supply

Publications (1)

Publication Number Publication Date
CN213754319U true CN213754319U (en) 2021-07-20

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Address after: 237300 Standardized Workshop B-8 of Jinwutong Pioneer Park, Jinzhai Modern Industrial Park, Luan City, Anhui Province

Patentee after: Anhui Letu Electronic Technology Co.,Ltd.

Address before: 237300 Standardized Workshop B-8 of Jinwutong Pioneer Park, Jinzhai Modern Industrial Park, Luan City, Anhui Province

Patentee before: Anhui Letu Electronic Technology Co.,Ltd.