Double-rectifier bridge optimization device and air conditioner

Abstract

The double-rectifier bridge optimization device comprises a protection unit, an anti-interference unit, a double-rectifier bridge and a filtering unit which are connected in sequence, the side, away from the anti-interference unit, of the protection unit is connected with a live wire L and a null line N of an alternating current power supply, and the side, away from the double-rectifier bridge, of the filtering unit is connected with the positive electrode and the negative electrode of a load. The double rectifier bridges comprise resistors and diodes, and the resistors and the diodes in the double rectifier bridges are arranged in a matched manner, so that the current balance between different diodes in the double rectifier bridges can be improved; according to the double-rectifier bridge optimization device and the air conditioner, the problem of unbalanced current in the diodes in the double rectifier bridges can be solved, the safety and the stability of the operation of the double rectifier bridges are improved, the service life of the double rectifier bridges is prolonged, and the operation reliability of a controller is further improved.

Description

Technical Field

[0001] The utility model relates to the field of air conditioning, and in particular to a dual-rectifier bridge optimization device and an air conditioner. Background Art

[0002] With the accelerated development of science and technology, the use of electricity has penetrated into all aspects of life. Whether it is the use of new energy vehicles, magnetic levitation high-speed railways, or smart home appliances, they all require the support of power electronics. Among electronic devices, the application of rectifier bridges that can convert alternating current into direct current is extremely important.

[0003] The existing integrated rectifier bridge generally consists of 4 identical diodes, and the performance of the rectifier bridge is limited by the quality of any diode. If any diode is damaged, the output characteristics of the rectifier bridge will be affected, and even the entire controller function will be out of control. Currently, due to factors such as production technology, dual rectifier bridges are commonly connected in parallel in the circuit to enhance the output power of the module, such as Figure 1 The circuit principle is shown as follows: L / N neutral wire is connected, FU is a fuse, which is used to protect the subsequent circuits and components and to cut off the power supply in time when a short circuit occurs; ZR is a varistor, which is used to absorb surge voltage and prevent damage to subsequent components. X1 and X2 are safety capacitors to suppress differential mode interference, L1 is a common mode inductor to suppress common mode interference, C1 is a filter electrolytic capacitor, R1 is the equivalent resistance of the subsequent load, and BG1 and BG2 are rectifier bridges to realize the conversion of AC-DC to DC.

[0004] In addition, if Figure 2 As shown in the figure: according to the temperature characteristics of the diode itself, the temperature increase will reduce the forward conduction voltage drop of the diode; at the same time, in the parallel circuit of the diodes, in order to ensure the consistency and stability of the voltage drop of the parallel diodes, the current flowing through the diode with a high temperature and a small conduction voltage drop will increase; the two parallel diodes in the figure are respectively located in different rectifier bridges (such as d1 and d11). After being connected in parallel, it is easy to produce temperature differences due to different rectifier bridges, resulting in unbalanced current inside the parallel diodes. In the long run, the diodes with large currents are prone to overheating and damage, and their lifespan is affected, thereby affecting the functional characteristics of the controller and even affecting the comfort of the entire machine and causing user complaints. Therefore, it is of great significance to study how to improve the operating stability and safety of the integrated rectifier bridge.

[0005] In patent CN108711931B, a three-phase AC electric switch machine phase failure protector with controllable composite power supply is proposed, including a power supply unit, a control unit, a drive unit and a current sampling unit. The power supply unit includes a power supply module I, a power supply module II and a power supply control module. The input ends of the power supply module I and the power supply module II are respectively connected to the three-phase AC circuit through a current transformer and a power transformer, and the output ends of the power supply module I and the power supply module II are connected to the drive unit, the control unit and the power supply control module; the current sampling unit is connected to the three-phase AC circuit, the control unit is respectively connected to the current sampling unit, the drive unit and the power supply control module, and the output end of the drive unit is connected to the protection relay of the electric switch machine action circuit. The circuit just involves the use of a rectifier bridge for current conversion, but the setting of the rectifier bridge in the circuit still faces the problem of easy overheating and damage of the rectifier bridge. Utility Model Content

[0006] In view of this, the utility model aims to propose a dual rectifier bridge optimization device and an air conditioner to solve the problem of current imbalance in the diodes in the dual rectifier bridge in the prior art. In the long run, the diodes with large current flowing through them are prone to overheating and damage, which affects the service life of the diodes and thus affects the functional characteristics of the controller; thereby optimizing the problem of current imbalance in the diodes in the dual rectifier bridge, improving the safety and stability of the operation of the dual rectifier bridge, increasing the service life of the dual rectifier bridge, and thereby improving the operating reliability of the device.

[0007] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0008] The utility model relates to a dual rectifier bridge optimization device and an air conditioner. The dual rectifier bridge optimization device comprises a protection unit, an anti-interference unit, a dual rectifier bridge and a filtering unit which are connected in sequence. The side of the protection unit away from the anti-interference unit is respectively connected to the live wire L and the neutral wire N of the AC power supply, and the side of the filtering unit away from the dual rectifier bridge is connected to the positive and negative poles of the load. The dual rectifier bridge comprises resistors and diodes. The resistors and diodes in the dual rectifier bridge are arranged in coordination to improve the current balance between different diodes in the dual rectifier bridge, and to optimize the problem of current imbalance in the diodes in the dual rectifier bridge, thereby improving the safety and stability of the operation of the dual rectifier bridge, and improving the service life of the dual rectifier bridge, thereby improving the operational reliability of the controller.

[0009] Furthermore, the dual rectifier bridge includes a rectifier bridge BG1 and a rectifier bridge BG2, and the rectifier bridge BG1 and the rectifier bridge BG2 are connected in parallel; the resistors and diodes in the dual rectifier bridge are both set to 8n, where n is a positive integer; the protection unit includes a fuse FU and a varistor ZR, the anti-interference unit includes a safety capacitor X1, a safety capacitor X2 and a common-mode inductor L1, the filter unit is a filter electrolytic capacitor C1, the load is a rear-stage load equivalent resistor R1, the current input end of the fuse FU is connected to the AC live wire L, the current output end of the fuse FU is respectively connected to the varistor ZR, the current input end of the safety capacitor X1, and the input side circuit input end of the common-mode inductor L1, and the varistor ZR, the current output end of the safety capacitor X1, and the input side circuit output end of the common-mode inductor L1 are connected in parallel to the AC The electric neutral line N is connected, the current output end of the output side of the common-mode inductor L1 is connected to pin 1 of the rectifier bridge BG1 and the rectifier bridge BG2, the current input end of the output side of the common-mode inductor L1 is connected to pin 3 of the rectifier bridge BG1 and the rectifier bridge BG2, the pins 2 of the rectifier bridge BG1 and the rectifier bridge BG2 are respectively connected to the current input end of the filter electrolytic capacitor C1 and the subsequent load equivalent resistor R1, and the pins 4 of the rectifier bridge BG1 and the rectifier bridge BG2 are respectively connected to the current output end of the filter electrolytic capacitor C1 and the subsequent load equivalent resistor R1. Through the coordinated setting of the internal resistors and diodes of the dual rectifier bridges, the adaptive adjustment of the internal resistance of the rectifier bridge can be effectively improved, the current balance consistency of the parallel branches of the dual rectifier bridges can be ensured, and the burning of the rectifier bridge caused by the temperature rise difference of different rectifier bridges can be avoided.

[0010] Further, the first rectifier bridge BG1 includes a first resistor r1, a second resistor r2, a third resistor r3, a fourth resistor r4, a first diode d1, a second diode d2, a third diode d3 and a fourth diode d4, and the fourth resistor r4, the fourth diode d4, the first resistor r1, the first diode d1, the second diode d2, the second resistor r2, the third diode d3 and the third resistor r3 are connected in sequence to form a loop; the cathode of the first diode d1 is connected to the cathode of the second diode d2, the cathode of the fourth diode d4 is connected to an end of the first resistor r1 away from the first diode d1, and the cathode of the third diode d3 is connected to an end of the second resistor r2 away from the second diode d2; a pin 1 is set between the fourth diode d4 and the first resistor r1, a pin 2 is set between the first diode d1 and the second diode d2, a pin 3 is set between the second resistor r2 and the third diode d3, and a pin 4 is set between the fourth resistor r4 and the third resistor r3; the second rectifier bridge BG2 includes a first resistor r11, a first second resistor r12, and a first third resistor r13 , the first four resistors R14, the first one diode D11, the first two diodes D12, the first three diodes D13 and the first four diodes D14, the first four resistors R14, the first four diodes D14, the first one resistor R11, the first one diode D11, the first two diodes D12, the first two resistors R12, the first three diodes D13, the first three resistors R13 are connected in sequence to form a loop; the cathode of the first one diode D11 is connected to the cathode of the first two diodes D12, the cathode of the first four diodes D14 is connected to an end of the first one resistor R11 away from the first one diode D11, and the cathode of the first three diodes D13 is connected to an end of the first two resistors R12 away from the first two diodes D12. By adjusting the positive and negative connection relationship between the diodes or between the diodes and the resistors, the influence of the temperature rise difference inside the rectifier bridge on the control circuit can be effectively solved, and it is also beneficial to stabilize the output characteristics of the diodes in the rectifier bridge, improve the safety and reliability of the rectifier bridge circuit, thereby improving the comfort of users and reducing the occurrence of circuit failure rate.

[0011] An air conditioner comprises the dual-bridge rectifier optimization device, wherein the dual-bridge rectifier optimization device is arranged inside the air conditioner.

[0012] Compared with the prior art, the dual rectifier bridge optimization device and air conditioner described in the utility model have the following beneficial effects:

[0013] Through the setting of the rectifier bridge optimization device, the problem of current imbalance in the diodes in the dual rectifier bridge can be optimized, the safety and stability of the dual rectifier bridge operation can be improved, the service life of the dual rectifier bridge can be improved, and the operating reliability of the controller can be improved. It can also improve the stability and flexibility of the whole machine operation, enhance the user's comfort, and improve user satisfaction. In addition, it can also ensure the current balance adjustment of the dual rectifier bridge, improve device reliability, and reduce the occurrence rate of failures; the use of adaptive adjustment of the internal resistance of the rectifier bridge can ensure the current balance consistency of the parallel branches of the dual rectifier bridge, avoid the burning of the rectifier bridge caused by the difference in temperature rise of different rectifier bridges, affect the output characteristics, and cause user complaints. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0015] Figure 1 It is a schematic diagram of the circuit structure principle in the prior art;

[0016] Figure 2 It is a schematic diagram of the volt-ampere characteristic curve of a diode in the prior art;

[0017] Figure 3 This is the overall schematic diagram of the dual rectifier bridge structure of this application;

[0018] Figure 4 This is a schematic diagram of the structure principle of the dual rectifier bridge circuit of this application;

[0019] Figure 5 Schematic diagram of the dual bridge rectifier optimization method flow chart.

[0020] Explanation of the accompanying drawings: 7, protection unit; 8, anti-interference unit; 9, dual rectifier bridge; 10, filtering unit. DETAILED DESCRIPTION

[0021] The following will use the terms commonly used by those skilled in the art to convey the essence of their work to other technical personnel in the art to describe the utility model concepts of the present disclosure. However, these utility model concepts can be embodied in many different forms and should not be considered as limited to the embodiments described herein.

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0023] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0024] This embodiment is directed to an air conditioner, and similar to a conventional rectifier bridge, the overall structure is composed of a diode, a compressor, and a motor.

[0025] In the prior art, an integrated rectifier bridge generally consists of four identical diodes. Currently, due to factors such as production process, dual rectifier bridges are commonly connected in parallel in the circuit to enhance the module output power. However, the two parallel diodes are located in different rectifier bridges. After being connected in parallel, temperature differences are easily generated due to different rectifier bridges, resulting in unbalanced current inside the parallel diodes. Over time, diodes with large currents are prone to overheating and damage, and their lifespan is affected, thereby affecting the functional characteristics of the controller and even affecting the comfort of the entire machine, causing user complaints.

[0026] In order to solve the problem of current imbalance in diodes in the dual rectifier bridge in the prior art, if the diodes with large current flow through them for a long time, they are prone to overheating and damage, which affects the service life of the diodes and thus affects the functional characteristics of the controller; this embodiment proposes a dual rectifier bridge optimization device and an air conditioner, the dual rectifier bridge optimization device includes a protection unit 7, an anti-interference unit 8, a dual rectifier bridge 9 and a filter unit 10 connected in sequence, the side of the protection unit 7 away from the anti-interference unit 8 is respectively connected to the live wire L and the neutral wire N of the AC power supply, the side of the filter unit 10 away from the dual rectifier bridge 9 is connected to the positive and negative poles of the load, the dual rectifier bridge 9 includes a rectifier bridge BG1 and a rectifier bridge BG2, the rectifier bridge BG1 and the rectifier bridge BG2 are connected in parallel, the dual rectifier bridge 9 includes resistors and diodes, the resistors and diodes in the dual rectifier bridge 9 are both set to 8n, n is a positive integer, and the resistors and diodes in the dual rectifier bridge 9 are arranged in coordination, so that the current balance between different diodes in the dual rectifier bridge 9 can be improved on the basis of converting the AC power supply into a stable DC power supply and outputting it to the subsequent load.

[0027] Through the optimized setting of the dual rectifier bridge 9, the problem of current imbalance in the diodes in the dual rectifier bridge 9 can be optimized, the safety and stability of the operation of the dual rectifier bridge 9 can be improved, the service life of the dual rectifier bridge 9 can be improved, and the operating reliability of the controller can be improved. It can also improve the stability and flexibility of the operation of the whole machine, enhance the user's comfort, improve user satisfaction, and ensure the current balance adjustment of the dual rectifier bridge 9, improve device reliability, and reduce the occurrence rate of failures.

[0028] The protection unit 7 includes a fuse FU and a varistor ZR. The anti-interference unit 8 includes a safety capacitor X1, a safety capacitor X2 and a common-mode inductor L1. The filter unit 10 is a filter electrolytic capacitor C1. The subsequent load is a subsequent load equivalent resistor R1. The current input end of the fuse FU is connected to the AC live wire L. The current output end of the fuse FU is respectively connected to the varistor ZR, the current input end of the safety capacitor X1 and the input end of the common-mode inductor L1. The varistor ZR, the current output end of the safety capacitor X1 and the common-mode inductor L1 are connected to the input side circuit input end. After the output end of the circuit on the input side of the inductor L1 is connected in parallel, it is connected to the AC neutral line N. The current output end of the output side of the common-mode inductor L1 is connected to pin 1 of the rectifier bridge BG1 and the rectifier bridge BG2. The current input end of the output side of the common-mode inductor L1 is connected to pin 3 of the rectifier bridge BG1 and the rectifier bridge BG2. Pin 2 of the rectifier bridge BG1 and the rectifier bridge BG2 is respectively connected to the current input end of the filter electrolytic capacitor C1 and the equivalent resistor R1 of the subsequent load, and outputs positive DC. Pins of the rectifier bridge BG1 and the rectifier bridge BG2 4 are respectively connected to the current output end of the filter electrolytic capacitor C1 and the current output end of the back-stage load equivalent resistor R1, and output negative direct current, wherein the rectifier bridge BG1 includes a first resistor r1, a second resistor r2, a third resistor r3, a fourth resistor r4, a first diode d1, a second diode d2, a third diode d3 and a fourth diode d4, the fourth resistor r4, the fourth diode d4, the first resistor r1, the first diode d1, the second diode d2, the second resistor r2, the third diode d3, and the third resistor r3 are sequentially connected to form a loop, the cathode of the first diode d1 is connected to the cathode of the second diode d2, the cathode of the fourth diode d4 is connected to an end of the first resistor r1 away from the first diode d1, the cathode of the third diode d3 is connected to an end of the second resistor r2 away from the second diode d2, a pin 1 is set between the fourth diode d4 and the first resistor r1, a pin 2 is set between the first diode d1 and the second diode d2, a pin 3 is set between the second resistor r2 and the third diode d3, and a pin 4 is set between the fourth resistor r4 and the third resistor r3;The second rectifier bridge BG2 includes a first resistor r11, a first second resistor r12, a first third resistor r13, a first fourth resistor r14, a first diode d11, a first second diode d12, a first third diode d13 and a first fourth diode d14. The first fourth resistor r14, the first fourth diode d14, the first first resistor r11, the first first diode d11, the first second diode d12, the first second resistor r12, the first third diode d13 and the first third resistor r13 are connected in sequence to form a loop. The cathode of the first first diode d11 is connected to the cathode of the first second diode The cathode of the first diode d12 is connected, the cathode of the first four diodes d14 is connected to one end of the first resistor r11 away from the first diode d11, the cathode of the first three diodes d13 is connected to one end of the first two resistors r12 away from the first two diodes d12, a pin 1 is set between the first four diodes d14 and the first resistor r11, a pin 2 is set between the first one diode d11 and the first two diodes d12, a pin 3 is set between the first two resistors r12 and the first three diodes d13, and a pin 4 is set between the first four resistors r14 and the first three resistors r13. ;

[0029] By adopting the adaptive adjustment of the internal resistance of the rectifier bridge, the current balance consistency of the parallel branches of the dual rectifier bridge 9 can be ensured, avoiding the burning of the rectifier bridge caused by the difference in temperature rise of different rectifier bridges, affecting the output characteristics and causing user complaints.

[0030] An air conditioner comprises the dual-bridge rectifier optimization device, wherein the dual-bridge rectifier optimization device is arranged inside the air conditioner.

[0031] Among them, an optimization method for a dual rectifier bridge optimization device is applied to the dual rectifier bridge optimization device, and the method comprises the following steps:

[0032] Step 1: The air-conditioning unit is operated as a whole, and the corresponding parallel branches in the dual rectifier bridge 9, i.e., the first rectifier bridge BG1 and the second rectifier bridge BG2 are numbered as j, and the initial value j=0 is preset, wherein j is the branch number and j is an integer. In the present embodiment, when j=1, the first branch in the first rectifier bridge BG1 refers to the circuit between pin 1 and pin 2 of the first rectifier bridge BG1, and specifically the first branch includes the first diode d1 and the first resistor r1, and the first branch in the second rectifier bridge BG2 refers to the branch between pin 1 and pin 2 of the second rectifier bridge BG2, and specifically the first branch includes the first resistor r11 and the first diode d11; when j=2, the second branch in the first rectifier bridge BG1 refers to the circuit between pin 2 and pin 3 of the first rectifier bridge BG1, and specifically the second branch includes the second diode d2 and the second resistor r2, and the second branch in the second rectifier bridge BG2 refers to the circuit between pin 2 and pin 3 of the first rectifier bridge BG1 The branch between pin 2 and pin 3 of the bridge BG2, specifically the second branch includes the first second resistor r12 and the first second diode d12; when j=3, the third branch in the rectifier bridge BG1 refers to the circuit between pin 3 and pin 4 of the rectifier bridge BG1, specifically the third branch includes the third diode d3 and the third resistor r3, the first branch in the rectifier bridge BG2 refers to the branch between pin 3 and pin 4 of the rectifier bridge BG2, specifically the third branch includes the first third resistor r13 and the first third diode d13; when j=4, the fourth branch in the rectifier bridge BG1 refers to the circuit between pin 4 and pin 1 of the rectifier bridge BG1, specifically the fourth branch includes the fourth diode d4 and the fourth resistor r4, the fourth branch in the rectifier bridge BG2 refers to the branch between pin 4 and pin 1 of the rectifier bridge BG2, specifically the fourth branch includes the first fourth resistor r14 and the first fourth diode d14;

[0033] Step 2: Let j=j+1;

[0034] Step 3: Real-time monitoring of the resistance corresponding to the j-th branch in the dual rectifier bridge 9, i.e., the first rectifier bridge BG1 and the second rectifier bridge BG2, the temperature value of the diode, and the current ij flowing through the branch, and calculating the diode temperature rise difference △Tdj and the resistance temperature difference △Trj of the corresponding branches in the first rectifier bridge BG1 and the second rectifier bridge BG2, wherein the corresponding branch refers to the branch corresponding to the j-th branch in the first rectifier bridge BG1 and the j-th branch in the second rectifier bridge BG2, and the j-th branch in the first rectifier bridge BG1 and the j-th branch in the second rectifier bridge BG2 are connected in parallel;

[0035] Step 4, calculating the diode conduction voltage drop △Udj and the resistance voltage rise △Urj of the corresponding branches in the double rectifier bridge 9, i.e., the rectifier bridge 1 BG1 and the rectifier bridge 2 BG2;

[0036] Step 5: Determine whether the characteristics of the integrated resistor of the current branch, i.e., the jth branch, of the dual rectifier bridge 9, i.e., the first rectifier bridge BG1 and the second rectifier bridge BG2 satisfy △Udj=△Urj. If yes, proceed to step 6. If no, the current branch in the dual rectifier bridge 9, i.e., the first rectifier bridge BG1 and the second rectifier bridge BG2 fails to achieve self-balancing, and the branch needs to be repaired and adjusted, and return to step 1.

[0037] Step 6: Determine whether j>4. If yes, the corresponding branch current of the dual rectifier bridge 9 circuit can be dynamically adjusted to achieve self-balancing. If no, return to step 2.

[0038] Through the optimization method, the current imbalance problem of the dual rectifier bridge 9 circuit can be solved, and through the optimization method and the setting of the dual rectifier bridge 9 structure, the adaptive adjustment inside the dual rectifier bridge 9 under different temperature differences can be achieved, thereby ensuring the current consistency of each diode, such as Figure 4 As shown, the first rectifier bridge BG1 has internal integrated resistors r1, r2, r3, and r4, and the second rectifier bridge BG2 has internal integrated resistors r11, r12, r13, and r14, wherein r1, r2, r3, r4, r11, r12, r13, and r14 are positive temperature coefficient PTC resistors with consistent characteristics, i.e., the resistance value increases with the temperature increase and the corresponding voltage division increases. In addition, the branch resistors and diodes are connected in series, and the diode voltage drop and resistor voltage increase caused by the temperature rise offset each other, thereby ensuring the current consistency of the parallel rectifier bridge branches in the entire circuit and realizing dynamic current regulation.

[0039] Step three includes:

[0040] Step S31: respectively monitor in real time the temperature value Tdj of the diode corresponding to the j-th branch of the first rectifier bridge BG1, the temperature value Td1j of the diode corresponding to the j-th branch of the second rectifier bridge BG2, the temperature value Tr1j of the resistor, and the current ij flowing through the branch. In this embodiment, since the resistors and diodes between different branches in the first rectifier bridge BG1 and the second rectifier bridge BG2 are connected in series, in the same rectifier bridge, the current flowing through the resistors and diodes between different branches is ij;

[0041] Step S32: △Tdj is calculated by the first formula F1, and the first formula F1 is △Tdj=Tdj-Td1j;

[0042] Step S33: determine whether △Tdj>0, if yes, execute step S34; if no, execute the rectifier bridge BG2 abnormality, repair the dual rectifier bridge 9, and return to step S31;

[0043] Step S34: ΔTrj is calculated by the second formula F2, and the second formula F2 is ΔTrj=Trj-Tr1j;

[0044] Step S35: Determine whether △Trj>0, if yes, execute step 4; if not, execute the rectifier bridge BG2 abnormality, after repairing the dual rectifier bridge 9, return to step S31; in this embodiment, △Tdj and △Trj are both greater than 0, but are actually set according to specific circumstances, △Tdj is the temperature rise difference between the diode of the j-th branch in the rectifier bridge BG1 and the diode of the j-th branch in the rectifier bridge BG2, △Trj is the temperature difference between the resistance of the j-th branch in the rectifier bridge BG1 and the resistance of the j-th branch in the rectifier bridge BG2.

[0045] Through the setting of step three, the state of the resistors and diodes in each branch can be monitored in real time, and the diode temperature rise difference △Tdj and the resistance temperature difference △Trj in different branches can be calculated, which is conducive to improving the accurate analysis of the real-time state of the dual rectifier bridge 9. When △Tdj≤0 and / or △Trj≤0, the circuit structure of the dual rectifier bridge 9 can be adjusted or repaired in time, thereby improving the operating stability and reliability of the dual rectifier bridge 9, realizing dynamic adjustment of the current inside the dual rectifier bridge 9, thereby reducing the failure rate of the device and increasing the operating safety of the device.

[0046] Step 4 includes:

[0047] Step S41: Calculate the relationship coefficient between the temperature rise and the voltage drop of the diode in the j-th branch according to the detected relevant parameters of the diode in the j-th branch, and record it as the proportionality coefficient kj;

[0048] Step S42: Substituting the proportionality coefficient kj into the third formula F3, △Udj is calculated. The third formula F3 is △Udj=kj*△Tdj;

[0049] Step S43: obtaining the PTC resistance temperature rise characteristic coefficient α of the resistance in the j-th branch according to the relevant parameters of the resistance in the j-th branch that have been detected, wherein α>1;

[0050] Step S44: The resistance increase caused by the temperature rise is calculated by α as △Rj=α*△Trj, and the resistance voltage increase is calculated again by the fourth formula F4 as △Urj=ij*△Rj. The fourth formula F4 is △Urj=ij*△Rj. In this embodiment, △Urj is the voltage increase caused by the temperature rise of the resistor in the j-th branch, △Rj is the resistance increase caused by the temperature rise of the resistor in the j-th branch, △Udj is the conduction voltage drop caused by the temperature rise of the diode in the j-th branch of the rectifier bridge BG1 and the rectifier bridge BG2, wherein kj satisfies Figure 2 The curve shown in the figure shows that the value of kj varies depending on the characteristics of different diodes.

[0051] By introducing α and kj in step 4, corresponding adjustments can be made in combination with the specific characteristics of different resistors or diodes, thereby improving the accuracy of the calculated diode conduction voltage drop △Udj and the resistance voltage increase △Urj, enhancing the reliability of the optimization of the dual rectifier bridge 9, and improving the stability of the dynamic adjustment of the branch current to achieve self-balancing.

[0052] Specifically, when j=1, the first rectifier bridge BG1 has internal integrated resistors r1, r2, r3, and r4, and the second rectifier bridge BG2 has internal integrated resistors r11, r12, r13, and r14. The specific electrical connection method is shown in the figure, wherein branches r1 and d1 and branches r11 and d11 are parallel structures. The following text will take these two branches as an example for introduction. The same is true for other branches and there is no need to elaborate.

[0053] As the whole machine is running, there must be a temperature difference between the first rectifier bridge BG1 and the second rectifier bridge BG2. △Td1=(Td1-Td11), △Td1 is the temperature rise difference between diodes d1 and d11, △Td1>0, Td1 is the temperature of diode d1, Td11 is the temperature of diode d11, assuming that the temperature of d1 is higher than d11, △Ud1=k1*△Td1, △Ud1 is the conduction voltage drop caused by the temperature rise of the diode, k1 is the proportionality coefficient, that is, the relationship coefficient between the temperature rise and the voltage drop of the diode, which satisfies Figure 2 The curves shown vary according to the characteristics of different diodes. Since the temperature rise of the series resistors and diodes in each branch of different rectifier bridges is similar, △Tr1=(Tr1–Tr11), △Tr1 is the temperature difference between resistors r1 and r11. Assuming that the temperature of r1 is higher than that of r11, △R1=α*△Tr1, △R1 is the increase in resistance caused by temperature rise, α is the temperature rise characteristic coefficient of the PTC resistor, and its value is greater than 1, △Ur1=i1*△R1 (△Ur1 is the voltage increase caused by the temperature rise of the resistor, and i1 is the current flowing through the first branch). The integrated resistance characteristic of the rectifier bridge BG1 satisfies △Ud1=△Ur1, that is, the current of the corresponding branches of BG1 and BG2 can be dynamically adjusted to achieve self-balancing, that is, on the premise of meeting the load demand, the current balance adjustment of the dual rectifier bridge 9 is ensured, the reliability of the device is improved, and the failure rate is reduced.

[0054] In the utility model, any air conditioner may include a dual rectifier bridge structure as described in the present embodiment, and based on the relevant structures and assembly relationships of the resistors and fuses provided in the present embodiment, the air conditioner may also include conventional components including diodes, compressors, motors and other structures. Since they are all prior art, they will not be elaborated here.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A dual rectifier bridge optimization device, characterized in that: The invention comprises a protection unit (7), an anti-interference unit (8), a dual rectifier bridge (9) and a filter unit (10) which are connected in sequence. The side of the protection unit (7) away from the anti-interference unit (8) is respectively connected to a live wire L and a neutral wire N of an AC power supply. The side of the filter unit (10) away from the dual rectifier bridge (9) is connected to the positive and negative electrodes of a load. The dual rectifier bridge (9) comprises a resistor and a diode. The resistor and the diode in the dual rectifier bridge (9) are arranged in coordination, so that the current balance between different diodes in the dual rectifier bridge (9) can be improved.

2. A dual rectifier bridge optimization device according to claim 1, characterized in that: The dual rectifier bridge (9) comprises a first rectifier bridge BG1 and a second rectifier bridge BG2, and the first rectifier bridge BG1 and the second rectifier bridge BG2 are connected in parallel.

3. A dual rectifier bridge optimization device according to claim 1, characterized in that: The number of resistors and diodes in the dual rectifier bridge (9) is 8n, where n is a positive integer.

4. A dual rectifier bridge optimization device according to claim 2, characterized in that: The protection unit (7) comprises a fuse tube FU and a varistor ZR; the anti-interference unit (8) comprises a safety capacitor X1, a safety capacitor X2 and a common mode inductor L1; the filter unit (10) is a filter electrolytic capacitor C1; the load is a subsequent load equivalent resistor R1; the current input end of the fuse tube FU is connected to the AC live wire L; the current output end of the fuse tube FU is respectively connected to the varistor ZR, the current input end of the safety capacitor X1 and the input end of the common mode inductor L1; the varistor ZR, the current output end of the safety capacitor X1 and the input end of the common mode inductor L1 are connected to the AC live wire L; the current output end of the fuse tube FU is respectively connected to the varistor ZR, the current input end of the safety capacitor X1 and the input end of the common mode inductor L1. After the output ends of the common-mode inductor L1 are connected in parallel, they are connected to the AC neutral line N, the current output end of the output side of the common-mode inductor L1 is connected to pin 1 of the rectifier bridge BG1 and the rectifier bridge BG2, the current input end of the output side of the common-mode inductor L1 is connected to pin 3 of the rectifier bridge BG1 and the rectifier bridge BG2, the pins 2 of the rectifier bridge BG1 and the rectifier bridge BG2 are respectively connected to the current input end of the filter electrolytic capacitor C1 and the subsequent load equivalent resistor R1, and the pins 4 of the rectifier bridge BG1 and the rectifier bridge BG2 are respectively connected to the current output end of the filter electrolytic capacitor C1 and the subsequent load equivalent resistor R1.

5. A dual rectifier bridge optimization device according to claim 4, characterized in that: The rectifier bridge BG1 includes a first resistor r1, a second resistor r2, a third resistor r3, a fourth resistor r4, a first diode d1, a second diode d2, a third diode d3 and a fourth diode d4. The fourth resistor r4, the fourth diode d4, the first resistor r1, the first diode d1, the second diode d2, the second resistor r2, the third diode d3 and the third resistor r3 are connected in sequence to form a loop.

6. A dual rectifier bridge optimization device according to claim 5, characterized in that: The cathode of the first diode d1 is connected to the cathode of the second diode d2, the cathode of the fourth diode d4 is connected to an end of the first resistor r1 away from the first diode d1, and the cathode of the third diode d3 is connected to an end of the second resistor r2 away from the second diode d2.

7. A dual rectifier bridge optimization device according to claim 6, characterized in that: A pin 1 is arranged between the fourth diode d4 and the first resistor r1 , a pin 2 is arranged between the first diode d1 and the second diode d2 , a pin 3 is arranged between the second resistor r2 and the third diode d3 , and a pin 4 is arranged between the fourth resistor r4 and the third resistor r3 .

8. A dual rectifier bridge optimization device according to claim 4, characterized in that: The second rectifier bridge BG2 includes a first-first resistor r11, a first-second resistor r12, a first-third resistor r13, a first-fourth resistor r14, a first-first diode d11, a first-second diode d12, a first-third diode d13 and a first-fourth diode d14. The first-fourth resistor r14, the first-fourth diode d14, the first-first resistor r11, the first-first diode d11, the first-second diode d12, the first-second resistor r12, the first-third diode d13 and the first-third resistor r13 are connected in sequence to form a loop.

9. A dual rectifier bridge optimization device according to claim 8, characterized in that: The cathode of the first-first diode d11 is connected to the cathode of the first-second diode d12, the cathode of the first-fourth diode d14 is connected to an end of the first-first resistor r11 away from the first-first diode d11, and the cathode of the first-third diode d13 is connected to an end of the first-second resistor r12 away from the first-second diode d12.

10. An air conditioner, characterized in that: It comprises a dual rectifier bridge optimization device as described in any one of claims 1 to 9, wherein the dual rectifier bridge optimization device is arranged inside the air conditioner.

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