JP3120478U - Current suppression balanced circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a current suppression balance circuit that achieves stability control of load operation and a current balance effect.
The present invention is applied to a control circuit including at least one load (lamp tube, light-emitting component, single-phase or multi-phase shunt high-efficiency module, etc.), and includes an inverter circuit, a detection circuit, and a balanced transformer. The inverter circuit provides current to the load, and the detection circuit receives and detects the current amount of the total load or the reference load in the control circuit, stabilizes the current amount, and returns it to the input terminal of the inverter circuit. The circuit outputs a stable (modified) current. At least one balanced transformer receives a modified stable current in its primary coil, and its secondary coil is individually in series with the load. Thus, applying Lenz's theorem, when the current on the secondary side of the balanced transformer is mutated (the load current is mutated), it is individually compared with the corrected current on the primary side.
[Selection] Figure 1

Description

  The present invention relates to a kind of current suppression balanced circuit. In particular, the present invention relates to a current-suppressing balanced circuit that uses a kind of balanced transformer, compares the current at each load end with a stable (corrected) current, and achieves the effect of controlling the stability of the operation of the load and current balancing.

In general liquid crystal monitor panels, it is often necessary to use many lamp tubes in order to obtain sufficient luminance. Therefore, a single transformer or other power conversion system is used to provide power to the lamp tube, and two or more lamp tubes connected in parallel are driven.
However, since there is a difference in the resistance value between each lamp tube, it has a significant effect on the uniform distribution of the tube current (divided flow) flowing through each parallel-connected lamp tube. If the current is too small (or too large), the luminance is insufficient (or excessive), and the uniformity of the light source of the liquid crystal monitor panel is adversely affected. In addition, if the current is excessive, the service life of the lamp tube itself and the entire system will be shortened, and moreover, it will be possible to accurately control the situation, such as changes in the inverter part error and lamp tube characteristics over time. Can not. In addition, due to the negative electrical resistance characteristics of the lamp tube, when the tube current increases after any one of the lamp tubes starts up first, the tube voltage decreases relatively, and the other lamp tubes that are connected in parallel output the input voltage. Has already been clamped to a lower potential, it will not be able to start up smoothly, and even a panel flashing phenomenon will occur.
Taiwan Patent Gazette Publication No. 478292 “Multi-lamp tube drive system” achieves the objective of lamp tube current balance by utilizing the principle of resistance value mainly by the output load end of a single inverter. In the course of operation, the system must be installed with reference to the main lamp tube, and the other sub lamp tubes must in turn correspondingly balance the resistance values of the main lamp tube and the current. Moreover, the normal internal resistance characteristic curve of the tube voltage of the tube voltage due to minute errors such as length and diameter of the tube, mercury density, pressure, electrode coating layer, etc. that cannot be calculated in the manufacturing process existing between each tube. The lamp tube cannot be brought into the best operating state and its current balancing effect cannot be achieved.
Taiwan Patent Gazette Publication No. 478292 JP 2004-265868 A

As described above, the known structure has the following drawbacks.
In other words, the main lamp tube must be installed as a reference, and in addition, the sub lamp tube must be sequentially balanced with the resistance value of the current corresponding to the main lamp tube. Susceptible to. This causes a shift of the tube voltage with respect to the internal resistance characteristic curve of the tube current, so that each lamp tube cannot be brought into the best operating state, and the current balance effect cannot be achieved. In addition, when applied to multi-tube parallel connection output, there is a problem of suppressing the start of other lamp tubes due to the tube voltage clamper caused by the previously started lamp tube, which is not suitable for use in the direct drive design method. .
The present invention has been made in view of the above problems of the structure, and provides a current suppression balanced circuit that controls the stability of the operation of the load and the current balance.

In order to solve the above problems, the present invention provides the following current suppression balanced circuit.
It mainly provides a kind of current suppression balanced circuit, at least one load (such as lamp tube such as CCFT cold cathode tube), light emitting component (such as LED or OLED diode), single phase or multiphase shunt high efficiency module ( Application in a control circuit comprising a multi-phase DC-DC converter, etc., comprising an inverter circuit, a detection circuit, at least one balancing transformer, the inverter circuit providing current to the load, the detection circuit Receives and detects the current amount of the total load (or designated reference load) in the control circuit, stabilizes the current amount (rectification filtration), returns it to the input terminal of the inverter circuit, and the inverter circuit is stable (corrected). ) Output current, the at least one balanced transformer has its primary side coil receiving the stable (modified) current output by the inverter circuit, and its secondary side coil individually The low Thus, under the application of Lenz's Law, the direction of the induced potential is the direction of increase or decrease of the anti-antigen magnetic field lines, and the current on the secondary side of the balanced transformer is mutated (i.e., at the load end). When the current causes a variation), it individually compares (corresponds) with the primary stable (corrected) current to achieve the effect of controlling the stability and current balance of the load. This is a current suppression balanced circuit.

That is, the device of claim 1 is mainly applied to a control circuit having at least one load, and includes an inverter circuit, a detection circuit, and at least one balanced transformer.
The inverter circuit is a combination of a drive unit and one or more output transformers, and provides current to the load end, and the detection circuit is connected between the input end of the inverter circuit and a current transfer detection point in the control circuit. Connected to the control circuit, receiving and detecting the amount of current of the total load in the control circuit, stabilizing the amount of current, and returning it to the input terminal of the inverter circuit, the inverter circuit outputting a stable correction current, the at least one And the secondary coil individually connects the loads in series and utilizes the balanced transformer, and each of the load ends of the load transformers receives the corrected current output from the inverter circuit. A current characterized in that each current is compared with a modified current output by the inverter circuit, thereby achieving stability control of the operation of the load and current balancing. A control circuit equilibrium.

The invention of claim 2 is the current suppression balanced circuit according to claim 1, wherein the balanced transformer can be installed in the inverter circuit between the beginner side of the output transformer and the drive unit.
The invention of claim 3 is characterized in that the balanced transformer corresponds to a group of load or output transformers, and a primary coil in the same group grouped correspondingly is merged to form a single twin or multiple structure. A current suppression balanced circuit according to claim 1 or 2.
The invention of claim 4 is the current suppression balanced circuit according to claim 1, wherein the load is one or more lamp tubes or other light emitting components.
The invention according to claim 5 is the current suppression balanced circuit according to claim 1, wherein the load is a single-phase or multiphase shunt efficiency module.

  As described above, according to the present invention, the current at each load end can be compared with the corrected stable current using a balanced transformer, and the influence of minute errors caused by differences in each lamp tube situation. Can be eliminated. In this way, it is possible to effectively control the stability of the operation of the load, realize the effect of current balancing, and effectively control the driving (lighting) state of each load. Furthermore, the counter-electromotive force effect can completely overcome the lamp tube clamper problem that has been activated earlier, and can be applied to each direct drive design method to improve the overall module efficiency.

A preferred embodiment of the current suppression balanced circuit of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the embodiment of the present invention provides a kind of current suppression balanced circuit, at least one load 4 (light tube such as CCFT cold cathode tube, light emitting component such as LED or OLED diode), single phase, etc. Alternatively, the present invention is applied to a control circuit including a multi-phase shunt high efficiency module (such as a multi-phase DC-DC converter), and includes an inverter circuit 1, a detection circuit 2, and at least one balanced transformer 3.
The inverter circuit 1 is composed by combining the drive unit 11 and one or more output transformers T, and provides current to the load 4 end.
The detection circuit 2 is connected between the input terminal of the inverter circuit 1 and a current transfer detection point in the control circuit (low voltage side of the load 4 terminal), and the total load (or designated reference load in the control circuit) is connected. 4) The current amount of 4 is received and detected, and after correcting the current amount, it is returned to the input terminal of the inverter circuit 1, and the inverter circuit 1 outputs a stable (corrected) current.
The primary side coil of the at least one balanced transformer 3 receives a stable (corrected) current output from the inverter circuit 1, and its secondary side coil is individually connected to the load end 4 Are connected in series.

静態向量空間回路c内において、 （数式２）

であるため、
向量積分により、ストークス定理(Stokes’Theorem)を引用し、面積分転は線積分で、すなわち、（数式３）

本考案は、以下の関係式を得ることができる（数式４）。

この他、本考案は平衡変圧器設計中において、等方性の軟磁作為鉄心を使用し、これにより、さらに得られるコイル上の起電力(electro-motive force,emf)と鉄心内の磁動勢(magneto-motive force.mmf)はそれぞれ以下の通りである（数式５）。

このため、（数式６）

で、上式を簡化後、二次側コイル両端に現れる誘導電圧は反起電力を呈し、その大きさは以下のようであることが分かる（数式７）。

同時に本考案の実施例中の一次側電流(ｉp)は既に修正され安定電流になっているため、すなわち、(数式８)

で、さらに以下の式が得られる（数式９）。

Furthermore, the Lenz's Law is applied to the above structure, and the present invention proposes a counter electromotive force (Back emf) between the primary side coil and the secondary side coil of the balanced transformer 3. The operation principle relational expression is as follows.
E: Electric field strength D: Electric conduction strength J: Current strength
H: is the magnetic field strength B: is the magnetic field strength φ: is the magnetic flux in the iron core μ: is the magnetic conductivity coefficient L: is the amount of the inductor Maxwell-Faraday's Law and Maxwell-Ampere's Law ) (Formula 1)

In the static quantity circuit c, (Equation 2)

Because
Stokes' theorem is quoted by the direction integral, and the area rotation is a line integral, that is, (Equation 3)

The present invention can obtain the following relational expression (Formula 4).

In addition, the present invention uses an isotropic soft-magnetic iron core in the design of the balanced transformer, which further increases the electro-motive force (emf) on the coil and the magnetic force in the iron core. (magneto-motive force.mmf) is as follows (Formula 5).

For this reason, (Formula 6)

Thus, after simplifying the above equation, it can be seen that the induced voltage appearing at both ends of the secondary coil exhibits a counter electromotive force, and its magnitude is as follows (Equation 7).

At the same time, the primary current (ip) in the embodiment of the present invention has already been corrected and becomes a stable current, that is, (Equation 8)

Thus, the following formula is obtained (Formula 9).

Thus, as is clear from the above relational expression, when an unbalanced current is generated between the primary side and the secondary side of the balanced transformer 3, the counter electromotive force (i.e., vs. ) Is directly proportional to the secondary side current variation (ie dis / dt). At the same time, it increases as the secondary side inductor (i.e., Ls) increases, and the counter electromotive force (i.e., vs) increases and expands as the secondary side inductor (i.e., Ls) increases. Show.
This effectively applies (suppresses) the current at the load 4 end to which the secondary side coil of the balanced transformer 3 is connected in series, and the secondary side coil of the balanced transformer 3 The current can undergo a modification of the counter-electromotive force and the primary side current can achieve a perfectly balanced (corresponding) mechanism (i.e. Magnetism that generates currents cancel each other, the balanced transformer core maintains its operation and increases the amount of inductor in the non-saturated region, and at the same time, the counter electromotive force generated when the secondary current changes is reversed and loaded. Effectively stabilize operation).

Next, as shown in FIG. 1, when the control circuit of the present invention (the embodiment) is activated, the current amount (io) of the total load 4 in the control circuit is received and detected through the detection circuit 2, and the current is detected. After the amount is corrected, it is returned to the input end of the inverter circuit 1, and the inverter circuit 1 outputs a stable (corrected) current to the end of the load 4 via the balanced transformer 3.
Thus, applying Lenz's theorem, if the current on the secondary side of the balanced transformer 3 is mutated (i.e., the current at the load 4 end is mutated), the secondary of the balanced transformer 3 is The side end (i.e., the load 4 end) generates a counter-electromotive force, and the primary side stable (corrected) current is compared (corresponding) to the secondary side (i.e., the load 4 end). Is effectively suppressed. Thereby, the stability control of the operation of the load 4 and the effect of current balance can be achieved.
At the same time, through the characteristics of the counter-electromotive force of the balanced transformer 3, the undriven (lighted) load 4 raises the voltage to enter the drive (lighted) state, thus driving each load 4 (lighted) ) Is effectively controlled.

That is, as shown in FIGS. 2 to 16, the balanced transformer 3 in each embodiment of the present invention is indicated by (CB), its primary side coil is indicated as (n1), The secondary side coil is indicated as (n2). Other balanced transformers used between known shunt loads are denoted as (BT), and the ballast capacitor applied in FIGS. 2 to 13 is denoted as (C).
Thus, as shown in FIG. 2 of the first embodiment, FIG. 6 of the second embodiment, and FIG. 7 of the third embodiment, the balanced transformer 3 is the next class side of the output transformer T of the inverter circuit 1. Can be installed on the output side and connected in series to the high-voltage side (see FIGS. 2 and 6) and the low-voltage side (see FIG. 7) of the plurality of loads 4 individually by the parallel connection method. The stable (corrected) current output from the circuit 1 is individually shunted to the end of the load 4 for comparison. Thus, the stability of each load 4 is controlled to achieve the current balancing effect.
In addition, as shown in FIGS. 2 and 6, the reference C is a partial pressure and ballast capacitor connected in series with the lamp tube when the indirect driving method is adopted, and when changing to the direct driving method, The ballast capacitor C is erased and not used. 2 and 6 have completely the same circuit structure.

Furthermore, as shown in FIG. 3, in the case of an application used for the extra long lamp tube (high voltage load) of the first embodiment, two output transformers T are connected in series, and the working voltage is set. It is necessary to prevent the occurrence of the high voltage discharge arcing phenomenon of the circuit board. At this time, the lamp tube is floated and grounded at the serial connection position of the two output transformers T, the lamp tube of the floating connection is made the same as the intermediate virtual ground, and the end voltage of the lamp tube is halved. In this way, the stability of the operation of each load 4 is controlled and the effect of current balancing is achieved.
As shown in FIG. 4 or FIG. 5, when a dual lamp or multi-lamp tube package is used as an application for the load 4, the balanced transformer 3 is shared by the same magnetic circuit and combined with each other. Therefore, the load currents of the individual lamp tubes in the same lamp tube set are matched so that the stability of each load 4 is controlled and the effect of current balance is achieved.
Furthermore, as shown in FIG. 8 of the fourth embodiment, the balanced transformer 3 can be installed on the beginner side (input side) of the output transformer T of the inverter circuit 1 and the output transformer can be connected by a mutual parallel connection method. The transformer T and the drive unit 11 are individually connected in series, that is, the balanced transformer 3 can be installed in the inverter circuit between the beginner side of the output transformer 3 and the drive unit 11, so that the drive unit 11 The stable (corrected) current to be output is individually shunted to the load 4 end via the output transformer T and compared. Thus, the stability control of the operation of each load 4 and the effect of current balance are achieved.

As shown in FIG. 9 of the fifth embodiment, the balanced transformer 3 can be installed on the beginner side of the output transformer T of the inverter circuit 1 and is opposed to the output transformer by a tree-like discriminating and increasing arrangement system. T and the drive unit 11 are connected in series, whereby a stable (corrected) current output from the drive unit 11 is individually shunted to the end of the load 4 via the transformer T for comparison. Thus, the stability control of the operation of each load 4 and the effect of current balance are achieved.
Further, as shown in FIG. 10 of the sixth embodiment and FIG. 11 of the seventh embodiment, the balanced transformer 3 can be installed on the beginner side of the output transformer T of the inverter circuit 1 and connected in parallel. According to the system, the output transformer T and the drive unit 11 are individually connected in series, and at the same time, the high voltage of each set load 4 by a well-known balanced transformer (BT) on the next class side (output side) of the output transformer T Side (see FIG. 10) and low pressure side (see FIG. 11). In other words, the balanced transformer 3 corresponds to a group of the load 4 or the output transformer T, and corresponds to the group, and the primary coil in the same group is merged to form a single twin or multiple structure.
Thereby, the stable (corrected) current output from the drive unit 11 is individually shunted to the end of the load 4 via the output transformer T for comparison. Thus, the stability control of the operation of each load 4 and the effect of current balance are achieved.
Next, as shown in FIG. 12 of the eighth embodiment and FIG. 13 of the ninth embodiment, the balanced transformer 3 can be installed on the beginner side of the output transformer T of the inverter circuit 1 and connected in parallel. According to the system, the transformers T having dual output ends are individually connected in series, and at the same time, a known balanced transformer (BT) is connected to the high voltage side (see FIG. 12) and low voltage side (see FIG. 13) of each set load 4. Connected in series, as in the sixth and seventh embodiments, the stable (corrected) current output from the drive unit 11 is individually shunted to the four ends of the load via the dual output transformer T for comparison. . Thus, the stability control of the operation of each load 4 and the effect of current balance are achieved.

As shown in FIG. 14 of the tenth embodiment, the load 4 can be applied in combination with other light emitting components (such as diodes such as LEDs or OLEDs). As shown in FIG. 14 which is a control circuit implementation state instruction diagram of the application and FIGS. 2 to 13, the balanced transformer 3 can be installed on the next level side of the output transformer T of the inverter circuit 1, and Connected individually in series to the low voltage side of the load 4 by the mutual parallel connection method (can also be connected in series to the high voltage side), and thereby the stable (corrected) current output from the inverter circuit 1 is individually supplied to the end of the load 4 Divide and compare. Thus, the stability of each load 4 is controlled to achieve the current balancing effect. At the same time, corresponding to the need for white balance of the backlight board, adjusting the ratio of the number of coils between the first and second level of the balanced transformer 3 connected in series with the light emitting parts of different colors, different color light emitting parts are required The relative luminance ratio can be relatively obtained and maintained (the white balance is not lost due to the aging of the light emitting component).
Further, as shown in FIG. 15 of the eleventh embodiment, the present invention further places the balanced transformer 3 in a control circuit such as a single-phase or multi-phase shunt voltage stabilizing high-efficiency module (VRMs-Voltage Regulator Modules). Can be applied. In the implementation state, the balanced transformer 3 can be installed (inserted) between the switching unit 12 included in the inverter circuit 1 and the external shunt inductor 5 inside thereof, thereby distributing the current to each shunt inductor on average. In addition, the effect of uniformly distributing the entire module heat source is achieved. In this embodiment, the balance transformer and the shunt inductor of the same shunt circuit are integrally combined by the structural design of the iron core and the coil (see FIG. 16), and the DM coupling effect between the primary side and the secondary side (diferential) Using the mode coupling effect (Lc) part, it can be applied as a balanced transformer, and a leakage inductor without a coupling part (leakage inductance, Lk) is used as a shunt inductor to achieve the effect of uniform shunting.

As described above, the technical feature of the present invention is that the balance transformer 3 is used to compare the current at each end of each load 4 with the stable (corrected) current, thereby controlling the stability of the operation of the load 4 and the current balance. The effect can be achieved, and at the same time, the driving (lighting) state of each load 4 can be effectively controlled.
Of course, the present invention is not limited to the above-described embodiments as long as the features of the present invention are not impaired.

It is a basic structure of the current suppression balanced circuit of the present invention and its application instruction diagram. FIG. 3 is a state instruction diagram of a first embodiment in which the present invention is applied to a control circuit. It is another execution instruction | indication figure of the state of the 1st Example which applies this invention in a control circuit. FIG. 5 is still another implementation instruction diagram of the state of the first embodiment in which the present invention is applied to the control circuit. It is another execution instruction | indication figure of the state of 1st Example which applies this invention in a control circuit. It is a state instruction | indication figure of the 2nd Example which applies this invention in a control circuit. FIG. 6 is a state instruction diagram of a third embodiment in which the present invention is applied to a control circuit. It is a state instruction | indication figure of 4th Example which applies this invention in a control circuit. FIG. 10 is a state instruction diagram of a fifth embodiment in which the present invention is applied to a control circuit. It is a state instruction | indication figure of 6th Example which applies this invention in a control circuit. It is a state instruction | indication figure of 7th Example which applies this invention in a control circuit. It is a state instruction | indication figure of the 8th Example which applies this invention in a control circuit. It is a state instruction | indication figure of the 9th Example which applies this invention in a control circuit. It is a state instruction | indication figure of 10th Example which applies this invention in a control circuit. It is a state instruction | indication figure of 11th Example which applies this invention in a control circuit. It is a state instruction | indication figure of the Example which combines the balance transformer and shunt inductor of this invention integrally.

Explanation of symbols

1 Inverter circuit
11 Drive unit
12 Switching unit
2 Detection circuit
3 Balance transformer
4 Road
5 Shunt inductor
C Ballast capacitor
T output transformer

Claims (5)

Mainly applied in control circuit with at least one load, including inverter circuit, detection circuit, at least one balanced transformer,
The inverter circuit is a combination of a drive unit and one or more output transformers, and provides current to the load end,
The detection circuit is connected between the input terminal of the inverter circuit and a current transfer detection point in the control circuit, receives and detects the current amount of the total load in the control circuit, and stabilizes the current amount. Return to the input of the circuit, the inverter circuit outputs a stable correction current,
The primary coil of the at least one balanced transformer receives the modified current output by the inverter circuit, and the secondary coil individually connects the loads in series and uses the balanced transformer, A current-suppressing balancing circuit characterized in that each load-end current is compared with a corrected current output by the inverter circuit, thereby achieving stability control of the operation of the load and current balancing.   2. The current suppression balanced circuit according to claim 1, wherein the balanced transformer can be installed in the inverter circuit between the beginner side of the output transformer and the drive unit.   3. The balanced transformer corresponds to a group of load or output transformers, and combines a primary coil in the same group correspondingly grouped into a single twin or multiple structure. The current suppression balanced circuit described.   4. The current suppression balanced circuit according to claim 1, wherein the load is one or more lamp tubes or other light emitting components.   4. The current suppression balanced circuit according to claim 1, wherein the load is a single-phase or multiphase shunt efficiency module.

Images