TW545084B - Zero voltage switching apparatus of AC gas discharge lamp stabilizer - Google Patents

Abstract

The present invention provides a zero voltage switching apparatus of AC gas discharge lamp stabilizer. The invention includes a DC/AC converter and a signal controller. The DC/AC converter contains at least the serially connected upper switch and the lower switch, in which the serially connected switches are disposed to cross the positive and negative terminals of a DC power source. In addition, one end of an inductor is connected between the upper and the lower switches; and the other end of the inductor is connected to an output capacitor. In addition, a signal controller is used to detect the inductor current, so as to control the conducting or cutting-off state of the upper and the lower switches according to the output direction and input direction of the inductor current. When one of the switches is cut off, the other switch conducts in the state of zero voltage. The invention is featured with that it is difficult to cause power loss due to hard switching, and has the advantages of having the capability of decreasing volume and reducing cost.

Description

545084

[The invention belongs to the field of the invention, and particularly to the technical field] An AC gas, zero voltage switching device for a discharge lamp stabilizer. The control device is the opposite of the gas flow control. Therefore, the device circuit is made, and its main circuit is to control the stable AC when it reaches the pre-current start of the discharge lamp ballast. The former is easy to use by fewer and fewer people. The architecture system can be mainly divided into generating audio common while the use of the latter includes a current control as shown in the first figure, high-frequency resonance vibration, unstable circuits and systems are increasingly used. Convenience (Hz) counts as the first One liter, until it passes the traditional intersection of the two poles of the prior art and the low-frequency electrical degree is high. The low-frequency diagram of the inverter-controlled step-down circuit is shown in the low-frequency diagram. The peak current body D1, the output of the circuit is determined by the direct current. After setting the value of the wave current switch S1, the current control circuit is a stable DC current, and the current is switched to about 180 Hz. When the circuit of the control device is turned on, the switch S 1 is turned off on the current of the inductor L 1, at this time When the switch S1 is turned on again, a very large breakthrough current will pass. Part of the breakthrough current is from the switch stray capacitor discharge, and the other part is due to two The D1 reverse recovery is not fast enough to cause a short-circuit current to pass, that is, it will easily cause switching loss when switching, and become the main source of electromagnetic radiation, and because the switch S1 must use high frequency when switching Switching, its frequency is generally about 2 0 0 0 ~ 6 0 0 0 0Hz, so the power conversion with the inverter circuit will have a high amount of power loss; Among them, the main role of the inverter circuit is only to convert the current Reverse, that is, when switch S2 and switch S5 are on, switch S3 and switch S4 are off, current flows in one direction, and when on

545084 _Case No. 90133512_ 年月 日 __ V. Description of the invention (2) When S2 and S5 are turned off, switches S3 and S4 are turned on, the current flows in the opposite direction, and a stable low-frequency AC square wave current is output. . However, in the above circuit design, since five transistor switches must be used, the cost is high, and the large size of the control device is lacking. Because the switching of the switch S 1 is hard switching, the power loss is considerable. Big. Therefore, the present invention proposes a zero-voltage switching device for an AC gas discharge lamp ballast based on the above-mentioned problems.

(3) [Content of the invention] The main purpose of the present invention is to propose a zero-voltage switching device for an AC gas discharge lamp ballast. With its zero-voltage switching design, it is difficult to switch between DC current and AC current. Switching causes loss of electricity and generates electromagnetic radiation. Another object of the present invention is to provide an AC gas discharge lamp stabilizer control device using a smaller number of electronic components, so as to have the advantages of reducing the volume and reducing the cost.

According to the present invention, a zero-voltage switching device of an AC gas discharge lamp ballast includes a direct-current converter, which includes at least one upper switch and at least one lower switch, and the upper-lower relationship is connected in series with each other and across a DC power source Positive and negative terminals, and one end of the inductor is connected between the upper and lower switches, and the other end of the inductor is connected to an output capacitor, and a signal controller is used to detect the current of the inductor in order to The output and input directions control the on or off state of the upper and lower switches, so that when one switch is turned off, the other switch is turned on at zero voltage.

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The following detailed description with specific examples and accompanying drawings makes it easy to understand the purpose, technical content, characteristics and accomplishment of the present invention: work (four), [implementation] As shown in the second figure, one The control device 20 includes an AC switching switch 22, which includes four transistor switches including a first upper switch Slu, a first lower switch 311 ^, a second upper switch S 2 U, and a second lower switch s 2 L. The upper switch S1U and the first lower switch S1L are connected in series to form a first circuit 24, and there is a second circuit 26 between the second upper switch S2U and the second lower switch S2L, and the first branch circuit 24 and The second branch 26 is connected in parallel in two, and the parallel points of the first and second branches 24, 26 are respectively connected to two positive terminals (p +) and negative terminals (N-) with different potentials. There are π, 2r ... on the serial contacts between the switches of Yigu Road, No. 24 and No. 26, respectively. The two circuit terminals 27 and 2 are connected in series with-output capacitor C, and the two terminals of capacitor C are passed through an ignition circuit. Connect the output lamp 50; and use the -signal controller 2δ to detect the difference between the upper and lower limits of the target current The current value is based on: Electricity: The four switches S1U, S1L, S2U, S2L are turned on or off to limit the current limit *. Among them, the above-mentioned transistor switch Slu is the second-thinest thin, the first bottom-secondary: lS2vs2l The middle '-body D㈣ the second lower diode D2L is the base diode of the first-diode S1U, the lower-diode switch S1L, and the second-diode switch f1, which are in the same branch: The on switch and the lower switch cannot be turned on at the same time. You must turn on the upper switch to turn off the rm ·.

The upper side of the circuit is turned on and the lower side of the positive voltage of the direct current power supply 23 is connected to the off side. The output terminal voltage is directly output in the form of a fast wave following the positive terminal voltage and the negative terminal voltage. Only when the switch is turned off, the output voltage is grounded. When the lower switch is turned on, the negative voltage of the upper open-current power supply 2 3 is switched. Therefore, fast switching will make the output voltage equal to the above. The filter of the inductor L and the capacitor c, and the furnace and wave inductance L are small and the filter capacitor C is large, so that the inductance [current shape is -triangular wave 40, as shown in the third figure, and the signal controller is calculated and calculated as The upper limit current 44 and the lower limit current 46 shown in the figure. When the inductor L current detected by the signal controller 28 is positive, the signal controller 28 drives the first upper switch S1U and the second lower switch S2L to be turned on and the second upper switch. When S2U and the first lower switch S1L are turned off, so that the current rises and reaches an upper limit of 44, the upper switch S1 ϋ and the lower switch S 2 L are turned off, and the current passes through the second upper pole D2U and the second The square diode D1L passes, so that the second upper switch S 2 U and the first lower switch S1 L can be turned on at zero voltage, and the inductor current starts to decrease at this time until the current of the inductor L drops below zero and reverses. Above Turn off S 2 ϋ and the first lower switch s 1 L to turn off. At this time, the current can pass through the first upper diode D1U and the second lower diode D2L to make the first upper switch S 1 U and the second lower switch. The switch S2L can be turned on at zero voltage; therefore, the detection or detection of the current by the signal controller 28 and the control of the four switches § 1 u, S 1 L, S 2 U, S 2 L can be turned on or off to control the triangular wave 4 〇 The upper limit current 4 4 is always at a positive current value, while the lower limit current 46 is always at a negative current value, and the average current value of the triangular wave 40 current is close to the target current 42 required by the gas discharge lamp.

Signal controller

Page 545084

Case No. 90 12 V. Description of the invention (5) 28 The structure is explained. As shown in the fourth figure, the signal control ㈣ includes a current detection benefit 30. After detecting the current of the inductor L and taking the detection value, Current detection side value is distributed to 一, ^ nT H Lian Han has a filter current product / knife benefit (current PI controller) 34 and a current ratio of the current integrator 34 and-current direction switcher-a target Current 42 to current integrator 34 ;: Department of migration "Disaster current 4 2 is equal to the difference between your currents and calculated by the current integrator 34" Ten Junsong 恻 current limit value m live circuit current limit value, and the electrical lower limit Current 46 value; when the current limit value is the upper limit current 44 value and value, and the lower limit current 46 value is set to a limit current 44 ^ j shell value When the current limit value is negative, the lower limit current 46 value is used, and the upper limit value is set Is a small positive value; and the current comparator 32 compares the upper and lower limit current values with the current detection value to generate a switch control signal to a switch controller 36; when the current detection side value is greater than the upper limit current value, the first The upper switch S 1 U and the second lower switch s 2 L are turned off and the first switch The square switch S 1 L and the second upper switch g 2 U are turned on '▲ When the current detection side value is smaller than the lower limit value, the first upper switch S 1 u and the > lower switch S 2 L are turned on and the first lower switch S is turned on 1 L and the second upper switch s 2 U cut-off ° In the present invention, since the DC current and the AC current in the AC gas discharge lamp are generated by the zero-voltage switching method, it is not easy to cause considerable power due to hard switching. Loss, and because the number of transistor switches used in the present invention is small, it also has the advantage of reducing the volume and saving costs. In addition to the design of the full-bridge circuit structure described above, the DC-AC converter 2 2 ′ of the present invention may be a half-bridge circuit structure, as shown in the fifth figure, where the DC power supply 2 3 series includes three devices. Power contacts with different potentials are the positive terminal with the highest potential, the centerline with intermediate potential, and the most -__ MM 90133512 __ ^ 1. Description of the invention (6) m --1 The half-bridge circuit is connected to an upper switch S3 and a lower switch S4. The straight AC converter 22 includes a positive terminal connected to a DC power source 23, and "S3, S4 are connected in series with each other and at the foot. Connected and the lower switch S4 Jindi, ~ 'make the upper switch M S3 and the power S4 and set a thunder "private A, the negative terminal is connected, in the second switch S3, the capacitor C is connected to the middle / and point 5 2, which is connected in series with an inductor L · and an output circuit 48 and is connected to the output terminal, and the two ends of the output capacitor L pass an ignition current L to control -I g 'using a signal controller 28 to detect The lower diode D4 is # / S3, S4 respectively, and the upper diode D3 and the one, the upper and lower switches S3 The upper, lower, and upper switches S3, S4 are put on and off first. The on or off state of S4 is complementary, that is, put on first. The upper switch S3 = the switch S4 is turned on. Similarly, the lower switch is turned on. When the S4 switch S4 is turned off, the private switch is turned on, and when the upper switch S3 is turned on and pressed down, when the voltage at the lower end of the switch S4 ^ is the direct current power source 2 3, the positive terminal is the negative # of the direct current power source 23 and the upper switch S3 At the time of cut-off, the upper and lower switches of the output terminal voltage switch 5 ^; and the above-mentioned half-bridge structure of the straight AC converter 28 is controlled. The turning on or off of S 4 is also controlled by a signal when the β current flows up and down. 42 The momentary current input is turned on at this time,

Therefore, the current can be passed through the upper diode D 3, because when @ S3, S4 are switched alternately, a target electric current is generated to ~ 2 '. The output voltage is a crossing wave through the electric valley C and the inductor L, so the current flows through The shape of the rising wave 40 is generated when the upper switch S3 is turned off, so the electricity ^ r drops' is the peak of the triangular wave 40. At this moment, the instantaneous electric switch S4 can be zero 1L $ passed the diode D4 below the square switch. The lower switch S4 must be turned on. 'At this time, when the current drops to the current reverse direction, the instantaneous current is Daizhi', that is, the current rises from the bottom of the triangle wave 40. 545084 A dry repair _ V. Description of the invention (7) _ Pass, so that Switch s 3 can be turned on with zero voltage, which is used to detect the current of the inductor, and it is used to calculate the current of the middle and the controller 28. Sf: Calculate the lower limit current value to cut off \ upper and lower open: the value to cut off the upper ^ H ^ J0133512-U% ", u _ ^ 口 | and the upper limit electric switch and the upper limit electric switch SJ, 'calculate the lower limit current value to the cutoff lower value I value forever, and 1 off S 4 ;, -Square wave head :: The current limiting value is always negative, the heart '丄 丨… again as above; ^ 42: ~ The current will approach the design , And use the system in addition to the above-mentioned utilization plan. … And using the DC terminal current detection method to suppress the flooding terminal current detection, but the above method is used to limit the life of the present invention [only the shape described in the preferred embodiment of the present invention, 2 of 2 range. Therefore, everything based on this two sentences, not decoration, should be included in this ::, characteristics and spirit; poor patent application model number description: 1 within the scope of the patent application, such as changes and repairs 10 control devices. Inverter circuit control device 12 Current control circuit DC power supply 22 Straight AC conversion circuit 2nd branch 24 1st branch circuit end 27 Circuit end 1 current detector 28 signal controller 危 > critical integrator 32 current comparison L current direction switch 36 40 Switch controller 1 standard current °° Diagonal wave 44 upper limit current ignition circuit 52 circuit creep ❿ Ό 5 5 〇 lower limit current out of the lamp page 11 points

545084 _Case No. 90133512_ 年月 日 __ Brief Description of Drawings Description of Drawings: The first drawing is a schematic diagram of the circuit design of a conventional control device. The second figure is a schematic diagram of the circuit structure of the present invention. The third figure is a voltage and current waveform generated by the present invention. The fourth figure is a block diagram of the current control signal generator of the present invention. The fifth figure is a schematic diagram of another embodiment of the circuit structure of the present invention.

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Claims (1)

545084 _Case No. 90133512_Year Month__ VI. Scope of patent application 1. A zero-voltage switching device for an AC gas discharge lamp ballast, comprising: a DC power supply, which includes at least three power supply connections with different potentials Point 'There is at least two series upper and lower switches across the power contact with the rfj potential and the power contact with the lowest potential, and a circuit end point is provided between the two upper and lower switches. It is connected in series with at least one inductor and at least one capacitor, and is connected to the power source contact with intermediate potential, and two ends of the capacitor are connected to an output lamp via an ignition circuit; and a signal controller 'its The current of the inductor is detected, and the on and off states of the upper and lower switches are controlled according to the input and output of the inductor current, so that when one of the switches is on, the other switch must be off, and when the current When it is an output, the switching of the upper and lower switches is switched from a state where the upper switch is turned on and the lower switch is turned off to a state where the upper switch is turned off and the lower switch is turned on, and when the current is When switching on, the switching of the upper and lower switches is switched from the state where the upper switch is off and the lower switch is on to the state where the upper switch is on and the lower switch is off, so as to control its average current to approach the output lamp. Target current value. 2. A zero-voltage switching device for an AC gas discharge lamp ballast, comprising: a DC power supply comprising at least two power contacts with different potentials; and at least two branches across the power contacts. 'And each of the branches is connected in series with at least two upper and lower switches, and a circuit terminal is provided between the two switches in each branch, and at least one inductor is connected in series between the two circuit terminals. And at least one capacitor, and two ends of the capacitor are connected to an output lamp via an ignition circuit; and Page 13 545084 _Case No. 90133512_ Year Month Amendment_ VI. Patent Application Scope A signal controller that detects the current of the inductor and controls the conduction of the upper and lower switches based on the input and output of the inductor current and Off state so that when one of the switches is on, the other switch must be off. When the current is output, the upper and lower switches are switched by the upper switch and the lower switch is off. Until the upper switch is turned off and the lower switch is turned on, and when the current is input, the switching of the upper and lower switches is switched from the state where the upper switch is turned off and the lower switch is turned on to the state where the upper switch is turned on and the lower switch is turned on The switch is in the off state in order to control its average current to approach the target current value required by the output lamp. Page 14