TWM277178U - Switching controller having output power limitation and brownout protection - Google Patents

Description

M277178 IX. Description of the new type: [Technical field to which the new type belongs] A switchable control relay with output discrimination and low dragon protection, especially a switchable control device that can limit power wheel output and low-lose hybrid protection . [Previous technology] In the power supply, the pay switching technology is a conventional technology, which can be used to control and adjust the input rate. Various miscellaneous items like dragons and dragons guarding the immortal are built in the power supply benefits to protect the electric responder Langbianwei to avoid permanent damage. The power supply is provided by "The Lost $ 神 _ 的 杂 通 f 侧 _Lai short circuit. ° Refer to Figure-for the conventional circuit diagram of the electric reactor. Among them, the switching controller 仏 is composed of a power-limiting comparator 53, a sewing device 56, and a driving signal generating unit 54 as a source of the driving signal of the power supply 5, such as a control circuit circuit, which controls the integrated circuit. Shang Gu had already described the occasion where the Qian Qian relied on the device. The money source supplier's input crane VlN will be charged through—starting resistor ^ open scale—maintenance capacitor Cst. When the voltage Va on the sustaining capacitor CsT reaches—starting voltage, the switching controller Ui starts to operate. To drive the entire power supply 5. The power supply H 5 »is known as the supply voltage required for the switching control cylinder operation, which is provided by the auxiliary winding Nα of the transformer 1 through the rectification g Da to the maintenance capacitor C4. At this time, the -detection resistor RS Φ is connected to the discrimination gate Q1 ', which is a transformer 1-pass weaving current Ip' which determines that the transformer Q1 is passed as the maximum rotation discrimination of the supplier 5. The method to achieve this is to pass the negative end of the comparator 53 M277178 _ discriminator_ comparator _ discriminator_amp. If the current sensing signal

If the voltage Vcs is greater than the maximum power limit level of the prostitute, the drive shout generating unit 54 will periodically and also limit the maximum output power of the power supply 5. The quantity ε is:

Vm, for example, the output of the drive signal VPWM is disabled at IV ground, and the energy stored in the inductor t of the transformer is 1 s = ~ xLxl = ΡχΤ • • ** ·· #### _ 参 参 鲁 ♦ 鲁鲁鲁 参 ·. .... (1) The maximum output power ρ can be expressed as follows:

I V 丨 Ν +

Ip = -ΧΙΟΝ

Lp »» ··· _ • Lu》 Ρ

Lp 2xT x | p2 = W ^ ..............

2xLpxT ⑵ ⑶ where Ip and Lp are respectively the secondary current and the inductance of the transformer Ti; ^ is the drive signal Vpm_on time when the power switch is on; τ is the switching period of the power switch ③. It can be found from equation (3) that the output power ρ will change with the change of the input voltage I. When safety is taken into consideration, the input power supply voltage of the power supply is tested to 264Vac. The output power limit at higher input power supply voltage (264Vac) is usually higher than that at lower input voltage “toe”, and there are several times the difference between high-power recording. Although the feedback control loop of the power supply can automatically adjust the on time 仏, so that the output power can be maintained at a fixed value. In other words, when #Current_job Ves is higher than the maximum power limit level V «, such as VC (IP xRs-1V), the maximum on-time will be limited and the primary current of the power supply will be limited. . 6 M277178 Furthermore, the maximum output power is also affected by the _moving fiber generation unit 54 _ observation delay time td. -Coordination with the "-" "Please refer to the second picture" is caused by high power input power for transmission. The difference in output power and noise is shown below. "Supply the maximum power limit of n 5 at m level. When the high-voltage input power supply is working, it will generate a current sensing signal with a steep slope ^ and a continuous on-time ^ shorter crane duty w. In addition, the low-voltage input rider will produce a current sensing signal with a slow slope and a driving signal with a long continuous conduction time u. Generally, the moment when the current sensing signal Vcs is higher than the maximum power limit level ($ IV), the driving signal generating unit 54 _ the motion signal VpM will be cut off after a transmission delay time is known. Within this transmission delay time td, the power switch Q! Will be continuously turned on and continue to deliver power. Therefore, the actual on-time of the driving signal v is equal to the secret time. That is to say, 'When the input power supply voltage is high, the actual on-time of the power switch increases, so the actual power limit level VM, HV is higher, which in turn leads to an increase in the output power of the power supply 5. What is particularly clear is that the transmission delay time td is the same in the same power supply at both the south and lower input power voltages.

When the input power voltage is low, the actual on-time of the power switch Q1 will also increase. The actual power limit level VMLV will be lower than the power limit level U when the input power voltage is high. This results in a power supply. 5 Under a wide range of input voltages, there will be several times the difference in output power. The actual output power p is as follows: p -V IN X (t〇N -f to) 2 2 ^ L ^ t ·· 1 ♦ ·· • 袅 虫 M277178 Comparing the above-mentioned formulas ⑶ and ⑷, due to the internal delay time of the wheel 7 in the IC will make the exciting current look at the ground / coffee, and the butterfly will have a larger pants limit. The transmission series _ td is very short, and the frequency f is in the range of I to μ. 'Continuously higher operating frequency, the scale caused by the transmission delay _ td is more intensified. Therefore, the input power depends on Vw. Appropriate ground, so that the input power supply failure will affect the maximum output power. [New content]

With this in mind, the main purpose of this creation is to switch the control device with output power limitation and low dust protection. Its main purpose is to dynamically and dynamically identify the output when the input voltage of the power supply changes. Furthermore, if the input power is too low, the output of the power supply will be stopped, so that the protection of low input power voltage can be achieved. "This creation uses a -hysteresis comparison circuit to receive an equal proportion of the round-in power supply voltage through the input resistance. The low-voltage hysteresis signal controls the drive signal to generate a single X / ίτ stop drive signal wheel 丨 as a protection for the input of the power supply of the electroscope. At the same time, 'this creative use-clamp the voltage generation unit to receive an equal proportion through the input resistance The input power supply voltage is used to output the maximum power limit voltage ... The power limit comparator receives the maximum power limit voltage and the current sensing signal, and performs a record operation. The power output is a power limit δ ΐ number as the output of the power supply. Power limitation. Furthermore, this creation uses the drive signal generating unit connected to the power limit comparator and the power switch to turn the power limit signal, which can turn the drive signal to power. By this, 8 M277178 is used as the input voltage. Pressure change _, the maximum age of the electric power of the gate changes accordingly, thereby prompting the driving signal generating unit to adjust the duty cycle of the driving signal, Limit the primary current of the power supply and reach the output power limit. • When the input power voltage is too low, the hysteresis comparison circuit will compare the too low wheel-in power supply voltage with the hysteresis threshold voltage range value. That is, a low-voltage hysteresis signal is generated, which is used to control the drive-reduction generating unit 彳, stop turning shouting, as a low-loss lion voltage protection. _ A To enable your review committee to further understand the creative characteristics and technical content, please Please refer to the following detailed description and drawings about this creation, but the drawings are provided for reference and explanation only, and are not intended to limit this creation. [Embodiment]: Please refer to the third figure, which is a preliminary implementation. Wei Zhuantu, this creation is used for • Power supply 1 ^ 6 towels, follow-input “change in voltage vIN, and then control the switching action of a power switch α, including the hysteresis comparison circuit 60, clamping voltage generation Unit magic, power • rate_ ratio # 63 and driver generation unit 64. Lion 6M Road 6G through the input resistance & and the divider 2 to obtain an equal proportion of the input power voltage & a mp ;, and compare the ratio of the input power supply dust ^ and-the hysteresis critical range value (lower voltage threshold critical value & ~ upper voltage threshold critical value Vh). At the same time, # equal proportion of the input power source v When the voltage is lower than the lower limit of the voltage VL, the hysteresis comparison circuit 60 outputs a low-level low-voltage hysteresis signal and outputs a high-level low-voltage hysteresis signal when it is higher than the threshold value VH. Ds, to form a signal magnetic π See the above description, the hysteresis threshold voltage range value is 90Vac relative to the input power supply-the upper voltage threshold Vh to the input power supply. M277178 critical value Vl. Referring again to the third figure, the clamping voltage rm core | born early 7062 is composed of-adder 620 connected-limited power & source vRm, obtained through the input band I R2 divided by the input power voltage, Compensating voltage V〇FFSET 'The compensation thunder v.u ^ Shaft i Voffset and the limiting voltage source V are added through 620, and then the wheels "r,, i will output a high-power limiting voltage V ·. Since the input power supply voltage VIN is a -variable value, such as the change between the high input power supply voltage C and the low input power supply voltage. Therefore, the maximum turn _ Jian ν is also a possible value. Through this clamping voltage = sugar_energy of unit 62, the maximum power limit voltage Vlmt, hv can be obtained under low input power supply voltage at high input voltages, where Vlmt, lv is greater than VLMT, HV voltage level. The power limit comparator 63 is connected to the clamping voltage generating unit 62, and receives the changed large power miscellaneous voltage vLMT, and compares the changed maximum power mixed voltage Vlmt with a current sensing signal vcs. To output a varying power limit signal voc. Referring again to the third figure, the driving signal generating unit 64 is connected to the hysteresis comparison circuit 60, the power limit comparator 63, the power switch Q, and the feedback terminal of the power supply to receive the low voltage hysteresis signal. DS and the power limit signal Voc to output a drive signal to the power switch Q. The driving signal generating unit 64 includes a PWM comparator 642, a logic circuit 644, a flip-flop 646, and an oscillator 648. The PWM comparator 642 is connected to the feedback terminal of the power limit comparator 63 and the power supply, and is used to receive a voltage feedback signal VFB and the current sensing signal Vcs, and compare and calculate the voltage feedback signal VFB and The current sensing signal Vcs is used to output a modulation output signal M277178 VP0. The modulation output signal VP0 is transmitted to a logic circuit 644 connected to the output end of the power limit comparator 63. The logic circuit 644 obtains the power limit signal voc and the output signal of the modulation wheel, and performs an AND operation. Logic operation to output a reset signal Vrst. The positive and negative benefits 646 are connected to the hysteresis comparison circuit 60, the logic circuit 644, the oscillator 648, and the power switch Q, and receive the low-voltage hysteresis signal DS, the anti-set signal v anti-τ and a vibration. The full signal CLK is used to output the driving signal% · to the power switch ^. . As mentioned above, the flip-flop 646 ^ D flip-flop is connected to the output terminal rib of the logic circuit 644 to receive the reset signal%, and a clock terminal (ck) is connected to the The oscillator 648 is used to receive the New Signal signal, and an input terminal (d) thereof is connected to the output terminal of the hysteresis comparison circuit 60 to receive the low voltage hysteresis signal ds, and an output terminal thereof is connected to the power switch Q The control terminal is used to output the driving signal v_. XX surplus «CLK & D type positive and negative || Obtain the low voltage hysteresis signal DS ,, 'at the input terminal and present it at the output terminal (Q). At the same time, the logic circuit_output reset signal The logic operation of the device can be passed from the SR type flip-flop or to the reset terminal of the D-type flip-flop, which can adjust the driving signal of the D-type flip-flop output (Q) when overpower occurs. VPWM. The D-type forward and reverse JK type inverter is implemented instead. 2. The change in the high-power limit cage Vlmt will affect the power limit comparator. The rate limit is equal to the rate limit E VO C ′ fine, _ lose 644, and the entire drive news. Caierlin fine & positive and negative with 46 output or no output drive signal. The second picture of the port, please refer to the schematic diagram of the difference in the output power limit level of the high and low voltage input caused by the transmission delay time of Cichilin. The voltage generating unit is clamped in order to divide the high-input power voltage and low _ «to produce the unique green big discriminator I points V_v and VLMT, LV, and the current sense obtained by detecting the resistance Rs _ tiger vcs are Vcshv and ^, LV, respectively Among them, the current sensing signals Vcs hv and% will be compared with the power limit comparators Vlmthv, Vlmt, lv through the power limit comparator 63, and the on-times will be nn4ue_Tiger VpwMHv, VpwM, respectively. In the above description, if the delays caused by the components in the switching controller are considered at the same time, the actual on-times of the high input power voltage and the low input power voltage are wtAW + td, respectively. From the above, it can be known that the voltage clamping function of the clamping voltage generating unit 62 allows the power supply to dynamically change the maximum power limit voltage VLMT under high magic or low voltage input power as a compensation for the output power of the power supply 6. The maximum power limit V is the same, and Ya can get stable and the same output power P. Shifu cooperated with the third picture, please refer to the fifth picture, which is the waveform diagram of the hysteresis comparison circuit for this creation. From f2 to t3, the input power source N is smaller than the upper limit threshold VH. At this time, the input source voltage VIN starts to perform the hysteresis comparison operation through the hysteresis comparison circuit 60. At time ^, the input power voltage VIN is lower than the lower threshold VL. At this time, the hysteresis comparison circuit 60 / outputs the low-voltage hysteresis signal Ds at a low level to control the flip-flop_stop drive signal PWMVPWM output; In addition, at time, the input power source is higher than the voltage upper threshold vH. At this time, the hysteresis comparison circuit 60 outputs the high-level low-light hysteresis signal to control the positive The inverter 646 restores the output of the driving signal VP plane. This creation has a switching control device that removes the power limit and protection. When the power supply voltage of the 12 M277178 reactor is changed, the output is dynamically turned off. If the input power voltage is too low, it will stop. The output can be protected by the power supply voltage of the ship. However, the above description is only a detailed description of the specific embodiment of the best-discussed disk drawing. However, the reading of this creation is limited only. Lin__ Excerpt, all the excerpts should be covered by the following cap patents. The actual changes that are in line with this creation should be included in the scale of this book. Any familiar artist can easily think about the changes or modifications in the field of this creation. Covered in the patent scope of this case below.

13 M277178 [Schematic explanation] The first picture is a schematic diagram of a conventional power supply circuit; the second picture is a schematic diagram of the high and low voltage input power caused by the transmission delay time; Schematic circuit diagram of the preferred embodiment; output power limit under source 54 driving signal generation unit 60 hysteresis comparison circuit 63 power limit comparator 644 logic circuit Cst maintaining capacitor is the transformer VLMT maximum power limit voltage Vp0 modulate output signal VpwM drive The fourth figure of the signal is the schematic diagram of the difference in input potential caused by the transmission delay time of the creative; and the fifth figure is the waveform of the hysteresis comparison circuit of the creative. [Description of symbols of main components] 5 power supply 56 oscillator 62 clamping voltage generating unit 64 driving signal generating unit 646 flip-flop Q switching controller Qi power switch V 0ffset compensation voltage Voc power limit signal Vcs current sensing signal CLK Zhenying signal 53 power limit comparator 6 power supply 620 adder 642 PWM comparator 648 oscillator 1 Rst start resistor Da rectifier Vr limit voltage source Vrst reset signal DS low voltage hysteresis signal 14

Claims (1)

M277178 10. Scope of patent application: L-a switching control device with output power limitation and low voltage protection, which is integrated in a power supply, which depends on the change of the power supply voltage of the driver, and then controls and adjusts the power switch. One of the driving signals includes a hysteresis comparison circuit, which receives an equal proportion of the power supply voltage of the person and the critical hysteresis value of the hysteresis. After a comparison operation, a low «hysteresis signal is output;- The clamping cage generating unit uses a limited voltage source and the changed input power voltage to perform a different operation to output a maximum power limiting power. A power limit is approximately H, which connects the clamping dragon generating unit and the power supply. The -sensing terminal receives the current sensing signal of the maximum power limit electric display, and compares the maximum power limit voltage with the current sensing signal to output a power limit signal; and A driving wealth-generating unit, which is connected to a de-limiting comparator, a surface lag comparison circuit, a feedback terminal of the power supply, the sensing terminal of the power supply, and the power switch. The scale voltage Nathorn, the -voltage_domain and the current sensing signal are used to output the driving signal to the power switch. For example, if you apply for a switching control device with fine discrimination and low health protection, the input power supply voltage and the limit power that are composed of the injection source group and the Qing Jiaqing voltage source will change. After the source is added, the maximum power limit voltage is output. 3. If you are applying for a special M 丨 reported 15 M277178 control device with a low price and a low dragon tilt, the drive signal generation unit includes:-a p-side comparator connected to the power supply The feedback terminal and the sensing terminal receive the voltage feedback signal and the current sensing signal, and calculate and compare the voltage feedback signal and the current sensing signal according to a comparison operation to output-modulate the output signal; a logic circuit , Connected to the power-limiting comparator and the pwM comparator, receiving the power-limiting signal and the modulation output signal for outputting a reset signal; and the positive and negative signals thereof are connected to the hysteresis comparison circuit A reset terminal is connected to the logic circuit, a clock terminal is connected to the _ vibrator and an output terminal is connected to the power switch, which receives the low dragon 1 «, Saga domain, and the ㈣Ca motion signal to the Power switch. 4. The switching control relay with output power limitation and low voltage protection as described in item 3 of the scope of patent application, wherein the flip-flop can be selected from D-type flip-flop, SR-type flip-flop or jk-type One of the group combinations of flip-flops. 5. — A switching control device with output power limit, used in a power supply, follows-changes in the input power voltage, and then controls and adjusts a power switch-the drive includes:-Orange voltage generating unit ， It is a voltage source that performs calculations with the transformer to output the maximum power limit cage. $ The original electric power limit comparator is connected to the clamp generator unit and the power supply: the test terminal, which is connected to the Distinguish the display-electricity_signal, and compare the current sensing signal of the maximum power-limiting electrical display with the comparison operation for the round-out-power-limiting signal 16 M277178 -The driving signal generating unit is connected to the identification limit ^, a feedback terminal of the power supplier, the sensing terminal of the power supply and the power switch, which receive the power limit signal,-voltage feedback The signal and the current _ signal, output the transfer signal to the power switch; by this, when the input power supply voltage changes, the maximum power limit voltage will be changed accordingly, so as to adjust the hybrid power Jiannen adjusted the driving signal generation unit to lose tn, and switched to the job, bribe the ship to follow the primary current of the power supply. 6. The switchable control device with output discrimination limit as described in item 5 of the patent application, including-magnetic miscellaneous comparison circuit, which is the receiver's power supply and the value of the critical voltage range. After the comparison operation, a low-voltage Lin signal is output or turned off. 7. According to the application for Wei, the Na-type control with output power is difficult to set up, where The clamping voltage generating unit is composed of an addition-limiting voltage source, and the adder adds the variable input power voltage to the limiting voltage source and then outputs the maximum power limiting voltage. Switching control device of Μ, which has the output power limitation as described in Item 5 of the application. The drive signal generating unit includes a PWM comparator connected to the feedback terminal of the power supply. And the sensing end, the voltage feedback signal and the electric subtraction measurement signal are received, and the voltage Lai signal and the current sensing signal are calculated based on the comparison to output a modulation output signal; 17 M277178 a logic circuit 'connection In the identification comparison II and the PWM taste, it is to receive the power limit signal and the modulation output signal for outputting a reset signal; and for the tiger 'to fine-tune the driving signal, the input is an input The terminal is connected to the hysteresis comparison circuit, a reset terminal is connected to the logic circuit, and the financial threat is cautious, and the side is discerned to receive the low-voltage hysteresis signal, the reset signal, and a Zhenying No. 1. To the power switch. 9. The forward and reverse device with output power limitation as described in item 8 of the scope of the patent application may be selected from the group consisting of D-type forward and reverse devices, SR-type forward and reverse, and ▲ clothes-making equipment. Group combination 18