CN101662210A - Constant current constant voltage power controller and encapsulation and supply converter thereof - Google Patents
Constant current constant voltage power controller and encapsulation and supply converter thereof Download PDFInfo
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Abstract
The invention discloses a constant current constant voltage power controller and a supply converter thereof. The constant current constant voltage power controller comprises three pins: a supply pin VDD, a switch control pin GATE and a ground pin GND, wherein the GND ground pin is connected with a resistor RS, and the GATE pin and the GND pin are connected with a switch tube T1; the power controller further comprises a voltage difference detection module, a secondary pole detection module, a constant voltage constant current control module and a driving stage module, wherein the voltage difference detection module detects the voltage difference between the VDD pin and the GND pin when the switch tube T1 is turned on and cut off; the secondary pole detection module clamps the voltage of theGATE pin when the switch tube T1 is cut off so as to enable the voltage to be smaller than the breakover threshold voltage of the switch tube T1, and at the same time, the secondary pole detection module detects the current passing through the GATE pin so as to further detect the secondary output voltage and the secondary demagnetization pulse width. The invention can reduce the system cost of aflyback converter. In addition, the invention also provides a pin multiplexing method, and therefore, the cost of a control chip of the flyback converter can be greatly reduced.
Description
Technical field
The invention belongs to the integrated circuit (IC) design technical field, relate to a kind of power controller, relate in particular to a kind of constant current constant voltage power controller and encapsulation thereof; In addition, the invention still further relates to the supply convertor that comprises above-mentioned constant current constant voltage power controller.
Background technology
Supply convertor is a requisite assembly in the electronic system.As everyone knows, supply convertor comprises linear transformations device and two kinds of main types of switching power converters, can be divided into isolated and non-isolated two types on conversion regime again.Switching power converters can be realized high conversion efficiency, thus in obtained widely using to large-power occasions, and in the small-power occasion system below several watts particularly, based on linear quantizer.In recent years, in present small-power occasion, switching power converters also begins progressively to replace linear quantizer, and one of them key factor to be exactly switching power converters begin on system cost progressively near the cost of linear quantizer.In present energy-saving and cost-reducing today that becomes trend, become trend of the times with high efficiency switch supply convertor instead of linear converter.In the Switching Power Supply occasion, what extensively be suitable for is isolated converter, because the isolation type switching power supply converter can protect load to avoid the impacting with high pressure and the damage of inlet highway, possesses in telecommunications wireless network, automobile and Medical Devices widely and uses.In the various topologys of isolated converter, because anti exciting converter (flyback converter) topology need not output inductor, circuit structure is simple, output is isolated, cost is low, occupy very high ratio in the application of terminal equipment, Fig. 1 has shown traditional isolated anti exciting converter application drawing that can be applied in the charger occasion.Fig. 2 is this system power voltage curve of output.
As can be seen from Figure 1, usually the sampled signal of isolation type switching power supply converter output voltage adopts the optocoupler feedback to realize that (CV, Constant Voltage0 comprise TL431 and isolated feedback compensating network thereof to the output constant voltage, also has secondary constant-current (CC, Constant Current) control circuit.As can be seen from Figure 1, adopt the anti exciting converter complex circuit designs that can be applied in the charger occasion of isolated feedback, application cost is higher, is not suitable for being applied to the small-power occasion.In the anti exciting converter topology, former limit modulation (PSR, Primary Side Regulation) technology occurred in recent years, former limit modulation technique need not secondary optocoupler, and secondary control circuits such as T1431 and secondary constant-current are so system cost greatly descends.Because in small-power charger occasion, small size and low cost are the factors that direct requirement is considered, such as for 3, the charger for mobile phone of 5W, resistance and cost all are very important, let alone the big or small of PCB and other some factors.
Released the IC of the former limit of a lot of employings modulation technique in the market, these IC based on system works at discontinuous mode (DCM, Discontinuous Conduction Mode), adopted different constant current constant voltage (CC/CV) control, had at present a lot of China and foreign countries patent with the document description of delivering different implementations, such as patent CN200810093354.X, CN200610057268.4, or the like, just enumerate no longer one by one at this.Its main thought is as follows:
Suppose that system works under discontinuous (DCM) pattern, its power delivery equation is:
In above-mentioned equation, P is a power output, and Vo and Io are respectively system's output voltage and electric current, η is system's conversion efficiency, and Lm is a transformer inductance, and fs is a system frequency, Ipk is the peak value of system's inductive current in each switch periods, and we are assumed to the peak value of former limit inductive current in following formula.Under the DCM pattern, following Fig. 3 of signal waveforms in the switch periods:
In Fig. 3, chip internal need produce an erase signal DEM, writes down transformer inductance erasing time Tdem in each switch periods, utilizes this information to do CC/CV control.
Suppose that system enters the CC pattern, at this time has:
Under the CC pattern, need make Io is steady state value, and this value needs and Vo, Lm, and input line voltage all has nothing to do.As everyone knows, under the DCM pattern, transformer erasing time Tdem and output voltage V o, the relation of Lm is as follows:
In following formula, Np and Ns are respectively the former limit of transformer and the secondary number of turn.In conjunction with (2) (3) formula, have
By (4) formula as can be known, realize that CC has two kinds of methods, a kind of method is PFM (Pulse FrequencyModulation) control, and specific implementation is: making Ipk is fixed value, and the product that makes fs and Tdem in addition is a constant.Io is constant like this, and with output voltage V o, transformer sensibility reciprocal Lm and input line voltage all have nothing to do.Second kind of method that realizes CC is PWM (Pulse Width Modulation), and specific implementation is, making fs is fixed value, and the product that makes Tdem and Ipk in addition is a constant, just by detected Tdem information modulation duty cycle.No matter be PFM, or PWM, all be to realize by overcurrent protection OCP (Over currentprotection), difference is exactly: in PFM, the compare threshold of this overcurrent protector is a fixed value; In PWM control, this overcurrent protection compare threshold is a changing value, modulated by Tdem.In these two kinds of implementation methods, all need the transformer inductance electric current is accurately detected, otherwise can cause CC deleterious (as can be known) according to 4 formulas.
After CC realizes, can realize CV, as long as before Tdem finishes to the land regions of assisting winding Naux output voltage sample (as shown in Figure 3 " platform sampling "), in specific implementation, can utilize the voltage (winding voltage in Fig. 1 before the rectifier diode D1) of auxiliary winding Naux in the electric resistance partial pressure sample graph 1, this voltage is proportional at value and output voltage that GATE closes the land regions before demagnetization finishes of having no progeny, proportionality coefficient is auxiliary winding and secondary winding turn ratio, i.e. Naux/Ns.The information of voltage that utilization samples carries out CV control.
In sum, in isolated former limit modulation constant-current constant-voltage controller, need sampling transformer inductance demagnetization information in power controller, to obtain the demagnetization pulsewidth.Utilize this demagnetization pulse width information to carry out CC/CV and handle, method can have PFM or PWM, and the both needs accurately to detect the transformer inductance electric current to obtain accurate CC value.
So far, adopt such scheme and version thereof and the former limit control constant current constant voltage chip that designs has the encapsulation of eight pins of a lot of employings, the perhaps encapsulation of six pins has the encapsulation situation of four pins at least.The more chip costs that mean of pin big more more.In four pin schemes, release the LNK632 that U.S. PI company is arranged in market at present.Wherein the LNK632 chip of U.S. PI company adopts former limit control technology, integrated constant current constant voltage function, and the integrated high voltage power switch pipe, its application drawing is illustrated in fig. 4 shown below:
In Fig. 4, LNK632 is integrated high-voltage circuit breaker SW1 utilizes the drain terminal D on the conducting resistance of high-voltage circuit breaker to give chip power supply simultaneously when starting.In Fig. 4, the chip power pin is the BP/M end, and the ground pin is the S end.The CC/CV module of chip is accepted voltage FB terminal voltage and D terminal voltage, and wherein FB voltage obtains by divider resistance R1 and R2 from auxiliary winding Naux, and the pressure drop on the conduction impedance when power tube SW1 conducting of D terminal voltage.Be modified to exact value by conduction impedance, can obtain the precise information of the former limit of transformer winding Np electric current, thereby realize CC/CV control SW1.
The framework of Fig. 4 has the conduction impedance of individual shortcoming: SW1 to need accurately to revise, and this design brings great difficulty, and the conduction impedance of while SW1 varies with temperature very big, so system's CC precision is subjected to very big influence.Can there be the heating situation in the framework built-in power pipe of Fig. 4 in addition, and the power bracket that makes it use is very little.
The ACT35 of U.S. skill neck (Active-semi) company also is the chip of the former limit modulation of another money four pins band CC/CV function on the market so far, and its scheme is illustrated in fig. 5 shown below:
In system shown in Figure 5, the system power switch is NPN pliotron T1.The chip power pin is a vdd terminal, and the ground pin is the G end, conducting or the shutoff of SW end control T1.When SW makes the T1 conducting, the electric current of former limit winding Np is by the T1 chip internal transistor M2 that flows through, M1 is a detection transistor more much smaller than M2, by being similar to the mode of current mirror, the electric current that making flows through detects transistor M1 is proportional with the electric current of the M2 that flows through, the electric current of M1 changes into voltage through chip internal resistance R s more like this, and this voltage has just been represented the electric current ground information of the Np that flows through.The CC/CV module of chip is accepted the voltage on voltage FB terminal voltage and the chip internal current sampling resistor Rs, as shown in Figure 4.Wherein FB voltage obtains by divider resistance R1 and R2 from auxiliary winding Naux.
The framework of Fig. 5 has the coupling of individual shortcoming: M1 and M2, and Rs needs accurate correction.Otherwise can make the current detecting of the Np that flows through error occur, thereby have a strong impact on the CC precision of system.Can there be the heating situation in the built-in turn-on transistor M2 of the framework of Fig. 5 in addition, and the power bracket that makes it use is very little.
In sum, former so far limit control chip or number of pins are all many, thereby the Chip Packaging cost is increased greatly, though number of pins is few, but current sense resistor is built in chip, very big with temperature and technique change, cause CC point precision not high, and owing to detect the power bracket that resistance heating meeting limited chip is used.Therefore need a kind of number of pins few, can realize the scheme that accurate CC is ordered again simultaneously.
Summary of the invention
Technical problem to be solved by this invention is: a kind of constant current constant voltage power controller is provided, realizes the control of former limit by three-prong is multiplexing, reduce the Chip Packaging cost.
Simultaneously, the invention provides the encapsulation of above-mentioned power controller.
In addition, the present invention also provides the constant current constant voltage power controller that comprises above-mentioned constant current constant voltage power controller.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of constant current constant voltage power controller, the pin of this power controller are three: power pin VDD, switch control pin GATE, pin GND; Described GND pin meets a resistance R S, and described GATE pin, GND pin connect a switch transistor T 1; Described power controller further comprises voltage difference detection module, inferior utmost point detection module, constant pressure and flow control module, driving stage module; Described voltage difference detection module connects VDD pin, GND pin, detects the voltage difference between VDD pin, GND pin when detecting described switch transistor T 1 turn-on and turn-off; Described utmost point detection module is when described switch transistor T 1 is turn-offed, and the voltage of clamper GATE pin makes it less than described switch transistor T 1 on state threshold voltage, detects the electric current that flows into the GATE pin simultaneously, and then detects time utmost point output voltage and secondary demagnetization pulsewidth.
As a preferred embodiment of the present invention, described power controller comprises overcurrent protection module OCP, constant voltage control module, constant current control module, Logic control module, voltage clamp module, output voltage sampling module, demagnetization detection module; Overcurrent protection module detects the voltage difference between VDD pin, GND pin when detecting described switch transistor T 1 turn-on and turn-off, and the voltage difference the when voltage difference between switch transistor T 1 conducting VDD pin, GND pin and switch transistor T 1 turn-offed between VDD pin, GND pin, the difference between these two voltage differences produce the overcurrent protection signal during greater than set point; Logic control module is in order to the switching of control constant voltage control model and constant current control model; And produce control signal and, and receive the overcurrent protection signal after by driving stage on-off switching tube T1 via the turn-on and turn-off of driving stage control switch pipe T1; The voltage clamp module is in order to when switch transistor T 1 is turn-offed, and the voltage of clamper GATE pin makes it less than described switch transistor T 1 on state threshold voltage, detects the electric current that flows into the GATE pin simultaneously; The output voltage sampling module is in order to the sampling secondary output voltage; The demagnetization detection module is in order to detect the demagnetization pulsewidth of transformer secondary output inductance; Described overcurrent protection module, Logic control module, driving stage module connect successively; Described constant voltage control module, constant current control module are connected with Logic control module respectively; The voltage clamp module is connected with output voltage sampling module, demagnetization detection module respectively, and the output voltage sampling module is connected with the constant voltage control module, and the demagnetization detection module is connected with constant current control module, output voltage sampling module respectively.
As a preferred embodiment of the present invention, described overcurrent protection module comprises amplifier feedback unit, K switch 1, comparator C 1, capacitor C vdd; An input of described amplifier feedback unit is the threshold voltage Vref of overcurrent protection module OCP in succession, and another input connects its output, and the output of amplifier feedback unit connects K switch 1; The end of described capacitor C vdd connects the VDD pin, and the other end connects K switch 1; One input of described comparator C 1 connects K switch 1, and another input connects the GND pin; Threshold voltage Vref is sampled and remains on the capacitor C vdd by amplifier feedback unit and K switch 1; The control signal of K switch 1 is PFM signal or pwm signal, depends on that system's CC pattern is to adopt PFM control or PWM control; When PFM signal or pwm signal on-off switching tube T1, the voltage difference of threshold voltage Vref and VDD pin is sampled and remains on the Cvdd; After PFM or pwm signal were opened switch transistor T 1, the current value of former limit inductance Np increased gradually; When the current value of former limit inductance Np greater than Vref/Rs, the voltage of GND pin is also greater than Vref, comparator C 1 upset this moment, thereby on-off switching tube T1; The voltage of described GND pin is the voltage of Rs, has also represented the current value of former limit inductance Np.
As a preferred embodiment of the present invention, described demagnetization detection module comprises voltage clamp module, current-to-voltage converting circuit, demagnetization pulse width signal generation module; The two-way output of described voltage clamp module inputs to current-to-voltage converting circuit, demagnetization pulse width signal generation module respectively; The voltage clamp module connects the GATE pin by a K switch 11; Current-to-voltage converting circuit connects the constant voltage control module, and demagnetization pulse width signal generation module connects the constant current control module, and the output signal of constant voltage control module, constant current control module inputs to Logic control module; The output signal of Logic control module inputs to demagnetization pulse width signal generation module, driving stage module respectively; The output signal of demagnetization pulse width signal generation module connects K switch 11; The voltage clamp module is vised GATE voltage after demagnetization pulse width signal generation module is opened K switch 11, make it to be lower than the threshold voltage of switch transistor T 1, sampling simultaneously flows into the electric current of GATE, its mirror image is output as output current Iout1 and output current Iout2, wherein output current Iout1 offers the constant voltage control module after changing through current-to-voltage converting circuit, output current Iout2 and PFM or pwm signal produce demagnetization pulse width signal DEM together, demagnetization pulse width signal DEM sends into the constant current control module on the one hand, on the other hand the turn-on and turn-off of control switch K11; The output of constant voltage control module, constant current control module is delivered to the driving stage module through generation PFM or pwm signal after the logical operation.
As a preferred embodiment of the present invention, described voltage clamp module is transistor M1, transistor M1 also is connected with transistor M2, transistor M3, transistor M2 connects transistor M4, transistor M5, transistor M3 connects an input of a current comparator, and the output of this current comparator connects a demagnetization logical circuit; The end of transistor M5 connects the constant voltage control module, reaches a capacitor C 1 by a K switch 21 simultaneously by resistance R 1 ground connection, an end ground connection of capacitor C 1, and K switch 21 can be by sampled signal sample control; Magnetic pulse width signal DEM input sample signal generating circuit, sampled signal produce circuit described sampled signal sample of output before the demagnetization pulsewidth finishes; After being triggered, described demagnetization pulse width signal DEM opens K switch 11, detect the electric current of the GATE end of flowing through by transistor M1 and K switch 11, then this electric current is delivered to current comparator by transistor M3 mirror image, after electric current is less than certain threshold value, again with upset of demagnetization pulse width signal DEM signal and stopcock K11, the width of demagnetization pulse width signal DEM signal has been represented the time of transformer demagnetization, and this pulse width information is used for carrying out constant current control; Simultaneously, in this demagnetization pulsewidth, by transistor M1, M2, M4, M5 and resistance R 1, convert the output current information that samples to information of voltage, and before the demagnetization pulsewidth finishes, it is stored on the capacitor C 1, the information of output voltage before on behalf of the transformer demagnetization, this voltage finish, this information is used for carrying out constant voltage control.
A kind of supply convertor, this supply convertor comprises
One primary inductance Np;
One auxiliary induction Naux is with the mutual magnetic coupling of described primary inductance Np;
A level inductance Ns is with the mutual magnetic coupling of described primary inductance Np;
One switch transistor T 1, the grid of this switch transistor T 1 or base stage are received the switch control pin GATE of constant current constant voltage power controller, the source class of this switch transistor T 1 or emitter by one externally current sense resistor Rs receive the ground of supply convertor preliminary survey, the voltage on this current sense resistor Rs is received the ground pin GND of constant current constant voltage power controller simultaneously; The grid of this switch transistor T 1 or base stage are connected to the signal end of auxiliary induction Naux by an external feedback resistance R _ f b; The signal end of this auxiliary induction Naux offers the power controller power supply after by a diode D1 and filter circuit Cdd rectifying and wave-filtering; This power controller is by the voltage of detection VDD pin and GND pin, and the electric current of the external feedback resistance R _ f b that flows through is realized constant current constant voltage control;
One constant current constant voltage power controller comprises primary inductance switch control pin GATE, a power pin VDD and a ground pin GND; Described GND pin meets a resistance R S, and described GATE pin, GND pin connect a switch transistor T 1; Described power controller further comprises voltage difference detection module, voltage clamp module, constant voltage control module, constant current control module, driving stage module; Described voltage difference detection module connects VDD pin, GND pin, detects the voltage difference between VDD pin, GND pin when detecting described switch transistor T 1 turn-on and turn-off; When described voltage clamp module was turn-offed in described switch transistor T 1, the voltage of clamper GATE pin made it less than described switch transistor T 1 on state threshold voltage, detects the electric current that flows into the GATE pin simultaneously.
As a preferred embodiment of the present invention, described power controller comprises overcurrent protection module OCP, Logic control module, voltage clamp module, output voltage sampling module, demagnetization detection module; Overcurrent protection module detects the voltage difference between VDD pin, GND pin when detecting described switch transistor T 1 turn-on and turn-off, and the voltage difference the when voltage difference between switch transistor T 1 conducting VDD pin, GND pin and switch transistor T 1 turn-offed between VDD pin, GND pin, the difference between these two voltage differences produce the overcurrent protection signal during greater than set point; Logic control module is in order to the switching of control constant voltage control model and constant current control model; And produce control signal and via the turn-on and turn-off of driving stage control switch pipe T1; The voltage clamp module is in order to when switch transistor T 1 is turn-offed, and the voltage of clamper GATE pin makes it less than described switch transistor T 1 on state threshold voltage, detects the electric current that flows into the GATE pin simultaneously; The output voltage sampling module is in order to the sampling secondary output voltage; The demagnetization detection module is in order to detect the demagnetization pulsewidth of transformer secondary output inductance; Described overcurrent protection module, Logic control module, driving stage module connect successively; Described constant voltage control module, constant current control module are connected with Logic control module respectively; The voltage clamp module is connected with output voltage sampling module, demagnetization detection module respectively, and the output voltage sampling module is connected with the constant voltage control module, and the demagnetization detection module is connected with constant current control module, output voltage sampling module respectively.
As a preferred embodiment of the present invention, described overcurrent protection module comprises amplifier feedback unit, K switch 1, comparator C 1, capacitor C vdd; An input of described amplifier feedback unit is the threshold voltage Vref of overcurrent protection module OCP in succession, and another input connects its output, and the output of amplifier feedback unit connects K switch 1; The end of described capacitor C vdd connects the VDD pin, and the other end connects K switch 1; One input of described comparator C 1 connects K switch 1, and another input connects the GND pin; Threshold voltage Vref is sampled and remains on the capacitor C vdd by amplifier feedback unit and K switch 1; The control signal of K switch 1 is PFM signal or pwm signal, depends on that system's CC pattern is to adopt PFM control or PWM control; When PFM signal or pwm signal on-off switching tube T1, the voltage difference of threshold voltage Vref and VDD pin is sampled and remains on the Cvdd; After PFM or pwm signal were opened switch transistor T 1, the current value of former limit inductance Np increased gradually; When the current value of former limit inductance Np greater than Vref/Rs, the voltage of GND pin is also greater than Vref, comparator C 1 upset this moment, thereby on-off switching tube T1; The voltage of described GND pin is the voltage of Rs, has also represented the current value of former limit inductance Np.
As a preferred embodiment of the present invention, described demagnetization detection module comprises voltage clamp module, current-to-voltage converting circuit, demagnetization pulse width signal generation module; The two-way output of described voltage clamp module inputs to current-to-voltage converting circuit, demagnetization pulse width signal generation module respectively; The voltage clamp module connects the GATE pin by a K switch 11; Current-to-voltage converting circuit connects the constant voltage control module, and demagnetization pulse width signal generation module connects the constant current control module, and the output signal of constant voltage control module, constant current control module inputs to Logic control module; The output signal of Logic control module inputs to demagnetization pulse width signal generation module, driving stage module respectively; The output signal of demagnetization pulse width signal generation module connects K switch 11; The voltage clamp module is vised GATE voltage after demagnetization pulse width signal generation module is opened K switch 11, make it to be lower than the threshold voltage of switch transistor T 1, sampling simultaneously flows into the electric current of GATE, its mirror image is output as output current Iout1 and output current Iout2, wherein output current Iout1 offers the constant voltage control module after changing through current-to-voltage converting circuit, output current Iout2 and PFM or pwm signal produce demagnetization pulse width signal DEM together, demagnetization pulse width signal DEM sends into the constant current control module on the one hand, on the other hand the turn-on and turn-off of control switch K11; The output of constant voltage control module, constant current control module is delivered to the driving stage module through generation PFM or pwm signal after the logical operation.
As a preferred embodiment of the present invention, described voltage clamp module is transistor M1, transistor M1 also is connected with transistor M2, transistor M3, transistor M2 connects transistor M4, transistor M5, transistor M3 connects an input of a current comparator, and the output of this current comparator connects a demagnetization logical circuit; The end of transistor M5 connects the constant voltage control module, reaches a capacitor C 1 by a K switch 21 simultaneously by resistance R 1 ground connection, an end ground connection of capacitor C 1, and K switch 21 can be by sampled signal sample control; Magnetic pulse width signal DEM input sample signal generating circuit, sampled signal produce circuit described sampled signal sample of output before the demagnetization pulsewidth finishes; After being triggered, described demagnetization pulse width signal DEM opens K switch 11, detect the electric current of the GATE end of flowing through by transistor M1 and K switch 11, then this electric current is delivered to current comparator by transistor M3 mirror image, after electric current is less than certain threshold value, again with upset of demagnetization pulse width signal DEM signal and stopcock K11, the width of demagnetization pulse width signal DEM signal has been represented the time of transformer demagnetization, and this pulse width information is used for carrying out constant current control; Simultaneously, in this demagnetization pulsewidth, by transistor M1, M2, M4, M5 and resistance R 1, convert the output current information that samples to information of voltage, and before the demagnetization pulsewidth finishes, it is stored on the capacitor C 1, the information of output voltage before on behalf of the transformer demagnetization, this voltage finish, this information is used for carrying out constant voltage control.
A kind of encapsulation of power controller, the pin of this power controller only are three: power pin VDD, switch control pin GATE, pin GND; Described GND pin meets a resistance R S, and described GATE pin, GND pin connect a switch transistor T 1; Power pin VDD connects power supply.
Beneficial effect of the present invention is: the invention provides a kind of three-prong encapsulation constant-current constant-voltage controller that possesses pin multiplexing, can reduce the anti exciting converter system cost, in addition, also provide a kind of method of pin multiplexing, can reduce the cost of the control chip of anti exciting converter greatly.And the ground of controller and former limit inductive current sampling pin has carried out multiplexing, detects the interference of the spike of resistance R S generation to controller at primary current in the time of can effectively avoiding the firm conducting of switch transistor T 1.
Description of drawings
Fig. 1 uses schematic diagram for traditional isolated anti exciting converter that can be applied in the charger occasion.
Fig. 2 is the converter current voltage curve of output schematic diagram among Fig. 1.
Fig. 3 is a signal waveforms in the next switch periods of DCM pattern.
Fig. 4 is the application schematic diagram of LNK632 chip.
Fig. 5 is the application schematic diagram of ACT35 chip.
Fig. 6 is the circuit diagram of supply convertor in one embodiment of the invention.
Fig. 7 is the circuit diagram of power controller in one embodiment of the invention.
Fig. 8 is the circuit diagram of the former limit modulation of three-prong constant current constant voltage power controller in one embodiment of the invention.
Fig. 9 is the circuit diagram of limit, one embodiment of the invention Central Plains overcurrent protection module.
Figure 10 is the sequential schematic diagram of overcurrent protection module among Fig. 9.
Secondary voltage detected and implements schematic diagram when Figure 11 was demagnetization pulsewidth Tdem detection and demagnetization.
Figure 12 is the circuit diagram of demagnetization pulsewidth detection module.
Embodiment
Describe the preferred embodiments of the present invention in detail below in conjunction with accompanying drawing.
Embodiment one
The present invention has disclosed a kind of three-prong encapsulation constant-current constant-voltage controller that possesses pin multiplexing, can reduce the anti exciting converter system cost, in addition, also provides a kind of method of pin multiplexing, can reduce the cost of the control chip of anti exciting converter greatly.
See also Fig. 7, the constant current constant voltage power controller that the present invention discloses comprise three pin: power pin VDD, switch control pin GATE, pin GND.Described GND pin meets a resistance R S, and described GATE pin, GND pin connect a switch transistor T 1.In the present embodiment, the pin of power controller only is three, and certainly, its number of pins can also be for more than three.
Described power controller further comprises voltage difference detection module, inferior utmost point detection module, constant pressure and flow control module, driving stage module; Described voltage difference detection module connects VDD pin, GND pin, detects the voltage difference between VDD pin, GND pin when detecting described switch transistor T 1 turn-on and turn-off; Described utmost point detection module is when described switch transistor T 1 is turn-offed, and the voltage of clamper GATE pin makes it less than described switch transistor T 1 on state threshold voltage, detects the electric current that flows into the GATE pin simultaneously, and then detects time utmost point output voltage and secondary demagnetization pulsewidth.
Described constant pressure and flow control module comprises the part of constant voltage control module, constant current control module, Logic control module, overcurrent protection module OCP.
Described time utmost point detection module comprises voltage clamp module, output voltage sampling module, demagnetization detection module.
Particularly, see also Fig. 8, described power controller comprises overcurrent protection module OCP, constant voltage control module, constant current control module, Logic control module, voltage clamp module, output voltage sampling module, demagnetization detection module.
Overcurrent protection module detects the voltage difference between VDD pin, GND pin when detecting described switch transistor T 1 turn-on and turn-off; and the voltage difference the when voltage difference between switch transistor T 1 conducting VDD pin, GND pin and switch transistor T 1 turn-offed between VDD pin, GND pin, the difference between these two voltage differences produce the overcurrent protection signal during greater than set point.Logic control module is in order to the switching of control constant voltage control model and constant current control model; And produce control signal and, and receive the overcurrent protection signal after by driving stage on-off switching tube T1 via the turn-on and turn-off of driving stage control switch pipe T1.The voltage clamp module is in order to when switch transistor T 1 is turn-offed, and the voltage of clamper GATE pin makes it less than described switch transistor T 1 on state threshold voltage, detects the electric current that flows into the GATE pin simultaneously.The output voltage sampling module is in order to the sampling secondary output voltage.The demagnetization detection module is in order to detect the demagnetization pulsewidth of transformer secondary output inductance.
Described overcurrent protection module, Logic control module, driving stage module connect successively; Described constant voltage control module, constant current control module are connected with Logic control module respectively; The voltage clamp module is connected with output voltage sampling module, demagnetization detection module respectively, and the output voltage sampling module is connected with the constant voltage control module, and the demagnetization detection module is connected with constant current control module, output voltage sampling module respectively.
See also Fig. 9, described overcurrent protection module comprises amplifier feedback unit, K switch 1, comparator C 1, capacitor C vdd; An input of described amplifier feedback unit is the threshold voltage Vref of overcurrent protection module OCP in succession, and another input connects its output, and the output of amplifier feedback unit connects K switch 1; The end of described capacitor C vdd connects the VDD pin, and the other end connects K switch 1; One input of described comparator C 1 connects K switch 1, and another input connects the GND pin; Threshold voltage Vref is sampled and remains on the capacitor C vdd by amplifier feedback unit and K switch 1; The control signal of K switch 1 is PFM signal or pwm signal, depends on that system's CC pattern is to adopt PFM control or PWM control; When PFM signal or pwm signal on-off switching tube T1, the voltage difference of threshold voltage Vref and VDD pin is sampled and remains on the Cvdd; After PFM or pwm signal were opened switch transistor T 1, the current value of former limit inductance Np increased gradually; When the current value of former limit inductance Np greater than Vref/Rs, the voltage of GND pin is also greater than Vref, comparator C 1 upset this moment, thereby on-off switching tube T1; The voltage of described GND pin is the voltage of Rs, has also represented the current value of former limit inductance Np.Concrete sequential is shown in Figure 10.
See also Figure 11, described demagnetization detection module comprises voltage clamp module, current-to-voltage converting circuit, demagnetization pulse width signal generation module; The two-way output of described voltage clamp module inputs to current-to-voltage converting circuit, demagnetization pulse width signal generation module respectively; The voltage clamp module connects the GATE pin by a K switch 11; Current-to-voltage converting circuit connects the constant voltage control module, and demagnetization pulse width signal generation module connects the constant current control module, and the output signal of constant voltage control module, constant current control module inputs to Logic control module; The output signal of Logic control module inputs to demagnetization pulse width signal generation module, driving stage module respectively; The output signal of demagnetization pulse width signal generation module connects K switch 11; The voltage clamp module is vised GATE voltage after demagnetization pulse width signal generation module is opened K switch 11, make it to be lower than the threshold voltage of switch transistor T 1, sampling simultaneously flows into the electric current of GATE, its mirror image is output as output current Iout1 and output current Iout2, wherein output current Iout1 offers the constant voltage control module after changing through current-to-voltage converting circuit, output current Iout2 and PFM or pwm signal produce demagnetization pulse width signal DEM together, demagnetization pulse width signal DEM sends into the constant current control module on the one hand, on the other hand the turn-on and turn-off of control switch K11; The output of constant voltage control module, constant current control module is delivered to the driving stage module through generation PFM or pwm signal after the logical operation.
See also Figure 12, described voltage clamp module is transistor M1, and transistor M1 also is connected with transistor M2, transistor M3, and transistor M2 connects transistor M4, transistor M5, transistor M3 connects an input of a current comparator, and the output of this current comparator connects a demagnetization logical circuit; The end of transistor M5 connects the constant voltage control module, reaches a capacitor C 1 by a K switch 21 simultaneously by resistance R 1 ground connection, an end ground connection of capacitor C 1, and K switch 21 can be by sampled signal sample control; Magnetic pulse width signal DEM input sample signal generating circuit, sampled signal produce circuit described sampled signal sample of output before the demagnetization pulsewidth finishes; After being triggered, described demagnetization pulse width signal DEM opens K switch 11, detect the electric current of the GATE end of flowing through by transistor M1 and K switch 11, then this electric current is delivered to current comparator by transistor M3 mirror image, after electric current is less than certain threshold value, again with upset of demagnetization pulse width signal DEM signal and stopcock K11, the width of demagnetization pulse width signal DEM signal has been represented the time of transformer demagnetization, and this pulse width information is used for carrying out constant current control; Simultaneously, in this demagnetization pulsewidth, by transistor M1, M2, M4, M5 and resistance R 1, convert the output current information that samples to information of voltage, and before the demagnetization pulsewidth finishes, it is stored on the capacitor C 1, the information of output voltage before on behalf of the transformer demagnetization, this voltage finish, this information is used for carrying out constant voltage control.
More than introduced constant current constant voltage power controller of the present invention, the present invention also discloses a kind of supply convertor when disclosing constant current constant voltage power controller, and this supply convertor comprises above-mentioned constant current constant voltage power controller.
See also Fig. 6, supply convertor of the present invention comprises a primary inductance Np, an auxiliary induction Naux (with the mutual magnetic coupling of described primary inductance Np), a level inductance Ns (with the mutual magnetic coupling of described primary inductance Np), a switch transistor T 1, a constant current constant voltage power controller.
The grid of switch transistor T 1 or base stage are received the switch control pin GATE of constant current constant voltage power controller, the source class of this switch transistor T 1 or emitter by one externally current sense resistor Rs receive the ground of supply convertor preliminary survey, the voltage on this current sense resistor Rs is received the ground pin GND of constant current constant voltage power controller simultaneously; The grid of this switch transistor T 1 or base stage are connected to the signal end of auxiliary induction Naux by an external feedback resistance R _ f b; The signal end of this auxiliary induction Naux offers the power controller power supply after by a diode D1 and filter circuit Cdd rectifying and wave-filtering; This power controller is by the voltage of detection VDD pin and GND pin, and the electric current of the external feedback resistance R _ f b that flows through is realized constant current constant voltage control.
Described constant current constant voltage power controller comprises primary inductance switch control pin GATE, a power pin VDD and a ground pin GND; Described GND pin meets a resistance R S, and described GATE pin, GND pin connect a switch transistor T 1; Described power controller further comprises voltage difference detection module, voltage clamp module, constant voltage control module, constant current control module, driving stage module; Described voltage difference detection module connects VDD pin, GND pin, detects the voltage difference between VDD pin, GND pin when detecting described switch transistor T 1 turn-on and turn-off; When described voltage clamp module was turn-offed in described switch transistor T 1, the voltage of clamper GATE pin made it less than described switch transistor T 1 on state threshold voltage, detects the electric current that flows into the GATE pin simultaneously.The specific implementation of constant current constant voltage power controller has detailed description before, does not give unnecessary details at this.
The present invention discloses a kind of encapsulation of power controller simultaneously, and the pin of this power controller only is three: power pin VDD, switch control pin GATE, pin GND; Described GND pin meets a resistance R S, and described GATE pin, GND pin connect a switch transistor T 1; Power pin VDD connects power supply.
In sum, the present invention propose the three-prong encapsulation constant-current constant-voltage controller that possesses pin multiplexing, can reduce the anti exciting converter system cost, in addition, also provide a kind of method of pin multiplexing, can reduce the cost of the control chip of anti exciting converter greatly.And the ground of controller and former limit inductive current sampling pin has carried out multiplexing, detects the interference of the spike of resistance R S generation to controller at primary current in the time of can effectively avoiding the firm conducting of switch transistor T 1.
Embodiment two
In the present embodiment, disclose a kind of encapsulating structure of integrated circuit, a kind of novelty supply convertor, can be used for supply convertor constant pressure and flow power controller.
A kind of integrated circuit encapsulation, it comprises: a power port VDD, the entire controller integrated circuit obtains power supply by this port; A switch port GATE is coupled to inductance switch, and in one embodiment of the present of invention, this switch is the external power metal-oxide-semiconductor, and in another embodiment, this switch is a pliotron; With a ground port GND, the entire controller integrated circuit is by this port ground connection.Whole integrated circuit encapsulation is except above-mentioned power port, and switch port outside the ground port, no longer comprises other port.
In addition, the present invention also provides a kind of supply convertor, and as shown in Figure 6, this supply convertor comprises: a primary inductance Np; An auxiliary induction Naux, and with the mutual magnetic coupling of primary inductance; A secondary inductance Ns, and with the mutual magnetic coupling of primary inductance; A controller IC comprises a primary inductance switch control pin GATE, a power pin VDD and a ground pin GND; An external power switch transistor T 1, the grid of this power switch pipe or base stage (are received the switch port GATE of controller IC, the source class of this power switch pipe or emitter by one externally current sense resistor Rs receive the first ground of surveying of system, the voltage on this current sense resistor Rs is received the ground port of controller IC simultaneously.The grid of this power switch pipe pipe or base stage are connected to the signal end of auxiliary induction Naux by a non-essential resistance Rfb.The signal end Naux of this auxiliary induction offers the power controller power supply after by a diode D1 and Cdd rectifying and wave-filtering.This power controller is by the voltage of detection VDD pin and GND pin, and the electric current of the Rfb that flows through is realized CC/CV control.
In Fig. 6, Rst is a system start-up resistance, and C1 is a filter capacitor behind the line input voltage bridge rectifier.
The present invention utilizes switch port by providing, and power port and three pins of ground port have just been realized all functions of eight pins of original needs or six pins or four pins, therefore provide cost savings.Power switch pipe of the present invention in addition is external, the power current-limiting resistance also is external, do not exist power switch pipe to cause the situation of chip heating so on the one hand, the current limliting of primary current can be very accurate on the other hand (is the external perimysium reference power resistor because detect resistance), also increased simultaneously the flexibility of CC, because can set the size of CC electric current flexibly by changing non-essential resistance.
According to the inner schematic diagram of the power controller of one embodiment of the present of invention as shown in Figure 7.
Fig. 8 has shown the module diagram according to an embodiment of the former limit modulation of three-prong of the present invention constant pressure and flow power controller.This embodiment inside comprises overcurrent protection module (OCP); demagnetization detection module (DemPulse detector); output voltage detection module (Vout sample); constant voltage control module (CVcontrol), constant current control module (CC control), driving stage (Gate driver); chip power supply system (House keeping); reference voltage current module (Reference), and Logic control module (Control logic), as shown in Figure 8.
Fig. 9 has shown the simple embodiment of the former limit overcurrent protection (OCP, Over CurrentProtection) according to one embodiment of the invention, and in a lot of former limit modulation CC/CV control models, this OCP protection is used for controlling CC current point (being the I_cc among Fig. 2).
In Fig. 9, the OCP threshold voltage of Vref for setting is sampled and remains on the capacitor C vdd by amplifier feedback and K switch 1, and the control signal of K1 is PFM signal or pwm signal, depends on that system's CC pattern is to adopt PFM control or PWM control.When PFM signal or pwm signal shutoff external power switching tube (T1 among Fig. 6), Vref and vdd voltage difference are sampled and remain on the Cvdd, when then coming PFM or pwm signal to open the external power switching tube, GND voltage (is the voltage of Rs among Fig. 6, also promptly represented the current value of former limit inductance Np), when this electric current reaches Vref/Rs, comparator C 1 upset, thereby turn-off the external power switching tube, concrete sequential is shown in Figure 10.
In Fig. 9 embodiment, because sampling maintenance effect and current sense resistor are external, thus can realize accurate OCP, and then realize accurate CC point.Owing to external current sense resistor precision height, temperature coefficient is good, makes chip internal not need to do the correction standard resistor again simultaneously, does not also have the heating situation among Fig. 4 and Fig. 5 simultaneously.External in addition current sense resistor can make the CC point outsidely change, and has increased system design flexibility greatly.
Figure 11 shown that demagnetization (Demagnetization) the pulsewidth Tdem according to one embodiment of the invention detects and during demagnetization secondary voltage detect and implement schematic diagram.In the drawings, clamp circuit vises GATE voltage after demagnetization pulsewidth DEM device is opened K switch 11, make it to be lower than the threshold voltage of external power switching tube, sampling simultaneously flows into the electric current of GATE by external feedback resistance R _ f b, its mirror image is output as Iout1 and Iout2, wherein Iout1 offers the CV control module after changing through a current/voltage, Iout2 and PFM or pwm signal produce demagnetization pulse width signal DEM together, DEM sends into the CC controller on the one hand, controls the turn-on and turn-off of K11 on the other hand.The output of CV controller and CC controller is delivered to driving stage through generation PFM or pwm signal after the logical operation.As shown in figure 11.
Figure 12 has shown the specific embodiment of Figure 11.In Figure 12, GATE turn-offs the back clamper and is finished by transistor M1, and the threshold voltage of M1 is lower than external power pipe threshold voltage.In an embodiment shown in Figure 12, the generation of DEM signal is triggered by PFM or the pwm signal that power controller inside outputs to driving stage (shown in Figure 8), after being triggered, opens the DEM signal K switch 11, detect the electric current (by clamp transistor M1) of the GATE end of flowing through by K switch 11, then this electric current is delivered to current comparator by the M3 mirror image, after electric current is less than certain threshold value (being Ith_dem among the figure), again with upset of DEM signal and shutoff K11, the width of DEM signal has been represented the time of transformer demagnetization like this, and this pulse width information is used for carrying out CC control.Simultaneously, in this demagnetization pulsewidth, by M1, M2, M4, M5 and R1, convert the output current information that samples to information of voltage, and before the demagnetization pulsewidth finishes, it is stored on the capacitor C 1, the information of output voltage before on behalf of the transformer demagnetization, this voltage finish, this information is used for carrying out CV control.In specific embodiment, CV control can adopt PFM control also can adopt PWM control.
Here description of the invention and application is illustrative, is not to want with scope restriction of the present invention in the above-described embodiments.Here the distortion of disclosed embodiment and change are possible, and the various parts of the replacement of embodiment and equivalence are known for those those of ordinary skill in the art.Those skilled in the art are noted that under the situation that does not break away from spirit of the present invention or substantive characteristics, and the present invention can be with other form, structure, layout, ratio, and realize with other assembly, material and parts.Under the situation that does not break away from the scope of the invention and spirit, can carry out other distortion and change here to disclosed embodiment.
Claims (11)
1, a kind of constant current constant voltage power controller is characterized in that, this power controller comprise three pin: power pin VDD, switch control pin GATE, pin GND; Described GND pin meets a resistance R S, and described GATE pin, GND pin connect a switch transistor T 1;
Described power controller further comprises voltage difference detection module, inferior utmost point detection module, constant pressure and flow control module, driving stage module;
Described voltage difference detection module connects VDD pin, GND pin, detects the voltage difference between VDD pin, GND pin when detecting described switch transistor T 1 turn-on and turn-off;
Described utmost point detection module is when described switch transistor T 1 is turn-offed, and the voltage of clamper GATE pin makes it less than described switch transistor T 1 on state threshold voltage, detects the electric current that flows into the GATE pin simultaneously, and then detects time utmost point output voltage and secondary demagnetization pulsewidth.
2, constant current constant voltage power controller according to claim 1 is characterized in that:
Described power controller comprises overcurrent protection module OCP, constant voltage control module, constant current control module, Logic control module, voltage clamp module, output voltage sampling module, demagnetization detection module;
Overcurrent protection module detects the voltage difference between VDD pin, GND pin when detecting described switch transistor T 1 turn-on and turn-off, and the voltage difference the when voltage difference between switch transistor T 1 conducting VDD pin, GND pin and switch transistor T 1 turn-offed between VDD pin, GND pin, the difference between these two voltage differences produce the overcurrent protection signal during greater than set point;
Logic control module is in order to the switching of control constant voltage control model and constant current control model; And produce control signal and, and receive the overcurrent protection signal after by driving stage on-off switching tube T1 via the turn-on and turn-off of driving stage control switch pipe T1;
The voltage clamp module is in order to when switch transistor T 1 is turn-offed, and the voltage of clamper GATE pin makes it less than described switch transistor T 1 on state threshold voltage, detects the electric current that flows into the GATE pin simultaneously;
The output voltage sampling module is in order to the sampling secondary output voltage;
The demagnetization detection module is in order to detect the demagnetization pulsewidth of transformer secondary output inductance;
Described overcurrent protection module, Logic control module, driving stage module connect successively;
Described constant voltage control module, constant current control module are connected with Logic control module respectively; The voltage clamp module is connected with output voltage sampling module, demagnetization detection module respectively, and the output voltage sampling module is connected with the constant voltage control module, and the demagnetization detection module is connected with constant current control module, output voltage sampling module respectively.
3, constant current constant voltage power controller according to claim 2 is characterized in that:
Described overcurrent protection module comprises amplifier feedback unit, K switch 1, comparator C 1, capacitor C vdd; An input of described amplifier feedback unit is the threshold voltage Vref of overcurrent protection module OCP in succession, and another input connects its output, and the output of amplifier feedback unit connects K switch 1;
The end of described capacitor C vdd connects the VDD pin, and the other end connects K switch 1;
One input of described comparator C 1 connects K switch 1, and another input connects the GND pin;
Threshold voltage Vref is sampled and remains on the capacitor C vdd by amplifier feedback unit and K switch 1;
The control signal of K switch 1 is PFM signal or pwm signal, depends on that system's CC pattern is to adopt PFM control or PWM control;
When PFM signal or pwm signal on-off switching tube T1, the voltage difference of threshold voltage Vref and VDD pin is sampled and remains on the Cvdd; After PFM or pwm signal were opened switch transistor T 1, the current value of former limit inductance Np increased gradually;
When the current value of former limit inductance Np greater than Vref/Rs, the voltage of GND pin is also greater than Vref, comparator C 1 upset this moment, thereby on-off switching tube T1; The voltage of described GND pin is the voltage of Rs, has also represented the current value of former limit inductance Np.
4, constant current constant voltage power controller according to claim 2 is characterized in that:
Described demagnetization detection module comprises voltage clamp module, current-to-voltage converting circuit, demagnetization pulse width signal generation module;
The two-way output of described voltage clamp module inputs to current-to-voltage converting circuit, demagnetization pulse width signal generation module respectively; The voltage clamp module connects the GATE pin by a K switch 11;
Current-to-voltage converting circuit connects the constant voltage control module, and demagnetization pulse width signal generation module connects the constant current control module, and the output signal of constant voltage control module, constant current control module inputs to Logic control module;
The output signal of Logic control module inputs to demagnetization pulse width signal generation module, driving stage module respectively;
The output signal of demagnetization pulse width signal generation module connects K switch 11;
The voltage clamp module is vised GATE voltage after demagnetization pulse width signal generation module is opened K switch 11, make it to be lower than the threshold voltage of switch transistor T 1, sampling simultaneously flows into the electric current of GATE, its mirror image is output as output current Iout1 and output current Iout2, wherein output current Iout1 offers the constant voltage control module after changing through current-to-voltage converting circuit, output current Iout2 and PFM or pwm signal produce demagnetization pulse width signal DEM together, demagnetization pulse width signal DEM sends into the constant current control module on the one hand, on the other hand the turn-on and turn-off of control switch K11;
The output of constant voltage control module, constant current control module is delivered to the driving stage module through generation PFM or pwm signal after the logical operation.
5, constant current constant voltage power controller according to claim 4 is characterized in that:
Described voltage clamp module is transistor M1, transistor M1 also is connected with transistor M2, transistor M3, transistor M2 connects transistor M4, transistor M5, and transistor M3 connects an input of a current comparator, and the output of this current comparator connects a demagnetization logical circuit;
The end of transistor M5 connects the constant voltage control module, reaches a capacitor C 1 by a K switch 21 simultaneously by resistance R 1 ground connection, an end ground connection of capacitor C 1, and K switch 21 can be by sampled signal sample control;
Magnetic pulse width signal DEM input sample signal generating circuit, sampled signal produce circuit described sampled signal sample of output before the demagnetization pulsewidth finishes;
After being triggered, described demagnetization pulse width signal DEM opens K switch 11, detect the electric current of the GATE end of flowing through by transistor M1 and K switch 11, then this electric current is delivered to current comparator by transistor M3 mirror image, after electric current is less than certain threshold value, again with upset of demagnetization pulse width signal DEM signal and stopcock K11, the width of demagnetization pulse width signal DEM signal has been represented the time of transformer demagnetization, and this pulse width information is used for carrying out constant current control;
Simultaneously, in this demagnetization pulsewidth, by transistor M1, M2, M4, M5 and resistance R 1, convert the output current information that samples to information of voltage, and before the demagnetization pulsewidth finishes, it is stored on the capacitor C 1, the information of output voltage before on behalf of the transformer demagnetization, this voltage finish, this information is used for carrying out constant voltage control.
6, a kind of supply convertor is characterized in that, this supply convertor comprises
One primary inductance Np;
One auxiliary induction Naux is with the mutual magnetic coupling of described primary inductance Np;
A level inductance Ns is with the mutual magnetic coupling of described primary inductance Np;
One switch transistor T 1, the grid of this switch transistor T 1 or base stage are received the switch control pin GATE of constant current constant voltage power controller, the source class of this switch transistor T 1 or emitter by one externally current sense resistor Rs receive the ground of supply convertor preliminary survey, the voltage on this current sense resistor Rs is received the ground pin GND of constant current constant voltage power controller simultaneously; The grid of this switch transistor T 1 or base stage are connected to the signal end of auxiliary induction Naux by an external feedback resistance R _ f b; The signal end of this auxiliary induction Naux offers the power controller power supply after by a diode D1 and filter circuit Cdd rectifying and wave-filtering; This power controller is by the voltage of detection VDD pin and GND pin, and the electric current of the external feedback resistance R _ f b that flows through is realized constant current constant voltage control;
One constant current constant voltage power controller comprises primary inductance switch control pin GATE, a power pin VDD and a ground pin GND; Described GND pin meets a resistance R S, and described GATE pin, GND pin connect a switch transistor T 1; Described power controller further comprises voltage difference detection module, voltage clamp module, constant voltage control module, constant current control module, driving stage module; Described voltage difference detection module connects VDD pin, GND pin, detects the voltage difference between VDD pin, GND pin when detecting described switch transistor T 1 turn-on and turn-off; When described voltage clamp module was turn-offed in described switch transistor T 1, the voltage of clamper GATE pin made it less than described switch transistor T 1 on state threshold voltage, detects the electric current that flows into the GATE pin simultaneously.
7, supply convertor according to claim 6 is characterized in that:
Described power controller comprises overcurrent protection module OCP, Logic control module, voltage clamp module, output voltage sampling module, demagnetization detection module;
Overcurrent protection module detects the voltage difference between VDD pin, GND pin when detecting described switch transistor T 1 turn-on and turn-off, and the voltage difference the when voltage difference between switch transistor T 1 conducting VDD pin, GND pin and switch transistor T 1 turn-offed between VDD pin, GND pin, the difference between these two voltage differences produce the overcurrent protection signal during greater than set point;
Logic control module is in order to the switching of control constant voltage control model and constant current control model; And produce control signal and via the turn-on and turn-off of driving stage control switch pipe T1;
The voltage clamp module is in order to when switch transistor T 1 is turn-offed, and the voltage of clamper GATE pin makes it less than described switch transistor T 1 on state threshold voltage, detects the electric current that flows into the GATE pin simultaneously;
The output voltage sampling module is in order to the sampling secondary output voltage;
The demagnetization detection module is in order to detect the demagnetization pulsewidth of transformer secondary output inductance;
Described overcurrent protection module, Logic control module, driving stage module connect successively;
Described constant voltage control module, constant current control module are connected with Logic control module respectively; The voltage clamp module is connected with output voltage sampling module, demagnetization detection module respectively, and the output voltage sampling module is connected with the constant voltage control module, and the demagnetization detection module is connected with constant current control module, output voltage sampling module respectively.
8, supply convertor according to claim 7 is characterized in that:
Described overcurrent protection module comprises amplifier feedback unit, K switch 1, comparator C 1, capacitor C vdd;
An input of described amplifier feedback unit is the threshold voltage Vref of overcurrent protection module OCP in succession, and another input connects its output, and the output of amplifier feedback unit connects K switch 1;
The end of described capacitor C vdd connects the VDD pin, and the other end connects K switch 1;
One input of described comparator C 1 connects K switch 1, and another input connects the GND pin;
Threshold voltage Vref is sampled and remains on the capacitor C vdd by amplifier feedback unit and K switch 1;
The control signal of K switch 1 is PFM signal or pwm signal, depends on that system's CC pattern is to adopt PFM control or PWM control;
When PFM signal or pwm signal on-off switching tube T1, the voltage difference of threshold voltage Vref and VDD pin is sampled and remains on the Cvdd; After PFM or pwm signal were opened switch transistor T 1, the current value of former limit inductance Np increased gradually;
When the current value of former limit inductance Np greater than Vref/Rs, the voltage of GND pin is also greater than Vref, comparator C 1 upset this moment, thereby on-off switching tube T1; The voltage of described GND pin is the voltage of Rs, has also represented the current value of former limit inductance Np.
9, supply convertor according to claim 7 is characterized in that:
Described demagnetization detection module comprises voltage clamp module, current-to-voltage converting circuit, demagnetization pulse width signal generation module;
The two-way output of described voltage clamp module inputs to current-to-voltage converting circuit, demagnetization pulse width signal generation module respectively; The voltage clamp module connects the GATE pin by a K switch 11;
Current-to-voltage converting circuit connects the constant voltage control module, and demagnetization pulse width signal generation module connects the constant current control module, and the output signal of constant voltage control module, constant current control module inputs to Logic control module;
The output signal of Logic control module inputs to demagnetization pulse width signal generation module, driving stage module respectively;
The output signal of demagnetization pulse width signal generation module connects K switch 11;
The voltage clamp module is vised GATE voltage after demagnetization pulse width signal generation module is opened K switch 11, make it to be lower than the threshold voltage of switch transistor T 1, sampling simultaneously flows into the electric current of GATE, its mirror image is output as output current Iout1 and output current Iout2, wherein output current Iout1 offers the constant voltage control module after changing through current-to-voltage converting circuit, output current Iout2 and PFM or pwm signal produce demagnetization pulse width signal DEM together, demagnetization pulse width signal DEM sends into the constant current control module on the one hand, on the other hand the turn-on and turn-off of control switch K11;
The output of constant voltage control module, constant current control module is delivered to the driving stage module through generation PFM or pwm signal after the logical operation.
10, supply convertor according to claim 9 is characterized in that:
Described voltage clamp module is transistor M1, transistor M1 also is connected with transistor M2, transistor M3, transistor M2 connects transistor M4, transistor M5, and transistor M3 connects an input of a current comparator, and the output of this current comparator connects a demagnetization logical circuit;
The end of transistor M5 connects the constant voltage control module, reaches a capacitor C 1 by a K switch 21 simultaneously by resistance R 1 ground connection, an end ground connection of capacitor C 1, and K switch 21 can be by sampled signal sample control;
Magnetic pulse width signal DEM input sample signal generating circuit, sampled signal produce circuit described sampled signal sample of output before the demagnetization pulsewidth finishes;
After being triggered, described demagnetization pulse width signal DEM opens K switch 11, detect the electric current of the GATE end of flowing through by transistor M1 and K switch 11, then this electric current is delivered to current comparator by transistor M3 mirror image, after electric current is less than certain threshold value, again with upset of demagnetization pulse width signal DEM signal and stopcock K11, the width of demagnetization pulse width signal DEM signal has been represented the time of transformer demagnetization, and this pulse width information is used for carrying out constant current control;
Simultaneously, in this demagnetization pulsewidth, by transistor M1, M2, M4, M5 and resistance R 1, convert the output current information that samples to information of voltage, and before the demagnetization pulsewidth finishes, it is stored on the capacitor C 1, the information of output voltage before on behalf of the transformer demagnetization, this voltage finish, this information is used for carrying out constant voltage control.
11, a kind of encapsulation of power controller is characterized in that, the pin of this power controller only is three: power pin VDD, switch control pin GATE, pin GND; Described GND pin meets a resistance R S, and described GATE pin, GND pin connect a switch transistor T 1; Power pin VDD connects power supply.
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Inventor after: Yang Yuanyuan Inventor before: Hu Weiming Inventor before: Ye Jun Inventor before: Lin Guanqiu |
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Application publication date: 20100303 |